CN112564380A

CN112564380A - Bearing protection device, magnetic suspension bearing and system thereof

Info

Publication number: CN112564380A
Application number: CN202011359237.0A
Authority: CN
Inventors: 梁豪; 龚高; 李欣; 王建辉; 邓明星
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-03-26
Anticipated expiration: 2040-11-27
Also published as: CN112564380B

Abstract

The application discloses a bearing protection device, a magnetic suspension bearing and a system thereof. The bearing protection device is assembled in the motor shell and sleeved outside the motor rotor, and further comprises a magnetic supporting mechanism and an electromagnetic assembly, wherein the magnetic supporting mechanism is movably assembled between the motor rotor and the motor shell, the electromagnetic assembly is assembled on the motor shell, and the electromagnetic assembly controls the interaction force of the magnetic supporting mechanism on the radial direction to adjust the radial distance of the magnetic supporting mechanism relative to the motor rotor. Compared with the prior art, through the edge between magnetism supporting mechanism and the electromagnetic component in this application the radial interact power of electric motor rotor is adjusted radial distance between electron rotor and the magnetism supporting mechanism, and then overall structure's volume can be simplified, whole reliability is improved, in addition, still can directly conveniently eliminate radial clearance's purpose, can effectively avoid receiving axial interference simultaneously.

Description

Bearing protection device, magnetic suspension bearing and system thereof

Technical Field

The application relates to the technical field of bearing protection equipment, in particular to a bearing protection device, a magnetic suspension bearing and a system thereof.

Background

Magnetic levitation systems usually comprise a magnetic bearing for stably suspending a rotor and a protective bearing for supporting the rotor when the magnetic bearing is not in operation or is unstable, and the protective bearing is often a rolling bearing with high reliability. The magnetic suspension products in the market at present are mainly characterized in that the outer ring of the bearing is fixed on the shell, a certain gap exists between the inner ring and the suspension rotor, no other auxiliary component exists between the rolling bearing and the rotor, and the protection bearing mainly plays a role of supporting the rotor to prevent the rotor from contacting and colliding with the magnetic bearing, thereby protecting the magnetic bearing system. However, when the rotor falls, the bearing is subjected to great impact and vibration of the rotor due to the fact that the gap between the rotor and the rolling bearing cannot be eliminated, the bearing is protected from being damaged, meanwhile, the rotor is damaged to a certain extent, and the service life of the bearing is shortened.

Disclosure of Invention

In order to solve the technical problem of the gap between the rotor and the rolling bearing, the main objective of the present application is to provide a bearing protection device, a magnetic suspension bearing and a system thereof, which can reduce the gap between the rotor and the rolling bearing and prolong the service life of the rolling bearing.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:

according to an aspect of the application, a bearing protection device is provided and assembled in a motor shell, the bearing protection device is sleeved outside a motor rotor, the bearing protection device further comprises a magnetic supporting mechanism and an electromagnetic assembly, the magnetic supporting mechanism is movably assembled between the motor rotor and the motor shell, the electromagnetic assembly is assembled on the motor shell, and the electromagnetic assembly controls the interaction force of the magnetic supporting mechanism in the radial direction to adjust the radial distance of the magnetic supporting mechanism relative to the motor rotor.

According to an embodiment of the present application, the magnetic supporting mechanism includes a first supporting portion and a second supporting portion, and an elastic member is disposed between the first supporting portion and the second supporting portion, and the elastic member pushes outwards between the first supporting portion and the second supporting portion.

According to an embodiment of the present application, the motor further comprises a fixing seat, the fixing seat is assembled on the motor casing, and the fixing seat can limit the axial spacing distance of the magnetic support mechanism relative to the motor rotor.

According to an embodiment of the present application, the fixing base includes a guiding cavity, the guiding cavity includes pushing conical surfaces located at two axial sides, and two axial sides of the magnetic support mechanism have sliding conical surfaces adapted to the pushing conical surfaces.

According to an embodiment of the application, wherein the magnetic support mechanism comprises permanent magnets, the electromagnetic assembly is directly adjustable in radial spacing between the magnetic support mechanism and the motor rotor by a radial force on the permanent magnets.

According to an embodiment of the present application, the first supporting portion and the second supporting portion have an axially concave-convex fitting structure.

According to an embodiment of the application, wherein first supporting part is provided with first joint portion, the second supporting part is provided with second joint portion, first supporting part reaches the second supporting part passes through first joint portion with second joint portion activity joint.

According to an embodiment of the application, the resilient member is a spring-fitted guide rod.

According to an embodiment of the present application, the first support portion and the second support portion further include a mounting hole, the guide rod is slidably fitted in the mounting hole, and the guide rod is axially slidable with respect to the mounting hole.

According to an embodiment of the present application, an accommodating cavity is further provided between the first supporting portion and the second supporting portion, and the elastic member is disposed in the accommodating cavity.

According to an embodiment of the present application, the fixing base includes a first fixing portion and a second fixing portion, and the first fixing portion and the second fixing portion are respectively disposed on two sides of the magnetic supporting mechanism.

According to an embodiment of the application, the magnetic support means is provided with an arc-shaped face facing the motor rotor.

According to an embodiment of the present application, the magnetic supporting mechanism and the electromagnetic assembly are provided with a plurality of sets, and the plurality of sets of the magnetic supporting mechanism and the electromagnetic assembly are distributed along the circumferential direction of the motor rotor at intervals.

According to one aspect of the application, a magnetic suspension bearing is provided, which comprises the bearing protection device.

According to one aspect of the application, a magnetic levitation system is provided, comprising the magnetic levitation bearing described above.

According to the technical scheme, the bearing protection device, the magnetic suspension bearing and the system thereof have the advantages and positive effects that:

through the interaction force between electromagnetic component and the magnetism supporting mechanism, adjust magnetism supporting mechanism with the direct radial distance of rotor, when using, can be direct the magnetism of electromagnetic component and with the interaction force of magnetism supporting mechanism increases or reduces magnetism supporting mechanism with radial spacing distance between the electric motor rotor, simple structure, convenient operation, when electric motor rotor unstability, can control and reduce magnetism support piece is relative radial distance between the electric motor rotor, and then can effectively avoid electric motor rotor and other support component or connecting piece collision, vibrations or fall etc. impact.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic diagram illustrating an overall cross-sectional configuration of a bearing protector according to an exemplary embodiment.

Fig. 2 is a schematic cross-sectional structure diagram illustrating a magnetic support mechanism in a bearing protection device according to an exemplary embodiment.

Fig. 3 is a partial structural view of the entirety of a bearing protection device according to an exemplary embodiment.

Fig. 4 is a schematic view showing an overall structure of a second support portion in a bearing protector according to an exemplary embodiment.

Fig. 5 is a schematic view showing an overall structure of a first support portion in a bearing protector according to an exemplary embodiment.

Fig. 6 is another overall structural view illustrating a second support portion in a bearing protector according to an exemplary embodiment.

Fig. 7 is a schematic view illustrating an overall structure of a fixing seat in a bearing protection device according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. a magnetic support mechanism; 101. a first support section; 102. a second support portion; 103. mounting holes; 104. an accommodating chamber; 105. a sliding conical surface; 106. an arc-shaped surface; 100. a motor housing; 2. an electromagnetic assembly; 200. a motor rotor; 3. an elastic member; 301. a spring; 302. a guide bar; 4. a fixed seat; 401. a guide cavity; 402. pushing against the conical surface; 403. a first fixed part; 404. a second fixed part; 5. a permanent magnet member; 6. a first clamping part; 7. a second clamping part; 8. a gasket; 9. a rolling bearing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The existing magnetic suspension system comprises a magnetic bearing and a protective bearing, wherein the rotor is stably suspended by the magnetic bearing and the protective bearing is mainly used for supporting the rotor when the magnetic bearing does not work, the protective bearing mainly uses a rolling bearing at present, other auxiliary components are not arranged between the rolling bearing and the rotor, certain gaps exist between the protective bearing and the rotor, when the rotor falls, the gaps between the rotor and the rolling bearing cannot be eliminated, large impact and vibration can be generated between the bearing and the rotor, the bearing and the rotor can be damaged by certain damage even if the bearing and the rotor are damaged, and the service life of the rolling bearing is influenced. For there is the clearance among the antifriction bearing and the rotor among the solution prior art, produce great impact and vibrations easily between antifriction bearing and the rotor when the rotor unstability, protection bearings such as antifriction bearing are impaired technical problem easily, this application provides a bearing protection device, assemble in motor casing 100, the bearing protection device cover is located outside motor rotor 200, still includes magnetism supporting mechanism 1 and electromagnetic component 2, magnetism supporting mechanism 1 assemble with activity in motor rotor 200 reaches between the motor casing 100, electromagnetic component 2 assemble in motor casing 100, electromagnetic component 2 through control with magnetism supporting mechanism 1 is at radial ascending interact power, with the adjustment magnetism supporting mechanism 1 is relative motor rotor 200's radial distance.

Referring to fig. 1, which is a schematic cross-sectional view illustrating a bearing protection device according to an exemplary embodiment, it should be noted that a rolling bearing 9 may be further included, the rolling bearing 9 is assembled in the motor housing 100, the magnetic support mechanism 1 is disposed between the rolling bearing 9 and the motor rotor 200, a radial gap between the magnetic support mechanism 1 and the rolling bearing 9 or the motor rotor 200 is adjusted by a radially acting tensile force of an electromagnetic assembly 2 disposed in the motor housing 100 and the magnetic support mechanism 1, when the rotor is not in operation, the electromagnetic assembly 2 and the magnetic support mechanism 1 are magnetically opposite, and the magnetic support mechanism 1 is moved toward the rotor by a repulsive force therebetween, that is, a separation distance between the magnetic support mechanism 1 and the motor rotor 200 is reduced, the magnetic support mechanism 1 can be stably supported between the motor rotor 200 and the rolling bearing 9 or the housing, so that the spacing distance between the magnetic support mechanism 1 and the motor rotor 200 can be timely and rapidly reduced, and the rotor or the rolling bearing 9 is prevented from being damaged.

On the contrary, when the rotor normally works, the electromagnetic assembly 2 can be controlled to carry magnetism opposite to that of the magnetic support mechanism 1, and then attraction force along the radial direction of the motor rotor 200 can be generated between the electromagnetic assembly 2 and the magnetic support mechanism 1, so that the magnetic support mechanism 1 can move towards the direction far away from the motor rotor 200, and further the radial distance between the magnetic support mechanism 1 and the motor rotor 200 can be increased.

And in this application directly utilize electromagnetic component 2 with magnetic support mechanism 1 is at radial ascending interaction force, control electric motor rotor 200 with radial distance between the antifriction bearing 9, the current size of the technical staff accessible adjustment electromagnetic component 2 in the field adjusts the size of electromagnetic repulsion to reach the purpose of adjustment supporting rigidity, can promote the bearing limit of protection bearings such as antifriction bearing 9 greatly, improve the reliability, and control 2 magnetism classification and magnetism size of electromagnetic component, it is not right in this application the control of electromagnetic component 2 does concrete description, can adopt prior art connection control electromagnetic component 2.

The electromagnetic assembly 2 may be positioned and assembled to the motor housing 100 by a spacer 8.

The electromagnetic assembly 2 directly controls the magnetic support mechanism 1 to move in the radial direction, and the structure is simple and reliable; and when the rotor is unstable, the electromagnetic assembly 2 provides repulsive force, so that the magnetic support mechanism 1 is contacted with the rotor and shares part of load, and the bearing limit can be greatly improved.

Referring to fig. 2, a schematic cross-sectional structure of a magnetic support mechanism in a bearing protection device according to an exemplary embodiment is shown, according to an embodiment of the present application, wherein the magnetic support mechanism 1 includes a first support 101 and a second support 102, an elastic member 3 is disposed between the first support 101 and the second support 102, and the elastic member 3 is pushed outward between the first support 101 and the second support 102. It should be understood that, the first supporting portion 101 and the second supporting portion 102 can slide in the axial direction of the motor rotor 200 through the elastic member 3, so as to further achieve stable supporting, and increase adjustment of the magnetic supporting mechanism 1 in the axial direction, so as to stably buffer vibration between the motor rotor 200 and the rolling bearing 9.

Referring to fig. 3 to 6, the elastic member 3 may improve the adhesion force between the first supporting portion 101 and the second supporting portion 102 and the housing, so as to enhance the stability of the fixing between the first supporting portion and the housing, and further enhance the stability of the radial support of the magnetic support mechanism 1.

It should be noted that the elastic member 3 may provide a sufficient elastic supporting force to keep the first supporting portion 101 and the second supporting portion 102 in close contact with the housing in the axial direction at all times, and the elastic member 3 may be compressed to push the first supporting portion 101 and the second supporting portion 102 outwards to make the first supporting portion 101 and the second supporting portion 102 in contact with the motor housing 100 for supporting. One skilled in the art can configure the elastic member 3 as a spring 301, and adjust the maximum elastic relaxation amount and the elastic contraction amount of the spring 301 according to the actual use condition, so that the impact force between the motor rotor 200 and the rolling bearing 9 or the motor housing 100 is smaller than the elastic range of the spring 301.

Preferably, the elastic member 3 may be provided as a guide rod 302 to which the spring 301 is coupled. The spring 301 is assembled between the first supporting portion 101 and the second supporting portion 102 in a compressing manner, the guide rod 302 is sleeved with the spring 301, and the direction of the force applied by the spring 301 to the first supporting portion 101 and the second supporting portion 102 can be controlled by the guide rod 302.

Further, the guide rod 302 is slidably connected to the first support 101 and the second support 102, so that the guide rod 302 is disposed in parallel with the axial direction of the motor rotor 200, and further, the axial resistance of the first support 101 and the second support 102 when the first support 101 and the second support 102 are extended and retracted in the axial direction by the spring 301 can be reduced.

Preferably, the first support portion 101 and the second support portion 102 further include a mounting hole 103, the guide rod 302 is slidably fitted in the mounting hole 103, and the guide rod 302 is axially slidable with respect to the mounting hole 103. It should be noted that the axial depth of the mounting hole 103 and the axial sliding range of the guide rod 302 relative to the mounting hole 103 should be greater than or equal to the axial interval of the first support portion 101 and the second support portion 102 expanded by the spring 301 when the motor rotor 200 does not work, and those skilled in the art can adjust the axial interval according to actual use conditions.

Specifically, when the electromagnetic bearing operates, that is, the motor rotor 200 is suspended and does not physically contact with any support, the first support 101 and the second support 102 should retract, which is satisfied by the electromagnetic assembly 2 sucking and tilting the first support 101 and the second support 102;

when the electromagnetic bearing is not in operation, i.e. the rotor falls down, the first supporting portion 101 and the second supporting portion 102 should slide out to prevent the rotor from colliding, and the elastic member 3 may push the first supporting portion 101 and the second supporting portion 102 outward in the axial direction, i.e. increase the axial interval between the first supporting portion 101 and the second supporting portion 102.

According to an embodiment of the present application, an accommodating cavity 104 is further provided between the first supporting portion 101 and the second supporting portion 102, and the elastic member 3 is disposed in the accommodating cavity 104. Preferably, the cross section of the accommodating cavity 104 may be gradually reduced radially outward, that is, the cross section of the accommodating cavity 104 may be reduced from one end attached to the electronic rotor to the far end, for example, the cross section of the accommodating cavity 104 may be set to be triangular, so as to further improve the stability of the support of the magnetic support mechanism 1 while reducing the mass of the magnetic support mechanism 1.

Referring to fig. 3, a partial structural schematic view of the whole of a bearing protection device according to an exemplary embodiment is shown, and fig. 7 is a partial structural schematic view of the whole of a fixing seat in a bearing protection device according to an exemplary embodiment, which further includes a fixing seat 4 according to an embodiment of the present application, wherein the fixing seat 4 is assembled to the motor housing 100, and the fixing seat 4 can define the axial spacing distance of the magnetic support mechanism 1 relative to the motor rotor 200. Preferably, the fixing base 4 may be sleeved on the motor rotor 200, and the magnetic support mechanism 1 is clamped in the fixing base 4, it should be understood that the magnetic support mechanism 1 is movably assembled to the fixing base 4, and the magnetic support mechanism 1 may slide in a radial direction relative to the fixing base 4, so as to facilitate an interaction force between the electromagnetic assembly 2 and the magnetic support mechanism 1.

According to an embodiment of the present application, wherein the fixing base 4 includes a guiding cavity 401, the magnetic support mechanism 1 can slide in the guiding cavity 401, and then the magnetic support mechanism 1 can rotate coaxially with the motor rotor 200 in the circumferential direction, so as to reduce the circumferential torsion of the magnetic support mechanism 1 when the rotor is unstable, and improve the service life of the magnetic support mechanism 1.

Further, the guiding cavity 401 includes pushing conical surfaces 402 at two axial sides, and the magnetic support mechanism 1 has sliding conical surfaces 105 adapted to the pushing conical surfaces 402 at two axial sides. The pushing conical surface 402 and the sliding conical surface 105 can facilitate the first supporting portion 101 and the second supporting portion 102 to slide out or retract along the guide cavity 401 along the radial direction of the motor rotor 200.

Preferably, the fixing base 4 includes a first fixing portion 403 and a second fixing portion 404, and the first fixing portion 403 and the second fixing portion 404 are respectively disposed on two sides of the magnetic support mechanism 1. The magnetic support mechanism 1 is limited at a certain position in the axial direction of the motor rotor 200 by the first fixing portion 403 and the second fixing portion 404. The guide cavity 401 is sandwiched between the first fixing portion 403 and the second fixing portion 404, and the elastic element 3 can press the first supporting portion 101 and the second supporting portion 102, and the first fixing portion 403 and the second fixing portion 404.

The pushing conical surface 402 is disposed on one side of the first fixing portion 403 and the second fixing portion 404 facing the guide cavity 401, and the sliding conical surface 105 is disposed on one side of the first supporting portion 101 and the second supporting portion 102 facing the fixing base 4, so that the first supporting portion 101 and the second supporting portion 102 can move in the radial direction and the circumferential direction relative to the first fixing portion 403 and the second fixing portion 404.

When the motor rotor 200 does not work, the first supporting portion 101 and the second supporting portion 102 are close to the motor rotor 200, so as to reduce the radial interval between the rolling bearing 9 or the motor housing 100 and the motor rotor 200, and the first fixing portion 403 and the second fixing portion 404 can provide stable support for the first supporting portion 101 and the second supporting portion 102, and further, the motor rotor 200 can stably and slowly fall on the first fixing portion 403 and the second fixing portion 404.

Preferably, the first fixing portion 403 and the second fixing portion 404 are rotatably assembled to the motor housing 100, so that the first fixing portion 403 and the second fixing portion 404 can coaxially rotate with the motor rotor 200, and the torque received between the fixing base 4 and the motor rotor 200 is reduced.

It should be noted that, when the first supporting portion 101 and the second supporting portion 102 slide out, the magnetic supporting mechanism 1 can wrap the rotor, that is, the electromagnetic assembly 2 generates a repulsive force to reduce the radial interval of the magnetic supporting mechanism 1 relative to the motor rotor 200, and when the first supporting portion 101 and the second supporting portion 102 retract, that is, an attractive force is generated between the electromagnetic assembly 2 and the magnetic supporting mechanism 1 to increase the radial interval of the magnetic supporting mechanism 1 relative to the motor rotor 200.

The pushing conical surface 402 and the sliding conical surface 105 are both conical surfaces, so that the first supporting portion 101 and the second supporting portion 102 can move coaxially with the motor rotor 200 in the axial direction while moving in the radial direction, and the resistance of the magnetic supporting assembly during radial movement or circumferential rotation can be effectively reduced.

The elastic element 3 is supported by the sliding conical surface 105, so that the sliding conical surface 105 can move in the circumferential direction or the radial direction and simultaneously fit with the pushing conical surface 402, thereby improving the supporting stability of the first supporting portion 101 and the second supporting portion 102.

According to an embodiment of the present application, wherein the magnetic support mechanism 1 comprises permanent magnets 5, the electromagnetic assembly 2 can directly adjust the radial spacing between the magnetic support mechanism 1 and the motor rotor 200 by a radial force applied to the permanent magnets 5. Preferably, the permanent magnet 5 is disposed facing the electromagnetic assembly 2, and further, in order to reduce the radial space between the permanent magnet 5 and the electromagnetic assembly 2, the permanent magnet 5 may be disposed at an end of the magnetic support mechanism 1 close to the electromagnetic assembly 2, and meanwhile, the magnetic acting force between the magnetic support mechanism 1 and the electromagnetic assembly 2 may be increased, so as to increase the reaction speed of eliminating the radial distance between the rolling bearing 9 and the motor rotor 200 when the rotor is unstable.

It should be noted that a plurality of permanent magnetic members 5 are provided, and a plurality of permanent magnetic members 5 are distributed between the first supporting portion 101 and the second supporting portion 102, and the permanent magnetic members 5 of the first supporting portion 101 can be adsorbed to the permanent magnetic members 5 of the second supporting portion 102, so as to improve the stability of connection and fixation between the first supporting portion 101 and the second supporting portion 102, avoid that the electromagnetic component 2 applies a repulsive force to the permanent magnetic members 5 when the motor rotor 200 is unstable, limit the axial interval between the first supporting portion 101 and the second supporting portion 102, and also improve the supporting force of the first supporting portion 101 and the second supporting portion 102 to the rotor or the rolling bearing 9.

According to an embodiment of the present application, the first supporting portion 101 and the second supporting portion 102 have an axial concave-convex matching structure. The first supporting part 101 and the second supporting part 102 are engaged with each other through an axial concave-convex matching structure, so that the stability of fixation between the first supporting part 101 and the second supporting part 102 is improved, and meanwhile, the axial positioning between the first supporting part and the second supporting part is realized through the concave-convex matching structure.

Preferably, make first supporting part 101 is provided with first joint portion 6, second supporting part 102 is provided with second joint portion 7, first supporting part 101 reaches second supporting part 102 passes through first joint portion 6 with the activity joint of second joint portion 7, first joint portion 6 is continuous sawtooth structure, second joint portion 7 can cooperate first joint portion 6 sets up to intermeshing's sawtooth structure, through first joint portion 6 with the cooperation of second joint portion 7 is injectd first joint portion 6 with second joint portion 7 is at axial spacing distance, further improves the stability of the whole support of magnetism supporting mechanism 1.

According to an embodiment of the present application, the magnetic support mechanism 1 is provided with an arc-shaped surface 106 facing the motor rotor 200. And then the magnetic mechanism can wrap and surround the motor rotor 200, so that the vibration impact between the motor rotor 200 and the rolling bearing 9 or the shell during instability is further reduced.

Preferably, the curved surface of the arc-shaped surface 106 and the curvature of the motor rotor 200 are similar, so that the degree of adhesion between the magnetic support mechanism 1 and the motor rotor 200 is further improved, and the magnetic mechanism is convenient to wrap around the motor rotor 200.

According to an embodiment of the present application, the magnetic supporting mechanism 1 and the electromagnetic assembly 2 are provided with a plurality of sets, and the plurality of sets of the magnetic supporting mechanism 1 and the electromagnetic assembly 2 are distributed along the circumferential direction of the motor rotor 200 at intervals.

Preferably, the magnetic support mechanisms 1 and the electromagnetic assemblies 2 are at least arranged in two groups, so that the two groups of magnetic support mechanisms 1 and the two groups of electromagnetic assemblies 2 are uniformly distributed along the circumference of the motor rotor 200, the magnetic support mechanisms 1 are split circular ring structures with a circular angle of 180 degrees, the inner sides of the circular rings, namely the curvatures of the arc-shaped surfaces 106 are close or the same, and the axial, circumferential and radial movements of the magnetic support mechanisms 1 are further conveniently controlled.

And 4 groups of magnetic supporting components and the electromagnetic components 2 can be arranged, correspondingly, guide cavities 401 corresponding to each group of magnetic supporting components are arranged in the circumferential direction of the fixed seat 4, and further, the circumferential surface of the motor rotor 200 can be better wrapped when the motor rotor 200 does not work.

Integrally, when the magnetic bearing or the click rotor normally works, that is, the click rotor can stably suspend, the electromagnetic assembly 2 is electrified by a signal to generate a magnetic field with a polarity opposite to that of the permanent magnet 5, the first supporting portion 101 and the second supporting portion 102 are attracted to slide outwards along the pushing conical surface 402 in the radial direction, the first supporting portion 101 and the second supporting portion 102 slide relatively close to each other, and the elastic member 3 is pressed.

When the magnetic bearing cannot normally work due to factors such as power failure, overload and the like, namely the motor rotor 200 is in suspension instability, the electromagnetic assembly 2 obtains signals and conducts opposite current, the signals are generated in a magnetic field with the same polarity of the permanent magnetic piece 5 or the electromagnetic assembly 2 is powered off, the first supporting portion 101 and the second supporting portion 102 slide inwards along the radial direction of the pushing conical surface 402 under the action of electromagnetic repulsion and the expansion force of the elastic piece 3, the gap between the rotor and the protection bearing is eliminated, the first supporting portion 101 and the second supporting portion 102 slide away relatively, and the elastic piece 3 is pressed all the time in the whole process.

In the whole expansion and contraction stage, the first supporting portion 101 and the second supporting portion 102 are always located in the guiding cavity 401 of the fixing base 4, and the sliding conical surface 105 is tightly attached to the pushing conical surface 402. After the clearance is eliminated, the rotating motor rotor 200 drives the first supporting part 101 and the second supporting part 102 to rotate circumferentially, then the fixed seat 4 is driven to rotate along with the inner ring of the rolling bearing 9, the electromagnetic assembly 2 generates an annular magnetic field, and the first supporting part 101 and the second supporting part 102 are guaranteed to be under the action of attraction force or repulsion force on the whole circumference.

According to one aspect of the application, a magnetic levitation system is provided, comprising the magnetic levitation bearing described above. It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a bearing protection device, assembles in motor casing (100), outside motor rotor (200) was located to the bearing protection device cover, its characterized in that still includes magnetism supporting mechanism (1) and electromagnetic component (2), magnetism supporting mechanism (1) movably assemble motor rotor (200) and between motor casing (100), electromagnetic component (2) assemble in motor casing (100), electromagnetic component (2) through control with magnetism supporting mechanism (1) is at radial ascending interact power, in order to adjust magnetism supporting mechanism (1) is relative the radial distance of motor rotor (200).

2. The bearing protection device according to claim 1, characterized in that the magnetic support means (1) comprises a first support (101) and a second support (102), an elastic member (3) being arranged between the first support (101) and the second support (102), the elastic member (3) being pushed outwards between the first support (101) and the second support (102).

3. The bearing protection device as claimed in claim 2, further comprising a fixing seat (4), wherein the fixing seat (4) is assembled on the motor casing (100), and the fixing seat (4) can limit the axial spacing distance of the magnetic support mechanism (1) relative to the motor rotor (200).

4. A bearing protection device according to claim 3, wherein the fixing base (4) comprises a guide cavity (401), the guide cavity (401) comprises pushing conical surfaces (402) at two axial sides, and the magnetic support mechanism (1) is provided with sliding conical surfaces (105) adapted to the pushing conical surfaces (402) at two axial sides.

5. Bearing protection device according to claim 1, characterized in that the magnetic support means (1) comprise permanent magnets (5), the electromagnetic assembly (2) being directly adjustable in radial spacing between the magnetic support means (1) and the motor rotor (200) by radial forces on the permanent magnets (5).

6. The bearing protection device as claimed in claim 2, characterized in that the first support (101) and the second support (102) have an axially male-female engagement.

7. The bearing protection device as claimed in claim 6, wherein the first supporting portion (101) is provided with a first clamping portion (6), the second supporting portion (102) is provided with a second clamping portion (7), and the first supporting portion (101) and the second supporting portion (102) are movably clamped with the second clamping portion (7) through the first clamping portion (6).

8. A bearing protection device according to claim 2, characterized in that the elastic member (3) is a guide rod (302) with which a spring (301) engages.

9. The bearing protection device as claimed in claim 8, wherein the first support portion (101) and the second support portion (102) further comprise a mounting hole (103), the guide rod (302) is slidably fitted in the mounting hole (103), and the guide rod (302) is axially slidable with respect to the mounting hole (103).

10. The bearing protection device according to claim 2, characterized in that there is also a housing chamber (104) between the first support (101) and the second support (102), the elastic element (3) being arranged in the housing chamber (104).

11. A bearing protection device according to claim 3, characterized in that the fixing base (4) comprises a first fixing portion (403) and a second fixing portion (404), the first fixing portion (403) and the second fixing portion (404) are respectively disposed at two sides of the magnetic support mechanism (1).

12. Bearing protection device according to claim 1, characterized in that the magnetic support means (1) is provided with an arc-shaped face (106) facing the motor rotor (200).

13. Bearing protection device according to any of claims 1 to 12, characterized in that the magnetic support means (1) and the electromagnetic assemblies (2) are provided in a plurality of groups, the plurality of groups of magnetic support means (1) and electromagnetic assemblies (2) being spaced apart along the circumference of the motor rotor (200).

14. A magnetic bearing comprising a bearing protection device according to any one of claims 1 to 13.

15. A magnetic levitation system comprising the magnetic levitation bearing of claim 14.