CN112460146A

CN112460146A - Active magnetic suspension rotor falling protection system

Info

Publication number: CN112460146A
Application number: CN201910840619.6A
Authority: CN
Inventors: 夏冰; 李勇; 姜鹏
Original assignee: Beijing Yzj Environmental Protection Science & Technology Co ltd
Current assignee: Beijing Yzj Environmental Protection Science & Technology Co ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2021-03-09

Abstract

The invention discloses an active magnetic suspension rotor fall protection system which comprises a controller, a distance measuring sensor, an actuating mechanism and a driving device. The radial support of the two shaft ends of the magnetic suspension rotor is realized by the outer ring of the magnetic bearing and the inner ring of the magnetic bearing, and the axial support of the two shaft ends of the magnetic suspension rotor is realized by the axial magnetic bearing. The controller is an independent control unit and can be manufactured by adopting control elements such as a proportional circuit, a microcontroller and the like. The distance measuring sensors are respectively positioned at two ends of the magnetic suspension rotor and used for detecting the space displacement state of the rotor. The actuator can be operated by a driver according to the instruction of the controller to carry out the lifting action of the magnetic suspension rotor. According to the measurement data of the sensor, the protection system can effectively control the displacement fluctuation of the magnetic suspension rotor, and the damage caused by the instability of the rotor is avoided.

Description

Active magnetic suspension rotor falling protection system

Technical Field

The invention belongs to the technical field of magnetic suspension, and particularly provides a magnetic suspension rotor bearing protection system based on active control, which can actively act to eliminate a magnetic suspension rotor bearing working air gap and protect a bearing working gap when detecting that a magnetic suspension rotor bearing is out of control, so that a magnetic suspension rotor is restored to a state supported by a mechanical bearing, and the rotor system is ensured not to run in an eccentric state according to the determined rotation state of an axis, thereby avoiding or reducing fault loss. The system can be used as a passive magnetic suspension rotor protection device in a non-action state.

Background

In a magnetic levitation rotor bearing system, in order to ensure the reliability and safety of the system, a set of protection bearings (also called auxiliary bearings, or backup bearings, or emergency bearings) is generally required, one of which is a radial thrust protection bearing that simultaneously bears a radial load and an axial load, and the main purpose of the protection bearing is to support a rotor rotating at high speed in a radial direction and an axial direction when the magnetic levitation rotor bearing fails, so as to protect magnetic levitation rotor equipment from damage. Because the rotating speed of the magnetic suspension rotor bearing is generally very high, the rotor assembly can generate very large vibration and impact when falling onto the protection bearing, and the main problems existing at present are that the existing protection bearing has poor vibration and impact resistance, the protection bearing is often damaged, and the rotor cannot be well protected. Particularly, in the case of a rotor with high rotating speed and large mass, due to the existence of a protective gap, the rotor deviates from a working axis and continues to rotate after falling down, so that a very large eccentric impact is generated on a mechanical system, the bearing capacity of the system can be far exceeded, and further serious accidents are caused.

In view of this, the present invention is proposed.

Disclosure of Invention

The invention provides an active magnetic suspension rotor protection system for overcoming the defects of the prior art, has a complete monitoring function, can actively lift a rotor, and improves the protection capability of the rotor.

In order to achieve the purpose, the invention adopts the following technical scheme. An active magnetic levitation rotor protection system comprising:

an active magnetic suspension rotor fall protection system is composed of a controller, a distance measuring sensor, an actuating mechanism and a driving device. The radial support of the two shaft ends of the magnetic suspension rotor is realized by the outer ring of the magnetic bearing and the inner ring of the magnetic bearing. The axial support of the two shaft ends of the magnetic suspension rotor is realized by an axial magnetic bearing.

Through the technical scheme, the radial and axial support of the rotor can be realized, and the radial and axial instability of the rotor is effectively protected.

The controller is an independent control unit and can be made of control elements such as a proportional circuit, a microcontroller and the like.

Through the technical scheme, the signals from the distance measuring sensor can be processed to determine whether to adopt active anti-falling action or not, and the action accuracy is improved.

The controller may receive other control signals and perform corresponding actions.

By the technical scheme, the judgment basis can be increased, and the protection reliability is improved.

The distance measuring sensors are respectively positioned at two ends of the magnetic suspension rotor and used for detecting the space displacement state of the rotor.

By the technical scheme, the space displacement of the rotor can be monitored in real time, whether the rotor is unstable or not is judged according to monitoring data, and the rotor is timely and accurately protected.

The distance measuring sensor can be composed of a plurality of sensors and is used for measuring the distance of the rotor deviating from the rotation center.

Through the technical scheme, the control precision can be improved.

The actuator can be operated by a driver according to the instruction of the controller to carry out the lifting action of the magnetic suspension rotor.

Through above-mentioned technical scheme, can in time provide the protection for the rotor, avoid the rotor to damage.

The executing mechanism and the driving device can be composed of a plurality of executing mechanisms and driving devices, and can adopt a mechanical structure driven by hydraulic, pneumatic, electromagnetic and other driving modes to actively eliminate the working clearance of the rotor under the control of a control instruction.

By the technical scheme, the use requirements under different working environments can be met.

The actuating mechanism and the driving device are provided with buffering and rotating structures and can support the rotor to rotate freely.

The invention belongs to an active magnetic suspension rotor drop protection system, the working threshold value can be set according to requirements, and the system is particularly suitable for drop protection of high-inertia and high-rotation-speed rotors and debugging stages of various magnetic suspension rotor systems.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

FIG. 2 is a control flow diagram of the present invention.

Fig. 3 is a schematic structural diagram of an embodiment of the present invention.

The parts in the drawings are numbered as follows: 1. a controller; 21. a ranging sensor; 22. a ranging sensor; 23. a ranging sensor; 24. a ranging sensor; 25. a ranging sensor; 26. a ranging sensor; 31. a drive device; 32. an actuator; 321. a circumferential bearing; 322 a buffer device; 323 a contact element; 324 an axial drive; 33 an actuator; 325 axial bearing; 331. an axial bearing; 332 axial drive means; 333. a circumferential bearing; 334 a contact element; 335. a buffer device; 41. an outer ring of the magnetic bearing; 42. an inner ring of the magnetic bearing; 43. a magnetic suspension rotor; 44. an outer ring of the magnetic bearing; 45. an inner ring of the magnetic bearing; 46. a magnetic bearing; 47. a magnetic bearing;

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Referring to fig. 1-3, an embodiment of the present invention includes:

example 1:

an active magnetic suspension rotor protection system of the present invention is shown in fig. 1, and comprises a controller 1, distance measuring sensors 21-26, an actuator 32 and a driving device 31. Radial support of two axial ends of the horizontal magnetic suspension rotor 43 is realized by the magnetic bearing outer ring 41, the magnetic bearing outer ring 44, the magnetic bearing inner ring 42 and the magnetic bearing inner ring 45. The magnetic levitation rotor 43 is axially supported at both axial ends by

magnetic bearings

46 and 47.

The

distance measuring sensors

21, 22, 23, 24, 25 and 26 are respectively positioned at two ends of the magnetic suspension rotor 43 and are used for detecting the space displacement state of the rotor.

When the controller 1 receives an external control command or detects that one or more detection values of the

distance measuring sensors

21, 22, 23, 24, 25, and 26 are abnormal, the controller 1 triggers the driver 31, the driving actuator 32, and the actuator 33. When the controller 1 does not receive the external control instruction or detects no abnormal detection value, only the monitoring is continued

The actuator 32 is located at one end of the magnetic levitation rotor 43 and is composed of a circumferential bearing 321, a buffer device 322, a contact element 323, an axial driving device 324 and an axial bearing 325, wherein the circumferential bearing 321, the buffer device 322, the contact element 323 and the axial bearing 325 are annular and concentrically arranged, and the contact surface of the contact element 323 and the magnetic levitation rotor 43 is a conical surface, so that the radial and axial freedom degree of one end of the magnetic levitation rotor 43 can be simultaneously restricted by virtue of axial movement. The circumferential bearing 321 and the circumferential bearing 321 may employ a rolling bearing or a sliding bearing; the buffer device 322 can be made of rubber, plastic, metal, etc.; the contact element 323 may be made of a material that is wear resistant, high temperature resistant, and has good shape retention accuracy. The axial driving device 324 can be actuated by the driver 31 according to the command of the controller 1 to push the circumferential bearing 321, the buffer device 322, and the contact element 323 to move along the constrained direction of the axial bearing 325, so as to lift one end of the magnetic suspension rotor 43 and eliminate the eccentricity thereof.

Likewise, the actuator 33 is arranged at the other end of the magnetic levitation rotor 43 and is composed of an axial bearing 331, a damping device 335, a contact element 334, an axial drive 332, and a circumferential bearing 333. The axial driving device 332 can be actuated by the driver 31 according to the command of the controller 1 to push the circumferential bearing 321, the buffer device 322, and the contact element 323 to move along the constrained direction of the axial bearing 325, so as to lift the other end of the magnetic suspension rotor 43 and eliminate the eccentricity thereof.

After the actuating mechanisms 32 and 33 act, the axial and radial displacements of the magnetic suspension rotor 43 are completely restrained, the lifting action is completed, and the magnetic suspension rotor 43 is kept to rotate at the normal rotation center under the support of the

circumferential bearings

321 and 333, so that the damage or the accident is avoided.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An active magnetic suspension rotor fall protection system is composed of a controller, a distance measuring sensor, an actuating mechanism and a driving device. The radial support of the two shaft ends of the magnetic suspension rotor is realized by the outer ring of the magnetic bearing and the inner ring of the magnetic bearing. The axial support of the two shaft ends of the magnetic suspension rotor is realized by an axial magnetic bearing.

2. The controller of claim 1 is a stand-alone control unit that can be made using control elements such as a proportional circuit, microcontroller, and the like.

3. The controller of claim 1, wherein the controller is configured to receive other control signals and perform corresponding actions.

4. Distance measuring sensors according to claim 1 are located at each end of the magnetically levitated rotor for detecting the spatial displacement state of the rotor.

5. A ranging sensor as claimed in claim 1 comprising a plurality of sensors for measuring the distance of the rotor from the centre of rotation.

6. The actuator of claim 1, wherein the actuator is operable by the actuator upon command of the controller to perform the lifting action on the magnetically levitated rotor.

7. The actuator and drive device of claim 1 can be composed of multiple actuators and drive devices, and can be driven by hydraulic, pneumatic, electromagnetic or other drive methods to actively eliminate the rotor working gap under the control of control commands.

8. The actuator and drive of claim 1 having a damping and pivoting structure for supporting the rotor for free rotation.