Vegetable container for refrigerators and refrigerator having the same

<u>CROSS-REFERENCE TO RELATED APPLICATION</u>

0001This application claims the priority benefit of Korean Patent Application No. <patcit id="pcit0001" dnum="KR20130060550"><text>2013-0060550</text></patcit>, No. <patcit id="pcit0002" dnum="KR20130060551"><text>2013-0060551</text></patcit>, No. <patcit id="pcit0003" dnum="KR20130060552"><text>2013-0060552</text></patcit> and No. <patcit id="pcit0004" dnum="KR20130060555"><text>2013-0060555, filed on May 28, 2013</text></patcit> in the Korean Intellectual Property Office.

<u>BACKGROUND OF THE INVENTION</u>

1. Field of the invention

0002The present invention relates to a vegetable container for refrigerators and a refrigerator having the same.

2. Description of the Related Art

0003In general, a refrigerator is an apparatus that stores objects to be stored in a fresh state for a long period of time using cool air supplied into a storage compartment. The cool air supplied into the storage compartment is generated through heat exchange of a refrigerant. The cool air supplied into the storage compartment is uniformly distributed in the storage compartment by convection to store foods at desired temperature.

0004The storage compartment is defined in a main body forming the external appearance of the refrigerator. The storage compartment is open at the front thereof such that foods can be received through the opening. A door to open and close the storage compartment is mounted at the front of the storage compartment. The door is hinged to the main body to open and close the storage compartment.

0005The refrigerator is generally provided with a vegetable container to store vegetables. In a case in which vegetables are stored in the refrigerator, it is necessary to keep the vegetables as fresh as possible. For this reason, it is important to maintain a space in which the vegetables are received under optimal conditions.

0006<patcit id="pcit0005" dnum="KR19990033606A"><text>KR 1999 0033606 A</text></patcit> describes a refrigerator having a drawer with a valve in a bottom thereof.

0007<patcit id="pcit0006" dnum="JP2005351580A"><text>JP 2005 351580 A</text></patcit> discloses a refrigerator including a cooling storage chamber in which a container containing liquid is installed and which is formed with a depressurizable space in the container, and a depressurizing means for depressurizing the space in the container. The depressurizing means is operated for depressurizing the space in the container. <u>Further, the container has a drain hole.</u>

SUMMARY OF THE INVENTION

0008It is an object of the present invention to provide a vegetable container for refrigerators configured such that the interior of the vegetable container can be maintained in a low vacuum state and a refrigerator having the same.

0009It is another object of the present invention to provide a vegetable container for refrigerators configured such that dew formed in the vegetable container cannot be observed by the naked eye, the dew being guided to a water collection part, and a refrigerator having the same.

0010It is a further object of the present invention to provide a vegetable container for refrigerators configured such that dew formed in the vegetable container can be easily discharged and the interior of the vegetable container can be maintained in a low vacuum state and a refrigerator having the same.

0011The objects are solved by the features of the independent claim.

0012In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a vegetable container for refrigerators including a case having an opening formed at a front thereof, the case being provided with a receiving space to receive objects to be stored defined therein, a drawer to hermetically seal an interior of the case, a discharge port formed through a bottom surface of the case to discharge water from the case, a negative pressure part to form vacuum in the case, and an opening and closing valve to open and close the discharge port.

0013The opening and closing valve may be moved to one side by external force such that the opening and closing valve is opened and may be moved to the other side by elastic force such that the opening and closing valve is closed.

0014The discharge port includes a water collection part depressed in a portion of the bottom surface of the case and a discharge part to allow the water collection part to communicate with an outside of the case.

0015The opening and closing valve includes a plug to open and close the discharge part, a head located on the water collection part, a valve shaft connected between the plug and the head, the valve shaft extending through the discharge port, and an elastic spring provided in the discharge port to apply elastic force to movement of the opening and closing valve.

0016In addition, the vegetable container includes a plurality of introduction preventing protrusions disposed around the head such that the introduction preventing pieces are spaced apart from each other, the introduction preventing pieces extending from the head to the water collection part.

0017The introduction preventing protrusions reciprocate in the water collection part during reciprocation of the opening and closing valve.

0018Meanwhile, the opening and closing valve may be moved to one side by contact with the drawer such that the opening and closing valve is opened.

0019In addition, the vegetable container may further include a guide channel formed at an inner surface of the case to guide water formed in the case to the discharge port, wherein the guide channel may include at least two mountain parts protruding toward an inside of the case and at least one valley part disposed between the respective mountain parts, the valley part being depressed toward an outside of the case.

0020Each of the mountain parts may include a base and a first inclined side and a second inclined side extending from opposite ends of the base to form an apex. A length ratio of the base, the first inclined side, and the second inclined side of each of the mountain parts may be 1.4 to 1.6 : 1.9 to 2.1 : 2.36 to 2.64.

0021According to another, not claimed aspect of the present disclosure, the opening and closing valve may be closed by a difference in pressure between an inside and an outside of the case and may be opened when the difference in pressure between the inside and the outside of the case is released.

0022According to this not claimed aspect, the opening and closing valve may include a fixing part having a space, through which water is discharged, defined therein, the fixing part being inserted and fixed in the discharge port, and at least two tight contact lips connected to a lower part of the fixing part such that the tight contact lips can come into tight contact with each other due to the difference in pressure between the inside and the outside of the case.

0023The tight contact lips may come into tight contact with each other to close the opening and closing valve when the pressure inside the case is lower than the pressure outside the case. On the other hand, the tight contact lips may become spaced apart from each other to open the opening and closing valve when the difference in pressure between the inside and the outside of the case is released.

0024The fixing part may include a catching protrusion caught by the discharge port and a distance maintaining part connected to the tight contact lips to maintain a distance between the tight contact lips.

0025The distance maintaining part may have at least two inclined surfaces, a distance between which is gradually decreased from the catching protrusion to the tight contact lips.

0026The tight contact lips may be coupled to lower ends of the inclined surfaces. The tight contact lips may come into surface contact with each other.

BR

IEF DESCRIPTION OF THE DRAWINGS

0027The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: <ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">FIG. 1</figref> is a perspective view showing a refrigerator according to an embodiment of the present invention;</li><li><figref idref="f0002">FIG. 2</figref> is a front view showing a state in which doors of the refrigerator shown in <figref idref="f0001">FIG. 1</figref> are open;</li><li><figref idref="f0003">FIG. 3</figref> is a perspective view showing a vegetable container for refrigerators according to an embodiment of the present invention;</li><li><figref idref="f0004">FIG. 4</figref> is a perspective view showing a state in which the vegetable container according to the embodiment of the present invention is open;</li><li><figref idref="f0005">FIG. 5</figref> is a perspective view showing a case according to an embodiment of the present invention;</li><li><figref idref="f0006">FIG. 6</figref> is a perspective view showing a state in which a reinforcing member is coupled to the case according to the embodiment of the present invention;</li><li><figref idref="f0007">FIG. 7</figref> is a side sectional view of the case according to the embodiment of the present invention;</li><li><figref idref="f0007">FIG. 8</figref> is a front view of the case according to the embodiment of the present invention;</li><li><figref idref="f0008">FIG. 9A</figref> is a partial plan view showing the top surface and the lateral surfaces of the case according to the embodiment of the present invention;</li><li><figref idref="f0009">FIG. 9B</figref> is a partial plan view of the top surface of the case according to the embodiment of the present invention when viewed from the interior of the case;</li><li><figref idref="f0009">FIG. 9C</figref> is a sectional view taken along line I-I of <figref idref="f0008 f0009">FIG. 9</figref>;</li><li><figref idref="f0010">FIG. 10</figref> is a sectional view showing guide channels according to various embodiments of the present invention;</li><li><figref idref="f0011">FIG. 11</figref> is an enlarged sectional view showing part B of <figref idref="f0007">FIG. 7</figref>;</li><li><figref idref="f0012">FIG. 12</figref> is a sectional view showing a state in which an opening and closing valve of <figref idref="f0011">FIG. 11</figref> is open;</li><li><figref idref="f0013">FIG. 13</figref> is a perspective view showing an opening and closing valve according to an embodiment of the present invention;</li><li><figref idref="f0013">FIGS. 14</figref> and <figref idref="f0014">15</figref> are views illustrating operation of the opening and closing valve according to the embodiment of the present invention;</li><li><figref idref="f0015">FIG. 16</figref> is a sectional view showing an opening and closing valve according to another, not claimed embodiment of the present invention;</li><li><figref idref="f0016">FIG. 17</figref> is a sectional view showing a state in which the opening and closing valve of <figref idref="f0015">FIG. 16</figref> is open;</li><li><figref idref="f0017">FIG. 18</figref> is a perspective view showing the opening and closing valve according to the not claimed embodiment of the present invention shown in <figref idref="f0015">FIG. 16</figref>;</li></ul>

<u>DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS</u>

0028Hereinafter, reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings.

0029<figref idref="f0001">FIG. 1</figref> is a perspective view showing a refrigerator according to an embodiment of the present invention and <figref idref="f0002">FIG. 2</figref> is a front view showing a state in which doors of the refrigerator shown in <figref idref="f0001">FIG. 1</figref> are open.

0030As shown in <figref idref="f0001">FIGS. 1</figref> and <figref idref="f0002">2</figref>, the refrigerator according to the embodiment of the present invention includes a main body 2 having storage compartments F and R defined therein, a cooling device 40 to cool the storage compartments F and R, and doors 4 and 6 to open and close the storage compartments F and R, respectively.

0031The cooling device 40 exchange heat with the outside to cool the storage compartments F and R. The cooling device 40 may be constituted by a refrigeration cycle device including a compressor, a condenser, an expansion device, and an evaporator. Alternatively, the cooling device 40 may be constituted by a thermoelectric element including first and second different metals spaced apart from each other such that one of the first and second metals absorbs heat and the other of the first and second metals emits heat. Hereinafter, the cooling device 40 will be described as being constituted by the refrigeration cycle device.

0032The cooling device 40 circulates a refrigerant in order of the compressor -> the condenser -> the expansion device -> the evaporator -> the compressor to cool the storage compartments F and R.

0033The evaporator of the cooling device 40 may be disposed in contact with the outer walls of the storage compartments F and R to directly cool the storage compartments F and R. Alternatively, the cooling device 40 may further include a cool air circulation fan 50 to circulate air in the storage compartments F and R through the evaporator and the storage compartments F and R such that the air in the storage compartments F and R can cool the storage compartments F and R while circulating through the storage compartments F and R and the evaporator.

0034In the storage compartments F and R of the main body 2 may be disposed shelves 8 and 10, on which objects, such as foodstuffs and side dishes, to be stored are placed.

0035In addition, a vegetable container 100 to store vegetables and fruits may be mounted in the storage compartments F and R of the main body 2.

0036The vegetable container 100 may be mounted in the storage compartments F and R such that the vegetable container 100 can be withdrawn from the storage compartments F and R. Alternatively, the vegetable container 100 may be fixedly mounted in the storage compartments F and R.

0037The doors 4 and 6 are mounted at the main body 2 such that the doors 4 and 6 can be hinged in the left and right direction or in the upward and downward direction. A door basket 5 to store drinks such as spring water, milk, juice, and alcoholic beverages or ices such as ice cream is disposed at the side (i.e. the rear) of the doors 4 and 6 which faces the storage compartments F and R when the doors 4 and 6 are closed.

0038A plurality of door baskets 5 may be mounted at the doors 4 and 6 such that the door baskets 5 are vertically spaced apart from each other.

0039The storage compartments F and R may include a freezing compartment F and a refrigerating compartment R. The doors 4 and 6 include a freezing compartment door 4 to open and close the freezing compartment F and a refrigerating compartment door 6 to open and close the refrigerating compartment R. The shelves 8 and 10 may include a freezing compartment shelf 8 disposed in the freezing compartment F and a refrigerating compartment shelf 10 disposed in the refrigerating compartment R. The door basket 5 may be mounted in the freezing compartment F to store objects, such as ice cream, to be frozen or in the refrigerating compartment R to store objects, such as milk, juice, and alcoholic beverages, to be refrigerated.

0040Hereinafter, the vegetable container 100 will be described in detail with reference to the accompanying drawings.

0041<figref idref="f0003">FIG. 3</figref> is a perspective view showing a vegetable container according to an embodiment of the present invention, <figref idref="f0004">FIG. 4</figref> is a perspective view showing a state in which the vegetable container according to the embodiment of the present invention is open, <figref idref="f0005">FIG. 5</figref> is a perspective view showing a case according to an embodiment of the present invention, <figref idref="f0006">FIG. 6</figref> is a perspective view showing a state in which a reinforcing member is coupled to the case according to the embodiment of the present invention, <figref idref="f0007">FIG. 7</figref> is a side sectional view of the case according to the embodiment of the present invention, <figref idref="f0007">FIG. 8</figref> is a front view of the case according to the embodiment of the present invention, <figref idref="f0008">FIG. 9A</figref> is a partial plan view showing the top surface and the lateral surfaces of the case according to the embodiment of the present invention, <figref idref="f0009">FIG. 9B</figref> is a partial plan view of the top surface of the case according to the embodiment of the present invention when viewed from the interior of the case, <figref idref="f0009">FIG. 9C</figref> is a sectional view taken along line I-I of <figref idref="f0008 f0009">FIG. 9</figref>, and <figref idref="f0010">FIG. 10</figref> is a sectional view showing guide channels according to various embodiments of the present invention.

0042Referring to <figref idref="f0003 f0004 f0005 f0006">FIGS. 3 to 6</figref>, the vegetable container 100 includes a case 110, a drawer 120, a discharge port 180, a negative pressure part 190, and an opening and closing valve 170.

0043In addition, the vegetable container 100 may further include guide channels 200a to 200d.

0044The case 110 defines the external appearance of the vegetable container 100. The case 110 is mounted in the storage compartments F and R of the main body 2 of the refrigerator. In addition, the case 110 is configured to have a double structure including an inner case and an outer case. The outer case may be fixed in the storage compartments F and R and the inner case may be mounted in the outer case such that the inner case can be withdrawn from the outer case.

0045The case 110 has an opening 113 formed at the front thereof. In the case 110 is defined a receiving space A to store objects to be stored.

0046For example, the case 110 may be formed in the shape of a rectangular parallelepiped having the receiving space A defined therein. More specifically, only the front (opening 113) of the case 110, through which the drawer 120 is inserted or withdrawn, may be opened and the other five faces of the case 110 may be closed. That is, in <figref idref="f0002">FIG. 2</figref>, the opening 113 is formed at the front of the case 110 and a rear surface 110d is disposed at the rear of the case 110. A top surface 110a and a bottom surface 110c may be disposed at the top and bottom of the case 110 and lateral surfaces 110b may be disposed at opposite sides of the case 110. The top surface 110a and the bottom surface 110c of the case 110 may have larger area than the lateral surfaces 110b of the case 110.

0047The negative pressure part 190 to generate negative pressure (vacuum) in the case 110 may be mounted at one side of the case 110. For example, the negative pressure part 190 may be constituted by a pump (vacuum pump).

0048In addition, although not shown, the negative pressure part 190 may be connected to the case 110 via a connection pipe. When the drawer 120 is inserted into the case 110, therefore, the negative pressure part 190 may discharge air from the case 110 to decompress the case 110.

0049At the edge of the opening 113 may be further formed a flange 119 extending outside the receiving space A. That is, the flange 119 may be formed at the front of the case 110 such that the flange 119 extends outward.

0050The flange 119 may be disposed perpendicularly to the lateral surfaces 110b and the top and bottom surfaces of the case 110. The flange 119 being disposed perpendicularly to the lateral surfaces 110b and the top and bottom surfaces of the case 110 may mean that the flange 119 extends in the vertical direction and in the horizontal direction of the case 110. In addition, the term "perpendicularly" does not mean "completely perpendicularly" in mathematical terms but means "perpendicularly while having an error" in engineering terms.

0051The flange 119 may be disposed perpendicularly the top surface 110a and the bottom surface 110b of the case 110 to prevent the edge of the opening 113 from drooping due to negative pressure generated in the case 110. Specifically, the flange 119 may be formed in the vertical direction of the case 110 to function as a bending stress support to resist bending stress generated at the edge of the opening 113.

0052In addition, the flange 119 provides a region contacting the drawer 120 when the drawer 120 hermetically seals the case 110. Particularly, in a case in which the interior of the case 110 is maintained almost in a vacuum state, it is necessary for the interior of the case 110 to be completely isolated from the outside. Since the flange 119 provides a space which the drawer 120 contacts, the flange 119 improves hermetical sealing performance of the vegetable container 100. In addition, in a case in which a hermetical sealing member 140 is used at a contact area between the drawer 120 and the case 110, the flange 119 may provide a space which the hermetical sealing member 140 contacts.

0053At least one surface of the edge of the opening 113 may be configured to have an arch structure in which the middle portion of the surface of the edge of the opening 113 protrudes outside the receiving space A.

0054For example, as shown in <figref idref="f0005">FIG. 5</figref>, the edge of the opening 113 has a rectangular shape including the top surface 110a, the bottom surface 110c, and the lateral surfaces 110b of the case 110. The top surface 110a and the bottom surface 110c of the case 110 are generally longer than the lateral surfaces 110b of the case 110. As a result, the top surface 110a and the bottom surface 110c of the case 110 are greatly deformed due to bending stress generated by the difference in pressure between the inside and the outside of the case 110. In a case in which one surface (for example, the front end of the top surface 110a of the case 110) of the edge of the opening 113 has an arch structure in which in which the middle portion of the surface of the edge of the opening 113 protrudes outside the receiving space A, therefore, it is possible to effectively resist bending stress applied in the internal direction of the case 110. That is, in a case in which the edge of the opening 113 is designed to have an arch structure, it is possible to prevent the circumference of the opening 113 of the case 110 from being bent inside the case 110.

0055The case 110 may further include a reinforcing rib 111 to increase strength of the case 110.

0056The reinforcing rib 111 is a member formed in the direction in which the case 110 is deformed. The reinforcing rib 111 may be integrally formed with the case 110 by injection molding.

0057For example, the reinforcing rib 111 may be formed at the outer surface of the case 110 to secure the receiving space A in the case 110. In addition, a plurality of reinforcing ribs 111 may be formed in a first direction and a plurality of reinforcing ribs 111 may be further formed in a direction intersecting the first direction.

0058In the inner surface of the case 110 may be formed rails 117 to guide the drawer 120 such that the drawer 120 can be inserted into and withdrawn from the case 110 in a drawer fashion. For example, the rails 117 may be formed at the inner lateral surfaces of the case 1110 such that the rails 117 extend from the front to the rear.

0059The drawer 120 hermetically seals the interior of the case 110. The drawer 120 defines the external appearance of the vegetable container 100 together with the case 110.

0060For example, the drawer 120 may include a receiving part 123 defining a receiving space to receive objects to be stored and a front part 121 disposed at the front of the receiving part 123.

0061The receiving part 123 is inserted into and withdrawn from the case 110 in a drawer fashion. For example, guides 129 corresponding to the rails 117 of the case 110 are formed at the outer surface of the receiving part 123 such that the receiving part 123 can move forward from the case 110 and backward into the case 110 along the rails 117.

0062For example, the receiving part 123 may have a hexahedral shape opened at the top and the front thereof.

0063The front part 121 may be disposed at the front of the receiving part 123. The front part 121 may be formed to have a larger size than the receiving part 123. Consequently, the edge of the front part 121 contacts the edge of the opening 113 to hermetically seal the case 110.

0064The front part 121 may be formed approximately in the shape of a rectangle (rectangular parallelepiped). More specifically, the front part 121 may have a size and a shape corresponding to the size and the shape of the flange 119 of the opening 113. That is, the front part 121 may be formed so as to contact the flange 110 of the case 110.

0065In addition, the front part 121 may be provided with a grip 125 for withdrawal or insertion.

0066The grip 125 may be provided at the upper region of the front part 121.

0067For example, the grip 125 may be depressed toward the rear such that a grip space is formed from the surface of the front part 121.

0068In a case in which the interior of the case 110 is hermetically sealed by the drawer 120, the difference in pressure between the inside and the outside of the case 110 is generated. That is, when the interior of the case 110 is hermetically sealed by the drawer 120, the interior of the case 110 is decompressed by the negative pressure part 190 with the result that the pressure inside the case 110 becomes lower than the pressure outside the case 110.

0069The hermetical sealing member 140 may be provided at a contact region between the front part 121 of the drawer 120 and the edge of the opening 113 to isolate the inside of the case 110 from the outside of the case 110.

0070For example, the hermetical sealing member 140 may be made of a rubber material.

0071The hermetical sealing member 140 may be formed along the edge (or the flange 119) of the opening 113 in a closed loop shape.

0072Between the case 110 and the drawer 120 may be provided a hermetical sealing retention device 160 to retain an isolated state of the inside of the case 110 from the outside of the case 110.

0073For example, the hermetical sealing retention device 160 may include a catching part coupled to one selected from between the drawer 120 and the case 110 and a fastening part coupled to the other selected from between the drawer 120 and the case 110 such that the fastening part can be fastened to the catching part. However, the present invention is not limited thereto. The hermetical sealing retention device 160 may have various structures.

0074Referring to <figref idref="f0005">FIGS. 5</figref>, <figref idref="f0007">7, and 8</figref>, the discharge port 180 is formed at the bottom surface 110c of the case 110 such that water formed in the case 110 is collected at the discharge port 180. Specifically, the discharge port 180 is formed through the bottom surface 110c of the case 110 such that water formed in the case 110 is discharged out of the case 110 through the discharge port 180.

0075The discharge port 180 is positioned lower than the bottom surface 110c of the case 110 such that water formed in the case 110 can be collected at the discharge port 180 due to gravity. The water in the case 110 may be dew formed as the result of saturation of moisture in the case 110 when the temperature in the case 110 is lowered to a dew point or less.

0076More specifically, the bottom surface 110c of the case 110 may be inclined downward toward the discharge port 180 such that water flowing due to gravity can be effectively guided to the discharge port 180.

0077A various number of discharge ports 180 may be provided. In a case in which one discharge port 180 is provided, however, the discharge port 180 may be disposed approximately at the middle portion of the bottom surface 110c of the case 110 for advantageous water collection.

0078In the discharge port 180 may be provided an opening and closing valve 170 to open and close the discharge port 180 so as to control discharge of water collected at the discharge port 180. The opening and closing valve 170 will hereinafter be described in detail.

0079Referring to <figref idref="f0005 f0006 f0007 f0008 f0009 f0010">FIGS. 5 to 10</figref>, the guide channels 200a to 200d are formed at the inner surface of the case 110 to guide water formed in the case 110 to the discharge port 180. In addition, the guide channels 200a to 200d serve to hide dew formed in the case 110 such that the dew cannot be observed by the naked eye.

0080The guide channels 200a to 200d may be formed at at least a portion of the inner surface of the case 110. Of course, the guide channels 200a to 200d may be formed at the entire inner surface of the case 110.

0081The guide channels 200a to 200d may have various shapes.

0082Referring to <figref idref="f0008 f0009">FIG. 9</figref>, the guide channels 200a to 200d may be formed at the inner surface of the case 110 such that the guide channels 200a to 200d can be depressed and protrude to guide water toward the discharge port 180.

0083For example, the guide channels 200a to 200d may include at least two mountain parts 210 protruding toward the inside of the case 110 and at least one valley part 220 disposed between the respective mountain parts 210, the valley part 220 being depressed toward the outside of the case 110.

0084The mountain parts 210 extend in the left and right direction of the case 110. A plurality of mountain parts 210 are repeatedly arranged from the front to the rear of the case 110.

0085The mountain parts 210 are parts extending in one direction in a state in which the mountain parts 210 protrude more than the valley part 220 such that water formed in the case 110 can flow to the valley part 220. The valley part 220 is formed between the respective mountain parts 210 such that the valley part 220 is lower than the mountain parts 210 to provide a water guide channel.

0086In particular, referring to <figref idref="f0010">FIG. 10</figref>, each of the mountain parts 210 may have any one selected from among a triangular shape, a quadrangular shape, and a semicircular shape as a sectional shape. In a case in which the sectional shape of each of the mountain parts 210 is the triangular shape or the semicircular shape, dew formed on the inner surface of the case 110 easily flows to the valley part 220 such that the dew cannot be observed by the naked eye.

0087More specifically, each of the mountain parts 210 may be defined by two inclined sides 211 and 212. That is, each of the mountain parts 210 may have a triangular or quadrangular section having two inclined sides 211 and 212.

0088The mountain parts 210 and the valley parts 220 are alternately arranged from the front to the rear of the case 110. When the temperature in the case 110 is lowered to a dew point or less, moisture in the case 110 may be saturated to form dew. The dew flows from the mountain parts 210 to the valley parts 220 and is stored in the valley parts 220. In particular, the dew does not stay on the protruding mountain parts 210 but moves to the depressed valley parts 220 due to cohesive force of water and adhesive force between the water and the inner surface of the case 110.

0089In addition, when the dew is stored in the valley parts 220 in a state in which the mountain parts 210 and the valley parts 220 are alternately arranged from the front to the rear of the case 110, a user located in front of the case 110 cannot easily see the dew stored in the valley parts 220. That is, visibility is low. This is because the mountain parts 210 extending from the left side to the right side of the case 110 may obstruct the user's field of vision.

0090Specifically, referring to <figref idref="f0009">FIG. 9C</figref>, each of the mountain parts 210 may have an approximately right-angled triangular shape as a sectional shape (taken along a line directed from the front to the rear of the case 110).

0091More specifically, each of the mountain parts 210 may be defined by a first inclined side 211 and a second inclined side 212 extending from opposite ends of a base 213 to form an apex.

0092The base 213 is an arbitrary line interconnecting adjacent valley parts 220.

0093A length ratio (d3 : d1 : d2) of the base 213, the first inclined side 211, and the second inclined side 212 may be 1.4 to 1.6 : 1.9 to 2.1 : 2.36 to 2.64. When a Pythagoras theorem is applied, therefore, each of the mountain parts 210 may have an approximately right-angled triangular shape in which an inner angle defined between the base 213 and the first inclined side 211 is approximately 90 degrees as a sectional shape.

0094The mountain parts 210 and the valley parts 220 are symmetrical with respect to the second inclined side 212.

0095In a case in which the mountain parts 210 and the valley parts 220 are formed in a quadrangular shape, dew formed on the inner surface of the case 110 cannot easily move to the valley parts 220. Consequently, the dew may stay on the mountain parts 210 with the result that the user may observe the dew.

0096In a case in which the mountain parts 210 and the valley parts 220 are formed in a triangular shape, dew formed on the inner surface of the case 110 can easily move to the valley parts 220. In particular, the dew formed on the inner surface of the case 110 has a large contact area between the inner surface of the case 110 between the first inclined side 211 and the second inclined side 212. Such a large contact area improves adhesive force with the dew. As a result, the dew can easily move to the valley part 220.

0097Particularly, in a case in which the mountain parts 210 and the valley parts 220 are formed in a right-angled triangular shape, dew formed on the inner surface of the case 110 can more easily move to the valley parts 220. Specifically, in a case in which an interior angle (an angle between the first inclined side 211 and the second inclined side 212) of each of the valley parts 220 is increased, the dew formed at the apexes of mountain parts 210 cannot easily move to the valley parts 220. On the other hand, in a case in which the interior angle (the angle between the first inclined side 211 and the second inclined side 212) of each of the valley parts 220 is excessively decreased, the height of each of the mountain parts 210 is excessively increased with the result that the strength of the case 110 is lowered and the thickness of the case 110 is increased.

0098In a case in which the mountain parts 210 and the valley parts 220 are formed in a right-angled triangular shape, therefore, it is necessary to configure the mountain parts 210 and the valley parts 220 such that the interior angle (the angle between the first inclined side 211 and the second inclined side 212) of each of the valley parts 220 is decreased while the height of each of the mountain parts 210 is not excessively increased to improve adhesive force between water and the valley parts 220.

0099The first inclined side 211 of each of the mountain parts 210 may be located more at the front of the case 110 than the second inclined side 212 of each of the mountain parts 210.

0100The apex of each of the mountain parts 210 formed by the first inclined side 211 and the second inclined side 212 may be rounded to prevent dew formed at the apex of each of the mountain parts 210 from dropping into the case 110 due to gravity and to guide the dew formed at the apex of each of the mountain parts 210 to the valley parts 220.

0101A pitch P between the respective mountain parts 210 may be 1.5 mm to 2.5 mm. In a case in which the pitch P between the respective mountain parts 210 is greater than 2.5 mm, dew formed on the inner surface of the case 110 cannot easily move to the valley parts 220. On the other hand, in a case in which the pitch P between the respective mountain parts 210 is less than 1.5 mm, each of the valley parts 220 cannot provide a sufficient space to collect dew with the result that the dew may be observed by the naked eye.

0102In addition, each of the mountain parts 210 may have a height of 1.5 mm to 2.5 mm. In a case in which the height of each of the mountain parts 210 is too large, the strength of the case 110 is lowered. On the other hand, in a case in which the height of each of the mountain parts 210 is too small, each of the valley parts 220 cannot provide a sufficient space to collect dew.

0103Referring back to <figref idref="f0009">FIG. 9B</figref>, the embodiment of the present invention may further include auxiliary channels 225 intersecting the guide channels 200, the auxiliary channels 225 being depressed in the inner surface of the case 110.

0104Dew formed in the case 110 moves along the valley parts 220 in the left and right direction of the case 110. Movement of the dew to the front and the rear of the case 110 is restricted by the mountain parts 210. In a case in which the amount of dew formed in the case 110 is excessive, the dew may not spread out along the valley parts 220 but may drop into the case 110.

0105The auxiliary channels 225 intersect the mountain parts 210 and the valley parts 220 to guide water to adjacent other valley parts 220 in a case in which the amount of dew formed in the case 110 is excessive.

0106Specifically, the auxiliary channels 225 extend from the front to the rear of the case 110 such that the auxiliary channels 225 communicate with the valley parts 220.

0107Hereinafter, the guide channels 200a to 200d formed at the respective surfaces of the case 110 will be described in detail.

0108Referring to <figref idref="f0005">FIGS. 5</figref> and <figref idref="f0007 f0010">7 to 10</figref>, the guide channels 200a to 200d may include top surface guide channels 200a, lateral surface guide channels 200b, rear surface guide channels 200d, and bottom surface guide channels 200c.

0109The top surface guide channels 200a are formed at the inner side of the top surface 110a of the case 110. The mountain parts 210 and the valley parts 220 of the top surface guide channels 200a may extend toward the lateral surfaces 110b of the case 110. In addition, the mountain parts 210 and the valley parts 220 of the top surface guide channels 200a may extend from the front to the rear surface 110d of the case 110.

0110The top surface 110a of the case 110 may be inclined downward from the middle of the case to the lateral surfaces 110b of the case 110 such that water formed on the inner surface of the case 110 is guided to the lateral surfaces 110b of the case 110 along the top surface guide channels 200a due to gravity. That is, as shown in <figref idref="f0007">FIG. 8</figref>, the top surface 110a of the case 110 may be configured to have an arch structure in which the middle portion of top surface 110a of the case 110 protrudes upward from the case 110. In a case in which the top surface 110a of the case 110 is formed as described above, the strength of the top surface 110a of the case 110 is increased and water formed on the top surface 110a of the case 110 can be guided to the lateral surfaces 110b of the case 110 due to gravity.

0111The lateral surface guide channels 200b are formed at the inner sides of the lateral surfaces 110b of the case 110. The mountain parts 210 and the valley parts 220 of the lateral surface guide channels 200b may extend from the top surface 110a of the case 110 to the bottom surface 110c of the case 110 such that water formed on the lateral surfaces 110b of the case 110 can flow toward the bottom surface 110c of the case 110 due to gravity.

0112In addition, the valley parts 220 of the top surface guide channels 200a may be connected to (communicate with) the valley parts 220 of lateral surface guide channels 200b such that water formed on the top surface 110a of the case 110 can be effectively guided to the lateral surfaces 110b of the case 110.

0113The rear surface guide channels 200d are formed at the inner side of the rear surface 110d of the case 110. The mountain parts 210 and the valley parts 220 of the rear surface guide channels 200d may extend from the top surface 110a of the case 110 to the bottom surface 110c of the case 110 such that water formed on the rear surface 110d of the case 110 can flow toward the bottom surface 110c of the case 110 due to gravity.

0114The bottom surface guide channels 200c are formed at the inner side of the bottom surface 110c of the case 110.

0115The mountain parts 210 and the valley parts 220 of the bottom surface guide channels 200c may extend toward the discharge port 180 such that water formed in the case 110 can flow toward the discharge port 180 due to gravity. In addition, the bottom surface guide channels 200c may be inclined downward to the discharge port 180 to more effectively collect water.

0116For example, the bottom surface guide channels 200c may extend from the discharge port 180 in a radial manner. Of course, the valley parts 220 of the top surface guide channels 200a, the valley parts 220 of the lateral surface guide channels 200b, and the valley parts 220 of the bottom surface guide channels 200c may be connected to (communicate with) each other to effectively collect water.

0117As shown in <figref idref="f0007">FIG. 8</figref>, therefore, water (dew) formed in the case 110 may flow along a water movement channel f and then be collected at the discharge port 180.

0118A reinforcing part functions to increase the strength of the case 110.

0119For example, the reinforcing part may be embodied as a reinforcing member 130 coupled to one surface of the case 110. In a case in which the opening 113 is formed at the front of the case 110, the pressure inside the case 110 is lower than the pressure outside the case 110 with the result that the edge of the opening 113 droops toward the interior of the case 110. The reinforcing member 130 may prevent the edge of the opening 113 from drooping. The edge of the opening 113 includes front tips of the top surface 110a of the case 110, the bottom surface 110c of the case 110, and the lateral surfaces 110b of the case 110.

0120More specifically, the reinforcing member 130 may be disposed at the largest one of the surfaces of the case 110. That is, in a case in which the case 110 is formed in the shape of a rectangular parallelepiped having the opening 113 formed at the front thereof as shown in <figref idref="f0005">FIG. 5</figref>, the tips of the largest one (the top surface 110a or the bottom surface 110c of the case 110) of the surfaces of the case 110 are the most greatly deformed due to the difference in pressure between the inside and the outside of the case 110. In a case in which the reinforcing member 130 is disposed at the largest one of the surfaces of the case 110 while being adjacent to the edge of the opening 113, therefore, it is possible to effectively prevent deformation of the opening 113.

0121The reinforcing member 130 may be disposed at the top surface 110a of the case 110. In addition, the reinforcing member 130 may be disposed at the outside of the top surface 110a of the case 110 since the receiving space A is reduced in a case in which the reinforcing member 130 is disposed in the case 110.

0122The reinforcing member 130 may be disposed adjacent to the opening 113 since the edge of the opening is the most greatly deformed.

0123The reinforcing member 130 may be disposed in parallel to the edge of the opening 113. The term "parallel" does not mean "parallel" in mathematical terms but means "parallel while having an error" in engineering terms. In addition, the term "parallel" may mean "parallel" between curved lines disposed to correspond to each other while being spaced apart from each other by a fixed distance as well as "parallel" between straight lines. In a case in which the reinforcing member 130 is disposed in parallel to the edge of the opening 113, it is possible to more effectively prevent deformation of the edge of the opening 113.

0124In addition, the reinforcing member 130 may be disposed at the top surface 110a and/or the bottom surface 110b of the case 110 in a state in which one side of the reinforcing member 130 is coupled to the flange 119. In a case in which the reinforcing member 130 is coupled to the flange 119, it is possible to more effectively prevent deformation of the edge of the opening 113.

0125The reinforcing member 130 may have various shapes of high resistance to bending stress. For example, the reinforcing member 130 may include a first member 131, a second member 133 spaced apart from the first member 131, and a connection member 135 connected between the first member 131 and the second member 133, the connection member 135 having a through hole 136, through which a bolt fastened to the case 119 is inserted. That is, the reinforcing member 130 may have a bracket shape of high resistance to bending stress. The case 110 is provided at a portion thereof corresponding to the through hole 136 with a boss 114, to which the bolt is fastened.

0126The first member 131 and the second member 133 may be disposed perpendicularly to the top surface of the case 110 to improve resistance to bending stress. That is, the first member 131 and the second member 133 may be disposed in the upward and downward direction of the case 110.

0127In addition, one end of the first member 131 and one end of the second member 133 may contact one surface of the case 110 while having the same height as the reinforcing rib 111 to reduce a space occupied by the reinforcing member 130. In this case, the connection member 135 may have the same height as the upper end of the reinforcing member 130.

0128The reinforcing member 130 may be made of a material having higher strength than the case 110. For example, the reinforcing member 130 may be made of a metal material or an alloy material. Specifically, the reinforcing member 130 may be made of at least one selected among steel, a steel alloy, an aluminum alloy, a titanium alloy, stainless steel, and a stainless steel alloy. However, the present invention is not limited thereto.

0129<figref idref="f0011">FIG. 11</figref> is an enlarged sectional view showing part B of <figref idref="f0007">FIG. 7</figref>, <figref idref="f0012">FIG. 12</figref> is a sectional view showing a state in which an opening and closing valve of <figref idref="f0011">FIG. 11</figref> is open, and <figref idref="f0013">FIG. 13</figref> is a perspective view showing an opening and closing valve according to the present invention.

0130Referring to <figref idref="f0011 f0012 f0013">FIGS. 11 to 13</figref>, the discharge port 180 may include a water collection part 181 and a discharge part 182. Directions hereinafter mentioned are based on <figref idref="f0011">FIGS. 11</figref> and <figref idref="f0012">12</figref>.

0131As shown in <figref idref="f0011">FIG. 11</figref>, the discharge port 180 is a hole formed through the bottom surface 110c of the case 110. The shape of the discharge port 180 is not particularly restricted. The discharge port 180 may have various shapes so long as the discharge port 180 provides a water discharge channel. However, the discharge port 180 may have a shape corresponding to a valve shaft 172 of the opening and closing valve 170 such that the valve shaft 172 of the opening and closing valve 170 can reciprocate in the discharge port 180.

0132The water collection part 181 may be depressed in a portion of the bottom surface 110c of the case 110 to collect water in the case 110. The water collection part 181 is a part to which water formed in the case 110 flows along the inner surface of the case 110 such that the water is collected at the water collection part 181. In addition, an elastic spring 174, which will hereinafter be described, is located in the water collection part 181 such that elastic force of the elastic spring 174 is supported by the water collection part 181.

0133The discharge part 182 allows the water collection part 181 to communicate with the outside of the case 110 such that the water collected at the water collection part 181 can be discharged out of the case 110. The discharge part 182 may have a smaller width than the water collection part 181. The width means a length in the left and right direction in <figref idref="f0011">FIG. 11</figref>. In addition, the discharge part 182 may have a smaller size or inner diameter than the water collection part 181.

0134One end of the elastic spring 174 is located at a step (or the bottom of the water collection part 181) formed by the difference in width between the water collection part 181 and the discharge part 182.

0135More specifically, the water collection part 181 and the discharge part 182 may each be formed in the shape of a hole. The water collection part 181 and the discharge part 182 may have the same central axis. The outer diameter of the water collection part 181 may be greater than the outer diameter of the discharge part 182. That is, the water collection part 181 may be depressed in a portion of the bottom surface 110c of the case 110 and the discharge part 182 may be formed through the bottom surface of the water collection part 181 such that the discharge part 182 communicates with the outside of the case 110.

0136For example, the discharge part 182 may be a through hole formed through the bottom of the water collection part 181. In another example, the discharge part 182 may be a hole formed by a boss 184 protruding downward from the bottom surface 110c of the case 110.

0137The boss 184 may be integrally formed with the case 110. Alternatively, the boss 184 may be separately manufactured and then coupled to the case 110. The boss 184 protrudes downward from the bottom surface 110c of the case 110 to provide a space into which a plug 171 of the opening and closing valve 170 is inserted such that the plug 171 of the opening and closing valve 170 can be hermetically sealed.

0138For example, an empty space, in which the discharge port 182 is defined, is provided in the boss 184. The opening and closing valve 170 reciprocates in the empty space. Water is discharged from the case 110 through the empty space. In addition, a hermetical sealing surface 184a corresponding to the plug 171 may be formed at the surface of the boss 184 contacting the plug 171.

0139More specifically, in a case in which the plug 171 is formed in a globular shape, the hermetical sealing surface 184a may be depressed in one end of the boss 184.

0140In addition, the boss 184 may be made of any one selected from among rubber, synthetic resin, and silicone to increase hermetical sealing force. Of course, the boss 184 may be made of the same material as the case 110.

0141The opening and closing valve 170 may reciprocate in the discharge port 180 to open and close the discharge port 180. In addition, the opening and closing valve 170 may be moved to one side by external force such that the opening and closing valve 170 is opened and the opening and closing valve 170 may be moved to the other side by elastic force such that the opening and closing valve 170 is closed. For example, the opening and closing valve 170 may be moved to one side by contact with the drawer 120 such that the opening and closing valve 170 is opened and the opening and closing valve 170 may be moved to the other side by elastic force such that the opening and closing valve 170 is closed.

0142The position of the opening and closing valve 170 is not particularly restricted. The opening and closing valve 170 may be disposed adjacent to the opening 113 of the case 110. In a case in which the opening and closing valve 170 is disposed adjacent to the opening 113 of the case 110, the opening and closing valve 170 cannot be observed by the naked eye unless the drawer is completely separated from the case 110.

0143For example, the opening and closing valve 170 includes a plug 171, a head 173, a valve shaft 172, and an elastic spring 174.

0144The plug 171 reciprocates upward and downward to open and close the discharge part 182.

0145The plug 171 may have various shapes to open and close the discharge part 182 and to hermetically seal the discharge part 182. For example, the plug 171 may have a larger width (or outer diameter) than the discharge part 182. The plug 171 may be formed in a globular shape. Of course, the hermetical sealing surface 184a may be formed at one side of the boss 184 which the plug 171 contacts. In addition, the plug 171 may be located outside the case 110. In another example, the plug 171 may have a larger width (or outer diameter) than the discharge part 182 and a smaller width (or outer diameter) than the boss 184 such that the plug 171 can be inserted into the boss 184 when the discharge part 182 is hermetically sealed by the plug 171.

0146The plug 171 may be made of rubber or silicone to increase hermetical sealing force with the discharge part 182.

0147The valve shaft 172 is connected to one end of the plug 171.

0148One end of the head 173 may be connected to the valve shaft 172. The head 173 may have a larger width than the valve shaft 172. The head 173 may be located in the case 110. Specifically, the head 173 may be located on the water collection part 181 of the discharge port 180. The width of the head 173 may be greater than the width of the valve shaft 172 and the width of the water collection part 181. That is, the width of the head 173 may be greater than the width of the valve shaft 172 to provide a space in which the elastic spring fitted on the valve shaft 172 is supported. In addition, the width of the head 173 may be greater than the width of the water collection part 181 such that the head 173 serves as a stopper caught by the bottom surface 110c of the case 110 when the opening and closing valve 170 reciprocates upward and downward. Of course, the head 173 prevents the introduction of foreign matter into the water collection part 181.

0149The head 173 further includes a plurality of introduction preventing pieces 175 to prevent the introduction of foreign matter having a predetermined size or more. As shown in <figref idref="f0013">FIG. 13</figref>, the introduction preventing pieces 175 are disposed around the head 173 such that the introduction preventing pieces 175 are spaced apart from each other. The introduction preventing pieces 175 may extend from the head 173 to the water collection part 181. That is, the introduction preventing pieces 175 may be disposed at the bottom surface of the head 173 in a state in which the introduction preventing pieces 175 are adjacent to the edge thereof such that the introduction preventing pieces 175 are spaced apart from each other. A spacing distance between adjacent ones of the introduction preventing pieces 175 may be adjusted to adjust the size of foreign matter prevented from being introduced into the water collection part 181.

0150During reciprocation of the opening and closing valve 170, the introduction preventing pieces 175 reciprocate in the water collection part 181 to also perform a guide function.

0151The head 173 may contact the bottom surface of the drawer 120 during movement of the drawer 120. Specifically, when the drawer 120 is moved, the bottom surface of the receiving part 123 comes into contact with the head 173 with the result that the head 173 is pushed. When the head 173 is pushed, the opening and closing valve 170 is opened.

0152The top surface of the head 173 may have a round shape protruding upward to minimize with the drawer 120 during movement of the drawer 120.

0153The valve shaft 172 is connected between the plug 171 and the head 173. The valve shaft 172 extends through the discharge port 180. That is, the valve shaft 172 reciprocates the plug 171 and the head 173 connected to one end and the other end thereof while reciprocating in the discharge port 180. As a result, the reciprocation of the head 173 is transmitted to the plug 171 via the valve shaft 172.

0154Specifically, the valve shaft 172 may have a smaller width than the head 173 and the plug 171. In addition, the valve shaft 172 may have a smaller width (or outer diameter) than the water collection part 181 and the discharge part 182.

0155The elastic spring 174 is provided in the discharge port 180 to apply elastic force to reciprocation of the opening and closing valve 170. Specifically, one end of the elastic spring 174 contact the head 173 and the other end of the elastic spring 174 contact the step defined between the water collection part 181 and the discharge part 182. In addition, the elastic spring 174 is located in the water collection part 181. The elastic spring 174 provides restoring force to restore the opening and closing valve 170 to the interior of the case 110.

0156Hereinafter, operation of the opening and closing valve 170 will be described with reference to <figref idref="f0011">FIGS. 11</figref> and <figref idref="f0012">12</figref>.

0157Referring to <figref idref="f0011">FIG. 11</figref>, in an initial stage, the plug 171 and the discharge part 182 is in a hermetically sealed state by elastic force of the elastic spring 174. As a result, the interior of the case 110 is maintained in a low vacuum state.

0158Referring to <figref idref="f0012">FIG. 12</figref>, the head 173 is moved downward as external force is applied to the head 173 (for example, the drawer 120 contacts the head 173). As a result, the head 173 moves the valve shaft 172 and the plug 1171 downward. At this time, the plug 171 becomes spaced apart from the discharge part 182 with the result that water is discharged from the case 110 through the discharge part 182.

0159<figref idref="f0013">FIGS. 14</figref> and <figref idref="f0014">15</figref> are views illustrating operation of the opening and closing valve according to the present invention.

0160<figref idref="f0013">FIG. 14</figref> is a sectional view showing a state in which the case 110 is hermetically sealed by the drawer 120.

0161Referring to <figref idref="f0013">FIG. 14</figref>, the bottom surface of the drawer 120 comes into contact with the head 173 during movement of the drawer 120. Specifically, when the bottom surface of the receiving part 123 of the drawer 120 comes into contact with the head 173 during movement of the bottom surface of the receiving part 123 of the drawer 120, the head 173 is pushed to open the opening and closing valve 170.

0162The drawer 120 may be further provided at the bottom surface thereof (specifically, the bottom surface of the receiving part 123 thereof) with a push part 124 contacting the head 173. During movement of the drawer 120, the push part 124 comes into contact with the head 173 to push the head 173. The push part 124 may protrude below the receiving part 123.

0163In an initial stage, the case 110 is hermetically sealed by the drawer 120 and the interior of the case 110 is maintained in a low vacuum state. The opening and closing valve 170 is maintained in a closed state (a state in which the discharge part 182 is hermetically sealed by the plug 171) by elastic force of the elastic spring 174.

0164<figref idref="f0014">FIG. 15</figref> is a sectional view showing a state in which the drawer 120 is opened from the case 110.

0165The drawer 120 is opened while the low vacuum state of the interior of the case 110 is released. At this time, the drawer 120 moves to the front of the case 110 and the push part 124 pushes the head 173 of the opening and closing valve 170.

0166When the head 173 is pushed, the plug becomes spaced apart from the discharge part 182 with the result that water stored at the water collection part 181 is discharged out of the case 110.

0167The discharge port 180 is hermetically sealed by the opening and closing valve 170 due to elastic force of the elastic spring 174 at a normal time with the result that the interior of the case 110 is maintained in a low vacuum state. When the drawer 120 is opened, on the other hand, the opening and closing valve 170 is automatically opened to discharge water formed in the case 110 to the outside.

0168In addition, it is possible to discharge water formed in the case 110 to the outside through simple opening and closing of the drawer 120 based on the simple structure without additional control.

0169<figref idref="f0015">FIG. 16</figref> is a sectional view showing an opening and closing valve according to another not claimed embodiment of the present invention, <figref idref="f0016">FIG. 17</figref> is a sectional view showing a state in which the opening and closing valve of <figref idref="f0015">FIG. 16</figref> is open, and <figref idref="f0017">FIG. 18</figref> is a perspective view showing the opening and closing valve according to the not claimed embodiment of the present invention shown in <figref idref="f0015">FIG. 16</figref>.

0170Referring to <figref idref="f0015 f0016 f0017">FIGS. 16 to 18</figref>, a vegetable container 100 for refrigerators according to another not claimed embodiment of the present invention may include a case 110, a drawer 120, a discharge port 180, and an opening and closing valve 1700.

0171The discharge port 180 may include a water collection part 181 and a discharge part 182. Directions hereinafter mentioned are based on <figref idref="f0015">FIGS. 16</figref> and <figref idref="f0016">17</figref>.

0172As shown in <figref idref="f0015">FIG. 16</figref>, the discharge port 180 is a hole formed through the bottom surface 110c of the case 110. The shape of the discharge port 180 is not particularly restricted. The discharge port 180 may have various shapes so long as the discharge port 180 provides a water discharge channel. However, the discharge port 180 may have a shape corresponding to the opening and closing valve 1700 such that the opening and closing valve 1700 is located in the discharge port 180.

0173The water collection part 181 may be depressed in a portion of the bottom surface 110c of the case 110 to collect water in the case 110. The water collection part 181 is a part to which water formed in the case 110 flows along the inner surface of the case 110 such that the water is collected at the water collection part 181.

0174The discharge part 182 allows the water collection part 181 to communicate with the outside of the case 110 such that the water collected at the water collection part 181 can be discharged out of the case 110. The discharge part 182 may have a smaller width than the water collection part 181. The width means a length in the left and right direction in <figref idref="f0015">FIG. 16</figref>. In addition, the discharge part 182 may have a smaller size or inner diameter than the water collection part 181.

0175More specifically, the water collection part 181 and the discharge part 182 may each be formed in the shape of a hole. The water collection part 181 and the discharge part 182 may have the same central axis. The outer diameter of the water collection part 181 may be greater than the outer diameter of the discharge part 182. That is, the water collection part 181 may be depressed in a portion of the bottom surface 110c of the case 110 and the discharge part 182 may be formed through the bottom surface of the water collection part 181 such that the discharge part 182 communicates with the outside of the case 110.

0176The inner diameter or width of the water collection part 181 may be uniform. Alternatively, the water collection part 181 may have a step by which a catching protrusion of a fixing part, which will hereinafter described, is caught.

0177For example, the discharge part 182 may be a through hole formed through the bottom of the water collection part 181.

0178In this not claimed embodiment, the opening and closing valve 1700 is mounted in the discharge port 180 to open and close the discharge port 180. The opening and closing valve 1700 may be closed by the difference in pressure between the inside and the outside of the case 110 and may be opened when the difference in pressure between the inside and the outside of the case 110 is released. The opening and closing valve 1700 may be made of a material can be deformed by the difference in pressure between the inside and the outside of the case 110. For example, the opening and closing valve 1700 may be made of rubber or silicone exhibiting ductility and elasticity.

0179For example, the opening and closing valve 1700 may include a fixing part 1710 and tight contact lips 1750.

0180The fixing part 1710 has a space, through which water is discharged, defined therein. The fixing part 1710 is inserted and fixed in the discharge port 180. That is, the fixing part 1710 may have an external shape corresponding to an internal shape of the discharge port 180. The space of the fixing part 1710, through which water is discharged, may have various shapes. The fixing part 1710 may be fixed in the discharge port 180.

0181For example, in a case in which the discharge port 180 has a cylindrical shape, the external shape of the fixing part 1710 may be a cylindrical shape corresponding to the inner diameter of the discharge port 180. In addition, the water discharge space is defined in the fixing part 1710.

0182The fixing part 1710 may include a catching protrusion 1720 caught by the discharge port 180 and a distance maintaining part 1730 connected to the two tight contact lips 1750 to maintain the distance between the tight contact lips 1750.

0183The opening and closing valve 1700 is caught by the discharge port 180 through the catching protrusion 1720. Since the opening and closing valve 1700 is manufactured separately from the case 110 and then inserted into the discharge port 180 formed in the case 110, a fixing means is needed when the opening and closing valve 1700 is inserted into the discharge port 180. The catching protrusion 1720 is caught by the step formed in the discharge port 180 to fix the opening and closing valve 1700 in the discharge port 180.

0184The catching protrusion 1720 may has an enlarged size at the outer circumference of the fixing part 1710 such that the fixing part 1710 has a single step.

0185The catching protrusion 1720 is coupled to the step formed in the discharge port 180. The position of the step is not particularly restricted. For example, as shown in <figref idref="f0015">FIG. 16</figref>, the step may protrude from a portion of the interior of the discharge part 182.

0186The distance maintaining part 1730 is connected to the two tight contact lips 1750 to maintain the distance between the tight contact lips 1750. That is, the distance maintaining part 1730 is connected between the two tight contact lips 1750 and the catching protrusion 1720 such that the distance between the tight contact lips 1750 is uniform. That is, in a case in which the interior of the case 110 is maintained in a low vacuum state, the distance maintaining part 1730 may be deformed by the difference in pressure between the inside and the outside of the case 110 with the result that the two tight contact lips 1750 may come into contact with each other. On the other hand, in a case in which the low vacuum state of the interior of the case 110 is released, the two tight contact lips 1750 may become spaced apart from each other due to weight of the tight contact lips 1750 and the distance maintaining part 1730.

0187For example, the distance maintaining part 1730 may have at least two inclined surfaces 1730a and 1730b, the distance between which is gradually decreased from the catching protrusion 1720 to the tight contact lips 1750. That is, the distance maintaining part 1730 may have at least two inclined surfaces 1730a and 1730b such that the distance maintaining part 1730 is formed in a hopper shape having a water discharge channel defined therein.

0188That is, the distance maintaining part 1730 may have at least two inclined surfaces 1730a and 1730b, the distance between which is gradually decreased from the inside of the case 110 to the outside of the case 110.

0189When the drawer 120 is closed, the interior of the case 110 is maintained in a low vacuum state in which the pressure inside the case 110 is lower than the pressure outside the case 110. On the other hand, when the drawer 120 is opened, the pressure inside the case 110 becomes the atmospheric pressure which is equal to the pressure outside the case 110. Consequently, the distance maintaining part 1730 may have at least two inclined surfaces 1730a and 1730b, which exhibit uniform rigidity and the distance between which is gradually decreased from the inside of the case 110 and the outside of the case 110, to prevent the tight contact lips 1750, which are in a tight contact state due to great difference in pressure between the inside of the case 110 and the outside of the case 110, from being opened when the drawer 120 is closed.

0190The two inclined surfaces 1730a and 1730b deform the shape of the water discharge channel defined in the distance maintaining part 1730 into a slit shape when viewed from above (see <figref idref="f0015">FIGS. 16</figref> and <figref idref="f0012">12</figref>). That is, the distance between the two inclined surfaces 1730a and 1730b adjacent to the tight contact lips 1750 is small and the width between the front and the rear of the inclined surfaces 1730a and 1730b is relatively greater than the distance between the two inclined surfaces 1730a and 1730b. Consequently, the shape of the water discharge channel defined in the distance maintaining part 1730 becomes a slit shape having a narrow and long gap.

0191When the shape of the water discharge channel defined in the distance maintaining part 1730 becomes a slit shape due to the two inclined surfaces 1730a and 1730b, the two tight contact lips 1750 coupled to the lower ends of the inclined surfaces 1730a and 1730b becomes spaced apart from each other in a state in which a narrow and long gap is defined between the tight contact lips 1750. When the difference in pressure between the inside and the outside of the case 110 is generated, therefore, the two tight contact lips 1750 may easily contact each other with the result that it is possible to secure a large contact area. That is, the two tight contact lips 1750, each of which is formed in the shape of a plate, may be spaced apart from each other in a state in which a narrow gap is provided between the tight contact lips 1750 by the two inclined surfaces 1730a and 1730b.

0192Meanwhile, in a case in which the channel defined in the distance maintaining part 1730 is too wide, it may be difficult to achieve contact between the tight contact lips 1750 due to the difference in pressure between the inside and the outside of the case 110 with the result that external air may be introduced into the case 110. On the other hand, in a case in which the channel defined in the distance maintaining part 1730 is too narrow, it is not possible to easily discharge water in the case 110 to the outside. Since the channel defined in the distance maintaining part 1730 has a narrow and long slit shape due to the two inclined surfaces 1730a and 1730b, it is possible to provide a sufficient space, through which water is discharged, in the case 110 while increasing contact force between the tight contact lips 1750.

0193The distance between the two inclined surfaces 1730a and 1730b adjacent to the tight contact lips 1750 is set considering low vacuum pressure in the case 110 and weight of the distance maintaining part 1730 and the tight contact lips 1750. That is, the distance between the lower parts of the two inclined surfaces 1730a and 1730b is set to provide a sufficient space, through which water is discharged, in the case 110 while increasing contact force between the tight contact lips 1750.

0194The tight contact lips 1750 are connected to the lower part of the fixing part 1710 such that the tight contact lips 1750 can come into tight contact with each other due to the difference in pressure between the inside and the outside of the case 110.

0195For example, the tight contact lips 1750 may be connected to the inclined surfaces 1730a and 1730b of the distance maintaining part 1730 such that the tight contact lips' 1750 are spaced apart from each other by a predetermined distance. Each of the tight contact lips 1750 may be formed in the shape of a plate.

0196Each of the tight contact lips 1750 may be made of a deformable material such that the tight contact lips 1750 come into tight contact with each other to close the opening and closing valve 1700 when the pressure inside the case 110 is lower than the pressure outside the case 110 and the tight contact lips 1750 become spaced apart from each other to open the opening and closing valve 1700 when the difference in pressure between the inside and the outside of the case 110 is released.

0197That is, the two tight contact lips 1750 are spaced apart from each other by a slit type distance due to the two inclined surfaces 1730a and 1730b. That is, in a case in which the interior of the case 110 is in a low vacuum state, the distance maintaining part 1730 may be deformed or the tight contact lips 1750 may be partially deformed due to the difference in pressure between the inside and the outside of the case 110 with the result that the two tight contact lips 1750 may come into contact with each other. On the other hand, in a case in which the low vacuum state of the interior of the case 110 is released, the two tight contact lips 1750 may become spaced apart from each other due to weight of the tight contact lips 1750 and the distance maintaining part 1730.

0198For example, the two tight contact lips 1750 may be disposed so as to correspond to each other such that the tight contact lips 1750 can come into surface contact with each other. Each of the tight contact lips 1750 may have a sufficient area. Specifically, each of the tight contact lips 1750 may be formed in a plate shape and the tight contact lips 1750 may be disposed such that the largest surfaces of the tight contact lips 1750 face each other.

0199The two tight contact lips 1750 are disposed at the tips of the two inclined surfaces 1730a and 1730b in parallel to the inclined surfaces 1730a and 1730b.

0200In this not claimed embodiment, a shape maintaining part 1770 may be further included to prevent the tight contact lips 1750 from being spaced apart from each other as the result of excessive deformation of the fixing part 1710 of the opening and closing valve 1700 due to excessive difference in pressure between the inside and the outside of the case 110.

0201The shape maintaining part 1770 has a water discharge space defined therein. The shape maintaining part 1770 is inserted into the fixing part 1710 from above the fixing part 1710 to maintain the shape of the fixing part 1710.

0202For example, the shape maintaining part 1770 may have an outer diameter corresponding to the inner diameter of the fixing part 1710, which is formed in a cylindrical shape. In addition, the shape maintaining part 1770 may exhibit higher rigidity than the opening and closing valve 1700.

0203The shape maintaining part 1770 may be provided with an introduction preventing protrusion 175a to prevent foreign matter in the case 110 from being introduced into the fixing part 1710.

0204A plurality of introduction preventing protrusions 175a is disposed at the outer circumference of the upper end of the shape maintaining part 1770 while protruding upward in a state in which the introduction preventing protrusions 175a are spaced apart from each other by a predetermined distance. The distance between the respective introduction preventing protrusions 175a adjusts the size of foreign matter introduced into the fixing part 1710 from the interior of the case 110.

0205The introduction preventing protrusions 175a may protrude upward from the shape maintaining part 1770. More specifically, the introduction preventing protrusions 175a may protrude higher than the bottom surface 110c of the case 110. That is, the top surface of each of the introduction preventing protrusions 175a may be disposed higher than the bottom surface 110c of the case 110 to prevent introduction of foreign matter into the discharge port 180 formed at the bottom surface 110c of the case 110. Of course, in a case in which the water collection part 181 is formed at the discharge port 180, the introduction preventing protrusions 175a may protrude more than the lower surface of the water collection part 181.

0206The top surface of the shape maintaining part 1770, at which the introduction preventing protrusions 175a are not formed, may have a lower height than or the same height as the bottom surface 110c of the case 110 such that water in the case 110 can be introduced into the opening and closing valve 1700.

0207In this not claimed embodiment, in a case in which the drawer 120 is closed and, therefore, the interior of the case 110 is in a low vacuum state, the two tight contact lips 1750 come into tight contact with each other with the result that the low vacuum state of the interior of the case 110 is prevented from being released as the result of the introduction of external air into the case 110. On the other hand, in a case in which the drawer 120 is opened and, therefore, the low vacuum state of the interior of the case 110 is released, the two tight contact lips 1750 become spaced apart from each other with the result that water formed in the case 110 can be discharged out of the case 110. That is, it is possible to discharge water in the case 110 to the outside while maintaining the interior of the case 110 in a low vacuum state through the simple structure without the provision of an additional controller or a drive part.

0208Hereinafter, operation of the opening and closing valve will be described with reference to <figref idref="f0015">FIGS. 16</figref> and <figref idref="f0016">17</figref>.

0209Referring to <figref idref="f0015">FIG. 16</figref>, the drawer 120 is closed in an initial stage and, therefore, the interior of the case 110 is in a low vacuum state. At this time, force is applied from the outside of the case 110 to the inside of the case 110 due to the difference in pressure between the inside and the outside of the case 110 with the result that the distance between the tight contact lips 1750 and, therefore, the tight contact lips 1750 come into tight contact with each other.

0210When the tight contact lips 1750 come into tight contact with each other, external air is prevented from being introduced into the case 110 with the result that the low vacuum state of the interior of the case 110 is prevented from being released.

0211Referring to <figref idref="f0016">FIG. 17</figref>, when the drawer 120 is opened or the low vacuum state of the interior of the case 110 is released by another means, the difference in pressure between the inside and the outside of the case 110 is released with the result that the tight contact lips 1750 become spaced apart from each other due to weight of the distance maintaining part 1730.

0212When the two tight contact lips 1750 become spaced apart from each other, the opening and closing valve 1700 is opened with the result that water in the case 110 is discharged out of the case 110.

0213As is apparent from the above description, the refrigerator according to the present invention has one or more of the following effects.

0214The present invention has an effect in that the edge of an opening of a case is designed to have an arch structure to prevent the circumference of the opening of the case from being bent inside the case.

0215In addition, the present invention has an effect in that a flange is formed at the edge of the opening to prevent the edge of the opening from drooping and to provide a, contact surface between a hermetical sealing member and a drawer.

0216In addition, the present invention has an effect in that a reinforcing member is coupled adjacent to the edge of the opening to reduce deformation of the edge of the opening.

0217In addition, the present invention has an effect in that deformation of the edge of the opening is restrained, whereby it is possible to continuously maintain the interior of a vegetable container in a low vacuum state.

0218In addition, the present invention has an effect in that dew formed on the inner surface of the case moves to valley parts along guide channels formed at the inner surface of the case, whereby the dew cannot be observed by the naked eye.

0219In addition, the present invention has an effect in that the top surface of the case is inclined downward to lateral surfaces of the case, whereby dew formed on the top surface of the case can be effectively guided to the lateral surfaces of the case due to gravity.

0220In addition, the present invention has an effect in that the bottom surface of the case is inclined downward to a water collection part, whereby water guided from the top surface and the lateral surfaces of the case can effectively flow to the water collection part.

0221In addition, the present invention has an effect in that an opening and closing valve is disposed in a discharge port, whereby water can be easily discharged from the case.

0222In addition, the present invention has an effect in that the discharge port is hermetically sealed by the opening and closing valve due to external force of an elastic spring at a normal time, whereby the interior of the case is maintained in a low vacuum state and, when the drawer is opened, the opening and closing valve is automatically opened to discharge water formed in the case to the outside.

0223In addition, the present invention has an effect in that in a case in which the drawer is closed and, therefore, the interior of the case is in a low vacuum state, two tight contact lips come into tight contact with each other, whereby the low vacuum state of the interior of the case is prevented from being released as the result of the introduction of external air into the case and, in a case in which the drawer is opened and, therefore, the low vacuum state of the interior of the case is released, the two tight contact lips become spaced apart from each other, whereby water formed in the case can be discharged out of the case.

0224In addition, the present invention has an effect in that the opening and closing valve is disposed adjacent to the opening of the case, whereby the opening and closing valve cannot be observed by the naked eye unless the drawer is completely separated from the case and thus the aesthetical appearance is improved.

0225In addition, the present invention has an effect in that water formed in the case can be discharged to the outside through simple opening and closing of the drawer based on a simple structure without additional control.

0226In addition, the present invention has an effect in that mountain parts and valley parts are alternately arranged from the front to the rear of the case, whereby a user located in front of the case cannot see the dew stored in the valley parts.

0227In addition, the present invention has an effect in that the mountain parts are formed in a right-angled triangular shape in a state in which an interior angle of each of the valley parts is decreased while the height of each of the mountain parts is not excessively increased to improve adhesive force between water and the valley parts.

0228It will be appreciated by those skilled in the art that the present invention pertains that the effects that can be achieved through the present invention are not limited to what has been particularly described hereinabove and other advantages of the present invention will be more clearly understood from the accompanying claims.

0229Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the invention as disclosed in the accompanying claims.