A seamless bend for hydrogen transportation pipelines

Abstract

This invention discloses a seamless bend for hydrogen transportation pipelines, belonging to the field of pipelines. The bend includes a straight pipe detachably connected to its right end via a pipe connection mechanism. Flanges are fixed to the edges of both the bend and the straight pipe ports. Two half-pipe sleeves are fitted onto the outer surface of the bend, with a fixing ring fixed to the center of the outer surface of each half-pipe sleeve. Grooves are formed on both sides of the outer surfaces of the two fixing rings, and a support mechanism is detachably connected to the outer surfaces of both fixing rings. This invention provides complete coverage of the bend through the half-pipe sleeves, preventing damage from external impacts and providing insulation to prevent flow rate attenuation due to low temperatures during hydrogen transportation, thus stabilizing hydrogen transportation efficiency and extending the bend's service life. The half-ring and extension ring of the support mechanism can be combined to form a circumferential structure greater than 180 degrees, tightly fitting with the fixing rings on the half-pipe sleeves. The support position can be freely adjusted along the fixing rings, providing uniform external support for the bend.

Description

Technical Field

[0001] This invention relates to the field of pipeline technology, and in particular to a seamless bend for hydrogen transportation pipelines. Background Technology

[0002] Hydrogen, as a core medium for the large-scale application of clean energy, boasts advantages such as being clean and pollution-free, and having high energy density, making it an important direction for global energy transition. Hydrogen pipelines, as key infrastructure for the long-distance, large-scale, and safe transportation of hydrogen energy, have operational stability and sealing performance that directly affect the safety and economy of hydrogen energy applications.

[0003] Currently, there are many technical shortcomings in the use of seamless bends in traditional hydrogen transportation pipelines: Firstly, the bend lacks a highly adaptable external support structure (existing supports are mostly for straight pipes). Under different scenarios such as horizontal laying and vertical laying with varying heights, the pipe is prone to stress concentration, which can easily lead to deformation and cracking during long-term operation. Secondly, the bends lack dedicated protection and insulation structures (the insulation and protection structures are mostly insulation cotton sleeves shared with straight pipes), making them susceptible to flow rate reduction due to low ambient temperatures during hydrogen transportation. At the same time, the pipes are easily damaged by external impacts. Third, the connection and fixing of the support components to the bend is complicated (the support mechanism used for straight pipes has low compatibility with bends), and it cannot be quickly disassembled and adjusted in position, resulting in extremely low construction and subsequent maintenance efficiency.

[0004] Therefore, a seamless bend is needed for hydrogen transportation pipelines to address the aforementioned deficiencies in the ease of installation, operational safety, and service life of hydrogen transportation pipelines. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a seamless bend for hydrogen transportation pipelines, solving the problems mentioned in the background section.

[0006] Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a seamless bend for hydrogen transportation pipelines, including a bend and a pipe connection mechanism, wherein a straight pipe is detachably connected to the right end of the bend through the pipe connection mechanism, flanges are fixed to the edges of both the bend and the straight pipe ports, two half-pipe sleeves are fitted on the outer surface of the bend, a fixing ring is fixed in the middle of the outer surface of the half-pipe sleeves, and slots are provided on both sides of the outer surfaces of the two fixing rings, and a support mechanism is detachably connected to the outer surfaces of the two fixing rings. The support mechanism includes a semi-ring component. An inner groove is formed on the inner side of the semi-ring component. A sliding groove is formed at the rear of the inner groove. An extension ring is slidably connected inside the sliding groove. Arc-shaped through slots are formed on both the upper and lower surfaces of the sliding groove. A slider is slidably connected inside the through slot and fixedly connected to the extension ring. An operating arc strip is slidably connected to the outer surface of the semi-ring component. Multiple rotating slots are formed on both sides of the outer surface of the operating arc strip. A locking component is rotatably connected inside each rotating slot. A connecting rod is rotatably connected inside each locking component. Two adjacent connecting rods are rotatably connected to a lifting seat at their opposite ends. A spring is fixedly integrated into the bottom of the lifting seat and the interior of the semi-ring component. A push-pull rod is rotatably connected to the inner side of the lifting seat and the interior of the operating arc strip. A gear is rotatably connected inside the semi-ring component between the operating arc strip and the extension ring.

[0007] Furthermore, the outer surface of the extension ring and the inner side of the operating arc strip are both provided with a plurality of toothed grooves, and the extension ring and the operating arc strip are both connected to the gear through the toothed grooves.

[0008] Furthermore, a connector is fixed to the outer surface of the semi-ring on the outside of the operating arc strip, a rod is rotatably connected inside the connector, and a mounting base is rotatably connected to the top of the rod.

[0009] Furthermore, the first card is located inside the card slot, and the support mechanism is engaged with the fixing ring through the first card and the card slot.

[0010] Furthermore, the pipe connection mechanism includes a sealing ring located on the outer surface of the bend and the straight pipe, and between two adjacent flanges. A collar is fixed to the outer surface of the sealing ring, and the collar is located on the outer surface of the two flanges. A rotating groove is provided on both the left and right sides of the collar. A retaining element is slidably connected inside the rotating groove. A movable groove is provided at both the front and rear sides inside the retaining element. A movable rod is movably connected inside the two movable grooves. A telescopic strip is fixed to the outer surface of the movable rod inside the retaining element. A lead screw is threaded into the two adjacent telescopic strips. A transmission wheel is fixed to the middle of the outer surface of the lead screw. The lead screw is rotatably connected to the inside of the collar. An operating ring is rotatably connected to the outer surface of the collar, and the operating ring is located outside the transmission wheel.

[0011] Furthermore, the outer surface of the transmission wheel is in contact with the inner surface of the operating ring.

[0012] Furthermore, the two clamps on the left and right sides respectively fit against the opposite sides of the two flanges. The pipe connection mechanism realizes the disassembly and connection of the bend and the straight pipe through the clamps and flanges.

[0013] Furthermore, both the semi-ring and the extension ring are fitted to the outer surface of the fixed ring, and the semi-ring and the extension ring together form a semi-circular ring with a degree greater than 180 degrees.

[0014] Furthermore, the two half-tube sleeves are arc-shaped shells adapted to the outer surface of the bend. After being assembled, they fit together with the full arc surface of the outer surface of the bend. The mating edges of the two half-tube sleeves are provided with sealing and fitting surfaces. The two half-tube sleeves form a rigid constraint through a fixing ring. Combined with the arc-shaped structure of the half-tube sleeves themselves, they achieve full enclosure and sealing of the bend.

[0015] The beneficial effects of the seamless bend for hydrogen transportation pipelines of the present invention are as follows: (1) The present invention forms a complete cover for the bend by using a half-pipe sleeve, which not only avoids damage to the pipeline from external impacts, but also has a heat preservation effect, prevents the flow rate from decreasing due to low temperature during hydrogen transportation, stabilizes the hydrogen transportation efficiency, and extends the service life of the bend.

[0016] The semi-ring and extension ring of the support mechanism can be combined to form a circumferential structure of more than 180 degrees, which fits tightly with the fixed ring on the half-pipe sleeve. The support position can be adjusted freely along the fixed ring, providing uniform external support for the bend, effectively dispersing pipeline stress, avoiding deformation and cracking of the bend due to concentrated stress, and greatly improving the strength of the pipeline structure.

[0017] The support mechanism achieves self-locking engagement with the fixed ring through gear meshing and spring return, allowing for quick assembly and disassembly without tools.

[0018] It can flexibly adapt to various laying scenarios such as horizontal placement of bends and vertical height differences, and the support position and angle can be adjusted as needed to meet the installation requirements of different hydrogen transmission pipelines.

[0019] (2) The pipe connection mechanism of the present invention drives the screw drive through the operating ring, which drives the clamping part two to quickly clamp the flange, and cooperates with the sealing ring to realize the high pressure sealing connection between the bend and the straight pipe. The sealing structure is stable and reliable, and avoids hydrogen leakage from the source, fully meeting the high sealing requirements of hydrogen transmission pipeline. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the half-tube sleeve and support mechanism in this invention; Figure 4 This is a schematic diagram of the planar structure of the half-tube sleeve and the support mechanism in this invention; Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure along the BB direction; Figure 6 This is a cross-sectional view of the half-tube sleeve and support mechanism in this invention. Figure 7 For the present invention Figure 6 A magnified structural diagram of point A in the middle; Figure 8 This is a schematic diagram of the support mechanism in this invention; Figure 9 This is a schematic diagram of the pipe connection mechanism in this invention; Figure 10 This is a cross-sectional view of the pipe connection mechanism in this invention; Figure 11 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 12 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0022] In the diagram: 1. Bend; 2. Straight pipe; 3. Flange; 4. Half-pipe sleeve; 5. Fixing ring; 6. Slot; 7. Support mechanism; 8. Pipe connection mechanism; 9. Half-ring; 10. Inner groove; 11. Slide groove; 12. Extension ring; 13. Through groove; 14. Sliding block; 15. Operating arc; 16. Connecting piece; 17. Hanging rod; 18. Mounting seat; 19. Rotary groove one; 20. Clip one; 21. Connecting rod; 22. Lifting seat; 23. Spring; 24. Push-pull rod; 25. Gear; 26. Sealing ring; 27. Collar; 28. Rotary groove two; 29. ​​Clip two; 30. Movable groove; 31. Movable rod; 32. Telescopic strip; 33. Lead screw; 34. Transmission wheel; 35. Operating ring. Detailed Implementation

[0023] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0024] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figures 1-10 A seamless bend for hydrogen transport pipelines includes a bend 1 and a pipe connection mechanism 8. A straight pipe 2 is detachably connected to the right end of the bend 1 through the pipe connection mechanism 8. Flanges 3 are fixed to the edges of the ports of both the bend 1 and the straight pipe 2. Two half-pipe sleeves 4 are fitted on the outer surface of the bend 1. A fixing ring 5 is fixed in the middle of the outer surface of the half-pipe sleeve 4. The two fixing rings 5 ​​have grooves 6 on both sides of their outer surfaces. A support mechanism 7 is detachably connected to the outer surfaces of the two fixing rings 5. The support mechanism 7 includes a semi-ring 9, with an inner groove 10 on the inner side of the semi-ring 9. A sliding groove 11 is formed at the rear of the inner groove 10. An extension ring 12 is slidably connected inside the sliding groove 11. Arc-shaped through grooves 13 are formed on both the upper and lower surfaces of the sliding groove 11. A slider 14 is slidably connected inside the through groove 13. The slider 14 is fixedly connected to the extension ring 12. An operating arc strip 15 is slidably connected to the outer surface of the semi-ring 9. Multiple rotating grooves 19 are formed on both sides of the outer surface of the operating arc strip 15. A locking piece 20 is rotatably connected inside the rotating groove 19. A connecting rod 21 is rotatably connected inside the locking piece 20. A lifting seat 22 is rotatably connected to the opposite ends of two adjacent connecting rods 21. A spring 23 is fixed to the bottom of the lifting seat 22 and inside the semi-ring 9. A push-pull rod 24 is rotatably connected to the inner side of the lifting seat 22 and inside the operating arc strip 15. A gear 25 is rotatably connected inside the semi-ring 9 between the operating arc strip 15 and the extension ring 12.

[0026] Slide the arc bar 15 → push and pull rod 24 drives the lifting seat 22 to press down → link 21 drives the locking piece 20 to rotate. The inner side of the locking piece 20 is provided with a protrusion that matches the slot 6. The protrusion is embedded in the slot 6, and the protruding surface of the locking piece 20 is in close contact with the inner wall of the slot 6 to achieve initial locking and positioning. After the operating arc bar 15 is released, the spring 23 automatically resets, and the lifting seat 22 is pushed up. The connecting rod 21 further locks the locking piece 20, so that the protruding surface of the locking piece 20 is always tightly fitted with the inner wall of the slot 6, forming a stable self-locking fixation to ensure that the locking does not loosen.

[0027] Preferably, the outer surface of the extension ring 12 and the inner side of the operating arc strip 15 are provided with a number of toothed grooves. The extension ring 12 and the operating arc strip 15 are connected to the gear 25 through the toothed grooves. This allows the extension ring 12 to extend and retract along the slide groove 11 synchronously through the gear 25 when the operating arc strip 15 slides, thereby realizing the opening and closing adjustment of the ring structure.

[0028] Preferably, a connector 16 is fixed on the outer surface of the semi-ring 9 outside the operating arc 15, and a hanger 17 is rotatably connected inside the connector 16. A mounting base 18 is rotatably connected to the top of the hanger 17. This facilitates the hoisting and fixing of the support mechanism 7 through the hanger 17 and the mounting base 18, adapting to the support and installation needs of different laying scenarios such as horizontal and vertical.

[0029] Preferably, the first clip 20 is located inside the slot 6, and the support mechanism 7 is engaged with the fixing ring 5 through the first clip 20, the slot 6, and the fixing ring 5, so that the support mechanism 7 and the fixing ring 5 can be quickly engaged and fixed without additional tools, thus improving the efficiency of installation and maintenance.

[0030] Preferably, the pipe connection mechanism 8 includes a sealing ring 26, which is located on the outer surface of the bend 1 and the straight pipe 2, and between two adjacent flanges 3. A collar 27 is fixed on the outer surface of the sealing ring 26, and the collar 27 is located on the outer surface of the two flanges 3. A rotating groove 28 is provided on both the left and right sides of the collar 27. A retaining member 29 is slidably connected inside the rotating groove 28. A movable groove 30 is provided at both the front and rear sides inside the retaining member 29. A movable rod 31 is movably connected inside the two movable grooves 30. A telescopic strip 32 is fixed inside the clip 29 on the surface. The two adjacent telescopic strips 32 are connected by a common threaded screw 33. A transmission wheel 34 is fixed in the middle of the outer surface of the screw 33. The screw 33 is rotatably connected to the inside of the collar 27. An operating ring 35 is rotatably connected to the outer surface of the collar 27. The operating ring 35 is located outside the transmission wheel 34. This forms a complete flange quick-clamp sealing structure. The screw drive drives the clip 29 to clamp the flange, and the sealing ring ensures the sealing effect of the hydrogen pipeline. The lead screw 33 adopts a trapezoidal thread. The thread helix angle of this thread structure is smaller than the equivalent friction angle of the thread pair. When the threads are engaged, a large static friction force is generated, forming a reliable mechanical self-locking resistance. This resistance can effectively counteract the loosening tendency of the clamp 29 caused by pipeline vibration and medium pressure. At the same time, the transmission direction of the lead screw 33 is perpendicular to the clamping direction of the clamp 29. When the operating ring 35 is rotated to drive the transmission wheel 34 and the lead screw 33 to rotate clockwise, the telescopic bars 32 on the left and right sides will move towards each other along the axial direction of the lead screw 33, thereby driving the clamp 29 to tighten towards the flange 3. After the external force is removed, the self-locking resistance of the thread pair will firmly lock the position of the telescopic bars 32. Without continuous external force driving, the clamp 29 can be permanently maintained in a clamping state.

[0031] Preferably, the outer surface of the transmission wheel 34 is in contact with the inner surface of the operating ring 35, so that when the operating ring 35 rotates, it drives the transmission wheel 34 to rotate, thereby driving the lead screw 33 to rotate synchronously.

[0032] Preferably, the two clamps 29 on the left and right sides are respectively attached to the opposite sides of the two flanges 3. The pipe connection mechanism 8 realizes the disassembly and connection of the bend 1 and the straight pipe 2 through the clamping of the clamps 29 and the flanges 3. By clamping the flanges 3 with the clamps 29, the connection and fixation of the bend 1 and the straight pipe 2 can be completed quickly, with reliable sealing and convenient disassembly and assembly.

[0033] Preferably, both the semi-ring 9 and the extension ring 12 are attached to the outer surface of the fixed ring 5. The semi-ring 9 and the extension ring 12 together form a semi-circular ring with a degree greater than 180 degrees, forming a ring-shaped support structure that firmly holds the fixed ring 5, preventing the support mechanism 7 from falling off, and providing uniform and stable external support for the bend 1.

[0034] Preferably, the two semi-tube sleeves 4 are arc-shaped shells adapted to the outer surface of the bend 1. After being joined, they fit together with the full arc surface of the outer surface of the bend 1. The mating edges of the two semi-tube sleeves 4 are provided with sealing and fitting surfaces. The two semi-tube sleeves 4 form a rigid constraint through the fixing ring 5. With the arc structure of the semi-tube sleeves 4 themselves, the bend 1 can be fully wrapped and sealed. The semi-tube sleeves 4 are made of a rigid, deformation-resistant, heat-insulating and protective integrated material, achieving the dual effects of heat preservation and impact prevention. Example

[0035] Reference Figure 11 In this embodiment, the bent pipe is installed horizontally with both ends of the bent pipe at the same horizontal height, and the whole pipe is laid horizontally. Example

[0036] Reference Figure 12 In this embodiment, the bend 1 is installed vertically, with its two ends arranged at different heights, resulting in an overall vertical installation. The concave side of the bend 1 faces downwards, and the support mechanism 7 is located on the convex side of the bend 1 (with the attached...). Figure 1 Conversely, it is suitable for hydrogen pipeline installation scenarios with significant elevation differences.

[0037] Workflow: 1. Protection and hoisting of bend 1: Two half-pipe sleeves 4 are fitted together and placed on the outer surface of the bend 1 to wrap the outside of the bend 1, which provides protection and insulation (to prevent low-temperature deceleration during hydrogen transportation). The fixing rings 5 ​​on the half-pipe sleeves 4 are aligned to form a complete ring structure. The sliding operation arc bar 15, through the meshing of gear 25, drives the extension ring 12 to retract inward along the slide groove 11. At this time, the semi-circular ring 9 of the individual half-ring part is ≤180 degrees, which can fasten the semi-ring part 9 to the outside of the fixed ring 5. At the same time, the operation arc bar 15 slides (the operation arc bar 15 uses the outer arc surface of the semi-ring part 9 as the circumferential sliding track) and pushes the push-pull rod 24 to push the lifting seat 22 down, thereby causing the connecting rod 21 to rotate and push the locking piece 20 to rotate. When the semi-ring part 9 is in contact with the fixed ring 5, the operation arc bar 15 is released and reset under the action of spring 23, thereby causing the locking piece 20 to enter the slot 6. At the same time, the extension ring 12 extends out and together with the semi-ring part 9 to form a semi-ring structure >180 degrees, which hugs the fixed ring 5, so that the support mechanism 7 is connected to the two half-tube sleeves 4. Then, according to different usage needs, the position can be adjusted by sliding along the fixed ring 5 (e.g. Figure 1 , Figure 11 , Figure 12 (As shown) Use; Finally, the support mechanism is hoisted and fixed by the hanger 17 and the mounting base 18 to provide external support and protection for the bend 1 and to distribute the stress on the pipe.

[0038] II. Connection between bend 1 and straight pipe 2 Rotating the operating ring 35 drives the lead screw 33 to rotate via the transmission wheel 34, which in turn drives the telescopic bars 32 on both sides to move towards each other. The movable rod 31 slides inside the inclined movable groove 30 and abuts against the inner wall of the movable groove 30. By squeezing, the second clamp 29 slides and retracts inside the rotating groove 28, placing the pipe connection mechanism 26 between the two flanges 3 that connect the bend 1 and the straight pipe 2. Reversing the operation resets the second clamp 29, and the left and right clamps 29 clamp and hold the two flanges 3 tightly, pressing the sealing ring 26 to achieve a quick-release sealing connection between the bend and the straight pipe, ensuring that hydrogen is not leaking.

[0039] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A seamless elbow for hydrogen pipeline comprising an elbow (1), a pipe joint mechanism (8), characterized in that: The right end of the bend (1) is detachably connected to a straight pipe (2) via a pipe connection mechanism (8). Flanges (3) are fixed to the edges of both the bend (1) and the straight pipe (2). Two half-pipe sleeves (4) are fitted on the outer surface of the bend (1). A fixing ring (5) is fixed in the middle of the outer surface of the half-pipe sleeve (4). Slots (6) are opened on both sides of the outer surface of the two fixing rings (5). A support mechanism (7) is detachably connected to the outer surface of the two fixing rings (5). The support mechanism (7) includes a semi-ring (9), with an inner groove (10) on the inner side of the semi-ring (9). A sliding groove (11) is provided behind the inner groove (10). An extension ring (12) is slidably connected inside the sliding groove (11). Arc-shaped through grooves (13) are provided on both the upper and lower surfaces of the sliding groove (11). A slider (14) is slidably connected inside the through groove (13). The slider (14) is fixedly connected to the extension ring (12). An operating arc strip (15) is slidably connected to the outer surface of the semi-ring (9). Multiple rotating parts are provided on both sides of the outer surface of the operating arc strip (15). The first groove (19) is rotatably connected to the first clamp (20), and the first clamp (20) is rotatably connected to the first rod (21). The two adjacent connecting rods (21) are rotatably connected to the lifting seat (22) at their opposite ends. The bottom of the lifting seat (22) and the inside of the semi-ring (9) are fixed with a spring (23). The inside of the lifting seat (22) and the inside of the operating arc (15) are rotatably connected to a push-pull rod (24). The inside of the semi-ring (9) is rotatably connected to a gear (25) between the operating arc (15) and the extension ring (12).

2. A seamless elbow for a hydrogen pipeline according to claim 1, characterized in that: The outer surface of the extension ring (12) and the inner side of the operating arc strip (15) are provided with a number of tooth grooves. The extension ring (12) and the operating arc strip (15) are connected to the gear (25) through the tooth grooves.

3. The seamless elbow for hydrogen pipeline according to claim 1, characterized in that: The outer surface of the semi-ring (9) is fixed with a connector (16) located outside the operating arc (15). A rod (17) is rotatably connected inside the connector (16), and a mounting base (18) is rotatably connected to the top of the rod (17).

4. The seamless elbow for hydrogen pipeline according to claim 1, characterized in that: The first card (20) is located inside the card slot (6), and the support mechanism (7) is engaged with the fixing ring (5) through the first card (20) and the card slot (6).

5. The seamless elbow for hydrogen pipeline according to claim 1, characterized in that: The pipe connection mechanism (8) includes a sealing ring (26), which is located on the outer surface of the bend (1) and the straight pipe (2) and between two adjacent flanges (3). A collar (27) is fixed on the outer surface of the sealing ring (26), which is located on the outer surface of the two flanges (3). A rotating groove (28) is provided on both the left and right sides of the collar (27). A retaining piece (29) is slidably connected inside the rotating groove (28). A movable groove (30) is provided at both the front and rear sides of the retaining piece (29). The movable groove (30) is connected to a movable rod (31) inside. The outer surface of the movable rod (31) is fixed with a telescopic strip (32) inside the second clamp (29). The two adjacent telescopic strips (32) are connected to a common threaded screw (33). A transmission wheel (34) is fixed in the middle of the outer surface of the screw (33). The screw (33) is rotatably connected to the inside of the collar (27). An operating ring (35) is rotatably connected to the outer surface of the collar (27). The operating ring (35) is located outside the transmission wheel (34).

6. A seamless bend for a hydrogen transport pipeline according to claim 5, characterized in that: The outer surface of the transmission wheel (34) is in contact with the inner surface of the operating ring (35).

7. A seamless bend for a hydrogen transport pipeline according to claim 5, characterized in that: The two clamps (29) on the left and right sides respectively fit against the opposite sides of the two flanges (3). The pipe connection mechanism (8) realizes the disassembly and connection of the bend (1) and the straight pipe (2) through the clamps (29) and flanges (3).

8. A seamless bend for a hydrogen transport pipeline according to claim 1, characterized in that: Both the semi-ring (9) and the extension ring (12) are attached to the outer surface of the fixed ring (5), and the semi-ring (9) and the extension ring (12) together form a semi-circular ring with a degree greater than 180 degrees.

9. A seamless bend for a hydrogen transport pipeline according to claim 1, characterized in that: The two half-tube sleeves (4) are arc-shaped shells adapted to the outer surface of the bend (1). After they are joined, they fit together with the full arc surface of the outer surface of the bend (1). The mating edges of the two half-tube sleeves (4) are provided with sealing and fitting surfaces. The two half-tube sleeves (4) form a rigid constraint through the fixing ring (5) and, together with the arc structure of the half-tube sleeves (4) themselves, achieve full enclosure and sealing of the bend (1).

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