Hybrid suspension bearing mechanism
By combining air suspension and magnetic levitation technology, the axial constraint is achieved using permanent magnet repulsion force, which solves the problems of high manufacturing cost and complex structure of existing air suspension bearings, achieves wider and higher-end applications, and improves the stability of the system and cost-effective.
Patent Information
- Application Number
- CN202310920736.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-26
- Publication Date
- 2025-02-11
AI Technical Summary
The high manufacturing cost, complex structure and high machining accuracy requirements of existing air-suspended bearings limit their wider and higher-end applications.
A hybrid suspension bearing mechanism combining air suspension and magnetic suspension is adopted to achieve axial stable constraints through the repulsive force between permanent magnets, and a radial restraint is provided by using air suspension bearings to achieve contactless suspension operation of the rotor.
The system structure is simplified, the parts processing accuracy requirements are reduced, the product cost is reduced, and the bearing system is improved, and the application range of air-suspended bearings is expanded.
Smart Images
Figure CN119412435A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of mechanical rotation, and in particular relates to a hybrid suspension bearing mechanism. Background Art
[0002] Air suspension technology has a wide range of applications, including in aerospace, electric power industry, heavy machinery, semiconductors, optical manufacturing and other industries. Specific products include plane motion air bearings, air-floating turntables, air-floating spindles, air-floating guides, rotating air-floating bearings, air-floating cushions, air feet, etc. Among them, the air-floating bearing that supports the suspension and rotation of the shaft is already a mature structural form. It consists of two sets of radial and axial air-floating bearing assemblies to form a complete set of air-floating bearing systems with full freedom constraints. However, at present, the manufacturing cost of air-floating bearings is high, the structure of the bearing system is complex, and the processing accuracy requirements are very high. Summary of the invention
[0003] The present invention aims to overcome the limitations of the above-mentioned air suspension bearings, so as to achieve wider or more advanced applications of the suspension bearings.
[0004] The present invention provides a hybrid suspension bearing mechanism combining air suspension and magnetic suspension, wherein the repulsive force between permanent magnets realizes stable axial constraint of the rotor; when the rotor is running, the air suspension bearing provides radial constraint force, and the magnetic suspension bearing provides axial constraint force, so that the running trajectory of the rotor is constrained within the range of radial air suspension gap and axial magnetic suspension gap, thereby realizing contactless suspension operation of the rotor assembly of the rotating machinery.
[0005] The hybrid suspension bearing mechanism comprises an air suspension bearing and a magnetic suspension bearing, which are installed together in a casing; after the several parts of the hybrid suspension bearing mechanism are fully assembled, there will be a coaxial hole for installing the shaft core of a suspension rotor system; wherein, the air suspension bearing is used to provide radial constraint force for the rotor system, and the magnetic suspension bearing is used to provide axial constraint force for the rotor system, and the air suspension bearing and the magnetic suspension bearing together ensure the contactless rotation operation of the rotor system.
[0006] Further technical solution: The magnetic bearing comprises a set of three parallel coaxial magnetic rings; the middle magnetic ring is a dynamic magnetic ring fixedly mounted on the shaft end and rotating with the shaft core; there is a static magnetic ring on each axial side of the dynamic magnetic ring that does not rotate with the shaft core; one of the static magnetic rings N Located inside the shaft end, another static magnetic ring WLocated outside the shaft end; the two static magnetic rings are fixed together on the same magnetic ring housing assembly to form a static magnetic ring assembly; when the three magnetic rings are magnetized, it is ensured that the two adjacent magnetic rings are in opposite axial magnetic directions to form an axial repulsive force to provide a restraining force that does not contact the static magnetic ring assembly in the axial direction when the rotor system rotates; a gap is provided in the radial direction between the dynamic magnetic ring and the magnetic ring housing assembly.
[0007] An optimized technical solution: the three magnetic rings have the same appearance and can be replaced with each other before magnetization.
[0008] Optional technical solution: static magnetic ring outside the shaft end W There is no inner hole, that is, it is a complete round magnet.
[0009] Optimized technical solution: The magnetic ring shell assembly is made of magnetic conductive material.
[0010] Optional technical solution: There is a magnetic bearing at each end of the shaft core.
[0011] Optional technical solution: There are several air suspension bearings on a shaft core.
[0012] Optional technical solution: The magnetic ring housing assembly includes a magnetic ring housing and a magnetic ring housing cover.
[0013] In a series of technical solutions of the above-mentioned hybrid suspension bearing mechanism, the dynamic magnetic ring is fixedly connected to the shaft and clamped between the two static magnetic rings. The two adjacent magnetic rings are axially magnetized and have opposite magnetic directions, repelling each other. The size of the gap between the dynamic and static magnetic rings, the size of the magnetic rings and the magnetic flux density in the gap jointly determine the rigidity of the axial constraint. During the design, the size of the magnetic gap, the size of the magnetic rings and the residual magnetic parameters of the permanent magnetic material are adjusted to meet the range of allowable movement of the shaft system and the maximum bearing capacity of the axial support; the radial air bearing constrains the radial eccentricity of the dynamic and static magnetic rings within a smaller range and provides sufficient radial support force, which can limit the radial repulsion caused by the eccentricity of the dynamic and static magnetic rings, and prevent the rotor from becoming unstable and overturning; the end faces of the two static magnetic rings that are not facing the dynamic magnetic ring are connected to the shell made of magnetic conductive material to form a magnetic field path, so that the three magnetic rings form a closed magnetic circuit structure, which can enhance the magnetic flux density of the gap between the dynamic and static magnetic rings, and then improve the rigidity and maximum bearing capacity of the axial support.
[0014] In the technical solution actually implemented, a hybrid suspension rotor system driven by a motor uses the hybrid suspension bearing described in any of the above claims during operation; wherein the rotor of the motor is fixedly connected to the shaft core to form a rotor system. An optional technical solution is: in the hybrid suspension rotor system driven by the motor, the rotor of the motor is located between the bearings on the shaft core, and each end of the motor has a magnetic suspension bearing, and there are several air suspension bearings in the middle.
[0015] Technical effect: The present invention uses a permanent magnet component structure to achieve axial suspension, and forms a hybrid suspension bearing system with full-degree-of-freedom constraints with a radial air suspension component. In certain applications, the system structure can be simplified, the machining accuracy of parts can be partially reduced, and product costs can be reduced. The use of multiple bearings can also improve the stability and support stiffness of the bearing system, overcoming the limitations of simple air suspension bearings and making the application of air suspension bearings more extensive and high-end. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The column diagram used in the present invention is described as follows: Figure 1 Schematic diagram of the structure of a hybrid suspension bearing Figure 2 Schematic diagram of a motor-driven suspended rotor system Among them, 1 air suspension bearing; 2 magnetic suspension bearing; 3 housing; 4 suspension rotor system; 5 shaft core; 6 dynamic magnetic ring; 7 static magnetic ring N ; 8 static magnetic ring W ; 9 Magnetic ring housing assembly; 10 Static magnetic ring assembly; 11 Magnetic ring housing cover; 12 Magnetic ring housing; 13 Motor rotor; 14 Motor stator Specific embodiments
[0017] Embodiment 1: A hybrid suspension bearing mechanism, such as Figure 1 As shown, it includes an air suspension bearing 1 and a magnetic suspension bearing 2, which are installed together in a casing 3; the several parts of the hybrid suspension bearing mechanism have a coaxial hole after being fully assembled, which is used to install a shaft core 5 of a suspended rotor system 4; wherein, the air suspension bearing 1 is used to provide radial constraint force for the rotor system 4, and the magnetic suspension bearing 2 is used to provide axial constraint force for the rotor system 4, and the air suspension bearing 1 and the magnetic suspension bearing 2 together ensure the contactless rotation operation of the rotor system 4; the magnetic suspension bearing 2 includes a group of three parallel coaxial magnetic rings; the middle magnetic ring is a dynamic magnetic ring 6 fixedly installed on the shaft end and rotates with the shaft core 5; the axial sides of the dynamic magnetic ring 6 are each provided with a static magnetic ring that does not rotate with the shaft core; one of the static magnetic rings N 7 is located inside the shaft end, another static magnetic ring W 8 is located outside the shaft end; the two static magnetic rings are fixed together on the same magnetic ring housing assembly 9 to form a static magnetic ring assembly 10; when the magnetic rings are magnetized, it is ensured that the two adjacent magnetic rings have opposite axial magnetic directions to form an axial repulsive force to provide the rotor system with no axial contact with the static magnetic ring assembly when rotating; a radial gap is provided between the dynamic magnetic ring 6 and the magnetic ring housing assembly 9 so that the dynamic magnetic ring 6 will not contact the magnetic ring housing assembly 9 during the rotational movement.
[0018] In this embodiment, the three magnetic rings have the same appearance and can be replaced with each other before magnetization, and the magnetic ring housing assembly 9 is made of magnetic conductive material; the magnetic ring housing assembly 9 includes a magnetic ring housing 12 and a magnetic ring housing cover 11.
[0019] This embodiment 2 is one of the specific applications of embodiment 1, that is, the shaft core 5 is fixed to the rotor 13 of the motor, and together with the moving magnetic ring, forms a rotor system 4, such as Figure 2 As shown, the motor stator 14 and the rotor system where the motor rotor 13 is located are contactless.
[0020] In practice, there can be more flexible applications, for example, there is a magnetic bearing at each end of the shaft core; there are several air bearings on one shaft core, etc. These specific extended application embodiments can increase the supporting force of the hybrid suspension bearing and make the rotor system more rigid.
[0021] The technical effect of the above-mentioned embodiment of the present invention is that a permanent magnet component structure is used to achieve axial suspension, and a hybrid suspension bearing system with full-degree-of-freedom constraints is formed with a radial air suspension component. In certain applications, the system structure can be simplified, product costs can be reduced, and the stability and support stiffness of the bearing system can be improved, thereby overcoming the limitations of simple air suspension bearings and making the application of suspension bearings more extensive and high-end.
Claims
1. A hybrid suspension bearing mechanism, characterized in that: It comprises an air suspension bearing and a magnetic suspension bearing, which are installed together in a casing; after the several parts of the hybrid suspension bearing mechanism are fully assembled, there will be a coaxial hole for installing the shaft core of a suspension rotor system; wherein, the air suspension bearing is used to provide radial restraint force for the rotor system, and the magnetic suspension bearing is used to provide axial restraint force for the rotor system, and the air suspension bearing and the magnetic suspension bearing together ensure the contactless rotation operation of the rotor system.
2. The hybrid suspension bearing mechanism according to claim 1, characterized in that: The magnetic bearing comprises a set of three parallel coaxial magnetic rings; the middle magnetic ring is a dynamic magnetic ring fixedly mounted on the shaft end and rotating with the shaft core; there is a static magnetic ring on each axial side of the dynamic magnetic ring that does not rotate with the shaft core; one of the static magnetic rings N 7 is located inside the shaft end, another static magnetic ring W 8 is located outside the shaft end; the two static magnetic rings are fixed together on the same magnetic ring housing assembly to form a static magnetic ring assembly; when the three magnetic rings are magnetized, it is ensured that the two adjacent magnetic rings are in opposite axial magnetic directions to form an axial repulsive force to provide a restraining force that does not contact the static magnetic ring assembly in the axial direction when the rotor system rotates; the dynamic magnetic ring and the magnetic ring housing assembly are provided with a gap in the radial direction and have no contact.
3. The hybrid suspension bearing mechanism according to claim 2, characterized in that: The three magnetic rings have the same appearance and can be replaced with each other before magnetization.
4. The hybrid suspension bearing mechanism according to claim 2, characterized in that: The static magnetic ring outside the shaft end W 8 has no inner hole, that is, it is a complete round magnetic piece.
5. The hybrid suspension bearing mechanism according to claim 2, characterized in that: The magnetic ring shell component is made of magnetic conductive material.
6. The hybrid suspension bearing mechanism according to claim 2, characterized in that: Two ends of the shaft core are respectively provided with a magnetic suspension bearing.
7. The hybrid suspension bearing mechanism according to claim 2, characterized in that: A plurality of air bearings are arranged on a shaft core.
8. The hybrid suspension bearing mechanism according to claim 5, characterized in that: The magnetic ring housing assembly includes a magnetic ring housing and a magnetic ring housing cover.
9. A motor-driven hybrid suspension rotor system, characterized in that: A hybrid suspension bearing as claimed in any one of the above claims is used; wherein the rotor of the motor is fixedly connected to the shaft core to form a rotor system.
10. The motor-driven hybrid suspension rotor system according to claim 9, characterized in that: The rotor of the motor is located between bearings on the shaft core. There is a magnetic suspension bearing at each end of the motor and a plurality of air suspension bearings in the middle.