Bearing device, motor and compressor
By using symmetrically arranged displacement sensor probes and magnetic levitation bearings, the rotational vibration problem caused by parallelism error in thrust bearings was solved, achieving a bearing device with high-precision control and low noise, and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CARRIER CORP
- Filing Date
- 2024-11-12
- Publication Date
- 2026-05-12
AI Technical Summary
In existing thrust bearings, the parallelism error between the thrust disk and the sensor disk causes rotational vibration signals at the same frequency, affecting control performance.
The first and second displacement sensor probes are symmetrically arranged and connected to the excitation source module via a coaxial cable to detect the relative displacement between the thrust disk and the sensor disk. Combined with the magnetic levitation bearing, the rotating shaft is automatically adjusted.
Accurately determine the tilt of the shaft, reduce sensor errors, improve control precision, extend bearing life, reduce noise, and lower initial costs.
Smart Images
Figure CN122014747A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigeration / cooling equipment technology, specifically to a bearing device and an electric motor and compressor using the bearing device. Background Technology
[0002] Bearing assemblies are key components in machinery used to support and guide rotating or reciprocating motion parts. They reduce friction and improve mechanical efficiency and stability. Thrust bearings, in particular, are mechanical bearings specifically designed to withstand axial loads (i.e., loads along the axial direction). Unlike other types of bearings, thrust bearings primarily handle axial forces to support the stable operation of rotating components.
[0003] The thrust bearing contains a thrust disk and a sensor disk surrounding the shaft, which are typically arranged parallel to each other. However, during motor manufacturing, rotor manufacturing, or assembly, errors may occur in the thrust disk and sensor disk as the shaft rotates, affecting their parallelism. This parallelism error can introduce rotational vibration signals into the control system, impacting control performance. Summary of the Invention
[0004] This application aims to provide a bearing assembly and an electric motor and compressor using the bearing assembly, so as to at least solve or alleviate some of the problems existing in the prior art.
[0005] This application provides a bearing device, comprising: a rotating shaft; a first bearing surrounding the rotating shaft; a second bearing surrounding the rotating shaft parallel to the first bearing; a thrust disk fixed to the rotating shaft and sleeved 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 including a first sensor probe disposed on the sensor disk; and a second displacement sensor including a second sensor probe symmetrically disposed on the sensor disk with respect to the first sensor probe.
[0006] In the optional technical solution, the bearing device also includes 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.
[0007] In optional technical solutions, the bearing device also includes an excitation source module that is electrically connected in series with the first sensor probe and the second sensor probe.
[0008] In an optional technical solution, the bearing device further includes a third sensor probe disposed on the sensor disk; and a fourth sensor probe disposed symmetrically on the sensor disk with respect to the third sensor probe; wherein, 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.
[0009] In the optional technical solution, the electrical connection between the first excitation source module and the first sensor probe is a coaxial cable connection; the electrical connection between the second excitation source module and the second sensor probe is a coaxial cable connection.
[0010] In the optional technical solution, the series electrical connection between the excitation source module and the first sensor probe and the second sensor probe, or the series electrical connection between the excitation source module and the first sensor probe, the second sensor probe, the third sensor probe and the fourth sensor probe, is achieved through a coaxial cable.
[0011] In the optional technical solutions, 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 that include an iron core and a coil.
[0012] In the optional technical solutions, the first bearing and / or the second bearing are magnetic levitation bearings.
[0013] Another aspect of this application provides an electric motor having the bearing device provided in any of the above-described technical solutions.
[0014] Another aspect of this application provides a compressor having the bearing device provided in any of the above-described technical solutions. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the bearing device shaft in a balanced position according to one embodiment of this application.
[0016] Figure 2 This is a schematic diagram of the structure in which the bearing device shaft undergoes radial displacement in one embodiment of this application.
[0017] Figure 3 This is a schematic diagram of the bearing device provided in one embodiment of this application.
[0018] Figure 4 This is a schematic diagram of the bearing device provided in one embodiment of this application.
[0019] Figure 5 This is a plan view of a sensor disk provided in one embodiment of this application.
[0020] Reference numerals: bearing device 1, rotating shaft 101, first bearing 102, second bearing 103, thrust disk 104, sensor disk 105, first displacement sensor 106, second displacement sensor 107, first sensor probe 1051, second sensor probe 1052, third sensor probe 1053, fourth sensor probe 1054, first excitation source module 108, second excitation source module 109, excitation source module 110. Detailed Implementation
[0021] It should be noted that the following will use examples to illustrate the working principle, features and advantages of the bearing device according to this application. However, it should be understood that all descriptions are given for illustrative purposes only and should not be construed as limiting the present application in any way.
[0022] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.
[0023] <First Implementation Method>
[0024] Figure 1 This is a schematic diagram of the bearing device 1 with the shaft 101 in a balanced position according to one embodiment of this application. (See attached diagram.) Figure 1 As shown, the bearing device 1 involved in the embodiments of this application includes: a rotating shaft 101, a first bearing 102, a second bearing 103, a thrust disk 104, a sensor disk 105, a first displacement sensor 106, a second displacement sensor 107, a first sensor probe 1051, and a second sensor probe 1052.
[0025] like Figure 1 As shown, the bearing device 1 mainly consists of a first bearing 102 and a second bearing 103 arranged parallel to each other, and a rotating shaft 101. The first bearing 102 and the second bearing 103 are annular hollow structures and are respectively arranged around both ends of the rotating shaft 101. Simultaneously, the inner diameters of the first bearing 102 and the second bearing 103 are controlled to be slightly larger than the diameter of the rotating shaft 101, so that the bearing device 1 operates while the rotating shaft 101 is in a balanced position (e.g., ...). Figure 1 When the shaft 101 is in the position shown, there is no direct contact between the shaft 101 and the first bearing 102 or the second bearing 103.
[0026] A thrust disk 104 is disposed between the first bearing 102 and the second bearing 103, directly contacting and fixed to the rotating shaft 101. During the rotation of the rotating shaft 101, the thrust disk 104 rotates together with the rotating shaft 101 without relative displacement. Between the thrust disk 104 and the first bearing 102 or the second bearing 103, a ring-shaped sensor disk 105 corresponding to the first bearing 102 or the second bearing 103 is also disposed around the rotating shaft 101. The sensor disk 105 does not directly contact the rotating shaft 101 but is fixed to other components (not shown) of the bearing assembly 1. The sensor disk 105 is also provided with a first displacement sensor 106 including a first sensor probe 1051 and a second displacement sensor 107 including a second sensor probe 1052. The first sensor probe 1051 and the second sensor probe 1052 are disposed symmetrically about the central axis of the rotating shaft 101 on the side of the sensor disk 105 facing the thrust disk 104. Preferably, the first displacement sensor 106 and the second displacement sensor 107 are axial sensors parallel to the central axis of the rotating shaft 101, so as to detect whether the sensor disk 105 and the thrust disk 104 have relative displacement through the first sensor probe 1051 and the second sensor probe 1052 which are axially arranged.
[0027] Figure 2 This is a schematic diagram of the structure of the bearing device 1 under radial displacement in one embodiment of this application, combined with... Figure 1 and Figure 2 As shown, when the rotating shaft 101 is in the equilibrium position (e.g.) Figure 1 When the rotating shaft 101 is in its normal position (as shown in the diagram), the sensor disk 105 and the thrust disk 104 are parallel to each other. However, when the rotating shaft 101 undergoes radial displacement during rotation (i.e., the central axis of the rotating shaft 101 deviates from its normal position and tilts, such as shifting to...), the sensor disk 105 and the thrust disk 104 are parallel to each other. Figure 2 When the rotating shaft 101 is in position shown, the thrust disk 104 will shift as the rotating shaft 101 shifts, but the sensor disk 105 will always remain in its original position. At this time, the parallel relationship between the thrust disk 104 and the sensor disk 105 is disrupted, resulting in relative displacement between them.
[0028] Figure 2 The diagram illustrates a scenario where the rotating shaft 101 tilts, causing a decrease in the distance between the first sensor probe 1051 and the thrust disk 104. In this case, the first sensor probe 1051 (or the second sensor probe 1052) detects a decrease in the distance between the thrust disk 104 and the sensor disk 105, while the second sensor probe 1052 (or the first sensor probe 1051) detects an increase in the distance between the thrust disk 104 and the sensor disk 105. Therefore, it can be determined that the side of the rotating shaft 101 closest to the sensor disk 105 is tilted towards the location of the second displacement sensor 107 (or the first displacement sensor 106).
[0029] Similarly, assuming that the first sensor probe 1051 (or the second sensor probe 1052) detects that the distance between the thrust disk 104 and the sensor disk 105 has increased, and the second sensor probe 1052 (or the first sensor probe 1051) detects that the distance between the thrust disk 104 and the sensor disk 105 has decreased, it can be determined that the side of the rotating shaft 101 closest to the sensor disk 105 is tilted towards the location of the first displacement sensor 106 (second displacement sensor 107).
[0030] According to the above embodiments of this application, since the distance change value X1 between the thrust disk 104 and the sensor disk 105 in the axial direction at the location of the first sensor probe 1051 can be detected by the first sensor probe 1051, and the distance change value X2 between the thrust disk 104 and the sensor disk 105 in the axial direction at the location of the second sensor probe 1052 can be detected by the second sensor probe 1052, the degree of tilt of the cross-sectional position of the thrust disk 104 can be detected based on the distance change value X1 and the distance change value X2, thereby determining whether the rotating shaft 101 is off the balance position and the degree of offset or tilt.
[0031] By using the above-described embodiments, an axial sensor can be used instead of a radial sensor that directly detects the radial displacement of the rotating shaft 101. This allows for the detection of the degree of inclination of the cross-sectional position of the thrust disk 104, thereby accurately determining the degree of inclination of the rotating shaft 101 that is fixedly connected to the thrust disk 104.
[0032] Simultaneously, changing the sensor arrangement from radial to axial reduces the space occupied by the sensor in the radial direction and also reduces the possibility of sensor detection errors caused by direct contact with the sensor when the rotating shaft 101 experiences a large offset. Furthermore, by arranging the first sensor probe 1051 and the second sensor probe 1052 symmetrically about the central axis of the rotating shaft 101, the degree of offset of the rotating shaft 101 can be determined by combining the detection results of the first sensor probe 1051 and the second sensor probe 1052, avoiding errors that may occur when using only a single displacement sensor or a single sensor probe.
[0033] In a preferred embodiment of this application, the first bearing 102 and / or the second bearing 103 are magnetic levitation bearings.
[0034] Through the above implementation method, using magnetic levitation bearings as the first bearing 102 and / or the second bearing 103 eliminates mechanical contact between the rotating shaft 101 and the first bearing 102 and the second bearing 103. This reduces wear on the rotating shaft 101, the first bearing 102, and the second bearing 103 without the need for lubrication, thus extending the service life of the bearing assembly 1. Simultaneously, because there is no mechanical contact between the rotating shaft 101 and the first bearing 102 and the second bearing 103 during operation, noise that may be generated during the operation of the bearing assembly 1 is reduced. When the first displacement sensor 106 and the second displacement sensor 107 detect a misalignment of the rotating shaft 101, the magnetic force of the first bearing 102 or the second bearing 103 can be adjusted by controlling the current of the first bearing 102 or the second bearing 103, thereby returning the rotating shaft 101 to its equilibrium position. This avoids the problem of requiring significant adjustments to the bearing assembly 1 when the rotating shaft 101 is misaligned, as is common with mechanical bearings.
[0035] <Second Implementation Method>
[0036] The bearing device 1 provided in the second embodiment of this application is the same as the bearing device 1 in the above-described embodiments of this application, and all use the same name or symbols for description. Therefore, it will not be described again here.
[0037] Figure 3 A schematic diagram of the structure of a bearing device 1 provided in the second embodiment of this application is shown below. Figure 3 As shown, the bearing device 1 provided in the second embodiment of this application further includes: a first excitation source module 108 and a second excitation source module 109.
[0038] The first excitation source module 108 is electrically connected to the first sensor probe 1051, and the second excitation source module 109 is electrically connected to the second sensor probe 1052. That is, the two sensor probes are connected in parallel, and the first sensor probe 1051 and the second sensor probe 1052 operate independently, each with an independent excitation source module.
[0039] Since the first sensor probe 1051 and the second sensor probe 1052 are connected in parallel and work independently, they need to be calibrated and linearized separately before use to ensure consistent accuracy. The first sensor probe 1051 is electrically connected to the first excitation source module 108, and the second sensor probe 1052 is electrically connected to the second excitation source module 109. After obtaining the first displacement data detected by the first sensor probe 1051 (i.e., the distance change value X1 between the thrust disk 104 and the sensor disk 105 corresponding to the position of the first sensor probe 1051) and the second displacement data detected by the second sensor probe 1052 (i.e., the distance change value X2 between the thrust disk 104 and the sensor disk 105 corresponding to the position of the second sensor probe 1052), the arithmetic mean of the first and second displacement data is calculated. This calculated result is used as the actual offset or tilt data of the rotating shaft 101, and the position of the rotating shaft 101 is adjusted accordingly.
[0040] Through the above implementation method, the first sensor probe 1051 and the second sensor probe 1052 are connected in parallel to work independently and record the first displacement data and the second displacement data respectively. The actual displacement data is then calculated from the first displacement data and the second displacement data. The first sensor probe 1051 and the second sensor probe 1052 do not affect each other, which can improve the accuracy of the output results of the first displacement sensor 106 and the second displacement sensor 107. At the same time, the magnetic force of the first bearing 102 and the second bearing 103 can be controlled more flexibly based on the first displacement data and the second displacement data, so that the rotating shaft 101 can quickly return to the equilibrium position.
[0041] In a preferred embodiment of this application, the electrical connection between the first excitation source module 108 and the first sensor probe 1051 is a coaxial cable connection, and the electrical connection between the second excitation source module 109 and the second sensor probe 1052 is a coaxial cable connection.
[0042] Coaxial cable is a widely used type of cable, primarily used for signal transmission. From the inside out, it consists of a central conductor responsible for signal transmission, an insulating layer to prevent signal leakage, an outer conductor to prevent external electromagnetic interference, and a protective outer sheath. The signal propagates in the central conductor, while the outer conductor serves as the signal return path and shields against external interference. Using coaxial cables reduces external signal interference to a certain extent, improving signal stability and transmission efficiency.
[0043] It should be noted that the embodiments of this application do not limit the specific model and specifications of the coaxial cable. Different coaxial cables are selected according to different transmission distances, signal frequencies and environmental conditions to achieve the best signal transmission performance, and all such settings should be included within the protection scope of this application.
[0044] <Third Implementation Method>
[0045] The bearing device 1 provided in the third embodiment of this application is the same as the bearing device 1 in the above-described embodiments of this application, and all use the same name or symbols for description. Therefore, it will not be described again here.
[0046] Figure 4 This is a schematic diagram of the bearing device 1 provided in the third embodiment of this application, as shown below. Figure 4 As shown, unlike the first embodiment, the bearing device 1 provided in this application further includes an excitation source module 110, and the excitation source module 110 is electrically connected in series with the first sensor probe 1051 and the second sensor probe 1052.
[0047] Unlike parallel connections, the first sensor probe 1051 and the second sensor probe 1052 are connected in series. Since both probes are connected to the same excitation source module 110, their accuracy is consistent. Therefore, there is no need to calibrate and linearize them separately before use, simplifying operation. Furthermore, the first displacement signal obtained by the first sensor probe 1051 and the second displacement signal obtained by the second sensor probe 1052 can be automatically compensated by hardware, outputting the compensated actual displacement signal without software calculation. This allows the bearing device 1 to obtain the actual displacement signal of the shaft 101 more quickly and control the shaft 101 to make timely adjustments. Using a series connection instead of a parallel connection also reduces the number of excitation source modules in the bearing device 1, lowering its initial cost.
[0048] In a preferred embodiment of this application, the series electrical connection between the excitation source module 110 and the first sensor probe 1051 and the second sensor probe 1052 is achieved through a coaxial cable.
[0049] Through the above implementation, the first sensor probe 1051, the second sensor probe 1052, and the excitation source module 110 are connected via a coaxial cable, which reduces external signal interference to a certain extent and improves signal stability and transmission efficiency. The first sensor probe 1051 and the second sensor probe 1052 are connected via a well-shielded coaxial cable, avoiding the potential for signal interference and errors in the output actual displacement signal caused by the close proximity of the connection lines between the first sensor probe 1051 and the second sensor probe 1052.
[0050] <Fourth Implementation Method>
[0051] The bearing device 1 provided in the fourth embodiment of this application is the same as the bearing device 1 in the above-described embodiments of this application, and all use the same name or symbols for description. Therefore, it will not be described again here.
[0052] Figure 5 This is a plan view of the sensor disk 105 provided in the fourth embodiment of this application, as shown below. Figure 5 As shown, unlike the above-described embodiments, the bearing device 1 provided in this application further includes: a third sensor probe 1053 and a fourth sensor probe 1054.
[0053] Among them, such as Figure 5 As shown, the third sensor probe 1053 and the fourth sensor probe 1054 are disposed on the sensor disk 105, and are arranged symmetrically about the central axis of the rotating shaft 101 on the side of the sensor disk 105 facing the thrust disk 104. The excitation source module 110 is electrically connected to the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054 in series. Preferably, the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054 are inductive sensor probes including an iron core and a coil.
[0054] Through the above implementation method, the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054, connected in series, jointly detect the relative displacement between the thrust disk 104 and the sensor disk 105 at different positions, and output the actual displacement signal. Because the first sensor probe 1051 and the second sensor probe 1052 can only obtain the cross-sectional tilt data of the thrust disk 104 at one angle, while the addition of the third sensor probe 1053 and the fourth sensor probe 1054 can obtain the cross-sectional tilt data of the thrust disk 104 at more angles, thereby obtaining the displacement offset data of the rotating shaft 101 in multiple directions, and more accurately controlling the adjustment of the rotating shaft 101.
[0055] In a preferred embodiment of this application, the series electrical connection between the excitation source module 110 and the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053 and the fourth sensor probe 1054 is achieved by a coaxial cable.
[0056] Through the above implementation, the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054 are connected in series with the excitation source module 110 via coaxial cables, which reduces external signal interference to a certain extent and improves signal stability and transmission efficiency. The first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054 are connected via well-shielded coaxial cables, avoiding the potential for signal interference and errors in the output actual displacement signal caused by the close proximity of the connection lines between these sensors.
[0057] Although this embodiment is described with the first sensor probe 1051, the second sensor probe 1052, the third sensor probe 1053, and the fourth sensor probe 1054, this application is not limited thereto. Any arrangement of 2n sensor probes in a symmetrical manner should be included within the protection scope of this application, wherein n is preferably a positive integer not greater than 4.
[0058] In a preferred embodiment of this application, 2n sensor probes are arranged symmetrically around the sensor disk 105 at equal intervals. When n is 2, the four sensor probes are arranged in a square. When n is 3, the six sensor probes are arranged in a regular hexagon. When n is 4, the eight sensor probes are arranged in a regular octagon.
[0059] It should be noted that, similar to the second or third embodiment, the sensor probe of this application can be connected in series with 2n sensor probes by an excitation source module, and the arithmetic mean of the displacement offset data detected by the 2n sensor probes is calculated. The calculated result is used as the actual offset or tilt data of the rotating shaft 101, and the position of the rotating shaft 101 is adjusted according to the result. Alternatively, a first excitation source module, a second excitation source module, a third excitation source module, ..., a 2nth excitation source module can be set for the 2n sensor probes, so that each sensor probe is connected to an independent excitation source module, and each sensor independently outputs displacement offset data. The hardware automatically compensates and outputs the compensated actual displacement signal, eliminating the need for software calculation. This allows the bearing device 1 to obtain the actual displacement signal of the rotating shaft 101 more quickly and control the rotating shaft 101 to make adjustments in a timely manner.
[0060] Another aspect of this application provides an electric motor (not shown), wherein the electric motor includes the bearing device 1 provided in any of the above embodiments.
[0061] Another aspect of this application provides a compressor (not shown), wherein the compressor includes the bearing device 1 provided in any of the above embodiments.
Claims
1. A bearing device, characterized in that, include: Shaft; A first bearing surrounds the rotating shaft; A second bearing surrounds the shaft, parallel to the first bearing; A thrust disc is sleeved and fixed to the rotating shaft between the first bearing and the second bearing; A sensor disk is disposed around the rotating shaft, either between the first bearing and the thrust disk, or between the second bearing and the thrust disk. A first displacement sensor including a first sensor probe, wherein the first sensor probe is disposed on the sensor disk; A second displacement sensor includes a second sensor probe, which is symmetrically arranged on the sensor disk with respect to the first sensor probe.
2. The bearing device as described in claim 1, characterized in that, It also includes, The first excitation source module is electrically connected to the first sensor probe; The second excitation source module is electrically connected to the second sensor probe.
3. The bearing device as described in claim 1, characterized in that, It also includes, The excitation source module is electrically connected in series with the first sensor probe and the second sensor probe.
4. The bearing device as described in claim 3, characterized in that, It also includes, The third sensor probe is mounted on the sensor disk; The fourth sensor probe is symmetrically arranged on the sensor disk with respect to the third sensor probe; 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.
5. The bearing device as described in claim 2, characterized in that, The electrical connection between the first excitation source module and the first sensor probe is a coaxial cable connection; The electrical connection between the second excitation source module and the second sensor probe is via a coaxial cable.
6. The bearing device as described in claim 4, characterized in that, The excitation source module is electrically connected in series with the first sensor probe and the second sensor probe, or 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, via a coaxial cable.
7. The bearing device as described in claim 2 or 4, characterized in that, The first sensor probe, the second sensor probe, the third sensor probe, and the fourth sensor probe are inductive sensor probes that include an iron core and a coil.
8. The bearing device according to any one of claims 1-3, characterized in that, The first bearing and / or the second bearing are magnetic levitation bearings.
9. An electric motor, characterized in that, Includes the bearing device as described in any one of claims 1-8.
10. A compressor, characterized in that, Includes the bearing device as described in any one of claims 1-8.