Device for evaluating influence of cooling oil on durability of vehicle oil-cooled motor insulation system

Abstract

The invention belongs to the technical field of new energy automobile driving motors, and particularly relates to a device for evaluating the influence of cooling oil on the durability of an oil cooling motor insulation system for a vehicle. Comprising a storage and temperature control module; a spraying assembly and an oil cooling motor insulation system simulation structure are arranged in the double-temperature aging experiment platform, the spraying assembly comprises an annular wrapping type sprayer and two submersible type self-rotating spraying terminals, and the spraying assembly is connected with the oil cooling circulation module; the two submerged self-rotating spraying terminals are oppositely arranged in the annular wrapping type sprayer, and the opposite sides of the two submerged self-rotating spraying terminals are each provided with an oil-cooled motor insulation system simulation structure. And a heat exchange module. According to the invention, the thermodynamic situation of the oil-cooled driving motor of the new energy automobile under the actual working condition can be simulated, the influence of cooling oil is considered, and the durability of the insulation system is evaluated more accurately.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle drive motors, and in particular relates to a device for evaluating the influence of cooling oil on the durability of an insulation system of an oil-cooled motor for a vehicle. Background Art

[0002] In new energy vehicles, the dynamic characteristics and reliability of the motor are one of the core elements. With the rapid development of the new energy vehicle industry in recent years, oil-cooled drive motors have been widely used due to their high power density and good heat dissipation effect. The insulation system of the motor is a key part to ensure its normal operation, and the durability of the insulation system directly affects the life and safety of the motor. The durability assessment of the insulation system of the oil-cooled drive motor is an important part to ensure the safe operation of new energy vehicles. Generally speaking, during long-term operation, the insulation system of the motor will gradually age due to factors such as high temperature, mechanical stress and chemical corrosion, affecting the reliability and life of the motor.

[0003] However, traditional insulation system durability assessment methods usually fail to fully simulate the thermodynamic scenarios in actual work, especially the impact of cooling oil on insulation materials and insulation systems in oil-cooled systems. Most existing insulation system durability assessment methods fail to fully consider the impact of cooling oil and cannot truly simulate actual operating conditions, resulting in large differences between the assessment results and actual operating conditions, and therefore inaccurate assessments. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an evaluation device for the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle. The device can simulate the temperature field distribution of the oil-cooled drive motor of a new energy vehicle under actual working conditions, while taking into account the effect of the cooling oil, and more accurately evaluate the durability of the insulation system. When using this evaluation device to evaluate the insulation system of a spray-type direct oil-cooled motor, the effect of cooling oil and its complex additives on the durability of the insulation system under long-term high temperature conditions can be examined in detail. This evaluation can reveal how cooling oils of different types and compositions affect the aging process of insulating materials, thereby providing more accurate data to predict the service life and stability of the motor. Such in-depth analysis helps to optimize the design of the insulation system, select a cooling oil and additive combination that is more suitable for long-term use, and thereby improve the overall reliability and safety of new energy vehicle drive motors.

[0005] The present invention solves the above technical problems through the following technical solutions.

[0006] The object of the present invention is to provide a device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle, comprising: The storage and temperature control module is used to store the cooling oil and heat the cooling oil to a preset temperature to form circulating oil, and then transport the circulating oil to the dual-temperature aging experimental platform through the oil cooling circulation module.

[0007] The dual-temperature aging test platform is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The dual-temperature aging test platform is equipped with a spray assembly and two simulated structures of the oil-cooled motor insulation system. The spray assembly includes a ring-wrapped sprayer and two submerged self-rotating spray terminals. The spray assembly is connected to the oil-cooling circulation module; the two submerged self-rotating spray terminals are relatively arranged inside the ring-wrapped sprayer, and an oil-cooled motor insulation system simulation structure is respectively provided on the opposite sides of the two submerged self-rotating spray terminals. The ring-wrapped sprayer uses the circulating oil transported by the oil-cooling circulation module to spray the outside of the two oil-cooled motor insulation system simulation structures, and each submerged self-rotating spray terminal uses the circulating oil transported by the oil-cooling circulation module to spray the inside of an oil-cooled motor insulation system simulation structure, so as to realize the oil-cooling circulation environment when the motor is simulated.

[0008] The heat exchange module is used to cool the circulating oil output by the dual-temperature aging experimental platform to form cooling oil, and transport the cooling oil to the storage and temperature control module.

[0009] Furthermore, the above-mentioned evaluation device for the influence of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the ring-wrapped sprayer includes a U-shaped tube and two ring-wrapped spray terminals, the inlet of the U-shaped tube is connected to the oil cooling circulation module, a sample rack is provided on the inner wall of the U-shaped tube away from the oil cooling circulation module, and two oil-cooled motor insulation system simulation structures are symmetrically arranged at the upper and lower ends of the sample rack; the two ring-wrapped spray terminals are symmetrically arranged on the two horizontal ends of the U-shaped tube along the axial direction of the sample rack, and the two oil-cooled motor insulation system simulation structures are respectively located in the space formed by each ring-wrapped spray terminal; the inner wall of each ring-wrapped spray terminal is connected to a submerged self-rotating spray terminal, and the two submerged self-rotating spray terminals are symmetrically distributed, respectively located above and below the sample rack.

[0010] Furthermore, in the above-mentioned evaluation device for the effect of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, each ring-wrapped spray terminal includes a horizontal spray terminal, two inclined spray terminals and two vertical spray terminals. The middle of the inner wall of the horizontal spray terminal is connected to a ring-wrapped sprayer, and the upper end of each vertical spray terminal is connected to the horizontal spray terminal. The highest inclined ends of the two inclined spray terminals are correspondingly connected to the two ends of the horizontal spray terminal, and the lowest inclined end of each inclined spray terminal is correspondingly connected to a vertical spray terminal. The two inclined spray terminals and the two vertical spray terminals are distributed in a symmetrical structure with the ring-wrapped sprayer as the axis.

[0011] Furthermore, the above-mentioned device for evaluating the impact of the cooling oil on the durability of the oil-cooled motor insulation system of an automotive oil-cooled motor, the horizontal spray terminal includes a connecting channel and a spray plate, one end of the connecting channel is correspondingly connected to a horizontal end of the U-shaped tube, and the other end of the connecting channel is connected to the spray plate, the spray direction of the spray plate is toward the oil-cooled motor insulation system simulation structure, and is used to spray the outside of the coil of the oil-cooled motor insulation system simulation structure.

[0012] Furthermore, the above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled automotive motor, the spray disc has multiple annular baffles arranged from the inside to the outside, all the annular baffles are concentric and arranged with equal gradients in the radial direction, one end of all the annular baffles close to the inner wall of the spray disc and the inner wall of the spray disc are connected by a connecting rod, an annular space is formed between adjacent annular baffles, the innermost annular space is provided with an outlet pipe, the outlet pipe is connected to the submerged self-rotating spray terminal; an annular circulation groove is provided between the lower end of all the annular baffles and the bottom wall of the spray disc, the annular circulation groove is connected to the connecting channel, the annular circulation groove is used to circulate circulating oil to all annular spaces; a cover is slidably provided on the spray disc, and a plurality of spray holes are evenly distributed on the part of the cover located in the annular space.

[0013] Furthermore, in the above-mentioned device for evaluating the influence of cooling oil on the durability of the insulation system of an oil-cooled automotive motor, the lower end side walls of the cover are each provided with a U-shaped groove and a second L-shaped plate, the second L-shaped plate includes a second vertical plate and a second horizontal plate, the upper end of the second vertical plate is connected to the lower end wall of the cover, the lower end is connected to one end of the second horizontal plate, and the other end of the second horizontal plate is connected to one end of the U-shaped groove; the symmetrical side walls on the spray plate are each provided with a first L-shaped plate, the first L-shaped plate includes a first vertical plate and a first horizontal plate, one end of the first horizontal plate is connected to the inner wall of the spray plate, and the other end is connected to the upper end of the first vertical plate, and the lower end of the first vertical plate is slidably arranged in the U-shaped groove.

[0014] Furthermore, in the above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, a first arc-shaped groove is provided on both inner walls of the U-shaped groove, and a second arc-shaped groove corresponding to the first arc-shaped groove is provided on the outer wall of the first vertical plate. The first arc-shaped groove and the second arc-shaped groove are symmetrical about the axis and form a fixing hole. The fixing hole is provided with a threaded groove, and a T-type screw is screwed on each fixing hole.

[0015] Furthermore, in the above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the inclined spray terminal and the vertical spray terminal both include a connecting channel and a spray plate, the spray plate has multiple annular partitions arranged from the inside to the outside, all the annular partitions are concentric and arranged with equal gradients in the radial direction, an annular space is formed between adjacent annular partitions, the innermost annular space is provided with a square spray port, and multiple spray holes are evenly distributed on the partial cover located at the square spray port.

[0016] Furthermore, in the above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, each of the submersible self-rotating spray terminals includes an oil delivery pipeline, an oil-throwing chamber and a plurality of atomizing nozzles, the upper end of the oil delivery pipeline is connected to the outlet pipe, and the lower end is connected to the oil-throwing chamber, and the plurality of atomizing nozzles are evenly arranged on the outer wall of the oil-throwing chamber along the radial direction of the oil-throwing chamber.

[0017] Furthermore, the above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled automotive motor has a plurality of first guide baffles and a plurality of second guide baffles arranged in the oil-throwing chamber along the circumferential direction of the oil-throwing chamber, and at least two second guide baffles are arranged between adjacent first guide baffles.

[0018] Furthermore, in the above-mentioned device for evaluating the influence of cooling oil on the durability of the insulation system of an automotive oil-cooled motor, the dual-temperature aging chamber is provided with a pressure sensor, a temperature sensor mounting seat, a safety valve and an oil outlet, the pressure sensor is used to detect the pressure in the dual-temperature aging chamber, and feed back the pressure signal to the oil cooling circulation system processing and control platform; the temperature sensor is used to detect the average temperature inside the dual-temperature aging chamber, and feed back the temperature signal to the oil cooling circulation system processing and control platform; the safety valve is used to ensure that the pressure in the dual-temperature aging chamber does not exceed the critical dangerous pressure limit; the oil outlet is connected to the cooling oil heat exchange module.

[0019] Furthermore, in the device for evaluating the effect of the cooling oil on the durability of the insulation system of an oil-cooled automotive motor, the storage and temperature control module comprises an oil storage tank and a ceramic heating shell, the oil storage tank is located inside the ceramic heating shell, the upper end of the oil storage tank is connected to the heat exchange module, and the lower end is connected to the oil cooling circulation module.

[0020] Furthermore, the above-mentioned evaluation device for the influence of cooling oil on the durability of the oil-cooled motor insulation system of an automobile also includes an oil cooling circulation system processing and control platform, which includes a controller, a temperature control module and a visual display module. The various operating data of the temperature control module, the oil cooling circulation module, the dual-temperature aging experiment platform and the cooling oil heat exchange module during operation are set through the visual display module. The controller and the temperature control module collect various operating data, process the data through preset algorithms and analysis models, and transmit the processed data to the temperature control module, the oil cooling circulation module, the dual-temperature aging experiment platform and the cooling oil heat exchange module through the controller, so as to regulate the precise operation of various data of the temperature control module, the oil cooling circulation module, the dual-temperature aging experiment platform and the cooling oil heat exchange module, so as to realize the oil cooling circulation environment when simulating the motor operation, and ensure that the oil-cooled motor insulation system can comprehensively and accurately evaluate the durability performance of the simulated structure of the oil-cooled motor insulation system.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (7) The device for evaluating the effect of cooling oil on the durability of the oil-cooled motor insulation system of a vehicle provided by the present invention uses a storage and temperature control module to store the cooling oil and heat the cooling oil to a preset temperature to form circulating oil, and then transports the circulating oil to a dual-temperature aging test platform through the oil-cooling circulation module. The dual-temperature aging test platform is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The cooling oil is then transported to the storage and temperature control module to form a cyclic test durability evaluation, wherein a spray assembly provided in the dual-temperature aging test platform uses a ring-wrapped sprayer to spray the outer side of the simulated structure of the oil-cooled motor insulation system, and two submerged self-rotating spray terminals are used to spray the inner side of the simulated structure of the oil-cooled motor insulation system. The combination of the two groups of spray terminals realizes all-round, multi-angle, and three-dimensional spray cooling of the experimental object, ensuring accurate and sufficient contact between the cooling oil and the simulated structure of the insulation system, which is beneficial to improving the accuracy of the durability evaluation of the cooling oil on the oil-cooled motor insulation system.

[0022] (8) The present invention uses the device to conduct dual-temperature thermal aging tests to fully simulate the temperature difference between the cooling oil and the drive motor insulation system. The device can simulate the temperature field distribution of the oil-cooled drive motor of a new energy vehicle under actual working conditions, taking into account the influence of the cooling oil, and more accurately evaluate the durability of the insulation system. When using this evaluation device to evaluate the insulation system of a spray-type direct oil-cooled motor, it is possible to detect in detail the influence of the cooling oil and its complex additives on the durability of the insulation system under long-term high temperature conditions, and has the advantages of accurate evaluation results, good repeatability, and high evaluation efficiency. This evaluation can reveal how cooling oils of different types and compositions affect the aging process of insulating materials, thereby providing more accurate data to predict the service life and stability of the motor. Such in-depth analysis helps to optimize the design of the insulation system, select cooling oils and additives that are more suitable for long-term use, and thus improve the overall reliability and safety of new energy vehicle motors.

[0023] (3) The present invention can effectively evaluate the durability of the insulation system of the oil-cooled drive motor of new energy vehicles, thereby providing a scientific basis for the design optimization, material selection and life prediction of the motor, and further providing a reliable reference for the research and development and production of the motor. It has rich potential for expansion and can adjust the pressure, flow rate, flow velocity and oil type of the spray system, providing experimental verification reference, evaluation and guidance for the design of oil-cooled motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the durability evaluation device for the insulation system of an oil-cooled drive motor of the present invention.

[0025] Figure 2It is a structural schematic diagram of the storage and temperature control module of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the ring-wrapped sprinkler of the present invention.

[0027] Figure 4 It is a partial structural schematic diagram of the ring-wrapped sprinkler of the present invention.

[0028] Figure 5 It is a partial structural schematic diagram of the horizontal spray terminal of the present invention.

[0029] Figure 6 It is a schematic diagram of the overall structure of the horizontal spray terminal of the present invention.

[0030] Figure 7 It is a schematic cross-sectional structural diagram of the horizontal spray terminal of the present invention.

[0031] Figure 8 It is a schematic diagram of the top view and cross-section structure of the horizontal spray terminal of the present invention.

[0032] Fig. 9 It is a schematic diagram of the connection structure between the cover and the spray plate of the horizontal spray terminal of the present invention.

[0033] Fig.10 It is a schematic diagram of the cross-sectional structure of the cover of the horizontal spray terminal of the present invention.

[0034] Fig.11 It is a schematic structural diagram of the T-screw of the present invention.

[0035] Fig.12 It is a partial structural schematic diagram of the inclined spray terminal or the vertical spray terminal of the present invention.

[0036] Fig.13 It is a schematic cross-sectional structure diagram of the inclined spray terminal or the vertical spray terminal of the present invention.

[0037] Fig.14 It is a structural schematic diagram of the submersible self-rotating spray terminal of the present invention.

[0038] Fig.15 It is a schematic structural diagram of the first guide baffle and the second guide baffle in the oil-throwing chamber of the present invention.

[0039] Fig.16 The present invention is a flow chart of the heat resistance evaluation and classification experiment of the dual-temperature aging method. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that the professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, the various raw materials, reagents, instruments and equipment used in the following embodiments of the present invention can be purchased from the market or prepared by existing methods.

[0042] Most of the traditional insulation system durability assessment methods fail to fully consider the impact of cooling oil, especially the impact of cooling oil on insulation materials and insulation systems in oil-cooled systems, and cannot truly simulate actual operating conditions and thermodynamic scenarios, resulting in large differences between the assessment results and actual operating conditions, and therefore inaccurate assessment problems. Therefore, the development of a new oil-cooled drive motor insulation system durability assessment device has important practical significance. At the same time, accurately assessing the durability of the motor insulation system under oil-cooling conditions is not only crucial to ensuring the reliability of the motor and extending its service life, but also has far-reaching significance for improving the safety and reliability of new energy vehicles.

[0043] Based on the above problems, the present invention provides a device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle. Figure 1 As shown, including: The storage and temperature control module 2 is used to store the cooling oil and heat the cooling oil to a preset temperature to form circulating oil, and transport the circulating oil to the dual-temperature aging experimental platform 4 through the oil cooling circulation module 3.

[0044] The dual-temperature aging test platform 4 is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The dual-temperature aging test platform 4 is provided with a spray assembly 42 and two oil-cooled motor insulation system simulation structures 6. The spray assembly 42 includes a ring-wrapped sprayer 421 and two submerged self-rotating spray terminals 422. The spray assembly 42 is connected to the oil-cooling circulation module 3; the two submerged self-rotating spray terminals 422 are relatively arranged inside the ring-wrapped sprayer 421, and an oil-cooled motor insulation system simulation structure 6 is respectively provided on the opposite side of the two submerged self-rotating spray terminals 422. The ring-wrapped sprayer 421 uses the circulating oil delivered by the oil-cooling circulation module 3 to spray the outside of the two oil-cooled motor insulation system simulation structures 6, and each submerged self-rotating spray terminal 422 uses the circulating oil delivered by the oil-cooling circulation module 3 to spray the inside of an oil-cooled motor insulation system simulation structure 6, so as to realize the oil-cooling circulation environment when the motor is running.

[0045] The heat exchange module 5 is used to cool the circulating oil output from the dual-temperature aging experimental platform 4 to form cooling oil, and transport the cooling oil to the storage and temperature control module 2 .

[0046] The present invention utilizes the storage and temperature control module 2 to store the cooling oil and heats the cooling oil to a preset temperature to form circulating oil, and transports the circulating oil to the dual-temperature aging test platform 4 through the oil-cooling circulation module 3. The dual-temperature aging test platform 4 is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system, wherein the simulated structure of the oil-cooled motor insulation system and the cooling oil are continuously operated at two different temperatures, and the circulating oil that has completed the heat exchange with the simulated structure 6 of the oil-cooled motor insulation system is cooled by the heat exchange module 5 to form cooling oil and transported to the storage and temperature control module 2, so as to form a durability evaluation of the simulated structure 6 of the oil-cooled motor insulation system. The present invention utilizes the device to perform dual-temperature thermal aging tests to fully simulate the temperature difference between the cooling oil and the drive motor insulation system. The device can simulate the temperature field distribution of the oil-cooled drive motor of a new energy vehicle under actual working conditions, consider the influence of the cooling oil, and more accurately evaluate the durability of the insulation system. When using this evaluation device to evaluate the insulation system of a spray-type direct oil-cooled motor, it is possible to detect in detail the effects of cooling oil and its complex additives on the durability of the insulation system under long-term high temperature conditions, with the advantages of accurate evaluation results, good repeatability, and high evaluation efficiency. This evaluation can reveal how different types and compositions of cooling oil affect the aging process of insulating materials, thereby providing more accurate data to predict the service life and stability of the motor. Such in-depth analysis helps to optimize the design of the insulation system and select a combination of cooling oil and additives that is more suitable for long-term use, thereby improving the overall reliability and safety of new energy vehicle drive motors.

[0047] The invention is further described below through specific examples.

[0048] Example 1 An evaluation device for the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle, such as Figure 1 to Figure 15 As shown, including: The storage and temperature control module 2 is used to store the cooling oil and heat the cooling oil to a preset temperature to form circulating oil, and transport the circulating oil to the dual-temperature aging experimental platform 4 through the oil-cooling circulation module 3; the dual-temperature aging experimental platform 4 is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the simulated structure of the oil-cooled motor insulation system. The dual-temperature aging experimental platform 4 is provided with a spray assembly 42 and two oil-cooled motor insulation system simulation structures 6. The spray assembly 42 includes a ring-wrapped sprayer 421 and two submersible self-rotating spray terminals 422. The spray assembly 42 is connected to the oil-cooling circulation module 3; the two submersible self-rotating spray terminals 422 are arranged relatively to each other. Inside the ring-wrapped sprayer 421, an oil-cooled motor insulation system simulation structure 6 is respectively provided on the opposite side of the two submerged self-rotating spray terminals 422. The ring-wrapped sprayer 421 uses the circulating oil delivered by the oil-cooling circulation module 3 to spray the outside of the two oil-cooled motor insulation system simulation structures 6, and each submerged self-rotating spray terminal 422 uses the circulating oil delivered by the oil-cooling circulation module 3 to spray the inside of an oil-cooled motor insulation system simulation structure 6, so as to realize the oil-cooling circulation environment when simulating the motor operation; the heat exchange module 5 is used to cool the circulating oil output by the dual-temperature aging experimental platform 4 to form cooling oil, and transport the cooling oil to the storage and temperature control module 2. The oil cooling circulation system processing and control platform 1 is used to collect various operating data during the operation of the storage and temperature control module 2, the oil cooling circulation module 3, the dual-temperature aging experiment platform 4 and the cooling oil heat exchange module 5 during the durability performance test, process the data through the preset algorithm and analysis model, and transmit the processed data to the temperature control module 2, the oil cooling circulation module 3, the dual-temperature aging experiment platform 4 and the cooling oil heat exchange module 5 through the controller, control the temperature control module 2, the oil cooling circulation module 3, the dual-temperature aging experiment platform 4 and the cooling oil heat exchange module 5 to accurately operate the various data, so as to simulate the oil cooling circulation environment when the motor is running, so as to ensure a comprehensive and accurate evaluation of the durability performance of the oil-cooled motor insulation system simulation structure 6.

[0049] Among them, the oil cooling circulation module 3 is an oil pump, the dual-temperature aging experimental platform 4 includes a dual-temperature aging chamber 41, the spray assembly 42 is arranged in the dual-temperature aging chamber 41, the dual-temperature aging chamber 41 is a dual-temperature aging tank, the dual-temperature aging chamber 41 is provided with a pressure sensor mounting seat 411, a temperature sensor mounting seat 412, a safety valve 413 and an oil outlet 414, the pressure sensor mounting seat 411 is arranged above the dual-temperature aging tank, a pressure sensor is arranged in the pressure sensor mounting seat 411, and the temperature sensor mounting seat 412 is arranged on the side of the dual-temperature aging tank. The sensor mounting seat 412 is used to set the temperature sensor, the pressure sensor 411 is used to detect the pressure in the dual-temperature aging chamber 41, and feed back the pressure signal to the oil cooling circulation system processing and control platform 1; the temperature sensor is used to monitor the temperature in the dual-temperature aging chamber 41 and the temperature of the oil-cooled motor insulation system simulation structure 6 in the dual-temperature aging chamber 41, and feed back the temperature signal to the oil cooling circulation system processing and control platform 1; the safety valve 413 is used to ensure that the pressure in the dual-temperature aging chamber 41 does not exceed the critical pressure limit; the oil circuit outlet 414 is connected to the cooling oil heat exchange module 5.

[0050] Among them, the pressure sensor is an electronic pressure sensor, which detects the gas pressure in the dual-temperature aging tank. When the internal pressure of the dual-temperature aging tank exceeds the specified value, the safety valve 413 will automatically open, and part of the gas in the dual-temperature aging tank will be discharged into the atmosphere, so that the pressure inside the dual-temperature aging tank will not exceed the allowable value, thereby ensuring that the entire device will not cause an accident due to excessive pressure. The temperature sensor mounting seat 412 is used to arrange a temperature sensor for real-time temperature monitoring of the oil-cooled motor insulation system simulation structure 6. The temperature sensor used is a K-type thermocouple, which is used to measure and monitor the real-time temperature of the cold cycle oil-cooled motor insulation system simulation structure 6 and the cooled cooling oil (automatic transmission fluid).

[0051] In the present invention, the oil-cooled motor insulation system simulation structure 6 is a flat wire stator or round wire stator insulation system model. In the present embodiment, the oil-cooled motor insulation system simulation structure 6 is a flat wire stator insulation system model. The oil-cooled motor insulation system simulation structure 6 is placed in the dual-temperature aging experiment platform 4. The oil-cooled motor insulation system simulation structure 6 is passed through the amplified current through the oil-cooled circulation system processing and control platform 1. The Joule effect is used to heat the oil-cooled motor insulation system simulation structure 6 to a first preset temperature. The second heating temperature of the cooling oil in the storage and temperature control module 2 is set through the oil-cooled circulation system processing and control platform 1. The delivery flow of the oil-cooled circulation module 3, the temperature and pressure in the dual-temperature aging experiment platform 4, when each data reaches the set value, the oil-cooled circulation module 3 is turned on through the oil-cooled circulation system processing and control platform 1. The oil-cooling circulation module 3 transports the circulating oil to the dual-temperature aging test platform 4, and sprays the two oil-cooled motor insulation system simulation structures 6, wherein the ring-wrapped sprayer 421 is used to spray the outer side of the coils of the two oil-cooled motor insulation system simulation structures 6, and each submerged self-rotating spray terminal 422 is used to spray the inner side of the coil of an oil-cooled motor insulation system simulation structure 6, so as to simulate the oil-cooling circulation environment when the motor is running, and perform durability test on the oil-cooled motor insulation system simulation structure 6. After the spraying, the circulating oil is subjected to air-cooling heat exchange in the oil heat exchange module 5, and then cooled to form cooling oil, and the cooling oil is transported to the storage and temperature control module 2, and after being heated by the storage and temperature control module 2, it is further transported to the dual-temperature aging test platform 4 through the cold circulation module 3 to form a cycle. This process can truly simulate the cooling method of the oil-cooled drive motor winding insulation system, which helps to deeply understand and quantify the potential impact of the cooling oil composition on the motor insulation performance, thereby providing a scientific basis for optimizing motor design and selecting a suitable cooling oil formula.

[0052] In a specific embodiment, the dual-temperature aging tank is also provided with a main power interface, which is used to power the model coil and use the Joule effect to heat the model coil to a first preset temperature. The dual-temperature aging tank and the cooling oil heat exchange module 5 are connected through an oil return pipeline, and an oil return valve is provided on the oil return pipeline. The oil return valve is used to timely transport the cooling oil after spraying from the inside of the dual-temperature aging tank through the cooling oil heat exchange module 5 back to the storage and temperature control module 2.

[0053] In a specific embodiment, the dual-temperature aging tank body is made of stainless steel 304 seamless pipes welded and processed, and can withstand pressure of more than 6 atmospheres when heated to a high temperature of 300°C. The flange end cover plate has an injection pipe mounting flange and an oil drain pipe connection, and a heat insulation shield is installed outside the dual-temperature aging cavity to ensure that the temperature inside the tank minimizes heat loss.

[0054] In a specific embodiment, Figure 3 and Figure 4As shown, the ring-wrapped sprayer 421 includes a U-shaped tube 423 and two ring-wrapped spray terminals 424, the inlet of the U-shaped tube 423 is connected to the oil-cooling circulation module 3, a sample rack 61 is provided on the inner wall of the U-shaped tube 423 away from the oil-cooling circulation module 3, and two oil-cooled motor insulation system simulation structures 6 are symmetrically arranged at the upper and lower ends of the sample rack 61; the two ring-wrapped spray terminals 424 are symmetrically arranged on the two horizontal ends of the U-shaped tube 423 along the axial direction of the sample rack 61, and the two oil-cooled motor insulation system simulation structures 6 are respectively located in the space formed by each ring-wrapped spray terminal 424; the inner wall of each ring-wrapped spray terminal 424 is connected to a submerged self-rotating spray terminal 422, and the two submerged self-rotating spray terminals 422 are symmetrically located above and below the sample rack 61. A ring-wrapped spray terminal 424 on the U-shaped tube 423 and a submerged self-rotating spray terminal 422 connected to the inner wall of the ring-wrapped spray terminal 424 are located above or below the sample rack 61, forming a ring-wrapped corresponding oil-cooled motor insulation system simulation structure 6, spraying the outer side and inner side of the coil of the oil-cooled motor insulation system simulation structure 6, forming a full-range, multi-angle, dynamic and static combined spray pipeline for the oil-cooled motor insulation system simulation structure 6, which can make the cooling oil and the insulation system simulation structure in a spray state more comprehensive and full contact, so as to more effectively obtain information on the influence of the cooling oil on the insulation material and insulation system of the vehicle oil-cooled drive motor. It should be noted that a sample rack 61 is provided on the inner wall of the U-shaped tube 423 away from the side of the oil-cooled circulation module 3, and the sample rack 61 is used to load the oil-cooled motor insulation system simulation structure 6. Two oil-cooled motor insulation system simulation structures 6 are detachably arranged above and below the sample rack 61, and the detachable arrangement method includes screw connection, clamping connection, etc. In this embodiment, the detachable arrangement method is screw connection.

[0055] In a specific embodiment, Figure 4As shown, each ring-wrapped spray terminal 424 includes a horizontal spray terminal 425, two inclined spray terminals 426 and two vertical spray terminals 427. The middle of the inner wall of the horizontal spray terminal 425 is connected to a ring-wrapped sprayer 421, and the highest inclined ends of the two inclined spray terminals 426 are correspondingly connected to the two ends of the horizontal spray terminal 425. The lowest inclined end of each inclined spray terminal 426 is correspondingly connected to a vertical spray terminal 427. The two inclined spray terminals 426 and the two vertical spray terminals 427 are distributed in a symmetrical structure with the ring-wrapped sprayer 421 as the axis. A ring-shaped spray terminal 424 is formed by a horizontal spray terminal 425, two inclined spray terminals 426 and two vertical spray terminals 427, and the spraying directions of the horizontal spray terminal 425, the two inclined spray terminals 426 and the two vertical spray terminals 427 are all toward the oil-cooled motor insulation system simulation structure 6, and the oil-cooled motor insulation system simulation structure 6 is sprayed in all directions, multi-angles, and dynamic and static combined.

[0056] In a specific embodiment, Figures 5 to 8 As shown, the horizontal spray terminal 425 includes a connecting channel 4251 and a spray plate 4252. One end of the connecting channel 4251 is correspondingly connected to a horizontal end of the U-shaped tube 423, and the other end of the connecting channel 4251 is connected to the spray plate 4252. The spray direction of the spray plate 4252 is toward the oil-cooled motor insulation system simulation structure 6, which is used to spray the outside of the coil of the oil-cooled motor insulation system simulation structure 6. The inlet of the U-shaped tube 423 is connected to the outlet of the oil-cooling circulation module 3, and is used to transport the circulating oil delivered by the cooling circulation module 3 to the connecting channel 4251, and enter the spray plate 4252 through the connecting channel 4251. The spray plate 4252 sprays the outer side of the coil of the oil-cooled motor insulation system simulation structure 6. In this embodiment, the U-shaped tube 423 and the oil-cooling circulation module 3 are connected through an oil injection pipeline. The oil injection pipeline is a stainless steel welded seal to ensure that there is no leakage. The two horizontal ends of the U-shaped tube 423 are connected to the spray plate 4252, and the spray direction of all spray plates 4252 is toward the oil-cooled motor insulation system simulation structure 6.

[0057] In a specific embodiment, Figures 5 to 8As shown, the spray plate 4252 is provided with a plurality of annular baffles 4253 from the inside to the outside, all the annular baffles 4253 are concentric and arranged with equal gradients in the radial direction, one end of all the annular baffles 4253 close to the inner wall of the spray plate 4252 is connected to the inner wall of the spray plate 4252 by a connecting rod, and all the annular baffles 4253 are fixed by the spray plate 4252, and an annular space is formed between adjacent annular baffles 4253, and the innermost annular space is provided with an outlet pipe 42531 , the outlet pipe 42531 is connected to the submerged self-rotating spray terminal 422; an annular circulation groove 4254 is provided between the lower end of all the annular partitions 4253 and the bottom wall of the spray plate 4252, the annular circulation groove 4254 is connected to the connecting channel 4251, and the annular circulation groove 4254 is used to circulate circulating oil to all annular spaces; a sealing cover 4256 is slidingly provided on the spray plate 4252, and a plurality of spray holes 4255 are evenly distributed on the part of the sealing cover 4256 located in the annular space. A connecting rod is used to connect the end of all the annular partitions 4253 close to the inner wall of the spray plate 4252 and the inner wall of the spray plate 4252, and all the annular partitions 4253 are fixed in the spray plate 4252 by the connecting rod. It should be noted that, Figure 7 As shown, the height of the connecting channel 4251 is smaller than the height of the spray plate 4252, and a sliding groove is provided at the connecting end of the connecting channel 4251 and the spray plate 4252. The cover 4256 is slidably connected to the spray plate 4252 through the sliding groove, and a sealing plate is provided at the contact end of the cover 4256 and the sliding groove, and a stable sealing space can be formed between the sealing plate and the sliding groove.

[0058] After the circulating oil enters the U-shaped tube 423, the oil cooling circulation module 3 enters the corresponding spray plate 4252 through the connecting channel 4251, and then gradually enters each annular partition 4253 through the annular flow groove 4254 to form an annular space, which is used to make the circulating oil quickly and in large quantities enter the spray component and then be divided into different spray intervals by the internal block, and the innermost annular space is set with equal gradient from the outer annular space. The circulating oil first fills the inner annular space, and then gradually fills the innermost annular space to the outermost annular space, and passes through all the sprays in the annular space. The spray holes 4255 spray the circulating oil toward the oil-cooled motor insulation system simulation structure 6, and all the spray holes 4255 are directed toward the oil-cooled motor insulation system simulation structure 6. In the present embodiment, the diameter of the spray holes 4255 is 0.3 mm to 0.8 mm, and at least 100 of the above-mentioned spray holes 4255 are axially arranged on each annular space, which are used to spray cooling oil on the outside of the coil of the oil-cooled motor insulation system simulation structure 6, thereby realizing all-round, multi-angle, dynamic and static combined spraying of the oil-cooled motor insulation system simulation structure 6 of the oil-cooled motor insulation system.

[0059] In a specific embodiment, Fig. 9 and Fig.10 As shown, the lower end side walls of the cover 4256 are each provided with a U-shaped groove 4257 and a second L-shaped plate 4258, the second L-shaped plate 4258 includes a second vertical plate and a second horizontal plate, the upper end of the second vertical plate is connected to the lower end wall of the cover 4256, the lower end is connected to one end of the second horizontal plate, and the other end of the second horizontal plate is connected to one end of the U-shaped groove 4257; the symmetrical side walls on the spray plate 4252 are each provided with a first L-shaped plate 4259, the first L-shaped plate 4259 includes a first vertical plate and a first horizontal plate, one end of the first horizontal plate is connected to the inner wall of the spray plate 4252, and the other end is connected to the upper end of the first vertical plate, and the lower end of the first vertical plate is slidably set in the U-shaped groove 4257. The present invention slides the first vertical plate in the U-shaped groove 4257, and then slides the cover 4256 onto the spray plate 4252, and a sealing strip is provided at the sliding position to prevent leakage of circulating oil, thereby achieving rapid and convenient disassembly of the cover 4256 for cleaning the spray terminal and reducing clogging during long-term use of the spray terminal.

[0060] In a specific embodiment, Fig.10 and Fig.11 As shown, the two inner walls of the U-shaped groove 4257 are provided with a first arc groove 42581, and the outer wall of the first vertical plate is provided with a second arc groove 42582 corresponding to the first arc groove 42581. The first arc groove 42581 and the second arc groove 42582 are axially symmetrically distributed and form a fixing hole, and the fixing hole is provided with a threaded groove, and each fixing hole is rotatably provided with a T-shaped screw 42583. After the cover 4256 is slidably arranged on the outermost annular partition 4253, it is screwed into the fixing hole through the T-shaped screw 42583, wherein the threaded groove provided in the fixing hole matches the thread of the T-shaped screw 42583, and the fixing holes are arranged in a staggered manner, so that the cover 4256 is easy to disassemble and clean, and prevents some spray holes 4255 from being blocked due to long-term use. At the same time, the threaded groove design on the T-shaped screw 42583 increases the path length, further reducing the probability of cooling oil leakage, and the T-shaped handle at the end is convenient for operators to operate directly without the help of external operating tools.

[0061] In a specific embodiment, Figure 12-13As shown, the inclined spray terminal 426 and the vertical spray terminal 427 both include a connecting channel 4251 and a spray plate 4252. The spray plate 4252 has a plurality of annular baffles 4253 arranged from the inside to the outside. All the annular baffles 4253 are concentric and arranged with equal gradients in the radial direction. An annular space is formed between adjacent annular baffles 4253. A square spray port 428 is provided in the innermost annular space. A plurality of spray holes 4255 are evenly distributed on the partial cover 4256 located at the square spray port 428. In the present invention, the inclined spray terminal 426, the vertical spray terminal 427 and the horizontal spray terminal 425 have the same structure. The connecting channel 4251 on the inclined spray terminal 426 and the vertical spray terminal 427 is connected to the annular circulation groove 4254 on the spray plate 4252. The annular circulation groove 4254 is used to circulate circulating oil to all annular spaces on the inclined spray terminal 426 and the vertical spray terminal 427. A square spray port 428 is provided in the innermost annular space on the inclined spray terminal 426 and the vertical spray terminal 427. The square spray port 428 is used to spray the outer side of the coil on the side of the oil-cooled motor insulation system simulation structure 6. Through the structural design of the horizontal spray terminal 425, the inclined spray terminal 426 and the vertical spray terminal 427, cooling oil is sprayed on the outer side of the coil of the oil-cooled motor insulation system simulation structure 6, so as to realize all-round, multi-angle, dynamic and static combined spraying of the oil-cooled motor insulation system simulation structure 6.

[0062] In a specific embodiment, Fig.14 As shown, each of the submerged self-rotating spray terminals 422 includes an oil delivery pipeline 4221, an oil-swinging chamber 4222 and a plurality of atomizing nozzles 4223; the upper end of the oil delivery pipeline 4221 is connected to the innermost annular space, and the lower end is connected to the oil-swinging chamber 4222; along the axial direction of the oil-swinging chamber 4222, the plurality of atomizing nozzles 4223 are evenly arranged on the outer wall of the oil-swinging chamber 4222. In this embodiment, the oil delivery pipeline 4221 is a vertical oil delivery pipeline, and the upper end of the oil delivery pipeline 4221 is connected to the inner wall of the ring-wrapped sprayer 421, so that the circulating oil of the ring-wrapped sprayer 421 can enter the oil delivery pipeline 4221, and then the circulating oil enters the oil-spinning chamber 4222, and finally the cooling oil is sprayed out through all the atomizing nozzles 4223. Four atomizing nozzles 4223 are evenly arranged along the radial direction of the oil-spinning chamber 4222 and the outer wall of the oil-spinning chamber 4222. The design of the atomizing nozzle 4223 can increase the spraying area of ​​the cooling oil. At the same time, when the four atomizing nozzles 4223 spray the cooling oil, according to the law of conservation of angular momentum, the oil-spinning chamber will be driven to rotate automatically, without the need to add an additional drive motor, which not only reduces energy consumption but also reduces the complexity and reliability of the device, thereby further reducing the spraying dead angle inside the oil-cooled motor insulation system simulation structure 6, i.e., the model coil. The submersible self-rotating spray terminal 422 and the ring-wrapped spray terminal 421 are connected by threads, which is convenient for disassembly and assembly of the experimental device.

[0063] The present invention uses the ring-wrapped sprayer 421 and all the submerged self-rotating spray terminals 422 to sink to the inner side of the coil of the oil-cooled motor insulation system simulation structure 6, thereby spraying cooling oil on the oil-cooled motor insulation system simulation structure 6. The combination of two groups of spray terminals realizes all-round, multi-angle, three-dimensional and dynamic and static combined spray cooling of the experimental object, ensures the accurate and sufficient contact between the cooling oil and the insulation system simulation structure, and is conducive to improving the accuracy of the durability evaluation of the oil-cooled motor insulation system by the cooling oil.

[0064] In a specific embodiment, Fig.15 As shown, along the circumferential direction of the oil-slinging chamber 4222, a plurality of first guide baffles 7 and a plurality of second guide baffles 8 are provided in the oil-slinging chamber 4222, and at least two second guide baffles 8 are provided between adjacent first guide baffles 7. The first guide baffle 7 is an arc-shaped guide baffle, and the second guide baffle 8 is a vertical guide baffle. In this embodiment, the number of the first guide baffles 7 is 4, which are arranged as arc-shaped guide baffles. The four first guide baffles 7 divide the oil-slinging chamber 4222 into four sub-chambers. The arc-shaped design reduces the further flow resistance effect and facilitates the flow of cooling oil; the second guide baffle is arranged near the center of the oil-slinging chamber 4222, and two second guide baffles 8 are provided between adjacent first guide baffles 7, which are used to accelerate the flow rate of cooling oil and increase the nozzle injection pressure.

[0065] In a specific embodiment, Figure 2 As shown, the storage and temperature control module 2 includes an oil storage tank 21 and a ceramic heating shell 22. The oil storage tank 21 is located in the ceramic heating shell 22. The upper end of the oil storage tank 21 is connected to the heat exchange module 5, and the lower end is connected to the oil cooling circulation module 3. The ceramic heating shell 22 is coated on the oil storage tank 21. The oil storage tank 21 is connected to the heat exchange module 5 through a return pipe. The oil storage tank 21 is connected to the oil cooling circulation module 3 through an oil inlet pipe. The oil storage tank 21 is used to store cooling oil and collect cooling oil from the cooling oil heat exchange module 5. The ceramic heating shell 22 is used to heat the cooling oil in the oil storage tank 21 to a preset temperature and maintain the temperature constant. Among them, there is an oil level gauge inside the oil storage tank 21, which is used to display the oil level of the oil storage tank 21 in real time, and an oil drain port is left at the bottom of the oil storage tank. When the oil storage tank 21 delivers circulating oil to the dual-temperature aging chamber 41, there is a negative feedback temperature judgment control strategy, that is, the oil will not be pumped upward until the temperature reaches the preset temperature, but at the same time, the oil originally circulating will not be interrupted.

[0066] In a specific embodiment, the oil cooling circulation module 3 is an oil delivery pump. The oil delivery pump is a high-temperature oil pump controlled by a frequency converter. The frequency converter is connected to control the oil feed pump motor, so the circulating oil flow and flow rate can be adjusted as needed.

[0067] In a specific embodiment, Figure 1 As shown, the oil cooling circulation system processing and control platform 1 includes a controller, a temperature control module and a visual display module. The visual display module is used to set the temperature of the ceramic heating shell 22 in the storage and temperature control module 2, the temperature and pressure in the dual-temperature aging chamber 41 in the dual-temperature aging experimental platform 4, the fan speed of the air-cooled radiator of the cooling oil heat exchange module 5, and the delivery flow of the oil cooling circulation module 3. The ceramic heating shell 22 and the oil-cooled motor insulation system simulation structure 6 in the dual-temperature aging chamber 41 are heated to a preset temperature through the temperature control module. The controller and the temperature control module collect various operating data and set the preset temperature. The algorithm and analysis model are compared and analyzed to control the temperature of the ceramic heating shell 22, the temperature and pressure in the dual-temperature aging chamber 41, the temperature of the winding of the oil-cooled motor insulation system simulation structure 6, the fan speed of the cooling oil heat exchange module 5 air-cooled radiator, and the delivery flow of the oil-cooled circulation module 3. The temperature control module uses a PID operation unit to control the thyristor to control the toroidal transformer to output low voltage and high current for heating control. The controller is a PLC controller. The controller and the visual display module collect and display the temperature in real time through the 485 communication interface, as well as the main component control, flow, pressure, etc. The flow rate of the oil is controlled by the oil inlet pump controlled by the inverter to control the speed of the oil inlet cooling circulation module 3 by adjusting the frequency.

[0068] In a specific embodiment, the visual display module is also provided with a high temperature protection system and an emergency stop button and function, which can quickly stop the power supply and test of the device in case of an accident to protect the safety of the operator. The visual display module is provided with a timer function, which can set the thermal aging time. Once the time reaches the set time, the system will automatically stop heating the oil-cooled motor insulation system simulation structure 6. At the same time, the present invention also has a real-time verification function. When the oil-cooled motor insulation system simulation structure 6 begins to be heated, the winding temperature and the cooling oil temperature of the oil-cooled motor insulation system simulation structure 6 will gradually rise. Once the temperature of the oil-cooled motor insulation system simulation structure 6 and the cooling oil temperature reach the set temperature at the same time, the timer immediately starts to count down until the dual-temperature thermal aging test of the sub-cycle is completed. All detection and control parameters can be displayed on the screen of the visual display module in real time, which is clear at a glance.

[0069] The present invention has a wide range of inclusiveness for the selection of the oil-cooled motor insulation system 6, and is applicable to both the traditional round wire motor insulation system model and the flat wire motor insulation system model.

[0070] In the present invention, the outer wall of the dual-temperature aging chamber 41 and each conveying pipeline are wrapped with insulation cotton, so as to isolate the internal heat from dissipating to the outside as much as possible, and fully ensure that the temperature of the whole system is maintained within the preset temperature range.

[0071] The above-mentioned device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle and the method for evaluating the durability of the insulation system of an oil-cooled motor, such as Fig.16 As shown, the following steps are included: S1. Select the experimental object, i.e. the simulated structure 6 of the insulation system of the motor, and determine the reference standard for the aging test, such as GB / T17948.1 "Functional evaluation of the insulation structure of rotating electrical machines - Test procedure for random-wound windings - Thermal evaluation and classification", GB / T 17948.3 "Functional evaluation of the insulation structure of rotating electrical machines - Test procedure for formed windings - Thermal evaluation and classification of the insulation structure of rotating electrical machines", GB / T20111.1 "Electrical insulation system thermal evaluation procedure - Part 1: General requirements - Low voltage" or relevant IEC, IEEE and other relevant standards. According to the selected standard and the expected heat resistance level of the test piece, select the corresponding three temperature points of accelerated thermal aging (respectively called high temperature point, medium temperature point and low temperature point) and aging sub-cycle time in the standard. For example, the expected heat resistance level of the simulated structure 6 of the insulation system of the oil-cooled motor is 180℃. According to GB / T 20111.1, the three accelerated aging temperatures and the corresponding aging sub-cycle time are 195℃ (72 h), 215℃ (336 h) and 235℃ (840 h) respectively.

[0072] S2. Select the oil temperature according to GB / T 22578.1 "Thermal evaluation of liquid and solid components in electrical insulation systems Part 1: General requirements" or the actual oil-cooled motor requirements.

[0073] S3. Perform relevant pretreatment on the oil-cooled motor insulation system simulation structure 6 and the oil.

[0074] S4, installing the oil-cooled motor insulation system simulation structure 6 into the dual-temperature aging chamber 41 in the dual-temperature aging experimental platform 4, arranging the thermocouples of the corresponding temperature sensors 412 at appropriate positions on the windings, and then closing the dual-temperature aging chamber 41.

[0075] S5. The pre-treated oil is loaded into the oil storage tank 21 and the oil storage tank 21 is sealed.

[0076] S6. Set the temperature of the oil, the aging temperature of the oil-cooled motor insulation system simulation structure 6 (for example, first perform double-temperature aging at a high temperature point, i.e., 235°C), and the periodic aging time in the visualization display module.

[0077] S7, then start the oil cooling circulation system processing and control platform 1, and use the temperature control module to raise the oil in the ceramic heating shell 22 to a preset temperature, and start the temperature control module corresponding to the oil cooling motor insulation system simulation structure 6 in the dual-temperature aging chamber 41 to raise it to a preset temperature.

[0078] S8. When the controller and the temperature control module detect that the oil temperature and the temperature of the oil-cooled motor insulation system simulation structure 6 have reached the preset temperature, the delivery flow of the oil-cooled circulation module 3 is controlled, and the system will automatically start the oil inlet pump, and the oil is pumped into the oil injection assembly pipeline of the dual-temperature aging chamber 41 to spray the oil-cooled motor insulation system simulation structure 6. Then, after a period of internal temperature adjustment and control of the system, when the temperature of the oil-cooled motor insulation system simulation structure 6 and the oil both reach the preset temperature again at the same time, the system will automatically start the countdown function, and the entire system will circulate according to the aforementioned oil operation loop until the set aging sub-cycle duration is completed.

[0079] S9. Once the running time reaches the end of the set time, the system will automatically stop pumping oil and heating (including heating of the oil and heating of the oil-cooled motor insulation system simulation structure 6), and a prompt sound will sound, and the words "This cycle test has been completed" will be displayed on the LCD panel to remind the test personnel that this cycle of dual-temperature aging test is completed.

[0080] S10, after the oil-cooled motor insulation system simulation structure 6 is cooled to about room temperature, close the two stop valves on the oil inlet pipeline and the oil return pipeline, open the dual-temperature aging chamber 41, take out the oil-cooled motor insulation system simulation structure 6, and perform subsequent mechanical vibration, thermal shock, moisture exposure and dielectric diagnosis tests, such as Fig.16 As shown. The mechanical vibration operation is carried out in accordance with clause 4.1.5 "Passenger cars, drive motors" in ISO 16750-3:2023. The oil-cooled motor insulation system simulation structure 6 is fixed on a commercial electric vibration table or other excitation system device and vibrated for 2 hours in each direction of each aging cycle in the three directions of X, Y, and Z (the X direction is the vehicle driving direction, the Y direction is perpendicular to the vehicle driving direction and the vertical direction, and the Z direction is perpendicular to the ground). Then a dedicated hot and cold shock test chamber or a high temperature test chamber and a low temperature test chamber are used in combination, and the oil-cooled motor insulation system simulation structure 6 is subjected to hot and cold shock operation by manual movement, generally from low temperature such as -40°C to high temperature. The high temperature is the expected heat resistance level of the oil-cooled motor insulation system simulation structure 6 plus 20°C or other temperature values ​​that meet the experimental requirements. The duration of the high temperature point and the low temperature point is determined by the heat capacity of the oil-cooled motor insulation system simulation structure 6, which can generally be selected as 1 h, 3 h, etc. Afterwards, the oil-cooled motor insulation system simulation structure 6 was moved into a constant temperature and humidity test chamber and subjected to moisture exposure treatment for 48 h according to the parameter settings of 25°C and 98%RH. Thereafter, the oil-cooled motor insulation system simulation structure 6 was subjected to withstand voltage test, insulation resistance test, dielectric loss factor test, capacitance test of the oil-cooled motor insulation system simulation structure 6, and partial discharge inception voltage test according to the corresponding test standards to obtain and record the corresponding dielectric diagnostic parameters of the oil-cooled motor insulation system simulation structure 6 in the aging sub-cycle.

[0081] S11, then continue to perform the dual-temperature thermal aging and other diagnostic tests of steps S6 to S10 until the oil-cooled motor insulation system simulation structure 6 reaches the preset end-of-life standard, then the dual-temperature thermal aging test at this temperature point is completed, and the dual-temperature aging test at the next temperature point, such as the medium temperature point, is performed until the dual-temperature thermal aging test at the low temperature point is finally completed.

[0082] S12. Using the data obtained from the dual-temperature aging test at all three temperature points, the data are fitted and processed according to the Arrhenius equation, and the heat resistance grade of the oil-cooled motor insulation system simulation structure 6 is graded and evaluated according to the existing heat resistance grade classification.

[0083] S13. If the air pressure inside the aging chamber 41 increases abnormally or the oil temperature of the oil-cooled motor insulation system simulation structure 6 is abnormal during the dual-temperature aging test, the device will immediately alarm and request the test personnel to judge the fault. When the air pressure or oil temperature reaches the preset safety limit, regardless of whether there is human intervention, the system will automatically cut off the heating power supply and the heater operation, and the oil pump will also stop working to prevent catastrophic consequences.

[0084] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0085] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle, characterized in that: include: The storage and temperature control module (2) is used to store the cooling oil and heat the cooling oil to a preset temperature to form circulating oil, and to transport the circulating oil to the dual-temperature aging experimental platform (4) through the oil cooling circulation module (3); A dual-temperature aging test platform (4) is used to simulate the oil-cooling circulation environment when the motor is running, and to perform accelerated aging tests and durability tests on the oil-cooling motor insulation system simulation structure (6). The dual-temperature aging test platform (4) is provided with a spray assembly (42) and two oil-cooling motor insulation system simulation structures (6). The spray assembly (42) includes a ring-wrapped sprayer (421) and two submersible self-rotating spray terminals (422). The spray assembly (42) is connected to the oil-cooling circulation module (3); the two submersible self-rotating spray terminals (422) are relatively arranged on the ring-wrapped sprayer. Inside the shower (421), an oil-cooled motor insulation system simulation structure (6) is respectively provided on opposite sides of two submersible self-rotating spray terminals (422); the ring-wrapped sprayer (421) uses the circulating oil delivered by the oil-cooling circulation module (3) to spray the outsides of the two oil-cooled motor insulation system simulation structures (6); each submersible self-rotating spray terminal (422) uses the circulating oil delivered by the oil-cooling circulation module (3) to spray the inside of one oil-cooled motor insulation system simulation structure (6), so as to achieve an oil-cooling circulation environment when simulating the motor operation; The heat exchange module (5) is used to cool the circulating oil output from the dual-temperature aging experimental platform (4) to form cooling oil, and to transport the cooling oil to the storage and temperature control module (2).

2. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 1, characterized in that: The ring-wrapped sprayer (421) comprises a U-shaped tube (423) and two ring-wrapped spray terminals (424); the inlet of the U-shaped tube (423) is connected to the oil-cooling circulation module (3); a sample rack (61) is provided on the inner wall of the U-shaped tube (423) away from the oil-cooling circulation module (3); two oil-cooling motor insulation system simulation structures (6) are symmetrically arranged at the upper and lower ends of the sample rack (61); the two ring-wrapped spray terminals (424) are symmetrically arranged on the two horizontal ends of the U-shaped tube (423) along the axial direction of the sample rack (61); the two oil-cooling motor insulation system simulation structures (6) are respectively located in the space formed by each ring-wrapped spray terminal (424); the inner wall of each ring-wrapped spray terminal (424) is connected to a submerged self-rotating spray terminal (422); the two submerged self-rotating spray terminals (422) are symmetrically distributed and are respectively located above and below the sample rack (61).

3. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 2, characterized in that: Each ring-wrapped spray terminal (424) comprises a horizontal spray terminal (425), two inclined spray terminals (426) and two vertical spray terminals (427); the middle of the inner wall of the horizontal spray terminal (425) is connected to a ring-wrapped sprayer (421); the highest inclined ends of the two inclined spray terminals (426) are correspondingly connected to the two ends of the horizontal spray terminal (425); the lowest inclined end of each inclined spray terminal (426) is correspondingly connected to a vertical spray terminal (427); the two inclined spray terminals (426) and the two vertical spray terminals (427) are distributed in a symmetrical structure with the ring-wrapped sprayer (421) as the axis.

4. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 3, characterized in that: The horizontal spray terminal (425) comprises a connecting channel (4251) and a spray plate (4252); one end of the connecting channel (4251) is correspondingly connected to a horizontal end of the U-shaped tube (423); the other end of the connecting channel (4251) is connected to the spray plate (4252); the spray direction of the spray plate (4252) is toward the oil-cooled motor insulation system simulation structure (6), and is used to spray the outer side of the coil of the oil-cooled motor insulation system simulation structure (6).

5. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 4, characterized in that: The spray plate (4252) has a plurality of annular baffles (4253) arranged from the inside to the outside, all of the annular baffles (4253) are concentric and arranged with equal gradients in the radial direction, one end of all the annular baffles (4253) close to the inner wall of the spray plate (4252) is connected to the inner wall of the spray plate (4252) via a connecting rod, an annular space is formed between adjacent annular baffles (4253), an outlet pipe (42531) is provided in the innermost annular space, and the outlet pipe (42531) is connected to the submerged self-rotating spray terminal (422); an annular circulation groove (4254) is provided between the lower end of all the annular baffles (4253) and the bottom wall of the spray plate (4252), the annular circulation groove (4254) is connected to the connecting channel (4251), and the annular circulation groove (4254) is used to circulate circulating oil to all the annular spaces; A sealing cover (4256) is slidably provided on the spray plate (4252), and a plurality of spray holes (4255) are evenly distributed on a portion of the sealing cover (4256) located in the annular space.

6. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 5, characterized in that: The lower end side walls of the cover (4256) are each provided with a U-shaped groove (4257) and a second L-shaped plate (4258), the second L-shaped plate (4258) comprising a second vertical plate and a second horizontal plate, the upper end of the second vertical plate is connected to the lower end wall of the cover (4256), the lower end is connected to one end of the second horizontal plate, and the other end of the second horizontal plate is connected to one end of the U-shaped groove (4257); the symmetrical side walls of the spray plate (4252) are each provided with a first L-shaped plate (4259), the first L-shaped plate (4259) comprising a first vertical plate and a first horizontal plate, one end of the first horizontal plate is connected to the inner wall of the spray plate (4252), and the other end is connected to the upper end of the first vertical plate, and the lower end of the first vertical plate is slidably arranged in the U-shaped groove (4257).

7. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 6, characterized in that: The two inner walls of the U-shaped groove (4257) are each provided with a first arc-shaped groove (42581), the outer wall of the first vertical plate is each provided with a second arc-shaped groove (42582) corresponding to the first arc-shaped groove (42581), the first arc-shaped groove (42581) and the second arc-shaped groove (42582) are axially symmetrical and form a fixing hole, the fixing hole is provided with a threaded groove, and each fixing hole is screwed with a T-shaped screw rod (42583).

8. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 7, characterized in that: The inclined spray terminal (426) and the vertical spray terminal (427) both comprise a connecting channel (4251) and a spray plate (4252); the spray plate (4252) comprises a plurality of annular baffles (4253) arranged from the inside to the outside; all the annular baffles (4253) are concentric and arranged with equal gradients in the radial direction; an annular space is formed between adjacent annular baffles (4253); a square spray port (428) is provided in the innermost annular space; and a plurality of spray holes (4255) are evenly distributed on a partial cover (4256) located at the square spray port (428).

9. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 5, characterized in that: Each of the submersible self-rotating spray terminals (422) comprises an oil delivery pipeline (4221), an oil-swinging chamber (4222) and a plurality of atomizing nozzles (4223); the upper end of the oil delivery pipeline (4221) is connected to an outlet pipe (42531), and the lower end is connected to the oil-swinging chamber (4222); along the radial direction of the oil-swinging chamber (4222), the plurality of atomizing nozzles (4223) are evenly arranged on the outer wall of the oil-swinging chamber (4222).

10. The device for evaluating the effect of cooling oil on the durability of the insulation system of an oil-cooled motor for a vehicle according to claim 9, characterized in that: Along the circumferential direction of the oil-swing chamber (4222), a plurality of first flow-guiding baffles (7) and a plurality of second flow-guiding baffles (8) are provided in the oil-swing chamber (4222), and at least two second flow-guiding baffles (8) are provided between adjacent first flow-guiding baffles (7).

Images