High pressure gas filling / unloading system

Abstract

The present invention discloses a high-pressure gas filling and unloading system, comprising a high-pressure gas pipeline for connecting to a gas filling station, a replacement gas pipeline for gas replacement, a plurality of double channel rotary joints arranged in the high-pressure gas pipeline and configured to be rotatable under pressure, and a filling and unloading joint arranged in a free end of the high-pressure gas pipeline and equipped with a control mechanism, the filling and unloading joint being configured to form a replacement working channel or a filling and unloading working channel in the filling and unloading joint via the control mechanism. The control mechanism is configured to selectively open the replacement working channel and the filling and unloading working channel so that the replacement working channel communicates with the replacement gas pipeline (500) for gas replacement, or the filling and unloading working channel communicates with the high-pressure gas pipeline (400) for filling and unloading high-pressure gas.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202111572969.2, entitled "Quick coupling for hydrogen tube bundle vehicle," filed on December 21, 2021, and Chinese Patent Application No. 202210857508.8, entitled "Double-channel high-pressure hydrogen rotary coupling, loading and unloading arm, and hydrogen loading and unloading system," filed on July 20, 2022, the entire contents of which are incorporated herein by reference.

[0002] [Technical field] The present invention relates to the technical field of a gas fuel filling and unloading device, and in particular to a high pressure gas filling and unloading device. [Background technology]

[0003] In recent years, with the rapid development of the new energy industry, the demand for high-pressure gases such as hydrogen and CNG (compressed natural gas) as new clean energy sources has been increasing rapidly. In particular, as the exemplary operation and practical application of hydrogen fuel cell vehicles progresses steadily, the construction of hydrogen filling stations is progressing both domestically and overseas.

[0004] However, existing gas filling stations still have problems such as low gas supply efficiency, inadequate safety risk prevention and management measures, and unsound safety specification systems. For example, regarding hydrogen filling stations, hydrogen is a colorless, odorless, flammable, and explosive gas, and has characteristics such as low density, high diffusion coefficient, low ignition temperature, wide combustion and explosion range, and fast flame speed. In addition, hydrogen molecules are small and easily permeate metals and organic matter and leak. Therefore, in the use of hydrogen energy, safety issues regarding hydrogen leakage and explosion are extremely important. Since a large amount of high-pressure gas is stored in a filling station, once a leakage occurs, a large flammable gas cloud can easily be formed, which may lead to a violent explosion, posing a serious threat to people's safety and property. Gas is basically supplied to the filling station through road transportation of tube bundle vehicles, and it takes a long time to fill and unload the high-pressure gas at the filling station. Therefore, the connection between the tank car and the filling and unloading pipeline determines the safety of the entire filling and unloading operation.

[0005] At present, hoses and threaded joints are usually used in high-pressure tube bundle vehicles for filling and unloading hydrogen, CNG, etc. After connecting the threaded joints, it is necessary to test for leakage with soapy water. If problems such as bubbling occur, the connections should be tightened and the leakage test should be performed again. After testing that the connections are qualified, the filling pipeline should be purged so that the air in the pipeline can be replaced with nitrogen. Before filling and unloading operations are performed, the air content should meet the specified standard. However, the above filling and unloading methods still have some defects. For example, when the amount of replacement gas is large, air and hydrogen may coexist, and high-speed hydrogen injection may lead to a combustion explosion accident. The filling pressure of hydrogen tube bundle vehicles is 20 MPa and is expected to increase to 45 MPa in the future. If hydrogen leakage is detected during filling and unloading of high-pressure hydrogen, the work should be stopped and the leaking point of the connection should be checked. After the connection is fixed and tested to be zero leakage, the filling and unloading work can be continued. The safety of the connection parts for filling and unloading operations of high-pressure gas ensures the safety of the entire filling and unloading area. However, the connection using the conventional screw joint hose is cumbersome to operate, and the high-pressure gas hose and the screw joint are connected by buckling, which is easy to come off. As a result, high-pressure gas may leak from the connection, the connection efficiency is poor, and the sealing reliability of the connection is also low. In addition, the high-pressure gas hose and the screw joint are not automatically sealed after being uncoupled, and the withdrawal valve is not pulled out, so the high-pressure gas will spray out at high speed and the metal hose will be thrown away. The resulting friction sparks are very likely to cause combustion and explosion. Therefore, the hose in the filling and unloading of high-pressure gas poses a great safety risk, and it is urgent to address the safety concerns of filling and unloading of high-pressure gas by tube bundle vehicles. A new type of high-pressure gas filling and unloading system is urgently needed for high-pressure gas filling and unloading operations by low-density and high-pressure transportation. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above technical problems, the present invention aims to propose a high-pressure gas filling and unloading system that can connect a high-pressure gas filling and unloading column and a high-pressure gas tube bundle vehicle through a double-channel rotary joint, a filling and unloading arm, and a filling and unloading joint. With functions such as reliable connection, double-channel circulation for high-pressure gas and replacement gas, and high-pressure gas safety relief and replacement, the system can effectively ensure the safety of the filling and unloading work of the high-pressure gas tube bundle vehicle, and greatly improve the reliability of the entire connection for filling and unloading of high-pressure gas. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present invention proposes a high-pressure gas filling and unloading system, comprising a high-pressure gas pipeline for connecting to a gas filling station, a replacement gas pipeline for gas replacement, a plurality of double channel rotary joints arranged in the high-pressure gas pipeline and configured to be rotatable under pressure, and a filling and unloading joint arranged at a free end of the high-pressure gas pipeline and equipped with a control mechanism, the filling and unloading joint being configured to form a replacement working channel or a filling and unloading working channel in the filling and unloading joint via the control mechanism. The control mechanism is configured to selectively open the replacement working channel and the filling and unloading working channel so that the replacement working channel communicates with the replacement gas pipeline for gas replacement, or the filling and unloading working channel communicates with the high-pressure gas pipeline (400) for filling and unloading high-pressure gas.

[0008] In one embodiment, the high pressure gas has a pressure in the range of 10 to 50 MPa, and the high pressure gas is preferably hydrogen, CNG or helium.

[0009] In one embodiment, the filling and unloading fitting further comprises a male end unit for connecting to a high pressure gas transport vehicle or a gas fuel system, and a female end unit for fixed connection to the high pressure gas pipeline, and the control mechanism is disposed in the female end unit.

[0010] In one embodiment, the female end unit comprises a female housing, a valve core assembly within the female housing, and a bypass replacement conduit formed within the female housing, an internal cavity of the female end unit may communicate with the bypass replacement conduit to form a female replacement flow passage. The valve core assembly is configured to be actuated by the control mechanism to move axially relative to the female housing, thereby closing off the female replacement flow passage and forming a female fill and remove flow passage within the female end unit.

[0011] In one embodiment, the control mechanism is configured to drive the valve core assembly to move axially, whereby the male pilot passage and the female replacement passage in the male end unit are alternatively connected to the internal cavity of the female end unit for gas replacement, and the female filling / removal passage communicates with the male filling / removal passage in the male end unit for filling / removing high pressure gas, thereby opening the filling / removal work passage.

[0012] In one embodiment, the control mechanism includes a handle gear provided in the female housing and a transmission gear meshed with the handle gear, the transmission gear being formed on the outer circumferential surface of the valve core assembly, and a transmission gear that drives the valve core assembly to move axially relative to the female housing by rotating the handle gear. The handle gear has three control positions, and by rotating the handle gear alternatively between a first position and a second position, the female replacement flow passage is alternatively opened and closed, thereby enabling gas replacement via the female replacement flow passage, and when the handle gear is in a third position, the filling and unloading working channel is opened for the filling and unloading of high pressure gas.

[0013] In one embodiment, the female housing includes a female gun base having a connecting end, a gun body and a gun sleeve secured in turn to a front end of the female gun base, and the bypass replacement line is disposed within the gun body.

[0014] In one embodiment, the valve core assembly includes an outlet valve core and a main valve core, the outlet valve core is installed in the gun sleeve via an outlet valve core sleeve, and the main valve core is installed on the female gun base via a main valve core base and is actuated by the handle gear.

[0015] In one embodiment, the outlet valve core includes a hollow tube body and a solid umbrella member provided at one end of the hollow tube body, the solid umbrella member being provided with a first inclined through hole and a second inclined through hole on each axial side of the solid umbrella member, the first inclined through hole and the second inclined through hole being configured to be sealed to each other to form a self-sealing state of the female end unit thereby sealing the outlet valve core from the main valve core, or to be in communication with each other to connect the outlet valve core and the main valve core.

[0016] In one embodiment, a third elastic member is provided between the outlet valve core and the main valve core, and the solid umbrella member is configured to abut and form a seal against an inclined surface formed in the outlet valve core sleeve by the action of the third elastic member, or to disengage from the inclined surface, so that the first inclined through hole and the second inclined through hole are sealed with each other or communicate with each other.

[0017] In one embodiment, a third annular space is formed between the main valve core base and the female gun base and communicates with the connection end of the female gun base, and when the handle gear is in the third position, the main valve core communicates with the third annular space, thereby opening the female filling and unloading passages.

[0018] In one embodiment, the main valve core base has a cylindrical structure having a closed end with an inclined through hole communicating with the connection end of the female gun base, and a switching hole is provided in a side wall of the main valve core base, and the inclined through hole communicates with the switching hole via the third annular space.

[0019] In one embodiment, third through holes are distributed in a side wall of the main valve core, and the third through holes are configured to be offset from or aligned with the switching hole upon axial movement of the main valve core relative to the female housing, thereby closing or opening the female filling and unloading passages.

[0020] In one embodiment, a fourth through hole is further provided in a side wall of the main valve core, and a second accumulator seal ring is provided between the main valve core and the outlet valve core sleeve, and the fourth through hole is positioned axially inside the second accumulator seal ring to open the female replacement flow passage, or positioned axially outside the second accumulator seal ring to close the female replacement flow passage, depending on the axial movement of the main valve core.

[0021] In one embodiment, the male end unit includes a male gun base, a diverter valve fixedly mounted within the male gun base, and a pilot valve adaptively cooperating with the diverter valve, an axial end face of the pilot valve closely fitting with an axial end face of the valve core assembly when the male end unit is connected to the female end unit, the pilot valve configured to define the male pilot flow passage within the male end unit when the handle gear is in the second position, and to define the male fill and remove flow passages within the male end unit when the handle gear is in the third position.

[0022] In one embodiment, the pilot valve includes a pilot valve seat and a pilot valve core adaptively cooperating with the pilot valve seat, a first annular space communicating with the diverter valve is defined between the pilot valve seat and the male gun base, and a second annular space is defined between the pilot valve core and the male gun base. When the handle gear is in the first position and the second position, the first annular space and the second annular space are sealed off from each other, thereby closing the male fill and remove flow passages. When the handle gear is in the third position, the first annular space communicates with the second annular space, thereby opening the male fill and remove flow passages.

[0023] In one embodiment, the pilot valve core comprises a hollow tube inserted into the pilot valve seat and a valve head connected to one end of the hollow tube, the valve head comprising a central through hole communicating with the hollow tube and a plurality of inclined holes extending through the valve head and evenly distributed circumferentially, the inclined holes communicating with the second annular space.

[0024] In one embodiment, a plurality of first through holes are evenly distributed around the circumference of the hollow tube, and a plurality of second through holes are evenly distributed around the circumference of the pilot valve seat. When the handle gear is in the first position and the third position, the first through holes are offset from the second through holes to close the male pilot passage. When the handle gear is in the second position, the first through holes communicate with the second through holes to open the male pilot passage.

[0025] In one embodiment, a grip sleeve assembly is provided at a forward end of the gun sleeve and includes a grip sleeve (16) disposed on the exterior of the gun sleeve, a jaw support sleeve (14) disposed on the interior of the gun sleeve, and a jaw (18) extending through the gun sleeve, the grip sleeve assembly being configured such that the jaws form an axial restriction against the grip sleeve and thereby form a self-sealing seal with the female end unit, and the radial position of the jaws is configured to be restricted by axially compressing the jaw support sleeve, thereby connecting and sealing the female end unit to or disconnecting it from the male end unit.

[0026] In one embodiment, a replacement gas flow passage communicating with the replacement gas line and a high pressure gas flow passage communicating with the high pressure gas line are provided within the dual channel rotary joint.

[0027] In one embodiment, the dual channel rotary joint comprises a rotary valve core having a central blind hole and a replacement gas flow hole extending along an axial direction, and a valve core sleeve disposed around the rotary valve core and having a port extending through a side wall thereof, the valve core sleeve being configured to rotate relative to the rotary valve core such that the replacement gas flow hole is always in communication with the port to form the replacement gas flow path.

[0028] In one embodiment, the port includes the sidewall through hole and an annular groove formed in the inner wall of the valve core sleeve, the annular groove communicating with the sidewall through hole and the replacement gas flow hole communicating with the annular groove, such that the port remains in communication with the replacement gas flow hole.

[0029] In one embodiment, the dual channel rotary joint further comprises a valve core seat fixedly connected to the valve core sleeve, a plurality of axial through holes evenly distributed circumferentially inside the valve core seat, and a valve head fixedly connected to the valve core seat, wherein a central blind hole extending along the axial direction and a plurality of radial through holes evenly distributed circumferentially are provided in the rotary valve core, and the central blind hole, the radial through holes, the axial through hole, and the internal cavity of the valve head are sequentially connected to form the high-pressure gas flow path.

[0030] In one embodiment, an axially extending protrusion is provided on the second end of the rotary valve core and is rotatably connected to the valve core seat via a planar bearing.

[0031] In one embodiment, the valve core sleeve and the valve core seat are mutually-embedded, fixedly connected to each other to form a seal, a slot passage is formed between the axial end faces of the valve core sleeve and the valve core seat, and the radial through hole is in communication with the axial through hole via the slot passage. Effect of the Invention

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The double channel rotary joint used in the high pressure gas filling and unloading system according to the present invention has a high pressure gas flow path and a replacement gas flow path. Due to the multiple seal structure of the high pressure gas filling and unloading system, the rotary valve core can rotate smoothly between the valve core sleeve and the valve core seat even when high pressure gas is present, and can effectively ensure the safe discharge of replacement gas before and after filling and unloading of high pressure gas, and the safety of the pipeline during filling and unloading of high pressure gas. The high pressure gas filling and unloading arm according to the present invention forms a high pressure gas flow pipeline and a replacement gas flow path by combining a high pressure gas pipeline and a replacement gas pipeline with a plurality of double channel rotary joints, and realizes a hard-pipeline connection between the filling and unloading pipeline and the high pressure gas bundle vehicle, thereby ensuring the safety of the pipeline during filling and unloading of high pressure gas. By cooperation of the high pressure gas filling and extraction arm and the filling and extraction joint, the high pressure gas filling and extraction system of the present invention can realize the replacement of air in the female end unit before filling and extracting high pressure gas, and the replacement of high pressure gas in the female end unit after filling and extracting by rotating the handle of the filling and extraction joint. The replacement gas is discharged overhead through the replacement gas pipe of the high pressure gas filling and extraction arm, greatly reducing the replacement amount and risk of high pressure gas. [Brief description of the drawings]

[0034] The present invention will now be described with reference to the accompanying drawings. [Figure 1] 1 is a schematic diagram showing the structure of a high-pressure gas filling and unloading system according to the present invention. [Diagram 2] FIG. 2 shows the structure of the filling and unloading joint when the male end unit is separated from the female end unit in the high-pressure gas filling and unloading system shown in FIG. [Diagram 3] Shown is the connection between the male and female end units of the fill-and-discharge fitting. [Figure 4] The pilot valve of the fill and unfill fitting is shown in the open position. [Diagram 5] The internal channel of the fill-and-discharge fitting is shown in the open state. [Figure 6] The gas exchange channel of the filling and unloading fitting is shown in the open state. [Figure 7] FIG. 1 is a perspective view of a fill-and-unfill joint. [Figure 8] 1 shows the structure of a double-channel rotary joint of a high-pressure gas filling and unloading system according to the present invention. [Figure 9] FIG. 9 is a schematic diagram showing the external structure of the double channel rotary joint shown in FIG. [Figure 10] FIG. 2 is a top view of the high-pressure gas filling and removal system shown in FIG. 1. [Figure 11] 1 shows a schematic diagram of the connection between the filling and removal arm and the filling and removal fitting in a high pressure gas filling and removal system.

[0035] In this application, all accompanying drawings are merely schematic and are not necessarily drawn to scale, provided for illustrating the principles of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] The present invention will now be described with reference to the accompanying drawings. It should be noted that the following detailed description is provided only for the purpose of illustrating the principles of the present invention, and is not intended to limit the protection scope of the present invention.

[0037] FIG. 1 is a schematic diagram showing the structure of a high-pressure gas filling and unloading system 100 according to the present invention. As shown in FIG. 1, the high-pressure gas filling and unloading system 100 includes a filling and unloading arm 100b and a filling and unloading joint 100a provided at the free end of the filling and unloading arm 100b. The filling and unloading arm 100b includes a high-pressure gas pipeline 400 and a replacement gas pipeline 500 for connecting to a high-pressure gas filling station (i.e., a hydrogen station), and a plurality of double channel rotary joints 600 provided in the high-pressure gas pipeline 400, each of which is formed as a rotary joint of the high-pressure gas pipeline 400. A replacement gas flow path 600a and a high-pressure gas flow path 600b are provided inside the double channel rotary joint 600, and the high-pressure gas pipeline 400 communicates with the high-pressure gas flow path 600b, and the replacement gas pipeline 500 communicates with the replacement gas flow path 600a. Thus, the filling and unloading arm 100b is formed as a dual-channel filling and unloading arm having a high-pressure gas line 400 and a replacement gas line 500. During each rotation of the dual-channel rotary joint 600, the high-pressure gas line 400 and the replacement gas line 500 are independent of each other and do not affect each other, which significantly improves the flexibility and safety of the filling and unloading arm 100b. The high-pressure gas line 400 can rotate under pressure via the dual-channel rotary joint 600, which allows the free end of the filling and unloading arm 100b to move in three-dimensional space. The filling and unloading joint 100a includes a male end unit 200, a female end unit 300, and a control mechanism. The male end unit 200 is connected to a high-pressure gas transport vehicle or a gas-fuelled device. The high-pressure gas transport vehicle may be, for example, a high-pressure gas bundle vehicle, and the gas-fuelled device may be, for example, a vehicle or device fueled by high-pressure gas such as hydrogen, natural gas, etc. The female end unit 300 is fixedly connected to a high pressure gas line 400. The fill-and-remove fitting 100a is connected to the free end of the fill-and-remove arm 100b. The male end unit 200 is configured to mate with the female end unit 300 to form a replacement working channel or a fill-and-remove working channel within the fill-and-remove fitting 100a.Through the filling / removal arm 100b, the female end unit 300 can move freely to align with the male end unit 200, and the male end unit 200 and the female end unit 300 can be connected or disconnected by pressure. The filling / removal joint 100a is configured to selectively open the replacement working channel and the filling / removal working channel by a control mechanism, so that the replacement working channel communicates with the replacement gas pipe 500 for gas replacement, or the filling / removal working channel communicates with the high pressure gas pipe 400 for high pressure gas filling / removal. In this way, the filling / removal joint 100a can switch channels and adapt to the free switching of the working state of the filling / removal arm 100b, thereby realizing the safe replacement of gas in the pipe and the filling / removal of high pressure gas. It should be noted that in this specification, "opening" includes opening or forming.

[0038] The high pressure gas filling / unloading system 100 according to the present invention can fill high pressure gas (e.g., hydrogen, CNG or helium filled, unloaded or transported by a long tube trailer). The pressure of the high pressure gas is 10 to 50 MPa.

[0039] FIG. 2 shows the structure of the filling and unloading joint 100a according to the present invention when the male end unit 200 of the filling and unloading joint 100a is separated from the female end unit 300 (i.e., in the first state). As shown in FIG. 2, the filling and unloading joint 100a includes the male end unit 200 and the female end unit 300. The male end unit 200 is connected to a high-pressure gas bundle vehicle (tank car), and the female end unit 300 is connected to a filling and unloading pole of a gas filling station. The male end unit 200 and the female end unit 300 can be quickly attached and detached from each other, thereby realizing quick attachment and detachment between the high-pressure gas bundle vehicle and the high-pressure gas filling pipeline, which is very helpful in ensuring the safety of filling and unloading between the high-pressure gas bundle vehicle and the high-pressure gas filling pipeline, and the reliability of the seal of the connection. In this way, quick filling and unloading of the high-pressure gas bundle vehicle is realized. When the male end unit 200 is removed from the female end unit 300, the fill-and-remove coupling 100a is in a first state. When the male end unit 200 is connected to the female end unit 300, the fill-and-remove coupling 100a is in a second state.

[0040] According to the present invention, as shown in FIG. 2, the female end unit 300 includes a female housing, a valve core assembly disposed in the female housing, and a bypass replacement conduit 40 formed in the female housing. The internal cavity of the female end unit 300 is configured to communicate with the bypass replacement conduit 40 to form a female replacement flow passage. The valve core assembly is configured to move axially relative to the female housing to close the female replacement flow passage and form a female filling and removal flow passage in the female end unit 300. A control mechanism provided in the female end unit 300 is configured to drive the axial movement of the valve core assembly so that the male pilot flow passage and the female replacement flow passage are alternatively communicated with the inside of the female end unit 200, and controls the replacement operation flow passage for gas replacement. Furthermore, the axial movement of the valve core assembly driven by the control mechanism causes the male filling and removal flow passage to communicate with the female filling and removal flow passage, thereby opening the filling and removal operation channel to fill or remove high pressure gas. The control mechanism includes a handle gear 29 provided in the female housing and a transmission gear 282 meshing with the handle gear 29. The transmission gear 282 is formed on the outer circumferential surface of the valve core assembly. Rotation of the handle gear can drive the valve core assembly to move axially relative to the female housing. The handle gear has three control positions. When the handle gear 29 is rotated to the first position and the second position, respectively, the female replacement passage is selectively opened and closed, thereby enabling gas replacement through the female replacement passage. When the handle gear 29 is in the third position, the filling and unloading working passage is opened for filling or unloading high pressure gas.

[0041] As shown in FIG. 2, the female housing includes a female gun base 34 having a mounting end, a gun sleeve 12 attached to the front end (left end in FIG. 3) of the female gun base 34, and a gun body 27 fixedly connected between the female gun base 34 and the gun sleeve 12. A bypass replacement line 40 is disposed inside the gun body 27. The valve core assembly includes an outlet valve core 13 disposed in the gun sleeve 12 and a main valve core 28 provided on the female gun base 34. The outlet valve core 13 is disposed in the gun sleeve 12 via an outlet valve core sleeve 15. The main valve core 28 is disposed on the female gun base 34 via a main valve core base 33 and is operable by a handle gear 29. In this specification, the term "front end" refers to the end of the female end unit 300 that is away from the high pressure gas filling line of the gas filling station when connected, and the term "rear end" refers to the end of the female end unit 300 that is close to the high pressure gas filling line of the gas filling station when connected.

[0042] 2, the gun sleeve 12 has a cylindrical structure. An internal thread is provided at the right end of the gun sleeve 12, and an external thread is provided at the left end of the gun body 27, so that the gun sleeve 12 is connected to the gun body 27 via the threads.

[0043] According to the present invention, as shown in FIG. 2, the outlet valve core 13 includes a hollow tube body and a solid umbrella member provided at one end of the hollow tube body, and a first inclined through hole 131 and a second inclined through hole 132 are provided on both axial sides of the solid umbrella member. The outlet valve core sleeve 15 has a cylindrical structure. An external thread is provided on the right side of the outlet valve core sleeve 15, and an internal thread is provided on the left side of the gun body 27, and the outlet valve core sleeve 15 is connected to the gun body 27 through the thread. An arc groove is provided along the circumferential direction at the right end of the outlet valve core sleeve 15, and an O-ring seal 25 is installed in the arc groove to ensure the sealing property at the connection surface between the outlet valve core sleeve 15 and the gun body 27. A trapezoidal groove and a rectangular groove are provided on the inner wall of the outlet valve core sleeve 15, and the rectangular groove is provided on the axial inner side of the trapezoidal groove. An O-ring seal 19 is installed in the trapezoidal groove, and an O-ring seal 20 is installed in the rectangular groove. The outer wall surface of the left cylindrical portion of the outlet valve core 13 is in close contact with the O-ring seal 19, thereby realizing a seal therebetween. A part of the inner wall of the outlet valve core sleeve 15 is formed as an inclined surface, on which a rectangular groove is correspondingly provided. Furthermore, an annular space is formed between the outlet valve core 13 and the outlet valve core sleeve 15.

[0044] The outlet valve core 13 is correspondingly disposed in the gun sleeve 12, and the main valve core 28 is attached to the female gun base 34 and correspondingly disposed in the gun body 27. A third elastic member 23, preferably a compression spring, is provided between the outlet valve core 13 and the main valve core 28. A first concave step is provided on the right side of the outlet valve core 13, and a second concave step is provided on the left end of the main valve core 28. Thus, the left end of the third elastic member 23 is pressed against the first concave step of the outlet valve core 13, and its right side is pressed against the second concave step of the main valve core 28. In the first state, the solid umbrella member forms a seal by butting against the inclined surface in the outlet valve core sleeve 15 and strongly pressing the O-ring seal 20 under the action of the third elastic member 23, so that the first inclined through hole 131 and the second inclined through hole 132 do not communicate with each other, thereby ensuring that the female end unit 300 is in a self-sealing state. However, in the second state, the outlet valve core 13 is able to move inward along the axial direction to compress the third elastic member 23, so that the solid umbrella member disengages from the inclined surface in the outlet valve core sleeve 15. Thus, the first inclined through hole 131 and the second inclined through hole 132 communicate with each other via the annular space formed between the outlet valve core 13 and the outlet valve core sleeve 15.

[0045] According to the present invention, the main valve core 28 is mounted on the female gun base 34 via the main valve core base 33 fixedly mounted inside the female gun base 34. A third annular space 333 is formed between the main valve core base 33 and the female gun base 34, and communicates with the connecting end of the female gun base 34. The control mechanism can actuate the axial movement of the main valve core 28 so that the main valve core 28 communicates or does not communicate with the third annular space 333, thereby turning off or on the female filling and removing passages in the female end unit 300. The main valve core base 33 has a cylinder structure with a closed end. The main valve core base 33 has a circular bottom surface on its right side, into which the right end of the main valve core 28 is inserted. A plurality of inclined through holes 331 are provided at the closed end of the main valve core base 33, and a plurality of switching holes 332 are provided on the side wall of the main valve core base 33, evenly distributed along the circumferential direction. The inclined through hole 331 communicates with the switching hole 332 via a third annular space 333. The multiple third through holes 281 are evenly distributed along the circumferential direction on the side wall near the axial inner end of the main valve core 28. Two inner concave steps are arranged on both sides of the switching hole 332 on the side wall of the main valve core base 33. Two first accumulator seal rings 31, 32 are attached to the two inner concave steps to realize sealing between the main valve core 28 and the main valve core base 33. The main valve core 28 is configured so that the third through hole 281 can be offset in the axial direction from the switching hole 332 to turn the main valve core 28 off, or moved in the axial direction relative to the main valve core base 33 so that the third through hole 281 communicates with the corresponding switching hole 332 to turn the main valve core 28 on.

[0046] In one embodiment, the left side of the main valve core base 33 is provided with an external short thread, and the right side of the gun body 27 is provided with an internal short thread, and the main valve core base 33 is connected to the gun body 27 through the thread. The female gun base 34 has a cylindrical structure. The left side of the female gun base 34 is provided with an external thread, and the right side of the gun body 27 is provided with an internal thread, and the female gun base 34 is connected to the gun body 27 through the thread. The main valve core base 33 is disposed inside the female gun base 34. The left outer wall of the main valve core base 33 is provided with a trapezoidal groove, and the third seal member 30 is installed inside the trapezoidal groove. The third seal member 30 is preferably an O-shaped seal ring 30, which realizes the seal between the main valve core base 33 and the female gun base 34.

[0047] According to the present invention, the gun body 27 is provided with a third leak detection hole 39. Preferably, the third leak detection hole 39 is provided in the side wall of the gun body 27 near the rear end of the gun body 27. Specifically, the third leak detection hole 39 is provided at the left end of the internal thread on the right side of the gun body 27. Using a portable gas (hydrogen, etc.) detector, the sealing performance of the corresponding seal ring of the filling / removal joint 100a can be detected. Therefore, through the third leak detection hole 39, leakage of the seal ring can be detected in real time during filling / removal of high-pressure gas, and the third leak detection hole 39 can be used to monitor the presence or absence of a seal failure of the O-ring 30.

[0048] As shown in FIG. 2, an annular boss is provided near the center of the outer circumferential surface of the main valve core 28, and transmission teeth 282 are formed on the annular boss, which are distributed along the axial direction. The handle gear 29 is provided on the inner wall of the gun body 27 and meshes with the transmission teeth 282. By rotating the handle gear 29, the main valve core 28 can be moved and driven in the axial direction. A large arc-shaped groove is provided on the side wall of the gun body 27, and the handle gear 29 is attached to the large arc-shaped groove of the gun body 27. A handle 50 is provided on the outside of the gun body 27 (see FIG. 7) and is connected to the handle gear 29. The rotation of the handle gear 29 is controlled by the handle 50 at an angle of 0 to 180°. Specifically, when the rotation angle of the handle gear 29 is 0°, the control mechanism is in the zero position, that is, the handle gear 29 is in the first position. When the rotation angle of the handle gear 29 is 45°, the handle gear 29 is in the second position. When the rotation angle of the handle gear 29 is 180 degrees, the handle gear 29 is in the third position.

[0049] According to the present invention, as shown in FIG. 2, a bypass replacement pipe 40 is disposed in the gun body 27. One end of the bypass replacement pipe 40 communicates with the internal space of the gun body 27, and the other end is formed as a replacement gas valve port 35. The bypass replacement pipe 40 can open a replacement working channel and communicates with the replacement gas pipe 500 of the filling and extraction arm 100a, realizing the replacement of air inside the female end unit 300 before filling and extraction, and the replacement of high-pressure gas inside the female end unit 300 after filling and extraction. In this way, the replacement amount of high-pressure gas and the risk in the replacement of high-pressure gas can be greatly reduced. The gas replacement channel 40 is provided with a needle valve 36 for controlling the on / off state of the bypass replacement pipe 40. The replacement gas valve port 35 can be connected to an overhead discharge line or a nitrogen line by switching the valve of the filling and extraction column of the gas filling station.

[0050] In one embodiment, the gun body 27 has an asymmetric tubular structure. For example, the sidewall of the upper tubular part of the gun body 27 has a thickness greater than that of the lower tubular part. The replacement gas valve port 35 is provided in the upper part of the gun body 27 and has a left inclined tube inserted into the gun body 27. The end of the left inclined tube of the replacement gas valve port 35 reaches the mounting part of the right end of the outlet valve core sleeve 15. In the gun body 27, a rectangular groove is provided on the right side of the end of the left inclined tube of the replacement gas valve port 35. A second seal member 26, preferably an O-ring seal, is mounted in the rectangular groove to realize the seal between the main valve core 28 and the gun body 27.

[0051] According to one embodiment of the present invention, the gun body 27 is provided with a second leak detection hole 38. Preferably, the second leak detection hole 38 is provided in the lower tubular part in the middle of the gun body 27. A portable gas (e.g., hydrogen) detector can be used for leak detection of the corresponding seal of the filling / discharging joint 100a. The second leak detection hole 38 can be used for seal leak detection in real time during filling / discharging of high pressure gas, thereby detecting the sealing performance of the O-ring seal 26.

[0052] Preferably, a large arcuate groove for mounting the handle gear 29 is provided in the upper portion of the side wall of the gun body 27 so that the handle gear 29 is mounted therein.

[0053] According to the present invention, a fourth through hole 283 is provided in the side wall near the axially outer end of the main valve core 28. For example, a concave step is provided in the left inner wall of the main valve core 28, and a plurality of fourth through holes 283 are evenly distributed in the left concave step of the main valve core 28 along the circumferential direction. A concave step is provided in the right inner wall of the outlet valve core sleeve 15, and a second accumulator seal ring 24 is provided between the left outer wall of the main valve core 28 and the surface of the concave step at the right end of the outlet valve core sleeve 15, thereby realizing a seal between the main valve core 28 and the outlet valve core sleeve 15. The main valve core 28 is movable along the axial direction. Specifically, by rotating the handle gear 29 clockwise at an angle of 45°, the fourth through hole 283 is moved axially outward of the second accumulator seal ring 24, and the male pilot flow passage is closed. When the handle gear 29 is in the zero state (see FIG. 2), the fourth through hole 283 moves axially inward of the second accumulator seal ring 24, whereby the fourth through hole 283 connects with the bypass replacement line 40 and the male pilot flow passage is opened. In this manner, the male pilot flow passage can be opened and closed.

[0054] According to the present invention, as shown in FIG. 2, a grip sleeve assembly is provided at the front end of the gun sleeve 12. The grip sleeve assembly includes a grip sleeve 16, a jaw support sleeve 14, and a jaw 18. The grip sleeve assembly is configured such that the jaw 18 forms an axial limit for the grip sleeve 16, thereby forming a self-seal with the female end unit 300, and the jaw support sleeve 14 is axially pressed to limit the radial position of the jaw 18, so that the female end unit 300 can sealingly engage with or disengage from the male end unit 200. The grip sleeve 16, which is generally disposed outside the gun sleeve 12, has a tubular structure. A fourth elastic member 21, preferably a compression spring, is provided between the grip sleeve 16 and the gun sleeve 12. The inner wall of the grip sleeve 16 is provided with a first limit step with an end surface facing in the right direction, and the outer wall of the gun sleeve 12 is provided with a second limit step with an end surface facing in the left direction. Both ends of the fourth elastic member 21 abut against the first and second limiting steps, respectively. An arcuate groove is disposed around the periphery of the left side portion of the gun sleeve 12, and a grip sleeve retaining ring 17 for restricting the axial movement of the grip sleeve 16 is mounted in the arcuate groove.

[0055] As shown in FIG. 2, a plurality of mounting holes are evenly distributed along the circumferential direction in the sidewall area near the left end of the gun sleeve 12. The mounting holes extend through the sidewall of the gun sleeve 12, and the jaws 18 are respectively mounted in the mounting holes. The jaw support sleeve 14 provided between the gun sleeve 12 and the outlet valve core sleeve 15 has a tubular structure. An outer flange is provided on the right side of the jaw support sleeve 14. A fifth elastic member 22, preferably a compression spring, is provided between the jaw support sleeve 14 and the gun body 27 along the axial direction. Both ends of the fifth elastic member 22 abut against the right end of the outer flange and the left end face of the gun body 27, respectively. Meanwhile, a jaw groove 42 is provided on the outer wall of the male gun base 1 near its front end. Due to the action of the spring force of the fifth elastic member 22, the outer flange of the jaw support sleeve 14 is always strongly pressed against the inner step face in the middle of the left side of the gun sleeve 12. When the male end unit 200 and the female end unit 300 are separated from each other, the claw support sleeve 14 radially supports the claw 18 such that the arcuate surface of the radially outer end of the claw 18 fits tightly against the grip sleeve 16, thereby restricting the claw 18 to the grip sleeve 16.

[0056] In the first state, the jaw support sleeve 14 forms a support for the jaw 18 under the action of the fifth elastic member 22, so that the jaw 18 forms an axial limit for the gripping sleeve 16. At this time, under the action of the spring force of the fourth elastic member 21, the left inner inclined surface of the gripping sleeve 16 is pressed closely against the outer arcuate surface of the jaw 18, so that the jaw 18 limits the leftward movement distance of the gripping sleeve 16.

[0057] In the second state, the male gun base 1 pushes the jaw support sleeve 14 to move axially until the jaws drop into the corresponding jaw grooves 42, compressing the fifth elastic member 22, so that the male gun base 1 locks with the gun sleeve 12 to form a self-seal, thereby connecting the male end unit 200 to the female end unit 300. When the male end unit 200 and the female end unit 300 are connected to each other and the jaws 18 drop into the grooves 42 of the male gun base 1, the grip sleeve 16 continues to move leftward under the action of the fourth elastic member 21 until the left inner inclined surface of the grip sleeve 16 is pressed firmly against the outer arcuate surface of the grip sleeve retaining ring 17.

[0058] In this embodiment, the gripping sleeve 16 is configured to move axially by applying a force in the second state, and the jaws 18 are configured to automatically pop out of the jaw grooves 42 when the gripping sleeve moves until its inner wall surface is away from the mounting hole, so that the jaws 18 are reset and exert a restraining effect on the gripping sleeve 16 again, so that the male end unit 200 and the female end unit 300 form a self-seal. In this way, the jaws 18, the jaw support sleeve 14 and the gripping sleeve 16 cooperate to realize a quick and anti-loosening connection between the male end unit 200 and the female end unit 300 in the filling and dispensing fitting 100a.

[0059] According to one embodiment of the present invention, the female gun base 34, gun sleeve 12, outlet valve core 13, outlet valve core sleeve 15, main valve core 28, main valve core base 33, gun body 27, jaw support sleeve 14, grip sleeve 16, and other components of the female end unit 300 are all made of 316 stainless steel, which greatly helps to avoid hydrogen embrittlement.

[0060] Preferably, the O-ring seal of the present invention is made of UPE, which has good resistance to abrasion, impact, corrosion, hydrogen dissolution and swelling, pressing and high temperature. The first accumulator seal ring 31, 32 and the second accumulator seal ring 24 are made of 304 stainless steel on the inside and UPE on the outside, which has good resistance to hydrogen dissolution and swelling, abrasion, impact and corrosion. At the same time, the accumulator seal ring has self-compensating properties and meets the requirements of high-pressure dynamic seal.

[0061] As shown in FIG. 2, the male end unit 200 includes a male gun base 1 for connecting to a high pressure gas pipe bundle vehicle, a diverter valve 2 fixedly mounted in the male gun base 1, and a pilot valve 10 cooperating with the diverter valve 2. One end of the male gun base 1 (the left end in FIG. 2) is provided with an internal thread for connecting to the filling and unloading pipelines of the pipe bundle vehicle. When the male end unit 200 is connected to the female end unit 300, the axial end face of the pilot valve 10 fits closely to the axial end face of the valve core assembly in the female end unit 300. The pilot valve 10 is configured to form a male pilot flow path in the male end unit 200 when the handle gear 29 is in the second position, and to form a male filling and unloading flow path in the male end unit 200 when the handle gear 29 is in the third position.

[0062] In one embodiment, the diverter valve 2 has a cylindrical structure, with a hexagonal hole on the left side and a circular hole in the center on the right side, forming a stepped overflow channel inside the diverter valve 2. In addition, an annular lip extending radially inward is provided on the inner wall of the front end of the diverter valve 2, and a plurality of overflow holes 201 evenly distributed in the circumferential direction are provided on the annular lip. The overflow holes 201 extend through the annular lip along the axial direction. An external thread is provided on the outer peripheral surface of the diverter valve 2, and the diverter valve 2 is fixedly connected to the male gun base 1 through the external thread. In this specification, the "front end" refers to the end away from the high pressure gas pipe bundle when the male end unit 200 is connected to the high pressure gas pipe bundle vehicle.

[0063] In order to ensure the sealing performance of the connection between the diverter valve 2 and the male gun base 1, a rectangular groove is provided on the right outer ring of the diverter valve 2, and the seal member 3 is installed in this rectangular groove. Preferably, the seal member 3 is an O-ring seal. In one embodiment, the male gun base 1 is provided with a first leak detection hole 37. Preferably, the first leak detection hole 37 is provided on the side wall of the male gun base 1 at the right end of the internal thread. A portable gas detector can be used to detect leakage of the corresponding seal of the filling / removal fitting 100a. The first leak detection hole 37 can detect leakage of the seal member 3 in real time during filling / removal of high pressure gas, and the sealing performance of the O-ring seal 3 can be monitored.

[0064] According to the present invention, the pilot valve 10 is configured to be driven by a control mechanism to move axially relative to the diverter valve 2 to form a male pilot flow path or a male filling and removing flow path in the male end unit 200. As shown in FIG. 3, the pilot valve 10 is composed of a pilot valve seat 4 and a pilot valve core 101 adaptively mounted on the pilot valve seat 4, and a first annular space 105 communicating with the diverter valve 2 is formed between the pilot valve seat 4 and the male gun base 1, and a second annular space 106 is formed between the pilot valve core 101 and the male gun base 1. When the handle gear 29 is in the first position and the second position, the first annular space 105 and the second annular space 106 are blocked from each other, thereby closing the male filling and removing flow path. When the handle gear 29 is in the third position, the first annular space 105 communicates with the second annular space 106, thereby opening the male filling and removing flow path.

[0065] As shown in FIG. 2, the pilot valve seat 4 has a cylinder structure, its left side surface has a circular bottom surface, and a central hole is provided from the right side surface to the left side surface. The cylinder wall surface on the left side of the pilot valve seat 4 is tightly inserted into the circular hole on the right side of the diverter valve 2. Two rectangular grooves are provided on the right side of the inner wall surface of the pilot valve seat 4, and an O-ring seal 7 and an O-ring seal 8 are respectively installed in the two rectangular grooves. A plurality of second through holes are provided in the side wall of the pilot valve seat 4 between the two rectangular grooves, which are evenly arranged in the circumferential direction. A conical protrusion extending radially outward is provided on one end of the pilot valve seat 4 (the right end in FIG. 2), and the right end surface of the conical protrusion is configured as an inclined surface having an arc-shaped groove. An O-ring seal 9 is provided in the circular groove. The second elastic member 6 is arranged around the outer periphery of the pilot valve seat 4, and both ends of the second elastic member 6 are in contact with the conical protrusion and the annular lip, respectively. The conical projection abuts against an inclined surface formed on the inner wall of the male gun base 1 and is pressed firmly against it by the action of the second elastic member 6, thereby forming a seal. Preferably, the second elastic member 6 is a compression spring.

[0066] As shown in FIG. 2, the pilot valve core 101 is composed of a hollow tube inserted into the pilot valve seat 4 and a valve head connected to the hollow tube. The valve head is provided with an inner conical surface communicating with the hollow tube through a central through hole 102 extending along the axial direction. The inner conical surface is provided with a plurality of inclined holes 103 extending through the valve head and communicating with the second annular space. It should be understood that the inclined holes 103 extend from the inner conical surface to the left end face of the valve head, thereby forming a communication passage. The left hollow tube of the pilot valve 10 is inserted into the pilot valve seat 4. The hollow tube is provided with a plurality of first through holes evenly distributed in the circumferential direction. When the handle gear 29 is in the first position and the third position, the first through hole is offset from the second through hole to close the male pilot flow passage. When the handle gear 29 is in the second position, the first through hole communicates with the second through hole to open the male pilot flow passage. A first elastic member 5, preferably a compression spring, is provided between the pilot valve seat 4 and the pilot valve core 101. The left end of the first elastic member 5 is pressed against the left concave step surface of the pilot valve seat 4, and the right end of the first elastic member 5 is pressed against the arcuate surface of the left hollow tube of the pilot valve core 101.

[0067] In this embodiment, the outer periphery of the valve head of the pilot valve core 101 is provided with an outer annular step having an end face facing right, while the inner wall of the male gun base 1 is provided with an inner annular step having an end face facing left. Due to the spring force of the first elastic member 5, the outer annular step of the valve head of the pilot valve core 101 is always strongly pressed against the inner annular step inside the male gun base 1. Therefore, the inner annular step of the male gun base 1 can limit the distance that the pilot valve core 101 moves to the right.

[0068] According to the present invention, the filling and unloading fitting 100a has a first state in which the male end unit 200 and the female end unit 300 form their own self-seals, and a second state in which the male end unit 200 and the female end unit 300 are adapted to butt against each other. In the first state, the first through-hole of the pilot valve core 101 is offset from the second through-hole of the pilot valve seat 4, and thus the pilot valve 10 is turned off. In the second state, the pilot valve core 101 is pushed by the control mechanism to move leftward, compressing the first elastic member 5 so that the first through-hole communicates with the second through-hole. Thus, the diverter valve 2 can communicate with the overflow hole 201, the first annular space 105 formed between the pilot valve seat 4 and the male gun base 1, the second through-hole, the first through-hole, and the central through-hole 102 in the center of the valve head in sequence, forming a male pilot flow path in the male end unit 200. In the second state, the pilot valve core 101 continues to press the pilot valve seat 4 through the control mechanism to compress the second elastic member 6, so that the conical protrusion comes off the inclined surface of the inner wall of the male gun base, and as a result, the first annular space 105 communicates with the second annular space 106. In this way, the diverter valve 2 can communicate with the overflow hole 201, the first annular space 105, the second annular space 106 and the inclined hole 103, thereby forming a male filling and removing flow passage inside the male end unit 200. The elastic force of the second elastic member 6 is greater than the elastic force of the first elastic member 5. Therefore, when the pilot valve core 101 moves leftward along the axial direction, the male pilot flow passage and the male filling and removing flow passage can be opened sequentially.

[0069] In addition, a rectangular groove is provided on the inner wall near the right side surface of male gun base 1, and an O-ring seal 11 is attached to this rectangular groove to ensure sealing performance between male end unit 200 and female end unit 300 in the connected state.

[0070] In accordance with the present invention, the male gun base 1, diverter valve 2, pilot valve 10 and other components of the male end unit 200 are all made from 316 stainless steel, which greatly aids in avoiding hydrogen embrittlement.

[0071] According to the present invention, the filling and unloading joint 100a can realize the quick connection and disconnection between the high pressure gas pipe bundle vehicle and the high pressure gas filling pipeline. The cooperation of the jaw 18, the jaw support sleeve 14 and the grip sleeve 16 can realize the quick disengagement and anti-loosening connection between the male end unit 200 and the female end unit 300. In addition, the cooperation of the pilot valve seat 4 and the pilot valve core 101 allows the outlet valve core 13 to easily press and open the pilot valve seat 4 after the male end unit and the female end unit are connected to each other, thereby opening the high pressure gas flow path, so that the quick filling and unloading of the high pressure gas can be realized even when high pressure gas exists inside the male end unit 200. In addition, the filling and unloading joint 100a realizes the detachment and self-sealing of the diverter valve 2 of the male end unit 200 and the outlet valve core 13 of the female end unit 300 through the elastic member. The gas balance between the outlet valves of the male end unit 200 and the female end unit 300 can be realized through the pilot valve 10, and the male end unit 200 and the female end unit 300 can communicate under pressure. By rotating the handle, the male end unit 200 can be disconnected from the female end unit 300 under pressure. The filling and removal fitting 100a realizes the safe removal and replacement of high-pressure gas. The cooperation of the bypass replacement pipe 40 and the handle can realize the replacement of the air in the female end unit 300 before filling and removal, and the replacement of the high-pressure gas in the female end unit 300 after filling and removal, which can greatly reduce the amount of high-pressure gas replaced and the risk of replacement of high-pressure gas, effectively prevent leakage caused by accidental detachment of the fitting, ensure the safe filling and removal operation of the high-pressure gas pipe bundle vehicle, and greatly improve the reliability of the entire connection device in the filling and removal operation. Also, during filling and unloading of high pressure gas, the sealing performance of the ring seals and corresponding leakage can be monitored in real time through the first leak detection hole 37, the second leak detection hole 38, and the third leak detection hole 39, which can be realized by respective portable gas detectors for detecting the sealing performance of each of the ring seals in the filling and unloading joint 100a. Compared with the gas amount of the current long hose, the filling and unloading joint 100a significantly reduces the amount of unloaded high pressure gas and the risk of unloading.The operation procedure of the filling / unloading joint 100a according to the present invention is as follows.

[0072] First, when filling and extracting high-pressure gas, the male end unit 200 of the filling and extracting joint 100a is connected to a high-pressure gas pipe bundle vehicle, and its female end unit 300 is connected to the free end of the filling and extracting arm 100b arranged at a gas filling station. The filling and extracting arm 100b is connected to a high-pressure gas filling and extracting pole of the gas filling station.

[0073] Before connecting the male end unit 200 to the female end unit 300, it is necessary to make sure that the handle 50 of the female end unit 300 is rotated at an angle of 0°, the handle gear 29 is in the first position, and the handle gear 29 of the female end unit 300 is in the zero state. The operator holds the grip sleeve 16 of the female end unit 300 with both hands and aligns the gun sleeve 12 with the male gun base 1 of the male end unit 200. The female end unit 300 is pushed to the left as a whole, so that the right end surface of the male gun base 1 abuts against the left end surface of the jaw support sleeve 14. The male gun base 1 drives the jaw support sleeve 14 to move to the right, so that the fourth elastic member 21 is compressed. When the jaw groove 42 of the male gun base 1 is aligned with the radial inner end of the jaw 18, the outer arcuate surface of the jaw 18 receives a radial force from the left inner inclined surface of the grip sleeve 16, so that the jaw 18 instantly falls into the jaw groove 42 of the male gun base 1. The grip sleeve 16 then continues to move leftward until the left inner inclined surface of the grip sleeve 16 is pressed firmly against the outer arcuate surface of the grip sleeve retaining ring 17 by the action of the fourth elastic member 21, thus forming a restriction. FIG. 3 shows the male end unit 200 and the female end unit 300 of the filling-dispensing fitting 100a connected to each other. In this state, the pilot valve core 101 only moves slightly leftward, and the pilot valve 10 is not open. The outlet valve core 13 moves rightward relative to the main valve core 28. The third elastic member 23 is further compressed. The seal between the outlet valve core 13 and the male gun base 1 is realized by the O-ring seal 11.

[0074] Prior to filling and extracting high-pressure gas, it is necessary to replace the air in the outlet valve core 13 and the main valve core 28. By switching the valve of the filling and extraction column of the gas filling station, nitrogen at a pressure of 0.6 MPa can be flowed to the bypass replacement pipe 40 through the replacement gas pipe 500 of the filling and extraction arm 100b. That is, the bypass replacement pipe 40 of the female end unit 300 is connected to the nitrogen gas pipe of the filling and extraction column. First, the female replacement passage is opened by turning on the needle valve 36, and nitrogen at a pressure of 0.6 MPa is replenished to the outlet valve core 13 and the main valve core 28 through the female replacement passage. Then, the needle valve 36 is turned off. By switching the valve of the filling and extraction column, the bypass replacement pipe 40 is connected to the overhead discharge line of the filling and extraction column through the replacement gas pipe 500 of the filling and extraction arm 100b. Then, the needle valve 36 is turned on again, and the gas in the outlet valve core 13 and the main valve core 28 is discharged to the overhead discharge line of the filling-removal column through the female replacement flow passage and the replacement gas pipe 500 of the filling-removal arm 100b. The above operation is repeated at least twice to replenish nitrogen, thereby completely replacing the gas in the outlet valve core 13 and the main valve core 28 with nitrogen.

[0075] Next, the handle is rotated 45° clockwise, and the handle gear 29 is in the second position. The handle gear 29 drives the transmission gear 282 on the main valve core 28, and the main valve core 28 moves to the left. The main valve core 28 pushes the third elastic member 23 to the left, and the third elastic member 23 pushes the outlet valve core 13 to the left, and the outlet valve core 13 pushes the pilot valve 10 to the left. The first through hole provided in the hollow tube of the pilot valve 10 overlaps and aligns with the second through hole of the pilot valve seat 4, so that the replacement channel of the pilot valve 10 is opened, and the male pilot flow path in the male end unit 200 is opened. Figure 4 shows the state in which the pilot valve 10 of the filling and unloading joint 100a is opened. At this time, the high pressure gas in the high pressure gas pipe bundle vehicle enters the inside of the diverter valve 2 through the left hexagonal hole of the diverter valve 2, and enters the outlet valve core 13 and the main valve core 28 through the right circular hole of the diverter valve 2, the overflow hole 201, the first annular space 105, the second through hole of the pilot valve seat 4, the first through hole of the hollow tube of the pilot valve core 101, and the male pilot flow path formed by the central through hole 102 of the pilot valve core 101. At this time, the high pressure gas from the filling and extraction column connected to the female end unit 300 through the high pressure gas pipe 400 of the filling and extraction arm 100b remains sealed on the right side of the two first accumulator seal rings 31, 32.

[0076] Then, the handle is rotated 45° counterclockwise, so that the handle gear 29 returns to the first position and the handle 50 is again in the zero state. By switching the valve of the filling and extraction column, the replacement gas valve port 35 is connected to the overhead discharge line of the filling and extraction column through the replacement gas pipe 500 of the filling and extraction arm 100b. Then, the needle valve 36 is turned on to discharge the gas in the outlet valve core 13 and the main valve core 28. By repeating the above operations and refilling the high-pressure gas from the high-pressure gas pipe bundle vehicle twice, the replacement of the nitrogen in the outlet valve core 13 and the main valve core 28 with the high-pressure gas is completed.

[0077] Next, the needle valve 36 is turned off. As shown in FIG. 4, the handle is rotated 45° clockwise, so that the handle gear 29 is in the second position. The pilot valve 10 is turned on, and the male pilot flow path is opened. At this time, the high-pressure gas in the male end unit 200 passes through the male pilot flow path and enters the outlet valve core 13 and the main valve core 28 of the female end unit 300. Pressure balance is achieved in the gas phase space between the left and right sides of the pilot valve 10. Next, as shown in FIG. 5, the handle is continued to be rotated 180° clockwise to reach the third position. The handle gear 29 provided on the main valve core 28 is driven, and the main valve core 28 moves to the left. The main valve core 28 pushes the third elastic member 23 to the left, the third elastic member 23 pushes the outlet valve core 13 to the left, and the outlet valve core 13 pushes the pilot valve core 101 to the left. The left end face of the pilot valve core 101 hits the left bottom face inside the pilot valve seat 4, so the pilot valve core 101 drives the pilot valve seat 4 to move leftward. The O-ring seal 9 on the boss of the right outer annular face of the pilot valve seat 4 moves away from the inner inclined face of the male gun base 1. Then, the first annular space 105 communicates with the second annular space 106, and the external gas flow path space of the pilot valve seat 4 is opened, thereby opening the male filling and extraction flow paths. On the other hand, when the handle is rotated 180 degrees to move the main valve core 28 to the left at a predetermined position, the third through hole 281 on the right side of the main valve core 28 coincides with the switching hole 332 in the middle of the main valve core base 33, so that the gas phase space of the main valve core 28 communicates with the external space of the main valve core base 33, and the female filling and extraction flow paths are opened. In this way, the male filling and extraction passages communicate with the female filling and extraction passages, thereby opening the filling and extraction working channel in the filling and extraction fitting 100a. High pressure gas is filled along the following direction (the direction indicated by the left arrow in FIG. 5). The high pressure gas in the filling and extraction line of the filling and extraction column enters the inside of the female gun base 34 of the female end unit 300 through the high pressure gas pipe 400 of the filling and extraction arm 100b, passes from the inside of the female gun base 34 through the inclined through hole 331 provided in the right circular bottom surface of the main valve core base 33, and enters the third annular space 333 between the main valve core base 33 and the female gun base 34.Then, the high-pressure gas passes through the third through hole 281 and the switching hole 332 to enter the inside of the main valve core 28, passes through the second inclined through hole 132 on the right side of the solid umbrella member of the outlet valve core 13, the annular space between the outlet valve core 13 and the outlet valve core sleeve 15, and the first inclined through hole 131 in this order, and moves leftward to enter the inside of the outlet valve core 13. The high-pressure gas then passes leftward to enter the right inner conical space of the pilot valve core 101, passes through the inclined hole 103 provided in the valve head of the pilot valve 10, and enters the outer space of the pilot valve seat 4. Next, it passes through the overflow hole 201 provided on the right side of the diverter valve 2, enters the inner space of the diverter valve 2, and passes through the left hexagonal hole of the diverter valve 2 to enter the filling and withdrawal pipeline of the high-pressure gas pipe bundle vehicle. The high-pressure gas is withdrawn along the opposite direction to the flow direction of the filling gas (indicated by the rightward arrow in FIG. 5). FIG. 5 shows the inner channel of the filling and withdrawal joint 100a in an open state.

[0078] After the high-pressure gas filling and extraction work is completed, rotate the handle 180° counterclockwise and set the handle to the zero state. At this time, the high-pressure gas at the end of the high-pressure gas tube bundle vehicle is sealed again at the left side of the O-ring seal 9. The high-pressure gas from the filling and extraction column connected to the female end unit 300 through the high-pressure gas pipe line 400 of the filling and extraction arm 100b is sealed again at the right side of the two first accumulator seal rings 31, 32. By switching the valve of the filling and extraction column, the replacement gas valve port 35 is connected to the overhead discharge line of the filling and extraction column through the replacement gas pipe line 500 of the filling and extraction arm 100b. Then, the needle valve 36 is turned on, and the high-pressure gas in the outlet valve core 13 and the main valve core 28 is discharged through the female replacement flow path. The high-pressure gas flows as follows: The high pressure gas passes through the fourth through hole 283 of the left concave step of the main valve core 28 from the internal space of the outlet valve core 13 and the main valve core 28, and enters the slit between the main valve core 28 and the end of the left inclined pipe of the replacement gas valve pipe 35. The high pressure gas then enters the left inclined pipe of the replacement gas valve pipe 35 and the horizontal pipe of the bypass replacement pipe 40, passes through the needle valve 36, enters the replacement gas pipe 500 of the filling-extraction arm 100b, and enters the filling-extraction pipe of the filling-extraction column. Figure 6 shows the replacement gas valve port 35 and the needle valve 36 of the filling-extraction joint 100a in an open state.

[0079] When the gas in the outlet valve core 13 and the main valve core 28 is discharged and reaches atmospheric pressure, the needle valve 36 is turned off. By switching the valve of the filling and removal column, the replacement gas valve port 35 is connected to the nitrogen line of the filling and removal column through the replacement gas line 500 of the filling and removal arm 100b. The needle valve 36 is turned on again, and nitrogen under a pressure of 0.6 MPa is replenished to the outlet valve core 13 and the main valve core 28 through the female replacement flow path. Next, the needle valve 36 is turned off, and the valve of the filling and removal column is switched, and the replacement gas valve port 35 is connected to the overhead discharge line of the filling and removal column through the replacement gas line 500 of the filling and removal arm 100b. After that, the needle valve 36 is turned on again, and the gas in the outlet valve core 13 and the main valve core 28 is discharged through the female replacement flow path. By repeating the above operations and replenishing nitrogen twice, the replacement of the gas in the outlet valve core 13 and the main valve core 28 with nitrogen is completed.

[0080] After the gas replacement is completed, the operator grips the grip sleeve 16 with both hands and moves it to the left. When the left inner inclined surface of the grip sleeve 16 is located directly above the jaw 18, the spring force of the fifth elastic member 22 acts on the right end surface of the jaw support sleeve 14, and the jaw support sleeve 14 is pushed and moves to the left. The jaw support sleeve 14 applies a leftward axial force to the male gun base 1, and the inclined surface of the jaw groove 42 of the male gun base 1 applies an outward axial force to the jaw 18. Therefore, the jaw 18 instantly jumps up, and the inner bottom surface of the jaw 18 is supported by the outer wall surface of the jaw support sleeve 14. Meanwhile, the outer arcuate surface of the jaw 18 is strongly pressed against the left inner inclined surface of the grip sleeve 16. The movement of the grip sleeve 16 to the left is restricted by the jaw 18. After the male gun base 1 is released from the gun sleeve 12, the outer arcuate surface of the solid umbrella member of the outlet valve core 13 comes into close contact with the O-ring seal 20 to achieve sealing. Thus, the male end unit 200 can be detached from the female end unit 300 .

[0081] The directions of the arrows in Figures 4 and 5 indicate the directions of gas flow.

[0082] 8 and 9 show the structure of the double channel rotary joint 600. As shown in FIG. 8 and FIG. 9, the double channel rotary joint 600 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 is provided with a central blind hole 6011 extending along the axial direction and a replacement gas flow hole 6012. The first end (the left end in FIG. 8) of the replacement gas flow hole 6012 is formed as a first replacement gas port 602. The valve core sleeve 604 is disposed around the rotary valve core 601 and is rotatable relative to the rotary valve core 601. The side wall of the valve core sleeve 604 is provided with a second replacement gas port 607, which is in continuous communication with the second end (the right end in FIG. 1) of the replacement gas flow hole 6012. The valve core seat 612 is fixedly connected to the valve core sleeve 604, and the inside of the valve core seat 612 is provided with a plurality of axial through holes 6121 evenly distributed in the circumferential direction. Meanwhile, the rotary valve core 601 is provided with a plurality of radial through holes 6013 evenly distributed in the circumferential direction, and both ends of the radial through holes 6013 are respectively communicated with the central blind hole 6011 and the axial through hole 6121. The valve head 614 is fixedly connected to the valve core sleeve 604, and the internal cavity of the valve head 614 is communicated with the axial through hole 6121. The first replacement gas port 602, the replacement gas flow hole 6012, and the second replacement gas port 607 are sequentially communicated to form a replacement gas flow path 600a. The central blind hole 6011, the radial through hole 6013, the axial through hole 6121, and the internal cavity of the valve head 614 are sequentially communicated to form a high-pressure gas flow path 600b.

[0083] 8, a first end of the rotary valve core 601 is provided with a disk-shaped base 6014. The replacement gas flow hole 6012 includes a first duct and a second duct communicating with the first duct, the first duct extending along the radial direction of the disk-shaped base 6014, and the second duct extending along the axial direction of the rotary valve core 601. The first replacement gas port 602 is formed at the end of the first duct.

[0084] In this embodiment, as shown in Fig. 9, the disk-shaped base 6014 is provided with a plurality of screw mounting holes 6016 evenly distributed along the circumferential direction for mounting fasteners. In this manner, the disk-shaped base 6014 has a flange connection structure for connection to other pipelines such as a high-pressure gas pipeline (described later). In addition, in order to ensure sealing between the disk-shaped base 6014 and other pipelines, a seal groove may be provided on the end face of the disk-shaped base 6014 at a position radially outward of the central blind hole 6011, and a seal member may be installed in this seal groove.

[0085] According to an embodiment of the present invention, an annular groove is provided on the inner wall surface of the valve core sleeve 604 at a position radially inside the second replacement gas port 607. A communication opening is provided at the bottom of the second replacement gas port 607, which extends through the side wall of the valve core sleeve 604. The second replacement gas port 607 communicates with the annular groove through the communication opening, and the end of the second duct communicates with the annular groove. Therefore, the second replacement gas port 607 communicates with the replacement gas flow hole 6012. When the valve core sleeve 604 rotates relative to the rotary valve core 601, the second replacement gas port 607 always remains in communication with the replacement gas flow hole 6012 through the annular groove.

[0086] As shown in FIG. 8, the inner wall of the valve core sleeve 604 is provided with first seal grooves spaced apart from each other, which are respectively disposed on both axial sides of the annular groove. A first seal member 605 is attached to each first seal groove. Preferably, the first seal groove is a trapezoidal groove, and the first seal member is an O-ring seal. At least two first seal grooves may be provided. After the valve core sleeve 604 and the rotary valve core 601 are assembled, each O-ring seal 605 is pressed to form a seal, thereby ensuring the sealing performance of the replacement gas flow hole 6012, and the replacement gas can only flow through the replacement gas flow hole 6012 between the first replacement gas port 602 and the second replacement gas port 607 and the gas phase space formed in the annular groove, thereby avoiding leakage and diffusion of the replacement gas.

[0087] According to the present invention, the outer wall of the rotary valve core 601 is provided with a first outer step with an end face facing the second end, and the inner wall of the valve core sleeve 604 is provided with a first inner step with an end face facing the first end. A bearing 603 is provided between the first outer step and the first inner step. The valve core sleeve 604 has a cylindrical structure and is disposed around the outer circumferential surface of the rotary valve core 601 as a whole. A rotational connection is formed between the first end of the valve core sleeve 604 and the rotary valve core 601 via the bearing 603, so that smooth rotation between the valve core sleeve 604 and the rotary valve core 601 is realized.

[0088] As shown in FIG. 8, the second end of the rotary valve core 601 is provided with a protrusion 6015 extending in the axial direction. Meanwhile, a hollow cavity is formed in the middle of the valve core seat 612, and a plurality of axial through holes 6121 of the valve core seat 612 are provided on the radial outside of the hollow cavity. A plane bearing 613 is installed in the hollow cavity, and the protrusion 6015 at the end of the rotary valve core 601 is inserted into the hollow cavity after penetrating the plane bearing 613. The outer ring of the plane bearing 613 is fixedly connected to the inner wall of the hollow cavity, and the inner ring is fixedly connected to the protrusion 6015, so that a rotational connection is formed between the rotary valve core 601 and the valve core seat 612 via the plane bearing 613. Therefore, a smoother rotation between the valve core seat 612 and the rotary valve core 601 is realized.

[0089] According to an embodiment of the present invention, the valve core seat 612 and the valve core sleeve 604 are assembled as a mutually embedded structure and fastened by a fastener 611. The fastener 611 is preferably a fastening bolt. An annular slot extending axially inward is provided at the second end of the valve core sleeve 604, and a tubular connection extending axially outward is provided at the first end of the valve core seat 612, and the tubular connection is engageably mounted in the annular slot. A second seal groove is provided on the inner wall of the tubular connection, and a second seal member 610 is mounted in the second seal groove. Preferably, the second seal groove is a trapezoidal groove, and the second seal member is an O-ring seal. The valve core sleeve 604 and the valve core seat 612 form a fixed connection through the fastener 611, which fits into the annular slot passing through the tubular connection to firmly press the second seal member 610, thereby forming a seal between the valve core sleeve 604 and the valve core seat 612.

[0090] 8, a slot passage is formed between the axial end face of the valve core sleeve 604 and the valve core seat 612. The radial through hole 6013 of the rotary valve core 601 communicates with the axial through hole 6121 of the valve core seat 612 via the slot passage. In this way, a high-pressure gas flow passage 600b is formed in the double channel rotary joint 600, which is composed of the central blind hole 6011, the radial through hole 6013, the slot passage, the axial through hole 6121, and the internal cavity of the valve head 614, which are sequentially communicated with each other.

[0091] In one embodiment, the second inner step is also provided on the inner wall of the valve core sleeve 604 with an end face toward the second end, and the third inner step is provided on the inner wall of the valve core seat 612 with an end face toward the first end. After the dual channel rotary joint 600 is assembled, a first annular groove and a second annular groove are respectively formed between the rotary valve core 601 and the second inner step, and between the rotary valve core 601 and the third inner step. The first annular groove and the second annular groove are respectively disposed on both axial sides of the radial through hole 6013, and a third accumulator seal ring 608 is respectively mounted inside the first annular groove and the second annular groove. Therefore, the seal between the rotary valve core 601 and the valve core sleeve 604 and the seal between the rotary valve core 601 and the valve core seat 612 are realized through the corresponding third accumulator seal ring 608, thereby ensuring the sealing performance of the high pressure gas flow path 600b in the dual channel rotary joint 600. Preferably, the third accumulator seal ring 608 may be made from ultra-high molecular weight polyethylene and is self-lubricating.

[0092] Therefore, the rotary valve core 601 is rotatably connected to the valve core sleeve 604 under the action of the bearing 603, the protrusion 6015 and the plane bearing 613. The radial through-hole 6013 maintains communication with the axial through-hole 6121 of the valve core seat 612 through the channel between the third accumulator seal ring 608. Therefore, the rotary valve core 601 having the above structure can rotate smoothly relative to the valve core sleeve 604 when there is high pressure gas in the dual channel high pressure gas rotary joint 600, and the dual channel high pressure gas rotary joint 600 can rotate under pressure.

[0093] According to the present invention, as shown in FIG. 8, the valve head 614 includes a conical body and a tubular weld connected to the second end of the conical body. The inner diameter of the conical body is configured to decrease from its first end to its second end, thereby forming a conical cavity inside the valve head 614. The first end of the valve head 614 is provided with a stepped connection, which has an external thread. Meanwhile, the inner wall of the second end of the valve core seat 612 is provided with an internal thread, and the valve head 614 and the valve core seat 612 are fixedly connected to each other so as to be engageable with each other through the thread. The valve head 614 is welded to a high pressure gas pipeline through the tubular weld.

[0094] According to the present invention, as shown in Fig. 1 and Fig. 10, the loading and unloading arm 100b includes a dual channel rotary joint 600, a high pressure gas line 400, a replacement gas line 500, and a fixed column 70. The high pressure gas line 400 includes a plurality of high pressure gas sub-lines 401, 402, 403, 404, 405, 406, 407, which are connected in sequence. Adjacent high pressure gas sub-lines are rotatably connected to each other via one of the dual channel rotary joints 600, and these high pressure gas sub-lines communicate with a high pressure gas flow path 600b in said one of the dual channel rotary joints 600. The replacement gas line 500 includes a plurality of replacement gas sub-lines 51, 52, 53, 54, 55, 56, and 57, each of which communicates with a replacement gas flow path 600a in a corresponding dual channel rotary joint 600. The fixed column 70 is fixed to the high pressure gas filling / unloading site by a foot bolt, and a first end of the high pressure gas pipeline 400 is connected to the fixed column 70 via a support frame. The support frame includes an upper fixed plate and a lower fixed plate fixed at a distance on the fixed column 70. A first end of the high pressure gas pipeline 400 is formed as a high pressure gas port 73, and a first end of the replacement gas pipeline 500 is formed as a replacement gas port 72. The high pressure gas pipeline 400 is rotatable under pressure via the double channel rotary joint 600, so that the filling / unloading arm 100b is extendable and rotatable, and its free end is movable in three dimensions. The high pressure gas pipeline 400 may be a rigid pipe. One end of the high pressure gas sub-pipe is formed as a flange, and the high pressure gas sub-pipe is engagably connected to the disk-shaped base 6014 of the first end of the double channel rotary joint 600 via the flange, thereby forming a fixed connection. The other end of the sub-high pressure gas line is fixedly connected to a tubular weld in the valve head 614 by welding.

[0095] The loading / unloading arm 100b further includes a spring-loaded balancer 75 for maintaining the posture of the high pressure gas pipeline 400 and the dual channel rotary joint 600. As shown in Fig. 1, one end of the spring-loaded balancer 75 is attached to the corresponding valve core sleeve 604 via a clamp, and the other end is attached to the corresponding high pressure gas pipeline.

[0096] As shown in Fig. 1 and Fig. 10, the high pressure gas pipeline 400 includes a first high pressure gas sub-pipe 401, a second high pressure gas sub-pipe 402, a third high pressure gas sub-pipe 403, a fourth high pressure gas sub-pipe 404, a fifth high pressure gas sub-pipe 405, a sixth high pressure gas sub-pipe 406 and a seventh high pressure gas sub-pipe 407 connected in sequence. Each high pressure gas sub-pipe is connected to a high pressure gas flow path 600b in a corresponding double channel rotary joint 600, thereby forming a high pressure gas flow path. Two adjacent pipelines are connected to each other via the double channel rotary joint 600. Thus, each double channel rotary joint 600 is formed as a universal double channel rotary joint, and is also formed as a corresponding joint of the loading and unloading arm 100b. The replacement gas pipeline 500 includes a first replacement gas sub-pipe 51, a second replacement gas sub-pipe 52, a third replacement gas sub-pipe 53, a fourth replacement gas sub-pipe 54, a fifth replacement gas sub-pipe 55, a sixth replacement gas sub-pipe 56, and a seventh replacement gas sub-pipe 57, which are connected in series. Each replacement gas sub-pipe is connected to a replacement gas flow path 600a of a corresponding double channel rotary joint 600, thereby forming a replacement gas flow path. In this way, the filling and unloading arm 100b is formed as a double channel filling and unloading arm, which allows for quick connection between the long tube trailer and the filling and unloading pipeline, and allows for gas replacement before and after filling and unloading of high pressure gas, and for filling and unloading of high pressure gas.

[0097] As shown in FIG. 1, the first high pressure gas sub-pipe 401 is connected to the second high pressure gas sub-pipe 402 via the first universal double channel rotary joint 6001. The first high pressure gas sub-pipe 401 is a straight pipe and is connected to the lower fixed plate through its central hole. The lower end of the first high pressure gas sub-pipe 401 is formed as a high pressure gas port 3 for connecting to the high pressure gas pipe of the filling and withdrawal pipe. The upper end of the first high pressure gas sub-pipe 401 is connected to the valve head 614 of the first universal double channel rotary joint 6001 by welding. Meanwhile, the upper end of the first replacement gas sub-pipe 51 is connected to the second replacement gas port 607 of the first universal double channel rotary joint 6001 by a screw, and the lower end of the first replacement gas sub-pipe 51 is provided with a replacement gas port 2 for connecting to the replacement pipe in the filling and withdrawal pipe.

[0098] As shown in FIG. 1, the second high pressure gas sub-pipe 402 is a Z-shaped pipe, and is fixedly connected to the disk-shaped base 6014 of the first universal double channel rotary joint 6001 through its lower end flange. A fixed pipe is provided at the top of the vertical end of the second high pressure gas sub-pipe 402, and a damping bearing 71 is provided on the upper fixed plate attached to the fixed column 1. The fixed pipe at the top of the vertical end of the second high pressure gas sub-pipe 402 is inserted into the damping bearing 71, and the second high pressure gas sub-pipe 402 can rotate horizontally around the Z-shaped vertical pipe as an axis. In one embodiment, a tilt bracket 72 is provided in the middle of the second high pressure gas sub-pipe 402 to support the second high pressure gas sub-pipe 402. The second replacement gas sub-pipe 52 is fixed along the tilt bracket 72.

[0099] As shown in Figures 1 and 10, the second high pressure gas sub-pipe 402 is connected to the third high pressure gas sub-pipe 403 via a second universal double channel rotary joint 6002, and the upper end of the second high pressure gas sub-pipe 402 is welded to the valve head 614 of the second universal double channel rotary joint 6002. The third high pressure gas sub-pipe 403 is a pipe bent at a right angle, and the lower end is fixedly connected to the disk-shaped base 6014 of the second universal double channel rotary joint 6002 via a flange. Meanwhile, the lower end of the second replacement gas sub-pipe 52 is connected to the first replacement gas port 602 of the first universal double channel rotary joint 6001 via a screw, and the upper end of the second replacement gas sub-pipe 52 is connected to the second replacement gas port 607 of the second universal double channel rotary joint 6002 via a screw.

[0100] 10, the third high pressure gas sub-pipe 403 is connected to the fourth high pressure gas sub-pipe 404 via a third universal double channel rotary joint 6003, and the upper end of the third high pressure gas sub-pipe 403 is welded to the valve head 614 of the third universal double channel rotary joint 6003. The fourth high pressure gas sub-pipe 404 is a special Z-shaped pipe, and its horizontal left end is fixedly connected to the disk-shaped base 6014 of the third universal double channel rotary joint 6003 via a flange. In order to maintain the posture of the right pipe of the fourth high pressure gas sub-pipe 404 and the third universal double channel rotary joint 6003, one end of the spring-loaded balancer 10 is attached to the third universal double channel rotary joint 6003 via a clamp, and the other end is attached to the fourth high pressure gas sub-pipe 404. Meanwhile, one end of the third replacement gas sub-pipe 53 is connected to the first replacement gas port 602 of the second universal double channel rotary joint 6002 by a screw, and the other end is connected to the second replacement gas port 607 of the third universal double channel rotary joint 6003 by a screw.

[0101] The fourth high pressure gas sub-pipe 404 is connected to the fifth high pressure gas sub-pipe 405 via a fourth universal double channel rotary joint 6004. The right vertical end of the fourth high pressure gas sub-pipe 404 is welded to the valve head 614 of the fourth universal double channel rotary joint 6004. The fifth high pressure gas sub-pipe 405 is a pipe bent at a right angle, and its lower end is fixedly connected to the disk-shaped base 6014 of the fourth universal double channel rotary joint 6004 via a flange. One end of the fourth replacement gas sub-pipe 54 is connected to the first replacement gas port 602 of the third universal double channel rotary joint 6003 via a screw, and the other end is connected to the second replacement gas port 607 of the fourth universal double channel rotary joint 6004 via a screw.

[0102] As shown in Figures 10 and 11, the fifth high pressure gas sub-pipe 405 is connected to the sixth high pressure gas sub-pipe 406 via the fifth universal double channel rotary joint 6005, and the upper end is welded to the valve head 614 of the fifth universal double channel rotary joint 6005. The sixth high pressure gas sub-pipe 406 is a pipe bent at a right angle, and the left end is fixedly connected to the disk-shaped base 6014 of the fifth universal double channel rotary joint 6005 via a flange. One end of the fifth replacement gas sub-pipe 55 is connected to the first replacement gas port 602 of the fourth universal double channel rotary joint 6004 through a screw, and the other end is connected to the second replacement gas port 607 of the fifth universal double channel rotary joint 6005 through a screw.

[0103] As shown in FIG. 11, the sixth high pressure gas sub-pipe 406 is connected to the seventh high pressure gas sub-pipe 407 via the sixth universal double channel rotary joint 6006. The seventh high pressure gas sub-pipe 407 is a straight pipe, the left end of which is fixedly connected to the disk-shaped base 6014 of the sixth universal double channel rotary joint 6006 via a flange, and the right end of which is connected to the female end unit 300 of the charging-withdrawing joint 100a via a screw. The upper right end of the sixth high pressure gas sub-pipe 406 is welded to the valve head 614 of the sixth universal double channel rotary joint 6006. In this way, each high pressure gas sub-pipe is in communication with the high pressure gas flow path 600b in the corresponding universal double channel rotary joint. One end of the sixth replacement gas sub-pipe 56 is connected to the first replacement gas port 602 of the fifth universal double channel rotary joint 6005 via a screw, and the other end is connected to the second replacement gas port 607 of the sixth universal double channel rotary joint 6006 via a screw. Meanwhile, one end of the seventh replacement gas sub-pipe 57 is connected to the first replacement gas port 602 of the sixth universal double channel rotary joint 6006 via a screw, and the other end is connected to the replacement gas valve port 35 of the charging / removing joint 100a via a screw.

[0104] The double channel rotary joint 600 used in the high pressure gas filling and unloading system 100 according to the present invention includes a high pressure gas flow path 600b and a replacement gas flow path 600a. Due to the multiple seal structures of the high pressure gas filling and unloading system 100, even when high pressure gas is present, the rotary valve core 601 can rotate smoothly between the valve core sleeve 604 and the valve core seat 612, effectively ensuring the safe discharge of replacement gas before and after filling and unloading of high pressure gas, and the safety of the pipeline during filling and unloading of high pressure gas. By combining the high pressure gas pipeline 400, the replacement gas pipeline 500 and the multiple double channel rotary joints 600, the high pressure gas filling and unloading arm 100b according to the present invention forms a high pressure gas flow pipeline and a replacement gas flow path, realizes a hard pipeline connection between the filling and unloading pipeline and the high pressure gas pipeline vehicle, and ensures the safety of filling and unloading of high pressure gas. By cooperation of the high pressure gas filling / removal arm 100b and the filling / removal joint 100a, the high pressure gas filling / removal system 100 according to the present invention can realize replacement of air in the female end unit 300 before filling / removing high pressure gas and replacement of high pressure gas in the female end unit 300 after filling / removal by rotating the handle 50 of the filling / removal joint 100a. The replacement gas is discharged overhead through the replacement gas pipe 500 of the high pressure gas filling / removal arm 100b, greatly reducing the amount of replacement of high pressure gas and the risk.

[0105] It should be understood that in the present invention, the terms "first" and "second" are used for illustrative purposes only and are not intended to suggest or imply relative importance or to implicitly specify the number of technical features. Thus, a technical feature defined by the term "first" or "second" may include, explicitly or implicitly, one or more of such technical features. In the description of the present invention, "multiple" means two or more unless otherwise specified. It should also be noted that in the present specification, directional terms or assertions such as "upper", "lower", "left", and "right" are all oriented to the corresponding drawings and are used only for illustrative purposes and simplified description of the present invention, and are not intended to limit the absolute positions of related components, which may be changed according to specific circumstances.

[0106] Finally, it should be noted that the above description is merely illustrative of the preferred embodiments of the present invention, and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions defined in the above embodiments or replace some of the technical features with equivalents. Modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention are intended to be included in the protection scope of the present invention.

Claims

1. A high pressure gas line (400) for connection to a gas filling station; A replacement gas line (500) for gas replacement; A plurality of double channel rotary joints (600) provided in the high pressure gas pipeline and configured to be rotatable under pressure; and a filling and unloading joint (100a) provided at a free end of the high pressure gas line and having a control mechanism, the filling and unloading joint (100a) being configured to form a replacement working channel or a filling and unloading working channel within the filling and unloading joint via the control mechanism; The control mechanism is configured to alternatively open the replacement working channel and the filling / removal working channel so that the replacement working channel communicates with the replacement gas line (500) for gas replacement, or the filling / removal working channel communicates with the high-pressure gas line (400) for filling / removing high-pressure gas.

2. The high pressure gas has a pressure in the range of 10 to 50 MPa, 2. The high pressure gas filling and unloading system according to claim 1, wherein the high pressure gas is preferably hydrogen, CNG or helium.

3. The filling and unloading joint further comprises a male end unit (200) for connection to a high pressure gas transport vehicle or a gas fuel system, and a female end unit (300) for fixed connection to the high pressure gas pipeline (400); 3. The high pressure gas filling and removal system according to claim 1 or 2, wherein the control mechanism is located in the female end unit.

4. The female end unit comprises a female housing, a valve core assembly within the female housing, and a bypass replacement line (40) formed within the female housing; an internal cavity of the female end unit capable of communicating with the bypass replacement line to define a female replacement flow passage; 4. The high pressure gas filling and removal system of claim 3, wherein the valve core assembly is configured to be driven by the control mechanism to move axially relative to the female housing, thereby closing off the female displacement passage and forming a female filling and removal passage within the female end unit.

5. 5. The high pressure gas filling and removal system according to claim 4, wherein the control mechanism drives the valve core assembly to move axially, whereby the male pilot passage and the female replacement passage in the male end unit are alternatively connected to the internal cavity of the female end unit for gas replacement, and the female filling and removal passage is connected to the male filling and removal passage in the male end unit for filling and removing high pressure gas, thereby opening the filling and removal operation passage.

6. The control mechanism includes: A handle gear (29) provided on the female housing; a transmission gear (282) meshing with the handle gear, the transmission gear being formed on an outer peripheral surface of the valve core assembly, and driving the valve core assembly to move axially relative to the female housing by rotating the handle gear; The handle gear is By alternatively rotating the handle gear between a first position and a second position, the female replacement flow passage is alternatively opened and closed, thereby enabling gas replacement through the female replacement flow passage; 6. The high pressure gas filling and unloading system of claim 5, having three control positions, such that when the handle gear is in a third position, the filling and unloading working channel is opened for the filling and unloading of high pressure gas.

7. the female housing includes a female gun base (34) having a connecting end, and a gun body (27) and a gun sleeve (12) fixed in order to a front end of the female gun base; 7. The high pressure gas filling and removal system of claim 6, wherein the bypass replacement line (40) is disposed within the gun body.

8. the valve core assembly includes an outlet valve core (13) and a main valve core (28); The outlet valve core (13) is installed in the gun sleeve (12) via an outlet valve core sleeve (15); 8. The high pressure gas filling and removal system according to claim 7, wherein the main valve core is installed on the female gun base via a main valve core base (33) and is actuated by the handle gear.

9. The outlet valve core comprises: A hollow tube body; a solid umbrella member provided at one end of the hollow tube body, the solid umbrella member having a first inclined through hole (131) and a second inclined through hole (132) provided on both axial sides of the solid umbrella member, The first inclined through hole and the second inclined through hole are or The high pressure gas filling and removal system of claim 8 , configured to connect the outlet valve core and the main valve core in communication with each other.

10. A third elastic member (23) is provided between the outlet valve core and the main valve core, 10. The high pressure gas filling and removal system of claim 9, wherein the solid umbrella member is configured to abut and form a seal against an inclined surface formed in the outlet valve core sleeve (15) by the action of the third elastic member, or disengage from the inclined surface, so that the first inclined through hole and the second inclined through hole are sealed with each other or communicate with each other.

11. a third annular space (333) is formed between the main valve core base (33) and the female gun base (34) and communicates with the connection end of the female gun base; 9. The high pressure gas filling and withdrawal system according to claim 8, wherein when the handle gear is in the third position, the main valve core communicates with the third annular space, thereby opening the female filling and withdrawal passage.

12. The main valve core base (33) has a cylindrical structure having a closed end with an inclined through hole (331) communicating with the connecting end of the female gun base; A switching hole (332) is provided in the side wall of the main valve core base, The high pressure gas filling and unloading system according to claim 11, wherein the inclined through hole (331) communicates with the switching hole (332) through the third annular space (333).

13. Third through holes (281) are distributed in the side wall of the main valve core (28); 13. The high pressure gas filling and removal system of claim 12, wherein the third through hole is configured to be offset from or aligned with the switching hole (332) by axial movement of the main valve core relative to the female housing, thereby closing or opening the female filling and removal flow passage.

14. A fourth through hole (283) is further provided in the side wall of the main valve core (28), a second accumulator seal ring (24) between the main valve core and the outlet valve core sleeve; 14. The high-pressure gas filling and removal system according to claim 13, wherein the fourth through hole is positioned axially inside the second accumulator seal ring to open the female replacement passage, or is positioned axially outside the second accumulator seal ring to close the female replacement passage, depending on the axial movement of the main valve core.

15. The male end unit (200) comprises: Male goose base (1) and a diverter valve (2) fixedly mounted within the male gun base (1); a pilot valve (10) in adaptive cooperation with the diverter valve; an axial end face of the pilot valve closely fits an axial end face of the valve core assembly when the male end unit is connected to the female end unit; The pilot valve is forming the male pilot passage within the male end unit when the handle gear is in the second position; 15. The high pressure gas filling and removal system of claim 6, configured to define the male filling and removal passage within the male end unit when the handle gear is in the third position.

16. the pilot valve includes a pilot valve seat (4) and a pilot valve core (101) adaptively cooperating with the pilot valve seat; a first annular space (105) in communication with the diverter valve is formed between the pilot valve seat and the male gun base; A second annular space (106) is formed between the pilot valve core and the male gun base; when the handle gear is in the first position and the second position, the first annular space and the second annular space are sealed off from each other, thereby closing the male fill-remove passage; 16. The high pressure gas filling and removal system according to claim 15, wherein when the handle gear is in the third position, the first annular space communicates with the second annular space, thereby opening the male filling and removal passage.

17. The pilot valve core includes a hollow tube inserted into the pilot valve seat and a valve head connected to one end of the hollow tube. The valve head comprises a central through hole (102) communicating with the hollow tube and a plurality of angled holes (103) extending through the valve head and evenly distributed around the circumference; 17. The high pressure gas filling and removal system of claim 16, wherein the angled hole communicates with the second annular space.

18. The hollow tube has a plurality of first through holes evenly distributed in a circumferential direction; The pilot valve seat has a plurality of second through holes evenly distributed in a circumferential direction, when the handle gear is in the first position and the third position, the first through hole is offset from the second through hole to close a male pilot flow passage; 18. The high pressure gas filling and removal system according to claim 17, wherein when the handle gear is in the second position, the first through-hole communicates with the second through-hole to open a male pilot passage.

19. a grip sleeve assembly is provided at a forward end of the gun sleeve (12) and includes a grip sleeve (16) disposed on an exterior side of the gun sleeve, a chin support sleeve (14) disposed on an interior side of the gun sleeve, and a jaw (18) extending through the gun sleeve; The grip sleeve assembly includes: The jaws are configured to form an axial restriction against the grip sleeve, thereby forming a self-seal with the female end unit.

20. The high pressure gas filling and removal system of claim 18, configured such that the radial position of the jaws is limited by axially pushing the jaw support sleeve, thereby connecting and sealing the female end unit to or disconnecting the male end unit from the male end unit.

20. 2. The high pressure gas filling and unloading system of claim 1, wherein a replacement gas flow path (600a) communicating with the replacement gas line and a high pressure gas flow path (600b) communicating with the high pressure gas line are provided within the dual channel rotary joint (600).

21. The double channel rotary joint comprises: A rotary valve core (601) having a central blind hole (6011) and a replacement gas flow hole (6012) extending along an axial direction. a valve core sleeve (604) disposed about said rotary valve core and having a port (607) extending through a side wall thereof; 21. The high pressure gas filling and removal system of claim 20, wherein the valve core sleeve is configured to rotate relative to the rotary valve core such that the replacement gas flow hole is always in communication with the port to form the replacement gas flow path (600a).

22. The port includes a sidewall through hole and an annular groove formed in an inner wall of the valve core sleeve (604); 22. The high pressure gas filling and removal system of claim 21, wherein the annular groove communicates with the sidewall perforation and the replacement gas flow hole communicates with the annular groove such that the port remains in communication with the replacement gas flow hole.

23. The double channel rotary joint further comprises a valve core seat (612) fixedly connected to the valve core sleeve, the valve core seat (612) having a plurality of axial through holes (6121) evenly distributed in a circumferential direction inside the valve core seat; a valve head (614) fixedly connected to the valve core seat; The rotary valve core is provided with a central blind hole (6011) extending along the axial direction and a plurality of radial through holes (6013) evenly distributed in the circumferential direction; A high-pressure gas filling and removal system as described in claim 20 or claim 21, wherein the central blind hole, the radial through hole, the axial through hole (6121) and the internal cavity of the valve head are sequentially connected to form a high-pressure gas flow path (600b).

24. 24. The high pressure gas filling and removal system of claim 23, wherein an axially extending protrusion (6015) is provided on a second end of the rotary valve core and rotatably connected to the valve core seat (612) via a planar bearing (613).

25. the valve core sleeve (604) and the valve core seat (612) are fixedly connected to each other in a mating manner to form a seal; A slot passage is formed between the valve core sleeve and an axial end face of the valve core seat, 25. The high pressure gas filling and removal system of claim 24, wherein the radial through-hole communicates with the axial through-hole through the slot passage.

Images