Scroll-type compressor

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to, for example, a scroll compressor used in a refrigerating device, an air conditioner, etc., and is particularly suitable for lubrication of a scroll compressor used in a wide range of operating rotation speeds by inverter control or the like. Regarding technology.

【0002】

[Conventional technology]

Conventionally, in a scroll type compressor widely used for compressing refrigerant gas in a refrigerating device or an air conditioner, a scroll type compression mechanism is configured by providing a fixed scroll member, a swivel scroll member, and a rotation prevention mechanism. doing. In this scroll type compression mechanism, one fixed scroll member is an immovable scroll that is fixedly supported in a housing connecting a suction pipe and a discharge pipe. The other swivel scroll member is arranged in a state of being meshed with the fixed scroll member in the vertical or horizontal direction, is prevented from rotating by the rotation prevention mechanism, and is connected to a drive source such as an electric motor to form a fixed scroll member. On the other hand, it performs a revolving turning motion. This swivel scroll member contacts the fixed scroll member at a plurality of contact points to form a crescent-shaped compression chamber, and the compression chamber moves inward while reducing the volume from the outer peripheral side, thereby sucking, compressing, and compressing. Discharge can be performed at the same time.

【0003】

Further, also in the scroll type compressor, it is necessary to lubricate each sliding portion for the purpose of preventing seizure and cooling. For this reason, in the scroll type compressor, a storage portion for storing lubricating oil is conventionally provided at the bottom of the housing, and is provided on the rotating shaft or the like by, for example, a lubricating oil pump mechanism provided near the lower end of the rotating shaft of the electric motor. It is equipped with a lubrication system configured to supply lubricating oil to each sliding part from the upper end surface of the eccentric pin (drive pin) on the upper part of the rotating shaft through the oil passage.

【0004】

Hereinafter, as a conventional example, the configuration and lubrication system of the closed vertical scroll type compressor will be briefly described with reference to FIGS. 4 and 5. The scroll type compressor 1 includes a bottomed tubular housing 2, a scroll type compression mechanism 4 supported by an upper bearing 3 at the upper part of the housing 2, and a lower part of the scroll type compression mechanism 4, that is, the housing 2. A motor 5 of a driving means, which is supported and arranged by an upper bearing 3 or the like, is provided in the lower part of the inside, and the rotating shaft 6 of the motor 5 is connected to the lower part of the scroll type compression mechanism 4.

【0005】

In the housing 2, the lower end and the upper end of the tubular portion 2a are closed by the bottom portion 2b and the lid portion 2c, respectively, and the suction pipe 7 is connected to the tubular portion 2a in an internal and penetrating state, and to the lid portion 2c. The discharge pipe 8 forms a closed space connected to the inside in a protruding state. The scroll-type compression mechanism 4 has a swivel scroll in which a fixed scroll member 9 fixed to the upper bearing 3 and a swivel scroll in which a revolving swivel motion is enabled between the upper bearing 3 and the fixed scroll member 9 via a thrust bearing 10 are supported. The member 11 is provided with a rotation prevention mechanism 12 provided on the outer surface of the rotation scroll member 11 and comprising a well-known Oldham link or the like that allows the rotation scroll member 11 to rotate and prevent its rotation.

【0006】

The fixed scroll member 9 includes a fixed side end plate 9a, a spiral fixed side spiral body 9b erected on the inner surface of the fixed side end plate 9a, and a cylinder formed on the peripheral edge of the fixed side end plate 9a. A peripheral wall portion 9c is provided, and a tip seal 13 is fitted on the tip surface of the fixed-side spiral body 9b. In the fixed side end plate 9a, a discharge passage 14 is formed in a vertically penetrating state in the central portion thereof, and on the upper surface thereof, as a partition member for dividing the inside of the housing 2 into a high pressure chamber HR and a low pressure chamber LR. A discharge cover 15 is arranged. A discharge port 16 is open at the center of the discharge cover 15, and a discharge valve 17 for opening and closing the discharge port 16 is provided. In the high pressure chamber HR, the open end of the discharge pipe 8 is fixed in a penetrating state, and the discharge pipe 8 and the high pressure chamber HR are connected.

【0007】

Further, on the outer peripheral portion of the upper bearing 3, a fluid (hereinafter referred to as a compressible fluid) that is introduced into the housing 2 from the suction pipe 7 and is to be compressed is introduced to the fixed side end plate 9a and the fixed wall of the fixed scroll member 3. A suction port 18 leading to the inner surface side of 9c is formed. The suction port 18 is connected to a suction chamber 19 formed between the fixed scroll member 9 and the swivel scroll member 11. Therefore, the compressed fluid introduced into the housing 2 from the suction pipe 7 is sucked from the suction chamber 19 into the scroll type compression mechanism 4 through the suction port 18.

【0008】

The swirl scroll member 11 is a swirl that is meshed with a swirl side end plate 11a arranged so as to face the fixed side end plate 9a and a fixed side swirl body 9b erected on the inner surface of the swivel side end plate 11a. A swirling side spiral body 11b is provided, and a tip seal 13 is fitted on the tip surface of the swirling side spiral body 11b. A cylindrical boss 20 is erected on the outer surface of the swivel end plate 11a with the same axis, and a bush 21 is rotatably fitted inside the boss 20 via a swivel bearing 22. ing. Further, the bush 21 is formed with a through hole 21a eccentric from the axis inside the bush 21.

【0009】

The fixed scroll member 9 and the swivel scroll member 11 are 180 degrees so that the side surfaces of the fixed side spiral body 9b and the swivel side spiral body 11b are in line contact with each other at a plurality of places in a state of being eccentric to each other by a predetermined distance. It is meshed with a phase difference. Further, in this state, the tip seals 13 of the fixed side spiral body 9b and the swivel side spiral body 11b are in close contact with the inner surfaces of the swivel side end plate 11a and the fixed side end plate 9a, respectively, and as shown in FIG. Compression chambers P serving as closed spaces are formed at a plurality of locations having a point-symmetrical positional relationship with respect to the centers of the spiral body 9b and the swirl side spiral body 11b. The swivel scroll member 11 revolves in a state where the rotation of the upper bearing 3 and the fixed scroll member 9 fixed to the upper bearing 3 is prevented by the rotation prevention mechanism 12 provided with the well-known Oldham link. It is arranged so that it can be exercised.

【0010】

The rotary shaft 6 of the motor 5 is pivotally supported by an upper bearing 23 arranged on the inner peripheral surface of the upper bearing 3 and a lower bearing 24 located below the motor 5, and an eccentric pin 25 eccentric by a predetermined amount from the axis is provided. It is provided in a protruding state at the upper end. The eccentric pin 25 is inserted into the through hole 21a of the bush 21 and rotatably supports the bush 21. A balance weight that rotates integrally is fixed at an appropriate position such as the rotating shaft 6.

【0011】

The eccentric pin 25 and the rotary shaft 6 are formed with an oil passage 26 that penetrates them vertically, and a lubricating oil pump mechanism 27 is provided at the lower end of the rotary shaft 6. The lubricating oil pump mechanism 27 is connected to the lower end of the oil passage 26. Further, a lubricating oil storage portion 28 is provided at the bottom 2b of the housing 2, and a lubricating oil pump mechanism 27 at the lower end of the rotary shaft 6 is arranged in the lubricating oil of the storage portion 28. The reference numeral L in the figure indicates the oil level of the lubricating oil stored in the storage unit 28.

【0012】

Next, a method of compressing gas (compressible fluid) in the scroll type compressor 1 having the above configuration will be described. By driving the motor 5, the rotation of the rotary shaft 6 is transmitted to the swivel scroll member 11 via the eccentric pin 25, the bush 21, the swivel bearing 22 and the boss 20, and the swivel scroll member 11 is transmitted by the rotation prevention mechanism 12. A revolution turning motion is performed on the fixed scroll member 9 in a state where the rotation is prevented. At this time, the gas of the compressed fluid is supplied from the suction pipe 7 into the housing 2 to cool the motor 5, and is further supplied to the compression chamber P via the suction port 18 and the suction chamber 19.

【0013】

Then, the gas in the compression chamber P is transferred to the central portion while being compressed as the volume of the compression chamber P is reduced by the revolution rotation movement of the swivel scroll member 11. In this way, the further compressed gas pushes the discharge valve 17 open from the discharge passage 14 and the discharge port 16 and is discharged into the high pressure chamber HR, and is discharged from the high pressure chamber HR to the outside of the compressor by the discharge pipe 8. Be guided.

【0014】

Further, the lubricating oil stored in the storage portion 28 of the bottom 2b is sucked up by the lubricating oil pump mechanism 27 and discharged from the oil supply outlet 26a at the tip of the eccentric pin 25 through the oil passage 26, and is discharged from the bush 21 and the swivel bearing 22. And after lubricating the eccentric pin 25, it collects in the oil pool 29. Then, this lubricating oil is further supplied to each lubricating part such as the thrust bearing 10 and the rotation prevention mechanism 12 so as to overflow from the upper part of the oil pool 29, and after passing through each part to lubricate, the bottom of the housing 2 is stored. It is returned to part 28 and circulated repeatedly. Further, the lubricating oil in the storage section 28 is agitated by the rotation of the drive motor 5 to form a mist, and the oil supplied to each lubricating section such as the thrust bearing 10 and the rotation prevention mechanism 12 is a compressed fluid gas. Together, it is supplied to the compression chamber P via the suction port 18 and the suction chamber 19, lubricating the sliding portion in the scroll type compression mechanism 4 and sealing between the compression chambers P. Reference numeral 30 in the figure is an oil drain hole for discharging the lubricating oil in the oil pool 29 to the storage portion 28 at the bottom 2b.

【0015】

[Problems to be Solved by the Invention]

However, the above-mentioned conventional scroll compressor lubrication system has the following problems. That is, in the above-mentioned conventional lubrication system, mist-like lubricating oil is supplied into the scroll type compression mechanism 4 together with the compressed fluid such as the refrigerant gas sucked from the suction pipe 7. Therefore, for example, an inverter. When the motor 5 is operated as a drive source in a wide rotation speed region, the amount of lubricating oil that becomes mist-like due to agitation decreases in the region operated at a low rotation speed. Therefore, the amount of lubricating oil circulated in the system also decreases, and as a result, the amount of lubricating oil supplied to the scroll type compression mechanism 4 decreases, and the lubrication performance and sealing performance of the scroll type compression mechanism 4 also decrease. The decrease in the problem becomes a problem.

【0016】

Such a decrease in lubrication performance reduces the sealing function between the compression chambers P, which leads to a decrease in the performance of the scroll type compressor 1. Further, since the sliding portion between the fixed scroll member 9 and the swivel scroll member 11 lacks lubricating oil, there is a concern that seizure may occur in the worst case and the durability and reliability may be deteriorated. Further, the deterioration of the sealing property causes an increase in leakage of the compressed gas between a plurality of compression chambers, which causes a deterioration in performance.

【0017】

The present invention has been made in view of the above circumstances, and in a scroll type compressor having a variable operation speed, a scroll that can reliably lubricate and seal the inside of the scroll type compression mechanism even during low speed operation. The purpose is to provide a type compressor.

【0018】

[Means for solving problems]

The present invention employs the following means to solve the above problems. That is, in the scroll type compressor according to claim 1, the storage portion of the lubricating oil in the housing is provided in an atmosphere of high-pressure gas compressed by the scroll type compression mechanism, and the storage portion and the scroll type compression mechanism are provided. It is characterized in that it is connected to the inside by a lubricating oil supply flow path. According to the scroll type compressor according to claim 1, the lubricating oil in the storage part is directed to the suction port due to the pressure difference between the high pressure environment in the storage part and the pressure environment lower than the high pressure in the scroll type compression mechanism. You will be able to form a flow.

【0019】

Further, the scroll type compressor according to claim 2 is the scroll type compressor according to claim 1, which limits the flow rate of the lubricating oil discharged into the scroll type compression mechanism in the lubricating oil supply flow path. It is characterized by providing an oil amount control device for performing the above. According to the scroll type compressor according to claim 2, the lubricating oil from the storage unit to the scroll type compressor can be controlled to flow at the designed flow rate by passing through the oil amount control device. Will be.

【0020】

Further, in the scroll type compressor according to claim 3, in the scroll type compressor according to claim 2, the oil amount control device includes a plurality of orifices for reducing the flow rate of the lubricating oil in multiple stages. It is characterized by that. According to the scroll type compressor according to claim 3, the flow rate control for obtaining a desired lubricating oil flow rate can be performed with high accuracy and easily by combining the number of orifices and their pore diameters. become. Further, when forming the same pressure loss, it is better to form the same pressure loss through a plurality of orifices as in the present invention than to form the same pressure loss through a single orifice without making the orifice diameter per unit orifice extremely small. You will be done.

【0021】

Further, the scroll type compressor according to claim 4 is the scroll type compressor according to claim 3, wherein the oil amount control device temporarily removes the lubricating oil on the way from the storage unit to each of the orifices. The oil-retaining part is further provided with an oil-retaining part for collecting the oil and an oil-conducting pipe for guiding the lubricating oil of the oil-retaining part to each of the orifices. It is characterized in that it is inserted into the oil holding portion through the opening. According to the scroll type compressor according to claim 4, even if the refrigerant is dissolved in the lubricating oil taken into the oil-retaining part, it foams in the oil-retaining part to form bubbles and escapes through the opening vertically above. it can. As a result, it becomes possible to separate the lubricating oil and the air bubbles that go into the scroll type compression mechanism and control the amount of lubrication to be intended.

【0022】

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the scroll compressor of the present invention will be described below with reference to FIGS. 1 to 3, but it goes without saying that the present invention is not limited to this. Note that FIG. 1 is a view showing the scroll type compressor of the present embodiment, and is a cross-sectional view when viewed from a cross section including the axis of the rotating shaft. Further, FIG. 2 is a diagram showing an oil amount control device of the scroll type compressor, and is an enlarged view of part A in FIG. Further, FIG. 3 is a diagram showing a main part of the oil amount control device, and is an enlarged view of part B of FIG.

【0023】

As shown in FIG. 1, the scroll type compressor 31 of the present embodiment includes a bottomed tubular high-pressure housing 32, a scroll-type compression mechanism 34 supported by an upper bearing 33 at the upper part inside the high-pressure housing 32, and the like. A motor 35, which is a driving means supported and arranged by an upper bearing 33 or the like, is provided below the scroll type compression mechanism 34, that is, in the lower part of the housing 32, and the rotating shaft 36 of the motor 35 is scroll type compression. It is connected to the lower part of the mechanism 34.

【0024】

In the high-pressure housing 32, the lower end and the upper end of the tubular portion 32a are closed by the bottom portion 32b and the lid portion 32c, respectively, and the entire housing becomes a pressure vessel capable of withstanding high-pressure gas pressure compressed by the scroll type compression mechanism 34. ing. A suction pipe 37 for introducing the refrigerant gas to be compressed is connected to the cylinder portion 32a of the high-pressure housing 32 in a penetrating state with the inside of the scroll type compression mechanism 34, and further, the scroll type compression mechanism 34 is connected to the cylinder portion 32a. A discharge pipe 38 that guides the high-pressure refrigerant gas compressed by the above to the outside is connected, and one end thereof is opened in the high-pressure gas atmosphere in the high-pressure housing 32.

【0025】

The scroll type compression mechanism 34 can revolve and revolve through the thrust bearing surface 40 in a sealed space formed by the fixed scroll member 39 fixed to the upper bearing 33 and the upper bearing 33 and the fixed scroll member 39. A rotation prevention mechanism 42 provided on the outer surface of the rotation scroll member 41, which is provided on the outer surface of the rotation scroll member 41 and is composed of a well-known Oldham link or the like that prevents the rotation of the rotation scroll member 41 while allowing the revolution rotation motion. It has.

【0026】

The fixed scroll member 39 includes a fixed side end plate 39a, a spiral fixed side spiral body 39b erected on the inner surface of the fixed side end plate 39a, and a cylinder formed on the peripheral edge of the fixed side end plate 39a. Of these, the fixed side end plate 39a is provided with a peripheral wall portion 39c having a shape, and a discharge port 43 is formed in a vertically penetrating state at the center thereof, and a discharge valve 44 for opening and closing the discharge port 43 is provided. Has been done. Further, the suction pipe 37 is connected to the peripheral wall portion 39c, and the suction pipe 37 sucks the refrigerant gas to be compressed into the sealed space of the scroll type compression mechanism 34.

【0027】

The swirl scroll member 41 is a swirl that is erected on the inner surface of the swivel side end plate 41a arranged so as to face the fixed side end plate 39a and the swivel side end plate 41a and meshes with the fixed side swirl body 39b. It is equipped with a swirl side spiral body 41b. A cylindrical boss 45 is erected on the outer surface of the swivel side end plate 41a with the same axis, and a bush 46 is rotatably fitted inside the boss 45. A through hole eccentric from the axis of the rotating shaft 36 is formed inside the bush 46. Between the swivel scroll member 41 and the upper bearing 33, the swivel scroll member 41 is pressed against the fixed scroll member 39 at a pressure lower than high pressure and higher than the suction pressure, and the swivel scroll 41 and the fixed scroll 39 are pressed. A high-pressure partition seal 60 for forming a high-pressure chamber and an intermediate pressure partition seal member 61 for forming an intermediate pressure chamber are provided so as to seal each other in the axial direction.

【0028】

The fixed scroll member 39 and the swivel scroll member 41 are 180 degrees so that the side surfaces of the fixed side spiral body 39b and the swivel side spiral body 41b are in line contact with each other at a plurality of places in a state of being eccentric to each other by a predetermined distance. It is meshed with a phase difference. Further, in this state, the back pressure at which the tips of the fixed-side spiral body 39b and the swivel-side spiral body 41b press against the fixed scroll from the side opposite to the swirl-side spiral body on the inner surfaces of the swirl-side end plate 41a and the fixed-side end plate 39a, respectively. More closely, compression chambers P, which are closed spaces, are formed at a plurality of locations having a point-symmetrical positional relationship with respect to the centers of the fixed-side spiral body 39b and the swirl-side spiral body 41b. The swivel scroll member 41 revolves in a state where the rotation of the upper bearing 33 and the fixed scroll member 39 fixed to the upper bearing 33 is prevented by the rotation prevention mechanism 42 provided with the well-known Oldham link. It is arranged so that it can be exercised.

【0029】

The rotary shaft 36 of the motor 35 is pivotally supported by an upper bearing 33 and a lower bearing 60 located below the motor 35, and an eccentric pin 48 eccentric by a predetermined amount from the axis is provided at the upper end in a protruding state. There is. The eccentric pin 48 is inserted into the through hole of the bush 46 and rotatably supports the bush 46. A balance weight (not shown) that rotates integrally is fixed at an appropriate position such as the rotating shaft 36.

【0030】

The eccentric pin 48 and the rotary shaft 36 are formed with an oil passage 49 that penetrates them vertically, and a lubricating oil pump mechanism 50 is provided at the lower end of the rotary shaft 36. The lubricating oil pump mechanism 50 is connected to the lower end of the oil passage 49. Further, the bottom 32b in the housing 32, which is in the atmosphere of the refrigerant gas (high pressure gas) compressed by the scroll type compression mechanism 34, is provided with a storage section 51 for storing the lubricating oil. In a normal state in which a predetermined amount or more of lubricating oil is accumulated in 51, the lubricating oil pump mechanism 50 at the lower end of the rotating shaft 36 is located in the lubricating oil. L in the figure indicates the oil level of the lubricating oil.

【0031】

The scroll compressor 31 of the present embodiment adopts a configuration in which the storage unit 51 and the suction port SUC of the scroll compressor 34 are directly connected by a lubricating oil supply flow path 100. The lubricating oil supply flow path 100 communicates with the oil passage 49 (hereinafter, referred to as an oil passage 100a) whose lower end is opened so as to suck the lubricating oil in the storage portion 51 and the upper end opening of the oil passage 100a. , The gap flow path 100b between the inner surface of the recess of the boss 45 and the outer surface of the bush 46, and the upper bearing inner flow path 100c formed in the upper bearing 33 so as to communicate between the gap flow path 100b and the suction port SUC. A return flow path 100d for returning the surplus portion of the lubricating oil from the upper bearing inner flow path 100c to the suction port SUC to the storage section 51 is provided. An oil amount control device 200 that limits the flow rate of the lubricating oil discharged to the suction port SUC is connected to the lubricating oil supply flow path 100.

【0032】

As shown in FIG. 2, the oil amount control device 200 has an oil retention unit 201 that connects the upper bearing inner flow path 100c and the return flow path 100d, and an axis line vertically above the oil retention unit 201. The outer main body 202 and the inner main body 203 fixed so as to face each other, and a plurality of orifices 204 and packing 205 (see FIG. 3) held and fixed sandwiched between the outer main body 202 and the inner main body 203, and the inner side. It is configured with a strainer 206 fixed to the lower end of the main body 203.

【0033】

The oil holding portion 201 is a recessed space for temporarily storing lubricating oil on the way from the storage portion 51 to each orifice 204, and is formed in the upper bearing 33 with an opening 201a vertically above. There is. The outer main body 202 is a tubular body having male threads formed around it, and is screwed and fixed to female screw holes formed in the upper bearing 33. A discharge port 202a for discharging the lubricating oil whose flow rate has been adjusted is formed at the upper end of the outer main body 202. Reference numeral 40x shown in FIG. 2 is a through hole formed in the upper bearing 40 so as to lead the lubricating oil discharged from the discharge port 202a toward the scroll type compression mechanism 34 directly above.

【0034】

The inner main body 203 is an oil guide pipe that guides the lubricating oil of the oil retention portion 201 to each orifice 204, and a suction port 203b formed at the lower end thereof collects in the oil retention portion 201 through the opening 201a. It is inserted in the lubricating oil. Further, the inner main body 203 has a male screw formed around it, and is screwed and fixed to a female screw hole formed inside the outer main body 202. A flow path 203a is formed in the inner main body 203 in the vertical direction, and communicates with the discharge port 202a via each of the orifices 204 and the packing 205. The strainer 206 is provided at the suction port 203b, and serves to remove dust and the like contained in the suction oil to be sucked in and prevent clogging of each orifice 204.

【0035】

As shown in FIG. 3, each orifice 204 is a disk-shaped component having a hole for reducing the flow rate of the lubricating oil discharged toward the suction port SUC, and the orifice holes 204a are coaxially aligned. By interposing each of the packings 205, they are superposed in multiple stages at predetermined intervals. Each packing 205 is an elastic disk-shaped part with a hole, and serves as a sealing material for preventing the lubricating oil flowing through each orifice 204 from bypassing without passing through each orifice hole 204a. , A space 205a is secured between each orifice 204 with a hole diameter larger than that of the orifice hole 204a, and serves to stabilize the differential pressure between each orifice.

【0036】

Then, these orifices 204 and packing 205 are inserted into the outer main body 202 in a state of being alternately overlapped, and further, by screwing the inner main body 203 into the outer main body 202, the orifices and the packing 205 are separated from each other. It is intended to be tightly crimped.

【0037】

The lubricating oil supply conditions (discharge pressure, discharge flow rate, etc.) for the suction port SUC can be adjusted by the combination of the number of orifices 204 and the hole diameters of the orifice holes 204a, and can be controlled with high accuracy and easily. You can do it.

【0038】

Further, when forming the same pressure loss, forming through a plurality of orifices 204 as in the present invention does not make the orifice diameter per unit orifice extremely small, rather than forming through a single orifice. It is more preferable because it will be completed. This can be explained by the following mathematical formula (1). In this formula (1), Q is the flow rate of the lubricating oil, A is the flow path area of the orifice hole, C is the flow coefficient, ΔP is the pressure loss generated when passing through the orifice, and ρ is the density of the lubricating oil. ..

【0039】

[Number 1]

<img file="JP2003227480A_D0001.tif" />【0040】

In the above formula (1), in order to reduce the lubricating oil flow rate Q so that the lubricating oil sent from the storage unit 51 has a desired discharge amount, the flow path area A is reduced or the pressure loss is Δ. There are two ways to increase P. There is a work limit to reducing the flow path area A. Therefore, by providing the orifice 204 in multiple stages and adding a pressure loss ΔP each time it passes through each stage, an appropriate lubricating oil flow rate Q can be obtained without making the hole diameter of the orifice extremely small. It has become a thing. That is, when the number of orifices is n (n 2), ΔP in the above equation (1) becomes ΔP / n, and instead, the hole diameter of the orifice is n.^1/4Double. Therefore, it is possible to control the flow rate to a desired value without making the hole diameter of the orifice extremely small.

【0041】

According to the scroll type compressor 31 configured as described above, with respect to the fixed scroll member 39 in a state where the rotation scroll member 41 is prevented from rotating by the rotation prevention mechanism 42 by driving the motor 35. Performs a revolution turning motion. As a result, the refrigerant gas sucked from the suction pipe 37 into the compression chamber P is compressed as the volume decreases, and becomes a high-pressure refrigerant gas. This high-pressure refrigerant gas pushes the discharge valve 44 open from the discharge port 43, flows out into the high-pressure housing 32, fills the high-pressure housing 32, and is discharged from the discharge pipe 38 to the outside. At this time, the inside of the high-pressure housing 32 is in a high-pressure state that is the same as or almost the same as the discharge pressure of the scroll type compression mechanism 34, and this high pressure also acts on the lubricating oil liquid level L in the storage portion 51.

【0042】

On the other hand, the lubricating oil pump mechanism 50 sucks in the lubricating oil stored in the storage section 51 and sucks up the oil passage 100a, the gap flow path 100b, and the upper bearing inner flow path 100c in this order to suck up the oil retention section. Supply to 201. The pressure in the oil holding portion 201 is higher than the pressure at the suction port SUC of the scroll type compression mechanism 34 (a differential pressure is generated). Therefore, this differential pressure is used on the high pressure side. The lubricating oil in the oil retention unit 201 flows from a certain oil retention unit 201 toward the suction port SUC on the low pressure side so as to be pushed up. Therefore, the supply of the lubricating oil into the scroll type compressor 34 is stable regardless of the operating speed of the scroll type compressor 31, unlike the conventional supply of mist-like lubricating oil by stirring. ..

【0043】

More specifically, the lubricating oil pump mechanism 50 takes in lubricating oil from the storage unit 51 into the oil holding unit 201. At this time, the amount of lubricating oil that overflows from the oil holding section 201 due to the large amount of lubricating oil supplied is returned to the storage section 51 again via the return flow path 100d. The lubricating oil temporarily stored in the oil holding section 201 is supplied to each orifice 204 through the flow path 203a in the inner main body 203 by the action of the differential pressure. Since the lubricating oil at this time has passed through the strainer 206, dust and the like have been removed. Furthermore, even if air bubbles are dissolved in the lubricating oil taken into the oil retention unit 201, they foam in the oil retention unit 51 to form air bubbles, which can be released through the opening 201a vertically above, so that the suction port SUC can be used. It is possible to separate the heading lubricating oil and air bubbles and control the amount of lubrication to be intended.

【0044】

The flow rate of the lubricating oil from which bubbles and dust have been removed is adjusted by passing through each orifice 204, and the lubricating oil is supplied to the suction port SUC with an appropriate supply amount.

【0045】

In the scroll type compressor 31 of the present embodiment described above, the storage unit 51 provided in the atmosphere of high-pressure gas and the suction port SUC of the scroll type compression mechanism 34 are connected by a lubricating oil supply flow path 100. Adopted the configuration. According to this configuration, under any operating condition of the scroll type compressor 31, the flow of lubricating oil is formed by utilizing the pressure difference generated between the oil holding unit 201 and the suction port SUC. Even during low-speed operation, it is possible to reliably lubricate and seal the inside of the scroll type compression mechanism 34.

【0046】

Further, the scroll type compressor 31 of the present embodiment adopts a configuration in which the oil amount control device 200 is provided in the lubricating oil supply flow path 100. According to this configuration, it is possible to supply the lubricating oil adjusted to an appropriate flow rate. Further, in the present embodiment, the oil amount control device 200 adopts a configuration in which a plurality of orifices 204 are provided in multiple stages. According to this configuration, it is not necessary to make the hole diameter per unit orifice extremely small as compared with the case where the flow rate is controlled by one orifice, so that the flow rate control of the lubricating oil can be finely performed. In addition, since the holes are less likely to be clogged, it is possible to improve the reliability of the flow rate control.

【0047】

Further, in the scroll type compressor 31 of the present embodiment, the oil amount control device 200 further includes an oil retention unit 201 and an inner main body 203, and the oil retention unit 201 has an opening 201a vertically upward and the inner main body 203. The suction port 203b of the above is inserted into the oil holding portion 201 through the opening 201a. According to this configuration, it is possible to reduce the entry of air bubbles together with the lubricating oil that enters the suction port SUC of the scroll type compression mechanism 34, and it is possible to prevent a decrease in compression efficiency.

【0048】

In this embodiment, the flow control device 200 is provided in the upper bearing 33, but the present invention is not limited to this, and the flow control device 200 is connected to the fixed scroll member 39 side and connected to the suction port SUC from the fixed scroll member 39 side. A discharge configuration may be adopted. Further, a configuration in which the flow rate control device 200 and the storage unit 51 are directly connected by a pipe may be adopted. Further, the scroll type compressor 31 of the present embodiment is shown in the case where it has a high pressure seal and an intermediate pressure seal, but the present invention is not limited to this, and the present invention is applied to a scroll type compressor having only a high pressure seal. You may. Of course, the present invention may be applied not only to the refrigerant but also to a scroll type compressor that compresses other compressed fluids.

【0049】

[Effect of the invention]

The scroll type compressor according to claim 1 of the present invention adopts a configuration in which a storage portion provided in an atmosphere of high pressure gas and a suction port of a scroll type compression mechanism are connected by a lubricating oil supply flow path. did. According to this configuration, the flow of lubricating oil is formed by utilizing the pressure difference generated between the storage unit and the suction port under any operating condition of the scroll type compressor, and therefore, during low rotation speed operation. However, it is possible to reliably lubricate and seal the inside of the scroll type compression mechanism.

【0050】

Further, the scroll type compressor according to claim 2 adopts a configuration in which the oil amount control device is provided in the lubricating oil supply flow path in the scroll type compressor according to claim 1. According to this configuration, it is possible to supply the lubricating oil adjusted to an appropriate flow rate.

【0051】

Further, as the scroll type compressor according to claim 3, in the scroll type compressor according to claim 2, the oil amount control device adopts a configuration in which a plurality of orifices are provided in multiple stages. According to this configuration, it is not necessary to make the hole diameter per unit orifice extremely small as compared with the case where the flow rate is controlled by one orifice, so that the flow rate control of the lubricating oil can be finely performed. Further, since the holes are less likely to be clogged, it is possible to improve the reliability of the flow rate control.

【0052】

Further, the scroll type compressor according to claim 4 is the scroll type compressor according to claim 3, wherein the oil amount control device further includes an oil holding part and an oil conducting pipe, and the oil holding part is vertically upward. The structure is such that the suction port of the oil guide pipe is inserted into the oil holding portion through the opening. According to this configuration, it is possible to reduce the entry of air bubbles together with the lubricating oil that enters the suction port of the scroll type compression mechanism, and it is possible to prevent a decrease in compression efficiency.

[Simple explanation of drawings]

[Figure 1]

It is a figure which shows one Embodiment of the scroll type compressor of this invention, and is the cross-sectional view when viewed from the cross section including the axis of the rotating shaft.

[Figure 2]

It is a figure which shows the oil amount control device of the scroll type compressor, and is the enlarged view of the part A of FIG.

[Fig. 3]

It is a figure which shows the main part of the same oil amount control device of the same scroll type compressor, and is the enlarged view of the part B of FIG.

[Fig. 4]

It is a figure which shows an example of the conventional scroll type compressor, and is the cross-sectional view when viewed from the cross section including the axis of the rotating shaft.

[Fig. 5]

It is sectional drawing which shows the meshing state of the fixed scroll member and the swirl scroll member in the scroll type compression mechanism of the scroll type compressor.

[Explanation of symbols]

31 Scroll compressor 32 High pressure housing (housing) 34 Scroll type compression mechanism 51 Storage 100 Lubricating oil supply flow path 200 Oil amount control device 201 Oil retention department 201a Opening 203 Inner body (oil guide pipe) 203b Suction port 204 Orifice SUC Inhalation port