Bearing assembly and magnetic suspension system having the same

Abstract

The present application provides a bearing assembly, including a first bearing, a second bearing and an adapter ring; the adapter ring includes a first ring portion, a second ring portion and an annular connecting portion arranged concentrically, the connecting portion includes a first end face and a second end face opposite to each other, the first ring portion is located on the outer peripheral side of the connecting portion and connected to the first end face, the second ring portion is located on the inner peripheral side of the connecting portion and connected to the second end face, the first bearing is sleeved on the inner periphery of the first ring portion, and the second bearing is sleeved on the outer periphery of the second ring portion; the first ring portion and the second ring portion are respectively located on both sides of the connecting portion. According to the bearing assembly of the present application, the limit speed and load-bearing capacity of the emergency bearing can be effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of magnetic suspension technology, and in particular relates to a bearing assembly and a magnetic suspension system having the same. Background Art

[0002] At present, the existing magnetic suspension system includes a front emergency bearing, a front radial magnetic suspension bearing stator, a motor stator, a rotor, a rear radial magnetic suspension bearing stator, a front axial magnetic suspension bearing stator, a rear axial magnetic suspension bearing stator, and a rear emergency bearing. At present, traditional emergency bearings mainly use rolling bearings.

[0003] However, there are several major problems in the prior art: (1) Since the rotor supported by the magnetic bearing often operates at an extremely high speed, which is generally much higher than the maximum speed of the traditional emergency bearing, the retaining frame of the emergency bearing under ultra-high-speed operation will be subjected to a huge impact, and the bearing will generate a large amount of heat, resulting in the fragmentation of the retaining frame and the burning of the bearing; (2) The fall of the high-speed rotating rotor will generate huge vibration and impact, which may directly cause damage to the emergency bearing.

[0004] Therefore, how to provide a bearing assembly and a magnetic suspension system having the same that can effectively improve the maximum speed and load-bearing capacity of the emergency bearing has become an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a bearing assembly and a magnetic suspension system having the same, so as to effectively improve the maximum speed and load-bearing capacity of the emergency bearing.

[0006] In order to solve the above problems, the present application provides a bearing assembly, comprising:

[0007] First bearing;

[0008] Second bearing;

[0009] An adapter ring includes a first ring portion, a second ring portion and an annular connecting portion which are arranged concentrically, the connecting portion includes a first end face and a second end face which are opposite to each other, the first ring portion is located on the outer peripheral side of the connecting portion and is connected to the first end face, the second ring portion is located on the inner peripheral side of the connecting portion and is connected to the second end face, the first bearing sleeve is arranged on the inner periphery of the first ring portion, and the second bearing sleeve is arranged on the outer periphery of the second ring portion; the first ring portion and the second ring portion are respectively located on both sides of the connecting portion.

[0010] Preferably, the inner circumferential wall of the first bearing is located on the inner circumferential side of the inner circumferential wall of the second ring portion.

[0011] Preferably, the first bearing comprises a first outer ring, a first inner ring and a first rolling portion, and the first rolling portion is arranged between the first outer ring and the first inner ring; and / or, the second bearing comprises a second outer ring, a second inner ring and a second rolling portion, and the second rolling portion is arranged between the second outer ring and the second inner ring.

[0012] Preferably, the width of the second ring portion in the axial direction is d1, and the width of the second inner ring is d2; d1≧d2; and the second ring portion covers the inner surface of the second inner ring.

[0013] Preferably, the surface of the connecting portion close to the first bearing includes a first part and a second part; the first part and the second part are arranged in sequence in the direction of the central axis; the first part is in contact with the end surface of the first outer ring, and a first gap exists between the second part and the end surface of the first inner ring and the first rolling portion;

[0014] And / or, the surface of the connecting portion close to the second bearing includes a third part and a fourth part; the third part and the fourth part are arranged in sequence in a direction away from the center axis; the third part is in contact with the end face of the second inner ring, and a second gap exists between the fourth part and the end face of the second outer ring and the second rolling portion.

[0015] Preferably, the first gap is a first groove opened on the second part; and / or, the second gap is a second groove opened on the fourth part.

[0016] Preferably, the first bearings include angular contact bearings or double-row angular contact bearings arranged in pairs; and / or the second bearings include angular contact bearings or double-row angular contact bearings arranged in pairs.

[0017] Preferably, the first bearing is a deep groove ball bearing; and / or the second bearing is a deep groove ball bearing.

[0018] Preferably, the first ring portion and the first bearing have an interference fit or a transition fit; and / or the second ring portion and the second bearing have an interference fit or a transition fit.

[0019] According to another aspect of the present application, a magnetic suspension system is provided, including a bearing assembly, wherein the bearing assembly is the above-mentioned bearing assembly.

[0020] Preferably, the magnetic levitation system also includes a front radial magnetic levitation bearing stator, a motor stator, a rotor, a rear radial magnetic levitation bearing stator, a front axial magnetic levitation bearing stator and a rear axial magnetic levitation bearing stator; the bearing assembly includes a first bearing assembly and a second bearing assembly; the first bearing assembly, the front radial magnetic levitation bearing stator, the motor stator, the rear radial magnetic levitation bearing stator, the front axial magnetic levitation bearing stator and the rear axial magnetic levitation bearing stator and the second bearing assembly are all arranged on the outer peripheral side of the rotor and are arranged in sequence along the axial direction of the rotor.

[0021] Preferably, the rotor comprises a rotating shaft, a front radial magnetic bearing rotor, a motor rotor, a rear radial magnetic bearing rotor and an axial rotor; and a supporting collar is sleeved on the rotating shaft; the first bearing assembly is arranged on the outer peripheral side of the supporting collar; and an annular boss is arranged on the outer surface of the supporting collar; the annular boss is arranged circumferentially of the rotating shaft; the position of the boss and the end of the rotating shaft in the circumferential direction corresponds to each other; the front radial magnetic bearing stator is arranged on the outer peripheral side of the front radial magnetic bearing rotor; the motor stator is arranged on the outer peripheral side of the motor rotor; the rear radial magnetic bearing stator is arranged on the outer peripheral side of the rear radial magnetic bearing rotor; the axial rotor is axially located between the front axial magnetic bearing stator and the rear axial magnetic bearing stator;

[0022] When the radial magnetic bearing is working, a radial working gap b is formed between the front radial magnetic bearing stator and the front radial magnetic bearing rotor, and a radial working gap b is formed between the rear radial magnetic bearing stator and the rear radial magnetic bearing rotor; a radial protection gap a is formed between the inner peripheral wall of the first bearing and the rotating shaft; a radial protection gap c is formed between the second ring portion and the rotating shaft; a<c<b;

[0023] When the axial magnetic bearing is working, a working gap x is formed in the axial direction between the front axial magnetic bearing stator, the axial rotor and the rear axial magnetic bearing stator; an axial protective gap y is formed in the axial direction between the rotating shaft, the first bearing of the first bearing assembly and the supporting ring; y<x.

[0024] The bearing assembly and the magnetic levitation system having the same provided in the present application design the bearing as a double-layer structure, which can effectively improve the emergency bearing's maximum speed and load-bearing capacity, avoid the magnetic levitation bearing rotor speed being higher than the emergency bearing's maximum speed and causing bearing damage, improve the emergency bearing's reliability, and also improve the emergency bearing's load-bearing capacity and impact resistance, improve the emergency bearing's reliability, and the two bearings are arranged axially, which can effectively reduce the radial dimension. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a bearing assembly according to an embodiment of the present application;

[0026] Figure 2 This is a schematic structural diagram of a bearing assembly according to an embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of the structure of the adapter ring in the embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of the structure of the magnetic suspension system of an embodiment of the present application;

[0029] Figure 5 This is a schematic diagram of the structure of a bearing assembly according to an embodiment of the present application;

[0030] Figure 6 This is a schematic structural diagram of a bearing assembly according to an embodiment of the present application.

[0031] The reference numerals are:

[0032] 11. First bearing; 2. Second bearing; 3. Adapter ring; 31. First ring portion; 32. Second ring portion; 33. Connecting portion; 331. First gap; 332. Second gap; 4. Rotor; 41. Rotor shaft; 42. Front radial magnetic bearing rotor; 43. Motor rotor; 44. Rear radial magnetic bearing rotor; 45. Thrust plate; 46. Support collar; 51. Front radial magnetic bearing stator; 52. Rear radial magnetic bearing stator; 61. Front axial magnetic bearing stator; 62. Rear axial magnetic bearing stator. DETAILED DESCRIPTION

[0033] See also Figure 1As shown, according to an embodiment of the present application, a bearing assembly includes: a first bearing 1, a second bearing 2 and an adapter ring; the adapter ring includes a first ring portion 31, a second ring portion 32 and an annular connecting portion 33 which are concentrically arranged, the connecting portion 33 includes a first end face and a second end face which are opposite to each other, the first ring portion 31 is located on the outer peripheral side of the connecting portion 33 and is connected to the first end face, the second ring portion 32 is located on the inner peripheral side of the connecting portion 33 and is connected to the second end face, the first bearing 1 is sleeved on the inner periphery of the first ring portion 31, and the second bearing 2 is sleeved on the outer periphery of the second ring portion 32; the first ring portion 31 and the second ring portion 32 are respectively located on both sides of the connecting portion 33, and the bearing is designed as a double-layer structure, which can effectively improve the emergency bearing limit speed and load-bearing capacity, avoid the magnetic suspension bearing rotor speed being higher than the emergency bearing limit speed and causing bearing damage, improve the emergency bearing reliability, and can also improve the emergency bearing load-bearing capacity and impact resistance, improve the emergency bearing reliability, and the two bearings are axially arranged, which can effectively reduce the radial size. Furthermore, the connecting portion 33 is annular, and the connecting portion 33 is arranged between the first bearing 1 and the second bearing 2, and the outer peripheral side of the connecting portion 33 is connected to the first ring portion 31, and the inner peripheral side of the connecting portion 33 is connected to the second ring portion 32, which can further increase the maximum speed of the emergency bearing and reduce the radial size; at the same time, as a secondary radial protection, it can still play a radial protection role after the inner bearing fails, avoiding the direct malfunction of the magnetic suspension system due to damage to the emergency bearing, thereby improving the service life of the emergency bearing, and adopting a double-layer structure, the rotation speed and impact force can be distributed to the two bearings, which can significantly improve the maximum speed and impact resistance compared to a single bearing; compared with traditional double-layer bearings, standard bearings are assembled using adapter rings to avoid redesigning the bearings and improve versatility; and the middle adapter ring is designed as a step structure, which further increases the maximum speed of the emergency bearing and reduces the radial size; at the same time, the connecting portion 33 can provide secondary radial protection for the magnetic suspension system at the same time, avoiding the direct malfunction of the magnetic suspension system due to damage to the emergency bearing, thereby improving the service life of the emergency bearing.

[0034] Furthermore, the inner circumferential wall of the first bearing 1 is located on the inner circumferential side of the inner circumferential wall of the second ring portion 21 .

[0035] Further, the first bearing 1 comprises a first outer ring, a first inner ring and a first rolling portion, and the first rolling portion is arranged between the first outer ring and the first inner ring; and / or, the second bearing 2 comprises a second outer ring, a second inner ring and a second rolling portion, and the second rolling portion is arranged between the second outer ring and the second inner ring;

[0036] And / or, the second ring portion is located on the outer peripheral side of the inner surface of the first bearing.

[0037] Furthermore, the width of the second ring portion 32 in the axial direction is d1, and the width of the second inner ring is d2; d1≧d2; and the second ring portion 32 covers the inner surface of the second inner ring.

[0038] See also Figure 3 As shown, the present application also discloses some embodiments, the surface of the connecting portion 33 close to the first bearing 1 includes a first part and a second part; the first part and the second part are sequentially arranged in the direction of the central axis; the first part is in contact with the end surface of the first outer ring, and a first gap 331 exists between the second part and the end surface of the first inner ring and the first rolling portion;

[0039] And / or, the surface of the connecting portion 33 close to the second bearing 2 includes a third part and a fourth part; the third part and the fourth part are arranged in sequence in a direction away from the center axis; the third part fits with the end face of the second inner ring, and a second gap 332 exists between the fourth part and the end face of the second outer ring and the second rolling portion.

[0040] Further, the first gap 331 is a first groove opened on the second part; and / or the second gap 332 is a second groove opened on the fourth part.

[0041] See also Figure 2 As shown, the present application also discloses some embodiments, the first bearing 1 includes angular contact bearings or double-row angular contact bearings arranged in pairs; and / or, the second bearing 2 includes angular contact bearings or double-row angular contact bearings arranged in pairs, which can withstand radial and axial loads at the same time and serve as magnetic suspension radial and axial protection bearings.

[0042] Furthermore, the first bearing 1 is a deep groove ball bearing; and / or the second bearing 2 is a deep groove ball bearing, which can not only provide axial protection, but also mainly bear radial loads and a small amount of axial loads, as a magnetic suspension radial protection bearing.

[0043] Further, the first ring portion 31 and the first bearing 1 have an interference fit or a transition fit; and / or the second ring portion 32 and the second bearing 2 have an interference fit or a transition fit.

[0044] See also Figure 4 As shown, according to an embodiment of the present application, a magnetic levitation system includes a bearing assembly, and the bearing assembly is the bearing assembly mentioned above.

[0045] Furthermore, the magnetic suspension system also includes a front radial magnetic suspension bearing stator 51, a motor stator 7, a rotor 4, a rear radial magnetic suspension bearing stator 52, a front axial magnetic suspension bearing stator 61 and a rear axial magnetic suspension bearing stator 62; the bearing assembly includes a first bearing assembly and a second bearing assembly; the first bearing assembly, the front radial magnetic suspension bearing stator 51, the motor stator 7, the rear radial magnetic suspension bearing stator 52, the front axial magnetic suspension bearing stator 61 and the rear axial magnetic suspension bearing stator 62 and the second bearing assembly are all arranged on the outer peripheral side of the rotor 4, and are arranged in sequence along the axial direction of the rotor 4. When the radial magnetic suspension bearing is working, when the magnetic suspension system is working, a radial working gap b is formed between the front radial magnetic suspension bearing stator 42 and the front radial magnetic suspension bearing rotor 42, and a radial working gap b is also formed between the rear radial magnetic suspension bearing stator (5) and the rear radial magnetic suspension bearing rotor 44, providing the magnetic pulling force required for the radial magnetic suspension bearing to work. When a radial protection gap a is formed between the first bearing 1 and the rotor shaft 41 or the support collar 46, a secondary radial protection gap c is formed between the second ring portion 32 and the rotor shaft 41 or the support collar 46, where a<c<b. When the magnetic suspension system fails and causes radial instability of the rotor, the rotor 4 first collides with the first inner ring of the first bearing 1. If the first bearing 1 fails, the rotor 4 collides with the second ring portion 32, and the second bearing 2 plays a protective role, thereby ensuring that the radial magnetic suspension bearing stator and rotor do not collide, playing a role of secondary radial protection. When the axial magnetic suspension bearing is working, the front axial magnetic suspension bearing stator 61, the thrust plate, and the rear axial magnetic suspension bearing stator 62 form an axial magnetic suspension bearing working gap x=x1+x2, providing the magnetic pulling force required for the axial bearing to work. The rotor shaft 41, the support collar 46, and the second bearing assembly form an axial protection gap y=y1+y2 in the axial direction, so that y<x, thereby playing a role of axial protection of the axial magnetic suspension bearing.

[0046] Furthermore, the rotor 4 includes a rotating shaft, a front radial magnetic bearing rotor, a motor rotor, a rear radial magnetic bearing rotor and an axial rotor; and a supporting collar is sleeved on the rotating shaft; the first bearing assembly is arranged on the outer peripheral side of the supporting collar; and an annular boss is arranged on the outer surface of the supporting collar; the annular boss is arranged circumferentially around the rotating shaft; the boss corresponds to the position of the end of the rotating shaft in the circumferential direction; the front radial magnetic bearing stator 51 is arranged on the outer peripheral side of the front radial magnetic bearing rotor; the motor stator 7 is arranged on the outer peripheral side of the motor rotor; the rear radial magnetic bearing stator 52 is arranged on the outer peripheral side of the rear radial magnetic bearing rotor; the axial rotor is axially located between the front axial magnetic bearing stator 61 and the rear axial magnetic bearing stator 62;

[0047] When the radial magnetic bearing is working, a radial working gap b is formed between the front radial magnetic bearing stator 51 and the front radial magnetic bearing rotor, and a radial working gap b is formed between the rear radial magnetic bearing stator 52 and the rear radial magnetic bearing rotor; a radial protection gap a is formed between the inner peripheral wall of the first bearing 1 and the rotating shaft; a radial protection gap c is formed between the second ring portion 32 and the rotating shaft; a<c<b;

[0048] When the axial magnetic bearing is working, a working gap x is formed in the axial direction between the front axial magnetic bearing stator 51, the axial rotor, and the rear axial magnetic bearing stator 52; the rotating shaft, the first bearing in the first component of the first bearing assembly, and the support ring form an axial protective gap y in the axial direction; y<x.

[0049] 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.

[0050] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A bearing assembly, characterized in that: include: A first bearing (1); A second bearing (2); An adapter ring, the adapter ring comprising a first ring portion (31), a second ring portion (32) and an annular connecting portion (33) which are arranged concentrically, the connecting portion (33) comprising a first end face and a second end face which are opposite to each other, the first ring portion (31) being located on the outer circumference side of the connecting portion (33) and connected to the first end face, the second ring portion (32) being located on the inner circumference side of the connecting portion (33) and connected to the second end face, the first bearing (1) being sleeved on the inner circumference of the first ring portion (31), and the second bearing (2) being sleeved on the outer circumference of the second ring portion (32); the first ring portion (31) and the second ring portion (32) being located on both sides of the connecting portion (33) respectively; and the inner circumferential wall of the first bearing (1) being located on the inner circumferential side of the inner circumferential wall of the second ring portion (32); The first bearing (1) comprises a first outer ring, a first inner ring and a first rolling portion, wherein the first rolling portion is arranged between the first outer ring and the first inner ring; and / or the second bearing (2) comprises a second outer ring, a second inner ring and a second rolling portion, wherein the second rolling portion is arranged between the second outer ring and the second inner ring; The surface of the connecting portion (33) close to the first bearing (1) comprises a first part and a second part; the first part and the second part are arranged in sequence in the direction of the central axis; the first part is in contact with the end surface of the first outer ring, and a first gap (331) exists between the second part and the end surface of the first inner ring and the first rolling portion; And / or, the surface of the connecting portion (33) close to the second bearing (2) comprises a third portion and a fourth portion; the third portion and the fourth portion are arranged in sequence in a direction away from the central axis; the third portion is in contact with the end surface of the second inner ring, and a second gap (332) exists between the fourth portion and the end surface of the second outer ring and the second rolling portion; The first bearing (1) is a deep groove ball bearing; and / or the second bearing (2) is a deep groove ball bearing.

2. The bearing assembly according to claim 1, characterized in that: The width of the second ring portion (32) in the axial direction is d1, and the width of the second inner ring is d2; d1≧d2; and the second ring portion (32) covers the inner surface of the second inner ring.

3. The bearing assembly according to claim 1, characterized in that: The first gap (331) is a first groove opened on the second part; and / or the second gap (332) is a second groove opened on the fourth part.

4. The bearing assembly according to claim 1, characterized in that The first bearing (1) comprises angular contact bearings or double-row angular contact bearings arranged in pairs; and / or the second bearing (2) comprises angular contact bearings or double-row angular contact bearings arranged in pairs.

5. The bearing assembly according to claim 1, characterized in that The first ring portion (31) and the first bearing (1) are in an interference fit or a transition fit; and / or the second ring portion (32) and the second bearing (2) are in an interference fit or a transition fit.

6. A magnetic suspension system, comprising a bearing assembly, characterized in that: The bearing assembly is the bearing assembly according to any one of claims 1 to 5.

7. The magnetic levitation system according to claim 6, characterized in that: The magnetic suspension system further comprises a front radial magnetic suspension bearing stator (51), a motor stator (7), a rotor (4), a rear radial magnetic suspension bearing stator (52), a front axial magnetic suspension bearing stator (61), and a rear axial magnetic suspension bearing stator (62); the bearing assembly comprises a first bearing assembly and a second bearing assembly; the first bearing assembly, the front radial magnetic suspension bearing stator (51), the motor stator (7), the rear radial magnetic suspension bearing stator (52), the front axial magnetic suspension bearing stator (61), the rear axial magnetic suspension bearing stator (62), and the second bearing assembly are all arranged on the outer peripheral side of the rotor (4), and are arranged in sequence along the axial direction of the rotor (4).

8. The magnetic levitation system according to claim 7, characterized in that: The rotor (4) comprises a rotating shaft, a front radial magnetic suspension bearing rotor, a motor rotor, a rear radial magnetic suspension bearing rotor and an axial rotor; and a supporting collar is sleeved on the rotating shaft; the first bearing assembly is arranged on the outer peripheral side of the supporting collar; and an annular boss is arranged on the outer surface of the supporting collar; the annular boss is arranged around the rotating shaft in the circumferential direction; the boss corresponds to the position of the end of the rotating shaft in the circumferential direction; the front radial magnetic suspension bearing stator (51) is arranged on the outer peripheral side of the front radial magnetic suspension bearing rotor; the motor stator (7) is arranged on the outer peripheral side of the motor rotor; the rear radial magnetic suspension bearing stator (52) is arranged on the outer peripheral side of the rear radial magnetic suspension bearing rotor; the axial rotor is axially located between the front axial magnetic suspension bearing stator (61) and the rear axial magnetic suspension bearing stator (62); When the radial magnetic bearing is working, a radial working gap b is formed between the front radial magnetic bearing stator (51) and the front radial magnetic bearing rotor, and a radial working gap b is formed between the rear radial magnetic bearing stator (52) and the rear radial magnetic bearing rotor; a radial protective gap a is formed between the first bearing (1) in the second bearing assembly and the rotating shaft; and a radial protective gap c is formed between the second ring portion (32) and the rotating shaft; a<c<b; When the axial magnetic suspension bearing is working, a working gap x is formed in the axial direction among the front axial magnetic suspension bearing stator (61), the axial rotor, and the rear axial magnetic suspension bearing stator (62); and an axial protective gap y is formed in the axial direction among the rotating shaft, the first bearing in the first bearing assembly, and the supporting collar; y<x.

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