CN217539345U

CN217539345U - Auxiliary protection device for magnetic suspension bearing

Info

Publication number: CN217539345U
Application number: CN202122875785.5U
Authority: CN
Inventors: 王思奇; 魏大忠; 田希晖; 毕中炜
Original assignee: Chongqing Gaofu Turbine Technology Co ltd
Current assignee: Chongqing Gaofu Turbine Technology Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-10-04
Anticipated expiration: 2031-11-22

Abstract

An auxiliary protection device for a magnetic suspension bearing. The present application relates to the field of magnetic bearing systems. The protection block assembly comprises a protection block, a fixed block and a fastening piece, wherein the protection block is used for ensuring a protection gap required by starting a magnetic suspension bearing, protecting a motor rotor and a system thereof in a sudden instability state and preventing destructive damage; the fixed block is installed in the rotor groove through a fastener, the protection block is radially and circumferentially positioned through a cylindrical positioning column on the fixed block and the bevel edge of the rotor groove, and is axially positioned through an axial compression ring structure; the magnetic suspension protection device is provided for the magnetic suspension motor, and particularly for the falling protection problem of the disc rotor magnetic suspension motor with compact space and small shaft diameter ratio (shaft length/shaft diameter).

Description

Magnetic suspension bearing auxiliary protection device

Technical Field

The invention provides a rotor protection structure, belongs to the field of magnetic suspension bearing systems, and is used for avoiding damage to the system caused by falling of a rotor when a magnetic suspension bearing fails.

Background

In a magnetic suspension bearing system, in order to ensure the reliability and safety of the system, a set of protection bearings (or called auxiliary bearings, backup bearings and emergency bearings) are generally required. The purpose is to support the rotor when the magnetic suspension bearing is static and prevent the rotor from falling to damage the system when the magnetic suspension bearing fails.

Because the traditional magnetic suspension protection bearing mostly adopts a rolling bearing with standard size, the installation mode and the space are relatively fixed, the materials are mostly metal or ceramic, and lubricating oil or lubricating grease needs to be added. When the shaft diameter of the rotor exceeds the size of a standard bearing and higher requirements are provided for the installation condition and the weight of a protection structure, the traditional protection bearing cannot meet the requirements.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the size limitation of the traditional magnetic suspension motor protective bearing is overcome, and the space occupation amount is reduced, so that the falling protection requirement of the disc rotor type magnetic suspension motor is met, and the safety of a magnetic suspension system is ensured.

The technical scheme adopted by the invention for solving the technical problem is as follows: an auxiliary protection device for a magnetic suspension bearing mainly comprises a protection block, a fixing block and a fastener. The fixed block is installed in the rotor groove through a fastener, the protection block is radially and circumferentially positioned through a cylindrical positioning column and a rotor groove bevel edge on the fixed block, and axial positioning is carried out through the axial compression ring structure.

Due to the adoption of the technical scheme, the invention has the following advantages:

the invention has simple structure, convenient processing and is suitable for various common materials.

2 the invention occupies small space, is not limited by the size of the rotating shaft and can be directly arranged on the rotating shaft.

3 the invention only needs to replace the components with serious wear without replacing all components. And does not need to disassemble other parts during replacement

4 the present invention does not require the provision of any form of lubricating oil.

Drawings

FIG. 1 is an assembly view of a single protective assembly structure;

FIG. 2 is a top view of a single protection block assembly;

FIG. 3 is a cross-sectional view of the protective assembly structure assembled to the rotor

FIG. 4 is a top view of a single mounting block assembly;

FIG. 5 is a top view of the protective member mounted around the entire circumference of the shaft;

in the figure: 1. a protection block; 2. a fixed block; 3. a fastener; 4. a rotor; 41. a rotating shaft groove; 42. Mounting holes; 5. a permanent magnet; 11. positioning the inclined plane; 12. a protection size; 21. a positioning column;

Detailed Description

As shown in fig. 3, the protection blocks are directly installed at both ends of the rotation shaft 4, and the rotor permanent magnet 5 is located between the two protection blocks. The protective blocks are higher than the rotating shaft by a certain size, a plurality of protective blocks are assembled on the whole circumference of the rotating shaft, and the whole system does not need any type of lubrication, as shown in figure 5.

As shown in figures 1 and 2, the protective block has simple shape and low processing difficulty, and is suitable for various metal and non-metal materials. Fig. 4 then shows the structure of fixed block, and the outer fringe is the circular arc, and the arc surface has the via hole, and the plane of one side has cylindrical reference column 21, and various metal materials commonly used can all satisfy its machining precision.

As shown in fig. 1, 2, and 3, the assembled state of the present invention is shown. After the assembly is completed, the fixing block 2 is installed in the groove 41 of the rotation shaft by the fastening member 3. The protection block 1 is radially positioned through a cylindrical positioning column 21 on the fixing block, and the rotation freedom degree is limited through the inclined planes 11 on the two sides. Meanwhile, a small amount of gaps are reserved on the inner side plane of the protection block and the surface corresponding to the rotating shaft groove, so that over-constraint does not exist in the assembly of the protection block, the fixing block and the rotating shaft groove. The axial freedom of the protective assembly may be constrained by an axial structure such as a compression ring or the like (not shown).

And (5) assembling method. And machining a groove with a proper size and a mounting hole (such as a threaded hole) on the rotating shaft, positioning the protection block on the mounting block, and inserting the protection block and the mounting block into the groove of the rotating shaft along the radial direction.

The number of assemblies. The minimum number of fittings is required to ensure that the entire rotor does not touch the rotor in any direction of impact.

And (5) a replacement method. The fastener is taken out firstly, and the protection component can be picked out after the tool extends into the mounting hole; or pry the protection assembly from the chamfer at the rotor groove.

A method for adjusting a guard gap. A spacer may be added between the mounting block and the rotor to adjust the guard gap.

Working process in operation. In the floating stage, the protection assembly can ensure the minimum magnetic gap between the stator and the rotor (namely the protection block is higher than the size 12 of the rotating shaft), so that the stator and the rotor can smoothly float.

After the magnetic bearing is failed, the protective component collides on the stator structure before the rotor magnetic steel, and the bevel edge wedge structures on the two sides of the protective component can provide larger supporting counter force during collision, so that the friction force of the protective block is increased, and the stress and the deformation of the positioning column 21 are reduced. If the protective block is made of non-metal materials, the structural form can provide certain damping.

Claims

1. An auxiliary protection device for a magnetic suspension bearing is characterized in that the protection device comprises a protection block, a fixed block and a fastener; the fixed block passes through the fastener and installs in the rotor recess, the protection piece carries out radial and circumference location through cylinder reference column and rotor recess hypotenuse on the fixed block, carries out axial positioning through axial clamping ring structure.

2. The auxiliary protection device for the magnetic suspension bearing as claimed in claim 1, wherein: the protective blocks are higher than the rotor by a certain size, a plurality of protective blocks are assembled on the whole circumference of the rotor, and the whole device does not need any type of lubrication.

3. A magnetic bearing auxiliary protection device according to claim 1, characterized in that: a small amount of gaps are reserved on the surface, corresponding to the rotor groove, of the inner side plane of the protection block, so that over-constraint does not exist in the assembly of the protection block, the fixing block and the rotor groove.

4. A magnetic bearing auxiliary protection device according to claim 1, characterized in that: a spacer can be added between the mounting block and the rotor to adjust the protective gap.

5. A magnetic bearing auxiliary protection device according to claim 1, characterized in that: the material of the protective block can be selected from metal, ceramic, carbon fiber, plastic and rubber.