Durability test bench of electronic oil pump for new energy automobile

Abstract

The invention relates to the technical field of electronic oil pump test equipment, in particular to a durability test bench of an electronic oil pump for a new energy automobile, which comprises a heat exchange type tank body, an environmental box, a test sample pump, a high-position expansion tank, a mold temperature controller and a control cabinet. The tank body is arranged in the environment box, and the sample pump is arranged at a bottom outlet of the tank body to form a medium circulation loop; the high-position expansion tank is connected with the top of the tank body, absorbs air and accommodates medium volume change; the mold temperature controller is connected with the in-tank heat exchange tube and provides independent temperature control for a medium; an environment box controls temperature, a control cabinet plans power supply and operation as a whole, a short loop in the tank and pump co-placement box is communicated, and it is ensured that the medium temperature fits the working condition during starting and stopping; the circular tank body is provided with an isolation heat exchange structure, so that temperature control, test media and pipe wall heat exchange are not mixed, retention and deposition are reduced through a lower suction and upper backflow flowing mode, and the impurity blocking risk is reduced; the overall structure is compact, heat loss and land occupation of external liquid storage and long pipelines are reduced, an adjusting and detecting part outside the box is convenient to maintain, and long-term stable operation of the rack is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of electronic oil pump testing equipment technology, specifically to a durability testing bench for electronic oil pumps used in new energy vehicles. Background Technology

[0002] The durability test bench for electronic oil pumps used in new energy vehicles is a specialized testing device for verifying the long-term reliability of electronic oil pumps. This type of bench typically constructs a test medium circulation loop and continuously operates the electronic oil pump under controlled environmental conditions to closely simulate the temperature changes, load fluctuations, and medium conditions encountered in actual vehicle use. This allows for observation of whether the oil pump can maintain stable output and whether phenomena such as leakage, wear, and efficiency degradation occur during long-term operation. Because the power and thermal management systems of new energy vehicles have high requirements for reliability and safety boundaries, the electronic oil pump plays a crucial role in the continuous supply and regulation of these systems. Its operating status directly affects the operating temperature and lubrication / cooling effect of key components. Therefore, durability testing is necessary to verify its long-term adaptability, failure modes, and reliability level, providing a basis for product design and quality control.

[0003] In existing technologies, durability testing of electronic oil pumps typically employs a combination of environmental control equipment and a circulation loop. During testing, the electronic oil pump under test is installed in a chamber or enclosure that provides the necessary temperature conditions, placing the pump in the required environmental atmosphere. A media storage unit and circulation pipeline are installed outside the chamber. The oil pump draws the test medium from the storage unit, enters the pump through the pipeline, exits from the outlet, and then returns to the storage unit via a return pipeline, forming a closed loop. To ensure the medium reaches the target temperature, temperature control equipment is often used to heat or cool the storage unit or heat exchange loop, along with pressure, flow rate, and temperature sensors to acquire operating parameters. The testing process generally includes sample installation, loop filling and venting, environmental and media temperature setting, flow rate setting, continuous operation and parameter acquisition, anomaly monitoring, and data processing and evaluation after the test.

[0004] However, under the above organizational method, when the test needs to simulate temperature alternation and includes a shutdown phase, the medium in some sections of the loop may be in a stagnant state, and the medium temperature and the chamber temperature are prone to asynchrony. This causes the medium drawn in during the initial stage of the oil pump restart to be at a different temperature than the target temperature, thus affecting the realistic reproduction of cold start conditions. For scenarios where particulate impurities need to be added to the test medium to simulate a polluted environment, the internal structure of the storage unit and the external circulation heat exchange path are often quite complex. Impurities are prone to deposit in local areas or dead corners of the pipeline, making it difficult to maintain a stable and consistent impurity concentration entering the oil pump. At the same time, impurities entering the heat exchange unit of the temperature control equipment may also bring the risk of blockage or damage. In addition, when using a larger storage unit and a longer external pipeline, the system's temperature rise and fall inertia increases, heat loss increases, and the space occupied and energy consumption also increase, which is not conducive to the compactness of the test bench and the economic efficiency of operation, and may affect the rapid establishment and stable maintenance of test conditions. To address these issues, this invention proposes a durability test bench for electronic oil pumps used in new energy vehicles. Summary of the Invention

[0005] The purpose of this invention is to provide a durability test bench for electronic oil pumps used in new energy vehicles, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a durability test bench for an electronic oil pump used in new energy vehicles, comprising: a specially designed heat exchange tank, an environmental chamber, a test sample pump, a high-level expansion tank, a mold temperature controller, and a control cabinet. The specially designed heat exchange tank is disposed inside the environmental chamber. The test sample pump is installed at the bottom outlet of the heat exchange tank and is directly connected to the heat exchange tank through a short pipeline, thereby forming a loop in which the test medium circulates from the heat exchange tank back to the heat exchange tank via the test sample pump. The high-level expansion tank is connected to the top of the heat exchange tank through a guide pipe and an exhaust pipe, and is used to absorb air from the medium in the circulation loop and accommodate the volume expansion or contraction of the medium due to temperature changes. The mold temperature controller is connected to the heat exchange tube inside the heat exchange tank through a first connecting pipe and a second connecting pipe to provide an independent heating or cooling source to the test medium inside the heat exchange tank. The environmental chamber is used to provide a controllable ambient temperature for the test sample pump and the heat exchange tank. The control cabinet is used to supply power and control the operation of the environmental chamber, the mold temperature controller, and the test sample pump.

[0007] Preferably, the test bench has a multi-station structure, which can simultaneously install and test multiple of the aforementioned test sample pumps.

[0008] Preferably, the bottom of the heat exchange tank is provided with a funnel-shaped outlet, the inlet of the test sample pump is connected to the funnel-shaped outlet through an elbow, and a manual ball valve is provided between the funnel-shaped outlet and the inlet of the test sample pump so as to disassemble the test sample pump when the heat exchange tank is filled with medium.

[0009] Preferably, the inlet and outlet pipes of the test sample pump are equipped with tee connectors, and each tee connector is connected to a pressure sensor located outside the environmental chamber via a pressure guide pipe, for measuring the inlet pressure and outlet pressure of the test sample pump respectively.

[0010] Preferably, a flow regulating valve and a flow meter are sequentially installed on the outlet pipeline of the test sample pump, and both the flow regulating valve and the flow meter are installed outside the environmental chamber to adjust and measure the output flow of the test sample pump.

[0011] Preferably, the top of the high-level expansion tank is provided with a liquid inlet, a pressure inlet and a pressure relief inlet, and a safety valve is installed on the high-level expansion tank for adding test medium to the circulation loop, pressurizing the circulation loop under specific conditions, and releasing pressure in case of overpressure to achieve safety protection.

[0012] Preferably, the environmental chamber is equipped with an environmental chamber explosion vent and a combustible gas sensor, which are used to release pressure and detect combustible gas when the test medium leaks and generates combustible gas, thereby improving the safety of the test process.

[0013] Preferably, the heat exchange tank has a circular structure and is equipped with several heat exchange tubes inside. The heat exchange tubes are used to contain the heat transfer oil medium of the mold temperature controller and exchange heat with the test medium circulating inside the heat exchange tank through the tube walls, thereby isolating the heat transfer oil medium from the test medium. The test medium circulation path of the heat exchange tank adopts a flow mode of bottom suction, top return and downward impact, so that the test medium mixed with impurities circulates along the inner wall of the heat exchange tank and the outer wall of the heat exchange tubes and is not easy to deposit.

[0014] Preferably, the control cabinet is equipped with a precision power supply corresponding to the number of test sample pumps, which is used to provide an independent power supply for each of the test sample pumps; the control cabinet is also equipped with an industrial computer, a data acquisition card, a communication interface module and a switch, which are used to run the bench test software and form the control system of the test bench.

[0015] Preferably, the control system controls the environmental chamber, the mold temperature controller, and the test sample pump respectively through a communication protocol, and collects signals from the pressure sensor, flow meter, and temperature sensor to realize real-time monitoring and recording of flow, pressure, and temperature parameters, so as to evaluate the performance and reliability of the test sample pump based on the parameters.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention arranges the test medium storage and heat exchange unit inside the environmental chamber, and directly connects the electronic oil pump to the unit through an extremely short loop, so that the pump body, medium and connection section can reach the target state synchronously under the same environmental conditions; when conducting temperature alternation tests including shutdown phases, the medium in the loop can maintain consistency without relying on the heat transfer of long-distance external pipelines, so that the medium sucked in when the oil pump restarts is closer to the set operating conditions, ensuring the coverage and repeatability of the durability test for key stages.

[0017] 2. This invention employs a circular heat exchange tank with an internal isolation heat exchange structure, allowing the temperature control medium to circulate within the heat exchange tubes while the test medium flows outside the tubes. The two exchange heat only through the tube walls and do not mix. Simultaneously, the test medium forms a circulating flow pattern of lower intake, upper return, and downward impact. Combined with the circular structure to reduce stagnation areas, this makes it easier for added particulate impurities to maintain a uniform distribution with the fluid and continuously participate in the circulation. This is beneficial for achieving durability testing with impurity-containing media and reduces the risk of impurities entering the temperature control equipment circuit and causing blockage or damage.

[0018] 3. This invention constructs the medium circuit in a compact integrated manner, reducing the configuration of external liquid storage units and external long pipelines, making the heat exchange during the system's heating and cooling process more concentrated and the heat loss lower, thereby helping to reduce energy consumption and space occupation; at the same time, key adjustment and detection components can be arranged outside the environmental chamber for easy operation and maintenance. The whole machine improves the ease of construction and operational stability while ensuring controllable test conditions, making it more suitable for the organizational needs of long-term continuous durability testing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a bottom view of the overall structure of the present invention; Figure 4 This is a top view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the heat exchange tank structure of the present invention; Figure 6This is a schematic diagram of the internal structure of the heat exchange tank of the present invention.

[0020] In the diagram: 1. Heat exchange tank; 2. Pressure sensor; 3. Flow meter; 4. Flow regulating valve; 5. Pressure guide pipe; 6. Environmental chamber; 7. Control cabinet; 8. Test sample pump; 9. High-level expansion tank; 10. Exhaust pipe; 11. Liquid inlet; 12. Pressurization port; 13. Pressure relief port; 14. Safety valve; 15. Mold temperature controller; 16. Combustible gas sensor; 17. Environmental chamber explosion vent; 18. Manual ball valve; 19. Flow guide pipe; 20. First connection pipe of mold temperature controller; 21. Second connection pipe of mold temperature controller; 22. Temperature sensor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 6 This invention provides a technical solution: a durability test bench for an electronic oil pump used in new energy vehicles, comprising: a specially designed heat exchange tank 1 housed inside an environmental chamber 6; a test sample pump 8 installed at the bottom outlet of the heat exchange tank 1 and directly connected to it via a short pipe to form a closed loop in which the test medium circulates back to the tank via the pump; a high-level expansion tank 9 connected to the top of the heat exchange tank 1 via a guide pipe 19 and an exhaust pipe 10; a mold temperature controller 15 connected to the heat exchange tubes inside the heat exchange tank 1 via a first mold temperature controller connection pipe 20 and a second mold temperature controller connection pipe 21; an environmental chamber 6 providing a controllable ambient temperature for the test sample pump 8 and the heat exchange tank 1; and a control cabinet 7 for power supply, control, and data acquisition of the entire system. The test bench can be designed as a multi-station structure. For example, in a six-station embodiment, six independent circulation loops and corresponding test sample pumps 8 can be arranged in the same environmental chamber 6, and the control cabinet 7 provides corresponding independent power supplies and control units to achieve parallel testing of multiple samples.

[0023] In this embodiment, the bottom of the heat exchange tank 1 is designed with a funnel-shaped outlet. The suction inlet of the test sample pump 8 is connected to this outlet via an elbow, and a manual ball valve 18 is installed on the connecting pipeline. When the tank is full of test medium, closing the ball valve can block the flow, thereby facilitating the disassembly and replacement of the test sample pump 8 without discharging the medium.

[0024] To achieve accurate monitoring of the pump's operating status, a T-junction is installed on both the inlet and outlet pipes of the test sample pump 8. Each T-junction is connected to a pressure sensor 2 located outside the environmental chamber 6 via a pressure-conducting pipe 5. This design transfers the pressure signal requiring precise measurement from the extreme internal temperature environment to the external normal temperature environment for detection, protecting the reliability and lifespan of the pressure sensor 2 while ensuring the accuracy of pressure parameters, especially the inlet pressure difference, i.e., the pump's head measurement.

[0025] On the outlet pipe of the test sample pump 8, a flow regulating valve 4 and a flow meter 3 are sequentially installed outside the environmental chamber 6. The flow regulating valve 4 is used to set and adjust the resistance of the test loop to simulate different flow conditions; the flow meter 3 is used to monitor the medium flow rate in real time. Placing these two components outside the chamber facilitates operation and reading, and also avoids the impact of extreme temperatures on their accuracy and lifespan. After the medium flows through the flow meter 3, it returns to the interior of the environmental chamber 6 through the pipeline and re-enters from the top of the heat exchange tank 1, thus completing the "bottom suction, top return" circulation path.

[0026] The high-level expansion tank 9 is connected to the top of the heat exchange tank 1 via a guide pipe 19 and an exhaust pipe 10. Its core function is to absorb gas in the circulation loop and accommodate the volume expansion and contraction of the medium due to temperature changes, thereby ensuring that the loop is always full of medium and the pressure is stable. The top of the high-level expansion tank 9 is equipped with a liquid inlet 11, a pressure inlet 12, and a pressure relief port 13, which are used to add test medium to the system, pressurize the loop under specific test conditions, and actively release pressure, respectively. In addition, a safety valve 14 is installed on the high-level expansion tank 9 as a final protection; it will automatically open to release pressure when the system pressure unexpectedly exceeds the safety threshold.

[0027] The environmental chamber 6 provides programmable temperature conditions for the test sample pump 8 and its internal circulation loop, simulating extreme environments from high to low temperatures and rapid temperature cycling. Because the test sample pump 8 and the heat exchange tank 1 are both tightly arranged inside the environmental chamber 6 with extremely short connecting pipes, this compact layout greatly reduces heat loss, improves temperature control efficiency and response speed, and also saves floor space. Considering the potential flammability of the test medium, the environmental chamber 6 is equipped with a combustible gas sensor 16 and an environmental chamber explosion vent 17 to monitor for leaks, provide early warning, and directional pressure relief in extreme situations, thereby enhancing the safety of the testing process.

[0028] The heat exchange tank 1 adopts a cylindrical design and integrates several longitudinally arranged heat exchange tubes inside. The circulating medium, such as heat transfer oil, of the mold temperature controller 15 flows inside the heat exchange tubes, forming an independent temperature control loop; while the test medium flows in the annular space between the outer wall of the heat exchange tubes and the inner wall of the tank. The two media exchange heat efficiently through the metal tube walls but are physically completely isolated. This design allows the mold temperature controller 15 to adjust the heat transfer oil temperature within a wide range of -70℃ to 150℃, thereby precisely controlling the test medium to reach the required test temperature, such as -40℃ to 120℃. Crucially, the test medium flows through the tank using a "bottom-in, top-out" flow pattern with downward impact. Combined with the cylindrical structure without dead corners, this flow pattern effectively prevents impurities such as sand particles added during the test from depositing in the system, ensuring uniform impurity concentration and complete participation in circulation, realistically simulating harsh working conditions, while completely avoiding the risk of impurities entering and damaging the precision heat exchanger inside the mold temperature controller 15.

[0029] The control cabinet 7 is the intelligent control and data processing center of this test bench. It contains independent precision power supplies, industrial computers, data acquisition cards, communication modules such as CAN / LIN / PWM, and network switches, corresponding to the number of test sample pumps 8. By running dedicated host computer software, the control system can automatically coordinate and control the temperature curve of the environmental chamber 6, the power output of the mold temperature controller 15, and the start-up, shutdown, and operating conditions of each test sample pump 8 according to a preset durability test program. Simultaneously, the system collects data from all pressure sensors 2, flow meters 3, temperature sensors 22, etc., in real time, continuously recording and analyzing the data online. Once any abnormal parameter is detected, such as sudden pressure changes, insufficient flow, or a combustible gas alarm, the system can immediately issue an alarm and execute emergency shutdown and other protective commands to ensure test safety.

[0030] In actual use, the operator first presets the durability test program, such as high and low temperature cycle curves and load spectrum, through the host computer software of the control cabinet 7, and then injects the test medium, which may contain a specified proportion of impurities such as sand, into the system through the liquid filling port 11 of the high-level expansion tank 9.

[0031] After startup and operation, the entire system works in tandem: Dual-cycle drive: The test sample pump 8 starts, driving the test medium to circulate in a closed loop integrated within the highly compact environmental chamber 6, drawing it in from the bottom of the tank and returning it from the top. At the same time, the mold temperature controller 15 drives the heat transfer oil to circulate in independent heat exchange tubes inside the tank.

[0032] Precise temperature control and realistic operating condition simulation: The environmental chamber 6 provides the ambient temperature for the pump body, while the mold temperature controller 15 precisely controls the medium temperature through isolated heat exchange. This design ensures that the medium in the pump, tank, and all short pipelines can reach the target low temperature simultaneously when simulating extreme alternating operating conditions such as "cold start". This ensures that the pump draws in the required low-temperature medium at the moment of startup, solving the problem of inconsistent temperature in traditional long pipeline solutions.

[0033] Uniform suspension and protection of impurities: The medium forms a "bottom suction and top return" scouring flow field in the cylindrical heat exchange tank 1. Combined with the dead-angle-free structure, it can effectively keep impurities suspended and uniformly participate in circulation, realistically simulating harsh fluid conditions, while completely avoiding the risk of impurities entering and damaging the heat exchanger of the mold temperature controller 15.

[0034] Automated monitoring and safety assurance: Throughout the testing process, key parameters such as pressure, flow rate, temperature, and combustible gas concentration are collected, recorded, and analyzed in real time. The control system can automatically execute the test program and alarm or shut down in case of abnormalities. Multiple safety designs (safety valve 14, explosion relief port) ensure the safety and reliability of the test.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A durability test bench for an electronic oil pump used in new energy vehicles, comprising a specially designed heat exchange tank (1), an environmental chamber (6), a test sample pump (8), a high-level expansion tank (9), a mold temperature controller (15), and a control cabinet (7), characterized in that: The specially designed heat exchange tank (1) is installed inside the environmental chamber (6). The test sample pump (8) is installed at the bottom outlet of the heat exchange tank (1) and is directly connected to the heat exchange tank (1) through a short pipe, thereby forming a loop in which the test medium circulates back from the heat exchange tank (1) to the heat exchange tank (1) via the test sample pump (8). The high-level expansion tank (9) is connected to the top of the heat exchange tank (1) through the guide pipe (19) and the exhaust pipe (10) to absorb the air in the medium in the circulation loop and accommodate the volume expansion or contraction of the medium due to temperature changes. The mold temperature controller (15) is connected to the heat exchange tube inside the heat exchange tank (1) through the first connecting pipe (20) and the second connecting pipe (21) of the mold temperature controller, so as to provide an independent heating or cooling source to the test medium inside the heat exchange tank (1); The environmental chamber (6) is used to provide a controllable ambient temperature for the test sample pump (8) and the heat exchange tank (1); The control cabinet (7) is used to supply power and control the operation of the environmental chamber (6), the mold temperature controller (15) and the test sample pump (8).

2. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 1, characterized in that: The test bench is a multi-station structure, which can simultaneously install and test multiple of the test sample pumps (8).

3. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 2, characterized in that: The bottom of the heat exchange tank (1) is provided with a funnel-shaped outlet. The inlet of the test sample pump (8) is connected to the funnel-shaped outlet through an elbow. A manual ball valve (18) is provided between the funnel-shaped outlet and the inlet of the test sample pump (8) so that the test sample pump (8) can be disassembled when the heat exchange tank (1) is filled with medium.

4. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 3, characterized in that: The test sample pump (8) is equipped with a three-way connector on both the inlet and outlet pipes, and each three-way connector is connected to a pressure sensor (2) located outside the environmental chamber (6) via a pressure guide pipe (5) to measure the inlet pressure and outlet pressure of the test sample pump (8) respectively.

5. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 4, characterized in that: The outlet pipe of the test sample pump (8) is provided with a flow regulating valve (4) and a flow meter (3) in sequence, and the flow regulating valve (4) and the flow meter (3) are both installed outside the environmental chamber (6) so as to regulate and measure the output flow of the test sample pump (8).

6. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 5, characterized in that: The top of the high-level expansion tank (9) is provided with a liquid inlet (11), a pressure inlet (12) and a pressure relief inlet (13), and a safety valve (14) is installed on the high-level expansion tank (9) for adding test medium to the circulation loop, pressurizing the circulation loop under specific conditions, and releasing pressure in case of overpressure to achieve safety protection.

7. The durability test bench for an electronic oil pump for new energy vehicles according to claim 6, characterized in that: The environmental chamber (6) is equipped with an environmental chamber explosion vent (17) and a combustible gas sensor (16), which are used to release pressure and detect combustible gas when the test medium leaks and generates combustible gas, thereby improving the safety of the test process.

8. The durability test bench for an electronic oil pump for new energy vehicles according to claim 7, characterized in that: The heat exchange tank (1) has a circular structure and is equipped with several heat exchange tubes inside. The heat exchange tubes are used to contain the heat transfer oil medium of the mold temperature controller (15) and exchange heat with the test medium circulating inside the heat exchange tank (1) through the tube wall, thereby isolating the heat transfer oil medium from the test medium. The test medium circulation path of the heat exchange tank (1) adopts a flow mode of bottom suction, top return and downward impact, so that the test medium mixed with impurities circulates along the inner wall of the heat exchange tank (1) and the outer wall of the heat exchange tube and is not easy to deposit.

9. The durability test bench for an electronic oil pump used in new energy vehicles according to claim 8, characterized in that: The control cabinet (7) is equipped with a precision power supply corresponding to the number of test sample pumps (8), which is used to provide an independent power supply for each of the test sample pumps (8); the control cabinet (7) is also equipped with an industrial computer, a data acquisition card, a communication interface module and a switch, which are used to run the bench test software and form the control system of the test bench.

10. The durability test bench for an electronic oil pump for new energy vehicles according to claim 9, characterized in that: The control system controls the environmental chamber (6), the mold temperature controller (15) and the test sample pump (8) respectively through the communication protocol, and collects the signals of the pressure sensor (2), flow meter (3) and temperature sensor (22) to realize real-time monitoring and recording of flow, pressure and temperature parameters, so as to evaluate the performance and reliability of the test sample pump (8) based on the parameters.

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