Single-acting type hydrogenation gun
By improving the design of the valve core assembly and housing structure, the single-acting hydrogen refueling gun solves the problems of connection convenience and safety, achieving convenient connection and safety for high-frequency use.
Patent Information
- Application Number
- CN202511685142.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-02-13
AI Technical Summary
Existing single-acting hydrogen refueling nozzles are inadequate in terms of connection convenience and safety, making it difficult to meet the growing demand for hydrogen refueling services.
The design employs a valve core assembly and housing structure, including components such as the valve core, retaining sleeve, pawl, and compression spring. The hydrogen dispensing head is locked and unlocked through insertion and removal actions, ensuring the unidirectional and safe flow of hydrogen.
The hydrogen refueling gun has achieved a simple structure, convenient connection, and high safety and reliability, meeting the requirements of high-frequency use.
Smart Images
Figure CN121520519A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydrogen refueling equipment technology, specifically to a hydrogen refueling gun. Background Technology
[0002] The hydrogen refueling nozzle is the core tool connecting a hydrogen fuel cell vehicle to the hydrogen refueling machine. Its main function is to safely and efficiently deliver high-pressure hydrogen to the onboard hydrogen storage tank. A single-acting hydrogen refueling nozzle uses a one-way valve to control the flow of hydrogen, allowing only hydrogen to flow from the refueling machine to the vehicle's hydrogen storage tank, effectively preventing leaks. It connects to the refueling port with a quick-plug design for a sealed connection.
[0003] With the rapid development of hydrogen fuel cell vehicles, the requirements for hydrogen refueling stations are also becoming increasingly stringent. The increasing number of hydrogen refueling trips places higher demands on the convenience and safety of hydrogen refueling nozzles. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a single-acting hydrogen refueling gun with a simple and ingenious structure, convenient connection, reliability, and high safety.
[0005] To solve the above problems, the technical solution adopted by the present invention is: a single-acting hydrogen refueling gun, comprising: a valve body, a valve cavity provided within the valve body, a valve cavity inlet provided at the bottom of the valve body, a shell sleeve fitted onto the valve body, a valve core assembly provided within the shell sleeve, the valve core assembly including a valve core, the valve core including: a valve core body, a valve core head at the lower end of the valve core body, a hollow valve core body forming a valve core channel, a valve core outlet connected to the valve core channel at the top port of the valve core body, a valve core inlet connected to the valve core channel on the valve core body above the valve core head, and a valve core retaining part provided at the valve core head. The valve core head is located in the valve seat. A retaining sleeve is fitted on the valve core body above the valve seat. The retaining sleeve and the valve core are locked together and do not move relative to each other in the axial direction. The valve seat is supported on the top of the valve body. A first compression spring is provided between the retaining sleeve and the valve seat. A valve seat locking part is provided on the inner wall of the valve seat. Under the elastic force of the first compression spring, the valve core locking part is locked on the valve seat locking part, thereby isolating the valve core inlet from the valve cavity. A first sealing mechanism is provided between the inner wall of the valve seat and the valve core head. The valve core assembly inside the housing is fitted with a valve sleeve. The lower end of the valve sleeve is fixed to the valve body. The valve sleeve locks and fixes the valve seat on the valve body. A second compression spring is provided between the housing and the valve body. Under the action of the second compression spring, the upper end of the housing presses against the limiting component on the outer wall of the valve sleeve. At least two mounting through holes are provided at intervals along the circumference of the valve sleeve, and a movably mounted claw is provided in each mounting through hole. Each chuck structure includes: a chuck body, with a chuck protrusion on the top side of the chuck body near the housing; an installation cavity between the housing and valve sleeve on the outer side of each chuck, with a chuck block inside each installation cavity; a chuck block with a stop protrusion protruding towards the chuck on the outer wall of the side of each chuck block near the chuck, a chuck block groove recessed towards the housing on the outer wall of the chuck block at the top of the stop protrusion, and an inwardly recessed clearance groove on the outer wall of the chuck block at the bottom of the stop protrusion; a third compression spring between the bottom of the chuck block and the bottom of the installation cavity, under the action of the third compression spring, the chuck block always has an upward tendency; and a housing slot on the housing at the top of the installation cavity. In the initial state, the retaining sleeve is stuck on one side of the mounting through hole, the valve core inlet is separated from the valve cavity, the claw protrusion of each claw is located in the retaining groove on the top of the retaining block, the retaining protrusion is stuck at the bottom of the claw protrusion, and there is a gap between the top of the retaining block and the top of the corresponding mounting cavity. When the external hydrogen charging head is inserted into the valve sleeve, it presses against the sleeve and moves towards the valve seat until the hydrogen charging head groove on the outer wall of the hydrogen charging head is located outside the claw. Under the elastic force of the third compression spring, the locking block moves upward and drives the top of the claw to rotate towards the hydrogen charging head. When the locking block moves to press against the top of the mounting cavity, the claw locks in the hydrogen charging head groove, thus locking the hydrogen charging head. The locking protrusion is locked outside the claw protrusion. In this state, the hydrogen charging head is sealed to the valve core outlet, and the valve cavity is connected to the valve core channel. After hydrogenation is completed, press the shell sleeve to move the locking block closer to the valve body. The locking protrusion on the locking block disengages from the claw protrusion, and the locking groove is located outside the claw. The locking protrusion and the lower end of the claw are connected. The contact between the parts drives the top of the pawl to rotate towards the locking groove. When the housing groove locks onto the top of the pawl protrusion and the locking protrusion locks onto the lower end of the outer wall of the pawl, the pawl completely disengages from the hydrogen head locking groove, thereby unlocking the hydrogen head and disengaging it from the valve core outlet. Under the elastic force of the first compression spring, the retaining sleeve returns to its initial position on the side of the mounting through hole. Under the action of the second compression spring, the housing returns to its initial state of pressing against the limiting component on the outer wall of the valve sleeve. Under the action of the third compression spring, the locking block returns to its initial state where the locking protrusion locks onto the bottom of the pawl protrusion, and each pawl returns to its initial state where the pawl protrusion is located in the locking groove on the top of the locking block.
[0006] Furthermore, in the aforementioned single-acting hydrogen refueling gun, the bushing adopts a split structure, comprising an inner bushing and an outer bushing, the inner bushing having a bushing protrusion and the outer bushing having a bushing groove. The bushing protrusion of the inner bushing is engaged in the bushing groove of the outer bushing, thereby achieving axial synchronous movement; a shaft retaining ring is provided on the outer wall of the upper end of the valve core body, and the inner bushing is engaged in the shaft retaining ring.
[0007] Furthermore, in the aforementioned single-acting hydrogen refueling gun, the first sealing mechanism includes a first sealing groove disposed on the inner wall of the valve seat, a first sealing ring disposed in the first sealing groove, and the valve seat and the valve core head are sealed together by the first sealing ring.
[0008] Furthermore, in the aforementioned single-acting hydrogen refueling gun, the valve body and the valve seat are sealed together, the valve seat extends into the valve cavity of the valve body, a second sealing groove is provided on the inner wall of the upper end of the valve cavity, a second sealing ring is provided in the second sealing groove, and the valve body and the valve seat are sealed together by the second sealing ring.
[0009] Furthermore, in the aforementioned single-acting hydrogen refueling gun, an anti-detachment mechanism is provided between the valve body and the housing. The anti-detachment mechanism includes: a retaining ring fitted inside the housing at the lower end of the valve body; a bottom groove on the inner wall of the lower end of the housing outside the retaining ring; a connecting through hole on the valve body inside the retaining ring; the inner end of the connecting through hole communicating with the valve cavity; a connecting through hole retaining step at the inner end of the connecting through hole; a connecting sleeve fixedly installed in the connecting through hole; and a push rod movably installed inside the connecting sleeve. The outer wall of the inner end of the push rod seals against the inner wall of the connecting hole. The outer end of the rod contacts the connecting sleeve. A spring mounting hole is provided on the valve body at the radial position of the push rod. A fourth compression spring and a spring seat are provided in the spring mounting hole. The spring seat can move in the spring seat mounting hole. In the initial state, under the action of the fourth compression spring, the spring seat presses against the retaining ring, and the inner end of the push rod is blocked by the connecting through hole step. The retaining ring and the valve body are coaxial. In the hydrogenation state, the pressure in the valve cavity increases, which will drive the push rod to push the retaining ring to shift radially and block it in the bottom groove on the shell, thereby preventing the shell from moving axially in the hydrogenation state.
[0010] Furthermore, in the aforementioned single-acting hydrogen refueling gun, the mounting structure of the second compression spring between the housing and the valve body includes: a second spring seat fixedly disposed on the valve body above the retaining ring, and a second compression spring retaining step disposed on the inner wall of the housing, wherein the upper and lower ends of the second compression spring are respectively pressed against the second compression spring retaining step and the second spring seat.
[0011] The advantages of this invention are: This application provides a single-acting hydrogen refueling gun, which has a simple structure, is easy to plug and unplug from the hydrogen refueling head, and is safe and reliable. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of a single-acting hydrogen refueling gun in its initial state according to the present invention.
[0013] Figure 2 This is a schematic diagram of a single-acting hydrogen refueling gun in the hydrogen refueling state according to the present invention.
[0014] Figure 3This is a schematic diagram of a single-acting hydrogen refueling gun in the hydrogen refueling state according to the present invention.
[0015] Figure 4 This is a cross-sectional structural diagram of the anti-detachment mechanism between the valve body and the casing. Detailed Implementation
[0016] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.
[0017] like Figure 1 , Figure 2 , Figure 3 As shown, a single-acting hydrogen refueling gun includes: a valve body 1, a valve cavity 101 inside the valve body 1, a valve cavity inlet 102 at the bottom of the valve body 1, a shell 2 fitted on the valve body 1, a valve core assembly inside the shell 2, the valve core assembly including a valve core 3, the valve core 3 including: a valve core body 31, a valve core head 32 at the lower end of the valve core body 31, a valve core channel 33 formed by the hollow valve core body 31, a valve core outlet 34 connected to the valve core channel 33 at the top port of the valve core body 31, a valve core inlet 35 connected to the valve core channel 33 on the valve core body 31 above the valve core head 32, a valve core retaining part 321 on the outer wall of the valve core head 32, the valve core head 32 being located in a valve seat 4, a retaining sleeve 5 fitted on the valve core body 31 above the valve seat 4, the retaining sleeve 5 and the valve core 3 being mutually retained and not subject to relative displacement in the axial direction. The valve seat 4 is supported on the top of the valve body 1. A first compression spring 6 is provided between the retaining sleeve 5 and the valve seat 4. A valve seat retaining part 41 is provided on the inner wall of the valve seat 4. Under the elastic force of the first compression spring 6, the valve core retaining part 321 is retained on the valve seat retaining part 41, thereby separating the valve core inlet 35 from the valve cavity 101. A first sealing mechanism is provided between the inner wall of the valve seat 4 and the valve core head 32.
[0018] In this embodiment, the first sealing mechanism includes a first sealing groove 42 disposed on the inner wall of the valve seat 4, and a first sealing ring 421 disposed in the first sealing groove 42. The valve seat 4 and the valve core head 32 are sealed together by the first sealing ring 421.
[0019] In this embodiment, the valve body 1 and the valve seat 4 are sealed to each other. The valve seat 4 extends into the valve cavity 101 of the valve body 1. A second sealing groove 103 is provided on the inner wall of the upper end of the valve cavity 101. A second sealing ring 104 is provided in the second sealing groove 103. The valve body 1 and the valve seat 4 are sealed to each other through the second sealing ring 104.
[0020] For ease of installation, in this embodiment, the retaining sleeve 5 adopts a split structure. The retaining sleeve 5 includes an inner retaining sleeve 51 and an outer retaining sleeve 52. The inner retaining sleeve 51 is provided with a retaining sleeve protrusion 511, and the outer retaining sleeve 52 is provided with a retaining sleeve groove 521. The retaining sleeve protrusion 511 of the inner retaining sleeve 51 is engaged in the retaining sleeve groove 521 of the outer retaining sleeve 52. A first shaft retaining ring 36 is provided on the outer wall of the upper end of the valve core body 31, and the inner retaining sleeve 51 is engaged in the first shaft retaining ring 36.
[0021] A valve core assembly inside the housing 2 is fitted with a valve sleeve 7. The lower end of the valve sleeve 7 is fixed to the valve body 1, and the valve sleeve 7 secures the valve seat 4 to the valve body 1. A second compression spring 21 is provided between the housing 2 and the valve body 1. Under the action of the second compression spring 21, the upper end of the housing 2 presses against the limiting component on the outer wall of the valve sleeve 7. In this embodiment, the installation structure of the second compression spring 21 between the housing 2 and the valve body 1 includes: a second spring seat 22 is fixedly provided on the outside of the valve body 1, and a second compression spring retaining step 23 is provided on the inner wall of the housing 2. The upper and lower ends of the second compression spring 21 respectively press against the second compression spring retaining step 23 and the second spring seat 22. In this embodiment, the limiting component on the outer wall of the valve sleeve 7 is a second shaft retaining ring 71 provided on the outer wall of the valve sleeve. Under the action of the second compression spring 21, the inner wall of the upper end of the housing 1 is engaged with the second shaft retaining ring 71.
[0022] At least two mounting through holes 72 are provided at intervals along the circumference of the valve sleeve 7. A movably mounted claw 8 is provided in each mounting through hole 72. A claw protrusion 81 is provided on the top of each claw 8 near the shell 2. An mounting cavity 70 is provided between the shell 2 and the valve sleeve 7 on the outer side of each claw 8. A locking block 9 is provided in each mounting cavity 70. A locking protrusion 91 protruding towards the claw 8 is provided on the outer wall of each locking block 9 near the claw 8. A locking groove 92 recessed towards the shell 2 is provided on the outer wall of the locking block 9 at the top of the locking protrusion 91. An inwardly recessed relief groove 93 is provided on the outer wall of the locking block 9 at the bottom of the locking protrusion 91. A third compression spring 73 is provided between the bottom of the locking block 9 and the valve sleeve 7. Under the action of the third compression spring 73, the locking block 9 always has an upward tendency to move. A shell retaining groove 24 is provided on the shell 2 at the top of the mounting cavity 70.
[0023] To improve the safety of hydrogenation, an anti-detachment mechanism is provided between the valve body 1 and the housing 2. The anti-detachment mechanism includes: a retaining ring 12 fitted inside the housing 2 at the lower end of the valve body 1; a bottom groove 25 on the inner wall of the lower end of the housing 2 outside the retaining ring 12; a connecting through hole 103 on the valve body 1 inside the retaining ring 12; the inner end of the connecting through hole 103 connecting to the valve cavity 101; and a connecting through hole blocking step 104 at the inner end of the connecting through hole 103. A connecting sleeve 105 is fixedly installed in the through hole 103. A push rod 106 is movably installed inside the connecting sleeve 105. The outer wall of the inner end of the push rod 106 is sealed with the inner wall of the connecting hole 103. The outer end of the push rod 106 is in contact with the retaining ring 12. A spring mounting hole 107 is provided on the valve body 1 at the radial position of the push rod 106. A fourth compression spring 108 and a spring seat 109 are provided in the spring mounting hole 107. The spring seat 109 can move in the spring seat mounting hole 107.
[0024] In the initial state, such as Figure 1 As shown, the retaining sleeve 5 is locked on the outside of the mounting through hole 72, the valve core inlet 35 is separated from the valve cavity 101, the retaining protrusion 81 of each claw 8 is located in the retaining groove 92 on the top of the retaining block 9, and the retaining protrusion 91 is locked at the bottom of the claw protrusion 81. There is a gap between the top of the retaining block 9 and the top of the corresponding mounting cavity 70. Under the action of the fourth compression spring 108, the spring seat 109 is pressed against the retaining ring 12, and the inner end of the push rod 106 is locked by the connecting through hole retaining step 105. The retaining ring 12 is coaxial with the valve body 1.
[0025] When the external hydrogenation head 10 is inserted into the valve sleeve 7, pressing against the retaining sleeve 5, it drives the valve core 3 to move towards the valve seat 4. When the hydrogenation head groove 11 on the outer wall of the hydrogenation head 10 is located outside the claw 8, the locking block 9 moves upward under the elastic force of the third compression spring 73 and drives the top of the claw 8 to rotate towards the hydrogenation head 10. When the locking block 9 moves to press against the top of the mounting cavity 70, the claw 8 is locked in the hydrogenation head groove 11, so that the hydrogenation head 10 is locked, and the locking protrusion 91 is locked outside the claw protrusion 81 of the claw 8. In this state, the hydrogenation head 10 is sealed and connected to the valve core outlet 34, the valve core locking part 321 is disengaged from the valve seat locking part 41, and the valve cavity 101 is connected to the valve core channel 33, that is, it is in the hydrogenation state. Under hydrogenation conditions, the increased pressure inside valve chamber 101 will drive push rod 106 to push retaining ring 12 radially, causing it to lock in the bottom groove 25 of housing 2, thereby preventing axial movement of housing 2 under hydrogenation conditions. See [link to relevant documentation]. Figure 2 As shown.
[0026] After hydrogenation is completed, the pressure inside the valve chamber 101 decreases. Under the action of the fourth compression spring 108, the spring seat 108 drives the retaining ring 12 to move radially until it drives the push rod 106 back to the position where it is locked on the locking step 104 of the connecting through hole. The retaining ring 12 is coaxial with the valve body 1, so that the retaining ring 12 is disengaged from the bottom locking groove 25 on the housing 2. At this time, pressing the housing 2 causes the locking block 9 to move closer to the valve body 1. The locking protrusion 91 on the locking block 9 disengages from the locking claw protrusion 81, and the locking groove 92 is located outside the locking claw 8. The locking protrusion 91 contacts the lower end of the locking claw 8, driving the top of the locking claw 8 to rotate towards the locking groove 92. When the housing locking groove 24 locks on the top of the locking claw protrusion 31 and the locking protrusion 91 locks on the outer wall of the lower end of the locking claw 8, the locking claw 8 is completely disengaged from the hydrogenation head locking groove 11, thereby unlocking the hydrogenation head 10 and allowing it to engage with the valve core. When the outlet 34 disengages, under the elastic force of the first compression spring 6, the retaining sleeve 5 returns to its initial position where it is blocked outside the mounting through hole 72. Under the action of the second compression spring 21, the housing 2 returns to its initial state where it is pressed against the second shaft retaining ring 71 on the outer wall of the valve sleeve 7. Under the action of the third compression spring 73, the locking block 9 returns to its initial state where the locking protrusion 91 is blocked at the bottom of the locking claw protrusion 81, and each claw 8 returns to its initial state where the locking claw protrusion 81 is located in the locking groove 92 on the top of the locking block 9.
[0027] As can be seen from the above, this application provides a single-acting hydrogen refueling gun, which has a simple structure, is easy to insert and remove from the hydrogen refueling head, and is safe and reliable.
Claims
1. A single-acting hydrogen refueling gun, comprising: The valve body contains a valve cavity, with a valve cavity inlet at the bottom. A sleeve is fitted onto the valve body. The characteristic feature is that a valve core assembly is housed within the sleeve. The valve core assembly includes a valve core, which comprises: a valve core body, a valve core head at its lower end, a hollow valve core body forming a valve core channel, a valve core outlet at its top end communicating with the valve core channel, a valve core inlet communicating with the valve core channel on the valve core body above the valve core head, a valve core retaining part at the valve core head, and the valve core head located within a valve seat. A retaining sleeve is fitted onto the valve core body. The retaining sleeve and the valve core are locked together and do not move relative to each other in the axial direction. The valve seat is supported on the top of the valve body. A first compression spring is provided between the retaining sleeve and the valve seat. A valve seat locking part is provided on the inner wall of the valve seat. Under the elastic force of the first compression spring, the valve core locking part is locked onto the valve seat locking part, thereby isolating the valve core inlet from the valve cavity. A first sealing mechanism is provided between the inner wall of the valve seat and the valve core head. A valve sleeve is fitted onto the valve core assembly inside the housing. The lower end of the valve sleeve is fixed to the valve body. The valve sleeve locks and fixes the valve seat onto the valve body. A second compression spring is provided between the housing and the valve body. Under the action of the second compression spring, the upper end of the housing presses against the limiting component on the outer wall of the valve sleeve. At least two mounting through holes are provided at intervals along the circumference of the valve sleeve, and a movably mounted claw is provided in each mounting through hole. Each chuck structure includes: a chuck body, with a chuck protrusion on the top side of the chuck body near the housing; an installation cavity between the housing and valve sleeve on the outer side of each chuck, with a chuck block inside each installation cavity; a chuck block with a stop protrusion protruding towards the chuck on the outer wall of the side of each chuck block near the chuck, a chuck block groove recessed towards the housing on the outer wall of the chuck block at the top of the stop protrusion, and an inwardly recessed clearance groove on the outer wall of the chuck block at the bottom of the stop protrusion; a third compression spring between the bottom of the chuck block and the bottom of the installation cavity, under the action of the third compression spring, the chuck block always has an upward tendency; and a housing slot on the housing at the top of the installation cavity. In the initial state, the retaining sleeve is stuck on one side of the mounting through hole, the valve core inlet is separated from the valve cavity, the claw protrusion of each claw is located in the retaining groove on the top of the retaining block, the retaining protrusion is stuck at the bottom of the claw protrusion, and there is a gap between the top of the retaining block and the top of the corresponding mounting cavity. When the external hydrogen charging head is inserted into the valve sleeve, it presses against the sleeve and moves towards the valve seat until the hydrogen charging head groove on the outer wall of the hydrogen charging head is located outside the claw. Under the elastic force of the third compression spring, the locking block moves upward and drives the top of the claw to rotate towards the hydrogen charging head. When the locking block moves to press against the top of the mounting cavity, the claw locks in the hydrogen charging head groove, thus locking the hydrogen charging head. The locking protrusion is locked outside the claw protrusion. In this state, the hydrogen charging head is sealed to the valve core outlet, and the valve cavity is connected to the valve core channel. After hydrogenation is completed, press the shell sleeve to move the locking block closer to the valve body. The locking protrusion on the locking block disengages from the claw protrusion, and the locking groove is located outside the claw. The locking protrusion and the lower end of the claw are connected. The contact between the parts drives the top of the pawl to rotate towards the pawl groove. When the housing groove is engaged with the top of the pawl protrusion and the pawl protrusion engages with the lower end of the pawl's outer wall, the pawl completely disengages from the hydrogen head pawl groove, thus unlocking the hydrogen head and allowing it to disengage from the valve core outlet. Under the elastic force of the first compression spring, the retaining sleeve returns to its initial position where it is engaged on the side of the mounting through hole. Under the action of the second compression spring, the housing returns to its initial state of pressing against the limiting component on the outer wall of the valve sleeve. Under the action of the third compression spring, the block returns to its initial state where the pawl protrusion engages with the bottom of the pawl protrusion, and each pawl returns to its initial state where the pawl protrusion is engaged in the pawl groove on the top of the block.
2. The single-acting hydrogen refueling gun according to claim 1, characterized in that: The retaining sleeve adopts a split structure, which includes an inner retaining sleeve and an outer retaining sleeve. The inner retaining sleeve is provided with a retaining sleeve protrusion, and the outer retaining sleeve is provided with a retaining sleeve groove. The retaining sleeve protrusion of the inner retaining sleeve is engaged in the retaining sleeve groove of the outer retaining sleeve, thereby realizing axial synchronous movement. A shaft retaining ring is provided on the outer wall of the upper end of the valve core body, and the inner retaining sleeve is engaged in the shaft retaining ring.
3. A single-acting hydrogen refueling gun according to claim 1, characterized in that: The first sealing mechanism includes a first sealing groove provided on the inner wall of the valve seat, and a first sealing ring provided in the first sealing groove, and the valve seat and the valve core head are sealed together by the first sealing ring.
4. A single-acting hydrogen refueling gun according to claim 1, characterized in that: The valve body and valve seat are sealed together. The valve seat extends into the valve cavity of the valve body. A second sealing groove is provided on the inner wall of the upper end of the valve cavity. A second sealing ring is provided in the second sealing groove. The valve body and valve seat are sealed together by the second sealing ring.
5. A single-acting hydrogen refueling gun according to claim 1, characterized in that: An anti-detachment mechanism is provided between the valve body and the housing. The structure of the anti-detachment mechanism includes: a retaining ring fitted inside the housing at the lower end of the valve body; a bottom groove provided on the inner wall of the lower end of the housing outside the retaining ring; a connecting through hole provided on the valve body inside the retaining ring; the inner end of the connecting through hole communicating with the valve cavity; a connecting through hole blocking step provided at the inner end of the connecting through hole; a connecting sleeve fixedly installed in the connecting through hole; a push rod movably installed inside the connecting sleeve; the outer wall of the inner end of the push rod sealing with the inner wall of the connecting hole; and the outer end of the push rod connecting with the connecting sleeve. The valve body has a spring mounting hole on the radial position of the push rod. A fourth compression spring and a spring seat are installed in the spring mounting hole. The spring seat can move in the spring seat mounting hole. In the initial state, under the action of the fourth compression spring, the spring seat is pressed against the retaining ring, and the inner end of the push rod is blocked by the connecting through hole and the retaining ring is coaxial with the valve body. In the hydrogenation state, the pressure in the valve cavity increases, which will drive the push rod to push the retaining ring to shift radially and block it in the bottom groove on the shell, thereby preventing the shell from moving axially in the hydrogenation state.
6. A single-acting hydrogen refueling gun according to claim 5, characterized in that: The mounting structure of the second compression spring between the housing and the valve body includes: a second spring seat is fixedly installed on the valve body above the retaining ring, and a second compression spring retaining step is provided on the inner wall of the housing. The upper and lower ends of the second compression spring are respectively pressed against the second compression spring retaining step and the second spring seat.