CN110805614A - Bearing assembly and magnetic suspension system with same - Google Patents

Bearing assembly and magnetic suspension system with same Download PDF

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Publication number
CN110805614A
CN110805614A CN201911121886.4A CN201911121886A CN110805614A CN 110805614 A CN110805614 A CN 110805614A CN 201911121886 A CN201911121886 A CN 201911121886A CN 110805614 A CN110805614 A CN 110805614A
Authority
CN
China
Prior art keywords
bearing
ring
magnetic suspension
stator
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911121886.4A
Other languages
Chinese (zh)
Inventor
李欣
张小波
张芳
龚高
张超
邓明星
王建辉
吴瑞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201911121886.4A priority Critical patent/CN110805614A/en
Publication of CN110805614A publication Critical patent/CN110805614A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/56—Systems consisting of a plurality of bearings with rolling friction in which the rolling bodies of one bearing differ in diameter from those of another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0459—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0459—Details of the magnetic circuit
    • F16C32/0461—Details of the magnetic circuit of stationary parts of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0459—Details of the magnetic circuit
    • F16C32/0468—Details of the magnetic circuit of moving parts of the magnetic circuit, e.g. of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0474—Active magnetic bearings for rotary movement
    • F16C32/0489—Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing

Abstract

The present application provides a bearing assembly comprising a first bearing, a second bearing, and a adapter ring; the adapter ring comprises a first ring part, a second ring part and an annular connecting part which are arranged concentrically, the connecting part comprises a first end face and a second end face which are opposite to each other, the first ring part is positioned on the outer peripheral side of the connecting part and connected onto the first end face, the second ring part is positioned on the inner peripheral side of the connecting part and connected onto the second end face, the first bearing is sleeved on the inner periphery of the first ring part, and the second bearing is sleeved on the outer periphery of the second ring part; the first ring part and the second ring part are respectively positioned at two sides of the connecting part. According to the bearing assembly, the limit rotating speed and the bearing capacity of the emergency bearing can be effectively improved.

Description

Bearing assembly and magnetic suspension system with same
Technical Field
The application belongs to the technical field of magnetic suspension, and particularly relates to a bearing assembly and a magnetic suspension system with the same.
Background
At present, an existing magnetic suspension system comprises 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, the traditional emergency bearing mainly adopts a rolling bearing.
However, the following problems mainly exist in the prior art: (1) because the rotor supported by the magnetic suspension bearing usually works at a very high rotating speed which is generally far higher than the limit rotating speed of the traditional emergency bearing, the retainer of the emergency bearing working at the super high speed is greatly impacted, and meanwhile, the bearing generates a large amount of heat, so that the retainer is broken and the bearing is burnt; (2) the falling of the rotor rotating at high speed will generate huge vibration and impact, which may directly cause the damage of the emergency bearing.
Therefore, how to provide a bearing assembly capable of effectively improving the ultimate rotation speed and the bearing capacity of the emergency bearing and a magnetic suspension system with the bearing assembly is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a bearing assembly and a magnetic suspension system with the bearing assembly, which effectively improve the limit rotation speed and the bearing capacity of an emergency bearing.
In order to solve the above problems, the present application provides a bearing assembly, comprising:
a first bearing;
a second bearing;
the adapter ring comprises a first ring part, a second ring part and an annular connecting part which are concentrically arranged, the connecting part comprises a first end face and a second end face which are opposite to each other, the first ring part is positioned on the outer peripheral side of the connecting part and connected onto the first end face, the second ring part is positioned on the inner peripheral side of the connecting part and connected onto the second end face, the first bearing is sleeved on the inner periphery of the first ring part, and the second bearing is sleeved on the outer periphery of the second ring part; the first ring part and the second ring part are respectively positioned at two sides of the connecting part.
Preferably, the inner peripheral wall of the first bearing is located on the inner peripheral side of the inner peripheral wall of the second ring portion.
Preferably, the first bearing comprises a first outer ring, a first inner ring and a first rolling part, and the first rolling part is arranged between the first outer ring and the first inner ring; and/or the second bearing comprises a second outer ferrule, a second inner ferrule and a second rolling part, and the second rolling part is arranged between the second outer ferrule and the second inner ferrule.
Preferably, the second ring portion has a width d1 in the axial direction, and the second inner race has a width d 2; d1 ≧ d 2; and the second ring portion covers an inner surface of the second inner race.
Preferably, the surface of the connecting portion adjacent to the first bearing comprises a first portion and a second portion; the first part and the second part are arranged in sequence towards the central shaft direction; the first part is attached to the end face of the first outer ring, and a first gap is formed between the second part and the end face of the first inner ring as well as between the second part and the first rolling part;
and/or the surface of the connecting part close to the second bearing comprises a third part and a fourth part; the third part and the fourth part are sequentially arranged in the direction away from the central shaft; the third part is attached to the end face of the second inner ferrule, and a second gap is formed between the fourth part and the end face of the second outer ferrule and between the fourth part and the second rolling part.
Preferably, the first gap is a first groove opened on the second portion; and/or the second gap is a second groove arranged on the fourth part.
Preferably, the first bearing comprises angular contact bearings or double row angular contact bearings arranged in pairs; and/or the second bearing comprises angular contact bearings arranged in pairs or double row angular contact bearings.
Preferably, the first bearing is a deep groove ball bearing; and/or the second bearing is a deep groove ball bearing.
Preferably, the first ring part is in interference fit or transition fit with the first bearing; and/or the second ring part is in interference fit or transition fit with the second bearing.
According to yet another aspect of the present application, there is provided a magnetic levitation system comprising a bearing assembly as described above.
Preferably, the magnetic suspension system further comprises 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 and a rear axial magnetic suspension bearing stator; the bearing assembly comprises a first bearing assembly and a second bearing assembly; the first bearing assembly, the front radial magnetic suspension bearing stator, the motor stator, the rear radial magnetic suspension bearing stator, the front axial magnetic suspension bearing stator, the rear axial magnetic suspension bearing stator and the second bearing assembly are all arranged on the outer peripheral side of the rotor and are sequentially arranged along the axial direction of the rotor.
Preferably, the rotor 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 the rotating shaft is sleeved with a supporting lantern ring; the first bearing assembly is arranged on the outer peripheral side of the support sleeve ring; and the outer surface of the supporting lantern ring is provided with an annular boss; the annular boss is arranged in the circumferential direction of the rotating shaft; the boss corresponds to the position of the end part of the rotating shaft in the circumferential direction; the front radial magnetic suspension bearing stator is arranged on the outer peripheral side of the front radial magnetic suspension bearing rotor; the motor stator is arranged on the outer peripheral side of the motor rotor; the rear radial magnetic suspension bearing stator is arranged on the outer peripheral side of the rear radial magnetic suspension bearing rotor; the axial rotor is axially positioned between the front axial magnetic suspension bearing stator and the rear axial magnetic suspension bearing stator;
when the radial magnetic suspension bearing works, a radial working gap b is formed between the front radial magnetic suspension bearing stator and the front radial magnetic suspension bearing rotor, and a radial working gap b is formed between the rear radial magnetic suspension bearing stator and the rear radial magnetic suspension 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 part and the rotating shaft; a is more than c and less than b;
when the axial magnetic suspension bearing works, a working gap x is formed among the front axial magnetic suspension bearing stator, the axial rotor and the rear axial magnetic suspension bearing stator in the axial direction; an axial protection gap y is formed among the rotating shaft, the first bearing of the first bearing assembly and the support lantern ring in the axial direction; y is less than x.
The application provides a bearing assembly and have its magnetic suspension system, with the bearing design for bilayer structure, can effectual emergent bearing limit speed and bearing capacity of improvement, avoid magnetic suspension bearing rotor rotational speed to be higher than emergent bearing limit speed and lead to the bearing to damage, improve emergent bearing reliability, can also improve emergent bearing capacity and shock resistance, improve emergent bearing reliability, and two bearing axial are arranged, can effectually reduce radial dimension.
Drawings
FIG. 1 is a schematic structural view of a bearing assembly according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a bearing assembly according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an adapter ring according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a magnetic levitation system according to an embodiment of the present application;
FIG. 5 is a schematic structural view of a bearing assembly according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a bearing assembly according to an embodiment of the present application.
The reference numerals are represented as:
11. a first bearing; 2. a second bearing; 3. a transfer ring; 31. a first ring portion; 32. a second ring portion; 33. a connecting portion; 331. a first gap; 332. a second gap; 4. a rotor; 41. a rotor shaft; 42. a front radial magnetic suspension bearing rotor; 43. a motor rotor; 44. a rear radial magnetic suspension bearing rotor; 45. a thrust disc; 46. a support collar; 51. a front radial magnetic suspension bearing stator; 52. a rear radial magnetic suspension bearing stator; 61. a front axial magnetic suspension bearing stator; 62. and the rear axial magnetic suspension bearing stator.
Detailed Description
Referring collectively to fig. 1, in accordance with an embodiment of the present application, a bearing assembly includes: the bearing comprises a first bearing 1, a second bearing 2 and a transfer ring; the adapter ring comprises a first ring part 31, a second ring part 32 and an annular connecting part 33 which are concentrically arranged, the connecting part 33 comprises a first end face and a second end face which are opposite to each other, the first ring part 31 is positioned on the outer peripheral side of the connecting part 33 and connected to the first end face, the second ring part 32 is positioned on the inner peripheral side of the connecting part 33 and connected to the second end face, the first bearing 1 is sleeved on the inner periphery of the first ring part 31, and the second bearing 2 is sleeved on the outer periphery of the second ring part 32; first ring portion 31 and second ring portion 32 are located the both sides of connecting portion 33 respectively, are bilayer structure with the bearing design, can effectual improvement emergency bearing limit speed and bearing capacity, avoid magnetic suspension bearing rotor rotational speed to be higher than emergency bearing limit speed and lead to the bearing to damage, improve emergency bearing reliability, can also improve emergency bearing capacity and shock resistance, improve emergency bearing reliability, and two bearing axial arrange, can effectually reduce radial dimension. Further, the connecting portion 33 is annular, the connecting portion 33 is disposed between the first bearing 1 and the second bearing 2, 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, and it is possible to further increase the emergency bearing limit rotation speed and reduce the radial dimension; meanwhile, as secondary radial protection, the radial protection function can be still achieved after the inner layer bearing fails, the situation that the magnetic suspension system cannot work normally directly due to damage of the emergency bearing is avoided, the service life of the emergency bearing is prolonged, the rotating speed and the impact force can be distributed into the two bearings by adopting a double-layer structure, and the limit rotating speed and the impact resistance can be obviously improved compared with a single bearing; compared with the traditional double-layer bearing, the standard bearing is assembled by the adapter ring, so that the bearing design is avoided, and the universality is improved; the intermediate adapter ring is designed to be of a step structure, so that the limit rotating speed of the emergency bearing is further improved, and the radial size is reduced; meanwhile, the connecting portion 33 can provide secondary radial protection for the magnetic suspension system, so that the direct and abnormal operation of the magnetic suspension system caused by the damage of the emergency bearing is avoided, and the service life of the emergency bearing is prolonged.
Further, 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.
Further, the first bearing 1 includes a first outer race, a first inner race, and a first rolling portion, and the first rolling portion is disposed between the first outer race and the first inner race; and/or the second bearing 2 comprises a second outer ring, a second inner ring and a second rolling part, and the second rolling part is arranged between the second outer ring and the second inner ring;
and/or the second ring part is positioned on the outer peripheral side of the inner surface of the first bearing.
Further, the second ring portion 32 has a width d1 in the axial direction, and the second inner race has a width d 2; d1 ≧ d 2; and the second ring part 32 covers the inner surface of the second inner collar.
Referring to fig. 3 in combination, the present application also discloses embodiments in which the surface of the connecting portion 33 adjacent to the first bearing 1 comprises a first portion and a second portion; the first part and the second part are arranged in sequence towards the central shaft direction; the first part is attached to the end face of the first outer ring, and a first gap 331 is formed between the second part and the end face of the first inner ring and between the second part and the first rolling part;
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 part and the fourth part are sequentially arranged in the direction away from the central shaft; the third portion is in contact with the end face of the second inner race, and a second gap 332 is provided between the fourth portion and the end face of the second outer race and between the fourth portion and the second rolling portion.
Further, the first gap 331 is a first groove opened on the second portion; and/or the second gap 332 is a second groove opened on the fourth portion.
Referring to fig. 2 in combination, the present application also discloses embodiments where 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, which can simultaneously bear radial and axial loads, while acting as magnetically levitated radial and axial protection bearings.
Further, the first bearing 1 is a deep groove ball bearing; and/or the second bearing 2 is a deep groove ball bearing, not only can provide axial protection, but also can mainly bear radial load and a small amount of axial load and is used as a magnetic suspension radial protection bearing.
Further, the first ring portion 31 is in interference fit or transition fit with the first bearing 1; and/or the second ring portion 32 is an interference or transition fit with the second bearing 2.
Referring collectively to fig. 4, according to an embodiment of the present application, a magnetic levitation system includes a bearing assembly, which is the bearing assembly described above.
Further, 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 periphery of the rotor 4 and are sequentially arranged along the axial direction of the rotor 4, when the radial magnetic suspension bearing works, 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 when the magnetic suspension system works, 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 when the magnetic suspension system works, so that magnetic tension required by the radial magnetic suspension bearing to work is provided. 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 part 32 and the rotor shaft 41 or the support collar 46, wherein a < c < b. When the magnetic suspension system breaks down to cause the radial instability of the rotor, the rotor 4 firstly collides with the first inner ring of the first bearing 1, if the first bearing 1 breaks down, the rotor 4 collides with the second annular part 32, and the second bearing 2 plays a role in protection, so that the stator and the rotor of the radial magnetic suspension bearing are ensured not to collide, and a secondary radial protection effect is played. When the axial magnetic suspension bearing works, a working gap x of the axial magnetic suspension bearing is formed among the front axial magnetic suspension bearing stator 61, the thrust disc and the rear axial magnetic suspension bearing stator 62, wherein the working gap x is x1+ x2, and magnetic tension required by the work of the axial bearing is provided. The rotor shaft 41, the support collar 46 and the second bearing assembly form an axial protection gap y which is y1+ y2, and y is less than x, so that the axial protection function of the axial magnetic suspension bearing is realized.
Further, 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 the rotating shaft is sleeved with a supporting lantern ring; the first bearing assembly is arranged on the outer peripheral side of the support sleeve ring; and the outer surface of the supporting lantern ring is provided with an annular boss; the annular boss is arranged around the circumference of the rotating shaft; the boss corresponds to the end part 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 bearing stator 61 and the rear axial magnetic bearing stator 62;
when the radial magnetic suspension bearing works, a radial working gap b is formed between the front radial magnetic suspension bearing stator 51 and the front radial magnetic suspension bearing rotor, and a radial working gap b is formed between the rear radial magnetic suspension bearing stator 52 and the rear radial magnetic suspension 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 annular part 32 and the rotating shaft; a is more than c and less than b;
when the axial magnetic suspension bearing works, a working gap x is formed among the front axial magnetic suspension bearing stator 51, the axial rotor and the rear axial magnetic suspension bearing stator 52 in the axial direction; the rotating shaft, the first bearing in the first assembly and the support collar in the first bearing assembly form an axial protective gap y in the axial direction; y is less than x.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (12)

1. A bearing assembly, comprising:
a first bearing (1);
a second bearing (2);
the adapter ring comprises a first ring part (31), a second ring part (32) and an annular connecting part (33) which are concentrically arranged, wherein the connecting part (33) comprises a first end surface and a second end surface which are opposite to each other, the first ring part (31) is positioned on the outer peripheral side of the connecting part (33) and connected onto the first end surface, the second ring part (32) is positioned on the inner peripheral side of the connecting part (33) and connected onto the second end surface, the first bearing (1) is sleeved on the inner periphery of the first ring part (31), and the second bearing (2) is sleeved on the outer periphery of the second ring part (32); the first ring part (31) and the second ring part (32) are respectively positioned at two sides of the connecting part (33).
2. A bearing assembly according to claim 1, characterized in that 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 part (21).
3. A bearing assembly according to claim 2, characterized in that the first bearing (1) comprises a first outer ring, a first inner ring and a first rolling portion 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 part, wherein the second rolling part is arranged between the second outer ring and the second inner ring.
4. A bearing assembly according to claim 3, characterized in that the second ring portion (32) has a width d1 in the axial direction, the second inner ring having a width d 2; d1 ≧ d 2; and the second ring part (32) covers the inner surface of the second inner collar.
5. A bearing assembly according to claim 3, characterized in that the surface of the connecting portion (33) close to the first bearing (1) comprises a first portion and a second portion; the first part and the second part are arranged in sequence towards the central shaft direction; the first part is attached to the end face of the first outer ring, and a first gap (331) is formed between the second part and the end face of the first inner ring and between the second part and the first rolling part;
and/or the surface of the connecting part (33) close to the second bearing (2) comprises a third part and a fourth part; the third part and the fourth part are sequentially arranged in the direction away from the central shaft; the third portion is attached to the end surface of the second inner race, and a second gap (332) is formed between the fourth portion and the end surface of the second outer race and between the fourth portion and the second rolling portion.
6. A bearing assembly according to claim 5, characterized in that the first gap (331) is a first groove opening onto the second portion; and/or the second gap (332) is a second groove opened on the fourth portion.
7. 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.
8. Bearing assembly according to claim 1, characterized in that the first bearing (1) is a deep groove ball bearing; and/or the second bearing (2) is a deep groove ball bearing.
9. Bearing assembly according to claim 1, wherein the first ring portion (31) is an interference or transition fit with the first bearing (1); and/or the second ring part (32) is in interference fit or transition fit with the second bearing (2).
10. A magnetic levitation system comprising a bearing assembly, wherein the bearing assembly is a bearing assembly as claimed in any one of claims 1 to 9.
11. Magnetic levitation system according to claim 10, further comprising a front radial magnetic bearing stator (51), a motor stator (7), a rotor (4), a rear radial magnetic bearing stator (52), a front axial magnetic bearing stator (61) and a rear axial magnetic 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 sequentially arranged along the axial direction of the rotor (4).
12. Magnetic levitation system according to claim 11, wherein the rotor (4) comprises a rotating shaft, a front radial magnetic levitation bearing rotor, a motor rotor, a rear radial magnetic levitation bearing rotor and an axial rotor; the rotating shaft is sleeved with a supporting lantern ring; the first bearing assembly is arranged on the outer peripheral side of the support collar; an annular boss is arranged on the outer surface of the supporting lantern ring; the annular boss is arranged around the rotating shaft in the circumferential direction; the boss corresponds to the end part 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 bearing stator (61) and the rear axial magnetic bearing stator (62);
when the radial magnetic suspension bearing works, a radial working gap b is formed between the front radial magnetic suspension bearing stator (51) and the front radial magnetic suspension bearing rotor, and a radial working gap b is formed between the rear radial magnetic suspension bearing stator (52) and the rear radial magnetic suspension bearing rotor; a radial protection gap a is formed between the first bearing (1) and the rotating shaft; a radial protection gap c is formed between the second ring part (32) and the rotating shaft; a is more than c and less than b;
when the axial magnetic suspension bearing works, a working gap x is formed among the front axial magnetic suspension bearing stator (51), the axial rotor and the rear axial magnetic suspension bearing stator (52) in the axial direction; an axial protective gap y is formed among the rotating shaft, a first bearing in the first bearing assembly and the support collar in the axial direction; y is less than x.
CN201911121886.4A 2019-11-15 2019-11-15 Bearing assembly and magnetic suspension system with same Pending CN110805614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911121886.4A CN110805614A (en) 2019-11-15 2019-11-15 Bearing assembly and magnetic suspension system with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911121886.4A CN110805614A (en) 2019-11-15 2019-11-15 Bearing assembly and magnetic suspension system with same

Publications (1)

Publication Number Publication Date
CN110805614A true CN110805614A (en) 2020-02-18

Family

ID=69490104

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911121886.4A Pending CN110805614A (en) 2019-11-15 2019-11-15 Bearing assembly and magnetic suspension system with same

Country Status (1)

Country Link
CN (1) CN110805614A (en)

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