A rotating shaft assembly, a motor and a compressor

Abstract

The present invention provides a rotating shaft assembly, a motor, and a compressor. The bearing assembly includes a rotating shaft and an axial bearing assembly. The rotating shaft has a first end surface in the radial direction. The axial bearing assembly includes an axial bearing stator disposed on the rotating shaft, the axial bearing stator being arranged opposite the first end surface, and an axial gap being defined between the axial bearing stator and the first end surface. The rotating shaft is a bearing rotor, so that a gas dynamic pressure bearing is formed between the rotating shaft and the axial bearing assembly. In the present invention, the rotating shaft is a bearing rotor, eliminating the axial thrust plate structure, thereby reducing the axial length of the rotating shaft.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a rotating shaft assembly, a motor and a compressor. Background Art

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

[0003] CN211343736U proposes a thrust air bearing, a rotor system and a micro gas turbine, such as the prior art Figure 1 As shown, the first stator 130 and the second stator 140 of the thrust air bearing are fixedly connected to form a bearing stator, and the first anti-rotation component 170 connects the two in the circumferential direction and fixes them. The thrust disc 120 fixedly mounted on the rotating shaft or integrally formed with the rotating shaft serves as the bearing rotor. CN215682038U proposes a magnetic levitation high-speed asynchronous motor without a thrust disc, such as the prior art Figure 2 As shown, the magnetic conductive surfaces of the first and second shoulders of the motor shaft are connected to the stator magnetic circuit support end of the axial bearing. The stator magnetic circuit of the axial bearing provides a force to the outer end faces of the first and second shaft segments, respectively, without the need for a thrust plate. This saves space inside the motor and reduces the overall cost of the motor. Therefore, it can be seen that installing an air bearing on an existing rotating shaft requires a thrust plate, which increases the space required inside the motor. Even if the thrust plate is eliminated, a magnetic bearing must be used to form a circuit to suspend the rotor under magnetic force. Furthermore, when using a gas dynamic pressure bearing, the setting of the bearing air gap must also be considered, especially when both radial and axial bearings are provided. Summary of the Invention

[0004] The present invention provides a rotating shaft assembly, a motor and a compressor, wherein the end surface of the rotating shaft is a bearing rotor, thereby reducing the axial disc structure in the prior art and shortening the axial length of the rotating shaft.

[0005] The present invention provides a rotating shaft assembly, which includes a rotating shaft and an axial bearing assembly;

[0006] The rotating shaft has a first end surface in the radial direction;

[0007] The axial bearing assembly includes an axial bearing stator that is passed through the rotating shaft. The axial bearing stator is arranged opposite to the first end face, and an axial gap is provided between the axial bearing stator and the first end face. The rotating shaft is a bearing rotor, so that a gas dynamic pressure bearing is formed between the rotating shaft and the axial bearing assembly.

[0008] In some embodiments, the axial bearing assembly further includes an axial bearing seat, which is passed through the rotating shaft and has a second end face opposite to the first end face, and the axial bearing stator is arranged on the second end face or the first end face.

[0009] In some embodiments, the axial bearing stator is a foil structure or a spiral groove structure.

[0010] In some embodiments, a radial bearing assembly is further included, and the radial bearing assembly includes a radial bearing seat and a radial bearing stator disposed on the radial bearing seat, and a gas dynamic pressure bearing is formed between the rotating shaft and the radial bearing stator.

[0011] In some embodiments, the axial bearing stator is a spiral groove structure, which is opened on the first end face or the second end face; the spiral groove structure includes a first air inlet groove, a second air inlet groove and a plurality of dynamic pressure generating grooves arranged at intervals, the first air inlet groove is located on the inner side of the second air inlet groove, and the two ends of the plurality of dynamic pressure generating grooves are respectively connected to the first air inlet groove and the second air inlet groove.

[0012] In some embodiments, the radial bearing seat has a ventilation groove, and the radial bearing seat has a plurality of air guide holes evenly distributed along the axial direction, and the ventilation groove is connected to the second air guide groove.

[0013] In some embodiments, the axial bearing assembly further includes a diffuser, and the axial bearing seat is disposed on the diffuser.

[0014] In some embodiments, the rotating shaft is provided with a receiving groove with a step structure, the end face of the receiving groove in the radial direction of the rotating shaft is a first end face, and the end face of the receiving groove parallel to the axial direction of the rotating shaft is a third end face; the axial bearing seat has a fourth end face parallel to the third end face, and comb teeth are respectively provided on the third end face and the fourth end face.

[0015] A motor includes a rotating shaft assembly, which is the rotating shaft assembly mentioned above.

[0016] A compressor includes a motor, which is the motor mentioned above.

[0017] The present invention provides a rotating shaft assembly, a motor, and a compressor, which have the following beneficial effects:

[0018] As the shaft rotates, the axial bearing stator remains stationary and parallel to the first end face. As the shaft rotates, viscous, high-speed gas enters the axial gap, forming a high-pressure lubricating gas film that provides load-bearing capacity for the axial rotation system and limits the shaft's axial position. The shaft is a bearing rotor, eliminating the axial thrust plate. The shaft and axial bearing stator form a gas dynamic pressure bearing, reducing the shaft's axial length, improving shaft strength, and lowering motor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0020] Figure 1 It is a schematic diagram of the prior art;

[0021] Figure 2 It is a schematic diagram of the prior art;

[0022] Figure 3 Schematic diagram of a rotating shaft assembly when the axial bearing stator of an embodiment of the present invention is a foil structure;

[0023] Figure 4 Schematic diagram of the axial bearing stator when the axial bearing stator of an embodiment of the present invention is a foil structure;

[0024] Figure 5 This is a schematic diagram of an axial bearing stator of an embodiment of the present invention having a spiral groove structure provided on the second end surface;

[0025] Figure 6 This is a schematic diagram of an axial bearing stator provided on a second end surface when the axial bearing stator has a spiral groove structure according to an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of a dynamic pressure generating groove provided on the second end surface of the axial bearing stator of an embodiment of the present invention when the stator has a spiral groove structure;

[0027] Figure 8 This is a schematic diagram of an axial bearing stator of an embodiment of the present invention having a spiral groove structure provided on a first end surface;

[0028] Figure 9 This is a schematic diagram of an axial bearing stator provided on a first end surface when the axial bearing stator has a spiral groove structure according to an embodiment of the present invention;

[0029] Figure 10 Schematic diagram of a dynamic pressure generating groove provided on a first end surface of an axial bearing stator having a spiral groove structure according to an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of a diffuser provided on the second end surface when the axial bearing stator has a spiral groove structure according to an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of an axial bearing stator having a foil structure according to an embodiment of the present invention;

[0032] Figure 13 This is a partially enlarged cross-sectional view of the axial bearing stator of an embodiment of the present invention, which is a foil structure.

[0033] Figures: 1-rotating shaft; 11-accommodating groove; 101-first end face; 102-third end face; 103-fifth end face; 2-axial bearing stator; 21-axial gap; 201-first air inlet groove; 202-second air inlet groove; 203-dynamic pressure generating groove; 231-first groove body; 232-second groove body; 233-intersection; 3-axial bearing seat; 301-second end face; 302-fourth end face; 4-radial bearing seat; 41- Ventilation groove; 5-radial bearing stator; 501-sixth end face; 6-diffuser; 811-axial flat foil flat section; 812-axial flat foil inclined section; 813-axial flat foil bearing section; 814-axial flat foil adjustment structure; 822-axial first layer gasket support section; 832-axial second layer gasket support section; 841-axial corrugated foil flat section; 842-axial corrugated foil support section; 851-axial bottom plate flat section; 853-axial bottom plate adjustment structure. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] See also Figure 3 、 Figure 5 and Figure 8 As shown, according to an embodiment of the present invention, a rotating shaft assembly is provided, which includes a rotating shaft 1 and an axial bearing assembly; the rotating shaft 1 has a first end face 101 in the radial direction; the axial bearing assembly includes an axial bearing stator 2 penetrated on the rotating shaft 1, the axial bearing stator 2 is arranged opposite to the first end face 101, and an axial gap 21 is provided between the axial bearing stator 2 and the first end face 101; the rotating shaft 1 is a bearing rotor, so that a gas dynamic pressure bearing is formed between the rotating shaft 1 and the axial bearing assembly.

[0039] In this embodiment, when the shaft 1 rotates, the axial bearing stator 2 remains stationary and does not rotate with the shaft 1. The axial bearing stator 2 is parallel to the first end surface 101. When the shaft 1 rotates, viscous, high-speed gas enters the axial gap 21, forming a high-pressure lubricating gas film, which provides load-bearing capacity for the axial rotation system and achieves axial position limitation of the shaft 1. The shaft 1 is a bearing rotor, eliminating the axial thrust plate structure. The shaft 1 and the axial bearing stator 2 form a gas dynamic pressure bearing, thereby reducing the axial length of the shaft 1, improving the strength of the shaft 1, and lowering the cost of the motor.

[0040] The rotating shaft 1 is provided with a stepped receiving groove 11. The end face of the receiving groove 11 in the radial direction of the rotating shaft 1 is a first end face 101, and the end face of the receiving groove 11 parallel to the axial direction of the rotating shaft 1 is a third end face 102. A fifth end face 103 is provided along the axial direction of the rotating shaft 1, that is, the large end of the rotating shaft 1 has the fifth end face 103. In this embodiment, the receiving groove 11 is provided to accommodate the axial bearing stator 2. This arrangement enables the end face of the axial bearing stator 2 to face the first end face 101, thereby achieving compression of the flowing gas after it flows in.

[0041] The axial bearing assembly also includes an axial bearing seat 3, which is passed through the rotating shaft 1. The axial bearing stator 2 passed through the rotating shaft 1 is located in the accommodating groove 11. The axial bearing seat 3 has a second end face 301 arranged opposite to the first end face 101, and the axial bearing stator 2 is arranged on the second end face 301 or the first end face 101.

[0042] In this embodiment, since the gas hydrodynamic bearing adopts gas lubrication, a hydrodynamic gas film with a certain pressure is formed in the axial gap 21. The axial bearing stator 2 can be set on the first end face 101 of the rotating shaft 1, and can also be set on the second end face 301 of the axial bearing seat 3. The flowing gas in the axial gap 21 can be compressed during the rotation of the rotating shaft 1.

[0043] The axial bearing stator 2 is a foil structure or a spiral groove structure. In this embodiment, the foil structure and the spiral groove structure can form a gas dynamic pressure bearing with the rotating shaft 1, and are non-contact with the rotating shaft 1, and do not require an external gas source.

[0044] As a specific implementation method, refer to Figure 3 and Figure 4 When the axial bearing stator 2 is a foil structure, the foil structure is disposed on the second end surface 301 and is parallel to the first end surface 101. The gas dynamic pressure bearing formed by the foil structure and the rotating shaft 1 is an adaptive gas dynamic pressure bearing that uses a single or multiple layers of elastic metal foil as a flexible support surface. It utilizes the elastic deformation of the flexible support structure and Coulomb friction to provide stiffness and damping for the bearing.

[0045] As a specific implementation method, refer to Figure 12 and Figure 13The foil structure includes an axial flat foil, an axial first-layer gasket, an axial second-layer gasket, an axial corrugated foil, and an axial bottom plate. The specific structure comprises an axial flat foil flat section 811, an axial flat foil inclined section 812, an axial flat foil bearing section 813, an axial flat foil adjustment structure 814; an axial first-layer gasket support section 822; an axial second-layer gasket support section 832; an axial corrugated foil flat section 841, an axial corrugated foil support section 842; an axial bottom plate flat section 851, an axial bottom plate slot, and an axial bottom plate adjustment structure 853. The working process is as follows: when the axial bearing is operating, ambient gas is carried from the axial flat foil inclined section 812 into the axial flat foil bearing section 813 due to the high-speed rotation of the motor rotor. Due to the reduction in the cross-sectional area of ​​the air gap through which the gas flows, compression occurs, forming a high-pressure lubricating gas film between the axial flat foil bearing section 813 and the first end face 101 of the rotating shaft 1, providing axial support for the stable operation of the motor rotor-axial rotation system.

[0046] In this embodiment, referring to Figures 5 to 10 When the axial bearing stator 2 has a spiral groove structure, the spiral groove structure can be provided on the first end surface 101 of the rotating shaft 1 or on the second end surface 301 of the axial bearing seat 3 .

[0047] See also Figure 7 and Figure 10 The spiral groove structure includes a first air inlet groove 201, a second air inlet groove 202, and a plurality of spaced-apart dynamic pressure generating grooves 203. The first air inlet groove 201 is located inside the second air inlet groove 202, and the two ends of the plurality of dynamic pressure generating grooves 203 are respectively connected to the first air inlet groove 201 and the second air inlet groove 202. In this embodiment, the first end face 101 and the second end face 301 are both circular, and the first air inlet groove 201 and the second air inlet groove 202 respectively draw gas into the dynamic pressure generating groove 203. When the rotating shaft 1 rotates at high speed, the flowing gas in the axial gap 21 is pressed into the dynamic pressure generating groove 203, thereby generating pressure to achieve non-contact maintenance of the rotating shaft 1 in the axial direction.

[0048] As a specific embodiment, the dynamic pressure generating groove 203 includes a first groove body 231 and a second groove body 232 that are interconnected. The interconnected first groove body 231 and the second groove body 232 are V-shaped, and the connection between the first groove body 231 and the second groove body 232 forms an intersection 233. The first groove body 231 is located on the inner side of the second groove body 232. The first groove body 231 is connected to the first air induction groove 201, and the second groove body 232 is connected to the second air induction groove 202. The air inlets of the first groove body 231 and the second groove body 232 are wide on the outside and narrow on the inside, deep on the outside and shallow on the inside. That is, the grooves of the first groove body 231 and the second groove body 232 are narrowest and shallowest at the intersection 233. In this embodiment, the dynamic pressure generating groove 203 adopts this method, which can gradually compress the flowing gas to form a high-pressure air film as the cross-sectional area of ​​the first groove body 231 and the second groove body 232 becomes smaller and smaller. It is worth noting that when the dynamic pressure generating groove 203 is opened on the first end surface 101, the preferred method is that only the first groove body 231 and the second groove body 232 are opened on the first end surface 101, and the first air inlet groove 201 and the second air inlet groove 202 are still arranged on the second end surface 301.

[0049] As a specific embodiment, the pressure generated by the dynamic pressure generating groove 203 varies with the angle, groove width, groove length, groove depth, number of grooves, and flatness of the first and second groove bodies 231, 232. Furthermore, the pressure generated by the dynamic pressure generating groove 203 is also related to the rotational speed of the rotating shaft 1 and the axial clearance 21. The parameters of the dynamic pressure generating groove 203 can be designed based on actual operating conditions. The dynamic pressure generating groove 203 can be formed on the axial bearing seat 3 or the rotating shaft 1 by forging, rolling, etching, or stamping.

[0050] It also includes a radial bearing assembly, which includes a radial bearing seat 4 and a radial bearing stator 5 arranged on the radial bearing seat 4. A gas dynamic pressure bearing is formed between the rotating shaft 1 and the radial bearing stator 5.

[0051] Specifically, when the axial bearing stator 2 has a foil structure, the foil structure is mounted on the axial bearing seat 3, and the radial bearing stator 5 also has a foil structure. When the axial bearing stator 2 has a spiral groove structure, the axial bearing stator 2 is provided on the first end surface 101 or the second end surface 301, and the radial bearing stator 5 has a spiral groove structure or a foil structure. In other embodiments, the radial bearing stator 5 and the rotating shaft 1 may form a gas dynamic pressure bearing.

[0052] As a specific embodiment, the radial bearing stator 5 has a sixth end face 501 parallel to the fifth end face 103, and the axial bearing seat 3 has a fourth end face 302 parallel to the third end face 102. The radial bearing seat 4 is disposed on the large end of the rotating shaft 1, and the axial bearing seat 3 is connected to the radial bearing seat 4. After connection, the second end face 301 of the axial bearing seat 3 is parallel to the first end face 101 of the rotating shaft 1, the fourth end face 302 of the axial bearing seat 3 is parallel to the third end face 102 of the rotating shaft 1, and the sixth end face 501 of the radial bearing stator 5 is parallel to the fifth end face 103 of the rotating shaft 1.

[0053] In this embodiment, the gap δ between the sixth end face 501 of the radial bearing stator 5 and the fifth end face 103 of the rotating shaft 1 is between 0.05 mm and 0.2 mm, and varies according to the radius of the rotating shaft 1. The length l1 of the first end face 101 of the rotating shaft 1 is the difference between the radius r1 of the large end of the rotating shaft 1 and the radius r2 of the third end face 102 of the rotating shaft 1. In order to meet actual use requirements and reliability requirements, the length l1 of the first end face 101 of the rotating shaft 1 needs to satisfy l1=N1*r1. Depending on the value of the radius r1, the value of N1 is between 0.3 and 0.6. The larger the value of the rotor radius r1, the smaller the value of N1.

[0054] In this embodiment, radial bearing seat 4 has a ventilation groove 41 and a plurality of air guide holes evenly distributed along the axial direction. Ventilation groove 41 is connected to second air inlet groove 202. In this embodiment, the ventilation groove 41 is connected to second air inlet groove 202, and the entire shaft assembly exchanges air with the axial bearing assembly and the radial bearing assembly, thereby maintaining the air pressure balance within the axial bearing assembly and the radial bearing assembly, and preventing a large difference in air pressure between the two.

[0055] As a specific embodiment, when the rotating shaft 1 is arranged horizontally (the direction shown in the figure of this embodiment), the first air inlet groove 201 is arranged below the second air inlet groove 202, and in the direction perpendicular to the rotating shaft 1, the length of the second air inlet groove 202 in the radial direction is greater than the length of the second air inlet groove 202 in the radial direction, so that the air in the ventilation groove 41 can be concentrated and flowed into the second air inlet groove 202, thereby accelerating the gas flow speed, improving the heat dissipation efficiency of the bearing system, reducing the heat dissipation efficiency of the bearing system, reducing the temperature rise of the bearing system, and improving the bearing load-bearing capacity. The provision of the first air inlet groove 201 can store the flowing gas, provide gas for the dynamic pressure generating groove 203, and prevent the gas from being blocked between the fourth end face 302 of the axial bearing seat 3 and the third end face 102 of the rotating shaft 1, thereby avoiding the gap between the first end face 101 and the second end face 301 becoming smaller and causing wear.

[0056] As a specific embodiment, when the axial bearing stator 2 is disposed on the second end surface 301, the gap δ1 between the second end surface 301 and the first end surface 101 is between 0.01 mm and 0.05 mm, depending on the size of the shaft 1. The larger the radius R1 of the shaft 1, the larger the gap. The gap δ2 between the third end surface 102 and the fourth end surface 302 is between 0.05 mm and 0.3 mm, depending on the design. There are two possible scenarios for the gap δ2 between the third end surface 102 and the fourth end surface 302. In one scenario, dynamic pressure generating grooves 203 are also provided on the third end surface 102 to provide radial support during high-speed operation of the shaft 1. In this scenario, the gap δ2 is smaller. In another scenario, comb teeth are provided on each of the third end surface 102 and the fourth end surface 302 to prevent gas from entering the axial gap 21. In this scenario, the gap δ2 is larger, between 0.1 mm and 0.3 mm.

[0057] In this embodiment, referring to Figure 11 When the axial bearing stator 2 is positioned on the second end surface 301, the axial bearing assembly further includes a diffuser 6. The axial bearing seat 3 is mounted on the diffuser 6, and the diffuser 6 is connected to the radial bearing seat 4. The axial bearing seat 3 and the diffuser 6 can be made of different materials, eliminating the problem of material limitations leading to processing difficulties and simplifying the manufacturing process. Furthermore, the diffuser 6 has diverse structural designs, and the overall structure is simple and flexible to assemble. The diffuser 6 primarily increases its cross-sectional area to reduce gas velocity, thereby reducing pressure loss. It also serves to collect and channel gas.

[0058] In this embodiment, gas dynamic pressure bearings are respectively formed between the radial bearing stator 5 and the axial bearing stator 2 and the rotating shaft 1. When the rotating shaft 1 rotates at high speed, flowing gas with a certain viscosity is continuously brought into the radial bearing stator 5 and the axial bearing stator 2. The high-pressure gas film formed in the radial direction by the radial bearing stator 5 and the rotating shaft 1 can support the high-speed rotation of the rotating shaft 1, and the high-pressure gas film formed in the axial direction by the axial bearing stator 2 and the rotating shaft 1 can suppress the axial movement of the rotating shaft 1.

[0059] When the rotating shaft 1 is provided with both a radial bearing assembly and an axial bearing assembly, the axial bearing seat 3 is connected to the radial bearing seat 4. When the axial bearing stator 2 is a foil structure, the foil structure is arranged on the axial bearing seat 3, and the radial bearing stator 5 is arranged on the radial bearing seat 4. At this time, the radial bearing stator 5 is also a foil structure. When the axial bearing stator 2 is a spiral groove structure, the spiral groove structure is opened on the second end face 301. The radial bearing stator 5 can be either a foil structure or a spiral groove structure. When the spiral groove structure is opened on the first end face 101, the second end face 301 of the axial bearing seat 3 is a smooth surface. The radial bearing stator 5 can be either a foil structure or a spiral groove structure. The axial bearing stator 2 and the radial bearing stator 5 in the present invention can be combined in different ways and can be flexibly combined according to usage requirements.

[0060] A motor includes a rotating shaft assembly, which is the rotating shaft assembly mentioned above.

[0061] A compressor includes a motor, which is the motor mentioned above.

[0062] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A rotating shaft assembly, characterized in that: include: A rotating shaft (1) and an axial bearing assembly; The rotating shaft (1) has a first end surface (101) in the radial direction; The axial bearing assembly comprises an axial bearing stator (2) which is inserted into the rotating shaft (1); the axial bearing stator (2) is arranged opposite to the first end face (101); an axial gap (21) is provided between the axial bearing stator (2) and the first end face (101); the rotating shaft (1) is a bearing rotor, so that a gas dynamic pressure bearing is formed between the rotating shaft (1) and the axial bearing assembly; The axial bearing assembly further comprises an axial bearing seat (3); The invention also includes a radial bearing assembly, which includes a radial bearing seat (4) and a radial bearing stator (5) arranged on the radial bearing seat (4). The radial bearing seat (4) is passed through the large end of the rotating shaft (1). The axial bearing seat (3) is connected to the radial bearing seat (4). A gas dynamic pressure bearing is formed between the rotating shaft (1) and the radial bearing stator (5).

2. The shaft assembly according to claim 1, wherein: The axial bearing assembly further comprises an axial bearing seat (3), wherein the axial bearing seat (3) is disposed on the rotating shaft (1), and the axial bearing seat (3) has a second end face (301) disposed opposite to the first end face (101), and the axial bearing stator (2) is disposed on the second end face (301) or the first end face (101).

3. The shaft assembly according to claim 2, wherein: The axial bearing stator (2) is a foil structure or a spiral groove structure.

4. The shaft assembly according to claim 3, wherein: The axial bearing stator (2) is a spiral groove structure, and the spiral groove structure is opened on the first end surface (101) or the second end surface (301); the spiral groove structure includes a first air inlet groove (201), a second air inlet groove (202) and a plurality of dynamic pressure generating grooves (203) arranged at intervals, the first air inlet groove (201) is located on the inner side of the second air inlet groove (202), and the two ends of the plurality of dynamic pressure generating grooves (203) are respectively connected to the first air inlet groove (201) and the second air inlet groove (202).

5. The shaft assembly according to claim 4, wherein: The radial bearing seat (4) has a ventilation groove (41), and the radial bearing seat (4) has a plurality of air guide holes evenly distributed along the axial direction, and the ventilation groove (41) is connected to the second air guide groove (202).

6. The shaft assembly according to claim 2, wherein: The axial bearing assembly further comprises a diffuser (6), and the axial bearing seat (3) is arranged on the diffuser (6).

7. The shaft assembly according to claim 2, wherein: The rotating shaft (1) is provided with a receiving groove (11) in a stepped structure, the end face of the receiving groove (11) in the radial direction of the rotating shaft (1) is the first end face (101), and the end face of the receiving groove (11) parallel to the axial direction of the rotating shaft (1) is the third end face (102); the axial bearing seat (3) has a fourth end face (302) parallel to the third end face (102), and comb teeth are respectively provided on the third end face (102) and the fourth end face (302).

8. A motor comprising a rotating shaft assembly, characterized in that: The rotating shaft assembly is the rotating shaft assembly according to any one of claims 1 to 7.

9. A compressor comprising a motor, characterized in that: The motor is the motor according to claim 8.

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