JPH1018988A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate lubricant oil used for a sliding part, by arranging a static pressure pocket in the sliding part, and connecting the static pressure pocket and a refrigerant liquid introducing circuit to each other through a throttle valve. SOLUTION: A plurality of groove-like static pressure pockets is formed in a thrust bearing 74 being a sliding part, throttles 202 are connected to the static pressure pockets, and refrigerant liquid passages 201 are connected to the throttles 202. A load exists in a part shifted from the center of the thrust bearing 74 to a static pressure pocket 203a side, so that a slewing scroll end plate 21 is made to be in a condition that it is floated form the thrust bearing 74 by the pressure of the static pressure pockets. Hereupon, a refrigerant amount led to flow out from the static pocket 203b is increased larger than the static pressure pocket 203a, howeve since the throttles 202 are connected to the static pressure pockets, the pressure of the static pressure pocket 203a is increased higher than that of the static pressure pocket 203b, and a gas compression load can be supported even though a load center does not exist in the center of the thrust bearing 74. That is, the floating rate and inclination of the end plate 21 are determined according to the magnitude of the load and the position of the load center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor applied to a refrigerating air conditioner.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing the configuration of a conventional refrigeration and air conditioning system using a refrigerant. This refrigerating air conditioner includes a compressor 91 as a fluid machine for transporting a refrigerant, a condenser 92, an expansion valve 93, an evaporator 94, and an accumulator 95. The high-temperature and high-pressure refrigerant gas discharged from the compressor 91 is condensed and liquefied by the condenser 92, decompressed by the expansion valve 93, then evaporated by the evaporator 94, and passed through the accumulator 95 to the compressor 9.
Return to 1.

Here, during cooling, heat generated by evaporation in the evaporator 94 is used, and during heating, a condenser 92 is used.
Refrigeration and air conditioning are performed using heat for liquefaction in the interior. The accumulator 95 is for selectively returning only refrigerant gas without returning refrigerant liquid to the compressor 91.

FIG. 10 is a longitudinal sectional view showing the structure of a conventional compressor. In FIG. 9, a conventional closed type refrigerating / air-conditioning scroll compressor which is an example of a refrigerant compressor used as a compressor 91 is shown. 1 shows the configuration. FIG. 10 is a vertical cross-sectional view of the scroll compressor, in which a compression element portion is disposed at an upper portion of the main body, and an electric motor is disposed at a lower portion. The compression element portion includes a fixed scroll 1, an orbiting scroll 2, and a rotation preventing member 3 that allows the orbiting of the orbiting scroll 2 and prohibits rotation.
Etc.

[0005] In addition to these, a drive shaft 5 connecting the electric motor 4 and the compression element portion, and a fixed scroll 1
And a frame 6 for locking the electric motor 4, an upper bearing 71 and a lower bearing 72 for supporting the drive shaft 5.
And a revolving bearing 73 for rotatably supporting the revolving scroll 2;
Thrust bearing 74 for supporting orbiting scroll 2 in the axial direction
And housed in the housing 8. A lubricating oil 81 is sealed in a lower part of the housing 8.

The fixed scroll 1 includes an end plate 11 and a spiral 12 integrally formed with the end plate 11. The end plate 11 has a discharge boat 13, a discharge valve 17, and a discharge positioned opposite to the spiral 12. A cavity 14 is provided. The orbiting scroll 2 includes an end plate 21 and a spiral 22 integrally formed with the end plate 21. Further, a boss 23 for driving the orbiting scroll 2 is provided on the opposite side of the spiral 22 from the end plate 21. Have been. This boss 23
A orbiting bearing 73 for connecting the drive shaft 5 and the orbiting scroll 2 is disposed at the center of the vehicle.

An eccentric pin 53 is integrally formed on the drive shaft 5, and the drive bush 5 is
4 is rotatably interposed. Drive bush 54
Is rotatably interposed in the orbiting bearing 73 provided on the boss 23 of the orbiting scroll 2. Note that a balance weight 84 is attached to the drive shaft 5.

Next, the flow of the refrigerant gas in the scroll compressor will be described. The low-temperature and low-pressure refrigerant gas returned to the compressor is introduced into the space inside the housing 8 through the suction pipe 82 and cools the electric motor 4. After that, it passes through a part of the outer periphery of the frame 6 and is introduced from a suction passage 15 provided in the fixed scroll 1 into a suction chamber 16 provided outside in the fixed scroll 1.

When the orbiting scroll 2 driven by the electric motor 4 is revolved by being restricted by the rotation preventing member 3, the hermetic seal formed by the spirals 12 and 22 provided on the fixed scroll 1 and the orbiting scroll 2, respectively. The space 24 reaches the center of the scroll while gradually reducing its volume. During this time, the pressure and temperature of the refrigerant gas increase with the decrease in the volume of the closed space 24, and the refrigerant gas is discharged from the discharge port 13 of the fixed scroll 1 to the discharge cavity 14 via the discharge valve 17. Is sent out of the compressor through a discharge pipe 83.

On the other hand, the lubricating oil 81 stored in the lower part of the housing 8 is supplied to the centrifugal pump 51 provided on the shaft 5.
Oil hole 52 eccentrically provided from the center of the shaft
Is partially supplied to the lower bearing 72. Further, the slewing bearing 7 is provided via the eccentric pin 53 of the drive shaft 5.
3. The lubrication of the thrust bearing 74 and the anti-rotation member 3 reaches the frame chamber 61 of the frame 6, and further, the lubrication of the upper bearing 71, and then is discharged from the oil drain hole 62 to the lower part of the housing 8. You.

[0011]

In the structure of the conventional compressor described above, the lubricating oil 81 is used for lubricating each sliding portion of the compressor. There is a problem like this. (1) Since a part of the lubricating oil 81 is sent out to the refrigerant air conditioner together with the refrigerant gas, it enters the condenser 92 and the evaporator 94 shown in FIG. (2) The refrigerant containing the lubricating oil has a larger flow pressure loss than the refrigerant alone, and a loss of the refrigeration / air-conditioning device is caused by the pressure loss. (3) Since the lubricating oil 81 is always present in the compressor, the refrigeration / air-conditioning system needs to perform a control operation for returning the lubricating oil present in the condenser 92, the evaporator 94 and the piping to the compressor from time to time. (4) Since the lubricating oil has a property of dissolving in the refrigerant, when the refrigeration / air-conditioning system is stopped for a long time, the refrigerant preferentially dissolves in the lubricating oil in the compressor, and the refrigerant liquid is discharged when the next compressor starts. Compressing the lubricating oil dissolved in a large amount may cause a strength problem in the compressor. The purpose of the present invention is
An object of the present invention is to provide a compressor that eliminates troubles caused by lubricating oil by eliminating the need for lubricating oil used for sliding parts.

[0012]

Means for Solving the Problems To solve the above problems and achieve the object, a compressor of the present invention is configured as follows. (1) The compressor of the present invention is mounted on a refrigeration / air-conditioning apparatus, and supplies refrigerant liquid liquefied in the apparatus to a sliding section of the compressor via a refrigerant liquid introduction circuit to lubricate the sliding section. In the compressor having a lubricating means, a static pressure pocket is provided in the sliding portion, and the static pressure pocket and the refrigerant liquid introduction circuit are connected via a throttle. (2) The compressor according to the present invention is the compressor according to the above (1), wherein the sliding portion is a thrust bearing portion or a journal bearing portion, and the static pressure pocket is provided on one of the sliding members. Provided. (3) The compressor of the present invention is the compressor according to the above (1) or (2), and the static pressure pocket is formed by a groove. (4) The compressor according to the present invention is the compressor according to any one of the above (1) to (3), wherein a plurality of the static pressure pockets are provided, and the throttle is provided independently of each other. (5) The compressor according to the present invention is the compressor according to any one of the above (1) to (4), and further includes a gas vent passage in the static pressure pocket.

As a result of taking the above-described measures, the following effects are produced. (1) According to the compressor of the present invention, the sliding portion is provided with a static pressure pocket, and the static pressure pocket and the refrigerant liquid introduction circuit are connected via the throttle. The movement can be performed lubricated. (2) According to the compressor of the present invention, the sliding portion forms a thrust bearing portion or a journal bearing portion, and the static pressure pocket is provided on one of the members sliding with each other. The sliding of the part or the journal bearing part can be performed lubricated. (3) According to the compressor of the present invention, since the static pressure pocket is formed by the groove, the gas compression load can be supported regardless of the load center of the sliding portion. (4) According to the compressor of the present invention, a plurality of the static pressure pockets are provided, and the restrictors are provided independently of each other.
The gas pressure can be adjusted by the throttle. (5) According to the compressor of the present invention, since the gas release passage is provided in the static pressure pocket, the pressure at that position can be reliably set to the atmospheric pressure.

[0014]

FIG. 1 is a diagram showing a configuration of a refrigeration / air-conditioning apparatus to which a compressor according to an embodiment of the present invention is applied. This refrigerating air conditioner includes a compressor 100 which is a fluid machine for transporting a refrigerant, a condenser (condenser) 92,
It is mainly composed of an expansion valve 93 and an evaporator (evaporator) 94. Further, a refrigerant liquid pipe 101 for returning a part of the refrigerant liquid in the condenser 92 to the compressor 100 is provided between the condenser 92 and the compressor 100.

The high-temperature and high-pressure refrigerant gas discharged from the compressor 100 is condensed and liquefied by a condenser 92,
After the pressure is reduced in 3, the refrigerant liquid evaporates in the evaporator 94 and returns to the compressor 100. During cooling, heat generated by evaporation in the evaporator 94 is used.
The point that refrigeration and air conditioning is performed using the heat for liquefaction in 2 is the same as the conventional case. A part of the refrigerant liquid condensed and liquefied by the condenser 92 is returned to the compressor 100 through the refrigerant liquid pipe 101, and the compressor 1
It is used for lubricating sliding parts such as a suction / discharge mechanism and a rotation drive mechanism in the 00.

FIG. 2 is a longitudinal sectional view showing the structure of the compressor 100. The refrigerant liquid introduced from outside through a refrigerant liquid pipe 101 as a refrigerant liquid introduction circuit is supplied to the suction / discharge mechanism and the rotation drive mechanism. FIG. 3 is a diagram showing a configuration of a compressor 100 provided with a liquid supply passage leading to a required sliding portion of FIG. In FIG. 2, the same parts as those in FIG. 10 are denoted by the same reference numerals.

A compression element portion is provided at an upper portion of the main body of the scroll compressor 100 shown in FIG. 2, and an electric motor is provided at a lower portion. The compression element portion includes a fixed scroll 1, a revolving scroll 2, a revolving scroll 2 and a rotation preventing member 3 that permits revolving of the revolving scroll 2 and prohibits revolving.

In addition to these, a drive shaft 5 for connecting the electric motor 4 and the compression element portion, a frame 6 for locking the fixed scroll 1 and the electric motor 4, an upper bearing 71 and a lower bearing 72 for supporting the drive shaft 5 And a thrust bearing 74 that supports the orbiting scroll 2 in the axial direction and a thrust bearing 74 that supports the orbiting scroll 2 in the axial direction. The housing 8 is not filled with lubricating oil unlike the conventional case.

The fixed scroll 1 includes an end plate 11 and a spiral 12 integrally formed with the end plate 11. The end plate 11 has a discharge port 13, a discharge valve 17, and a discharge positioned opposite to the spiral 12. A cavity 14 is provided. The orbiting scroll 2 includes an end plate 21 and a spiral 22 integrally formed with the end plate 21. Further, a boss 23 for driving the orbiting scroll 2 is provided on the opposite side of the spiral 22 with respect to the end plate 21. Have been. This boss 23
Further, a turning bearing 73 for connecting the drive shaft 5 and the turning scroll 2 is arranged.

An eccentric pin 53 is integrally formed on the drive shaft 5, and the drive bush 5 is
4 is rotatably interposed. Drive bush 54
Is rotatably interposed in the orbiting bearing 73 provided on the boss 23 of the orbiting scroll 2. Note that a balance weight 84 is attached to the drive shaft 5.

Hereinafter, differences between the compressor according to the present embodiment shown in FIG. 2 and the conventional compressor shown in FIG. 10 will be described.
In the thrust bearing 74, a refrigerant liquid passage 201 and a throttle 202 for guiding the refrigerant liquid from the refrigerant pipe 101 of FIG. 1 are formed. The lower end of the shaft 5 has a refrigerant pipe 101 shown in FIG.
A refrigerant liquid passage 300 for guiding the refrigerant liquid from
This refrigerant liquid passes through a refrigerant liquid passage 301 in the shaft 5,
The liquid is supplied to the upper bearing 71 and the lower bearing 72, and is supplied to the slewing bearing 73 through the throttle 302.

FIG. 3 is a longitudinal sectional view of a thrust bearing in the compressor according to the present embodiment, and FIG. 4 is a plan view of the thrust bearing. The thrust bearing 74 is shown in FIGS.
A plurality of groove-shaped static pressure pockets 203 are formed, and a throttle 202 is connected to each of the static pressure pockets 203, and a refrigerant liquid passage 201 is connected to the throttle 202.

FIG. 5 is a sectional view of a shaft or a drive bush of the compressor according to the present embodiment, and FIG. 6 is a developed view of the shaft or the drive bush. In the shaft 5 and the drive bush 54 shown in FIG. 2, a static pressure pocket 303 as shown in FIGS. 5 and 6 is formed in a groove shape at a portion sliding with the upper bearing 71, the lower bearing 72, and the swing bearing 73. I have. The throttles 302 are connected to the static pressure pockets 303, respectively, and further provided with a gas vent groove 304 communicating with the bearing end.

Next, the flow of the refrigerant gas in the scroll compressor shown in FIG. 2 will be described. Low temperature returned to the compressor
The low-pressure refrigerant gas is introduced into the space in the housing 8 through the suction pipe 82, cools the electric motor 4, passes through a part of the outer periphery of the frame 6, and passes through the suction passage 15 provided in the fixed scroll 1. It is introduced into a suction chamber 16 provided outside the fixed scroll 1.

Here, the orbiting scroll 2 driven by the electric motor 4 performs a revolving motion while being regulated by the rotation preventing member 3, and thereby the hermetic seal formed by the spirals 12 and 22 of the fixed scroll 1 and the orbiting scroll 2. Space 2
4 reaches the center of the scroll while gradually reducing the volume. During this time, the pressure and temperature of the refrigerant gas increase with the decrease in the volume of the closed space 24, and the refrigerant gas is discharged from the discharge port 13 of the fixed scroll 1 to the discharge cavity 14 via the discharge valve 17. Is sent out of the compressor via the discharge pipe 83.

At this time, the load due to the gas compression is applied to the thrust bearing 74 and the slewing bearing 73, and as a reaction thereto, is also applied to the upper bearing 71 and the lower bearing 72. The load applied to the thrust bearing 74 has a center of load at a position shifted from the center of the thrust bearing 74, and the position is synchronized with the rotation of the shaft and rotates around the center of the thrust bearing 74. Further, the slewing bearing 73, the upper bearing 71, the lower bearing 7
The direction applied to the load 2 also rotates in synchronization with the rotation of the shaft.

On the other hand, the refrigerant liquid introduced into the compressor 100 from the condenser 92 shown in FIG. 1 via the refrigerant liquid pipe 101 is divided into two systems, one of which is a refrigerant liquid passage 201 of the thrust bearing 74, a throttle 202, and a static liquid. Liquid is supplied to the thrust bearing 74 by the pressure pocket 203. The other is shaft 5
Through the refrigerant liquid passage 300 attached to the lower end of the shaft, the refrigerant liquid passage 301 in the shaft 5, the throttle 302, and the static pressure pocket 303.
Thus, liquid is supplied to the swing bearing 73, the upper bearing 71, and the lower bearing 72, respectively. After lubricating the bearings, the refrigerant liquid evaporates into refrigerant gas, is sucked into the compression part, and is sent out into the refrigerating air conditioner.

FIG. 7 is a view for explaining the principle of supporting the load of the thrust bearing 74. FIG. 7 shows two opposing static pressure pockets 203a and 203b. The load is shifted from the center of the thrust bearing 74 toward the static pressure pocket 203a. The orbiting scroll end plate 21 floats from the thrust bearing 74 due to the pressure of the static pressure pocket 203, and the floating amount of the orbiting scroll 203b is larger in the 203b than in the static pressure pocket 203a. Then
The amount of refrigerant flowing out of the static pressure pocket 203b is larger than the amount of refrigerant flowing out of the static pressure pocket 203b.
Since the throttle 202 is connected to 03, the pressure in the static pressure pocket 203a becomes higher than the pressure in 203b. Therefore, even if the load center is not at the center of the thrust bearing, the gas compression load can be supported. That is, the floating amount and inclination of the end plate 21 are determined according to the magnitude of the load and the position of the load center.

FIG. 8 is a diagram for explaining the principle of supporting the loads of the upper bearing 71, the lower bearing 72, and the swing bearing 73. Since this principle is common to the upper bearing 71, the lower bearing 72, and the turning bearing 73, the upper bearing 71 will be described as an example.

The static pressure pocket 30 provided on the shaft 5
3 is provided in substantially the same direction as the load direction. The shaft 5 floats by the static pressure pocket 303 of the upper bearing 71. However, when the floating amount increases, the static pressure pocket 303 increases.
The amount of refrigerant flowing out of the nozzle increases, and the pressure in the static pressure pocket 303 decreases due to the presence of the throttle 302. Conversely, as the flying height decreases, the pressure in the static pressure pocket 303 increases.

That is, the flying height is determined by the magnitude of the load, and the load can always be supported. Since the load direction is synchronized with the shaft rotation, the static pressure pocket 3
The number of 03 may be one, but may be plural.
When a static pressure pocket is provided on the bearing side instead of the shaft side, a plurality of static pressure pockets are required as in the thrust bearing. The gas vent groove 304 is provided in a direction substantially 180 ° opposite to the load direction, so that the pressure at that position is reliably set to the atmospheric pressure (low pressure).

It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications without departing from the scope of the invention. (Effects of Embodiment) According to the present embodiment, a refrigerant liquid introduction circuit for guiding a refrigerant liquid liquefied and cooled by a condenser in a refrigerating air conditioner to a sliding portion of a fluid machine such as a compressor is provided. By adopting a configuration that lubricates these sliding parts with liquid, the lubricating oil conventionally used becomes unnecessary,
All problems caused by using lubricating oil are eliminated.
That is, the following advantages can be obtained. (1) Lubricating oil does not lower the heat transfer characteristics of a capacitor, an evaporator, and the like. (2) The problem of increased pressure loss caused by the presence of the lubricating oil is eliminated. (3) The control operation in the refrigerating air conditioner for returning the lubricating oil to the compressor becomes unnecessary, and the original predetermined cooling and heating operations can always be performed. (4) When the refrigerating air conditioner is stopped for a long time, the lubricating oil preferentially melts into the lubricating oil in the compressor when lubricating oil is present. Compressing the oil can cause compressor strength problems, but these problems are fundamentally eliminated if no lubricating oil is used. (5) The oil pump conventionally provided in the compressor is not required, and the lubricating oil is not required, so that the compressor can be reduced in size and cost. At the same time, when lubricating oil is used, an accumulator, which was required for a refrigeration and air conditioning system, is not required.

(Summary of Embodiments)
The main point is to lubricate sliding parts of a fluid machine by introducing refrigerant liquid from a refrigeration / air-conditioning device. That is, in a refrigeration / air-conditioning apparatus using a refrigerant and having a fluid machine for conveying the refrigerant, the refrigerant liquid liquefied in the apparatus is supplied to a sliding portion of the fluid machine via a refrigerant liquid introduction circuit. Like that.

The thrust bearing is provided with a static pressure pocket, and the static pressure pocket is connected to the refrigerant introduction circuit via a throttle. Further, the static pressure pocket is constituted by a groove, a plurality of the static pressure pockets are provided, and an independent restrictor is provided for each of the static pressure pockets.

Further, a static pressure pocket is provided on a shaft sliding with a journal bearing (upper bearing / lower bearing) or a drive bush sliding with a slewing bearing, and the static pressure pocket and the refrigerant introduction circuit are connected via a throttle. Connected. Further, the static pressure pocket is constituted by a groove, and the shaft is provided with a gas vent groove communicating with a bearing atmosphere.

In this case, the refrigerant liquid introduction circuit is connected, for example, to a refrigerant liquid line of a condenser for condensing and liquefying the refrigerant in the refrigerating air conditioner. Further, in a fluid machine including a suction / discharge mechanism for sucking / discharging a refrigerant and a rotary drive mechanism for driving the suction / discharge mechanism, a refrigerant liquid introduced from outside via the refrigerant liquid introduction circuit is supplied to the suction / discharge mechanism. It has a discharge passage and a liquid supply passage leading to a required sliding portion of the rotary drive mechanism.

In this case, the accuracy of the refrigerant liquid is 0.1 mPaS
Therefore, a dynamic pressure bearing utilizing a dynamic pressure effect such as a wedge effect and a squeeze effect as in the case of using oil (on the order of 10 mPaS) is hardly established. Therefore,
Static pressure bearings using high-pressure refrigerant liquid are used.

As described above, in the refrigeration / air-conditioning apparatus of the present embodiment, the lubricating oil is introduced by guiding the refrigerant liquid liquefied in the refrigeration / air-conditioning apparatus to sliding parts of a fluid machine such as a compressor for lubrication. All conventional problems caused by use are solved. Further, in the fluid machine of the present embodiment, the refrigerant liquid introduced from the outside through the refrigerant liquid introduction circuit is sucked and discharged.
By providing the liquid supply passage leading to the required sliding portion of the discharge mechanism and the rotary drive mechanism for driving the same, the sliding portion can be lubricated by the refrigerant liquid.

[0039]

According to the present invention, it is possible to provide a compressor that eliminates the problem of lubricating oil by eliminating the need for lubricating oil used for sliding parts.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration / air-conditioning apparatus to which a compressor according to an embodiment of the present invention is applied.

FIG. 2 is a longitudinal sectional view showing a configuration of the compressor according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a thrust bearing in the compressor according to the embodiment of the present invention.

FIG. 4 is a plan view of a thrust bearing in the compressor according to the embodiment of the present invention.

FIG. 5 is a sectional view of a shaft or a drive bush of the compressor according to the embodiment of the present invention.

FIG. 6 is a development view of a shaft or a drive bush of the compressor according to the embodiment of the present invention.

FIG. 7 is a view for explaining the principle of supporting the load of the thrust bearing according to the embodiment of the present invention.

FIG. 8 is a view for explaining the principle of supporting loads on the upper bearing, the lower bearing, and the slewing bearing according to the embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a refrigeration / air-conditioning apparatus according to a conventional example.

FIG. 10 is a longitudinal sectional view showing a configuration of a compressor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed scroll 2 ... Orbiting scroll 3 ... Rotation prevention member 4 ... Electric motor 5 ... Drive shaft 6 ... Frame 8 ... Housing 11 ... End plate 12 ... Spiral 13 ... Discharge port 14 ... Discharge cavity 15 ... Suction passage 16 ... Suction chamber Reference Signs List 17 discharge valve 21 end plate 22 spiral 23 boss 24 sealed space 53 eccentric pin 54 drive bush 71 upper bearing 72 lower bearing 73 rotating bearing 74 thrust bearing 83 discharge pipe 84 balance weight 91 ... compressor 92 ... condenser 93 ... expansion valve 94 ... evaporator 95 ... accumulator 100 ... compressor 101 ... refrigerant liquid piping 201 ... refrigerant liquid passage 202 ... throttle 203 ... static pressure pocket 300 ... refrigerant liquid passage 301 ... refrigerant liquid passage 302 ... throttle 303 ... static pressure pocket 304 ... gas vent groove

Claims (5)

[Claims] The present invention has a lubricating means mounted on a refrigerating air conditioner for supplying a refrigerant liquid liquefied in the apparatus to a sliding portion of a compressor through a refrigerant liquid introduction circuit and lubricating the sliding portion. In the compressor, a static pressure pocket is provided in the sliding portion, and the static pressure pocket and the refrigerant liquid introduction circuit are connected via a throttle. 2. The compressor according to claim 1, wherein the sliding portion is a thrust bearing portion or a journal bearing portion, and the static pressure pocket is provided on one of the sliding members. 3. The compressor according to claim 1, wherein said static pressure pocket is formed by a groove. 4. The apparatus according to claim 1, wherein a plurality of said static pressure pockets are provided, and said restrictors are provided independently of each other.
A compressor according to any one of claims 1 to 3. 5. The compressor according to claim 1, wherein a gas vent passage is provided in said static pressure pocket.