Cooling test system of new energy motor

Abstract

The utility model discloses a cooling test system of a new energy motor, which is provided with a gearbox connected with a motor to be tested in series, a refrigerating unit connected with the gearbox in parallel and a heat exchanger, and a refrigerating medium of the refrigerating unit performs cooling and heat exchange in lubricating oil of the gearbox in the heat exchanger. An oil supply path is arranged between the output end of the gearbox and the input end of the motor, a first magnetic pump and a first flowmeter are arranged on the oil supply path, two paths, namely an oil return path and an oil pumping path, are connected in parallel between the output end of the motor and the input end of the gearbox, and a third pneumatic valve is arranged on the oil return path; and a second magnetic pump, a second flowmeter and an oil return tank are arranged on the oil pumping path. An oil pumping way is added on the basis of an existing cooling circulation line, and a magnetic pump for pumping oil is correspondingly arranged, so that redundant lubricating oil in the motor can be pumped away, and burnout of a coil of the motor and even temperature rise and demagnetization of the motor are avoided.

Description

Technical Field

[0001] The utility model relates to the field of motor cooling equipment, in particular to a cooling test system for a new energy motor. Background Art

[0002] With the improvement of the quality requirements for industrial products, it is required that the products produced should be subjected to simulation tests before being put on the market, and the tests should be able to completely and truly simulate the real situation of the products during use. For the refrigeration simulation test of a new energy motor, the motor can be placed in an environmental test chamber and its refrigeration environment can be simulated, or the cooling test system can be directly connected to the new energy motor to provide a refrigeration environment for it.

[0003] The existing cooling test system for a new energy motor uses the lubricating oil of the gearbox as a heat exchange medium. A cooling circulation line is connected between the gearbox and the motor, and a cooling circulation pump is adopted. Thus, the lubricating oil in the gearbox can be pumped into the motor for cooling, and the lubricating oil after heat exchange flows back to the gearbox again. However, the new energy motor has the characteristic that the internal lubricating oil cannot be full. Being full of liquid will cause the resistance of the motor to increase. When the motor rotates at a high speed, the temperature of the coil rises, resulting in the motor heating up and demagnetizing or burning out the coil. There is no oil pumping line between the gearbox and the motor in the existing cooling test system for a new energy motor. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages that the lubricating oil in the motor is full of liquid and will burn out the coil or demagnetize the motor in the existing cooling test system for a new energy motor, the applicant provides a cooling test system for a new energy motor with a reasonable structure. On the basis of the existing one cooling circulation line, an oil pumping line is added and a magnetic pump for pumping oil is correspondingly arranged, so that the redundant lubricating oil inside the motor can be pumped away, avoiding the coil of the motor from being burned out and even the motor from heating up and demagnetizing.

[0005] The technical solution adopted by the utility model and the achieved beneficial effects are as follows:

[0006] A cooling test system for a new energy motor includes a gearbox connected in series with the motor to be tested, a refrigeration unit and a heat exchanger connected in parallel with the gearbox. The refrigeration medium of the refrigeration unit cools and exchanges heat with the lubricating oil of the gearbox in the heat exchanger. There is an oil supply line between the output end of the gearbox and the input end of the motor. A first magnetic pump and a first flow meter are arranged on the oil supply line. Two lines are connected in parallel between the output end of the motor and the input end of the gearbox, namely an oil return line and an oil pumping line. A third pneumatic valve is arranged on the oil return line. A second magnetic pump, a second flow meter and an oil return oil tank are arranged on the oil pumping line. The low-temperature lubricating oil in the gearbox flows into the motor along the oil supply line for heat exchange, and then returns to the gearbox through the oil return line or the oil pumping line to complete the cooling cycle of the motor.

[0007] A double magnetic pump is used between the gearbox and the motor, and an oil extraction circuit is connected in parallel on the basis of the original oil return circuit. Specifically, a first magnetic pump is arranged on the oil supply circuit, and a second magnetic pump is arranged on the oil extraction circuit. When the value displayed by the second flowmeter on the oil extraction circuit is greater than the value displayed by the first flowmeter on the oil supply circuit, it is regarded that the lubricating oil level inside the motor is not full, and the excess lubricating oil inside the motor can be pumped away to avoid burning out the motor coil or even demagnetizing the motor due to temperature rise.

[0008] As a further improvement of the above technical solution:

[0009] The oil supply circuit also has a proportional relief valve, a first pneumatic valve, a first pressure sensor, a first temperature sensor, and a first filter.

[0010] The first pressure sensor detects and transmits the pressure signal of the oil supply circuit, and the first temperature sensor detects and transmits the temperature signal of the lubricating oil. After receiving the signals, the PLC controls the opening and closing of the proportional relief valve and the first pneumatic valve to achieve closed-loop control. When the oil supply circuit reaches the set upper limit alarm, the proportional relief valve is opened to control the pressure of the lubricating oil to ensure the stability of the line pressure and prevent damage to the motor.

[0011] The oil return circuit also has a second filter and a second temperature sensor.

[0012] After the test is completed and before the motor is removed, opening the third pneumatic valve can drain the lubricating oil inside the motor into the gearbox to reduce waste.

[0013] The oil extraction circuit also has a second pneumatic valve. The output end of the second pneumatic valve is connected to the input end of the second magnetic pump, and the input end of the second pneumatic valve is connected between the second temperature sensor and the third pneumatic valve on the oil return circuit.

[0014] The oil extraction circuit and the oil return circuit share the same second filter and second temperature sensor, and the switching between the oil return circuit and the oil extraction circuit is realized by opening and closing the second pneumatic valve or the third pneumatic valve.

[0015] The oil return tank is connected to the third filter, and the gearbox is connected to the exhaust valve.

[0016] Opening the third filter can discharge the gas in the oil return tank, and opening the exhaust valve can discharge the gas in the gearbox to achieve pressure balance.

[0017] An oil cooling circuit is arranged between the gearbox and the heat exchanger. The oil cooling circuit of the gearbox is sequentially connected in series with a third magnetic pump, a heat exchanger, and a heater.

[0018] The third magnetic pump pumps the high-temperature lubricating oil in the gearbox to the heat exchanger to exchange heat with the low-temperature refrigerant provided by the refrigeration unit. The low-temperature lubricating oil after heat exchange then returns to the gearbox. If it is necessary to raise the temperature of the lubricating oil, the heater is turned on. Description of the Drawings

[0019] Figure 1 This is a schematic structural diagram of the present utility model.

[0020] In the figure: 1, transmission; 2, motor; 3, first magnetic pump; 4, proportional overflow valve; 5, first flowmeter; 6, first pneumatic valve; 7, first pressure sensor; 8, first temperature sensor; 9, first filter; 10, second filter; 11, second temperature sensor; 12, second pneumatic valve; 13, second magnetic pump; 14, second flowmeter; 15, oil return tank; 16, third filter; 17, exhaust valve; 18, third pneumatic valve; 19, refrigeration unit; 20, third magnetic pump; 21, heat exchanger; 22, heater. Specific embodiments

[0021] The following will describe the specific embodiments of the present utility model with reference to the accompanying drawings.

[0022] As Figure 1 shown, the cooling test system of the new energy motor of the present utility model has a transmission 1 connected in series with the motor 2 to be tested, a refrigeration unit 19 and a heat exchanger 21 connected in parallel with the transmission 1. There is an oil supply line between the output end of the transmission 1 and the input end of the motor 2. Two lines are connected in parallel between the output end of the motor 2 and the input end of the transmission 1, namely an oil return line and an oil extraction line. The transmission 1 inputs low-temperature lubricating oil to the motor 2 to achieve cooling and refrigeration inside the motor 2. The lubricating oil after heat exchange returns to the transmission 1 through the oil return line or the oil extraction line to complete the cooling cycle of the motor 2. The oil supply line is provided with a first magnetic pump 3, a proportional overflow valve 4, a first flowmeter 5, a first pneumatic valve 6, a first pressure sensor 7, a first temperature sensor 8 and a first filter 9 connected in series. The oil return line is provided with a second filter 10, a second temperature sensor 11 and a third pneumatic valve 18 connected in series. The oil extraction line is provided with a second pneumatic valve 12, a second magnetic pump 13, a second flowmeter 14 and an oil return tank 15 connected in series. The input end of the second pneumatic valve 12 is connected between the second temperature sensor 11 and the third pneumatic valve 18 on the oil return line.

[0023] The transmission 1 is connected in parallel with the refrigeration unit 19. The refrigeration unit 19 can cool the lubricating oil in the transmission 1. The heat exchange between the two is realized in the middle heat exchanger 21 of the parallel connection. The refrigeration unit 19 is connected in series with the heat exchanger 21. The refrigeration unit 19 inputs low-temperature refrigerant into the heat exchanger 21, and the refrigerant after heat exchange returns to the refrigeration unit 19 again, thus forming a circulating heat exchange path. Between the transmission 1 and the heat exchanger 21 is a circulating oil cooling path. On the oil cooling path of the transmission 1, a third magnetic pump 20, a heat exchanger 21, and a heater 22 are connected in series in sequence. The third magnetic pump 20 pumps the high-temperature lubricating oil in the transmission 1 into the heat exchanger 21 to exchange heat with the low-temperature refrigerant provided by the refrigeration unit 19, and the low-temperature lubricating oil after heat exchange returns to the transmission 1 again. If it is necessary to raise the temperature of the lubricating oil, the heater 22 is turned on.

[0024] When the system of the present utility model is working, the staff can set the target temperature and target flow rate of the lubricating oil on the touch screen of the environmental test chamber. When the motor 2 needs a low-temperature environment, the third magnetic pump 20 is turned on. The refrigeration unit 19 is used to cool the lubricating oil of the transmission 1. When the oil temperature of the lubricating oil reaches the target temperature, the first magnetic pump 3 is turned on. The first magnetic pump 3 pumps out the low-temperature lubricating oil from the transmission 1. The low-temperature lubricating oil flows along the oil supply path to the motor 2 and cools the motor 2. The frequency converter controls the rotation speed of the first magnetic pump 3 to control the flow rate of the lubricating oil on the oil supply path. The first flow meter 5 detects and transmits the flow signal of the lubricating oil, the first pressure sensor 7 detects and transmits the pressure signal of the oil supply path, and the first temperature sensor 8 detects and transmits the temperature signal of the lubricating oil. After receiving the signals, the PLC controls the opening and closing of the proportional relief valve 4 and the first pneumatic valve 6. When the oil supply path reaches the set upper limit alarm, the proportional relief valve 4 is turned on to control the pressure of the lubricating oil, ensuring the stability of the line pressure and preventing the damage of the motor 2.

[0025] After the first magnetic pump 3 is turned on, the second magnetic pump 13 on the oil extraction path is turned on at the same time. The second magnetic pump 13 extracts the excess lubricating oil inside the motor 2, avoiding the full liquid of the lubricating oil in the motor 2. When the motor 2 rotates at a high speed, the coil temperature rises and the coil or even the motor 2 heats up and demagnetizes. The second flow meter 14 detects and transmits the flow signal of the lubricating oil on the oil extraction path. When the flow rate of the oil extraction path is greater than that of the oil supply path, it can be considered that the oil level of the lubricating oil inside the motor 2 is lower than the upper limit value and is not full. The lubricating oil extracted from the motor 2 flows into the oil return tank 15 along the oil return path. After the test is completed and before the motor 2 is removed, the third filter 16 is opened to discharge the gas in the oil return tank 15, the exhaust valve 17 is opened to discharge the gas in the transmission 1, and then the third pneumatic valve 18 is opened to discharge the lubricating oil inside the motor 2 into the transmission 1, reducing waste.

[0026] The above description is an explanation of the present utility model, not a limitation of the utility model. Without violating the spirit of the present utility model, the present utility model can be modified in any form.

Claims

1. A cooling test system for a new energy motor, comprising a gearbox (1) connected in series with a motor (2) to be tested, a refrigeration unit (19) and a heat exchanger (21) connected in parallel with the gearbox (1), wherein the refrigerant of the refrigeration unit (19) cools and exchanges heat with the lubricating oil of the gearbox (1) in the heat exchanger (21), an oil supply path is provided between the output end of the gearbox (1) and the input end of the motor (2), a first magnetic pump (3) and a first flow meter (5) are provided on the oil supply path, and the system is characterized in that: Two lines are connected in parallel between the output end of the motor (2) and the input end of the gearbox (1), namely an oil return line and an oil extraction line. A third pneumatic valve (18) is provided on the oil return line, and a second magnetic pump (13), a second flow meter (14) and an oil return tank (15) are provided on the oil extraction line. The low-temperature lubricating oil in the gearbox (1) flows into the motor (2) along the oil supply line for heat exchange, and then returns to the gearbox (1) through the oil return line or the oil extraction line, thereby completing the cooling cycle of the motor (2).

2. The cooling test system for the new energy motor according to claim 1, characterized in that: The oil supply line also has a proportional overflow valve (4), a first pneumatic valve (6), a first pressure sensor (7), a first temperature sensor (8) and a first filter (9).

3. The cooling test system for the new energy motor according to claim 1, characterized in that: The oil return line is also provided with a second filter (10) and a second temperature sensor (11).

4. The cooling test system for the new energy motor according to claim 3 is characterized in that: The oil extraction line also has a second pneumatic valve (12), the output end of the second pneumatic valve (12) is connected to the input end of the second magnetic pump (13), and the input end of the second pneumatic valve (12) is connected between the second temperature sensor (11) and the third pneumatic valve (18) on the oil return line.

5. The cooling test system for the new energy motor according to claim 1, characterized in that: The oil return tank (15) is connected to the third filter (16), and the gearbox (1) is connected to the exhaust valve (17).

6. The cooling test system for the new energy motor according to claim 1, characterized in that: An oil cooling circuit is provided between the gearbox (1) and the heat exchanger (21), and the third magnetic pump (20), the heat exchanger (21), and the heater (22) are sequentially connected in series on the oil cooling circuit of the gearbox (1).

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