A corrosion-resistant hydrogen transmission pipeline

Abstract

The present invention discloses an anti-corrosion hydrogen transmission pipeline, which relates to the field of pipeline connection. The pipeline comprises a plurality of pressure-resistant inner tubes connected in sequence along the axial direction, wherein the inner wall of the pressure-resistant inner tube is coated with an anti-corrosion coating, and the outer side of the pressure-resistant inner tube is provided with a barrier tube and an outer protective tube in sequence; two connecting rings are respectively provided at both ends of the pressure-resistant inner tube; a corrugated inner tube is located between two adjacent pressure-resistant inner tubes and is located on the side where the two connecting rings are close to each other and is connected to the connecting rings; the connecting ring is fixed with a transition tube located on the inner side of the corrugated inner tube; the two transition tubes in the same corrugated inner tube are nested with each other and connected with relative sliding along the axial direction; the gap between the transition tube and the corrugated inner tube constitutes a sealed first cavity; an air pressure balance member is provided in the first cavity, and the air pressure balance member is used to keep the air pressure in the first cavity balanced; the connecting ring, the corrugated inner tube and the outer side of the transition tube are all coated with an anti-corrosion coating. The present application has the effect of improving the pipeline's ability to cope with thermal expansion and contraction.

Description

Technical Field

[0001] The present invention relates to the field of pipeline connection, in particular to an anti-corrosion hydrogen transmission pipeline. Background Art

[0002] As a clean energy source, hydrogen has a wide range of applications in various fields. When transporting hydrogen continuously over long distances, it is usually necessary to transmit it through dedicated pipelines. However, hydrogen has high permeability and strong reducing properties, which can easily cause hydrogen embrittlement and corrosion in pipeline materials, leading to leakage and even explosion risks. To address the corrosion problem of hydrogen pipelines, the following solutions are mainly adopted: 1. Use stainless steel or nickel-based alloy materials. These materials have good hydrogen embrittlement resistance, but are expensive and difficult to process. 2. Apply an anti-corrosion coating, such as epoxy resin or polyurethane coating, to the inner wall of the pipeline. This method can delay corrosion to a certain extent, but the coating is easy to peel off and lacks durability.

[0003] For related technology, please refer to the Chinese patent announcement number CN217030269U, which discloses a hydrogen delivery pipe and a hydrogen delivery pipeline. The steel pipe body of the hydrogen delivery pipe has a tube cavity with a circular cross-section, and the inner wall of the tube cavity of the steel pipe body is provided with a nano-composite coating for preventing hydrogen atoms from diffusing into the steel pipe body; the outer diameter of the steel pipe body is not greater than 100 mm, and the tube cavity diameter of the steel pipe body is not greater than 90 mm. The nano-composite coating can effectively prevent hydrogen atoms from penetrating and diffusing into the steel pipe body to avoid hydrogen embrittlement of the steel pipe body, so that only ordinary steel pipes used to manufacture natural gas transmission pipelines can be used to manufacture pipes capable of transporting hydrogen, effectively reducing the cost of hydrogen transportation.

[0004] Regarding the above-mentioned related technologies, when transporting hydrogen over long distances, large-span pipelines are also required, and such pipelines are usually in outdoor environments. When the external ambient temperature changes, the pipeline itself is also prone to thermal expansion and contraction due to temperature changes. During the thermal expansion and contraction process, the welds or connection structures at the pipeline joints are prone to stress concentration, which in turn causes the seal at the joints to fail, thereby causing hydrogen leakage. Therefore, in the existing technology, a bending structure is set on the pipeline along a preset distance to absorb the length change caused by the thermal expansion and contraction of the pipeline through the natural bending of the pipeline. However, in the curved pipe section, when the straight part of the pipeline expands and contracts, it will cause the curved pipe section of the pipeline to deform. When there is a gap between the elongation of the anti-corrosion coating and the pipeline itself, the anti-corrosion coating is easy to peel off from the pipeline during the deformation of the pipeline, thereby causing corrosion of the pipeline at the coating peeling location. Therefore, there is an urgent need for a pipeline structure to improve the pipeline's ability to cope with thermal expansion and contraction. Summary of the Invention

[0005] In order to improve the pipeline's ability to cope with thermal expansion and contraction, the present application provides a corrosion-resistant hydrogen pipeline.

[0006] This application provides a corrosion-resistant hydrogen pipeline, which adopts the following technical solutions:

[0007] A corrosion-resistant hydrogen transmission pipeline comprises a plurality of pressure-resistant inner tubes connected in sequence along the axial direction, wherein the inner wall of the pressure-resistant inner tube is coated with an anti-corrosion coating, and further comprises: a barrier tube, which is coated on the outer side of the pressure-resistant inner tube and is made of an anti-permeation material for preventing hydrogen from penetrating; an outer protective tube, which is coated on the outer side of the barrier tube and is used to protect the barrier tube; two connecting rings, which are respectively arranged at both ends of the pressure-resistant inner tube, and a connecting portion is provided on the side of the connecting ring close to the internal pressure inner tube, and the connecting ring is connected to the pressure-resistant inner tube through the connecting portion; a corrugated inner tube, which is located between two adjacent pressure-resistant inner tubes and is at the mutual connection between the two connecting rings On the side close to the bellows, both ends of the bellows inner tube are provided with welding parts, and the bellows inner tube is fixedly connected to the connecting ring through the welding parts. A transition pipe is fixedly provided on the side of the connecting ring close to its own axis. The transition pipe is located on the inner side of the bellows inner tube, and the two transition pipes in the same bellows inner tube are nested with each other and connected by sliding along the axial direction. The gap between the transition pipe and the bellows inner tube constitutes a closed first cavity. An air pressure balance part is provided in the first cavity. When the volume of the first cavity changes, the air pressure balance part is used to keep the air pressure in the first cavity balanced. The connecting ring, the bellows inner tube and the outer side of the transition pipe are all coated with an anti-corrosion coating.

[0008] By adopting this technical solution, the pressure-resistant inner tube carries high-pressure hydrogen. The anti-corrosion coating improves the corrosion resistance of the pressure-resistant inner tube, connecting ring, corrugated inner tube, and transition ring. The barrier tube prevents hydrogen permeation, while the outer protective tube provides external protection for the barrier tube and the pressure-resistant inner tube. The pressure-resistant inner tube is connected to the corrugated inner tube via the connecting ring. The corrugated inner tube connects the two adjacent pressure-resistant inner tubes and creates a movable space between them. The transition pipe is used to guide hydrogen through the corrugated inner pipe and prevent hydrogen from contacting the inner wall of the corrugated inner pipe during high-speed flow, thereby reducing the probability that the uneven inner wall of the corrugated inner pipe interferes with the stability of the hydrogen flow. When the pressure-resistant inner pipe expands or contracts due to thermal expansion and contraction, the two connecting rings move closer to or farther away from each other, thereby causing the corrugated inner pipe to deform. During this process, the volume of the first cavity changes. The air pressure in the first cavity is adjusted by the air pressure balance member to keep the air pressure in the first cavity stable, thereby reducing the probability of hydrogen penetrating into the first cavity due to the pressure difference or the gas in the first cavity entering and mixing with the hydrogen. By setting up the corrugated inner pipe, activity space is provided for the thermal expansion and contraction of the pressure-resistant inner pipe, and by setting up the transition pipe, the influence of the pressure-resistant inner pipe on the hydrogen flow is reduced, thereby improving the overall ability of the pipeline to cope with thermal expansion and contraction.

[0009] Optionally, the connecting ring includes an inner ring, an outer ring and a fixed ring, the inner ring is located on the inner side of the pressure-resistant inner tube, and the outer circle of the inner ring is fitted with the outer circle of the internal pressure inner tube, the outer ring is sleeved on the outside of the inner ring and fixedly connected to the inner ring through the fixed ring, the outer ring is located on the outside of the outer protective tube and is fitted with the outer protective tube, the connecting part includes a locking clamp, a positioning block and a tightening screw, the locking clamp is sleeved and locked on the outside of the outer protective tube, the positioning block is fixedly connected to the outer circle of the locking clamp, and the positioning block is provided with a through groove along the radial direction of the locking clamp, one end of the tightening screw is fixedly connected to the outer ring, and the other end passes through the through groove and is threadedly connected to a locking nut.

[0010] By adopting the above technical solution, the fixing ring supports and fixes the outer ring and the inner ring, so that the outer ring and the inner ring cooperate to cover the entire pipeline from the inside and outside. At the same time, the locking clamp can be easily disassembled and connected to the outer protective tube at any time. When the locking clamp is connected to the outer protective tube, by tightening the locking nut, under the support of the positioning block, the locking nut drives the tightening screw to move along the axis of the through hole, thereby driving the fixing ring to fit with the end of the pressure-resistant inner tube, which is beneficial to improving the air tightness of the connection between the connecting ring and the pressure-resistant inner tube.

[0011] Optionally, an annular groove is provided on the outer circle of the inner ring along the circumferential direction, and a flow groove connected to the annular groove is provided along the radial direction. The outer ring and the fixed ring are both provided with a perfusion hole connected to the flow groove along the radial direction. The flow groove is connected to the outside world through the perfusion hole. The annular groove is filled with adhesive, and the adhesive is injected into the annular groove through the perfusion hole and the flow groove through pressure. An exhaust hole connected to all the annular grooves is provided on the side of the inner ring away from the flow groove, and the exhaust hole is connected to the outside world at one end away from the annular groove.

[0012] By adopting the above technical solution, after the connecting ring is installed on the end of the pressure-resistant inner tube, adhesive is fed into the through-flow groove through the pouring hole, allowing the adhesive to flow along the through-flow groove into the annular groove. During the pouring process, gas in the ring and through-flow groove is discharged through the exhaust hole. The adhesive flows along the annular groove, and when the adhesive solidifies, it connects the inner ring to the pressure-resistant inner tube, thereby further improving the connection strength and airtightness between the pressure-resistant inner tube and the inner ring.

[0013] Optionally, the welding part includes a straight pipe and a welding ring, the straight pipe is fixedly connected to one end of the sealing bellows and communicates with the sealing bellows, the welding ring is fixed to the end of the straight pipe away from the sealing bellows, and a support pipe is fixed on the side of the fixed ring away from the corresponding pressure-resistant inner tube. The welding ring and the branch pipe are both sleeved on the outside of the support pipe and fit with the support pipe. The thickness of the welding ring is greater than the thickness of the branch pipe, and is fixedly connected to the fixed ring by welding.

[0014] By adopting this technical solution, the retaining ring supports the straight tube via the support tube, thereby improving the connection strength between the corrugated inner tube and the connecting ring. At the same time, the straight tube is connected to the retaining ring via a welding ring, further improving the airtightness of the connection between the straight tube and the connecting ring.

[0015] Optionally, a spiral groove is opened circumferentially on the outer circle of the support tube, and the straight tube is provided with a spiral protrusion adapted to the spiral groove, the spiral protrusion is located in the spiral groove and fits against the inner wall of the spiral groove, a positioning ring is provided on the outer side of the straight tube, and the spiral protrusion is formed by pressing and concavely forming a spiral groove adapted to the spiral protrusion on the outer circle of the straight tube, the positioning ring is located at one end of the straight tube away from the welding ring and is fixedly connected to the straight tube, a locking rope is fixedly connected to the side of the positioning ring close to the welding ring, the locking rope is wrapped around the straight tube along the spiral groove, and is tightened in the direction close to the axis of the straight tube, and the fixing ring is provided with a fixing part for positioning the locking rope.

[0016] By adopting the above technical solution, the support tube limits the spiral protrusion through the spiral groove, thereby improving the air tightness while improving the connection stability between the straight tube and the support tube. At the same time, under the action of the positioning ring and the fixing part, the straight tube is further tightened along the spiral groove through the locking rope, further pushing the spiral protrusion to fit the inner wall of the spiral groove, thereby further improving the air tightness between the straight tube and the support tube. At the same time, there is no need to fully weld the straight tube and the support tube, which improves the installation convenience and reduces the probability of the anti-corrosion coating being damaged by the high temperature generated during the welding process.

[0017] Optionally, the fixing member includes a connecting plate, a positioning plate and a locking screw. The positioning plate is fixedly connected to the fixing ring and has a straight hole radially opened along the positioning plate. The connecting plate is located on one side of the positioning plate. The locking screw is fixedly connected to the side of the connecting plate close to the positioning plate, and the locking screw passes through the straight hole and is threadedly connected to a positioning nut. The connecting plate is provided with a card interface adapted to the locking rope along the circumferential side. The locking rope is located in the card interface and is connected to the connecting plate.

[0018] By adopting the above technical solution, the connecting plate limits the locking rope through the card interface. When the positioning nut is tightened, the positioning nut drives the connecting plate closer to the positioning plate through the locking screw, and then the connecting plate drives the locking rope to tighten, which makes it more convenient to tighten the locking rope.

[0019] Optionally, the transition pipe is divided into an inner pipe and an outer pipe, the inner pipe is located inside the outer pipe, the air pressure balance part includes a sliding ring 1 and a sliding ring 2, the sliding ring 1 is fixedly connected to the side of the inner pipe away from the corresponding connecting ring, the outer diameter of the sliding ring 1 is larger than the outer diameter of the inner pipe, and the outer circle of the sliding ring 1 fits with the inner wall of the outer pipe, the sliding ring 2 is coaxially arranged at the end of the outer pipe away from the corresponding connecting ring, the inner diameter of the sliding ring 2 is adapted to the outer diameter of the inner pipe, the gap between the sliding ring 1 and the sliding ring 2 constitutes a second cavity, and the sliding ring 2 is provided with an air duct connecting the first cavity with the second cavity.

[0020] By adopting the above technical solution, the inner tube and the outer tube cooperate to block the corrugated inner tube. When the connecting rings at both ends of the same corrugated inner tube approach each other, the corrugated inner tube is compressed and the volume of the first cavity is reduced. At this time, the sliding ring 1 and the sliding ring 2 are away from each other, so that the volume of the second cavity increases. Under the action of the air duct, the gas in the first cavity enters the second cavity, and then the gas pressure in the first cavity is adjusted, which is beneficial to reduce the probability of hydrogen penetrating into the first cavity during the transportation process.

[0021] Optionally, two semicircular tubes are provided on the outside of the corrugated inner tube, and the two semicircular tubes are symmetrically arranged with the axis of the corrugated inner tube as the center. Among the two outer rings between the two pressure-resistant inner tubes, any outer ring is provided with an outer circular groove along the circumferential direction, and an arc-shaped plate adapted to the outer circular groove is fixed at one end of the semicircular tube along the axial direction. The arc-shaped plate is located in the outer circular groove and fits with the inner wall of the outer circular groove. A locking bolt is provided between the two semicircular tubes, and the locking bolt passes through any semicircular tube and is threadedly connected to the other semicircular tube.

[0022] By adopting the above technical solution, the two semicircular tubes are connected by locking bolts. Between the two pressure-resistant inner tubes, any connecting ring limits the arc plate of the semicircular tube through the outer circular groove, so that when the connecting ring moves, the semicircular tube is driven to move. The semicircular tube protects the corrugated inner tube and reduces the probability of damage to the corrugated inner tube.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The pressure-resistant inner tube carries high-pressure hydrogen. The anti-corrosion coating improves the corrosion resistance of the pressure-resistant inner tube, connecting ring, corrugated inner tube, and transition ring. The barrier tube prevents hydrogen permeation, while the outer protective tube provides external protection for the barrier tube and pressure-resistant inner tube. The pressure-resistant inner tube is connected to the corrugated inner tube via the connecting ring. The corrugated inner tube connects the two adjacent pressure-resistant inner tubes and creates a space between them for movement. The transition pipe is used to guide hydrogen through the corrugated inner pipe and prevent hydrogen from contacting the inner wall of the corrugated inner pipe during high-speed flow, thereby reducing the probability that the uneven inner wall of the corrugated inner pipe interferes with the stability of hydrogen flow. When the pressure-resistant inner pipe expands or contracts due to heat and cold, the two connecting rings move closer to or farther away from each other, thereby causing the corrugated inner pipe to deform. During this process, the volume of the first cavity changes. The air pressure in the first cavity is adjusted by the air pressure balance member to keep the air pressure in the first cavity stable, thereby reducing the probability of hydrogen penetrating into the first cavity due to the pressure difference or the gas in the first cavity entering and mixing with the hydrogen. By providing the corrugated inner pipe, room is provided for the thermal expansion and contraction of the pressure-resistant inner pipe, and by providing the transition pipe, the influence of the pressure-resistant inner pipe on the hydrogen flow is reduced, thereby improving the overall ability of the pipeline to cope with thermal expansion and contraction.

[0025] 2. The inner tube and the outer tube cooperate to block the corrugated inner tube. When the connecting rings at both ends of the same corrugated inner tube approach each other, the corrugated inner tube is compressed and the volume of the first cavity decreases. At this time, the sliding ring 1 and the sliding ring 2 move away from each other, causing the volume of the second cavity to increase. Under the action of the air duct, the gas in the first cavity enters the second cavity, thereby regulating the gas pressure in the first cavity, which helps to reduce the probability of hydrogen penetrating into the first cavity during the transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0027] Figure 2 This is a schematic diagram intended to highlight the connection structure of the corrugated inner tube.

[0028] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0029] Figure 4 This is a schematic diagram intended to highlight the structure of the fixture.

[0030] Explanation of the accompanying symbols: 1. Pressure-resistant inner tube; 2. Barrier tube; 3. Outer protective tube; 4. Connecting ring; 41. Inner ring; 411. Annular groove; 412. Through-flow groove; 42. Outer ring; 421. Infusion hole; 422. Exhaust hole; 423. Outer circular groove; 424. Mounting block; 425. Positioning screw; 426. Limit nut; 43. Fixing ring; 431. Support tube; 432. Spiral groove; 44. Connecting part; 441. Locking clamp; 442. Positioning block; 443. Tensioning screw; 444. Through-groove; 445. Locking nut ;46. Fixing part;461. Connecting plate;462. Positioning plate;463. Locking screw;464. Card interface;465. Positioning nut;5. Corrugated inner tube;511. Straight tube;512. Welding ring;513. Spiral protrusion;514. Positioning ring;515. Locking rope;61. Inner tube;62. Outer tube;7. Air pressure balance part;71. Sliding ring 1;72. Sliding ring 2;721. Air duct;81. Semicircular tube;811. Arc plate;812. Limiting plate;813. Opening groove;82. Locking bolt. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0032] The embodiments of the present application disclose a corrosion-resistant hydrogen transmission pipeline.

[0033] Example:

[0034] Reference Figure 1 and Figure 2 A corrosion-resistant hydrogen transmission pipeline comprises several pipe sections connected end-to-end. From the inside out, the sections comprise a pressure-resistant inner tube 1, a barrier tube 2, and an outer protective tube 3. The pressure-resistant inner tube 1 is made of a high-strength alloy material, such as stainless steel. The inner wall of the pressure-resistant inner tube 1 is coated with an anti-corrosion coating to improve its corrosion resistance and hydrogen embrittlement resistance, thereby enhancing its operational stability.

[0035] Reference Figure 1 and Figure 2 The barrier tube 2 is made of an anti-permeation material, such as aluminum, which has good anti-leakage performance and is conducive to preventing the penetration of hydrogen. The outer protective tube 3 is made of a polymer material, such as polyethylene, which provides external protection for the barrier tube 2 and the pressure-resistant tube, reducing the probability of damage to the barrier tube 2 and the pressure-resistant tube.

[0036] Reference Figure 2 and Figure 3Adjacent pipe sections are connected via a corrugated inner tube 5, and each lengthwise end of the pipe section is provided with a connecting ring 4 for connecting to the corrugated inner tube 5. The connecting ring 4 comprises an inner ring 41, an outer ring 42, and a fixing ring 43. The outer ring 42 is coaxially sleeved on the outside of the inner ring 41 and fixedly connected to the inner ring 41 via the fixing ring 43. The gap between the inner ring 41 and the outer ring 42 is adapted to the combined wall thickness of the pressure-resistant inner tube 1, the barrier tube 2, and the outer protective tube 3. When the connecting ring 4 is connected to the pipe section, the inner ring 41 is located inside the pressure-resistant inner tube 1 and fits in contact with it, while the outer ring 42 is located outside the outer protective tube 3 and fits in contact with it.

[0037] Reference Figure 2 and Figure 3 The corrugated inner tube 5 is located on the side of the fixing ring 43 that is away from the corresponding pipe section, and a welding portion is provided at both ends of the corrugated inner tube 5. The welding portion includes a straight tube 511 and a welding ring 512. The straight tube 511 is integrally formed with the corrugated inner tube 5, and the welding ring 512 is fixedly connected to the side that is directly away from the corrugated inner tube 5. The side of the fixing ring 43 close to the corrugated inner tube 5 is fixedly connected to the support tube 431. The straight tube 511 and the welding ring 512 are both sleeved on the outside of the support tube 431, and the welding ring 512 is fixedly connected to the fixing ring 43 by welding.

[0038] Reference Figure 2 and Figure 3 For ease of processing, the wall thickness of the straight tube 511 should not be too high, which makes it difficult to connect it to the fixing ring 43 directly by welding. The welding ring 512 is conducive to increasing the connection area between the straight tube 511 and the fixing ring 43, while improving the airtightness between the straight tube 511 and the fixing ring 43, and at the same time improving the airtightness between the straight tube 511 and the fixing ring 43, it also improves the airtightness between the straight tube 511 and the support tube 431.

[0039] Reference Figure 2 and Figure 3 The support tube 431 is circumferentially formed with a spiral groove 432. The straight tube 511 is formed with a spiral protrusion 513, which is formed by pressing and matching the spiral groove 432. The spiral protrusion 513 is located within the spiral groove 432 and fits closely to the inner wall of the spiral groove 432, further improving the stability and airtightness of the connection between the support tube 431 and the straight tube 511. The side of the straight tube 511 near the corrugated inner tube 5 is fixedly connected to a positioning ring 514 by welding or gluing. The side of the positioning ring 514 near the welding ring 512 is fixedly connected to a locking rope 515. The locking rope 515 is specifically a steel wire rope with good flexibility and strength.

[0040] Reference Figure 3 and Figure 4A fixing member 46 is provided on the side of the fixing ring 43 proximal to the corrugated inner tube 5. This fixing member 46 comprises a connecting plate 461, a positioning plate 462, and a locking screw 463. The positioning plate 462 is fixedly connected to the fixing ring 43 and has a straight hole extending therethrough. The connecting plate 461 is located on one side of the positioning plate 462 along the axis of the straight hole and is slidably connected to the connecting plate 461 along the axis of the straight hole. The locking screw 463 is fixedly connected to the connecting plate 461. Movement of the locking screw 463 drives movement of the connecting plate 461. The locking screw 463 passes through the straight hole and is threadedly connected to a positioning nut 465.

[0041] Reference Figure 3 and Figure 4 The connecting plate 461 has a latching interface 464 formed in the transverse direction. The end of the locking rope 515 away from the positioning ring 514 is fixedly connected to a latching block, which passes through the latching interface 464 and latches with the connecting plate 461. When the positioning nut 465 is rotated, the positioning nut 465 drives the connecting plate 461 toward the positioning plate 462 via the locking screw 463. A spiral groove is formed on the side of the spiral protrusion 513 facing away from the support tube 431. The locking rope 515 is wound around the straight tube 511 along the spiral groove. When the connecting plate 461 moves, the locking rope 515 is tightened, causing the locking rope 515 to squeeze the straight tube 511, further improving the connection stability and airtightness between the straight tube 511 and the support tube 431.

[0042] Reference Figure 2 and Figure 3 A transition pipe is also provided on the inside of the corrugated inner tube 5. The transition pipe includes an inner tube 61 and an outer tube 62. An air pressure balance member 7 is provided between the inner tube 61 and the outer tube 62. The inner tube 61 and the outer tube 62 are respectively fixedly connected to the two fixing rings 43 on both sides of the corrugated inner tube 5, and the outer tube 62 is sleeved on the outside of the inner tube 61. When the fixing ring 43 moves, the corresponding inner tube 61 or outer tube 62 is driven to move relative to each other.

[0043] Reference Figure 2The air pressure balance member 7 includes a first sliding ring 71 and a second sliding ring 72. The first sliding ring 71 is fixedly connected to the end of the inner tube 61 away from the corresponding fixed ring 43, and the outer circumference of the first sliding ring 71 is in contact with the inner wall of the outer tube 62. The second sliding ring 72 is fixedly connected to the side of the inner tube 61 away from the corresponding fixed ring 43, and the inner wall of the second sliding ring 72 is in contact with the outer circumference of the inner tube 61. When the two connecting rings 4 on both sides of the same corrugated inner tube 5 approach each other, the first sliding ring 71 and the second sliding ring 72 move away from each other. The inner tube 61, the outer tube 62 outer wall and the inner wall of the corrugated inner tube 5 form a first closed cavity, the gap between the sliding ring 1 71 and the sliding ring 2 72 constitutes a second cavity, and the sliding ring 2 72 is provided with an air duct 721 connecting the first cavity and the second cavity. When the two connecting rings 4 move relative to each other, the volume of the first cavity decreases, and the volume of the second cavity increases synchronously. Under the connecting action of the ventilation groove, the overall volume change of the first cavity and the second cavity remains relatively stable, which is conducive to balancing the air pressure in the first cavity.

[0044] Reference Figure 1 and Figure 2 Two coaxially arranged semicircular tubes 81 are also disposed outside the corrugated inner tube 5. Both semicircular tubes 81 are located outside the corrugated inner tube 5 and are arranged opposite each other. Multiple locking bolts 82 are positioned between the two semicircular tubes 81. These locking bolts 82 pass through one semicircular tube 81 and threadably connect to the other semicircular tube 81. Both semicircular tubes 81 have connecting edges for receiving the locking bolts 82. The provision of these locking bolts 82 facilitates assembly and disassembly of the two semicircular tubes 81.

[0045] Reference Figure 2 and Figure 4 Among the two outer rings 42 at both ends of the same corrugated inner tube 5, an outer circular groove 423 is opened on the outer circle of any outer ring 42 along the circumferential direction, and an arc-shaped plate 811 adapted to the outer circular groove 423 is fixedly connected at one end of the semi-circular tube along the axial direction. When the two semi-circular tubes 81 are assembled, the arc-shaped plate 811 is located in the outer circular groove 423 and is slidably connected to the corresponding outer ring 42 along the length direction of the outer circular groove 423.

[0046] Reference Figure 2 and Figure 3The end of the semicircular tube 81 away from the arc-shaped plate 811 is fixedly connected to a limit plate 812. The limit plate 812 has an open groove 813 along the circumference of the semicircular plate. The outer ring 42 away from the arc-shaped plate 811 is fixedly connected to a mounting block 424. A positioning screw 425 is fixedly provided on the side of the mounting block 424 close to the semicircular tube 81. When the semicircular tube 81 is rotated, the semicircular tube drives the limit plate 812 to move closer to or away from the positioning screw 425. In the initial state, the positioning screw 425 is located in the open groove 813. Two limit nuts 426 are provided along the length of the positioning screw 425. The limit nuts 426 are threadedly connected to the positioning screw 425. In the initial state, the two limit nuts 426 are respectively located on both sides of the limit plate 812 and fit the limit plate 812.

[0047] Reference Figure 2 and Figure 3 For the two outer rings 42 at both ends of the corrugated inner tube 5, one of the outer rings 42 limits the arc groove through the outer circular groove 423, and the other outer ring 42 limits the limiting plate 812 through the positioning screw 425 and the limiting nut 426, and then limits the relative movement between the two connecting rings 4 through the semicircular tube 81. Before the connecting rings 4 are assembled with the corresponding pipe sections, the two connecting rings 4 are in a positioning state, which is conducive to improving the installation convenience of the connecting rings 4. After the installation of the connecting rings 4 is completed, the two limiting nuts 426 are loosened to keep the limiting nuts 426 away from the limiting plate 812. At this time, the restriction between the two connecting rings 4 is released.

[0048] Reference Figure 2 and Figure 3 The connecting ring 4 has a connecting portion 44 on the side facing away from the corrugated inner tube 5. This portion 44 includes a locking clamp 441, a positioning block 442, and a tensioning screw 443. The locking clamp 441 is sleeved onto the outside of the outer protective tube 3 and locked to the outer protective tube 3. The clamp is conventional and will not be described in detail. Multiple positioning blocks 442 are provided and fixedly connected to the clamp along its circumference. The locking clamp 441 is tightened onto the outer protective tube 3 to secure the positioning blocks 442.

[0049] Reference Figure 2 and Figure 3 The positioning block 442 has a through slot 444 formed along the axis of the locking clamp 441. The tightening screw 443 corresponds to the positioning block 442 one-to-one. One end of the tightening screw 443 is fixedly connected to the outer ring 42, and the other end passes through the through slot 444 and is threadedly connected to the locking nut 445. When the locking nut 445 is tightened, the locking nut 445 fits against the end face of the positioning block 442 facing away from the outer ring 42, and the tightening screw 443 drives the outer ring 42 closer to the locking clamp 441, which helps to push the fixing ring 43 into contact with the end of the pipe section, thereby improving the connection stability between the connecting ring 4 and the pipe section.

[0050] Reference Figure 2 and Figure 3 The outer surface of the inner ring 41 is circumferentially formed with annular grooves 411. Furthermore, the inner ring 41 is axially formed with through-flow grooves 412 that connect all of the annular grooves 411. The through-flow grooves 412 extend toward the fixed ring 43. Both the outer ring 42 and the fixed ring 43 are radially formed with injection holes 421 that communicate with the through-flow grooves 412. Initially, the semicircular tube 81 blocks the injection holes 421, thereby preventing external debris from entering the injection holes 421. After the connecting ring 4 is connected to the corresponding pipe section via the connecting portion 44, the semicircular tube 81 is removed, allowing the annular grooves 411 to communicate with the outside world through the through-flow grooves 412 and the injection holes 421.

[0051] Reference Figure 2 and Figure 3 , an adhesive is injected into the flow groove 412 through the injection hole 421. The adhesive is specifically selected as Tritonex, which has good resistance to hydrogen corrosion. The adhesive enters the annular groove 411 along the flow groove 412 and flows along the annular groove 411. When the adhesive solidifies, it bonds the inner ring 41 and the pressure-resistant inner tube 1, thereby improving the connection strength between the inner ring 41 and the pressure-resistant inner tube 1 and further improving the airtightness between the inner ring 41 and the pressure-resistant inner tube 1. The outer ring 42 and the fixed ring 43 are also provided with an exhaust hole 422 at one end away from the injection hole 421. During the injection process, the gas in the annular groove 411 and the flow groove 412 is discharged through the exhaust hole 422, which is conducive to improving the convenience of injection. The entire connecting ring 4, the transition ring and the outer side of the corrugated inner tube 5 are coated with an anti-corrosion coating to resist the corrosion and penetration of hydrogen.

[0052] The working principle of a corrosion-resistant hydrogen pipeline in the embodiment of the present application is as follows: two adjacent pipe sections are connected to the corrugated inner tube 5 through a connecting ring 4. The corrugated inner tube 5 provides a movable gap between the two pipe sections. When the pipe section undergoes thermal expansion and contraction and causes the length of the pipe section to change, the corrugated inner tube 5 stretches or compresses, thereby automatically adapting to the change in the length of the pipe section. At the same time, the connecting ring 4 separates the corrugated inner tube 5 from the hydrogen transported in the pipe section through the inner tube 61 and the outer tube 62, which helps to reduce the probability that the hydrogen is affected by the unevenness of the inner wall of the corrugated inner tube 5 when moving at high speed. At the same time, the second cavity formed between the sliding ring 1 71 and the sliding ring 2 72 is connected to the first cavity inside the corrugated inner tube 5. When the length of the corrugated inner tube 5 changes, the air pressure change in the first cavity is automatically adjusted through the second cavity, thereby reducing the probability of hydrogen penetrating into the first cavity, thereby improving the overall ability of the pipeline to cope with thermal expansion and contraction.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A corrosion-resistant hydrogen transmission pipeline, comprising a plurality of pressure-resistant inner tubes (1) connected in sequence along the axial direction, wherein the inner wall of the pressure-resistant inner tube (1) is coated with an anti-corrosion coating, and is characterized in that: The device further comprises: a barrier tube (2), which is coated on the outside of the pressure-resistant inner tube (1) and is made of an anti-permeation material and is used to prevent hydrogen from permeating; an outer protective tube (3), which is coated on the outside of the barrier tube (2) and is used to protect the barrier tube (2); two connecting rings (4), which are respectively arranged at both ends of the pressure-resistant inner tube (1), and a connecting portion (44) is provided on the side of the connecting ring (4) close to the internal pressure inner tube, and the connecting ring (4) is connected to the pressure-resistant inner tube (1) through the connecting portion (44); a corrugated inner tube (5), which is located between two adjacent pressure-resistant inner tubes (1) and is located on the side where the two connecting rings (4) are close to each other, and the two ends of the corrugated inner tube (5) are connected to each other. The ends are provided with welding parts, and the corrugated inner tube (5) is fixedly connected to the connecting ring (4) through the welding parts. A transition pipe is fixedly provided on the side of the connecting ring (4) close to its own axis. The transition pipe is located on the inner side of the corrugated inner tube (5), and the two transition pipes in the same corrugated inner tube (5) are nested with each other and connected by sliding along the axial direction. The gap between the transition pipe and the corrugated inner tube (5) constitutes a closed first cavity. An air pressure balance member (7) is provided in the first cavity. When the volume of the first cavity changes, the air pressure balance member (7) is used to keep the air pressure in the first cavity balanced. The connecting ring (4), the corrugated inner tube (5) and the outer side of the transition pipe are all coated with an anti-corrosion coating.

2. The corrosion-resistant hydrogen pipeline according to claim 1, characterized in that: The connecting ring (4) comprises an inner ring (41), an outer ring (42) and a fixing ring (43); the inner ring (41) is located inside the pressure-resistant inner tube (1), and the outer circle of the inner ring (41) is in contact with the outer circle of the internal pressure inner tube; the outer ring (42) is sleeved on the outside of the inner ring (41) and is fixedly connected to the inner ring (41) via the fixing ring (43); the outer ring (42) is located outside the outer protective tube (3) and is in contact with the outer protective tube (3); the connecting portion (44) comprises a locking clamp (44 1), a positioning block (442) and a tightening screw (443), a locking clamp (441) is sleeved and locked on the outside of the outer protective tube (3), the positioning block (442) is fixedly connected to the outer circle of the locking clamp (441), and the positioning block (442) is provided with a through groove (444) along the radial direction of the locking clamp (441), one end of the tightening screw (443) is fixedly connected to the outer ring (42), and the other end passes through the through groove (444) and is threadedly connected to a locking nut (445).

3. The corrosion-resistant hydrogen pipeline according to claim 2, characterized in that: The outer circle of the inner ring (41) is provided with an annular groove (411) along the circumferential direction, and a through-flow groove (412) communicating with the annular groove (411) is provided along the radial direction. The outer ring (42) and the fixed ring (43) are both provided with a pouring hole (421) communicating with the through-flow groove (412) along the radial direction. The through-flow groove (412) is communicated with the outside world through the pouring hole (421). The annular groove (411) is filled with an adhesive, and the adhesive is injected into the annular groove (411) through the pouring hole (421) and the through-flow groove (412) by pressure. An exhaust hole (422) communicating with all the annular grooves (411) is provided on a side of the inner ring (411) away from the through-flow groove (412). The exhaust hole (422) is communicated with the outside world at one end away from the annular groove (411).

4. The corrosion-resistant hydrogen pipeline according to claim 2, characterized in that: The welding portion comprises a straight tube (511) and a welding ring (512); the straight tube (511) is fixedly connected to one end of the corrugated inner tube (5) and communicates with the corrugated inner tube (5); the welding ring (512) is fixedly arranged at one end of the straight tube (511) away from the corrugated inner tube (5); a support tube (431) is fixedly arranged on the side of the fixing ring (43) away from the corresponding pressure-resistant inner tube (1); the welding ring (512) and the branch tube are both sleeved on the outside of the support tube (431) and fit with the support tube (431); the thickness of the welding ring (512) is greater than the thickness of the branch tube and is fixedly connected to the fixing ring (43) by welding.

5. The corrosion-resistant hydrogen pipeline according to claim 4, characterized in that: The outer circle of the support tube (431) is provided with a spiral groove (432) along the circumferential direction, the straight tube (511) is provided with a spiral protrusion (513) adapted to the spiral groove (432), the spiral protrusion (513) is located in the spiral groove (432) and is in contact with the inner wall of the spiral groove (432), a positioning ring (514) is sleeved on the outer side of the straight tube (511), and the spiral protrusion (513) is formed by pressing and concave, so that the outer circle of the straight tube (511) forms a spiral protrusion adapted to the spiral protrusion (513). The spiral trough is provided with a positioning ring (514) located at one end of the straight pipe (511) away from the welding ring (512) and fixedly connected to the straight pipe (511). A locking rope (515) is fixedly connected to the side of the positioning ring (514) close to the welding ring (512). The locking rope (515) is wound around the straight pipe (511) along the spiral trough and tightened in a direction close to the axis of the straight pipe (511). The fixing ring (43) is provided with a fixing member (46) for positioning the locking rope (515).

6. The corrosion-resistant hydrogen pipeline according to claim 5, characterized in that: The fixing member (46) includes a connecting plate (461), a positioning plate (462) and a locking screw (463). The positioning plate (462) is fixedly connected to the fixing ring (43) and has a straight hole radially opened along the positioning plate (462). The connecting plate (461) is located on one side of the positioning plate (462). The locking screw (463) is fixedly connected to the side of the connecting plate (461) close to the positioning plate (462). The locking screw (463) passes through the straight hole and is threadedly connected to a positioning nut (465). The connecting plate (461) is provided with a card interface (464) adapted to the locking rope (515) along the circumferential side. The locking rope (515) is located in the card interface (464) and is connected to the connecting plate (461).

7. The corrosion-resistant hydrogen pipeline according to claim 1, characterized in that: The transition pipe is divided into an inner pipe (61) and an outer pipe (62), the inner pipe (61) is located in the outer pipe (62), the air pressure balance member (7) includes a sliding ring (71) and a sliding ring (72), the sliding ring (71) is fixedly connected to the side of the inner pipe (61) away from the corresponding connecting ring (4), the outer diameter of the sliding ring (71) is larger than the outer diameter of the inner pipe (61), and the outer circle of the sliding ring (71) is in contact with the inner wall of the outer pipe (62), the sliding ring (72) is coaxially arranged at the end of the outer pipe (62) away from the corresponding connecting ring (4), the inner diameter of the sliding ring (72) is adapted to the outer diameter of the inner pipe (61), the gap between the sliding ring (71) and the sliding ring (72) constitutes a second cavity, and the sliding ring (72) is provided with an air passage (721) connecting the first cavity with the second cavity.

8. The corrosion-resistant hydrogen pipeline according to claim 2, characterized in that: Two semicircular tubes (81) are provided on the outside of the corrugated inner tube (5). The two semicircular tubes (81) are symmetrically arranged with the axis of the corrugated inner tube (5) as the center. Among the two outer rings (42) between the two pressure-resistant inner tubes (1), any outer ring (42) is provided with an outer circular groove (423) along the circumferential direction. An arc-shaped plate (811) adapted to the outer circular groove (423) is fixed at one end of the semicircular tube (81) along the axial direction. The arc-shaped plate (811) is located in the outer circular groove (423) and fits with the inner wall of the outer circular groove (423). A locking bolt (82) is provided between the two semicircular tubes (81). The locking bolt (82) passes through any semicircular tube (81) and is threadedly connected to the other semicircular tube (81).

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