Safety protection device for air tightness detection of hydrogen storage equipment

Abstract

The invention relates to a safety protection device for airtightness detection of hydrogen storage equipment, and belongs to the technical field of sealed container detection, the device comprises a protective cover and a hydrogen storage tank to be detected, the hydrogen storage tank is placed in the protective cover, and the airtightness of the tank body is detected by increasing the pressure intensity in the tank body and forming an air pressure difference with the pressure intensity in the protective cover. The air tightness detection unit comprises a transparent tube, a detection outer box body, a piston, a light source and a photosensitive element, whether the air tightness is intact or not is judged by detecting changes of light interference conditions, the device can effectively prevent operators from being hurt by hydrogen leakage in the detection process, meanwhile, the detection precision and efficiency are improved, and the protective cover comprises an upper cover and a lower cover. A complete sealed cavity is formed after splicing, a supporting seat and a sealing ring seat are arranged in the sealed cavity and used for supporting a hydrogen storage tank to be detected and separating a sealed area, through cooperative work of all the components, the device achieves efficient and accurate detection of the air tightness of the hydrogen storage equipment, and meanwhile the safety of the operation process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed container detection, and particularly relates to a safety protection device for airtightness detection of hydrogen storage equipment. Background Art

[0002] With the acceleration of the global energy transformation, hydrogen energy, as a clean and efficient renewable energy, has been continuously expanding its application scope. As a key link in the storage and transportation of hydrogen energy, the safety and reliability of hydrogen storage equipment are of crucial importance. The airtightness of hydrogen storage equipment is directly related to the storage safety and use efficiency of hydrogen. Once leakage occurs, it will not only lead to hydrogen loss but also may trigger serious safety accidents such as fires and explosions.

[0003] Traditional methods for detecting the airtightness of hydrogen storage equipment mainly rely on manual inspection and simple pressure tests. Manual inspection has problems such as strong subjectivity, low efficiency, and easy omission, making it difficult to meet the requirements for detecting large-scale hydrogen storage equipment. Although simple pressure tests can initially judge the tightness of the equipment, they have insufficient detection accuracy for minute leaks and leaks under specific conditions and cannot accurately determine the leakage location and degree.

[0004] In modern industrial production, for the airtightness detection of hydrogen storage equipment, not only high-precision detection means are required, but also the safety protection of operators needs to be considered. Especially during the detection process, how to prevent hydrogen leakage from harming operators and how to quickly and accurately locate the leakage point have become urgent problems to be solved. Summary of the Invention

[0005] In view of the above-mentioned defects and problems, the present invention aims to provide a safety protection device for airtightness detection of hydrogen storage equipment. Through innovative design and integration of advanced detection technologies, it realizes efficient and accurate detection of the airtightness of hydrogen storage equipment while ensuring the safety of the operation process.

[0006] The solution adopted by the present invention to solve its technical problems is as follows: A safety protection device for airtightness detection of hydrogen storage equipment includes a protective cover and a hydrogen storage tank to be detected. The hydrogen storage tank is placed inside the protective cover. On one side of the protective cover facing the air inlet of the hydrogen storage tank, there is a sealed pipeline. During detection, the sealed pipeline is hermetically connected to the air inlet of the hydrogen storage tank. The outer end of the sealed pipeline is connected to an air inlet pipe, and a valve I is arranged on the air inlet pipe. During the detection process, a detection gas is filled into the hydrogen storage tank to increase the pressure inside the tank and form an air pressure difference with the inside of the protective cover to detect the airtightness of the tank body. An airtightness detection unit is arranged on the sealed pipeline; The airtightness detection unit includes a transparent tube disposed on and communicating with the sealed pipeline. A detection outer box is provided outside the transparent tube. Both ends of the transparent tube penetrate through the detection outer box. A piston is fitted inside the transparent tube in a matching manner. An air pressure change space is formed between the piston, the transparent tube, and the sealed pipeline. A light source is provided on one side inside the detection outer box, and a photosensitive element is provided on the other side. When the light generated by the light source passes through the grating, light interference occurs. The interference imaging of the grating is displayed on the photosensitive element. By detecting the change in the light interference situation by the photosensitive element, it is determined whether the airtightness is intact.

[0007] Further, a ring cover is fixedly sleeved outside the transparent tube, and a grating is provided on the ring cover. When the internal air pressure of the hydrogen storage tank leaks and changes, the relative position between the ring cover and the piston changes, and the light interference situation of the two gratings also changes.

[0008] Further, a fixed ring sleeve is fixedly sleeved on the side of the transparent tube close to the sealed pipeline. Gratings are provided on both the piston and the fixed ring sleeve. When the internal air pressure of the hydrogen storage tank leaks and changes, the distance between the piston and the fixed ring sleeve changes, and the light interference situation of the two gratings also changes.

[0009] Further, an exhaust port extending outward is provided on the lower cover of the protective cover, and a second valve is installed on the exhaust port. The gas inside the protective cover is pumped out through the exhaust port to form a negative pressure state, increasing the pressure difference between the inside and outside of the hydrogen storage tank and enhancing the result display effect of the airtightness detection of the tank body.

[0010] Further, the protective cover includes an upper cover and a lower cover. After the upper cover and the lower cover are joined together, a complete sealed cavity is formed. A sealing gasket is provided at the joint of the upper cover and the lower cover to strengthen the sealing effect after the upper cover and the lower cover are joined together.

[0011] Further, a support seat for supporting the hydrogen storage tank to be tested is fixed inside the lower cover. After the hydrogen storage tank is placed on the support seat, its air inlet end faces the sealed pipeline.

[0012] Further, two or more groups of sealing ring seats are provided on the inner walls of the upper cover and the lower cover of the protective cover. After the upper cover and the lower cover are joined together, the sealing ring seats form a complete sealing ring plate. The inner diameter of the sealing ring plate is the same as the outer diameter of the hydrogen storage tank, dividing the inside of the protective cover into multiple independent sealed areas. Auxiliary pipelines are respectively connected to each sealed area on the protective cover, and valves are provided on the auxiliary pipelines. The ends of the three auxiliary pipelines are connected by confluence through the main pipeline. One end of the main pipeline is closed, and the other end is connected to an air pump.

[0013] Further, light-shielding plates are provided on both sides of the ring cover. The light-shielding plates divide the detection outer box into two spaces. One space is used to generate the light source, and the other space is used to install the photosensitive element.

[0014] Further, the light source uses a laser.

[0015] Advantages of the present invention: High-precision detection: An airtightness detection unit using the principle of optical interference shows the change in the position of the piston through the change in optical interference imaging, can accurately sense minute air pressure changes, thereby achieving high-precision detection of the airtightness of hydrogen storage equipment. By the real-time monitoring of the optical interference image by the photosensitive element, it can quickly determine whether there is leakage in the hydrogen storage tank, providing a precise and reliable detection and judgment scheme for the airtightness detection of hydrogen storage equipment; Safety protection guarantee: The design of the protective cover can effectively prevent the harm caused to the operator by hydrogen leakage during the detection process. During the detection process, even if the hydrogen storage tank ruptures or explodes, the protective cover can provide a certain degree of shielding and protection to ensure the safety of the operator; and by adjusting the air pressure inside the protective cover, it can also cooperate with the detection of the airtightness of the hydrogen storage tank to improve the detection efficiency and effect; Leak point positioning function: By setting multiple independent sealed areas in the protective cover and connecting the corresponding auxiliary pipelines and valves, independent detection of different parts of the hydrogen storage tank is achieved. Once leakage is detected, the position of the leak point can be quickly determined by detecting the air pressure change in each area one by one, facilitating subsequent maintenance and handling; Strong adaptability: The device has a compact structure, is convenient for movement and installation, and is applicable to various hydrogen storage equipment with different specifications and types. Whether it is a large fixed hydrogen storage tank or a small mobile hydrogen storage container, effective airtightness detection can be carried out; Simple operation: It has a high degree of automation and the detection process is simple and fast. The operator only needs to place the hydrogen storage tank in the protective cover, connect the sealed pipeline and the intake pipe, and start the air pump and the detection system, then the entire detection process can be automatically completed, greatly improving the work efficiency. Brief description of the drawings

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the split structural schematic diagram of the protective cover of the present invention; Figure 3 is the front view sectional structural schematic diagram of the present invention; Figure 4 is one of the structural schematic diagrams of the airtightness detection unit of the present invention; Figure 5 is the side view sectional structural schematic diagram of the present invention; Figure 6 is the other structural schematic diagram of the airtightness detection unit of the present invention; Figure 7 is Figure 3 the enlarged structural schematic diagram at A in Figure 8 is the structural schematic diagram of the fourth embodiment of the present invention.

[0017] In the figure: 1. Protective cover; 101. Upper cover; 102. Lower cover; 103. Gasket; 2. Hydrogen storage tank; 3. Sealed pipeline; 4. Inlet pipe; 5. Valve 1; 6. Exhaust port; 7. Valve 2; 8. Detection outer box; 9. Transparent pipe; 10. Piston; 11. Ring cover; 12. Light-shielding plate; 13. Photosensitive element; 14. Light source; 15. Fixed ring sleeve; 16. Support seat; 17. Sealing ring seat; 18. Main pipeline; 19. Auxiliary pipeline. Specific implementation mode

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Please refer to Figure 1-8 For the technical solution of , aiming at the problems of insufficient accuracy, low safety, complex operation, etc. existing in the traditional airtightness detection method of hydrogen storage equipment, the present invention provides a safety protection device for airtightness detection of hydrogen storage equipment, and proposes an efficient, accurate and safe detection scheme. The device includes key components such as a protective cover, a sealed pipeline, an airtightness detection unit, etc. By filling the hydrogen storage tank with inert gas and using the principle of optical interference to detect the air pressure change, the accurate judgment of the airtightness of the hydrogen storage tank is realized. At the same time, the design of the protective cover effectively prevents hydrogen leakage and ensures the safety of operators. Embodiment

[0020] According to Figure 1 and Figure 2 As shown, a safety protection device for airtightness detection of hydrogen storage equipment includes a protective cover 1 and a hydrogen storage tank 2 to be detected. The hydrogen storage tank 2 is placed in the protective cover 1 during detection, and airtightness detection is realized inside the protective cover 1. And the protective cover 1 is wrapped outside the hydrogen storage tank 2. In case the tank body ruptures or explodes during detection, the protective cover 1 can provide shielding protection. One side of the protective cover 1 is provided with a sealed pipeline 3. When the hydrogen storage tank 2 is placed inside the protective cover 1, the direction of the air inlet of the tank body faces the sealed pipeline 3, and the sealed pipeline 3 and the air inlet end of the hydrogen storage tank 2 are sealed and connected by a flange, so that the sealed pipeline 3 and the hydrogen storage tank 2 are sealed and communicated. An inlet pipe 4 is connected to one end of the sealed pipeline 3 located outside the protective cover 1, and a valve 1 5 is arranged on the inlet pipe 4. During the detection process, an air pump fills the hydrogen storage tank 2 with detection gas through the inlet pipe 4 to increase the pressure inside the tank body to detect the airtightness of the tank body. The gas filled is preferably an inert gas, such as helium. Helium has good chemical stability and can improve the safety during detection. An airtightness detection unit is arranged on the sealed pipeline 3. The airtightness detection unit is located outside the protective cover 1 and is connected to the detection cabinet for detecting and displaying the airtightness of the hydrogen storage tank 2.

[0021] As Figure 2As shown in the figure, the protective cover 1 includes an upper cover 101 and a lower cover 102. After the upper cover 101 and the lower cover 102 are joined and locked, a complete sealed cavity is formed. A sealing gasket 103 is provided at the joint of the upper cover 101 and the lower cover 102 to enhance the sealing effect after the upper cover 101 and the lower cover 102 are joined and prevent the protective cover 1 from leaking air. A support seat 16 for supporting the hydrogen storage tank 2 to be tested is fixed inside the lower cover 102. After the hydrogen storage tank 2 is placed on the support seat 16, the intake port end thereof faces the sealing pipeline 3.

[0022] The specific structure of the airtightness detection unit is as Figure 2-5 shown, and it includes a transparent tube 9 provided on and communicating with the sealing pipeline 3. A detection outer box 8 is fixed outside the transparent tube 9. Both ends of the transparent tube 9 penetrate through the detection outer box 8. A piston 10 is fitted inside the transparent tube 9 in a matching manner. A sealed air pressure change space is formed between one side of the piston 10 and the transparent tube 9 and the sealing pipeline 3. A breathing hole is provided at one end of the transparent tube 9 away from the sealing pipeline 3. When detecting the airtightness of the hydrogen storage tank 2, the gas pumped into the tank by the air pump through the intake pipe 4 makes the pressure inside the tank positive. At the same time, the piston 10 moves upward inside the transparent tube 9. After the gas is no longer pumped into the tank and the air pressure is stable, the position of the piston 10 inside the transparent tube 9 is determined. Then, the hydrogen storage tank 2 is left static, and the airtightness of the tank body is detected through the air pressure. If the tank body is airtight and does not leak, the gas inside the tank will not escape, the air pressure remains constant, and at the same time, the position of the piston 10 does not change either. If the tank body leaks, the high-pressure gas inside the tank will escape outward, the air pressure decreases, and at the same time, the piston 10 will also move downward and its position changes. By observing the position change of the piston 10, the airtightness of the hydrogen storage tank 2 can be judged. Moreover, the air pressure change of the relatively large hydrogen storage tank 2 is manifested through the relatively thin and small transparent tube 9 and the piston 10, which can magnify the air pressure change situation, thus facilitating the judgment of whether the airtightness of the tank body is good.

[0023] A ring cover 11 is fixedly sleeved around the transparent tube 9. The ring cover 11 is located inside the detection outer box 8. If the tank body leaks, the piston 10 will displace relative to the ring cover 11. Both the piston 10 and the ring cover 11 are made of materials with dark colors that are not light-transmitting. A plurality of light-transmitting ports are arranged in a row and penetrated through the piston 10 and the ring cover 11 to form a grating. A light source 14 is provided on one side inside the detection outer box 8, preferably a laser. The wavelength of the laser is short, and the change between the wave crest and the wave trough will form interference with high precision. A photosensitive element 13 is provided on the other side. The photosensitive element 13 is connected to an external detection cabinet and is used to detect the imaging situation on the photosensitive element 13. When the light generated by the light source 14 passes through the grating of the ring cover 11 and the piston 10, light interference will occur, and the interference imaging of the grating is displayed on the photosensitive element 13. If the position of the piston 10 changes, the light interference situation will also change. By detecting the light interference situation between the piston 10 and the ring cover 11 through the photosensitive element 13, it can be determined whether the airtightness is intact.

[0024] To improve the light transmission effect of the grating, light-shielding plates 12 are provided on both sides of the ring cover 11. The light-shielding plates 12 divide the detection outer box body 8 into two spaces. One space is used to generate the light source 14, and the other space is used to receive the light interference light transmission image of the grating. The light transmission ports can also be set with different spacings to further improve the variation effect of the amplified light interference.

[0025] If there is air leakage due to poor airtightness of the tank body, the position of the piston 10 will change, the relative position of the two gratings will change, and the light interference image generated on the photosensitive element 13 will also change. The airtightness of the hydrogen storage tank 2 can be judged by the change of the image of the photosensitive element 13. By using the above method, the position movement of the piston 10 and the airtightness of the hydrogen storage tank 2 are detected and judged through the light interference imaging of the grating, and even a slight change in air pressure can be displayed, thereby improving the detection accuracy and accuracy.

[0026] During specific use, for a safety protection device for detecting the airtightness of a hydrogen storage device according to the present invention, first, the hydrogen storage tank 2 to be detected is placed on the support seat 16 of the lower cover 102, and the sealing pipeline 3 and the air inlet of the hydrogen storage tank 2 are hermetically connected through a flange. Then, the upper cover 101 and the lower cover 102 are closed, and a sealed space is formed inside the protective cover 1. Then, helium is filled into the hydrogen storage tank 2 through the air pump and the air inlet pipe 4 to increase the air pressure inside the tank. When the tank is filled with gas and the internal air pressure is stable, record the position of the piston 10 at this time, and the light interference situation formed on the photosensitive element 13 when the light of the light source 14 passes through the gratings on the piston 10 and the ring cover 11. Then, stand for a period of time and observe the light interference situation. If the light interference imaging changes, it can be judged that the position of the piston 10 has changed, that is, the air pressure inside the hydrogen storage tank 2 has changed, and the hydrogen storage tank 2 has air leakage. If the light interference imaging does not change, it can be judged that the airtightness of the hydrogen storage tank 2 is intact. Embodiment

[0027] On the basis of Embodiment 1, the same parts of this embodiment and Embodiment 1 will not be described again. The differences are as follows: As Figure 1 and Figure 2 shown, an exhaust port 6 extending outward is provided on the lower cover 102 of the protective cover 1, and a second valve 7 is installed on the exhaust port 6. When the detection gas is filled into the hydrogen storage tank 2 and the air pressure tends to be stable and the air pressure is P1, the air pump can be used to pump the gas inside the protective cover 1 outwards through the exhaust port 6 until it is in a negative pressure state to a vacuum state. At this time, a air pressure P2 is formed inside the protective cover 1, the air pressure inside the hydrogen storage tank 2 is P1, and because P2 is negative pressure and P1 is positive pressure, and P2 is much smaller than P1, the pressure difference between the inside and outside of the hydrogen storage tank 2 can be increased. If the hydrogen storage tank 2 leaks, the air pressure fluctuation inside the tank will be more obvious, thereby increasing the display effect of the detection result of the airtightness of the tank body. Embodiment

[0028] Based on Embodiment 1, the same parts as those in Embodiment 1 will not be described again, and the differences are as follows: In addition to the technical solution of the optical interference imaging of the piston 10 and the ring cover 11 provided in Embodiment 1, this embodiment further proposes a different structure of the airtightness detection unit.

[0029] As Figure 6 shown, a piston 10 is movably sleeved in a transparent tube 9. A fixed ring sleeve 15 is fixedly sleeved on one side of the transparent tube 9 close to the sealing pipeline 3. Gratings are provided on both the piston 10 and the fixed ring sleeve 15. A laser light source 14 is provided on one side of the detection outer box 8, and a photosensitive element 13 is provided on the other side. After the air pressure in the hydrogen storage tank 2 is stable after inflation, the position of the piston 10 is also determined, and the distance between the piston 10 and the fixed ring sleeve 15 is also determined. At this time, the optical interference imaging of the gratings on the piston 10 and the fixed ring sleeve 15 is determined. If the tank leaks, the position of the piston 10 changes, and the distance between the piston 10 and the fixed ring sleeve 15 also changes, so that the optical interference imaging also changes, thereby judging whether the hydrogen storage tank 2 leaks; moreover, the position of the fixed ring sleeve 15 is fixed, which can also limit the moving range of the piston 10 and prevent the piston 10 from being disengaged from the transparent tube 9 due to excessive air pressure changes. Embodiment

[0030] If it is detected that the hydrogen storage tank leaks, it is necessary to further judge and determine the leakage position. Based on the above embodiment, this embodiment proposes a structure and method for judging the leakage position of the tank body.

[0031] As Figure 8 shown, in this embodiment, the support seat 16 in the protective cover 1 is replaced with a sealing ring seat 17. More than two sealing ring seats 17 are provided on the inner walls of the upper cover 101 and the lower cover 102. After the upper cover 101 and the lower cover 102 are joined together, the sealing ring seats 17 form a complete sealing ring plate, and the inner diameter of the sealing ring plate is the same as the outer diameter of the hydrogen storage tank 2, which can divide the interior of the protective cover 1 into multiple independent sealed areas. Here, two groups of sealing ring seats 17 are taken as an example. The sealing ring plate formed by joining the two groups of sealing ring seats 17 divides the interior of the protective cover 1 into three independent areas a, b, and c. According to conventional experience, the leakage position is generally at the welding joints at the top and bottom of the tank body and the pipeline connection joints. Therefore, when the hydrogen storage tank is placed in the protective cover 1, the top, bottom, and middle parts of the tank body are respectively in three independent areas and are separated. Auxiliary pipelines 19 are respectively connected to the three independent areas a, b, and c on the protective cover 1. A valve two 7 is provided on the auxiliary pipeline 19. The ends of the three auxiliary pipelines 19 are connected by confluence through a main pipeline 18. One end of the main pipeline 18 is closed, and the other end is connected to an air pump.

[0032] When determining the air leakage position of the hydrogen storage tank 2, the valves on one auxiliary pipeline can be sequentially opened, and the valves on the other two auxiliary pipelines 19 are closed. Taking area a as an example, the valve of the auxiliary pipeline corresponding to area a is opened, and the valves of areas b and c are closed. Then, the negative pressure in area a is evacuated through the main pipeline 18 and the air pump. The air pressures in areas b and c inside the protective cover 1 and inside the hydrogen storage tank 2 are equal and in the normal pressure state, and there will be no pressure difference change; the a area of the protective cover 1 is in a negative pressure vacuum state, and the inside of the hydrogen storage tank 2 is in the normal pressure state. If there is air leakage at the inlet or the welded joint at the top of the hydrogen storage tank 2, the gas inside the hydrogen storage tank 2 will leak into area a, and the air pressure in the tank will change. It is detected and judged by the airtightness detection unit that the part of the tank body in area a has air leakage; By detecting areas a, b, and c in the above manner in sequence, the range for determining the air leakage of the hydrogen storage tank 2 can be narrowed down to assist the staff in finding and determining the air leakage position of the hydrogen storage tank 2.

[0033] The above are only the preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety protection device for airtightness detection of a hydrogen storage device, comprising a protective cover (1) and a hydrogen storage tank (2) to be detected, the hydrogen storage tank (2) is placed inside the protective cover (1), and is characterized in that, One side of the protective cover (1) facing the air inlet of the hydrogen storage tank (2) is provided with a sealing pipeline (3). During detection, the sealing pipeline (3) is sealingly connected to the air inlet of the hydrogen storage tank (2). The outer end of the sealing pipeline (3) is connected with an air inlet pipe (4). A first valve (5) is arranged on the air inlet pipe (4). During the detection process, a detection gas is filled into the hydrogen storage tank (2) to increase the pressure inside the tank and form an air pressure difference with the inside of the protective cover, so as to detect the air tightness of the tank body. An air tightness detection unit is arranged on the sealing pipeline (3). The air tightness detection unit includes a transparent pipe (9) arranged on and communicated with the sealing pipeline (3). The outside of the transparent pipe (9) is provided with a detection outer box body (8). Both ends of the transparent pipe (9) penetrate through the detection outer box body (8). A piston (10) is fitted inside the transparent pipe (9). An air pressure change space is formed between the piston and the transparent pipe (9) and the sealing pipeline (3). A light source (14) is arranged on one side inside the detection outer box body (8), and a photosensitive element (13) is arranged on the other side. When the light generated by the light source (14) passes through the grating, light interference occurs. The interference imaging of the grating is displayed on the photosensitive element (13). The air tightness is judged to be intact by detecting the change of the light interference condition through the photosensitive element (13).

2. The airtightness detection safety protection device for a hydrogen storage device according to claim 1, characterized in that, A ring cover (11) is fixedly sleeved outside the transparent pipe (9). A grating is arranged on the ring cover (11). When the internal air pressure of the hydrogen storage tank (2) leaks and changes, the relative positions of the ring cover (11) and the piston (10) change, and the light interference conditions of the two gratings also change.

3. The airtightness detection safety protection device for a hydrogen storage device according to claim 1, wherein A fixed ring sleeve (15) is fixedly sleeved on the side of the transparent pipe (9) close to the sealing pipeline (3). Gratings are arranged on both the piston (10) and the fixed ring sleeve (15). When the internal air pressure of the hydrogen storage tank (2) leaks and changes, the distance between the piston (10) and the fixed ring sleeve (15) changes, and the light interference conditions of the two gratings also change.

4. A safety protection device for airtightness detection of a hydrogen storage device according to claim 1, characterized in that, An exhaust port (6) extending outwards is arranged on the lower cover (102) of the protective cover (1). A second valve (7) is installed on the exhaust port (6). The gas inside the protective cover (1) is pumped out through the exhaust port (6) to form a negative pressure state, increasing the pressure difference between the inside and outside of the hydrogen storage tank (2) and enhancing the display effect of the detection result of the air tightness of the tank body.

5. The safety protection device for airtightness detection of a hydrogen storage device according to claim 1, characterized in that, The protective cover (1) includes an upper cover (101) and a lower cover (102). After the upper cover (101) and the lower cover (102) are joined together, a complete sealed cavity is formed. A sealing gasket (103) is arranged at the joint of the upper cover (101) and the lower cover (102) to strengthen the sealing effect after the upper cover (101) and the lower cover (102) are joined together.

6. The airtightness detection safety protection device for a hydrogen storage device according to claim 5, characterized in that, A support seat (16) for supporting the hydrogen storage tank (2) to be tested is fixed inside the lower cover (102). After the hydrogen storage tank (2) is placed on the support seat (16), its air inlet is directly opposite to the sealing pipeline (3).

7. A safety protection device for detecting the airtightness of a hydrogen storage device according to claim 2 or 3, characterized in that, On the inner walls of the upper cover (101) and the lower cover (102) of the protective cover (1), there are two or more groups of sealing ring seats (17). After the upper cover (101) and the lower cover (102) are joined together, the sealing ring seats (17) form a complete sealing ring plate. The inner diameter of the sealing ring plate is the same as the outer diameter of the hydrogen storage tank (2), dividing the inside of the protective cover (1) into multiple independent sealed areas. On each sealed area of the protective cover (1), an auxiliary pipeline (19) is connected respectively. A valve is provided on the auxiliary pipeline (19). The ends of the three auxiliary pipelines (19) are connected by confluence through the main pipeline (18). One end of the main pipeline (18) is closed, and the other end is connected to an air pump.

8. The airtightness detection safety protection device for a hydrogen storage device according to claim 2, characterized in that, On both sides of the ring cover (11), there are light-shielding plates (12). The light-shielding plates (12) divide the detection outer box body (8) into two spaces. One space is used to generate a light source (14), and the other space is used to install a photosensitive element (13).

9. The airtightness detection safety protection device for a hydrogen storage device according to claim 1, characterized in that, The light source (14) uses a laser.

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