Membrane testing device

Abstract

The utility model belongs to the technical field of diaphragm testing, and provides a diaphragm testing device which comprises a pressure storage tank used for introducing compressed gas for pressurization; the test box is used for accommodating a diaphragm to be tested, and the test box is connected with the pressure storage tank through a gas pipeline; the first valve is arranged between the pressure storage tank and the test box, the first valve is used for controlling opening and closing of the pressure storage tank, and the first valve is located at the upstream of the test box; the second valve is arranged at the downstream of the test box and is used for sealing the downstream of the test box; the first pressure gauge is arranged between the test box and the second valve and is used for monitoring a bubble point pressure value passing through the diaphragm to be tested; the pressure value when the compressed gas passes through the diaphragm to be tested is monitored through the first pressure gauge, when the pressure value of the first pressure gauge suddenly changes, the pressure value at the moment is the bubble point pressure value of the diaphragm to be tested, bubble point testing of the diaphragm to be tested is achieved, measurement errors caused by a visual method are avoided, and the accuracy of diaphragm testing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diaphragm testing, in particular to a diaphragm testing device. BACKGROUND

[0002] The diaphragm bubble point testing method is used to test whether the diaphragm aperture meets the process requirements. According to the international standard ASTM F316, the commonly used diaphragm bubble point testing method in the industry is the visual method. The diaphragm is pressurized, and then the pressure when a series of bubbles are generated is observed by the naked eye, which is the bubble point of the tested diaphragm.

[0003] In the related art of diaphragm testing, when the visual method is used for testing, different testers have different judgment methods for a series of bubbles, which leads to inconsistent test data and large test result errors. CONTENT OF THE UTILITY MODEL

[0004] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a diaphragm testing device to solve the problem of large test result errors in the prior art diaphragm testing method using the visual method.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a diaphragm testing device, comprising:

[0006] A pressure tank is used to introduce compressed gas for pressurization.

[0007] A test box is used to accommodate the diaphragm to be tested, and the test box and the pressure tank are connected through a gas pipeline.

[0008] A first valve is arranged between the pressure tank and the test box, and is used to control the opening and closing of the pressure tank. The first valve is located upstream of the test box.

[0009] A second valve is arranged downstream of the test box and is used to close the downstream of the test box.

[0010] A first pressure gauge is arranged between the test box and the second valve and is used to monitor the bubble point pressure value through the diaphragm to be tested.

[0011] Optionally, the test box is provided with one or more, the gas pipeline includes a main pipeline and one or more auxiliary pipelines, the main pipeline is used to connect the pressure tank with each auxiliary pipeline, each auxiliary pipeline is connected with each other through the main pipeline, the first valve is arranged on the main pipeline, and the test box is arranged on the corresponding auxiliary pipeline.

[0012] Optionally, a shunt valve for shunting compressed gas is arranged on the main pipeline, and the shunt valve is located downstream of the first valve.

[0013] Optionally, a second pressure gauge for monitoring the pressure value of the compressed gas after passing through the shunt valve is arranged on the main pipeline, and the second pressure gauge is located downstream of the shunt valve.

[0014] Optionally, a first pressure relief valve for pressure relief is arranged on the main pipeline, and the first pressure relief valve is located downstream of the shunt valve.

[0015] Optionally, an overpressure valve for controlling the opening and closing of the auxiliary pipeline is arranged on each of the auxiliary pipelines, and the overpressure valve is located upstream of the test box.

[0016] Optionally, a second pressure relief valve and a third pressure relief valve for pressure relief are arranged on two sides of the test box respectively, the second pressure relief valve is arranged between the overpressure valve and the test box, and the third pressure relief valve is arranged between the test box and the second valve.

[0017] Optionally, the test box, the third pressure relief valve, the first pressure gauge, and the second valve are connected through a cross connection pipe.

[0018] Optionally, the auxiliary pipelines are arranged in parallel and are in communication with the main pipeline at the same time.

[0019] Optionally, a liquid storage cavity for storing liquid is arranged in the test box, and a clamp for fixing the to-be-tested diaphragm is arranged on the liquid storage cavity.

[0020] In the diaphragm testing device provided in the application, first, the to-be-tested diaphragm is placed in the test box, the first valve is opened, the second valve is closed, the pressure storage tank is connected to the compressed gas for pressurization, when the pressurization reaches the test pressure, the first valve is closed, the pressure value of the compressed gas passing through the to-be-tested diaphragm is monitored through the first pressure gauge, when the pressure value of the first pressure gauge changes suddenly, the pressure value at this moment is the bubble point pressure value of the to-be-tested diaphragm, the bubble point test of the to-be-tested diaphragm is realized, the measurement error caused by the visual method is avoided, and the accuracy of the diaphragm test is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a diaphragm testing device according to Embodiment One of the application.

[0022] PART NUMBER EXPLANATION

[0023] 1-pressure storage tank; 2-main pipeline; 3-first valve; 4-shunt valve; 5-first pressure relief valve; 6-second pressure gauge; 7-overpressure valve; 8-test box; 9-second pressure relief valve; 10-third pressure relief valve; 11-second valve; 12-first pressure gauge; 13-auxiliary pipeline. DETAILED DESCRIPTION

[0024] The following embodiments of the application are illustrated by way of example with reference to the accompanying drawings, in which like reference numerals refer to like elements, and in which:

[0025] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of the present disclosure are merely used to illustrate the content disclosed in the present disclosure for the understanding and reading of those skilled in the art, and are not used to limit the conditions that can be implemented by the present application, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "front", "back", "left", "right", "middle" and "one" used in the present disclosure are merely for the clarity of the description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship without substantially changing the technical content is also considered as the scope of the present application.

[0026] It should be noted that the membrane test is to monitor the upstream and downstream pressures of the membrane to determine the bubble point and diffusion flow. During the test, when the downstream pressure of the membrane suddenly changes, it means that the gas has passed through the smallest hole in the membrane at this pressure. At this time, a series of bubbles will be generated downstream of the membrane, and the pressure at this time is the minimum pressure required for the liquid to be discharged from these holes (bubble point pressure value). The existing technology uses visual method, and different test personnel have different observation methods for bubbles, which leads to different test results of the same sample by different test personnel, resulting in errors, and the test results cannot be reproduced, and the accuracy of the test results cannot be determined.

[0027] Please refer to Figure 1 The present disclosure exemplarily provides a membrane test device, which comprises:

[0028] The pressure tank 1 is used to introduce compressed gas for pressurization;

[0029] The test box 8 is used to accommodate the membrane to be tested, and the test box 8 is connected with the pressure tank 1 through the gas pipeline;

[0030] The first valve 3 is arranged between the pressure tank 1 and the test box 8, and the first valve 3 is used to control the opening and closing of the pressure tank 1, and the first valve 3 is located upstream of the test box 8;

[0031] The second valve 11 is arranged downstream of the test box 8 and is used to close the downstream of the test box 8;

[0032] The first pressure gauge 12 is arranged between the test box 8 and the second valve 11 and is used to monitor the bubble point pressure value passing through the membrane to be tested.

[0033] In the membrane test device provided in the application, first, the to-be-tested membrane is placed in the test box 8, the first valve 3 is opened, the second valve 11 is closed, the compressed gas is introduced into the pressure storage tank 1 to pressurize, when the pressure reaches the test pressure, the first valve 3 is closed, the pressure value of the compressed gas passing through the to-be-tested membrane is monitored through the first pressure gauge 12, when the pressure value of the first pressure gauge 12 suddenly changes, the pressure value at this time is the bubble point pressure value of the to-be-tested membrane, the bubble point test of the to-be-tested membrane is realized, the measurement error caused by the visual method is avoided, and the accuracy of the membrane test is improved.

[0034] It should be noted that, in the membrane test process, when the pressure of the gas passing through the membrane reaches 80% of the bubble point pressure value, at this time, a large amount of gas has not yet passed through the perforation, only a small amount of gas is dissolved into the liquid phase of the diaphragm, and then diffuses from the liquid phase to the gas phase of the other side, this part of gas is called diffusion flow, the specific bubble point pressure value is obtained by monitoring the pressure value of the compressed gas passing through the to-be-tested membrane through the first pressure gauge 12, and the diffusion flow test of the membrane can be performed synchronously according to the pressure value.

[0035] In the embodiment, the test box 8 is provided with one or more gas pipelines, the gas pipeline includes the main pipeline 2 and one or more auxiliary pipelines 13, the main pipeline 2 is used for connecting the pressure storage tank 1 and each auxiliary pipeline 13, each auxiliary pipeline 13 is communicated with each other through the main pipeline 2, the first valve 3 is arranged on the main pipeline 2, and the test box 8 is arranged on the corresponding auxiliary pipeline 13. Specifically, the auxiliary pipelines 13 are arranged in parallel and are in communication with the main pipeline 2 at the same time, the parallel arrangement of the plurality of auxiliary pipelines 13 and the arrangement of the test box 8 on each auxiliary pipeline 13 can enable a plurality of membranes in the same batch to be tested under the condition that the upstream gas source is simultaneously connected, the system error caused by the test system is reduced, and the accuracy of the test result is further improved.

[0036] In some embodiments, the main pipeline 2 is provided with a shunt valve 4 for shunting the compressed gas, the shunt valve 4 is located downstream of the first valve 3, the compressed gas introduced into the main pipeline 2 is shunted through the shunt valve 4, and the distribution of the gas introduced into the auxiliary pipeline 13 is ensured to be uniform. Specifically, the compressed gas can be nitrogen or air, which is not limited herein.

[0037] In the embodiment, the main pipeline 2 is further provided with a second pressure gauge 6 for monitoring the pressure value of the compressed gas after passing through the shunt valve 4, the second pressure gauge 6 is located downstream of the shunt valve 4, the pressure of the shunted gas is monitored through the second pressure gauge 6, and when the gas pressure reaches the pressure value of the membrane test, the first valve 3 is closed for testing.

[0038] In some embodiments, a first pressure relief valve 5 is arranged on the main pipe 2 for pressure relief, and the first pressure relief valve 5 is arranged downstream of the shunt valve 4. After the test is completed, the excess gas in the main pipe 2 is discharged through the first pressure relief valve 5 to relieve the pressure of the main pipe 2.

[0039] In the above embodiment, the overpressure valve 7 is arranged on the auxiliary pipe 13 for controlling the opening and closing of the auxiliary pipe 13, and the overpressure valve 7 is arranged upstream of the test box 8. According to the number of diaphragms, the diaphragms are placed in the test box 8, and the corresponding auxiliary pipe 13 is connected with the main pipe 2 through the opening of the overpressure valve 7 for testing. For the test box 8 without diaphragm, the corresponding auxiliary pipe 13 can be closed by closing the overpressure valve 7, and the test box 8 of other auxiliary pipes 13 can be tested normally.

[0040] In the present embodiment, the second pressure relief valve 9 and the third pressure relief valve 10 are arranged on the upstream and downstream sides of the test box 8 respectively for pressure relief. The second pressure relief valve 9 is arranged between the overpressure valve 7 and the test box 8, and the third pressure relief valve 10 is arranged between the test box 8 and the second valve 11. After the test is completed, the excess gas upstream and downstream of the test box 8 is discharged through the second pressure relief valve 9 and the third pressure relief valve 10 to relieve the pressure of the auxiliary pipe 13.

[0041] In the above embodiment, the test box 8, the third pressure relief valve 10, the first pressure gauge 12 and the second valve 11 are connected through a cross connection pipe. Specifically, the cross connection pipe is connected downstream of the test box 8. During the test, the second valve 11 and the third pressure relief valve 10 are closed, and the compressed gas enters the cross connection pipe after passing through the diaphragm to be tested, and the first pressure gauge 12 monitors the pressure downstream of the test box 8.

[0042] In the present embodiment, a liquid storage cavity is arranged in the test box 8 for storing liquid. A clamp is arranged on the liquid storage cavity for fixing the diaphragm to be tested. The diaphragm to be tested is fixed in the test box 8 through the clamp, and the diaphragm to be tested is immersed by injecting liquid into the liquid storage cavity. When the compressed gas passes through the diaphragm to be tested, bubbles will be generated downstream of the diaphragm to be tested, causing the pressure downstream of the test box 8 to change.

[0043] In summary, in the membrane testing device provided in the application, first, the to-be-tested membrane is placed in the testing box 8, the first valve 3 is opened, the second valve 11 is closed, the pressure storage tank 1 is connected to compressed gas for pressurization, when the pressurization reaches the testing pressure, the first valve 3 is closed, the pressure value of the compressed gas passing through the to-be-tested membrane is monitored through the first pressure gauge 12, when the pressure value of the first pressure gauge 12 suddenly changes, the pressure value at this time is the bubble point pressure value of the to-be-tested membrane, the bubble point test of the to-be-tested membrane is realized, the measurement error caused by the visual method is avoided, the accuracy of the membrane test is improved, at the same time, the pressure value of the compressed gas passing through the to-be-tested membrane is monitored through the first pressure gauge 12, the specific bubble point pressure value is obtained, and the diffusion flow test of the membrane can be performed simultaneously according to the pressure value.

[0044] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought of the application should be covered by the claims of the application.

Claims

1. A diaphragm testing device, characterized in that: include: Pressure storage tank, used to introduce compressed gas for pressurization; A test box, used to accommodate the diaphragm to be tested, wherein the test box is connected to the pressure storage tank via a gas pipeline; a first valve, disposed between the pressure storage tank and the test box, the first valve being used to control the opening and closing of the pressure storage tank, and the first valve being located upstream of the test box; a second valve, disposed downstream of the test box, for closing the downstream of the test box; The first pressure gauge is arranged between the test box and the second valve, and is used to monitor the bubble point pressure value passing through the diaphragm to be tested.

2. The diaphragm testing device according to claim 1, characterized in that: The test box is provided with one or more, the gas pipeline includes a main pipeline and one or more auxiliary pipelines, the main pipeline is used to connect the pressure storage tank with each of the auxiliary pipelines, and the auxiliary pipelines are interconnected through the main pipeline, the first valve is provided on the main pipeline, and the test boxes are respectively provided on the corresponding auxiliary pipelines.

3. The diaphragm testing device according to claim 2, characterized in that: The main pipe is provided with a diverter valve for diverting the compressed gas, and the diverter valve is located downstream of the first valve.

4. The diaphragm testing device according to claim 3, characterized in that: The main pipe is further provided with a second pressure gauge for monitoring the pressure value of the compressed gas after passing through the diverter valve, and the second pressure gauge is located downstream of the diverter valve.

5. The diaphragm testing device according to claim 3, characterized in that: The main pipe is further provided with a first pressure relief valve for pressure relief, and the first pressure relief valve is located downstream of the diverter valve.

6. The diaphragm testing device according to claim 2, characterized in that: The secondary pipelines are each provided with an overpressure valve for controlling the opening and closing of the secondary pipelines, and the overpressure valve is located upstream of the test box.

7. The diaphragm testing device according to claim 6, characterized in that: A second pressure relief valve and a third pressure relief valve for pressure relief are respectively provided on both sides of the test box. The second pressure relief valve is provided between the overpressure valve and the test box, and the third pressure relief valve is provided between the test box and the second valve.

8. The diaphragm testing device according to claim 7, characterized in that: The test box, the third pressure relief valve, the first pressure gauge, and the second valve are connected via a cross connecting pipe.

9. The diaphragm testing device according to claim 2, characterized in that: The auxiliary pipelines are arranged in parallel and are communicated with the main pipeline at the same time.

10. The diaphragm testing device according to claim 1, characterized in that: The test box is provided with a liquid storage cavity for storing liquid, and the liquid storage cavity is provided with a clamp for fixing the diaphragm to be tested.

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