CN-122014747-A - Bearing device, motor and compressor

Abstract

The application provides a bearing device, and a motor and a compressor comprising the bearing device. The bearing device comprises a rotating shaft, a first bearing and a second bearing which are parallel to each other and are arranged around the rotating shaft, a thrust disc fixed on the rotating shaft and a sensor disc which is parallel to the thrust disc and is arranged around the rotating shaft. The sensor disk is symmetrically provided with a first displacement sensor comprising a first sensor probe and a second displacement sensor comprising a second sensor probe. The first displacement sensor, the second displacement sensor and the excitation source module are connected in parallel or in series, so that the detection results of the first sensor probe and the second sensor probe are combined to obtain the deflection degree of the rotating shaft, and the parallelism error possibly occurring under the condition of singly using one displacement sensor or one sensor probe is avoided.

Inventors

• YU HAO
• CAO CHONG
• LI JIEDONG
• ZHANG ZHENYU

Assignees

• 开利公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (10)

1. 1. A bearing device, comprising: A rotating shaft; A first bearing surrounding the rotating shaft; a second bearing surrounding the rotating shaft in parallel with the first bearing; The thrust disc is sleeved and fixed on the rotating shaft between the first bearing and the second bearing; A sensor disk disposed around the rotation shaft between the first bearing and the thrust disk or between the second bearing and the thrust disk; a first displacement sensor comprising a first sensor probe, the first sensor probe being disposed at the sensor disc; a second displacement sensor comprising a second sensor probe symmetrically disposed to the sensor disc with respect to the first sensor probe.
2. 2. The bearing assembly of claim 1, further comprising, The first excitation source module is electrically connected with the first sensor probe; And the second excitation source module is electrically connected with the second sensor probe.
3. 3. The bearing assembly of claim 1, further comprising, And the excitation source module is electrically connected with the first sensor probe and the second sensor probe in series.
4. 4. The bearing assembly of claim 3, further comprising, A third sensor probe disposed on the sensor disc; a fourth sensor probe symmetrically disposed on the sensor disc with the third sensor probe; the excitation source module is electrically connected with the first sensor probe, the second sensor probe, the third sensor probe and the fourth sensor probe in series.
5. 5. A bearing assembly as defined in claim 2, wherein, The electrical connection between the first excitation source module and the first sensor probe is coaxial cable connection; The second excitation source module is electrically connected with the second sensor probe through a coaxial cable.
6. 6. The bearing assembly of claim 4, wherein the bearing assembly comprises a plurality of bearings, The excitation source module is electrically connected with the first sensor probe and the second sensor probe in series, or the excitation source module is electrically connected with the first sensor probe, the second sensor probe, the third sensor probe and the fourth sensor probe in series through coaxial cables.
7. 7. The bearing device according to claim 2 or 4, wherein the first sensor probe, the second sensor probe, the third sensor probe, and the fourth sensor probe are inductive sensor probes including an iron core and a coil.
8. 8. A bearing arrangement according to any one of claims 1-3, wherein the first bearing and/or the second bearing is a magnetic bearing.
9. 9. An electric motor comprising a bearing arrangement according to any one of claims 1-8.
10. 10. A compressor comprising a bearing arrangement according to any one of claims 1-8.

Description

Bearing device, motor and compressor Technical Field The application relates to the technical field of refrigeration/cooling equipment, in particular to a bearing device, and a motor and a compressor using the bearing device. Background Bearing devices are key components in machinery for supporting and guiding rotating or reciprocating components. It can reduce friction and raise mechanical efficiency and stability. Among them, a thrust bearing is a mechanical bearing specially adapted to bear axial loads (i.e., loads in the axial direction). Unlike other types of bearings, thrust bearings are used primarily to handle axial forces to support stable operation of the rotating components. The thrust bearing is provided with a thrust disc and a sensor disc which encircle the rotating shaft, and the thrust disc and the sensor disc are generally arranged in parallel. However, some errors may occur in the thrust disc and the sensor disc when the rotating shaft rotates during the process of manufacturing the motor, manufacturing or assembling the rotor, etc., thereby affecting the parallelism of the thrust disc and the sensor disc. Such parallelism errors may give the control system a rotational co-frequency vibration signal affecting the control performance. Disclosure of Invention The present application aims to provide a bearing device and a motor and a compressor using the bearing device, so as to solve or alleviate at least some of the problems of the prior art. The application provides a bearing device which comprises a rotating shaft, a first bearing surrounding the rotating shaft, a second bearing parallel to the first bearing and surrounding the rotating shaft, a thrust disk sleeved and fixed on the rotating shaft between the first bearing and the second bearing, a sensor disk surrounding the rotating shaft between the first bearing and the thrust disk or between the second bearing and the thrust disk, a first displacement sensor comprising a first sensor probe, wherein the first sensor probe is arranged on the sensor disk, and a second displacement sensor comprising a second sensor probe, and the second sensor probe and the first sensor probe are symmetrically arranged on the sensor disk. In an alternative technical scheme, the bearing device further comprises a first excitation source module electrically connected with the first sensor probe, and a second excitation source module electrically connected with the second sensor probe. In an alternative solution, the bearing device further comprises an excitation source module electrically connected in series with the first sensor probe and the second sensor probe. In an alternative technical scheme, the bearing device further comprises a third sensor probe arranged on the sensor disc, and a fourth sensor probe symmetrically arranged on the sensor disc with the third sensor probe, wherein the excitation source module is electrically connected with the first sensor probe, the second sensor probe, the third sensor probe and the fourth sensor probe in series. In an alternative technical scheme, the electrical connection between the first excitation source module and the first sensor probe is coaxial cable connection, and the electrical connection between the second excitation source module and the second sensor probe is coaxial cable connection. In an alternative technical scheme, the excitation source module is electrically connected with the first sensor probe and the second sensor probe in series, or the excitation source module is electrically connected with the first sensor probe, the second sensor probe, the third sensor probe and the fourth sensor probe in series through coaxial cables. In an alternative technical scheme, the first displacement sensor probe, the second displacement sensor probe, the third displacement sensor probe and the fourth displacement sensor probe are inductive sensor probes comprising an iron core and a coil. In an alternative embodiment, the first bearing and/or the second bearing are magnetic bearings. In another aspect of the present application, there is also provided an electric motor having the bearing device provided in any one of the above-mentioned aspects. In another aspect, the present application provides a compressor having the bearing device provided in any one of the above technical aspects. Drawings Fig. 1 is a schematic view of a bearing device according to an embodiment of the present application, in which a rotating shaft is at an equilibrium position. Fig. 2 is a schematic view of a structure in which a rotation shaft of a bearing device is radially offset according to an embodiment of the present application. Fig. 3 is a schematic structural view of a bearing device according to an embodiment of the present application. Fig. 4 is a schematic structural view of a bearing device according to an embodiment of the present application. Fig. 5 is a schematic plan view of a sensor disc provided in one embodiment of