A sealed membrane test device

Abstract

This utility model relates to the field of mechanical seal testing technology, specifically disclosing a sealing diaphragm testing device, including a tooling assembly comprising a base, a top cover, a spring, a gasket, and a diaphragm to be tested. The top of the base has a mounting groove for accommodating the diaphragm to be tested. The side wall of the mounting groove is provided with an air inlet and an air outlet communicating with the mounting groove. The top cover and the base are detachably connected. The center of the top cover has a through-hole for air passage connection. The device accurately replicates the working state of the diaphragm in a real valve through a contoured tooling structure, eliminating interference from other components and directly quantifying the diaphragm's sealing performance. The multi-valve air path can flexibly simulate various working conditions. Combined with multi-point pressure monitoring and automatic control, it significantly improves testing accuracy and efficiency. The device has a compact structure and is easy to operate, suitable for R&D verification and production quality inspection, providing a dedicated means for diaphragm reliability assessment and effectively improving the quality control level of core components of the braking system.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal testing technology, and specifically discloses a sealing diaphragm testing device. Background Technology

[0002] In the compressed air braking systems of motor vehicles and rail vehicles, the ABS regulating valve is one of the core components ensuring braking safety and reliability. This valve typically contains a flexible, disc-shaped sealing diaphragm. This diaphragm not only provides a traditional sealing function, but more importantly, it participates in the pressure regulation process within the valve chamber. Its performance directly determines the overall reliability and service life of the ABS regulating valve.

[0003] Currently, the performance evaluation of this sealing diaphragm, especially its sealing and reliability testing, generally employs indirect testing methods. This involves performing performance tests on the entire ABS control valve assembly to indirectly reflect the diaphragm's condition. However, due to the complex internal structure of the valve body, involving multiple seals and moving parts, failure or performance degradation at any point can affect the final test results, making it impossible to accurately and directly determine whether the diaphragm itself has defects or performance degradation. This method not only makes it difficult to guarantee the accuracy of the test results, but also requires disassembling the entire valve body and checking each component individually when a problem is discovered. This process is cumbersome, inefficient, and results in a significant waste of time and resources. Utility Model Content

[0004] This invention proposes a diaphragm testing device that accurately reproduces the working state of the diaphragm in a real valve through a contour tooling structure, eliminates interference from other components, and directly quantifies the diaphragm sealing performance.

[0005] This utility model is implemented as follows: a sealing diaphragm testing device, comprising:

[0006] The tooling assembly includes a base, a top cover, a spring, a gasket, and a diaphragm to be tested. The top of the base has a mounting groove for accommodating the diaphragm to be tested. The side wall of the mounting groove has an air inlet and an air outlet communicating with the mounting groove. The top cover and the base are detachably connected. The center of the top cover has a through air passage connection hole. The spring is located inside the top cover, and the gasket is located between the spring and the diaphragm to be tested.

[0007] The air circuit control component is connected to the air inlet and outlet ports of the tooling component via pipelines.

[0008] As a preferred embodiment of the sealing diaphragm testing device of this utility model, the side wall height of the mounting groove is 90%-95% of the total height of the diaphragm to be tested, and the gasket is a rigid gasket with a diameter difference between the diameter of the gasket and the diameter of the sealing area of ​​the diaphragm to be tested within ±0.1mm.

[0009] As a preferred embodiment of the sealing diaphragm testing device of this utility model, the gas path control component includes:

[0010] The first shut-off valve has its inlet end used to connect to an external air source;

[0011] The second shut-off valve has its input end connected to the pipeline between the output end of the first shut-off valve and the air inlet, and its output end is open to the atmosphere.

[0012] The third shut-off valve has its input end connected to the pipeline between the output end of the first shut-off valve and the air inlet port.

[0013] The fourth shut-off valve has its inlet connected to the outlet port and its outlet open to the atmosphere.

[0014] As a preferred embodiment of the sealing diaphragm testing device of this utility model, the gas path control component further includes:

[0015] The first pressure sensor is located at the air intake port and is used to detect the air intake pressure.

[0016] The second pressure sensor is located at the air outlet and is used to detect the air outlet pressure.

[0017] The third pressure sensor is mounted on the base, with its detection end located at the bottom of the mounting slot, and is used to detect the pressure in the tooling chamber.

[0018] As a preferred embodiment of the sealing diaphragm testing device of this utility model, the first stop valve, the second stop valve, the third stop valve and the fourth stop valve are all solenoid valves.

[0019] In a preferred embodiment of the sealing diaphragm testing device of this utility model, the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve are all electrically connected to an external central controller, and the signal output terminals of the first pressure sensor, the second pressure sensor and the third pressure sensor are all connected to the central controller.

[0020] The beneficial effects of this utility model are:

[0021] This device accurately replicates the working state of the diaphragm in a real valve through a contoured tooling structure, eliminating interference from other components and directly quantifying the diaphragm's sealing performance. The multi-valve air path can flexibly simulate various working conditions. Combined with multi-point pressure monitoring and automatic control, it significantly improves testing accuracy and efficiency. The device is compact and easy to operate, making it suitable for R&D verification and production quality inspection. It provides a dedicated means for diaphragm reliability assessment and effectively improves the quality control level of core components of the braking system. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is an enlarged structural diagram of the base of this utility model.

[0025] The markings in the diagram are: 1. Base; 2. Top cover; 3. Spring; 4. Gasket; 5. Diaphragm to be tested; 6. Mounting slot; 7. Air inlet; 8. Air outlet; 9. Air connection hole; 10. First pressure sensor; 11. Second pressure sensor; 12. Third pressure sensor; 13. First shut-off valve; 14. Second shut-off valve; 15. Third shut-off valve; 16. Fourth shut-off valve. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0027] Please see Figure 1-2 A sealing diaphragm testing device, comprising:

[0028] The tooling assembly includes a base 1, a top cover 2, a spring 3, a gasket 4, and a diaphragm to be tested 5. The top of the base 1 has a mounting groove 6 for accommodating the diaphragm to be tested 5. The side wall of the mounting groove 6 is provided with an air inlet 7 and an air outlet 8 that communicate with the mounting groove 6. The top cover 2 and the base 1 are detachably connected. The center of the top cover 2 has a through air passage connection hole 9. The spring 3 is located inside the top cover 2, and the gasket 4 is located between the spring 3 and the diaphragm to be tested 5.

[0029] The air circuit control component is connected to the air inlet 7 and air outlet 8 of the tooling component via pipelines.

[0030] In this embodiment: A mounting groove 6 is formed on the top of the base 1 for precise positioning and accommodating the diaphragm 5 to be tested. The height of the side wall of the mounting groove 6 is strictly controlled to be 90%-95% of the total height of the diaphragm 5 to limit excessive deformation while ensuring effective contact of the sealing surface. The top cover 2 is detachably connected to the base 1 by bolts and pressure is introduced through the central air passage connection hole 9. The spring 3 provides the design preload with a stiffness value of 5N / mm to 8N / mm. A rigid gasket 4 with a diameter within ±0.1mm tolerance of the sealing area of ​​the diaphragm 5 ensures that pressure is applied evenly to the sealing area of ​​the diaphragm 5, so that the deformation and fit of the diaphragm 5 during testing are highly consistent with the actual valve operating conditions. The air passage control component is connected to the air source through the first shut-off valve 13, and forms a multi-mode air system via the second shut-off valve 14 for atmospheric exhaust, the third shut-off valve 15 for pressure input, and the fourth shut-off valve 16 for chamber exhaust. The test system precisely simulates the diaphragm's pressure boosting, holding, and depressurization cycles by controlling the on / off sequence of the valve group. The first pressure sensor 10 monitors the inlet pressure, the second pressure sensor 11 monitors the outlet pressure, and the third pressure sensor 12 is directly installed at the bottom center of the mounting slot 6 to detect chamber pressure changes in real time. The diaphragm leakage rate is directly quantified by calculating the pressure difference P30 and P10 during the holding phase. The entire test device can be placed in a temperature-controlled chamber for high and low temperature alternating tests from -40℃ to 85℃. After completing 8 million cycles of 1Hz frequency fatigue tests, the diaphragm thickness, height, and roughness changes are remeasured. Finally, by comparing the dimensional data and sealing performance curves before and after the test, the sealing reliability, temperature resistance, and durability of the diaphragm under extreme temperatures and alternating stress are comprehensively evaluated. This solves the industry problem that traditional indirect testing methods cannot isolate component interference and cannot directly reflect diaphragm performance.

[0031] As a technical optimization of this utility model, the side wall height of the mounting groove 6 is 90%-95% of the total height of the diaphragm 5 to be tested, and the gasket 4 is a rigid gasket with a diameter difference from the sealing area diameter of the diaphragm 5 to be tested within ±0.1mm.

[0032] In this embodiment, the deformation range of the diaphragm 5 under test is limited by physical structure and the pressure is evenly distributed, which not only simulates the actual valve body sealing surface constraint conditions, but also avoids misjudgment of local leakage due to assembly deviation.

[0033] As a technical optimization of this utility model, the gas path control component includes:

[0034] The first shut-off valve 13 has its input end used to connect to an external air source;

[0035] The second shut-off valve 14 has its input end connected to the pipeline between the output end of the first shut-off valve 13 and the air inlet 7, and its output end is open to the atmosphere.

[0036] The third shut-off valve 15 has its input end connected to the pipeline between the output end of the first shut-off valve 13 and the air inlet 7.

[0037] The fourth shut-off valve 16 has its input end connected to the air outlet 8 and its output end open to the atmosphere.

[0038] In this embodiment: the second shut-off valve 14 is connected in parallel to the air intake circuit. When it is opened, it quickly releases pressure to achieve pressure holding state switching. The fourth shut-off valve 16 independently controls the air outlet channel and forms pressure boosting and depressurization with the third shut-off valve 15, restoring the working logic of the ABS valve.

[0039] As a technical optimization of this utility model, the gas path control component also includes:

[0040] The first pressure sensor 10 is located at the air intake port 7 and is used to detect the air intake pressure;

[0041] The second pressure sensor 11 is located at the air outlet 8 and is used to detect the air outlet pressure;

[0042] The third pressure sensor 12 is mounted on the base 1, with its detection end located at the bottom of the mounting groove 6, and is used to detect the pressure in the tooling chamber.

[0043] In this embodiment: the first pressure sensor 10 monitors input pressure fluctuations, the second pressure sensor 11 captures residual pressure difference in exhaust gas, and the third pressure sensor 12 directly measures the chamber pressure.

[0044] As a technical optimization of this utility model, the first shut-off valve 13, the second shut-off valve 14, the third shut-off valve 15 and the fourth shut-off valve 16 are all solenoid valves.

[0045] In this embodiment: the first shut-off valve 13, the second shut-off valve 14, the third shut-off valve 15 and the fourth shut-off valve 16 are all solenoid valves. The electronic control drive improves the response speed and accuracy, and realizes high-frequency testing and automated control.

[0046] As a technical optimization of this utility model, the first shut-off valve 13, the second shut-off valve 14, the third shut-off valve 15 and the fourth shut-off valve 16 are all electrically connected to an external central controller, and the signal output terminals of the first pressure sensor 10, the second pressure sensor 11 and the third pressure sensor 12 are all connected to the central controller.

[0047] In this embodiment, all shut-off valves and sensors are connected to a central controller. The central controller issues commands according to a preset program to drive the solenoid valves to operate, while simultaneously collecting pressure data from all sensors in real time, thus improving testing efficiency.

[0048] The working principle and usage process of this utility model are as follows: During testing, the diaphragm 5 to be tested is first placed in the mounting groove 6 of the base 1. After installing the gasket 4 and spring 3 in sequence, the upper cover 2 is tightened to form a sealed cavity. The tooling is connected to the gas path control component through the air inlet 7 and the air outlet 8. An external air source is connected through the first shut-off valve 13. By controlling the opening of the first shut-off valve 13 and the third shut-off valve 15, high-pressure gas enters the chamber through the air inlet 7 and is pressurized. Under the action of air pressure, the diaphragm 5 to be tested deforms and fits the sealing surface. During the pressure holding stage, the third shut-off valve 15 is closed, and the pressure decay in the chamber is monitored by the third pressure sensor 12. The leakage rate is calculated by reducing the value; during the depressurization phase, the second shut-off valve 14 and the fourth shut-off valve 16 are opened to exhaust gas, while the first pressure sensor 10 and the second pressure sensor 11 monitor the balance of intake and exhaust pressure respectively; during the test, the central controller controls the opening and closing sequence of the first shut-off valve 13, the second shut-off valve 14, the third shut-off valve 15 and the fourth shut-off valve 16 according to the program, and synchronously collects the data of the first pressure sensor 10, the second pressure sensor 11 and the third pressure sensor 12. The diaphragm sealing performance and durability are comprehensively evaluated by analyzing parameters such as pressure rise rate, pressure drop, and exhaust efficiency.

[0049] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A sealed diaphragm testing device, characterized by: include: The tooling assembly includes a base (1), a top cover (2), a spring (3), a gasket (4), and a diaphragm to be tested (5). The top of the base (1) is provided with a mounting groove (6) for accommodating the diaphragm to be tested (5). The side wall of the mounting groove (6) is provided with an air inlet (7) and an air outlet (8) communicating with the mounting groove (6). The top cover (2) and the base (1) are detachably connected. The center of the top cover (2) is provided with a through air passage connection hole (9). The spring (3) is located inside the top cover (2). The gasket (4) is located between the spring (3) and the diaphragm to be tested (5). The air circuit control component is connected to the air inlet (7) and air outlet (8) of the tooling component via a pipeline.

2. A sealed membrane test device according to claim 1, wherein: The side wall height of the mounting groove (6) is 90%-95% of the total height of the diaphragm (5) to be tested, and the gasket (4) is a rigid gasket with a diameter that is within ±0.1mm of the diameter of the sealing area of ​​the diaphragm (5) to be tested.

3. A sealed membrane test device according to claim 1, wherein: The gas path control component includes: The first shut-off valve (13) has its input end used to connect to an external air source; The second shut-off valve (14) has its input end connected to the pipeline between the output end of the first shut-off valve (13) and the air inlet (7), and its output end is open to the atmosphere. The third shut-off valve (15) has its input end connected to the pipeline between the output end of the first shut-off valve (13) and the air inlet (7); The fourth shut-off valve (16) has its input end connected to the air outlet (8) and its output end open to the atmosphere.

4. A sealed membrane test device according to claim 3, wherein: The gas path control component also includes: The first pressure sensor (10) is located at the air intake port (7) and is used to detect the air intake pressure; The second pressure sensor (11) is located at the air outlet (8) and is used to detect the air outlet pressure; The third pressure sensor (12) is mounted on the base (1), with its detection end located at the bottom of the mounting groove (6), and is used to detect the pressure in the tooling chamber.

5. The sealing diaphragm testing device according to claim 4, characterized in that: The first shut-off valve (13), the second shut-off valve (14), the third shut-off valve (15) and the fourth shut-off valve (16) are all solenoid valves.

6. The sealing diaphragm testing device according to claim 5, characterized in that: The first shut-off valve (13), the second shut-off valve (14), the third shut-off valve (15) and the fourth shut-off valve (16) are all electrically connected to an external central controller, and the signal output terminals of the first pressure sensor (10), the second pressure sensor (11) and the third pressure sensor (12) are all connected to the central controller.

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