Hydrogen pipeline connecting device

Abstract

The invention relates to the technical field of pipeline connection, in particular to a hydrogen pipeline connecting device which comprises a connecting box. The fixing assembly comprises placing openings formed in the two sides of the connecting box; the connecting assembly comprises a large-pipe-diameter pipeline and a small-pipe-diameter pipeline which are fixedly installed in the containing opening, the connecting assembly further comprises two expansion pipes arranged on the inner wall of the large-pipe-diameter pipeline and the inner wall of the small-pipe-diameter pipeline, and a plurality of notches are formed in the outer walls of the expansion pipes in a circumferential array mode; the expansion pipe is driven to be attached to the inner wall of the large-diameter pipeline and the inner wall of the small-diameter pipeline. According to the invention, the expansion tube and the elastic telescopic sheet form a tapered-gradually-expanded biconical flow cavity, so that the change of the sectional area of hydrogen from a large tube diameter to a small tube diameter is in smooth transition, and the flow deflectors further guide airflow to be uniformly distributed, so that the impact force of sudden flow velocity change on the tube wall is remarkably reduced, and the generation of turbulent flow is inhibited; therefore, displacement and connection looseness of the small-pipe-diameter end face caused by dynamic impact are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connection, and particularly relates to a hydrogen pipeline connection device. Background Art

[0002] Hydrogen is a colorless, odorless, and non-toxic gas. It is one of the lightest and simplest molecules in the universe, consisting of two hydrogen atoms and usually existing in the form of a gas. Hydrogen is a very active gas under normal temperature and pressure and easily reacts with other substances, especially with oxygen to form water. Therefore, it is also considered a potential clean energy carrier.

[0003] Hydrogen is widely used in industrial and energy applications. For example, in processes such as hydrogen fuel cells, petroleum refining, and chemical synthesis, hydrogen often needs to be transported from the production site to the consumption site. Transporting hydrogen through pipelines can improve transportation efficiency and reduce hydrogen loss during transportation. Therefore, during the transportation of hydrogen, connecting pipelines are required for transportation. For example, a hydrogen pipeline connection device disclosed in the patent with publication number CN117905962B is used to connect pipelines during hydrogen transportation; When connecting pipelines with different diameters, existing devices usually use a reducing connector to connect pipelines with different diameters. However, after connecting different pipelines, hydrogen will impact the end face of the pipeline cross-section during circulation and generate turbulence, causing vibration at the pipeline connection. Over time, the hydrogen circulation will cause displacement between the end face of the pipeline and the reducing connector, resulting in the pipeline detaching from the reducing connector. The vibration generated by the turbulence will loosen the connection between the reducing connector and the pipeline, causing air leakage; Moreover, according to Bernoulli's principle, when hydrogen enters from a larger-diameter section into a smaller-diameter section, due to the reduction in the cross-sectional area of the small diameter, the air flow velocity will suddenly increase. Especially under turbulent flow or pulsating flow conditions, when hydrogen is discharged, the gas flow rate will be uncontrolled as the air flow velocity increases. For example, the hydrogen discharge amounts when the valve is opened at normal flow velocity for 5 minutes and at increased flow velocity for 5 minutes are completely different, resulting in hydrogen waste. Summary of the Invention

[0004] Aiming at the above-mentioned drawbacks of the prior art, the present invention provides a hydrogen pipeline connection device, which can effectively solve the problems in the prior art that hydrogen will impact the end face of the pipeline cross-section during circulation, generate turbulence, cause vibration at the pipeline connection, and result in hydrogen leakage.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: The present invention provides a hydrogen pipeline connection device, including: A connection box; A fixing component, the fixing component includes placement openings formed on both sides of the connection box; Connection component, the connection component includes a large-diameter pipe and a small-diameter pipe fixedly installed in the placement port. The connection component further includes two expansion pipes arranged on the inner walls of the large-diameter pipe and the small-diameter pipe. A plurality of notches are circumferentially arrayed on the outer wall of the expansion pipe, and the expansion pipe is driven to fit with the inner walls of the large-diameter pipe and the small-diameter pipe; Adjustment component, the adjustment component includes a fixed sleeve integrally formed between the two expansion pipes. An expansion airbag is arranged in the fixed sleeve, and a compression space is formed between the fixed sleeve and the expansion airbag; Wherein, after the expansion pipe fits with the inner wall of the large-diameter pipe, an expansion section is formed, and an expansion section is formed inside the expansion airbag. The expansion pipe fits with the inner wall of the small-diameter pipe to form a contraction section. A flow monitoring element is arranged in the expansion section, and the flow monitoring element is electrically connected to a controller. Taking the expansion section as the starting point and the contraction section as the ending point, and the length direction of the connection box as the a-line, hydrogen flows in the direction of the a-line.

[0006] Preferably, two chutes are symmetrically opened on the upper end face of the connection box. A partition is fixedly installed on the upper end face of the connection box and between the chutes. Self-centering chucks for fixing the large-diameter pipe and the small-diameter pipe are fixedly installed on both sides of the connection box and at positions corresponding to the placement ports.

[0007] Preferably, a fixing ring is fixedly installed on the inner wall of the expansion pipe near the expansion airbag. One end of the fixing ring away from the expansion airbag is fixedly installed with an elastic telescopic piece. An inflation ring is fixedly installed on the side of the elastic telescopic piece away from the expansion airbag. A plurality of expansion parts are integrally formed in the notches on the outer wall of the inflation ring. The outer wall of the expansion part is communicated with an air vent hose, and one end of the air vent hose away from the inflation ring is communicated with a hollow ring.

[0008] Preferably, brackets are symmetrically installed on the inner wall of the connection box. One end of the bracket is fixedly installed with an outer sleeve ring arranged on the outer wall of the expansion pipe, and an inner annular airbag is fixedly installed on the inner wall of the outer sleeve ring.

[0009] Preferably, a pumping device is fixedly installed at the inner bottom end of the connection box. The pumping device is electrically connected to the controller. The pumping device has two output ends. One of the output ends is fixedly installed with a gas supply pipeline, and the other output end is fixedly installed with a shunt. The shunt is respectively communicated with the hollow ring and the inner annular airbag.

[0010] Preferably, an external frame is fixedly installed on the outer wall of the hollow ring. The external frame passes through the sliding groove and extends upward. Two fixing plates are symmetrically installed on the upper end face of the connection box. On the opposite sides of the two fixing plates, a rotary driving member is fixedly connected. The output end of the rotary driving member passes through the fixing plate and is fixedly installed with a threaded rod. The threaded rod is rotatably connected to the fixing plate and the partition plate. A rotating collar is threadedly connected to the threaded rod. The rotating collar is rotatably connected to the external frame. The spiral directions of the threads on the two threaded rods are opposite.

[0011] Preferably, a fixed vertical plate is fixedly installed at the inner top end of the connection box. The fixed vertical plate is fixedly connected to the fixed sleeve. On the inner wall of the elastic telescopic sheet and at the position corresponding to the contraction section, a support collar is fixedly installed. A plurality of flow guiding sheets are fixedly installed in a circumferential array on the inner wall of the support collar. One end of the flow guiding sheet close to the axis of the support collar is commonly fixedly installed with a short shaft. Both ends of the expansion airbag are fixedly connected to the fixed ring.

[0012] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art: First, a gradually shrinking - gradually expanding double - conical flow cavity is formed by the expansion tube and the elastic telescopic sheet, so that the cross - sectional area change of hydrogen from a large pipe diameter to a small pipe diameter has a smooth transition. The flow guiding sheets further guide the airflow to be evenly distributed, significantly reducing the impact force of the flow velocity mutation on the pipe wall, suppressing the generation of turbulence, and thus avoiding the displacement and connection loosening of the small - diameter end face caused by dynamic impact.

[0013] Second, the expansion rate is dynamically adjusted by the air - pumping device. When the flow rate is large, the airbag expands, increasing the cross - sectional area of the transition section, buffering the high - speed impact of hydrogen and temporarily storing part of the gas; when the flow rate is small, the airbag contracts to maintain normal circulation. This design balances the pressure change caused by the Bernoulli effect by adaptively adjusting the cross - sectional area, ensuring the stable delivery of hydrogen at a controllable flow velocity and avoiding waste and leakage risks caused by continuous high - speed airflow in the small - diameter pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 is a three - dimensional structural schematic diagram of the present invention; Figure 2 is a sectional structural schematic diagram of the present invention; Figure 3 is an internal structural schematic diagram of the connection box of the present invention; Figure 4 Structural schematic diagram of the connection component of the present invention; Figure 5 Cross-sectional structural schematic diagram of the connection component of the present invention; Figure 6 Exploded structural schematic diagram of the inflatable ring of the present invention.

[0016] Reference numerals: 1, connection box; 2, fixing component; 201, self-centering chuck; 202, partition plate; 203, large-diameter pipeline; 204, small-diameter pipeline; 205, chute; 206, placement opening; 3, connection component; 301, expansion pipe; 302, elastic telescopic sheet; 303, fixing ring; 304, inflatable ring; 305, ventilation hose; 306, hollow ring; 307, external frame; 308, rotating collar; 309, threaded rod; 310, fixing plate; 311, rotation driving member; 312, air pumping device; 313, air supply pipeline; 314, shunt; 315, bracket; 316, outer sleeve ring; 317, inner annular airbag; 4, adjustment component; 401, fixed vertical plate; 402, fixed sleeve; 403, expansion airbag; 404, support collar; 405, guide vane. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Embodiment: Refer to Figures 1 to 6 , a hydrogen pipeline connection device, comprising: Connection box 1; Fixing component 2, the fixing component 2 includes placement openings 206 opened on both sides of the connection box 1; Connection component 3, the connection component 3 includes a large-diameter pipeline 203 and a small-diameter pipeline 204 fixedly installed in the placement opening 206. The connection component 3 further includes two expansion pipes 301 arranged on the inner walls of the large-diameter pipeline 203 and the small-diameter pipeline 204. A plurality of notches are circumferentially arrayed on the outer wall of the expansion pipe 301, and the expansion pipe 301 is driven to fit with the inner walls of the large-diameter pipeline 203 and the small-diameter pipeline 204; Adjusting assembly 4, the adjusting assembly 4 includes a fixed sleeve 402 integrally formed between two expansion tubes 301. An expansion airbag 403 is arranged inside the fixed sleeve 402, and a compression space is formed between the fixed sleeve 402 and the expansion airbag 403. The expansion airbag 403 can be made of existing composite materials: the inner layer is made of polyamide-imide film, the middle layer is a fluororubber bonding layer, and the outer layer is an aramid fiber reinforced layer. While ensuring flexibility, it realizes the core properties required for the hydrogen pipeline, such as ultra-low permeability, pressure resistance, and weather resistance, and adapts to the dynamic expansion requirements of the adjusting assembly 4; Among them, after the expansion tube 301 fits with the inner wall of the large-diameter pipeline 203, an expansion section is formed, and an expansion section is formed inside the expansion airbag 403. After the expansion tube 301 fits with the inner wall of the small-diameter pipeline 204, a contraction section is formed. A flow monitoring element is arranged in the expansion section. The flow monitoring element uses an existing electromagnetic flowmeter. The electromagnetic flowmeter works based on Faraday's law of electromagnetic induction. When a conductive liquid flows through the measuring pipeline of the electromagnetic flowmeter, the generated voltage is proportional to the flow velocity. The flow monitoring element is electrically connected to a controller. Taking the expansion section as the starting point and the contraction section as the end point, and the length direction of the connection box 1 as the a-line, hydrogen flows in the direction of the a-line.

[0020] Refer to Figures 1 to 2 , two chutes 205 are symmetrically opened on the upper end surface of the connection box 1. A partition 202 is fixedly installed on the upper end surface of the connection box 1 and between the chutes 205. Self-centering chucks 201 for fixing the large-diameter pipeline 203 and the small-diameter pipeline 204 are fixedly installed on both sides of the connection box 1 and at positions corresponding to the placement ports 206. The self-centering chuck 201 is an existing device, mainly used for clamping workpieces and ensuring that they can maintain stable positioning and central alignment during the processing. The self-centering chuck 201 has the ability to automatically adjust the position of the jaws to ensure that the workpiece is always in the center position in the chuck.

[0021] Refer to Figures 2 to 6, a fixing ring 303 is fixedly installed on the inner wall of the expansion tube 301 and near the position of the expansion airbag 403. One end of the fixing ring 303 away from the expansion airbag 403 is fixedly installed with an elastic telescopic piece 302. One side of the elastic telescopic piece 302 away from the expansion airbag 403 is fixedly installed with an inflation ring 304. A plurality of expansion parts are integrally formed on the outer wall of the inflation ring 304 and within the notch. The outer wall of the expansion part is communicated with an air vent hose 305. The air vent hose 305 is made of a polyurethane reinforced hose for use. This kind of hose has high wear resistance and flexibility. At the same time, the reinforced structure can prevent excessive shrinkage of the inner diameter after bending, ensuring ventilation. One end of the air vent hose 305 away from the inflation ring 304 is communicated with a hollow ring 306. The inner wall of the connection box 1 is symmetrically installed with brackets 315. One end of the bracket 315 is fixedly installed with an outer sleeve ring 316 arranged on the outer wall of the expansion tube 301. The inner wall of the outer sleeve ring 316 is fixedly installed with an inner annular airbag 317. The inner bottom end of the connection box 1 is fixedly installed with a pumping device 312. The pumping device 312 uses an existing two-way air pump for use. Two-way air pumps usually can switch the intake or exhaust according to needs through different valve or air flow channel designs. They generally have two independent air flow channels, allowing one of the output ends to be used for suction and the other for exhaust. The pumping device 312 is electrically connected to the controller. The pumping device 312 has two output ends. One of the output ends is fixedly installed with a gas supply pipeline 313, and the other output end is fixedly installed with a diverter 314. The diverter 314 is respectively communicated with the hollow ring 306 and the inner annular airbag 317. The outer wall of the hollow ring 306 is fixedly installed with an external bracket 307. The external bracket 307 penetrates through the sliding groove 205 and extends upward. Two fixing plates 310 are symmetrically installed on the upper end face of the connection box 1. On the relative sides of the two fixing plates 310, a rotary driving part 311 is fixedly connected. The rotary driving part 311 uses an existing motor for use. The output end of the rotary driving part 311 penetrates through the fixing plate 310 and is fixedly installed with a threaded rod 309. The threaded rod 309 is rotatably connected to the fixing plate 310 and the partition plate 202. A rotating collar 308 is threadedly connected to the threaded rod 309. The rotating collar 308 is rotatably connected to the external bracket 307. The spiral directions of the threads on the two threaded rods 309 are opposite.

[0022] Refer to Figures 3 to 5A fixed vertical plate 401 is fixedly installed on the inner top of the connecting box 1, and the fixed vertical plate 401 is fixedly connected to the fixed sleeve 402. A support ring 404 is fixedly installed on the inner wall of the elastic expansion piece 302 and at the position of the corresponding contraction section. A plurality of guide vanes 405 are fixedly installed in a circular array on the inner wall of the support ring 404. A short shaft is fixedly installed together at one end of the guide vane 405 close to the axis of the support ring 404. Both ends of the expansion airbag 403 are fixedly connected to the fixed ring 303. The guide vanes 405 are evenly distributed on the inner wall of the support ring 404. The hydrogen is guided to form a stable vortex through a special angle design. When the hydrogen flows through the variable diameter section, the streamlined structure at the front end of the guide vane 405 can disperse the impact of the airflow and comb the originally turbulent flow into an orderly laminar state.

[0023] The working principle of the present invention is as follows: By inserting the large diameter pipe 203 and the small diameter pipe 204 into the interior of the connection box 1 at the placement openings 206 on both sides of the connection box 1 respectively, when the large diameter pipe 203 and the small diameter pipe 204 are inserted into the interior of the connection box 1, the large diameter pipe 203 and the small diameter pipe 204 can be fixed on both sides of the connection box 1 through the self-centering chuck 201. When the large diameter pipe 203 and the small diameter pipe 204 are inserted into the interior of the connection box 1 and fixed, the set expansion tube 301 will fit the inner wall of the large diameter pipe 203 and the small diameter pipe 204, and the threaded rod 309 is driven to rotate by opening the rotating drive member 311 respectively. The threaded rod 309 will drive the external frame 307 to slide in the slide groove 205 by engaging with the rotating ring 308, and drive the hollow ring 306 to move in the opposite direction, and the moving hollow ring 306 will drive the inflatable ring 304 to move through the ventilation hose 305 and stretch the elastic expansion sheet 302 to extend on the inner wall of the expansion tube 301. As the hollow ring 306 moves continuously, it drives the ventilation hose 305 to contact the outer ring 316, so that the moving hollow ring 306 contacts the outer ring 316 through the ventilation hose 305 to stretch the inflatable ring 304 to expand in the expansion tube 301. The expanded inflatable ring 304 stretches the expansion tube 301 to spread (the gap of the notch will increase) and allows the expansion tube 301 and the inner walls of the large-diameter pipe 203 and the small-diameter pipe 204 to fit together to form an expansion section and a contraction section. Since the inner diameter of the large-diameter pipe 203 is larger than the inner diameter of the small-diameter pipe 204, the inner diameter of the expansion section is larger than the inner diameter of the contraction section (the inner diameter of the expansion airbag 403 is larger than the expansion section and the contraction section). By turning on the air pump device 312, air is input into the diverter 314 from one of its output ends. The diverter 314 inputs air into the inner annular airbag 317 and the hollow ring 306 respectively. The air input into the hollow ring 306 enters the inside of the inflatable ring 304 through the ventilation hose 305, causing the inflatable ring 304 and the expansion part to expand. The expanded expansion part can fill the gap in the notch and contact the end faces of the large-diameter pipe 203 and the small-diameter pipe 204, and expand and extend towards the outer wall of the expansion pipe 301. The air input into the inner annular airbag 317 causes the inner annular airbag 317 to expand inside the outer sleeve ring 316. The expanded inner annular airbag 317 will fit against the outer wall of the expansion pipe 301 and contact and squeeze the expansion part. In this way, after air is injected into the inflatable ring 304 and the inner annular airbag 317, they can expand and squeeze the expansion pipe 301 against each other. The provided expansion part can expand and contact the end faces of the large-diameter pipe 203 and the small-diameter pipe 204 and fill the notch opened in the expansion pipe 301, so that no air leakage occurs during the flow of hydrogen; It should be noted that after air is injected into the inflatable ring 304 and the inner annular airbag 317 and they can expand and squeeze the expansion pipe 301 against each other, and during the process that the provided expansion part can expand and fill the notch opened in the expansion pipe 301, when hydrogen flows along line a, the hydrogen will not impact the end face of the small-diameter pipe 204. In this way, hydrogen can effectively flow and be transported on the inner walls of the large-diameter pipe 203 and the small-diameter pipe 204, and avoid the displacement of the small-diameter pipe 204 caused by the impact of hydrogen on the end face of the small-diameter pipe 204 during hydrogen transportation, thereby avoiding the unstable connection between the small-diameter pipe 204 and the large-diameter pipe 203 caused by long-term hydrogen transportation and resulting in air leakage; Moreover, when the expansion pipe 301 is driven by the movement of the hollow ring 306 to stretch the ventilation hose 305 and inflate the inflatable ring 304, causing the expansion pipe 301 to expand outward and deform into an expansion section and a contraction section, the expansion pipe 301 will deform into a conical shape as a whole. The deformed conical angle is formed by the distance deformation between the outer wall of the expansion pipe 301 and the inner wall of the large-diameter pipe 203 (the stretched elastic expansion sheet 302 will fit against the inner wall of the expansion pipe 301 to form a sealed gradually changing conical flow cavity). Thus, when hydrogen flows from the gradually changing conical expansion section to the gradually changing conical contraction section, the double-gradually-changing conical design with a gradually shrinking conical expansion section provided at the large-diameter pipe 203 and a gradually expanding conical contraction section at the small-diameter pipe 204 can guide the acceleration or deceleration of hydrogen through a gentle cross-sectional area change, significantly reducing the impact force of the gas on the pipe wall, reducing turbulence and suppressing pipe vibration. Moreover, the double-conical flow cavity formed by the expansion section and the contraction section makes the flow velocity change gently through the cross-sectional area change, thereby suppressing the generation of turbulence; When hydrogen flows from the large-diameter pipeline 203 with a larger pipe diameter to the small-diameter pipeline 204 with a smaller pipe diameter, the installed flow monitoring element can detect the flow rate of hydrogen flowing in the large-diameter pipeline 203. When the hydrogen flow rate in the large-diameter pipeline 203 is too large and exceeds the set value, the flow monitoring element generates a corresponding electrical signal according to the hydrogen flow rate. The controller controls the voltage input to the gas pumping device 312 through the generated electrical signal. One output end of the gas pumping device 312 sucks out the air in the compression space through the air supply pipeline 313, creating a negative pressure in the compression space, so that the pressure in the expansion airbag 403 is higher than that in the compression space and expands. The internal space of the expanded expansion airbag 403 increases. Therefore, during the process of large-flow hydrogen entering the contraction section from the expansion section, the expandable expansion airbag 403 will expand or contract according to the hydrogen flow rate. When the large-flow hydrogen flows along line a, the expanded expansion airbag 403 can keep the large-flow hydrogen in a "temporary gas storage state". When hydrogen continuously enters the inside of the expansion airbag 403, the hydrogen can enter the small-diameter pipeline 204 from the expansion airbag 403 at a slower speed. According to the continuity equation of the mass conservation law and the Bernoulli equation of the energy conservation law in existing fluid mechanics, when the fluid flows from a pipe with a larger diameter to a pipe with a smaller diameter, the flow velocity of the fluid will increase. Specifically, it is manifested as: the pipe diameter becomes smaller → the cross-sectional area decreases → the flow velocity increases. Therefore, in order to avoid the situation where the flow velocity of hydrogen entering the small-diameter pipeline 204 is too fast and the hydrogen discharge amount is out of control, the installed expansion airbag 403 can adjust its own expansion rate according to the hydrogen flow rate in the large-diameter pipeline 203, so that when the large-flow hydrogen in the large-diameter pipeline 203 flows along line a to the small-diameter pipeline 204, it enters the expansion airbag 403 to slow down the flow velocity of hydrogen, and then the hydrogen enters the small-diameter pipeline 204 from the expansion airbag 403 at a slower speed, thereby controlling the hydrogen flow velocity and preventing the hydrogen with a faster flow velocity from being discharged too fast when hydrogen is needed later, making it impossible for humans to control the hydrogen discharge amount; It should be noted that when the hydrogen flow rate in the large-diameter pipeline 203 is small, the installed gas pumping device 312 can inject air into the compression space, causing the expansion airbag 403 to retract, so as to avoid the situation where the installed expansion airbag 403 completely slows down the hydrogen flow velocity when hydrogen flows from the large-diameter pipeline 203 to the small-diameter pipeline 204, resulting in abnormal hydrogen flow.

[0024] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen pipeline connection device, characterized in that, Comprising: Connection box (1); Fixing component (2), the fixing component (2) includes placing openings (206) formed on both sides of the connection box (1); Connection component (3), the connection component (3) includes a large-diameter pipe (203) and a small-diameter pipe (204) fixedly installed in the placing opening (206), the connection component (3) further includes two expansion pipes (301) arranged on the inner walls of the large-diameter pipe (203) and the small-diameter pipe (204), a plurality of notches are circumferentially arrayed on the outer wall of the expansion pipe (301), and the expansion pipe (301) is driven to fit with the inner walls of the large-diameter pipe (203) and the small-diameter pipe (204); Adjusting component (4), the adjusting component (4) includes a fixing sleeve (402) integrally formed between the two expansion pipes (301), an expansion airbag (403) is arranged in the fixing sleeve (402), and a compression space is formed between the fixing sleeve (402) and the expansion airbag (403); Wherein, after the expansion pipe (301) fits with the inner wall of the large-diameter pipe (203), an expansion section is formed, an expansion section is formed inside the expansion airbag (403), after the expansion pipe (301) fits with the inner wall of the small-diameter pipe (204), a contraction section is formed, a flow monitoring element is arranged in the expansion section, the flow monitoring element is electrically connected to a controller, taking the expansion section as the starting point, the contraction section as the end point, and the length direction of the connection box (1) as the a-line, hydrogen flows in the a-line direction.

2. The hydrogen pipeline connection device according to claim 1, characterized in that, Two chutes (205) are symmetrically formed on the upper end face of the connection box (1), a partition (202) is fixedly installed on the upper end face of the connection box (1) and between the chutes (205), and self-centering chucks (201) for fixing the large-diameter pipe (203) and the small-diameter pipe (204) are fixedly installed on both sides of the connection box (1) at positions corresponding to the placing openings (206).

3. The hydrogen pipeline connection device according to claim 2, characterized in that, A fixing ring (303) is fixedly installed on the inner wall of the expansion pipe (301) near the expansion airbag (403), an elastic telescopic sheet (302) is fixedly installed at one end of the fixing ring (303) away from the expansion airbag (403), an inflation ring (304) is fixedly installed on the side of the elastic telescopic sheet (302) away from the expansion airbag (403), a plurality of expansion parts are integrally formed on the outer wall of the inflation ring (304) and in the notches, and a ventilation hose (305) is communicated with the outer wall of the expansion part, and one end of the ventilation hose (305) away from the inflation ring (304) is communicated with a hollow ring (306).

4. A hydrogen pipeline connection device according to claim 3, characterized in that Brackets (315) are symmetrically installed on the inner wall of the connection box (1), an outer sleeve ring (316) arranged on the outer wall of the expansion pipe (301) is fixedly installed at one end of the bracket (315), and an inner annular airbag (317) is fixedly installed on the inner wall of the outer sleeve ring (316).

5. The hydrogen pipeline connection device according to claim 4, characterized in that, The inner bottom end of the connection box (1) is fixedly installed with a pump air device (312), the pump air device (312) is electrically connected to a controller, the pump air device (312) has two output ends, one of the output ends is fixedly installed with a gas supply pipeline (313), and the other output end is fixedly installed with a diverter (314), and the diverter (314) is respectively communicated with the hollow ring (306) and the inner annular airbag (317).

6. The hydrogen pipeline connection device according to claim 5, characterized in that The outer wall of the hollow ring (306) is fixedly installed with an external connection frame (307), the external connection frame (307) penetrates through the sliding groove (205) and extends upward, the upper end face of the connection box (1) is symmetrically installed with two fixing plates (310), and the relative sides of the two fixing plates (310) are fixedly connected with a rotary driving member (311). The output end of the rotary driving member (311) penetrates through the fixing plate (310) and is fixedly installed with a threaded rod (309). The threaded rod (309) is rotatably connected to the fixing plate (310) and the partition plate (202). A rotating collar (308) is threadedly connected to the threaded rod (309), and the rotating collar (308) is rotatably connected to the external connection frame (307). The spiral directions of the threads on the two threaded rods (309) are opposite.

7. The hydrogen pipeline connection device according to claim 3, characterized in that, The inner top end of the connection box (1) is fixedly installed with a fixed vertical plate (401), the fixed vertical plate (401) is fixedly connected to a fixed sleeve (402), a support collar (404) is fixedly installed on the inner wall of the elastic telescopic piece (302) at the position corresponding to the contraction section, and a plurality of flow guide vanes (405) are fixedly installed in a circumferential array on the inner wall of the support collar (404). One end of the flow guide vane (405) close to the axis of the support collar (404) is fixedly installed with a short shaft, and both ends of the expansion airbag (403) are fixedly connected to the fixed ring (303).

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