A hydro- gun and method of using same

Abstract

The application provides a hydrogenation gun and a use method thereof. The hydrogenation gun comprises a valve body, a valve core arranged in the valve body and reciprocally moving along an axial direction of the valve body to switch an air intake and exhaust state of the hydrogenation gun, a rotating drum sleeved outside the valve body and axially rotating relative to the valve body, and a linkage assembly arranged on the valve body and simultaneously contacting the rotating drum and the valve core. The linkage assembly converts a rotating force of the rotating drum into a linear force for driving the valve core to move along the axial direction of the valve body. The rotating force of the rotating drum is converted into the linear force for pushing the valve core in a spiral sliding groove moving mode through a limiting piece. The moving distance of the limiting piece directly indicates the moving distance of the valve core in different air intake and exhaust states, and the moving distance of the valve core is not determined through a rotating angle of the rotating drum. Therefore, when the moving distance of the valve core in different states changes, the axial length of the sliding groove is adjusted to adapt to the change of the moving distance of the valve core without complex conversion.

Description

Technical Field

[0001] This invention relates to the field of hydrogen refueling equipment technology, and in particular to a hydrogen refueling gun and its method of use. Background Technology

[0002] Hydrogen energy, as a clean fuel, requires a hydrogen refueling gun for refueling. Chinese patent CN107654840B discloses a fractional hydrogen fuel cell vehicle refueling gun, including a fractional linkage mechanism and a switching valve mechanism. The switching valve mechanism can be connected to the vehicle's hydrogen refueling port, and the fractional linkage mechanism is connected to the switching valve mechanism. The intake and exhaust states of the switching valve mechanism are controlled by the fractional linkage mechanism. The fractional linkage mechanism includes a camshaft. When the operating handle drives the camshaft to rotate, it pushes the pin on the valve core, thereby driving the operating valve core to perform linear reciprocating motion.

[0003] The aforementioned hydrogen refueling gun essentially converts the torque of the camshaft into a thrust that drives the valve core to move back and forth. Therefore, the rotation angle of each indexing step is marked on the indexing linkage mechanism. Different camshaft rotation angles represent different intake and exhaust states of the switching valve mechanism. However, the proportional relationship between the camshaft rotation angle and the linear movement distance of the valve core needs to be converted through complex calculations. Figure 1 The above-mentioned hydrogen refueling gun uses a cam mechanism to move the valve core, as shown in the schematic diagram. Figure 1 As shown, assuming the solid line represents the cam 6 rotating at 0 degrees, the position of valve core 2 is a0; assuming the dashed line represents the cam 6 rotating at 45 degrees, the position of valve core 2 is a1; assuming the dotted line represents the cam 6 rotating at 90 degrees, the position of valve core 2 is a2; assuming the dashed circle represents the cam 6 rotating at 45 degrees, the position of valve core 2 is a3. It is evident that the first 45° rotation of cam 6 moves valve core 2 from a0 to a1, and the second 45° rotation moves valve core 2 from a1 to a2. Although cam 6 rotates the same angle twice, the distance valve core 2 moves is different. This suggests that the distances between a0, a1, a2, and a3 are not proportional. Therefore, if the same distance valve core movement is represented by the rotation angle of cam 6, the rotation angle of cam 6 will change when the size of cam 6 changes.

[0004] When the size of the hydrogen refueling nozzle increases or decreases according to demand, the movement distance of the valve core in each intake and exhaust state of the switching valve mechanism changes. Therefore, the size of the cam also needs to change accordingly. It is necessary to perform complicated calculations to determine how much angle the cam rotates to represent the intake and exhaust state of the valve core, which causes difficulties in the design and manufacturing of hydrogen refueling nozzles of different specifications. Summary of the Invention

[0005] Therefore, the application provides a hydrogenation gun and a use method thereof.

[0006] The technical scheme of the application is achieved as follows: the application provides a hydrogenation gun, which comprises a valve body, a valve core arranged in the valve body and moving along the axial direction of the valve body to switch the intake and exhaust states of the hydrogenation gun, a rotating drum sleeved outside the valve body and rotating relative to the valve body, and a linkage assembly arranged on the valve body and simultaneously contacting the rotating drum and the valve core, wherein the linkage assembly converts the rotating force of the rotating drum into a linear force for driving the valve core to move along the axial direction of the valve body.

[0007] Preferably, the linkage assembly comprises a sliding sleeve arranged on the valve body and located in the rotating drum, and a limiting piece fixed on the rotating drum and rotating synchronously with the rotating drum, wherein the sliding sleeve moves along the axial direction of the valve body and drives the valve core to move synchronously along the axial direction of the valve body, the outer wall of the sliding sleeve is provided with a sliding groove, the sliding groove is provided in a spiral shape around the axial direction of the valve body, one end of the limiting piece is fixed on the rotating drum and the other end is inserted into the sliding groove and moves along the sliding groove, and the limiting piece drives the sliding sleeve to move synchronously.

[0008] More preferably, a pulley is arranged on the end of the limiting piece inserted into the sliding groove, and the wheel surface of the pulley is in close contact with the inner wall of the sliding groove.

[0009] More preferably, the linkage assembly further comprises a pin fixed on the sliding sleeve and moving synchronously with the sliding sleeve, wherein at least one window groove is arranged on the peripheral wall of the valve body and extends along the axial direction of the valve body, one end of the pin is fixed on the sliding sleeve and the other end passes through the window groove and is clamped on the valve core, so that the sliding sleeve drives the valve core to move synchronously through the pin.

[0010] More preferably, the intake and exhaust states switched by the valve core include a gas source cutoff state, an exhaust passage connection state for discharging residual gas in the valve core, and a gas filling passage connection state for hydrogenation operation, wherein when the valve core is in the gas source cutoff state, the position of the limiting piece in the sliding groove is an initial position, when the valve core is switched to the exhaust passage connection state, the position of the limiting piece in the sliding groove is an intermediate position, and when the valve core is switched to the gas filling passage connection state, the position of the limiting piece in the sliding groove is a terminal position, and when the limiting piece moves between the intermediate position and the terminal position, the valve core is in a state that the exhaust passage is being closed and the gas filling passage is being connected or in a state that the gas filling passage is being closed and the exhaust passage is being connected.

[0011] Further preferably, the prompting mechanism is arranged in the sliding slot and located at the middle position; when the limiting piece moves through the middle position and contacts the prompting mechanism, the prompting mechanism reminds the operator to switch the valve core to the exhaust passage connection state.

[0012] Further preferably, the prompting mechanism comprises a ball and an elastic piece; a blind hole is arranged on the inner wall of the sliding slot and located at the middle position; the ball is arranged at the opening of the blind hole and part of the surface of the ball is located in the sliding slot; the elastic piece is arranged in the blind hole and the two ends of the elastic piece abut against the bottom of the blind hole and the surface of the ball in the blind hole respectively, and the elastic piece has the elastic compression and elastic return ability.

[0013] Further preferably, when the rotating drum rotates by 0° and 180° respectively, the limiting piece is located at the initial position and the terminal position respectively.

[0014] On the other hand, the application also provides a use method of the hydrogenation gun, which adopts the hydrogenation gun described above and comprises the following steps: step one, when the rotating angle of the rotating drum is zero, the limiting piece is located at the initial position and the valve core is in the gas source cut-off state; step two, the rotating drum is rotated to make the limiting piece move along the sliding slot and push the sliding sleeve to move along the valve body in the axial direction, when the rotating drum is rotated by 180° relative to the valve core, the limiting piece moves to the terminal position and makes the valve core switch to the gas filling passage connection state, and the hydrogenation gun is used for hydrogenation operation; step three, after the hydrogenation operation is completed, the rotating drum is reversely rotated, and when the rotating drum is rotated by zero degree relative to the valve core, the valve core is reset to the gas source cut-off state.

[0015] On the basis of the above technical scheme, preferably, during the process that the rotating drum is rotated by zero degree to 180° relative to the valve core, when the limiting piece moves to the middle position, the valve core switches to the exhaust passage connection state; during the process that the limiting piece moves from the middle position to the terminal position, the valve core is in the state that the exhaust passage is being closed and the gas filling passage is being connected; during the process that the rotating drum is reversely rotated by 180° to zero degree relative to the valve core, when the limiting piece moves to the middle position again, the valve core switches to the exhaust passage connection state and discharges the residual hydrogen in the valve core; during the process that the limiting piece moves from the middle position to the initial position, the valve core is in the state that the gas filling passage is being closed and the exhaust passage is being connected; when the limiting piece moves to the middle position, the limiting piece contacts the prompting mechanism, and the prompting mechanism reminds the operator to switch the valve core to the exhaust passage connection state.

[0016] The hydrogenation gun and the use method thereof have the following beneficial effects relative to the prior art:

[0017] (1) The rotating force of the rotating drum is converted into linear force to push the valve core through the limiting member in the spiral chute moving mode, the moving distance of the limiting member directly indicates the moving distance of the valve core in different air intake and exhaust states, and the moving distance of the valve core is determined by the rotating angle of the rotating drum, so when the moving distance of the valve core in each state changes, the change of the moving distance of the valve core can be re-adapted by adjusting the axial length of the chute without complex conversion, thereby greatly reducing the design and manufacturing difficulty of the hydrogenation gun.

[0018] (2) Since the hydrogenation gun valve core will make the internal pipeline of the hydrogenation gun in different air intake and exhaust states when moving to different positions, it is necessary to plug the vehicle hydrogenation port or judge the air intake and exhaust on-off condition according to different air intake and exhaust states, so it is necessary to prompt when the valve core moves to a certain intermediate position, the ball in the chute is pressed to contact the limiting member, thereby prompting the operator that the limiting member has moved to the intermediate position, so that the operator can judge that the valve core is switched to the air exhaust passage connection state. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a schematic diagram of the cam adjustment principle of the existing hydrogenation gun;

[0021] Figure 2 It is a perspective view of the hydrogenation gun of the present application;

[0022] Figure 3 It is a side view of the hydrogenation gun of the present application;

[0023] Figure 4 It is a partial perspective exploded view of the hydrogenation gun of the present application;

[0024] Figure 5 It is a partial side view of the hydrogenation gun of the present application;

[0025] Figure 6 It is a side view of the linkage assembly of the present application;

[0026] Figure 7 It is a side view of the sliding sleeve of the present application.

[0027] In the figure: 1, valve body; 101, window groove; 2, valve core; 3, rotating cylinder; 4, linkage assembly; 41, sliding sleeve; 42, limiting piece; 43, bolt; 401, sliding groove; 402, blind hole; 5, prompting mechanism; 51, ball; 52, elastic piece; 6, cam. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] As shown in combination with Figs. 1 and 2, a hydrogen filling gun according to the present application comprises a valve body 1, a valve core 2, a rotating cylinder 3 and a linkage assembly 4. Figure 1 Figure 2 Figure 3

[0030] The valve body 1 is essentially an inlet valve part of the existing hydrogen filling gun, and its two ends are connected with an outlet valve part and a flow guide valve part respectively. The outlet valve part is used to connect with the hydrogen filling port of a vehicle, and the flow guide valve part simultaneously connects the gas conveying pipe and the hydrogen recovery pipe of a gas source storage tank.

[0031] The valve core 2 is arranged in the valve body 1 and reciprocally moves along the axial direction of the valve body 1 to switch the inlet and outlet states of the hydrogen filling gun. When the hydrogen filling gun is connected with the hydrogen filling port, the valve core 2 will gradually retreat backward, and the valve core 2 will be in different inlet and outlet states when it retreats to different positions.

[0032] The rotating cylinder 3 is sleeved outside the valve body 1 and axially rotates relative to the valve body 1. A handle can be installed on the rotating cylinder 3 to facilitate the rotation of the rotating cylinder 3 by personnel. It should be noted that the rotating cylinder 3 actually has two functions. One is to convert the rotating force of the rotating cylinder 3 into a linear force to drive the valve core 2 to move along the axial direction of the valve body 1. The other is to lock the outlet valve part to lock the hydrogen filling pipe of the vehicle. For the second function, specifically, the outlet valve part is locked to the hydrogen filling pipe through three pawls which can be pivoted. An annular clamping groove is arranged on the outer circumferential wall of the connecting end of the hydrogen filling pipe. The pawl portions of the three pawls are simultaneously pivoted inward and clamped in the clamping groove to achieve the locking of the hydrogen filling pipe. However, the three pawls do not actively pivot to achieve the locking, but a sliding cylinder is sleeved outside the outlet valve part to cover the rear ends of the three pawls. At this time, the front ends of the pawls are pivoted outward. Meanwhile, the rotating cylinder 3 and the sliding cylinder are in contact through a wedge-shaped block. When the hydrogen filling pipe is inserted into the outlet valve part and the rotating cylinder 3 is rotated, the sliding cylinder is pushed forward by the wedge-shaped block. The sliding cylinder moves forward and covers the front ends of the three pawls, so that the front ends of the three pawls are pivoted inward and clamped in the clamping groove.

[0033] ​​​The linkage assembly 4 is arranged on the valve body 1 and simultaneously contacts the rotating drum 3 and the valve core 2; the linkage assembly 4 converts the rotating force of the rotating drum 3 into a linear force to drive the valve core 2 to move axially along the valve body 1. Since the rotating drum 3 rotates relative to the valve body 1, the principle of the embodiment is similar to that of a screw block mechanism, and the linear movement distance of the valve core 2 is controlled by the rotating angle of the rotating drum 3. Compared with the cam mechanism for driving the valve core 2 to move, even if the cam rotates by the same angle twice, the movement distance of the valve core 2 is not the same, which causes the rotating angle of the cam to need complex calculation to convert the movement distance of the valve core 2. In the embodiment, the movement distance of the valve core 2 driven by the rotating drum 3 is always the same when the rotating drum 3 rotates one circle each time, so even if the movement distance of the valve core 2 of different hydrogen lances changes, the change of the rotating angle or the rotating number of the rotating drum 3 can be quickly converted without corresponding adjustment of the rotating drum 3, so the design and manufacturing difficulty of the hydrogen lance is lower.

[0034] In Figure 4 In a preferred embodiment shown in the drawings, in order to achieve the purpose of converting the rotating force of the rotating drum 3 into a linear force to drive the valve core 2 to move axially along the valve body 1 by the linkage assembly 4, the linkage assembly 4 comprises a sliding sleeve 41 and a limiting piece 42.

[0035] The sliding sleeve 41 is arranged on the valve body 1 and located in the rotating drum 3. The sliding sleeve 41 moves axially along the valve body 1 and drives the valve core 2 to move synchronously along the valve body 1, and the outer wall of the sliding sleeve 41 is provided with a sliding groove 401, which is spirally arranged axially around the valve body 1. The sliding sleeve 41 only moves forward and backward along the valve body 1 and does not rotate, so the sliding sleeve 41 with the spiral sliding groove 401 on the outer wall is similar to the sliding block of the screw block mechanism, and the spiral sliding groove 401 is similar to the thread groove arranged on the sliding block for screwing with the screw.

[0036] The limiting piece 42 is fixedly arranged on the rotating drum 3 and rotates synchronously with the rotating drum 3, so the rotating drum 3 can be regarded as a screw of the screw block mechanism, and the limiting piece 42 is similar to the thread on the screw. One end of the limiting piece 42 is fixedly connected to the rotating drum 3 and the other end is inserted into the sliding groove 401 and moves along the sliding groove 401, and the sliding sleeve 41 drives the valve core 2 to move synchronously.

[0037] In Figure 4 In a preferred embodiment shown in the drawings, in order to make the limiting piece 42 move more smoothly in the sliding groove 401 and avoid jamming, a pulley is arranged on the end of the limiting piece 42 inserted into the sliding groove 401, and the wheel surface of the pulley tightly abuts against the inner wall of the sliding groove 401.

[0038] In Figure 5 In a preferred embodiment shown in the drawings, since the valve core 2 is sleeved in the valve body 1 and the sliding sleeve 41 is sleeved outside the valve body 1, in order to enable the sliding sleeve 41 to drive the valve core 2 to move synchronously forward and backward, the linkage assembly 4 further comprises a plug pin 43.

[0039] At least one window groove 101 is provided on the outer peripheral wall of the valve body 1, and the window groove 101 extends along the axial direction of the valve body 1. The window groove 101 provides space for the movement of the pin 43 and restricts the range of movement of the pin 43, which in turn restricts the range of movement of the valve core 2.

[0040] The pin 43 is fixed on the sliding sleeve 41 and moves synchronously with the sliding sleeve 41; one end of the pin 43 is fixed to the sliding sleeve 41 and the other end passes through the window groove 101 and is engaged with the valve core 2, so that the sliding sleeve 41 drives the valve core 2 to move synchronously through the pin 43.

[0041] exist Figure 3 In a preferred embodiment shown, the valve core 2 switches between the air intake and exhaust states, including the air source cut-off state, the exhaust passage connected state, and the gas filling passage connected state.

[0042] When the hydrogen refueling gun is in the gas source cut-off state, it is not connected to the hydrogen refueling port. At this time, the valve core 2 inside the hydrogen refueling gun is connected to the recovery pipe, and the connection between the valve core 2 and the hydrogen inlet pipe is closed, preventing hydrogen from entering the hydrogen refueling gun from the gas source. The hydrogen outlet end of the valve core 2 is also closed, and the entire hydrogen refueling gun is in a closed state. When the valve core 2 is in the gas source cut-off state, the position of the limiting member 42 within the slide groove 401 is the initial position.

[0043] When the hydrogen refueling gun is inserted into the hydrogen refueling port, the rotating drum 3 begins to rotate. Simultaneously, the valve core 2 moves backward due to the resistance from the hydrogen refueling port, opening the hydrogen outlet end of the valve core 2 and connecting it to the hydrogen refueling port. However, at this time, the inner end of the valve core 2 remains connected to the recovery pipe and is not connected to the gas supply pipe. Therefore, the valve core 2 is in the exhaust passage connected state; the hydrogen refueling gun is also in the exhaust passage connected state. When the valve core 2 switches to the exhaust passage connected state, the position of the limiting member 42 within the slide groove 401 is the middle position.

[0044] Continue rotating the drum 3 to make the valve core 2 continue to retract, so that the valve core 2 slowly disconnects from the recovery pipe and gradually connects to the gas supply pipe of the gas source; until the drum 3 rotates to the point that the valve core 2 is fully connected to the gas source and cuts off the recovery pipe, at which point the hydrogen refueling gun is in the gas refueling passage connected state to perform hydrogen refueling operation; when the valve core 2 switches to the gas refueling passage connected state, the position of the limiting member 42 in the slide groove 401 is the termination position.

[0045] After the hydrogenation operation is completed, the rotating drum 3 is rotated in the opposite direction to move the valve core 2 forward, so that the valve core 2 slowly reconnects the recovery pipe and gradually cuts off the gas supply pipe; until the rotating drum 3 rotates to the point that the valve core 2 is fully connected to the recovery pipe and cuts off the gas supply pipe, at which point the exhaust passage is connected again, so that the residual gas in the valve core 2 can be discharged to avoid the danger of combustion and explosion.

[0046] Rotating drum 3 rotates in the opposite direction to reset, and valve core 2 returns to the air supply cut-off state.

[0047] When the limiting member 42 moves between the intermediate position and the terminal position, the valve core 2 is in a state that the exhaust passage is being closed and the gas filling passage is being connected, or in a state that the gas filling passage is being closed and the exhaust passage is being connected.

[0048] In Figure 6 In a preferred embodiment shown in the figure, the rotation angle is usually marked on the existing hydrogen filling gun, so that the operator can determine the state of the valve core 2. Although the angle is marked in this embodiment, the distance that the valve core 2 needs to move when switching into the exhaust state is essentially the distance that the through hole on the outer peripheral wall of the two ends of the valve core 2 needs to move from the closed state to the connected state, and is not related to the length of the valve core 2. At the same time, the distance that the valve core 2 moves when the rotating barrel 3 rotates the same angle can always remain the same, so the valve core 2 may only rotate a small angle when switching from the gas source cut-off state to the exhaust passage connection state. Therefore, a mechanism that can more directly prompt the operator that the valve core 2 has switched states needs to be provided in the hydrogen filling gun, and the prompting mechanism 5 is also included.

[0049] The prompting mechanism 5 is arranged in the sliding groove 401 and located at the intermediate position. When the limiting member 42 moves through the intermediate position and makes the limiting member 42 contact the prompting mechanism 5, the prompting mechanism 5 reminds the operator that the valve core 2 has switched to the exhaust passage connection state. The prompting mechanism 5 can be a spring sheet that has pressure deformation and rebounding ability; or a sensor connected to an alarm, which will alarm as soon as the sensor contacts the limiting member 42.

[0050] In Figure 6 In a preferred embodiment shown in the figure, specifically, the prompting mechanism 5 includes a ball 51 and an elastic member 52.

[0051] The inner wall of the sliding groove 401 is provided with a blind hole 402, and the blind hole 402 is located at the intermediate position.

[0052] The ball 51 is arranged at the opening of the blind hole 402 and part of the surface of the ball 51 is located in the sliding groove 401.

[0053] The elastic member 52 is arranged in the blind hole 402, and the two ends of the elastic member 52 respectively abut against the bottom of the blind hole 402 and the surface of the ball 51 located in the blind hole 402. The elastic member 52 has elastic compression and rebounding reset ability, and the elastic member 52 can be a spring. Through the cooperation of the ball 51 and the elastic member 52, when the ball 51 contacts the limiting member 42, the ball 51 will be pressed downward into the blind hole 402, and the contact between the ball 51 and the limiting member 42 will bring a clear tactile prompt to the operator, and the ball 51 will not affect the normal movement of the limiting member 42.

[0054] In Figure 4In a preferred embodiment shown, when the rotating drum 3 rotates 0° and 180° respectively, the limiting member 42 is positioned at the initial position and the end position respectively.

[0055] like Figure 1 As shown, combined with Figures 2 to 7 A method for using a hydrogen refueling gun, employing any of the above embodiments, includes the following steps: Step 1, when the rotation angle of the rotating drum 3 is zero, the limiting member 42 is in the initial position, and the valve core 2 is in the gas source cut-off state; Step 2, rotating the rotating drum 3 causes the limiting member 42 to move along the slide groove 401 and push the slide sleeve 41 axially along the valve body 1. When the rotating drum 3 rotates 180 degrees relative to the valve core 2, the limiting member 42 moves to the termination position and switches the valve core 2 to the gas refueling passage connected state, and hydrogen refueling is performed using the hydrogen refueling gun; Step 3, after completing the hydrogen refueling operation, rotating the rotating drum 3 in the opposite direction. When the rotating drum 3 rotates to zero degrees relative to the valve core 2, the valve core 2 resets back to the gas source cut-off state.

[0056] exist Figure 7 In a preferred embodiment shown, during the process of the rotating drum 3 rotating relative to the valve core 2 from zero degrees to 180 degrees, when the limiting member 42 moves to the middle position, the valve core 2 switches to the exhaust passage connected state; during the process of the limiting member 42 moving from the middle position to the end position, the valve core 2 is in the state where the exhaust passage is closed and the gas filling passage is ready to be connected; during the process of the rotating drum 3 rotating relative to the valve core 2 in the opposite direction from 180 degrees to zero degrees, when the limiting member 42 moves to the middle position again, the valve core 2 switches to the exhaust passage connected state and discharges the residual hydrogen in the valve core 2; during the process of the limiting member 42 moving from the middle position to the initial position, the valve core 2 is in the state where the gas filling passage is closed and the exhaust passage is ready to be connected; when the limiting member 42 moves to the middle position, the limiting member 42 contacts the prompting mechanism 5, and the prompting mechanism 5 reminds the operator that the valve core 2 switches to the exhaust passage connected state.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrogenation gun characterized by, The valve body (1) is provided with a valve core (2) which moves axially along the valve body (1) to switch the inlet and exhaust states of the hydrogen charging gun, a rotating drum (3) which is sleeved outside the valve body (1) and rotates relative to the valve body (1), and a linkage assembly (4) which is provided on the valve body (1) and simultaneously contacts the rotating drum (3) and the valve core (2). The linkage assembly (4) converts the rotating force of the rotating drum (3) into a linear force to drive the valve core (2) to move axially along the valve body (1), and the linkage assembly (4) comprises a sliding sleeve (41) which is provided on the valve body (1) and located in the rotating drum (3), a limiting piece (42) which is fixed on the rotating drum (3) and rotates synchronously with the rotating drum (3), and a latch (43) which is fixed on the sliding sleeve (41) and moves synchronously with the sliding sleeve (41). The sliding sleeve (41) moves axially along the valve body (1) and drives the valve core (2) to move synchronously along the valve body (1), and the outer wall of the sliding sleeve (41) is provided with a sliding groove (401) which is spirally arranged axially around the valve body (1). One end of the limiting piece (42) is fixed on the rotating drum (3) and the other end is inserted into the sliding groove (401) and moves along the sliding groove (401), and the limiting piece (42) drives the sliding sleeve (41) and the valve core (2) to move synchronously, and the end of the limiting piece (42) inserted into the sliding groove (401) is provided with a pulley, and the wheel surface of the pulley is in close contact with the inner wall of the sliding groove (401). The outer peripheral wall of the valve body (1) is provided with at least one window groove (101) which extends axially along the valve body (1), and one end of the latch (43) is fixed on the sliding sleeve (41) and the other end passes through the window groove (101) and is clamped on the valve core (2), so that the sliding sleeve (41) drives the valve core (2) to move synchronously through the latch (43). The switching of the inlet and exhaust states of the valve core (2) includes a gas source cutoff state, an exhaust passage connection state for exhausting the residual gas in the valve core (2), and a gas filling passage connection state for hydrogen charging operation. When the valve core (2) is in the gas source cutoff state, the position of the limiting piece (42) in the sliding groove (401) is the initial position, when the valve core (2) is switched to the exhaust passage connection state, the position of the limiting piece (42) in the sliding groove (401) is the intermediate position, and when the valve core (2) is switched to the gas filling passage connection state, the position of the limiting piece (42) in the sliding groove (401) is the terminal position. The limiting piece (42) moves between the intermediate position and the terminal position, and the valve core (2) is in a state where the exhaust passage is being closed and the gas filling passage is being connected, or in a state where the gas filling passage is being closed and the exhaust passage is being connected. Further comprising a prompt mechanism (5) which is provided in the sliding groove (401) and located at the intermediate position. When the limiting piece (42) moves through the intermediate position and contacts the limiting piece (42) and the prompt mechanism (5), the prompt mechanism (5) reminds the operator that the valve core (2) is switched to the exhaust passage connection state. ​ ​ 2. A hydro- gun according to claim 1, characterized in that: ​ ​ ​ ​ ​ 3. A hydro- gun according to claim 2, characterized in that ​ ​ ​ 4. A hydro- gun according to claim 3, characterized in that: The prompting mechanism (5) comprises a ball (51) and an elastic member (52); The inner wall of the sliding groove (401) is provided with a blind hole (402), and the blind hole (402) is located at the middle position; The ball (51) is arranged at the opening of the blind hole (402) and part of the surface of the ball (51) is located in the sliding groove (401); The elastic member (52) is arranged in the blind hole (402), and the two ends of the elastic member (52) respectively abut against the bottom of the blind hole (402) and the surface of the ball (51) located in the blind hole (402), and the elastic member (52) has the elastic compression and rebound reset capability.

5. A hydro- gun according to claim 2, characterized in that: When the rotating drum (3) rotates 0° and 180° respectively, the limiting member (42) is located at the initial position and the terminal position respectively.

6. A method of using a hydrogenation lance according to any one of claims 2 to 5, characterized in that The method comprises the following steps: Step one, when the rotating drum (3) rotates 0°, the limiting member (42) is located at the initial position, and the valve core (2) is in the gas source cut-off state; Step two, rotate the rotating drum (3) to make the limiting member (42) move along the sliding groove (401) and push the sliding sleeve (41) to move axially along the valve body (1), when the rotating drum (3) rotates 180° relative to the valve core (2), the limiting member (42) moves to the terminal position and makes the valve core (2) switch to the gas inlet passage connection state, and the hydrogenation gun is used for hydrogenation operation; Step three, after the hydrogenation operation is completed, the rotating drum (3) is reversely rotated, and when the rotating drum (3) rotates 0° relative to the valve core (2), the valve core (2) is reset to the gas source cut-off state.

7. The method of using a hydro-gun of claim 6, wherein: During the process that the rotating drum (3) rotates from 0° to 180° relative to the valve core (2), when the limiting member (42) moves to the middle position, the valve core (2) switches to the exhaust passage connection state; During the process that the limiting member (42) moves from the middle position to the terminal position, the valve core (2) is in the state that the exhaust passage is being closed and the gas inlet passage is being connected; During the process that the rotating drum (3) reversely rotates from 180° to 0° relative to the valve core (2), when the limiting member (42) moves to the middle position again, the valve core (2) switches to the exhaust passage connection state and discharges the residual hydrogen in the valve core (2); During the process that the limiting member (42) moves from the middle position to the initial position, the valve core (2) is in the state that the gas inlet passage is being closed and the exhaust passage is being connected; When the limiting member (42) moves to the middle position, the limiting member (42) contacts the prompting mechanism (5), and the prompting mechanism (5) reminds the operator that the valve core (2) switches to the exhaust passage connection state.

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