A filling metal hose for hydrogen gas delivery

Abstract

The application discloses a metal hose for hydrogen delivery and filling, and belongs to the technical field of hydrogen delivery metal hoses.The metal hose comprises a pipe body and a pipe joint, a sealing assembly is sleeved between the pipe body and the pipe joint, the pipe body and the pipe joint are connected through the sealing assembly, a second threaded cylinder is connected through the bottom end of the pipe joint, a nut is threadedly sleeved on the outer wall of the second threaded cylinder, a first threaded cylinder is connected through the bottom end of the nut, the threaded directions of the outer walls of the first threaded cylinder and the second threaded cylinder are opposite, and the bottom end of the first threaded cylinder is connected with the sealing assembly.The pipe body and the pipe joint are connected through the sealing assembly, the pipe body and the pipe joint which are both made of metal are prevented from directly contacting each other, the second threaded cylinder is arranged in the gap at the top end of the pipe body, the sealing assembly is inserted into the pipe body and the pipe joint to seal the end portions of the pipe body and the pipe joint, the stability of the connection between the pipe body and the pipe joint is improved, stress impact is reduced, and the stability of the sealing structure is ensured.

Description

Technical Field

[0001] This application relates to the field of hydrogen transport metal hose technology, and more specifically, to a filling metal hose for hydrogen transport. Background Technology

[0002] Hydrogen, as a clean and efficient new energy source, is widely used in new energy vehicles, chemicals, aerospace, and other fields. Its transportation and filling processes place extremely high demands on the safety, sealing, and stability of the equipment. Metal hoses, due to their excellent flexibility, pressure resistance, and impact resistance, are indispensable connecting components in hydrogen transportation and filling systems. They are mainly used to achieve flexible connections between pipe fittings and filling equipment / storage containers, adapting to the movement and bending requirements of filling scenarios. However, hydrogen has extremely high permeability. Under high pressure, normal temperature, or low temperature environments, hydrogen molecules easily penetrate into the interior of metal materials, leading to a decrease in plasticity and brittle fracture—a phenomenon known as hydrogen embrittlement. Hydrogen embrittlement can severely damage the connection structure and the hose itself, causing hydrogen leakage and even major safety accidents such as explosions and fires. Therefore, hydrogen embrittlement protection and sealing performance are core design considerations for metal hoses used in hydrogen transportation and filling.

[0003] Currently, the metal hoses used for hydrogen transportation and filling are made of high-pressure resistant metal materials such as stainless steel. The ends of the hoses are mostly installed by threaded connection with pipe fittings to achieve quick connection between pipes. A sealing ring is fitted at the connection between the hose and the pipe fitting to achieve a seal and prevent hydrogen leakage. Furthermore, a hydrogen embrittlement resistant coating (such as a hydrofluoric acid resistant anti-corrosion coating) is applied to the inner wall of the hose and pipe fitting to delay the damage caused by hydrogen embrittlement.

[0004] However, under long-term use, the joints of the aforementioned existing metal hoses are subjected to mechanical stresses such as vibration. Although the sealing rings can provide elastic buffering, the sealing rings, which play a sealing role, are prone to cracking due to hydrogen embrittlement and long-term mechanical stress after prolonged contact with hydrogen, leading to seal failure. This can result in leakage of hydrogen transported inside the metal hose. Leaking hydrogen can cause environmental pollution and poisoning, and in severe cases, it can even cause fires and explosions, posing a significant safety hazard.

[0005] In view of this, we propose a metal hose for filling hydrogen gas, which provides a safer and more reliable connection. Summary of the Invention

[0006] Technical problem to be solved: The purpose of this application is to provide a metal hose for filling hydrogen transportation, which solves the technical problem mentioned in the background art above.

[0007] Technical Solution: This application provides a hydrogen conveying filling metal hose, including a hose body and a connector. A sealing assembly is sleeved between the hose body and the connector. The hose body and the connector are internally connected through the sealing assembly. A second threaded cylinder is internally connected to the bottom of the connector. A nut is threaded onto the outer wall of the second threaded cylinder. A first threaded cylinder is internally connected to the bottom of the nut. The threads of the first and second threaded cylinders are opposite in direction. A sealing assembly is connected to the bottom of the first threaded cylinder. A spring washer is sleeved on the outer wall of the first threaded cylinder. The spring washer fits between the bottom of the nut and the top of the sealing assembly. A clamping ring is sleeved between the bottom of the sealing assembly and the outer wall of the hose body.

[0008] The sealing assembly includes an outer sealing cylinder threaded onto the outer wall of a first threaded cylinder, an inner sealing component inserted inside the outer sealing cylinder, a gap between the bottom end of a second threaded cylinder and the top end of a tube body, one end of the inner sealing component inserted into the second threaded cylinder and the other end inserted into the tube body, and one side of the inner sealing component being fitted and sealed between the outer wall of the tube body, the inner wall of the outer sealing cylinder and the inner wall of the first threaded cylinder.

[0009] Furthermore, the inner sealing component includes a first inner sealing cylinder and a second inner sealing cylinder, and a leak detection tube is integrally formed and connected between the first inner sealing cylinder and the second inner sealing cylinder;

[0010] The first inner sealing cylinder is inserted into the inside of the pipe body, the second inner sealing cylinder is inserted into the inside of the second threaded cylinder, and the leak detection tube is set between the second threaded cylinder and the pipe body.

[0011] Furthermore, the inner sealing component also includes an inner partition sleeved on the outer wall of the top end of the first inner sealing cylinder, and an outer partition sleeved on the outer wall of the bottom end of the second inner sealing cylinder. The top end of the tube is inserted between the inner wall of the inner partition sleeve and the outer wall of the first inner sealing cylinder, and the outer partition sleeve is inserted into the inside of the first threaded cylinder.

[0012] Furthermore, the inner sealing component also includes a sealing ring fixed between the outer wall of the bottom end of the inner diaphragm and the bottom end of the outer diaphragm. A sealing ring is fixed between the bottom surface of the sealing ring and the bottom end of the inner diaphragm. The sealing ring is fitted between the bottom end of the first threaded cylinder and the inner wall of the outer sealing cylinder, and the sealing ring is fitted between the outer wall of the tube and the inner wall of the outer sealing cylinder.

[0013] Furthermore, the sealing assembly also includes a one-way inlet valve and a hydrogen sensor. Both the one-way inlet valve and the hydrogen sensor are connected through the outer sealing cylinder and the sealing ring. The inner cavity structure is formed by the inner cavity, outer cavity, sealing ring and leak detection tube. One end of the one-way inlet valve and the detection end of the hydrogen sensor are both located inside the cavity.

[0014] Furthermore, two guide ribs are fixed between the outer wall of the inner diaphragm and the inner wall of the outer diaphragm, and the two guide ribs cooperate to form a guide channel. The hydrogen sensor detection end is guided through the guide channel to extend into the top of the inner cavity, so that the hydrogen sensor detection end is set in correspondence with the leak detection tube.

[0015] Furthermore, the tube body is composed of an end tube, multiple straight tubes, and corrugated rings. The multiple straight tubes and multiple corrugated rings are connected at intervals, and the top of the straight tube is connected to the end tube through the tube. The end tube has an inverted funnel-shaped structure.

[0016] Furthermore, the bottom end of the outer sealing cylinder is connected to a connecting cylinder, and a retaining ring is fixed on the outer wall of the connecting cylinder. The retaining ring is composed of two semi-circular arc-shaped sleeves. The inner wall of the sleeves is provided with a first clamping groove and a second clamping groove. The straight pipe and the connecting cylinder are both fitted with sleeves. The corrugated ring is inserted into the first clamping groove, and the retaining ring is inserted into the second clamping groove.

[0017] Furthermore, the bottom end of the first inner sealing cylinder is connected to multiple baffles, which are fitted together and cooperate with the first inner sealing cylinder to form an inverted funnel-shaped structure. The baffles are fitted to the inner wall of the inverted funnel-shaped structure of the end tube.

[0018] Furthermore, two positioning posts are fixed to the inclined outer wall of the end tube, the inner wall of the sealing ring has an inverted funnel structure, the sealing ring fits against the inclined outer wall of the end tube, and two fixed slots are opened on the inner wall of the sealing ring, with the positioning posts inserted into the fixed slots.

[0019] Beneficial effects: One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0020] 1. By using a sealing assembly to achieve a through-connection between the tube body and the fitting of the metal hose, direct contact between the tube body and fitting, both of which are made of metal, is avoided. With the gap between the second threaded cylinder and the top of the tube body, and the sealing assembly inserted into the ends of both the tube body and fitting for sealing, the stability of the connection at the joint between the tube bodies is increased, stress impact is reduced, the stability of the sealing structure is ensured, and the service life of the sealing structure is extended. Furthermore, it protects the inner wall coating of the tube body and fitting, effectively preventing damage to the hydrogen embrittlement-resistant coating and reducing the pressure of hydrogen on the inner walls of the tube body and fitting ends. This reduces the risk of hydrogen penetration into the metal structure of both, lowers the risk of accelerated hydrogen embrittlement, ensures the strength of the metal hose fitting, and thus effectively reduces the risk of hydrogen leakage during hydrogen transport, improving the safety of hydrogen transport via the metal hose.

[0021] 2. The inner sealing component of the sealing assembly effectively resists hydrogen embrittlement by sealing between the tube body and the tube joint, avoiding seal failure due to long-term use and extending the service life of the hose. Furthermore, the inner sealing component is inserted between the second threaded cylinder and the inside of the tube body, achieving a detachable connection. It can be replaced only when the inner sealing component fails, thus continuing to achieve safe hydrogen delivery and reducing maintenance costs.

[0022] 3. The outer sealing sleeve is threaded onto the outer wall of the first threaded sleeve, and the two ends of the inner sealing component are respectively inserted into the second threaded sleeve and the inside of the pipe body, and are fitted and sealed between the inner walls of the pipe body, the outer sealing sleeve and the first threaded sleeve, forming a multi-seal structure to ensure sealing reliability and adapt to high-pressure hydrogen transportation scenarios.

[0023] 4. By placing the leak detection tube between the first inner sealing cylinder and the second inner sealing cylinder in the gap between the second threaded cylinder and the pipe body, if the inner sealing component fails to seal, hydrogen will seep into the inner cavity without directly overflowing and contacting the pipe body and pipe joint. Combined with a hydrogen sensor, the hydrogen content in the inner cavity can be detected in real time. Once hydrogen leaks into the inner cavity, an early warning can be issued immediately, making it convenient for staff to promptly investigate abnormalities and replace failed components to ensure the safety of hydrogen delivery through the hose.

[0024] 5. The sealing ring is fixed between the bottom surface of the sealing ring and the bottom end of the inner diaphragm, and fits between the outer wall of the pipe body and the inner wall of the outer sealing cylinder. It specifically seals the connection between the pipe body and the outer sealing cylinder, thereby achieving a tight sealing treatment for the pipe joint connection, effectively preventing hydrogen from leaking from the gap at the pipe joint connection, and ensuring the sealing reliability of the hydrogen transmission hose connection joint.

[0025] 6. Two guide ribs are fixed between the outer wall of the inner diaphragm and the inner wall of the outer diaphragm. The two work together to form a guide channel. The detection end of the hydrogen sensor is guided through this channel to extend into the top of the inner cavity for precise positioning. The guide channel ensures that the detection end of the hydrogen sensor is positioned on the side of the leak detection tube, which is the area in the inner sealing component most prone to leakage and hydrogen embrittlement failure. This allows the hydrogen sensor to detect leaking hydrogen in a timely manner, avoiding detection delays and enabling the detection of potential leaks at the first moment to prevent safety accidents. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a metal hose for filling hydrogen transportation according to the present invention.

[0027] Figure 2 This is an exploded view of the overall structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the overall internal connection structure of the present invention.

[0029] Figure 4This is a schematic diagram of the internal sealing component structure of the present invention.

[0030] Figure 5 This is a cross-sectional view of the inner sealing component structure of the present invention.

[0031] Figure 6 This is a schematic diagram of the outer sealing cylinder structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the internal connection structure of the hydrogen sensor, inner sealing component, and outer sealing cylinder of the present invention.

[0033] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0034] Figure 9 This is a schematic diagram of the jacket structure of the present invention.

[0035] Figure 10 This is a schematic diagram of the connection structure between the straight pipe, the corrugated ring, and the end pipe of the present invention.

[0036] The following are the labeling instructions in the diagram: 100, Pipe body; 110, Straight pipe; 120, Corrugated ring; 130, End pipe; 131, Positioning post; 200, Clamping ring; 210, Jacket; 211, First clamping groove; 212, Second clamping groove; 300, Sealing assembly; 310, Outer sealing cylinder; 311, Connecting cylinder; 312, Snap ring; 320, Inner sealing component; 321, First inner sealing cylinder; 322, Inner partition cylinder; 323, Sealing ring; 324, Outer partition cylinder; 325, Second inner sealing cylinder; 326, Leak detection tube; 327, Sealing ring; 3271, Fixed slot; 328, Partition plate; 329, Guide rib plate; 330, One-way air inlet valve; 340, Hydrogen sensor; 400, Nut; 410, First threaded cylinder; 500, Pipe fitting; 510, Second threaded cylinder; 600, Spring washer ring. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Reference Figures 1-10 This application provides a hydrogen conveying filling metal hose, including a pipe body 100 and a pipe connector 500. A sealing assembly 300 is sleeved between the pipe body 100 and the pipe connector 500. The pipe body 100 and the pipe connector 500 are internally connected through the sealing assembly 300. A second threaded cylinder 510 is internally connected to the bottom end of the pipe connector 500. A nut 400 is threadedly sleeved on the outer wall of the second threaded cylinder 510. A first threaded cylinder 410 is internally connected to the bottom end of the nut 400. The threads of the outer walls of the first threaded cylinder 410 and the second threaded cylinder 510 are opposite in direction. The sealing assembly 300 is connected to the bottom end of the first threaded cylinder 410. A spring washer 600 is sleeved on the outer wall of the first threaded cylinder 410. The spring washer 600 fits between the bottom end of the nut 400 and the top end of the sealing assembly 300. A clamping ring 200 is sleeved between the bottom end of the sealing assembly 300 and the outer wall of the pipe body 100.

[0041] The sealing assembly 300 includes an outer sealing cylinder 310 threadedly fitted to the outer wall of a first threaded cylinder 410, an inner sealing component 320 inserted inside the outer sealing cylinder 310, the inner sealing component 320 being made of a non-metallic material resistant to hydrogen embrittlement, a gap being provided between the bottom end of the second threaded cylinder 510 and the top end of the tube body 100, one end of the inner sealing component 320 being inserted inside the second threaded cylinder 510 and the other end being inserted inside the tube body 100, and one side of the inner sealing component 320 being fitted and sealed between the outer wall of the tube body 100, the inner wall of the outer sealing cylinder 310, and the inner wall of the first threaded cylinder 410;

[0042] By connecting the tube body 100 and the pipe joint 500 of the metal hose through the sealing assembly 300, direct contact between the tube body 100 and the pipe joint 500, which are both made of metal, is avoided. With the gap set between the second threaded cylinder 510 and the top of the tube body 100, and the sealing assembly 300 inserted into the ends of the tube body 100 and the pipe joint 500 respectively for sealing, the stability of the connection at the joint between the tube bodies is increased, stress impact is reduced, the stability of the sealing structure is ensured, and the inner wall coating of both is protected, effectively preventing damage to the hydrogen embrittlement resistant coating, and reducing the pressure of hydrogen on the inner wall of the ends of the tube body 100 and the pipe joint 500. This reduces the risk of hydrogen embrittlement from penetrating into the interior of the metal structure of both, reduces the risk of hydrogen embrittlement, ensures the strength of the metal hose joint, and thus effectively reduces the risk of hydrogen leakage during hydrogen transportation, improving the safety of hydrogen transportation by the metal hose.

[0043] The inner sealing component 320 of the sealing assembly 300 effectively resists hydrogen embrittlement by sealing between the tube body 100 and the pipe joint 500, avoiding seal failure due to long-term use and extending the service life of the hose. Furthermore, the inner sealing component 320 is inserted between the second threaded cylinder 510 and the tube body 100, achieving a detachable connection. It can be replaced only when the inner sealing component 320 fails, thus continuing to achieve safe hydrogen delivery and reducing maintenance costs.

[0044] The outer sealing cylinder 310 is threaded onto the outer wall of the first threaded cylinder 410, and the two ends of the inner sealing component 320 are respectively inserted into the second threaded cylinder 510 and the inside of the pipe body 100, and are fitted and sealed between the inner walls of the pipe body 100, the outer sealing cylinder 310 and the first threaded cylinder 410, forming a multi-seal structure to ensure sealing reliability and adapt to high-pressure hydrogen transportation scenarios.

[0045] The nut 400 is threaded onto the outer wall of the second threaded cylinder 510. The first threaded cylinder 410 at its bottom end has a thread direction opposite to that of the second threaded cylinder 510. Rotating the nut 400 can quickly lock the pipe body 100 and the pipe joint 500, reducing assembly difficulty. At the same time, the spring washer 600 fits between the nut 400 and the sealing assembly 300 to prevent the connection between the first threaded cylinder 410 and the sealing assembly 300 from loosening, thus improving the stability of the hose connection.

[0046] The clamping ring 200 is sleeved between the bottom end of the sealing assembly 300 and the outer wall of the tube body 100, which strengthens the connection stability between the sealing assembly 300 and the tube body 100 and further improves the sealing performance.

[0047] In this embodiment, the inner sealing component 320 includes a first inner sealing cylinder 321 and a second inner sealing cylinder 325, and a leak detection tube 326 is integrally formed and connected between the first inner sealing cylinder 321 and the second inner sealing cylinder 325.

[0048] The first inner sealing cylinder 321 is inserted into the inside of the pipe body 100, the second inner sealing cylinder 325 is inserted into the inside of the second threaded cylinder 510, and the leak detection tube 326 is disposed between the second threaded cylinder 510 and the pipe body 100.

[0049] By adopting a segmented structure for the inner sealing component 320, the first inner sealing cylinder 321 is inserted into the inside of the pipe body 100 and the second inner sealing cylinder 325 is inserted into the inside of the second threaded cylinder 510, thus ensuring the connection accuracy between the inner sealing component 320 and the pipe body 100 and the pipe joint 500 and improving the convenience of connection.

[0050] In this embodiment, the inner sealing component 320 further includes an inner partition 322 sleeved on the outer wall of the top end of the first inner sealing cylinder 321, and an outer partition 324 sleeved on the outer wall of the bottom end of the second inner sealing cylinder 325. The top end of the tube body 100 is inserted between the inner wall of the inner partition 322 and the outer wall of the first inner sealing cylinder 321, and the outer partition 324 is fitted into the inside of the first threaded cylinder 410.

[0051] The inner partition 322 is sleeved on the outer wall of the top end of the first inner sealing cylinder 321. The top end of the tube body 100 is inserted between the inner partition 322 and the first inner sealing cylinder 321, providing precise guidance for the insertion of the tube body 100 and the first inner sealing cylinder 321. Simultaneously, it forms an isolation and protection at the connection between the inner sealing component 320 and the tube body 100, preventing hydrogen permeation and corrosion. The outer partition 324 is sleeved on the outer wall of the bottom end of the second inner sealing cylinder 325 and inserted into the first threaded cylinder 410, providing guidance for the insertion of the second inner sealing cylinder 325 and the first threaded cylinder 410, and strengthening the inner sealing component. The connection stability between the sealing component 320 and the first threaded cylinder 410 is improved to prevent loosening of the connection. The cooperation between the inner partition cylinder 322 and the outer partition cylinder 324 significantly improves the overall structural rigidity of the inner sealing component 320, preventing it from shifting or deforming and ensuring long-term stable sealing performance. The isolation structure can prevent hydrogen from penetrating into the gap between the inner sealing component 320 and the outer structure, further reducing the risk of hydrogen embrittlement, protecting the insertion end of the tube body 100 and the second threaded cylinder 510 from corrosion, and extending the service life of the inner sealing component 320, the tube body 100, and the pipe joint 500.

[0052] In this embodiment, the inner sealing component 320 further includes a sealing ring 323 fixed between the outer wall of the bottom end of the inner partition cylinder 322 and the bottom end of the outer partition cylinder 324. A sealing ring 327 is fixed between the bottom surface of the sealing ring 323 and the bottom end of the inner partition cylinder 322. The sealing ring 323 is fitted between the bottom end of the first threaded cylinder 410 and the inner wall of the outer sealing cylinder 310. The sealing ring 327 is fitted between the outer wall of the tube body 100 and the inner wall of the outer sealing cylinder 310.

[0053] The sealing ring 323 is fixed between the bottom ends of the inner partition 322 and the outer partition 324, integrating the segments of the inner sealing component 320 into a whole, improving structural integrity and stability. The sealing ring 323 is fitted between the bottom end of the first threaded cylinder 410 and the inner wall of the outer sealing cylinder 310, achieving precise positioning of the sealing assembly 300 and the first threaded cylinder 410, preventing loosening of the connection, and forming an additional sealing surface to improve overall sealing performance. The sealing ring 327 is fixed between the bottom surface of the sealing ring 323 and the bottom end of the inner partition 322, and fits against the outer wall of the tube body 100 and the inner wall of the outer sealing cylinder 310. The connection between the inner sealing tube 100 and the outer sealing cylinder 310 is specifically sealed to achieve a tight seal at the pipe joint connection, effectively preventing hydrogen leakage from the gap at the pipe joint connection and ensuring the sealing reliability of the hydrogen delivery hose connection. The cooperation between the sealing ring 327 and the sealing ring 323 fills the weak sealing points at the joints of the various sections of the inner sealing component 320, forming a comprehensive and seamless sealing structure. The positioning function of the sealing ring 323 ensures that the inner sealing component 320 is precisely pressed when the first threaded cylinder 410 is locked, further improving the sealing tightness.

[0054] In this embodiment, the sealing assembly 300 further includes a one-way inlet valve 330 and a hydrogen sensor 340. The one-way inlet valve 330 and the hydrogen sensor 340 are both connected through the outer sealing cylinder 310 and the sealing ring 323. The inner partition cylinder 322, the outer partition cylinder 324, the sealing ring 323 and the leak detection tube 326 cooperate to form an inner cavity structure. One end of the one-way inlet valve 330 and the detection end of the hydrogen sensor 340 are both located inside the inner cavity.

[0055] The sealing assembly 300 integrates a one-way inlet valve 330 and a hydrogen sensor 340, both of which are connected through the outer sealing cylinder 310 and the sealing ring 323. Their ends are located within the inner cavity structure formed by the inner partition cylinder 322, outer partition cylinder 324, sealing ring 323, and leak detection tube 326. The one-way inlet valve 330 can fill the inner cavity with inert gas, creating an inert protective atmosphere to prevent the inner sealing component 320 from being corroded by the external environment and slow down its aging. Simultaneously, the inert gas can serve as a leak detection medium. By placing the leak detection tube between the first and second inner sealing cylinders in the gap between the second threaded cylinder and the pipe body, if the inner sealing component fails to seal, hydrogen will seep into the inner cavity without directly overflowing and contacting the pipe body and pipe joint. Combined with the hydrogen sensor, the hydrogen content in the inner cavity can be detected in real time. Once hydrogen leaks into the inner cavity, an early warning can be issued immediately, facilitating timely troubleshooting and replacement of faulty components to ensure the safety of hydrogen delivery via the hose.

[0056] In this embodiment, two guide ribs 329 are fixed between the outer wall of the inner partition 322 and the inner wall of the outer partition 324. The two guide ribs 329 cooperate to form a guide channel. The detection end of the hydrogen sensor 340 is guided to extend into the top of the inner cavity through the guide channel so that the detection end of the hydrogen sensor 340 is correspondingly set with the leak detection tube 326.

[0057] Two guide ribs 329 are fixed between the outer wall of the inner partition 322 and the inner wall of the outer partition 324. The two work together to form a guide channel. The detection end of the hydrogen sensor 340 is guided through this channel to extend into the top of the inner cavity for precise positioning. The guide channel ensures that the detection end of the hydrogen sensor 340 is positioned on the side of the leak detection tube 326. The leak detection tube 326 is the area in the inner sealing component 320 most prone to leakage and hydrogen embrittlement failure. This allows the hydrogen sensor 340 to detect leaked hydrogen in a timely manner, avoiding detection delays and enabling the detection of potential leaks at the first moment to prevent safety accidents.

[0058] In this embodiment, the tube body 100 is composed of an end tube 130, a plurality of straight tubes 110, and a corrugated ring 120. The plurality of straight tubes 110 and the plurality of corrugated rings 120 are connected at intervals. The top end of the straight tube 110 is connected to the end tube 130 through it. The end tube 130 has an inverted funnel-shaped structure.

[0059] The bottom end of the outer sealing cylinder 310 is connected to the docking cylinder 311. The outer wall of the docking cylinder 311 is fixed with a retaining ring 312. The clamping ring 200 is composed of two semi-circular arc-shaped clamps 210. The inner wall of the clamps 210 is provided with a first clamping groove 211 and a second clamping groove 212. The straight pipe 110 and the docking cylinder 311 are jointly fitted with the clamps 210. The corrugated ring 120 is inserted into the first clamping groove 211 and the retaining ring 312 is inserted into the second clamping groove 212.

[0060] The bottom end of the first inner sealing cylinder 321 is connected to a plurality of baffles 328. The plurality of baffles 328 are fitted together and cooperate with the first inner sealing cylinder 321 to form an inverted funnel-shaped structure. The baffles 328 are fitted together and adhere to the inner wall of the inverted funnel-shaped structure of the end tube 130.

[0061] The tube body 100 is composed of multiple straight tubes 110 and corrugated rings 120 connected at intervals. The corrugated rings 120 can enable the tube body 100 to bend flexibly, meeting the movement and bending requirements of the filling scenario, while dispersing the stress during bending and avoiding the aggravation of hydrogen embrittlement caused by stress concentration. The top straight tube 110 is connected to the inverted funnel-shaped end tube 130. The inverted funnel-shaped structure provides precise guidance for the insertion of the inner sealing component 320, reducing the assembly difficulty. The docking cylinder 311 at the bottom of the outer sealing cylinder 310 is sleeved on the outer wall of the straight tube 110. The clamping ring 200 is composed of two semi-circular arc-shaped clamps 210. The first clamping groove 211 on its inner wall is used to insert the corrugated ring 120, and the second clamping groove 212 is used to insert the docking cylinder. The retaining ring 312 on the outer wall of 311 can quickly fix the docking cylinder 311 to the tube body 100, enhance the connection stability between the sealing component 300 and the tube body 100, and prevent loosening under high pressure. The multiple baffles 328 at the bottom of the first inner sealing cylinder 321 cooperate to form an inverted funnel-shaped structure, which elastically fits the inverted funnel-shaped inner wall of the end tube 130. This not only achieves a tight fit between the inner sealing component 320 and the tube body 100, eliminating sealing dead corners, but also protects the inner wall of the end tube 130, preventing hydrogen from directly corroding the inner wall of the end tube 130 and reducing the risk of hydrogen embrittlement. The elastic fit design of the baffles 328 can adapt to the slight dimensional deviations of the end tube 130, further improving the sealing reliability.

[0062] In this embodiment, two positioning posts 131 are fixed on the inclined outer wall of the end tube 130, the inner wall of the sealing ring 327 is an inverted funnel structure, the sealing ring 327 is attached to the inclined outer wall of the end tube 130, and two fixed slots 3271 are opened on the inner wall of the sealing ring 327, and the positioning posts 131 are inserted into the fixed slots 3271.

[0063] Two positioning posts 131 are fixed to the inclined outer wall of the end tube 130, and two corresponding positioning slots 3271 are opened on the inner wall of the sealing ring 327. The positioning posts 131 are inserted into the positioning slots 3271 to achieve precise positioning of the sealing ring 327 and the end tube 130, and to prevent the sealing ring 327 from shifting or rotating. The inner wall of the sealing ring 327 is designed as an inverted funnel structure, which is fully adapted to the inverted funnel-shaped inclined outer wall of the end tube 130, ensuring that the sealing ring 327 and the outer wall of the end tube 130 are fully and tightly fitted, thereby improving the sealing performance.

[0064] In this embodiment, the inner sealing component 320 is made of non-metallic materials such as ceramics, engineering plastics, and carbon fiber composites. These non-metallic materials have good processing performance and sealing performance, are suitable for conventional pressure conveying scenarios, avoid the problem of insufficient hydrogen embrittlement resistance of materials, and ensure the hydrogen embrittlement protection effect and long-term reliability of the inner sealing component 320.

[0065] In this embodiment, the baffle is made of elastic non-metallic materials such as fluororubber, silicone rubber, and perfluoroether rubber. These non-metallic elastic materials all have good resistance to hydrogen embrittlement and elastic recovery properties, which can satisfy the convenience of inserting and attaching the baffle to the inside of the tube.

[0066] Specifically, according to Figures 1-10 As shown, the inner walls of the pipe body 100 and the pipe joint 500 are first coated with the hydrogen embrittlement resistant coating disclosed in the prior art. Then, the sealing assembly 300 is pre-installed on the pipe body 100. The outer sealing sleeve 310 is sleeved on the top of the pipe body 100, and the connecting sleeve 311 is sleeved on the outer wall of the straight pipe 110 near the top of the pipe body 100. The two sleeves 210 are fitted together to form a clamping ring 200. The clamping ring 200 is sleeved on the connecting sleeve 311 and the outer wall of the straight pipe 110. The corrugated ring 120 is fitted into the first clamping groove 211, and the retaining ring 312 is fitted into the second clamping groove 212. Then, the two sleeves 210 are fixed together to complete the fixation between the outer sealing sleeve 310 and the pipe body 100.

[0067] Then, multiple baffles 328 are folded inward simultaneously to reduce the overall diameter of the baffles 328. The baffles 328 are made of hydrogen-resistant elastic rubber material. Then, the first inner sealing cylinder 321 and multiple baffles 328 are inserted into the end tube 130 of the tube body 100. At the same time, the end tube 130 of the tube body 100 is also inserted between the first inner sealing cylinder 321 and the inner baffle cylinder 322. When the baffles 328 reach the inner wall of the inverted funnel structure of the end tube 130, the elasticity is restored. The multiple baffles 328 form an inverted funnel structure that elastically fits the inner wall of the end tube 130. At this time, the sealing ring 327 fits and seals between the outer wall of the end tube 130 and the inner wall of the docking cylinder 311. The positioning post 131 is inserted into the positioning slot 3271. The sealing ring 323 fits the top of the docking cylinder 311.

[0068] Then, the one-way inlet valve 330 and the hydrogen sensor 340 are respectively connected through the outer sealing cylinder 310 and the sealing ring 323. The end of the one-way inlet valve 330 and the end of the hydrogen sensor 340 are connected to the inner cavity structure formed by the inner partition cylinder 322, the outer partition cylinder 324, the sealing ring 323 and the leak detection tube 326. Inert gas is introduced into the inner cavity through the one-way inlet valve 330. When the hydrogen sensor 340 is connected to the inside of the sealing ring 323, the detection end of the hydrogen sensor 340 is limited and guided by two guide ribs 329, so that the detection end of the hydrogen sensor 340 reaches the position of the leak detection tube 326, thereby enabling the detection of hydrogen leakage at the first time and facilitating workers to eliminate abnormalities in time, and completing the assembly of the sealing assembly 300 and the tube body 100.

[0069] Then, the spring washer is fitted onto the outer wall of the first threaded cylinder 410, so that the rotating nut 400 is threaded onto the outer wall of the second threaded cylinder 510. The sealing assembly 300 with the pipe body 100 is brought close to the pipe joint 500, so that the second inner sealing cylinder 325 is inserted into the second threaded cylinder 510. At the same time, the nut 400 drives the first threaded cylinder 410 to rotate, so that the first threaded cylinder 410 is threaded into the outer sealing cylinder 310. The outer spacer 324 is inserted into the first threaded cylinder 410. The spring washer ring 600 elastically fits between the bottom end of the nut 400 and the top end of the outer sealing cylinder 310 until the bottom end of the first threaded cylinder 410 is pressed against the top surface of the sealing ring 323, so that the sealing ring 327 fits more tightly against the outer wall of the end pipe 130 and the inner wall of the connecting cylinder 311. This achieves a tight sealing treatment for the pipe joint connection, effectively preventing hydrogen from leaking from the gap of the pipe joint connection, and ensuring the sealing reliability of the hydrogen transmission hose connection.

[0070] The top of the outer partition 324 is attached to the inner end face of the first threaded cylinder 410, and together with the protection of the end pipe 130 by the first inner sealing cylinder 321 and the inner partition 322, and the protection of the second threaded cylinder 510 by the second inner sealing cylinder 325 and the outer partition 324, it effectively avoids collision damage to the pipe body 100 and the pipe joint 500 during connection, and reduces the occurrence of damage due to hydrogen embrittlement, and avoids the occurrence of hydrogen embrittlement damage caused by collision damage, thereby improving the safety of the pipe body 100 and the pipe joint 500 and extending the service life of the metal hose;

[0071] Finally, the hydrogen output from the pipe connector 500 is sequentially transported into the pipe body 100 through the second inner sealing cylinder 325, the leak detection pipe 326, and the first inner sealing cylinder 321. Combined with the hydrogen sensor 340, hydrogen leakage into the inner cavity can be detected in a timely manner, and it can be determined that the overall hydrogen embrittlement resistance and sealing effect of the inner sealing component 320 have been reduced. In this case, the inner sealing component 320 can be disassembled and replaced to maintain the hydrogen embrittlement resistance effect at the metal hose connection position, thereby ensuring the safety of hydrogen transportation.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. All electrical components mentioned herein are electrically connected to the main controller and 220V AC mains power, and the main controller is a common existing technology such as a computer that performs control functions. Content not described in detail in this specification is prior art known to those skilled in the art.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A metal flexible tube for filling hydrogen gas, characterized in that: The device includes a pipe body (100) and a pipe fitting (500). A sealing assembly (300) is sleeved between the pipe body (100) and the pipe fitting (500). The pipe body (100) and the pipe fitting (500) are internally connected through the sealing assembly (300). A second threaded cylinder (510) is internally connected to the bottom end of the pipe fitting (500). A nut (400) is threaded onto the outer wall of the second threaded cylinder (510). A first threaded cylinder is internally connected to the bottom end of the nut (400). The outer walls of the first threaded cylinder (410) and the second threaded cylinder (510) have opposite thread directions. The bottom end of the first threaded cylinder (410) is connected to a sealing assembly (300). A spring washer (600) is sleeved on the outer wall of the first threaded cylinder (410). The spring washer (600) fits between the bottom end of the nut (400) and the top end of the sealing assembly (300). A clamping ring (200) is sleeved between the bottom end of the sealing assembly (300) and the outer wall of the tube body (100). The sealing assembly (300) includes an outer sealing cylinder (310) threaded onto the outer wall of a first threaded cylinder (410), an inner sealing component (320) inserted inside the outer sealing cylinder (310), a gap between the bottom end of a second threaded cylinder (510) and the top end of a tube body (100), one end of the inner sealing component (320) being inserted into the second threaded cylinder (510) and the other end being inserted into the tube body (100), and one side of the inner sealing component (320) being fitted and sealed between the outer wall of the tube body (100), the inner wall of the outer sealing cylinder (310) and the inner wall of the first threaded cylinder (410); The inner sealing component (320) includes a first inner sealing cylinder (321) and a second inner sealing cylinder (325), and a leak detection tube (326) is integrally formed and connected between the first inner sealing cylinder (321) and the second inner sealing cylinder (325). The first inner sealing cylinder (321) is inserted into the inside of the pipe body (100), the second inner sealing cylinder (325) is inserted into the inside of the second threaded cylinder (510), and the leak detection tube (326) is set between the second threaded cylinder (510) and the pipe body (100); The inner sealing component (320) further includes an inner partition (322) sleeved on the outer wall of the top end of the first inner sealing cylinder (321), and an outer partition (324) sleeved on the outer wall of the bottom end of the second inner sealing cylinder (325). The top end of the tube body (100) is inserted between the inner wall of the inner partition (322) and the outer wall of the first inner sealing cylinder (321), and the outer partition (324) is inserted into the first threaded cylinder (410). The inner sealing component (320) also includes a sealing ring (323) fixed between the bottom outer wall of the inner partition (322) and the bottom of the outer partition (324). A sealing ring (327) is fixed between the bottom surface of the sealing ring (323) and the bottom of the inner partition (322). The sealing ring (323) is fitted between the bottom of the first threaded cylinder (410) and the inner wall of the outer sealing cylinder (310). The sealing ring (327) is fitted between the outer wall of the tube body (100) and the inner wall of the outer sealing cylinder (310).

2. The hydrogen conveying and filling metal hose according to claim 1, characterized in that: The sealing assembly (300) also includes a one-way inlet valve (330) and a hydrogen sensor (340). The one-way inlet valve (330) and the hydrogen sensor (340) are both connected through the outer sealing cylinder (310) and the sealing ring (323). The inner partition cylinder (322), the outer partition cylinder (324), the sealing ring (323) and the leak detection tube (326) cooperate to form an inner cavity structure. One end of the one-way inlet valve (330) and the detection end of the hydrogen sensor (340) are both located inside the inner cavity so that the detection end of the hydrogen sensor (340) is correspondingly set with the leak detection tube (326).

3. The hydrogen conveying and filling metal hose according to claim 2, characterized in that: Two guide ribs (329) are fixed between the outer wall of the inner diaphragm (322) and the inner wall of the outer diaphragm (324). The two guide ribs (329) cooperate to form a guide channel, and the detection end of the hydrogen sensor (340) is guided to extend into the top of the inner cavity through the guide channel.

4. The hydrogen conveying and filling metal hose according to claim 1, characterized in that: The tube body (100) is composed of an end tube (130), multiple straight tubes (110), and corrugated rings (120). The multiple straight tubes (110) and the multiple corrugated rings (120) are connected at intervals. The top end of the straight tube (110) is connected to the end tube (130) through it. The end tube (130) has an inverted funnel-shaped structure.

5. A metal hose for hydrogen delivery and filling according to claim 4, characterized in that: The bottom end of the outer sealing cylinder (310) is connected to the docking cylinder (311). The outer wall of the docking cylinder (311) is fixed with a retaining ring (312). The clamping ring (200) is composed of two semi-circular arc-shaped clamps (210). The inner wall of the clamp (210) is provided with a first clamping groove (211) and a second clamping groove (212). The straight pipe (110) and the docking cylinder (311) are jointly fitted with the clamp (210). The corrugated ring (120) is inserted into the first clamping groove (211), and the retaining ring (312) is inserted into the second clamping groove (212).

6. A metal hose for filling hydrogen gas according to claim 4, characterized in that: The bottom end of the first inner sealing cylinder (321) is connected to a plurality of baffles (328). The plurality of baffles (328) are fitted together and cooperate with the first inner sealing cylinder (321) to form an inverted funnel-shaped structure. The baffles (328) are fitted together to the inner wall of the inverted funnel-shaped structure of the end tube (130).

7. A metal hose for hydrogen delivery and filling according to claim 4, characterized in that: The end tube (130) has two positioning posts (131) fixed on its inclined outer wall. The inner wall of the sealing ring (327) is an inverted funnel structure. The sealing ring (327) fits against the inclined outer wall of the end tube (130). The inner wall of the sealing ring (327) has two fixed slots (3271). The positioning posts (131) are inserted into the fixed slots (3271).

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