CN216199084U

CN216199084U - Air compressor

Info

Publication number: CN216199084U
Application number: CN202122695622.9U
Authority: CN
Inventors: 谭超; 钟瑞兴; 周宇; 陈玉辉
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-04-05
Anticipated expiration: 2031-11-04

Abstract

The utility model provides an air compressor, which comprises a shell, a motor rotor, a first-stage diffuser and a bearing support, wherein the motor rotor, the first-stage diffuser and the bearing support are positioned in the shell, the first-stage diffuser and the bearing support are fixed on the shell and are arranged at intervals along the rotating axis of the motor rotor, a thrust disc is fixedly sleeved on the motor rotor, thrust bearings are respectively arranged on two opposite sides of a disc body of the thrust disc, the disc body and the thrust bearings of the thrust disc are both positioned between the first-stage diffuser and the bearing support, and the air compressor also comprises: the disc body of the adjusting disc is arranged between the first-stage diffuser and the thrust bearing which is positioned on one side of the thrust disc close to the first-stage diffuser; the adjusting disc is connected with the first-stage diffuser and movably arranged relative to the first-stage diffuser at least along the rotating axis of the motor rotor so as to adjust the distance between the adjusting disc and the bearing support and adjust the axial float gap of the motor rotor, and the problem that the axial float gap of the motor rotor of the air compressor in the prior art is inconvenient to adjust is solved.

Description

Air compressor

Technical Field

The utility model relates to the technical field of air compressors, in particular to an air compressor.

Background

The hydrogen fuel cell automobile is the most strategic breakthrough of the new energy automobile in the 21 st century, has the advantages of high power performance, quick hydrogenation, long endurance and the like, and the air compressor provides a high-pressure air source for a fuel cell system.

Common air compressors include centrifugal air compressors, screw air compressors, scroll air compressors, and the like. Compared with a screw compressor and a scroll compressor, the centrifugal air compressor adopts the dynamic pressure gas bearing, can provide a gas source with a higher pressure ratio, obviously improves the power density and the overall performance of the electric pile, has a series of advantages of small friction loss, high rotating speed, good high-temperature stability, no need of lubricating oil and the like, and has very wide application prospect.

The working principle of the centrifugal air compressor structure with two-stage compression is that the speed and pressure of air near the blades are improved through high-speed rotation of the first-stage impeller, high-speed and high-pressure air is conveyed to the second-stage volute through the connecting pipe, and then the second-stage impeller does work on the second-stage volute to further increase the speed and pressure of the air.

The centrifugal air compressor with two-stage compression uses an air suspension bearing, and the axial clearance of the motor rotor determines whether the bearing can form an air film, wherein the axial clearance of the motor rotor is a clearance which is positioned between a one-stage diffuser and a bearing support and is used for moving parts such as a thrust disc fixed on the motor rotor. If the axial clearance is too large, an air film cannot be formed between the thrust bearing and the thrust disc, and the air compressor can obviously axially float when in operation; if the axial clearance is too small, under the operating condition of high rotating speed, the heat productivity of the bearing is larger, the lubricating coating of the axial bearing is easy to burn out, and after the thrust bearing fails, the rotating shaft of the rotor is easy to collide with a static part, finally the motor rotor is blocked, and the air compressor is abnormally stopped, so that the adjustment of the axial clearance is very important for the operating reliability of the air compressor.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an air compressor, which aims to solve the problem that the axial movement gap of a motor rotor of the air compressor in the prior art is inconvenient to adjust.

In order to achieve the above object, according to an aspect of the present invention, there is provided an air compressor, including a housing, and a motor rotor, a first-stage diffuser, and a bearing support, which are disposed in the housing, the first-stage diffuser and the bearing support are fixed on the housing and spaced apart from each other along a rotation axis of the motor rotor, a thrust disk is fixedly sleeved on the motor rotor to move along with the motor rotor, thrust bearings are respectively disposed on opposite sides of a disk body of the thrust disk, and the disk body and the thrust bearing of the thrust disk are both disposed between the first-stage diffuser and the bearing support, the air compressor further including: the disc body of the adjusting disc is arranged between the first-stage diffuser and the thrust bearing which is positioned on one side of the thrust disc close to the first-stage diffuser; the adjusting disc is connected with the first-stage diffuser and movably arranged relative to the first-stage diffuser at least along the rotation axis of the motor rotor so as to adjust the distance between the disc body of the adjusting disc and the bearing support through the movement of the adjusting disc.

Further, threaded connection between the adjusting disc and the first-stage diffuser is achieved, and the distance between the disc body of the adjusting disc and the bearing support is adjusted through rotation of the adjusting disc.

Furthermore, the adjusting disc comprises a sleeve part which is arranged on one side, close to the first-stage diffuser, of the disc body of the adjusting disc, and the first-stage diffuser comprises a through hole which is sleeved on the sleeve part; the outer peripheral surface of the sleeve portion is provided with an external thread, and the wall surface of the through hole is provided with an internal thread which is in threaded connection with the external thread, so that the first-stage diffuser and the adjusting disc are in threaded connection through the matching of the external thread and the internal thread.

Further, an end of the sleeve portion, which is remote from the disc body of the adjustment disc, is provided with an adjustment groove for inserting a portion of a wrench to rotate the adjustment disc.

Further, the number of the adjustment grooves is plural, and the plural adjustment grooves are arranged at intervals around the circumferential direction of the sleeve portion.

Furthermore, a locking nut is mounted on the sleeve portion and located on one side, away from the disc body of the adjusting disc, of the first-stage diffuser.

Further, a stop washer is arranged between the locking nut and the first-stage diffuser.

Furthermore, a clamping groove for clamping the inner teeth of the stop washer is formed in one end, far away from the disc body of the adjusting disc, of the sleeve portion.

Furthermore, one side of the first-stage diffuser, which is far away from the disc body of the adjusting disc, is provided with an annular flange which is used for being sleeved on the sleeve portion of the adjusting disc, the annular flange is provided with a fastener hole which is used for being connected with a fastener, the fastener hole is perpendicular to the rotating axis of the motor rotor, and one end of the fastener penetrates through the fastener hole and then abuts against the sleeve portion, so that the first-stage diffuser and the adjusting disc are relatively fixed.

Further, one side of the first-stage diffuser, which is close to the disc body of the adjusting disc, is provided with a groove for accommodating at least part of the disc body of the adjusting disc.

By applying the technical scheme of the utility model, the air compressor comprises a shell, a motor rotor, a first-stage diffuser and a bearing support which are arranged in the shell, wherein the first-stage diffuser and the bearing support are fixed on the shell and are arranged at intervals along the rotating axis of the motor rotor, a thrust disc is fixedly sleeved on the motor rotor to move along with the motor rotor, thrust bearings are respectively arranged on two opposite sides of a disc body of the thrust disc, and the disc body and the thrust bearings of the thrust disc are both positioned between the first-stage diffuser and the bearing support, and the air compressor also comprises: the disc body of the adjusting disc is arranged between the first-stage diffuser and the thrust bearing which is positioned on one side of the thrust disc close to the first-stage diffuser; the adjusting disc is connected with the first-stage diffuser and movably arranged relative to the first-stage diffuser at least along the rotation axis of the motor rotor, the distance between the disc body of the adjusting disc and the bearing support is adjusted through the movement of the adjusting disc, the axial float gap of the motor rotor is adjusted to meet the requirement of the operation working condition of the air compressor, the motor rotor of the air compressor is prevented from generating large axial float in the high-speed rotation process, an air film is formed between the thrust bearing and the thrust disc, the operation reliability of the air compressor is improved, repeated disassembly and assembly of the first-stage diffuser and the thrust bearing are avoided, the assembly efficiency and the working efficiency of the air compressor are improved, and the problem that the axial float gap of the motor rotor of the air compressor in the prior art is inconvenient to adjust is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 shows a side view of a first embodiment of a regulating disk of an air compressor according to the utility model;

FIG. 2 shows a half-sectional view of the first embodiment of the adjustment disk shown in FIG. 1;

FIG. 3 illustrates a half-sectional view of a one-stage diffuser mated with the tuning disk shown in FIG. 1; and

fig. 4 shows a half-sectional view of an embodiment of an air compressor according to the present invention.

Wherein the figures include the following reference numerals:

1. a first-stage volute; 2. a first-stage impeller; 3. a first stage diffuser; 31. a through hole; 32. an internal thread; 33. a groove; 4. an adjusting disk; 41. a sleeve portion; 42. an external thread; 43. an adjustment groove; 5. a thrust plate; 6. a thrust bearing; 7. a bearing support; 8. a radial bearing; 9. a motor rotor; 10. a motor stator; 11. a motor cylinder; 12. a secondary radial bearing; 13. a secondary diffuser; 14. comb teeth; 15. a secondary impeller; 16. a second-stage volute; 17. and (4) connecting the pipes.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 4, the present invention provides an air compressor, including a housing, and a motor rotor 9, a first-stage diffuser 3, and a bearing support 7 disposed in the housing, where the first-stage diffuser 3 and the bearing support 7 are fixed on the housing and spaced apart from each other along a rotation axis of the motor rotor 9, a thrust disk 5 is fixedly sleeved on the motor rotor 9 to move along with the motor rotor 9, thrust bearings 6 are respectively disposed on opposite sides of a disk body of the thrust disk 5, and the disk body of the thrust disk 5 and the thrust bearings 6 are both located between the first-stage diffuser 3 and the bearing support 7, and the air compressor further includes: the adjusting disc 4 is arranged between the first-stage diffuser 3 and a thrust bearing 6 which is positioned on one side, close to the first-stage diffuser 3, of the thrust disc 5; the adjusting disk 4 is connected with the first-stage diffuser 3 and movably arranged relative to the first-stage diffuser 3 at least along the rotation axis of the motor rotor 9, so that the distance between the disk body of the adjusting disk 4 and the bearing support 7 is adjusted through the movement of the adjusting disk 4, and the axial play gap of the motor rotor 9 is adjusted.

The air compressor comprises a shell, a motor rotor 9, a first-stage diffuser 3 and a bearing support 7, wherein the motor rotor 9, the first-stage diffuser 3 and the bearing support 7 are arranged in the shell, the first-stage diffuser 3 and the bearing support 7 are fixed on the shell and are arranged at intervals along the rotating axis of the motor rotor 9, a thrust disc 5 is fixedly sleeved on the motor rotor 9 to move along with the motor rotor 9, thrust bearings 6 are respectively arranged on two opposite sides of a disc body of the thrust disc 5, and the disc body of the thrust disc 5 and the thrust bearings 6 are both positioned between the first-stage diffuser 3 and the bearing support 7, and the air compressor also comprises: the adjusting disc 4 is arranged between the first-stage diffuser 3 and a thrust bearing 6 which is positioned on one side, close to the first-stage diffuser 3, of the thrust disc 5; wherein, the adjusting disk 4 is connected with the first-stage diffuser 3 and is movably arranged relative to the first-stage diffuser 3 at least along the rotation axis of the motor rotor 9, so as to adjust the distance between the disc body of the adjusting disc 4 and the bearing support 7 by the movement of the adjusting disc 4, so as to adjust the axial float clearance of the motor rotor 9 to meet the requirement of the operation condition of the air compressor, to prevent large axial bouncing of the motor rotor 9 of the air compressor during high speed rotation, so that an air film is formed between the thrust bearing 6 and the thrust disc 5, the running reliability of the air compressor is improved, repeated disassembly and assembly of the first-stage diffuser and the thrust bearing 6 are avoided, the assembly efficiency and the working efficiency of the air compressor are improved, and the problem that the axial float gap of the motor rotor of the air compressor in the prior art is inconvenient to adjust is solved.

As shown in fig. 4, the air compressor of the present invention mainly comprises a first-stage volute 1, a first-stage impeller 2, a first-stage diffuser 3, a regulating disc 4, a thrust disc 5, a thrust bearing 6, a bearing support 7, a first-stage radial bearing 8, a motor rotor 9, a motor stator 10, a motor cylinder 11, a second-stage radial bearing 12, a second-stage diffuser 13, comb teeth 14, a second-stage impeller 15, a second-stage volute 16, and a connecting pipe 17.

Wherein, along the rotation axis of the motor rotor 9, the first-stage volute 1 and the second-stage volute 16 are respectively positioned at two opposite ends of the motor cylinder 11, and the first-stage volute 1 and the second-stage volute together form a shell of the air compressor; the first-stage volute 1, the second-stage volute 16 and the motor cylinder 11 are all parts with irregular shapes and are generally formed by casting, the first-stage volute 1 is used for being in clearance fit with the first-stage impeller 2 located in the shell, and the second-stage volute 16 is used for being in clearance fit with the second-stage impeller 15 located in the shell and mainly plays a role in suppressing pressure.

The first-stage impeller 2 and the second-stage impeller 15 of the air compressor are both parts with irregular shapes and are formed by programming and processing through a machine tool, the first-stage impeller 2 and the second-stage impeller 15 are both sleeved on the motor rotor 9 and are in interference fit with the motor rotor 9, and in order to increase the connection strength, the first-stage impeller 2, the second-stage impeller 15 and the motor rotor 9 are connected in a positioning mode through an upper cylindrical bolt.

The first-stage diffuser 3 of the air compressor is in threaded connection with the adjusting disc 4, the adjusting disc 4 is sleeved on the outer peripheral surface of a shaft sleeve section of the thrust disc 5 and is in clearance fit with the thrust disc 5, the thrust disc 5 is sleeved on the outer peripheral surface of the motor rotor 9 and is in interference fit with the motor rotor 9, and when the air compressor works, the thrust disc 5 and the motor rotor 9 perform synchronous motion so as to prevent the motor rotor 9 from generating large axial movement.

The thrust bearing 6 of the air compressor is a foil dynamical pressure gas axial bearing and is distributed on two opposite sides of a thrust disc 5, the thrust bearing 6 is sleeved outside a motor rotor 9 and is in clearance fit with the motor rotor 9, the thrust bearing 6 is in clearance fit with the thrust disc 5, the thrust bearing 6 close to one side of a bearing support 7 is fixed on the bearing support 7 through a pin to prevent the thrust bearing 6 from rotating in the circumferential direction, and air between the thrust disc 5 and the foil of the thrust bearing 6 is driven to move through high-speed rotation of the motor rotor 9 to form an air film.

The first-stage diffuser 3, the bearing support 7 and the second-stage diffuser 13 of the air compressor are fixed on the motor cylinder 11 through fasteners and are sleeved outside the motor rotor 9 to be arranged at intervals with the motor rotor 9, in addition, the bearing support 7 and the second-stage diffuser 13 are respectively connected with the first-stage radial bearing 8 and the second-stage radial bearing 12 through fasteners, and the first-stage radial bearing 8 and the second-stage radial bearing 12 are sleeved outside the motor rotor 9.

The first-stage radial bearing 8 and the second-stage radial bearing 12 of the air compressor are supporting points of the motor rotor 9 and are symmetrically arranged at two ends of the motor rotor 9, and when the air compressor runs at a high speed, air films are formed between the motor rotor 9 and the first-stage radial bearing 8 and between the motor rotor and the second-stage radial bearing 12, so that the motor rotor 9 is suspended and is not contacted with the first-stage radial bearing 8 or the second-stage radial bearing 12.

The motor rotor 9 of the air compressor is a solid shaft part which is an important component of a rotor structure of the air compressor and is used for providing support for other rotating parts, and when the air compressor works, the motor rotor 9 rotates at a high speed under the action of an electromagnetic field.

The motor stator 10 of the air compressor of the present invention is mainly composed of windings, and is generally in interference connection with the motor cylinder 11 to be fixed on the motor cylinder 11.

The comb 14 of the air compressor of the present invention is located at one end of the motor rotor 9 close to the secondary diffuser 13 to perform a sealing function.

The connecting pipe 17 of the air compressor of the utility model is a hollow part with an irregular shape, is formed by casting and processing, and mainly has the function of conveying high-pressure gas generated by the primary impeller 2 into the secondary volute 16 so as to further improve the pressure of the gas by the secondary impeller 15.

As shown in fig. 1 to 3, the adjusting disk 4 is screwed to the first-stage diffuser 3 to adjust the distance between the disk body of the adjusting disk 4 and the bearing support 7 by rotating the adjusting disk 4.

Specifically, the adjusting disk 4 comprises a sleeve portion 41 arranged on one side, close to the first-stage diffuser 3, of a disk body of the adjusting disk 4, and the first-stage diffuser 3 comprises a through hole 31 for sleeving the sleeve portion 41; the outer peripheral surface of the sleeve portion 41 is provided with an external thread 42, and the hole wall surface of the through hole 31 is provided with an internal thread 32 for screwing with the external thread 42, so that the first-stage diffuser 3 and the adjusting disk 4 are screwed by the matching of the external thread 42 and the internal thread 32. Therefore, the large circumferential relative motion between the adjusting disc 4 and the first-stage diffuser 3 can be effectively avoided, and the phenomenon that the adjusting disc 4 and the left end face of the left thrust bearing 6 in the figure 4 are subjected to relative movement to generate friction due to the fact that the motor rotates reversely when being started and stopped is avoided.

In fig. 4, the axial direction of the left thrust bearing 6 is not fixed, and a gap of several tenths of a millimeter is provided between the thrust bearing 6 and the disk body of the adjusting disk 4 for the thrust bearing 6 to move. When the air compressor is not in operation, the thrust bearing 6 and the adjusting disc 4 are likely to be contacted because the clearance is too small; when the air compressor works, the motor rotor 9 rotates at a high speed, an air film is formed between the thrust disc 5 and the thrust bearing 6, and the thrust bearing 6 is not contacted with the adjusting disc 4.

As shown in fig. 1 and 2, an end of the sleeve portion 41 remote from the disc body of the adjustment disc 4 is provided with an adjustment groove 43 for inserting a part of a wrench to rotate the adjustment disc 4.

Wherein the number of the adjustment grooves 43 is plural, and the plural adjustment grooves 43 are arranged at intervals around the circumferential direction of the sleeve portion 41.

In an embodiment of the present invention, not shown, a lock nut is mounted on the sleeve portion 41, and the lock nut is located on a side of the one-stage diffuser 3 away from the disc body of the adjustment disc 4.

When the axial float gap of the motor rotor 9 is adjusted, the perpendicularity between the two end faces of the thrust disc 5 and the rotation axis of the motor rotor 9 and the perpendicularity between the two end faces of the disc body of the adjusting disc 4 and the rotation axis of the motor rotor 9 need to be ensured, after the adjusted axial float gap meets the requirement of the operation working condition of the air compressor, the relative position between the adjusting disc 4 and the first-stage diffuser 3 is fixed by adding the locking nut, so that the relative position between the adjusting disc 4 and the first-stage diffuser 3 is prevented from being changed due to the vibration generated in the operation process of the air compressor, and the unstable air film formed between the thrust disc 5 and the thrust bearing 6 due to the inclination of the adjusting disc 4 is effectively avoided.

Further preferably, a lock washer is provided between the lock nut and the one-stage diffuser 3.

The lock washer is a standard component used in cooperation with the lock nut, and a clamping groove for clamping the inner teeth of the lock washer is formed in one end, away from the adjusting disc 4, of the sleeve portion 41.

In an embodiment of the present invention, an annular flange is disposed on a side of the first-stage diffuser 3 away from the disc body of the adjustment disc 4, the annular flange is configured to be sleeved on the sleeve portion 41 of the adjustment disc 4, a fastener hole is disposed on the annular flange, the fastener hole is configured to be connected with a fastener, a hole center line of the fastener hole is perpendicular to a rotation axis of the motor rotor 9, and one end of the fastener passes through the fastener hole and abuts against the sleeve portion 41, so that the first-stage diffuser 3 and the adjustment disc 4 are relatively fixed.

The fastener is a screw, and the fastener hole is a threaded hole matched with the screw in a threaded manner.

As shown in fig. 3, a side of the first-stage diffuser 3 close to the disc body of the tuning disc 4 is provided with a groove 33 for accommodating at least a portion of the disc body of the tuning disc 4, so as to reduce the axial length of the whole assembled first-stage diffuser 3 and tuning disc 4, thereby reducing the whole size of the air compressor and making the structure of the air compressor more compact.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an air compressor, is in including casing and setting electric motor rotor (9), one-level diffuser (3) and bearing bracket (7) in the casing, one-level diffuser (3) with bearing bracket (7) are fixed just follow on the casing the axis of rotation interval of electric motor rotor (9) sets up, fixed cover is equipped with thrust disc (5) on electric motor rotor (9) in order to follow electric motor rotor (9) motion, the relative both sides of the disk body of thrust disc (5) are provided with thrust bearing (6) respectively, the disk body of thrust disc (5) with thrust bearing (6) all are located one-level diffuser (3) with between bearing bracket (7), its characterized in that, air compressor still includes:

the adjusting disc (4), the disc body of the adjusting disc (4) is arranged between the first-stage diffuser (3) and a thrust bearing (6) which is positioned on one side of the thrust disc (5) close to the first-stage diffuser (3);

the adjusting disk (4) is connected with the first-stage diffuser (3) and movably arranged relative to the first-stage diffuser (3) at least along the rotation axis of the motor rotor (9) so as to adjust the distance between the disk body of the adjusting disk (4) and the bearing support (7) through the movement of the adjusting disk (4) to adjust the axial play gap of the motor rotor (9).

2. The air compressor according to claim 1, characterized in that the adjusting disk (4) is in threaded connection with the one-stage diffuser (3) to adjust the distance between the disk body of the adjusting disk (4) and the bearing support (7) by rotating the adjusting disk (4).

3. The air compressor of claim 1,

the regulating disc (4) comprises a sleeve part (41) which is arranged on one side, close to the first-stage diffuser (3), of a disc body of the regulating disc (4), and the first-stage diffuser (3) comprises a through hole (31) which is used for being sleeved on the sleeve part (41);

an external thread (42) is arranged on the outer peripheral surface of the sleeve portion (41), an internal thread (32) for being in threaded connection with the external thread (42) is arranged on the wall surface of the through hole (31), and the primary diffuser (3) and the adjusting disc (4) are in threaded connection through the matching of the external thread (42) and the internal thread (32).

4. An air compressor according to claim 3, characterized in that the end of the sleeve portion (41) remote from the disc body of the adjustment disc (4) is provided with an adjustment groove (43) for a part of a wrench to be inserted for rotating the adjustment disc (4).

5. The air compressor according to claim 4, wherein the number of the adjustment grooves (43) is plural, and the plural adjustment grooves (43) are arranged at intervals around the circumferential direction of the sleeve portion (41).

6. The air compressor according to claim 3, wherein a lock nut is mounted on the sleeve portion (41) on a side of the one-stage diffuser (3) away from a disc body of the adjustment disc (4).

7. The air compressor as claimed in claim 6, wherein a stop washer is provided between the lock nut and the one-stage diffuser (3).

8. The air compressor as claimed in claim 7,

one end, far away from the disc body of the adjusting disc (4), of the sleeve portion (41) is provided with a clamping groove for clamping the internal teeth of the stop washer.

9. The air compressor according to claim 3, wherein an annular flange is arranged on one side of the first-stage diffuser (3) away from the disc body of the adjusting disc (4) and is used for being sleeved on a sleeve portion (41) of the adjusting disc (4), a fastener hole is arranged on the annular flange and is used for being connected with a fastener, a hole center line of the fastener hole is perpendicular to a rotation axis of the motor rotor (9), and one end of the fastener penetrates through the fastener hole and abuts against the sleeve portion (41) so that the first-stage diffuser (3) and the adjusting disc (4) are fixed relatively.

10. The air compressor according to claim 1, characterized in that the side of the first-stage diffuser (3) close to the body of the conditioning disc (4) is provided with a recess (33) for receiving at least part of the body of the conditioning disc (4).