Leak detection device for hydrogen fuel stack test bench

Abstract

The utility model relates to the technical field of leak detection, in particular to a leak detection device for a hydrogen fuel stack test board, which comprises a bottom plate, a hydrogen fuel stack fixedly connected to the surface of the bottom plate, a fixed cover fixedly connected to the top of the hydrogen fuel stack, an air inlet plate clamped to the surface of the fixed cover, a groove formed in the bottom plate, and a sealing box arranged at the top of the bottom plate. The bottom of the sealing box is fixedly connected with a rubber pad, the bottom of the rubber pad extends into the groove and abuts against the groove, the top of the sealing box is fixedly connected with a pull ring, the bottom of the bottom plate is fixedly connected with a vacuum suction pump, the bottom of the vacuum suction pump is fixedly connected with an air outlet pipe, and the side face of the sealing box is fixedly connected with an air suction pump. According to the hydrogen fuel stack leakage detection device, the air pump, the connecting pipe, the air pipe and the top pipe are arranged and used in cooperation, air can be sucked at the top and the side face of a hydrogen fuel stack through the air pipe and the top pipe at the same time, hydrogen can be sucked out in time when the hydrogen fuel stack leaks air, the comprehensiveness of hydrogen fuel stack leakage detection is improved, and leakage detection dead corners are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of leak detection, in particular to a leak detection device for a hydrogen fuel cell stack test bench. Background Art

[0002] With the explosive development of the hydrogen fuel cell industry, the demand for fuel cell stacks has continued to increase, and more and more companies have invested in the research and development of fuel cell stacks. Due to the characteristics of hydrogen itself, such as leakage, diffusion, and explosiveness, hydrogen fuel cells have certain safety hazards, and the safety of hydrogen fuel cells has become a primary issue. Therefore, in order to ensure safety, as the core component of the fuel cell, it is a critical step to conduct airtightness testing on the stack during assembly.

[0003] A fuel cell stack air tightness detection device with China's authorized announcement number CN211477521U is used to fill the fuel cell stack with hydrogen through a hydrogen storage tank. After closing the air inlet and outlet of the fuel cell stack, when the fuel cell stack leaks, the color of the reaction between hydrogen and the coating changes, which can quickly distinguish the location of the fuel cell stack leakage. The device of the utility model is light, simple, and reusable, which can greatly save detection costs and leak detection time.

[0004] There are still certain shortcomings in use. During leak detection, only the position of the air outlet can be checked. When leaks occur in other parts of the fuel cell stack, they cannot be detected in time, which will reduce the practicality and scope of use of the leak detection device. At the same time, testing through copper oxide will also increase the cost of detection, which limits the practicality of the leak detection device. Utility Model Content

[0005] The purpose of the utility model is to provide a leak detection device for a hydrogen fuel cell stack test bench to solve the problem proposed in the above-mentioned background technology that only the position of the gas outlet can be leak detected during leak detection, and when leaks occur in other parts of the fuel cell stack, they cannot be detected in time, which will reduce the practicability and scope of use of the leak detection device during use. At the same time, testing through copper oxide will also increase the cost of detection, which limits the practicability of the leak detection device.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A leak detection device for a hydrogen fuel cell stack test bench comprises a base plate, a hydrogen fuel cell stack is fixedly connected to the surface of the base plate, a fixed cover is fixedly connected to the top of the hydrogen fuel cell stack, an air intake plate is clamped on the surface of the fixed cover, a groove is opened in the base plate, a sealing box is arranged on the top of the base plate, a rubber pad is fixedly connected to the bottom of the sealing box, the bottom of the rubber pad extends into the groove and abuts against the groove, a pull ring is fixedly connected to the top of the sealing box, a vacuum pump is fixedly connected to the bottom of the base plate, an air outlet pipe is fixedly connected to the bottom of the vacuum pump, and an air extraction pump is fixedly connected to the side of the sealing box.

[0008] As a preferred solution of the utility model, an air pipe is fixedly connected to one side of the vacuum pump, the air pipe is arranged outside the hydrogen fuel cell stack, and a top pipe is fixedly connected to the top of the air pipe, and the top pipe is opposite to the air intake plate.

[0009] As a preferred solution of the utility model, a connecting pipe is fixedly connected to the other side of the vacuum pump, a water bucket is fixedly connected inside the bottom plate, and a water level sensor is fixedly connected to the inner wall of the water bucket.

[0010] As a preferred solution of the utility model, a connecting cover is fixedly connected to the top of the water bucket, and the bottom of the connecting pipe extends into the connecting cover and is connected to the water bucket.

[0011] As a preferred solution of the utility model, a circular plate is fixedly connected to the surface of the bottom plate, an alarm light is fixedly connected to the top of the circular plate, and the alarm light is electrically connected to the water level sensor.

[0012] As a preferred solution of the utility model, a support seat is fixedly connected to the bottom of the base plate, and anti-slip grooves are provided on the bottom of the support seat.

[0013] As a preferred solution of the utility model, the shape of the trachea is a U-shape, and the material of the trachea is plastic.

[0014] As a preferred solution of the utility model, the sealing box is arranged outside the hydrogen fuel cell stack, and the cross-sectional area of ​​the sealing box is 1.2 times the cross-sectional area of ​​the hydrogen fuel cell stack.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In the utility model, by setting up the coordinated use of the vacuum pump, the connecting pipe, the air pipe and the top pipe, the top and the side of the hydrogen fuel cell stack can be simultaneously sucked through the air pipe and the top pipe. When the hydrogen fuel cell stack leaks, the hydrogen can be sucked out in time, thereby improving the comprehensiveness of the leak detection of the hydrogen fuel cell stack and avoiding the existence of blind spots in the leak detection.

[0017] 2. In the utility model, by setting up the coordinated use of the water level sensor, the alarm light and the water bucket, when hydrogen leaks, the hydrogen can be pumped into the water bucket through the vacuum pump, and the water in the water bucket can be churned. The water level is monitored by the water level sensor. When the water churns, the alarm light sounds. The experimental materials used are relatively simple, avoiding the high cost of using the leak detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a bottom view of the sealing box of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the bottom plate and hydrogen fuel cell stack of the utility model;

[0021] Figure 4 It is a schematic diagram of the internal structure of the water bucket of the utility model.

[0022] In the figure: 1. bottom plate; 2. support seat; 3. sealing box; 4. pull ring; 5. vacuum pump; 6. air outlet pipe; 7. alarm light; 8. bucket; 9. vacuum pump; 10. connecting pipe; 11. air pipe; 12. top pipe; 13. rubber pad; 14. groove; 15. hydrogen fuel cell stack; 16. fixing cover; 17. air intake plate; 18. water level sensor; 19. connecting cover; 20. round plate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] For examples, see Figure 1-4 , the utility model provides a technical solution:

[0025] A leak detection device for a hydrogen fuel cell test bench comprises a base plate 1, a hydrogen fuel cell 15 is fixedly connected to the surface of the base plate 1, a fixed cover 16 is fixedly connected to the top of the hydrogen fuel cell 15, an air intake plate 17 is clamped on the surface of the fixed cover 16, a groove 14 is opened in the base plate 1, a sealing box 3 is arranged on the top of the base plate 1, a rubber pad 13 is fixedly connected to the bottom of the sealing box 3, the bottom of the rubber pad 13 extends into the groove 14 and abuts against the groove 14, a pull ring 4 is fixedly connected to the top of the sealing box 3, a vacuum pump 5 is fixedly connected to the bottom of the base plate 1, an air outlet pipe 6 is fixedly connected to the bottom of the vacuum pump 5, and an air extraction pump 9 is fixedly connected to the side of the sealing box 3.

[0026] In this embodiment, Figure 2 and Figure 3 As shown, one side of the air pump 9 is fixedly connected to an air pipe 11, and the air pipe 11 is arranged outside the hydrogen fuel cell stack 15. The top of the air pipe 11 is fixedly connected to a top pipe 12, and the top pipe 12 is opposite to the air intake plate 17. The other side of the air pump 9 is fixedly connected to a connecting pipe 10, and a water bucket 8 is fixedly connected to the bottom plate 1, and a water level sensor 18 is fixedly connected to the inner wall of the water bucket 8. A connecting cover 19 is fixedly connected to the top of the water bucket 8, and the bottom of the connecting pipe 10 extends into the connecting cover 19 and is connected to the water bucket 8.

[0027] Among them, the top and sides of the hydrogen fuel cell stack 15 can be simultaneously sucked through the air pipe 11 and the top pipe 12. When the hydrogen fuel cell stack 15 leaks, the hydrogen can be sucked out in time, thereby improving the comprehensiveness of the leak detection of the hydrogen fuel cell stack 15 and avoiding blind spots in leak detection.

[0028] In this embodiment, Figure 1 and Figure 4 As shown, a circular plate 20 is fixedly connected to the surface of the base plate 1, an alarm light 7 is fixedly connected to the top of the circular plate 20, the alarm light 7 is electrically connected to the water level sensor 18, a support seat 2 is fixedly connected to the bottom of the base plate 1, and anti-slip grooves are provided on the bottom of the support seat 2. The shape of the air pipe 11 is a U-shape, and the material of the air pipe 11 is plastic. The sealing box 3 is arranged outside the hydrogen fuel cell stack 15, and the cross-sectional area of ​​the sealing box 3 is 1.2 times the cross-sectional area of ​​the hydrogen fuel cell stack 15.

[0029] Among them, when hydrogen leaks, the hydrogen can be pumped into the water bucket 8 through the vacuum pump 9, and the water in the water bucket 8 is caused to churn. The water level is monitored by the water level sensor 18. When the water churns, the alarm light 7 sounds. The experimental materials used are relatively simple, avoiding the high cost of using a leak detection device.

[0030] The working process of the utility model is as follows: when the leak detection device for the hydrogen fuel cell test bench designed by the present invention is in operation, hydrogen is introduced into the hydrogen fuel cell 15 through the air intake plate 17, and then the rubber pad 13 at the bottom of the sealing box 3 is placed in the groove 14, and then the switch of the vacuum pump 5 is turned on, and the gas between the gas sealing box 3 and the hydrogen fuel cell 15 is extracted by the vacuum pump 5, so that the gas sealing box 3 and the hydrogen fuel cell 15 remain sealed, and then the switch of the vacuum pump 9 is turned on. When hydrogen leaks from the hydrogen fuel cell 15, the leaked hydrogen is introduced into the water bucket 8 through the connecting pipe 10 by the vacuum pump 9, so that the water in the water bucket 8 churns, and then the water level is monitored by the water level sensor 18, and then a beeping sound is emitted through the alarm light 7, so that the hydrogen fuel cell 15 can be detected for hydrogen leaks.

[0031] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leak detection device for a hydrogen fuel cell stack test bench, comprising a bottom plate (1), characterized in that: The surface of the bottom plate (1) is fixedly connected with a hydrogen fuel cell stack (15). The top of the hydrogen fuel cell stack (15) is fixedly connected with a fixing cover (16). The surface of the fixing cover (16) is snap-connected with an air inlet plate (17). A groove (14) is formed in the bottom plate (1). A sealing box (3) is arranged on the top of the bottom plate (1). The bottom of the sealing box (3) is fixedly connected with a rubber pad (13). The bottom of the rubber pad (13) extends into the groove (14) and abuts against the groove (14). The top of the sealing box (3) is fixedly connected with a pull ring (4). The bottom of the bottom plate (1) is fixedly connected with a suction vacuum pump (5). The bottom of the suction vacuum pump (5) is fixedly connected with an air outlet pipe (6). The side of the sealing box (3) is fixedly connected with an air extraction pump (9).

2. A leak detection device for a hydrogen fuel cell stack test bench according to claim 1, characterized in that: One side of the air extraction pump (9) is fixedly connected with an air pipe (11). The air pipe (11) is arranged outside the hydrogen fuel cell stack (15). The top of the air pipe (11) is fixedly connected with a top pipe (12). The top pipe (12) is opposite to the air inlet plate (17) in position.

3. A leak detection device for a hydrogen fuel cell stack test bench according to claim 2, characterized in that: The other side of the air extraction pump (9) is fixedly connected with a connecting pipe (10). A water bucket (8) is fixedly connected in the bottom plate (1). A water level sensor (18) is fixedly connected to the inner wall of the water bucket (8).

4. A leak detection device for a hydrogen fuel cell stack test bench according to claim 3, characterized in that: The top of the water bucket (8) is fixedly connected with a connecting cover (19). The bottom of the connecting pipe (10) extends into the connecting cover (19) and communicates with the water bucket (8).

5. A leak detection device for a hydrogen fuel cell stack test bench according to claim 1, characterized in that: The surface of the bottom plate (1) is fixedly connected with a circular plate (20). The top of the circular plate (20) is fixedly connected with an alarm lamp (7). The alarm lamp (7) is electrically connected with the water level sensor (18).

6. A leak detection device for a hydrogen fuel cell stack test bench according to claim 1, characterized in that: The bottom of the bottom plate (1) is fixedly connected with a support base (2). The bottom of the support base (2) is provided with anti-slip patterns.

7. A leak detection device for a hydrogen fuel cell stack test bench according to claim 2, characterized in that: The shape of the air pipe (11) is in a figure-eight shape. The material of the air pipe (11) is plastic.

8. A leak detection device for a hydrogen fuel cell stack test bench according to claim 1, characterized in that: The sealing box (3) is arranged outside the hydrogen fuel cell stack (15). The cross-sectional area of the sealing box (3) is 1.2 times that of the hydrogen fuel cell stack (15).

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