Cooling device for motor test

Abstract

The utility model discloses a cooling device for motor testing, which comprises an oil inlet pump, an oil return pump, a heat exchanger and a heating tank which are sequentially connected through a pipeline, and the oil inlet pump is used for pumping cooling liquid into a motor to be tested; the oil return pump is used for pumping the cooling liquid out of the motor to be tested; the heat exchanger is connected with the oil return pump through a pipeline and is used for cooling the cooling liquid pumped out from the motor to be tested; the heating tank is connected between the heat exchanger and the oil inlet pump through a pipeline and used for heating the cooling liquid flowing out of the heat exchanger, and the heating tank can be controlled to be closed or opened. The cooling device is simultaneously provided with the heat exchanger and the heating tank, so that the temperature of the cooling liquid can be adjusted according to actual test conditions, and the flexibility is high.

Description

Technical Field

[0001] The utility model relates to the field of motor testing, in particular to a cooling device in motor testing. Background Art

[0002] The motor is the core component of new energy vehicles, mainly providing power for new energy vehicles. The efficiency and life of the motor are the core indicators for considering the performance of the motor. With the continuous development of my country's new energy vehicle industry, the speed, torque, power and other indicators of the motor are getting higher and higher, which means that the requirements for the efficiency and durability tests of new energy motors will also become higher and higher.

[0003] In the prior art, new energy motors are usually tested on high-speed benches. During the test, due to the high motor speed and large torque, the heat generated inside the motor will cause the motor temperature to rise rapidly. In order to be able to test normally, it is generally required to reasonably and effectively control the motor temperature to prevent the motor from being damaged due to demagnetization under high temperature conditions. Since the oil cooling equipment currently on the market can only provide stable temperature and flow for closed pipelines, and the inner cavity of the current oil-cooled motor is connected to the atmosphere, the air in the oil circuit does not have enough pressure to be discharged from the pipeline, resulting in flow fluctuations, poor cooling effect, and the motor also has the risk of oil leakage.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a cooling device for solving the problem of unsatisfactory cooling effect when testing a motor.

[0006] To achieve the above-mentioned purpose, the utility model provides a cooling device for motor testing, comprising an oil feed pump, an oil return pump, a heat exchanger and a heating tank which are connected in sequence through pipelines, the oil feed pump being used to pump coolant into the motor to be tested; the oil return pump being used to pump coolant out of the motor to be tested; the heat exchanger being connected to the oil return pump through a pipeline, and being used to cool the coolant pumped out of the motor to be tested; the heating tank being connected between the heat exchanger and the oil feed pump through a pipeline, and being used to heat the coolant flowing out of the heat exchanger, and the heating tank can be controllably closed or opened.

[0007] In one or more embodiments, the heat exchanger further includes a water inlet pipe and a water outlet pipe for external cooling water.

[0008] In one or more embodiments, a first electronic proportional valve is provided on the water inlet pipe.

[0009] In one or more embodiments, the cooling device for motor testing further includes an oil return tank for temporarily storing coolant, and the oil return tank is connected between the heat exchanger and the oil return pump through a pipeline.

[0010] In one or more embodiments, the oil return tank is provided with an expansion kettle and / or air holes.

[0011] In one or more embodiments, a drain valve is also provided on the heating tank.

[0012] In one or more embodiments, the motor testing cooling device further comprises an oil storage barrel and an oil pump, wherein the oil storage barrel is connected between the oil return pump and the oil return tank via a pipeline, and the oil pump is connected between the oil storage barrel and the oil return tank via a pipeline.

[0013] In one or more embodiments, an overflow pipe is connected between the liquid outlet of the oil inlet pump and the heating tank.

[0014] In one or more embodiments, a second electronic proportional valve is further provided on the overflow pipe.

[0015] In one or more embodiments, a third electronic proportional valve and / or a flow meter and / or a temperature sensor is provided in the pipeline connecting the oil feed pump and the motor to be tested.

[0016] Compared with the prior art, the cooling device of the utility model is provided with a heat exchanger and a heating tank at the same time, so the temperature of the coolant can be adjusted according to the actual test situation, and the flexibility is high. Secondly, the cooling device is designed with a two-stage oil return strategy, which makes the flow control of the coolant more stable and avoids the occurrence of oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a cooling device according to an embodiment of the utility model;

[0018] Figure 2 is a schematic diagram of a cooling device according to an embodiment of the present utility model from another angle;

[0019] Figure 3 is a top view of a cooling device according to an embodiment of the utility model;

[0020] Figure 4 It is a front view according to one embodiment of the utility model.

[0021] Description of main reference numerals:

[0022] 100-cooling device, 10-heat exchanger, 11-water inlet pipe, 12-water outlet pipe, 20-heating tank, 21-drain valve, 30-oil return tank, 31-expansion kettle, 32-air vent, 41-oil inlet pump, 42-oil return pump, 43-oil pump, 44-overflow pipe, 50-oil storage tank, 60-rack, 71-electronic proportional valve, 72-electronic proportional valve, 73-flow meter, 74-electronic proportional valve, 75-flow meter, 76-temperature sensor, 77-electronic proportional valve, 78-electronic proportional valve, 79-flow meter, 80-motor to be tested. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0024] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0025] like Figures 1 to 4 As shown, a cooling device 100 for motor testing according to one embodiment of the utility model includes an oil inlet pump 41, an oil return pump 42, a heat exchanger 10 and a heating tank 20 which are sequentially connected through pipelines, and the motor 80 to be tested is arranged between the oil inlet pump 41 and the oil return pump 42.

[0026] The oil inlet pump 41 pumps the coolant in the heating tank 20 into the motor to be tested 80. After completing the heat exchange with the motor to be tested 80 and taking away its heat, the oil return pump 42 pumps the coolant from the motor to be tested 80 to the heat exchanger 10. The coolant is cooled in the heat exchanger 10 and then flows into the heating tank 20. Whether to heat it is selected as needed.

[0027] Since the cooling device 100 is provided with both the heat exchanger 10 and the heating tank 20, when it is necessary to increase the temperature of the coolant pumped into the motor 80 to be tested, the heating tank 20 can be started to heat the coolant, while the heat exchanger 10 is turned off or its cooling efficiency is reduced; and when it is necessary to reduce the temperature of the coolant pumped into the motor 80 to be tested, the heating tank 20 can be turned off, while the cooling efficiency of the heat exchanger 10 is increased. Therefore, during the test, the cooling device 100 can adjust the temperature of the coolant in real time according to the actual operation and heat dissipation requirements of the motor 80 to be tested, and has high flexibility.

[0028] Specifically, the heat exchanger 10 includes two liquid paths, one of which is connected to the heating tank 20 and the oil return pump 42 for flowing the internal coolant, and the other is for connecting the external cooling water. The two liquid paths complete the heat exchange inside the heat exchanger 10, the hotter coolant is cooled, and the cooling water temperature is increased. Figure 2 , 3 As shown in FIG. 4 , a water inlet pipe 11 and a water outlet pipe 12 are provided on the surface of the heat exchanger 10 , and a pipeline connecting the two is provided inside (not shown in the figure). The cooling water flows into the heat exchanger 10 through the water inlet pipe 11 and then flows out from the water outlet pipe 12 .

[0029] Preferably, an electronic proportional valve 71 is provided on the water inlet pipe 11 to control the flow rate of cooling water. When the cooling efficiency of the coolant needs to be improved, the opening and closing area of ​​the electronic proportional valve 71 can be enlarged, the amount of cooling water flowing through per unit time increases, the heat transfer efficiency increases, the cooling effect of the coolant is improved, and the temperature of the coolant flowing out of the heat exchanger 10 is lower. When the cooling efficiency of the coolant needs to be reduced, the opening and closing area of ​​the electronic proportional valve 71 can be reduced, the amount of cooling water flowing through per unit time decreases, the heat transfer efficiency decreases, the cooling effect of the coolant decreases, and the temperature of the coolant flowing out of the heat exchanger 10 is higher.

[0030] like Figure 2 , 3 As shown in FIG. 4 , the cooling device 100 further includes an oil return tank 30 , which is disposed between the oil return pump 42 and the heat exchanger 10 , and the oil return tank 30 is used to temporarily store the coolant extracted from the motor 80 to be tested.

[0031] Furthermore, the oil return tank 30 is also provided with an expansion kettle 31, through which the overall liquid level of the coolant in the oil return tank 30 can be observed. At the same time, the oil return tank 30 is also provided with an air vent 32 for discharging excess air in the pipeline.

[0032] Since the inner cavity of the motor 80 to be tested is mostly irregular in shape and of different sizes, a single oil return pump 42 cannot achieve effective oil return, because the inner cavity of the motor 80 to be tested is connected to the atmosphere in a non-closed manner, and the inability to effectively return oil will cause oil to leak from the gaps in the prototype. Therefore, an oil storage tank 50 and an oil pump 43 are also provided between the oil return pump 42 and the oil return tank 30. The coolant pumped out from the motor 80 to be tested by the oil return pump 42 first enters the oil storage tank 50, and then is pumped into the oil return tank 30 by the oil pump 43. Therefore, the cooling device 100 adopts a two-stage oil return strategy, with the oil storage tank 50 providing a primary buffering effect and the oil return tank 30 providing a secondary buffering effect, so that the coolant control is more stable.

[0033] The motor 80 to be tested is provided with a rotor and a stator, and both parts need to be cooled at the same time. Therefore, the pipeline is divided into two branches at the motor 80 to be tested, and each branch is provided with an electronic proportional valve 72 and an electronic proportional valve 78, as well as a flow meter 73 and a flow meter 79 for controlling and monitoring the flow rate of the coolant.

[0034] Furthermore, an electronic proportional valve 74 and a flow meter 75 are also provided on the main pipe to control and monitor the flow rate of the coolant in the main pipe. Preferably, a temperature sensor 76 is also provided on the main pipe to monitor the temperature of the coolant flowing into the motor 80 to be tested and provide adjustment data to the heating tank 20 and the heat exchanger 10.

[0035] In actual operation, the coolant flow rate needs to be adjusted according to the different working conditions of the motor 80 to be tested, while the speed of the oil inlet pump 41 is constant, and the output coolant flow rate is constant. When the flow rate required for cooling the motor 80 to be tested is less than the output flow rate of the oil inlet pump 41, the oil inlet pump 41 may be burned. To avoid the above situation, in addition to the pipeline connected to the motor 80 to be tested, the oil inlet pump 41 is also provided with an overflow pipeline, which is realized by an overflow pipe 44 connected between the oil inlet pump 41 and the heating tank 20. The overflow pipe 44 is arranged between the liquid outlet of the oil inlet pump 41 and the heating tank 20, and the excess coolant flows back to the heating tank 20 through the overflow pipe 44 to protect the oil inlet pump 41.

[0036] It is easy to imagine that the overflow pipe 44 is also provided with an electronic proportional valve 77 for controlling the flow rate of the coolant in the overflow pipe 44 to prevent too little coolant from flowing into the motor 80 to be tested and affecting the cooling effect.

[0037] Preferably, the heating tank 20 is also provided with a drain valve 21. When the internal pipeline needs to be cleaned, the drain valve 21 can be opened to drain the internal coolant, and then clean water or other cleaning agents can be added for cleaning.

[0038] like Figure 2 , 3 As shown in FIG. 4 , the cooling device 100 further includes a frame 60, on which the oil feed pump 41, the oil return tank 30, the heat exchanger 10 and the heating tank 20 are fixed to improve stability, and the oil return pump 42, the oil storage tank 50 and the oil pump 43 are flexibly arranged. Due to the arrangement sequence, the oil return tank 30, the heat exchanger 10, the heating tank 20 and the oil feed pump 41 are arranged in sequence from top to bottom. Of course, the oil return pump 42, the oil storage tank 50 and the oil pump 43 can also be fixed to the frame 60 to improve overall stability.

[0039] The cooling device 100 provided by the present invention is further described below in conjunction with specific usage scenarios.

[0040] When a motor 80 to be tested needs to be tested, it is moved to the vicinity of the frame 60 and connected to the two coolant branches, and then the oil inlet pump 41, the oil return pump 42 and the oil extraction pump 43 are started to allow the coolant to flow to cool the motor 80 to be tested. When the motor working condition is adjusted and the flow rate of the coolant flowing in needs to be adjusted, the electronic proportional valve 72 and the electronic proportional valve 78 on the two branches can be operated respectively to control; when the cooling effect of the motor 80 to be tested needs to be improved, the heating tank 20 can be closed, and the electronic proportional valve 71 can be controlled to increase the flow rate of the cooling water to reduce the temperature of the coolant flowing into the motor 80 to be tested; on the contrary, when the cooling effect of the motor 80 to be tested needs to be reduced, the heating tank 20 can be opened, and the electronic proportional valve 71 can be controlled to reduce the flow rate of the cooling water to increase the temperature of the coolant flowing into the motor 80 to be tested.

[0041] During the test process, the coolant overflow flow can be adjusted by controlling the electronic proportional valve 77, the total coolant flow flowing into the motor to be tested 80 can be adjusted by controlling the electronic proportional valve 74, the coolant flow used to cool the rotor and stator parts of the motor to be tested 80 can be monitored by flowmeters 73 and 79, the total coolant flow can be monitored by flowmeter 75, and the coolant temperature flowing into the motor to be tested 80 can be monitored by temperature sensor 76. The above data can provide a basis for adjusting the coolant temperature and flow, and provide a reference for the performance and test results of the motor to be tested 80.

[0042] It should be understood that, in addition to motors used in vehicles, the cooling device 100 can be widely used in testing other motors, and this embodiment is not limiting.

[0043] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A cooling device for motor testing, characterized in that: Including connected in sequence by pipelines: Oil feed pump, used to pump coolant into the motor to be tested; Oil return pump, used to pump coolant out of the motor under test; A heat exchanger connected to the oil return pump through a pipeline and used for cooling the coolant pumped out from the motor to be tested; as well as The heating tank is connected between the heat exchanger and the oil feed pump through a pipeline and is used to heat the coolant flowing out of the heat exchanger. The heating tank can be closed or opened in a controlled manner.

2. The cooling device for motor testing according to claim 1, characterized in that: The heat exchanger also includes a water inlet pipe and a water outlet pipe for externally connecting cooling water.

3. The cooling device for motor testing according to claim 2, characterized in that: The water inlet pipe is provided with a first electronic proportional valve.

4. The cooling device for motor testing according to claim 1, characterized in that: It also includes an oil return tank for temporarily storing the coolant, and the oil return tank is connected between the heat exchanger and the oil return pump through a pipeline.

5. The cooling device for motor testing according to claim 4, characterized in that: The oil return tank is provided with an expansion kettle and / or air holes.

6. The cooling device for motor testing according to claim 1, characterized in that: The heating tank is also provided with a drain valve.

7. The cooling device for motor testing according to claim 1, characterized in that: It also includes an oil storage barrel and an oil pump. The oil storage barrel is connected between the oil return pump and the oil return tank through a pipeline, and the oil pump is connected between the oil storage barrel and the oil return tank through a pipeline.

8. The cooling device for motor testing according to claim 1, characterized in that: An overflow pipe is also connected between the liquid outlet of the oil inlet pump and the heating tank.

9. The cooling device for motor testing according to claim 8, characterized in that: The overflow pipe is also provided with a second electronic proportional valve.

10. The cooling device for motor testing according to claim 1, characterized in that: A third electronic proportional valve and / or a flow meter and / or a temperature sensor is arranged in the pipeline connecting the oil feed pump and the motor to be tested.

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