Electromagnetic valve high and low temperature performance test equipment

Abstract

The utility model relates to solenoid valve performance test technical field especially relates to a solenoid valve high and low temperature performance test equipment. It includes main frame, energy storage module, oil circuit control module, circulating oil station module, temperature box module, buffer steel bottle module, measured fixture module, rack module and control cabinet module. The utility model has the beneficial effect that: this technical scheme through setting pressure regulating module and oil circuit control module, has realized the accurate control of pipeline pressure and flow, has avoided the test data deviation caused by pressure fluctuation or unstable flow.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve performance testing technology, and in particular to a high and low temperature performance testing device for electromagnetic valves. Background Technology

[0002] With the rapid development of the automotive industry, the development and testing of braking systems has become an indispensable and crucial part of the automobile manufacturing process. As a key component of the automotive braking system, the performance of hydraulic solenoid valves directly affects the safety and reliability of the entire vehicle. Therefore, accurate and comprehensive performance testing of hydraulic solenoid valves is of paramount importance.

[0003] In the prior art, patent document CN119290371A discloses a solenoid valve testing device. However, most of these solenoid valve performance testing devices are only suitable for testing under normal temperature conditions, and the testing methods largely rely on manual operation. This method is not only inefficient but also prone to inaccurate test data due to human error. Furthermore, traditional testing equipment has significant shortcomings in simulating actual high and low temperature conditions, failing to meet the testing requirements of modern braking systems for adaptability to complex environments.

[0004] On the other hand, the installation and sealing of the tested product are also crucial factors affecting test accuracy. Traditional testing equipment typically uses threaded connectors to connect pipelines, a method prone to seal failure after repeated use, leading to inaccurate test results. Furthermore, existing equipment has limitations in oil circulation and venting functions, often requiring additional steps to complete the venting process, increasing testing complexity and time costs. Moreover, the inability of the test oil temperature to quickly reach the required high or low temperatures further limits testing efficiency and accuracy.

[0005] Therefore, it is necessary to design a multifunctional testing device that can automatically build up pressure, reduce pressure, vent air, and detect pipeline stiffness in order to improve testing efficiency and accuracy, and to solve the above problems by providing a high and low temperature performance testing device for solenoid valves that can comprehensively evaluate the performance of solenoid valves under different temperature conditions. Utility Model Content

[0006] The purpose of this invention is to provide a high and low temperature performance testing device for solenoid valves, so as to overcome the above-mentioned shortcomings of the existing technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A high and low temperature performance testing device for solenoid valves, comprising: The main frame module is used to install various devices; The pressure regulating module includes an energy storage unit, a pressure detection unit, and a high-pressure resistant solenoid valve. The energy storage unit has a double-layer structure, with an inner layer made of flexible material for the energy storage bladder and an outer layer of high-strength metal shell. The pressure detection unit is fixed to the top of the energy storage unit via a threaded connection and is electrically connected to the data acquisition module. The high-pressure resistant solenoid valve is installed on one side of the energy storage unit via a flange connection and is connected to the pressure detection unit. The oil circuit control module is connected to the pressure regulating module and the circulating liquid supply module. It includes an inlet pipe, a return pipe and a safety protection pipe, and the inlet pipe, the return pipe and the safety protection pipe are interconnected. The circulating liquid supply module includes a plunger pump, a liquid storage tank, a filter, and a cooling device. The plunger pump is fixed to the bottom of the main frame module by bolts, the liquid storage tank is installed on one side of the plunger pump by a bracket, the filter is installed at the outlet end of the liquid storage tank by a flange connection, and the cooling device is connected to the liquid storage tank by a pipe. The environmental simulation module includes a high and low temperature test chamber and a heating and cooling unit; the high and low temperature test chamber is fixed to one side of the main frame module by bolts, and the heating and cooling unit is connected to the high and low temperature test chamber through pipes; The buffer supply module includes a buffer container, an exhaust device, and connecting pipes. The buffer container is fixed inside the high and low temperature test chamber by bolts, the exhaust device is installed on the top of the buffer container by threaded connection, and the connecting pipes are connected to the buffer container by quick connectors. The test fixture module includes a mounting base plate, a clamping mechanism, and a sealing assembly. The mounting base plate is fixed to the top of the main frame module by bolts, the clamping mechanism is mounted on the mounting base plate by a slide rail, and the sealing assembly is fixed to the inside of the clamping mechanism by an embedded mounting method.

[0008] Preferably, the inlet pipe is composed of a solenoid valve, a flow meter, and a needle valve connected in series. The solenoid valve is fixed to the main frame module by a clamp, and the flow meter is installed downstream of the solenoid valve by bolts. The return pipe is composed of a temperature sensor, a check valve, and a connector. The check valve is fixed to the outlet end of the return pipe by a threaded connection. The safety protection pipe includes an overflow valve and a pressure relief valve. The overflow valve is fixed to the pipe by welding, and the pressure relief valve is installed downstream of the overflow valve by a threaded connection.

[0009] Preferably, the valve core of the needle valve is made of ceramic material and is fixed inside the needle valve by a threaded connection; the temperature sensor is fixed outside the return pipeline by a threaded connection, and its probe extends into the pipeline; the valve body of the one-way valve is made of brass material and is fixed at the outlet end of the return pipeline by a threaded connection.

[0010] Preferably, it also includes a processing module, which includes an industrial control host, a data acquisition module and a display terminal; the industrial control host is fixed to one side of the main frame module by bolts, the data acquisition module is connected to the industrial control host by a cable, and the display terminal is mounted on top of the industrial control host by a bracket.

[0011] Preferably, the inner layer of the energy storage unit's energy storage bladder is made of EPDM material, and the outer layer is made of 304 stainless steel material.

[0012] Preferably, it also includes a rack protection module, which includes a protective housing, a cooling fan, and a vent; the protective housing is fixed to the outside of the main frame module by bolts, the cooling fan is mounted on the top of the protective housing by screws, and the vent is located on the side of the protective housing.

[0013] The beneficial effects of this utility model are: by setting up a pressure regulating module and an oil circuit control module, this technical solution achieves precise control of pressure and flow in the pipeline, avoiding test data deviation caused by pressure fluctuations or unstable flow. The combination of the circulating liquid supply module and the buffer liquid supply module ensures the purity and temperature stability of the test oil, reducing the impact of oil contamination or temperature changes on the test results. The design of the environmental simulation module enables rapid switching between high and low temperature conditions, meeting the needs of different testing conditions and improving testing efficiency and accuracy. By optimizing the design of the test fixture module, the problem of sealing failure in traditional threaded joints was solved, improving installation efficiency and sealing performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 2 This is a schematic diagram of the pressure regulating module of a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 3 This is a schematic diagram of the energy storage module of a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 4 This is a schematic diagram of the oil circuit control module of a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 5 This is a schematic diagram of a circulating oil station module of a high and low temperature performance testing device for electromagnetic valves according to this utility model; Figure 6 This is a schematic diagram of the temperature chamber module of a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 7 This is a schematic diagram of a buffer cylinder module for a high and low temperature performance testing device for an electromagnetic valve according to this utility model; Figure 8 This is a schematic diagram of the test fixture module of a high and low temperature performance testing device for electromagnetic valves according to this utility model; Figure 9 This is a schematic diagram of the frame module of a high and low temperature performance testing device for electromagnetic valves according to this utility model; Figure 10 This is a schematic diagram of the control cabinet module of a high and low temperature performance testing device for electromagnetic valves according to this utility model; In the diagram: 1. Main frame module; 2. Energy storage module; 21. Energy storage unit; 22. Pressure detection unit; 23. High-pressure resistant solenoid valve; 3. Oil circuit control module; 31. Oil inlet pipeline; 32. Oil return pipeline; 33. Safety circuit; 4. Circulating oil station module; 41. High-pressure filter; 5. Temperature chamber module; 6. Buffer cylinder module; 61. Buffer cylinder; 62. Stainless steel connector; 63. Exhaust valve block; 7. Test fixture module; 8. Frame module; 9. Control cabinet module. Detailed Implementation

[0015] Reference Figures 1 to 10 A high and low temperature performance testing device for an electromagnetic valve includes a main frame module made of corrosion-resistant profiles and a lifting support device installed at the bottom; the lifting support device includes an adjustable height caster assembly and a locking mechanism fixed to the caster assembly; an inspection door and an operation window are provided on the outside of the main frame module. The pressure regulating module includes an energy storage unit, a pressure detection unit, and a high-pressure resistant solenoid valve. The energy storage unit has a double-layer structure, with an inner layer made of flexible material for the energy storage bladder and an outer layer of high-strength metal shell. The pressure detection unit is fixed to the top of the energy storage unit via a threaded connection and is electrically connected to the data acquisition module. The high-pressure resistant solenoid valve is installed on one side of the energy storage unit via a flange connection. The oil circuit control module includes an inlet pipeline, a return pipeline, and a safety protection pipeline. The inlet pipeline consists of a solenoid valve, a flow meter, and a needle valve connected in series. The solenoid valve is fixed to the main frame module with clamps, and the flow meter is bolted downstream of the solenoid valve. The return pipeline consists of a temperature sensor, a check valve, and a connector. The check valve is threaded to the outlet end of the return pipeline. The safety protection pipeline includes an overflow valve and a pressure relief valve. The overflow valve is welded to the pipeline, and the pressure relief valve is threaded downstream of the overflow valve. The circulating fluid supply module includes a plunger pump, a reservoir, a filter, and a cooling device. The plunger pump is bolted to the bottom of the main frame module, the reservoir is mounted on one side of the plunger pump via a bracket, the filter is flanged to the outlet end of the reservoir, and the cooling device is connected to the reservoir via a pipeline. The environmental simulation module includes a high and low temperature test chamber and a heating and cooling unit. The high and low temperature test chamber is bolted to one side of the main frame module, and the heating and cooling unit is connected to the high and low temperature test chamber via a pipeline. The test chamber is connected; the buffer supply module includes a buffer container, an exhaust device, and connecting pipes; the buffer container is fixed inside the high and low temperature test chamber with bolts, the exhaust device is installed on the top of the buffer container with a threaded connection, and the connecting pipes are connected to the buffer container through quick connectors; the test fixture module includes a mounting base plate, a clamping mechanism, and a sealing assembly; the mounting base plate is fixed to the top of the main frame module with bolts, the clamping mechanism is mounted on the mounting base plate via a slide rail, and the sealing assembly is fixed to the inside of the clamping mechanism via an embedded installation method; the frame protection module includes a protective shell, a cooling fan, and vents; the protective shell is fixed to the outside of the main frame module with bolts, the cooling fan is installed on the top of the protective shell with screws, and the vents are located on the side of the protective shell; the control and processing module includes an industrial control host, a data acquisition module, and a display terminal; the industrial control host is fixed to one side of the main frame module with bolts, the data acquisition module is connected to the industrial control host via a cable, and the display terminal is mounted above the industrial control host via a bracket.

[0016] The main frame module 1 is constructed of 4040 European standard aluminum profiles, with casters installed at the bottom for both movement and fixation. The casters have a lifting support function; when the equipment needs to be moved, the casters can be adjusted for flexible sliding; when the equipment needs to be fixed, the bottom feet of the casters can be raised to secure the machine to the ground. The main frame module 1 is equipped with open doors and inspection ports around its perimeter for easy operation and maintenance. The main frame module 1 is made of corrosion-resistant materials, suitable for low-corrosion environments, and possesses excellent structural stability, ensuring that the equipment will not deform due to vibration or external environmental influences during operation.

[0017] The energy storage module 2 includes an energy storage unit 21, a pressure detection unit 22, and a high-pressure resistant solenoid valve 23. The outer tank of the energy storage unit is made of 304 stainless steel, and the internal liquid storage bladder is made of EPDM. Both materials have excellent corrosion resistance and are suitable for harsh liquid testing environments. A high-pressure resistant solenoid valve 23 is installed above the energy storage unit for convenient selection of the pressure adjustment range during testing, thereby ensuring the stability of the pressure within the pipeline. The function of the energy storage module 2 is to stabilize the pressure within the pipeline and avoid inaccurate test data due to pressure fluctuations. During actual operation, the energy storage unit absorbs pressure fluctuations in the pipeline to maintain a constant pressure in the testing environment. The pressure detection unit monitors the pressure value within the pipeline in real time and feeds the data back to the control cabinet module 9 for analysis and processing by the testing software.

[0018] The oil circuit control module 3 consists of an inlet oil line 31, a return oil line 32, and a safety circuit 33. The inlet oil line includes a pneumatic ball valve, a Swagelok needle valve, a hydraulic sensor, and a VSE flow meter, extending from the oil station outlet to the fixture installation pressure output port. The VSE flow meter, based on the principle of meshing gears, is used to accurately measure liquid flow, ensuring the accuracy of the testing system. The pneumatic ball valve enables convenient operation of the pipeline through on / off control, while the high sealing performance of the needle valve ensures the reliability of the test results. The return oil line includes a temperature sensor, a Swagelok pneumatic ball valve, and a stainless steel connector, extending from the fixture installation pressure output port to the oil station return port, ensuring smooth oil return. The safety circuit includes a Hawes shut-off valve and an unloading valve. When the pipeline pressure rises abnormally, the unloading valve automatically releases pressure, keeping it within a safe range. Overflowing oil can also automatically return to the oil tank, improving the ease of use of the equipment. The core function of the oil circuit control module 3 is to precisely control the flow direction, flow rate, and pressure of the oil, ensuring the safety of the testing process and the accuracy of the data.

[0019] The circulating oil station module 4 consists of a German plunger pump 43, an oil tank 42, a mechanical pressure gauge, a high-pressure filter 41, and a Swagelok pneumatic ball valve. The plunger pump's drive motor is connected to the plunger pump's main shaft via a coupling, and the drive motor is bolted to one side of the plunger pump. The top of the reservoir has an injection port and a vent. The injection port is fitted with a sealing cap via a threaded connection, and the vent is connected to the outside via a pipe. The filter element is made of multi-layer stainless steel mesh and is fixed inside the filter with clips. The cooling device includes a cooling coil and a fan. The cooling coil is welded to the outside of the reservoir, and the fan is screwed to one side of the cooling coil. The plunger pump's power is adjusted by a frequency converter, thereby regulating the output pressure to complete the pressurization and venting functions. Combined with the on / off switching of the shut-off valve, it achieves pressure building, pressure release, and pressurization operations. The oil is output from the oil station's outlet and returns to the oil tank via the return port. If gas is present in the pipeline, the plunger pump can draw air-free brake fluid from the bottom of the tank and pressurize it, expelling air bubbles from the pipeline to the upper layer of the tank. This ensures the pipeline is free of gas, providing an environmental guarantee for testing the high rigidity characteristics of the product. The actual operation of the circulating oil station module 4 is as follows: After the plunger pump starts, it draws brake fluid from the tank and injects it into the oil circuit. The output pressure of the plunger pump is controlled by adjusting the frequency of the inverter. Before the test begins, the system automatically executes the venting procedure. The plunger pump pressurizes the oil and circulates it through the pipeline, expelling the gas in the pipeline to the upper layer of the tank, ensuring the purity of the testing environment.

[0020] The temperature chamber module 5 mainly consists of a high and low temperature alternating test chamber, used to provide the high and low temperature conditions required for product testing. The temperature chamber interacts with the control cabinet module 9 for convenient control, simulating the performance testing of solenoid valves under actual high and low temperature environments. The working principle of the temperature chamber module 5 is that the control cabinet module 9 sends commands to adjust the temperature setpoint of the high and low temperature alternating test chamber to reach the target test temperature. During testing, the temperature chamber module 5 can quickly respond to temperature changes, ensuring the temperature stability of the test environment. For example, when testing the performance of a solenoid valve within the range of -40℃ to 120℃, the temperature chamber module 5 can complete the temperature switching in a short time to meet the needs of different test conditions.

[0021] The buffer cylinder module 6 includes a buffer cylinder 61, a stainless steel connector 62, and an exhaust valve block 63. Its main function is to provide high and low temperature oil for solenoid valve testing and to expel gas from the cylinder through the exhaust bolt, ensuring the accuracy of the test. The actual operation process of the buffer cylinder module 6 is as follows: Before the test begins, the buffer cylinder is connected to the oil circuit through the stainless steel connector, and oil is injected into the buffer cylinder from the circulating oil station module 4. Subsequently, the buffer cylinder is placed in the temperature chamber module 5, and the oil is cooled or heated through the high and low temperature alternating test chamber to reach the target test temperature. During the test, the oil in the buffer cylinder is transported to the test fixture module 7 through pipelines to provide the solenoid valve with high and low temperature oil that meets the test conditions.

[0022] The test fixture module 7 consists of a product mounting block 71, an upper pressure block, a filter screen, a plate mounting base 72, and a sealing ring. Unlike traditional threaded joint connections, this fixture module improves installation efficiency and sealing performance, avoiding the leakage risk caused by repeated use of traditional joints. The newly added filter screen effectively filters impurities in the tested product or oil circuit, preventing damage to precision standard parts of the equipment. The actual operation process of the test fixture module 7 is as follows: The solenoid valve to be tested is mounted on the product mounting block, and then fixed to the plate mounting base by the upper pressure block. A quick connection is made between the product mounting block's connector and the solenoid valve. The sealing ring ensures a tight seal between the fixture and the solenoid valve, preventing oil leakage. During testing, oil enters the solenoid valve through the filter screen, passes through the solenoid valve, and then returns to the oil circuit, completing the performance test. The sealing ring is fixed to the inside of the connector using an embedded mounting method.

[0023] The rack module 8 is constructed from 4040 European standard aluminum profiles and stainless steel sheet metal, offering strong corrosion resistance and structural stability, making it suitable for special environments such as acidic and alkaline conditions. It is equipped with casters at the bottom for easy movement and securing. All electrical components are housed in an IP54-rated electrical control box, with external piping protected by waterproof and corrosion-resistant conduits. Ventilation vents and intake / exhaust fans are located near the bottom of the chassis for effective heat dissipation, ensuring the stability of the machine's control system. Lockable doors around the moving parts prevent direct contact with operator contact. The actual operation of rack module 8 is as follows: During operation, the control module within the electrical control box collects sensor data and sends commands to control the coordinated operation of each module. Ventilation vents and fans ensure the temperature inside the electrical control box remains within a reasonable range, preventing control system malfunctions due to overheating.

[0024] Control cabinet module 9 consists of an Advantech industrial computer, an NI data acquisition module, a display, a power supply, and motor control components, serving as the control center for the entire test bench. A cooling fan is mounted at the rear of the cabinet, and casters are installed at the bottom for easy transport and debugging. The actual operation of control cabinet module 9 is as follows: Before testing begins, the operator sets the test parameters, including test pressure, flow rate, and temperature, via the display. During testing, the NI data acquisition module collects data from various sensors in real time, including data from the pressure detection unit, hydraulic sensor, temperature sensor, and VSE flow meter, and transmits the data to the Advantech industrial computer for analysis and processing. The Advantech industrial computer controls the operating status of each module according to a preset program, ensuring the automation and accuracy of the testing process.

[0025] The operating principle of this utility model is as follows: Before the test begins, the operator sets the test parameters through the control cabinet module 9 and starts the equipment for self-testing. The S2 circulating oil station module 4 starts the plunger pump, drawing brake fluid from the oil tank and injecting it into the oil circuit. Simultaneously, it executes the venting procedure, expelling the gas in the pipeline to the upper layer of the oil tank. The S3 buffer cylinder module 6 injects the oil into the buffer cylinder, and the temperature chamber module 5 cools or heats the oil to reach the target test temperature. The S4 oil circuit control module 3 controls the flow direction and flow rate of the oil through a pneumatic ball valve and a needle valve, ensuring the stability of the test environment. The S5 test fixture module 7 installs the solenoid valve to be tested on the product mounting block, ensuring a tight seal through the upper pressure block and sealing ring. During the S6 test, the oil enters the solenoid valve through the filter screen, passes through the solenoid valve, and then returns to the oil circuit, completing the performance test. The S7 control cabinet module 9 collects data from each sensor in real time and displays the test results on the monitor for operator analysis and recording.

[0026] This invention reduces manual intervention and improves testing efficiency through automatic pressure building, pressure reduction, and venting functions. High-precision flow meters, hydraulic sensors, and temperature sensors ensure the accuracy of test data. A high-low temperature alternating test chamber and a buffer cylinder module can simulate the performance testing of solenoid valves under different temperature environments. A safety circuit design provides high-pressure safety protection, preventing abnormal pressure increases due to misoperation. The use of plate-type fixture mounting blocks improves installation efficiency and sealing, solving the leakage problem of traditional threaded joints. The main frame module and rack module are made of corrosion-resistant materials, suitable for special environments, and are equipped with casters at the bottom for easy movement and fixation.

[0027] The advantages of this utility model are that, by setting up a pressure regulating module and an oil circuit control module, this technical solution achieves precise control of pressure and flow in the pipeline, avoiding test data deviations caused by pressure fluctuations or unstable flow. By combining the circulating liquid supply module and the buffer liquid supply module, the purity and temperature stability of the test oil are ensured, reducing the impact of oil contamination or temperature changes on the test results. The design of the environmental simulation module enables rapid switching between high and low temperature conditions, meeting the needs of different testing conditions and improving testing efficiency and accuracy. By optimizing the design of the test fixture module, the problem of sealing failure in traditional threaded joints was solved, improving installation efficiency and sealing performance.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high and low temperature performance testing device for electromagnetic valves, characterized in that: It includes: The main frame module is used to install various devices; The pressure regulating module includes an energy storage unit, a pressure detection unit, and a high-pressure resistant solenoid valve. The energy storage unit has a double-layer structure, with an inner layer made of flexible material for the energy storage bladder and an outer layer of high-strength metal shell. The pressure detection unit is fixed to the top of the energy storage unit via a threaded connection and is electrically connected to the data acquisition module. The high-pressure resistant solenoid valve is installed on one side of the energy storage unit via a flange connection and is connected to the pressure detection unit. The oil circuit control module is connected to the pressure regulating module and the circulating liquid supply module. It includes an inlet pipe, a return pipe and a safety protection pipe, and the inlet pipe, the return pipe and the safety protection pipe are interconnected. The circulating liquid supply module includes a plunger pump, a liquid storage tank, a filter, and a cooling device. The plunger pump is fixed to the bottom of the main frame module by bolts, the liquid storage tank is installed on one side of the plunger pump by a bracket, the filter is installed at the outlet end of the liquid storage tank by a flange connection, and the cooling device is connected to the liquid storage tank by a pipe. The environmental simulation module includes a high and low temperature test chamber and a heating and cooling unit; the high and low temperature test chamber is fixed to one side of the main frame module by bolts, and the heating and cooling unit is connected to the high and low temperature test chamber through pipes; The buffer supply module includes a buffer container, an exhaust device, and connecting pipes. The buffer container is fixed inside the high and low temperature test chamber by bolts, the exhaust device is installed on the top of the buffer container by threaded connection, and the connecting pipes are connected to the buffer container by quick connectors. The test fixture module includes a mounting base plate, a clamping mechanism, and a sealing assembly. The mounting base plate is fixed to the top of the main frame module by bolts, the clamping mechanism is mounted on the mounting base plate by a slide rail, and the sealing assembly is fixed to the inside of the clamping mechanism by an embedded mounting method.

2. The high and low temperature performance testing equipment for a solenoid valve according to claim 1, characterized in that: The inlet pipe consists of a solenoid valve, a flow meter, and a needle valve connected in series. The solenoid valve is fixed to the main frame module by clamps, and the flow meter is installed downstream of the solenoid valve by bolts. The return pipe consists of a temperature sensor, a check valve, and a connector. The check valve is fixed to the outlet end of the return pipe by a threaded connection. The safety protection pipe includes an overflow valve and a pressure relief valve. The overflow valve is fixed to the pipe by welding, and the pressure relief valve is installed downstream of the overflow valve by a threaded connection.

3. The high and low temperature performance testing equipment for a solenoid valve according to claim 2, characterized in that: The valve core of the needle valve is made of ceramic material and is fixed inside the needle valve by a threaded connection; the temperature sensor is fixed outside the return line by a threaded connection, and its probe extends into the line; the valve body of the one-way valve is made of brass material and is fixed at the outlet end of the return line by a threaded connection.

4. The high and low temperature performance testing equipment for a solenoid valve according to claim 1, characterized in that: It also includes a control processing module, which includes an industrial control host, a data acquisition module and a display terminal; the industrial control host is fixed to one side of the main frame module by bolts, the data acquisition module is connected to the industrial control host by a cable, and the display terminal is mounted on top of the industrial control host by a bracket.

5. The high and low temperature performance testing equipment for a solenoid valve according to claim 1, characterized in that: The inner layer of the energy storage unit's energy storage bladder is made of EPDM material, and the outer layer is made of 304 stainless steel material.

6. The high and low temperature performance testing equipment for a solenoid valve according to claim 1, characterized in that: It also includes a rack protection module, which includes a protective housing, a cooling fan, and vents; the protective housing is fixed to the outside of the main frame module by bolts, the cooling fan is mounted on the top of the protective housing by screws, and the vents are located on the side of the protective housing.

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