A test device for the temperature rise of high-speed permanent magnet liquid-injected motor bearings

Abstract

The present invention provides a device for testing the temperature rise of a high-speed permanent magnet liquid-intake motor bearing, comprising a high-speed permanent magnet liquid-intake motor; a bearing to be tested is provided on the bearing housing of the high-speed permanent magnet liquid-intake motor; a bearing box of the high-speed permanent magnet liquid-intake motor is provided with a liquid inlet outlet and a blind hole for burying a thermistor temperature sensor; a gap exists between the blind hole and the bearing to be tested disposed in the bearing housing. Without destroying the motor structure, the present invention facilitates obtaining temperature rise data of the high-speed permanent magnet liquid-intake motor bearing when operating in a variety of aerospace power systems, providing a strong guarantee for the stable operation of the power system; under different liquid inlet media and different operating conditions, the temperature rise data of the bearing can be accurately measured in real time, and the test data provides a true and reliable reference basis for the application and selection of the bearing.

Description

Technical Field

[0001] The invention relates to a device for testing the temperature rise of a high-speed permanent magnet liquid-intake motor bearing, belongs to the technical field of electrical engineering, and is applied to high-speed permanent magnet motors. Background Art

[0002] With the rapid development of my country's aerospace field, high-speed permanent magnet liquid-injected motors are playing an increasingly important role in aerospace power systems. Bearings, as key high-precision components in high-speed permanent magnet liquid-injected motors, are usually built into the motor and installed on both sides of the rotor. Due to their high power density and high-speed performance output characteristics, under working conditions without cooling, the bearing temperature of the high-speed motor will rise sharply in a short period of time. In order to enhance the heat dissipation of the bearings and increase the service life of the bearings, the bearings are cooled along with the rotor components by immersing them in the liquid medium circulating inside the motor. For some liquid media that are easily decomposed by heat, there is a great safety hazard if the bearing temperature rise is too large. In severe cases, it will cause the entire power system to explode and decompose. In addition, due to the special and complex built-in integrated structure of the high-speed permanent magnet liquid-injected motor, the measurement of the bearing temperature rise is brought greater obstacles. Therefore, it is particularly important to accurately measure the bearing temperature rise when the high-speed permanent magnet liquid-injected motor is working. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a testing device for the temperature rise of the bearings of a high-speed permanent magnet liquid-inlet motor. The testing device for the temperature rise of the bearings of a high-speed permanent magnet liquid-inlet motor accurately measures the temperature rise of the bearings of a high-speed permanent magnet liquid-inlet motor by simulating the actual working conditions of the motor bearings without destroying the structure of the high-speed permanent magnet liquid-inlet motor.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a testing device for the temperature rise of the bearings of a high-speed permanent magnet liquid-inlet motor, comprising a high-speed permanent magnet liquid-inlet motor; a bearing to be tested is installed on the bearing box of the high-speed permanent magnet liquid-inlet motor, and the bearing box of the high-speed permanent magnet liquid-inlet motor is provided with an inlet liquid outlet and a blind hole for burying a thermal resistor temperature sensor; a gap exists between the blind hole and the bearing to be tested installed in the bearing box; under normal working conditions, the inlet liquid enters the bearing cover through the inlet liquid inlet, and is divided into two flows at the extended end of the high-speed permanent magnet liquid-inlet motor shaft, one branch liquid flows through the center hole of the high-speed permanent magnet liquid-inlet motor shaft, the air gap between the stator and the rotor, and finally flows to the inlet liquid outlet of the bearing box, and the other branch liquid flows directly through the bearing to be tested to the inlet liquid outlet of the bearing box, and the two branch liquids converge and flow out from the inlet liquid outlet of the bearing box, and then the resistance value of the thermal resistor temperature sensor is measured by a multimeter, and the corresponding temperature is obtained through the relationship between the resistance and temperature change.

[0006] The blind hole is 1 to 2 mm away from the outer circumferential surface of the outer ring of the bearing to be measured.

[0007] The rotor shaft extension end is extended, and a bearing stop installation position is reserved on the shaft extension end. The bearing to be tested is assembled between the bearing stop and the bearing box through an external installation method.

[0008] By changing the outer diameter of the bearing stop and the inner diameter of the hole on the bearing box where the bearing is installed, the temperature rise test of bearings of different sizes can be achieved.

[0009] By changing the type of influent liquid, the bearing temperature rise test of the same tested bearing under different influent media can be achieved.

[0010] By adjusting the flow parameters of the liquid inlet, the bearing temperature rise test of the high-speed permanent magnet liquid-inlet motor bearing under different liquid inlet working conditions can be achieved.

[0011] The beneficial effects of the present invention are: without destroying the motor structure, it is conducive to obtaining the temperature rise data of high-speed permanent magnet liquid-intake motor bearings when working in various aerospace power systems, providing a strong guarantee for the stable operation of the power system; under different liquid inflow media and different working conditions, the temperature rise data of the bearings can be accurately measured in real time, and the test data provides a real and reliable reference basis for the application selection of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] In the figure: 1- high-speed permanent magnet liquid-inlet motor, 2- bearing box, 3- liquid inlet outlet, 4- Pt1000 thermal resistor temperature sensor, 5- multimeter, 6- measured bearing, 7- bearing cover, 8- liquid inlet. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0015] Example 1

[0016] like Figure 1The device shown is a test device for the temperature rise of the bearing of a high-speed permanent magnet liquid-intake motor, comprising a high-speed permanent magnet liquid-intake motor 1; a bearing to be tested 6 is installed on the bearing box 2 of the high-speed permanent magnet liquid-intake motor 1, and a liquid inlet liquid outlet 3 and a blind hole for burying a thermal resistor temperature sensor 4 are provided on the bearing box 2 of the high-speed permanent magnet liquid-intake motor 1; there is a gap between the blind hole and the bearing to be tested 6 installed in the bearing box 2; under normal working conditions, the liquid inlet enters the bearing cover 7 through the liquid inlet liquid inlet 8, and is divided into two flows at the extended end of the rotating shaft of the high-speed permanent magnet liquid-intake motor 1. One branch of liquid flows through the center hole of the rotating shaft of the high-speed permanent magnet liquid-intake motor 1, the air gap between the stator and the rotor, and finally flows to the liquid inlet liquid outlet 3 of the bearing box 2; the other branch of liquid flows directly through the bearing to be tested 6 to the liquid inlet liquid outlet 3 of the bearing box 2. After the two branches of liquid converge, they flow out from the liquid inlet liquid outlet 3 of the bearing box 2, and then the resistance value of the thermal resistor temperature sensor 4 is measured by the multimeter 5, and the corresponding temperature is obtained through the relationship between the resistance and temperature change.

[0017] The blind hole is 1 to 2 mm away from the outer circumferential surface of the outer ring of the tested bearing 6 .

[0018] The rotor shaft extension end is extended, and a bearing stop installation position is reserved on the shaft extension end. The tested bearing 6 is assembled between the bearing stop and the bearing box 2 in an external installation manner.

[0019] By changing the outer diameter of the bearing stop and the inner diameter of the hole for mounting the bearing on the bearing box 2, temperature rise tests on bearings of different sizes can be achieved.

[0020] By changing the type of the influent liquid, the bearing temperature rise test of the same tested bearing 6 under different influent media can be achieved.

[0021] By adjusting the flow parameters of the liquid inlet 8, the bearing temperature rise test of the high-speed permanent magnet liquid-inlet motor 1 under different liquid-inlet working conditions can be achieved.

[0022] Example 2

[0023] Adopt the scheme of embodiment 1, and:

[0024] The bearing cover 7 is provided with a liquid inlet, the bearing box 2 is provided with a liquid inlet outlet 3 and a blind hole for burying a Pt1000 thermal resistor temperature sensor 4. In order to accurately measure the temperature rise of the measured bearing 6 and avoid liquid leakage, the bottom of the blind hole is usually 1mm to 2mm away from the outer cylindrical surface of the outer ring of the measured bearing 6. Under normal working conditions, the high-speed permanent magnet liquid-inlet motor 1 enters the bearing cover 7 through the liquid inlet inlet 8, and flows in two ways at the extended end of the shaft of the high-speed permanent magnet liquid-inlet motor 1. One branch of liquid flows through the center hole of the shaft of the high-speed permanent magnet liquid-inlet motor 1, the air gap between the stator and rotor of the motor, and finally flows to the liquid inlet outlet 3 on the bearing box 2. The other branch of liquid flows directly through the measured bearing 6 to the liquid inlet outlet 3 on the bearing box 2. After the two branches of liquid gather, they flow out from the liquid inlet outlet 3 on the bearing box 2. The liquid flow direction is as follows Figure 1 As shown in the direction of the middle arrow, after the high-speed permanent magnet liquid-inlet motor 1 enters a stable working state, the resistance value between the two lines of the Pt1000 thermal resistor temperature sensor 4 is measured using the resistance range of the multimeter 5, and the resistance value is converted into a corresponding temperature value according to the relationship between the resistance value and the temperature.

[0025] Example 3

[0026] Adopt the scheme of embodiment 1, and:

[0027] The rotor shaft extension end is extended, and a bearing block installation position is reserved on the shaft extension end. The tested bearing 6 inside the motor is assembled between the bearing block and the bearing box 2 through an external installation method. The bearing cover 7 is used for axial limitation and sealing of the tested bearing 6. The bearing cover 7 is provided with a liquid inlet 8, and the bearing box 2 is provided with a liquid inlet outlet 3. By changing the outer diameter of the bearing block and the inner diameter of the hole for mounting the bearing on the bearing box 2, bearing temperature rise tests of different sizes can be achieved.

[0028] Example 4

[0029] Adopt the scheme of embodiment 1, and:

[0030] By changing the type of the influent liquid, the bearing temperature rise test of the same test bearing 6 under different influent media can be achieved.

[0031] Example 5

[0032] Adopt the scheme of embodiment 1, and:

[0033] By adjusting the flow parameters of the liquid inlet 8 on the bearing cover 7, such as the liquid pressure and flow parameters, the bearing temperature rise test of the high-speed permanent magnet liquid-inlet motor 1 under different liquid inlet working conditions can be achieved.

[0034] To sum up, the present invention extends the rotor shaft extension end, and reserves a bearing block installation position on the shaft extension end. The tested bearing inside the motor is assembled between the bearing block and the bearing box through an external installation method. The bearing cover is used for axial limitation and sealing of the tested bearing. The bearing cover is provided with a liquid inlet, and the bearing box is provided with a liquid inlet outlet. By changing the outer diameter of the bearing block and the inner diameter of the hole for mounting the bearing on the bearing box, bearing temperature rise tests of different sizes can be realized; by changing the type of liquid inlet, bearing temperature rise tests of the same bearing under different liquid inlet media can be realized; by adjusting the liquid flow rate at the inlet on the bearing cover, bearing temperature rise tests of high-speed permanent magnet liquid inlet motor bearings under different liquid inlet working conditions can be realized.

Claims

1. A device for testing the temperature rise of a high-speed permanent magnet liquid-intake motor bearing, comprising a high-speed permanent magnet liquid-intake motor (1), characterized in that: A bearing to be tested (6) is mounted on the bearing box (2) of the high-speed permanent magnet liquid-inlet motor (1), and a liquid inlet outlet (3) and a blind hole for burying a thermal resistor temperature sensor (4) are provided on the bearing box (2) of the high-speed permanent magnet liquid-inlet motor (1); a gap exists between the blind hole and the bearing to be tested (6) mounted in the bearing box (2), and the blind hole is 1 to 2 mm away from the outer circumferential surface of the outer ring of the bearing to be tested (6); Under normal operating conditions, the inlet liquid enters the bearing cover (7) through the inlet liquid inlet (8) and flows in two ways at the extended end of the rotating shaft of the high-speed permanent magnet inlet liquid motor (1). The liquid in one branch flows through the central hole of the rotating shaft of the high-speed permanent magnet inlet liquid motor (1), the air gap between the stator and the rotor, and finally flows to the inlet liquid outlet (3) of the bearing box (2). The liquid in the other branch flows directly through the measured bearing (6) to the inlet liquid outlet (3) of the bearing box (2). After the two branch liquids converge, they flow out from the inlet liquid outlet (3) of the bearing box (2). Then, the resistance value of the thermal resistor temperature sensor (4) is measured by a multimeter (5), and the corresponding temperature is obtained through the relationship between the resistance and the temperature.

2. The device for testing the temperature rise of the bearing of a high-speed permanent magnet liquid-intake motor according to claim 1, characterized in that: The rotor shaft extension end is extended, and a bearing stop installation position is reserved on the shaft extension end. The bearing to be tested (6) is assembled between the bearing stop and the bearing box (2) in an external installation manner.

3. The device for testing the temperature rise of the bearing of a high-speed permanent magnet liquid-intake motor according to claim 1, characterized in that: By changing the outer diameter of the bearing stop and the inner diameter of the hole on the bearing box (2) for mounting the bearing, temperature rise tests on bearings of different sizes and specifications can be achieved.

4. The device for testing the temperature rise of the bearing of a high-speed permanent magnet liquid-intake motor according to claim 1, characterized in that: By changing the type of the influent liquid, the bearing temperature rise test of the same tested bearing (6) under different influent media is achieved.

5. The device for testing the temperature rise of the bearings of a high-speed permanent magnet liquid-intake motor according to claim 1, characterized in that: By adjusting the flow parameters of the liquid inlet (8), a bearing temperature rise test of a high-speed permanent magnet liquid-inlet motor (1) bearing under different liquid-inlet working conditions is achieved.

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