A membrane electrode permeation detection device

Abstract

The present invention relates to the technical field of detection equipment, and discloses a membrane electrode permeation detection device, including a hydrogen gas supply device, an inactive gas gas supply device, a first detection box and a second detection box, wherein the first detection box is connected to the inactive gas gas supply device through a first gas supply pipe, the first detection box is connected to the hydrogen gas supply device through a hydrogen supply pipe, a first pressure gauge is provided on the first detection box, and the first detection box is respectively connected to a first exhaust pipe and a pressure-stabilizing overflow pipe provided with a pressure-stabilizing overflow valve; the second detection box is connected to the inactive gas gas supply device through a second gas supply pipe, the second detection box is provided with a second pressure gauge and a hydrogen concentration detector, and the second detection box is connected to a second exhaust pipe; both the first exhaust pipe and the second exhaust pipe are provided with exhaust valves; and the membrane electrode is clamped between the first detection box and the second detection box. The present invention can ensure the stability of gas permeation and leakage conditions, can accurately obtain the permeability of the membrane electrode, and more accurately judge the leakage of the membrane electrode.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, and in particular to a membrane electrode penetration detection device. Background Art

[0002] The existing membrane electrode detection device is designed to detect the air tightness of the membrane electrode of the fuel cell, mainly to detect whether there is a leak in the fuel cell. The main detection medium is air. It can only determine whether the membrane electrode is leaking by observing the changes in gas flow and pressure difference. It is a simple leak detection device.

[0003] Hydrogen has a stronger permeability than air. Using air as a detection medium cannot accurately detect leakage (including whether there is leakage and how fast the leakage is detected). A single sample needs to be tested for a long time to determine whether the membrane electrode is leaking. When hydrogen is used as a detection medium, due to the high permeability of hydrogen, when the hydrogen alarm device sounds an alarm, it is often not 100% sure whether the membrane electrode is leaking or hydrogen has just permeated the membrane electrode normally. In addition, due to the change in air pressure in the test chamber during the test, the gas permeability and test results will also be affected by the change in air pressure, resulting in inaccurate test results. Traditional detection devices can only be used to determine whether there is leakage in the membrane electrode, and cannot accurately determine the amount of leakage and cannot be applied to hydrogen permeability research of other materials. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a membrane electrode permeation detection device to ensure the stability of gas permeation and leakage conditions. Through the accurate hydrogen concentration of the second detection box, the permeability of the membrane electrode can be accurately known, and the leakage of the membrane electrode can be judged more accurately.

[0005] In order to solve the above technical problems, the present invention provides a membrane electrode permeation detection device, including a hydrogen supply device, an inactive gas supply device, a first detection box and a second detection box, the first detection box is connected to the inactive gas supply device through a first gas supply pipe, the first detection box is connected to the hydrogen supply device through a hydrogen supply pipe, the first detection box is provided with a first pressure gauge for detecting the inner cavity pressure thereof, the first detection box is respectively connected to a first exhaust pipe and a pressure-stabilizing overflow pipe, and the pressure-stabilizing overflow pipe is provided with a pressure-stabilizing overflow valve; the second detection box is connected to the inactive gas supply device through a second gas supply pipe, the second detection box is provided with a second pressure gauge for detecting the inner cavity pressure thereof and a hydrogen concentration detector for detecting the hydrogen concentration of the inner cavity thereof, and the second detection box is connected to a second exhaust pipe; the first exhaust pipe and the second exhaust pipe are both provided with exhaust valves; the membrane electrode is clamped between a first vent on the first detection box and a second vent on the second detection box.

[0006] As a preferred solution of the present invention, the inert gas supply device is a nitrogen gas supply device.

[0007] As a preferred solution of the present invention, it also includes a three-position four-way reversing valve, the output end of the hydrogen supply device is connected to the P port of the three-position four-way reversing valve, the output end of the inactive gas supply device is connected to the B port of the three-position four-way reversing valve, the T port of the three-position four-way reversing valve is connected to the hydrogen supply pipe, and the A port of the three-position four-way reversing valve is respectively connected to the first gas supply pipe and the second gas supply pipe through the gas supply main pipe; when the hydrogen supply device supplies hydrogen, the P port of the three-position four-way reversing valve is connected to the T port of the three-position four-way reversing valve; when the inactive gas supply device supplies gas, the B port of the three-position four-way reversing valve is respectively connected to the A port and the T port of the three-position four-way reversing valve.

[0008] As a preferred solution of the present invention, a flow meter is provided on the hydrogen supply pipe.

[0009] As a preferred solution of the present invention, the output end of the hydrogen gas supply device is connected to a one-way valve; the output end of the inactive gas gas supply device is connected to a one-way valve.

[0010] As a preferred solution of the present invention, both the first air supply pipe and the second air supply pipe are provided with throttle valves.

[0011] As a preferred solution of the present invention, a one-way valve is provided on the pressure-stabilizing overflow pipe.

[0012] As a preferred solution of the present invention, both the first exhaust pipe and the second exhaust pipe are provided with a one-way valve, and the exhaust valve is a throttle valve.

[0013] As a preferred solution of the present invention, an outer frame is provided on the periphery of the membrane electrode, a first sealing ring arranged around the outer periphery of the first air vent is provided on the first detection box, and the first detection box is sealed with the outer frame through the first sealing ring, and the second detection box is provided with a second sealing ring arranged around the outer periphery of the second air vent, and the second detection box is sealed with the outer frame through the second sealing ring.

[0014] Compared with the prior art, the membrane electrode permeation detection device implemented by the present invention has the following beneficial effects:

[0015] When the present invention is working, the inactive gas supply device is first opened to introduce inactive gas into the first detection box and the second detection box through the first gas supply pipe and the second gas supply pipe respectively, and the gas in the first detection box and the second detection box is completely replaced, so as to ensure accurate detection and avoid the danger of subsequent introduction of hydrogen. At the same time, the exhaust valves on the first exhaust pipe and the second exhaust pipe are opened. After the gas replacement is completed, the exhaust valves on the first exhaust pipe and the second exhaust pipe are closed and the inactive gas supply device is suspended at the same time; the gas pressure in the cavity of the detection box on both sides of the membrane electrode is stabilized to ensure the stability of the gas permeation conditions, and it can be used to simulate the gas pressure environment of the membrane electrode in the fuel cell stack;

[0016] Then, the hydrogen supply device is turned on to introduce hydrogen into the first detection box through the hydrogen supply pipe and completely replace the inactive gas in the first detection box, and the gas is discharged through the pressure-stabilizing overflow pipe to complete the gas replacement;

[0017] Secondly, the air pressure in the first detection box and the second detection box is obtained in real time according to the first pressure gauge and the second pressure gauge. When the membrane electrode has poor air tightness, the hydrogen in the first detection box enters the second detection box through the membrane electrode, resulting in a pressure difference between the first detection box and the second detection box. By adjusting the amount of hydrogen introduced into the first detection box, the excess hydrogen is discharged through the pressure-stabilizing overflow valve, thereby maintaining an isobaric state between the first detection box and the second detection box, ensuring the stability of gas permeation and leakage conditions, and making the detection data more accurate.

[0018] Finally, the hydrogen concentration and detection time detected by the hydrogen concentration detector on the second detection box can accurately determine the permeability of the membrane electrode; by monitoring the speed of hydrogen permeating through the membrane electrode, the leakage of the membrane electrode can be more accurately determined, replacing the previous hydrogen alarm that can only vaguely determine whether a leak has occurred. This device can not only be used for hydrogen permeability research and leakage judgment of fuel cells, but also for hydrogen permeability research and analysis of other thin film materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] Figure 1 It is a structural schematic diagram of a membrane electrode permeation detection device provided by the present invention;

[0021] In the figure, 1 is a hydrogen supply device; 11 is a hydrogen supply pipe; 12 is a flow meter; 2 is an inactive gas supply device; 21 is a first supply pipe; 22 is a second supply pipe; 3 is a first detection box; 31 is a first pressure gauge; 32 is a first exhaust pipe; 33 is a pressure-stabilizing overflow pipe; 34 is a pressure-stabilizing overflow valve; 35 is a first sealing ring; 4 is a second detection box; 41 is a second pressure gauge; 42 is a hydrogen concentration detector; 43 is a second exhaust pipe; 44 is a second sealing ring; 5 is a membrane electrode; 6 is a three-position four-way reversing valve; 7 is a one-way valve; and 8 is a throttle valve. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0024] like Figure 1 As shown, a membrane electrode permeation detection device according to a preferred embodiment of the present invention comprises a hydrogen supply device 1, an inactive gas supply device 2, a first detection box 3 and a second detection box 4, wherein the first detection box 3 is connected to the inactive gas supply device 2 via a first gas supply pipe 21, the first detection box 3 is connected to the hydrogen supply device 1 via a hydrogen supply pipe 11, the first detection box 3 is provided with a first pressure gauge 31 for detecting the inner cavity pressure thereof, the first detection box 3 is respectively connected to a first exhaust pipe 32 and a pressure stabilizing overflow pipe 33, the first pressure stabilizing overflow pipe 33 and the first exhaust pipe 32 are connected to the first exhaust pipe 32 and the first exhaust pipe 3 ... A pressure-stabilizing overflow valve 34 is provided on the pressure overflow pipe 33; the second detection box 4 is connected to the inactive gas supply device 2 through the second gas supply pipe 22, the second detection box 4 is provided with a second pressure gauge 41 for detecting the inner cavity pressure and a hydrogen concentration detector 42 for detecting the inner cavity hydrogen concentration, and the second detection box 4 is connected to a second exhaust pipe 43; the first exhaust pipe 32 and the second exhaust pipe 43 are both provided with exhaust valves; the membrane electrode 5 is clamped between the first air vent on the first detection box 3 and the second air vent on the second detection box 4.

[0025] The working process of the present invention is as follows: first, the inert gas supply device 2 is turned on to introduce inert gas into the first detection box 3 and the second detection box 4 through the first gas supply pipe 21 and the second gas supply pipe 22 respectively, and the gas in the first detection box 3 and the second detection box 4 is completely replaced, so as to ensure accurate detection and avoid the danger of subsequent introduction of hydrogen. At the same time, the exhaust valves on the first exhaust pipe 32 and the second exhaust pipe 43 are opened. After the gas replacement is completed, the exhaust valves on the first exhaust pipe 32 and the second exhaust pipe 43 are closed and the inert gas supply device 2 is suspended; the gas pressure in the cavity of the detection box on both sides of the membrane electrode 5 is stabilized to ensure the stability of the gas permeation conditions, and it can be used to simulate the gas pressure environment of the membrane electrode 5 in the fuel cell stack;

[0026] Then, the hydrogen supply device 1 is turned on to introduce hydrogen into the first detection box 3 through the hydrogen supply pipe 11 and completely replace the inactive gas in the first detection box 3, and the gas is discharged through the pressure-stabilizing overflow pipe 33 to complete the gas replacement;

[0027] Secondly, the air pressure in the first detection box 3 and the second detection box 4 is obtained in real time according to the first pressure gauge 31 and the second pressure gauge 41. When the membrane electrode 5 has poor air tightness, the hydrogen in the first detection box 3 enters the second detection box 4 through the membrane electrode 5, resulting in a pressure difference between the first detection box 3 and the second detection box 4. By adjusting the amount of hydrogen introduced into the first detection box 3, the excess hydrogen is discharged through the pressure-stabilizing relief valve 34 (to avoid excessive air pressure in the first detection box 3), so that the first detection box 3 and the second detection box 4 are kept in an isobaric state, ensuring the stability of gas permeation and leakage conditions, and making the detection data more accurate.

[0028] Finally, the hydrogen concentration and detection time detected by the hydrogen concentration detector 42 on the second detection box 4 can accurately know the permeability of the membrane electrode 5; by monitoring the speed of hydrogen permeating through the membrane electrode 5, the leakage of the membrane electrode 5 can be more accurately judged, replacing the previous hydrogen alarm that can only vaguely judge whether a leak has occurred. This device can not only be used for hydrogen permeability research and leakage judgment of fuel cells, but also for hydrogen permeability research and analysis of other thin film materials.

[0029] Preferably, the hydrogen concentration detector 42 is a high-precision hydrogen concentration detector 42, which has high detection sensitivity and can accurately detect the increase of hydrogen concentration. At the same time, PPM is used as a metric standard. By associating the test time with the test data, the hydrogen permeation rate is accurately reflected, and whether the membrane electrode 5 is leaking is determined based on the permeation rate; when hydrogen permeation occurs, the high-precision concentration measurement equipment can respond within 0.1 seconds and update the test data in real time at a speed of 1 Hz to ensure data continuity.

[0030] Exemplarily, the inactive gas supply device 2 is a nitrogen supply device. Nitrogen is very inactive in chemical properties, which prevents hydrogen and nitrogen from reacting at room temperature. In addition, nitrogen is the main component of air, and the discharge of nitrogen into the atmosphere will not pollute the environment.

[0031] Exemplarily, the membrane electrode permeation detection device also includes a three-position four-way reversing valve 6, the output end of the hydrogen supply device 1 is connected to the P port of the three-position four-way reversing valve 6, the output end of the inactive gas supply device 2 is connected to the B port of the three-position four-way reversing valve 6, the T port of the three-position four-way reversing valve 6 is connected to the hydrogen supply pipe 11, and the A port of the three-position four-way reversing valve 6 is respectively connected to the first gas supply pipe 21 and the second gas supply pipe 22 through the gas supply main pipe; when the hydrogen supply device 1 supplies hydrogen, the P port of the three-position four-way reversing valve 6 is connected to the T port of the three-position four-way reversing valve 6; when the inactive gas supply device 2 supplies gas, the B port of the three-position four-way reversing valve 6 is respectively connected to the A port and the T port of the three-position four-way reversing valve 6. In this way, the gas supply to the first detection box 3 and the second detection box 4 is adjusted by the three-position four-way reversing valve 6, and when the B port of the three-position four-way reversing valve 6 is respectively connected to the A port and the T port of the three-position four-way reversing valve 6 (the B port is not connected to the P port), the inactive gas supply device 2 can pass the inactive gas to the first detection box 3 through the hydrogen supply pipe 11 and the first gas supply pipe 21, and pass the inactive gas to the second detection box 4 through the second gas supply pipe 22, so as to replace the gas (air) in the first detection box 3 and the second detection box 4, and can quickly replace the gas in the first detection box 3 to ensure the safety of the subsequent introduction of hydrogen; when the P port of the three-position four-way reversing valve 6 is connected to the T port of the three-position four-way reversing valve 6 (the B port is not connected to the A port), the hydrogen supply device 1 can pass the hydrogen to the first detection box 3 through the hydrogen supply pipe 11; preferably, a valve is provided at the end of the first gas supply pipe 21.

[0032] Exemplarily, a flow meter 12 is provided on the hydrogen supply pipe 11, and the hydrogen inlet flow of the hydrogen supply pipe 11 is controlled by adjusting the hydrogen supply amount of the hydrogen supply device 1, so that the first detection box 3 and the second detection box 4 are in an isobaric state. At the same time, the real-time flow rate of hydrogen can be accurately known through the flow meter 12, so as to avoid the hydrogen supply amount of the hydrogen supply device 1 being too small, resulting in too low gas pressure in the first detection box 3.

[0033] Exemplarily, the output end of the hydrogen supply device 1 is connected to a one-way valve 7; the output end of the inactive gas supply device 2 is connected to a one-way valve 7, which effectively avoids the backflow of gas when the gas supply is suspended.

[0034] Exemplarily, the first air supply pipe 21 and the second air supply pipe 22 are both provided with a throttle valve 8, and the opening of the throttle valve 8 can be adjusted according to the actual situation to adjust the flow rate of the air supply.

[0035] Exemplarily, a one-way valve 7 is provided on the pressure-stabilizing overflow pipe 33 to prevent gas backflow from affecting the detection result.

[0036] Exemplarily, both the first exhaust pipe 32 and the second exhaust pipe 43 are provided with a one-way valve 7 to ensure one-way discharge of gas, and the exhaust valve is a throttle valve 8 to facilitate adjustment of the exhaust flow rate of the first exhaust pipe 32 and the second exhaust pipe 43.

[0037] Exemplarily, the membrane electrode 5 is provided with an outer frame on its periphery, the first detection box 3 is provided with a first sealing ring 35 arranged around the periphery of the first vent, the first detection box 3 is sealed with the outer frame through the first sealing ring 35, the second detection box 4 is provided with a second sealing ring 44 arranged around the periphery of the second vent, the second detection box 4 is sealed with the outer frame through the second sealing ring 44, the sealing between the first detection box 3, the second detection box 4 and the membrane electrode 5 is ensured, and the accuracy of the detection result is ensured. Preferably, the first sealing ring 35 and the second sealing ring 44 are both made of elastic material.

[0038] Exemplarily, the end of the pressure-stabilizing overflow pipe 33 is connected to a processing device for processing gas, so as to facilitate the processing or recovery of hydrogen and avoid direct discharge of hydrogen into the atmosphere.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A membrane electrode permeation detection device, characterized in that: The invention comprises a hydrogen gas supply device, an inactive gas gas supply device, a first detection box and a second detection box, wherein the first detection box is connected to the inactive gas gas supply device through a first gas supply pipe, the first detection box is connected to the hydrogen gas supply device through a hydrogen supply pipe, a first pressure gauge for detecting the pressure of its inner cavity is provided on the first detection box, the first detection box is respectively connected to a first exhaust pipe and a pressure-stabilizing overflow pipe, the pressure-stabilizing overflow pipe is provided with a pressure-stabilizing overflow valve, and a processing device for processing gas is connected to the end of the pressure-stabilizing overflow pipe; the second detection box is connected to the inactive gas gas supply device through a second gas supply pipe, the output end of the hydrogen gas supply device is connected to the P port of the three-position four-way reversing valve, the output end of the inactive gas gas supply device is connected to the B port of the three-position four-way reversing valve, the T port of the three-position four-way reversing valve is connected to the hydrogen supply pipe, and the A port of the three-position four-way reversing valve is connected to the gas supply main pipe The first gas supply pipe is connected with the second gas supply pipe respectively; when the hydrogen supply device supplies hydrogen, the P port of the three-position four-way reversing valve is connected with the T port of the three-position four-way reversing valve; when the inactive gas supply device supplies gas, the B port of the three-position four-way reversing valve is connected with the A port and the T port of the three-position four-way reversing valve respectively, the second detection box is provided with a second pressure gauge for detecting the pressure of its inner cavity and a hydrogen concentration detector for detecting the hydrogen concentration of its inner cavity, and the second detection box is connected with a second exhaust pipe; the first exhaust pipe and the second exhaust pipe are both provided with exhaust valves; the membrane electrode is clamped between the first vent on the first detection box and the second vent on the second detection box; the hydrogen supply device is opened to introduce hydrogen into the first detection box through the hydrogen supply pipe and completely replace the inactive gas in the first detection box, and the gas is discharged through the pressure-stabilizing overflow pipe to complete the gas replacement.

2. The membrane electrode permeation detection device according to claim 1, characterized in that: The inactive gas supply device is a nitrogen gas supply device.

3. The membrane electrode permeation detection device according to claim 1, characterized in that: A flow meter is arranged on the hydrogen supply pipe.

4. The membrane electrode permeation detection device according to claim 1, characterized in that: The output end of the hydrogen supply device is connected to a one-way valve; the output end of the inactive gas supply device is connected to a one-way valve.

5. The membrane electrode permeation detection device according to claim 1, characterized in that: The first air supply pipe and the second air supply pipe are both provided with throttle valves.

6. The membrane electrode permeation detection device according to claim 1, characterized in that: A one-way valve is arranged on the pressure-stabilizing overflow pipe.

7. The membrane electrode permeation detection device according to claim 1, characterized in that: The first exhaust pipe and the second exhaust pipe are both provided with a one-way valve, and the exhaust valve is a throttle valve.

8. The membrane electrode permeation detection device according to claim 1, characterized in that: An outer frame is provided on the periphery of the membrane electrode, a first sealing ring arranged around the outer periphery of the first vent is provided on the first detection box, and the first detection box is sealed with the outer frame through the first sealing ring, and a second sealing ring is provided on the second detection box, and the second detection box is sealed with the outer frame through the second sealing ring.

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