Axial gas dynamic pressure bearing assembly and motor

Abstract

The invention provides an axial gas dynamic pressure bearing assembly and a motor, the axial gas dynamic pressure bearing assembly comprises a first axial bearing, a thrust plate, a second axial bearing and a rotor, the first axial bearing is arranged at the periphery of the rotor and is located at one axial side of the thrust plate; the second axial bearing is arranged on the periphery of the rotor and located on the other axial side of the thrust plate. A third axial bearing is arranged on the rotor, so that the third axial bearing is opposite to the first axial bearing in the axial direction, and a displacement sensor is further arranged between the third axial bearing and the first axial bearing or on at least one of the third axial bearing and the first axial bearing so as to detect the change of the axial distance between the third axial bearing and the first axial bearing. According to the invention, the axial auxiliary support can be provided for the rotor, the main bearing axial bearing structure is protected, the stability and reliability of an axial system are improved, and the problems that the rotor of the existing gas dynamic pressure bearing is not effectively monitored and is easy to lose efficacy when the impact load is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air bearings, and particularly relates to an axial gas dynamic pressure bearing assembly and a motor. Background Art

[0002] Gas dynamic pressure bearings have the advantages of high precision, pollution-free, high speed, and simple structure. At home and abroad, gas dynamic pressure bearings have been widely used in high-speed rotating machinery such as oil-free turbines of aeroengines, micro gas turbines, and air cycle machines of airplanes.

[0003] CN 108869542 A proposes a thrust bearing, a rotor system, and a control method for the thrust bearing, which uses a gas bearing and a magnetic bearing to work together to improve the dynamic performance and stability of the thrust bearing under high-speed operation. CN214404363 U proposes a hybrid bearing device and a centrifugal compressor, which uses a double magnetic levitation thrust bearing and a dynamic pressure thrust bearing to solve the wear problem of the rotor and the dynamic pressure bearing during the start-stop stage.

[0004] The thrust bearings of the above patents use magnetic levitation and air suspension to work together, reducing the wear of the rotor and the dynamic pressure bearing, but increasing the complexity and length of the shafting structure, and there is interference between the working clearances and load-bearing fits of the two bearings. It is necessary to solve the problem of achieving effective load-bearing under different air gap conditions in the hybrid bearing structure to improve the operation stability of high-speed rotors and motors.

[0005] Due to the technical problems that the rotor of the gas dynamic pressure bearing in the prior art has no effective monitoring under large impact loads and is prone to failure, the present invention researches and designs an axial gas dynamic pressure bearing assembly and a motor. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the rotor of the gas dynamic pressure bearing in the prior art has no effective monitoring under large impact loads and is prone to failure, so as to provide an axial gas dynamic pressure bearing assembly and a motor.

[0007] To solve the above problems, the present invention provides an axial gas dynamic pressure bearing assembly, which includes:

[0008] A first axial bearing, a thrust disk, a second axial bearing, and a rotor. The thrust disk is arranged on the rotor and rotates integrally with the rotor. The first axial bearing is arranged on the outer periphery of the rotor and on one axial side of the thrust disk, and the second axial bearing is arranged on the outer periphery of the rotor and on the other axial side of the thrust disk.

[0009] A step surface is formed on the rotor at a position axially opposite to the first axial bearing, and a third axial bearing is arranged at the step surface, so that the third axial bearing is axially opposite to the first axial bearing, and a displacement sensor is also arranged between the third axial bearing and the first axial bearing or on at least one of the two to detect changes in the axial distance between the third axial bearing and the first axial bearing.

[0010] In some embodiments,

[0011] It also includes a first axial bearing housing, which is connected to the first axial bearing and is located on the axial side of the first axial bearing away from the thrust plate, so that the first axial bearing is located between the first axial bearing housing and the thrust plate, and the first axial bearing housing is located between the third axial bearing and the first axial bearing, and the displacement sensor is arranged on a side surface of the first axial bearing housing facing the third axial bearing, and / or on a side surface of the third axial bearing facing the first axial bearing housing.

[0012] In some embodiments,

[0013] The first axial bearing comprises a first axial bearing first end face located at one axial end thereof and a first axial bearing second end face located at the other axial end thereof, the thrust plate comprises a thrust plate first end face located at one axial end thereof, and the first axial bearing first end face is opposite to the thrust plate first end face and a working air gap area A is provided between the two, the axial dimension thereof is a nominal gap a, the safety value is d, and a≥d;

[0014] The second axial bearing comprises a second axial bearing first end face located at one axial end thereof and a second axial bearing second end face located at the other axial end thereof, the thrust plate comprises a thrust plate second end face located at the other axial end thereof, and the second axial bearing first end face is opposite to the thrust plate second end face and a working air gap area B is provided between the two, the axial dimension thereof is a nominal gap b, the safety value is d, and b≥d;

[0015] The third axial bearing comprises a third end face of the third axial bearing located at one axial end thereof, the first axial bearing housing comprises a first end face of the first axial bearing housing located at one axial end thereof, and the third end face of the third axial bearing is opposite to the first end face of the first axial bearing housing, and a working air gap area C is provided between the third end face of the third axial bearing and the axial dimension thereof is a nominal clearance c, a safety value is d, and c≥d;

[0016] And: ca>d.

[0017] In some embodiments,

[0018] 0.8*(ca) <d<0.95*(c-a)。

[0019] In some embodiments,

[0020] Also included is a second axial bearing housing, the second axial bearing housing being connected to the second axial bearing and being located on an axial side of the second axial bearing away from the thrust plate, so that the second axial bearing is located between the second axial bearing housing and the thrust plate;

[0021] The invention also includes a fourth axial bearing, which is arranged on the axial side of the second axial bearing housing away from the second axial bearing, and the axial clearance between the fourth axial bearing and the second axial bearing housing is a nominal clearance c2, the axial clearance between the third axial bearing and the first axial bearing housing is a nominal clearance c1, and: c1+c2 <a+b。

[0022] In some embodiments,

[0023] The third axial bearing is made of ceramic material; when a fourth axial bearing is also included, the fourth axial bearing is also made of ceramic material.

[0024] In some embodiments,

[0025] The step surface of the rotor includes a rotor second end face extending in a radial direction and a rotor third end face extending in an axial direction. The third axial bearing also includes a third axial bearing third end face located at one axial end thereof, a third axial bearing first end face located at the other axial end thereof, and a third axial bearing second end face located at a radial inner end thereof. The third axial bearing first end face is fitted with the rotor second end face, and the third axial bearing second end face is fitted with the rotor third end face. The first axial bearing housing includes a first axial bearing housing first end face located at one axial end thereof, and the third axial bearing third end face is opposite to the first axial bearing housing first end face.

[0026] In some embodiments,

[0027] A first groove structure is provided on the third end surface of the third axial bearing, the first groove structure can accommodate gas to enter so as to provide axial support for the rotor, and the first groove structure has a bending structure at at least one position; and / or,

[0028] A second groove structure is provided on the first end surface of the first axial bearing housing. The second groove structure can also accommodate gas to enter so as to provide axial support for the rotor. The second groove structure also has a bending structure at at least one position.

[0029] In some embodiments,

[0030] When a first groove structure is provided on the third end face of the third axial bearing, when observed from a direction perpendicular to the third end face of the third axial bearing, the first groove structure is a V-shaped groove, including a first air inlet of the V-shaped groove at one end thereof and a second air inlet of the V-shaped groove at the other end thereof. The first groove structure further includes a first V-shaped groove cross region between the first air inlet of the V-shaped groove and the second air inlet of the V-shaped groove, and the first V-shaped groove cross region is the bending position of the first groove structure;

[0031] When a second groove structure is provided on the first end face of the first axial bearing housing, when observed from a direction perpendicular to the first end face of the first axial bearing housing, the second groove structure is also a V-shaped groove, including a third air inlet of the V-shaped groove at one end thereof and a fourth air inlet of the V-shaped groove at the other end thereof. The second groove structure further includes a second V-shaped groove cross region between the third air inlet of the V-shaped groove and the fourth air inlet of the V-shaped groove, and the second V-shaped groove cross region is the bending position of the second groove structure.

[0032] In some embodiments,

[0033] When a first groove structure is provided on the third end face of the third axial bearing, and the first groove structure includes a first air inlet of the V-shaped groove, a second air inlet of the V-shaped groove, and a first V-shaped groove cross region, the first air inlet of the V-shaped groove is located at the outer radial end, the second air inlet of the V-shaped groove is located at the inner radial end, and the first V-shaped groove cross region is respectively communicated with the first air inlet of the V-shaped groove and the second air inlet of the V-shaped groove; and the first groove structure is plural, and the plural first groove structures are arranged at intervals in the circumferential direction;

[0034] When a second groove structure is provided on the first end face of the first axial bearing housing, and the second groove structure includes a third air inlet of the V-shaped groove, a fourth air inlet of the V-shaped groove, and a second V-shaped groove cross region, the third air inlet of the V-shaped groove is located at the outer radial end, the fourth air inlet of the V-shaped groove is located at the inner radial end, and the second V-shaped groove cross region is respectively communicated with the third air inlet of the V-shaped groove and the fourth air inlet of the V-shaped groove; and the second groove structure is plural, and the plural second groove structures are arranged at intervals in the circumferential direction.

[0035] In some embodiments,

[0036] The rotor is of a hollow rotor structure and has a hollow channel inside. The thrust disk includes a second end face of the thrust disk opposite to the second axial bearing. The third axial bearing is provided with a third axial bearing radial ventilation groove. When including a first groove structure, the third axial radial ventilation groove communicates with the first groove structure. One end of the hollow channel can communicate with the second end face of the thrust disk, and the other end of the hollow channel can communicate with the third axial bearing radial ventilation groove, so as to conduct gas to the first groove structure.

[0037] In some embodiments,

[0038] The rotor is provided with a rotor radial ventilation groove, and the thrust disk is provided with a thrust disk radial ventilation groove. The rotor radial ventilation groove extends along the radial direction of the rotor and is opposite to the third axial bearing radial ventilation groove. One end of the rotor radial ventilation groove extends to the outer peripheral surface of the rotor and communicates with the third axial bearing radial ventilation groove, and the other end extends to the inside of the rotor and communicates with the hollow channel. The thrust disk radial ventilation groove extends along the radial direction of the rotor and is opposite to the second end face of the thrust disk. One end of the thrust disk radial ventilation groove extends to the outer peripheral surface of the rotor and communicates with the second end face of the thrust disk, and the other end extends to the inside of the rotor and communicates with the hollow channel.

[0039] The present invention also provides a motor, which includes the aforementioned axial gas dynamic pressure bearing assembly.

[0040] An axial gas dynamic pressure bearing assembly and a motor provided by the present invention have the following beneficial effects:

[0041] 1. By providing a step surface at a position axially opposite to the first axial bearing on the rotor and arranging a third axial bearing at the step surface, the third axial bearing is axially opposite to the first axial bearing, an auxiliary bearing of the pneumatic axial bearing can be formed, and a displacement sensor is also arranged between the third axial bearing and the first axial bearing or on at least one of them to detect the change of the axial distance between the third axial bearing and the first axial bearing, which can effectively monitor whether the rotor runs abnormally. When the rotor is subjected to an impact load or abnormal operation and when the first and second axial bearings are worn, the third axial bearing undertakes part of the supporting role, provides axial auxiliary support for the rotor, protects the main bearing axial bearing structure, improves the stability and reliability of the axial system, and solves the problems that the existing gas dynamic pressure bearings have no effective monitoring and are prone to failure under large impact loads.

[0042] 2. The present invention also ensures that the first axial bearing will not be severely worn during operation by setting the nominal clearance a in the working air gap region of the first axial bearing to a≥d, ensures that the second axial bearing will not be severely worn during operation by setting the nominal clearance b in the working air gap region of the second axial bearing to b≥d, and ensures that the third axial bearing will not be severely worn during operation by setting the nominal clearance c in the working air gap region of the third axial bearing to c≥d. And there is: c - a>d, which can compress the gas between the thrust disc and the first axial bearing when the thrust disc rotates at high speed to provide axial bearing capacity, and the third axial bearing provides part of the axial bearing capacity, effectively protecting the first axial bearing from increased wear; when the rotor is subjected to an impact load or a sudden change in axial force, the clearance between the rotor and the first axial bearing becomes smaller. When the distance between the third axial bearing rotor and the first axial bearing housing approaches the safety clearance, the displacement sensor on the first axial bearing housing transmits the change in the rotor position to the controller and brakes the motor, preventing more serious consequences caused by increased wear of the rotor.

[0043] 3. The present invention also ensures that when the first axial bearing is within the safety clearance d, while maintaining its excellent load-bearing performance, the third axial bearing can operate normally and protect the main bearing by setting the nominal clearance a of the first axial bearing and the nominal clearance c of the third axial bearing to satisfy 0.8*(c - a)<d<0.95*(c - a), further ensuring effective monitoring of the rotor under large impact loads for the gas dynamic pressure bearing and preventing failures and other situations.

[0044] 4. The present invention also forms a groove for accommodating and storing gas on the surface of the third axial bearing opposite to the first axial bearing housing by providing a first groove structure on the third end face of the third axial bearing and / or a second groove structure on the first end face of the first axial bearing housing, providing axial support for the axial gas suspension of the rotor. And by setting a bending structure, air flow deceleration can be formed to generate pressure increase, thereby improving the support performance for the rotor; the present invention also has a hollow rotor structure with a hollow channel inside. A third axial bearing radial ventilation groove is provided on the third axial bearing housing, which can communicate with the hollow channel and conduct gas to the first groove structure, so that gas can be introduced from the inside of the rotor and conducted to the first groove structure, providing gas for the axial gas suspension of the third axial bearing and providing axial support to improve the support performance of the third axial bearing.

[0045] 5. The present invention also improves the support performance by using a ceramic dynamic pressure bearing for the auxiliary bearing, provides axial load before the rotor contacts the load-bearing bearing, and replaces the failure of the main bearing in extreme cases, protecting the load-bearing bearing and the thrust disc and other rotor structures; the present invention also further reduces the wear of the load-bearing bearing during the start-stop stage and further improves the service life of the bearing and the whole machine by designing multiple auxiliary bearings (the third axial bearing and the fourth axial bearing) axially. Description of the Drawings

[0046] Figure 1 is a schematic structural view of the first embodiment of the axial gas dynamic pressure bearing of the present invention;

[0047] Figure 2 is a schematic structural view of the second embodiment of the axial gas dynamic pressure bearing of the present invention;

[0048] Figure 3 is Figure 2 the right view of the third axial bearing in

[0049] Figure 4 is a schematic structural view of the third embodiment of the axial gas dynamic pressure bearing of the present invention;

[0050] Figure 5 is a schematic structural view of the fourth embodiment of the axial gas dynamic pressure bearing of the present invention.

[0051] The reference numerals are represented as:

[0052] 1, housing; 2, stator; 3, rotor; 301, first end face of the rotor; 302, second end face of the rotor; 303, third end face of the rotor; 304, fourth end face of the rotor; 305, radial ventilation groove of the rotor; 4, radial bearing housing; 5, radial bearing; 6, thrust plate; 601, first end face of the thrust plate; 602, second end face of the thrust plate; 603, radial ventilation groove of the thrust plate; 7, first axial bearing; 701, first end face of the first axial bearing; 702, second end face of the first axial bearing; 8, second axial bearing; 801, first end face of the second axial bearing; 802, second end face of the second axial bearing; 9, first axial bearing housing; 901, first end face of the first axial bearing housing; 902, second end face of the first axial bearing housing; 903, second groove structure; 10, second axial bearing housing; 101, first end face of the second axial bearing housing; 102, second end face of the second axial bearing housing; 11, third axial bearing; 111, first end face of the third axial bearing; 112, second end face of the third axial bearing; 113, third end face of the third axial bearing; 114, first groove structure; 114-1, first air inlet of the V-shaped groove; 114-2, first cross-region of the V-shaped groove; 114-3, second air inlet of the V-shaped groove; 115, radial ventilation groove of the third axial bearing; 12, displacement sensor. Detailed embodiments

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0057] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0058] In addition, it should be noted that the use of terms such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0059] As Figures 1-5 shown, the present invention provides an axial hydrodynamic bearing assembly, which includes:

[0060] a first axial bearing 7, a thrust plate 6, a second axial bearing 8 and a rotor 3, wherein the thrust plate 6 is arranged on the rotor 3 and rotates integrally with the rotor 3, the first axial bearing 7 is arranged on the outer periphery of the rotor 3 and on one axial side of the thrust plate 6, and the second axial bearing 8 is arranged on the outer periphery of the rotor 3 and on the other axial side of the thrust plate 6;

[0061] a stepped surface is formed at a position on the rotor 3 axially opposite to the first axial bearing 7, and a third axial bearing 11 is arranged at the stepped surface, such that the third axial bearing 11 is axially opposite to the first axial bearing 7, and a displacement sensor 12 is also arranged between the third axial bearing 11 and the first axial bearing 7 or on at least one of them, so as to be able to detect the change in the axial distance between the third axial bearing 11 and the first axial bearing 7.

[0062] The present invention provides a step surface on the rotor at a position axially opposite to the first axial bearing, and provides a third axial bearing at the step surface, so that the third axial bearing is axially opposite to the first axial bearing, and can form an auxiliary bearing of the pneumatic axial bearing. A displacement sensor is also provided between the third axial bearing and the first axial bearing or on at least one of the two to detect changes in the axial distance between the third axial bearing and the first axial bearing, so as to effectively monitor whether the rotor is running abnormally. When the rotor is subjected to impact load or abnormal operation and when the first and second axial bearings are worn, the third axial bearing assumes a partial supporting role, provides axial auxiliary support for the rotor, protects the main load-bearing axial bearing structure, improves the stability and reliability of the axial system, and solves the problems of the existing gas dynamic pressure bearing having no effective monitoring of the rotor under large impact load and easy failure.

[0063] The present invention provides an axial gas hydrodynamic bearing and a protective structure, which are intended to monitor whether the rotor is running abnormally, provide axial support when the rotor is subjected to impact loads or abnormal operation, protect the main load-bearing axial bearing structure, and solve the problems of existing gas hydrodynamic bearings in which the rotor has no effective monitoring and is prone to failure when subjected to large impact loads.

[0064] In some embodiments,

[0065] It also includes a first axial bearing housing 9, which is connected to the first axial bearing 7 and is located on the axial side of the first axial bearing 7 away from the thrust plate 6, so that the first axial bearing 7 is located between the first axial bearing housing 9 and the thrust plate 6, and the first axial bearing housing 9 is located between the third axial bearing 11 and the first axial bearing 7, and the displacement sensor 12 is arranged on a side surface of the first axial bearing housing 9 facing the third axial bearing 11, and / or on a side surface of the third axial bearing 11 facing the first axial bearing housing 9.

[0066] This is a preferred structural form related to the first axial bearing and the third axial bearing of the present invention. The first axial bearing housing can provide axial support to the first axial bearing, and the third axial bearing is opposite to the first axial bearing housing and the displacement sensor can be arranged on at least one of the two to detect the distance between the two, so that the first axial bearing first provides axial support force to the thrust plate, and when the axial support force is large, the first axial bearing housing moves toward Figure 1The leftward movement shown then provides an axial support force to the first axial bearing housing through the third axial bearing, protecting the first bearing from excessive wear. When the displacement sensor between the third axial bearing and the first axial bearing housing detects that the gap between them is too small, it feeds back to the controller and brakes the motor to prevent the rotor from wearing more severely, thereby improving the stability and reliability of the axial system and further solving the problems such as the rotor having no effective monitoring and being prone to failure under large impact loads in existing gas dynamic pressure bearings.

[0067] The present invention aims at designing an auxiliary bearing for an existing foil gas dynamic pressure axial bearing, which is used to monitor the operation of the rotor and the change of the working clearance of the bearing, undertake part of the supporting role when the main bearing wears, and improve the stability and reliability of the axial system.

[0068] The present invention proposes an axial gas dynamic pressure bearing and a protection structure, as Figure 1 shown, which includes a housing 1, a stator 2 and a high-speed rotor 3; a radial bearing housing 4 supporting the rotor 3 is arranged on one end face of the housing 1, a radial bearing 5 is arranged at the inner hole of the radial bearing housing 4, a thrust plate 6 is arranged on one side of the rotor 3, the first axial bearing 7 and the second axial bearing 8 are arranged on both sides of the thrust plate 6, the first axial bearing 7 and the second axial bearing 8 are respectively fixed on the first axial bearing housing 9 and the second axial bearing housing 10, and are jointly connected to the end faces of the housing 1 and the radial bearing housing 4. A third axial bearing 11 is arranged between the rotor 3 and the thrust plate 6, and a displacement sensor 12 is arranged on the first axial bearing housing 9 to monitor the change of the axial distance between the third axial bearing 11 on the rotor 3 and the first axial bearing housing 9. The axial bearing and its protection structure of the present invention use two dynamic pressure bearings to support the axial displacement of the rotor, and at least one protection bearing is also arranged to reduce the wear of the main load-bearing bearing, improve the service life of the main bearing, and reduce the probability of the whole machine failing.

[0069] In some embodiments,

[0070] The first axial bearing 7 includes a first end face 701 of the first axial bearing at one axial end thereof and a second end face 702 of the first axial bearing at the other axial end thereof. The thrust plate 6 includes a first end face 601 of the thrust plate at one axial end thereof, and the first end face 701 of the first axial bearing is opposite to the first end face 601 of the thrust plate, and the working air gap area therebetween is A, its axial dimension is the nominal clearance a, the safety value is d, and a≥d;

[0071] The second axial bearing 8 includes a first end face 801 of the second axial bearing at one axial end thereof and a second end face 802 of the second axial bearing at the other axial end thereof. The thrust disk 6 includes a second end face 602 of the thrust disk at the other axial end thereof. The first end face 801 of the second axial bearing is opposite to the second end face 602 of the thrust disk, and the working air gap region therebetween is B, the axial dimension thereof is the nominal gap b, the safety value is d, and b≥d;

[0072] The third axial bearing 11 includes a third end face 113 of the third axial bearing at one axial end thereof. The first axial bearing housing 9 includes a first end face 901 of the first axial bearing housing at one axial end thereof. The third end face 113 of the third axial bearing is opposite to the first end face 901 of the first axial bearing housing, and the working air gap region therebetween is C, the axial dimension thereof is the nominal gap c, the safety value is d, and c≥d;

[0073] And: c - a > d.

[0074] In the present invention, by setting the nominal gap a of the working air gap region of the first axial bearing to a≥d, it can be ensured that the first axial bearing will not be severely worn during operation. By setting the nominal gap b of the working air gap region of the second axial bearing to b≥d, it can be ensured that the second axial bearing will not be severely worn during operation. By setting the nominal gap c of the working air gap region of the third axial bearing to c≥d, and c - a > d, when the thrust disk rotates at a high speed, the gas between the thrust disk and the first axial bearing can be compressed to provide axial bearing capacity, and the third axial bearing provides part of the axial bearing capacity, effectively protecting the first axial bearing from excessive wear; when the rotor is subjected to an impact load or an abrupt change in axial force, when the gap between the rotor and the first axial bearing becomes smaller and the distance between the rotor of the third axial bearing and the first axial bearing housing approaches the safety gap, the displacement sensor of the first axial bearing housing transmits the change in the rotor position to the controller and brakes the motor, preventing the rotor from being severely worn and causing more serious consequences.

[0075] The second embodiment of the gas dynamic pressure axial bearing of the present invention is as Figure 2As shown in the figure, two axial bearings are arranged on both axial sides of the thrust disc 6. Preferably, they are foil gas journal bearings, which have good self - adaptability and impact resistance. Among them: The first axial bearing 7 is a load - bearing bearing, providing axial support during the normal operation of the motor; the second axial bearing 8 is an auxiliary bearing, providing axial support when the axial force reverses abnormally. The first axial bearing 7 is fixed on the second end face 902 of the first axial bearing housing. The working air - gap area between the first end face 701 of the first axial bearing and the first end face 601 of the thrust disc is A, the nominal clearance is a, and the safety value is d. In particular, when the actual clearance value a between the thrust disc 6 and the first axial bearing 7 is less than d, dry friction occurs in some local areas between them, which can easily lead to the failure of the axial bearing and further rotor instability. The second axial bearing 8 is fixed on the end face or inside of the second axial bearing housing 10. The working air - gap area between the first end face 801 of the second axial bearing and the second end face 602 of the thrust disc is B, the nominal clearance is b, and the safety value is d. Outside the first axial bearing 7 and the second axial bearing 8, a third axial bearing 11 is arranged on the rotor end face. The working air - gap area between the first end face 901 of the first axial bearing housing and the third end face 113 of the third axial bearing is C, the nominal clearance is c, and the safety value is d.

[0076] To protect the first axial bearing 7, when the nominal clearance c of the third axial bearing is close to the safety clearance d, the nominal clearance of the first axial bearing needs to be greater than the safety clearance, that is, the three need to satisfy the relationship c - a>d. During normal operation, the nominal clearances of the first axial bearing, the second axial bearing, and the third axial bearing are all greater than the safety clearance. The compressed gas between the thrust disc rotating at high speed and the first axial bearing provides axial bearing capacity, and the third axial bearing provides part of the axial bearing capacity. When the rotor is subjected to an impact load or an axial - force mutation, the clearance between the rotor and the axial bearing becomes smaller. When the distance between the rotor of the third axial bearing and the stator of the third axial bearing (i.e., the first axial bearing housing) approaches the safety clearance, the displacement sensor on the first axial bearing housing transmits the change in the rotor position to the controller and brakes the motor, preventing more serious consequences caused by increased rotor wear.

[0077] In some embodiments,

[0078] 0.8*(c - a)<d<0.95*(c - a).

[0079] The present invention also sets the nominal clearance a of the first axial bearing and the nominal clearance c of the third axial bearing to satisfy 0.8*(c - a)<d<0.95*(c - a). When the first axial bearing is within the safety clearance d, while maintaining its excellent load - bearing performance, the third axial bearing can work normally and protect the main bearing, further ensuring effective monitoring of the rotor by the gas journal bearing under large impact loads and preventing failures and other situations.

[0080] The design values of the nominal clearance a of the first axial bearing and the nominal clearance c of the third axial bearing are the most critical. When the nominal clearance c of the third axial bearing is small, the difference between it and the safety clearance decreases, resulting in an increase in the value of the nominal clearance a of the first axial bearing, a decrease in the load-bearing performance, and a decrease in the stability of the axial rotation system. Considering the load-bearing performance of the first axial bearing and the safe working clearance of the third axial bearing, the optimal design value of the nominal clearances of the two should be 0.8*(ca) <d<0.95*(c-a)范围内,能够使得第一轴向轴承在安全间隙d内保持优异承载性能的同时,第三轴向轴承可正常工作并保护主轴承,提高轴向轴承的支撑性能。

[0081] In some embodiments,

[0082] It also includes a second axial bearing housing 10, which is connected to the second axial bearing 8 and is located on the axial side of the second axial bearing 8 away from the thrust plate 6, so that the second axial bearing 8 is located between the second axial bearing housing 10 and the thrust plate 6;

[0083] It also includes a fourth axial bearing, which is arranged on the axial side of the second axial bearing housing 10 away from the second axial bearing 8, and the axial clearance between the fourth axial bearing and the second axial bearing housing 10 is a nominal clearance c2, the axial clearance between the third axial bearing 11 and the first axial bearing housing 9 is a nominal clearance c1, and: c1+c2 <a+b。

[0084] The present invention can also provide axial support to the second axial bearing by setting a second axial bearing housing, and can also provide auxiliary support to the second axial bearing by setting a fourth axial bearing located on the axial side of the second axial bearing housing away from the second axial bearing, thereby protecting the second axial bearing. The present invention can also further reduce the wear of the load-bearing bearing during the start-stop stages and further increase the service life of the bearing and the entire machine by designing multiple auxiliary bearings (third axial bearing and fourth axial bearing) in the axial direction.

[0085] In some embodiments,

[0086] The third axial bearing 11 is made of ceramic material; when a fourth axial bearing is also included, the fourth axial bearing is also made of ceramic material.

[0087] The present invention also improves the supporting performance by using a ceramic hydrodynamic bearing for the auxiliary bearing, provides axial load before the rotor contacts the load-bearing bearing, and replaces the main bearing failure in extreme cases, thereby protecting the rotor structure such as the load-bearing bearing and the thrust plate.

[0088] In some embodiments,

[0089] The stepped surface of the rotor 3 includes a second end surface 302 of the rotor extending in the radial direction and a third end surface 303 of the rotor extending in the axial direction. The third axial bearing 11 further includes a third end surface 113 of the third axial bearing at one axial end thereof, a first end surface 111 of the third axial bearing at the other axial end thereof, and a second end surface 112 of the third axial bearing at its radially inner end. The first end surface 111 of the third axial bearing is arranged in contact with the second end surface 302 of the rotor. The second end surface 112 of the third axial bearing is arranged in contact with the third end surface 303 of the rotor. The first axial bearing housing 9 includes a first end surface 901 of the first axial bearing housing at one axial end thereof, and the third end surface 113 of the third axial bearing is opposite to the first end surface 901 of the first axial bearing housing. Preferably, the radially outer peripheral surface of the third axial bearing does not extend beyond the outer peripheral surface of the rotor 3.

[0090] This is a preferred structural form of the third axial bearing of the present invention, that is, the third end surface of the third axial bearing is opposite to the first end surface of the first axial bearing housing, and a gap and axial support are formed therebetween. The first end surface of the third axial bearing is arranged in contact with the second end surface of the stepped surface of the rotor, and the second end surface of the third axial bearing is arranged in contact with the third end surface of the rotor, forming the setting of the third axial bearing and the support for the first axial bearing housing, thereby forming an auxiliary support for the main bearing (the first axial bearing), protecting the main load-bearing axial bearing structure, improving the stability and reliability of the axial system, and ensuring that the gas dynamic pressure bearing will not fail when subjected to a large impact load.

[0091] In some embodiments,

[0092] A first groove structure 114 (preferably a blind groove) is provided on the third end surface 113 of the third axial bearing. The first groove structure 114 can accommodate gas to enter to provide axial support for the rotor 3. The first groove structure 114 has a bent structure at at least one position; and / or,

[0093] A second groove structure 903 (preferably a blind groove) is provided on the first end surface 901 of the first axial bearing housing. The second groove structure 903 can also accommodate gas to enter to provide axial support for the rotor 3. The second groove structure 903 also has a bent structure at at least one position.

[0094] The present invention also provides a first groove structure on the third end face of the third axial bearing and / or a second groove structure on the first end face of the first axial bearing housing, which can form a groove for accommodating and storing gas on the opposite face of the third axial bearing and the first axial bearing housing, providing axial support for the axial air suspension of the rotor. By providing a bending structure, the air flow can be decelerated and pressurized, thereby improving the support performance for the rotor.

[0095] The third axial bearing of the present invention is as Figure 3 shown, preferably made of ceramic material, and fixed to the second end face 302 and the third end face 303 of the rotor by hot fitting / cold fitting. A V-shaped shallow groove (the first groove structure 114) with a thickness of 0.01 mm - 0.05 mm is engraved on the third end face 113 of the third axial bearing. The rotor drives the V-shaped micro-groove axial bearing rotor to rotate at high speed. Gas is inhaled into the cavity from the first air inlet 114-1 of the V-shaped groove and the second air inlet 114-3 of the V-shaped groove, and high-pressure gas is formed in the first V-shaped groove intersection area 114-2 to provide axial support for the suspension of the rotor 3.

[0096] In some embodiments,

[0097] When the first groove structure 114 is provided on the third end face 113 of the third axial bearing, when observed from a direction perpendicular to the third end face 113 of the third axial bearing, the first groove structure 114 is a V-shaped groove, including a first air inlet 114-1 of the V-shaped groove at one end and a second air inlet 114-3 of the V-shaped groove at the other end. The first groove structure 114 further includes a first V-shaped groove intersection area 114-2 between the first air inlet 114-1 of the V-shaped groove and the second air inlet 114-3 of the V-shaped groove. The first V-shaped groove intersection area 114-2 is the bending position of the first groove structure 114;

[0098] When the second groove structure 903 is provided on the first end face 901 of the first axial bearing housing, when observed from a direction perpendicular to the first end face 901 of the first axial bearing housing, the second groove structure 903 is also a V-shaped groove, including a third air inlet of the V-shaped groove at one end and a fourth air inlet of the V-shaped groove at the other end. The second groove structure 903 further includes a second V-shaped groove intersection area between the third air inlet of the V-shaped groove and the fourth air inlet of the V-shaped groove. The second V-shaped groove intersection area is the bending position of the second groove structure 903.

[0099] This is the preferred structural form of the first groove structure and the second groove structure of the present invention. Gas can be introduced through both the V-shaped groove first air inlet located at one end of the first groove structure and the V-shaped groove first air inlet located at the other end thereof, and a bend is formed in the first V-shaped groove intersection area to slow down the speed and increase the pressure, thereby enhancing the supporting effect of the gas on the bearing. Gas can be introduced through both the V-shaped groove third air inlet located at one end of the second groove structure and the V-shaped groove fourth air inlet located at the other end thereof, and a bend is formed in the second V-shaped groove intersection area to slow down the speed and increase the pressure, thereby enhancing the supporting effect of the gas on the bearing.

[0100] In some embodiments,

[0101] When a first groove structure 114 is provided on the third end face 113 of the third axial bearing, and the first groove structure 114 includes a V-shaped groove first air inlet 114-1, a V-shaped groove second air inlet 114-3, and a first V-shaped groove intersection area 114-2, the V-shaped groove first air inlet 114-1 is located at the outer radial end, the V-shaped groove second air inlet 114-3 is located at the inner radial end, and the first V-shaped groove intersection area 114-2 is respectively communicated with the V-shaped groove first air inlet 114-1 and the V-shaped groove second air inlet 114-3; and a plurality of the first groove structures 114 are arranged at intervals in the circumferential direction;

[0102] When a second groove structure 903 is provided on the first end face 901 of the first axial bearing housing, and the second groove structure 903 includes a V-shaped groove third air inlet, a V-shaped groove fourth air inlet, and a second V-shaped groove intersection area, the V-shaped groove third air inlet is located at the outer radial end, the V-shaped groove fourth air inlet is located at the inner radial end, and the second V-shaped groove intersection area is respectively communicated with the V-shaped groove third air inlet and the V-shaped groove fourth air inlet; and a plurality of the second groove structures 903 are arranged at intervals in the circumferential direction.

[0103] This is a further preferred structural form of the first groove structure of the present invention, that is, the first intake inlet of the V-groove is located at the outer radial end, the second intake inlet of the V-groove is located at the inner radial end, and the first V-groove intersection area is respectively communicated with the first intake inlet of the V-groove and the second intake inlet of the V-groove; and the first groove structure is multiple, and the multiple first groove structures are arranged at intervals in the circumferential direction, which can increase the groove area on the third axial bearing and further improve the gas support performance; a further preferred structural form of the second groove structure, that is, the third intake inlet of the V-groove is located at the outer radial end, the fourth intake inlet of the V-groove is located at the inner radial end, and the second V-groove intersection area is respectively communicated with the third intake inlet of the V-groove and the fourth intake inlet of the V-groove; and the second groove structure is multiple, and the multiple second groove structures are arranged at intervals in the circumferential direction, which can increase the groove area on the first axial bearing housing and further improve the gas support performance.

[0104] In some embodiments,

[0105] The rotor 3 is a hollow rotor structure with a hollow channel inside. The thrust plate 6 includes a second end face 602 of the thrust plate opposite to the second axial bearing 8. The third axial bearing 11 is provided with a third axial bearing radial ventilation groove 115. When the first groove structure 114 is included, the third axial bearing radial ventilation groove 115 is communicated with the first groove structure 114. One end of the hollow channel can be communicated with the second end face 602 of the thrust plate, and the other end of the hollow channel can be communicated with the third axial bearing radial ventilation groove 115 so as to conduct gas into the first groove structure 114.

[0106] The present invention also adopts a hollow rotor structure with a hollow channel inside. The third axial bearing housing is provided with a third axial bearing radial ventilation groove, which can be communicated with the hollow channel and conduct gas into the first groove structure, so that gas can be introduced from the inside of the rotor and conducted to the first groove structure to provide gas for the axial air suspension of the third axial bearing, provide axial support, and improve the support performance of the third axial bearing.

[0107] In some embodiments,

[0108] The rotor 3 is provided with a rotor radial ventilation groove 305, and the thrust disk 6 is provided with a thrust disk radial ventilation groove 603. The rotor radial ventilation groove 305 extends along the radial direction of the rotor 3 and is opposite to the third axial bearing radial ventilation groove 115. One end of the rotor radial ventilation groove 305 extends to the outer peripheral surface of the rotor 3 and communicates with the third axial bearing radial ventilation groove 115, and the other end extends to the inside of the rotor 3 and communicates with the hollow channel. The thrust disk radial ventilation groove 603 extends radially and is opposite to the second end face 602 of the thrust disk. One end of the thrust disk radial ventilation groove 603 extends to the outer peripheral surface of the rotor 3 and communicates with the second end face 602 of the thrust disk, and the other end extends to the inside of the rotor 3 and communicates with the hollow channel.

[0109] This is the preferred structural form on the rotor of the present invention and the preferred structural form on the thrust disk. Through the rotor radial ventilation groove, the third axial bearing radial ventilation groove of the third axial bearing can be communicated with the hollow channel inside the rotor. Through the thrust disk radial ventilation groove, the second end face of the thrust disk can be communicated with the hollow channel, so as to realize guiding the gas at the second end face of the thrust disk rich in gas to the first groove structure of the third axial bearing through the thrust disk radial ventilation groove, the hollow channel of the rotor, the rotor radial ventilation groove and the third axial bearing radial ventilation groove, providing sufficient supporting gas for the axial support of the third axial bearing and improving the supporting performance of the third axial bearing.

[0110] The third embodiment of the axial bearing system of the present invention is as Figure 4 shown. On the basis of the original axial bearing first rotation system, the original solid rotor is replaced with a hollow rotor. A shallow groove (thrust disk radial ventilation groove 603) is opened in the radial direction on the second end face 602 of the thrust disk. The high-pressure gas leaked from the axial bearing is introduced into the third axial bearing radial ventilation groove 115 through the rotor radial ventilation groove 305, increasing the ambient pressure of the third axial bearing and improving the suction efficiency of the second air inlet 114-3 of the V-shaped groove, and suppressing gas blockage.

[0111] The present invention also provides a motor, which includes the aforementioned axial gas dynamic pressure bearing assembly.

[0112] The inventive points of the present invention are as follows:

[0113] 1. An axial load-bearing bearing and an axial protection bearing are arranged, and a displacement sensor is arranged on the end face of the auxiliary bearing to monitor the axial displacement of the rotor; that is, the structure of a gas suspension bearing + an axial bearing + an auxiliary (protection) bearing + a displacement sensor;

[0114] 2. The auxiliary bearing uses a ceramic hydrodynamic bearing, which provides axial load before the rotor contacts the load-bearing bearing and replaces the main bearing failure in extreme cases to protect the rotor structures such as the load-bearing bearing and the thrust disk.

[0115] 3. Design multiple auxiliary bearings, which can reduce the wear of the load-bearing bearing during the start-stop stage and improve the service life of the bearing and the whole machine.

[0116] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and variations can be made without departing from the technical principle of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An axial hydrodynamic bearing assembly, characterized in that: include: A first axial bearing (7), a thrust plate (6), a second axial bearing (8) and a rotor (3), wherein the thrust plate (6) is arranged on the rotor (3) and rotates integrally with the rotor (3), the first axial bearing (7) is arranged on the outer periphery of the rotor (3) and is located on one axial side of the thrust plate (6), and the second axial bearing (8) is arranged on the outer periphery of the rotor (3) and is located on the other axial side of the thrust plate (6); A step surface is formed on the rotor (3) at a position axially opposite to the first axial bearing (7), and a third axial bearing (11) is arranged on the step surface, so that the third axial bearing (11) and the first axial bearing (7) are axially opposite to each other, and a displacement sensor (12) is also arranged between the third axial bearing (11) and the first axial bearing (7) or on at least one of the third axial bearing (11) and the first axial bearing (7) to detect changes in the axial distance between the third axial bearing (11) and the first axial bearing (7).

2. The axial gas dynamic pressure bearing assembly according to claim 1, characterized in that: The invention also comprises a first axial bearing housing (9), wherein the first axial bearing housing (9) is connected to the first axial bearing (7) and is located on the axial side of the first axial bearing (7) away from the thrust plate (6), so that the first axial bearing (7) is located between the first axial bearing housing (9) and the thrust plate (6), and the first axial bearing housing (9) is located between the third axial bearing (11) and the first axial bearing (7), and the displacement sensor (12) is arranged on a side surface of the first axial bearing housing (9) facing the third axial bearing (11) and / or on a side surface of the third axial bearing (11) facing the first axial bearing housing (9).

3. The axial gas dynamic pressure bearing assembly according to claim 2, characterized in that: The first axial bearing (7) comprises a first axial bearing first end face (701) located at one axial end thereof and a first axial bearing second end face (702) located at the other axial end thereof, the thrust plate (6) comprises a thrust plate first end face (601) located at one axial end thereof, and the first axial bearing first end face (701) is opposite to the thrust plate first end face (601), and a working air gap area A is provided between the two, and an axial dimension thereof is a nominal gap a, a safety value is d, and a≥d; The second axial bearing (8) comprises a second axial bearing first end face (801) located at one axial end thereof and a second axial bearing second end face (802) located at the other axial end thereof, the thrust plate (6) comprises a thrust plate second end face (602) located at the other axial end thereof, and the second axial bearing first end face (801) is opposite to the thrust plate second end face (602), and a working air gap area B is provided between the two, and the axial dimension thereof is a nominal gap b, and a safety value is d, and b≥d; The third axial bearing (11) comprises a third axial bearing third end face (113) located at one axial end thereof, the first axial bearing housing (9) comprises a first axial bearing housing first end face (901) located at one axial end thereof, and the third axial bearing third end face (113) is opposite to the first axial bearing housing first end face (901), and a working air gap area C is provided between the two, and an axial dimension thereof is a nominal gap c, a safety value is d, and c≥d; And: ca>d.

4. The axial gas dynamic pressure bearing assembly according to claim 3, characterized in that: 0.8*(ca) <d<0.95*(c-a)。 5. The axial gas dynamic pressure bearing assembly according to claim 2, characterized in that: It also includes a second axial bearing housing (10), the second axial bearing housing (10) being connected to the second axial bearing (8) and being located on the axial side of the second axial bearing (8) away from the thrust plate (6), so that the second axial bearing (8) is located between the second axial bearing housing (10) and the thrust plate (6); The invention also comprises a fourth axial bearing, wherein the fourth axial bearing is arranged on the axial side of the second axial bearing housing (10) away from the second axial bearing (8), and the axial clearance between the fourth axial bearing and the second axial bearing housing (10) is a nominal clearance c2, and the axial clearance between the third axial bearing (11) and the first axial bearing housing (9) is a nominal clearance c1, and: c1+c2 <a+b。 6. The axial gas dynamic pressure bearing assembly according to claim 5, characterized in that: The third axial bearing (11) is made of ceramic material; when a fourth axial bearing is also included, the fourth axial bearing is also made of ceramic material.

7. The axial gas dynamic pressure bearing assembly according to claim 2, characterized in that: The step surface of the rotor (3) includes a rotor second end face (302) extending in a radial direction and a rotor third end face (303) extending in an axial direction. The third axial bearing (11) also includes a third axial bearing third end face (113) located at one axial end thereof, a third axial bearing first end face (111) located at the other axial end thereof, and a third axial bearing second end face (112) located at a radial inner end thereof. The third axial bearing first end face (111) is arranged in close contact with the rotor second end face (302), and the third axial bearing second end face (112) is arranged in close contact with the rotor third end face (303). The first axial bearing housing (9) includes a first axial bearing housing first end face (901) located at one axial end thereof, and the third axial bearing third end face (113) is opposite to the first axial bearing housing first end face (901).

8. The axial gas dynamic pressure bearing assembly according to claim 7, characterized in that: A first groove structure (114) is provided on the third end face (113) of the third axial bearing, and the first groove structure (114) can accommodate gas to enter so as to provide axial support for the rotor (3). The first groove structure (114) has a bent structure at at least one position; and / or, A second groove structure (903) is provided on the first end face (901) of the first axial bearing housing, and the second groove structure (903) can also accommodate gas to enter so as to provide axial support for the rotor (3). The second groove structure (903) also has a bent structure at at least one position.

9. The axial gas dynamic pressure bearing assembly according to claim 8, wherein: When the first groove structure (114) is provided on the third end face (113) of the third axial bearing, when viewed in a direction perpendicular to the third end face (113) of the third axial bearing, the first groove structure (114) is a V-shaped groove, including a first air inlet (114-1) of the V-shaped groove at one end thereof and a second air inlet (114-3) of the V-shaped groove at the other end thereof. The first groove structure (114) further includes a first V-shaped groove intersection area (114-2) between the first air inlet (114-1) of the V-shaped groove and the second air inlet (114-3) of the V-shaped groove. The first V-shaped groove intersection area (114-2) is the bent position of the first groove structure (114); When the second groove structure (903) is provided on the first end face (901) of the first axial bearing housing, when viewed in a direction perpendicular to the first end face (901) of the first axial bearing housing, the second groove structure (903) is also a V-shaped groove, including a third air inlet of the V-shaped groove at one end thereof and a fourth air inlet of the V-shaped groove at the other end thereof. The second groove structure (903) further includes a second V-shaped groove intersection area between the third air inlet of the V-shaped groove and the fourth air inlet of the V-shaped groove. The second V-shaped groove intersection area is the bent position of the second groove structure (903).

10. The axial gas dynamic pressure bearing assembly according to claim 9, wherein: When the first groove structure (114) is provided on the third end face (113) of the third axial bearing, and the first groove structure (114) includes a first air inlet (114-1) of the V-shaped groove, a second air inlet (114-3) of the V-shaped groove, and a first V-shaped groove intersection area (114-2), the first air inlet (114-1) of the V-shaped groove is located at the outer radial end, the second air inlet (114-3) of the V-shaped groove is located at the inner radial end, and the first V-shaped groove intersection area (114-2) is respectively communicated with the first air inlet (114-1) of the V-shaped groove and the second air inlet (114-3) of the V-shaped groove; and the first groove structure (114) is plural, and the plural first groove structures (114) are arranged at intervals in the circumferential direction of the third axial bearing (11); When a second groove structure (903) is provided on the first end face (901) of the first axial bearing housing, and the second groove structure (903) includes a V-shaped groove third air inlet, a V-shaped groove fourth air inlet, and a second V-shaped groove intersection area, the V-shaped groove third air inlet is located at the outer radial end, the V-shaped groove fourth air inlet is located at the inner radial end, and the second V-shaped groove intersection area is respectively communicated with the V-shaped groove third air inlet and the V-shaped groove fourth air inlet; and the second groove structure (903) is multiple, and the multiple second groove structures (903) are arranged at intervals in the circumferential direction of the first axial bearing housing (9).

11. The axial gas dynamic pressure bearing assembly according to claim 8, wherein: The rotor (3) is a hollow rotor structure and has a hollow channel inside. The thrust plate (6) includes a second end face (602) of the thrust plate opposite to the second axial bearing (8). The third axial bearing (11) is provided with a third axial bearing radial ventilation groove (115). When a first groove structure (114) is included, the third axial bearing radial ventilation groove (115) is communicated with the first groove structure (114). One end of the hollow channel can be communicated with the second end face (602) of the thrust plate, and the other end of the hollow channel can be communicated with the third axial bearing radial ventilation groove (115) so as to conduct gas into the first groove structure (114).

12. The axial gas dynamic pressure bearing assembly according to claim 11, wherein: The rotor (3) is provided with a rotor radial ventilation groove (305), and the thrust plate (6) is provided with a thrust plate radial ventilation groove (603). The rotor radial ventilation groove (305) extends along the radial direction of the rotor (3) and is opposite to the third axial bearing radial ventilation groove (115). One end of the rotor radial ventilation groove (305) extends to the outer peripheral surface of the rotor (3) and is communicated with the third axial bearing radial ventilation groove (115), and the other end extends to the inside of the rotor (3) and is communicated with the hollow channel. The thrust plate radial ventilation groove (603) extends along the radial direction and is opposite to the second end face (602) of the thrust plate. One end of the thrust plate radial ventilation groove (603) extends to the outer peripheral surface of the rotor (3) and is communicated with the second end face (602) of the thrust plate, and the other end extends to the inside of the rotor (3) and is communicated with the hollow channel.

13. A motor, characterized in that: Including the axial gas dynamic pressure bearing assembly according to any one of claims 1-12.

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