Gas-bearing centrifugal refrigerant compressor

Abstract

A gas-bearing centrifugal refrigerant compressor. A motor housing (1) and a gas outlet mechanism jointly form a main structure of the compressor. In the compressor, a motor stator (2) is powered on by means of an electric control system so as to drive a rotor (3) to rotate; the rotor (3) drives a first impeller (14) and a second impeller (15) to rotate; the first impeller (14) and the second impeller (15) do work on refrigerant gas entering a ventilation cavity; some gas leaks through mounting gaps of the first impeller (14) and the second impeller (15), passes through a sealing mechanism, and then enters between a gas bearing pack and the rotor (3); a gas film layer is formed when the rotor (3) rotates, achieving a gas bearing function; and the refrigerant gas entering a mounting cavity can cool the gas bearing pack. The compressor does not require an additional bearing gas supply system, simplifying the gas bearing design.

Description

Air-floating centrifugal refrigerant compressor Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an air-floating centrifugal refrigerant compressor. Background Art

[0002] At present, the total scale of my country's central air-conditioning market has reached hundreds of billions of yuan. Driven by projects such as medical transformation, new infrastructure, and rail transit, the market space for small-capacity centrifugal refrigeration units has shown an upward trend. At present, small-capacity centrifugal compressors are mainly represented by magnetic levitation compressors. However, magnetic levitation bearings are large in size and have complex control systems. It is very difficult to further miniaturize centrifugal refrigerant compressors. In comparison, air levitation bearings not only have low friction loss and strong high temperature resistance, but also have a simple structure and high rotation accuracy. They are the most ideal supporting components besides magnetic levitation bearings for high-speed operation.

[0003] As one of the future development directions of centrifugal compressors, the air-suspended centrifugal compressor overcomes the shortcomings of the traditional gear speed increase method and does not require the shaft displacement detection and bearing control system required by magnetic suspension bearings. It has the advantages of high cost performance and no need for active control.

[0004] Existing air-floating centrifugal refrigerant compressors, whether static pressure air flotation or dynamic pressure air flotation, require an additional bearing air supply system or a special bearing air supply channel structure to supply air to the air-floating bearings. This not only increases costs, but also requires regular maintenance of gas filters, etc., increasing maintenance costs.

[0005] Summary of the Invention

[0006] In view of this, the present application provides an air-floating centrifugal refrigerant compressor that does not require an additional bearing air supply system.

[0007] In the first aspect, the present application provides an air-floating centrifugal refrigerant compressor, comprising: a motor housing, comprising a mounting cavity; a motor stator, arranged in the mounting cavity; a rotor, arranged in the mounting cavity, the rotor and the motor stator being mounted in matching relation, a first impeller and a second impeller being respectively provided at both ends of the rotor, the first impeller and the second impeller at least partially extending out of the motor housing; an air-floating bearing group, arranged in the mounting cavity, a gap being provided between the air-floating bearing group and the rotor, the air-floating bearing group structure supporting the rotation of the rotor through an air film formed by refrigerant gas; a sealing mechanism, configured to seal the mounting cavity with a set sealing strength; and an air outlet mechanism, having a ventilation cavity, the first impeller and the second impeller being both located in the ventilation cavity, the air outlet mechanism being configured to form an air pressure in the ventilation cavity that is higher than the air pressure in the mounting cavity.

[0008] When this aspect is in use, the motor housing and the air outlet mechanism together constitute the main structure of the compressor. The compressor is in a refrigerant gas environment, and the motor stator is energized through the electronic control system, thereby driving the rotor to rotate. The rotor drives the first impeller and the second impeller to rotate, and the first impeller and the second impeller perform work on the refrigerant gas in the ventilation cavity. The refrigerant gas in the ventilation cavity flows, and the air outlet mechanism creates a pressure difference between the installation cavity and the ventilation cavity, and the sealing mechanism seals the installation cavity. Due to the existence of the pressure difference, some gas leaks into the installation cavity through the installation gap between the first impeller and the second impeller, and enters the air bearing group and the rotor to form a refrigerant gas layer, realizing the air bearing function. At the same time, the refrigerant gas entering the installation cavity can also cool the air bearing group. Furthermore, this embodiment does not require an additional bearing air supply system, which simplifies the air bearing design.

[0009] In combination with the first aspect, in a possible implementation, the rotor includes: a mate, the motor stator is configured to drive the mate to rotate; a first main shaft, connected between the mate and the first impeller; and a second main shaft, connected between the mate and the second impeller; wherein the air bearing group includes: a first air bearing, arranged on the circumference of the first main shaft; and a second air bearing, arranged on the circumference of the second main shaft.

[0010] In combination with the first aspect, in a possible implementation, the rotor further includes: a first transition section, arranged between the first main shaft and the first impeller, the radial dimension of the first transition section being smaller than the radial dimension of the first main shaft; and a second transition section, arranged between the second main shaft and the second impeller, the radial dimension of the second transition section being smaller than the radial dimension of the second main shaft; the sealing mechanism includes: a first sealing plate, connected to the motor housing, the first sealing plate being sleeved between the first main shaft and the first impeller; and a second sealing plate, connected to the motor housing, the second sealing plate being sleeved between the second main shaft and the second impeller.

[0011] In combination with the first aspect, in a possible implementation, the sealing mechanism further includes: a thrust plate, which is sleeved on the circumferential surface of the second transition section; and a thrust adjustment assembly, which is respectively connected to the thrust plate and the motor housing, and the thrust adjustment assembly is constructed to control the distance between the disk surface of the thrust plate and the motor housing.

[0012] In combination with the first aspect, in a possible implementation, it also includes: a sleeve, which is sleeved on the circumferential surface of the second transition section, one end of the sleeve abuts against the second impeller, the other end of the sleeve abuts against the first disk surface of the thrust plate, and the second disk surface of the thrust plate abuts against the end surface of the second main shaft; the first disk surface and the second disk surface are respectively located on opposite sides of the thrust plate.

[0013] In combination with the first aspect, in a possible implementation, it further includes: a thrust bearing, which is arranged on the motor housing, the support surface of the thrust bearing faces the disk surface of the thrust plate, and the thrust bearing is constructed to support the thrust plate to rotate relative to the motor housing.

[0014] In combination with the first aspect, in a possible implementation, the air outlet mechanism includes: an air inlet seat, the air inlet seat includes an air supply port, the first impeller includes a first impeller air inlet and a first impeller air outlet, and the air supply port is connected to the first impeller air inlet; and a first volute, connected to the motor housing, the first volute includes a first volute air inlet and a first volute air outlet, and the first volute air inlet is connected to the first impeller air outlet; wherein, the gap between the first impeller and the motor housing is connected to the first volute air inlet.

[0015] In combination with the first aspect, in a possible implementation, the air outlet mechanism also includes: an intermediate duct, including a first end of the intermediate duct and a second end of the intermediate duct, the first end of the intermediate duct being connected to the first volute air outlet; and a second volute, connected to the motor housing, the second volute including a second volute air inlet and a second volute air outlet, the second volute air inlet being connected to the second end of the intermediate duct, and the second volute air outlet being used for exhaust; wherein the gap between the second impeller and the motor housing is connected to the first volute air inlet.

[0016] In combination with the first aspect, in a possible implementation, the motor housing also includes: a first cavity, in which the gap between the first air bearing and the first main shaft is connected to the first cavity; and a second cavity, in which the gap between the second air bearing and the second main shaft is connected to the second cavity; there is a cooling channel between the motor stator and the mating body, and the cooling channel is configured to connect the first cavity and the second cavity.

[0017] In combination with the first aspect, in a possible implementation, the motor housing further includes: a cooling air outlet, one end of the cooling air outlet is connected to the outside of the motor housing, and the other end of the cooling air outlet is connected to the second cavity; a motor cooling channel, which is opened on the inner wall of the motor housing, the motor cooling channel is arranged around the motor stator, and the motor cooling channel is connected to the first cavity; and a cooling air inlet, one end of the cooling air inlet is connected to the outside of the motor housing, and the other end of the cooling air inlet is connected to the motor cooling channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of an air-floating centrifugal refrigerant compressor provided in one embodiment of the present application.

[0019] FIG2 is a schematic diagram showing a partial structure of an air-floating centrifugal refrigerant compressor provided in another embodiment of the present application.

[0020] FIG3 is a schematic structural diagram of an air-floating centrifugal refrigerant compressor provided in another embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0022] An exemplary air-floating centrifugal refrigerant compressor is as follows:

[0023] Figure 1 is a schematic structural diagram of an air-floating centrifugal refrigerant compressor provided in one embodiment of the present application. The present application provides an air-floating centrifugal refrigerant compressor. In one embodiment, as shown in Figure 1 , the air-floating centrifugal refrigerant compressor comprises: a motor housing 1, a motor stator 2, a rotor 3, an air-floating bearing assembly, a sealing mechanism, and an air outlet mechanism.

[0024] The motor housing 1 includes a mounting cavity, in which the motor stator 2 is disposed. The rotor 3 is disposed within the mounting cavity, and the rotor 3 and the motor stator 2 are mounted in a mating manner. A first impeller 14 and a second impeller 15 are provided at each end of the rotor 3, respectively, and the first impeller 14 and the second impeller 15 at least partially extend outside the motor housing 1. An air bearing assembly is disposed within the mounting cavity, with a gap between the air bearing assembly and the rotor. The air bearing assembly is configured to support the rotation of the rotor via an air film layer formed by refrigerant gas. The sealing mechanism is configured to seal the mounting cavity with a set sealing strength. The air outlet mechanism includes a ventilation cavity, in which the first impeller 14 and the second impeller 15 are both located. The air outlet mechanism is configured to generate an air pressure within the ventilation cavity that is higher than the air pressure within the mounting cavity.

[0025] When this embodiment is used, the motor housing 1 and the air outlet mechanism together constitute the main structure of the compressor. The compressor is in a refrigerant gas environment. Power is supplied to the motor stator 2 via the electronic control system 100, thereby driving the rotor 3 to rotate. The rotor 3 drives the first and second impellers 14, 15 to rotate. The first and second impellers 14, 15 perform work on the refrigerant gas entering the ventilation cavity. The refrigerant gas in the ventilation cavity flows, and the air outlet mechanism and sealing mechanism create a pressure differential between the mounting cavity and the ventilation cavity. Due to the pressure differential between the first and second impellers 14, 15 and the mounting cavity, some gas leaks through the mounting gap between the first and second impellers 14, 15, passes through the sealing mechanism, enters the mounting cavity, and enters the gap between the air bearing assembly and the rotor. As the rotor rotates, a refrigerant gas layer is formed, realizing the air bearing function. Simultaneously, the refrigerant gas entering the mounting cavity can also cool the air bearing assembly. Furthermore, this embodiment does not require an additional bearing air supply system, simplifying the air bearing design.

[0026] Figure 2 shows a partial structural schematic diagram of an air-floating centrifugal refrigerant compressor provided in another embodiment of the present application. In one embodiment, as shown in Figure 2, the rotor 3 comprises a mate 301, a first main shaft 302, and a second main shaft 303. The motor stator 2 is configured to drive the mate 301 in rotation. For example, the mate 301 is made of a permanent magnet, and a coil is wound around the motor stator 2. When the electronic control system 100 energizes the coil, an electromagnetic field is generated, thereby driving the mate 301 in rotation. The first main shaft 302 is connected between the mate 301 and the first impeller 14, and the second main shaft 303 is connected between the mate 301 and the second impeller 15. Referring to Figure 1, the air bearing assembly comprises a first air bearing 5 and a second air bearing 4. The first air bearing 5 is disposed circumferentially around the first main shaft 302. The second air bearing 4 is disposed circumferentially around the second main shaft 303.

[0027] In this embodiment, the first impeller 14 is driven to rotate by the first main shaft 302, and the second impeller 15 is driven to rotate by the second main shaft 303. The first air bearing 5 supports the first main shaft 302, and the second air bearing 4 supports the second main shaft 303.

[0028] In one embodiment, as shown in FIG1 , the air outlet mechanism includes: an air inlet seat 31 and a first volute 10. The air inlet seat 31 can be connected and fixed on the first volute or the motor housing 1. The air inlet seat 31 includes an air supply port, and the air inlet seat 31 is also provided with a structure for air intake. The first impeller 14 includes a first impeller air inlet and a first impeller air outlet, and the air supply port is connected to the first impeller air inlet. The first volute 10 is connected to the motor housing 1, and the first volute 10 includes a first volute air inlet and a first volute air outlet, and the first volute air inlet is connected to the first impeller air outlet. Among them, the gap between the first impeller 14 and the motor housing 1 is connected to the first volute air inlet.

[0029] In this embodiment, the cold air output by the refrigerator can be introduced into the air inlet seat 31. Driven by the first impeller 14, the cold air enters the first volute 10. The first volute 10 is structurally designed to form a high pressure in the first volute 10, that is, the air pressure in the first volute 10 is greater than the air pressure in the motor housing 1. Specifically, the internal air pressure can be increased by controlling the air output of the first volute 10. Due to the pressure difference, the cold air in the first volute 10 enters the motor housing 1 through the gap between the first impeller 14 and the motor housing 1, and then enters the gap between the first air bearing 5 and the first main shaft 302 to form a refrigerant gas layer, thereby achieving air bearing support. At the same time, the cold air can also cool the first air bearing 5.

[0030] In one embodiment, as shown in Figure 1, the air outlet mechanism further includes an intermediate duct 11 and a second volute 9. The intermediate duct 11 includes a first end and a second end, the first end of which is connected to the first volute air outlet. The second volute 9 is connected to the motor housing 1 and includes a second volute air inlet and a second volute air outlet. The second volute air inlet is connected to the second end of the intermediate duct, and the second volute air outlet is used for exhaust. The gap between the second impeller 15 and the motor housing 1 is connected to the first volute air inlet.

[0031] In this embodiment, the cold air output from the first volute 10 also enters the second volute 9 through the intermediate pipe 11. The structural design of the second volute 9 creates a high pressure in the second volute 9, that is, the air pressure in the second volute 9 is greater than the air pressure in the motor housing 1. Specifically, the internal air pressure can be increased by controlling the air output of the second volute 9. Due to the pressure difference, the cold air in the second volute 9 enters the motor housing 1 through the gap between the second impeller 15 and the motor housing 1. The cold air then enters the gap between the second air bearing 4 and the second main shaft 303 to form a refrigerant gas layer, thereby achieving air bearing support. At the same time, the cold air can also cool the second air bearing 4.

[0032] In one embodiment, as shown in Figure 1 , the motor housing 1 further comprises a first cavity 13 and a second cavity 12. The gap between the first air bearing 5 and the first spindle 302 communicates with the first cavity 13. The gap between the second air bearing 4 and the second spindle 303 communicates with the second cavity 12. A cooling channel 25 is defined between the motor stator 2 and the mating body 301, connecting the first cavity 13 and the second cavity 12.

[0033] In this embodiment, cold air passing through the first air bearing 5 and the first spindle 302 enters the first cavity 13, and cold air passing through the second air bearing 4 and the second spindle 303 enters the second cavity 12. The cold air can also cool the mating body 301 of the motor stator 2 and rotor 3 through the cooling channel 25.

[0034] In one embodiment, as shown in Figure 1, the motor housing 1 further includes a cooling air outlet 27, a motor cooling channel 22, and a cooling air inlet 26. One end of the cooling air outlet 27 is connected to the exterior of the motor housing 1, while the other end is connected to the second cavity 12. The motor cooling channel 22 is formed on the inner wall of the motor housing 1, surrounding the motor stator 2 and connecting to the first cavity 13. One end of the cooling air inlet 26 is connected to the exterior of the motor housing 1, while the other end is connected to the motor cooling channel 22.

[0035] FIG3 is a schematic diagram of the structure of an air-floating centrifugal refrigerant compressor provided in another embodiment of the present application. When this embodiment is in use, referring to FIG3 , the cooling air inlet 26 and the cooling air outlet 27 are both connected to the outside world. Gas is input at a small flow rate from the cooling air inlet 26. The gas passes through the motor cooling channel 22 to cool the motor stator 2 before entering the first cavity 13. The cold air entering the first cavity 13 through the first air bearing 5 increases the pressure within the first cavity 13. The cold air mixes with the gas input from the cooling air inlet 26 and passes through the cooling channel 25 to cool the motor stator 2 and the fitting 301. The mixed gas enters the second cavity 12 through the cooling channel 25 and mixes with the cold air passing through the second air bearing 4. After mixing, the mixed gas is output from the cooling air outlet 27.

[0036] In one embodiment, as shown in FIG1 , the rotor 3 further includes a first transition section 304 and a second transition section 305 . The first transition section 304 is disposed between the first main shaft 302 and the first impeller 14 , and the radial dimension of the first transition section 304 is smaller than the radial dimension of the first main shaft 302 . The second transition section 305 is disposed between the second main shaft 303 and the second impeller 15 , and the radial dimension of the second transition section 305 is smaller than the radial dimension of the second main shaft 303 . Referring to FIG1 , the sealing mechanism includes a first sealing plate 8 and a second sealing plate 7 . The first sealing plate 8 is connected to the motor housing 1 and is mounted between the first main shaft 302 and the first impeller 14 . The second sealing plate 7 is connected to the motor housing 1 and is mounted between the second main shaft 303 and the second impeller 15 .

[0037] In this embodiment, the first sealing plate 8 seals the motor housing 1 from the first impeller 14 side, while the second sealing plate 7 seals the motor housing 1 from the second impeller 15 side. Cold air outside the motor housing 1 can sequentially enter the motor housing 1 through the first impeller 14 and the first sealing plate 8, and then sequentially enter the motor housing 1 through the second impeller 15 and the second sealing plate 7. Adjusting the sealing strength of the first sealing plate 8 can control the amount of air entering the motor housing 1 from the first impeller 14 side, while adjusting the sealing strength of the second sealing plate 7 can control the amount of air entering the motor housing 1 from the second impeller 15 side.

[0038] In one embodiment, as shown in Figures 1 and 2 , the sealing mechanism further includes a thrust plate 17 and a thrust adjustment assembly (not shown). The thrust plate 17 is sleeved onto the circumferential surface of the second transition section 305 . The thrust adjustment assembly is connected to the thrust plate 17 and the motor housing 1 , respectively. The thrust adjustment assembly is configured to control the distance between the surface of the thrust plate 17 and the motor housing 1 . Specifically, the thrust adjustment assembly can employ a distance adjustment member, such as a bolt, which can be tightened to adjust the position of the thrust plate 17 relative to the motor housing 1 .

[0039] In this embodiment, the distance between the thrust plate 17 and the motor housing 1 can be adjusted by operating the thrust adjustment assembly. Since the rotor 3, the first sealing plate 8, the second sealing plate 7, and the thrust plate 17 are interconnected, the first sealing plate 8 and the second sealing plate 7 move simultaneously when the thrust plate 17 moves. Therefore, the sealing strength between the first sealing plate 8 and the second sealing plate 7 can be adjusted by the thrust adjustment assembly.

[0040] In one embodiment, as shown in Figure 2 , the air-floating centrifugal refrigerant compressor further includes a bushing 18, which is sleeved onto the circumferential surface of the second transition section 305. One end of the bushing 18 abuts the second impeller 15, and the other end of the bushing 18 abuts the first surface of the thrust plate 17. The second surface of the thrust plate 17 abuts the end surface of the second main shaft 303. The first and second surfaces are located on opposite sides of the thrust plate 17. In this embodiment, the bushing 18 acts as a fixed stop for the thrust plate 17, ensuring that the thrust plate 17 can drive the first and second sealing plates 8 and 7 to move.

[0041] In one embodiment, as shown in FIG2 , one end of the first impeller 14 is positioned by the axial end of the first main shaft 302, and then the first impeller 14 is locked and fixed using the first lock nut 19. One end of the second impeller 15 is positioned by the axial end of the second main shaft 303 and abuts against the end surface of the bushing 18, and then the second impeller 15 is locked and fixed using the second lock nut 20.

[0042] In one embodiment, as shown in FIG1 , the air-floating centrifugal refrigerant compressor further includes a thrust bearing 30 . The thrust bearing 30 is disposed on the motor housing 1 , with the support surface of the thrust bearing 30 facing the surface of the thrust plate 17 . The thrust bearing 30 is configured to support the thrust plate 17 for rotation relative to the motor housing 1 . In this embodiment, since the rotation of the rotor 3 drives the thrust plate 17 to rotate together, the thrust bearing 30 can effectively provide bearing support for the thrust plate 17 .

[0043] In conjunction with Figures 1 and 3 , the solid arrowed line in Figure 3 indicates the approximate direction of airflow. Gas is introduced at a low flow rate from the cooling air inlet 26, passes through the motor cooling channel 22 to cool the motor stator 2, and then enters the first cavity 13. Cooling air within the first volute 10 sequentially passes through the first impeller 14 and the first sealing plate 8 to reach the location of the first air bearing 5. After passing through the first air bearing 5, the cool air enters the first cavity 13. The cool air mixes with the gas introduced from the cooling air inlet 26 and then passes through the cooling channel 25 to cool the motor stator 2 and the fitting 301. Cooling air within the second volute 9 sequentially passes through the second impeller 15, the second sealing plate 7, and the thrust plate 17 to reach the location of the second air bearing 4. After passing through the second air bearing 4, the cool air enters the second cavity 12. The mixed gas within the second cavity 12 is then discharged through the cooling outlet 27. The flow rates of the cooling air inlet 26 and the cooling outlet 27 can be adjusted to control the pressure differential between the first cavity 13, the second cavity 12, and the outside world.

[0044] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0045] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0046] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0047] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be applied in the widest sense consistent with the principles and novel features of the present invention.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An air-floating centrifugal refrigerant compressor, characterized in that: include: A motor housing (1) comprising a mounting cavity; A motor stator (2) is arranged in the installation cavity; A rotor (3) is arranged in the installation cavity, the rotor (3) and the motor stator (2) are installed in a matching manner, a first impeller (14) and a second impeller (15) are respectively arranged at two ends of the rotor (3), and the first impeller (14) and the second impeller (15) at least partially extend outside the motor housing (1); An air bearing group is arranged in the installation cavity, a gap is provided between the air bearing group and the rotor (3), and the air bearing group structure supports the rotation of the rotor through an air film formed by refrigerant gas; a sealing mechanism configured to seal the mounting cavity with a set sealing strength; as well as The air outlet mechanism has a ventilation cavity, the first impeller (14) and the second impeller (15) are both located in the ventilation cavity, and the air outlet mechanism is configured to form an air pressure in the ventilation cavity that is higher than the air pressure in the installation cavity.

2. The air-floating centrifugal refrigerant compressor according to claim 1, characterized in that: The rotor (3) comprises: A matching body (301), wherein the motor stator (2) is configured to drive the matching body (301) to rotate; A first main shaft (302) connected between the fitting (301) and the first impeller (14); and A second main shaft (303) connected between the fitting (301) and the second impeller (15); Wherein, the air bearing group comprises: A first air bearing (5) is arranged in the circumferential direction of the first main shaft (302); and The second air bearing (4) is arranged in the circumferential direction of the second main shaft (303).

3. The air-floating centrifugal refrigerant compressor according to claim 2, characterized in that: The rotor (3) further comprises: A first transition section (304) is disposed between the first main shaft (302) and the first impeller (14), wherein the radial dimension of the first transition section (304) is smaller than that of the first main shaft (302). The radial dimension of a second transition section (305) disposed between the second main shaft (303) and the second impeller (15), wherein a radial dimension of the second transition section (305) is smaller than a radial dimension of the second main shaft (303); The sealing mechanism comprises: A first sealing plate (8) connected to the motor housing (1), wherein the first sealing plate (8) is sleeved between the first main shaft (302) and the first impeller (14); and A second sealing plate (7) is connected to the motor housing (1), and the second sealing plate (7) is sleeved between the second main shaft (303) and the second impeller (15).

4. The air-floating centrifugal refrigerant compressor according to claim 3, characterized in that: The sealing mechanism also includes: A thrust plate (17) sleeved on the circumference of the second transition section (305); and A thrust adjustment component is connected to the thrust disk (17) and the motor housing (1) respectively, and the thrust adjustment component is configured to control the distance between the disk surface of the thrust disk (17) and the motor housing (1).

5. The air-floating centrifugal refrigerant compressor according to claim 4, characterized in that: Also includes: A bushing (18) is sleeved on the circumferential surface of the second transition section (305); one end of the bushing (18) abuts against the second impeller (15); the other end of the bushing (18) abuts against the first disk surface of the thrust disk (17); the second disk surface of the thrust disk (17) abuts against the end surface of the second main shaft (303); the first disk surface and the second disk surface are respectively located on opposite sides of the thrust disk (17).

6. The air-floating centrifugal refrigerant compressor according to claim 4 or 5, characterized in that: Also includes: A thrust bearing (30) is arranged on the motor housing (1), the support surface of the thrust bearing (30) faces the disk surface of the thrust disk (17), and the thrust bearing (30) is configured to support the thrust disk (17) to rotate relative to the motor housing (1).

7. The air-floating centrifugal refrigerant compressor according to any one of claims 2 to 6, characterized in that: The air outlet mechanism comprises: An air inlet seat (31), the air inlet seat (31) comprising an air delivery port, the first impeller (14) comprising a first impeller air inlet and a first impeller air outlet, the air delivery port being connected to the first impeller air inlet; and A first volute (10) connected to the motor housing (1), the first volute (10) comprising a first volute air inlet and a first volute air outlet, the first volute air inlet being connected to the first impeller air outlet; The gap between the first impeller (14) and the motor housing (1) is connected to the first volute air inlet, and the air inlet seat (31) is connected to the first volute (10) or the motor housing (1).

8. The air-floating centrifugal refrigerant compressor according to claim 7, characterized in that: The air outlet mechanism also includes: An intermediate pipe (11), comprising an intermediate pipe first end and an intermediate pipe second end, wherein the intermediate pipe first end is connected to the first volute air outlet; and a second volute (9) connected to the motor housing (1), the second volute (9) comprising a second volute air inlet and a second volute air outlet, the second volute air inlet being connected to the second end of the intermediate pipe, and the second volute air outlet being used for exhausting air; Wherein, the gap between the second impeller (15) and the motor housing (1) is connected to the first volute air inlet.

9. The air-floating centrifugal refrigerant compressor according to claim 8, characterized in that: The motor housing (1) further comprises: a first cavity (13), wherein the gap between the first air bearing (5) and the first main shaft (302) is connected to the first cavity (13); and a second cavity (12), wherein a gap between the second air bearing (4) and the second main shaft (303) is connected to the second cavity (12); A cooling channel (25) is provided between the motor stator (2) and the fitting body (301), and the cooling channel (25) is configured to connect the first cavity (13) and the second cavity (12).

10. The air-floating centrifugal refrigerant compressor according to claim 9, characterized in that: The motor housing (1) further comprises: A cooling air outlet (27), one end of which is connected to the motor housing. (1) the outside, the other end of the cooling air outlet (27) is connected to the second cavity (12); a motor cooling channel (22) provided on the inner wall of the motor housing (1), the motor cooling channel (22) being arranged around the motor stator (2), and the motor cooling channel (22) being connected to the first cavity (13); and A cooling air inlet (26), one end of the cooling air inlet (26) being connected to the outside of the motor housing (1), and the other end of the cooling air inlet (26) being connected to the motor cooling channel (22).

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