Chiller for testing electric motors of new energy vehicles

Abstract

This utility model relates to a chiller for testing motors in new energy vehicles. The chiller includes a water tank and a refrigeration system. The refrigeration system has an inlet pipe and an outlet pipe, the ends of which are located inside the water tank. The refrigeration system is configured to draw water from the water tank through the inlet pipe and cool it, then return the cooled water to the water tank through the outlet pipe. The chiller also includes a test motor inlet, a companion motor inlet, a test motor return outlet, and a companion motor return outlet. A first circulation pump pumps cooling water to the test motor, and a second circulation pump pumps cooling water to the companion motor. The frequency of the variable frequency water pump motor is controlled based on the flow rate detected by the flow meter, thus controlling the pumped water flow rate until a set flow rate is reached. The chiller in this embodiment can meet the cooling requirements of both the test motor and the companion motor, and can adjust the cooling water delivery rate according to different speeds and heat generation.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a chiller for testing motors of new energy vehicles. Background Technology

[0002] Electric motors are the power source for new energy vehicles. During the production process of new energy vehicles, it is necessary to test their performance parameters, such as efficiency, torque, and speed. Simultaneously, a test motor is needed to simulate the operation of the four wheels of a new energy vehicle. To ensure smooth testing, cooling water needs to be provided to both the test motor and the test motor. This necessitates the design of a chiller specifically for testing new energy vehicle motors to meet these testing requirements.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a chiller for testing motors in new energy vehicles, in order to meet various needs during the testing of motors in new energy vehicles.

[0005] The technical solution adopted in this utility model is as follows: A chiller for testing motors of new energy vehicles includes a water tank and a refrigeration system. The refrigeration system has an inlet pipe and an outlet pipe, the ends of which are located inside the water tank. The refrigeration system is configured to draw water from the water tank through the inlet pipe and cool it down, then return the cooled water to the water tank through the outlet pipe. The chiller also includes a test motor inlet, a companion motor inlet, a test motor return outlet, and a companion motor return outlet. Each of these inlets is connected to the water tank via its own pipe. A first circulation pump (a variable frequency pump) is installed on the pipe connected to the test motor inlet. A second circulation pump is installed on the pipe connected to the companion motor inlet, and a flow meter is installed on the pipe connected to the test motor return outlet.

[0006] A further technical solution is that the chiller for testing the new energy vehicle motor also includes an electrical cabinet, which is electrically connected to the first circulating pump, the second circulating pump and the flow meter respectively. The electrical cabinet has an electrical cabinet inlet and an electrical cabinet outlet. The electrical cabinet inlet is connected in parallel with the inlet of the test motor through a pipe, and the electrical cabinet outlet is connected in parallel with the outlet of the test motor through a pipe.

[0007] A further technical solution is that a temperature probe and a heating element are also installed inside the water tank, and the temperature probe and the heating element are electrically connected to the electrical cabinet respectively.

[0008] A further technical solution is that a level switch is installed inside the water tank, and the water tank is also connected to an automatic water supply port via a pipe. A solenoid valve is also installed on the pipe connected to the automatic water supply port. The level switch and the solenoid valve are respectively electrically connected to the electrical cabinet.

[0009] A further technical solution is that the water tank is also connected to an air return port via a pipe.

[0010] A further technical solution is that a vent pipe is also installed inside the water tank, and the water tank is also connected to a drain outlet via a pipe.

[0011] A further technical solution is that the refrigeration system includes an evaporator, a water circuit, and a cooling medium circuit; the water circuit is an open circuit, including an inlet pipe, an evaporator water side, and an outlet pipe connected in sequence, with a third circulation pump installed on the inlet pipe and a flow switch installed on the outlet pipe; the cooling medium circuit is a closed circuit, including a compressor, a condenser, an expansion valve, and an evaporator cooling medium side connected in sequence through pipes, with the flow switch, compressor, condenser, and expansion valve electrically connected to the electrical cabinet respectively.

[0012] A further technical solution is that the refrigeration system includes: a low-pressure regulator, disposed on the pipeline between the evaporator cooling medium side and the compressor; a high-pressure regulator, disposed on the pipeline between the compressor and the condenser; a condensing regulator, disposed on the pipeline between the high-pressure regulator and the condenser; and a dryer filter, disposed on the pipeline between the condenser and the expansion valve.

[0013] A further technical solution is that the refrigeration system includes: a first liquid charging valve, which is disposed on the pipeline between the low-pressure controller and the compressor; and a second liquid charging valve, which is disposed on the pipeline between the condenser and the dryer filter.

[0014] The beneficial effects of this utility model embodiment are as follows: (I) The chiller for testing new energy vehicle motors according to this embodiment of the invention pumps cooling water to the test motor via a first circulating pump and to the auxiliary test motor via a second circulating pump. The flow rate detected by the flow meter is compared with a set flow rate. When the actual flow rate is greater than the set flow rate, the frequency of the variable frequency water pump motor is reduced, thus reducing the pumped water flow rate until the set flow rate is reached. When the actual flow rate is less than the set flow rate, the frequency of the variable frequency water pump motor is increased, thus increasing the pumped water flow rate until the set flow rate is reached. The chiller of this embodiment can meet the cooling needs of both the test motor and the auxiliary test motor, and can adjust the cooling water delivery rate according to different speeds and heat generation.

[0015] (ii) Furthermore, the electrical cabinet receives the water temperature detected by the temperature probe. When the water temperature is higher than the set water temperature and the set temperature difference, the electrical cabinet controls the compressor, condenser and third circulation pump to work, as well as controls the opening of the expansion valve and flow switch, until the water temperature reaches the set water temperature and stops working, so as to ensure that the water temperature in the water tank is always near the set water temperature and that the test can be carried out normally. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the chiller for testing new energy vehicle motors according to this utility model.

[0017] Figure 2 This is a connection diagram of the chiller for testing the motor of a new energy vehicle according to this utility model.

[0018] In the picture: 1. Water tank; 11. Solenoid valve; 12. Automatic water inlet; 13. Drain outlet; 14. Liquid level switch; 15. Vent pipe; 16. Temperature probe; 17. Heating element; 18. Air return outlet; 21. Test motor inlet; 22. First circulation pump; 23. Accompanying motor inlet; 24. Second circulation pump; 25. Test motor return outlet; 26. Flow meter; 27. Accompanying motor return outlet; 3. Electrical cabinet; 31. Electrical cabinet inlet; 32. Electrical cabinet return outlet; 4. Evaporator; 5. Compressor; 51. Low-pressure regulator; 52. High-pressure regulator; 6. Condenser; 61. Condenser regulator; 7. Expansion valve; 8. Dryer filter; 91. First liquid filling valve; 92. Second liquid filling valve; 101. Inlet pipe; 102. Third circulation pump; 103. Outlet pipe; 104. Flow switch. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] First embodiment: This embodiment discloses a chiller for testing motors in new energy vehicles.

[0021] like Figure 1 As shown, the chiller for testing new energy vehicle motors includes a water tank 1 and a refrigeration system.

[0022] The refrigeration system has an inlet pipe 101 and an outlet pipe 103, the ends of which are located inside a water tank 1. The refrigeration system is configured to draw water from the water tank 1 through the inlet pipe 101 and cool it down, and then return the cooled water to the water tank 1 through the outlet pipe 103. A commercially available heat exchanger can be used in the refrigeration system.

[0023] The chiller for testing new energy vehicle motors also includes a test motor inlet 21, a companion motor inlet 23, a test motor return outlet 25, and a companion motor return outlet 27. The test motor inlet 21, companion motor inlet 23, test motor return outlet 25, and companion motor return outlet 27 are each connected to a water tank 1 through their respective pipes. A first circulation pump 22, which is a variable frequency circulation pump, is installed on the pipe connected to the test motor inlet 21. A second circulation pump 24 is installed on the pipe connected to the companion motor inlet 23, and a flow meter 26 is installed on the pipe connected to the test motor return outlet 25.

[0024] like Figure 1 and Figure 2 As shown, the chiller for testing new energy vehicle motors further includes an electrical cabinet 3. The electrical cabinet 3 is electrically connected to the first circulating pump 22, the second circulating pump 24, and the flow meter 26. The electrical cabinet 3 has an inlet 31 and an outlet 32. The inlet 31 is connected in parallel with the inlet 23 of the test motor via a pipe, and the outlet 32 ​​is connected in parallel with the outlet 27 of the test motor via a pipe. For example, the electrical cabinet 3 can use a commercially available PLC control cabinet, and the control program is existing technology. The electrical cabinet 3 receives the flow rate value detected by the flow meter 26 and controls the speed of the first circulating pump 22 and the start / stop of the second circulating pump 24. Cooling water is pumped to the electrical cabinet 3 by the second circulating pump 24 to cool the equipment inside the electrical cabinet 3.

[0025] like Figure 1 and Figure 2 As shown, the water tank 1 is further equipped with a temperature probe 16 and a heating element 17, which are electrically connected to the electrical cabinet 3. When the ambient temperature is low, the water temperature is very low when the chiller is first turned on. The electrical cabinet 3 receives the temperature detected by the low temperature probe and controls the heating element 17 to heat the water to the set temperature value, so as to facilitate early testing.

[0026] like Figure 1 and Figure 2As shown, a level switch 14 is further installed inside the water tank 1. The water tank 1 is also connected to an automatic water inlet 12 via a pipe. A solenoid valve 11 is also installed on the pipe connecting to the automatic water inlet 12. The level switch 14 and the solenoid valve 11 are electrically connected to the electrical cabinet 3. The electrical cabinet 3 receives the water level detected by the level switch 14 and controls the opening and closing of the solenoid valve 11. When the level switch 14 detects that the water level is too low, the electrical cabinet 3 controls the solenoid valve 11 to open, and external circulating water automatically enters the water tank 1 until the water level detected by the level switch 14 reaches the upper level.

[0027] like Figure 1 As shown, the water tank 1 is further connected to the air return port 18 via a pipe. When a single motor test is completed, the residual water in the test motor needs to be blown back to the water tank 1. At this time, one of the interfaces of the test motor can be connected to the air return port 18, and the residual water can be blown back to the water tank 1 from the other interface using compressed air of about 2 bar.

[0028] like Figure 1 As shown, a vent pipe 15 is further installed inside the water tank 1, and the water tank 1 is also connected to the drain outlet 13 via a pipe. When compressed air is used to blow water, the compressed air can flow out from the vent pipe 15 to prevent the air pressure inside the water tank 1 from rising and squeezing out water.

[0029] In this embodiment, cooling water is pumped to the test motor via the first circulating pump 22 and to the auxiliary test motor via the second circulating pump 24. The electrical cabinet 3 compares the flow rate detected by the flow meter 26 with the set flow rate. When the actual flow rate is greater than the set flow rate, the electrical cabinet 3 reduces the frequency of the variable frequency water pump motor, thus reducing the pumped water flow rate, until the set flow rate is reached. When the actual flow rate is less than the set flow rate, the electrical cabinet 3 increases the frequency of the variable frequency water pump motor, thus increasing the pumped water flow rate, until the set flow rate is reached. The chiller in this embodiment can meet the cooling requirements of both the test motor and the auxiliary test motor, and can adjust the cooling water delivery rate according to different speeds and heat generation.

[0030] Second embodiment: Based on the first embodiment, the second embodiment further optimizes and refines the refrigeration system of the first embodiment.

[0031] like Figure 1 and Figure 2As shown, the refrigeration system includes an evaporator 4, a water circuit, and a cooling medium circuit. The water circuit is an open circuit, including an inlet pipe 101, the water side of the evaporator 4, and an outlet pipe 103 connected in sequence. A third circulation pump 102 is installed on the inlet pipe 101, and a flow switch 104 is installed on the outlet pipe 103. The cooling medium circuit is a closed circuit, including a compressor 5, a condenser 6, an expansion valve 7, and the cooling medium side of the evaporator 4 connected in sequence via pipes. The condenser 6 is a fan-type condenser. The third circulation pump 102, the flow switch 104, the compressor 5, the condenser 6, and the expansion valve 7 are all electrically connected to the electrical cabinet 3.

[0032] like Figure 1 As shown, the refrigeration system further includes a low-pressure controller 51, a high-pressure controller 52, a condensing controller 61, and a dryer filter 8. The low-pressure controller 51 is located on the pipe between the evaporator 4 (cooling medium side) and the compressor 5. When the low-pressure controller 51 detects that the pressure in the pipe is lower than a set value, it automatically cuts off the power to the compressor 5. The high-pressure controller 52 is located on the pipe between the compressor 5 and the condenser 6. When the high-pressure controller 52 detects that the pressure in the pipe is higher than a set value, it automatically cuts off the power to the compressor 5 to protect it and extend its service life. The condensing controller 61 is located on the pipe between the high-pressure controller 52 and the condenser 6. It controls the speed of the fan in the condenser 6 to prevent overheating of the compressor 5 or system failure due to excessive condensing pressure, thereby balancing heat dissipation efficiency and refrigeration reliability. The dryer filter 8 is installed on the pipeline between the condenser 6 and the expansion valve 7 to absorb moisture in the cooling medium, preventing moisture from freezing in the pipeline and corroding components in the system.

[0033] like Figure 1 As shown, the refrigeration system further includes a first charging valve 91 and a second charging valve 92. The first charging valve 91 is located on the pipeline between the low-pressure controller 51 and the compressor 5. The second charging valve 92 is located on the pipeline between the condenser 6 and the dryer filter 8, and the first charging valve 91 and the second charging valve 92 replenish the cooling medium in the cooling medium circuit.

[0034] In this embodiment, the electrical cabinet 3 receives the water temperature detected by the temperature probe 16. When the water temperature is higher than the set water temperature and the set temperature difference, the electrical cabinet 3 controls the compressor 5, condenser 6 and the third circulation pump 102 to work, and controls the opening of the expansion valve 7 and the flow switch 104 until the water temperature reaches the set water temperature and stops working, so as to ensure that the water temperature in the water tank 1 is always near the set water temperature and that the test can be carried out normally.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A chiller for testing motors in new energy vehicles, characterized in that, The chiller for testing new energy vehicle motors includes a water tank and a refrigeration system. The refrigeration system has an inlet pipe and an outlet pipe, the ends of which are located inside the water tank. The refrigeration system is configured to draw water from the water tank through the inlet pipe and cool it down, and then return the cooled water to the water tank through the outlet pipe. The chiller also includes a test motor inlet, a companion motor inlet, a test motor return outlet, and a companion motor return outlet. The test motor inlet, companion motor inlet, test motor return outlet, and companion motor return outlet are each connected to the water tank through their respective pipes. A first circulation pump, which is a variable frequency circulation pump, is installed on the pipe connected to the test motor inlet. A second circulation pump is installed on the pipe connected to the companion motor inlet, and a flow meter is installed on the pipe connected to the test motor return outlet.

2. The chiller for testing new energy vehicle motors according to claim 1, characterized in that: The chiller for testing new energy vehicle motors also includes an electrical cabinet, which is electrically connected to the first circulating pump, the second circulating pump, and the flow meter. The electrical cabinet has an inlet and an outlet. The inlet is connected in parallel with the inlet of the test motor via a pipe, and the outlet is connected in parallel with the outlet of the test motor via a pipe.

3. The chiller for testing new energy vehicle motors according to claim 2, characterized in that: The water tank is also equipped with a temperature probe and a heating element, which are electrically connected to the electrical cabinet.

4. The chiller for testing new energy vehicle motors according to claim 2, characterized in that: The water tank is equipped with a level switch, and the water tank is also connected to an automatic water supply port via a pipe. A solenoid valve is also installed on the pipe connected to the automatic water supply port. The level switch and the solenoid valve are electrically connected to the electrical cabinet respectively.

5. The chiller for testing new energy vehicle motors according to claim 1, characterized in that: The water tank is also connected to an air return port via a pipe.

6. The chiller for testing new energy vehicle motors according to claim 5, characterized in that: The water tank is also equipped with a vent pipe, and the water tank is also connected to a drain outlet via a pipe.

7. The chiller for testing new energy vehicle motors according to claim 2, characterized in that: The refrigeration system includes an evaporator, a water circuit, and a cooling medium circuit. The water circuit is an open circuit, including an inlet pipe, an evaporator water side, and an outlet pipe connected in sequence. A third circulation pump is installed on the inlet pipe, and a flow switch is installed on the outlet pipe. The cooling medium circuit is a closed circuit, including a compressor, a condenser, an expansion valve, and an evaporator cooling medium side connected in sequence through pipes. The flow switch, compressor, condenser, and expansion valve are electrically connected to the electrical cabinet.

8. The chiller for testing new energy vehicle motors according to claim 7, characterized in that: The refrigeration system includes: A low-pressure regulator is installed on the pipeline between the evaporator cooling medium side and the compressor; A high-pressure regulator is installed on the pipeline between the compressor and the condenser; A condensing pressure controller is installed on the pipeline between the high-pressure pressure controller and the condenser; A drying filter is installed on the pipeline between the condenser and the expansion valve.

9. The chiller for testing new energy vehicle motors according to claim 8, characterized in that: The refrigeration system includes: The first liquid filling valve is installed on the pipeline between the low-pressure controller and the compressor; The second liquid filling valve is installed on the pipeline between the condenser and the dryer filter.

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