Short pile air tightness detection workbench applied to membrane electrode test

Abstract

The utility model relates to the technical field of fuel cells, in particular to a short stack airtightness detection workbench applied to membrane electrode testing, which comprises a rack, an assembling area and a testing area are arranged on the rack, the assembling area is an area for assembling a short stack to be tested, the testing area is an area for placing the short stack to be tested during airtightness testing, and the testing area is an area for placing the short stack to be tested. A storage area and an underwater test area are respectively arranged below the assembly area and the test area, the storage area is an area for placing articles, the underwater test area is an area for observing the leakage position of a to-be-tested short pile, a tool storage plate and a gas circuit control area are respectively arranged in front of the assembly area and the test area, the tool storage plate is used for placing tools used for assembly, and the gas circuit control area is used for controlling the gas circuit control area. The gas circuit control area is used for connecting a gas source and a to-be-tested short reactor; compared with the prior art, the whole process of assembling / testing can be completed, the structure is compact, the functional blocks are complete, the complex operation process can be simplified, and potential safety hazards in the carrying process can be avoided.

Description

[Technical field]

[0001] The utility model relates to the technical field of fuel cells, in particular to a short stack air tightness detection workbench used for membrane electrode testing. [Background Technology]

[0002] The hydrogen energy industry is developing vigorously. The most critical component in its fuel cell system is the stack. The core part of the stack is the membrane electrode. Currently, the second-generation membrane electrode is the mainstream, using catalyst-coated membrane technology to prepare the catalyst layer on the proton membrane. The membrane electrode performance test is particularly important. The carrier of the performance test is the fuel cell test short stack. Before the membrane electrode test, it is necessary to ensure the sealing and pressure-maintaining capacity of the test short stack. However, the sealing of the test short stack is relatively complicated during the test process. The main reasons are:

[0003] (1) Each test short stack has three channels. Not only does it need to test the sealing of each channel separately, but it also needs to test the sealing between every two channels. As a result, each test requires the pipeline to be re-inserted before the next test, which makes the operation process complicated and time-consuming;

[0004] (2) The assembled short stack needs to be transported from the assembly table to the test table. If a leak occurs, it is necessary to observe the leak point in the test pool. This process wastes manpower and material resources, and there are safety hazards during the transportation process.

[0005] (3) During use, the test water tank is usually placed on a cart and filled and drained manually. After the water is sufficient, it is transported to the test bench for testing. The operation is complicated and there are safety hazards.

[0006] Therefore, the industry lacks a test bench that is compatible with testing short stack assembly, testing and leakage point observation. [Contents of the utility model]

[0007] The purpose of the utility model is to solve the above-mentioned shortcomings and provide a workbench for air tightness detection of short stacks used for membrane electrode testing, which can complete the whole process of assembly / testing, has a compact structure and complete functional blocks, and can not only simplify the complicated operation process, but also avoid potential safety hazards during transportation.

[0008] In order to achieve the above-mentioned purpose, a workbench for air tightness detection of short stacks for membrane electrode testing is designed, comprising a stand 2, on which an assembly area 201 and a test area 203 are provided, wherein the assembly area 201 is an area for assembling the short stack to be tested, and the test area 203 is an area for placing the short stack to be tested during the air tightness test, and a storage area 202 and an underwater test area 204 are respectively provided below the assembly area 201 and the test area 203, wherein the storage area 202 is an area for placing items, and the underwater test area 204 is an area for observing the leakage position of the short stack to be tested, and a tool summary plate 1 and a gas path control area 9 are respectively provided in front of the assembly area 201 and the test area 203, wherein the tool summary plate 1 is used for placing tools used for assembly, and the gas path control area 9 is used for connecting the gas source and the short stack to be tested.

[0009] Furthermore, a water inlet valve 8 is provided between the tool summary plate 1 and the air path control area 9, and the water inlet valve 8 is used to connect the water inlet pipe and the water tank and control the water source to enter.

[0010] Furthermore, an electric control box 3 is provided at the bottom of the test bench 2. The electric control box 3 is a box in which the power supply of the equipment is placed. A foot 4 is installed at the bottom of the test bench 2, and the flatness of the test bench is adjusted by the foot 4. An explosion-proof lamp 6 is installed on the top of the test bench 2.

[0011] Furthermore, a movable door 10 is provided at the test area 203 , and a handle 11 is installed on the movable door 10 , and the handle 11 is used to move the movable door 10 away when underwater testing is required.

[0012] Furthermore, the underwater test area 204 is provided with a water tank 13, and the water tank 13 is made of a transparent material to facilitate observation of the test status in the water tank. A drain valve 14 is installed under the water tank 13, and the drain valve 14 is used to drain water after the test is completed.

[0013] Furthermore, a circular track 5 is installed on the top of the test stand 2, and a spring balancer 7 is slidably connected to the circular track 5. The spring balancer 7 is used to assist the tester in moving the short pile to be tested.

[0014] Further, a hydrogen inlet 1601, an air inlet 1602 and a water inlet 1603 are provided on one side of the short pile to be tested, the hydrogen inlet 1601 is the inlet for introducing hydrogen into the short pile to be tested, the air inlet 1602 is the inlet for introducing air into the short pile to be tested, the water inlet 1603 is the inlet for introducing water into the short pile to be tested, a hook 1604 is installed in the middle of the short pile to be tested, and the hook 1604 is used in conjunction with the spring balancer 7, and a water outlet 1605, an air outlet 1606 and a hydrogen outlet 1607 are provided on the other side of the short pile to be tested, the water outlet 1605 is the outlet for water to flow out of the short pile to be tested, the air outlet 1606 is the outlet for air to flow out of the short pile to be tested, and the hydrogen outlet 1607 is the outlet for hydrogen to flow out of the short pile to be tested.

[0015] Furthermore, the underwater test area 204 is provided with a lifting and rotating platform 15, and the lifting and rotating platform 15 is used to transport the short pile to be tested to the test position. The lifting and rotating platform 15 includes a rotating tray 1501, a sealing component 1502, a lifter 1503, a sealing component 2 1504 and a control box 1505. The top of the lifter 1503 is connected to the rotating tray 1501 through the sealing component 1502. The bottom surface of the rotating tray 1501 is in an inverted cone shape and has a mesh structure. The bottom end of the lifter 1503 is connected to the control box 1505 through the sealing component 2 1504. The control box 1505 is electrically connected to the rotating tray 1501 and the lifter 1503, respectively, and controls their rotation and lifting, respectively.

[0016] Furthermore, a controller 12 is installed on one side of the platform 2. The controller 12 is electrically connected to the lifting and rotating platform 15, and controls the lifting and rotating platform 15 to rise, fall, rotate forward, reverse, start or stop.

[0017] Furthermore, the gas path control area 9 includes a fixing plate 905, an air pipe channel fixed on the fixing plate 905, and a cover plate 904 for protecting the air pipe channel. The fixing plate 905 is fixedly connected to the stand 2. A pressure regulating valve 901 is installed at the air inlet of the air pipe channel. The pressure regulating valve 901 is used to control the air inlet pressure. A ball valve switch 7 912 is installed at the exhaust port of the air pipe channel. The ball valve switch 7 912 is used by the user to discharge unnecessary gas. The air pipe channel is installed with a precision pressure reducing valve 902, a ball valve switch 1 903, a ball valve switch 2 906, a ball valve switch 3 907, a ball valve switch 4 908, a ball valve switch 5 909, and a ball valve switch 6 910. and flow meter 911, the precision pressure reducing valve 902 is used to accurately reduce the pressure to the test pressure, the ball valve switch 1 903 is arranged between the pressure regulating valve 901 and the precision pressure reducing valve 902, and controls the gas flow between the pressure regulating valve 901 and the precision pressure reducing valve 902, the ball valve switch 2 906, the ball valve switch 3 907, and the ball valve switch 4 908 respectively control the output of one gas, the ball valve switch 5 909 is connected in series with the flow meter 911 and then connected to the ball valve switch 2 906, the ball valve switch 3 907 and the ball valve switch 4 908, the ball valve switch 6 910 is connected in parallel with the flow meter 911 and then connected to the ball valve switch 2 906, the ball valve switch 3 907 and the ball valve switch 4 908.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] (1) The utility model is used for testing the air tightness test bench of a short stack for membrane electrode testing, which integrates testing and assembly into one, saves space, and effectively avoids the risk of falling during transportation;

[0020] (2) The utility model is equipped with tool placement and material placement areas, and only requires one testing workbench to complete the entire assembly / testing process. It has a compact structure, complete functional blocks, and low cost;

[0021] (3) The unique gas circuit design of the utility model effectively avoids the cumbersome pipeline connection during the test process. The switch directly controls the change of the gas circuit to complete the test, saving time and manpower;

[0022] (4) The utility model can efficiently complete the test of the air tightness of the short pile for testing, and only one female tester is required to complete the whole set of assembly test work, thus overcoming the defects of the traditional test that requires at least one male tester and the addition of auxiliary tools to complete the test;

[0023] In summary, the utility model is a test bench that can store tools, assemble short piles, test air tightness, and observe leakage points. At the same time, the test bench can connect the air pipe at one time, and it is easy to charge and discharge water, assist in the movement of short piles, and automatically control the entry of short piles into water. It can not only simplify the complicated operation process, but also avoid safety hazards during transportation. After assembly, it only needs to be moved directly to the detection area using a balancer to connect the pipeline for testing. At the same time, the utility model covers a storage table, and the short pile can be placed on the storage table after testing. [Drawings]

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 This is a schematic diagram of the gas circuit control of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the short pile to be tested in the utility model;

[0027] Figure 4 This is a schematic diagram of the front structure of the utility model Figure 1 (Lifting and rotating table);

[0028] Figure 5 This is a schematic diagram of the front structure of the utility model Figure 2 (The highest and lowest positions of the lifting and rotating table);

[0029] In the figure: 1, tool summary board 2, stand 3, control box 4, anchor 5, circular track 6, explosion-proof lamp 7, spring balancer 8, water inlet valve 9, air circuit control area 10, movable door 11, handle 12, controller 13, water tank 14, drain valve 15, lifting and rotating table 201, assembly area 202, storage area 203, test area 204, underwater test area 901, pressure regulating valve 902, precision pressure reducing valve 903, ball valve switch 904, cover plate 905, fixing plate 906, Ball valve switch two 907, ball valve switch three 908, ball valve switch four 909, ball valve switch five 910, ball valve switch six 911, flow meter 912, ball valve switch seven 1501, rotating tray 1502, sealing component one 1503, lifter 1504, sealing component two 1505, control box 1601, hydrogen inlet 1602, air inlet 1603, water inlet 1604, hook 1605, water outlet 1606, air outlet 1607, hydrogen outlet. [Specific implementation method]

[0030] The utility model is further described below in conjunction with the accompanying drawings:

[0031] As attached Figure 1 To Attachment Figure 5 As shown, the utility model provides a workbench for air tightness detection of short stacks for membrane electrode testing, including a stand 2, on which an assembly area 201 and a test area 203 are provided, the assembly area 201 is an area for assembling the short stack to be tested, the test area 203 is an area for placing the short stack to be tested during the air tightness test, a storage area 202 and an underwater test area 204 are respectively provided below the assembly area 201 and the test area 203, the storage area 202 is an area for placing items, the underwater test area 204 is an area for observing the leakage position of the short stack to be tested, a tool summary plate 1 and a gas path control area 9 are respectively provided in front of the assembly area 201 and the test area 203, the tool summary plate 1 is used to place the tools used for assembly, and the gas path control area 9 is used to connect the gas source and the short stack to be tested.

[0032] A water inlet valve 8 is provided between the tool summary board 1 and the air circuit control area 9. The water inlet valve 8 is used to connect the water inlet pipe and the water tank and control the water source to enter. A circular track 5 is installed on the top of the bench 2. A spring balancer 7 is slidably connected to the circular track 5. The spring balancer 7 is used to assist the tester in moving the short pile to be tested; an electric control box 3 is provided at the bottom of the bench 2. The electric control box 3 is a box for placing the power supply of the equipment. A foot 4 is installed at the bottom of the bench 2, and the flatness of the test bench is adjusted by the foot 4. An explosion-proof lamp 6 is installed on the top of the bench 2. A movable door 10 is provided at the test area 203. A handle 11 is installed on the movable door 10. The handle 11 is used to move the movable door 10 away when underwater testing is required. A water tank 13 is provided in the underwater test area 204. The water tank 13 is made of transparent material to facilitate observation of the test status in the water tank. A drain valve 14 is installed below the water tank 13. The drain valve 14 is used to drain water after the test is completed.

[0033] A hydrogen inlet 1601, an air inlet 1602 and a water inlet 1603 are provided on one side of the short pile to be tested. The hydrogen inlet 1601 is the inlet for introducing hydrogen into the short pile to be tested, the air inlet 1602 is the inlet for introducing air into the short pile to be tested, and the water inlet 1603 is the inlet for introducing water into the short pile to be tested. A hook 1604 is installed in the middle of the short pile to be tested, and the hook 1604 is used in conjunction with the spring balancer 7. A water outlet 1605, an air outlet 1606 and a hydrogen outlet 1607 are provided on the other side of the short pile to be tested. The water outlet 1605 is the outlet for water to flow out of the short pile to be tested, the air outlet 1606 is the outlet for air to flow out of the short pile to be tested, and the hydrogen outlet 1607 is the outlet for hydrogen to flow out of the short pile to be tested.

[0034] The underwater test area 204 is provided with a lifting and rotating platform 15, which is used to transport the short pile to be tested to the test position. The lifting and rotating platform 15 includes a rotating tray 1501, a sealing component 1502, a lifter 1503, a sealing component 2 1504 and a control box 1505. The top of the lifter 1503 is connected to the rotating tray 1501 through the sealing component 1502. The bottom surface of the rotating tray 1501 is in an inverted cone shape and has a mesh structure. The bottom of the lifter 1503 is connected to the control box 1505 through the sealing component 2 1504. The control box 1505 is electrically connected to the rotating tray 1501 and the lifter 1503, respectively, and controls their rotation and lifting respectively; a controller 12 is installed on one side of the stand 2, and the controller 12 is electrically connected to the lifting and rotating platform 15, and controls the lifting and rotating platform 15 to rise, fall, rotate forward, reverse, start or stop.

[0035] The gas path control area 9 includes a fixed plate 905, an air pipe channel fixed on the fixed plate 905, and a cover plate 904 for protecting the air pipe channel. The fixed plate 905 is fixedly connected to the stand 2. A pressure regulating valve 901 is installed at the air inlet of the air pipe channel. The pressure regulating valve 901 is used to control the air inlet pressure. A ball valve switch 7 912 is installed at the exhaust port of the air pipe channel. The ball valve switch 7 912 is used by the user to discharge unnecessary gas. A precision pressure reducing valve 902, a ball valve switch 1 903, a ball valve switch 2 906, a ball valve switch 3 907, a ball valve switch 4 908, a ball valve switch 5 909, a ball valve switch 6 910 and a flow meter are installed on the air pipe channel. 911, the precision pressure reducing valve 902 is used to accurately reduce the pressure to the test pressure, the ball valve switch 1 903 is arranged between the pressure regulating valve 901 and the precision pressure reducing valve 902, and controls the gas flow between the pressure regulating valve 901 and the precision pressure reducing valve 902, the ball valve switch 2 906, the ball valve switch 3 907, and the ball valve switch 4 908 respectively control the output of one gas, the ball valve switch 5 909 is connected in series with the flow meter 911 and then connected to the ball valve switch 2 906, the ball valve switch 3 907 and the ball valve switch 4 908, the ball valve switch 6 910 is connected in parallel with the flow meter 911 and then connected to the ball valve switch 2 906, the ball valve switch 3 907 and the ball valve switch 4 908.

[0036] The working principle of the utility model is:

[0037] Step 1) Material placement: Place the test short pile material in the storage area 202 and the assembly area 201;

[0038] Step 2) Assembly: Take the materials and assemble them in the assembly area 201. After assembly, temporarily block the water outlet 1605, the air outlet 1606, and the hydrogen outlet 1607 with plugs. After the test is completed, remove the plugs. During the assembly process, you can use the tools on the tool summary board 1;

[0039] Step 3) Moving: After the short pile is assembled, the short pile is moved to the test area 203 by using the spring balancer 7 to quickly connect with the hook 1604 on the short pile;

[0040] Step 4) Connecting the gas circuit: first confirm that the ball valve switches 1 903, 2 906, 3 907, 4 908, 5 909, 6 910 in the gas circuit control area 9 are all in the closed state, connect the gas source at the air inlet of the gas circuit control area 9, connect the hydrogen inlet 1601, air inlet 1602, and water inlet 1603 on the test short stack to the outlet ends of the 2 906, 3 907, and 4 908 respectively, and the gas circuit connection is completed;

[0041] Step 5) Test: Open the knob of the pressure regulating valve 901, set the inlet pressure, fully open the ball valve switch 1 903, open the knob of the precision pressure reducing valve 902, and when the outlet pressure reaches the predetermined value, press the knob, and complete the air tightness test by adjusting the opening and closing of the ball valve switch 2 906, the ball valve switch 3 907, the ball valve switch 4 908, the ball valve switch 5 909, the ball valve switch 6 910, etc.;

[0042] Step 6) Recording data: Record the test data. If the leakage exceeds the standard during the test, proceed to step 7);

[0043] Step 7) Underwater test: If the air tightness test finds that the leakage exceeds the standard, the short pile needs to be moved away first, and the movable door 10 is taken out through the handle 11 and placed in the storage area 202. The short pile is then moved to the rotating tray 1501, and the "down" button on the controller 12 is activated to slowly lower the short pile to the underwater detection area 204. At the same time, the three ball valve switches of ball valve switch 2 906, ball valve switch 3 907, and ball valve switch 4 908 are opened to observe the position where bubbles appear in the underwater short pile, and the "forward" and "stop" buttons on the controller 12 are triggered to observe the position where bubbles appear in the short pile from multiple angles and mark them.

[0044] In the utility model, the tool summary plate is used to place the tools used for assembly and some joint accessories. The stand is a fixed overall bracket; the assembly area is an area for short pile assembly; the storage area is an area for placing items, spare parts, short piles to be tested, movable doors, etc.; the test area is an area for placing short piles during air tightness testing; the underwater test area is an area for observing the leakage position of short piles. The control box is a box for placing the power supply of the equipment. The feet are used to adjust the flatness of the test bench. The circular track adopts a smooth round tube, and the spring balancer is hung on it and can slide. The explosion-proof lamp is used for lighting and is explosion-proof. The spring balancer is used to assist the tester in moving the short pile. The water inlet valve connects the water inlet pipe and the water tank, and is a switch for controlling the entry of water.

[0045] The gas circuit control area connects the gas source and the short stack to be tested, and is equipped with components such as a pressure regulating valve, a pressure reducing valve, and a flow meter. The pressure regulating valve is used to control the inlet pressure. The precision pressure reducing valve is used to accurately reduce the pressure to the test pressure. The ball valve switch 1 is used to control the gas flow between the pressure regulating valve and the precision pressure reducing valve. The cover plate is used to protect the gas pipe channel. The fixing plate is used to fix the gas pipe channel on this bottom plate and connect it to the bench. The ball valve switch 2, the ball valve switch 3, and the ball valve switch 4 are respectively used to control the output switches of one gas. The ball valve switch 5 is a switch to control the gas to flow to the ball valve switch 2, the ball valve switch 3, and the ball valve switch 4 after passing through the flow meter. The ball valve switch 6 is used to control the gas to flow directly to the ball valve switch 2, the ball valve switch 3, and the ball valve switch 4 without passing through the flow meter. The flow meter is a tool for detecting leakage. The ball valve switch 7 is used to discharge unnecessary gas to prevent pressure from existing in the gas circuit. The air inlet of the gas circuit control area is connected to the gas source, and each ball valve switch is a switch to control the gas flow.

[0046] The movable door is a movable door with a handle. When underwater testing is required, the movable door can be moved away. The handle is used to facilitate the removal of the movable door. The controller can control the handle of the lifting and rotating table, and has buttons such as "up", "down", "forward", "reverse", "start", and "stop". The water tank uses a transparent material to facilitate observation of the test status in the water tank and has a certain pressure resistance. The drain valve is used to drain the water after the test is completed.

[0047] The lifting and rotating table has a lifting function, which is convenient for the tester to transport the short pile to the test position. It has a rotating function, which is convenient for observing the gas leakage point from multiple angles. This function can be replaced by manual or pneumatic tools. The rotating tray has a rotating function, an inverted cone bottom surface and a mesh structure, which can reduce the water resistance during descent; the sealing component 1 is used for underwater testing to prevent water from entering the internal mechanism during the test; the lifter has a lifting function to transport the short pile to the observation position; the sealing component 2 is used for underwater testing to prevent water from entering the internal mechanism during the test; the control box is an electrical box that controls rotation and lifting.

[0048] In the short pile to be tested, the hydrogen inlet is the inlet for hydrogen to be introduced into the test short pile, the air inlet is the inlet for air to be introduced into the test short pile, the water inlet is the inlet for water to be introduced into the test short pile, the hook is a hook used in conjunction with the 7-spring balancer, the water outlet is the outlet for water to flow out of the test short pile, the air outlet is the outlet for air to flow out of the test short pile, and the hydrogen outlet is the outlet for hydrogen to flow out of the test short pile.

[0049] The utility model is applied to the fuel cell industry and is a gas-tight workbench for testing short stacks of membrane electrode testers; the utility model integrates tools, assembly tables, storage tables, test tables, test water tanks, and gas circuit control consoles (see Figure 1), forming a test bench with multiple functions, saving space, saving time, easy operation and high safety. It consists of four parts: workbench, tool board, gas circuit control panel and water tank. The workbench plays the role of fixing and connecting other components, and has the function of operating desktop and storage; the gas circuit control area can detect the overall sealing of the three gas circuits, and whether there is leakage between every two gas circuits, and the location of the leakage point can be observed underwater.

[0050] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0051] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A workbench for testing the air tightness of a short stack of a membrane electrode, comprising a stand (2), characterized in that: The bench (2) is provided with an assembly area (201) and a test area (203); the assembly area (201) is an area for assembling the short stack to be tested; the test area (203) is an area for placing the short stack to be tested during air tightness testing; a storage area (202) and an underwater test area (204) are respectively provided below the assembly area (201) and the test area (203); the storage area (202) is an area for placing items; the underwater test area (204) is an area for observing the leakage position of the short stack to be tested; a tool summary plate (1) and an air path control area (9) are respectively provided in front of the assembly area (201) and the test area (203); the tool summary plate (1) is used to place tools used for assembly; and the air path control area (9) is used to connect an air source and the short stack to be tested.

2. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: A water inlet valve (8) is provided between the tool summary plate (1) and the air path control area (9), and the water inlet valve (8) is used to connect the water inlet pipe and the water tank and control the entry of water.

3. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: An electric control box (3) is arranged at the bottom of the bench (2), and the electric control box (3) is a box body for placing the power supply of the equipment. A foot (4) is installed at the bottom of the bench (2), and the flatness of the test bench is adjusted by the foot (4). An explosion-proof lamp (6) is installed at the top of the bench (2).

4. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: A movable door (10) is provided at the test area (203), and a handle (11) is installed on the movable door (10). The handle (11) is used to move the movable door (10) away when underwater testing is required.

5. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: The underwater test area (204) is provided with a water tank (13). The water tank (13) is made of a transparent material to facilitate observation of the test conditions in the water tank. A drain valve (14) is installed below the water tank (13). The drain valve (14) is used to drain water after the test is completed.

6. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: A circular track (5) is installed on the top of the bench (2), and a spring balancer (7) is slidably connected to the circular track (5). The spring balancer (7) is used to assist the tester in moving the short pile to be tested.

7. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 6, characterized in that: A hydrogen inlet (1601), an air inlet (1602) and a water inlet (1603) are provided on one side of the short pile to be tested. The hydrogen inlet (1601) is an inlet for introducing hydrogen into the short pile to be tested. The air inlet (1602) is an inlet for introducing air into the short pile to be tested. The water inlet (1603) is an inlet for introducing water into the short pile to be tested. A hook (1604) is installed in the middle of the short pile to be tested. The hook (1604) is used to cooperate with the spring balancer (7). A water outlet (1605), an air outlet (1606) and a hydrogen outlet (1607) are provided on the other side of the short pile to be tested. The water outlet (1605) is an outlet for water to flow out of the short pile to be tested. The air outlet (1606) is an outlet for air to flow out of the short pile to be tested. The hydrogen outlet (1607) is an outlet for hydrogen to flow out of the short pile to be tested.

8. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 1, characterized in that: The underwater test area (204) is provided with a lifting and rotating platform (15), and the lifting and rotating platform (15) is used to transport the short pile to be tested to the test position. The lifting and rotating platform (15) comprises a rotating tray (1501), a sealing component 1 (1502), a lifter (1503), a sealing component 2 (1504) and a control box (1505). The top of the lifter (1503) is connected to the rotating tray (1501) through the sealing component 1 (1502). The bottom surface of the rotating tray (1501) is in an inverted cone shape and has a mesh structure. The bottom end of the lifter (1503) is connected to the control box (1505) through the sealing component 2 (1504). The control box (1505) is electrically connected to the rotating tray (1501) and the lifter (1503) respectively, and controls the rotation and lifting thereof respectively.

9. The air tightness detection workbench for short stacks used in membrane electrode testing as claimed in claim 8, characterized in that: A controller (12) is installed on one side of the platform (2). The controller (12) is electrically connected to the lifting and rotating platform (15) and controls the lifting and rotating platform (15) to rise, fall, rotate forward, reverse, start or stop.

10. The air tightness detection workbench for membrane electrode short stack testing according to any one of claims 1 to 9, characterized in that: The air path control area (9) includes a fixing plate (905), an air pipe channel fixed on the fixing plate (905), and a cover plate (904) for protecting the air pipe channel. The fixing plate (905) is fixedly connected to the stand (2). A pressure regulating valve (901) is installed at the air inlet of the air pipe channel. The pressure regulating valve (901) is used to control the air inlet pressure. A ball valve switch seven (912) is installed at the air outlet of the air pipe channel. The ball valve switch seven (912) is used by the user to discharge unnecessary gas. The air pipe channel is installed with a precision pressure reducing valve (902), a ball valve switch one (903), a ball valve switch two (906), a ball valve switch three (907), a ball valve switch four (908), a ball valve switch five (909), a ball valve switch six (910) and a flow meter ( 911), the precision pressure reducing valve (902) is used to accurately reduce the pressure to the test pressure, the ball valve switch 1 (903) is arranged between the pressure regulating valve (901) and the precision pressure reducing valve (902), and controls the gas flow between the pressure regulating valve (901) and the precision pressure reducing valve (902), the ball valve switch 2 (906), the ball valve switch 3 (907), and the ball valve switch 4 (908) respectively control the output of one gas, the ball valve switch 5 (909) is connected in series with the flow meter (911) and then connected to the ball valve switch 2 (906), the ball valve switch 3 (907), and the ball valve switch 4 (908), the ball valve switch 6 (910) is connected in parallel with the flow meter (911) and then connected to the ball valve switch 2 (906), the ball valve switch 3 (907), and the ball valve switch 4 (908).

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