Contaminant sealing device

The present invention is a contamination provided with a ring-shaped packing for reciprocating movement or rotation, which is attached to one of two members facing each other and slidably close to the other member.<u style="single">for</u>It relates to a sealing device. Contamination of the present invention<u style="single">for</u>The sealing device is used, for example, as a device for sealing the reciprocating portion of the solenoid valve.

Conventionally, for example, in the bottleneck between the valve of the solenoid valve and the body, contamination may enter from the outside and cause a malfunction. A sealing mechanism may be installed in the same part to prevent contamination from entering, but if a conventionally known ordinary packing or the like is used, the sealing property is filled, so that there is a problem that friction becomes high. In order to reduce friction, an X-ring having an X-shaped cross section (hereinafter referred to as "conventional technique 1", for example, refer to Patent Document 1) is used to reduce the sliding portion of the lip sliding portion as shown in FIG. However, even if the X-ring of the prior art 1 is used, if the pressure of the fluid to be sealed changes, the friction fluctuates as shown in FIG. was there. The friction test was performed with a seal diameter of φ = 4.8 mm and a tightening allowance of 0.1 mm. The pressure [MPa] on the horizontal axis in FIG. 8 indicates the pressure difference between the high pressure side and the low pressure side.

On the other hand, an invention as shown in FIG. 9 for the purpose of suppressing a change in friction and maintaining a stable sealing performance even when the pressure of the fluid to be sealed changes (hereinafter referred to as "conventional technique 2"). For example, see Patent Document 2.). In the prior art 2, a side ring and a buck ring are attached in addition to the seal ring, and even if the pressure of the fluid to be sealed changes, the fluid pressure acting on the buck ring is blocked by the side ring to prevent the buck ring from being deformed. By doing so, the change in the friction of the seal ring is suppressed, so that there is a drawback that the number of parts is large and the required space is also large.

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2006-266279</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2006-112486</text></patcit></p>

<p> The present invention is contaminated.<u style="single">for</u>In terms of sealing, considering that complete sealing is not required compared to fluid sealing, the sliding part on the high pressure side of the conventional X ring is eliminated and the sliding part is provided on the low pressure side, and the sealing ring itself is accompanied by tightening of the sealing ring. By adopting an arrangement structure that can balance the expansion force of the seal and the pressure of the sealing fluid acting on the outer surface of the sealing ring, the pressing force of the sliding part does not increase proportionally even if the sealing fluid pressure increases, and the sealing fluid. Contamination that can reduce the amount of change in friction of sliding parts with respect to changes in pressure<u style="single">for</u>It is an object of the present invention to provide a sealing device. Further, the present invention is a contamination that can reduce the number of parts and the required space.<u style="single">for</u>It is an object of the present invention to provide a sealing device. Further, the present invention is a contamination capable of appropriately controlling the tightening allowance of the sealing ring.<u style="single">for</u>It is an object of the present invention to provide a sealing device. In the present invention, contamination<u style="single">for</u>Sealing means sealing contaminants contained in the sealing fluid, not completely sealing the sealing fluid.</p>

<p> Contamination of the present invention to achieve the above object<u style="single">for</u>The sealing device is firstly used in a sealing device provided with a ring-shaped packing for reciprocating movement or rotation, which is attached to one of two members facing each other and slidably close to the other member. The cross-sectional shape of the shaped packing is approximately y-shaped, and the back portion of the substantially y-shape is arranged so as to face the high pressure side, and a space formed by the back portion of the substantially y-shape and two members facing each other. It is characterized in that the high-pressure side fluid acts on the surface.</p><p> According to the first feature, the pressing force of the sliding portion does not increase proportionally even if the sealing fluid pressure increases, and the amount of change in the friction of the sliding portion can be reduced with respect to the change in the sealing fluid pressure. In addition, the number of parts can be reduced and the required space can be reduced.</p><p> In addition, the contamination of the present invention<u style="single">for</u>Secondly, in the first feature, the sealing device mounts the ring-shaped packing in the ring-shaped groove of the outer member, and the upper portion having a substantially y-shaped cross section is in close contact with the outer member, and the lower portion. Is characterized in that it is arranged so as to slide with the inner member. According to the second feature, in addition to the effect of the first feature, it is possible to secure a mounting space for the ring-shaped packing and facilitate mounting.</p><p> In addition, the contamination of the present invention<u style="single">for</u>Thirdly, in the first or second feature, the sealing device arranges a ring-shaped spacer on one side surface of the ring-shaped packing having a substantially y-shaped cross section, and rings with a pressing jig via the ring-shaped spacer. The feature is that the ring-shaped packing can be mounted, and the tightening allowance of the ring-shaped packing can be managed by adjusting the mounting position of the ring-shaped spacer. According to the third feature, the tightening allowance of the ring-shaped packing can be properly managed, and the amount of change in the friction of the sliding portion can be minimized. In addition, the contamination of the present invention<u style="single">for</u>Fourth, the sealing device is a contamination of any of the first to third features.<u style="single">for</u>The feature is that the sealing device is incorporated into the solenoid valve for capacity control. According to the fourth feature, it is possible to prevent foreign matter from being caught in the minute gap between the valve body and the valve housing without increasing the capacity control solenoid valve, and as a result, it is not necessary to increase the thrust of the solenoid.</p>

<p> The present invention has the following excellent effects. (1) The cross-sectional shape of the ring-shaped packing is approximately y-shaped, and the back portion of the substantially y-shape is arranged so as to face the high pressure side. By allowing the high-pressure side fluid to act on the space formed by, the pressing force of the sliding part does not increase proportionally even if the sealing fluid pressure increases, and the friction of the sliding part with respect to the change in the sealing fluid pressure. The amount of change in can be reduced. In addition, the number of parts can be reduced and the required space can be reduced. (2) The ring-shaped packing is mounted in the ring-shaped groove of the outer member, and the upper part having a substantially y-shaped cross section is in close contact with the outer member, and the lower part is arranged so as to slide with the inner member. Therefore, it is possible to secure a mounting space for the ring-shaped packing and facilitate mounting. (3) A ring-shaped spacer is arranged on one side surface of the ring-shaped packing having a substantially y-shaped cross section, and the ring-shaped packing is configured so that the ring-shaped packing can be mounted by a pressing jig via the ring-shaped spacer. By making it possible to manage the tightening allowance of the ring-shaped packing by adjusting the built-in position, it is possible to properly manage the tightening allowance of the ring-shaped packing and minimize the amount of change in friction of the sliding part. can do. (4) Contamination of the present invention<u style="single">for</u>By incorporating the sealing device into the capacity control solenoid valve, it is possible to prevent foreign matter from being caught in the minute gap between the valve body and the valve housing without enlarging the capacity control solenoid valve, and as a result, the thrust of the solenoid. There is no need to increase.</p>

<figref num="1">Contamination according to the embodiment of the present invention<u style="single">for</u>It is a front sectional view which shows the sealing device.</figref><figref num="2">It is a front sectional view which showed the example of the ring-shaped packing which concerns on embodiment of this invention.</figref><figref num="3">The results of the friction test when the ring-shaped packing having a substantially y-shaped cross section of the present invention are used are shown.</figref><figref num="4">FIG. 5 is a front sectional view showing a case where the ring-shaped packing having a substantially y-shaped cross section of the present invention is applied to a solenoid valve for capacity control.</figref><figref num="5">It is a front sectional view of the main part for demonstrating the case where the ring-shaped packing having a substantially y-shaped cross section of this invention is attached to a solenoid valve for capacity control.</figref><figref num="6">FIG. 5 is a front sectional view showing a state in which a ring-shaped packing having a substantially y-shaped cross section of the present invention is mounted on a solenoid valve for capacity control.</figref>

<figref num="7">It is a front sectional view which shows the X ring which concerns on the prior art 1.</figref><figref num="8">The result of the friction test when the X ring of the prior art 1 is used is shown.</figref><figref num="9">It is a front sectional view which shows the prior art 2.</figref>

Contamination according to the present invention<u style="single">for</u>The embodiment for carrying out the sealing device will be described in detail with reference to the drawings, but the present invention is not construed as being limited thereto, and as long as it does not deviate from the scope of the present invention, it will be in the knowledge of those skilled in the art. Based on this, various changes, modifications and improvements can be made.

Figure 1 shows contamination<u style="single">for</u>It is a front sectional view showing a sealing device, and among the member 1 located on the outside and the member 2 located on the inside, the ring-shaped groove 5 for mounting the ring-shaped packing 3 is provided on the outer member 1. The ring-shaped packing 3 is arranged so that the inner peripheral surface of the ring-shaped packing 3 is slidably in close contact with the inner member 2. The cross-sectional shape of the ring-shaped packing 3 is substantially y-shaped, and the back portion 4 of the substantially y-shape is arranged so as to face the high pressure side. Therefore, the fluid on the high pressure side is formed in the space 8 having a substantially triangular cross section formed by the back portion 4 having a substantially y-shape, one side surface of the ring-shaped groove 5 of the outer member 1 and the sliding surface of the inner member 2. Is working.

In the example shown in FIG. 1, the ring-shaped packing 3 is mounted on the ring-shaped groove 5 of the outer member 1, and the upper portion 6 having a substantially y-shaped cross section is in close contact with the ring-shaped groove 5 of the outer member. The side portion 7 is arranged so as to slide with the inner member 2. On the other hand, when the ring-shaped packing 3 is mounted in the ring-shaped groove of the inner member 2, the upper portion 6 having a substantially y-shaped cross section is in close contact with the ring-shaped groove of the inner member 2, and the lower portion 7 Is arranged so as to slide with the outer member 2. As described above, in the ring-shaped packing 3 having a substantially y-shaped cross section according to the present invention, the sliding portion on the high pressure side of the conventional X ring is eliminated to reduce the sliding portion, and the sliding portion is provided on the low pressure side. This is the first feature, and the second feature is that the force to spread against the tightening force of the ring-shaped packing 3 is reduced by the pressure of the sealing fluid.

Here, the "substantially y-shaped" may mean that the basic shape is y-shaped, and the three points 3-1, 3-2, and 3-3 on the outside of the substantially y-shaped form the seal portion. It means something that has become. The "back portion of the substantially y-shape" is the portion indicated by reference numeral 4 in FIG. 1, and refers to the surface of the short side and the long side constituting the substantially y-shape opposite to the short side of the long side. It is a thing. Further, the "upper part of the substantially y-shape" is the upper part of the y-shape, that is, the part indicated by reference numeral 6 in FIG. 1, and the "lower part of the substantially y-shape" is the y-shape. Refers to the lower side, that is, the portion indicated by reference numeral 7 in FIG.

FIG. 2 is a front sectional view showing another example of the ring-shaped packing 3. The ring-shaped packing 3 is formed in an annular shape from a material such as hydrogenated nitrile rubber (HNBR) or ethylene propylene rubber (EPDM), and its cross-sectional shape is y-shaped in FIG. Approximately y-shaped with a substantially trapezoidal protrusion 9 with a flat top at the center of the back part 4, and in Fig. (C), a substantially triangular shape with a rounded top at the center of the y-shaped back part 4. It has an approximately y-shape with a protrusion 9'. In Figures (a), (b), and (c), the tips of the three points 3-1, 3-2, and 3-3 on the outside of the approximately y-shape have a rounded shape, respectively. ), The tip may be straight and the corners at both ends may be brought into close contact with the members 1 and 2. As shown in the figure, the line connecting the three points 3-1, 3-2, and 3-3 on the outside of the abbreviation y-shape draws a smooth curve that is recessed inward. The one shown in Fig. 1 is different from the one shown in Fig. 2 (a) in that the line connecting the two outer points 3-2 and 3-3 is a straight line.

FIG. 3 shows the results of a friction test on the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention. The test conditions were the same as for the X ring of the prior art 1, the seal diameter was φ = 4.8 mm, and the tightening allowance was 0.1 mm. From this figure, when the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention is used, the friction is reduced to 1/2 to 1/3 as compared with the case where the conventional X ring is used. It can also be seen that the friction is substantially constant even when the pressure of the sealing fluid increases. The reduction in friction is due to the elimination of the high-pressure side sliding portion of the conventional X-ring in the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention. The reason why the friction is substantially constant even when the pressure is increased is that when the elastic ring-shaped packing 3 is appropriately tightened, a force that repels the ring-shaped packing 3 is generated to increase the friction. , The force to spread and the force to shrink the sliding part 3-3 of the ring-shaped packing 3 due to the pressure of the sealing fluid acting on the back part 4 of the ring-shaped packing 3 having a substantially y-shape (sliding). It is considered that the friction is substantially constant due to the balance of the force acting in the direction away from the mating member).

FIG. 4 is a front sectional view showing a case where the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention is applied to a solenoid valve for capacity control. In this example, the ring-shaped packing 3 is mounted in the barrier 15 between the valve body 11 and the valve housing 12, which are reciprocated in the left-right direction by the solenoid 10, and between the low-pressure side 13 and the high-pressure side 14. This is to prevent contamination on the low pressure side 13. The ring-shaped packing 3 is mounted in the ring-shaped groove 16 provided in the valve housing 12, and the lower side of the substantially y-shape slides on the valve body 11 and the upper side is in close contact with the ring-shaped groove 16 and is substantially y. The back part 4 of the character shape is arranged so as to face the high pressure side 14. As described above, by incorporating the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention into the capacity control solenoid valve, a minute gap between the valve body and the valve housing can be obtained without increasing the capacity control solenoid valve. It is possible to prevent foreign matter from being caught in the solenoid, and as a result, it is not necessary to increase the thrust of the solenoid.

5 and 6 are front sectional views for explaining a case where the ring-shaped packing 3 having a substantially y-shaped cross section of the present invention is mounted on, for example, a solenoid valve for capacitance control, and the reference numerals shown in FIG. The same reference numerals indicate the same members. In this example, the enlarged diameter portion 17 for mounting the ring-shaped packing 3 on the inner surface of the valve housing 12 of the bottleneck 15 between the valve body 11 and the valve housing 12 and between the low pressure side 13 and the high pressure side 14. Is provided. As shown in FIG. 6, the diameter-expanded portion 17 has a shape in which the left side is connected to the bottleneck 15 and the right side is open.

To attach the ring-shaped packing 3, as shown in FIG. 5, the back portion of the ring-shaped packing 3 in an approximately y-shape is the high-pressure side 14 (left side in the figure), and the upper side is the diameter expansion of the inner surface of the valve housing 12. The ring-shaped packing 3 is arranged so as to face the portion 17, and the ring-shaped spacer 18 is arranged on the front side 19 having a substantially y-shaped cross section of the ring-shaped packing 3, and is pushed in from the right side (open side) by the pressing jig 20. After pushing, the pressing jig 20 is pulled out, leaving the ring-shaped spacer 18. Since it is necessary to continue to give an appropriate tightening allowance to the ring-shaped packing 3 after the ring-shaped spacer 18 is mounted, the ring-shaped spacer 18 is formed in a size such that it fits tightly with the inner surface of the enlarged diameter portion 17. Has been done. Note that FIG. 5 describes the case where the ring-shaped packing 3 is pushed from the low-pressure side 13, but when the ring-shaped packing 3 is pushed from the high-pressure side 14, the ring-shaped spacer 18 is on the side opposite to the front side 19 of the ring-shaped packing 3. Placed on the side.

In order to ensure low friction of the ring-shaped packing 3, it is necessary to control the tightening allowance of the ring-shaped packing 3, but this tightening allowance can be controlled by the built-in position of the ring-shaped spacer 18. it can. Therefore, although not shown, a device for controlling the pushing amount of the pressing jig 20 or the incorporating position of the ring-shaped spacer 18 to the target value is provided.

By controlling the tightening allowance, it is possible to precisely control the amount of protrusion of the ring-shaped packing 3 having a substantially y-shaped cross section inward. The appropriate amount of protrusion of the ring-shaped packing 3 having a substantially y-shaped cross section to the inside can be determined from the amount of seal leakage by conducting a test in which the amount of seal leakage is measured in advance while pressure is applied.

1 Outer member 2 Inner member 3 Ring-shaped packing 4 Approximately y-shaped back part 5 Ring-shaped groove 6 Upper section of approximately y-shaped cross section 7 Lower part of approximately y-shaped cross section 8 High-pressure side Space where fluid acts 9 Protrusion 10 Solenoid 11 Valve body 12 Valve housing 13 Low pressure side 14 High pressure side 15 Jig 16 Ring groove 17 Expanded diameter on the inner surface of valve housing 18 Ring spacer 19 Front side with approximately y-shaped cross section 20 Pressing cure Ingredients