A quick connector for hydrogen tube bundle vehicle

Abstract

The present invention provides a quick connector for a hydrogen tube bundle vehicle, comprising: a male end, which includes a male gun seat, a gas distribution valve and a pilot valve; a female end, which includes a female gun seat, a gun head sleeve, an outlet valve core and a main valve core, the gun head sleeve is fixedly connected to the female gun seat through a gun body, and the gun body is provided with a gas replacement channel; wherein, in a first state, the pilot valve is closed to make the male end self-sealed, and the outlet valve core and the main valve core are closed to make the female end self-sealed, and in a second state, the gun head sleeve is aligned with the male gun seat and fits together, and the gas replacement channel can be connected to the internal channel of the female end through the main valve core to perform gas replacement, and the outlet valve core can be fit together with the end face of the pilot valve, the pilot valve, the outlet valve core and the main valve core are all opened to connect the internal channels of the male end and the female end, so that the quick connector can be opened under pressure, and the first state and the second state can be switched, so that the pressurized connection and pressurized disconnection of the male end and the female end can be completed.

Description

Technical Field

[0001] The invention belongs to the technical field of gaseous fuel filling equipment, and in particular relates to a quick connector for a hydrogen tube bundle vehicle. Background Art

[0002] In recent years, with the rapid development of the hydrogen energy industry, demand for hydrogen as a new clean energy source has rapidly increased. In particular, the demonstration and commercialization of hydrogen fuel cell vehicles have continued to advance, leading to the establishment of over 300 hydrogen refueling stations in operation both domestically and internationally. However, my country's hydrogen energy development lags significantly behind that of Japan, the United States, and European countries. Currently, the number of operating hydrogen refueling stations accounts for less than 2% of the global total. Existing hydrogen refueling stations also suffer from low hydrogen supply efficiency, inadequate safety risk prevention and control measures, and an incomplete safety technical specification system.

[0003] Hydrogen is a colorless and odorless gas with the characteristics of low density, large diffusion coefficient, low ignition temperature, wide combustion and explosion range, and fast combustion flame speed. It is a flammable and explosive gas. In addition, hydrogen molecules are small and can easily penetrate metal and organic matter and leak. Therefore, in the application of hydrogen energy, the safety issues of hydrogen leakage and explosion are particularly important. A large amount of high-pressure hydrogen is stored in the hydrogen refueling station. Once a leak occurs, it is very easy to form a large-scale combustible gas cloud, and it may also cause a violent explosion accident, posing a serious threat to personal and property safety. The hydrogen supply to hydrogen refueling stations is basically transported by road by tube bundle trucks. The loading and unloading time of hydrogen in the station is relatively long. The reliability of the connection between the tank truck and the loading and unloading pipeline determines the safety of the entire loading and unloading operation.

[0004] Currently, hydrogen tube bundle trucks are loaded and unloaded using threaded joints. After the threaded joints are connected, they need to be tested for leaks using soapy water. If bubbling or other problems occur, they need to be tightened and tested again for leaks. After passing the test, the filling pipeline is purged and the air inside the pipeline is replaced with nitrogen. Only when the air content meets the standard can loading and unloading operations be carried out. The filling pressure of hydrogen tube bundle trucks is 20MPa, and the pressure will be increased to 45MPa in the future. If hydrogen leakage is detected during the loading and unloading of high-pressure hydrogen, the operation must be stopped and the leak point of the connection must be checked. After tightening and leak testing, loading and unloading operations can be carried out again. The connection reliability of the connecting components used in hydrogen loading and unloading operations determines the safety of the entire loading and unloading area. However, the traditional threaded joint connection method is complicated to operate and is prone to hydrogen leakage, resulting in low connection efficiency and poor connection sealing and reliability. Therefore, for low-density and high-pressure hydrogen loading and unloading conditions, a new type of dry quick connector for loading and unloading hydrogen tube bundle trucks is urgently needed. Summary of the Invention

[0005] In response to the technical problems described above, the present invention aims to provide a quick connector for a hydrogen tube bundle vehicle. The quick connector can realize rapid connection and separation between the hydrogen tube bundle vehicle and the hydrogen filling pipeline under pressure. It can realize rapid disassembly to prevent loosening, self-sealing in case of accidental detachment, and safe hydrogen discharge and replacement. It can effectively prevent leakage accidents caused by accidental detachment of the connector, ensure the safety of loading and unloading operations of the hydrogen tube bundle vehicle, and is very beneficial to improving the reliability of the overall connection equipment of the loading and unloading operations.

[0006] To this end, according to the present invention, a quick connector for a hydrogen tube bundle vehicle is provided, comprising: a male end, which includes a male gun seat, a gas distribution valve fixedly installed in the male gun head and a pilot valve adapted to the gas distribution valve; a female end, which includes a female gun seat, a gun head sleeve connected to the front end of the female gun seat, an outlet valve core arranged in the gun head sleeve, and a main valve core installed on the female gun seat, the gun head sleeve is fixedly connected to the female gun seat through a gun body, and the gun body is provided with a gas replacement channel, and the gas replacement channel is used to replace the gas in the female end; wherein, in a first state, the pilot valve is closed to allow the male end to automatically The valve core is sealed, and the outlet valve core and the main valve core are closed to make the female end self-sealed. In the second state, the gun head sleeve is aligned with the male gun seat and fits together. The main valve core can make the gas replacement channel communicate with the internal channel of the female end for gas replacement, and can make the outlet valve core fit together with the end face of the pilot valve. The pilot valve, the outlet valve core and the main valve core are all opened to conduct the internal channels of the male end and the female end, so that the quick connector can be opened under pressure. The first state and the second state can be switched, so as to complete the pressurized connection and pressurized disconnection of the male end and the female end.

[0007] In one embodiment, a stepped flow channel is provided inside the air dividing valve, and the front end inner wall of the air dividing valve is provided with an annular lip extending radially inward, and the annular lip is provided with a plurality of circumferentially evenly distributed flow holes, and the flow holes penetrate the annular lip axially.

[0008] In one embodiment, the pilot valve includes a pilot valve seat and a pilot valve core adapted to be installed in the pilot valve seat, one end of the pilot valve seat is provided with an annular protrusion extending radially outward, and the pilot valve seat sleeve is provided with a second elastic member, the two ends of the second elastic member respectively abut against the annular protrusion and the annular lip, and under the action of the second elastic member, the annular protrusion abuts against the inclined surface formed on the inner wall of the male head gun seat to form a seal.

[0009] In one embodiment, the pilot valve core includes a hollow tube inserted into the pilot valve seat and a valve head connected to the hollow tube, the valve head is provided with an inner conical surface, the inner conical surface is connected to the hollow tube through a through hole extending axially, and the inner conical surface is provided with a plurality of inclined holes passing through the valve head, wherein a first elastic member is provided between the pilot valve seat and the pilot valve core, the hollow tube is uniformly distributed with a plurality of first through holes in the circumference, and the pilot valve seat is uniformly distributed with a plurality of second through holes in the circumference, in a first state, the first through holes and the second through holes are staggered, so that the pilot valve is closed; in a second state, the first elastic member can be compressed to connect the first through hole with the second through hole, thereby opening the replacement channel of the pilot valve, and can push the pilot valve seat to compress the second elastic member so that the annular protrusion is disengaged from the inclined surface of the inner wall of the male head gun seat, thereby connecting the inclined holes to open the loading and unloading channel of the pilot valve.

[0010] In one embodiment, the outlet valve core is installed inside the gun head sleeve through the outlet valve core sleeve, and the outlet valve core is constructed to include a hollow tube body and a solid umbrella-shaped circular body arranged at the axial inner end of the hollow tube body, and a first oblique through-tube hole and a second oblique through-tube hole are respectively provided on both axial sides of the solid umbrella-shaped circular body, and a third elastic member is provided between the outlet valve core and the main valve core. In the first state, the solid umbrella-shaped circular body abuts against the inclined surface formed in the outlet valve core sleeve under the action of the third elastic member to form a seal, thereby making the first oblique through-tube hole and the second oblique through-tube hole non-conductive. In the second state, the outlet valve core moves axially inward and compresses the third elastic member to disengage the inclined surface of the solid umbrella-shaped circular body in the outlet valve core sleeve, thereby making the first oblique through-tube hole and the second oblique through-tube hole conductive.

[0011] In one embodiment, the main valve core is installed on the female gun seat through the main valve core seat, the main valve core seat is fixed in the female gun seat, and an annular space is formed between the main valve core seat and the female gun seat, the main valve core seat is constructed into a cylindrical shape with one end closed, and a plurality of through inclined holes are provided at the closed end, and a plurality of switch holes are evenly distributed circumferentially on the side wall of the main valve core seat, and the through inclined holes are connected to the switch holes through the annular space.

[0012] In one embodiment, a plurality of third through holes are uniformly distributed circumferentially on the side wall of the main valve core near the axial inner end, and a first energy storage sealing ring is provided between the main valve core and the main valve core seat and on both axial sides of the switch hole. The main valve core is constructed so that the third through holes and the switch hole can be staggered in the axial direction to close the main valve core, and the main valve core can be moved axially relative to the main valve core seat so that the third through holes and the switch hole are correspondingly connected, thereby opening the main valve core.

[0013] In one embodiment, an annular boss is provided on the outer peripheral surface of the main valve core, and the annular boss is constructed with transmission teeth extending along the axial direction. A handle gear adapted to the transmission teeth is provided in the inner wall of the gun body, and the main valve core can be driven to move axially by rotating the handle gear.

[0014] In one embodiment, one end of the gas replacement channel is connected to the internal space of the gun body, and the other end is formed as a replacement gas valve port.

[0015] In one embodiment, a fourth through hole is provided on the side wall of the main valve core near the axial outer end, and a second energy storage sealing ring is provided between the main valve core and the outlet valve core sleeve. The main valve core can move the fourth through hole to the axial outside of the second energy storage sealing ring to close the fourth through hole, and can move the fourth through hole to the axial inside of the second energy storage sealing ring, thereby connecting the fourth through hole and the gas replacement channel.

[0016] In one embodiment, a holding sleeve is mounted on the outer side of the gun head sleeve, a fourth elastic member is provided between the holding sleeve and the gun head sleeve, the inner wall of the holding sleeve is provided with a first limiting step, the outer wall of the gun head sleeve is provided with a second limiting shoulder, and the two ends of the fourth elastic member respectively abut against the first limiting step and the second limiting step.

[0017] In one embodiment, the gun head sleeve is provided with a plurality of circumferentially evenly distributed mounting holes, and claws are respectively installed in the mounting holes. A claw supporting sleeve is provided between the gun head sleeve and the outlet valve core sleeve, and a fifth elastic member is provided between the claw supporting sleeve and the axial direction of the gun body. A claw groove is provided on the outer wall of the male gun seat near the front end. In the first state, the claw supporting sleeve supports the claw under the action of the fifth elastic member, so that the claw forms an axial limitation on the holding sleeve. In the second state, the male gun seat pushes the claw supporting sleeve to move axially and compresses the fifth elastic member until the movement causes the plurality of claws to fall into the claw grooves respectively, so that the male gun seat and the gun head sleeve are locked to form a self-sealing.

[0018] In one embodiment, the holding sleeve is configured to be able to generate axial movement by applying a force in the second state, and the claw is configured to automatically pop up from the claw groove when the holding sleeve moves to the point where its inner wall surface leaves the mounting hole, thereby resetting the multiple claws and re-limiting the holding sleeve, thereby causing the male end and the female end to form self-seals at the same time to complete the disconnection and self-sealing.

[0019] In one embodiment, the male gun seat is provided with a first leakage detection hole for detecting in real time the failure leakage of the first seal installed between the male gun seat and the air distribution valve; a second leakage detection hole is provided on the side wall near the middle position of the gun body for detecting in real time the failure leakage of the second seal installed between the gun body and the main valve core; a third leakage detection hole is provided on the side wall near the rear end of the gun body for detecting in real time the failure leakage of the third seal installed between the female gun seat and the main valve core seat.

[0020] Compared with the prior art, the advantages of this application are:

[0021] The quick connector for the hydrogen tube bundle vehicle according to the present invention can realize the rapid connection and separation of the hydrogen tube bundle vehicle and the hydrogen filling pipeline. It can realize the rapid disassembly and anti-loosening of the male end and the female end through the cooperation of the claw, the claw support sleeve and the holding sleeve. By utilizing the cooperation of the pilot valve seat and the pilot valve core movement, even if there is high-pressure hydrogen inside the male end, after the male and female connectors are connected, the outlet valve core can easily push open the pilot valve seat, open the hydrogen flow channel, and realize the rapid loading and unloading of high-pressure hydrogen. The quick connector realizes the self-sealing of the gas separation valve at the male end and the self-sealing of the outlet valve core at the female end through the elastic part, realizes the gas phase balance of the outlet valve of the male end and the female end through the pilot valve, realizes the pressurized connection of the male end and the female end, and realizes the pressurized disconnection of the male end and the female end by rotating the handle. The quick connector enables safe hydrogen release and replacement. It utilizes a gas replacement channel and handle to replace the air inside the female connector before loading and unloading, and replaces the hydrogen inside the female connector after loading and unloading. This significantly reduces the amount of hydrogen replacement and the risk of hydrogen replacement. It effectively prevents leakage accidents caused by accidental connector detachment, ensures the safety of hydrogen tube bundle truck loading and unloading operations, and is very helpful in improving the reliability of the overall connection equipment for loading and unloading operations. Furthermore, the first, second, and third leak detection holes enable real-time detection of sealing ring failure and leakage during hydrogen loading and unloading. A portable hydrogen detector can be used to determine if the corresponding sealing ring in the quick connector has failed. Compared to the current long hose gas volume, this quick connector significantly reduces the amount of hydrogen released and the risk of release. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 The figure shows the structure of the quick connector for hydrogen tube bundle vehicle according to the present invention in a state where the male end and the female end are separated.

[0024] Figure 2 Shows the connection status of the male and female ends of the quick connector.

[0025] Figure 3 Shows the open state of the pilot valve of the quick connector.

[0026] Figure 4 The quick connector's gas displacement channel is shown in its open state.

[0027] Figure 5 The quick connector's internal passage is shown open.

[0028] Figure 6 It is a three-dimensional diagram of a quick connector.

[0029] In this application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn to scale. DETAILED DESCRIPTION

[0030] The present invention will be described below with reference to the accompanying drawings.

[0031] It should be noted that the directional terms or qualifiers "left", "right", etc. used in this application are all directed to the attached drawings to which they are referred. Figure 1 It is only for the convenience of describing the present invention and simplifying the description. They are not used to limit the absolute positions of the components involved, but may vary according to specific circumstances.

[0032] Figure 1 The figure shows the structure of the male end 200 and the female end 300 of the quick connector 100 for hydrogen tube bundle vehicle according to the present invention in a separated state (ie, a first state). Figure 1 As shown, the quick connector 100 includes a male end 200 and a female end 300. The male end 200 is used to connect to the hydrogen tube bundle vehicle (tank vehicle), and the female end 300 is used to connect to the hydrogen filling pipeline of the hydrogen filling station. The male end 200 and the female end 300 can be quickly connected and disconnected, thereby realizing the rapid connection and disconnection of the hydrogen tube bundle vehicle and the hydrogen filling pipeline, ensuring safety during loading and unloading, and ensuring the reliability of the seal at the connection between the hydrogen tube bundle vehicle and the hydrogen filling pipeline. In this way, rapid loading and unloading of the hydrogen tube bundle vehicle is achieved. When the male end 200 is disconnected from the female end 300, the quick connector 100 is in a first state. When the male end 200 is connected to the female end 300, the quick connector 100 is in a second state.

[0033] like Figure 1 As shown, the male end 200 includes a male gun holder 1 for connecting to the hydrogen pipe bundle vehicle, a gas separation valve 2 fixedly installed in the male gun head 1, and a pilot valve 10 adapted to the gas separation valve 2. One end of the male gun holder 1 is provided with ( Figure 1The inner thread (left end) of the air separator is used to connect to the loading and unloading pipe of the tube bundle vehicle through threads. The air separator valve 2 is constructed as a tubular structure, with a hexagonal hole on the left and a circular hole in the center of the right side, thereby forming a stepped flow channel inside the air separator valve 2. The inner wall of the front end of the air separator valve 2 is provided with an annular lip extending radially inward, and the annular lip is provided with a plurality of flow holes 201 evenly distributed in the circumferential direction, and the flow holes 201 pass through the annular lip axially. The outer surface of the air separator valve 2 is provided with an external thread, and the air separator valve 2 is fixedly connected to the male gun seat 1 through the external thread. The term "front end" here refers to the end of the male end 200 away from the hydrogen tube bundle vehicle when connected.

[0034] In order to ensure the sealing of the connection between the air separator 2 and the male gun holder 1, a rectangular groove is provided on the right outer ring of the air separator 2, and a seal 3 is installed in the rectangular groove. Preferably, the seal 3 is an O-ring. A first leakage detection hole 37 is provided on the right end side wall of the internal thread of the male gun holder 1. A portable hydrogen detector can be used to detect whether the corresponding sealing ring of the quick connector 100 has failed. The first leakage detection hole 37 can detect the failure and leakage of the seal 3 in real time during the hydrogen loading and unloading process, so that the first leakage detection hole 37 can be used to monitor whether the O-ring 3 has failed in sealing.

[0035] According to the present invention, the pilot valve 10 includes a pilot valve seat 4 and a pilot valve core 101 adapted to be installed in the pilot valve seat 4. Figure 1 As shown, the pilot valve seat 4 is constructed as a cylindrical structure with a circular bottom surface on the left side and a central hole set from the right to the left. The left cylindrical wall of the pilot valve seat 4 is tightly inserted into the right circular hole of the air distributor 2. Two rectangular grooves are set on the right side of the inner wall of the pilot valve seat 4, and O-type sealing rings 7 and 8 are installed in the two rectangular grooves respectively. A plurality of second through holes are evenly distributed in the circumferential direction on the side wall of the pilot valve seat 4 between the two rectangular grooves. One end of the pilot valve seat 4 ( Figure 1 A radially outward-extending annular protrusion (at the right end) is provided. The right end face of the annular protrusion is configured as an inclined surface with a circular groove formed therein. An O-ring 9 is mounted within the circular groove. A second elastic member 6 is sleeved around the outer periphery of the pilot valve seat 4. The two ends of the second elastic member 6 respectively abut against the annular protrusion and the annular lip. Under the action of the second elastic member 6, the annular protrusion abuts against the inclined surface formed on the inner wall of the male gun holder 1, forming a tight press fit, thereby creating a seal. Preferably, the second elastic member 6 is a compression spring.

[0036] like Figure 1As shown, the pilot valve core 101 comprises a hollow tube inserted into the pilot valve seat 4 and a valve head connected to the hollow tube. The valve head has an inner conical surface, which communicates with the hollow tube via an axially extending through-hole 102. The inner conical surface is provided with multiple oblique holes 103 extending through the valve head. It should be understood that the oblique holes 103 extend from the inner conical surface to the left end face of the valve head, thereby forming a tube connection. The left hollow tube of the pilot valve 10 is inserted into the pilot valve seat 4. The hollow tube is provided with multiple first through-holes evenly distributed along the circumference. A first elastic member 5 is provided between the pilot valve seat 4 and the pilot valve core 101. Preferably, the first elastic member 5 is a compression spring. The left end of the first elastic member 5 presses against the left concave step surface of the pilot valve seat 4, while the right end of the first elastic member 5 presses against the arcuate vertical surface of the left hollow tube of the pilot valve core 101.

[0037] In this embodiment, the outer periphery of the valve head of the pilot valve core 101 is provided with an outer annular step, facing rightward. Simultaneously, an inner annular step, facing leftward, is provided on the inner wall of the male gun holder 1. Under the spring force of the first elastic member 5, the outer annular step of the pilot valve core 101 is always pressed tightly against the inner annular step within the male gun holder 1, limiting the rightward movement of the pilot valve core 101.

[0038] In the first state, the first through-hole on the pilot valve core 101 and the second through-hole on the pilot valve seat 4 are offset, closing the pilot valve 10. In the second state, by pushing the pilot valve core 101 leftward to compress the first elastic member 5, the first through-hole and the second through-hole are connected, allowing the air separator 2 to communicate sequentially through the flow hole 201, the annular space between the pilot valve seat 4 and the male connector 1, the second through-hole, and the through-hole 102 in the center of the first through-hole valve head, thereby opening the displacement passage of the pilot valve 10. Furthermore, in the second state, the pilot valve seat 4 can be pushed to compress the second elastic member 6, causing the annular protrusion to disengage from the inclined surface of the male connector inner wall, allowing the air separator 2 to communicate sequentially through the flow hole 201, the annular space between the pilot valve seat 4 and the male connector 1, and the inclined hole 103, thereby opening the installation and removal passage of the pilot valve 10.

[0039] In addition, a rectangular groove is provided on the inner wall of the male gun holder 1 near the right side, and an O-ring 11 is installed in the rectangular groove to ensure the sealing performance between the male end 200 and the female end 300 when they are connected.

[0040] According to the present invention, the male gun holder 1, the air distribution valve 2, the pilot valve 10 and other components of the male end 200 are all made of 316 stainless steel, which is very helpful in avoiding the occurrence of hydrogen embrittlement.

[0041] According to the present invention, the female end 300 includes a female gun base 34, a gun barrel 12 connected to the front end (the left end in FIG. 2 ) of the female gun base 34, an outlet valve core 13 disposed within the gun barrel 12, and a main valve core 28 mounted on the female gun base 34. The term "front end" herein refers to the end of the female end 300 that is away from the hydrogen filling line of the hydrogen filling station when connected, and the "rear end" of the female end 300 herein refers to the end of the female end 300 that is closer to the hydrogen filling line of the hydrogen filling station when connected.

[0042] like Figure 1 As shown, the gun head sleeve 12 is fixedly connected to the female gun base 34 through the gun body 27. The gun head sleeve 12 is constructed as a tubular structure, the right end of the gun head sleeve 12 is provided with an internal thread, and the left end of the gun body 27 is provided with an external thread, and the gun head sleeve 12 and the gun body 27 are connected together by threads.

[0043] According to the present invention, Figure 1 As shown, the outlet valve core 13 is constructed to include a hollow tubular body and a solid, umbrella-shaped body disposed axially inwardly at the hollow tubular body. A first oblique through-hole 131 and a second oblique through-hole 132 are respectively provided on either axial side of the solid umbrella-shaped body. The outlet valve core 13 is mounted within the gun head sleeve 12 via an outlet valve core sleeve 15. The outlet valve core sleeve 15 is a tubular structure with external threads on the right side and internal threads on the left side of the gun body 27. The outlet valve core sleeve 15 and the gun body 27 are connected by threads. A circular groove is circumferentially defined at the right end of the outlet valve core sleeve 15, within which an O-ring 25 is installed. This ensures a tight seal at the interface between the outlet valve core sleeve 15 and the gun body 27. The inner wall of the outlet valve core sleeve 15 is provided with a trapezoidal groove and a rectangular groove. The rectangular groove is axially inwardly located within the trapezoidal groove. An O-ring 19 is installed within the trapezoidal groove, while an O-ring 20 is installed within the rectangular groove. The outer wall of the left side of the outlet valve core 13 is in close contact with the O-ring 19, achieving a seal. Portions of the inner wall of the outlet valve core sleeve 15 are formed into an inclined surface, with a corresponding rectangular groove positioned on the inclined surface. Furthermore, an annulus is formed between the outlet valve core 13 and the outlet valve core sleeve 15.

[0044] The outlet valve core 13 is located within the gun head sleeve 12, while the main valve core 28 is mounted on the female gun seat 34 and located within the gun body 27. A third elastic member 23 is provided between the outlet valve core 13 and the main valve core 28. The third elastic member 23 is preferably a compression spring. 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. The left end of the third elastic member 23 presses against the vertical surface of the first concave step of the outlet valve core 13, while the right side of the third elastic member 23 presses against the vertical surface of the second concave step of the main valve core 28. In the first state, the solid umbrella-shaped body, under the action of the third elastic member 23, abuts against the inclined surface within the outlet valve core sleeve 15 and presses against the O-ring 20, forming a seal, thereby blocking the first oblique through-hole 131 and the second oblique through-hole 132. In the second state, the outlet valve core 13 can move axially inward and compress the third elastic member 23 to disengage the inclined surface inside the solid umbrella-shaped circular outlet valve core sleeve 15, thereby allowing the first oblique through-hole 131 and the second oblique through-hole 132 to be connected through the annular space between the outlet valve core 13 and the outlet valve core sleeve 15.

[0045] According to the present invention, Figure 1 As shown, the main valve core 28 is mounted on the female gun base 34 via a main valve core seat 33. The main valve core seat 33 is fixedly mounted within the female gun base 34, with an annular space formed between the main valve core seat 33 and the female gun base 34. The main valve core seat 33 is cylindrical with one end closed. The right side of the main valve core seat 33 has a circular bottom surface, and the right end of the main valve core 28 is inserted into the main valve core seat 33. A plurality of through-holes 331 are provided at the closed end of the main valve core seat 33. A plurality of switch holes 332 are evenly distributed circumferentially along the sidewall of the main valve core seat 33. The through-holes 331 communicate with the switch holes 332 through the annular space. A plurality of third through-holes 281 are evenly distributed circumferentially along the sidewall of the main valve core 28 near the axial inner end. Internal concave steps are provided on the outer walls of the main valve core seat 33 on both sides of the switch holes 332. First energy-storage sealing rings 31 and 32 are mounted on the two inner concave steps, respectively, to seal the main valve core 28 against the main valve core seat 33. The main valve core 28 is configured to allow the third through hole 281 to be axially offset from the switch hole 332 to close the main valve core 28, and to allow the main valve core 28 to move axially relative to the main valve core seat 33, thereby connecting the third through hole 281 to the switch hole 332 and opening the main valve core 28.

[0046] In one embodiment, the main valve core seat 33 is provided with short external threads on the left side, and the gun body 27 is provided with short internal threads on the right side. The main valve core seat 33 and the gun body 27 are connected by a threaded connection. The female gun seat 34 is a tubular structure with external threads on the left side and internal threads on the right side of the gun body 27. The female gun seat 34 and the gun body 27 are connected by a threaded connection. The main valve core seat 33 is mounted within the female gun seat 34. The left outer wall of the main valve core seat 33 is provided with a trapezoidal groove, and a third sealing member 30 is installed in the trapezoidal groove. The third sealing member 30 is preferably an O-ring 30, which ensures a seal between the main valve core seat 33 and the female gun seat 34.

[0047] According to the present invention, a third leak detection hole 39 is provided on the sidewall of the gun body 27 near the rear end. Specifically, the third leak detection hole 39 is located at the left end of the internal thread on the right side of the gun body 27. Using a portable hydrogen detector, leakage detection can be performed to determine if the corresponding sealing ring of the quick connector 100 has failed. This third leak detection hole 39 enables real-time detection of sealing ring failure and leakage during hydrogen loading and unloading, thereby monitoring whether the O-ring 30 has failed.

[0048] like Figure 1 As shown, an annular boss is provided on the outer peripheral surface near the middle of the main valve core 28. The annular boss is configured with transmission teeth 282 extending in the axial direction. A handle gear 41 is provided on the inner wall of the gun body 27 to match the transmission teeth 282. By rotating the handle gear 41, the main valve core 28 can be driven to move in the axial direction. A large arc groove is provided on the side wall of the gun body 27, and the handle gear 29 is installed in the large arc groove of the gun body 27. A handle 50 is provided outside the gun body 27 (see Figure 6 ), the handle 50 is connected to the handle gear 29, and the rotation of the handle gear 29 is controlled by the handle 50, and the rotation angle is 0-180°.

[0049] According to the present invention, Figure 1 As shown, a gas replacement channel 40 is provided within the gun body 27. One end of the gas replacement channel 40 communicates with the interior space of the gun body 27, and the other end forms a replacement gas valve port 35. The gas replacement channel 40 can replace the air within the female end 300 before loading and unloading, and replace the hydrogen within the female end 300 after loading and unloading, greatly reducing the amount of hydrogen replacement and the risk of hydrogen replacement. The gas replacement channel 40 is equipped with a needle valve 36 for controlling the opening and closing of the gas replacement channel 40. The replacement gas valve port 35 can be connected to an overhead discharge pipeline or nitrogen pipeline by switching the loading and unloading column valve.

[0050] In one embodiment, the gun body 27 is constructed as an asymmetrical tubular structure. For example, the sidewall thickness of the tubular string in the upper half of the gun body 27 is greater than that of the tubular string in the lower half. A displacement gas valve port 35 is provided in the upper portion of the gun body 27. The left oblique tube of the displacement gas valve port 35 extends into the gun body 27, and the end of the left oblique tube of the displacement gas valve port 35 reaches the right end of the outlet valve core sleeve 15. A rectangular groove is provided in the gun body 27, to the right of the end of the left oblique tube of the displacement gas valve port 35. The second seal 26 is mounted in this rectangular groove. The second seal 26 is preferably an O-ring, which seals the main valve core 28 with the gun body 27.

[0051] According to the present invention, a second leak detection hole 38 is provided on the lower tubing string at the center of the gun body 27. A portable hydrogen detector can be used to detect leakage of the corresponding sealing ring of the quick connector 100. This second leak detection hole 38 can detect leakage of the sealing ring in real time during hydrogen loading and unloading, thereby monitoring whether the O-ring 26 has failed.

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

[0053] According to the present invention, a fourth through hole 283 is provided on the side wall of the main valve core 28 near the axial outer end. For example, a concave step is provided on the left inner wall of the main valve core 28, and a plurality of fourth through holes 283 uniformly distributed in the circumferential direction are provided on the left side of the concave step on the left side of the main valve core 28. A concave step is provided on the right inner wall of the outlet valve core sleeve 15, and a second energy storage sealing ring 24 is provided between the outer wall of the left tube of the main valve core 28 and the wall of the concave step at the right end of the outlet valve core sleeve 15, thereby achieving sealing between the main valve core 28 and the outlet valve core sleeve 15. The main valve core 28 can move axially. Specifically, the handle gear 29 rotates 45° clockwise to move the fourth through hole 283 to the axial outside of the second energy storage sealing ring 24, thereby closing the fourth through hole 283. When the handle gear 29 is in the zero state (see Figure 1 The fourth through hole 283 moves to the axially inner side of the second energy storage seal ring 24, thereby connecting the fourth through hole 283 with the gas displacement channel 40. Thus, the fourth through hole 283 is opened and closed, and the gas displacement channel 40 is closed and connected.

[0054] According to the present invention, Figure 1As shown, a gripping sleeve 16 is sleeved on the outside of the gun tip sleeve 12. The gripping sleeve 16 is constructed as a tubular structure and is entirely sleeved on the outside of the gun tip sleeve 12. A fourth elastic member 21 is provided between the gripping sleeve 16 and the gun tip sleeve 12. The fourth elastic member 21 is preferably a compression spring. A first limiting step with its end facing right is provided on the inner wall of the gripping sleeve 16, and a second limiting step with its end facing left is provided on the outer wall of the gun tip sleeve 12. The two ends of the fourth elastic member 21 respectively abut against the first limiting step and the second limiting step. An arc groove is provided on the outer ring of the left side of the gun tip sleeve 12, and a gripping sleeve retaining ring 17 is installed in the arc groove to limit the axial movement range of the gripping sleeve 16.

[0055] like Figure 1 As shown, the sidewall of the gun head sleeve 12, near the left end, is provided with multiple circumferentially evenly spaced mounting holes. These holes extend through the sidewall of the gun head sleeve 12, each of which houses a claw 18. A claw support sleeve 14 is located between the gun head sleeve 12 and the outlet valve core sleeve 15. This tubular sleeve features an outer circumferential step on its right side. A fifth elastic member 22 is located axially between the sleeve 14 and the gun body 27. Its two ends abut against the right end of the outer circumferential step and the left end face of the gun body 27, respectively. The fifth elastic member 22 is preferably a compression spring. Furthermore, a claw recess 42 is located on the outer wall of the male gun holder 1, near the front end. The spring force of the fifth elastic member 22 keeps the outer circumferential step on the right side of the claw support sleeve 14 firmly pressed against the inner step in the left center portion of the gun head sleeve 12. When the male end 200 and the female end 300 are in an unconnected state, the claw support sleeve 14 radially supports the claw 18 , causing the arc surface of the radial outer end of the claw 18 to be in close contact with the holding sleeve 16 , thereby achieving the limiting effect of the claw 18 on the holding sleeve 16 .

[0056] In the first state, the claw support sleeve 14, under the action of the fifth elastic member 22, supports the claw 18, causing the claw 18 to axially restrict the gripping sleeve 16. At this point, under the spring force of the fourth elastic member 21, the left inner inclined surface of the gripping sleeve 16 presses tightly against the outer curved surface of the claw 18, limiting the leftward movement of the gripping sleeve 16 via the claw 18.

[0057] In the second state, the male gun mount 1 pushes the claw support slide 14 to move axially, compressing the fifth elastic member 22 until the claws 18 correspondingly fall into the claw grooves 42, locking the male gun mount 1 and the gun head sleeve 12 into a self-sealing state, thereby completing the connection between the male end 200 and the female end 300. Once the male end 200 and the female end 300 are connected and the claws 18 fall into the grooves 42 of the male gun mount 1, the gripping sleeve 16 continues to move leftward under the action of the fourth elastic member 21 until the left inner inclined surface of the gripping sleeve 16 is tightly pressed against the outer curved surface of the gripping sleeve retaining ring 17.

[0058] In this embodiment, the gripping sleeve 16 is configured to be able to generate axial movement by applying a force in the second state, and the claws 18 are configured to automatically pop out of the claw grooves 42 when the gripping sleeve moves to the point where its inner wall surface leaves the mounting hole, thereby resetting the multiple claws 18 and re-limiting the gripping sleeve 16, thereby causing the male end 200 and the female end 300 to simultaneously form a self-seal and complete the disconnection and self-sealing. Thus, the quick connector 100 achieves rapid disassembly and anti-loosening of the male end 200 and the female end 300 through the cooperation of the claws 18, the claw support sleeve 14, and the gripping sleeve 16.

[0059] According to one embodiment of the present invention, the female gun seat 34, gun head sleeve 12, outlet valve core 13, outlet valve core sleeve 15, main valve core 28, main valve core seat 33, gun body 27, claw support slide 14, and holding slide 16 of the female end 300 are all made of 316 stainless steel, which is very helpful in avoiding the occurrence of hydrogen embrittlement.

[0060] Preferably, the O-rings used in the present invention are all made of UPE, which exhibits excellent resistance to wear, impact, corrosion, hydrogen absorption and swelling, stamping, and high temperature. The first energy storage seals 31 and 32, as well as the second energy storage seal 24, utilize an internal 304 stainless steel spring coil combined with an external UPE. This imparts excellent resistance to hydrogen absorption and swelling, wear, impact, and corrosion, while also providing a self-compensating seal that meets the requirements of high-pressure dynamic sealing.

[0061] The quick connector 100 for a hydrogen tube bundle vehicle according to the present invention can realize the rapid connection and separation between the hydrogen tube bundle vehicle and the hydrogen filling pipeline. It can realize the rapid disassembly and anti-loosening of the male end 200 and the female end 300 through the cooperation of the claw 18, the claw support sleeve 14 and the holding sleeve 16. By utilizing the movement cooperation between the pilot valve seat 4 and the pilot valve core 101, even if there is high-pressure hydrogen inside the male end 200, after the male and female connectors are connected, the outlet valve core 13 can easily push open the pilot valve seat 4, open the hydrogen flow channel, and realize the rapid loading and unloading of high-pressure hydrogen. The quick connector 100 uses an elastic member to achieve the self-sealing of the gas distribution valve 2 of the male end 200 and the self-sealing of the outlet valve core 13 of the female end 300. The pilot valve 10 is used to achieve gas phase balance between the outlet valves of the male end 200 and the female end 300, thereby connecting the male end 200 and the female end 300 under pressure. The male end 200 and the female end 300 are disconnected under pressure by rotating the handle. The quick connector 100 can achieve safe release and replacement of hydrogen. It uses the gas replacement channel 40 and the handle to achieve the replacement of the internal air of the female end 300 before loading and unloading, and the replacement of the internal hydrogen of the female end 300 after loading and unloading. This greatly reduces the amount of hydrogen replacement and the risk of hydrogen replacement, effectively prevents leakage accidents caused by accidental connector detachment, ensures the safety of loading and unloading operations of hydrogen tube bundle vehicles, and is very helpful in improving the reliability of the overall connection equipment for loading and unloading operations. Furthermore, the first, second, and third leak detection holes 37, 39, and 38 allow for real-time detection of seal failure and leakage during hydrogen loading and unloading. A portable hydrogen detector can be used to determine if the corresponding seal in the quick connector 100 has failed. Compared to existing long hoses, this quick connector 100 significantly reduces the amount of hydrogen released and the risk of release.

[0062] The working process of the quick connector 100 for the hydrogen tube bundle vehicle according to the present invention is briefly described below.

[0063] Before connecting the male end 200 and the female end 300, it is necessary to ensure that the rotation angle of the handle 50 of the female end 300 is 0° so that the handle gear 29 of the female end 300 is in a zero state. The operator holds the holding slide 16 of the female end 300 with both hands, aligns the gun head sleeve 12 with the male gun seat 1 of the male end 200, and pushes the female end 300 to the left as a whole. The right end face of the male gun seat 1 presses against the left end face of the claw support slide 14. The male gun seat 1 will force the claw support slide 14 to move to the right, and the fourth elastic member 21 will be compressed. When the claw groove 42 of the male gun seat 1 is facing the radial inner end of the claw 18, the outer arc surface of the claw 18 is subjected to the radial force of the inner inclined surface on the left side of the holding slide 16, so that the claw 18 instantly falls into the claw groove 42 of the male gun seat 1. The holding slide 16 continues to move to the left under the action of the fourth elastic member 21 until the inner inclined surface on the left side of the holding slide 16 is tightly pressed against the outer arc surface of the holding sleeve retaining ring 17, thereby forming a limitation. Figure 2 The figure shows the male end 200 and female end 300 of the quick connector 100 connected. At this point, the pilot valve core shaft 101 has only slightly moved leftward, the pilot valve 10 has not yet opened, the outlet valve core 13 has moved rightward relative to the main valve core 28, and the third elastic member 23 is in a more compressed state. The outlet valve core 13 and the male gun holder 1 are sealed by an O-ring 11.

[0064] Before loading and unloading hydrogen, the air inside the outlet valve core 13 and main valve core 28 must be completely replaced. By switching the valves on the loading and unloading column, connect the replacement gas valve port 35 of the gas replacement gas channel 40 to the nitrogen pipeline on the loading and unloading column. First, open the needle valve 36 to inject 0.6 MPa nitrogen gas into the outlet valve core 13 and main valve core 28 through the gas replacement gas channel 40. Then, close the needle valve 36. By switching the valves on the loading and unloading column, connect the replacement gas valve port 35 to the high-altitude evacuation line on the loading and unloading column. Then, open the needle valve 36 again to exhaust the air inside the outlet valve core 13 and main valve core 28. Repeat this nitrogen replenishment process at least twice to complete the nitrogen replacement of the air inside the outlet valve core 13 and main valve core 28.

[0065] Then, rotate the handle 45° clockwise, and the handle gear 29 drives the transmission tooth 282 on the middle part of the main valve core 28 to move the main valve core 28 to the left. The main valve core 28 pushes the third elastic member 23 to move to the left, and the third elastic member 23 pushes the outlet valve core 13 to move to the left. The outlet valve core 13 pushes the pilot valve 10 to move to the left, and the first through hole in the middle of the hollow tube of the pilot valve 10 coincides with the second through hole in the middle of the two rectangular grooves inside the pilot valve seat 4, and the displacement channel of the pilot valve 10 is opened. Figure 3 The quick connector 100's pilot valve 10 is shown in the open state. At this point, hydrogen from the hydrogen pipe bundle enters the gas distributor valve 2 through the left hexagonal hole. From there, the hydrogen passes through the circular hole on the right side of the gas distributor valve 2 and the flow hole 201, entering the annular space between the pilot valve seat 4 and the male gun holder 1. Further, the hydrogen enters the through-hole 102 of the pilot valve core 101 through the second through-hole in the pilot valve seat 4 and the first through-hole in the hollow tube of the pilot valve core 101. From through-hole 102, the hydrogen enters the outlet valve core 13 and the main valve core 28. When the pilot valve 10 is open, the high-pressure hydrogen at the loading and unloading column remains sealed to the right of the two first energy storage seals 31 and 32.

[0066] Then, rotate the handle 45° counterclockwise to return it to zero. Connect the replacement gas valve port 35 to the high-altitude exhaust pipeline of the loading and unloading column through the valve switch of the loading and unloading column, and open the needle valve 36 to discharge the gas in the outlet valve core 13 and the main valve core 28. Repeat the above operation to replenish hydrogen from the hydrogen pipe bundle vehicle end twice to complete the replacement of nitrogen in the outlet valve core 13 and the main valve core 28 with hydrogen.

[0067] Then, close the needle valve 36, as shown in FIG. Figure 3 As shown, rotate the handle 45° clockwise to open the pilot valve 10. At this time, the hydrogen in the male end 200 enters the outlet valve core 13 and the main valve core 28 of the female end 300, and the pressure of the gas phase space on the left and right sides of the pilot valve 10 is balanced. Figure 4 As shown, if the handle is further rotated clockwise to 180°, the handle gear 29 drives the handle gear 29 on the main valve core 28, causing the main valve core 28 to move leftward. The main valve core 28 pushes the third elastic member 23 leftward, which in turn pushes the outlet valve core 13 leftward. The outlet valve core 13 pushes the pilot valve core 101 leftward. The left end surface of the pilot valve core 101 presses against the inner left end bottom surface of the pilot valve seat 4. The pilot valve core 101 pushes the pilot valve seat 4 leftward, and the O-ring 9 on the right outer annular boss of the pilot valve seat 4 clears the inner inclined surface of the male gun holder 1, opening the hydrogen flow space outside the pilot valve seat 4. When the handle is rotated to 180°, the main valve core 28 moves leftward into position, and the third through hole 281 on the right side of the main valve core 28 coincides with the switch hole 332 in the center of the main valve core seat 33, establishing communication between the gas phase of the main valve core 28 and the space outside the main valve core seat 33. The flow direction of the filling hydrogen is as follows: the hydrogen in the loading and unloading pipeline of the loading and unloading column enters the interior of the female gun seat 34 through the female gun seat 34, and the hydrogen enters the annular space between the main valve core seat 33 and the female gun seat 34 through the through inclined hole 331 on the right circular bottom surface of the main valve core seat 33 from the inside of the female gun seat 34, and the hydrogen enters the internal space of the main valve core 28 from the third through hole 281 and the switch hole 332, and the hydrogen passes from the internal space of the main valve core 28 to the left in turn through the second oblique through-hole 132 on the right side of the solid umbrella-shaped round body 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 oblique through-hole 131 Once inside the outlet valve core 13, hydrogen flows leftward from inside the outlet valve core 13 into the right inner conical space of the pilot valve core 101. From there, the hydrogen passes through the right inner conical space of the pilot valve core 101, through the oblique hole 103 in the valve head of the pilot valve 10, and into the outer space of the pilot valve seat 4. From there, the hydrogen passes through the flow hole 201 on the right side of the gas distributor valve 2, and into the inner space of the gas distributor valve 2. From there, the hydrogen passes through the inner space of the gas distributor valve 2, through the hexagonal hole on the left side of the gas distributor valve 2, and into the loading and unloading pipeline for the hydrogen bundle vehicle. The direction of hydrogen unloading is the opposite of the filling gas flow direction. Figure 4 The quick connector 100 is shown with its internal flow passage open.

[0068] After completing the hydrogen loading and unloading operation, rotate the handle 180° counterclockwise to zero. The high-pressure hydrogen at the hydrogen bundle vehicle end is now resealed to the left of the O-ring 9, and the high-pressure hydrogen at the loading and unloading column end is resealed to the right of the two first energy storage seals 31 and 32. By switching the valves on the loading and unloading column, connect the replacement gas valve port 35 to the column's high-altitude discharge line. Open the needle valve 36 to discharge the hydrogen from the outlet valve core 13 and the main valve core 28. The hydrogen flow direction is: hydrogen flows from the internal space of the outlet valve core 13 and the main valve core 28 through the fourth through hole 283 of the concave step on the left side of the main valve core 28 into the gap space between the main valve core 28 and the end of the left inclined tube of the replacement gas valve pipe 35, hydrogen flows from the gap space between the main valve core 28 and the end of the left inclined tube of the replacement gas valve pipe 35 into the left inclined tube of the replacement gas valve pipe 35, hydrogen flows from the left inclined tube of the replacement gas valve pipe 35 into the horizontal tube of the gas replacement channel 40, and hydrogen flows from the horizontal tube of the replacement gas valve pipe 35 through the needle valve 36 into the loading and unloading pipeline of the loading and unloading column. Figure 5 The quick connector 100 is shown in an open state of the replacement gas valve port 35 and the needle valve 36 .

[0069] When the hydrogen in the outlet valve core 13 and the main valve core 28 is discharged to normal pressure, close the needle valve 36, connect the replacement gas valve port 35 to the nitrogen pipeline of the loading and unloading column through the valve switching of the loading and unloading column, and replenish 0.6MPa pressure nitrogen into the outlet valve core 13 and the main valve core 28 through the replacement gas valve port 35. Close the needle valve 36, connect the replacement gas valve port 35 to the high-altitude exhaust pipeline of the loading and unloading column through the valve switching of the loading and unloading column, open the needle valve 36, discharge the gas in the outlet valve core 13 and the main valve core 28, and repeat the above operation to replenish nitrogen twice to complete the nitrogen replacement of the gas in the outlet valve core 13 and the main valve core 28.

[0070] After completing the gas replacement, hold the holding sleeve 16 with both hands and move it to the right. When the inner inclined surface on the left side of the holding sleeve 16 is directly above the claw 18, the spring force of the fifth elastic member 22 acts on the right end face of the claw supporting sleeve 14, prompting the claw supporting sleeve 14 to move to the left. The claw supporting sleeve 14 applies a left axial force to the male gun seat 1, and the inclined surface of the claw groove 42 of the male gun seat 1 applies an outward axial force to the claw 18. The claw 18 bounces up instantly, and the inner bottom surface of the claw 18 is supported on the outer wall surface of the claw supporting sleeve 14. At the same time, the outer arc surface of the claw 18 is tightly pressed against the inner inclined surface on the left side of the holding sleeve 16, and the left movement of the holding sleeve 16 is restricted by the claw 18. After the male gun holder 1 is disengaged from the gun head sleeve 12, the outer arc surface of the solid umbrella-shaped circular body of the outlet valve core 13 is in close contact with the O-ring 20 to achieve sealing. At this point, the male end 200 and the female end 300 are disconnected.

[0071] Figure 3 and Figure 4 The direction indicated by the arrow is the flow direction of the gas.

[0072] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0073] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0074] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A quick connector for a hydrogen tube bundle vehicle, comprising: A male end (200) comprising a male gun base (1), an air distribution valve (2) fixedly mounted in the male gun base, and a pilot valve (10) adapted to the air distribution valve; A female end (300) includes a female gun base (34), a gun head sleeve (12) connected to the front end of the female gun base, an outlet valve core (13) arranged in the gun head sleeve, and a main valve core (28) installed on the female gun base, the gun head sleeve is fixedly connected to the female gun base through a gun body (27), and the gun body is provided with a gas replacement channel (40), and the gas replacement channel is used to replace the gas in the female end; Wherein, in the first state, the pilot valve is closed to make the male end self-sealing, and the outlet valve core and the main valve core are closed to make the female end self-sealing, In the second state, the gun head sleeve is aligned with the male gun seat and fits in place, the outlet valve core fits in place with the end face of the pilot valve, and the gas replacement channel can be connected to the internal channel of the female end through the main valve core to perform gas replacement, and the pilot valve, the outlet valve core and the main valve core can all be opened to connect the internal channels of the male end and the female end, so that the quick connector can be opened under pressure. The first state and the second state can be switched, thereby completing the pressure connection and pressure disconnection between the male end and the female end. The pilot valve comprises a pilot valve seat (4) and a pilot valve core (101) adapted to be installed in the pilot valve seat, one end of the pilot valve seat is provided with an annular protrusion extending radially outward, and the pilot valve seat sleeve is provided with a second elastic member (6), both ends of the second elastic member respectively abut against the annular protrusion and an annular lip extending radially inward formed on the front end inner wall of the air separation valve, and under the action of the second elastic member, the annular protrusion abuts against the inclined surface formed on the inner wall of the male head gun seat to form a seal.

2. The quick connector according to claim 1, characterized in that: A stepped flow passage is provided inside the air separation valve, and a plurality of flow holes (201) evenly distributed in the circumferential direction are provided on the annular lip, wherein the flow holes penetrate the annular lip in the axial direction.

3. The quick connector according to claim 1, characterized in that: The pilot valve core includes a hollow tube inserted into the pilot valve seat and a valve head connected to the hollow tube. The valve head is provided with an inner conical surface, and the inner conical surface is connected to the hollow tube through a through hole extending in the axial direction. The inner conical surface is provided with a plurality of oblique holes penetrating the valve head. Wherein, a first elastic member (5) is provided between the pilot valve seat and the pilot valve core, a plurality of first through holes are uniformly distributed circumferentially on the hollow tube, and a plurality of second through holes are uniformly distributed circumferentially on the pilot valve seat. In a first state, the first through hole and the second through hole are staggered, so that the pilot valve is closed; In the second state, the pilot valve core can compress the first elastic member to connect the first through hole with the second through hole, thereby opening the replacement channel of the pilot valve, and can push the pilot valve seat to compress the second elastic member to disengage the annular protrusion from the inclined surface of the inner wall of the male gun seat, thereby connecting the inclined hole to open the loading and unloading channel of the pilot valve.

4. The quick connector according to claim 1, wherein: The outlet valve core is installed inside the gun head sleeve through the outlet valve core sleeve (15). The outlet valve core is constructed to include a hollow tube body and a solid umbrella-shaped circular body arranged at the axial inner end of the hollow tube body. A first oblique through-hole (131) and a second oblique through-hole (132) are respectively provided on both axial sides of the solid umbrella-shaped circular body. A third elastic member (23) is provided between the outlet valve core and the main valve core. In the first state, the solid umbrella-shaped round body abuts against the inclined surface formed in the outlet valve core sleeve under the action of the third elastic member to form a seal, thereby making the first oblique through-hole and the second oblique through-hole non-conductive. In the second state, the outlet valve core moves axially inward and compresses the third elastic member to separate the solid umbrella-shaped body from the inclined surface in the outlet valve core sleeve, thereby connecting the first oblique through-hole and the second oblique through-hole.

5. The quick connector according to claim 1, characterized in that: The main valve core is installed on the female gun seat through the main valve core seat (33), the main valve core seat is fixed in the female gun seat, and an annular space is formed between the main valve core seat and the female gun seat. The main valve core seat is constructed in a cylindrical shape with one end closed, and a plurality of through oblique holes (331) are provided at the closed end. A plurality of switch holes (332) are evenly distributed circumferentially on the side wall of the main valve core seat, and the through oblique holes are connected to the switch holes through the annular space.

6. The quick connector according to claim 5, characterized in that: A plurality of third through holes (281) are uniformly distributed circumferentially on the side wall of the main valve core near the axial inner end, and first energy storage sealing rings (31, 32) are respectively provided between the main valve core and the main valve core seat and on both axial sides of the switch hole. The main valve core is configured to enable the third through hole and the switch hole to be axially offset to close the main valve core, and to enable the main valve core to move axially relative to the main valve core seat to connect the third through hole and the switch hole accordingly, thereby opening the main valve core.

7. The quick connector according to claim 6, characterized in that: An annular boss is provided on the outer peripheral surface of the main valve core, and the annular boss is configured with transmission teeth (282) extending and distributed along the axial direction. A handle gear (41) adapted to the transmission teeth is provided in the inner wall of the gun body, and the main valve core can be driven to move axially by rotating the handle gear.

8. The quick connector according to claim 4, characterized in that: One end of the gas replacement channel is connected to the internal space of the gun body, and the other end forms a replacement gas valve port (35).

9. The quick connector according to claim 8, characterized in that: A fourth through hole (283) is provided on the side wall of the main valve core close to the axial outer end, and a second energy storage sealing ring (24) is provided between the main valve core and the outlet valve core sleeve. The main valve core can move the fourth through hole to the axial outside of the second energy storage sealing ring to close the fourth through hole, and can move the fourth through hole to the axial inside of the second energy storage sealing ring to connect the fourth through hole and the gas replacement channel.

10. The quick connector according to claim 1, characterized in that: A gripping sleeve (16) is sleeved on the outside of the gun head sleeve, and a fourth elastic member (21) is provided between the gripping sleeve and the gun head sleeve. The inner wall of the gripping sleeve is provided with a first limiting step, the outer wall of the gun head sleeve is provided with a second limiting step, and both ends of the fourth elastic member respectively abut against the first limiting step and the second limiting step.

11. The quick connector according to claim 10, characterized in that: The gun head sleeve is provided with a plurality of mounting holes evenly distributed in the circumference, wherein claws (18) are respectively installed in the mounting holes, a claw supporting sleeve (14) is provided between the gun head sleeve and the outlet valve core sleeve, a fifth elastic member (22) is provided between the claw supporting sleeve and the axial direction of the gun body, and a claw groove (42) is provided on the outer wall of the male gun seat near the front end. In the first state, the claw supporting sleeve supports the claw under the action of the fifth elastic member, so that the claw forms an axial restriction on the holding sleeve. In the second state, the male gun mount pushes the claw support slide to move axially and compresses the fifth elastic member until the claws fall into the claw grooves respectively, so that the male gun mount and the gun head sleeve are locked to form a self-sealing.

12. The quick connector according to claim 11, characterized in that: The holding sleeve is configured to generate axial movement by applying a force in the second state, and the claw is configured to automatically pop up from the claw groove when the holding sleeve moves to the point where its inner wall surface leaves the mounting hole, thereby resetting the multiple claws and re-limiting the holding sleeve, thereby causing the male end and the female end to form self-seals at the same time to complete the disconnection and self-sealing.

13. The quick connector according to claim 5, characterized in that: The male gun base is provided with a first leakage detection hole (37) for real-time detection of failure leakage of a first sealing member (3) installed between the male gun base and the air separation valve. A second leakage detection hole (38) is provided on the side wall of the gun body near the middle position, for real-time detection of failure leakage of a second sealing member (26) installed between the gun body and the main valve core. A third leakage detection hole (39) is provided on the side wall of the gun body near the rear end, for real-time detection of failure leakage of a third sealing member (30) installed between the female gun seat and the main valve core seat.

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