Motor medium oil temperature control system

Abstract

The invention relates to the technical field of new energy motor detection, in particular to a motor medium oil temperature control system which comprises an oil tank used for storing medium oil, and the oil tank is communicated with a motor through an outer circulation pipeline and conveys the medium oil used for controlling the temperature of the motor. The outer circulation pipeline is communicated with the heating assembly and the cooling assembly, the heating assembly is used for heating medium oil, and the cooling assembly is used for cooling the medium oil. The medium oil with constant temperature is conveyed to the motor through the outer circulation pipeline, the property of the medium oil is stable and reliable, and stable operation of the motor can be kept; when the operating environment temperatures of the motor are different, the temperature of the medium oil can be adjusted through the heating assembly and the cooling assembly, and the temperature change required by the motor is met, so that the reliable operation of the motor is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy motor detection, and particularly relates to a motor dielectric oil temperature control system. Background Art

[0002] Under the environment of the rapid development of the new energy vehicle industry, vehicle drive motors are constantly moving towards higher torque density and higher power density. Under the demand of continuous improvement of power density and torque density, the temperature rise of the motor has become the most difficult problem to solve. At present, the cooling of motors can be divided into two categories: air cooling and liquid cooling according to the cooling medium. Liquid cooling can be further subdivided into water cooling and oil cooling. Air cooling is currently only applicable to some small-power motors. Water cooling is to add water channels in the motor housing and take away the heat through heat exchange. It is the current mainstream cooling method. However, since the high-temperature part of the motor is mainly concentrated at the winding end, the cooling circulating water in the water cooling method has the ability to conduct electricity and cannot directly contact the high-temperature part and cool the heat source. The heat generated at the winding needs to pass through the insulation layer in the slot and the motor stator before it can be transferred to the housing and taken away by the cooling water. This water cooling method has a long transfer path, and the mating tolerances between components affect the thermal resistance of the transfer path. Due to the existence of thermal resistance, heat cannot be completely transferred from the winding to the water-cooled housing, and there is a temperature gradient on the transfer path. The winding cannot be directly cooled, which easily leads to temperature accumulation and the formation of local hot spots. At the same time, due to the existence of water channels, the volume of the motor also increases.

[0003] To solve these pain points brought by the water cooling method, the oil cooling method has gradually developed in the market, and many vehicle enterprises have applied the oil cooling technology to mass-produced models. Compared with water cooling, the advantage of oil cooling is that the oil product is non-conductive, non-magnetic, and has good insulation performance. It can directly contact the internal components of the motor and penetrate into the rotor and stator windings for more comprehensive heat exchange, resulting in higher heat dissipation efficiency. However, compared with the coolant constant temperature system, oil cooling has the following problems:

[0004] 1. The kinematic viscosity of the dielectric oil changes at different temperatures. The lower the kinematic viscosity, the worse the fluidity of the oil, which affects the actual performance of the motor;

[0005] 2. Because the kinematic viscosity of the dielectric oil is different at different temperatures and the fluidity is different, a special PID algorithm is required to control the temperature within the precise range during temperature control, resulting in an increase in control difficulty.

[0006] Therefore, there is still room for urgent improvement in the current motor oil cooling system, and it should be optimized to improve the temperature control accuracy of the dielectric oil during the circulation process, keep the dielectric oil within a reasonable temperature range, so as to maintain the stability and reliability of the dielectric oil. Therefore, a more reasonable technical solution needs to be proposed to solve the technical problems existing in the prior art. Summary of the Invention

[0007] To overcome at least one of the above-mentioned defects, the present invention proposes a temperature control system for the dielectric oil of an electric motor, which heats the dielectric oil to meet the requirements of the high-temperature operation of the motor and cools the dielectric oil to meet the requirements of the low-temperature operation of the motor.

[0008] To achieve the above object, the oil-cooling temperature control system disclosed by the present invention can adopt the following technical solutions:

[0009] A temperature control system for the dielectric oil of an electric motor includes an oil tank for storing dielectric oil. The oil tank is connected to the electric motor through an external circulation pipeline and conveys the dielectric oil for controlling the temperature of the electric motor. The external circulation pipeline is connected to a heating component and a cooling component. The heating component is used to heat the dielectric oil, and the cooling component is used to cool the dielectric oil.

[0010] For the above-disclosed temperature control system, the temperature of the dielectric oil such as engine oil that can enter the interior of the electric motor is adjusted, so that the temperature of the dielectric oil can be kept constant, thereby maintaining the stable properties of the dielectric oil during the test operation of the electric motor, making the operation of the electric motor stable, and enabling the heat generated during the operation of the electric motor to be dissipated outward in time along with the engine oil, thereby improving the operation reliability of the electric motor.

[0011] Further, during the process of conveying the dielectric oil, the external circulation pipeline ensures that the dielectric oil smoothly reaches the electric motor from the oil tank and can smoothly send the dielectric oil in the electric motor back to the oil tank to form a circulation. The external circulation pipeline can adopt various solutions to achieve the above process, and its structure is not uniquely limited. Here, an optimization is carried out and a feasible option is proposed: The external circulation pipeline includes an oil injection pipeline and an oil return pipeline. A circulation pump for pumping the dielectric oil to the electric motor is provided on the oil injection pipeline, and a suction pump for pumping the dielectric oil in the electric motor back to the oil tank is provided on the oil return pipeline. When adopting the above solution, the circulation pump and the suction pump can adopt vacuum pumps.

[0012] Further, the heating component is used to heat the dielectric oil to meet the requirements of the high-temperature operation of the electric motor. The heating component can adopt various solutions. Here, an optimization is carried out and a feasible option is proposed: The heating component includes a heating tank, and a dielectric oil pipeline and an electric heating tube are arranged in the heating tank. When the electric heating tube is started, the dielectric oil entering the dielectric oil pipeline in the heating tank is heated to a set temperature. When adopting the above solution, the dielectric oil pipeline is arranged in a spiral shape in the heating tube, which can improve the heating effect.

[0013] Further, in order to determine the temperature of the dielectric oil, a temperature measurement scheme can be adopted to measure the temperature of the dielectric oil. The temperature measurement scheme can adopt various structures, and its structure is not uniquely limited. Here, an optimization is carried out and a feasible option is proposed: A temperature sensor is also provided at the heating tank for detecting the temperature of the dielectric oil in the heating tank.

[0014] Furthermore, the cooling component is used to cool the dielectric oil, so as to meet the low-temperature operation requirements of the motor, avoid the motor running at too high a temperature, and maintain the stable and reliable operation of the motor. The cooling component can adopt various schemes, and its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: The cooling component includes a front heat exchanger, and the front heat exchanger is connected to the rear heat exchanger through a cooling pipeline. There is a cooling medium circulating in the cooling pipeline, and the dielectric oil flowing from the fuel tank into the external circulation pipeline is cooled after passing through the front heat exchanger. When adopting the above scheme, plate heat exchangers can be used for the front heat exchanger and the rear heat exchanger.

[0015] Furthermore, the heating component and the cooling component adjust the temperature of the dielectric oil in the external circulation pipeline, and only one of them is turned on for operation. The cooling component can be turned on or off by controlling the circulation path of the cooling medium, and its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: A switching valve is provided on the cooling pipeline. When the switching valve is switched to the cooling position, the cooling medium in the cooling pipeline circulates into the front heat exchanger. When the switching valve is switched to the rest position, the cooling medium in the cooling pipeline directly returns through the return bypass. When adopting the above scheme, a three-way valve can be used as the switching valve, forming a return bypass on the cooling pipeline at the front heat exchanger, and the three-way valve controls the dielectric oil to enter the front heat exchanger for cooling and heat exchange, or directly returns through the return bypass.

[0016] Furthermore, the rear heat exchanger is used to cool and exchange heat with the cooling medium in the cooling pipeline to ensure that it has sufficient cooling capacity at the front heat exchanger. The setting structure at the rear heat exchanger can adopt various schemes, and its structure is not uniquely defined. Here, an optimization is carried out and one feasible option is proposed: The rear heat exchanger is arranged in the cooling medium tank. The cooling medium in the cooling medium tank enters the rear heat exchanger and is cooled to the set temperature. The rear heat exchanger transports the cooling medium to the front heat exchanger through the cooling pipeline, and the front heat exchanger is connected to the cooling medium tank through the cooling pipeline and is used to return the heat-exchanged cooling medium. When adopting the above scheme, corresponding pipelines are provided on the cooling medium tank to communicate with the rear heat exchanger, facilitating the transportation of the dielectric oil from the cooling medium tank to the rear heat exchanger.

[0017] Furthermore, when the cooling medium is specifically heat-exchanged at the rear-end heat exchanger, it can be achieved through various solutions. Here, one feasible option is proposed: the rear-end heat exchanger is connected to a refrigeration system, which includes a refrigeration pipeline. A compressor and a condenser are provided on the refrigeration pipeline, and a refrigeration medium circulates in the refrigeration pipeline. The refrigeration medium is used to absorb the heat of the rear-end heat exchanger and then vaporize. After passing through the compressor and the condenser, it is re-cooled and liquefied and then circulated back to the rear-end heat exchanger. When the above solution is adopted, the refrigeration medium in the refrigeration pipeline absorbs heat from the cooling medium at the rear-end heat exchanger and vaporizes, and then is transported to the compressor for compression to form a high-temperature liquid. After heat exchange through the condenser, it forms a low-temperature liquid, and then is circulated back to the rear-end heat exchanger to re-absorb heat and vaporize, thus forming a circulating heat exchange.

[0018] Furthermore, the oil temperature control system disclosed in the present invention can also optimize the structure to achieve an integrated form: it includes a main frame, which forms an upper storage space and a lower storage space. The fuel tank, the heating component, and the cooling component are arranged in the upper storage space, and the circulation pump and the oil pumping pump are arranged in the lower storage space. An outer shell is covered on the main frame, and the outer circulation pipeline extends to the outer shell and forms an oil port connector for docking with the motor.

[0019] Furthermore, a heat dissipation structure is formed at the top of the main frame. When the above solution is adopted, the heat dissipation structure cooperates with the refrigeration system, and the condenser of the refrigeration system can be arranged at the heat dissipation structure to assist in heat dissipation and promote the cooling of the refrigeration medium.

[0020] Compared with the prior art, some beneficial effects of the disclosed technical solution of the present invention include:

[0021] The constant-temperature medium oil is transported to the motor through the outer circulation pipeline. The properties of the medium oil are stable and reliable, and can keep the motor running stably. When the operating environment temperature of the motor is different, the temperature of the medium oil can be adjusted through the heating component and the cooling component to meet the temperature environment required by the motor, so as to keep the motor running reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, so it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the overall structure of the temperature control system.

[0024] Figure 2 It is a schematic diagram of the front view structure of the temperature control system.

[0025] Figure 3 It is a schematic structural view of the rear view of the temperature control system.

[0026] Figure 4 It is a schematic overall structure view of the temperature control system after removing the top heat dissipation structure and condenser.

[0027] Figure 5 It is a schematic overall structure view of another perspective of the temperature control system after removing the top heat dissipation structure and condenser.

[0028] Figure 6 It is a process schematic view of the temperature control system.

[0029] In the above-mentioned drawings, the meanings of the respective marks are as follows:

[0030] 1. Main frame; 101. Upper storage space; 102. Lower storage space; 103. Heat dissipation structure; 2. Oil tank; 3. Circulation pump; 4. Oil injection pipeline; 5. Oil return pipeline; 6. Oil extraction pump; 7. Heating tank; 8. Front-end heat exchanger; 9. Cooling pipeline; 10. Rear-end heat exchanger; 11. Conversion valve; 12. Return bypass; 13. Cooling medium tank; 14. Refrigeration pipeline; 15. Compressor; 16. Liquid storage tank; 17. Gas-liquid separator; 18. Oil separator; 19. Condenser; 20. Oil port connector. Detailed implementation manners

[0031] The following further elaborates on this embodiment in conjunction with the drawings and specific embodiments.

[0032] In view of the situation in the prior art that it is difficult to reasonably adjust the temperature of the dielectric oil of the motor, resulting in a change in the temperature of the dielectric oil during the operation of the motor, thus affecting the operation of the motor, the following embodiments are optimized to overcome the defects in the prior art.

[0033] Embodiment

[0034] As Figures 1 to 6 shown, this embodiment provides a temperature control system for the dielectric oil of a motor, including an oil tank 2 for storing dielectric oil. The oil tank 2 is connected to the motor through an external circulation pipeline and conveys dielectric oil for controlling the temperature of the motor. The external circulation pipeline is connected to a heating component and a cooling component. The heating component is used to heat the dielectric oil, and the cooling component is used to cool the dielectric oil.

[0035] The temperature control system disclosed in this embodiment adjusts the temperature of dielectric oil such as engine oil that can enter the interior of the motor, and can keep the temperature of the dielectric oil constant. Thus, during the test operation of the motor, the properties of the dielectric oil are maintained stable, enabling the stable operation of the motor. The heat generated during the operation of the motor can be dissipated outward in a timely manner along with the engine oil, thereby improving the operation reliability of the motor.

[0036] During the process of transporting the medium oil through the external circulation pipeline, it ensures that the medium oil smoothly reaches the motor from the fuel tank 2, and at the same time can smoothly send the medium oil in the motor back to the fuel tank 2 to form a cycle. The external circulation pipeline can adopt various solutions to achieve the above process, and its structure is not uniquely limited. In this embodiment, it is optimized and one feasible option is adopted: as Figure 6 shown, the external circulation pipeline includes an oil injection pipeline 4 and an oil return pipeline 5. A circulation pump 3 for pumping the medium oil to the motor is provided on the oil injection pipeline 4, and a suction pump 6 for pumping the medium oil in the motor back to the fuel tank 2 is provided on the oil return pipeline 5. When adopting the above solution, the circulation pump 3 and the suction pump 6 can adopt vacuum pumps.

[0037] The heating component is used to heat the medium oil to meet the requirement of the motor running at a high temperature. The heating component can adopt various solutions. In this embodiment, it is optimized and one feasible option is adopted: as Figure 6 shown, the heating component includes a heating tank 7. A medium oil pipeline and an electric heating tube are arranged in the heating tank 7. When the electric heating tube is started, the medium oil entering the medium oil pipeline in the heating tank 7 is heated to the set temperature. When adopting the above solution, the medium oil pipeline is arranged in a spiral shape within the heating tube, which can improve the heating effect.

[0038] In order to determine the temperature of the medium oil, a temperature measurement solution can be adopted to measure the temperature of the medium oil. The temperature measurement solution can adopt various structures, and its structure is not uniquely limited. In this embodiment, it is optimized and one feasible option is adopted: as Figure 6 shown, a temperature sensor is also provided at the heating tank 7 for detecting the temperature of the medium oil in the heating tank 7.

[0039] The cooling component is used to cool down the medium oil, so as to meet the requirement of the motor running at a low temperature, avoid the running temperature of the motor from being too high, and keep the motor running stably and reliably. The cooling component can adopt various solutions, and its structure is not uniquely limited. In this embodiment, it is optimized and one feasible option is adopted: as Figures 1 to 6 shown, the cooling component includes a front heat exchanger 8. The front heat exchanger 8 is connected to a rear heat exchanger 10 through a cooling pipeline 9. A cooling medium circulates in the cooling pipeline 9, and the medium oil entering the external circulation pipeline from the fuel tank 2 is cooled down after flowing through the front heat exchanger 8. When adopting the above solution, the front heat exchanger 8 and the rear heat exchanger 10 can adopt plate heat exchangers.

[0040] The heating component and the cooling component adjust the temperature of the dielectric oil in the external circulation pipeline. Only one of them is turned on for operation. The cooling component can be turned on or off by controlling the circulation path of the cooling medium, and its structure is not uniquely defined. In this embodiment, it is optimized and one of the feasible options is adopted: a switching valve 11 is provided on the cooling pipeline 9. When the switching valve 11 is switched to the cooling position, the cooling medium in the cooling pipeline 9 circulates into the front heat exchanger 8. When the switching valve 11 is switched to the rest position, the cooling medium in the cooling pipeline 9 directly returns from the return bypass 12. When the above solution is adopted, the switching valve 11 can be a three-way valve, forming a return bypass 12 on the cooling pipeline 9 at the front heat exchanger 8, and the three-way valve controls the dielectric oil to enter the front heat exchanger 8 for cooling heat exchange, or directly returns through the return bypass 12.

[0041] The rear heat exchanger 10 is used to cool and exchange heat with the cooling medium in the cooling pipeline 9 to ensure that it has sufficient cooling capacity at the front heat exchanger 8. There are various solutions for the setting structure at the rear heat exchanger 10, and its structure is not uniquely defined. In this embodiment, it is optimized and one of the feasible options is adopted: the rear heat exchanger 10 is arranged in the cooling medium tank 13. The cooling medium in the cooling medium tank 13 enters the rear heat exchanger 10 and is cooled to the set temperature. The rear heat exchanger 10 transports the cooling medium to the front heat exchanger 8 through the cooling pipeline 9, and the front heat exchanger 8 is connected to the cooling medium tank 13 through the cooling pipeline 9 and is used to return the heat-exchanged cooling medium. When the above solution is adopted, a corresponding pipeline is provided on the cooling medium tank 13 to communicate with the rear heat exchanger 10, facilitating the transportation of the dielectric oil from the cooling medium tank 13 to the rear heat exchanger 10.

[0042] When specifically exchanging heat with the cooling medium at the rear heat exchanger 10, it can be achieved through various solutions. In this embodiment, one of the feasible options is adopted: the rear heat exchanger 10 is connected to a refrigeration system. The refrigeration system includes a refrigeration pipeline 14, on which a compressor 15 and a condenser 19 are provided. A refrigeration medium circulates in the refrigeration pipeline 14. The refrigeration medium absorbs the heat of the rear heat exchanger 10 and then vaporizes, and after passing through the compressor 15 and the condenser 19, it is re-cooled and liquefied and circulated back to the rear heat exchanger 10. When the above solution is adopted, the refrigeration medium in the refrigeration pipeline 14 absorbs heat and vaporizes with the cooling medium at the rear heat exchanger 10, and then is transported to the compressor 15 for compression to form a high-temperature liquid, and then exchanges heat through the condenser 19 to form a low-temperature liquid, and then circulates back to the rear heat exchanger 10 to re-absorb heat and vaporize, thus forming a cycle of heat exchange.

[0043] The oil temperature control system disclosed in this embodiment can further optimize its structure to achieve an integrated form: It includes a main frame 1, and the main frame 1 forms an upper storage space 101 and a lower storage space 102. The oil tank 2, the heating component and the cooling component are arranged in the upper storage space 101, and the circulation pump 3 and the oil pumping pump 6 are arranged in the lower storage space 102. An outer shell is covered on the main frame 1, and the external circulation pipeline extends to the outer shell and forms an oil port connector 20 for connecting the motor.

[0044] A heat dissipation structure 103 is formed at the top of the main frame 1. When the above scheme is adopted, the heat dissipation structure 103 cooperates with the refrigeration system, and the condenser 19 of the refrigeration system can be arranged at the heat dissipation structure 103 to assist in heat dissipation and promote the cooling of the refrigeration medium.

[0045] The above are the implementation manners listed in this embodiment, but this embodiment is not limited to the above optional implementation manners. Those skilled in the art can arbitrarily combine the above manners to obtain many other implementation manners, and anyone can obtain other various forms of implementation manners under the inspiration of this embodiment. The above specific implementation manners should not be understood as limiting the protection scope of this embodiment, and the protection scope of this embodiment should be defined by the claims.

Claims

1. A motor medium oil temperature control system, characterized in that: The invention comprises an oil tank (2) for storing medium oil, the oil tank (2) being connected to the motor through an external circulation pipeline and conveying medium oil for controlling the temperature of the motor; the external circulation pipeline is connected to a heating component and a cooling component, the heating component is used to heat the medium oil, and the cooling component is used to cool the medium oil.

2. The motor medium oil temperature control system according to claim 1 is characterized in that: The external circulation pipeline comprises an oil injection pipeline (4) and an oil return pipeline (5). The oil injection pipeline (4) is provided with a circulation pump (3) for pumping medium oil to the motor, and the oil return pipeline (5) is provided with an oil pump (6) for pumping medium oil in the motor back to the oil tank (2).

3. The motor medium oil temperature control system according to claim 1 is characterized in that: The heating assembly comprises a heating tank (7), wherein a medium oil pipeline and an electric heating pipe are arranged in the heating tank (7). When the electric heating pipe is started, the medium oil enters the medium oil pipeline in the heating tank (7) and is heated to a set temperature.

4. The motor medium oil temperature control system according to claim 3 is characterized in that: The heating tank (7) is also provided with a temperature sensor for detecting the temperature of the medium oil in the heating tank (7).

5. The motor medium oil temperature control system according to claim 1 is characterized in that: The cooling component comprises a front-end heat exchanger (8), the front-end heat exchanger (8) being connected to a rear-end heat exchanger (10) via a cooling pipeline (9), a cooling medium circulates in the cooling pipeline (9), and the medium oil entering the external circulation pipeline from the oil tank (2) flows through the front-end heat exchanger (8) and is cooled.

6. The motor medium oil temperature control system according to claim 5, characterized in that: A conversion valve (11) is provided on the cooling pipeline (9). When the conversion valve (11) is switched to the cooling position, the cooling medium in the cooling pipeline (9) circulates into the front-end heat exchanger (8). When the conversion valve (11) is switched to the rest position, the cooling medium in the cooling pipeline (9) directly flows back through the reflux bypass (12).

7. The motor medium oil temperature control system according to claim 5, characterized in that: The rear end heat exchanger (10) is arranged in a cooling medium box (13), the cooling medium in the cooling medium box (13) enters the rear end heat exchanger (10) and is cooled to a set temperature, the rear end heat exchanger (10) transports the cooling medium to the front end heat exchanger (8) through a cooling pipeline (9), and the front end heat exchanger (8) is connected to the cooling medium box (13) through a cooling pipeline (9) and is used to return the cooling medium that has undergone heat exchange.

8. The motor medium oil temperature control system according to any one of claims 5 to 7, characterized in that: The rear end heat exchanger (10) is connected to a refrigeration system, which includes a refrigeration pipeline (14). A compressor (15) and a condenser (19) are arranged on the refrigeration pipeline (14). A refrigerant medium circulates in the refrigeration pipeline (14). The refrigerant medium absorbs the heat of the rear end heat exchanger (10) and then vaporizes. After passing through the compressor (15) and the condenser (19), the refrigerant medium is cooled and liquefied again and circulated to the rear end heat exchanger (10).

9. The motor medium oil temperature control system according to claim 2, characterized in that: The invention comprises a main frame (1), wherein the main frame (1) forms an upper storage space (101) and a lower storage space (102), wherein the oil tank (2), the heating component and the cooling component are arranged in the upper storage space (101), and the circulating pump (3) and the oil pump (6) are arranged in the lower storage space (102); the main frame (1) is covered with an outer shell, and the outer circulation pipeline extends to the outer shell and forms an oil port connector (20) for docking with the motor.

10. The motor medium oil temperature control system according to claim 9, characterized in that: A heat dissipation structure (103) is formed on the top of the main frame (1).

Images