Fuel cell stack air tightness detection device

Abstract

The present invention relates to the technical field of air tightness detection, and discloses a fuel cell stack air tightness detection device, comprising a fuel cell stack body, an air intake pipe being installed on the outer wall of the fuel cell stack body, and an air collecting air bag being sleeved on the outer wall of the air intake pipe. The driving gear is driven by an air pump to rotate through a rotating rod, which can drive the gear ring to rotate on the inner wall of the outer shell, so that multiple driving gears start to rotate, and the rack can be moved along the direction of the driving gear under the rotation of the driving gear, so that the vertices of the six movable plates can be in contact with each other, so that the outside world can be separated from the inner wall of the air intake pipe, which can effectively prevent the outside air from continuing to enter the inner wall of the fuel cell stack body, and can effectively prevent the waste of gas, thereby ensuring the safety and reliability of the fuel cell. Quickly stopping inflation can effectively reduce the amount of gas leakage, thereby reducing the risk of fire or explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to an air tightness detection device for a fuel cell stack. Background Art

[0002] The fuel cell stack air tightness detection device is an important equipment to ensure the safe operation of the fuel cell system. Its design and function are directly related to the safe use of hydrogen and other fuels.

[0003] Gases in the fuel cell stack, such as hydrogen, are flammable and explosive. Leakage of hydrogen can lead to serious safety accidents such as fire or explosion. However, existing fuel cell stack gas tightness detection devices cannot stop the gas filling in time when gas leakage is detected in the fuel cell stack, which can easily lead to the risk of fire or explosion.

[0004] At the same time, hydrogen leakage will directly lead to a decrease in the efficiency of the fuel cell system and reduce the utilization rate of hydrogen. The coolant may evaporate at high temperatures, and vapor diffusion may cause abnormal pressure inside the fuel cell stack. Oxygen is another important reaction gas in the fuel cell stack. Although it is not flammable, leakage will increase the risk of hydrogen combustion or explosion.

[0005] At the same time, gas leakage can easily lead to pressure imbalance inside the battery stack, thereby damaging the equipment and affecting its service life. Gas leakage can easily cause damage to the equipment and increase the cost of repair and replacement of parts, so it needs to be improved. Summary of the Invention

[0006] The present invention provides a fuel cell stack air tightness detection device, which solves the problems raised by the above background technology.

[0007] The present invention provides the following technical solution: a fuel cell stack air tightness detection device, comprising a fuel cell stack body, an air inlet pipe is installed on the outer wall of the fuel cell stack body, an air collecting air bag is sleeved on the outer wall of the air inlet pipe, an air inlet groove and an air outlet groove are provided at both ends of the fuel cell stack body, an air tightness detection component is provided on the top of the air inlet pipe, a placement groove is provided on the inner wall of the fuel cell stack body, a gas leak marking component is provided on the inner wall of the placement groove, an electrode chip 1 is fixedly mounted on one end of the air collecting air bag close to the air inlet pipe, a limit block is fixedly mounted on the top of the air inlet pipe, and an electrode chip 2 is fixedly mounted on one end of the limit block close to the air collecting air bag;

[0008] The air tightness detection component includes an air pump, one end of an air supply pipe is installed on the top of the air pump, and a connecting pipe is fixedly installed on the other end of the air supply pipe, the output end of the air pump is fixedly installed with an air outlet pipe, the bottom of the air outlet pipe is fixedly installed with a fan, the bottom of the fan is fixedly installed with a rotating shaft, the bottom of the rotating shaft is fixedly installed with a bevel gear 1, the outer wall of the bevel gear 1 is meshed with a bevel gear 2, and the outer wall of the bevel gear 2 is installed with a fixing plate.

[0009] As a preferred technical solution of the present invention: the electrode chip one and the electrode chip two have the same shape, and the virtual center line of the electrode chip one coincides with the virtual center line of the electrode chip two. When the electrode chip one contacts the electrode chip two, current will be generated, and the current is electrically connected to the air pump through the controller. The air collecting bag is arranged in a ring shape between the air intake pipe and the fuel cell stack body.

[0010] As a preferred technical solution of the present invention: the center axis of the bevel gear 2 is rotatably sleeved on the inner wall of the fixed plate, the top of the fixed plate is fixedly installed on the top of the inner wall of the intake pipe, the rotating shaft and the bevel gear 1 are arranged perpendicular to each other on the inner wall of the intake pipe, and the bevel gear 1 is rotatably sleeved on the inner wall of the intake pipe.

[0011] As a preferred technical solution of the present invention: a rotating rod is fixedly sleeved at the center of the fixed plate, and a driving gear is fixedly assembled on the end of the rotating rod away from the fixed plate. The outer walls of the driving gear are respectively engaged with a gear ring and a rack. The outer wall of the gear ring is rotatably sleeved with a shell, and the inner wall of the gear ring is engaged with a driving gear. The rack is mounted on a movable plate by mounting bolts, and a sealing ring is fixedly assembled on the outer edge of the movable plate.

[0012] As a preferred technical solution of the present invention: the outer edge of the shell is fixedly mounted on the inner wall of the air intake pipe, the shape of the shell is a hollow ring, the active gear and the driving gear are both rotatably connected to the inner wall of the shell, and the diameter of the circle formed when the tips of the six movable plates contact each other is adapted to the diameter of the air intake pipe.

[0013] As a preferred technical solution of the present invention: the number of the driving gears is five, and the five driving gears and one driving gear are evenly distributed on the inner wall of the gear ring, the thickness of the gear ring and the thickness of the rack are equal to the thickness of the driving gear, the driving gear and the driving gear have the same shape, the number of the racks and the movable plates are six, and the six racks and movable plates are evenly distributed on the outer wall of the gear ring.

[0014] As a preferred technical solution of the present invention: the gas leakage marking assembly includes a vent plate, the outer wall of the vent plate is fixedly equipped with a vent pipe, both ends of the vent plate are equipped with sealing plates, the outer wall of the sealing plate is equipped with a display light, the outer wall of the vent pipe close to the vent plate is provided with an air outlet, the inner wall of the vent plate is inlaid with a gas collecting cylinder, the inner wall of the vent plate is fixedly equipped with a partition, the inner wall of the vent plate is provided with a gas detector, the bottom of the vent pipe is equipped with an anti-backflow layer, and the end of the connecting pipe away from the gas pipe is located on the inner wall of the partition.

[0015] As a preferred technical solution of the present invention: there are four groups of gas detectors, and all four groups of gas detectors are in contact with the leaked gas through the air outlet holes. The inner cavity of the gas detector is provided with an LED chip, and the LED chip is electrically connected to the sealing plate through the control circuit. The cross-section of the partition is in the shape of a "cross".

[0016] As a preferred technical solution of the present invention: the cross-section of the anti-backflow layer is an arc, and the concave part of the arc is located on the inner wall of the gas collecting cylinder. There are four ventilation pipes, and the two ends of the four ventilation pipes are respectively in contact with the air inlet groove, the air outlet groove and the ventilation plate.

[0017] The present invention has the following beneficial effects:

[0018] 1. This fuel cell stack air tightness detection device, through the active gear driven by the air pump to rotate through the rotating rod, can drive the gear ring to rotate on the inner wall of the shell, so that multiple driving gears start to rotate, and the rack can move in the direction of the driving gear under the rotation of the driving gear, so that the vertices of the six movable plates can contact, thereby separating the outside from the inner wall of the intake pipe, effectively preventing the outside air from continuing to enter the inner wall of the fuel cell stack body, and effectively preventing gas waste, ensuring the safety and reliability of the fuel cell. Quickly stopping inflation can effectively reduce the amount of gas leakage, thereby reducing the risk of fire or explosion;

[0019] At the same time, stopping inflation in time can reduce the damage caused by leakage to the equipment, thereby saving subsequent maintenance costs. Quickly stopping inflation can reduce the spread of harmful gases in the air, prevent workers from inhaling toxic or flammable gases, ensure the safety of the working environment and protect the safety of equipment. The device can recycle the leaked gas, which can further improve resource utilization.

[0020] 2. The fuel cell stack air tightness detection device discharges the gas on the inner wall of the vent pipe from the air outlet to the inner wall of the vent plate, allowing the corresponding gas to come into contact with the gas detector, thereby causing the display light to change color. The device can then detect the overall sealing of the fuel cell stack body while judging which vent pipe is leaking by the color of the sealing plate. This allows the device to promptly detect and repair potential leaks, ensuring the sealing of hydrogen inside the stack, thereby reducing safety risks, optimizing fuel cell performance, and reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 This is a structural schematic diagram of the other side of the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of the present invention;

[0025] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the gas detector of the present invention;

[0027] Figure 7 This is a schematic diagram of the air intake pipe structure of the present invention;

[0028] Figure 8 For the present invention Figure 7 A in the middle is an enlarged structural diagram;

[0029] Figure 9 This is a schematic structural diagram of the airtightness detection component of the present invention;

[0030] Figure 10 For the present invention Figure 9 The enlarged structural diagram at B in the middle;

[0031] Figure 11 This is a schematic diagram of the sealing structure of the present invention;

[0032] Figure 12 It is a schematic diagram of the intake state structure of the present invention.

[0033] Figure: 1. Fuel cell stack body; 2. Air intake pipe; 3. Air collecting bag; 4. Air intake slot; 5. Air outlet slot; 6. Air tightness detection assembly; 7. Placement slot; 8. Gas leak marking assembly; 9. Electrode chip 1; 10. Stop block; 11. Electrode chip 2;

[0034] 61. Air pump; 62. Air delivery pipe; 63. Connecting pipe; 64. Air outlet pipe; 65. Fan; 66. Rotating shaft; 67. Bevel gear 1; 68. Bevel gear 2; 69. Fixed plate; 610. Rotating rod; 611. Driving gear; 612. Gear ring; 613. Housing; 614. Driving gear; 615. Rack; 616. Mounting bolts; 617. Moving plate; 618. Sealing ring;

[0035] 81. Ventilation plate; 82. Ventilation pipe; 83. Sealing plate; 84. Indicator light; 85. Air outlet; 86. Gas collecting cylinder; 87. Partition; 88. Gas detector; 89. Anti-backflow layer. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See also Figure 1 - Figure 12 A fuel cell stack air tightness detection device includes a fuel cell stack body 1, an air inlet pipe 2 is installed on the outer wall of the fuel cell stack body 1, an air collecting bag 3 is sleeved on the outer wall of the air inlet pipe 2, an air inlet groove 4 and an air outlet groove 5 are opened at both ends of the fuel cell stack body 1, an air tightness detection component 6 is provided on the top of the air inlet pipe 2, a placement groove 7 is opened on the inner wall of the fuel cell stack body 1, a gas leak marking component 8 is provided on the inner wall of the placement groove 7, an electrode chip 1 is fixedly mounted on the end of the air collecting bag 3 near the air inlet pipe 2, a limit block 10 is fixedly mounted on the top of the air inlet pipe 2, and an electrode chip 2 11 is fixedly mounted on the end of the limit block 10 near the air collecting bag 3;

[0038] The air tightness detection component 6 includes an air pump 61, one end of an air supply pipe 62 is installed on the top of the air pump 61, and the other end of the air supply pipe 62 is fixedly equipped with a connecting pipe 63, the output end of the air pump 61 is fixedly equipped with an air outlet pipe 64, the bottom of the air outlet pipe 64 is fixedly equipped with a fan 65, the bottom of the fan 65 is fixedly equipped with a rotating shaft 66, the bottom of the rotating shaft 66 is fixedly equipped with a bevel gear 1 67, the outer wall of the bevel gear 1 67 is meshed with a bevel gear 2 68, and the outer wall of the bevel gear 2 68 is equipped with a fixing plate 69.

[0039] In the above structure, by opening the air inlet groove 4 and the air outlet groove 5, the device can perform a three-chamber pressure maintenance test on the device when controlling the opening and closing of the air inlet groove 4 and the air outlet groove 5. Before the air tightness test of the device is performed, a preliminary air tightness test can be performed by controlling the opening and closing of the air inlet groove 4 and the air outlet groove 5, thereby ensuring that the subsequent air tightness test of the device can be more accurate.

[0040] In a preferred embodiment: the electrode chip 1 9 and the electrode chip 2 11 have the same shape, and the virtual center line of the electrode chip 1 9 coincides with the virtual center line of the electrode chip 2 11. When the electrode chip 1 9 contacts the electrode chip 2 11, current will be generated, and the current is electrically connected to the air pump 61 through the controller. The air collecting bag 3 is arranged in a ring shape between the air intake pipe 2 and the fuel cell stack body 1.

[0041] In the above structure, when the air collecting airbag 3 collects enough air, it will expand, so that the air collecting airbag 3 expands to the point where the electrode chip 1 9 on the outer wall contacts the electrode chip 2 11. At this time, current will pass through, and this current passes through the controller and is electrically connected to the air pump 61. It can be seen that when the electrode chip 1 9 contacts the electrode chip 2 11, it can serve as a power source to drive the air pump 61 to enable it to start working.

[0042] In a preferred embodiment: the center axis of bevel gear 2 68 is rotatably sleeved on the inner wall of fixed plate 69, the top of fixed plate 69 is fixedly installed on the top of the inner wall of intake pipe 2, the rotating shaft 66 and bevel gear 1 67 are arranged perpendicular to each other on the inner wall of intake pipe 2, and bevel gear 1 67 is rotatably sleeved on the inner wall of intake pipe 2.

[0043] In the above structure, the air pump 61 is driven to inflate the inner cavity of the fan 65 through the air outlet pipe 64, thereby driving the fan 65 to rotate, so that the fan 65 can drive the bevel gear 1 67 to rotate synchronously, so that the bevel gear 2 68 engaged therewith can rotate, and the bevel gear 2 68 can drive the rotating rod 610 to rotate synchronously. At the same time, the installation position of the fixing plate 69 can limit the bevel gear 2 68, which can effectively prevent the bevel gear 2 68 from positional displacement during rotation.

[0044] In a preferred embodiment: a rotating rod 610 is fixedly sleeved at the center of the fixed plate 69, and a driving gear 611 is fixedly assembled on the end of the rotating rod 610 away from the fixed plate 69. The outer walls of the driving gear 611 are respectively engaged with a gear ring 612 and a rack 615. The outer wall of the gear ring 612 is rotatably sleeved with a shell 613, and the inner wall of the gear ring 612 is engaged with a driving gear 614. The rack 615 is installed with a movable plate 617 by means of mounting bolts 616, and a sealing ring 618 is fixedly assembled on the outer edge of the movable plate 617.

[0045] In the above structure, through the linkage between the gear ring 612 and the driving gear 614 and the active gear 611, when the gear ring 612 rotates, it can simultaneously drive the remaining five driving gears 614 to rotate, and the six movable plates 617 of the device can be moved at the same time, so that it can quickly ventilate when opened and ensure good sealing when closed.

[0046] In a preferred embodiment: the outer edge of the shell 613 is fixedly mounted on the inner wall of the intake pipe 2, the shell 613 is in the shape of a hollow ring, the driving gear 611 and the drive gear 614 are both rotatably connected to the inner wall of the shell 613, and the diameter of the circle formed when the tips of the six movable plates 617 contact each other is adapted to the diameter of the intake pipe 2.

[0047] In a preferred embodiment: the number of driving gears 614 is five, and the five driving gears 614 and one driving gear 611 are evenly distributed on the inner wall of the gear ring 612, the thickness of the gear ring 612 and the thickness of the rack 615 are equal to the thickness of the driving gear 611, the driving gear 611 and the driving gear 614 have the same shape, the number of racks 615 and the number of movable plates 617 are both six, and the six racks 615 and movable plates 617 are evenly distributed on the outer wall of the gear ring 612.

[0048] In the above structure, the active gear 611 rotates under the drive of the rotating rod 610, which can drive the gear ring 612 to rotate on the inner wall of the outer shell 613, so that the multiple driving gears 614 engaged with the gear ring 612 start to rotate, and then the rack 615 can move along the direction of the driving gear 614 under the rotation of the driving gear 614, so that the vertices of the six movable plates 617 can contact each other, so that the outside world can be separated from the inner wall of the air intake pipe 2, which can effectively prevent the outside air from continuing to enter the inner wall of the fuel cell stack body 1 and effectively prevent the waste of gas.

[0049] In a preferred embodiment: the gas leakage marking assembly 8 includes a vent plate 81, the outer wall of the vent plate 81 is fixedly equipped with a vent pipe 82, both ends of the vent plate 81 are equipped with sealing plates 83, the outer wall of the sealing plate 83 is equipped with a display light 84, the vent pipe 82 is provided with an air outlet 85 on the outer wall of the side close to the vent plate 81, the inner wall of the vent plate 81 is inlaid with a gas collecting cylinder 86, the inner wall of the vent plate 81 is fixedly equipped with a partition 87, the inner wall of the vent plate 81 is provided with a gas detector 88, and the bottom of the vent pipe 82 is equipped with an anti-backflow layer 89.

[0050] In a preferred embodiment, there are four groups of gas detectors 88, and all four groups of gas detectors 88 are in contact with the leaked gas through the gas outlet 85. The inner cavity of the gas detector 88 is provided with an LED chip, and the LED chip is electrically connected to the sealing plate 83 through the control circuit. The cross section of the partition 87 is in the shape of a cross, and the end of the connecting pipe 63 away from the gas supply pipe 62 is located on the inner wall of the partition 87.

[0051] In the above structure, the gas passing through the inner wall of the vent pipe 82 is discharged from the outlet hole 85 to the inner wall of the vent plate 81, so that the corresponding gas can come into contact with the gas detector 88, thereby causing corresponding changes;

[0052] When hydrogen comes into contact with the gas detector 88, a yellow-green change will occur, and the sealing plate 83 will emit a yellow-green light through the LED chip provided in the inner cavity of the gas detector 88;

[0053] And when oxygen comes into contact with the gas detector 88, a red change will appear, and the sealing plate 83 will emit a red light through the LED chip provided in the inner cavity of the gas detector 88;

[0054] When the coolant vapor comes into contact with the gas detector 88, a dark brown change will occur, and the sealing plate 83 will emit a dark brown light through the LED chip provided in the inner cavity of the gas detector 88;

[0055] When nitrogen comes into contact with the gas detector 88, a golden yellow change will appear, and the LED chip provided in the inner cavity of the gas detector 88 causes the sealing plate 83 to emit a golden light;

[0056] This allows the device to detect the overall sealing of the fuel cell stack body 1 while also being able to determine which vent pipe 82 is leaking by the illuminated color of the sealing plate 83 .

[0057] In a preferred embodiment: the cross-section of the backflow prevention layer 89 is curved, and the concave part of the curve is located on the inner wall of the air collecting cylinder 86. There are four ventilation pipes 82, and the two ends of the four ventilation pipes 82 are respectively in contact with the air inlet groove 4, the air outlet groove 5 and the ventilation plate 81. The top of the inner wall of the air collecting cylinder 86 is connected to the inner wall of the connecting pipe 63.

[0058] In the above structure, through the characteristic that the top of the inner wall of the gas collecting cylinder 86 is connected to the inner wall of the connecting pipe 63, it can be seen that the gas leaked from the inner wall of the gas collecting cylinder 86 can be transported through the gas leaked at the connecting pipe 63, thereby facilitating the detection of gas leakage from the fuel cell stack main body 1, and facilitating the repair of the leakage point of the fuel cell stack main body 1.

[0059] Working principle: when the air tightness of the fuel cell stack body 1 is tested, the gas is transported to the inner wall of the fuel cell stack body 1 through the air inlet groove 4, so that the gas can flow through the inner wall of the fuel cell stack body 1 through the air inlet groove 4, and when the fuel cell stack body 1 has a gas leak, the leaked gas will enter the inner wall of the vent plate 81 through the vent pipe 82, so that the leaked gas can contact the corresponding gas detector 88 after passing through the outlet hole 85, so that it will change color accordingly and pass through the gas detector 88. The inner cavity of the detector 88 is provided with an LED chip to make the sealing plate 83 emit a light of the corresponding color. At the same time, the leaked gas will enter the inner wall of the gas pipe 62 because the top of the inner wall of the gas collecting cylinder 86 is connected to the inner wall of the connecting pipe 63. When the gas collecting bag 3 collects enough gas, it will expand the gas collecting bag 3, so that the electrode chip 1 9 and the electrode chip 2 11 on the outer wall will contact each other. At this time, current will pass through, and this current is electrically connected to the air pump 61 through the controller. It can be seen that when the electrode chip 1 9 and the electrode chip 2 11 are connected, the current will flow through the controller. When the chip 2 11 contacts, it can serve as a power source for driving the air pump 61 to start working, and the air pump 61 can be driven to inflate the inner cavity of the fan 65 through the air outlet pipe 64, thereby driving the fan 65 to rotate, so that the fan 65 can drive the bevel gear 1 67 to rotate synchronously, so that the bevel gear 2 68 meshing with it can rotate, and the bevel gear 2 68 can drive the rotating rod 610 to rotate synchronously, and can drive the gear ring 612 to rotate on the inner wall of the shell 613, so that the gear ring meshing with the gear ring 612 can rotate. Multiple driving gears 614 start to rotate, and then the rack 615 can move along the direction of the driving gear 614 under the rotation of the driving gear 614, so that the vertices of the six movable plates 617 can contact each other, so that it can separate the outside world from the inner wall of the intake pipe 2, and can effectively prevent the outside air from continuing to enter the inner wall of the fuel cell stack body 1, and can effectively prevent the waste of gas. The device can detect the overall sealing of the fuel cell stack body 1 while also timely discovering and repairing potential leakage points.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fuel cell stack air tightness detection device, comprising a fuel cell stack body (1), characterized in that: An air intake pipe (2) is installed on the outer wall of the fuel cell stack body (1), and an air collecting air bag (3) is sleeved on the outer wall of the air intake pipe (2). An air intake groove (4) and an air outlet groove (5) are provided at both ends of the fuel cell stack body (1). An air tightness detection component (6) is provided on the top of the air intake pipe (2). A placement groove (7) is provided on the inner wall of the fuel cell stack body (1), and a gas leakage marking component (8) is provided on the inner wall of the placement groove (7). An electrode chip 1 (9) is fixedly mounted on one end of the air collecting air bag (3) close to the air intake pipe (2). A limit block (10) is fixedly mounted on the top of the air intake pipe (2), and an electrode chip 2 (11) is fixedly mounted on one end of the limit block (10) close to the air collecting air bag (3). The airtightness detection assembly (6) includes an air pump (61), one end of an air delivery pipe (62) is installed on the top of the air pump (61), and the other end of the air delivery pipe (62) is fixedly equipped with a connecting pipe (63), the output end of the air pump (61) is fixedly equipped with an air outlet pipe (64), the bottom of the air outlet pipe (64) is fixedly equipped with a fan (65), the bottom of the fan (65) is fixedly equipped with a rotating shaft (66), the bottom of the rotating shaft (66) is fixedly equipped with a bevel gear 1 (67), the outer wall of the bevel gear 1 (67) is meshed with a bevel gear 2 (68), and the outer wall of the bevel gear 2 (68) is equipped with a fixing plate (69); The electrode chip 1 (9) and the electrode chip 2 (11) have the same shape, and the virtual center line of the electrode chip 1 (9) coincides with the virtual center line of the electrode chip 2 (11). When the electrode chip 1 (9) contacts the electrode chip 2 (11), a current is generated, and the current is electrically connected to the air pump (61) through the controller. The air collecting bag (3) is arranged in a ring shape between the air intake pipe (2) and the fuel cell stack body (1).

2. A fuel cell stack air tightness detection device according to claim 1, characterized in that: The center axis of the bevel gear 2 (68) is rotatably sleeved on the inner wall of the fixed plate (69), and the top of the fixed plate (69) is fixedly installed on the top of the inner wall of the intake pipe (2). The rotating shaft (66) and the bevel gear 1 (67) are perpendicularly arranged on the inner wall of the intake pipe (2), and the bevel gear 1 (67) is rotatably sleeved on the inner wall of the intake pipe (2).

3. A fuel cell stack air tightness detection device according to claim 2, characterized in that: A rotating rod (610) is fixedly sleeved at the center of the fixed plate (69), and a driving gear (611) is fixedly assembled on one end of the rotating rod (610) away from the fixed plate (69). The outer wall of the driving gear (611) is respectively engaged with a gear ring (612) and a rack (615). The outer wall of the gear ring (612) is rotatably sleeved with a housing (613), and the inner wall of the gear ring (612) is engaged with a driving gear (614). The rack (615) is mounted with a movable plate (617) via mounting bolts (616), and a sealing ring (618) is fixedly assembled on the outer edge of the movable plate (617).

4. A fuel cell stack air tightness detection device according to claim 3, characterized in that: The outer edge of the housing (613) is fixedly mounted on the inner wall of the air intake pipe (2). The housing (613) is in the shape of a hollow ring. The driving gear (611) and the drive gear (614) are both rotatably connected to the inner wall of the housing (613). The diameter of the circle formed when the tips of the six movable plates (617) contact each other is adapted to the diameter of the air intake pipe (2).

5. The fuel cell stack air tightness detection device according to claim 4, characterized in that: There are five driving gears (614), and the five driving gears (614) and one driving gear (611) are evenly distributed on the inner wall of the gear ring (612). The thickness of the gear ring (612) and the thickness of the rack (615) are equal to the thickness of the driving gear (611). The driving gear (611) and the driving gear (614) have the same shape. There are six racks (615) and six movable plates (617), and the six racks (615) and movable plates (617) are evenly distributed on the outer wall of the gear ring (612).

6. The fuel cell stack air tightness detection device according to claim 1, characterized in that: The gas leakage marking assembly (8) includes a vent plate (81), the outer wall of the vent plate (81) is fixedly equipped with a vent pipe (82), both ends of the vent plate (81) are equipped with sealing plates (83), the outer wall of the sealing plate (83) is equipped with a display light (84), the outer wall of the vent pipe (82) close to the vent plate (81) is provided with an air outlet (85), the inner wall of the vent plate (81) is inlaid with a gas collecting cylinder (86), the inner wall of the vent plate (81) is fixedly equipped with a partition (87), the inner wall of the vent plate (81) is provided with a gas detector (88), the bottom of the vent pipe (82) is equipped with an anti-backflow layer (89), and the end of the connecting pipe (63) away from the gas transmission pipe (62) is located on the inner wall of the partition (87).

7. A fuel cell stack air tightness detection device according to claim 6, characterized in that: There are four groups of gas detectors (88), and all four groups of gas detectors (88) are in contact with leaked gas through the gas outlet (85). An LED chip is provided in the inner cavity of the gas detector (88), and the LED chip is electrically connected to the sealing plate (83) through the control circuit. The cross section of the partition (87) is in the shape of a "cross".

8. The fuel cell stack air tightness detection device according to claim 7, characterized in that: The cross section of the backflow prevention layer (89) is curved, and the concave portion of the curve is located on the inner wall of the gas collecting cylinder (86). There are four vent pipes (82), and the two ends of the four vent pipes (82) are in contact with the air inlet groove (4), the air outlet groove (5), and the vent plate (81), respectively.

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