CN111255707A

CN111255707A - A kind of compressor

Info

Publication number: CN111255707A
Application number: CN202010255482.0A
Authority: CN
Inventors: 吕鹏; 曹施鹏; 林伟伟; 冯凯
Original assignee: Shanghai Youshe Power Technology Co ltd
Current assignee: Shanghai Youshe Power Technology Co ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-06-09

Abstract

The invention relates to a compressor, which belongs to the technical field of compressors and comprises an end cover, a shell, a double-shaft extension motor, a first volute, a first impeller, a second volute and a second impeller, wherein the second end of the shell is closed, the first end of the shell is communicated with the second end of the shell, the end cover covers the first end of the shell, the double-shaft extension motor is installed in the shell, a rotating shaft of the double-shaft extension motor extends out of the end cover and the second end of the double-shaft extension motor, the first impeller and the second impeller are respectively and detachably installed at two ends of the rotating shaft, the first volute is detachably installed on the end cover to form a first compression cavity, the second volute is detachably installed at the second end to form a second compression cavity, the first impeller and the second impeller are respectively located in the first compression cavity and the second compression cavity, a first air inlet and a first air outlet are formed in the first volute, a second air. This compressor can realize the second grade compression to gaseous, simple structure, compactness, and first impeller and second impeller all are convenient for the dismouting, and are with low costs.

Description

A kind of compressor

Technical Field

The invention belongs to the technical field of compressors, and particularly relates to a compressor.

Background

The fuel cell is a device for converting chemical energy of hydrogen and oxygen into electric energy through electrode reaction, the oxygen pressure in the fuel cell has a direct relation with the performance of a fuel cell system, higher-pressure compressed air can increase the energy density of the fuel cell system and improve the efficiency of a cell stack, and the core part of an air supply system of a fuel cell engine is an air compressor.

In order to obtain a better gas compression effect, a two-stage compressor is appeared in the prior art, and gas compressed by a first stage is introduced into a second stage compression system for secondary compression, but the two-stage compressor in the prior art has a complex structure and a large volume, and an impeller for compressing gas on the compressor is not convenient to disassemble and assemble from the compressor, so that the replacement and maintenance of the impeller and the model conversion of the compressor are very difficult.

Disclosure of Invention

The invention provides a compressor, which is used for solving the technical problems that a two-stage compressor in the prior art is complex in structure, large in size and inconvenient to take down an impeller.

The invention is realized by the following technical scheme: a compressor comprising an end cap and a shell having a first end and a second end, said first end being through-penetrating and said second end being closed, said end cap capping said first end;

the double-shaft stretching motor is arranged in the motor mounting cavity, one end of a rotating shaft of the double-shaft stretching motor is rotatably inserted on the end cover and extends out of the end cover, and the other end of the rotating shaft of the double-shaft stretching motor is rotatably inserted on the second end and extends out of the second end;

still include first impeller, first spiral case, second impeller and second spiral case, first spiral case demountable installation on the end cover and this first spiral case with form first compression chamber between the end cover, first impeller demountable installation stretches out in the pivot of end cover and lie in first compression chamber, be equipped with first air inlet and first gas outlet on the first spiral case, second spiral case demountable installation is in the second is served and this second spiral case with form second compression chamber between the second end, second impeller demountable installation stretches out in the pivot of second end and lie in the second compression chamber, be equipped with second air inlet and second gas outlet on the second spiral case, first gas outlet pass through the trachea with the second air inlet intercommunication.

Furthermore, in order to better realize the invention, a spiral water tank surrounding the motor installation cavity is arranged on the outer wall of the shell;

the spiral water tank is characterized by further comprising a shaft sleeve, the shell is inserted into the shaft sleeve, the outer wall of the shell is attached to the inner wall of the shaft sleeve, the shaft sleeve is sleeved outside the spiral water tank, a water inlet hole and a water outlet hole are formed in the shaft sleeve, and the water inlet hole and the water outlet hole are communicated with the spiral water tank.

Furthermore, in order to better realize the invention, two sealing ring installation grooves for installing sealing rings are arranged on the outer wall of the shell, the spiral water tank is positioned between the two sealing ring installation grooves, and the shaft sleeve is sleeved outside the two sealing ring installation grooves.

Furthermore, in order to better realize the invention, the shell is also provided with two water leakage grooves, the two sealing ring mounting grooves and the spiral water groove are both positioned between the two water leakage grooves, the shaft sleeve is sleeved outside the two water leakage grooves and is provided with two water leakage holes, and the two water leakage holes are communicated with the two water leakage grooves in a one-to-one correspondence manner.

Furthermore, in order to better realize the invention, a first hole communicated with the motor installation cavity is arranged on the shell, the first hole is communicated with the first air outlet through a pipeline, and a second hole for allowing air in the motor installation cavity to flow out is also arranged on the shell.

Furthermore, in order to better implement the present invention, the second hole includes a hole a disposed on the side wall of the motor mounting cavity, and the hole a and the first hole are respectively located at two ends of the motor mounting cavity;

a first annular groove and a second annular groove are formed in the inner wall of the shaft sleeve and are respectively arranged at two ends of the shaft sleeve, a straight hole is further formed in the side wall of the shaft sleeve, and the straight hole is communicated with the first annular groove and the second annular groove;

the first annular groove is communicated with the hole A, and a hole B penetrating through the outer wall of the shaft sleeve is formed in the groove wall of the second annular groove.

Further, in order to better implement the present invention, the second end is provided with a second bearing chamber, a second radial air foil bearing and a thrust bearing for axial limiting of the rotating shaft are installed in the second bearing chamber, the rotating shaft is inserted into the second radial air foil bearing and the thrust bearing, and the thrust bearing and the end cover are respectively arranged on two sides of the second end.

Further, in order to better implement the present invention, the second hole further includes a hole C for communicating the second bearing chamber with the motor mounting cavity, and a hole D for allowing the gas in the second bearing chamber to flow out, the hole C is disposed on the second end, and the hole D is disposed on a side wall of the second bearing chamber.

Further, in order to better implement the present invention, a first bearing chamber is disposed on the end cap, a first radial air foil bearing is installed in the first bearing chamber, and the rotating shaft is inserted into the first radial air foil bearing.

Further, in order to better implement the present invention, sealing sleeves for sealing are installed at the first bearing chamber and the second bearing chamber, and the rotating shaft passes through the sealing sleeves.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a compressor, which comprises an end cover, a shell and a double-shaft extension motor, wherein the shell is provided with a first end and a second end, the first end is communicated, the second end is closed, the end cover is covered on the first end, the double-shaft extension motor is arranged in the shell, one end of the double-shaft extension motor is rotatably inserted on the end cover and extends out of the end cover, a first impeller is detachably arranged on the extending section, the other end of the double-shaft extension motor is rotatably inserted on the second end and extends out of the second end, a second impeller is detachably arranged on the extending section, the first volute is detachably arranged on the end cover and covers outside the first impeller, a second volute is detachably arranged on the second end and covers outside the second impeller, the first volute is provided with a first air inlet and a first air outlet, the second volute is provided with a second air inlet and a second air outlet, the first air outlet is communicated with the second air inlet by using an air pipe, by adopting the structure, when the double-shaft extension motor is electrified to operate, the rotating shaft rotates to drive the first impeller and the second impeller to synchronously rotate, the first impeller rotates in the first compression cavity between the end cover and the first volute so as to compress gas entering from the first gas inlet, then the gas is sent out from the first gas outlet, then the gas passes through the gas pipe to reach the second gas inlet, then the gas passes through the second impeller rotating in the second compression cavity between the second end and the second volute to be secondarily compressed, and finally the gas is discharged from the second gas outlet on the second volute, so that the gas pressure obtained after the compressor is compressed is higher, the structure of the whole compressor is simpler and more compact, the first volute and the second volute are exposed outside the shell and are convenient to disassemble and assemble, and the first impeller and the second impeller can be rapidly disassembled and assembled after the first volute and the second volute are disassembled so as to be replaced in time, And (7) maintenance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a compressor in an embodiment of the present invention;

FIG. 2 is an exploded view of the structure shown in FIG. 1;

FIG. 3 is another perspective view of the structure shown in FIG. 1;

FIG. 4 is an exploded view of the structure shown in FIG. 3;

FIG. 5 is another perspective view of the structure shown in FIG. 3;

FIG. 6 is a sectional view A-A of FIG. 5;

FIG. 7 is another view of the structure shown in FIG. 5 (without the first impeller and the second impeller shown);

FIG. 8 is a cross-sectional view B-B of FIG. 7;

FIG. 9 is a partial enlarged view of the area C in FIG. 8;

FIG. 10 is another perspective view of the structure shown in FIG. 5;

FIG. 11 is a cross-sectional view D-D of FIG. 10;

FIG. 12 is a schematic structural view of a housing in an embodiment of the invention;

FIG. 13 is another perspective view of the structure shown in FIG. 12;

FIG. 14 is another perspective view of the structure shown in FIG. 13;

FIG. 15 is a schematic structural view of a bushing in an embodiment of the invention;

FIG. 16 is another perspective view of the structure shown in FIG. 15;

fig. 17 is another perspective view of the structure shown in fig. 16.

In the figure:

1-end cap;

2-a housing; 21-a first hole; 22-A hole; 23-C hole; 24-D pores;

3-a second end;

4, a double-shaft extension motor; 41-a rotating shaft;

5-a first impeller;

6-a first volute; 61-a first air inlet; 62-a first outlet port;

7-a second impeller;

8-a second volute; 81-a second air inlet; 82-a second air outlet;

9-a spiral water tank;

10-shaft sleeve; 101-a water inlet hole; 102-water outlet; 103-water leakage holes; 104-a first annular groove; 105-a second annular groove; 106-straight hole; 107-B hole;

11-a seal ring mounting groove;

12-a water leakage tank;

13-a second radial air foil bearing;

14-a thrust bearing;

15-a first radial air foil bearing;

16-sealing sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1:

the present embodiment provides a compressor, which includes an end cover 1 and a shell 2, the shell 2 is a cylindrical shell, the shell 2 has a first end and a second end 3, it is noted that the first end and the second end 3 are two ends of the cylindrical shell, wherein the first end is through, the second end 3 is closed, the end cover 1 is covered at the first end, it should be noted that, the connection manner between the end cover 1 and the first end wall of the shell 2 is a detachable fixed connection, for example, the end cover 1 is mounted on the first end wall by using a screw and enables the end cover 1 to plug the first end.

This compressor still includes the biax and stretches motor 4, and this biax stretches motor 4 and includes stator and pivot 41, and wherein, pivot 41 rotates to be installed in the stator and the both ends of this pivot 41 all stretch out above-mentioned stator and form the biax and stretch the structure. The cavity formed between the end cover 1 and the second end 3 is a motor installation cavity, one end of the rotating shaft 41 of the biaxial stretching motor 4 is rotatably inserted into the end cover 1, the rotating shaft 41 extends out of the end cover 1, and the other end of the rotating shaft 41 is rotatably inserted into the second end 3 and extends out of the second end 3, that is, two ends of the rotating shaft 41 of the biaxial stretching motor 4 respectively extend out of the end cover 1 and the second end 3, and the rotating shaft 41 can freely rotate.

The compressor further comprises a first impeller 5 and a first volute 6, said first volute 6 being a housing, the first volute 6 is detachably mounted on the end cover 1 by means of screws and is located at a side far from the second end 3, a first compression chamber is formed between the first volute 6 and the end cover 1, the first impeller 5 is detachably mounted on a section of the rotating shaft 41 extending out of the end cover 1, and the first impeller 5 is located in the first compression chamber, the first impeller 5 is connected with the rotating shaft 41 in a key joint mode, and the central axis of the first impeller 5 is collinear with the central axis of the rotating shaft 41, thus, when the double-shaft extension motor 4 is electrified to operate, the first impeller 5 is driven to rotate in the first compression cavity, the first volute 6 is provided with a first air inlet 61 and a first air outlet 62, and when the compressor operates, air enters the first compression chamber from the first air inlet 61, is compressed by the first impeller 5, and then is discharged from the first air outlet 62. In the structure, because the first volute 6 is arranged at one end of the shell 2, the first volute 6 can be quickly disassembled and assembled, the first impeller 5 is also arranged outside the shell 2, and the first impeller 5 can be quickly disassembled and assembled after the first volute 6 is disassembled, so that the first impeller 5 can be timely replaced or maintained.

The compressor further includes a second impeller 7 and a second volute 8, the second volute 8 is a housing, the second volute 8 is detachably mounted on the second end 3 through a screw and is located at a side far from the end cover 1, a second compression cavity is formed between the second volute 8 and the second end 3, the second impeller 7 is detachably mounted on a section of the rotating shaft 41 extending out of the second end 3, and the second impeller 7 is located in the second compression cavity, it should be noted that, a connection mode between the second impeller 7 and the rotating shaft 41 is a key joint, and a central axis of the second impeller 7 is collinear with a central axis of the rotating shaft 41, so when the dual-shaft extension motor 4 is powered on, the second impeller 7 is driven to rotate in the second compression cavity, the second volute 8 is provided with a second air inlet 81 and a second air outlet 82, the second air inlet 81 is communicated with the first air outlet 62 through an air pipe, thus, the compressed gas from the first outlet port 62 will enter the second compression chamber and be further compressed by the second impeller 7 and finally discharged from the second outlet port 82, so that the pressure of the gas discharged from the second outlet port 82 is higher. In the structure, the second volute 8 is positioned at the end part of the shell 2, so that the second volute 8 can be quickly disassembled and assembled, the second impeller 7 is also positioned outside the shell 2, and the second impeller 7 can be quickly disassembled and assembled after the second volute 8 is disassembled, so that the second impeller 7 can be replaced or maintained in time.

The compressor of this kind of structure, it can realize the second grade compression to gas to export the gas of higher pressure, and its simple structure, compactness are convenient for moreover as required quick replacement first impeller 5 and the 7 models of second impeller, and the practicality is strong, makes things convenient for the volume production of compressor, reduce cost.

As a more preferable embodiment of this embodiment, in this embodiment, a second bearing chamber is disposed on the second end 3, a second radial air foil bearing 13 and a thrust bearing 14 are installed in the second bearing chamber, the second radial air foil bearing 13 and the thrust bearing 14 are disposed coaxially, the rotating shaft 41 of the dual-shaft extension motor 4 is inserted into the second radial air foil bearing 13 and the thrust bearing 14, the second radial air foil bearing 13 can radially bear a force on the rotating shaft 41, and the second radial air foil bearing 13 does not directly contact with the rotating shaft, so as to reduce wear. The thrust bearing 14 is used for axially positioning, limiting and bearing the rotating shaft 4, and reducing the axial offset of the rotating shaft 41.

In addition, a first bearing chamber is arranged on the end cover 1, a first radial air foil bearing 15 is arranged in the first bearing chamber, the rotating shaft 41 is also inserted in the first radial air foil bearing 15, and it should be noted that the first radial air foil bearing 15 is also an air foil bearing, so that the direct contact between the rotating shaft 41 and the end cover 1 can be avoided, the rotating shaft 41 can rotate more flexibly, and the rotating shaft 41 can not be in direct contact with the first radial air foil bearing 15 by virtue of the characteristics of the air foil bearing, thereby reducing the abrasion of the rotating shaft 41. Preferably, the first radial air foil bearing 15 and the second radial air foil bearing 13 are interchangeable.

With the above structure, in the compressor provided in this embodiment, the first radial air foil bearing 15, the thrust bearing 14, and the second radial air foil bearing 13 are all convenient to replace, which facilitates mass production of the compressor.

As a best mode of the present embodiment, in the present embodiment, sealing sleeves 16 for sealing are installed in the first bearing chamber and the second bearing chamber, specifically, the sealing sleeves 16 are installed at the end far away from the double-shaft extension motor 4, the sealing sleeves 16 at the second end 3 are flush with the housing 2, and the sealing sleeves 16 at the end cover 1 are flush with the end cover 1, so as to further enhance the compactness of the structure. Sealing boot 16 prevents gas leakage from the first bearing chamber on end cap 1 and the second bearing chamber at second end 3.

Example 2:

as a more preferable implementation manner of embodiment 1, in the compressor provided in this embodiment, a spiral water tank 9 surrounding the motor installation cavity is further disposed on an outer wall of the housing 2, and cooling liquid such as cooling water or cooling liquid may be introduced into the spiral water tank 9, so as to cool a cavity wall of the motor installation cavity, so as to implement an effect of cooling the dual-axis motor 4.

The compressor provided by the embodiment further comprises a shaft sleeve 10, the housing 2 is inserted into the shaft sleeve 10, the outer wall of the shaft sleeve 10 is attached to the inner wall of the housing 2, and the shaft sleeve 10 is sleeved outside the spiral water tank 9, so that the inner wall of the shaft sleeve 10 and the spiral water tank 9 form a spiral flow channel for circulation of cooling liquid, the shaft sleeve 10 is further provided with a water inlet hole 101 and a water outlet hole 102, and the water inlet hole 101 and the water outlet hole 102 are both communicated with the spiral water tank 9. Preferably, the water inlet 101 is disposed at a spiral start end of the spiral water tank 9, and the water outlet 102 is disposed at a spiral end of the spiral water tank 9.

In a preferred embodiment of the present invention, two gasket mounting grooves 11 are formed in an outer wall of the housing 2, the gasket mounting grooves 11 are used for mounting a gasket (not shown), and the spiral water tank 9 is located between the two gasket mounting grooves 11. Moreover, the shaft sleeve 10 is also sleeved outside the two seal ring mounting grooves 11, and when the seal rings are mounted in the seal ring mounting grooves 11, the shaft sleeve 10 compresses the seal rings. By adopting the structure, the sealing rings are arranged at the two ends of the spiral water tank 9, so that the cooling liquid overflowing the spiral water tank 9 can be prevented from leaking out from the two sides of the spiral water tank 9.

In a preferred embodiment of the present invention, two water leakage grooves 12 are further provided in the housing 2, the water leakage grooves 12 are annular grooves coaxial with the housing 2, the two gasket mounting grooves 11 and the spiral water groove 9 are located between the two water leakage grooves 12, and when the gasket is damaged, the cooling liquid flows into the water leakage grooves 12. Above-mentioned axle sleeve 10 also overlaps outside two basin 12 that leak to be equipped with two holes 103 that leak on axle sleeve 10, two holes 103 that leak switch on with two basin 12 one-to-ones that leak, like this, the cooling liquid that gets into in the basin 12 that leaks can derive through the hole 103 that leaks, thereby further avoids the cooling liquid to flow out in the clearance between axle sleeve 10 and the shell 2, further plays the effect of leak protection.

Example 3:

in this embodiment, as a more preferable implementation manner of the above embodiment, in this embodiment, the housing 2 is further provided with a first hole 21 communicated with the motor installation cavity, the first hole 21 is communicated with the first air outlet 62 through a pipeline, and a part of air coming out from the first air outlet 62 enters the first hole 21 through the pipeline and finally enters the motor installation cavity, so as to cool the dual-shaft extension motor 4 in the motor installation cavity, thereby further improving the cooling effect of the dual-shaft extension motor 4.

In this embodiment, the housing 2 is further provided with a second hole, the second hole is also communicated with the motor mounting cavity and is used for guiding out the gas in the motor mounting cavity, so that the gas pressure in the motor mounting cavity is prevented from being too high.

Example 4:

as a specific implementation manner of embodiment 3, in the compressor provided in this embodiment, the second hole includes the a hole 22, the a hole 22 is disposed on the side wall of the motor mounting cavity, and the a hole 22 and the first hole 21 are respectively disposed at two ends of the motor mounting cavity, so that the a hole 22 and the first hole 21 are respectively located at two ends of the stator of the biaxial stretching motor 4, and thus, the gas entering from the first hole 21 will pass through the inside of the biaxial stretching motor 4 to cool the inside of the biaxial stretching motor 4, and then reach the a hole 22, and get out of the motor mounting cavity through the a hole 22, so that the cooling effect on the biaxial stretching motor 4 can be further enhanced.

The shaft sleeve 10 is sleeved outside the hole a 22, a first annular groove 104 and a second annular groove 105 are respectively arranged at two ends of the shaft sleeve 10, a straight hole 106 is also provided in the side wall of the sleeve 10, through which hole 106 the first annular groove 104 and the second annular groove 105 are in communication, it being noted that, the straight hole 106 crosses the spiral water tank 9, the first annular groove 104 is positioned at one side close to the a hole 22 and is opposite to and communicated with the a hole 22, the air flow coming out of the a hole 22 enters the first annular groove 104, then enters the straight hole 106, then enters the second annular groove 105, the second annular groove 106 is located on the side close to the first hole 21, during which the gas flowing through the straight hole 106 will cool the sleeve 10, thereby cooling the cooling liquid flowing in the spiral water tank 9, and the cooling effect of the double-shaft extension motor 4 is better. A B hole 107 penetrating the outer wall of the sleeve 10 is formed in a wall of the second annular groove 105, so that gas introduced into the second annular groove 105 is discharged from the B hole 107 to the outside of the compressor. Specifically, the first hole 21 is provided in the housing 2 at a position near the second end 3, the B hole 107 is provided in the boss 10 at a position near the second end 3, and the a hole 22 is provided in the housing 2 at a position near the end cap 3. Preferably, the number of the holes a 22 is six, six holes a 22 are distributed on the housing 2 in an array with the central axis of the housing as the central circular axis, the number of the straight holes 106 is also six, and six straight holes 106 are distributed in the side wall of the shaft sleeve 10 in an array with the central axis of the shaft sleeve 10 as the central circular axis, so as to achieve a better flow guiding effect.

As a more preferable embodiment of this embodiment, in this embodiment, the second hole further includes a C hole 23 and a D hole 24, the second bearing chamber and the motor mounting cavity are respectively located at two sides of the second end 3, the C hole 23 is disposed at the second end 3, and the C hole 23 communicates the motor mounting cavity and the second bearing chamber, so that a part of the gas entering the motor mounting cavity from the first hole 21 will flow into the second bearing chamber through the C hole 21 to cool the thrust bearing 14 and the second radial air foil bearing 13 in the second bearing chamber, so as to improve the stability of the compressor in this embodiment. The D-hole 24 is disposed on the sidewall of the second bearing chamber to guide the gas in the second bearing chamber to the surrounding environment, thereby preventing the gas pressure in the second bearing chamber from being too high. Optimally, the number of the C holes 23 is 12, and the 12C holes 23 are distributed on the second end 3 in a circular shaft array with the central axis of the housing 2 as the center, thereby achieving a better flow guiding effect.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A compressor, characterized by: the device comprises an end cover and a shell with a first end and a second end, wherein the first end penetrates through the shell, the second end is closed, and the end cover covers the first end;

2. A compressor according to claim 1, wherein: a spiral water tank surrounding the motor installation cavity is arranged on the outer wall of the shell;

3. A compressor according to claim 2, wherein: the outer wall of the shell is provided with two sealing ring mounting grooves for mounting sealing rings, the spiral water groove is positioned between the two sealing ring mounting grooves, and the shaft sleeve is sleeved outside the two sealing ring mounting grooves.

4. A compressor according to claim 3, wherein: still be equipped with two water leakage grooves on the shell, two the sealing washer mounting groove and spiral water groove all is located two between the water leakage groove, the axle sleeve cover is two outside the water leakage groove and this axle sleeve is equipped with the hole that leaks, the quantity in hole that leaks is also two, two the hole that leaks switches on with two the water leakage groove one-to-one.

5. A compressor according to any one of claims 2-4, characterized in that: the shell is provided with a first hole communicated with the motor installation cavity, the first hole is communicated with the first gas outlet through a pipeline, and the shell is further provided with a second hole for allowing gas to flow out of the motor installation cavity.

6. A compressor according to claim 5, wherein: the second hole comprises a hole A arranged on the side wall of the motor installation cavity, and the hole A and the first hole are respectively positioned at two ends of the motor installation cavity;

7. A compressor according to claim 6, wherein: the second end is provided with a second bearing chamber, a second radial air foil bearing and a thrust bearing used for axial limiting of the rotating shaft are installed in the second bearing chamber, the rotating shaft is inserted into the second radial air foil bearing and the thrust bearing, and the thrust bearing and the end covers are respectively arranged on two sides of the second end.

8. A compressor according to claim 7, wherein: the second hole is still including conducting the second bearing room with the C hole of motor installation cavity and confession the D hole of the gaseous outflow in the second bearing room, C hole is located the second is served, D hole is located on the lateral wall of second bearing room.

9. A compressor according to claim 7, wherein: the end cover is provided with a first bearing chamber, a first radial air foil bearing is installed in the first bearing chamber, and the rotating shaft is inserted in the first radial air foil bearing.

10. A compressor according to claim 9, wherein: seal sleeves used for sealing are installed in the first bearing chamber and the second bearing chamber, and the rotating shaft penetrates through the seal sleeves.