Three-phase asynchronous motor bearing temperature measurement structure

Abstract

The utility model relates to a three-phase asynchronous motor bearing temperature measurement structure, which structurally comprises a first temperature sensor arranged in an open hole of an end cover and a second temperature sensor arranged in an open hole of a motor shaft, and the first temperature sensor and the second temperature sensor are respectively contacted with an outer ring and an inner ring of a bearing. The first temperature sensor and the second temperature sensor are thermal resistance temperature sensors, bearings are installed at two ends of the motor shaft, bearing inner rings are contacted and fixed with the motor shaft, end covers are installed outside the bearings, and bearing outer rings are contacted and fixed with the end covers. The temperature of inner and outer rings of the bearing can be detected simultaneously. The thermal resistance sensor has the advantages that the structural design is reasonable, the structures of the end cover and the motor shaft are optimized, the thermal resistance sensor can detect the temperature of the inner ring and the outer ring of the bearing at the same time, the bearing temperature analysis is more accurate, the motor working condition can be analyzed more effectively, and the service life of the bearing can be prolonged.

Description

Technical Field

[0001] The utility model relates to a bearing temperature measurement structure, specifically to a three-phase asynchronous motor bearing temperature measurement structure based on VMD-SVM. Background Technique

[0002] In the prior art, the thermometers used in the bearing temperature measurement device of a three-phase asynchronous motor are generally expansion thermometers, semiconductor pyrometers, digital multimeters and clamp meters with the function of pyrometers, infrared thermometers, etc. The problems of these thermometers are that they cannot be in direct contact with the bearing, and there are errors between the measured temperature and the bearing temperature; on the other hand, if a thermal resistor is used, only the temperature of the outer ring of the bearing can be detected. Content of the Utility Model

[0003] A three-phase asynchronous motor bearing temperature measurement structure proposed by the utility model aims to overcome the above deficiencies in the prior art and realize the simultaneous detection of the temperatures of the inner and outer rings of the bearing.

[0004] The technical solution of the utility model: A three-phase asynchronous motor bearing temperature measurement structure, the structure of which includes a first temperature sensor installed in the opening of the end cover and a second temperature sensor installed in the opening of the motor shaft. The first temperature sensor and the second temperature sensor are in contact with the outer ring and the inner ring of the bearing respectively. The first temperature sensor and the second temperature sensor are thermal resistor temperature sensors. Bearings are installed at both ends of the motor shaft, the inner ring of the bearing is in contact and fixed with the motor shaft, an end cover is installed outside the bearing, and the outer ring of the bearing is in contact and fixed with the end cover. Realize the simultaneous detection of the temperatures of the inner and outer rings of the bearing.

[0005] Preferably, the end cover is radially provided with a first installation hole, the first temperature sensor is installed in the first installation hole and is in contact with the outer ring of the bearing at the inner end of the first installation hole, and the lead wire of the first temperature sensor is led out from the outer end of the first installation hole.

[0006] Preferably, a deep hole extending from the tail end to near the other end is axially opened in the center of the motor shaft. A second installation hole with an inner end communicating with the deep hole is radially opened at the corresponding position of the motor shaft and the bearing. The second temperature sensor is installed in the second installation hole and is in contact with the inner ring of the bearing at the outer end of the second installation hole. The lead wire of the second temperature sensor passes through the inner end of the second installation hole and is led out from the outer end of the deep hole.

[0007] The advantages of the utility model: The structure design is reasonable, the structures of the end cover and the motor shaft are optimized, so that the thermal resistor sensor can simultaneously detect the temperatures of the inner and outer rings of the bearing, the analysis of the bearing temperature is more accurate, the analysis of the motor working conditions can be more effective, and the service life of the bearing can be extended. Description of the Drawings

[0008] Figure 1It is a schematic structural diagram of the bearing temperature measurement structure of the three-phase asynchronous motor of the present utility model.

[0009] Figure 2 It is Figure 1 a schematic structural diagram of the mounting hole of the outer ring of the bearing (end cover) in

[0010] Figure 3 It is Figure 2 a schematic structural diagram when installing the temperature sensor in the mounting hole of the outer ring of the bearing (end cover).

[0011] Figure 4 It is Figure 1 a schematic structural diagram of the mounting hole of the inner ring of the bearing (motor shaft) in

[0012] Figure 5 It is Figure 4 the top view of

[0013] Figure 6 It is Figure 4 a schematic structural diagram when installing the temperature sensor in the mounting hole of the inner ring of the bearing (motor shaft).

[0014] In the figure, 1 is the end cover, 11 is the first mounting hole, 2 is the bearing, 3 is the motor shaft, 31 is the second mounting hole, 32 is the deep hole, 4 is the first temperature sensor, 5 is the second temperature sensor, and 6 is the display control device. Specific embodiments

[0015] The present utility model will be further described in detail below in conjunction with the embodiments and specific implementation manners.

[0016] As Figures 1-6 shown, a bearing temperature measurement structure of a three-phase asynchronous motor includes a first temperature sensor 4 installed in the opening of the end cover 1 and a second temperature sensor 5 installed in the opening of the motor shaft 3. The first temperature sensor 4 and the second temperature sensor 5 are respectively in contact with the outer ring and the inner ring of the bearing 2, and the first temperature sensor 4 and the second temperature sensor 5 are resistance temperature sensors.

[0017] As the basic structure of the motor, bearings 2 are installed at both ends of the motor shaft 3. The inner ring of the bearing 2 is in contact and fixed with the motor shaft 3, and an end cover 1 is installed outside the bearing 2. The outer ring of the bearing 2 is in contact and fixed with the end cover 1. During operation, the outer ring of the bearing is fixed, and the inner ring rotates with the motor shaft 3.

[0018] Specifically, the end cover 1 is radially provided with a first mounting hole 11. The first temperature sensor 4 is installed in the first mounting hole 11 and contacts the outer ring of the bearing 2 at the inner end of the first mounting hole 11. The lead wire of the first temperature sensor 4 is led out from the outer end of the first mounting hole 11. A deep hole 32 extending from the tail end to near the other end is axially opened in the center of the motor shaft 3. A second mounting hole 31 whose inner end communicates with the deep hole 32 is radially opened at the position corresponding to the bearing 2 on the motor shaft 3. The second temperature sensor 5 is installed in the second mounting hole 31 and contacts the inner ring of the bearing 2 at the outer end of the second mounting hole 31. The lead wire of the second temperature sensor 5 passes through the inner end of the second mounting hole 31 and is led out from the outer end of the deep hole 32.

[0019] The lead wires of the first temperature sensor 4 and the second temperature sensor 5 are externally connected to a display control device 6.

[0020] During specific processing, the following steps are included:

[0021] 1. Drill the first mounting hole 11 for installing the first temperature sensor 4 on the end cover 1, as Figure 2 ;

[0022] 2. Drill a deep hole 32 from the center of the tail of the motor shaft 3. The deep hole 32 should pass through the position of the front bearing 2. Drill the second mounting hole 31 at the positions of the front and rear bearings 2 on the motor shaft 3, which communicates with the deep hole 32 at the center of the tail of the motor shaft 3, as Figure 4 、 5 ;

[0023] 3. Place the second temperature sensors 5 on the inner rings of the front and rear bearings 2 into the second mounting holes 31 on the motor shaft 3, as Figure 6 ;

[0024] 4. Install the bearing 2 on the motor shaft 3, then install the motor shaft 3 with the bearing 2 on the end cover 1, and then install the first temperature sensor 4, as Figure 3 。

[0025] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A temperature measuring structure for the bearings of a three-phase asynchronous motor, characterized in that, It includes a first temperature sensor (4) installed in the opening of the end cover (1) and a second temperature sensor (5) installed in the opening of the motor shaft (3). The first temperature sensor (4) and the second temperature sensor (5) are respectively in contact with the outer ring and the inner ring of the bearing (2). The first temperature sensor (4) and the second temperature sensor (5) are thermal resistance temperature sensors. Bearings (2) are installed at both ends of the motor shaft (3). The inner ring of the bearing (2) is in contact and fixed with the motor shaft (3). An end cover (1) is installed outside the bearing (2). The outer ring of the bearing (2) is in contact and fixed with the end cover (1).

2. The temperature measurement structure of a three-phase asynchronous motor bearing according to claim 1, characterized in that, The end cover (1) is radially provided with a first mounting hole (11). The first temperature sensor (4) is installed in the first mounting hole (11) and is in contact with the outer ring of the bearing (2) at the inner end of the first mounting hole (11). The lead wire of the first temperature sensor (4) is led out from the outer end of the first mounting hole (11).

3. A temperature measurement structure for the bearings of a three-phase asynchronous motor as described in claim 1, characterized in that, A deep hole (32) extending from the tail end to near the other end is axially opened in the center of the motor shaft (3). A second mounting hole (31) whose inner end communicates with the deep hole (32) is radially opened at the position corresponding to the bearing (2) on the motor shaft (3). The second temperature sensor (5) is installed in the second mounting hole (31) and is in contact with the inner ring of the bearing (2) at the outer end of the second mounting hole (31). The lead wire of the second temperature sensor (5) passes through the inner end of the second mounting hole (31) and is led out from the outer end of the deep hole (32).

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