Seamless tee for hydrogen pipeline

Abstract

The application discloses a seamless tee joint for hydrogen conveying pipeline, which comprises a tee joint body, the tee joint body is provided with a main pipe section and a branch pipe section communicated with the main pipe section, and the two ends of the main pipe section and the end of the branch pipe section are respectively formed with connecting ends for connecting the hydrogen conveying pipeline. At least one connecting end is provided with a screw joint, a rotating trigger, an auxiliary clamping assembly and a leakage prompting assembly. The screw joint is used for screwing and pressing with the external hydrogen conveying pipeline, and the rotating trigger is driven to produce angular displacement when the screw joint is screwed. The rotating trigger drives the clamping piece to rotate from the avoiding position to the clamping position through the transmission piece, so that the clamping piece is matched with the clamping part on the external hydrogen conveying pipeline or the screw joint, and the external hydrogen conveying pipeline is limited to be loosened in the reverse direction. The leakage prompting assembly comprises a gas guide part communicated with the leakage detection area near the connecting end and a prompting part arranged in the gas guide part. When the leakage gas is generated at the connecting part, the leakage gas enters the gas guide part and makes the prompting part produce the visual state change. The application can simultaneously complete the pressing, locking and leakage prompting positioning during the pipeline screwing process, and improves the sealing reliability and the inspection convenience of the tee joint connecting part of the hydrogen conveying pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline transportation technology, specifically a seamless tee for hydrogen transportation pipelines. Background Technology

[0002] As hydrogen energy is increasingly used in storage, transportation, supply, and industrial fuel, hydrogen pipelines typically require tee structures to connect main pipes and branch pipes for branching, merging, or bypassing. Due to the small size and strong diffusion capacity of hydrogen molecules, hydrogen pipeline connections are more prone to minor leaks compared to ordinary gas pipelines, especially at the connection points between the tee body and external or branch pipes. If only ordinary threaded connections, flange tightening, or sealing ring compression are used, long-term exposure to pressure fluctuations, vibration, and temperature changes may lead to loosening, seal degradation, and potential leaks at the connection points.

[0003] In existing technologies, such as the invention patent with authorization announcement number CN114949579B and titled "Three-Way Valve" shown in the screenshot, the sealing fit between the valve body and the plug is mainly achieved through the three-way valve body, plug, and spring plate structure. The multi-stage stepped structure of the spring plate further improves the locking and sealing performance between the plug and the valve body. This solution is suitable for scenarios involving plug assembly and sealing enhancement within three-way valves, and can improve the sealing effect between the valve body and the plug. However, its core improvement focuses on the assembly cavity inside the plug valve, the fit between the plug and the spring plate, and does not address the circumferential anti-loosening, secondary locking, and leakage visualization issues between the seamless tee of the hydrogen pipeline and the external hydrogen pipeline.

[0004] For seamless tees used in hydrogen pipelines, the connection position not only needs to ensure the strength of the pipeline connection, but also needs to form an additional lock after the external pipeline is tightened to prevent the external pipeline from retracting due to vibration or pressure pulsation. At the same time, it is also necessary to facilitate the quick detection of the leak location by inspection personnel in the event of a small hydrogen leak at the connection. Existing seamless tees mostly rely on a single thread or welded connection, lacking a mechanical locking structure that can be triggered synchronously with the assembly of the external pipeline, and also lacking a leak indication structure linked to the locking action. This results in the need for point-by-point inspection with external detection equipment during later maintenance, which is inefficient.

[0005] Therefore, it is necessary to propose a seamless tee for hydrogen pipelines that is suitable for hydrogen pipeline scenarios, can automatically form an auxiliary locking mechanism during pipeline connection, and can provide visual alerts for leak areas. Summary of the Invention

[0006] The purpose of this invention is to provide a seamless tee for hydrogen transportation pipelines to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a seamless tee for hydrogen transportation pipelines, comprising a tee body, the tee body comprising a main pipe section extending along a first direction and a branch pipe section communicating with the main pipe section, the two ends of the main pipe section respectively forming a first connection end and a second connection end for connecting to an external hydrogen transportation pipeline, and the end of the branch pipe section forming a third connection end for connecting to a branch hydrogen transportation pipeline. An external locking assembly is provided at at least one of the first connection end and the second connection end. The external locking assembly includes a screw-fitting component for screwing into an external hydrogen pipeline and a rotation triggering component that is linked to the screw-fitting component. When the screw-fitting component is screwed tight relative to the tee body, it drives the rotation triggering component to generate angular displacement. An auxiliary locking assembly is provided on the outside of the tee body, which is linked to the rotation trigger. The auxiliary locking assembly includes a transmission component and a locking component. One end of the transmission component is connected to the rotation trigger, and the other end is connected to the locking component. The locking component can rotate from the clearance position to the locking position under the drive of the rotation trigger, and cooperate with the locking groove on the external hydrogen pipeline or the swivel connector in the locking position to prevent the external hydrogen pipeline from loosening in the opposite direction relative to the tee body. The outside of the three-way body is also provided with a leakage warning component. The leakage warning component includes an overflow port, a guide rod and a warning part. The overflow port is located near the connection end of the three-way body. The guide rod is connected to the overflow port. The warning part is located on the guide rod or in the guide path of the guide rod, and is used to generate a visual status change after the leaked gas enters the overflow port. The screw connector, rotation trigger, transmission component, locking component, and indicator are interconnected to ensure that the connection, tightening, auxiliary locking, and leakage indicator positioning are completed simultaneously during the tightening of the external hydrogen pipeline.

[0008] Furthermore, the screw connector is a tightening sleeve fitted on the outside of the main pipe section connection end. The inner wall of the screw connector is provided with an internal thread, and the outer wall of the main pipe section connection end is provided with a main pipe connection thread section that mates with the internal thread. When the screw connector is tightened, it provides axial compression to the end of the external hydrogen transmission pipeline.

[0009] Furthermore, the outer periphery of the screw connector is provided with a trigger protrusion, which is arranged along the circumferential direction of the screw connector. The rotation trigger is disposed on the movement path of the trigger protrusion. When the screw connector is screwed to a predetermined position, the trigger protrusion pushes the rotation trigger to rotate around the hinge axis.

[0010] Furthermore, the rotation trigger is mounted on the hinge seat via a hinge shaft. The hinge seat is disposed on the mounting base, which is fixed to the outer wall of the tee body or the outer periphery of the connecting end. One end of the rotation trigger is connected to the transmission component.

[0011] Furthermore, the latching member is a rotatable claw, the latching member has a hook-shaped end that can extend into the latching groove, and an elastic abutment is provided on the outer side of the latching member. The elastic abutment is used to apply a pre-tightening force to the inner wall of the latching groove after the latching member enters the latching groove.

[0012] Furthermore, the elastic clamping part is made of hydrogen-resistant rubber, fluororubber, polytetrafluoroethylene composite elastic material or hydrogen-resistant sealing elastic material. The elastic clamping part has a beak-shaped, wedge-shaped or arc-shaped protrusion structure to form radial and circumferential composite limiting after the snap-fit ​​part is snapped into the snap-fit ​​groove.

[0013] Furthermore, the auxiliary locking assembly also includes a secondary locking component, which is linked with the transmission component or the locking component. When the locking component rotates to the locking position, the secondary locking component abuts against the limiting position of the locking component, the transmission component, or the mounting base to prevent the locking component from resetting in the reverse direction.

[0014] Furthermore, the secondary locking component includes an L-shaped pressure arm, the end of which is provided with a limiting protrusion. The limiting protrusion abuts against the limiting surface on the locking component or the mounting base, so that the locking component remains in the locked position when the external hydrogen pipeline is subjected to vibration.

[0015] Furthermore, the leakage indication component also includes a detection rod and a linkage shaft. The detection rod is connected to the air guide rod, and the linkage shaft is linked to the transmission component or the locking component. When the locking component enters the locking position, the linkage shaft drives the detection rod or the air guide rod to move to the detection position corresponding to the overflow port.

[0016] Furthermore, the indicator is a hydrogen-sensitive color-changing layer, a hydrogen-sensitive color-developing film, a hydrogen-sensitive material coating, or an adsorption color-developing element. The indicator is disposed at the end of the detection rod or on the outer surface of the gas guide rod and exposed in the observation area outside the three-way body. When leaked gas appears near the connection end and enters the gas guide path through the overflow port, the indicator changes color to indicate the location of the leak.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention incorporates a screw-in connector, a rotation trigger, and an auxiliary locking assembly at the connection end of the tee body. This allows the external hydrogen pipeline to not only achieve thread tightening during the tightening process but also simultaneously drive the locking component into the locking groove to form a mechanical stop. Compared to relying solely on threaded or sealing ring tightening, this structure prevents the hydrogen pipeline from loosening due to pressure pulsations, equipment vibration, or thermal expansion and contraction, thereby improving the long-term sealing reliability of the connection.

[0018] 2. This invention utilizes the circumferential motion generated when the screw-on connector is tightened as the triggering force. By rotating the trigger and transmission components, the locking component is driven to rotate to the locking position. This eliminates the need for additional complex external locking tools and a secondary manual locking operation after installation. Assembly personnel only need to tighten the external hydrogen pipeline in a conventional manner to simultaneously complete the auxiliary locking, reducing installation difficulty and improving on-site construction efficiency.

[0019] 3. This invention includes a gas guide and an indicator near the connection point. When a minor leak occurs at the connection, the leaking gas can enter the gas guide channel through the overflow port and come into contact with the indicator, causing a color or state change. Inspection personnel can directly determine whether a leak exists and its location by observing the indicator, eliminating the need to rely entirely on external detectors for point-by-point checks, thus improving the convenience of daily maintenance and safety inspections of hydrogen pipelines. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a seamless tee for hydrogen transportation pipelines according to the present invention; Figure 2 for Figure 1 A partially enlarged schematic diagram of the auxiliary locking component at point A; Figure 3 This is a schematic diagram of the structure of a seamless tee for hydrogen transportation pipelines according to the present invention from another perspective; Figure 4 This is a schematic diagram of the structure of the tee body, the main pipe section connection end, and the branch pipe section connection end in this invention; Figure 5 This is a schematic diagram of the structure of the auxiliary locking component and the leakage indication component after assembly in this invention; Figure 6 for Figure 5 A partially enlarged structural diagram of the secondary locking component, locking component, and elastic clamping part at point B; Figure 7 This is a schematic diagram of the linkage state between the rotary connector and the rotation trigger in this invention; Figure 8 This is a schematic diagram of the arrangement of the leakage warning component and the air guide in this invention.

[0021] Explanation of reference numerals in the attached figures: 1. Mounting base; 2. Screw connector; 3. Branch pipe section; 4. Internal thread; 5. Third connection end; 6. Connecting clamping sleeve; 7. T-shaped body; 8. Hinge seat; 9. Secondary locking component; 10. Linkage pressure arm; 11. Guide groove; 12. Locking component; 13. Detection rod; 14. Linkage shaft; 15. Locking groove; 16. Limiting protrusion; 17. Transmission component; 18. Hinge shaft; 19. Rotation trigger component; 20. Sliding groove; 21. Air guide rod; 22. Branch linkage component; 23. Main pipe connection threaded section; 24. Overflow port; 25. Elastic clamping part; 26. Rotating shaft; 27. Indicator part. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example: like Figures 1 to 8 As shown, this embodiment provides a seamless tee for hydrogen transportation pipelines, including a tee body 7. The tee body 7 preferably adopts a seamless pipe fitting integral molding structure or a seamless pipe section hot extrusion molding structure, forming a continuous gas flow channel inside to reduce the impact of welds and splices on hydrogen transportation safety. The tee body 7 includes a main pipe section extending horizontally and a branch pipe section 3 extending upward from the middle of the main pipe section. The two ends of the main pipe section serve as a first connection end and a second connection end, respectively, for connecting to external hydrogen transportation pipelines on both sides; the upper end of the branch pipe section 3 serves as a third connection end 5, for connecting to a branch hydrogen transportation pipeline or a detection branch.

[0024] Both ends of the main pipe section are respectively provided with main pipe connection threaded sections 23, which are used to mate with the internal threads 4 of the screw connector 2. The screw connector 2 can be a tightening sleeve, a compression sleeve, or an external pipe connection sleeve, and its inner wall is machined with internal threads 4. After the external hydrogen transmission pipe is inserted into the connection end of the main pipe section, the screw connector 2 is tightened along the main pipe connection threaded section 23, so that the seal at the connection end of the external hydrogen transmission pipe and the connection end of the tee body 7 is axially compressed. The seal can be a fluororubber sealing ring, a polytetrafluoroethylene sealing gasket, a metal spiral wound gasket, or a composite sealing ring suitable for hydrogen medium. Through the above structure, the screw connector 2 undertakes the axial compression function in conventional pipe connections.

[0025] To prevent the swivel joint 2 from loosening in the reverse direction due to vibration, pressure fluctuations, or external pulling during long-term operation of the hydrogen pipeline, this embodiment provides an auxiliary locking assembly between the swivel joint 2 and the tee body 7. The auxiliary locking assembly includes a rotation trigger 19, a transmission component 17, a locking component 12, and a locking groove 15. The locking groove 15 is located on the outer periphery of the swivel joint 2 or the outer periphery of the connecting sleeve of the external hydrogen pipeline. The locking groove 15 can be a groove, notch, tooth, or limiting hole arranged circumferentially. The rotation trigger 19 is mounted on the mounting base 1 or hinge base 8 via a hinge shaft 18. The mounting base 1 is fixed to the outer wall of the tee body 7 near the main pipe section connection end. One end of the transmission component 17 is connected to the rotation trigger 19, and the other end is connected to the locking component 12, so that the rotation trigger 19 can drive the locking component 12 to rotate synchronously when it rotates.

[0026] The outer periphery of the screw connector 2 is provided with a trigger protrusion, which can be a semi-cylindrical protrusion, a rib, a lever, or a stepped surface. When the screw connector 2 is tightened along the threaded section 23 of the main pipe connection, the trigger protrusion moves synchronously circumferentially with the screw connector 2. When the screw connector 2 is tightened to a predetermined angle, the trigger protrusion contacts the rotating trigger 19 and pushes the rotating trigger 19 to swing outward or inward around the hinge shaft 18. The angular displacement of the rotating trigger 19 is transmitted to the locking member 12 via the transmission member 17, causing the locking member 12 to rotate from the clearance position to the locking position. The clearance position refers to the position where the locking member 12 does not extend into the locking groove 15 and does not affect the rotational assembly of the screw connector 2; the locking position refers to the position where the end of the locking member 12 extends into the locking groove 15, thereby restricting the reverse rotation of the screw connector 2.

[0027] The locking member 12 is preferably a claw structure, with its end configured as a hook, wedge, or arc-shaped clamping shape. An elastic abutment 25 is provided on the outer side of the locking member 12, preferably made of hydrogen-resistant rubber, fluororubber, or polytetrafluoroethylene composite elastic material. The elastic abutment 25 can be beak-shaped, arc-shaped, or wedge-shaped. When the locking member 12 enters the locking groove 15, the elastic abutment 25 elastically abuts against the inner wall of the locking groove 15, filling the gap between the locking member 12 and the locking groove 15 to reduce vibration-induced shaking; and increasing the resistance required for the locking member 12 to disengage from the locking groove 15 through elastic pre-tightening force, thereby improving the mechanical locking stability.

[0028] Furthermore, such as Figure 5 and Figure 6As shown, this embodiment also includes a secondary locking component 9. The secondary locking component 9 can be an L-shaped pressure arm with a limiting protrusion 16 at its bottom or end. When the locking component 12 rotates to the locking position, the secondary locking component 9 undergoes angular displacement with the transmission component 17 or the linkage pressure arm 10, causing the limiting protrusion 16 to abut against the limiting surface on the locking component 12, the transmission component 17, or the mounting base 1. After the limiting protrusion 16 abuts against the adjacent limiting surface, it can prevent the locking component 12 from resetting due to vibration. The purpose of the design of this secondary locking component 9 is to form a mechanical anti-retraction structure after the screw-on component 2 has been tightened and the locking component 12 has entered the locking groove 15, making it difficult for the locking component 12 to come out of the locking groove 15, thereby improving the vibration resistance and anti-loosening capability of the hydrogen pipeline connection.

[0029] Branch pipe section 3 can also be equipped with the same or similar screw connector 2, rotation trigger 19, and auxiliary locking assembly as the connection end of the main pipe section. When the third connection end 5 connects to the branch hydrogen pipeline, the screw connector 2 on the outside of the third connection end 5 also drives the corresponding rotation trigger 19 to rotate through the tightening action, and drives the corresponding locking component 12 into the locking groove 15 on the branch pipeline connector through the branch linkage component 22, linkage pressure arm 10, or transmission component 17. In this way, both ends of the main pipe section and branch pipe section 3 can form a connection structure of screw tightening and pressure connection with auxiliary locking + secondary locking, which is suitable for multi-directional connection scenarios of hydrogen transportation tees.

[0030] like Figure 8 As shown, this embodiment also includes a leakage warning component. The leakage warning component includes an overflow port 24, a guide rod 21, a detection rod 13, and a warning part 27. The overflow port 24 is located near the sealing area of ​​the connection end of the tee body 7, specifically on the outer side of the connection between the screw connector 2 and the tee body 7, at the annular detection cavity of the main pipe section connection end, or on the outer periphery of the branch pipe section 3 connection end. The overflow port 24 communicates with the gas guiding channel. When a small amount of hydrogen leaks from the outside of the seal, the leaking gas preferentially enters the overflow port 24 and flows along the gas guiding channel. The guide rod 21 and the detection rod 13 are used to guide the leaking gas to a position that is easy to observe. The warning part 27 is located at the end of the detection rod 13, on the outer surface of the guide rod 21, or inside the observation window.

[0031] The indicator section 27 can employ a hydrogen-sensitive color-changing layer, a hydrogen-sensitive color-developing film, a palladium-based hydrogen-sensitive coating, a hydrogen-sensitive color-changing ink layer, or a composite indicator sheet that changes color under the influence of hydrogen. The indicator section 27 is exposed on the outside of the tee body 7 or housed within a transparent observation window. When there is no leakage at the connection point, the indicator section 27 retains its initial color; when a leak occurs at the connection point, the leaking gas enters the gas guide channel through the vent 24 and comes into contact with the indicator section 27, causing it to change color. Inspection personnel can determine whether there is a leak at the corresponding connection point based on the color change of the indicator section 27, thereby quickly locating the leak area.

[0032] To ensure the leak detection component and the auxiliary locking component are linked, in this embodiment, the detection rod 13 is connected to the linkage shaft 14, which in turn is connected to the transmission component 17 or the locking component 12. When the rotating trigger 19 drives the locking component 12 into the locking position, the linkage shaft 14 simultaneously drives the detection rod 13 to rotate or move, causing the indicator part 27 to enter the gas guide detection position corresponding to the overflow port 24. In other words, when the external hydrogen pipeline is not yet tightened, the indicator part 27 can be in a clearance position to avoid damage during assembly; when the screw connector 2 is tightened and locked, the indicator part 27 simultaneously enters the detection position, ensuring that the leak detection state is consistent with the pipeline connection completion state. This linkage prevents installers from forgetting to place the leak detection component and also prevents the leak detection from failing due to the indicator part not being in place.

[0033] When installing the external hydrogen pipeline, first insert the end of the external hydrogen pipeline into the main pipe connection end of the tee body 7, aligning the end face of the external hydrogen pipeline with the sealing element. Then rotate the screw connector 2, gradually tightening it along the threaded section 23 of the main pipe connection. During the tightening process, the inner end face of the screw connector 2 applies axial pressure to the sealing element, forming the first seal between the external hydrogen pipeline and the tee body 7. As the screw connector 2 is tightened to the predetermined position, the trigger protrusion on the outer periphery of the screw connector 2 pushes the rotating trigger 19 to rotate. The rotating trigger 19 drives the locking element 12 to rotate through the transmission element 17, causing the hook-shaped end of the locking element 12 to enter the locking groove 15. At this time, even if the screw connector 2 is subjected to reverse vibration force, it will be blocked by the locking element 12 and difficult to loosen.

[0034] When the snap-fit ​​component 12 enters the snap-fit ​​groove 15, the elastic abutment part 25 elastically presses against the inner wall of the snap-fit ​​groove 15, forming a flexible pre-tightening. At the same time, the secondary locking component 9 rotates under the drive of the linkage pressure arm 10 or the transmission component 17, causing the limiting protrusion 16 to abut against the limiting surface of the snap-fit ​​component 12 or the transmission component 17, thereby preventing the snap-fit ​​component 12 from reversing and exiting the snap-fit ​​groove 15. Thus, the connection end forms a triple anti-loosening structure of threaded clamping, snap-fit ​​limiting, and secondary anti-retraction.

[0035] Upon locking, the linkage shaft 14 moves the detection rod 13 or the gas guide rod 21 to the detection position, aligning the indicator 27 with the overflow port 24. When the hydrogen pipeline is operating normally and the connection is well-sealed, the indicator 27 shows no significant change. However, when the seal ages, the screw connector 2 is not fully tightened, or a small leak occurs due to external force at the connection, the leaking gas enters the overflow port 24 and contacts the indicator 27 along the gas guide channel, causing a color or status change in the indicator 27. During maintenance, personnel only need to observe the indicator 27 on the outside of the corresponding connection end to determine if there is a risk of leakage.

[0036] Therefore, this invention does not simply add a regular locking buckle to the outside of a seamless tee. Instead, it utilizes the tightening action of the screw connector 2 as a trigger source to create a continuous linkage between pipe assembly, auxiliary locking, secondary stabilization, and the placement of the leak indicator. This structure reduces the operational complexity for installers while improving the reliability of anti-loosening measures and the efficiency of leak inspection at the hydrogen pipeline connection. It is particularly suitable for hydrogen transmission pipelines, hydrogen energy storage and transportation networks, hydrogen refueling systems, and industrial hydrogen supply branch connection scenarios.

[0037] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A seamless tee for hydrogen transport pipelines, comprising a tee body (7), characterized in that: The three-way body (7) includes a main pipe section extending along a first direction and a branch pipe section (3) communicating with the main pipe section. The two ends of the main pipe section respectively form a first connection end and a second connection end for connecting to an external hydrogen transmission pipeline, and the end of the branch pipe section (3) forms a third connection end (5) for connecting to a branch hydrogen transmission pipeline. An external locking assembly is provided at at least one of the first connection end and the second connection end. The external locking assembly includes a screw connector (2) for screwing into an external hydrogen pipeline and a rotation trigger (19) linked to the screw connector (2). When the screw connector (2) is screwed into the tee body (7), it drives the rotation trigger (19) to generate angular displacement. An auxiliary locking assembly is provided on the outside of the three-way body (7) and is linked to the rotation trigger (19). The auxiliary locking assembly includes a transmission component (17) and a locking component (12). One end of the transmission component (17) is connected to the rotation trigger (19), and the other end is connected to the locking component (12). The locking component (12) can rotate from the avoidance position to the locking position under the drive of the rotation trigger (19), and cooperate with the locking groove (15) on the external hydrogen pipeline or the screw connector (2) in the locking position to restrict the external hydrogen pipeline from loosening in the opposite direction relative to the three-way body (7). A leakage warning component is also provided on the outside of the three-way body (7). The leakage warning component includes an overflow port (24), a guide rod (21), and a warning part (27). The overflow port (24) is located near the connection end of the three-way body (7). The guide rod (21) is connected to the overflow port (24). The warning part (27) is located on the guide rod (21) or in the guide path of the guide rod (21) and is used to generate a visual state change after the leaked gas enters the overflow port (24). Among them, the screw connector (2), the rotation trigger (19), the transmission component (17), the snap connector (12) and the prompting part (27) form an assembly linkage relationship, so that the connection and tightening, auxiliary locking and leakage prompting part positioning are completed simultaneously during the tightening process of the external hydrogen pipeline.

2. A seamless tee for hydrogen transportation pipelines according to claim 1, characterized in that: The screw connector (2) is a screw-tightening sleeve fitted on the outside of the main pipe section connection end. The inner wall of the screw connector (2) is provided with an internal thread (4). The outer wall of the main pipe section connection end is provided with a main pipe connection thread section (23) that mates with the internal thread (4). When the screw connector (2) is tightened, it is axially pressed at the end of the external hydrogen transmission pipeline.

3. A seamless tee for hydrogen transportation pipelines according to claim 2, characterized in that: The outer periphery of the swivel joint (2) is provided with a trigger protrusion. The trigger protrusion is arranged along the circumferential direction of the swivel joint (2). The rotating trigger (19) is arranged on the movement path of the trigger protrusion. When the swivel joint (2) is tightened to a predetermined position, the trigger protrusion pushes the rotating trigger (19) to rotate around the hinge axis (18).

4. A seamless tee for hydrogen transportation pipelines according to claim 3, characterized in that: The rotation trigger (19) is mounted on the hinge seat (8) via the hinge shaft (18). The hinge seat (8) is set on the mounting seat (1). The mounting seat (1) is fixed to the outer wall of the three-way body (7) or the outer periphery of the connecting end. One end of the rotation trigger (19) is connected to the transmission component (17).

5. A seamless tee for hydrogen transportation pipelines according to claim 1, characterized in that: The snap-fit ​​component (12) is a rotatable snap-fit ​​claw. The snap-fit ​​component (12) has a hook-shaped end that can extend into the snap-fit ​​groove (15). An elastic abutment (25) is provided on the outside of the snap-fit ​​component (12). The elastic abutment (25) is used to apply a pre-tightening force to the inner wall of the snap-fit ​​groove (15) after the snap-fit ​​component (12) enters the snap-fit ​​groove (15).

6. A seamless tee for hydrogen transportation pipelines according to claim 5, characterized in that: The elastic clamping part (25) is made of hydrogen-resistant rubber, fluororubber, polytetrafluoroethylene composite elastic material or hydrogen-resistant sealing elastic material. The elastic clamping part (25) has a beak-shaped, wedge-shaped or arc-shaped protrusion structure to form a radial and circumferential composite limit after the snap-fit ​​part (12) is snapped into the snap-fit ​​groove (15).

7. A seamless tee for hydrogen transportation pipelines according to claim 1, characterized in that: The auxiliary locking assembly also includes a secondary locking component (9). The secondary locking component (9) is linked with the transmission component (17) or the locking component (12). When the locking component (12) rotates to the locking position, the secondary locking component (9) abuts against the limiting position of the locking component (12), the transmission component (17) or the mounting base (1) to restrict the locking component (12) from reversing.

8. A seamless tee for hydrogen transportation pipelines according to claim 7, characterized in that: The secondary locking component (9) includes an L-shaped pressure arm, and the end of the L-shaped pressure arm is provided with a limiting protrusion (16). The limiting protrusion (16) abuts against the limiting surface on the locking component (12) or the mounting base (1), so that the locking component (12) remains in the locking position when the external hydrogen pipeline is vibrated.

9. A seamless tee for hydrogen transportation pipelines according to claim 1, characterized in that: The leakage warning component also includes a detection rod (13) and a linkage shaft (14). The detection rod (13) is connected to the air guide rod (21), and the linkage shaft (14) is linked to the transmission component (17) or the snap-fit ​​component (12). When the snap-fit ​​component (12) enters the snap-fit ​​position, the linkage shaft (14) drives the detection rod (13) or the air guide rod (21) to move to the detection position corresponding to the overflow port (24).

10. A seamless tee for hydrogen transportation pipelines according to claim 9, characterized in that: The indicator part (27) is a hydrogen-sensitive color-changing layer, a hydrogen-sensitive color-developing film, a hydrogen-sensitive material coating, or an adsorption color-developing element. The indicator part (27) is disposed at the end of the detection rod (13) or on the outer surface of the gas guide rod (21), and is exposed in the observation area outside the three-way body (7). When leaked gas appears near the connection end and enters the gas guide path through the overflow port (24), the indicator part (27) changes color to indicate the location of the leak.

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