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EP-4741673-A1 - BEARING DEVICE, MOTOR AND COMPRESSOR

EP4741673A1EP 4741673 A1EP4741673 A1EP 4741673A1EP-4741673-A1

Abstract

This application provides a bearing device (1), and a motor (2) and a compressor (3) including the bearing device (1). The bearing device (1) includes a rotating shaft (101), a first bearing (102) and a second bearing (103) disposed around the rotating shaft (101) and parallel to each other, a thrust disc (104) sleeved on and fixed to the rotating shaft (101), and a sensor disc (105) disposed around the rotating shaft (101) and parallel to the thrust disc (104). A first displacement sensor (106) including a first sensor probe (1051) and a second displacement sensor (107) including a second sensor probe (1052) are symmetrically disposed on the sensor disc (105). By connecting the first displacement sensor (106), the second displacement sensor (107), and an excitation source module (108, 109, 110) in parallel or in series, detection results of the first sensor probe (1051) and the second sensor probe (1052) are combined to obtain a degree of deviation of the rotating shaft (101), which avoids an error in the parallelism that may occur when one displacement sensor or one sensor probe is used alone.

Inventors

  • YU, HAO
  • CAO, Chong
  • LI, Jiedong
  • ZHANG, ZHENYU

Assignees

  • Carrier Corporation

Dates

Publication Date
20260513
Application Date
20251111

Claims (10)

  1. A bearing device (1) comprising: a rotating shaft (101); a first bearing (102) surrounding the rotating shaft; a second bearing (103) surrounding the rotating shaft in parallel with the first bearing; a thrust disc (104) sleeved on and fixed to the rotating shaft between the first bearing and the second bearing; a sensor disc (105) disposed around the rotating shaft between the first bearing and the thrust disc or between the second bearing and the thrust disc; a first displacement sensor (106) including a first sensor probe (1051) disposed on the sensor disc; and a second displacement sensor (107) including a second sensor probe (1052) disposed on the sensor disc symmetrically with respect to the first sensor probe.
  2. The bearing device (1) according to claim 1, further comprising: a first excitation source module (108) electrically connected to the first sensor probe (1051); and a second excitation source module (109) electrically connected to the second sensor probe (1052).
  3. The bearing device (1) according to claim 1, further comprising: an excitation source module (110) electrically connected in series with the first sensor probe (1051) and the second sensor probe (1052).
  4. The bearing device (1) according to claim 3, further comprising: a third sensor probe (1053) disposed on the sensor disc (105); and a fourth sensor probe (1054) disposed on the sensor disc symmetrically with respect to the third sensor probe, wherein the excitation source module (110) is electrically connected in series with the first sensor probe (1051), the second sensor probe (1052), the third sensor probe, and the fourth sensor probe.
  5. The bearing device (1) according to claim 2, wherein the first excitation source module (108) and the first sensor probe (1051) are electrically connected by a coaxial cable, and the second excitation source module (109) and the second sensor probe (1052) are electrically connected by a coaxial cable.
  6. The bearing device (1) according to claim 4, wherein the excitation source module (110) is electrically connected in series with the first sensor probe (1051) and the second sensor probe (1052) by a coaxial cable, or the excitation source module is electrically connected in series with the first sensor probe, the second sensor probe, the third sensor probe (1053), and the fourth sensor probe (1054) by a coaxial cable.
  7. The bearing device (1) according to any preceding claim, wherein the first sensor probe (1051), the second sensor probe (1052), the third sensor probe (1053), and the fourth sensor probe (1054) each are an inductive sensor probe including a core and a coil.
  8. The bearing device (1) according to any preceding claim, wherein the first bearing (102) and/or the second bearing (103) is a magnetic suspension bearing.
  9. A motor (2) comprising: the bearing device (1) according to any preceding claim.
  10. A compressor (3) comprising: the bearing device (1) according to any of claims 1 to 9.

Description

PRIORITY CLAIM This application claims benefit of Chinese Patent Application No. 202411611847.3, filed November 12, 2024, and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which in their entirety are herein incorporated by reference. BACKGROUND This application relates to the technical field of refrigeration/cooling equipment, and in particular to a bearing device, and a motor and a compressor using the bearing device. A bearing device is a key component in machinery for supporting and guiding a rotating or reciprocating component. The bearing device can reduce friction and improve mechanical efficiency and stability. A thrust bearing is a mechanical bearing specially configured to bear an axial load (that is, a load in an axial direction). Unlike other types of bearings, the thrust bearing is mainly used to handle an axial force to support stable operation of a rotating component. The thrust bearing is provided with a thrust disc and a sensor disc surrounding a rotating shaft, and the thrust disc and the sensor disc are generally arranged in parallel. However, in a process of motor manufacturing, rotor manufacturing or assembly, and the like, some errors may occur in the thrust disc and the sensor disc when the rotating shaft rotates, thereby affecting the parallelism between the thrust disc and the sensor disc. The error in the parallelism may bring a rotating co-frequency vibration signal to a control system, which affects the control performance. SUMMARY An object of this application is to provide a bearing device, and a motor and a compressor using the bearing device to at least solve or alleviate some problems existing in the related art. According to a first aspect of the invention there is provided a bearing device, including: a rotating shaft; a first bearing surrounding the rotating shaft; a second bearing surrounding the rotating shaft in parallel with the first bearing; a thrust disc sleeved on and fixed to the rotating shaft between the first bearing and the second bearing; a sensor disc disposed around the rotating shaft between the first bearing and the thrust disc or between the second bearing and the thrust disc; a first displacement sensor including a first sensor probe disposed on the sensor disc; and a second displacement sensor including a second sensor probe disposed on the sensor disc symmetrically with respect to the first sensor probe. The bearing device may include: a first excitation source module electrically connected to the first sensor probe; and a second excitation source module electrically connected to the second sensor probe. The bearing device may include an excitation source module electrically connected in series with the first sensor probe and the second sensor probe. The bearing device may include: a third sensor probe disposed on the sensor disc; and a fourth sensor probe disposed on the sensor disc symmetrically with respect to the third sensor probe, in which the excitation source module is electrically connected in series with the first sensor probe, the second sensor probe, the third sensor probe, and the fourth sensor probe. The first excitation source module and the first sensor probe may be electrically connected by a coaxial cable, and the second excitation source module and the second sensor probe may be electrically connected by a coaxial cable. The excitation source module may be electrically connected in series with the first sensor probe and the second sensor probe by a coaxial cable, or the excitation source module may be electrically connected in series with the first sensor probe, the second sensor probe, the third sensor probe, and the fourth sensor probe by a coaxial cable. The first displacement sensor probe, the second displacement sensor probe, the third displacement sensor probe, and the fourth displacement sensor probe may each be an inductive sensor probe including a core and a coil. The first sensor probe, the second sensor probe, the third sensor probe, and the fourth sensor probe may each be an inductive sensor probe including a core and a coil. The first bearing and/or the second bearing may be a magnetic suspension bearing. One or more embodiments of this application further provide a motor including the bearing device according to any one of the above technical solutions. One or more embodiments of this application further provide a compressor including the bearing device according to any one of the above technical solutions. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS Certain exemplary embodiments will now be described in greater detail by way of example only and with reference to the accompanying drawings in which: Fig. 1 is a schematic structural diagram of a rotating shaft of a bearing device at a balanced position;Fig. 2 is a schematic structural diagram showing a case where the rotating shaft of the bearing device radially deviates;Fig. 3 is a schematic structural diagram of a bearing device;F