Integrated water cooling and oil cooling drive motor test bench and control method

Abstract

The application relates to a driving motor test bench integrated with water cooling and oil cooling and a control method, which comprises a compressor circuit, a water-cooled internal circulation circuit and a water-cooled external circulation circuit, wherein the compressor circuit comprises a compressor, an evaporator, an expansion valve and a condenser which are connected in series; the water-cooled internal circulation circuit comprises a constant-temperature solution tank connected with the evaporator, and an internal circulation pump connected between the constant-temperature solution tank and the evaporator; the water-cooled external circulation circuit comprises a first load circulation branch connected with the constant-temperature solution tank, and a first external circulation pump and a first electromagnetic valve connected on the first load circulation branch; and the oil-cooled circulation circuit comprises a heat exchanger connected with the first load circulation branch, a second electromagnetic valve connected between the heat exchanger and the first load circulation branch, and an oil tank and an oil pump connected in series with the heat exchanger. The same set of compressor circuit and water-cooled internal circulation circuit can meet the temperature regulation and control of water cooling and oil cooling, the production and operation cost of the test bench equipment is reduced, and the equipment utilization efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of engine assembly bench testing equipment, and in particular to a test bench and control method for a drive motor that integrates water cooling and oil cooling. Background Technology

[0002] Drive motors have become the "heart" and core driving force of new energy vehicles in the automotive industry. As motor speeds continue to increase, traditional water-cooling methods have become less efficient, making them unsuitable for high-speed, high-torque motors. Currently, oil-cooling is gradually becoming the mainstream method in mid-to-high-end automotive electric drive systems.

[0003] During the development phase, electric drive systems require extensive testing on test benches. However, current motor test benches are typically only equipped with water-cooled temperature control equipment. If oil-cooled motor testing is required, an additional set of oil-cooled temperature control equipment is needed.

[0004] In existing motor bench tests, oil-cooled motors typically use a separate oil-cooling temperature control system. This system mainly uses heaters and heat exchangers to control the oil temperature, and uses bypass valves and micro-flow regulating valves to manually adjust the oil flow rate, thus achieving precise oil-cooling temperature control.

[0005] Existing oil-cooled motor cooling solutions typically require a separate oil-cooling temperature control system. The oil-cooled motor itself requires oil-cooled temperature control, while the motor controller requires water-cooled temperature control. However, when conducting water-cooled motor tests on a motor bench, this entire oil-cooling system must be idle. This undoubtedly increases the cost of motor bench testing and impacts testing efficiency. Consequently, equipment utilization is low, motor bench testing costs increase, and testing efficiency is also affected. Summary of the Invention

[0006] This application provides an integrated water-cooled and oil-cooled drive motor test bench and control method to solve the problem in related technologies where motor test benches are equipped with independent water-cooled and oil-cooled temperature control devices, resulting in low equipment utilization and increased cost of motor test benches.

[0007] The first aspect of this application provides a test bench for a drive motor that integrates water cooling and oil cooling, including: A compressor circuit, comprising a compressor, an evaporator, an expansion valve, and a condenser connected in series; A water-cooled internal circulation loop, the water-cooled internal circulation loop including a constant temperature solution tank connected to the evaporator, and an internal circulation pump connected between the constant temperature solution tank and the evaporator; The water-cooled external circulation loop includes a first load circulation branch connected to the constant temperature solution tank, and a first external circulation pump and a first solenoid valve are connected to the first load circulation branch. The oil cooling circulation loop includes a heat exchanger connected to the first load circulation branch, a second solenoid valve connected between the heat exchanger and the first load circulation branch, and an oil tank and an oil pump connected in series with the heat exchanger.

[0008] In some embodiments: the evaporator includes a first refrigerant line connecting the compressor and the expansion valve, and a first closed hot water exchange tank housing the first refrigerant line, wherein the constant temperature solution tank and the first closed hot water exchange tank are interconnected through an internal circulation line; The internal circulation pipeline includes a first internal circulation pipeline and a second internal circulation pipeline, which are connected in parallel between the constant temperature solution tank and the first closed hot water exchange tank. The internal circulation pump is connected to the first internal circulation pipeline.

[0009] In some embodiments, the condenser includes a second refrigerant line connecting the compressor and the expansion valve, and a second enclosed hot water exchange tank housing the second refrigerant line. The second enclosed hot water exchange tank is connected to an external cooling water tank, and the external cooling water tank and the second enclosed hot water exchange tank are interconnected through an external circulating water circuit.

[0010] In some embodiments: the first load circulation branch is provided with a first temperature sensor and a first flow meter, the constant temperature solution tank is provided with a heater, and the first temperature sensor and the first flow meter are connected to a controller; The controller is used to acquire monitoring signals from the first temperature sensor and the first flow meter, and to control the operating power of the heater and the first external circulation pump according to the monitoring signals.

[0011] In some embodiments, the water-cooled external circulation loop further includes a second load circulation branch connected to the constant temperature solution tank, and the second load circulation branch is connected to a second external circulation pump, a second temperature sensor and a second flow meter. The second temperature sensor and the second flow meter are connected to a controller, which is used to acquire the monitoring signals of the second temperature sensor and the second flow meter, and control the operating power of the heater and the second external circulation pump according to the monitoring signals.

[0012] In some embodiments: the first load circulation branch and the second load circulation branch both include an inlet branch and a drain branch. The inlet branch is provided with a cooling water inlet connector for connecting to the load being cooled, and the drain branch is provided with a cooling water outlet connector for connecting to the load being cooled. The first solenoid valve and the first external circulation pump are connected to the inlet branch of the first load circulation branch, and the first temperature sensor and the first flow meter are connected to the outlet branch of the first load circulation branch. The second external circulation pump is connected to the inlet branch of the second load circulation branch, and the second temperature sensor and the second flow meter are connected to the outlet branch of the second load circulation branch.

[0013] In some embodiments: the heat exchanger includes a third closed hot water tank, the third closed hot water tank being connected to the first load circulation branch via a third load circulation branch, and the second solenoid valve being connected to the third load circulation branch; The oil cooling circulation loop also includes an oil cooling circulation pipeline that connects the oil tank and the oil pump in series. Part of the oil cooling circulation pipeline is located inside the third closed hot water exchange tank. A third temperature sensor and a third flow meter are connected to the oil cooling circulation pipeline.

[0014] In some embodiments: the oil cooling circulation pipeline includes an oil inlet branch and an oil outlet branch, the oil inlet branch is provided with a cooling oil inlet connector for connecting to the load being cooled, and the oil outlet branch is provided with a cooling oil outlet connector for connecting to the load being cooled. The oil tank and oil pump are connected to the oil inlet branch, the third temperature sensor and the third flow meter are connected to the oil outlet branch, and a pneumatically controlled diaphragm pump is also connected to the oil inlet branch.

[0015] In some embodiments: the third temperature sensor and the third flow meter are connected to a controller, which is used to acquire the monitoring signals of the third temperature sensor and the third flow meter, and control the operating power of the heater, the first external circulation pump and the oil pump according to the monitoring signals.

[0016] A second aspect of this application provides a control method for an integrated water-cooled and oil-cooled drive motor test bench. The method uses the integrated water-cooled and oil-cooled drive motor test bench described in any of the above embodiments. The method includes: When the compressor circuit is started, the compressor controls the refrigerant to circulate between the evaporator, expansion valve and condenser. The refrigerant enters the evaporator to cool and absorb heat. Start the water-cooled internal circulation loop. The internal circulation pump pumps the cooling water in the constant temperature solution tank into the evaporator to achieve heat exchange, cooling and regulation, and then flows back to the constant temperature solution tank. Select to open or close the first or second solenoid valve according to the type of coolant in the load being cooled; When the coolant of the load being cooled is water-cooled, the first solenoid valve is opened and the second solenoid valve is closed. The first external circulation pump pumps the cooling water in the constant temperature solution tank into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank. When the coolant of the load being cooled is oil-cooled, the second solenoid valve is opened and the first solenoid valve is closed. The first external circulation pump pumps the cooling water in the constant temperature solution tank into the heat exchanger. The oil pump pumps the cooling oil in the oil tank into the heat exchanger to achieve heat exchange, cooling and regulation, and then enters the load being cooled connected to the oil cooling circulation loop before flowing back to the oil tank. When the cooling water of the load being cooled is both oil-cooled and water-cooled, the first solenoid valve and the second solenoid valve are opened simultaneously. The first external circulation pump pumps a portion of the cooling water in the constant temperature solution tank into the load being cooled connected to the first load circulation branch and then returns it to the constant temperature solution tank. The first external circulation pump pumps another portion of the cooling water in the constant temperature solution tank into the heat exchanger. The oil pump pumps the cooling oil in the oil tank into the heat exchanger to achieve heat exchange, cooling and regulation, and then enters the cooled load connected to the oil cooling circulation loop before flowing back to the oil tank.

[0017] The beneficial effects of the technical solution provided in this application include: This application provides an integrated water-cooled and oil-cooled drive motor test bench and control method. The integrated water-cooled and oil-cooled drive motor test bench includes a compressor circuit comprising a compressor, evaporator, expansion valve, and condenser connected in series; a water-cooled internal circulation circuit comprising a constant-temperature solution tank connected to the evaporator, with an internal circulation pump connected between the constant-temperature solution tank and the evaporator; a water-cooled external circulation circuit comprising a first load circulation branch connected to the constant-temperature solution tank, with a first external circulation pump and a first solenoid valve connected to the first load circulation branch; and an oil-cooled circulation circuit comprising a heat exchanger connected to the first load circulation branch, with a second solenoid valve connected between the heat exchanger and the first load circulation branch, and an oil tank and oil pump connected in series with the heat exchanger.

[0018] Therefore, in the integrated water-cooled and oil-cooled drive motor test bench of this application, the compressor controls the refrigerant to circulate between the evaporator, expansion valve, and condenser during use. The refrigerant enters the evaporator for cooling and heat absorption. The internal circulation pump pumps the cooling water in the constant temperature solution tank into the evaporator to achieve heat exchange, cooling, and regulation before returning it to the constant temperature solution tank. The first solenoid valve or the second solenoid valve is opened or closed according to the type of coolant of the cooled load. When the coolant of the cooled load is water-cooled, the first solenoid valve is opened and the second solenoid valve is closed. The first external circulation pump pumps the cooling water in the constant temperature solution tank into the cooled load connected to the first load circulation branch before returning it to the constant temperature solution tank.

[0019] When the coolant of the load being cooled is oil-cooled, the second solenoid valve is opened and the first solenoid valve is closed. The first external circulation pump pumps the cooling water from the constant-temperature solution tank into the heat exchanger, and the oil pump pumps the cooling oil from the oil tank into the heat exchanger. After heat exchange and cooling, the oil enters the load being cooled connected to the oil-cooling circulation loop and then flows back to the oil tank. When the coolant of the load being cooled is both oil-cooled and water-cooled, the first and second solenoid valves are opened simultaneously. The first external circulation pump pumps a portion of the cooling water from the constant-temperature solution tank into the load being cooled connected to the first load circulation branch and then flows back to the constant-temperature solution tank; the first external circulation pump pumps the other portion of the cooling water from the constant-temperature solution tank into the heat exchanger, and the oil pump pumps the cooling oil from the oil tank into the heat exchanger. After heat exchange and cooling, the oil enters the load being cooled connected to the oil-cooling circulation loop and then flows back to the oil tank.

[0020] This application integrates the water-cooled external circulation loop and oil-cooled circulation loop with the compressor loop and water-cooled internal circulation loop, sharing the same compressor loop and water-cooled internal circulation loop. In the drive motor test chamber, the water-cooled external circulation loop and oil-cooled circulation loop can be flexibly selected based on the drive motor's oil-cooling or water-cooling method. By controlling the opening or closing of the first and second solenoid valves, free switching between oil cooling and water cooling is achieved. The same compressor loop and water-cooled internal circulation loop can satisfy both water-cooling and oil-cooling temperature regulation and control, reducing the production and operation costs of the test equipment and improving equipment utilization efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the drive motor test bench structure according to an embodiment of this application.

[0023] Figure label: 101. Compressor; 102. Condenser; 103. Evaporator; 104. Internal circulation pump; 105. Thermostatic solution tank; 106. Heater; 107. Second flow meter; 108. Second temperature sensor; 109. Second external circulation pump; 110. First flow meter; 111. First temperature sensor; 112. First external circulation pump; 113. First solenoid valve; 114. Second solenoid valve; 115. Second refrigerant line; 116. Second internal circulation line; 117. Drainage branch; 118. Expansion valve; 201. Heat exchanger; 202. Oil pump; 203. Oil tank; 204. Third flow meter; 205. Third temperature sensor; 206. Oil drain branch; 207. Pneumatically controlled diaphragm pump. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] This application provides an integrated water-cooled and oil-cooled drive motor test bench and control method, which can solve the problem in related technologies where motor test benches are equipped with independent water-cooled temperature control devices and oil-cooled temperature control devices, resulting in low equipment utilization and increased cost of motor test benches.

[0026] See Figure 1 As shown, the first aspect of this application provides a test bench for a drive motor that integrates water cooling and oil cooling, comprising: The compressor circuit includes a compressor 101, an evaporator 103, an expansion valve 118, and a condenser 102 connected in series. When the drive motor test bench is turned on, in the compressor circuit, the refrigerant in the evaporator 103 undergoes heat exchange, its temperature rises, and it becomes gaseous. It is then drawn into the compressor 101 and transformed into a high-temperature, high-pressure gas. After entering the condenser 102 and exchanging heat with external cooling water, it becomes a high-pressure, room-temperature liquid. It then passes through the expansion valve 118 to reduce its pressure and re-enters the evaporator 103 to achieve refrigeration.

[0027] The water-cooled internal circulation loop includes a constant-temperature solution tank 105 connected to the evaporator 103, and an internal circulation pump 104 connected between the constant-temperature solution tank 105 and the evaporator 103. In the water-cooled internal circulation loop, the internal circulation pump 104 pumps cooling water from the constant-temperature solution tank 105 into the evaporator 103 for cooling and regulation. At the same time, the heater 106 in the constant-temperature solution tank 105 can control the temperature rise of the cooling water. By adjusting the compressor 101 and the heater 106, the cooling water temperature in the constant-temperature solution tank 105 can be precisely controlled.

[0028] The water-cooled external circulation loop includes a first load circulation branch connected to the constant temperature solution tank 105. A first external circulation pump 112 and a first solenoid valve 113 are connected to the first load circulation branch. The first external circulation pump 112 and the first solenoid valve 113 on the first load circulation branch are used to pump cooling water from the constant temperature solution tank 105 into the load under test, which is cooled by the cooling water, and to provide it with a suitable test temperature during bench testing.

[0029] The oil-cooled circulation loop includes a heat exchanger 201 connected to the first load circulation branch, a second solenoid valve 114 connected between the heat exchanger 201 and the first load circulation branch, and an oil tank 203 and an oil pump 202 connected in series with the heat exchanger 201. When a load under test cooled by cooling oil is connected to the oil-cooled circulation loop, the second solenoid valve 114, the first external circulation pump 112, and the oil pump 202 are opened simultaneously.

[0030] The first external circulation pump 112 pumps the cooling water in the constant temperature solution tank 105 into the heat exchanger 201, and the oil pump 202 pumps the cooling oil in the oil tank 203 into the heat exchanger 201 to exchange heat with the cooling water for cooling and regulation. The cooling oil cooled by the heat exchanger 201 enters the tested load cooled by the cooling oil and provides it with a suitable test temperature during bench testing.

[0031] In this embodiment of the application, the integrated water-cooled and oil-cooled drive motor test bench is used so that the compressor 101 controls the refrigerant to circulate between the evaporator 103, the expansion valve 118 and the condenser 102. The refrigerant enters the evaporator 103 to cool and absorb heat. The internal circulation pump 104 pumps the cooling water in the constant temperature solution tank 105 into the evaporator 103 to achieve heat exchange, cooling and regulation, and then returns it to the constant temperature solution tank 105.

[0032] The first solenoid valve 113 or the second solenoid valve 114 is opened or closed according to the type of coolant of the load being cooled. When the coolant of the load being cooled is water-cooled, the first solenoid valve 113 is opened and the second solenoid valve 114 is closed. The first external circulation pump 112 pumps the cooling water in the constant temperature solution tank 105 into the load being cooled connected to the first load circulation branch and then returns it to the constant temperature solution tank 105.

[0033] When the coolant of the load being cooled is oil-cooled, the second solenoid valve 114 is opened and the first solenoid valve 113 is closed. The first external circulation pump 112 pumps the cooling water in the constant temperature solution tank 105 into the heat exchanger 201. The oil pump 202 pumps the cooling oil in the oil tank 203 into the heat exchanger 201 to achieve heat exchange. After the cooling oil is cooled and regulated, it enters the load being cooled connected to the oil-cooled circulation loop and then flows back to the oil tank 203.

[0034] When the cooling water of the load being cooled is both oil-cooled and water-cooled, the first solenoid valve 113 and the second solenoid valve 114 are opened simultaneously. The first external circulation pump 112 pumps a portion of the cooling water in the constant temperature solution tank 105 into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank 105.

[0035] The first external circulation pump 112 pumps another part of the cooling water in the constant temperature solution tank 105 into the heat exchanger 201. The oil pump 202 pumps the cooling oil in the oil tank 203 into the heat exchanger 201 to achieve heat exchange and cooling regulation. After that, the cooling oil enters the cooled load connected to the oil cooling circulation loop and then flows back to the oil tank 203.

[0036] In this application embodiment, the water-cooled external circulation loop and oil-cooled circulation loop are integrated with the compressor loop and water-cooled internal circulation loop, sharing the compressor loop and water-cooled internal circulation loop. In the test bench of the drive motor, the water-cooled external circulation loop and oil-cooled circulation loop can be flexibly selected according to the oil-cooling or water-cooling cooling method of the drive motor.

[0037] By controlling the opening or closing of the first solenoid valve 113 and the second solenoid valve 114, the oil cooling and water cooling can be switched freely. The same compressor circuit and water cooling internal circulation circuit can meet the temperature regulation and control of water cooling and oil cooling, which reduces the production and operation cost of bench test equipment and improves equipment utilization efficiency.

[0038] In some alternative embodiments: see Figure 1 As shown, the first aspect of this application provides a test bench for a drive motor that integrates water cooling and oil cooling. The evaporator 103 of the test bench includes a first refrigerant pipeline connecting a compressor 101 and an expansion valve 118, and a first closed hot water exchange tank that houses the first refrigerant pipeline. The constant temperature solution tank 105 is interconnected with the first closed hot water exchange tank through an internal circulation pipeline.

[0039] The internal circulation pipeline includes a first internal circulation pipeline and a second internal circulation pipeline 116, which are connected in parallel between the constant temperature solution tank 105 and the first closed heat exchange tank. An internal circulation pump 104 is connected to the first internal circulation pipeline. The internal circulation pump 104 is used to pump cooling water from the constant temperature solution tank 105 into the first closed heat exchange tank through the first internal circulation pipeline.

[0040] The cooling water entering the first closed heat exchange tank exchanges heat with the first refrigerant pipeline of the evaporator 103 to achieve cooling regulation. After being cooled and regulated by the first refrigerant pipeline, the cooling water is discharged from the first closed heat exchange tank and flows back to the constant temperature solution tank 105 through the second internal circulation pipeline 116, completing one cooling cycle of the cooling water.

[0041] In some alternative embodiments: see Figure 1 As shown, the first aspect of this application provides a test bench for a drive motor that integrates water cooling and oil cooling. The condenser 102 of the test bench includes a second refrigerant pipeline 115 connecting the compressor 101 and the expansion valve 118, and a second enclosed hot water tank that houses the second refrigerant pipeline 115.

[0042] The second closed-loop heat exchanger is connected to an external cooling water tank, and the external cooling water tank and the second closed-loop heat exchanger are interconnected via an external circulating water circuit. When the condenser 102 is operating, it releases heat to the outside. To reduce the operating temperature of the condenser 102, the condenser 102 is equipped with a second closed-loop heat exchanger connected to the external cooling water tank. The external cooling water tank circulates cooling water to the second closed-loop heat exchanger, thereby cooling the second refrigerant pipeline 115.

[0043] In some alternative embodiments: see Figure 1 As shown, the first aspect of this application provides a drive motor test bench that integrates water cooling and oil cooling. The first load circulation branch of the drive motor test bench is provided with a first temperature sensor 111 and a first flow meter 110. A heater 106 is provided in the constant temperature solution tank 105. The first temperature sensor 111 and the first flow meter 110 are connected to a controller (not shown in the figure).

[0044] The controller acquires monitoring signals from the first temperature sensor 111 and the first flow meter 110, and controls the operating power of the heater 106 and the first external circulation pump 112 based on the monitoring signals. When the first temperature sensor 111 and the first flow meter 110 detect that the temperature and flow rate of the cooling water on the first load circulation branch deviate from the set threshold, the controller adjusts the operating power of the heater 106 and the first external circulation pump 112 to bring the temperature and flow rate of the cooling water back to the set threshold.

[0045] When the first temperature sensor 111 detects that the temperature of the cooling water on the first load circulation branch is too low, the controller controls the heating power of the heater 106 in the constant temperature solution tank 105 and reduces the operating power of the first external circulation pump 112. When the first temperature sensor 111 detects that the temperature of the cooling water on the first load circulation branch is too high, the controller increases the operating power of the first external circulation pump 112 to accelerate the cooling water circulation.

[0046] In some alternative embodiments: see Figure 1 As shown, the first aspect of this application provides a drive motor test bench that integrates water cooling and oil cooling. The water cooling external circulation loop of the drive motor test bench also includes a second load circulation branch connected to a constant temperature solution tank 105. A second external circulation pump 109, a second temperature sensor 108, and a second flow meter 107 are connected to the second load circulation branch.

[0047] The second temperature sensor 108 and the second flow meter 107 are connected to a controller. The controller acquires the monitoring signals from the second temperature sensor 108 and the second flow meter 107, and controls the operating power of the heater 106 and the second external circulation pump 109 based on the monitoring signals. The second load circulation branch and the first load circulation branch can simultaneously cool two water-cooled loads under test. If both loads under test are water-cooled motors and motor controllers, the first load circulation branch is connected to the motor, and the second load circulation branch is connected to the motor controller.

[0048] In some alternative embodiments: see Figure 1 As shown, the first aspect of this application provides a drive motor test bench integrating water cooling and oil cooling. Both the first and second load circulation branches of the drive motor test bench include a water inlet branch and a water outlet branch 117. The water inlet branch is provided with a cooling water inlet connector for connecting to the load being cooled, and the water outlet branch 117 is provided with a cooling water outlet connector for connecting to the load being cooled.

[0049] The first solenoid valve 113 and the first external circulation pump 112 are connected to the inlet branch of the first load circulation branch, and the first temperature sensor 111 and the first flow meter 110 are connected to the drain branch 117 of the first load circulation branch. The second external circulation pump 109 is connected to the inlet branch of the second load circulation branch, and the second temperature sensor 108 and the second flow meter 107 are connected to the drain branch 117 of the second load circulation branch.

[0050] In some alternative embodiments: see Figure 1As shown, the first aspect of this application provides a test bench for a drive motor that integrates water cooling and oil cooling. The heat exchanger 201 of the test bench includes a third closed hot water tank. The third closed hot water tank is connected to the inlet branch of the first load circulation branch through a third load circulation branch. A second solenoid valve 114 is connected to the third load circulation branch.

[0051] The oil cooling circulation loop also includes an oil cooling circulation pipeline connecting the oil tank 203 and the oil pump 202 in series. This oil cooling circulation pipeline is located within the third enclosed heat exchange tank. A third temperature sensor 205 and a third flow meter 204 are connected to the oil cooling circulation pipeline. The oil cooling circulation pipeline includes an oil inlet branch and an oil outlet branch 206. The oil inlet branch is equipped with a cooling oil inlet connector for connecting to the load being cooled, and the oil outlet branch 206 is equipped with a cooling oil outlet connector for connecting to the load being cooled.

[0052] The oil tank 203 and oil pump 202 are connected to the oil inlet branch. The third temperature sensor 205 and the third flow meter 204 are connected to the oil outlet branch 206. A pneumatically controlled diaphragm pump 207 is also connected to the oil inlet branch. The pneumatically controlled diaphragm pump 207 is used to control the liquid level of the cooling oil in the cooled load. The third temperature sensor 205 and the third flow meter 204 are connected to a controller. The controller is used to acquire the monitoring signals of the third temperature sensor 205 and the third flow meter 204, and control the operating power of the heater 106, the first external circulation pump 112, and the oil pump 202 according to the monitoring signals.

[0053] See Figure 1 As shown, a second aspect of this application provides a control method for an integrated water-cooled and oil-cooled drive motor test bench. The method uses the integrated water-cooled and oil-cooled drive motor test bench described in any of the above embodiments. The method includes: S101, Start the compressor circuit. The compressor 101 controls the refrigerant to circulate between the evaporator 103, the expansion valve 118 and the condenser 102. The refrigerant enters the evaporator 103 to cool and absorb heat.

[0054] S102. Start the water-cooled internal circulation loop. The internal circulation pump 104 pumps the cooling water in the constant temperature solution tank 105 into the evaporator 103 to achieve heat exchange, cooling and regulation, and then returns it to the constant temperature solution tank 105.

[0055] S103. Select to open or close the first solenoid valve 113 or the second solenoid valve 114 according to the type of coolant of the load being cooled.

[0056] S104. When the coolant of the load being cooled is water-cooled, open the first solenoid valve 113 and close the second solenoid valve 114. The first external circulation pump 112 pumps the cooling water in the constant temperature solution tank 105 into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank 105.

[0057] S105. When the coolant of the load being cooled is oil-cooled, the second solenoid valve 114 is opened and the first solenoid valve 113 is closed. The first external circulation pump 112 pumps the cooling water in the constant temperature solution tank 105 into the heat exchanger 201. The oil pump 202 pumps the cooling oil in the oil tank 203 into the heat exchanger 201 to achieve heat exchange and cooling regulation. After that, the oil enters the load being cooled connected to the oil-cooled circulation loop and then flows back to the oil tank 203.

[0058] S106. When the coolant of the load being cooled is both oil-cooled and water-cooled, the first solenoid valve 113 and the second solenoid valve 114 are opened at the same time. The first external circulation pump 112 pumps a portion of the cooling water in the constant temperature solution tank 105 into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank 105.

[0059] S107, the first external circulation pump 112 pumps another part of the cooling water in the constant temperature solution tank 105 into the heat exchanger 201, and the oil pump 202 pumps the cooling oil in the oil tank 203 into the heat exchanger 201 to achieve heat exchange, cooling and regulation, and then enters the cooled load connected to the oil cooling circulation loop and flows back to the oil tank 203.

[0060] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0061] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A test bench for drive motors integrating water cooling and oil cooling, characterized in that, include: The compressor (101) circuit includes a compressor (101), an evaporator (103), an expansion valve (118), and a condenser (102) connected in series. The water-cooled internal circulation loop includes a constant temperature solution tank (105) connected to the evaporator (103), and an internal circulation pump (104) is connected between the constant temperature solution tank (105) and the evaporator (103). The water-cooled external circulation loop includes a first load circulation branch connected to the constant temperature solution tank (105), and a first external circulation pump (112) and a first solenoid valve (113) are connected to the first load circulation branch. The oil cooling circulation loop includes a heat exchanger (201) connected to the first load circulation branch, a second solenoid valve (114) connected between the heat exchanger (201) and the first load circulation branch, and an oil tank (203) and an oil pump (202) connected in series with the heat exchanger (201).

2. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 1, characterized in that: The evaporator (103) includes a first refrigerant pipeline connecting the compressor (101) and the expansion valve (118), and a first closed hot water exchange tank that houses the first refrigerant pipeline. The constant temperature solution tank (105) is connected to the first closed hot water exchange tank through an internal circulation pipeline. The internal circulation pipeline includes a first internal circulation pipeline and a second internal circulation pipeline (116), which are connected in parallel between the constant temperature solution tank (105) and the first closed hot water exchange tank. The internal circulation pump (104) is connected to the first internal circulation pipeline.

3. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 1, characterized in that: The condenser (102) includes a second refrigerant line (115) connecting the compressor (101) and the expansion valve (118), and a second closed heat exchange tank that houses the second refrigerant line (115). The second closed heat exchange tank is connected to an external cooling water tank, and the external cooling water tank and the second closed heat exchange tank are interconnected through an external circulating water circuit.

4. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 1, characterized in that: The first load circulation branch is equipped with a first temperature sensor (111) and a first flow meter (110), and the constant temperature solution tank (105) is equipped with a heater (106). The first temperature sensor (111) and the first flow meter (110) are connected to a controller. The controller is used to acquire the monitoring signals of the first temperature sensor (111) and the first flow meter (110), and control the operating power of the heater (106) and the first external circulation pump (112) according to the monitoring signals.

5. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 4, characterized in that: The water-cooled external circulation loop also includes a second load circulation branch connected to the constant temperature solution tank (105), and the second load circulation branch is connected to a second external circulation pump (109), a second temperature sensor (108), and a second flow meter (107). The second temperature sensor (108) and the second flow meter (107) are connected to a controller. The controller is used to acquire the monitoring signals of the second temperature sensor (108) and the second flow meter (107), and to control the operating power of the heater (106) and the second external circulation pump (109) according to the monitoring signals.

6. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 5, characterized in that: The first load circulation branch and the second load circulation branch both include an inlet branch and a drain branch (117). The inlet branch is provided with a cooling water inlet connector for connecting to the load being cooled, and the drain branch (117) is provided with a cooling water outlet connector for connecting to the load being cooled. The first solenoid valve (113) and the first external circulation pump (112) are connected to the inlet branch of the first load circulation branch, and the first temperature sensor (111) and the first flow meter (110) are connected to the drain branch (117) of the first load circulation branch. The second external circulation pump (109) is connected to the inlet branch of the second load circulation branch, and the second temperature sensor (108) and the second flow meter (107) are connected to the drain branch (117) of the second load circulation branch.

7. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 1, characterized in that: The heat exchanger (201) includes a third closed hot water tank, which is connected to the first load circulation branch through a third load circulation branch, and the second solenoid valve (114) is connected to the third load circulation branch. The oil cooling circulation loop also includes an oil cooling circulation pipeline that connects the oil tank (203) and the oil pump (202) in series. Part of the oil cooling circulation pipeline is located inside the third closed heat exchange tank. A third temperature sensor (205) and a third flow meter (204) are connected to the oil cooling circulation pipeline.

8. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 7, characterized in that: The oil cooling circulation pipeline includes an oil inlet branch and an oil outlet branch (206). The oil inlet branch is provided with a cooling oil inlet connector for connecting to the load being cooled, and the oil outlet branch (206) is provided with a cooling oil outlet connector for connecting to the load being cooled. The oil tank (203) and oil pump (202) are connected to the oil inlet branch, the third temperature sensor (205) and the third flow meter (204) are connected to the oil outlet branch (206), and a pneumatic diaphragm pump (207) is also connected to the oil inlet branch.

9. The integrated water-cooled and oil-cooled drive motor test bench as described in claim 8, characterized in that: The third temperature sensor (205) and the third flow meter (204) are connected to a controller. The controller is used to acquire the monitoring signals of the third temperature sensor (205) and the third flow meter (204), and to control the operating power of the first external circulation pump (112) and the oil pump (202) according to the monitoring signals.

10. A control method for a drive motor test bench integrating water cooling and oil cooling, characterized in that, The method uses the integrated water-cooled and oil-cooled drive motor test bench according to any one of claims 1 to 9, and the method includes: Start the compressor (101) circuit. The compressor (101) controls the refrigerant to circulate between the evaporator (103), expansion valve (118) and condenser (102). The refrigerant enters the evaporator (103) to cool and absorb heat. Start the water-cooled internal circulation loop. The internal circulation pump (104) pumps the cooling water in the constant temperature solution tank (105) into the evaporator (103) to achieve heat exchange, cooling and regulation, and then returns it to the constant temperature solution tank (105). Select the first solenoid valve (113) or the second solenoid valve (114) to open or close depending on the type of coolant used to cool the load. When the coolant of the load being cooled is water-cooled, the first solenoid valve (113) is opened and the second solenoid valve (114) is closed. The first external circulation pump (112) pumps the cooling water in the constant temperature solution tank (105) into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank (105). When the coolant of the load being cooled is oil-cooled, the second solenoid valve (114) is opened and the first solenoid valve (113) is closed. The first external circulation pump (112) pumps the cooling water in the constant temperature solution tank (105) into the heat exchanger (201). The oil pump (202) pumps the cooling oil in the oil tank (203) into the heat exchanger (201) to achieve heat exchange and cooling regulation. Then it enters the load being cooled connected to the oil-cooled circulation loop and flows back to the oil tank (203). When the cooling water of the load being cooled is both oil-cooled and water-cooled, the first solenoid valve (113) and the second solenoid valve (114) are opened at the same time. The first external circulation pump (112) pumps a portion of the cooling water in the constant temperature solution tank (105) into the load being cooled connected to the first load circulation branch and then back into the constant temperature solution tank (105). The first external circulation pump (112) pumps another part of the cooling water in the constant temperature solution tank (105) into the heat exchanger (201). The oil pump (202) pumps the cooling oil in the oil tank (203) into the heat exchanger (201) to achieve heat exchange and cooling regulation. After entering the cooled load connected to the oil cooling circulation loop, it flows back to the oil tank (203).

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