Active pressure relief safety switch of LNG pneumatic liquid adding gun

Abstract

The invention relates to the technical field of pneumatic liquid adding guns, in particular to an LNG pneumatic liquid adding gun active pressure relief safety switch which comprises a liquid adding gun, a pneumatic adjusting mechanism is installed on the side wall of the liquid adding gun, a first adjusting mechanism and a second adjusting mechanism are installed in the pneumatic adjusting mechanism, and the liquid adding gun comprises a liquid adding gun body. A first air inlet hole, a second air inlet hole and a third air inlet hole are formed in the side wall of the liquid adding gun body, a first piston and a second piston are movably installed in the liquid adding gun body, the pneumatic adjusting mechanism comprises a shell, a first inner cavity and a second inner cavity are formed in the shell, and a compressed air connecting hole is formed in the side wall of the shell; a first connecting hole, a second connecting hole and a third connecting hole are formed in the back face of the shell, a through hole is formed between the first inner cavity and the second inner cavity, the first adjusting mechanism is installed in the first inner cavity, and the second adjusting mechanism is installed in the second inner cavity. The LNG pneumatic liquid adding gun provided by the invention is high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pneumatic liquid filling gun, in particular to a LNG pneumatic liquid filling gun active pressure relief safety switch. BACKGROUND

[0002] The LNG pneumatic liquid filling gun is a device for filling liquefied natural gas (LNG) cylinder, which adopts pneumatic control mode. The LNG pneumatic liquid filling gun usually uses instrument air as control gas source. When the button on the controller is pressed, the gas flows into the upper or lower cavity of the shell through the vent hole of the control plug, pushes the piston disc to move, thereby opening the valve, and the pawl rotates and locks the gas inlet under the action of the gas flow, and the filling of LNG begins. After filling is completed, the button is pressed again, the direction of the gas flow is changed, the piston disc is reset to close the valve, and the pawl is unlocked, so that the liquid filling gun can be pulled out.

[0003] The LNG pneumatic liquid filling gun needs to be locked before filling, which realizes stable filling of LNG gas by locking the LNG pneumatic liquid filling gun with the gas storage cylinder, thereby avoiding the problem that the LNG gas leaks due to separation of the liquid filling gun and the gas storage cylinder. SUMMARY

[0004] Therefore, the present application provides a LNG pneumatic liquid filling gun active pressure relief safety switch, which mainly solves the technical problem of providing a LNG pneumatic liquid filling gun with high safety.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a LNG pneumatic liquid filling gun active pressure relief safety switch, comprising a liquid filling gun, a pneumatic adjusting mechanism is installed on the side wall of the liquid filling gun, a first adjusting mechanism and a second adjusting mechanism are installed in the pneumatic adjusting mechanism, the liquid filling gun comprises a liquid filling gun body, a first air inlet hole, a second air inlet hole and a third air inlet hole are formed in the side wall of the liquid filling gun body, a first piston and a second piston are movably installed in the liquid filling gun body, the first air inlet hole is located above the first piston, the second air inlet hole is located between the first piston and the second piston, and the third air inlet hole is located below the second piston, the pneumatic adjusting mechanism comprises a shell, a first inner cavity and a second inner cavity are formed in the shell, a compressed air connecting hole is formed in the side wall of the shell, the compressed air connecting hole is in communication with the first inner cavity, a first connecting hole, a second connecting hole and a third connecting hole are formed in the back surface of the shell, the position of the first connecting hole corresponds to the position of the first air inlet hole, the position of the second connecting hole corresponds to the position of the second air inlet hole, and the position of the third connecting hole corresponds to the position of the third air inlet hole, a through hole is formed between the first inner cavity and the second inner cavity, the first adjusting mechanism is installed in the first inner cavity, and the second adjusting mechanism is installed in the second inner cavity.

[0006] By adopting the above technical solution, when in use, the compressed air pipeline is connected to the compressed air connection hole, and compressed air is introduced into the outer shell. Then, the positions of the first adjustment mechanism and the second adjustment mechanism are adjusted so that the compressed air can enter the body of the liquid gun from different air inlets, thereby controlling the movement of the first piston and the second piston, and thus realizing the operation of locking the gas storage bottle nozzle and adding gas to the gas storage bottle nozzle.

[0007] As a further description of the above technical solution:

[0008] A movable rod is fixedly connected to the bottom of the second piston. The bottom of the movable rod passes through the bottom of the liquid dispensing gun body to the lower part of the liquid dispensing gun body. A connecting nozzle is fixedly connected to the bottom of the movable rod.

[0009] By adopting the above technical solution, the gas cylinder can be filled with gas by inserting a connecting nozzle into the gas cylinder.

[0010] As a further description of the above technical solution:

[0011] The bottom of the liquid dispensing gun body is fixedly connected to a fixed post, the bottom of the fixed post is fixedly connected to a fixed sleeve, and the fixed sleeve is movably connected to a clamp, and there are multiple clamps.

[0012] By adopting the above technical solution, the liquid dispensing gun can be fixed on the nozzle of the gas storage bottle by the gripper, so that the liquid dispensing gun can be stably clamped on the gas storage bottle.

[0013] As a further description of the above technical solution:

[0014] The outer side of the fixing sleeve is fitted with a limiting sleeve, the outer surface of the connecting mouth is provided with a slot, the surface of the limiting sleeve is provided with a screw hole, a screw is installed inside the screw hole, and the end of the screw extends into the inside of the slot.

[0015] By adopting the above technical solution, the limiting sleeve can move up and down together with the connecting nozzle. When the limiting sleeve moves down, it will press down on the clamping claw on the fixing sleeve, so that the clamping claw is in a vertical state. The vertical clamping claw will clamp on the nozzle of the gas storage bottle, thereby fixing the liquid dispensing gun on the gas storage bottle.

[0016] As a further description of the above technical solution:

[0017] The first adjustment mechanism includes a first adjustment shaft, and a first sealing ring and a second sealing ring are fixedly connected to the surface of the first adjustment shaft, with the first sealing ring located above the second sealing ring.

[0018] By adopting the above technical solution, the positions of the first sealing ring and the second sealing ring can be changed by changing the position of the first adjusting shaft, thereby changing the communication state of the first connecting hole, the second connecting hole, the third connecting hole and the compressed air connecting hole.

[0019] As a further description of the above technical solution:

[0020] The second adjustment mechanism includes a second adjustment shaft, and a third sealing ring and a fourth sealing ring are fixedly connected to the surface of the second adjustment shaft, with the third sealing ring located above the fourth sealing ring.

[0021] By adopting the above technical solution, the positions of the third and fourth sealing rings can be changed by changing the position of the second adjusting shaft, thereby changing the communication state between the first connecting hole, the second connecting hole, the third connecting hole and the compressed air connecting hole.

[0022] As a further description of the above technical solution:

[0023] The bottom of the liquid dispensing gun is equipped with a gas storage bottle nozzle, and the gripper is located on the gas storage bottle nozzle.

[0024] By adopting the above technical solution, the liquid filling gun can be clamped and installed on the gas cylinder by the gripper, which facilitates stable gas filling.

[0025] By employing the above technical solution, the active pressure relief safety switch for an LNG pneumatic filling gun of the present invention has at least the following beneficial effects:

[0026] 1. Compared with the prior art, this LNG pneumatic dispensing gun active pressure relief safety switch, by setting multiple air inlets and a first piston and a second piston on the dispensing gun body, and in conjunction with the pneumatic adjustment mechanism, can control the entry path of compressed air and the movement state of the piston, so as to achieve the effect of locking the dispensing gun before dispensing, and avoid the situation of LNG gas leakage caused by the dispensing gun separating from the gas storage cylinder during the dispensing process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure proposed in this invention;

[0028] Figure 2 This is a first-view sectional view of the internal structure proposed in this invention;

[0029] Figure 3 This is a cross-sectional view of the internal structure from a second perspective, as proposed in this invention.

[0030] Figure 4 This is a side view of the liquid dispensing gun structure proposed in this invention;

[0031] Figure 5This is a third-view sectional view of the internal structure proposed in this invention;

[0032] Figure 6 This is a cross-sectional view of the internal structure from the fourth perspective proposed in this invention;

[0033] Figure 7 This is a fifth-perspective sectional view of the internal structure proposed in this invention;

[0034] Figure 8 This is a schematic diagram of the pneumatic adjustment mechanism proposed in this invention;

[0035] Figure 9 This is a schematic diagram of the first adjustment mechanism proposed in this invention;

[0036] Figure 10 This is a schematic diagram of the second adjustment mechanism proposed in this invention;

[0037] Figure 11 This is a schematic diagram of the internal structure proposed in this invention.

[0038] Legend:

[0039] 1. Liquid dispensing gun; 101. Liquid dispensing gun body; 102. First air inlet; 103. Second air inlet; 104. Third air inlet; 105. First piston; 106. Second piston; 107. Moving rod; 108. Connecting nozzle; 109. Fixing post; 110. Fixing sleeve; 111. Gripper; 112. Slot; 113. Limiting sleeve; 114. Screw hole; 2. Pneumatic adjustment mechanism; 201. Housing; 202. Compressed air connection hole; 203. First connecting hole; 204. Second connecting hole; 205. Third connecting hole; 206. Through hole; 3. First adjustment mechanism; 301. First adjustment shaft; 302. First sealing ring; 303. Second sealing ring; 4. Second adjustment mechanism; 401. Second adjustment shaft; 402. Third sealing ring; 403. Fourth sealing ring; 5. Gas storage bottle nozzle. Detailed Implementation

[0040] Reference Figures 1-11This invention provides an active pressure relief safety switch for an LNG pneumatic filling gun: It includes a filling gun 1, a pneumatic adjustment mechanism 2 installed on the side wall of the filling gun 1, and a first adjustment mechanism 3 and a second adjustment mechanism 4 installed inside the pneumatic adjustment mechanism 2. The filling gun 1 includes a filling gun body 101, and the side wall of the filling gun body 101 has a first air inlet 102, a second air inlet 103, and a third air inlet 104. A first piston 105 and a second piston 106 are movably installed inside the filling gun body 101. The first air inlet 102 is located above the first piston 105, the second air inlet 103 is located between the first piston 105 and the second piston 106, and the third air inlet 104 is located below the second piston 106. A movable rod 107 is fixedly connected to the bottom of the dispensing gun body 101. The bottom of the movable rod 107 passes through the bottom of the dispensing gun body 101 and extends to the underside of the dispensing gun body 101. A connecting nozzle 108 is fixedly connected to the bottom of the movable rod 107, which extends into the gas storage bottle to perform the gas filling operation. A fixing post 109 is fixedly connected to the bottom of the dispensing gun body 101. A fixing sleeve 110 is fixedly connected to the bottom of the fixing post 109. A clamping claw 111 is movably connected inside the fixing sleeve 110. There are multiple clamping claws 111. The clamping claws 111 can fix the dispensing gun 1 to the bottle mouth 5 of the gas storage bottle, so that the dispensing gun 1 can be stably clamped on the gas storage bottle. A limiting sleeve 113 is fitted on the outer side of the fixing sleeve 110. The outer surface of the connecting nozzle 108 is... The surface of the limiting sleeve 113 has a slot 112, and the surface of the limiting sleeve 113 has a screw hole 114. A screw (not shown) is installed inside the screw hole 114. The end of the screw extends into the slot 112, allowing the limiting sleeve 113 to move up and down with the connecting nozzle 108. When the limiting sleeve 113 moves downward, it presses down on the clamp 111 on the fixing sleeve 110, making the clamp 111 vertical. The vertical clamp 111 clamps onto the gas cylinder nozzle 5, thereby fixing the liquid dispensing gun 1 onto the gas cylinder. The pneumatic adjustment mechanism 2 includes a housing 201. The housing 201 has a first inner cavity and a second inner cavity. The side wall of the housing 201 has a compressed air connection hole 202, which communicates with the first inner cavity. The back of the shell 201 has a first connecting hole 203, a second connecting hole 204, and a third connecting hole 205. The position of the first connecting hole 203 corresponds to the position of the first air inlet 102, the position of the second connecting hole 204 corresponds to the position of the second air inlet 103, and the position of the third connecting hole 205 corresponds to the position of the third air inlet 104. A through hole 206 is provided between the first inner cavity and the second inner cavity. The first adjusting mechanism 3 is installed inside the first inner cavity, and the second adjusting mechanism 4 is installed inside the second inner cavity. The first adjusting mechanism 3 includes a first adjusting shaft 301. A first sealing ring 302 and a second sealing ring 303 are fixedly connected to the surface of the first adjusting shaft 301. The first sealing ring 302 is located above the second sealing ring 303.By changing the position of the first adjusting shaft 301, the positions of the first sealing ring 302 and the second sealing ring 303 can be changed, thereby changing the communication state between the first connecting hole 203, the second connecting hole 204, the third connecting hole 205 and the compressed air connecting hole 202. The second adjusting mechanism 4 includes a second adjusting shaft 401, and the surface of the second adjusting shaft 401 is fixedly connected to the third sealing ring 402 and the fourth sealing ring 403. The third sealing ring 402 is located above the fourth sealing ring 403. By changing the position of the second adjusting shaft 401, the positions of the third sealing ring 402 and the fourth sealing ring 403 can be changed. The position of 03 changes the connection state between the first connecting hole 203, the second connecting hole 204, the third connecting hole 205 and the compressed air connecting hole 202. In use, the compressed air pipe is connected to the compressed air connecting hole 202, and compressed air is introduced into the outer casing 201. Then, the positions of the first adjusting mechanism 3 and the second adjusting mechanism 4 are adjusted so that compressed air can enter the main body 101 of the dispensing gun from different air inlets, thereby controlling the movement of the first piston 105 and the second piston 106, thus realizing the operation of locking the gas cylinder nozzle 5 of the dispensing gun 1 and adding gas to the gas cylinder nozzle 5.

[0041] Specifically, first, the compressed air pipe is installed into the compressed air connection hole 202. Then, the positions of the first adjusting shaft 301 and the second adjusting shaft 401 are adjusted so that the through hole 206 is located between the first sealing ring 302 and the second sealing ring 303, and between the third sealing ring 402 and the fourth sealing ring 403. At this time, the second connection hole 204 is located above the first sealing ring 302, the third connection hole 205 is located below the second sealing ring 303, and the first connection hole 203 is located between the third sealing ring 402 and the fourth sealing ring 403. Compressed air will sequentially pass through the first inner cavity, the through hole 206, the second inner cavity, and the first... The connecting hole 203 and the first air inlet 102 enter the body 101 of the liquid dispensing gun. Compressed air will push the first piston 105 downward and move it downward. The first piston 105 will push the second piston 106 downward and move it to the first stage. When the second piston 106 moves to the first stage, it will drive the moving rod 107 and the connecting nozzle 108 to move to the first stage. When the first stage is moved, the connecting nozzle 108 is still above the gas cylinder nozzle 5 and has not entered the gas cylinder nozzle 5 to fill it. The limiting sleeve 113 will move downward, so that the clamp 111 is in a vertical state. At this time, the clamp 111 will clamp on the gas cylinder nozzle 5, so as to achieve the effect of fixing the liquid dispensing gun 1.

[0042] Next, adjust the positions of the first adjustment mechanism 3 and the second adjustment mechanism 4, and control the first adjustment shaft 301 to move upward so that the through hole 206 and the second connecting hole 204 are located between the first sealing ring 302 and the second sealing ring 303. Control the second adjustment shaft 401 to move upward so that the through hole 206 is located at the fourth sealing ring 403. At this time, the through hole 206 will be blocked by the fourth sealing ring 403, and the compressed air cannot enter the second inner cavity from the first inner cavity. The compressed air will enter the liquid gun body 101 through the first inner cavity, the second connecting hole 204, and the second through hole 103 in sequence. The compressed air will push the first piston 105 to move upward so that the first piston 105 returns to its original position and pushes the second piston 106 to move downward in the second stage. At this time, the second piston 106 will continue to move downward with the moving rod 107 and the connecting nozzle 108 so that the connecting nozzle 108 can be inserted into the gas storage bottle nozzle 5. At this time, the gas storage bottle can be filled with gas using the connecting nozzle 108.

[0043] After inflation is complete, adjust the first adjustment mechanism 3 to control the first adjustment shaft 301 to move downwards, so that the through hole 206 and the third connecting hole 205 are located between the first sealing ring 302 and the second sealing ring 303. The second adjustment shaft 401 remains stationary. At this time, compressed air will enter the liquid gun body 101 through the first inner cavity, the third connecting hole 205, and the third air inlet 104 in sequence. The compressed air will push the second piston 106 to move upwards. The second piston 106 will drive the moving rod 107 and the connecting nozzle 108 to move upwards together. At this time, the connecting nozzle 108 is pulled out from the gas storage bottle nozzle 5, and the limiting sleeve 113 moves upwards and no longer limits the gripper 111, so that the liquid gun 1 can be removed from the gas storage bottle nozzle 5.

[0044] The bottom of the liquid filling gun 1 is provided with a gas storage bottle nozzle 5, and the clamp 111 is located on the gas storage bottle nozzle 5. The liquid filling gun 1 can be clamped and installed on the gas storage bottle by the clamp 111, which facilitates stable filling.

[0045] Working principle: During use, by controlling the movement of the first adjusting shaft 301 and the second adjusting shaft 401, the air passage state inside the outer shell 201 is changed, so that compressed air can enter the main body 101 of the liquid filling gun from different air inlets. The movement of the first piston 105 and the second piston 106 is controlled, thereby achieving the effect of locking the liquid filling gun 1 and the gas storage bottle before filling, avoiding the situation where the liquid filling gun and the gas storage bottle separate during the filling process, causing LNG gas leakage.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An active pressure relief safety switch for an LNG pneumatic filling gun, comprising a filling gun (1), characterized in that: The side wall of the dispensing gun (1) is equipped with a pneumatic adjustment mechanism (2). The pneumatic adjustment mechanism (2) is internally equipped with a first adjustment mechanism (3) and a second adjustment mechanism (4). The dispensing gun (1) includes a dispensing gun body (101). The side wall of the dispensing gun body (101) is provided with a first air inlet (102), a second air inlet (103) and a third air inlet (104). The dispensing gun body (101) is internally equipped with a first piston (105) and a second piston (106). The first air inlet (102) is located above the first piston (105), the second air inlet (103) is located between the first piston (105) and the second piston (106), and the third air inlet (104) is located below the second piston (106). The pneumatic adjustment mechanism (2) includes a housing (201). The shell (201) has a first inner cavity and a second inner cavity inside. The side wall of the shell (201) has a compressed air connection hole (202) which is connected to the first inner cavity. The back of the shell (201) has a first connection hole (203), a second connection hole (204) and a third connection hole (205). The position of the first connection hole (203) corresponds to the position of the first air inlet (102), the position of the second connection hole (204) corresponds to the position of the second air inlet (103), and the position of the third connection hole (205) corresponds to the position of the third air inlet (104). A through hole (206) is provided between the first inner cavity and the second inner cavity. The first adjustment mechanism (3) is installed inside the first inner cavity, and the second adjustment mechanism (4) is installed inside the second inner cavity.

2. The active pressure relief safety switch for an LNG pneumatic filling gun according to claim 1, characterized in that: The bottom of the second piston (106) is fixedly connected to a moving rod (107), the bottom of the moving rod (107) passes through the bottom of the liquid dispensing gun body (101) to the bottom of the liquid dispensing gun body (101), and the bottom of the moving rod (107) is fixedly connected to a connecting nozzle (108).

3. The LNG pneumatic filling gun active pressure relief safety switch according to claim 2, characterized in that: The bottom of the liquid dispensing gun body (101) is fixedly connected to a fixed post (109), the bottom of the fixed post (109) is fixedly connected to a fixed sleeve (110), and the inside of the fixed sleeve (110) is movably connected to a clamp (111), and the number of clamps (111) is multiple.

4. The active pressure relief safety switch for an LNG pneumatic filling gun according to claim 3, characterized in that: The outer side of the fixing sleeve (110) is fitted with a limiting sleeve (113), the outer surface of the connecting mouth (108) is provided with a slot (112), the surface of the limiting sleeve (113) is provided with a screw hole (114), a screw is installed inside the screw hole (114), and the end of the screw extends into the inside of the slot (112).

5. The active pressure relief safety switch for an LNG pneumatic filling gun according to claim 1, characterized in that: The first adjustment mechanism (3) includes a first adjustment shaft (301), and a first sealing ring (302) and a second sealing ring (303) are fixedly connected to the surface of the first adjustment shaft (301). The first sealing ring (302) is located above the second sealing ring (303).

6. The active pressure relief safety switch for an LNG pneumatic filling gun according to claim 1, characterized in that: The second adjustment mechanism (4) includes a second adjustment shaft (401), and a third sealing ring (402) and a fourth sealing ring (403) are fixedly connected to the surface of the second adjustment shaft (401). The third sealing ring (402) is located above the fourth sealing ring (403).

7. The active pressure relief safety switch for an LNG pneumatic filling gun according to claim 3, characterized in that: The bottom of the liquid dispensing gun (1) is provided with a gas storage bottle nozzle (5), and the gripper (111) is located on the gas storage bottle nozzle (5).

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