End joint fitting for hydrogen transmission flexible pipeline

Abstract

The present invention discloses an end joint fitting for a flexible hydrogen transmission pipeline, comprising: an inner shell, comprising a first vertical arm and a second vertical arm arranged in parallel, a first horizontal arm connected therebetween, and a second horizontal arm connected to the second vertical arm; an outer shell, comprising a third vertical arm and a fourth vertical arm arranged in parallel, and a third horizontal arm connected therebetween; a pipe clamp shell, comprising a fifth vertical arm and a fourth horizontal arm; the outer shell is arranged above the second horizontal arm and defines a cavity, and the pipe clamp shell is arranged in the cavity; the end of the aramid fiber layer of the flexible hydrogen transmission pipeline extends into the fourth horizontal arm and is fixed thereto, the outer protective layer is fixed under the action of a pressure ring, a pressure block, a pressing piece, and a pressing block, a sealing ring is provided between the second horizontal arm and the fourth horizontal arm, the inner lining layer terminates at the top of the second horizontal arm, and the barrier aluminum layer terminates at the sealing ring. The present invention enables the flexible hose to meet the requirements of sealing and molding operations of polymer materials and improve the fatigue resistance and corrosion resistance of the pipeline when the hose is adapted for installation and hydrogen transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy development and utilization, and in particular to an end joint fitting of a hydrogen transmission flexible pipeline. Background Art

[0002] As environmental pollution issues caused by traditional fossil fuels are increasingly recognized, the international energy structure is developing in a low-carbon and clean direction. Hydrogen energy is a recognized clean energy source, and hydrogen combustion can achieve zero carbon emissions. To address the high costs caused by transportation costs in the development and large-scale application of hydrogen energy, pipeline hydrogen transportation has become a most popular solution. In pipeline transportation, ordinary steel pipelines have problems such as high cost, hydrogen embrittlement, and corrosion. Therefore, developing pipeline transportation methods with good transportation performance and low cost has become one of the main challenges in the development of hydrogen energy. Flexible hoses, with their advantages such as good flexibility, strong terrain adaptability, strong corrosion resistance, fast laying speed, and recyclability, have gradually become the equipment of choice for hydrogen pipeline transportation.

[0003] Hydrogen transmission flexible pipelines are usually composed of four pipe layers, including an inner lining layer, an airtight barrier layer, an aramid fiber layer, and an outer protective layer from the inside to the outside. The corresponding functional layers can also be changed according to the actual needs of the project. The end joints are usually located at the end of the hydrogen transmission flexible pipeline system. They have the function of connecting the hydrogen transmission flexible pipeline to offshore and onshore equipment to prevent fluid leakage in the pipe. The end joints have many components and a complex structure. They have high requirements for connection and sealing performance and are the parts of the hydrogen transmission flexible pipeline system that are more prone to failure. Therefore, the structural design of the end joints is more difficult than the structural design of the hydrogen transmission flexible pipeline body.

[0004] At present, the end joints of traditional hydrogen transmission flexible pipelines have the following problems in practical applications:

[0005] ① Composite materials such as epoxy resin are usually poured into the cavity of traditional end joints to bond and fix the flexible hose and the end joint. However, as the service time of the equipment increases, the epoxy resin may age and crack, which seriously affects its adhesion performance and easily leads to separation between the hydrogen transmission flexible pipeline and the end joint, causing safety accidents.

[0006] ② In the marine hydrogen transmission application scenario, the pipeline will be subjected to a large axial load, and the traditional end joints and the connection between the hydrogen transmission flexible pipeline are prone to separation. In addition, under the action of ocean wind, waves, and currents, the connection is prone to fatigue failure and even fracture, seriously affecting the service life of the pipeline.

[0007] ③ The connection between the traditional end joint and the hydrogen transmission flexible pipeline is prone to leakage of the transmission medium. Since hydrogen is flammable and explosive, with a large explosion limit range and high danger, once a hydrogen leakage accident occurs, it will cause a major safety accident, and then cause a lot of economic losses.

[0008] ④ Traditional end joints are generally not equipped with gas leakage detection devices. During the operation of the pipeline, if the leakage is not discovered in time and measures are not taken, it is easy to cause combustion and explosion accidents on site, posing serious safety hazards. Summary of the Invention

[0009] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides an end fitting for a flexible hydrogen transmission pipeline. This fitting is designed to meet the requirements for sealing and molding polymer materials during hose installation and hydrogen transmission, while also improving the pipeline's fatigue and corrosion resistance.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] An end joint fitting for a hydrogen transmission flexible pipeline, suitable for terminating the hydrogen transmission flexible pipeline and connecting it to a facility, comprising:

[0012] The inner casing has a cross-section that is shaped like an inverted "F", comprising a first vertical arm and a second vertical arm arranged in parallel, a first horizontal arm that is perpendicular to the first vertical arm and the second vertical arm and connects the first vertical arm and the second vertical arm into one body, and a second horizontal arm that is perpendicular to the second vertical arm and connected to the second vertical arm;

[0013] An outer shell having a Z-shaped cross section, comprising a third vertical arm and a fourth vertical arm arranged in parallel, and a third horizontal arm perpendicular to the third vertical arm and the fourth vertical arm and connecting the third vertical arm and the fourth vertical arm into one body;

[0014] The clamp tube housing has an L-shaped cross section and includes a fifth vertical arm and a fourth horizontal arm, wherein the fourth horizontal arm is a hollow shell structure;

[0015] wherein the outer shell is arranged above the second transverse arm of the inner shell, the third vertical arm of the outer shell is parallel to the second vertical arm of the inner shell and is arranged adjacent to each other in the horizontal direction and the two are fixed, so that the outer shell and the inner shell are fixedly connected, and the third transverse arm of the outer shell, the second vertical arm and the second transverse arm of the inner shell together define a cavity; the clamp shell is arranged in the cavity, and the fifth vertical arm of the clamp shell is parallel to the second vertical arm of the inner shell and is arranged at intervals in the horizontal direction and the two are fixed, and the fourth transverse arm of the clamp shell is arranged in parallel between the second transverse arm and the third transverse arm, so that the outer shell, the inner shell and the clamp shell are fixedly connected;

[0016] The end of the aramid fiber layer of the hydrogen transmission flexible pipeline extends into the fourth horizontal arm of the tube clamping shell and is fixedly connected thereto; an upper pressure ring and a lower pressure ring are respectively pressed on the upper and lower sides of the aramid fiber layer, and a pressure block is provided on the upper pressure ring, and the front end of the outer protective layer of the hydrogen transmission flexible pipeline terminates at the upper pressure ring and the pressure block; a tightening piece is provided on the outside of the outer protective layer, and the end of the tightening piece is plastically deformed radially inward around the circumference to form an external support for the pressure block; a tightening block is provided between the outer protective layer located outside the tightening piece and the fourth vertical arm, and the inner side of the tightening block is in contact with the tightening piece, and the outer protective layer is fixed under the action of the upper pressure ring, pressure block, tightening piece and tightening block; a sealing ring is provided between the second horizontal arm of the inner shell and the fourth horizontal arm of the tube clamping shell, the inner lining layer of the hydrogen transmission flexible pipeline terminates at the top end of the second horizontal arm, and the barrier aluminum layer of the hydrogen transmission flexible pipeline terminates at the sealing ring.

[0017] Preferably, a first fixing hole is formed on the third vertical arm of the outer shell, and a second fixing hole is formed on the second vertical arm of the inner shell. The first fixing hole of the third vertical arm and the second fixing hole of the second vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the outer shell are fixedly connected by a first fixing member.

[0018] Preferably, a third fixing hole is formed on the third vertical arm of the outer shell, and a fourth fixing hole is formed on the second vertical arm of the inner shell. The third fixing hole of the third vertical arm and the fourth fixing hole of the second vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the outer shell are fixedly connected by a second fixing member.

[0019] Preferably, a fifth fixing hole is formed on the second vertical arm of the inner shell, a sixth fixing hole is formed on the fifth vertical arm of the clamp tube shell, the fifth fixing hole of the second vertical arm and the sixth fixing hole of the fifth vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the clamp tube shell are fixedly connected by a third fixing member.

[0020] Preferably, the width of the pressing block is slightly larger than the width of the gap between the fourth vertical arm and the outer protective layer, forming an interference fit.

[0021] Preferably, the fixed connection method between the end of the aramid fiber layer and the fourth cross arm is as follows: there are multiple raised aramid fiber teeth on the aramid fiber layer, and the tooth tips of the aramid fiber teeth first contact the fourth cross arm, and then penetrate and embed into the outer surface of the fourth cross arm.

[0022] Preferably, a penetrating grease injection hole is formed on the third transverse arm of the outer shell, and epoxy resin is injected into the cavity from the grease injection hole for potting and filling, so as to bond the tube clamping shell in the cavity to the hydrogen transmission flexible pipe.

[0023] Preferably, a hydrogen leakage detection and alarm device for detecting and alarming hydrogen leakage is installed on the outer side of the third cross arm of the outer shell.

[0024] Preferably, a fastener is provided between the inner shell and the clamping tube shell, the cross section of the fastener is T-shaped, and the fastener is fixedly connected to the second vertical arm, the fifth vertical arm and the second horizontal arm.

[0025] The present invention has the following advantages due to the adoption of the above technical solution:

[0026] 1. When the end joint fitting provided by the present invention is connected to the hydrogen transmission flexible pipeline, the end of the aramid fiber layer is fixed with a pipe clamp sleeve to prevent the flexible pipeline and the end joint fitting from being separated due to the failure of the adhesion between the epoxy resin and the pipe clamp sleeve. In addition, the end of the aramid fiber layer is extended in the cavity, which increases the contact area between the aramid fiber layer and the epoxy resin in the pipe clamp sleeve, increases the axial tensile strength between the aramid fiber layer in the pipe clamp sleeve and the joint, and effectively improves the safety of the equipment during operation.

[0027] 2. The end joint fitting provided by the present invention is connected and fixed to the right end of the outer shell through a compression block. Welding is adopted to cooperate with the compression piece to ensure the axial connection between the end joint and the hose is stable to prevent structural failure.

[0028] 3. The end fitting provided by the present invention is connected and fixed to the left end of the outer shell via a flange structure. A gasket is used to seal the gap, ensuring a more secure connection and a good sealing performance. A seal is also provided at the lower end of the extended aramid fiber layer to minimize gas leakage at the connection between the hose and the fitting.

[0029] 4. A leakage detection alarm device is provided on the upper end of the outer shell of the end joint accessory provided by the present invention. An airbag is provided in the device. When a large amount of hydrogen leaks in a short period of time, the airbag expands, pushing the electrode sheet above the alarm, and then sounding an alarm, which greatly improves the safety of production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0031] Figure 1 This is an appearance diagram of the end joint fitting provided by one embodiment of the present invention when connected to a hydrogen transmission flexible pipeline;

[0032] Figure 2 A schematic structural diagram of an inner shell provided in one embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of an outer shell provided in one embodiment of the present invention;

[0034] Figure 4 A schematic structural diagram of a pipe clamp housing provided in one embodiment of the present invention;

[0035] Figure 5 A cross-sectional schematic diagram of the connection between the end joint fitting provided by one embodiment of the present invention and the hydrogen transmission flexible pipeline. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the present invention. They are not intended to indicate or imply that the systems or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the use of terms such as "first" and "second" to define components is intended solely to facilitate distinction between such components. Unless otherwise stated, these terms have no special meanings and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] The end joint fitting of the hydrogen transmission flexible pipeline provided by the present invention includes: an inner shell, including a first vertical arm and a second vertical arm arranged in parallel, a first horizontal arm connected between the two, and a second horizontal arm connected to the second vertical arm; an outer shell, including a third vertical arm and a fourth vertical arm arranged in parallel and a third horizontal arm connected between the two; a pipe clamp shell, including a fifth vertical arm and a fourth horizontal arm; the outer shell is arranged above the second horizontal arm and defines a cavity, and the pipe clamp shell is arranged in the cavity; the end of the aramid fiber layer of the hydrogen transmission flexible pipeline extends into the fourth horizontal arm and is fixed thereto, the outer protective layer is fixed under the action of a pressure ring, a pressure block, a pressing piece and a pressing block, a sealing ring is provided between the second horizontal arm and the fourth horizontal arm, the inner lining layer terminates at the top of the second horizontal arm, and the barrier aluminum layer terminates at the sealing ring. The present invention enables it to meet the requirements of the sealing molding operation of polymer materials and improve the fatigue resistance and corrosion resistance of the pipeline when the hose is adapted and installed for hydrogen transportation.

[0040] The end joint fitting of the hydrogen transmission flexible pipeline provided by the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0041] like Figure 1 As shown, the end joint fitting of the hydrogen transmission flexible pipeline provided by the embodiment of the present invention mainly includes an outer shell 2, an inner shell 3 and a pipe clamp shell 15, which is suitable for terminating the hydrogen transmission flexible pipeline 1 and connecting it to marine and / or onshore facilities. The hydrogen transmission flexible pipeline 1 includes, from the inside to the outside, but is not limited to, an inner lining layer 13, a barrier aluminum layer 14, an aramid fiber layer 24 and an outer protective layer 23 (see the attached Figure 5 ).

[0042] like Figure 2 As shown, the cross-section of the inner shell 3 is an inverted "F" shape, including a first vertical arm 4 and a second vertical arm 5 arranged in parallel, a first horizontal arm 6 perpendicular to the first vertical arm 4 and the second vertical arm 5 and connecting the two into one, and a second horizontal arm 7 perpendicular to the second vertical arm 5 and connected thereto, wherein the second vertical arm 5 is sequentially formed with threaded holes 39, 40 and 43 from the outside to the inside.

[0043] like Figure 3 As shown, the cross-section of the outer shell 2 is Z-shaped, including a third vertical arm 8 and a fourth vertical arm 9 arranged in parallel, and a third horizontal arm 10 perpendicular to the third vertical arm 8 and the fourth vertical arm 9 and connecting the two into one, wherein the third vertical arm 8 is provided with threaded holes 38 and 41 extending from the outside to the inside.

[0044] like Figure 4 As shown, the cross section of the clamp housing 15 is L-shaped, including a fifth vertical arm 16 and a fourth horizontal arm 17 , wherein the fourth horizontal arm 17 is a hollow shell structure, and a threaded hole 44 is formed on the fifth vertical arm 16 .

[0045] like Figure 5As shown, the outer shell 2 is arranged above the second horizontal arm 7 of the inner shell 3, the third vertical arm 8 of the outer shell 2 is parallel to the second vertical arm 5 of the inner shell 3 and is arranged adjacent to each other in the horizontal direction, the threaded hole 38 of the third vertical arm 8 is the same diameter as the threaded hole 39 of the second vertical arm 5 and is flush in the horizontal direction to form a flange structure, the bolt 35 passes through the threaded hole 39 of the second vertical arm 5 and the threaded hole 38 of the third vertical arm 8 and is fixed at the other end with a nut 46, so that the outer shell 2 and the inner shell 3 are fixedly connected, and the third horizontal arm 10 of the outer shell 2 and the second vertical arm 5 and the second horizontal arm 7 of the inner shell 3 jointly define a cavity 29; the clamp tube shell 15 is arranged in the cavity 29, and the fifth vertical arm 16 of the clamp tube shell 15 is parallel to the second vertical arm 5 of the inner shell 3 and is arranged at intervals in the horizontal direction, the clamp tube shell The fourth transverse arm 17 of the shell 15 is arranged in parallel between the second transverse arm 7 and the third transverse arm 10. The threaded hole 41 of the third vertical arm 8 and the threaded hole 40 of the second vertical arm 5 have the same diameter and are flush in the horizontal direction to form a flange structure. The bolt 47 passes through the threaded hole 41 of the third vertical arm 8 and the threaded hole 40 of the second vertical arm 5 and is fixed at the other end with a nut 36, so that the outer shell 2 and the inner shell 3 form a reinforced fixed connection, increasing its axial stability; at the same time, the threaded hole 43 of the second vertical arm 5 and the threaded hole 44 of the fifth vertical arm 16 have the same diameter and are flush in the horizontal direction to form a flange structure. The bolt 48 passes through the threaded hole 43 of the second vertical arm 5 and the threaded hole 44 of the fifth vertical arm 16 and is fixed at the other end with a nut 37, so that the inner shell 3 and the clamping tube shell 15 form a fixed connection.

[0046] The end of the aramid fiber layer 24 of the hydrogen transmission flexible pipe 1 extends into the fourth cross arm 17 of the pipe clamp housing 15 and is fixedly connected thereto. An upper pressure ring 19 and a lower pressure ring 18 are respectively pressed onto the upper and lower sides of the aramid fiber layer 24, and a pressure block 20 is mounted on the upper pressure ring 19. The front end of the outer protective layer 23 of the hydrogen transmission flexible pipe 1 terminates at the upper pressure ring 19 and the pressure block 20. A compression piece 21 is sequentially mounted on the outside of the outer protective layer 23. The end of the compression piece 21 is plastically deformed radially inward around the circumference to form external support for the pressure block 20. A pressing block 22 is provided between the outer protective layer 23 located outside the pressing member 21 and the fourth vertical arm 9. The width of the pressing block 22 is slightly larger than the width of the gap between the fourth vertical arm 9 and the outer protective layer 23, forming an interference fit. The inner side of the pressing block 22 contacts the pressing member 21, exerting a compressive effect. The outer protective layer 23 is thus fixed by the upper pressure ring 19, the pressing block 20, the pressing member 21, and the pressing block 22. A sealing ring 12 is provided between the second horizontal arm 7 of the inner casing 3 and the fourth horizontal arm 17 of the tube clamp casing 15. The inner lining layer 13 of the hydrogen transmission flexible pipeline 1 terminates at the top of the second horizontal arm 7, and the barrier aluminum layer 14 of the hydrogen transmission flexible pipeline 1 terminates at the sealing ring 12. The sealing ring 12 is used at the contact interface between the inner lining layer 13, the second horizontal arm 7, and the fourth horizontal arm 17 to prevent leakage and penetration of the fluid in the pipeline.

[0047] In the above embodiment, the end of the aramid fiber layer 24 is preferably fixedly connected to the fourth cross arm 17 in the following manner: the aramid fiber layer 24 is provided with a plurality of raised aramid fiber teeth 25, the tips of which first contact the fourth cross arm 17 and then penetrate and embed into the outer surface of the fourth cross arm 17. This embedding method can be optimized by selecting the profile of the teeth, the wall thickness of the fourth cross arm 17, and the material strength of the fourth cross arm 17 to obtain maximum shear strength of the accessory.

[0048] In the above embodiment, preferably, a penetrating grease injection hole 28 is formed on the third cross arm 10 of the outer shell 2, and epoxy resin is injected into the cavity 29 from the grease injection hole 28 for potting and filling, so as to bond the tube clamping shell 15 in the cavity 29 to the hydrogen transmission flexible pipeline 1, thereby ensuring that the structure has better stability and sealing.

[0049] In the above embodiment, a hydrogen leak detection and alarm device 30 is preferably installed on the outer side of the third cross arm 10 of the outer shell 2. When hydrogen leaks to a certain extent within a short period of time, the airbag 31 of the hydrogen leak detection and alarm device 30 expands, pushing the spring actuator 32 into contact with the upper electrode 33, causing the alarm 34 to sound an alarm, thereby detecting and alarming the hydrogen leak. It should be noted that the hydrogen leak detection and alarm device 30 is an existing, mature product. Its specific structure and operating principle are common knowledge in the art and will not be described in detail here.

[0050] In the above embodiment, preferably, a fastener 26 is provided between the inner sleeve 3 and the clamp sleeve 15. The cross-section of the fastener 26 is T-shaped. The fastener 26 is fixedly connected to the second vertical arm 5, the fifth vertical arm 16 and the second horizontal arm 7. The fastener 26 can provide strength to the structure in both the transverse and longitudinal directions.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An end joint fitting for a hydrogen transmission flexible pipeline, suitable for terminating a hydrogen transmission flexible pipeline and connecting it to a facility, characterized in that: The end fittings include: An inner casing, wherein the cross section of the inner casing is shaped like an inverted "F", comprising a first vertical arm and a second vertical arm arranged in parallel, a first horizontal arm perpendicular to the first vertical arm and the second vertical arm and connecting the first vertical arm and the second vertical arm into one body, and a second horizontal arm perpendicular to the second vertical arm and connected thereto; An outer shell having a Z-shaped cross-section, comprising a third vertical arm and a fourth vertical arm arranged in parallel, and a third horizontal arm perpendicular to the third vertical arm and the fourth vertical arm and connecting the third vertical arm and the fourth vertical arm into one body; The clamp tube housing has an L-shaped cross section and includes a fifth vertical arm and a fourth horizontal arm, wherein the fourth horizontal arm is a hollow shell structure; wherein the outer shell is arranged above the second transverse arm of the inner shell, the third vertical arm of the outer shell is parallel to the second vertical arm of the inner shell and is arranged adjacent to each other in the horizontal direction and the two are fixed, so that the outer shell and the inner shell are fixedly connected, and the third transverse arm of the outer shell, the second vertical arm and the second transverse arm of the inner shell together define a cavity; the clamp shell is arranged in the cavity, and the fifth vertical arm of the clamp shell is parallel to the second vertical arm of the inner shell and is arranged at intervals in the horizontal direction and the two are fixed, and the fourth transverse arm of the clamp shell is arranged in parallel between the second transverse arm and the third transverse arm, so that the outer shell, the inner shell and the clamp shell are fixedly connected; The end of the aramid fiber layer of the hydrogen transmission flexible pipeline extends into the fourth horizontal arm of the tube clamping shell and is fixedly connected thereto; an upper pressure ring and a lower pressure ring are respectively pressed on the upper and lower sides of the aramid fiber layer, and a pressure block is provided on the upper pressure ring, and the front end of the outer protective layer of the hydrogen transmission flexible pipeline terminates at the upper pressure ring and the pressure block; a tightening piece is provided on the outside of the outer protective layer, and the end of the tightening piece is plastically deformed radially inward around the circumference to form an external support for the pressure block; a tightening block is provided between the outer protective layer located outside the tightening piece and the fourth vertical arm, and the inner side of the tightening block is in contact with the tightening piece, and the outer protective layer is fixed under the action of the upper pressure ring, pressure block, tightening piece and tightening block; a sealing ring is provided between the second horizontal arm of the inner shell and the fourth horizontal arm of the tube clamping shell, the inner lining layer of the hydrogen transmission flexible pipeline terminates at the top end of the second horizontal arm, and the barrier aluminum layer of the hydrogen transmission flexible pipeline terminates at the sealing ring.

2. The end fitting according to claim 1, wherein: A first fixing hole is formed on the third vertical arm of the outer shell, and a second fixing hole is formed on the second vertical arm of the inner shell. The first fixing hole of the third vertical arm and the second fixing hole of the second vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the outer shell are fixedly connected by a first fixing member.

3. The end fitting according to claim 1, wherein: A third fixing hole is formed on the third vertical arm of the outer shell, and a fourth fixing hole is formed on the second vertical arm of the inner shell. The third fixing hole of the third vertical arm and the fourth fixing hole of the second vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the outer shell are fixedly connected by a second fixing member.

4. The end fitting according to claim 1, wherein: A fifth fixing hole is formed on the second vertical arm of the inner shell, and a sixth fixing hole is formed on the fifth vertical arm of the clamp shell. The fifth fixing hole of the second vertical arm and the sixth fixing hole of the fifth vertical arm have the same diameter and are flush in the horizontal direction to form a flange structure, and the inner shell and the clamp shell are fixedly connected by a third fixing piece.

5. The end fitting according to claim 1, wherein: The width of the pressing block is slightly larger than the width of the gap between the fourth vertical arm and the outer protective layer, forming an interference fit.

6. The end fitting according to claim 1, wherein: The fixed connection method between the end of the aramid fiber layer and the fourth cross arm is specifically as follows: there are multiple raised aramid fiber teeth on the aramid fiber layer, and the tooth tips of the aramid fiber teeth first contact the fourth cross arm, and then penetrate and embed into the outer surface of the fourth cross arm.

7. The end fitting according to claim 1, wherein: A penetrating grease injection hole is formed on the third transverse arm of the outer shell, and epoxy resin is injected into the cavity from the grease injection hole for potting and filling, so as to bond the tube clamping shell in the cavity to the hydrogen transmission flexible pipe.

8. The end fitting according to claim 1, wherein: A hydrogen leakage detection and alarm device for detecting and alarming hydrogen leakage is installed on the outer side of the third cross arm of the outer shell.

9. The end fitting according to claim 1, wherein: A fastener is provided between the inner shell and the clamping tube shell. The cross section of the fastener is T-shaped. The fastener is fixedly connected to the second vertical arm, the fifth vertical arm and the second horizontal arm.

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