Leakage plugging device for hydrogen conveying pipeline

Abstract

The invention discloses a leakage plugging device for a hydrogen conveying pipeline, which relates to the technical field of hydrogen conveying and comprises a first fastener matched with the outer wall of the pipeline; the second buckling piece is matched with the first buckling piece to be arranged on the outer side of the pipeline in a sleeving mode and used for blocking the leakage position of the pipeline; the jacking piece is installed in the first buckling piece, and the first buckling piece is filled with leaked hydrogen so that the jacking piece can be pushed to be in linkage; the air bag is installed on one side of the first buckling piece, the air bag is in linkage with the jacking piece, and inert gas is stored in the air bag; after the first buckling piece and the second buckling piece are arranged on the outer wall of the pipeline in a sleeving mode, high-pressure hydrogen pushes the jacking piece to move, and then inert gas in the air bag is exhausted to dilute leaked hydrogen.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen transportation, and in particular to a leakage blocking device for a hydrogen transportation pipeline. Background Art

[0002] As the global energy structure shifts towards cleaner and lower-carbon energy, hydrogen, as an efficient, zero-carbon secondary energy source, is becoming increasingly common in fuel cells, chemical synthesis, metallurgical reduction, and energy storage. Safe and efficient transportation technology is crucial for the large-scale commercialization of hydrogen. Compared with traditional methods such as high-pressure gaseous storage and transportation and liquid hydrogen tankers, pipeline transportation is considered a core component of hydrogen energy infrastructure due to its advantages such as strong continuity, low cost, and suitability for long-distance, high-capacity transmission. However, the unique physical and chemical properties of hydrogen (such as its small molecular weight, high diffusion coefficient, and flammability and explosiveness) pose severe challenges to the sealing and material compatibility of pipeline systems. The risk of leakage has become one of the main technical bottlenecks restricting the large-scale development of hydrogen pipeline networks.

[0003] Currently, the sealing technologies for hydrogen pipeline leaks mainly include three categories: mechanical sealing, chemical sealing and cryogenic freezing. Mechanical sealing technologies, such as the use of clamps or expansion plugs, rely on external devices to apply physical pressure to the leak point to achieve a sealing effect. However, since hydrogen pipelines are usually subjected to high pressure, this makes the clamps easy to slip. In addition, standard clamps are difficult to adapt to irregular leaks, such as cracks or holes, resulting in insufficient sealing reliability. At the same time, during the sealing process, the compression of the hydrogen flow channel will cause the hydrogen concentration to rise, thereby increasing the risk of hydrogen explosion. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing technology easily causes an increase in hydrogen concentration when blocking hydrogen pipelines.

[0005] The above technical problem is solved by the following technical solution: The present invention provides a hydrogen transmission pipeline leakage plugging device, which includes a first fastening member adapted to the outer wall of the pipeline; A second fastening member, which cooperates with the first fastening member and is sleeved on the outside of the pipeline to seal the leaking part of the pipeline; A lifting member installed inside the first fastening member; an airbag, mounted on one side of the first fastening member, the airbag being linked to the lifting member, and containing an inert gas; The first fastener and the second fastener are installed at the leaking part of the pipeline. The leaked hydrogen is filled inside the first fastener and the second fastener, which can drive the lifting part to work in conjunction. The lifting part drives the inert gas inside the airbag to be discharged to dilute the concentration of the leaked hydrogen.

[0006] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention: a sealing gasket is provided inside the first fastening member and the second fastening member; The first fastening member includes a main pipeline, a branch pipeline provided on a side wall of the main pipeline, and a return pipeline connecting the main pipeline with the branch pipeline; The sealing gasket is closely attached to the outer wall of the pipeline and can limit the flow of hydrogen along the inner wall of the main pipeline.

[0007] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention: the lifting member includes a first gasket, and the first gasket is installed inside the main pipeline; The first washer is provided with a limiting sleeve in parallel with the first washer; A first sealing head is provided between the limiting sleeve and the first gasket; The first plugging head includes a support rod and a first restoring member covering the outside of the support rod; The first restoring member releases elastic potential energy, thereby driving the end face of the first plugging head to be tightly attached to the first gasket.

[0008] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention: the limiting sleeve includes a through groove, and the through groove is provided at the axial center position of the limiting sleeve; The through groove is adapted to the support rod; the through groove cooperates with the support rod to ensure that the first plugging head moves along the main pipe in a direction that is not parallel to the pipeline axis.

[0009] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention: a push rod perpendicular to the movement direction of the first plugging head is provided on the inner side of the support rod; The push rod includes a connecting portion and a sealing portion provided on the outer wall of the connecting portion and in close contact with the inner wall of the branch pipe; the sealing portion is in close contact with the inner wall of the branch pipe; The side wall of the support rod is provided with an oblique hole; The side wall of the connecting portion is provided with a guide column, and the guide column is adapted to the inclined hole.

[0010] In a preferred embodiment of the hydrogen delivery pipeline leakage plugging device of the present invention: the airbag includes a connecting pipe for connecting to the main pipeline; A second plugging head is provided inside the connecting pipe for plugging the outlet of the connecting pipe; A second resetting member is provided on the outer side of the second plugging head; The end of the connecting portion away from the supporting rod contacts the second blocking head.

[0011] In a preferred embodiment of the hydrogen delivery pipeline leakage plugging device of the present invention: a circular ring gasket is provided inside the branch pipeline; There are two groups of annular gaskets, and the two groups of annular gaskets are spaced apart along the axis of the branch pipe; The connection point between the return pipeline and the branch pipeline is located between the two groups of annular pads; A one-way valve is installed inside the return pipeline, and the flow direction of the one-way valve is from the branch pipeline to the main pipeline.

[0012] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention: the movement of the connecting portion synchronously drives the movement of the second plugging head, thereby realizing the opening of the connecting pipe passage; The inert gas stored in the airbag enters the main pipeline through the reflux pipeline to dilute the concentration of the leaked hydrogen.

[0013] In a preferred embodiment of the hydrogen transmission pipeline leakage plugging device of the present invention, a ball valve is installed at the top of the main pipeline.

[0014] The beneficial effects of the present invention are: the sealing device can ensure that the leaking pipeline is sealed under pressure, and the inert gas stored inside the airbag can dilute the concentration of hydrogen to ensure the concentration of hydrogen and avoid explosions caused by excessive hydrogen concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention, and are not intended to limit the present invention.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a hydrogen transmission pipeline leakage plugging device is shown; Figure 2 A top view of a hydrogen transmission pipeline leakage plugging device is shown; Figure 3 Shown Figure 2 Sectional view at AA; Figure 4 Shown Figure 3 A partial enlarged view of point B; Figure 5 A schematic diagram showing a connection state of the first fastening member and the second fastening member is shown; Figure 6 A schematic diagram of the exploded structure of the lifting part is shown.

[0017] In the figure: 11. First fastening part; 111. Main pipeline; 112. Branch pipeline; 1121. Circular gasket; 113. Return pipeline; 12. Second fastening part; 13. Sealing gasket; 2. Lifting part; 21. First gasket; 22. Limiting sleeve; 221. Through groove; 23. First plugging head; 231. Support rod; 2311. Oblique hole; 232. First reset part; 24. Push rod; 241. Connecting part; 2411. Guide column; 242. Sealing part; 3. Airbag; 31. Connecting pipe; 32. Second plugging head; 33. Second reset part; 4. Ball valve. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0019] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0020] Reference Figure 1-Figure 3 This embodiment provides a hydrogen transmission pipeline leakage plugging device, including a first fastening member 11, which is adapted to the outer wall of the pipeline; a second fastening member 12, which is matched with the first fastening member 11 and is sleeved on the outside of the pipeline to plug the leakage of the pipeline; the first fastening member 11 and the second fastening member 12 can be assembled and used by bolt connection. Both ends of the first fastening member 11 and the second fastening member 12 are connected by bolts, so as to better facilitate the storage of the staff. When the device is needed, it only needs to be assembled with bolts.

[0021] The lifting member 2 is installed inside the first fastening member 11. The leaked hydrogen filled inside the first fastening member 11 can push the lifting member 2 to move; when the first fastening member 11 and the second fastening member 12 are assembled and installed at the leakage position of the hydrogen pipeline, the first fastening member 11 and the second fastening member 12 are close to the inner wall of the pipeline, so that a chamber is formed inside the first fastening member 11 and the second fastening member 12, causing the leaked hydrogen to be concentrated inside the chamber, thereby increasing the hydrogen pressure inside the chamber; the high-pressure hydrogen can push the lifting member 2 to move, so that the hydrogen flows along the channel connected by the first fastening member 11.

[0022] The airbag 3 is installed on one side of the first fastening part 11. The airbag 3 is linked to the lifting part 2. Inert gas is stored inside the airbag 3. The airbag 3 includes an injection pipe and a discharge pipe. When the airbag 3 is filled with inert gas, the injection channel opens, allowing the inert gas to enter the airbag 3.

[0023] Under normal circumstances, the injection pipe and the discharge pipe of the airbag 3 are both in a closed state. When the inside of the airbag 3 is filled with inert gas and reaches a certain pressure, the injection pipe and the discharge pipe will be closed more tightly; at this time, the force required to open the injection pipe and the discharge pipe is greater than that under normal circumstances; it should be noted that after the inside of the airbag 3 is filled with inert gas, the internal pressure of the airbag 3 increases, which will cause the injection pipe and the discharge pipe to be sealed more tightly, thereby ensuring that the inert gas can be stored in the airbag 3 for a long time.

[0024] Furthermore, after the first fastener 11 and the second fastener 12 are sleeved on the outer wall of the pipe, the high-pressure hydrogen pushes the lifting member 2 to move, thereby discharging the inert gas inside the airbag 3 to dilute the leaked hydrogen concentration, thereby effectively avoiding explosion caused by excessive hydrogen concentration.

[0025] By cooperating between the first fastener 11 and the second fastener 12, a closed cavity can be formed at the leaking part of the pipeline, so that the leaked hydrogen is stored inside the cavity; after the hydrogen enters the cavity, it can be discharged to the outside through the pipeline connected to the inner wall of the first fastener 11.

[0026] During use, the first fastener 11 and the second fastener 12 are fixed to the outer wall of the hydrogen pipeline, and then the first fastener 11 and the second fastener 12 are pressed against the outer wall of the pipeline. The first fastener 11 and the second fastener 12 are pressed against the pipeline and form a closed cavity. The leaked hydrogen gathers inside the cavity and escapes into the air through the main pipeline 111 connected to the inner wall of the first fastener 11; under normal circumstances, the lifting member 2 blocks the channel inside the main pipeline 111; hydrogen gathers inside the cavity and forms a certain pressure, which can push the lifting member 2 to move, thereby making the internal pipeline of the main pipeline 111 unobstructed; during the movement of the lifting member 2, the gas outlet inside the airbag 3 is pushed to be in an unobstructed state, so that the inert gas can enter the main pipeline 111 to dilute the concentration of the leaked hydrogen.

[0027] Reference Figure 5 and Figure 6As an optional embodiment, a sealing gasket 13 is provided inside the first fastening member 11 and the second fastening member 12; the first fastening member 11 includes a main line 111, a branch line 112 provided on the side wall of the main line 111, and a return line 113 connecting the main line 111 and the branch line 112; the sealing gasket 13 is tightly attached to the outer wall of the pipeline and can limit the flow of hydrogen along the inner wall of the main line 111, and the main line 111 passes through the side wall of the first fastening member 11.

[0028] In this embodiment, one end of the first fastening member 11 and the second fastening member 12 are hinged, and the other end is fixed by a bolt connection; a sealing gasket 13 is provided inside the first fastening member 11 and the second fastening member 12, and the sealing gasket 13 is preferably made of fluororubber. The sealing gasket 13 is connected to the first fastening member 11 by a fixed connection, and the sealing gasket 13 is also connected to the second fastening member 12 by a fixed connection.

[0029] When the first fastener 11 and the second fastener 12 are installed on the outer wall of the pipe, the sealing gasket 13 is used to stick to the outer wall of the pipe, so as to ensure the airtightness of the connection between the first fastener 11, the second fastener 12 and the pipe. When the first fastener 11 cooperates with the second fastener 12 to stick to the outer wall of the pipe, a cavity can be formed, and the interior of the cavity is used to store leaked hydrogen.

[0030] Furthermore, the inner wall of the first fastener 11 is connected to a main line 111 , and the main line 111 is in communication with the interior of the cavity; when hydrogen leaks from the interior of the pipe, it will gather inside the cavity and be discharged outside the cavity through the main line 111 .

[0031] A branch line 112 is provided on the side wall of the main line 111, and the branch line 112 and the main line 111 are connected; one end of the return line 113 is connected to the outer wall of the branch line 112, and the end of the return line 113 away from the branch line 112 is connected to the main line 111, and the connection position between the return line 113 and the main line 111 is staggered from the connection position between the branch line 112 and the main line 111.

[0032] Furthermore, the lifting member 2 includes a first washer 21 , which is installed inside the main pipe 111 ; a limiting sleeve 22 is provided relatively parallel to the first washer 21 .

[0033] The first gasket 21 and the limiting sleeve 22 are arranged inside the main conduit 111 along the axial direction of the main conduit 111, and the position of the first gasket 21 relative to the limiting sleeve 22 is close to the second fastening member 12 and is located at the bottom of the main conduit 111, and the position of the limiting sleeve 22 relative to the first gasket 21 is away from the second fastening member 12 and is located at the top of the main conduit 111.

[0034] The first plugging head 23 is arranged between the first gasket 21 and the limiting sleeve 22, and the bottom of the first plugging head 23 is conical. When the outer wall of the first plugging head 23 is tightly attached to the inner wall of the first gasket 21, the internal passage of the main pipeline 111 can be blocked.

[0035] A first plugging head 23 is arranged between the limiting sleeve 22 and the first gasket 21; the first plugging head 23 includes a support rod 231 and a first reset member 232 covered on the outside of the support rod 231; the first reset member 232 releases elastic potential energy, thereby making the end face of the first plugging head 23 close to the first gasket 21.

[0036] The first return member 232 is preferably a spring, one end of the first return member 232 is connected to the end of the first plugging head 23 away from the first gasket 21, and the end of the first return member 232 away from the first plugging head 23 is in conflict with the limit sleeve 22; under normal circumstances, the first return member 232 releases elastic potential energy to push the outer wall of the first plugging head 23 to conflict with the inner wall of the limit sleeve 22, thereby achieving the blocking of the main pipeline 111.

[0037] Reference Figures 1-6 In an embodiment provided by the present invention, it includes a limit sleeve 22, including a through groove 221, and the through groove 221 is located in the center of the limit sleeve 22; the through groove 221 is adapted to the support rod 231; the through groove 221 cooperates with the support rod 231 to ensure that the first plugging head 23 moves along the axial direction of the main line 111, and the axial direction of the main line 111 is not parallel to the pipeline axis.

[0038] It should be noted that a rectangular groove that is compatible with the support rod 231 is opened in the center position of the limit sleeve 22, and the limit sleeve 22 and the first gasket 21 are fixed in fixed positions inside the main pipe 111; through the cooperation between the support rod 231 and the through groove 221, the movement direction of the support rod 231 can be effectively limited, thereby ensuring that the support rod 231 moves along the vertical direction with the first plugging head 23.

[0039] Furthermore, a push rod 24 is provided on the inner side of the support rod 231 and is perpendicular to the movement direction of the first plugging head 23; the push rod 24 includes a connecting portion 241 and a sealing portion 242 provided on the outer wall of the connecting portion 241; the sealing portion 242 is tightly attached to the inner wall of the branch pipeline 112; an inclined hole 2311 is provided on the side wall of the support rod 231; a guide column 2411 is provided on the side wall of the connecting portion 241, and the guide column 2411 is adapted to the inclined hole 2311.

[0040] The cross section of the support rod 231 is a concave structure, and two sets of opposite side walls of the support rod 231 are provided with oblique holes 2311 ; the tracks of the oblique holes 2311 intersect with the axis of the support rod 231 .

[0041] The push rod 24 includes a connecting portion 241, and one end of the connecting portion 241 is provided with a guide column 2411, which is covered by the support rod 231; the side wall of the connecting portion 241 is provided with a guide column 2411 in a direction perpendicular to the axis of the connecting portion 241, and the guide column 2411 is adapted to the inclined hole 2311; the guide column 2411 passes through the inclined hole 2311 and extends to the inside of the inclined hole 2311; the support rod 231 moves along the vertical direction, and the inner wall of the inclined hole 2311 squeezes the side wall of the guide column 2411, thereby pushing the movement trajectory of the guide column 2411 perpendicular to the moving direction of the support rod 231.

[0042] It should be noted that the sealing part 242 is preferably made of rubber, and the outer wall of the sealing part 242 conflicts with the inner wall of the branch line 112. Through the cooperation between the sealing part 242 and the branch line 112, the passage of the branch line 112 can be blocked, thereby ensuring that hydrogen will not be discharged from the cavity through the branch line 112.

[0043] Furthermore, the airbag 3 includes a connecting tube 31 connected to the main line 111; a second plugging head 32 for sealing the outlet of the connecting tube 31 is provided inside the connecting tube 31; a second reset member 33 is provided on the outside of the second plugging head 32; the end of the connecting part 241 away from the support rod 231 conflicts with the second plugging head 32.

[0044] In this embodiment, the connecting tube 31 is connected to the branch pipe 112, and two groups of annular gaskets are provided inside the connecting tube 31, and the end of the second plugging head 32 cooperates with the gasket close to the side of the branch pipe 112 so as to block the internal channel of the connecting tube 31; and a second reset member 33 is provided on the outside of the second plugging head 32; one end of the second reset member 33 conflicts with the end of the second plugging head 32, and the end of the second reset member 33 away from the second plugging head 32 conflicts with a group of gaskets away from the branch pipe 112; under normal circumstances, the second reset member 33 releases elastic potential energy to push the second plugging head 32 to contact with a group of gaskets close to the branch pipe 112, thereby achieving sealing of the airbag 3.

[0045] It should be noted that the end of the connecting portion 241 away from the first plugging head 23 conflicts with the second plugging head 32; then, when the connecting portion 241 moves horizontally toward the side close to the airbag 3, the connecting portion 241 will push the second plugging head 32 to move, thereby opening the channel inside the connecting pipe 31; at this time, the inert gas inside the airbag 3 enters the branch pipe 112 along the connecting pipe 31, and since the sealing portion 242 fits the inner wall of the branch pipe 112; hydrogen can only enter the main pipe 111 through the reflux pipe 113; after the inert gas is mixed with the hydrogen inside the main pipe 111, the hydrogen concentration can be effectively reduced, thereby avoiding explosion caused by excessive hydrogen concentration.

[0046] Furthermore, an annular gasket 1121 is provided inside the branch pipeline 112; there are two groups of annular gaskets 1121, and the two groups of annular gaskets 1121 are arranged at intervals along the axial direction of the branch pipeline 112; the connection point between the return pipeline 113 and the branch pipeline 112 is located between the two groups of annular gaskets 1121; a one-way valve is installed inside the return pipeline 113, and the flow direction of the one-way valve is from the branch pipeline 112 to the main pipeline 111.

[0047] In this embodiment, the connecting portion 241 passes through the two groups of circular ring pads 1121 and extends to the outside of the two groups of circular ring pads 1121 ; the circular ring pads 1121 play a role in supporting the connecting portion 241 .

[0048] The movement trajectory of the sealing part 242 is from the point where the branch line 112 and the return line 113 are connected to the annular gasket 1121 inside the branch line 112 near the first plugging head 23; that is, it ensures that the inert gas will not enter the main line 111 through the branch line 112.

[0049] Furthermore, a one-way valve is provided inside the return line 113 , and the flow direction of the one-way valve is from the branch line 112 to the main line 111 ; that is, it ensures that the hydrogen inside the main line 111 will not enter the branch line 112 through the return line 113 .

[0050] Furthermore, the movement of the connecting portion 241 synchronously drives the movement of the second plugging head 32, thereby opening the passage of the connecting pipe 31; the inert gas stored inside the airbag 3 enters the main pipe 111 through the reflux pipe 113 to dilute the concentration of hydrogen.

[0051] It should be noted that the connecting part 241 is linked with the second plugging head 32. When the hydrogen in the internal combined space of the first fastener 11 and the second fastener 12 reaches a certain amount, it is affected by the high-pressure hydrogen; the first plugging head 23 moves along its axial direction toward the end away from the second fastener 12; during the movement of the first plugging head 23, the internal channel of the main line 111 is opened; so that the hydrogen is discharged from the cavity along the main line 111; during the movement of the first plugging head 23, the push rod 24 is driven to move, so that the connecting part 241 pushes the second plugging head 32 to move to the side away from the branch line 112, thereby realizing the opening of the internal line of the branch line 112, thereby ensuring that the high-pressure inert gas inside the airbag 3 can enter the branch line 112 through the connecting pipe 31, and then enter the main line 111 through the reflux line 113 to mix with the leaked hydrogen, effectively reducing the hydrogen concentration inside the main line 111, and avoiding explosion caused by excessive hydrogen concentration.

[0052] After the first fastener 11 and the second fastener 12 are fixed to the outer wall of the pipeline, hydrogen can release the pressure generated by the accumulation of leaked hydrogen through the main pipeline 111, effectively avoiding the situation where the hydrogen pressure is too high due to pipeline leakage, making it difficult to connect the first fastener 11 and the second fastener 12 to the outer wall of the pipeline.

[0053] It should be noted that a ball valve 4 is installed at the top of the main line 111. When the first fastener 11 and the second fastener 12 are fixed to the outer wall of the pipeline, the leaked hydrogen can only be discharged from the cavity through the main line 111; at this time, by turning the ball valve 4, the passage inside the main line 111 can be slowly blocked to ensure that the blocking operation of the hydrogen leakage point is completed.

[0054] In the present invention, conductive rubber or metal-rubber composite gaskets are preferably used to avoid the presence of static electricity; the metal parts need to be connected to the grounding system through wires to form a continuous conductive path.

[0055] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

[0056] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hydrogen pipeline leakage plugging device, characterized by: include, A first fastening member (11) adapted to fit the outer wall of the pipe; A second fastening member (12) is arranged in cooperation with the first fastening member (11) and is sleeved on the outside of the pipeline to seal a leaking portion of the pipeline; A lifting member (2) is installed inside the first fastening member (11); An airbag (3) is mounted on one side of the first fastening member (11), the airbag (3) is linked to the lifting member (2), and an inert gas is stored inside the airbag (3); The first fastening member (11) and the second fastening member (12) are installed at the leaking part of the pipeline. The leaked hydrogen is filled into the first fastening member (11) and the second fastening member (12), thereby driving the lifting member (2) to work in conjunction. The lifting member (2) drives the inert gas inside the airbag (3) to be discharged to dilute the concentration of the leaked hydrogen.

2. A hydrogen transmission pipeline leakage plugging device according to claim 1, characterized in that: A sealing gasket (13) is provided inside the first fastening member (11) and the second fastening member (12); The first fastening member (11) comprises a main pipeline (111), a branch pipeline (112) arranged on a side wall of the main pipeline (111), and a return pipeline (113) connecting the main pipeline (111) and the branch pipeline (112); The sealing gasket (13) is in close contact with the outer wall of the pipeline and can limit the flow of hydrogen along the inner wall of the main pipeline (111).

3. A hydrogen transmission pipeline leakage plugging device according to claim 2, characterized in that: The lifting member (2) comprises a first washer (21), and the first washer (21) is installed inside the main pipe (111); A limiting sleeve (22) is provided relatively parallel to the first washer (21); A first sealing head (23) is provided between the limiting sleeve (22) and the first gasket (21); The first plugging head (23) comprises a support rod (231) and a first resetting member (232) covering the outside of the support rod (231); The first reset member (232) releases elastic potential energy, thereby driving the end face of the first plugging head (23) to be in close contact with the first gasket (21).

4. A hydrogen transmission pipeline leakage plugging device according to claim 3, characterized in that: The limiting sleeve (22) comprises a through groove (221), and the through groove (221) is opened at the axis position of the limiting sleeve (22); The through groove (221) is adapted to the support rod (231); the through groove (221) cooperates with the support rod (231), thereby ensuring that the first plugging head (23) moves along the main pipe (111) in a direction that is not parallel to the pipeline axis.

5. The hydrogen transmission pipeline leakage blocking device according to claim 4, characterized in that: A push rod (24) is provided on the inner side of the support rod (231) and is perpendicular to the movement direction of the first plugging head (23); The push rod (24) includes a connecting portion (241) and a sealing portion (242) provided on the outer wall of the connecting portion (241); the sealing portion (242) is in close contact with the inner wall of the branch pipe (112); The side wall of the support rod (231) is provided with an oblique hole (2311); A guide column (2411) is provided on the side wall of the connecting portion (241), and the guide column (2411) is adapted to the inclined hole (2311).

6. A hydrogen transmission pipeline leakage plugging device according to claim 5, characterized in that: The airbag (3) includes a connecting pipe (31) connected to the main pipe (111); A second plugging head (32) is provided inside the connecting pipe (31) for plugging the outlet of the connecting pipe (31); A second resetting member (33) is provided on the outer side of the second plugging head (32); The end of the connecting portion (241) away from the support rod (231) contacts the second blocking head (32).

7. A hydrogen transmission pipeline leakage plugging device according to claim 6, characterized in that: A circular ring gasket (1121) is provided inside the branch pipe (112); The number of the annular gaskets (1121) is two groups, and the two groups of the annular gaskets (1121) are arranged at intervals along the axial direction of the branch pipe (112); The connection point between the return pipeline (113) and the branch pipeline (112) is located between the two groups of annular gaskets (1121); A one-way valve is installed inside the return pipeline (113), and the flow direction of the one-way valve is the direction from the branch pipeline (112) to the main pipeline (111).

8. The hydrogen transmission pipeline leakage blocking device according to claim 7, characterized in that: The movement of the connecting portion (241) synchronously drives the movement of the second plugging head (32), thereby achieving the opening of the passage of the connecting pipe (31); The inert gas stored inside the air bag (3) enters the main line (111) through the reflux line (113) to dilute the concentration of leaked hydrogen.

9. The hydrogen transmission pipeline leakage blocking device according to claim 8, characterized in that: A ball valve (4) is installed at the top of the main pipe (111).

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