Hydrogen leakage detection device for hydrogen transport long tube trailer

Abstract

This invention relates to the field of hydrogen detection technology, and more particularly to a hydrogen leak detection device for long-tube hydrogen transport trailers. The technical problem is that vibrations from different road surfaces, aging from prolonged use, and vehicle collisions can all cause leaks in the hydrogen storage tanks of long-tube trailers, potentially leading to combustion or explosion, thus threatening the lives of pedestrians and drivers. Furthermore, when leaked hydrogen burns, the flames cannot be extinguished in time, resulting in the complete destruction of surrounding equipment and significant economic losses. The technical solution of this invention is a hydrogen leak detection device for long-tube hydrogen transport trailers, including a carrying box and a movable door; the movable door is movably connected to the upper side of the carrying box. This invention enables the detection of leak sources by observing alarms issued by hydrogen detectors, facilitating the driver to move the leaking hydrogen tank to an open area, preventing the leaking hydrogen tank from affecting other hydrogen tanks, thereby improving the safety of the remaining hydrogen tanks.

Description

Technical Field

[0001] This invention relates to the field of hydrogen detection technology, and in particular to a hydrogen leak detection device for hydrogen transport long-tube trailers. Background Technology

[0002] Hydrogen is the lightest gas in nature and is extremely flammable with a wide explosion limit.

[0003] According to Chinese patent application number CN202122804687.2, a hydrogen transport device with a leakage alarm function, this patent enables the rapid installation and disassembly of the hydrogen detector body through the snap-fit ​​of the insert plate and the rectangular plate, facilitating the quick replacement of the new hydrogen detector body and ensuring high reliability. However, this patent does not provide emergency handling for hydrogen tank leaks during trailer transport. In the prior art, if a hydrogen tank leaks during trailer transport, it can easily lead to a hydrogen explosion, thereby threatening the lives of pedestrians and drivers.

[0004] At the same time, when the leaked hydrogen burns, the flame cannot be extinguished in time, causing the equipment around the flame to be burned to ashes, resulting in huge economic losses. Summary of the Invention

[0005] To overcome the drawbacks of hydrogen tank leaks causing explosions that threaten the lives of pedestrians and drivers, and the inability to extinguish the flames in time when leaked hydrogen burns, resulting in the destruction of surrounding equipment and causing significant economic losses, this invention provides a hydrogen leak detection device for hydrogen transport trailers.

[0006] The technical solution of this invention is as follows: a hydrogen leak detection device for a long-tube hydrogen transport trailer, comprising a carrier box and a movable door; the movable door is movably connected to the upper side of the carrier box; a handle is installed on the upper side of the movable door; several hydrogen tanks are placed inside the carrier box; it also includes a detection component, a waterproof sleeve, a liquid storage bag, a squeezing component, a pressure relief component, and a fire extinguishing system; a detection component for detecting the location of hydrogen leaks is provided on the upper side of the movable door; several waterproof sleeves for preventing the detection component from becoming clogged are installed on the detection component; several liquid storage bags for preventing flames from entering the carrier box in the event of a fire are installed on the detection component; each liquid storage bag is located on the upper side of an adjacent waterproof sleeve; a squeezing component for spraying flame retardant liquid onto the liquid storage bag is provided on the detection component; a pressure relief component for preventing the movable door from being unable to open is provided inside the movable door; and a fire extinguishing system for preventing explosions caused by hydrogen combustion is installed on the detection component.

[0007] As a preferred embodiment of the present invention, the detection assembly includes a connecting cylinder, a hydrogen detector, a U-shaped tube, and a first nozzle; several connecting cylinders are connected to the movable door; the inner side of each connecting cylinder is fixedly connected to an adjacent waterproof sleeve; a hydrogen detector for detecting the hydrogen content in the air is fixedly connected to the inner side of each waterproof sleeve; a first nozzle is connected to the upper side of each connecting cylinder; and a U-shaped tube for preventing rainwater from entering the connecting cylinder is connected to the lower side of each first nozzle.

[0008] As a preferred embodiment of the present invention, the pressure relief assembly includes a connecting pipe, a valve, a dust filter, and a pressure sensor; the connecting pipe is connected to the middle of the inner side of the sliding door; the connecting pipe is connected to each waterproof sleeve; the valve is connected to the front side of the connecting pipe; a dust filter for preventing dust from entering the valve is movably connected to the front side of the sliding door; and a pressure sensor is fixedly connected to the inner side of the connecting pipe.

[0009] As a preferred embodiment of the present invention, the extrusion assembly includes a first connecting rod, an extrusion block, and a second connecting rod; a plurality of first connecting rods are slidably connected to the upper side of the movable door; one end of each first connecting rod near the center of the movable door is fixedly connected to an adjacent liquid storage bag; each first connecting rod is slidably connected to an adjacent connecting cylinder; the other end of each first connecting rod is fixedly connected to an extrusion block; a second connecting rod is fixedly connected between every two adjacent liquid storage bags; each second connecting rod is slidably connected to two adjacent connecting cylinders.

[0010] As a preferred embodiment of the present invention, the waterproof sleeve is designed with a constricted opening.

[0011] As a preferred embodiment of the present invention, it further includes telescopic limiting rods; a plurality of telescopic limiting rods for limiting the extrusion blocks are slidably connected on the movable door; each telescopic limiting rod is in contact with the adjacent extrusion block.

[0012] As a preferred embodiment of the present invention, the fire extinguishing system includes a first one-way valve, a second one-way valve, and a second nozzle; a first one-way valve for preventing the volume of flame-retardant liquid from decreasing is fixedly connected to the rear side of each U-tube; a second one-way valve is fixedly connected to the front side of each U-tube; and a second nozzle for reducing the hydrogen combustion effect of the first nozzle is fixedly connected to the upper side of each second one-way valve.

[0013] As a preferred embodiment of the present invention, each second nozzle is configured in a constricted shape.

[0014] As a preferred embodiment of the present invention, it further includes a waterproof cover; each waterproof sleeve has a waterproof cover rotatably connected to its upper side to prevent condensate between the waterproof sleeve and the connecting cylinder from entering the waterproof sleeve.

[0015] As a preferred embodiment of the present invention, a sealing gasket is also included; a sealing gasket for improving the waterproof effect of the waterproof cover is fixedly attached to the underside of each waterproof cover.

[0016] Beneficial effects: This invention enables the approximate location of a leaking hydrogen tank by observing the alarm emitted by the hydrogen detector, thereby narrowing down the search for the leak source. This allows the driver to easily move the leaking hydrogen tank to an open area, preventing the leak from affecting other hydrogen tanks and causing greater economic losses or safety hazards, thus improving the safety of the remaining hydrogen tanks. By squeezing the liquid storage bag, deformation is caused, allowing the flame-retardant liquid inside the storage bag to spray out into the U-shaped tube.

[0017] Furthermore, the leaking hydrogen is blocked by the flame retardant liquid, thereby preventing further leakage of hydrogen and avoiding an explosion caused by excessively high hydrogen concentration around the carrier box.

[0018] The first one-way valve prevents the flame retardant liquid from flowing out from the back of the U-shaped tube into the connecting cylinder due to excessive force when sprayed from the storage bag. This reduces the volume of the flame retardant liquid in the U-shaped tube, thus decreasing the protective effect of the flame retardant liquid against backfire when hydrogen is burned by the first nozzle.

[0019] The flame retardant liquid sprayed out extinguishes the flame of hydrogen combustion on the first nozzle, preventing deformation and damage to the first nozzle caused by continuous combustion of hydrogen, thereby improving the service life of the first nozzle.

[0020] By sealing the upper side of the waterproof sleeve with a waterproof cap, condensation water is prevented from flowing back into the waterproof sleeve due to suction, further improving the protection of the hydrogen detector. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the hydrogen leak detection device for hydrogen transport long-tube trailers of the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the combination of the sliding door, valve, and dustproof device of the present invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the extrusion assembly of the present invention;

[0025] Figure 5 This is a three-dimensional structural diagram of the waterproof sleeve, liquid storage bag, and detection component assembly of the present invention; Figure 6 This is a three-dimensional structural diagram of the fire extinguishing system of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the waterproof sleeve, waterproof cap, and sealing gasket assembly of the present invention.

[0027] The components in the diagram are labeled as follows: 1-carrying box, 2-moving door, 3-hydrogen tank, 4-waterproof sleeve, 5-liquid storage bag, 101-connecting cylinder, 102-hydrogen detector, 103-U-tube, 104-first nozzle, 201-connecting pipe, 202-valve, 203-dustproof device, 301-first connecting rod, 302-squeezing block, 303-second connecting rod, 304-telescopic limiting rod, 401-first one-way valve, 402-second one-way valve, 403-second nozzle, 501-waterproof cover, 502-sealing gasket. Detailed Implementation

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0029] Example 1

[0030] like Figures 2-5 As shown, a hydrogen leak detection device for a hydrogen transport tube trailer includes a carrying box 1 and a movable door 2; the movable door 2 is movably connected to the upper side of the carrying box 1; a handle is installed on the upper rear part of the movable door 2; and several hydrogen tanks 3 are placed inside the carrying box 1.

[0031] It also includes a detection component, a waterproof sleeve 4, a liquid storage bag 5, a compression component, a pressure relief component, and a fire extinguishing system; the detection component is installed on the upper side of the sliding door 2; four waterproof sleeves 4 are installed on the detection component; four liquid storage bags 5 are installed on the detection component; each liquid storage bag 5 is located on the upper side of the adjacent waterproof sleeve 4; a compression component is installed on the detection component; a pressure relief component is installed on the inner side of the sliding door 2; and a fire extinguishing system is installed on the detection component.

[0032] The detection assembly includes a connecting cylinder 101, a hydrogen detector 102, a U-shaped tube 103, and a first nozzle 104; four symmetrical connecting cylinders 101 are connected to the movable door 2; the lower inner part of each connecting cylinder 101 is fixedly connected to the adjacent waterproof sleeve 4; a hydrogen detector 102 is fixedly connected to the middle inner part of each waterproof sleeve 4; a first nozzle 104 is connected to the upper side of each connecting cylinder 101; and a U-shaped tube 103 is connected to the lower side of each first nozzle 104.

[0033] The pressure relief assembly includes a connecting pipe 201, a valve 202, a dust cover 203, and a pressure sensor; the connecting pipe 201 is connected to the middle of the inner side of the sliding door 2; the connecting pipe 201 is connected to each waterproof sleeve 4; the valve 202 is connected to the front side of the connecting pipe 201; the dust cover 203 is movably connected to the front side of the sliding door 2; and the pressure sensor is fixedly connected to the front of the inner side of the connecting pipe 201.

[0034] The extrusion assembly includes a first connecting rod 301, an extrusion block 302, and a second connecting rod 303; four first connecting rods 301 are slidably connected to the upper side of the movable door 2; one end of each first connecting rod 301 near the center of the movable door 2 is fixedly connected to an adjacent liquid storage bag 5; each first connecting rod 301 is slidably connected to an adjacent connecting cylinder 101; an extrusion block 302 is fixedly connected to the other end of each first connecting rod 301; a second connecting rod 303 is fixedly connected between every two adjacent liquid storage bags 5; each second connecting rod 303 is slidably connected to two adjacent connecting cylinders 101.

[0035] The waterproof sleeve 4 is designed with a narrow opening; this reduces the upper diameter of the waterproof sleeve 4, thereby reducing the probability that condensate generated on the lower side of the first nozzle 104 will drip down and fall into the waterproof sleeve 4, thus improving the protective effect of the waterproof sleeve 4 on the hydrogen detector 102.

[0036] It also includes telescopic limit rods 304; four symmetrical telescopic limit rods 304 are slidably connected to the movable door 2; each telescopic limit rod 304 is in contact with the adjacent extrusion block 302; the telescopic limit rods 304 limit the extrusion block 302, so as to avoid the carrier box 1 from bumping during the process of loading or unloading, which would cause the extrusion block 302 to be squeezed and cause the flame retardant liquid in the liquid storage bag 5 to flow out, thus causing unnecessary waste and improving the economic efficiency of the equipment.

[0037] First, a forklift is used to move the carrier box 1 and hydrogen tank 3 onto a trailer. After the trailer is fully loaded with the carrier box 1 and hydrogen tank 3, it starts to drive on the road and transports the hydrogen tank 3 to its destination. During the trailer's journey, the carrier box 1 and the sliding door 2 protect the hydrogen tank 3 and prevent it from aging faster due to factors such as sun exposure, rain, and dust, thereby improving the service life of the hydrogen tank 3.

[0038] Then, since hydrogen is the lightest gas, when hydrogen tank 3 leaks during trailer travel, the hydrogen will move upwards into the adjacent connecting cylinder 101. Upon contact with the hydrogen detector 102 therein, the hydrogen detector 102 will issue an alarm signal, alerting the driver. Simultaneously, because the connecting cylinder 101 is located in... Figure 3As shown in the diagram, when the hydrogen detector 102 issues an alarm, by observing which hydrogen detector 102 issued the alarm, the approximate location of the leaking hydrogen tank 3 can be determined, thus narrowing down the search for the leak source. This facilitates the driver moving the leaking hydrogen tank 3 to an open area, preventing the leaking hydrogen tank 3 from affecting other hydrogen tanks 3 and causing greater economic losses or safety hazards, thereby improving the safety of the remaining hydrogen tanks 3. Subsequently, the leaked hydrogen will be sprayed out of the carrying box 1 through the U-shaped pipe 103 and the first nozzle 104, dissipating into the air. At the same time, in rainy weather, the U-shaped pipe 103 prevents rainwater from entering through the first nozzle 104, thus preventing the hydrogen detector 102 from being corroded by rainwater and improving the safety of the hydrogen. The lifespan of detector 102 is extended. Additionally, due to the low temperature during hydrogen leakage, condensation occurs when hydrogen comes into contact with the inner wall of connecting cylinder 101, resulting in a large amount of condensate on the inner wall. Therefore, a waterproof sleeve 4 protects the hydrogen detector 102, preventing condensate from flowing onto it and causing frost formation, which would interfere with its operation and improve detection efficiency. Furthermore, the narrowed opening of the waterproof sleeve 4 reduces the probability of condensate from the lower side of the first nozzle 104 dripping into the sleeve, thus enhancing its protective effect on the hydrogen detector 102.

[0039] Then, if the hydrogen tank 3 leaks during rainy weather, and the bottom of the U-shaped pipe 103 is filled with rainwater, the hydrogen will not be able to flow out to the outside of the carrier box 1 along the U-shaped pipe 103, thereby increasing the gas pressure inside the carrier box 1 and causing a safety hazard inside the carrier box 1. Therefore, when the U-shaped pipe 103 is blocked by rainwater, the hydrogen will flow along the connecting pipe 201 to the pressure sensor and valve 202. When the hydrogen concentration reaches 1%, the pressure sensor will sound an alarm, thereby opening the valve 202, which will allow the hydrogen to flow to the outside of the carrier box 1. At the same time, the airflow to the outside of the carrier box 1 will push open the dust cover 203, thereby depressurizing the carrier box 1 and preventing the carrier box 1 from becoming too pressurized, which could lead to an explosion. This will improve the protection of the driver.

[0040] Subsequently, if the trailer overturns due to a leak in hydrogen tank 3, causing it to move forward due to inertia, and if the hydrogen from tank 3 continues to leak, the hydrogen emitted from the first nozzle 104 will cause an excessively high hydrogen concentration at the edge of the carrying box 1. The friction between the trailer and the road surface will generate heat, which, upon contact with the hydrogen, could easily ignite or even explode, posing a significant safety hazard and seriously endangering the lives of pedestrians and drivers. Therefore, when the trailer overturns, the left-right reference of this invention changes to the up-down direction. The compression block 302, compressed by the road surface, will move upwards, thereby causing the first connecting rod 301 to move upwards. This compression will then compress the storage bag 5, causing it to deform and allowing the flame-retardant liquid inside to spray out into the U-shaped tube 103. The flame-retardant liquid will then block the leaking hydrogen, preventing further leakage and avoiding an excessively high hydrogen concentration around the carrying box 1 that could lead to an explosion. This, in turn, increases the risk of hydrogen leakage from tank 3. Safety during leakage is ensured. Furthermore, when the hydrogen burning at the first nozzle 104 undergoes a backfire along the U-shaped tube 103 and the first nozzle 104, the flame-retardant liquid prevents the hydrogen tank 3 from exploding due to backfire, thus improving the protection of the hydrogen tank 3. Simultaneously, when the storage bag 5 is squeezed by the first connecting rod 301, the storage bag 5 deforms and moves upwards, thereby driving the second connecting rod 303 upwards, which in turn squeezes the upper storage bag 5, causing the flame-retardant liquid in the upper storage bag 5 to flow out into the U-shaped tube 103, thus blocking the upper hydrogen leakage. At the same time, the telescopic limiting rod 304 limits the squeezing block 302, preventing the carrier box 1 from being bumped during loading or unloading, which could cause the squeezing block 302 to be squeezed and the flame-retardant liquid in the storage bag 5 to flow out, thus causing unnecessary waste and improving the economic efficiency of the equipment. Moreover, all the above parts are made of lightweight materials such as aluminum alloy.

[0041] Example 2

[0042] Based on Example 1, such as Figure 6 As shown, the fire extinguishing system includes a first one-way valve 401, a second one-way valve 402, and a second nozzle 403; a first one-way valve 401 is fixedly connected to the upper rear side of each U-tube 103; a second one-way valve 402 is fixedly connected to the upper front side of each U-tube 103; and a second nozzle 403 is fixedly connected to the upper side of each second one-way valve 402.

[0043] Each second nozzle 403 is designed with a constricted opening, allowing the flame retardant liquid to be sprayed upwards a greater distance, thereby improving the protective effect of the flame retardant liquid on the first nozzle 104.

[0044] When the storage bag 5 sprays out flame retardant liquid due to compression, the first one-way valve 401 prevents the flame retardant liquid from flowing out from the rear side of the U-shaped tube 103 into the connecting cylinder 101 due to excessive force from the spray from the storage bag 5. This reduces the volume of flame retardant liquid in the U-shaped tube 103, thus reducing its protective effect against backfire when the hydrogen gas sprayed from the first nozzle 104 ignites. Simultaneously, the first one-way valve 401 and the second one-way valve 402 block the flame retardant liquid, forming a sealed space between the U-shaped tube 103, the first one-way valve 401, and the second one-way valve 402. When backfire occurs when the hydrogen gas sprayed from the first nozzle 104 ignites, the temperature inside the U-shaped tube 103 will rise, increasing the pressure within the sealed space. This causes the flame retardant liquid to spray upwards due to excessive pressure. Since the flame retardant liquid has no... The flame retardant liquid passes through the first one-way valve 401, and therefore passes through the second one-way valve 402. Under the limitation of the second nozzle 403, it is sprayed onto the upper side of the first nozzle 104. The flame retardant liquid extinguishes the flame of hydrogen combustion on the first nozzle 104, preventing deformation and damage to the first nozzle 104 due to continuous combustion of hydrogen, thereby improving the service life of the first nozzle 104. At the same time, because the second nozzle 403 is designed with a constricted opening, the speed of the flame retardant liquid when passing through the second nozzle 403 is increased, allowing the flame retardant liquid to be sprayed upward a greater distance. This prevents the flame retardant liquid from failing to reach the first nozzle 104, thus improving the protective effect of the flame retardant liquid on the first nozzle 104.

[0045] Example 3

[0046] Based on Examples 1 and 2, such as Figure 1 and Figure 7 As shown, it also includes a waterproof cover 501; each waterproof sleeve 4 has a waterproof cover 501 connected to its upper side by a torsion spring; when rescuers depressurize the carrying box 1 through valve 202, the rapid flow of hydrogen to valve 202 creates suction at the connection between the connecting pipe 201 and the waterproof sleeve 4, causing the condensate on the wall of the connecting cylinder 101 to move rapidly downwards under the suction. If there is too much condensate between the waterproof sleeve 4 and the connecting cylinder 101, it will cause backflow under the suction, resulting in condensate flowing into the waterproof sleeve 4. Therefore, when valve 202 depressurizes the carrying box 1, based on a left-to-right view, the suction causes the waterproof cover 501 to rotate counterclockwise to the desired position. Figure 7 As shown, the waterproof cover 501 seals the upper side of the waterproof sleeve 4, preventing condensate from flowing back into the waterproof sleeve 4 due to suction, thus further improving the protection of the hydrogen detector 102.

[0047] It also includes a sealing gasket 502; a sealing gasket 502 is fixedly attached to the lower side of each waterproof cover 501; the sealing gasket 502 seals the upper side of the waterproof sleeve 4 to prevent condensate from entering the waterproof sleeve 4 through the gap between the waterproof cover 501 and the waterproof sleeve 4 when the height of the condensate exceeds the height of the waterproof sleeve 4, thereby improving the protective effect of the waterproof cover 501 against condensate.

[0048] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A hydrogen leak detection device for a hydrogen transport long-tube trailer, comprising a carrier box (1) and a movable door (2); the movable door (2) is movably connected to the upper side of the carrier box (1); a handle is installed on the upper side of the movable door (2); a plurality of hydrogen tanks are placed inside the carrier box (1); characterized in that: It also includes a detection component, a waterproof sleeve (4), a liquid storage bag (5), a squeezing component, a pressure relief component, and a fire extinguishing system; a detection component for detecting the location of hydrogen leaks is provided on the upper side of the sliding door (2); several waterproof sleeves (4) are installed on the detection component to prevent the detection component from being blocked; several liquid storage bags (5) are installed on the detection component to prevent flames from entering the carrier box (1) when a fire occurs; each liquid storage bag (5) is located on the upper side of the adjacent waterproof sleeve (4); a squeezing component is provided on the detection component to spray flame retardant liquid onto the liquid storage bag (5); a pressure relief component is provided on the inner side of the sliding door (2) to prevent the sliding door (2) from being unable to be opened; a fire extinguishing system is installed on the detection component to prevent hydrogen combustion from causing an explosion.

2. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 1, characterized in that: The detection assembly includes a connecting tube (101), a hydrogen detector (102), a U-tube (103), and a first nozzle (104); several connecting tubes (101) are connected to the movable door (2); the inner side of each connecting tube (101) is fixed to the adjacent waterproof sleeve (4); a hydrogen detector (102) for detecting the hydrogen content in the air is fixed to the inner side of each waterproof sleeve (4); a first nozzle (104) is connected to the upper side of each connecting tube (101); a U-tube (103) for preventing rainwater from entering the connecting tube (101) is connected to the lower side of each first nozzle (104).

3. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 1, characterized in that: The pressure relief assembly includes a connecting pipe (201), a valve (202), a dust filter (203), and a pressure sensor; the connecting pipe (201) is connected to the middle of the inner side of the sliding door (2); the connecting pipe (201) is connected to each waterproof sleeve (4); the valve (202) is connected to the front side of the connecting pipe (201); the dust filter (203) for preventing dust from entering the valve (202) is movably connected to the front side of the sliding door (2); the pressure sensor is fixed to the inner side of the connecting pipe (201).

4. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 2, characterized in that: The extrusion assembly includes a first connecting rod (301), an extrusion block (302), and a second connecting rod (303); several first connecting rods (301) are slidably connected to the upper side of the movable door (2); one end of each first connecting rod (301) near the center of the movable door (2) is fixedly connected to an adjacent liquid storage bag (5); each first connecting rod (301) is slidably connected to an adjacent connecting cylinder (101); an extrusion block (302) is fixedly connected to the other end of each first connecting rod (301); a second connecting rod (303) is fixedly connected between every two adjacent liquid storage bags (5); each second connecting rod (303) is slidably connected to two adjacent connecting cylinders (101).

5. A hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 3, characterized in that: The waterproof sleeve (4) is set in a constricted state.

6. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 4, characterized in that: It also includes telescopic limiting rods (304); several telescopic limiting rods (304) for limiting the extrusion block (302) are slidably connected on the movable door (2); each telescopic limiting rod (304) is in contact with the adjacent extrusion block (302).

7. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 2, characterized in that: The fire extinguishing system includes a first check valve (401), a second check valve (402), and a second nozzle (403); a first check valve (401) is fixed to the rear side of each U-tube (103) to prevent the volume of the flame retardant liquid from decreasing; a second check valve (402) is fixed to the front side of each U-tube (103); and a second nozzle (403) is fixed to the upper side of each second check valve (402) to reduce the hydrogen combustion effect of the first nozzle (104).

8. The hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 7, characterized in that: Each second nozzle (403) is designed with a constricted opening.

9. A hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 5, characterized in that: It also includes a waterproof cap (501); each waterproof sleeve (4) has a waterproof cap (501) rotatably connected to the upper side to prevent condensation between the waterproof sleeve (4) and the connecting cylinder (101) from entering the waterproof sleeve (4).

10. A hydrogen leak detection device for a hydrogen transport long-tube trailer according to claim 9, characterized in that: It also includes a sealing gasket (502); a sealing gasket (502) is fixed to the underside of each waterproof cover (501) to improve the waterproof effect of the waterproof cover (501).

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