A membrane electrode leakage point visualization detection device

Abstract

The present invention provides a visual detection device for membrane electrode leakage points, which includes a visual fixture, a fixture clamping mechanism and a water and gas supply system; the visual fixture includes an air plate and a water plate; both the air plate and the water plate are provided with membrane electrode detection areas, and the membrane electrode is fixedly installed in the membrane electrode detection areas; the fixture clamping mechanism includes a fixed plate, a floating plate, a pressing plate, a handwheel and a trapezoidal lead screw; one side of the fixed plate is provided with a limiting component and the pressing plate; the pressing plate is installed on the fixed plate through a guide shaft, the handwheel is installed at one end of the trapezoidal lead screw, and the other end of the trapezoidal lead screw is connected to the fixed plate; the water and gas supply system includes a pressure vessel, and air and water are contained in the pressure vessel; the pressure vessel is provided with a liquid delivery pipeline and a gas supply pipeline for respectively conveying water and air. The technical solution of the present invention solves the problem that the existing air permeability detection device for membrane electrodes cannot detect the specific position of leakage points.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and more particularly, to a visual detection device for membrane electrode leakage points. Background Art

[0002] Existing membrane electrode detection devices are usually used to detect gas permeability, lacking relevant research on detecting the specific leakage point positions of membrane electrodes. At the same time, existing gas permeability testing devices can only detect large leakage points, and small leakage points cannot be detected or the specific positions of the leakage points cannot be analyzed. Currently, the hydrogen permeation current of the MEA is mainly used to characterize the gas permeability of the MEA. The hydrogen permeation current test is to introduce hydrogen on one side (reference electrode) of the MEA and nitrogen on the other side (working electrode), and use an electrochemical potentiostat scanner to perform a linear potential scan on the working electrode of the MEA to obtain a hydrogen permeation current curve. This method can accurately measure the gas permeability of a small-area MEA. However, when the MEA area is large, it not only has high requirements for the testing instrument, but also is affected by the testing conditions, and the test results are easily deviated from the true values. Summary of the Invention

[0003] In view of the above technical problem that the existing membrane electrode gas permeability detection device cannot detect the specific positions of leakage points, a visual detection device for membrane electrode leakage points is provided. The membrane electrode is fixed within two plates made of plexiglass with flow fields. On one side of the membrane electrode, air regulated by a precision pressure reducing valve is passed to ensure a constant pressure on one side of the membrane electrode. On the other side, liquid water with a constant flow rate is passed. The liquid water is pressurized by compressed air in a pressure vessel to ensure a constant water pressure on the other side of the membrane electrode. Then, the leakage point position of the membrane electrode is determined by observing the bubbles on the surface of the membrane electrode.

[0004] The technical means adopted by the present invention are as follows:

[0005] A visual detection device for membrane electrode leakage points, comprising a visual fixture, a fixture clamping mechanism, and a water and gas supply system;

[0006] The visual fixture includes an air plate and a water plate; both the air plate and the water plate are provided with membrane electrode detection areas. An air flow field is arranged in the membrane electrode detection area of the air plate, and a water flow field is arranged in the membrane electrode detection area of the water plate. The side of the air plate provided with the membrane electrode detection area is oppositely installed with the side of the water plate provided with the membrane electrode detection area. The membrane electrode is fixedly installed within the membrane electrode detection area and is sealed with the air plate and the water plate on both sides respectively; an air inlet channel and an air outlet channel communicated with the air flow field are respectively arranged on both sides of the air plate; a liquid inlet channel and a liquid outlet channel communicated with the water flow field are respectively arranged on both sides of the water plate;

[0007] The fixture clamping mechanism includes a fixed plate, a floating plate, a pressing plate, a handwheel and a trapezoidal lead screw; a limiting component and the pressing plate are arranged on one side of the fixed plate, and the visualization fixture is installed on the fixture clamping mechanism through the limiting component and the pressing plate; the pressing plate is installed on the fixed plate through a guide shaft, the other end of the guide shaft passes through the fixed plate and is fixedly installed on the floating plate, the handwheel is installed at one end of the trapezoidal lead screw, the other end of the trapezoidal lead screw passes through the floating plate and is connected to the fixed plate, and the trapezoidal lead screw nut of the trapezoidal lead screw is fixedly installed on the floating plate;

[0008] The water and gas supply system includes a pressure vessel, in which air and water are contained; an air inlet pipeline and a liquid inlet pipeline are arranged on the end cover of the pressure vessel; the pressure vessel is provided with a liquid supply pipeline and a gas supply pipeline for respectively conveying water and air, the liquid supply pipeline is communicated to the liquid inlet channel of the water plate, the gas supply pipeline is communicated to the air inlet channel of the air plate, a liquid supply on-off valve is arranged on the liquid supply pipeline, and a precision pressure reducing valve and a gas supply on-off valve are arranged on the gas supply pipeline.

[0009] Further, the air pressure on the side of the membrane electrode facing the air plate is slightly higher than the water pressure on the side facing the water plate.

[0010] Further, the water plate further includes an elbow and a liquid outlet pipeline, and the outlet of the liquid inlet channel is connected to the liquid outlet pipeline through the elbow.

[0011] Further, the limiting component includes two left and right guide blocks and a limiting block arranged on the surface of the fixed plate, which are respectively used for limiting the left and right sides and the bottom of the visualization fixture.

[0012] Further, a locking buckle is arranged on the trapezoidal lead screw.

[0013] Further, the air plate and the water plate are respectively provided with four membrane electrode detection areas arranged side by side, and the membrane electrode detection areas of the air plate and the water plate correspond to each other one by one.

[0014] Further, the fixed plate and the pressure vessel are both fixedly installed on a large fixed plate, and a reinforcing rib II is arranged between the bottom of the fixed plate and the large fixed plate; a polyurethane support is arranged at the bottom of the large fixed plate.

[0015] Further, a pressure relief pipeline is further arranged on the end cover of the pressure vessel, and a pressure relief valve is arranged on the pressure relief pipeline. During use, the pressure relief pipeline can be controlled to relieve pressure through the pressure relief valve.

[0016] Further, a pressure gauge communicating with the inside of the pressure vessel is further arranged on the end cover, which is used for monitoring the gas pressure inside the pressure vessel.

[0017] Further, a liquid level pipeline is provided on the side of the pressure vessel, and the upper and lower ends of the liquid level pipeline are respectively connected to the inside of the pressure vessel through a liquid level joint.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The membrane electrode leak point visualization detection device provided by the present invention detects the leak point position of the membrane electrode through a visualization fixture, and uses a handwheel to drive a trapezoidal screw transmission clamping mechanism to clamp the visualization fixture, replacing the traditional screw and nut locking mechanism. It is convenient to operate and has strong compatibility, and can detect multiple samples at the same time, greatly improving the leak point visualization detection efficiency.

[0020] For the above reasons, the present invention can be widely promoted in the field of membrane electrode gas permeability detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic three-dimensional structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0023] Figure 2 It is a schematic three-dimensional structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0024] Figure 3 It is a schematic front structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0025] Figure 4 It is a schematic back structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0026] Figure 5 It is a schematic side plane structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0027] Figure 6 It is a schematic top structure diagram of the membrane electrode leak point visualization detection device described in the present invention.

[0028] Figure 7 It is a schematic structure diagram of the visualization fixture described in the present invention.

[0029] Figure 8 It is a schematic diagram of the water and gas flow direction of the visualization fixture described in the present invention.

[0030] In the figure: 1. Liquid inlet on-off valve; 2. Air inlet on-off valve; 3. Pressure gauge; 4. Pressure relief valve; 5. End cover; 6. Pressure vessel; 7. Liquid level pipeline; 8. Liquid level joint; 9. Fixed large plate; 10. Polyurethane support; 12. Linear bearing; 13. Trapezoidal lead screw nut; 14. Trapezoidal lead screw; 15. Handwheel; 16. Locking buckle; 17. Reinforcing rib I; 18. Floating plate; 19. Guide shaft; 20. Fixed plate; 21. Air plate; 22. Elbow; 23. Liquid outlet pipeline; 24. Pressing plate; 25. Water plate; 26. Guide block; 27. Reinforcing rib II; 28. Limit block; 29. Liquid supply pipeline; 30. Air supply pipeline; 31. Precision pressure reducing valve; 32. Air supply on-off valve; 33. Liquid supply on-off valve; 34. Air inlet pipeline; 35. Liquid inlet pipeline; 36. Pressure relief pipeline; 37, 38, 39, 40: Membrane electrode. Specific implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0036] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc. can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0037] In addition, it should be noted that the use of words such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus cannot be construed as limiting the protection scope of the present invention.

[0038] Embodiment 1

[0039] As shown Figure 1-8 in the figure, the present invention provides a visual detection device for membrane electrode leakage points, which is used for visual analysis of membrane electrodes with unqualified airtightness detection to find out the specific leakage point positions;

[0040] It includes a visual fixture, a fixture clamping mechanism and a water and gas supply system;

[0041] The visual fixture includes an air plate 21 and a water plate 25;

[0042] Both the air plate 21 and the water plate 25 are made of transparent materials;

[0043] Both the air plate 21 and the water plate 25 are provided with membrane electrode detection areas. An air flow field is arranged in the membrane electrode detection area of the air plate 21, and a water flow field is arranged in the membrane electrode detection area of the water plate 25. The side of the air plate 21 where the membrane electrode detection area is located is oppositely installed to the side of the water plate 25 where the membrane electrode detection area is located. The membrane electrode is fixedly installed in the membrane electrode detection area through a positioning pin, and both sides are sealed with the air plate 21 and the water plate 25 through O-rings respectively; the membrane electrode can separate the air plate 21 from the water plate 25, and there are no threaded clearance holes around the two plates. The operation of installing the membrane electrode is simple and the efficiency is high;

[0044] An air inlet channel and an air outlet channel communicating with the air flow field are respectively arranged on both sides of the air plate 21;

[0045] A liquid inlet channel and a liquid outlet channel communicating with the water flow field are respectively arranged on both sides of the water plate 25;

[0046] The fixture clamping mechanism includes a fixed plate 20, a floating plate 18, a pressing plate 24, a handwheel 15 and a trapezoidal lead screw 14;

[0047] A limiting component and the pressing plate 24 are arranged on one side of the fixed plate 20, and the visual fixture is installed on the fixture clamping mechanism through the limiting component and the pressing plate 24;

[0048] The pressing plate 24 is installed on the fixed plate 20 through a guide shaft 19. The guide shaft 19 is connected with the fixed plate 20 through a linear bearing 12. The other end of the guide shaft 19 passes through the fixed plate 20 and is fixedly installed on the floating plate 18. The handwheel 15 is installed at one end of the trapezoidal lead screw 14. The other end of the trapezoidal lead screw 14 passes through the floating plate 18 and is rotatably connected with the fixed plate 20. The trapezoidal lead screw nut 13 of the trapezoidal lead screw 14 is fixedly installed on the floating plate 18;

[0049] The water vapor supply system includes a pressure vessel 6, which contains air and water; an air inlet pipeline 34 and a liquid inlet pipeline 35 are provided on the end cover 5 of the pressure vessel 6, which are respectively used to replenish air and water into the pressure vessel 6, and the air inlet pipeline 34 is provided with an air inlet on-off valve 2, and the liquid inlet pipeline 35 is provided with a liquid inlet on-off valve 1; the pressure vessel 6 is provided with a liquid delivery pipeline 29 and an air supply pipeline 30 for conveying water and air respectively, the liquid delivery pipeline 29 is connected to the liquid inlet channel of the water plate 25, and the air supply pipeline 30 is connected to the air inlet channel of the air plate 21, the liquid delivery pipeline 29 is provided with a liquid delivery on-off valve 33, and the air supply pipeline 30 is provided with a precision pressure reducing valve 31 and an air supply on-off valve 32.

[0050] Furthermore, during the detection process, the on-off of the air supply pipeline 30 is controlled by the air supply on-off valve 32, and the air pressure on the side of the membrane electrode toward the air plate 21 is controlled to be slightly higher than the water pressure on the side toward the water plate 25 by adjusting the precision pressure reducing valve 31 and the liquid supply on-off valve 33, so as to facilitate the passage of air at the leakage point.

[0051] Furthermore, the air plate 21 and the water plate 25 are made of organic glass.

[0052] Furthermore, the water plate 25 further includes an elbow 22 and a liquid outlet pipeline 23 , and the outlet of the liquid outlet channel is connected to the liquid outlet pipeline 23 through the elbow 22 .

[0053] Furthermore, the limiting assembly includes two left and right guide blocks 26 and a limiting block 28 arranged on the surface of the fixing plate, which are respectively used to limit the left and right sides and the bottom of the visualization fixture.

[0054] Furthermore, the trapezoidal lead screw 14 is provided with a locking buckle 16 .

[0055] Furthermore, the floating plate 18 is provided with reinforcing ribs Ⅰ17 to ensure the rigidity and stability of the clamping mechanism of the clamp and prevent deformation.

[0056] Furthermore, the air plate 21 and the water plate 25 are respectively provided with a plurality of membrane electrode detection areas, and the membrane electrode detection areas of the air plate 21 and the water plate 25 correspond one to one, so that the visualization fixture can install a plurality of membrane electrodes at the same time, and the detection device can perform leakage point detection on a plurality of membrane electrodes at the same time, thereby improving the detection efficiency.

[0057] Preferably, the air plate 21 and the water plate 25 are respectively provided with four membrane electrode detection areas arranged side by side, the membrane electrode detection areas of the air plate 21 and the water plate 25 correspond to each other one by one, the visualization fixture can install four membrane electrodes 37 / 38 / 39 / 40, and each membrane electrode is installed side by side.

[0058] Furthermore, both the fixing plate 20 and the pressure vessel 6 are fixedly installed on the large fixing plate 9, and a reinforcing rib II 27 is provided between the bottom of the fixing plate 20 and the large fixing plate 9; a polyurethane support 10 is provided at the bottom of the large fixing plate 9.

[0059] Furthermore, a pressure relief pipeline 36 is also provided on the end cover 5 of the pressure vessel 6, and a pressure relief valve 4 is provided on the pressure relief pipeline 36. During use, the pressure relief pipeline 36 can be controlled to relieve pressure through the pressure relief valve 4.

[0060] Furthermore, a pressure gauge 3 communicating with the inside of the pressure vessel 6 is also provided on the end cover 5, which is used to monitor the gas pressure inside the pressure vessel 6.

[0061] Furthermore, a liquid level pipeline 7 is provided on the side of the pressure vessel 6, which is used to display the liquid level inside the pressure vessel 6, and the upper and lower ends of the liquid level pipeline 7 are respectively connected to the inside of the pressure vessel 6 through a liquid level joint 8.

[0062] When the membrane electrode leakage point visualization detection device provided by the present invention is in use, the membrane electrode is installed on the visualization fixture, and then the visualization fixture as a whole is installed on the fixing plate 20. The positions of the bottom and both sides are defined by the limiting component, and then the handwheel 15 is rotated. The rotation of the trapezoidal lead screw 14 causes the nut 13 to drive the floating plate 18 to perform a linear motion, and then the pressing plate 24 is driven by the guide shaft 19 to completely clamp and fix the visualization fixture on the surface of the fixing plate 20. Then the locking buckle 16 is locked to complete the clamping; the fixture clamping mechanism provided by the present invention is suitable for the detection of most shaped membrane electrodes. As long as the external dimensions of the air plate 21 and the water plate 25 remain unchanged, the same set of clamping mechanisms can be used, with strong applicability, and it solves the problems of cumbersome operation and low efficiency such as the need to assemble screws and bolts around the traditional test fixed visualization fixture.

[0063] During detection, the pressure vessel 6 respectively provides air and water to the air plate 21 and the water plate 25 continuously to ensure that the air and water flow continuously in the air plate 21 and the water plate 25 respectively. The water and air flow directions of the water plate 25 and the air plate 21 are shown in Figure 8 , and the specific position of the leakage point can be determined by observing the bubbles on the surface of the membrane electrode through the transparent air plate 21 and water plate.

[0064] During the detection process, air is conveyed to the air plate 21 by opening the air supply on-off valve 32, and the external air source is controlled to supplement compressed gas into the pressure vessel 6 through the air inlet pipeline 34. The precision pressure reducing valve 31 is adjusted to ensure that the gas pressure remains constant at all times when the liquid level in the pressure vessel 6 drops, so as to ensure that the pressure of the air conveyed to the air plate 21 is constant, ensure that the air side pressure of the membrane electrode is constant, and avoid product damage caused by overpressure. At the same time, the air with a constant pressure in the pressure vessel 6 can also provide power for the supply of liquid water. By opening and adjusting the liquid supply on-off valve 33, the pressure of the water conveyed to the water plate 25 is controlled to be constant, ensuring that the water side pressure of the membrane electrode is constant, no bubbles are generated, and the entire water circuit circulates smoothly. After the detection is completed, the water is discharged through the liquid outlet pipeline 23. The liquid water inside the pressure vessel 6 can be supplemented through the liquid inlet pipeline 35.

[0065] The detection device provided by the present invention is suitable for visual leakage point detection of products with unqualified air permeability in a large number of membrane electrodes produced. It has the characteristics of convenience, speed, and strong practicability. It plays a good role in maintaining the stability of the pressures on both sides of the membrane electrode during the detection process, and can detect multiple samples simultaneously, greatly improving the detection efficiency.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A visual detection device for membrane electrode leakage points, characterized in that It includes a visual fixture, a fixture clamping mechanism and a water and gas supply system; The visualization fixture includes an air plate and a water plate; the air plate and the water plate are both provided with a membrane electrode detection area, the membrane electrode detection area of ​​the air plate is provided with an air flow field, and the membrane electrode detection area of ​​the water plate is provided with a water flow field, the side of the air plate provided with the membrane electrode detection area is installed opposite to the side of the water plate provided with the membrane electrode detection area, the membrane electrode is fixedly installed in the membrane electrode detection area, and the two sides are sealed with the air plate and the water plate respectively; the two sides of the air plate are respectively provided with an air inlet channel and an air outlet channel connected to the air flow field; the two sides of the water plate are respectively provided with a liquid inlet channel and a liquid outlet channel connected to the water flow field; The clamping mechanism of the fixture comprises a fixed plate, a floating plate, a clamping plate, a handwheel and a trapezoidal screw; a limit assembly and the clamping plate are arranged on one side of the fixed plate, and the visualization fixture is installed on the clamping mechanism through the limit assembly and the clamping plate; the clamping plate is installed on the fixed plate through a guide shaft, and the other end of the guide shaft passes through the fixed plate and is fixedly installed on the floating plate, the handwheel is installed on one end of the trapezoidal screw, and the other end of the trapezoidal screw passes through the floating plate and is connected to the fixed plate, and the trapezoidal screw nut of the trapezoidal screw is fixedly installed on the floating plate; The water and gas supply system includes a pressure vessel, which contains air and water; the pressure vessel is provided with a liquid delivery pipeline and an air supply pipeline for conveying water and air respectively, the liquid delivery pipeline is connected to the liquid inlet channel of the water plate, the air supply pipeline is connected to the air inlet channel of the air plate, the liquid delivery pipeline is provided with a liquid delivery on-off valve, and the air supply pipeline is provided with a precision pressure reducing valve and an air supply on-off valve.

2. The membrane electrode leakage point visualization detection device according to claim 1, wherein The air pressure on the side of the membrane electrode facing the air plate is slightly higher than the water pressure on the side facing the water plate.

3. The membrane electrode leakage point visualization detection device according to claim 1, wherein The water plate further comprises an elbow and a liquid outlet pipeline, and the outlet of the liquid outlet channel is connected to the liquid outlet pipeline through the elbow.

4. The membrane electrode leakage point visualization detection device according to claim 1, characterized in that The limiting assembly includes two left and right guide blocks and a limiting block arranged on the surface of the fixing plate, which are respectively used to limit the left and right sides and the bottom of the visualization fixture.

5. The membrane electrode leakage point visualization detection device according to claim 1, wherein, The trapezoidal lead screw is provided with a locking buckle.

6. The membrane electrode leakage point visualization detection device according to claim 1, wherein The air plate and the water plate are respectively provided with four membrane electrode detection areas arranged side by side, and the membrane electrode detection areas of the air plate and the water plate correspond to each other one by one.

7. The membrane electrode leakage point visualization detection device according to claim 1, characterized in that The fixed plate and the pressure vessel are both fixedly mounted on the fixed large plate, and a reinforcing rib II is arranged between the bottom of the fixed plate and the fixed large plate; a polyurethane support is arranged at the bottom of the fixed large plate.

8. The membrane electrode leakage point visualization detection device according to claim 1, characterized in that The end cover of the pressure vessel is also provided with a pressure relief pipeline, and the pressure relief pipeline is provided with a pressure relief valve. When in use, the pressure relief pipeline can be controlled by the pressure relief valve to release pressure.

9. The membrane electrode leakage point visualization detection device according to claim 8, characterized in that, The end cover is also provided with a pressure gauge which is in communication with the interior of the pressure container.

10. The membrane electrode leakage point visualization detection device according to claim 1, characterized in that, A liquid level pipeline is arranged on the side of the pressure container, and the upper and lower ends of the liquid level pipeline are respectively connected to the interior of the pressure container through a liquid level joint.

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