CN113700743A - Magnetic suspension bearing protection device, motor, compressor and air conditioner - Google Patents

Abstract

The application provides a magnetic suspension bearing protection device, a motor, a compressor and an air conditioner. This magnetic suspension bearing protection device includes the rotor, the thrust disc, preceding axial iron core, back axial iron core, the bearing frame, protection bearing and axial limit structure, the thrust disc is installed on the rotor, preceding axial iron core and back axial iron core are located the both ends of thrust disc, the bearing frame sets up for back axial iron core is fixed, the inner circle both ends of bearing frame all are provided with axial limit structure, the interior screw-thread fit of axial limit structure and bearing frame, and the outer lane axial position of locking protection bearing, be provided with backstop step and backstop shoulder on the rotor, backstop step and backstop shoulder form the spacing groove, the inner circle of protection bearing is located the spacing inslot. According to the magnetic suspension bearing protection device, when the rotor is unstable in the axial direction, the collision between the thrust disc and the magnetic suspension bearing can be effectively avoided, and the operation reliability of the magnetic suspension bearing is improved.

Description

Magnetic suspension bearing protection device, motor, compressor and air conditioner

Technical Field

The application relates to the technical field of bearings, in particular to a magnetic suspension bearing protection device, a motor, a compressor and an air conditioner.

Background

The related art discloses a method for adjusting the assembly clearance of a magnetic suspension bearing, an auxiliary bearing and a rotor, wherein a compression block is used for applying load to a compressible and deformable spring lamination, and the axial position of a protective bearing in a bearing seat is adjusted, so that the projection position on the rotor is changed, but the rigidity of the spring lamination is smaller, and the impact resistance is poorer; when the rotor is axially unstably collided, the risk exists that the spring lamination fails or is greatly deformed to cause the collision of the thrust disc and the magnetic suspension bearing.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide a magnetic suspension bearing protection device, a motor, a compressor and an air conditioner, so that the collision between a thrust disc and a magnetic suspension bearing can be effectively avoided when the axial instability of a rotor occurs, and the operation reliability of the magnetic suspension bearing is improved.

In order to solve the above problems, the present application provides a magnetic suspension bearing protection device, comprising a rotor, a thrust disc, a front axial iron core, a rear axial iron core, a bearing seat, a protection bearing and an axial limit structure, wherein the thrust disc is installed on the rotor, the front axial iron core and the rear axial iron core are located at two ends of the thrust disc, the bearing seat is fixedly arranged relative to the rear axial iron core, the two ends of an inner ring of the bearing seat are respectively provided with the axial limit structure, the axial limit structure is matched with an internal thread of the bearing seat and locks an outer ring axial position of the protection bearing, the rotor is provided with a stop step and a rear stop shoulder, the stop step and the rear stop shoulder form a limit groove, an inner ring of the protection bearing is located in the limit groove, a gap between the inner ring and the stop step is d1, a gap between the inner ring and the rear stop shoulder is d2, a gap between the thrust disc and the front axial iron core is b1, and a gap between the thrust disc and the rear axial iron core is b2, wherein b1 > d2, b2 > d 1.

Preferably, the axial limit structure comprises a plug screw and an outer ring blocking shoulder, the bearing seat limits the outer ring axial position of the protection bearing through the outer ring blocking shoulders at the two ends, and the plug screw is matched with the internal thread of the bearing seat to lock the axial position of the outer ring blocking shoulder.

Preferably, a radial stator core is further sleeved outside the rotor, a radial gap between the radial stator core and the rotor is a, and a radial gap between the protective bearing and the rotor is c, where a > c.

Preferably, the inner peripheral wall of the bearing seat further comprises a radial positioning section, the radial positioning section is located between the two outer ring retaining shoulders, and the protection bearing is arranged in the radial positioning section.

Preferably, the internal perisporium of bearing frame still includes the counter sink section, forms the step between counter sink section and the radial positioning section, and the internal thread is located the lateral wall of counter sink section, and the counter sink section includes screw thread section and smooth section, plug screw and screw thread section screw-thread fit, and the outer lane keeps off shoulder and smooth section sliding fit.

Preferably, one end of the screw plug, which is far away from the thrust disc, is provided with a moment locking groove.

Preferably, the torque lock groove extends axially through the plug screw.

Preferably, the torque locking groove is located on an inner peripheral wall of the plug screw.

Preferably, the part of the rotor, which is positioned at the axial outer side of the protective bearing, is provided with a positioning step, and the rear retaining shoulder is axially limited on the positioning step.

Preferably, the rotor is provided with external threads, the rear retaining shoulder is provided with internal threads, and the rear retaining shoulder is in threaded fit with the rotor.

Preferably, the rotor is provided with external threads, the axial outer side of the rear retaining shoulder is provided with a locking nut, the locking nut is in threaded fit with the rotor, and the locking nut is locked on the axial outer side of the rear retaining shoulder.

Preferably, the screw plug is in fine thread fit with the bearing seat.

Preferably, the protective bearing is a deep groove ball bearing or an angular contact ball bearing.

Preferably, the protective bearing is a ceramic ball bearing.

According to another aspect of the present application, there is provided an electric machine comprising a magnetic bearing protection device, the magnetic bearing protection device being the magnetic bearing protection device described above.

According to another aspect of the present application, there is provided a compressor comprising a magnetic bearing protection device, wherein the magnetic bearing protection device is the magnetic bearing protection device described above.

According to another aspect of the present application, there is provided an air conditioner comprising a magnetic bearing protection device, wherein the magnetic bearing protection device is the magnetic bearing protection device described above.

The utility model provides a magnetic suspension bearing protection device, including the rotor, the thrust disc, preceding axial iron core, back axial iron core, the bearing frame, protection bearing and axial limit structure, the thrust disc is installed on the rotor, preceding axial iron core and back axial iron core are located the both ends of thrust disc, the bearing frame is fixed to be set up for back axial iron core, the inner circle both ends of bearing frame all are provided with axial limit structure, axial limit structure and the interior screw-thread fit of bearing frame, and lock the outer lane axial position of protection bearing, be provided with backstop step and backstop shoulder on the rotor, backstop step and backstop shoulder form the spacing groove, the inner circle of protection bearing is located the spacing groove, the clearance between inner circle and backstop step is d1, the clearance between inner circle and backstop shoulder is d2, the clearance between thrust disc and preceding axial iron core is b1, the clearance between thrust disc and the back axial iron core is b2, wherein b1 > d2, b2 > d 1. This magnetic suspension bearing protection device will protect the bearing to install in the bearing frame, and adjust the axial mounted position of protection bearing through the screw pair that forms between the axial limit structure at bearing both ends and the bearing frame through setting up, can conveniently realize the regulation of protection bearing axial position, make magnetic suspension bearing protection device's commonality stronger, simplify assembly process, can utilize the axial regulation that the screw pair formed to guarantee protection bearing's shock resistance simultaneously, can be when rotor axial unstability, effectively avoid thrust disc and magnetic suspension bearing collision, improve magnetic suspension bearing operational reliability.

Drawings

FIG. 1 is a schematic structural diagram of a magnetic bearing protection device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a screw plug of a magnetic bearing protection device according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotor; 2. a radial stator core; 3. a front axial core; 4. a rear axial core; 5. a bearing seat; 6. protecting the bearing; 7. a plug screw; 71. a torque locking groove; 8. an outer ring shoulder; 9. locking the nut; 10. a rear shoulder; 11. a thrust disc; 12. a radial positioning section; 13. a stopping step; 14. and positioning the step.

Detailed Description

Referring to fig. 1 to 2 in combination, according to an embodiment of the present application, a magnetic suspension bearing protection device includes a rotor 1, a thrust disc 11, a front axial core 3, a rear axial core 4, a bearing seat 5, a protection bearing 6, and an axial limiting structure, where the thrust disc 11 is mounted on the rotor 1, the front axial core 3 and the rear axial core 4 are located at two ends of the thrust disc 11, the bearing seat 5 is fixedly disposed relative to the rear axial core 4, axial limiting structures are disposed at two ends of an inner ring of the bearing seat 5, the axial limiting structures are matched with an internal thread of the bearing seat 5 and lock an axial position of an outer ring of the protection bearing 6, a stopping step 13 and a rear stopping shoulder 10 are disposed on the rotor 1, the stopping step 13 and the rear stopping shoulder 10 form a limiting groove, an inner ring of the protection bearing 6 is located in the limiting groove, a gap between the inner ring and the stopping step 13 is d1, and a gap between the inner ring and the rear stopping shoulder 10 is d2, the clearance between the thrust disc 11 and the front axial core 3 is b1, and the clearance between the thrust disc 11 and the rear axial core 4 is b2, wherein b1 > d2, and b2 > d 1.

This magnetic suspension bearing protection device will protect bearing 6 to install in bearing frame 5, and adjust the axial mounted position of protection bearing 6 through the screw pair that sets up to form between the axial limit structure at bearing both ends and bearing frame 5, can conveniently realize the regulation of the axial position of protection bearing 6, make magnetic suspension bearing protection device's commonality stronger, simplify assembly process, the axial adjustment that can utilize the screw pair to form simultaneously guarantees protection bearing's shock resistance, can be when rotor axial unstability, effectively avoid thrust disc and magnetic suspension bearing collision, improve magnetic suspension bearing operational reliability.

In this embodiment, because be thread fit relation between axial limit structure and the bearing frame 5, can utilize thread fit to adjust axial limit structure's axial position, consequently can adjust the different axial clearances between backstop step 13 and the back fender shoulder 10 of protection bearing and rotor 1 according to the magnetic suspension bearing and the rotor of difference for the thread fit structure of axial limit structure and bearing frame 5 can be applicable to the protection bearing setting of different grade type, and the suitability is better, and the assembly requirement is simpler.

In this embodiment, when the rotor 1 is unstable, if the rotor 1 moves forward, since the axial gap between the thrust disk 11 and the front axial core 3 is b1, the axial gap between the inner ring and the rear retaining shoulder 10 is d2, and b1 > d2, the rotor 1 drives the rear retaining shoulder 10 to move forward at this time, and the rear retaining shoulder 10 contacts the protection bearing 6 first, so that the thrust disk 11 can be prevented from impacting the front axial core 3, and effective axial protection is formed on the front axial core 3.

Similarly, if rotor 1 moves backward, because the axial clearance between thrust disc 11 and back axial core 4 is b2, the axial clearance between inner circle and backstop step 13 is d1, b2 > d1, therefore rotor 1 can drive backstop step 13 and move backward this moment, backstop step 13 can contact protection bearing 6 earlier, consequently can block thrust disc 11 striking back axial core 4, forms effectual axial protection to back axial core 4.

In one embodiment, (b1+ b2) > (d1+ d2), b1 ═ b2, and d1 ═ d2, the centering performance of the protection bearing 6 can be ensured, and the protection performance of the protection bearing 6 on the magnetic suspension bearing can be improved.

In one embodiment, the rotor 1 is further sleeved with a radial stator core 2, a radial gap between the radial stator core 2 and the rotor 1 is a, and a radial gap between the protective bearing 6 and the rotor 1 is c, where a > c.

In this embodiment, since a > c, when the rotor 1 is unstable and moves in the radial direction, the rotor 1 first contacts the inner ring of the protection bearing 6 and is stopped by the inner ring of the protection bearing 6, so that the rotor 1 does not contact the radial stator core 2, the radial stator core 2 can be effectively protected, and the rotor 1 and the radial stator core 2 are prevented from colliding to damage the radial stator core 2.

The protection bearing 6 of the embodiment can not only carry out axial protection on the magnetic suspension bearing, but also carry out radial protection on the magnetic suspension bearing, so that the radial protection and the axial protection of the magnetic suspension bearing can be integrated, the structure of a magnetic suspension protection system is simplified, accessories are reduced, and the cost is effectively reduced.

The axial limiting structure comprises a plug screw 7 and an outer ring retaining shoulder 8, the bearing seat 5 limits the outer ring axial position of the protective bearing 6 through the outer ring retaining shoulders 8 at two ends, and the plug screw 7 is matched with the inner thread of the bearing seat 5 to lock the axial position of the outer ring retaining shoulder 8. In this embodiment, set up axial limit structure into split type structure, can keep off shoulder 8 through the outer lane and realize and protect the axial cooperation precision between the bearing 6, utilize plug screw 7 to realize the locking to the axial position of protection bearing 6, consequently, the machining precision requirement to plug screw 7 can reduce by a wide margin, the structure complexity of shoulder 8 is kept off to the outer lane has also been reduced simultaneously, it splits apart to have realized carrying out the structure to axial limit structure according to the function, thereby when reducing axial limit structure's whole machining precision requirement, can reduce axial limit structure's the processing degree of difficulty, and the machining efficiency is improved, and the axial positioning precision of protection bearing 6 is guaranteed more easily.

In an embodiment, the axial limiting structure can be set to be an integral structure, that is, the axial positioning and locking functions of the axial limiting structure are integrated, in this embodiment, the plug screw 7 can be omitted, the outer periphery of the outer ring shoulder 8 is provided with an external thread, the external thread of the outer ring shoulder 8 is matched with the internal thread of the bearing seat 5 to realize the axial position locking, and the end face of the outer ring shoulder 8 is matched with the outer ring of the protection bearing 6 to realize the outer ring axial positioning of the protection bearing 6. This kind of structure is compacter, but in order to guarantee the axial fit precision with protection bearing 6, need improve the fit precision of external screw thread and the internal thread of bearing frame 5.

In one embodiment, the inner circumferential wall of the bearing seat 5 further comprises a radial positioning section 12, the radial positioning section 12 is located between the two outer ring shoulders 8, and the protective bearing 6 is arranged in the radial positioning section 12. In the present embodiment, the protection bearing 6 is matched with the radial positioning section 12, and the radial matching precision between the protection bearing 6 and the rotor 1 is ensured by the radial positioning section 12. In this embodiment, the radial positioning section 12 is in clearance fit with the outer ring of the protection bearing 6, preferably in small clearance fit, so that the installation difficulty of the protection bearing 6 can be reduced, and the radial fit precision between the protection bearing 6 and the rotor 1 can be ensured.

In one embodiment, the inner circumferential wall of the bearing seat 5 further comprises a sunken groove section, a step is formed between the sunken groove section and the radial positioning section 12, the internal thread is located on the side wall of the sunken groove section, the sunken groove section comprises a threaded section and a smooth section, the screw plug 7 is in threaded fit with the threaded section, and the outer ring blocking shoulder 8 is in sliding fit with the smooth section. In this embodiment, through setting up the counter sink section, can carry out segmentation design to bearing frame 5 for radial positioning section 12 is in different radial height with including internal screw thread threaded connection section, when not influencing the internal screw thread setting, can guarantee the machining precision of radial positioning section, conveniently carries out radial positioning through radial positioning section and protection bearing 6 cooperation, to protection bearing 6. In a similar way, by arranging the thread section and the smooth section on the sink groove section, the installation and positioning of the screw plug 7 can be conveniently realized through the thread section, and the axial positioning precision of the outer ring blocking shoulder 8 can be effectively ensured through the cooperation of the smooth section and the outer ring blocking shoulder 8.

In one embodiment, the end of the plug screw 7 remote from the thrust disc 11 is provided with a torque lock groove 71. In this embodiment, the torque locking groove 71 can be operated by torque, so that torque can be applied to the screw 7 conveniently in the process of adjusting the axial position of the protective bearing 6, and the adjustment difficulty is reduced. The number of the moment locking grooves 71 is, for example, two, and is arranged symmetrically along the center of the end surface of the plug screw 7.

In one embodiment, the torque locking groove 71 axially penetrates through the plug screw 7, so that the operation end of the torque locking groove 71 is not limited, and the operation of the plug screw 7 is more convenient.

In one embodiment, the moment locking groove 71 is located on the inner peripheral wall of the plug screw 7, so that the influence of the arrangement of the moment locking groove 71 on the structural strength of the plug screw 7 can be reduced while the operation of the plug screw 7 is facilitated.

The rotor 1 is provided with a positioning step 14 at the axial outer side of the protective bearing 6, and the rear retaining shoulder 10 is axially limited on the positioning step 14. In this embodiment, the positioning step 14 is matched with the rear retaining shoulder 10, so that the axial position of the rear retaining shoulder 10 can be accurately positioned, and the axial limiting precision of the rear retaining shoulder 10 on the protection bearing is ensured.

The rotor 1 is provided with external threads, the rear retaining shoulder 10 is provided with internal threads, and the rear retaining shoulder 10 is in threaded fit with the rotor 1. In the embodiment, the rear retaining shoulder 10 not only realizes the axial limiting of the protective bearing 6, but also realizes the axial positioning of the rear retaining shoulder by utilizing a thread structure. In this embodiment, the rotor 1 axially limits the protective bearing 6 and the rear catch 10 by providing a step shaft to form a step.

The rotor 1 is provided with external threads, the axial outer side of the rear retaining shoulder 10 is provided with a locking nut 9, the locking nut 9 is in threaded fit with the rotor 1, and the locking nut 9 is locked on the axial outer side of the rear retaining shoulder 10. In this embodiment, the axial limit precision of the rear retaining shoulder 10 for the protection bearing 6 is realized by the self-processing precision of the rear retaining shoulder 10 and the matching precision of the rotor 1, the processing precision of the lock nut 9 does not need to be considered, and only the axial position of the rear retaining shoulder 10 needs to be locked, so that the processing precision requirement is reduced, the processing cost is lower, and the axial limit precision of the protection bearing 6 is easier to guarantee.

The screw plug 7 is in fine thread fit with the bearing seat 5. In this embodiment, the thread form of the screw pair is preferably a fine-thread triangular thread made of rice, and the thread form has good self-locking performance, so that the self-locking performance between the screw plug 7 and the bearing seat 5 can be effectively improved.

In one embodiment, the protective bearing 6 is a deep groove ball bearing or an angular contact ball bearing, which may be a steel ball bearing or a ceramic ball bearing.

As a preferred embodiment, the protective bearing 6 is a ceramic ball bearing.

During the assembly process of the magnetic suspension bearing protection device, the screw plug 7 and the outer ring shoulder 8 are not locked, so that a certain axial gap is formed between the outer ring shoulder 8 and the protection bearing 6, and the protection bearing 6 can freely slide between the outer ring shoulders 8 at the two ends. And (3) sucking the rotor 1 to the rear end, attaching the thrust disc 11 to the rear axial iron core 4 at the moment, screwing the screw plug 7 forwards to attach the protective bearing 6 to the stop step 13, and screwing the rear end screw plug 7 forwards (b1+ b2-d1-d2)/2, namely, adjusting the axial gap in place. When the rotor 1 suspends, the thrust disc 11 is located between the front axial iron core 3 and the rear axial iron core 4 under the action of the axial magnetic suspension force, the protection bearing 6 is located between the stop step 13 and the rear stop shoulder 10, the bearing seat 5 is disassembled, the screw plugs 7 on two sides of the protection bearing 6 are tightened alternately in a torque increasing mode, then the bearing seat 5 is installed on the rear axial iron core 4 again, and the assembly of the magnetic suspension bearing protection device is completed.

According to an embodiment of the application, the motor comprises a magnetic bearing protection device, and the magnetic bearing protection device is the magnetic bearing protection device.

According to an embodiment of the present application, the compressor includes a magnetic bearing protection device, which is the magnetic bearing protection device described above.

According to an embodiment of the application, the air conditioner comprises a magnetic suspension bearing protection device, and the magnetic suspension bearing protection device is the magnetic suspension bearing protection device.

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 (17)

1. The magnetic suspension bearing protection device is characterized by comprising a rotor (1), a thrust disc (11), a front axial iron core (3), a rear axial iron core (4), a bearing seat (5), a protection bearing (6) and an axial limiting structure, wherein the thrust disc (11) is installed on the rotor (1), the front axial iron core (3) and the rear axial iron core (4) are located at two ends of the thrust disc (11), the bearing seat (5) is fixedly arranged relative to the rear axial iron core (4), the axial limiting structure is arranged at two ends of an inner ring of the bearing seat (5), the axial limiting structure is matched with an inner thread of the bearing seat (5) and locks the axial position of an outer ring of the protection bearing (6), a stopping step (13) and a rear stopping shoulder (10) are arranged on the rotor (1), and the stopping step (13) and the rear stopping shoulder (10) form a limiting groove, the inner ring of protection bearing (6) is located the spacing inslot, the inner ring with the clearance between backstop step (13) is d1, the inner ring with the clearance between backstop shoulder (10) is d2, thrust dish (11) with clearance between preceding axial core (3) is b1, the clearance between thrust dish (11) and back axial core (4) is b2, wherein b1 > d2, b2 > d 1.

2. The magnetic bearing protection device of claim 1, characterized in that the axial limiting structure comprises a screw plug (7) and an outer ring shoulder (8), the bearing seat (5) limits the outer ring axial position of the protection bearing (6) through the outer ring shoulders (8) at two ends, and the screw plug (7) is matched with the internal thread of the bearing seat (5) to lock the axial position of the outer ring shoulder (8).

3. The magnetic bearing protection device according to claim 1, characterized in that a radial stator core (2) is further sleeved outside the rotor (1), a radial gap between the radial stator core (2) and the rotor (1) is a, and a radial gap between the protection bearing (6) and the rotor (1) is c, wherein a > c.

4. Magnetic bearing protection device according to claim 2, characterized in that the inner circumferential wall of the bearing seat (5) further comprises a radial positioning section (12), the radial positioning section (12) being located between the two outer ring shoulders (8), the protection bearing (6) being arranged within the radial positioning section (12).

5. The magnetic bearing protection device according to claim 4, characterized in that the inner peripheral wall of the bearing seat (5) further comprises a sunken groove section, a step is formed between the sunken groove section and the radial positioning section (12), the internal thread is positioned on the side wall of the sunken groove section, the sunken groove section comprises a threaded section and a smooth section, the screw plug (7) is in threaded fit with the threaded section, and the outer ring stop shoulder (8) is in sliding fit with the smooth section.

6. Magnetic bearing protection device according to claim 2, characterized in that the end of the screw plug (7) remote from the thrust disc (11) is provided with a torque locking groove (71).

7. Magnetic bearing protection device according to claim 6, characterized in that the torque locking groove (71) extends axially through the screw plug (7).

8. Magnetic bearing protection device according to claim 7, characterized in that the torque locking groove (71) is located on the inner circumferential wall of the screw plug (7).

9. The magnetic bearing protection device according to claim 1, characterized in that the rotor (1) is provided with a positioning step (14) at the axially outer side of the protection bearing (6), and the backstop shoulder (10) is axially limited on the positioning step (14).

10. Magnetic bearing protection device according to claim 9, characterized in that the rotor (1) is provided with an external thread and the back stop shoulder (10) is provided with an internal thread, the back stop shoulder (10) and the rotor (1) being in threaded engagement.

11. Magnetic bearing protection device according to claim 10, characterized in that the rotor (1) is provided with an external thread, the axially outer side of the rear stop shoulder (10) is provided with a lock nut (9), the lock nut (9) is in threaded engagement with the rotor (1), and the lock nut (9) is locked axially outer side of the rear stop shoulder (10).

12. The magnetic bearing protection device according to claim 2, characterized in that the screw plug (7) and the bearing seat (5) are in fine thread fit.

13. Magnetic bearing protection device according to claim 1, characterized in that the protection bearing (6) is a deep groove ball bearing or an angular contact ball bearing.

14. Magnetic bearing protection device according to claim 13, characterized in that the protection bearing (6) is an angular contact ceramic ball bearing.

15. An electric machine comprising a magnetic bearing protection device, characterized in that the magnetic bearing protection device is a magnetic bearing protection device according to any one of claims 1 to 14.

16. A compressor comprising a magnetic bearing protection device, characterized in that the magnetic bearing protection device is a magnetic bearing protection device according to any one of claims 1 to 14.

17. An air conditioner comprising a magnetic bearing protection device, wherein the magnetic bearing protection device is the magnetic bearing protection device of any one of claims 1 to 14.

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