Air tightness test bench for fuel cell

Abstract

The utility model discloses an air tightness testboard for a fuel cell, and relates to the technical field of fuel cell testing, the air tightness testboard comprises a device body, grooves and second reset springs, one side of an access hole is movably connected with an access cover, the inner wall of the access cover and the outer wall of the access hole are both provided with the grooves, the inner sides of the grooves are provided with sealing air bags, and the sealing air bags are connected with the second reset springs. A pressure gauge is installed at the top end of the device body, air source pipes are evenly installed on the outer wall of one side of the device body, and one end of each air source pipe is connected with a first one-way air inlet device. The access cover is closed, the lock rod is pulled towards one side to be far away from the lock groove, the second damper and the second reset spring are extruded and deformed, then the movable rod is circularly pulled outwards and then extruded inwards, the piston circularly moves up and down, gas in the inflating device enters the sealing gas bag through the connecting pipe, and the sealing gas bag is inflated. Through expansion of the sealing air bag, the problem of poor sealing performance of the access cover is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell testing, in particular to an airtightness testing bench for fuel cells. Background Technique

[0002] A fuel cell is a power generation device that directly converts the chemical energy existing in fuel and oxidant into electrical energy. Fuel and air are respectively fed into the fuel cell, and electricity is miraculously produced. It has positive and negative electrodes and electrolytes on its appearance, like a storage battery. The fuel cell needs to be tested by testing equipment for leakage. If the sealing performance of the inspection cover of the current testing bench is not good, gas leakage in the equipment is likely to occur. Generally, the sealing ring is easy to corrode and shrink, resulting in poor sealing performance, and the equipment does not have a structure to prevent reverse gas leakage. Once leakage occurs, it will affect the test results. In view of this, in-depth research on the above problems has led to the generation of this case. Content of the Utility Model

[0003] The purpose of the utility model is to provide an airtightness testing bench for fuel cells to solve the problems that the existing airtightness testing bench for fuel cells does not have the function of preventing reverse gas leakage and the inspection cover has good sealing performance as mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: An airtightness testing bench for fuel cells, including a device body, a groove and a second return spring. An outer wall of one end of the device body is provided with a control panel, and an inspection opening is arranged on one side of the control panel. An inspection cover is movably connected to one side of the inspection opening, and grooves are arranged on the inner wall of the inspection cover and the outer wall of the inspection opening. A sealing airbag is installed inside the groove. A pressure gauge is installed on the top of the device body. Air source pipes are uniformly installed on an outer wall of one side of the device body, and one end of each air source pipe is connected with a first one-way air intake device.

[0005] Preferably, an air injection device is installed on an outer wall of one side of the inspection cover, and a piston is installed inside the air injection device. An activity rod is connected above the piston.

[0006] Preferably, a connecting pipe is connected to the bottom end of the air injection device, and one end of the connecting pipe is connected with a second one-way air intake device. One end of the second one-way air intake device is fixedly connected with the sealing airbag.

[0007] Preferably, a second damper is installed on an inner wall above the air injection device, and a second return spring is installed on an outer wall of the second damper. One end of the second damper is connected with a locking rod, and a locking groove matched with the locking rod is arranged on an outer wall above the activity rod.

[0008] Preferably, movable frames are installed on the inner sides of the first one-way air intake device and the second one-way air intake device, and sealing plugs are connected to one sides of the movable frames.

[0009] Preferably, the sealing plug is arranged as a cone with rounded corners, and the material of the sealing plug is elastic rubber.

[0010] Preferably, first dampers are installed on the inner walls at both ends of the first one-way air intake device, first return springs are installed on the outer walls of the first dampers, and one ends of the first dampers are fixedly connected to the movable frames.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model provides an air source pipe, a first return spring and a first damper. By using the gas entering the air source pipe and then entering the first one-way air intake device, the gas squeezes the sealing plug to move to the left, the air hole is opened for air intake, and the first return spring and the first damper are stretched and deformed. When there is no air intake, the first return spring and the first damper reset to make the sealing plug block the air hole to the right, avoiding reverse leakage of gas. The second one-way air intake device has the same principle as the first one-way air intake device, solving the problem of reverse leakage of gas;

[0013] The present utility model provides a maintenance cover, a second damper and a second return spring. By closing the maintenance cover and pulling the lock rod to one side to make it away from the lock groove, the second damper and the second return spring are squeezed and deformed. Then, by repeatedly performing the operations of pulling the movable rod outwards and then squeezing the movable rod inwards, the piston moves up and down cyclically, enabling the gas in the air pumping device to enter the sealing airbag through the connecting pipe. Through the expansion of the sealing airbag, the problem of poor sealing of the maintenance cover is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional structure view of the device body of the present utility model;

[0015] Figure 2 is a schematic cross-sectional structure view of the maintenance cover of the present utility model;

[0016] Figure 3 is a schematic cross-sectional structure view of the first one-way air intake device and the second one-way air intake device of the present utility model;

[0017] Figure 4 is of the present utility model Figure 2 is an enlarged structure view at A in the figure.

[0018] In the figure: 1. Device body; 2. Pressure gauge; 3. Gas source pipe; 4. First one-way air intake device; 5. Second one-way air intake device; 6. Connecting pipe; 7. Inflating device; 8. Piston; 9. Sealing airbag; 10. Maintenance cover; 11. Movable rod; 12. Control panel; 13. Maintenance opening; 14. Groove; 15. Movable frame; 16. First return spring; 17. First damper; 18. Sealing plug; 19. Second damper; 20. Second return spring; 21. Lock rod; 22. Lock groove. Detailed implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figures 1-4 , an airtightness test bench for a fuel cell, including a device body 1, a groove 14 and a second return spring 20. An outer wall at one end of the device body 1 is provided with a control panel 12, and a maintenance opening 13 is arranged on one side of the control panel 12. A maintenance cover 10 is movably connected to one side of the maintenance opening 13, and grooves 14 are arranged on the inner wall of the maintenance cover 10 and the outer wall of the maintenance opening 13. A sealing airbag 9 is installed inside the groove 14. A pressure gauge 2 is installed at the top of the device body 1. Gas source pipes 3 are uniformly installed on an outer wall of one side of the device body 1, and one end of each gas source pipe 3 is connected to a first one-way air intake device 4;

[0021] An inflating device 7 is installed on an outer wall of one side of the maintenance cover 10, and a piston 8 is installed inside the inflating device 7. A movable rod 11 is connected above the piston 8;

[0022] The bottom end of the inflating device 7 is connected to a connecting pipe 6, and one end of the connecting pipe 6 is connected to a second one-way air intake device 5. One end of the second one-way air intake device 5 is fixedly connected to the sealing airbag 9;

[0023] A second damper 19 is installed on an inner wall above the inflating device 7, and a second return spring 20 is installed on an outer wall of the second damper 19. One end of the second damper 19 is connected to a lock rod 21, and a lock groove 22 matching the lock rod 21 is arranged on an outer wall above the movable rod 11;

[0024] Specifically, as Figure 2 and Figure 4As shown, when using this structure, by closing the inspection cover 10, pulling the lock rod 21 to one side to move it away from the lock groove 22, the second damper 19 and the second return spring 20 are squeezed and deformed. Then, by repeatedly pulling the movable rod 11 outwards and then squeezing it inwards, the piston 8 moves up and down cyclically, causing the gas in the air pump device 7 to enter the sealed airbag 9 through the connecting pipe 6. Through the expansion of the sealed airbag 9, the sealing performance of the inspection cover 10 is improved.

[0025] Embodiment 2: Movable frames 15 are installed on the inner sides of both the first one-way air intake device 4 and the second one-way air intake device 5, and sealing plugs 18 are connected to one side of each movable frame 15; the sealing plugs 18 are arranged as cones with rounded corners, and the material of the sealing plugs 18 is elastic rubber.

[0026] Inner walls at both ends of the first one-way air intake device 4 are each installed with a first damper 17, and first return springs 16 are installed on the outer walls of the first dampers 17. One end of each first damper 17 is fixedly connected to the movable frame 15.

[0027] Specifically, as shown in Figure 1 、 Figure 2 and Figure 3 When using this structure, when gas enters the air source pipe 3 and then enters the first one-way air intake device 4, the gas squeezes the sealing plug 18 to move to the left, opening the air hole for air intake. The first return spring 16 and the first damper 17 are stretched and deformed. When there is no more air intake, the first return spring 16 and the first damper 17 return to their original positions, causing the sealing plug 18 to block the air hole to the right, preventing gas from leaking back. The second one-way air intake device 5 works on the same principle to prevent gas leakage.

[0028] Working principle: When using this device, first place the battery into the device body 1. Then, gas enters the device body 1 through the air source pipe 3 to maintain a certain pressure value inside the device body 1. When the pressure gauge 2 detects a change in the pressure value, it indicates a leakage of the battery. The inspection cover 10 can be opened for inspection and for putting in and taking out the battery.

[0029] Implementation steps of the first innovation point:

[0030] First step: By closing the inspection cover 10, pulling the lock rod 21 to one side to move it away from the lock groove 22, the second damper 19 and the second return spring 20 are squeezed and deformed. Then, by repeatedly pulling the movable rod 11 outwards and then squeezing it inwards, the piston 8 moves up and down cyclically, causing the gas in the air pump device 7 to enter the sealed airbag 9 through the connecting pipe 6. Through the expansion of the sealed airbag 9, the sealing performance of the inspection cover 10 is improved, thus not affecting the testing work.

[0031] Step 2: By loosening the locking lever 21, the second damper 19 and the second return spring 20 are reset to make the locking lever 21 snap into the locking groove 22 to lock the movable lever 11.

[0032] Implementation steps of the second innovation point:

[0033] Gas enters the gas source pipe 3 and then enters the first one-way air intake device 4. The gas squeezes the sealing plug 18 to move to the left, and the air hole is opened for air intake. The first return spring 16 and the first damper 17 are stretched and deformed. When there is no air intake, the first return spring 16 and the first damper 17 are reset to make the sealing plug 18 block the air hole to the right to prevent gas from leaking back. The second one-way air intake device 5 works on the same principle and gas will not leak.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel cell air tightness test bench, comprising a device body (1), a groove (14) and a second return spring (20), characterized in that: A control panel (12) is installed on the outer wall of one end of the device body (1), and an inspection port (13) is provided on one side of the control panel (12); an inspection cover (10) is movably connected to one side of the inspection port (13), and a groove (14) is provided on the inner wall of the inspection cover (10) and the outer wall of the inspection port (13); a sealing air bag (9) is installed on the inner side of the groove (14); a pressure gauge (2) is installed on the top of the device body (1); an air source pipe (3) is evenly installed on the outer wall of one side of the device body (1), and one end of the air source pipe (3) is connected to a first one-way air inlet device (4).

2. The fuel cell air tightness test bench according to claim 1, characterized in that: An air pumping device (7) is installed on one outer wall of the inspection cover (10), and a piston (8) is installed on the inner side of the air pumping device (7), and a movable rod (11) is connected to the top of the piston (8).

3. The fuel cell air tightness test bench according to claim 2, characterized in that: The bottom end of the air pumping device (7) is connected to a connecting pipe (6), and one end of the connecting pipe (6) is connected to a second one-way air intake device (5), and one end of the second one-way air intake device (5) is fixedly connected to the sealing airbag (9).

4. The fuel cell air tightness test bench according to claim 2, characterized in that: A second damper (19) is installed on the inner wall above the pumping device (7), and a second return spring (20) is installed on the outer wall of the second damper (19); one end of the second damper (19) is connected to a locking rod (21), and the outer wall above the movable rod (11) is provided with a locking groove (22) that matches the locking rod (21).

5. The fuel cell air tightness test bench according to claim 1, characterized in that: A movable frame (15) is installed on the inner side of each of the first one-way air intake device (4) and the second one-way air intake device (5), and a sealing plug (18) is connected to one side of the movable frame (15).

6. The fuel cell air tightness test bench according to claim 5, characterized in that: The sealing plug (18) is configured as a cone with rounded corners, and the material of the sealing plug (18) is configured as elastic rubber.

7. The fuel cell air tightness test bench according to claim 5, characterized in that: The inner walls of both ends of the first one-way air intake device (4) are each installed with a first damper (17), and the outer walls of the first damper (17) are each installed with a first return spring (16), and one end of the first damper (17) is fixedly connected to the movable frame (15).

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