Device with a combination of an air bearing and a magnetic force for a thrust bearing

Abstract

The application discloses a device with a thrust bearing combined with air floatation and magnetic force, which comprises a stator part, a rotor part, a first magnetic force assembly and a second magnetic force assembly, the rotor part is rotatably assembled in the stator part, the first magnetic force assembly acts between the stator part and the rotor part and is suitable for generating a first acting force on the rotor part, the second magnetic force assembly acts between the stator part and the rotor part and is suitable for generating a second acting force on the rotor part, the first acting force and the second acting force are suitable for generating a force difference to reset the rotor part when the rotor part is axially displaced relative to the stator part. The device of the embodiment of the application can make the interior of the device have a good correction effect in the axial direction, can effectively solve the friction risk of the air floatation bearing when the device is started or the working condition is changed, has better structural stability, and can improve the service life of the device by improving the service life of the air floatation bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a device with a thrust bearing combined with air floating and magnetic force. BACKGROUND

[0002] Radial air floating bearings are used as support in occasions requiring clean air source, but there are often unbalanced axial forces in devices such as air compressors, and air floating thrust bearings are used in conjunction at this time. In related technologies, when the device starts or stops or the working condition changes, the air floating thrust bearing will deviate, which will cause dry grinding of the air floating thrust bearing and damage the bearing, reducing the service life of the bearing and the device. SUMMARY

[0003] Therefore, the embodiments of the present application provide a device with a thrust bearing combined with air floating and magnetic force, which has good structural stability and long service life.

[0004] The device with a thrust bearing combined with air floating and magnetic force in the embodiments of the present application comprises a stator part, a rotor part, a first magnetic force assembly and a second magnetic force assembly, the rotor part is rotatably assembled in the stator part, the first magnetic force assembly acts between the stator part and the rotor part and is adapted to generate a first acting force on the rotor part, the second magnetic force assembly acts between the stator part and the rotor part and is adapted to generate a second acting force on the rotor part, and the first acting force and the second acting force are adapted to generate a force difference to reset the rotor part when the rotor part axially displaces relative to the stator part.

[0005] The device with a thrust bearing combined with air floating and magnetic force in the embodiments of the present application can make the interior of the device have good correction effect in the axial direction, effectively solve the friction risk of the air floating bearing when the device starts or the working condition changes, have better structural stability, and improve the service life of the air floating bearing and the service life of the device.

[0006] In some embodiments, the first magnetic force assembly comprises a first magnet and a second magnet, one of the first magnet and the second magnet is arranged on the stator part, the other is arranged on the rotor part, and the first acting force is generated between the first magnet and the second magnet, and / or the second magnetic force assembly comprises a third magnet and a fourth magnet, one of the third magnet and the fourth magnet is arranged on the stator part, the other is arranged on the rotor part, and the second acting force is generated between the third magnet and the fourth magnet.

[0007] In some embodiments, the stator portion comprises a first sidewall, the rotor portion comprises a second sidewall, the first sidewall and the second sidewall are oppositely arranged and form a first gap therebetween, one of the first magnet and the second magnet is arranged at the first sidewall, the other one of the first magnet and the second magnet is arranged at the second sidewall, a second gap is formed between the first magnet and the second magnet, the second gap is not less than the first gap, and / or the stator portion comprises a third sidewall, the rotor portion comprises a fourth sidewall, the third sidewall and the fourth sidewall are oppositely arranged and form a third gap therebetween, one of the third magnet and the fourth magnet is arranged at the third sidewall, the other one of the third magnet and the fourth magnet is arranged at the fourth sidewall, a fourth gap is formed between the third magnet and the fourth magnet, the fourth gap is not less than the third gap.

[0008] In some embodiments, the stator portion comprises a first fitting portion and a second fitting portion, the rotor portion comprises a third fitting portion and a fourth fitting portion, the first magnetic force assembly acts between the first fitting portion and the third fitting portion, the second magnetic force assembly acts between the second fitting portion and the fourth fitting portion, or the first fitting portion is provided with an annular groove, the third fitting portion is fitted in the annular groove, the third fitting portion is located between the first magnetic force assembly and the second magnetic force assembly, and the first magnetic force assembly and the second magnetic force assembly are both fitted between the first fitting portion and the third fitting portion.

[0009] In some embodiments, the device is an air compressor, the rotor portion further comprises a shaft body, the third fitting portion and the fourth fitting portion are both fixedly connected with the shaft body, the third fitting portion and the fourth fitting portion are spaced apart along an axial direction of the shaft body, the third fitting portion is a thrust disc, and the fourth fitting portion is an impeller.

[0010] In some embodiments, the rotor portion is provided with an annular region, the annular region is provided with a plurality of flow guide grooves, and the plurality of flow guide grooves are spaced apart along a circumferential direction of the rotor portion.

[0011] In some embodiments, the flow guide grooves are helical grooves.

[0012] In some embodiments, an axial direction of the rotor portion is defined as a first direction, and a projection of the annular region in the first direction surrounds an outer circumferential side of projections of the first magnetic force assembly and the second magnetic force assembly in the first direction.

[0013] In some embodiments, the first magnet, the second magnet, the third magnet and the fourth magnet are all annular.

[0014] In some embodiments, the first magnet, the second magnet, the third magnet and the fourth magnet are integrally formed or are assembled by a plurality of magnetic blocks. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural schematic diagram of an embodiment of the present application.

[0016] Fig. 2 is a structural schematic diagram of an annular region of an embodiment of the present application.

[0017] Fig. 3 is a structural schematic diagram of another embodiment of the present application.

[0018] Reference Signs:

[0019] Stator portion 1; first fitting portion 11; annular groove 111; second fitting portion 12;

[0020] Rotor portion 2; third fitting portion 21; annular region 211; flow guide groove 2111; fourth fitting portion 22; shaft body 23;

[0021] First magnetic force assembly 3; first magnet 31; second magnet 32; second magnetic force assembly 4; third magnet 41; fourth magnet 42; first side wall 501; second side wall 502; third side wall 503; fourth side wall 504. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application, and are intended to explain the present application, and should not be understood as limiting the present application.

[0023] As Figs. 1-3 shown, the device with a thrust bearing combined with air floating and magnetic force of an embodiment of the present application includes a stator portion 1, a rotor portion 2, a first magnetic force assembly 3 and a second magnetic force assembly 4, the rotor portion 2 is rotatably assembled in the stator portion 1, the first magnetic force assembly 3 acts between the stator portion 1 and the rotor portion 2 and is adapted to generate a first acting force on the rotor portion 2, the second magnetic force assembly 4 acts between the stator portion 1 and the rotor portion 2 and is adapted to generate a second acting force on the rotor portion 2, the first acting force and the second acting force are adapted to generate a force difference to reset the rotor portion 2 when the rotor portion 2 is axially displaced relative to the stator portion 1.

[0024] Specifically, the axial direction of the rotor portion 2 can be left-right direction, and the structural cooperation of the rotor portion 2 and the stator portion 1 can constitute an air-floating thrust bearing for bearing axial load during operation of the device, wherein the stator portion 1 is fixedly arranged in position during operation, the first magnetic force assembly 3 can exert a first force on the rotor portion 2 in the left direction, and the second magnetic force assembly 4 can exert a second force on the rotor portion 2 in the right direction, so that the rotor portion 2 can be stably rotated relative to the stator portion 1 when the first force and the second force are in a balanced state.

[0025] When the rotor portion 2 is displaced in the left direction relative to the stator portion 1 during start-up of the device or during a change in working condition of the device, the second force can be greater than the first force at this time, so that the rotor portion 2 can be driven to move to the right and return to the original position, and when the rotor portion 2 is displaced in the right direction relative to the stator portion 1 during start-up of the device or during a change in working condition of the device, the first force can be greater than the second force at this time, so that the rotor portion 2 can be driven to move to the left and return to the original position.

[0026] The device with the air-floating and magnetic force combined thrust bearing according to the embodiments of the present application can have a good deviation correction effect on the rotor portion 2 inside the device by using the first magnetic force assembly 3 and the second magnetic force assembly 4, can effectively solve the friction risk of the air-floating bearing during start-up of the device or during a change in working condition, has better structural stability, and can improve the service life of the air-floating bearing and thus the service life of the device.

[0027] In some embodiments, the first magnetic force assembly 3 includes a first magnet 31 and a second magnet 32, one of the first magnet 31 and the second magnet 32 is arranged on the stator portion 1, and the other is arranged on the rotor portion 2, and the first magnet 31 and the second magnet 32 generate a first force therebetween, and the second magnetic force assembly 4 includes a third magnet 41 and a fourth magnet 42, one of the third magnet 41 and the fourth magnet 42 is arranged on the stator portion 1, and the other is arranged on the rotor portion 2, and the third magnet 41 and the fourth magnet 42 generate a second force therebetween.

[0028] Specifically, as shown in Figs. 1-2 the first magnet 31 can be fixedly mounted on the stator portion 1, the second magnet 32 can be fixedly mounted on the rotor portion 2, the first magnet 31 and the second magnet 32 can be arranged opposite to each other, and repulsion can be generated between the first magnet 31 and the second magnet 32 to exert a first force on the rotor portion 2 in the left direction, the third magnet 41 can be fixedly mounted on the stator portion 1, the fourth magnet 42 can be fixedly mounted on the rotor portion 2, the third magnet 41 and the fourth magnet 42 can be arranged opposite to each other, and repulsion can be generated between the third magnet 41 and the fourth magnet 42 to exert a second force on the rotor portion 2 in the right direction.

[0029] The first magnet 31, the second magnet 32, the third magnet 41 and the fourth magnet 42 can be permanent magnets.

[0030] In some embodiments, the stator part 1 comprises a first side wall 501, the rotor part 2 comprises a second side wall 502, the first side wall 501 and the second side wall 502 are oppositely arranged and a first gap is formed between the first side wall 501 and the second side wall 502, one of the first magnet 31 and the second magnet 32 is arranged on the first side wall 501, and the other is arranged on the second side wall 502, a second gap is formed between the first magnet 31 and the second magnet 32, and the second gap is not less than the first gap.

[0031] Specifically, as shown in the drawings, the first side wall 501 and the second side wall 502 can be vertical planes, a first clamping groove can be formed on the first side wall 501, the first magnet 31 can be fixedly installed in the first clamping groove, a second clamping groove can be formed on the second side wall 502, and the second magnet 32 can be fixedly installed in the second clamping groove, so that the size of the first gap between the first side wall 501 and the second side wall 502 is greater than or equal to the size of the second gap between the first magnet 31 and the second magnet 32, thereby avoiding the phenomenon that the first magnet 31 and the second magnet 32 collide when the rotor part 2 moves right relative to the stator part 1, and the first magnet 31 and the second magnet 32 can be protected. Figs. 1-2 The stator part 1 comprises a third side wall 503, the rotor part 2 comprises a fourth side wall 504, the third side wall 503 and the fourth side wall 504 are oppositely arranged and a third gap is formed between the third side wall 503 and the fourth side wall 504, one of the third magnet 41 and the fourth magnet 42 is arranged on the third side wall 503, and the other is arranged on the fourth side wall 504, a fourth gap is formed between the third magnet 41 and the fourth magnet 42, and the fourth gap is not less than the third gap.

[0032] Specifically, as shown in the drawings, the third side wall 503 and the fourth side wall 504 can be vertical planes, a third clamping groove can be formed on the third side wall 503, the third magnet 41 can be fixedly installed in the third clamping groove, a fourth clamping groove can be formed on the fourth side wall 504, and the fourth magnet 42 can be fixedly installed in the fourth clamping groove, so that the size of the third gap between the third side wall 503 and the fourth side wall 504 is greater than or equal to the size of the fourth gap between the third magnet 41 and the fourth magnet 42, thereby avoiding the phenomenon that the third magnet 41 and the fourth magnet 42 collide when the rotor part 2 moves left relative to the stator part 1, and the third magnet 41 and the fourth magnet 42 can be protected.

[0033] Figs. 1-2

[0034] ​​In some embodiments, the stator portion 1 includes a first mating portion 11 and a second mating portion 12, and the rotor portion 2 includes a third mating portion 21 and a fourth mating portion 22. The first mating portion 11 is provided with an annular groove 111, and the third mating portion 21 is fitted in the annular groove 111. The third mating portion 21 is located between the first magnetic component 3 and the second magnetic component 4. Both the first magnetic component 3 and the second magnetic component 4 are fitted between the first mating portion 11 and the third mating portion 21, or the first magnetic component 3 acts between the first mating portion 11 and the third magnetic component 21, and the second magnetic component 4 acts between the second mating portion 12 and the fourth mating portion 22.

[0035] Specifically, such as Figs. 1-2 As shown, the third mating part 21 can be arranged vertically. The combination of the first mating part 11 and the third mating part 21 can form an air-floating thrust bearing. When the rotor part 2 rotates at high speed relative to the stator part 1, an air film can be formed in the left and right gaps formed between the first mating part 11 and the third mating part 21 to bear the axial load of the rotor part 2 when the equipment is working.

[0036] The device can be an air compressor, which includes a housing. The first mating part 11 and the second mating part 12 can be fixedly installed inside the housing. The rotor part 2 also includes a shaft 23, which can be rotatably fitted inside the housing. The third mating part 21 and the fourth mating part 22 are fixedly connected to the shaft 23. The third mating part 21 and the fourth mating part 22 are distributed at intervals along the axial direction of the shaft 23. The third mating part 21 can be a thrust plate, and the fourth mating part 22 can be an impeller.

[0037] In some embodiments, the two gaps formed between the first mating part 11 and the third mating part 21 can be the third gap and the first gap, respectively. In another embodiment, when the second mating part 12 is located to the left of the fourth mating part 22, the right gap formed between the first mating part 11 and the third mating part 21 can be the first gap, and the gap formed between the second mating part 12 and the fourth mating part 22 can be the third gap.

[0038] The first magnetic component 3 and the second magnetic component 4 can be fixedly installed at the first gap and the third gap, respectively, so as to apply a first force to the left and a second force to the right to the rotor part 2, respectively.

[0039] When rotor part 2 shifts to the right, the first gap decreases and the third gap increases. This increases the repulsive force between the first magnet 31 and the second magnet 32 ​​in the first magnetic assembly 3, making it greater than the repulsive force between the third magnet 41 and the fourth magnet 42 in the second magnetic assembly 4. In other words, the first force is greater than the second force, which can push the third mating part 21 to the left and back to its original position. When rotor part 2 shifts to the left, the third gap decreases and the first gap increases, increasing the repulsive force between the third magnet 41 and the fourth magnet 42 in the second magnetic assembly 4. The second force is greater than the repulsive force between the first magnet 31 and the second magnet 32 ​​in the first magnetic component 3. That is, the second force is greater than the first force, which can push the third mating part 21 to move to the right and return to its original position. Furthermore, the greater the distance that the third mating part 21 shifts to the left or right, the greater the force difference between the first force and the second force will be. This effectively prevents friction damage between the first mating part 11 and the third mating part 21 when the working conditions change during the start-up or operation of the equipment, thereby improving the service life of the air-floating thrust bearing structure and the equipment.

[0040] In some embodiments, the rotor portion 2 is provided with an annular region 211, and the annular region 211 is provided with a plurality of drainage grooves 2111. The plurality of drainage grooves 2111 are arranged at intervals along the circumference of the rotor portion 2, and the drainage grooves 2111 are spiral grooves.

[0041] Specifically, such as Fig. 3 As shown, multiple drainage grooves 2111 are provided on both the left and right sides of the third mating part 21, evenly spaced along the circumference of the third mating part 21. When the third mating part 21 rotates at high speed relative to the first mating part 11, the drainage grooves 2111 facilitate the formation of an air film in the two gaps between the first mating part 11 and the third mating part 21. This air film can be used to bear the axial load during the operation of the device, and the spiral drainage grooves 2111 can improve the stability of the air film.

[0042] In some embodiments, the axial direction of the rotor portion 2 is defined as the first direction, and the projection of the annular region 211 in the first direction surrounds the outer periphery of the projection of the first magnetic component 3 and the second magnetic component 4 in the first direction. Since the first mating portion 11 and the third mating portion 21 constitute an air-bearing thrust bearing, and the bearing capacity and stiffness of the air-bearing thrust bearing are related to the radius of the effective working surface of the bearing, where the effective working surface can be the surface corresponding to the annular region 211, the two gaps formed by the first mating portion 11 and the third mating portion 21 during normal operation of the equipment have the same size and this gap can be defined as h0.

[0043] At this point, the compressibility coefficient of the air-bearing thrust bearing is:

[0044] Taking a pump-in spiral groove air-bearing thrust bearing as an example, its load-bearing capacity and stiffness can be calculated using the following approximate formulas, where:

[0045] Load-bearing capacity:

[0046] stiffness

[0047] In the formula, R2 is the maximum radius of the effective surface of the bearing, and R1 is the minimum radius. It can be seen from the formula that the compressibility, load-bearing capacity, and stiffness of the air-bearing thrust bearing are all related to R2. When R2 is large, the compressibility is large, and the load-bearing capacity and stiffness will also increase. Therefore, in the third mating part 21, by placing the annular area 211 closer to the outer side, the value of R2 can be increased, thereby improving the load-bearing capacity and stiffness of the air-bearing thrust bearing, thus making the equipment more stable and with a longer service life.

[0048] In some embodiments, the first magnet 31, the second magnet 32, the third magnet 41, and the fourth magnet 42 are all annular. Specifically, the annular structure of the first magnet 31, the second magnet 32, the third magnet 41, and the fourth magnet 42 can improve the correction effect on the rotor part 2 and provide better protection. The first magnet 31, the second magnet 32, the third magnet 41, and the fourth magnet 42 can be integrally formed or assembled from multiple magnetic blocks, which facilitates production, processing, and use.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for a thrust bearing combining air flotation and magnetic force, characterized in that, include: Stator section; The rotor portion is rotatably mounted within the stator portion; A first magnetic component and a second magnetic component. The first magnetic component acts between the stator and the rotor and is adapted to generate a first force on the rotor. The second magnetic component acts between the stator and the rotor and is adapted to generate a second force on the rotor. When the rotor changes its operating condition and displaces to the left relative to the stator during equipment startup or operation, the second force is greater than the first force, driving the rotor to move to the right and return to its original position. When the rotor changes its operating condition and displaces to the right relative to the stator during equipment startup or operation, the first force is greater than the second force, driving the rotor to move to the left and return to its original position. The rotor portion includes a third mating part and an annular region. The axial direction of the rotor portion is defined as a first direction. The projection of the annular region in the first direction surrounds the outer periphery of the projections of the first magnetic component and the second magnetic component in the first direction. In the third mating part, the annular region is located closer to the outer side, thereby increasing the maximum radius of the effective bearing surface. The first magnetic component includes a first magnet and a second magnet, one of which is disposed in the stator portion and the other is disposed in the rotor portion, and a first force is generated between the first magnet and the second magnet; And / or, the second magnetic component includes a third magnet and a fourth magnet, one of which is located in the stator portion and the other in the rotor portion, and a second force is generated between the third magnet and the fourth magnet, wherein the first magnet, the second magnet, the third magnet and the fourth magnet are all permanent magnets.

2. The device with a thrust bearing combining air buoyancy and magnetic force according to claim 1, characterized in that, The stator portion includes a first sidewall, and the rotor portion includes a second sidewall. The first sidewall and the second sidewall are arranged opposite to each other and a first gap is formed between them. One of the first magnet and the second magnet is disposed on the first sidewall, and the other is disposed on the second sidewall. A second gap is formed between the first magnet and the second magnet, and the second gap is not smaller than the first gap. And / or, the stator portion includes a third sidewall, the rotor portion includes a fourth sidewall, the third sidewall and the fourth sidewall are arranged opposite to each other and a third gap is formed between them, one of the third magnet and the fourth magnet is disposed on the third sidewall and the other is disposed on the fourth sidewall, a fourth gap is formed between the third magnet and the fourth magnet, and the fourth gap is not smaller than the third gap.

3. The device with a thrust bearing combining air buoyancy and magnetic force according to claim 2, characterized in that, The stator portion includes a first mating portion and a second mating portion, and the rotor portion further includes a fourth mating portion; The first magnetic component acts between the first mating part and the third mating part, and the second magnetic component acts between the second mating part and the fourth mating part; Alternatively, the first mating part is provided with an annular groove, and the third mating part is mated within the annular groove. The third mating part is located between the first magnetic component and the second magnetic component, and both the first magnetic component and the second magnetic component are mated between the first mating part and the third mating part.

4. The device with a thrust bearing combining air buoyancy and magnetic force according to claim 3, characterized in that, The device is an air compressor. The rotor part also includes a shaft. The third mating part and the fourth mating part are both fixedly connected to the shaft. The third mating part and the fourth mating part are distributed at intervals along the axial direction of the shaft. The third mating part is a thrust plate, and the fourth mating part is an impeller.

5. The device with a thrust bearing combining air buoyancy and magnetic force according to claim 1, characterized in that, The annular region is provided with multiple flow channels, which are arranged at intervals along the circumference of the rotor portion.

6. The device with a thrust bearing having a combination of air buoyancy and magnetic force according to claim 5, characterized in that, The drainage channel is a spiral channel.

7. The device with a thrust bearing combining air buoyancy and magnetic force according to claim 1, characterized in that, The first magnet, the second magnet, the third magnet, and the fourth magnet are all ring-shaped.

8. The device with a thrust bearing having a combination of air buoyancy and magnetic force according to claim 7, characterized in that, The first magnet, the second magnet, the third magnet, and the fourth magnet are all integrally formed or are composed of multiple magnetic blocks.

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