WO2020134517A1

WO2020134517A1 - Compressor

Info

Publication number: WO2020134517A1
Application number: PCT/CN2019/113991
Authority: WO
Inventors: 刘华; 张治平; 李宏波; 钟瑞兴; 陈玉辉; 刘胜; 亓静利; 叶文腾
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-12-25
Filing date: 2019-10-29
Publication date: 2020-07-02
Also published as: CN111365254A

Abstract

A compressor, comprising: a housing (2); a motor stator (3) provided in the housing (2); a motor rotor (8) provided in the housing (2); a first gas bearing provided in the housing (2) and supporting the motor rotor (8); and an air supply flow channel provided in the housing (2), and used for being connected to an external air source and supplying working air provided by the external air source to the first air bearing; wherein the compressor is configured to allow the working gas that flows out of a gap between the first gas bearing and the motor rotor (8), and flows to a first side of the motor stator (3) by means of a gap between the motor stator (3) and the motor rotor (8) to be discharged from the housing (2); and the first side of the motor stator (3) is a side, away from the first gas bearing, of the motor stator (3) in an axial direction. The compressor can optimize an internal space of the compressor.

Description

compressor

Cross-reference of related applications

This disclosure is based on the application with the CN application number 201811593234.6 and the application date is December 25, 2018, and claims its priority. The disclosure content of this CN application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to a compressor.

Background technique

A centrifugal compressor is a compressor that uses high-speed impeller rotation to generate centrifugal force to compress gas. At present, centrifugal compressors mainly use two types of bearings, oil-lubricated bearings and electromagnetic bearings, to support the rotor. Among them, oil-lubricated bearings need to be equipped with an additional oil supply system, resulting in a complicated structure of the centrifugal compressor. And friction between the oil and the rotor will cause energy loss. In addition, lubricating oil may leak into the refrigerant, causing refrigerant pollution. Electromagnetic bearings have higher control requirements and poor resistance to system impact. In addition, additional power-off protection systems are required.

Hydrostatic gas bearings are bearings that use gas pressure to support the rotor and are oil-free bearings. The structure of this bearing is simple, the friction between the gas and the rotor is small, and no complicated control system is needed. The static pressure gas bearing adopts external gas supply, and its gas pressure is easy to adjust, and it can continue to supply gas during the start-stop phase of the compressor, avoiding the contact friction between the rotor and the bearing due to insufficient air supply during the start-stop phase To improve system stability.

Summary of the invention

It has been discovered by the inventors that the compressor of the related art has difficulty in passing external gas into the gas bearing accurately and with a small loss, and often requires an additional gas collection device to occupy the internal space of the compressor.

In view of this, the embodiments of the present disclosure provide a compressor capable of optimizing the internal space of the compressor.

In one aspect of the present disclosure, a compressor is provided, including: a housing; a motor stator, provided in the housing; a motor rotor, provided in the housing; a first gas bearing, provided in the housing, And support the rotor of the motor; and a gas supply channel provided in the housing for connecting an external gas source and supplying working gas provided by the external gas source to the first gas bearing; wherein, the The compressor is configured to allow the working gas to flow out from the gap between the first gas bearing and the motor rotor and flow to the first side of the motor stator via the gap between the motor stator and the motor rotor. The first side of the motor stator is the side away from the first gas bearing in the axial direction.

In some embodiments, a cooling gas flow path is provided between the housing and the motor stator, and the outlet of the cooling gas flow path is located on the second side of the motor stator to flow from the cooling gas The cooling gas flowing out of the outlet of the channel can be mixed with the working gas flowing out from the gap between the first gas bearing and the motor rotor on the second side of the motor stator, and then pass through the motor stator and the rotor of the motor. The gap flows to the first side of the motor stator;

Wherein, the second side of the motor stator is the side of the motor stator which is close to the first gas bearing in the axial direction.

In some embodiments, the first gas bearing includes: a first thrust gas bearing supporting the motor rotor in the axial direction and a first radial gas bearing supporting the motor rotor in the radial direction;

The air supply channel includes:

A first air supply channel is provided in the housing for connecting an external air source, and supplies working gas provided by the external air source to the first radial gas bearing;

A second air supply channel is provided in the housing for connecting an external air source, and supplies working gas provided by the external air source to the first thrust gas bearing.

In some embodiments, the first air supply channel and the second air supply channel are spaced apart from each other in the housing.

In some embodiments, the air inlet of the first air supply channel on the housing and the air inlet of the second air supply channel on the housing are located in opposite directions of the housing.

In some embodiments, the compressor further includes: a second gas bearing disposed in the housing and supporting the motor rotor;

The air supply channel further includes:

A third air supply channel is provided in the housing for connecting an external air source, and supplies working gas provided by the external air source to the second gas bearing.

In some embodiments, the third air supply channel and the first air supply channel communicate with each other and share the same air inlet on the housing.

In some embodiments, the compressor further includes:

The first-level impeller and the second-level impeller are fixedly connected to both ends of the motor rotor, respectively;

A second gas bearing, which is disposed adjacent to the secondary impeller and supports the motor rotor in the radial direction; and

A bearing seat is provided in the housing and supports the second gas bearing;

Wherein, the gas supply channel is also in communication with the second gas bearing for supplying the working gas provided by the external gas source to the second gas bearing, and the bearing seat is provided with a support for supporting the first A bearing mounting hole of a two-gas bearing, a vent hole group is provided between the bearing mounting hole and a surface of the bearing seat close to the stator side of the motor, for guiding from the second gas bearing and the motor The working gas flowing out of the gap of the rotor flows toward the bearing seat close to the stator of the motor.

In some embodiments, the compressor further includes: an axial sealing mechanism, disposed between the motor rotor and the bearing housing, for forming a seal on one side of the second gas bearing in the axial direction effect.

In some embodiments, the axial sealing mechanism includes: a comb-tooth seal, the comb-tooth seal is sleeved on the rotor of the motor, and is fixedly connected to the bearing seat, and the comb-tooth seal A flange near one side of the second gas bearing is provided with a group of ventilation slots, and the group of ventilation slots is at least partially in communication with the group of ventilation holes.

In some embodiments, the vent hole group includes at least one vent hole distributed along the circumferential direction of the bearing housing, and the vent slot group includes at least one vent hole distributed along the circumferential direction of the comb-tooth seal, The number of the vent holes is the same as the number of the vent grooves, and each vent groove is aligned with each vent hole.

In some embodiments, the compressor is a centrifugal compressor.

In some embodiments, the first gas bearing is a static pressure gas bearing.

In some embodiments, the second gas bearing is a static pressure gas bearing.

In some embodiments, the compressor further includes: an exhaust device, an intake port of which is located in the housing, for flowing out from the gap between the first gas bearing and the motor rotor, and passing the The working gas flowing from the gap between the motor stator and the motor rotor to the first side of the motor stator is discharged out of the housing.

Therefore, according to an embodiment of the present disclosure, by providing a gas supply channel that supplies the working gas outside the casing to the first gas bearing inside the casing, and will flow out from the gap between the first gas bearing and the motor rotor, and pass through the motor stator and the motor rotor The working gas flowing to the other side of the stator of the motor is discharged to the outside of the housing, so that the external working gas can be accurately supplied to the first gas bearing and is absorbed by the exhaust device after the rotor gap of the motor is fixed, so that no additional Gas collection device, thereby optimizing the internal space of the compressor.

BRIEF DESCRIPTION

The drawings that constitute a part of the description describe embodiments of the present disclosure, and together with the description are used to explain the principles of the present disclosure.

With reference to the drawings, the present disclosure can be more clearly understood from the following detailed description, in which:

1 is a schematic cross-sectional view of some embodiments of a compressor according to the present disclosure;

2 is a schematic structural view of a bearing housing in some embodiments of a compressor according to the present disclosure;

FIG. 3 is a schematic diagram of the A-A section in FIG. 2;

4 is a schematic structural view of a comb-tooth seal in some embodiments of a compressor according to the present disclosure;

FIG. 5 is a schematic diagram of the B-B cross section in FIG. 4.

It should be understood that the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals indicate the same or similar components.

detailed description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the drawings. The description of the exemplary embodiments is merely illustrative, and in no way serves as any limitation to the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These examples are provided to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that the relative arrangement of components and steps set forth in these embodiments should be interpreted as exemplary only, and not as limitations, unless specifically stated otherwise.

The terms “first”, “second” and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Similar words such as "include" or "include" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of covering other elements. "Up", "down", "left", "right", etc. are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In the present disclosure, when it is described that a specific device is located between the first device and the second device, there may or may not be an intervening device between the specific device and the first device or the second device. When it is described that a specific device is connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be directly connected to the other device without an intervening device.

All terms (including technical or scientific terms) used in the present disclosure have the same meaning as understood by those of ordinary skill in the art to which the present disclosure belongs, unless specifically defined otherwise. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies, and should not be interpreted using idealized or extremely formal meanings unless explicitly stated here Define it this way.

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the specification.

As shown in FIG. 1, it is a schematic cross-sectional view of some embodiments of a compressor according to the present disclosure. Referring to FIG. 1, in some embodiments, the compressor includes: a housing 2, a motor stator 3, a motor rotor 8 and a first gas bearing. In some embodiments, the compressor is a centrifugal compressor. In other embodiments, the compressor is another type of compressor, such as a screw compressor or a vane compressor. The motor stator 3 and the motor rotor 8 are both arranged in the housing 2. A gap is formed between the motor stator 3 and the motor rotor 8. In some embodiments, at least one stage of impeller is included within the housing 2. The at least one-stage impeller is fixedly connected to the motor rotor 8 and can rotate with the rotation of the motor rotor 8. The first gas bearing is provided in the housing 2 and supports the motor rotor 8. In some embodiments, the first gas bearing is a static pressure gas bearing.

In some embodiments, the compressor further includes a gas supply channel. The air supply channel is provided in the housing 2 for connecting an external air source, and supplies working gas provided by the external air source to the first gas bearing. The external air source can enter the first gas bearing accurately and with less loss through the air supply channel.

Referring to FIG. 1, in some embodiments, the first gas bearing includes: first

thrust gas bearings

12, 14 and first radial gas bearing 11. The first

thrust gas bearings

12 and 14 are respectively located on the right side and the left side of the thrust disk 18 fixedly connected to the motor rotor, which can achieve the support effect of the motor rotor 8 in the axial direction. The first radial gas bearing 11 is sleeved on the motor rotor 8 and supports the motor rotor 8 in the radial direction.

For the first gas bearing described above, in some embodiments, the air supply channel includes: a first air supply channel 10 and a second air supply channel 16. The first air supply channel 10 is provided in the housing 2 for connecting an external air source, and supplies working gas provided by the external air source to the first radial gas bearing 11. In FIG. 1, the first air supply channel 10 is opened inside the shell wall of the housing 2 and includes a plurality of sub-channels along the horizontal and vertical directions. These linear sub-channels can further reduce the pressure loss of the gas along the way. The end of the first air supply channel 10 is directly aligned with the outer ring of the first radial gas bearing 11, so that the working gas of the external gas source can be passed into the first radial gas bearing 11 accurately and with less loss. The working gas passed into the first radial gas bearing 11 can penetrate into the gap between the first radial gas bearing 11 and the motor rotor 8 through the porous material of the bearing to form a static pressure gas supporting effect.

The second air supply channel 16 is provided in the housing 2 for connecting an external air source, and supplies working gas provided by the external air source to the first

thrust gas bearings

12 and 14. In some embodiments, a part of the second air supply channel 16 is opened inside the wall of the housing 2 and its end is aligned with the right end surface of the first thrust gas bearing 12, while the other part is opened between the first thrust The gas bearing 14 is closely attached to the inside of the diffuser 13, and its end is aligned with the left end surface of the first thrust gas bearing 14, so that the working gas of the external air source can be accurately and less lost into the first

thrust gas Bearings

12, 14.

In some embodiments, the second gas supply channel 16 includes a plurality of sub-channels in the horizontal and vertical directions. These linear sub-channels can further reduce the pressure loss of the gas along the way. The working gas passed into the first

thrust gas bearings

12 and 14 can penetrate into the gap between the first

thrust gas bearings

12 and 14 and the thrust disc 18 through the porous material of the bearing, respectively, to form a static pressure gas support effect.

Considering that in some embodiments, the gas pressure required for the thrust gas bearing and the radial gas bearing is different, so in some embodiments, the first gas supply channel 10 and the second gas supply channel 16 are located in the The housing 2 is spaced apart from each other. In other words, the first air supply channel 10 and the second air supply channel 16 are independent of each other, and do not directly communicate in the internal channel of the housing. For example, the air inlet 9 of the first air supply channel 10 on the outside of the casing and the air inlet 1 of the second air supply channel 16 on the outside of the housing are respectively provided in different parts of the housing 2, and the first air supply channel 10 does not directly communicate with the second air supply channel 16. In this way, the air inlet 9 and the air inlet 1 are connected to external air sources of different pressures, so as to meet the working gas supply of the gas bearing that is more in line with the working conditions, and make the structure of the air supply channel simpler.

In order to facilitate the connection between the external air source and the air inlet and reduce the interference problem when connecting the external piping, in some embodiments, the first air supply channel 10 on the housing 2 is connected to the air inlet 9 The air inlet 1 of the second air supply channel 16 on the housing 2 is disposed in the opposite direction of the housing 2, for example, below and above the housing 2.

In some embodiments, the compressor is configured to allow outflow from the gap between the first gas bearing and the motor rotor 8 and flow to the via the gap between the motor stator 3 and the motor rotor 8 The working gas on the first side of the motor stator 3 is discharged to the outside of the housing 2. The first side of the motor stator 3 is the side of the motor stator 3 that is away from the first gas bearing in the axial direction. In this way, the working gas input from the outside of the compressor can be more easily discharged from the inside of the compressor to ensure the stability of the gas supply, without the need to provide a special device for collecting working gas, thereby optimizing the internal space of the compressor. In addition, the cooling effect of the motor stator and the motor rotor can also be achieved by the flow of working gas in the fixed rotor gap.

Referring to FIG. 1, in some embodiments, the compressor further includes an exhaust device 21 (indicated by arrows). Referring to the sign of the air flow direction indicated by arrows in FIG. 1, the suction port of the exhaust device 21 is located in the housing 2, which can flow out from the gap between the first gas bearing and the motor rotor 8 and pass through The gap between the motor stator 3 and the motor rotor 8 flows to the first side of the motor stator 3 (that is, the side of the motor stator 3 that is away from the first gas bearing in the axial direction, corresponding to FIG. 1 The working gas in the area B) is discharged outside the housing 2.

In FIG. 1, a cooling gas flow channel 15 is provided between the housing 2 and the motor stator 3. The outlet of the cooling gas flow channel 15 is located on the second side of the motor stator 3 (i.e., the side of the motor stator 3 near the first gas bearing in the axial direction). In this way, the cooling gas that enters the cooling gas flow channel 15 can flow out from the outlet of the cooling gas flow channel 15, and the working gas that flows out from the gap between the first gas bearing and the motor rotor 8 can The two sides (corresponding to area A in FIG. 1) are mixed, and the mixed gas medium flows to the first side of the motor stator 3 through the gap between the motor stator 3 and the motor rotor 8 (corresponding to FIG. 1) Area B).

After the cooling gas and the working gas are mixed, the cooling effect of the motor stator 3 and the motor rotor 8 can be achieved when passing between the motor stator 3 and the motor rotor 8, and can also be absorbed by the exhaust device 21 and discharged to the outside of the housing, so that The gas circulation inside and outside the compressor is smoother, ensuring the stability of the internal working of the compressor. In some embodiments, the cooling gas and the working gas are the same medium, and in other embodiments, the cooling gas and the working gas are different media. In some embodiments, both the cooling gas and the working gas are refrigerant compressed by the compressor.

Referring to FIG. 1, in some embodiments, the compressor includes a two-stage impeller. The two-stage impeller is fixedly connected to both ends of the rotor 8 of the motor. The first

thrust gas bearings

12, 14 and the first radial direction in the first gas bearing The gas bearings 11 are arranged on the side of the motor rotor 8 close to the second-stage impeller 20 relative to the first-stage impeller 19. The compressor further includes a second gas bearing 6, which supports the motor rotor 8 at a position of the two-stage impeller 20 close to the first impeller 19 side. In some embodiments, the second gas bearing is a static pressure gas bearing.

In order to install the second gas bearing 6, in some embodiments, the second gas bearing 6 is supported by the bearing seat 5 provided in the housing 2. The air supply channel further includes: a third air supply channel 17 disposed in the housing 2. The third air supply channel 17 is used to connect an external air source and supply working gas provided by the external air source to the second gas bearing 6.

Considering that the operating conditions of the first radial gas bearing and the second gas bearing 6 which are also radial gas bearings are relatively close, in some embodiments, the third gas supply channel 17 and the second gas supply channel 16 are mutually connected They are connected and share the same air inlet on the housing 2 to simplify the air supply channel.

Referring to FIGS. 1-3, in some embodiments, the gas supply passage 10 communicates with the second gas bearing 6 (directly communicated, or communicated via a flow passage 53 opened on the bearing seat 5), which is used to connect the external The working gas provided by the gas source is supplied to the second gas bearing 6. The bearing housing 5 has a bearing mounting hole 52 provided for supporting the second gas bearing 6, and a vent hole is provided between the bearing mounting hole 52 and a surface of the bearing housing 5 close to the motor stator 3 side group.

In some embodiments, the vent hole group includes at least one vent hole 51 distributed along the circumferential direction of the bearing seat 5. The vent hole group can guide the working gas flowing out from the gap between the second gas bearing 6 and the motor rotor 8 to flow to the area B of the bearing housing 5 close to the motor stator 3 side. The working gas entering the area B can be absorbed by the exhaust device 21 and discharged out of the casing.

Referring to FIG. 1, in some embodiments, the compressor further includes: an axial sealing mechanism, which is disposed between the motor rotor 8 and the bearing seat 5, and is used for the second gas bearing 6 in the axial direction The side of the seal is formed. 4-5, in some embodiments, the axial sealing mechanism includes: a comb-tooth seal 7. The comb-tooth seal 7 is sleeved on the motor rotor 8 and fixedly connected to the bearing housing 5. A flange 74 on the side of the comb-tooth seal 7 near the second gas bearing 6 is provided A vent slot group, the vent slot group is at least partially in communication with the vent hole group. The comb seal 7 is also provided with comb teeth 71 arranged in the axial direction and an assembly hole 72 for assembling with the bearing housing 5.

In some embodiments, the vent groove group includes at least one vent groove group distributed along the circumferential direction of the comb-tooth seal 7, in order to smoothly discharge the working gas flowing out from the gap between the second gas bearing 6 and the motor rotor 8, In some embodiments, the number of vent holes 51 is the same as the number of vent grooves 71, for example, 5 (or 3 or 7 all), and each vent groove 71 is aligned with each vent hole 51, respectively.

So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

A compressor, including:

Housing (2);

The motor stator (3) is arranged in the housing (2);

The motor rotor (8) is arranged in the housing (2);

A first gas bearing is provided in the housing (2) and supports the motor rotor (8); and

A gas supply channel is provided in the housing (2) for connecting an external gas source and supplying working gas provided by the external gas source to the first gas bearing;

Wherein, the compressor is configured to allow outflow from the gap between the first gas bearing and the motor rotor (8) and flow to the gap through the gap between the motor stator (3) and the motor rotor (8) The working gas on the first side of the motor stator (3) is discharged out of the housing (2), and the first side of the motor stator (3) is that the motor stator (3) is away from Describe one side of the first gas bearing.
The compressor according to claim 1, wherein a cooling gas flow passage (15) is provided between the casing (2) and the motor stator (3), and an outlet of the cooling gas flow passage (15) Located on the second side of the motor stator (3) so that the cooling gas flowing out of the outlet of the cooling gas flow channel (15) can flow out from the gap between the first gas bearing and the motor rotor (8) Of the working gas is mixed on the second side of the motor stator (3), and then flows to the first side of the motor stator (3) via the gap between the motor stator (3) and the motor rotor (8);

Wherein, the second side of the motor stator (3) is the side of the motor stator (3) close to the first gas bearing in the axial direction.
The compressor according to claim 1, wherein the first gas bearing includes: a first thrust gas bearing (12, 14) supporting the motor rotor (8) in the axial direction and supporting the motor in the radial direction The first radial gas bearing (11) of the rotor (8);

The air supply channel includes:

A first air supply channel (10) is provided in the housing (2) for connecting an external air source and supplying working gas provided by the external air source to the first radial gas bearing (11) );

A second air supply channel (16) is provided in the housing (2) for connecting an external air source, and supplies working gas provided by the external air source to the first thrust gas bearing (12, 14).
The compressor according to claim 3, wherein the first air flow path (10) and the second air flow path (16) are spaced apart from each other in the housing (2).
The compressor according to claim 4, wherein the air inlet of the first air supply passage (10) on the casing (2) and the second air supply passage (16) are on the casing The air inlet on (2) is located in the opposite direction of the housing (2).
The compressor according to claim 3, further comprising: a second gas bearing (6) provided in the housing and supporting the motor rotor (8);

The air supply channel further includes:

A third air supply channel (17) is provided in the housing (2) for connecting an external air source and supplying working gas provided by the external air source to the second gas bearing (6).
The compressor according to claim 6, wherein the third air supply channel (17) and the first air supply channel (10) communicate with each other and share the same air inlet on the casing (2).
The compressor according to claim 1, further comprising:

The first-level impeller (19) and the second-level impeller (20) are respectively fixedly connected to both ends of the rotor of the motor;

A second gas bearing (6), which is arranged close to the secondary impeller (20) and supports the motor rotor (8) in the radial direction; and

A bearing seat (5) is provided in the housing (2), and supports the second gas bearing (6);

Wherein, the gas supply channel is also in communication with the second gas bearing (6) for supplying the working gas provided by the external gas source to the second gas bearing (6), the bearing seat (5 ) Has a bearing mounting hole (52) for supporting the second gas bearing (6), and the bearing mounting hole (52) and the bearing seat (5) are close to the motor stator (3) side Between the surfaces are provided with vent holes for guiding the working gas flowing out from the gap between the second gas bearing (6) and the motor rotor (8) to the bearing seat (5) close to the motor stator (3) One side.
The compressor according to claim 8, further comprising: an axial sealing mechanism provided between the motor rotor (8) and the bearing housing (5) for the second gas bearing (6) One side of the axial direction forms a sealing effect.
The compressor according to claim 9, wherein the axial sealing mechanism includes: a comb-tooth seal (7), the comb-tooth seal (7) is sleeved on the motor rotor (8), and The bearing seat (5) is fixedly connected, and a vent groove group is provided on a flange (74) of the comb tooth seal (7) close to the second gas bearing (6) side, the vent groove group At least partially communicate with the vent group.
The compressor according to claim 10, wherein the vent hole group includes at least one vent hole (51) distributed along the circumferential direction of the bearing housing (5), and the vent groove group includes a seal along the comb teeth At least one vent groove distributed in the circumferential direction of the piece (7), the number of the vent holes (51) is the same as the number of the vent grooves (71), and each vent groove (71) is separately from each vent hole (51) Align.
The compressor according to claim 1, wherein the compressor is a centrifugal compressor.
The compressor of claim 1, wherein the first gas bearing is a static pressure gas bearing.
The compressor according to claim 8, wherein the second gas bearing is a static pressure gas bearing.
The compressor according to claim 1, further comprising:

The exhaust device (21), whose suction port is located in the housing (2), is used to flow out from the gap between the first gas bearing and the motor rotor (8) and pass through the motor stator ( 3) The working gas flowing to the first side of the motor stator (3) in the gap with the motor rotor (8) is discharged out of the housing (2).