# US 10,767,692 B2 · Magnetic levitation bearing assembly and compressor

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- Number: US 10,767,692 B2
- Document ID: US10767692B2
- Status: Granted
- Kind: B2
- Application number: 16/077,618
- Filed: 2017-01-22
- Published: 2019-03-21
- Granted: 2020-09-08
- Earliest claimed: 2016-03-31
- Assignees: Gree Green Refrigeration Technology Center Co., Ltd. of Zhuhai
- Applicants: Gree Green Refrigeration Technology Center Co., Ltd. of Zhuhai
- Inventors: Gao Gong; Yusheng Hu; Xiaobo Zhang; Jianning Liu; Fang Zhang; Siyuan Tian; Jinxin Jia; Changguang Guo; Guanghai Li; Qiong Wei
- Web page: https://patentgrep.com/patent/US10767692B2

## CPC

- F16C 32/048: {with active support of two degrees of freedom, e.g. radial magnetic bearings}
- F04D 29/058: magnetic; electromagnetic
- F16C 32/0417: {for axial load mainly}
- F16C 32/0427: {for axial load mainly}
- F16C 32/0476: {with active support of one degree of freedom, e.g. axial magnetic bearings}
- F16C 2360/44: Centrifugal pumps
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A magnetic levitation bearing assembly, including: a magnetic levitation bearing, a shell, and a working clearance adjusting device; the magnetic levitation bearing includes a first iron core, a second iron core and a thrust disk; the working clearance adjusting device is arranged between a radial inner periphery of the shell and the thrust disk along the radial direction, and between the shell and the second iron core along the axial direction; an axial end of the working clearance adjusting device is abutted against the second iron core, a void gap is provided between the shell and the second iron core, an adjustment on the magnetic levitation bearing working clearance is made possible by altering the length between two axial ends of the working clearance adjusting device, such that the working clearance is consistent with a design value.

## Claims

### Claim 1

A magnetic levitation bearing assembly, comprising:
a magnetic levitation bearing, comprising a first iron core, a second iron core and a thrust disc, wherein the thrust disc is arranged between the first iron core and the second iron core along an axial direction of the thrust disc, a first working clearance exists between the first iron core and the thrust disc, and a second working clearance exists between the second iron core and the thrust disc;
a shell, the first iron core and the second iron core are both fixedly connected with the shell; and
a working clearance adjusting device, disposed between a radial inner periphery of the shell and the thrust disc along a radial direction of the thrust disc and between the shell and the second iron core along the axial direction of the thrust disc, wherein an axial end of the working clearance adjusting device abuts against the second iron core, a void gap exists between the shell and the second iron core, and the working clearance adjusting device is configured to adjust a sum of the first working clearance and the second working clearance to conform to a preset value,
wherein the working clearance adjusting device is disposed between the first iron core and the second iron core along the axial direction of the thrust disc, and the other axial end of the working clearance adjusting device abuts against the first iron core,
wherein the magnetic levitation bearing assembly further comprise a first coil and a second coil, wherein the first iron core is provided with a first coil accommodating portion for mounting the first coil and a first mounting portion for connecting the shell, the second iron core is provided with a second coil accommodating portion for mounting the second coil and a second mounting portion for connecting the shell, and the working clearance adjusting device is disposed between the first mounting portion and the second mounting portion along the axial direction of the thrust disc, two axial ends of the working clearance adjusting device respectively abutting against the first mounting portion and the second mounting portion, and
wherein a radial size of the second mounting portion is greater than that of the first mounting portion, and the shell is provided with a step-shaped matching portion for matching with the first mounting portion and the second mounting portion, the step-shaped matching portion being provided with a first mounting segment and a second mounting segment with a diameter greater than that of the first mounting segment and connected with the first mounting segment through a stepped surface, wherein the stepped surface is fitted with an end of the first mounting portion away from the thrust disc, and the void gap exists between an end of the second mounting segment away from the first mounting segment and another end of the second mounting portion close to the thrust disc.

### Claim 2 (depends on 1)

The magnetic levitation bearing assembly according to claim 1, wherein an end of the first mounting portion close to the thrust disc is farther from the thrust disc relative to an end of the first coil accommodating portion close to the thrust disc, and an end of the second mounting portion close to the thrust disc is farther from the thrust disc relative to an end of the second coil accommodating portion close to of the thrust disc.

### Claim 3 (depends on 1)

The magnetic levitation bearing assembly according to claim 1, wherein the working clearance adjusting device comprises a plurality of working clearance adjusting members, and lengths between the two axial ends of each of the plurality of working clearance adjusting members are all different, so that different deviations of the sum of the first working clearance and the second working clearance from the preset value is adjusted by disposing different working clearance adjusting members between the shell and the second iron core.

### Claim 4 (depends on 3)

The magnetic levitation bearing assembly according to claim 3, wherein the working clearance adjusting member is a working clearance adjusting ring.

### Claim 5 (depends on 4)

The magnetic levitation bearing assembly according to claim 4, wherein a radial outer periphery of the working clearance adjusting ring abuts against the radial inner periphery of the shell.

### Claim 6 (depends on 1)

The magnetic levitation bearing assembly according to claim 1, wherein a length between the two axial ends of the working clearance adjusting device is adjustable to conform the sum of the first working clearance and the second working clearance to the preset value.

### Claim 7 (depends on 6)

The magnetic levitation bearing assembly according to claim 6, wherein the working clearance adjusting device comprises a first adjusting ring, a second adjusting ring and a locking member, one end of the first adjusting ring is provide with first threads, one end of the second adjusting ring is provided with second threads, the second threads are matched with the first threads to connect the first adjusting ring with the second adjusting ring, the length between the two axial ends of the working clearance adjusting device is adjustable through relative rotation of the first adjusting ring and the second adjusting ring, so that the sum of the first working clearance and the second working clearance conforms to the preset value, and the locking member is configured to lock a position of the first threads relative to the second threads.

### Claim 8 (depends on 1)

A compressor, comprising the magnetic levitation bearing assembly according to claim 1.