A dual-channel high-pressure hydrogen gas rotary joint, a loading and unloading arm, and a hydrogen gas loading and unloading system

Abstract

This invention provides a dual-channel high-pressure hydrogen rotary joint, comprising: a rotary valve core having an axially extending central blind hole and a displacement gas passage; a valve core sleeve fitted onto the rotary valve core, the side wall of the valve core sleeve having a through hole; and a valve core seat fixedly connected to the valve core sleeve, the valve core seat having multiple axially distributed through holes in the circumferential direction, and the rotary valve core having multiple circumferentially distributed radial through holes; wherein the through holes communicate with the displacement gas passage to form a displacement gas channel, and the central blind hole, the radial through holes, and the axial through holes are sequentially connected to form a high-pressure hydrogen channel, the rotary valve core being configured to rotate relative to the valve core sleeve and to keep the displacement gas channel and the high-pressure hydrogen channel always in a conductive state. This invention also provides a loading / unloading arm and a hydrogen loading / unloading system.

Description

Technical Field

[0001] This invention belongs to the technical field of gaseous fuel refueling equipment, specifically relating to a dual-channel high-pressure hydrogen rotary joint, loading and unloading arm, and hydrogen loading and unloading system. Background Technology

[0002] In recent years, with the rapid development of the hydrogen energy industry, the demand for hydrogen as a new clean energy source has increased rapidly, especially with the continuous advancement of the demonstration operation and commercialization of hydrogen fuel cell vehicles. The number of hydrogen refueling stations in operation both domestically and internationally exceeds 300. Hydrogen is a colorless and odorless gas with characteristics such as low density, high diffusion coefficient, low ignition temperature, wide combustion and explosion range, and fast combustion flame speed, making it a highly flammable and explosive gas. Furthermore, hydrogen molecules are small and easily penetrate metals / organic materials, leading to leaks. Therefore, hydrogen leakage and explosion safety issues are particularly prominent. Hydrogen refueling stations store large amounts of high-pressure hydrogen; once a leak occurs, it can easily form a large-scale flammable gas cloud and may also trigger a violent explosion, posing a serious threat to personal safety and property. Hydrogen supply to refueling stations is primarily transported by road using tubular trailers. The loading and unloading time within the station is relatively long, and the reliability of the connection between the long-tube trailers and the loading and unloading pipelines determines the safety of the entire loading and unloading operation.

[0003] Currently, hydrogen tube bundle vehicle loading and unloading typically uses hoses with threaded connectors. After connection, a soapy water leak test is performed. If bubbling or other issues are detected, the hoses are tightened and tested again. Once passed, the filling pipeline is purged using nitrogen to replace the air inside. Loading and unloading operations can only proceed after the air content meets the standards. This method still has several problems. For example, large amounts of replacement gas can lead to the coexistence of air and hydrogen, and high-speed hydrogen injection can easily cause combustion and explosion accidents. The reliability of the connecting components used in hydrogen loading and unloading operations determines the overall safety of the loading and unloading area. Traditional threaded hose connections are cumbersome. The hydrogen hose and threaded connector are connected by crimping, which can easily lead to detachment, resulting in hydrogen leakage. Furthermore, the hydrogen hose cannot self-seal when separated from the threaded connector, and the breakaway valve cannot break it, causing high-speed hydrogen ejection and the metal hose to swing, potentially leading to friction sparks and combustion and explosion accidents. Therefore, using hoses for hydrogen loading and unloading poses significant safety hazards, and the safety issues of hydrogen tube bundle vehicle loading and unloading urgently need to be addressed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention aims to provide a dual-channel high-pressure hydrogen rotary joint, loading / unloading arm, and hydrogen loading / unloading system. Through the dual-channel high-pressure hydrogen rotary joint and its loading / unloading arm, in conjunction with the hydrogen loading / unloading connector, it enables the connection between the hydrogen loading / unloading column and the rigid pipe of the hydrogen tubing vehicle. It features reliable connection, dual-channel flow of hydrogen and replacement gas, and safe hydrogen release and replacement, effectively ensuring the safety of hydrogen tubing vehicle loading / unloading operations and significantly improving the overall reliability of the hydrogen loading / unloading connection equipment.

[0005] Therefore, according to a first aspect of the present invention, a dual-channel high-pressure hydrogen rotary joint is provided, comprising: a rotary valve core having an axially extending central blind hole and a displacement gas passage hole; a valve core sleeve sleeved on the rotary valve core, the side wall of the valve core sleeve having a through hole; and a valve core seat fixedly connected to the valve core sleeve, the valve core seat having a plurality of circumferentially distributed axial through holes, and the rotary valve core having a plurality of circumferentially distributed radial through holes; wherein the through holes communicate with the displacement gas passage hole to form a displacement gas channel, the central blind hole, the radial through holes, and the axial through holes are sequentially connected to form a high-pressure hydrogen channel, and the rotary valve core is configured to rotate relative to the valve core sleeve and to keep the displacement gas channel and the high-pressure hydrogen channel always in a conductive state.

[0006] In one embodiment, a valve head is further included, which is fixedly connected to the valve core seat, and the axial through hole communicates with the inner cavity of the valve head.

[0007] In one embodiment, the first end of the rotary valve core is provided with a disc-shaped base, and the displacement air passage is configured to include a first channel and a second channel communicating with the first channel.

[0008] The first channel extends radially along the disc-shaped base, the second channel extends axially along the rotary valve core, and the end of the first channel forms a first displacement air port. The through hole communicates with the end of the second channel and forms a second displacement air port.

[0009] In one embodiment, an annular groove is provided on the inner wall of the valve core sleeve, the through hole communicates with the annular groove, and the end of the second channel communicates with the annular groove, so that the through hole is always in communication with the displacement air passage.

[0010] In one embodiment, the inner wall of the valve core sleeve is provided with first sealing grooves spaced apart from each other, each of the first sealing grooves being located on both axial sides of the annular groove, and a first sealing element being installed in each of the first sealing grooves.

[0011] In one embodiment, the outer wall of the rotary valve core is provided with a first outer step, the inner wall of the valve core sleeve is provided with a first inner step, and a bearing is installed between the first outer step and the first inner step.

[0012] In one embodiment, the second end of the rotary valve core is provided with a boss extending axially, and a hollow cavity is formed in the middle of the valve core seat. A plane bearing is installed in the hollow cavity, and the boss is rotatably connected to the valve core seat through the plane bearing.

[0013] In one embodiment, the second end of the valve core sleeve is provided with an annular groove extending inward along the axial direction, and the first end of the valve core seat is provided with a cylindrical connecting part extending outward along the axial direction. A second sealing groove is provided on the inner wall of the cylindrical connecting part, and a second sealing element is installed in the second sealing groove. The valve core sleeve and the valve core seat are fixedly connected by fasteners, and a seal is formed by the cylindrical connecting part and the annular groove.

[0014] In one embodiment, a slit channel is formed between the axial end face of the valve core sleeve and the valve core seat, and the radial through hole communicates with the axial through hole through the slit channel.

[0015] In one embodiment, the inner wall of the valve core sleeve is further provided with a second inner step, and the inner wall of the valve core seat is provided with a third inner step. A first annular groove and a second annular groove are formed between the rotary valve core and the second inner step and the third inner step, respectively. The first annular groove and the second annular groove are respectively located on both sides of the radial through hole. Energy storage sealing rings are installed in the first annular groove and the second annular groove, respectively. Under the action of the bearing and the plane bearing, the rotary valve core can rotate relative to the valve core sleeve when there is high pressure gas inside it, thereby enabling the dual-channel high-pressure hydrogen rotary joint to rotate under pressure.

[0016] In one embodiment, the valve head is configured to include a tapered body and a cylindrical welded portion connected to a second end of the tapered body, the inner diameter of the tapered body being configured to decrease from a first end to a second end.

[0017] According to a second aspect of the present invention, a loading / unloading arm is provided, comprising: a plurality of dual-channel high-pressure hydrogen rotary joints as described above; a hydrogen pipeline, each of the dual-channel high-pressure hydrogen rotary joints being connected in the hydrogen pipeline and forming a rotating joint, and the hydrogen pipeline communicating with the high-pressure hydrogen channel; a displacement gas pipeline, the displacement gas pipeline communicating with the displacement gas channel; and a fixed column, the first end of the hydrogen pipeline being connected to the fixed column via a support frame; wherein the hydrogen pipeline is capable of rotating under pressure via the dual-channel high-pressure hydrogen rotary joints, thereby enabling the free end of the loading / unloading arm to move in three-dimensional space.

[0018] In one embodiment, the hydrogen pipeline is configured to include a plurality of sub-hydrogen pipelines, one end of which is configured as a flange and is fixedly connected to the first end of the rotary joint via the flange, and the other end of which is fixedly connected to the valve head by welding.

[0019] In one embodiment, a spring-type balancer is further included for maintaining the posture of the hydrogen pipeline and the dual-channel high-pressure hydrogen rotary joint. One end of the spring-type balancer is clamped onto the corresponding valve core sleeve, and the other end is installed on the corresponding hydrogen pipeline.

[0020] According to a third aspect of the present invention, a hydrogen loading and unloading system is provided, comprising: a loading and unloading arm as described above; a hydrogen loading and unloading connector connected to the free end of the loading and unloading arm, the hydrogen loading and unloading connector including a male end and a female end, the female end being provided with a displacement valve port, and the male end being used to connect to a hydrogen tubing vehicle; wherein the female end is fixedly connected to the hydrogen pipeline at the free end of the loading and unloading arm, the displacement valve port is connected to the displacement gas pipeline at the free end of the loading and unloading arm, and the loading and unloading arm allows the female end to move freely to align with the male end, thereby enabling pressurized connection or pressurized disconnection of the male end and the female end.

[0021] Compared with the prior art, the advantages of this application are:

[0022] The dual-channel high-pressure hydrogen rotary joint according to the present invention has a high-pressure hydrogen channel and a displacement gas channel. Through a multi-seal structure, the rotary valve core can still rotate smoothly between the valve core sleeve and the valve core seat even in the presence of high-pressure hydrogen, effectively ensuring the safe discharge of displacement gas before and after high-pressure hydrogen loading and unloading, and pipeline safety during high-pressure hydrogen loading and unloading. The hydrogen loading and unloading arm according to the present invention utilizes a combination of hydrogen pipelines and displacement gas pipelines with multiple dual-channel bidirectional rotary joints to form a high-pressure hydrogen flow pipeline and a displacement gas flow channel, realizing a rigid pipe connection between the loading and unloading pipeline and the hydrogen tubing vehicle, thereby ensuring the safety of hydrogen loading and unloading. The hydrogen loading and unloading system according to the present invention utilizes the cooperation between the hydrogen loading and unloading arm and the hydrogen loading and unloading joint. By rotating the handle of the hydrogen loading and unloading joint, the air inside the female end can be replaced before hydrogen loading and unloading, and the hydrogen inside the female end can be replaced after loading and unloading. The displacement gas is discharged at high altitude through the displacement gas channel of the hydrogen loading and unloading arm, greatly reducing the amount of hydrogen replaced and the risk of hydrogen replacement. Attached Figure Description

[0023] The invention will now be described with reference to the accompanying drawings.

[0024] Figure 1 The structure of the dual-channel high-pressure hydrogen rotary joint according to the present invention is shown.

[0025] Figure 2 The external structure of the dual-channel high-pressure hydrogen rotary joint according to the present invention is shown schematically.

[0026] Figure 3 The structure of the hydrogen loading and unloading system according to the present invention is shown schematically.

[0027] Figure 4 yes Figure 3 The diagram shows a top view of the hydrogen loading and unloading system.

[0028] Figure 5 The diagram schematically illustrates the connection structure between the loading arm and the hydrogen loading / unloading connector in a hydrogen loading / unloading system.

[0029] Figure 6 The structure of the hydrogen loading and unloading connector is shown.

[0030] Figure 7 The external structure of the hydrogen loading / unloading connector is shown schematically.

[0031] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0032] The present invention will now be described with reference to the accompanying drawings. It should be noted that these descriptions are provided merely to illustrate the principles of the invention and do not limit the scope of the invention.

[0033] Figure 1 and Figure 2 The structure of the dual-channel high-pressure hydrogen rotary joint 6 according to the present invention is shown. Figure 1 and Figure 2 As shown, the dual-channel high-pressure hydrogen rotary joint 6 includes a rotary valve core 601, a valve core sleeve 604, a valve core seat 612, and a valve head 614. The rotary valve core 601 has an axially extending central blind hole 6011 and a displacement gas passage 6012 inside. The valve core sleeve 604 is fitted onto the rotary valve core 601 and is rotatable relative to the rotary valve core 601. The side wall of the valve core sleeve 604 has a through hole that communicates with the displacement gas passage 6012 to form a displacement gas channel 101. The valve core seat 612 is fixedly connected to the valve core sleeve 604. The valve core seat 612 has multiple axially distributed through holes 6121 inside, and the rotary valve core 601 has multiple circumferentially distributed radial through holes 6013. The two ends of the radial through holes 6013 communicate with the central blind hole 6011 and the axial through holes 6121, respectively. The valve head 614 is fixedly connected to the valve core sleeve 604, and the inner cavity of the valve head 614 communicates with the axial through hole 6121. The central blind hole 6011, the radial through hole 6013, and the axial through hole 6121 are connected in sequence to form a high-pressure hydrogen channel 102. The rotating valve core 601 is configured to rotate relative to the valve core sleeve 604 and to keep the high-pressure hydrogen channel 102 always in a conductive state, while keeping the displacement gas channel 101 always in a conductive state.

[0034] like Figure 1 As shown, the first end of the rotary valve core 601 is provided with a disc-shaped base 6014. The displacement air passage 6012 is configured to include a first channel and a second channel communicating with the first channel. The first channel extends radially along the disc-shaped base 6014, and the second channel extends axially along the rotary valve core 601. The end of the first channel forms a first displacement air interface 602. The through hole communicates with the end of the second channel and forms a second displacement air interface 607.

[0035] In this embodiment, as Figure 2 As shown, the disc-shaped base 6014 has multiple threaded mounting holes 103 evenly distributed circumferentially. This allows the disc-shaped base 6014 to form a flange connection structure for connecting other pipelines, such as hydrogen pipelines (see below). To ensure a tight seal between the disc-shaped base 6014 and other pipelines, a sealing groove can be provided on the end face of the disc-shaped base 6014 at a radially outer position corresponding to the central blind hole 6011, where a seal can be installed.

[0036] According to one embodiment of the present invention, an annular groove is provided on the inner wall surface of the valve core sleeve 604, corresponding to the radially inner side of the second displacement air interface 607. A connecting hole penetrating the side wall of the valve core sleeve 604 is provided at the bottom of the second displacement air interface 607, and the second displacement air interface 607 communicates with the annular groove through the connecting hole, and the end of the second channel communicates with the annular groove. Thus, the second displacement air interface 607 communicates with the displacement air flow hole 6012. During the rotation of the valve core sleeve 604 relative to the rotating valve core 601, the second displacement air interface 607 can always maintain communication with the displacement air flow hole 6012 through the annular groove.

[0037] like Figure 1 As shown, the inner wall of the valve core sleeve 604 is provided with first sealing grooves spaced apart from each other, each first sealing groove being located on both sides of the annular groove. A first sealing element 605 is installed in each of the first sealing grooves. Preferably, the first sealing groove is a trapezoidal groove, and the first sealing element is an O-ring. At least two first sealing grooves can be provided. After the valve core sleeve 604 and the rotary valve core 601 are assembled, each O-ring 605 forms a seal under compression, thereby ensuring the sealing of the displacement gas flow hole 6012. This ensures that the displacement gas can only flow within the gas phase space formed by the displacement gas flow hole 6012 and the annular groove between the first displacement gas interface 602 and the second displacement gas interface 607, preventing leakage and diffusion of the displacement gas.

[0038] According to the present invention, a first outer step with its end face facing the second end is provided on the outer wall of the rotary valve core 601, and a first inner step with its end face facing the first end is provided on the inner wall of the valve core sleeve 604. A bearing 603 is installed between the first outer step and the first inner step. The valve core sleeve 604 is a tubular structure and is integrally fitted onto the outer circumferential surface of the rotary valve core 601. The first end of the valve core sleeve 604 and the rotary valve core 601 are rotatably connected by the bearing 603, thereby achieving smoother rotation between the valve core sleeve 604 and the rotary valve core 601.

[0039] like Figure 1 As shown, the second end of the rotary valve core 601 has an axially extending boss 6015. Simultaneously, a hollow cavity is formed in the middle of the valve core seat 612, and multiple axial through holes 6121 within the valve core seat 612 are located radially outward from the hollow cavity. A planar bearing 613 is installed within the hollow cavity. The boss 6015 at the end of the rotary valve core 601 is inserted into the hollow cavity and passes through the planar bearing 613. The outer ring of the planar bearing 613 is fixedly connected to the inner wall of the hollow cavity, and the inner ring of the planar bearing 613 is fixedly connected to the boss 6015, thereby forming a rotatable connection between the rotary valve core 601 and the valve core seat 612 through the planar bearing 613. This results in smoother rotation between the valve core seat 612 and the rotary valve core 601.

[0040] According to one embodiment of the present invention, the valve core seat 612 and the valve core sleeve 604 are assembled into an interlocking structure and are fastened together by fasteners 611, preferably fastening bolts. An annular groove extending axially inward is provided at the second end of the valve core sleeve 604, while a cylindrical connecting portion extending axially outward is provided at the first end of the valve core seat 612. The cylindrical connecting portion can be fitted into the annular groove. A second sealing groove is provided on the inner wall of the cylindrical connecting portion, and a second sealing element 610 is installed in the second sealing groove. Preferably, the second sealing groove is a trapezoidal groove, and the second sealing element is an O-ring. The valve core sleeve 604 and the valve core seat 612 are fixedly connected by the fasteners 611, and the cylindrical connecting portion fits into the annular groove to press the second sealing element 610, thereby forming a seal between the valve core sleeve 604 and the valve core seat 612.

[0041] like Figure 1 As shown, a slit channel is formed between the axial end faces of the valve core sleeve 604 and the valve core seat 612. The radial through hole 6013 on the rotary valve core 601 communicates with the axial through hole 6121 on the valve core seat 612 through the slit channel. Thus, a high-pressure hydrogen channel 102 is formed inside the dual-channel high-pressure hydrogen rotary joint 6, which consists of the central blind hole 6011, the radial through hole 6013, the slit channel, the axial through hole 6121, and the inner cavity of the valve head 614 connected in sequence.

[0042] In one embodiment, a second inner step with its end face facing the second end is provided on the inner wall of the valve core sleeve 604, and a third inner step with its end face facing the first end is provided on the inner wall of the valve core seat 612. After the dual-channel high-pressure hydrogen rotary joint 6 is assembled, a first annular groove and a second annular groove are formed between the rotary valve core 601 and the second and third inner steps, respectively. The first and second annular grooves are located on opposite sides of the radial through hole 6013, and energy storage sealing rings 608 are installed in the first and second annular grooves, respectively. Thus, the sealing between the rotary valve core 601 and the valve core sleeve 604 and the valve core seat 612 is achieved by the corresponding energy storage sealing rings 608, thereby ensuring the sealing of the high-pressure hydrogen channel 102 inside the dual-channel high-pressure hydrogen rotary joint 6. Preferably, the energy storage sealing ring 608 can be made of ultra-high molecular weight polyethylene material, which makes the energy storage sealing ring 608 self-lubricating.

[0043] Thus, the rotary valve core 601, under the action of the bearing 603, the boss 6015, and the plane bearing 613, forms a rotatable connection with the valve core sleeve 604. Furthermore, the radial through hole 6013 communicates with and remains connected to the axial through hole 6121 on the valve core seat 612 through the channel between the energy storage sealing rings 608. This structure of the rotary valve core 601 allows it to rotate smoothly relative to the valve core sleeve 604 even when high-pressure gas is present inside the dual-channel high-pressure hydrogen rotary joint 6, enabling the dual-channel high-pressure hydrogen rotary joint 6 to rotate under pressure, thus providing it with a pressurized rotation function.

[0044] According to the present invention, such as Figure 1 As shown, the valve head 614 is constructed comprising a conical body and a cylindrical welded portion connected to the second end of the conical body. The inner diameter of the conical body is configured to decrease from the first end to the second end, thereby forming a conical cavity inside the valve head 614. The first end of the valve head 614 has a stepped connecting portion with external threads, while the inner wall of the second end of the valve core seat 612 has internal threads. The external and internal threads of the valve head 614 and the valve core seat 612 are fitted together to form a fixed connection. The valve head 614 is welded to the hydrogen pipeline via the cylindrical welded portion.

[0045] According to the present invention, a loading / unloading arm 200 is also provided, such as Figure 3 As shown, the loading / unloading arm 200 includes a dual-channel high-pressure hydrogen rotary joint 6, a hydrogen pipeline 4, a displacement gas pipeline 5, and a fixed column 1. The hydrogen pipeline 4 is configured to include multiple sub-hydrogen pipelines 41, 42, 43, 44, 45, 46, and 47, which are connected sequentially. Adjacent sub-hydrogen pipelines are rotatably connected via the rotary joint 6, and each sub-hydrogen pipeline communicates with the high-pressure hydrogen flow channel 102 within the rotary joint 6. The displacement gas pipeline 5 is configured to include multiple sub-displacement gas pipelines 51, 52, 53, 54, 55, 56, and 57, each of which communicates with the displacement flow channel 101 within its respective rotary joint 6. The fixed column 1 is fixed to the hydrogen loading / unloading site using anchor bolts, and the first end of the hydrogen pipeline 4 is connected to the fixed column 1 via a support frame. The support frame includes an upper fixing plate and a lower fixing plate that are spaced apart and fixed to the fixed column 1. The first end of the hydrogen pipeline 4 is formed as a hydrogen interface 3, and the first end of the replacement gas pipeline 5 is formed as a replacement gas interface 2. The hydrogen pipeline 4 can rotate under pressure through the dual-channel high-pressure hydrogen rotary joint 6, thereby enabling the loading and unloading arm 200 to extend and rotate, thus allowing the free end of the loading and unloading arm 200 to move in three-dimensional space.

[0046] The hydrogen pipeline 4 is a rigid pipe. One end of the sub-hydrogen pipeline is constructed as a flange, which can be fitted to the disc-shaped base 6014 at the first end of the dual-channel high-pressure hydrogen rotary joint 6 to form a fixed connection. The other end of the sub-hydrogen pipeline is fixedly connected to the cylindrical welded part of the valve head 614 by welding.

[0047] The loading / unloading arm 200 also includes a spring-loaded balancer 10 for maintaining the orientation of the hydrogen pipeline 4 and the dual-channel high-pressure hydrogen rotary joint 6. (As...) Figure 3 As shown, one end of the spring-type balancer 6 is clamped onto the corresponding valve core sleeve 604, and the other end is installed on the corresponding hydrogen pipeline.

[0048] like Figure 3 and Figure 4 As shown, the hydrogen pipeline 4 includes a first sub-hydrogen pipeline 41, a second sub-hydrogen pipeline 42, a third sub-hydrogen pipeline 43, a fourth sub-hydrogen pipeline 44, a fifth sub-hydrogen pipeline 45, a sixth sub-hydrogen pipeline 46, and a seventh sub-hydrogen pipeline 47 connected in sequence. The hydrogen pipeline 4 is connected to the corresponding high-pressure hydrogen channel 102 within the dual-channel high-pressure hydrogen rotary joint 6, thus forming a channel for the flow of high-pressure hydrogen. Adjacent pipelines are connected via the dual-channel high-pressure hydrogen rotary joint 6, whereby each dual-channel high-pressure hydrogen rotary joint 6 serves as a universal joint and forms a corresponding joint of the loading / unloading arm 200. The displacement gas pipeline 5 includes a first sub-displacement gas pipeline 51, a second sub-displacement gas pipeline 52, a third sub-displacement gas pipeline 53, a fourth sub-displacement gas pipeline 54, a fifth sub-displacement gas pipeline 55, a sixth sub-displacement gas pipeline 56, and a seventh sub-displacement gas pipeline 57 connected in sequence. The displacement gas pipeline 5 is connected to the displacement gas channel 101 in the corresponding dual-channel high-pressure hydrogen rotary joint 6, thereby forming a channel for the flow of displacement gas. Thus, the loading and unloading arm 200 is formed as a dual-channel loading and unloading arm, which can realize the rapid connection between the long tube trailer and the loading and unloading pipeline, as well as realize the functions of gas displacement before and after hydrogen loading and unloading and high-pressure hydrogen loading and unloading.

[0049] like Figure 3 As shown, the first sub-hydrogen pipeline 41 and the second sub-hydrogen pipeline 42 are connected via a first universal joint 61. The first sub-hydrogen pipeline 41 is a straight pipe, passing through a central circular hole in the lower fixed plate to connect with it. The lower end (terminal end) of the first sub-hydrogen pipeline 41 forms a hydrogen interface 3, which is used to connect to the high-pressure hydrogen pipeline in the loading and unloading pipeline. The upper end of the first sub-hydrogen pipeline 41 is welded to the valve head 614 of the first universal joint 61. Simultaneously, the upper end of the first sub-displacement gas pipeline 51 is threadedly connected to the second displacement gas interface 607 of the first universal joint 61, and the lower end of the first sub-displacement gas pipeline 51 is provided with a displacement gas interface 2, which is connected to the displacement pipeline in the loading and unloading pipeline.

[0050] like Figure 3 As shown, the second sub-hydrogen pipeline 42 is a Z-shaped pipeline, and its lower end is fixedly connected to the disc-shaped base 6014 of the first universal rotary joint 61 via a flange. A fixed pipe is provided at the upper vertical end of the second sub-hydrogen pipeline 42, and a damping bearing 8 is provided in the upper fixed plate mounted on the fixed column 1. The fixed pipe at the upper vertical end of the second sub-hydrogen pipeline 42 is inserted into the damping bearing 8, allowing the second sub-hydrogen pipeline 42 to rotate horizontally around the Z-shaped vertical pipeline. In one embodiment, a diagonal bracket 7 is provided in the middle of the second sub-hydrogen pipeline 42, providing support for the second sub-hydrogen pipeline 42. The second sub-displacement gas pipeline 52 is fixed along the diagonal bracket 7.

[0051] The second sub-hydrogen pipeline 42 and the third sub-hydrogen pipeline 43 are connected via a second universal joint 62. The upper end of the second sub-hydrogen pipeline 42 is welded to the valve head 614 of the second universal joint 62. The third sub-hydrogen pipeline 43 is a 90-degree bend, and its lower end is fixedly connected to the disc-shaped base 6014 of the second universal joint 62 via a flange. Simultaneously, the lower end of the second sub-displacement gas pipeline 52 is threadedly connected to the first displacement gas interface 602 of the first universal joint 61, and the upper end of the second sub-displacement gas pipeline 52 is threadedly connected to the second displacement gas interface 607 of the second universal joint 62.

[0052] like Figure 4 As shown, the third sub-hydrogen pipeline 43 and the fourth sub-hydrogen pipeline 44 are connected via a third universal joint 63. The upper end of the third sub-hydrogen pipeline 43 is welded to the valve head 614 of the third universal joint 63. The fourth sub-hydrogen pipeline 44 is a Z-shaped pipeline, and its horizontal left end is fixedly connected to the disc-shaped base 6014 of the third universal joint 63 via a flange. To maintain the posture of the right side of the fourth sub-hydrogen pipeline 44 and the third universal joint 63, one end of the spring-type balancer 10 is clamped onto the third universal joint 63, and the other end is installed on the fourth sub-hydrogen pipeline 44. Simultaneously, one end of the third sub-displacement gas pipeline 53 is threadedly connected to the first displacement gas interface 602 of the second universal joint 62, and the other end is threadedly connected to the second displacement gas interface 607 of the third universal joint 63.

[0053] The fourth sub-hydrogen pipeline 44 and the fifth sub-hydrogen pipeline 45 are connected via the fourth universal joint 64. The vertical right end of the fourth sub-hydrogen pipeline 44 is welded to the valve head 614 of the fourth universal joint 64. The fifth sub-hydrogen pipeline 45 is a 90-degree bend, and its lower end is fixedly connected to the disc-shaped base 6014 of the fourth universal joint 64 via a flange. One end of the fourth sub-displacement gas pipeline 54 is threadedly connected to the first displacement gas interface 602 of the third universal joint 63, and the other end is threadedly connected to the second displacement gas interface 607 of the fourth universal joint 64.

[0054] like Figure 4 and Figure 5 As shown, the fifth sub-hydrogen pipeline 45 and the sixth sub-hydrogen pipeline 46 are connected via a fifth universal joint 65. The upper end of the fifth sub-hydrogen pipeline 45 is welded to the valve head 614 of the fifth universal joint 65. The sixth sub-hydrogen pipeline 46 is a 90-degree bend, and its left end is fixedly connected to the disc-shaped base 6014 of the fifth universal joint 65 via a flange. One end of the fifth sub-displacement gas pipeline 55 is threadedly connected to the first displacement gas interface 602 of the fourth universal joint 64, and the other end is threadedly connected to the second displacement gas interface 607 of the fifth universal joint 65.

[0055] The sixth sub-hydrogen pipeline 46 and the seventh sub-hydrogen pipeline 47 are connected via the sixth universal joint 66. The seventh sub-hydrogen pipeline 47 is a straight pipe, and its left end is fixedly connected to the disc-shaped base 6014 of the sixth universal joint 66 via a flange. The right end of the seventh sub-hydrogen pipeline 47 is threaded to the female end 92 of the hydrogen loading / unloading connector 9 (see below). The upper right end of the sixth sub-hydrogen pipeline 46 is welded to the valve head 614 of the sixth universal joint 66. Thus, each hydrogen pipeline is connected to the high-pressure hydrogen channel 102 within the corresponding universal joint. One end of the sixth sub-displacement gas pipeline 56 is threaded to the first displacement gas interface 602 of the fifth universal joint 65, and the other end is threaded to the second displacement gas interface 607 of the sixth universal joint 66. Meanwhile, one end of the seventh displacement gas pipeline 57 is threadedly connected to the first displacement gas interface 602 of the sixth universal rotary joint 66, and the other end is threadedly connected to the displacement gas valve port 93 of the hydrogen loading and unloading joint 9.

[0056] According to the present invention, a hydrogen loading and unloading system 300 is also provided, such as... Figures 3 to 5As shown, the hydrogen loading and unloading system 300 includes the loading and unloading arm 200 as described above and a hydrogen loading and unloading connector 9 connected to the free end of the loading and unloading arm 200. The hydrogen loading and unloading connector 9 includes a male end 91 and a female end 92, with the female end 92 having a displacement valve port 93. The male end 91 is used to connect to a hydrogen pipeline vehicle (tanker), and the female end 92 can connect to the hydrogen filling pipeline of a hydrogen refueling station via the loading and unloading arm 200. The female end 92 is fixedly connected to the hydrogen pipeline 4 at the free end of the loading and unloading arm 200, and the displacement valve port 93 is connected to the displacement gas pipeline 5 at the free end of the loading and unloading arm 200. The loading and unloading arm 200 allows the female end 92 to move freely to align with the male end 91, thereby enabling pressurized connection or disconnection of the male end 91 and the female end 92. In this application, the hydrogen loading / unloading connector 9 can be seen, for example, in Chinese patent application 202111572969.2 filed by the same applicant on November 21, 2021, entitled "A Quick Connector for a Hydrogen Tube Bundle Vehicle," which is incorporated herein by reference in its entirety. The male end 91 and the female end 92 can be quickly connected and disconnected, thereby enabling rapid connection and disconnection between the hydrogen tube bundle vehicle and the hydrogen filling pipeline. This facilitates rapid loading and unloading of the hydrogen tube bundle vehicle, which is highly beneficial for ensuring safety during the loading and unloading process and for ensuring the reliability of the seal at the connection between the hydrogen tube bundle vehicle and the hydrogen filling pipeline.

[0057] like Figure 6 and Figure 7 As shown, the male end 91 includes a male nozzle holder 911 for connection with a hydrogen tubing vehicle, a gas distribution valve 912 fixedly installed within the male nozzle holder 911, and a pilot valve adapted to the gas distribution valve 912. The pilot valve includes a pilot valve seat 914 and a pilot valve core 915 adapted to be installed within the pilot valve seat 914. The female end 92 includes a female nozzle holder 921, and a front end connected to the female nozzle holder 921 (… Figure 6 The nozzle sleeve 922 (located at the right end of the nozzle), the outlet valve core 923 located inside the nozzle sleeve 922, and the main valve core 924 mounted on the female nozzle seat 921 are all part of the nozzle assembly. The hydrogen loading / unloading connector 9, through the pilot valve seat 914 and the pilot valve's movement, allows the outlet valve core 923 to easily open the pilot valve seat 913 after the male and female connectors are connected, even if high-pressure hydrogen is present inside the male end 91. This opens the hydrogen flow channel, enabling high-pressure hydrogen loading and unloading. The high-pressure hydrogen is then transported to the unloading pipeline or hydrogen tubing vehicle at the rear end via the high-pressure hydrogen channel 102 of the hydrogen loading / unloading arm 6. The nozzle sleeve 922 is fixedly connected to the female nozzle seat 921 via the nozzle body 925. A handle 926 (see [link to handle]) is located outside the nozzle body 925. Figure 7 The handle 926 is connected to the handle gear 927 located inside the gun body 925. The handle 925 controls the rotation of the handle gear 927, with a rotation angle of 0-180°. By controlling the handle 926, the hydrogen loading / unloading connector 9 can be controlled to perform corresponding actions for hydrogen filling or unloading.

[0058] The dual-channel high-pressure hydrogen rotary joint 6 according to the present invention has a high-pressure hydrogen channel 102 and a displacement gas channel 101. Through a multi-seal structure, even in the presence of high-pressure hydrogen, the rotary valve core 601 can still rotate smoothly between the valve core sleeve 604 and the valve core seat 612, effectively ensuring the safe discharge of displacement gas before and after high-pressure hydrogen loading and unloading, and the pipeline safety during high-pressure hydrogen loading and unloading. The hydrogen loading and unloading arm 200 according to the present invention utilizes a combination of hydrogen pipelines and displacement gas pipelines with multiple dual-channel bidirectional rotary joints 6 to form a high-pressure hydrogen flow pipeline and a displacement gas flow channel, realizing a rigid pipe connection between the loading and unloading pipeline and the hydrogen tubing vehicle, thereby ensuring the safety of hydrogen loading and unloading. The hydrogen loading and unloading system 300 according to the present invention utilizes the cooperation between the hydrogen loading and unloading arm 200 and the hydrogen loading and unloading connector 9. By rotating the handle of the hydrogen loading and unloading connector 9, the air inside the female end 92 before hydrogen loading and unloading can be replaced, and the hydrogen inside the female end 92 after loading and unloading can be replaced. The replacement gas is discharged at high altitude through the replacement gas channel 101 of the hydrogen loading and unloading arm 200, which greatly reduces the amount of hydrogen replaced and the risk of hydrogen replacement.

[0059] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-channel high-pressure hydrogen rotary joint, comprising: A rotary valve core (601) is provided with a central blind hole (6011) extending axially and a displacement air passage (6012); A valve core sleeve (604) is fitted onto the rotary valve core, and the side wall of the valve core sleeve is provided with a through hole; A valve core seat (612) is fixedly connected to the valve core sleeve. The valve core seat is provided with a plurality of axial through holes (6121) evenly distributed in the circumferential direction. The rotary valve core is provided with a plurality of radial through holes (6013) evenly distributed in the circumferential direction. The through hole is connected to the displacement gas passage to form a displacement gas channel (101) for displacing hydrogen. The central blind hole, the radial through hole and the axial through hole are connected in sequence to form a high-pressure hydrogen channel (102). The rotary valve core is configured to rotate relative to the valve core sleeve and to keep the displacement gas channel and the high-pressure hydrogen channel in a conducting state at all times. The second end of the rotary valve core is provided with a boss (6015) extending along the axial direction, and a hollow cavity is formed in the middle of the valve core seat. A plane bearing (613) is installed in the hollow cavity, and the boss is rotatably connected to the valve core seat through the plane bearing. A slit channel is formed between the axial end face of the valve core sleeve and the valve core seat, and the radial through hole communicates with the axial through hole through the slit channel; The inner wall of the valve core sleeve is further provided with a second inner step, and the inner wall of the valve core seat is provided with a third inner step. A first annular groove and a second annular groove are formed between the rotary valve core and the second inner step and the third inner step, respectively. The first annular groove and the second annular groove are respectively located on both sides of the radial through hole. An energy storage sealing ring (608) is installed in the first annular groove and the second annular groove, respectively. The rotary valve core is able to rotate relative to the valve core sleeve when there is high pressure gas inside it, thereby enabling the dual-channel high-pressure hydrogen rotary joint to rotate under pressure. The dual-channel high-pressure hydrogen rotary joint also includes a valve head (614) fixedly connected to the valve core seat, and the axial through hole communicates with the inner cavity of the valve head.

2. The dual pass high pressure hydrogen gas swivel of claim 1, wherein, The first end of the rotary valve core is provided with a disc-shaped base (6014), and the displacement air passage is configured to include a first channel and a second channel communicating with the first channel. The first channel extends radially along the disc-shaped base, the second channel extends axially along the rotary valve core, and the end of the first channel forms a first displacement air port (602). The through hole communicates with the end of the second channel, and the through hole forms a second displacement air port (607).

3. The dual pass high pressure hydrogen gas swivel of claim 2, wherein, An annular groove is provided on the inner wall of the valve core sleeve, the through hole communicates with the annular groove, and the end of the second channel communicates with the annular groove, so that the through hole is always in communication with the displacement air passage.

4. The dual pass high pressure hydrogen gas swivel of claim 3, wherein, The inner wall of the valve core sleeve is provided with first sealing grooves spaced apart from each other, and each first sealing groove is located on both sides of the axial direction of the annular groove. A first sealing element (605) is installed in each of the first sealing grooves.

5. The dual pass high pressure hydrogen gas swivel of any one of claims 1 to 4, characterized in that, The outer wall of the rotary valve core is provided with a first outer step, and the inner wall of the valve core sleeve is provided with a first inner step. A bearing (603) is installed between the first outer step and the first inner step.

6. The dual pass high pressure hydrogen gas swivel of any one of claims 1 to 4, characterized in that, The second end of the valve core sleeve is provided with an annular groove extending inward along the axial direction, and the first end of the valve core seat is provided with a cylindrical connecting part extending outward along the axial direction. A second sealing groove is provided on the inner wall of the cylindrical connecting part, and a second sealing element (610) is installed in the second sealing groove. The valve core sleeve and the valve core seat are fixedly connected by fasteners (611), and a seal is formed by the cylindrical connecting part and the annular groove.

7. The dual pass high pressure hydrogen gas swivel of any one of claims 1 to 4, characterized in that, The valve head is configured to include a conical body and a cylindrical welded portion connected to a second end of the conical body, wherein the inner diameter of the conical body is configured to decrease from the first end to the second end.

8. A loading arm, comprising: Multiple dual-channel high-pressure hydrogen rotary joints according to any one of claims 1 to 7; Hydrogen pipeline (4), each of the dual-channel high-pressure hydrogen rotary joints is connected in the hydrogen pipeline and forms a rotating joint, and the hydrogen pipeline is connected to the high-pressure hydrogen channel; Displacement gas pipeline (5), wherein the displacement gas pipeline is connected to the displacement gas channel; A fixed column (1) is provided, and the first end of the hydrogen pipeline is connected to the fixed column via a support frame; The hydrogen pipeline can be rotated under pressure through the dual-channel high-pressure hydrogen rotary joint, thereby enabling the free end of the loading and unloading arm to move in three-dimensional space.

9. The handler arm of claim 8, wherein, The hydrogen pipeline is configured to include multiple sub-hydrogen pipelines. One end of each sub-hydrogen pipeline is configured as a flange and is fixedly connected to the first end of the rotary joint through the flange. The other end of each sub-hydrogen pipeline is fixedly connected to the valve head by welding.

10. Handling arm according to claim 8 or 9, characterized in that It also includes a spring-type balancer (10) for maintaining the posture of the hydrogen pipeline and the dual-channel high-pressure hydrogen rotary joint, one end of the spring-type balancer being clamped onto the corresponding valve core sleeve, and the other end being installed on the corresponding hydrogen pipeline.

11. A hydrogen loading and unloading system, comprising: The loading and unloading arm according to any one of claims 8 to 10; A hydrogen loading and unloading connector (9) is connected to the free end of the loading and unloading arm. The hydrogen loading and unloading connector includes a male end (91) and a female end (92). The female end is provided with a replacement gas valve port (93). The male end is used to connect to the hydrogen tubing vehicle. The female end is fixedly connected to the hydrogen pipeline at the free end of the loading and unloading arm, and the displacement gas valve port is connected to the displacement gas pipeline at the free end of the loading and unloading arm. The loading and unloading arm allows the female end to move freely to align with the male end, thereby enabling the pressurized connection or disconnection of the male end and the female end.

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