Alternating positive and negative pressure testing device

Abstract

The utility model discloses a positive and negative pressure alternating testing arrangement, include: gas storage tank group, liquid storage tank, control valve group and environmental temperature box, wherein, gas storage tank group includes first gas storage tank and second gas storage tank, and gas storage tank group communicates with liquid storage tank through pipeline, and liquid storage tank is placed in environmental temperature box, control valve includes gas pressure control valve group and flow path control valve group, and gas pressure control valve group is used for controlling the regulation positive and negative pressure output, and flow path control valve group is used for controlling the on-off and flow path of test pipeline, in the utility model, through the automatic control adjustment of electrical proportional valve and the pneumatic path control valve group of ball valve, compressed air in gas storage tank is transported to liquid storage pipe, and cooperates multiple sets of sensors to realize accurate positive and negative pressure alternating experiment of gas push liquid mode and liquid level, temperature and pressure feedback signal closed loop control test process, and the operation is convenient and the stability is better, and then satisfies the test demand of new energy automobile industry spare part to positive and negative pressure alternation.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a positive and negative pressure alternating testing device. Background Technology

[0002] In the design and quality verification of core components of new energy vehicles, such as cooling modules that are responsible for heat dissipation of batteries, motors and electronic control systems, multi-way valves that are responsible for dynamically regulating the flow path and distribution ratio of coolant, and pipelines that serve as thermal management media, positive and negative pressure alternating pulse tests are key test items for evaluating these products. By simulating extreme pressure alternating scenarios throughout the entire life cycle of the component, positive and negative pressure impacts with preset frequency, amplitude and number of cycles are continuously applied, which can accurately evaluate its structural strength, sealing performance, material fatigue resistance and connection reliability.

[0003] Most existing pressure pulse devices on the market rely on hydraulic cylinders to pressurize hydraulic oil and push pistons to compress the test medium for testing. They can only achieve pressure pulses in the range of zero pressure to positive pressure, and cannot achieve alternating positive and negative pressure pulses. Therefore, they cannot simulate the frequent alternation of positive and negative pressure in the actual working conditions of new energy vehicle cooling systems. Moreover, these devices are easily affected by factors such as changes in hydraulic oil viscosity and wear of piston seals during long-term high-frequency operation, often resulting in problems such as pressure output fluctuations exceeding the preset error range and insufficient pulse frequency stability, leading to poor repeatability of test data. Utility Model Content

[0004] The purpose of this invention is to provide a positive and negative pressure alternating testing device to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution, including:

[0006] Air storage tank assembly, used to store and release compressed air;

[0007] Liquid storage tanks are used to store and dispense liquids.

[0008] Control valve assembly is used for automatic control and regulation of test pressure and flow path opening and closing;

[0009] An ambient temperature chamber is used to create the temperature environment to be tested.

[0010] The gas storage tank group includes a first gas storage tank and a second gas storage tank. The gas storage tank group is connected to a liquid storage tank through a pipeline. The liquid storage tank is placed in an ambient temperature chamber.

[0011] The control valve includes a pneumatic control valve group and a flow path control valve group. The pneumatic control valve group is used to control and regulate the positive and negative pressure output, and the flow path control valve group is used to control the on / off state and flow path of the test pipeline.

[0012] As a further description of the above technical solution, the pneumatic control valve group includes a positive pressure control valve and a negative pressure control valve.

[0013] As a further description of the above technical solution, the first air storage tank is connected to a compressed air source through a positive pressure control valve.

[0014] As a further description of the above technical solution, the second gas storage tank is connected to the vacuum pump through a negative pressure control valve.

[0015] As a further description of the above technical solution, the flow path control valve group includes a flow control valve and a path control valve.

[0016] As a further description of the above technical solution, the first gas storage tank and the second gas storage tank are connected to the path control valve through a flow control valve.

[0017] As a further description of the above technical solution, the path control valve is connected to the liquid storage tank through a pipeline, and the path control valve includes a first path valve and a second path valve.

[0018] As a further description of the above technical solution, the first path valve is connected to the flow control valve, and the second path valve is connected to the liquid storage tank.

[0019] As a further description of the above technical solution, a liquid level sensor is installed inside the liquid storage tank, and a temperature sensor and a pressure sensor are connected to the outside of the liquid storage tank.

[0020] As a further description of the above technical solution, the liquid storage tank is connected to the sample to be tested through a pipeline, and the sample to be tested is placed on the test stand inside the ambient temperature chamber.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention uses an electric proportional valve for automatic control and a ball valve for pneumatic path control to deliver compressed air from the gas tank to the liquid storage pipe. With the help of multiple sensors, it realizes a precise positive and negative pressure alternation experiment and a closed-loop control test process for liquid level, temperature and pressure feedback signals. It is easy to operate and has good stability, thus meeting the testing needs of the new energy vehicle industry for positive and negative pressure alternation of components.

[0023] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the positive and negative pressure alternating testing device of this utility model.

[0025] Figure label:

[0026] 1. Gas storage tank assembly; 11. First gas storage tank; 12. Second gas storage tank; 2. Liquid storage tank; 3. Control valve assembly; 31. Pressure control valve assembly; 311. Positive pressure control valve; 312. Negative pressure control valve; 32. Flow path control valve assembly; 321. Flow control valve; 322. Path control valve; 323. First path valve; 324. Second path valve; 4. Ambient temperature chamber; 5. Compressed air source; 6. Vacuum pump; 7. Sample to be tested; 8. Liquid level sensor; 9. Temperature sensor; 10. Pressure sensor. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, in one embodiment, a positive and negative pressure alternating test device includes: a gas storage tank group 1, a liquid storage tank 2, a control valve group 3, and an ambient temperature chamber 4.

[0029] Among them, the air storage tank group 1 is used to store and release compressed air, and the liquid storage tank 2 is used to store and output liquid; correspondingly, the control valve group 3 realizes the precise adjustment of test pressure and the flexible switching of flow path through automatic control, while the ambient temperature chamber 4 can simulate the temperature environment in actual vehicle operation, creating a stable and controllable test temperature condition for testing.

[0030] For example, the gas storage tank group 1 includes a first gas storage tank 11 and a second gas storage tank 12, and the gas storage tank group 1 is connected to the liquid storage tank 2 through a pressure-resistant pipeline;

[0031] Correspondingly, the control valves include a pneumatic control valve group 31 and a flow path control valve group 32. The pneumatic control valve group 31 achieves stable output of positive and negative pressure through precise adjustment, while the flow path control valve group 32 can control the on / off state of each section of the pipeline and the dynamic switching of the flow path.

[0032] Specifically, the pneumatic control valve assembly 31 includes a positive pressure control valve 311 and a negative pressure control valve 312. To achieve high-precision pressure control, both the positive pressure control valve 311 and the negative pressure control valve 312 are electric proportional valves, which can accurately adjust the output pressure proportionally according to the input electrical signal. They have fast response speed and high control accuracy, ensuring that the pressure rise rate and peak pressure of the positive pressure output, as well as the pressure drop rate and ultimate negative pressure of the negative pressure output, strictly meet the test standards and satisfy the precise control requirements of alternating positive and negative pressures.

[0033] For example, the first air storage tank 11 is connected to the compressed air source 5 through the positive pressure control valve 311, so that the compressed air source 5 can stably deliver initial compressed air to the first air storage tank 11 for storage. The compressed air in the air storage tank serves as the positive pressure source in the pressure alternation test and can be released as needed to provide continuous and stable positive pressure power to simulate positive pressure usage conditions.

[0034] Correspondingly, the second gas storage tank 12 is connected to the vacuum pump 6 through the negative pressure control valve 312, so that the vacuum pump 6 can extract the air inside the second gas storage tank 12, so that a stable negative pressure state is formed inside the second gas storage tank 12, which serves as a source of alternating negative pressure to simulate negative pressure operating conditions.

[0035] Furthermore, the flow path control valve assembly 32 includes a flow control valve 321 and a path control valve 322, while the first gas storage tank 11 and the second gas storage tank 12 are respectively connected to the path control valve 322 through a set of flow control valves 321, and the path control valve 322 is connected to the liquid storage tank 2 through a pipeline.

[0036] Specifically, the flow control valve 321 is a ball valve, which precisely controls the gas flow from the gas storage tank to the path control valve 322 according to the test requirements, avoiding a sudden pressure rise due to excessive flow or insufficient pressure due to insufficient flow, thus ensuring the stability of the pressure transmission process; while the path control valve 322 includes a first path valve 323 and a second path valve 324. The first path valve 323 is used to switch between positive and negative pressure test paths, and the second path valve 324 is used to control the on / off of positive and negative pressure sources;

[0037] The first path valve 323 is a three-way pneumatic ball valve. It is connected to the flow control valve 321 and can quickly switch between positive pressure path, negative pressure path and closed state, effectively ensuring the response speed of path conversion. The second path valve 324 is a two-way pneumatic ball valve. It is connected to the liquid storage tank 2 and can realize the full opening or full closing of the passage through pneumatic control, ensuring that the connection state between the liquid storage tank 2 and the pressure source is controllable.

[0038] Please continue reading. Figure 1 In this embodiment, the liquid storage tank 2 is placed inside the ambient temperature chamber 4 to ensure that the temperature of the test medium inside the liquid storage tank 2 is not affected by the external environment and is stably controlled within the preset test temperature range.

[0039] Specifically, a liquid level sensor 8 is installed inside the liquid storage tank 2 to detect the liquid level of the test medium inside the liquid storage tank 2 in real time, and to provide timely feedback on the remaining amount of medium to avoid affecting the continuity of the test due to insufficient medium; while a temperature sensor 9 and a pressure sensor 10 are connected to the outside of the liquid storage tank 2. The temperature sensor 9 can monitor the actual temperature of the test medium inside the liquid storage tank 2 in real time, and the pressure sensor 10 can accurately collect the real-time pressure value inside the tank.

[0040] Furthermore, the storage tank 2 is connected to the sample 7 to be tested via a pipeline, and the sample 7 to be tested is placed on the test stand inside the ambient temperature chamber 4.

[0041] The gas-pumped liquid drive method in storage tank 2 utilizes the compressibility and elasticity of gas to form a natural buffer mechanism. When pressure fluctuates instantaneously, the gas can absorb the impact energy through volume changes, effectively avoiding the risk of overpressure caused by pressure runaway; from the control unit (as prior art), Figure 1 (Not shown in the image) sends a pressure regulation signal to the sensor to collect feedback data such as pressure and temperature, forming a complete control-monitoring-feedback closed loop system. When abnormal situations such as abnormal pressure, excessive temperature, or media leakage occur during the test, the system can quickly identify and automatically trigger shutdown protection to prevent the fault from escalating. All abnormal data will be recorded in real time, providing convenience for subsequent fault analysis and test data traceability.

[0042] For example, the following test parameters are applied to the sample 7 to be tested during the test:

[0043] (1) Minimum test pressure Pmin: 0.5 (-0.1) barabs; (Note that 0.5 Bar is the absolute pressure, and the relative pressure is approximately -50 kPa);

[0044] (2) Maximum test pressure Pmax: 2.0 (+0.1) barabs; (Note that 2 Bar is an absolute pressure, and the relative pressure is approximately 150 kPa);

[0045] (3) Pressure pulsation frequency: 25 to 35 times / min; approximately 0.5 Hz;

[0046] (4) Number of pressure changes: 100,000;

[0047] (5) Test temperature: Tcoo1=90±2℃.

[0048] Working principle: The first gas storage tank 11 is connected to the compressed air source 5 via the positive pressure control valve 311 to store positive pressure gas. The second gas storage tank 12 is connected to the vacuum pump 6 via the negative pressure control valve 312 to form a negative pressure environment. The positive and negative pressures are precisely regulated by the gas pressure control valve group 31, which is composed of electro-proportional valves. The flow control valve group 32 controls the flow rate of the gas. The first path valve 323 switches the positive and negative pressure test paths. The second path valve 324 controls the connection and disconnection between the pressure source and the liquid storage tank 2, so that the positive and negative pressure gases are orderly transmitted to the liquid storage tank 2 placed in the ambient temperature chamber 4. The medium is pushed into the test sample 7, which is also in the temperature chamber, through the pressure-resistant pipeline by the gas-push liquid method. At the same time, the liquid level sensor 8 in the tank and the external temperature and pressure sensors 10 monitor the parameters in real time. The machine automatically stops when there is an abnormality. Finally, the accurate simulation test of the sample under the alternating positive and negative pressure conditions in the preset temperature environment is realized.

[0049] Through the above technical solution, this application provides a positive and negative pressure alternating test device using a pneumatic-liquid method. Compressed air from the gas storage tank is delivered to the liquid storage pipe through automatic control and adjustment of an electro-proportional valve and pneumatic path control of a ball valve. Combined with multiple sets of sensors, it achieves precise positive and negative pressure alternating experiments and closed-loop control testing of liquid level, temperature, and pressure feedback signals using a pneumatic-liquid method. It is easy to operate and has good stability, meeting the testing requirements of various standards for positive and negative pressure alternating test equipment in the new energy vehicle industry, and overcoming the technical deficiency of existing equipment that cannot perform negative and positive pressure alternation.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positive and negative pressure alternating testing device, characterized in that, include: Air storage tank assembly (1), used for storing and releasing compressed air; Storage tank (2), used for storing and discharging liquid; The control valve assembly (3) is used for automatic control and adjustment of the test pressure and the on / off state of the flow path; An ambient temperature chamber (4) is used to create the temperature environment to be tested; The gas storage tank group (1) includes a first gas storage tank (11) and a second gas storage tank (12). The gas storage tank group (1) is connected to the liquid storage tank (2) through a pipeline. The liquid storage tank (2) is placed in an ambient temperature chamber (4). The control valve includes a pneumatic control valve group (31) and a flow path control valve group (32). The pneumatic control valve group (31) is used to control and regulate the positive and negative pressure output, and the flow path control valve group (32) is used to control the on / off state and flow path of the test pipeline.

2. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The pneumatic control valve assembly (31) includes a positive pressure control valve (311) and a negative pressure control valve (312).

3. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The first air storage tank (11) is connected to the compressed air source (5) through a positive pressure control valve (311).

4. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The second gas storage tank (12) is connected to the vacuum pump (6) through the negative pressure control valve (312).

5. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The flow path control valve assembly (32) includes a flow control valve (321) and a path control valve (322).

6. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The first gas storage tank (11) and the second gas storage tank (12) are connected to the path control valve (322) through the flow control valve (321).

7. The positive and negative pressure alternating testing device according to claim 5, characterized in that, The path control valve (322) is connected to the liquid storage tank (2) through a pipeline. The path control valve (322) includes a first path valve (323) and a second path valve (324).

8. The positive and negative pressure alternating testing device according to claim 7, characterized in that, The first path valve (323) is connected to the flow control valve (321), and the second path valve (324) is connected to the storage tank (2).

9. The positive and negative pressure alternating testing device according to claim 1, characterized in that, The liquid storage tank (2) is equipped with a liquid level sensor (8) inside, and a temperature sensor (9) and a pressure sensor (10) are connected to the outside of the liquid storage tank (2).

10. The positive and negative pressure alternating testing device according to claim 9, characterized in that, The storage tank (2) is connected to the sample to be tested (7) through a pipeline, and the sample to be tested (7) is placed on the test stand inside the ambient temperature chamber (4).

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