Efficient LNG (Liquefied Natural Gas) filling equipment

Abstract

The invention relates to the technical field of LNG filling equipment, in particular to efficient LNG filling equipment which comprises a gun body and an injection control mechanism, the injection control mechanism comprises a guide seat fixed to the gun body and a self-control valve assembly arranged in the guide seat, and the self-control valve assembly comprises a valve seat sliding in the guide seat and a gas pipe connected to the rear end of the valve seat. The rear end of the air pipe is connected to a driving handle of filling equipment, the front end of the spray pipe is connected to a gun head, aligned with the filling equipment, in the gun body, a staged elastic valve combination is arranged in the valve seat, and when the locking handle acts to clamp the gun body to an inflation inlet of external equipment, the air pipe is pushed to act and can be automatically closed. A filling worker does not need to independently liberate one hand to operate a sprinkling can and other air injection branches, the filling worker does not need to control the filling gun to be aligned with an inflation inlet of external equipment for inflation butt joint with one hand, and compared with the prior art, the working efficiency is improved, and labor force is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG filling equipment, and in particular to a high-efficiency LNG filling equipment. Background Art

[0002] LNG bunkering equipment refers to specialized equipment systems used to safely and efficiently deliver liquefied natural gas (LNG) to liquefied natural gas (LNG)-fueled vehicles, ships, or storage tanks. It is a core terminal operating device in the LNG fuel supply chain. It stably delivers LNG liquid or vapor fuel at ultra-low temperatures of -162°C, accurately measures the filling volume, and achieves automatic shutoff via a flow meter and control system. In addition to the filling machine, common bunkering equipment also includes a filling gun connected to the machine. The gun consists of a gun head, feed piping, pressure regulator, and locking mechanism. To use, the gun head is docked with the filling port, and the gun head is inserted into the filling port and locked by turning the handle on the locking mechanism.

[0003] Existing LNG filling guns are prone to ice crystals and impurities accumulating on the gun tip after long-term use, leading to seal failure and reduced filling efficiency. Before plugging in the filling port of external equipment, it needs to be cleaned to prevent impurities from entering. Conventional cleaning methods require manual use of a spray bottle or hand wiping, which is cumbersome and affects filling efficiency. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides the following technical solutions: A high-efficiency LNG filling equipment includes a gun body and an injection control mechanism, the injection control mechanism includes a guide seat fixed on the gun body and a self-made valve assembly arranged in the guide seat, the self-made valve assembly includes a valve seat sliding in the guide seat and an air pipe connected to the rear end of the valve seat, the rear end of the air pipe is connected to the driving handle of the filling equipment, the front end of the guide seat is provided with a nozzle, the front end of the nozzle is connected to the gun head aligned with the filling equipment in the gun body, the rear end of the nozzle enters the guide seat corresponding to the movement direction of the valve seat, a stage-type elastic valve combination is provided in the valve seat, when the stage-type elastic valve combination moves with the valve seat to be restricted by the rear end of the nozzle, the stage-type elastic valve combination is triggered to automatically open, so that the gas from the air pipe is sprayed onto the gun head 30 of the filling equipment through the nozzle, when the stage-type elastic valve combination continues to move to the next position under the action of the reverse force of the rear end of the nozzle, the stage-type elastic valve combination is triggered to automatically close.

[0005] As a further preferred embodiment, the front end of the nozzle enters the gun body and is provided with a nozzle seat surrounding the front end of the outer periphery of the gun head, and a plurality of nozzle holes are opened in a ring array on the nozzle seat.

[0006] As a further preferred embodiment, a joint is provided on the air pipe, and an external air source is connected to the joint via a hose to provide inert gas to the air pipe.

[0007] As a further preferred embodiment, a plurality of leakage holes are provided in a ring array on the docking portion at the front end of the gun body.

[0008] As a further preferred embodiment, a through hole is opened from the front end of the valve seat to the rear, and a variable diameter cavity communicating with the through hole is opened on the inner rear side of the valve seat, the diameter of the variable diameter cavity is larger than the diameter of the through hole, and the stage-type elastic valve combination includes a docking tube entering into the through hole, a radial hole is opened at a radial position of the docking tube, a thickened portion is provided at the rear end of the docking tube, and a stepped portion matching the thickened portion is provided at the rear end of the through hole; the stage-type elastic valve combination also includes a control member connected to the rear end of the thickened portion, a protrusion is provided at the rear end of the control member, the protrusion extends backward into the variable diameter cavity, a spring is connected between the rear end of the control member and the rear end wall of the variable diameter cavity, and a controllable tube is provided at the connecting end of the air pipe and the valve seat to form a blocking relationship with the protrusion.

[0009] As a further preference, the guide seat is of split type, consisting of a front end portion and a rear end portion which are connected front to back and can be detachably combined together, the front end portion is provided with a through hole, and the nozzle is connected to the guide seat through the through hole.

[0010] As a further preference, a positioning guide hole communicating with the left and right sides is opened in the guide seat, and the front end of the valve seat is provided with a positioning seat slidingly fitted on the wall of the positioning guide hole, and the front end of the positioning seat is provided with a connecting portion communicating with the front end of the through hole, and the aperture of the connecting portion is larger than the diameter of the nozzle.

[0011] As a further preference, an annular partition made of rubber is provided in the gun body, an annular partition is provided with an annular insertion hole, and the gun head of the LNG filling equipment passes through the annular partition through the annular insertion hole.

[0012] The beneficial effects of the present invention compared to the prior art are: A guide seat is provided on the outside of the gun body of the filling gun, and a self-made valve assembly is provided in the guide seat, an air pipe is installed at one end of the self-made valve assembly, and a nozzle is installed at the other end, one end of the nozzle enters the self-made valve assembly and is aligned with the self-made valve assembly, and the other end of the nozzle enters the filling gun and is aligned with the gun head, one end of the air pipe is connected to the self-made valve assembly, and the other end is connected to the locking handle of the filling gun, and the driving handle is operated to push the gun head in the gun body to align with the inflation port of the external equipment before the plug-in movement, and the driving force of the driving handle is also applied to the air pipe, so that the air pipe pushes the valve seat to move in advance, and the valve seat drives the self-made valve assembly to move in advance. A stage-type elastic valve combination is provided in the self-made valve assembly, and the stage-type elastic valve combination automatically opens at this time to connect the air pipe and the nozzle, and external gas passes The nozzle enters the gun body to automatically clean the impurities on the gun head, and as the gun head of the filling gun is completely inserted into the inflation port of the external equipment, the stage-type elastic valve combination will automatically close, so that the air pipe and the nozzle are cut off from ventilation, and the external gas no longer enters the nozzle, so that the external jet function is automatically controlled. The gun head is inserted into the inflation port of the external equipment, and the driving handle needs to be operated to link the above-mentioned jet function to the driving handle, and the automatic control of the jet action is realized through the automatic control of the valve seat. It does not require the filling personnel to free up one hand to operate other jet branches such as the spray pot, nor does it require the filling personnel to operate the filling gun with one hand to aim at the inflation port of the external equipment for inflation docking, which improves work efficiency and saves labor compared with the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional schematic diagram of an efficient LNG filling equipment provided by an embodiment of the present invention; Figure 2 An efficient LNG filling equipment provided by the embodiment of the present invention is composed of Figure 1 A schematic diagram from another perspective; Figure 3 A schematic end view of an efficient LNG filling device provided by an embodiment of the present invention as viewed from the driving handle end; Figure 4 An efficient LNG filling equipment provided by the embodiment of the present invention is composed of Figure 3 The plane diagram of the section A is shown below; Figure 5 An efficient LNG filling equipment provided by the embodiment of the present invention is composed of Figure 4 The enlarged schematic diagram of part B is shown; Figure 6 A partially cutaway schematic diagram of a three-dimensional perspective of an efficient LNG filling equipment provided by an embodiment of the present invention.

[0014] In the figure: 10, gun body; 101, leakage hole; 102, annular partition; 20, injection control mechanism; 210, guide seat; 220, self-made valve assembly; 230, valve seat; 2301, through hole; 2302, reducing cavity; 2303, docking tube; 2304, radial hole; 2305, thickened part; 2306, stepped part; 2307, control part; 2308, raised part; 2309, spring; 2310, controllable tube; 2311, positioning seat; 2312, connecting part; 240, air pipe; 2401, joint; 2101, nozzle; 2102, nozzle seat; 2103, nozzle hole; 2104, through hole; 2105, positioning guide hole; 30, gun head. DETAILED DESCRIPTION

[0015] The above and other embodiments and advantages of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments.

[0016] In one embodiment, Figures 1-6 As shown: This embodiment provides an efficient LNG filling device, including a gun body 10 and an injection control mechanism 20, the injection control mechanism 20 includes a guide seat 210 fixed to the gun body 10 and a self-made valve assembly 220 arranged in the guide seat 210, the self-made valve assembly 220 includes a valve seat 230 sliding in the guide seat 210 and an air pipe 240 connected to the rear end of the valve seat 230, the rear end of the air pipe 240 is connected to the driving handle of the filling device, the front end of the guide seat 210 is provided with a nozzle 2101, the front end of the nozzle 2101 is connected to the gun body 10 aimed at the filling device. Head 30, the rear end of the nozzle 2101 enters the guide seat 210 corresponding to the movement direction of the valve seat 230. A stage-type elastic valve combination is provided in the valve seat 230. When the stage-type elastic valve combination moves with the valve seat 230 to be restricted by the rear end of the nozzle 2101, the stage-type elastic valve combination is triggered to automatically open, so that the gas from the air pipe 240 is sprayed onto the gun head 30 of the filling equipment through the nozzle 2101. When the stage-type elastic valve combination continues to move to the next position under the action of the reverse force of the rear end of the nozzle 2101, the stage-type elastic valve combination is triggered to automatically close.

[0017] When using the filling device (filling gun), pull it out from the gas station, and then align the front end of the gun body 10 with the filling port of the external device (external car or gas storage tank) to prepare for filling. The traditional way is that the filling personnel holds the filling device with one hand, and uses the nozzle or spray bottle in the other hand to spray the air at the front end of the gun head 30 in the gun body 10, so that the impurities that may be attached to the gun head 30 are cleaned downwards, and the impurities are prevented from entering the external device along with the gas during filling. At the same time, it also prevents impurities from affecting the normal connection between the gun head 30 and the filling port of the external device, and also reduces static electricity to avoid accidents. However, this cleaning method makes it impossible for the cleaning personnel to hold the filling device with both hands, which is labor-intensive and inefficient. In this embodiment, the present invention provides a spray control mechanism 20 on the gun body 10, which can solve this technical problem and improve work efficiency. The filling personnel should grasp with both hands as much as possible. Figure 1 ,or Figure 2 The two driving handles shown are pulled forward by both hands at the same time, and the two driving handles push the gun head 30 at the same part of the gun body 10 forward (the existing driving technology of the manual filling gun), so that the gun head 30 moves relative to the inflation port of the external device. At the same time, the two driving handles will also push the air pipe 240 forward, and the air pipe 240 will push the valve seat 230 forward, so that the valve seat 230 will be pressed against the rear end of the nozzle 2101 and continue to move forward for a stroke (for example, a stroke of 8 cm). Under the action of the reverse force of the rear end of the nozzle 2101 on the valve seat 230, the stage-type elastic valve combination will act for the first time. At this time, the self-made valve assembly 220 is opened, the air pipe 240 and the nozzle 2101 are connected, and the external gas from the air pipe 240 enters the nozzle 2101. At the same time, the gun The gun head 30 in the body 10 reaches the spray range of the nozzle 2101 under the push of the driving handle. The gas ejected from the nozzle 2101 is sprayed onto the gun head 30, so that the impurities on the gun head 30 are automatically cleaned. The two driving handles are continued to be pushed, and the two driving handles continue to push the gun head 30 forward until the gun head 30 is inserted into the inflation port of the external equipment. At the same time, the valve seat 230 is pushed forward by the air pipe 240. The valve seat 230 is attached to the rear end of the nozzle 2101, causing the staged elastic valve combination in the valve seat 230 to retreat. At this time, the homemade valve assembly 220 is closed, the air pipe 240 and the nozzle 2101 are no longer connected, the external gas from the air pipe 240 no longer enters the nozzle 2101, the nozzle 2101 stops jetting, and the filling gun only adds steam to the external equipment at this time.

[0018] In this embodiment, before filling, in order to clean the impurities on the gun head 30 in advance, the injection control mechanism 20 is set on the gun body 10, which not only eliminates the need for the filling personnel to free up one hand to operate other injection branches such as the spray bottle, but also eliminates the need for the filling personnel to control the filling gun with one hand to aim at the inflation port of the external equipment for inflation docking, thereby improving work efficiency and saving labor compared with the existing technology.

[0019] like Figure 4 、 Figure 5 as well as Figure 6 As shown, the specific structure of the stage-type elastic valve assembly is described as follows: a through hole 2301 is opened from the front end of the valve seat 230 to the rear, a variable diameter cavity 2302 is opened on the inner rear side of the valve seat 230 and communicates with the through hole 2301, the diameter of the variable diameter cavity 2302 is larger than the diameter of the through hole 2301, the stage-type elastic valve assembly includes a butt joint 2303 entering into the through hole 2301, a radial hole 2304 is opened at a radial position of the butt joint 2303, and when the radial hole 2304 is located in the through hole 2301, it is blocked by the hole wall of the through hole 2301 and is closed, and the butt joint 2303 is closed. The rear end of the through hole 2301 is provided with a thickened portion 2305, and the rear end of the through hole 2301 is provided with a stepped portion 2306 that matches the thickened portion 2305; the stage-type elastic valve assembly also includes a control member 2307 connected to the rear end of the thickened portion 2305, and the rear end of the control member 2307 is provided with a protrusion 2308, which extends backward into the variable diameter cavity 2302, and a spring 2309 is connected between the rear end of the control member 2307 and the rear end wall of the variable diameter cavity 2302, and the connecting end of the air pipe 2202 and the valve seat 230 is provided with a controllable tube 2310 that forms a blocking relationship with the protrusion 2308. The working principle of the stage-type elastic valve combination is described as follows: when the driving handle is pulled, the driving handle pushes the gun head 30 forward, and the driving handle also pushes the air pipe 2202 forward, and the air pipe 2202 pushes the valve seat 230 and all the above-mentioned structures and components in the valve seat 230 forward, wherein when the docking tube 2303 moves forward until its front end contacts the rear end of the nozzle 2101, since the nozzle 2101 is fixed, as the docking tube 2303 continues to move forward, the rear end of the nozzle 2101 will provide a rightward reaction force to the front end of the docking tube 2303, forcing the docking tube 2303 to move to the right along the through hole 2301, and the docking tube 2303 carries the radial hole 2304 and the control member 2307 to The right movement sends the radial hole 2304 and the control part 2307 into the variable diameter cavity 2302. At this time, the spring 2309 is compressed and shortened by the control part 2307. Since the radial hole 2304 on the docking tube 2303 enters the variable diameter cavity 2302, and the aperture size of the variable diameter cavity 2302 is larger than the tube diameter size of the docking tube 2303, the gas from the air pipe 2202 in the variable diameter cavity 2302 enters the docking tube 2303 through the radial hole 2304. At this time, the front end of the docking tube 2303 touches the rear end of the nozzle 2101. Therefore, the gas enters the nozzle 2101 and is sprayed into the gun head 30 by the nozzle 2101 to complete the impurity cleaning. This is also the automatic opening principle of the homemade valve assembly 220.

[0020] Continuing from the above, as the amplitude of the driving handle is gradually increased, the driving handle pushes the gun head 30 to be inserted into the inflation port of the external device, and the air pipe 2202 pushes the valve seat 230 to continue to move forward. At this time, the spring 2309 is compressed to the limit, and the front end of the docking tube 2303 is restricted by the rear end of the nozzle 2101. At this time, only the valve seat 230 moves forward, especially the valve seat 230 continues to move forward with the through hole 2301 and the reducing cavity 2302 until the controllable tube 2310 is buckled on the protrusion 2308 and blocked, so that the gas from the air pipe 240 is blocked and no longer enters the reducing cavity 2302, nor enters the docking tube 2303 through the radial hole 2304, and the docking tube 2303 will not be sprayed onto the gun head 30 of the filling device. At this time, the gun head 30 has been inserted into the inflation port of the external device after gas cleaning in advance, so no gas cleaning is required. This is also the automatic closing principle of the homemade valve assembly 220.

[0021] Continuing from the above, when removing the filling gun, pull the driving handle in the opposite direction, and the driving handle drags the air pipe 240 backward to reset. The air pipe 240 drags the valve seat 230 and all structures and components on the valve seat 230 backward, especially the front end of the docking tube 2303 is separated from the rear end of the nozzle 2101, the front end of the docking tube 2303 loses its restriction, the spring 2309 releases its length, and pushes the control member 2307 forward in the opposite direction. The control member 2307 pushes the docking tube 2303 forward in the opposite direction, and the radial hole 2304 on the docking tube 2303 retreats forward and returns to the through hole 2301 and is closed by the hole wall of the through hole 2301. The protrusion 2308 resets forward and leaves the controllable tube 2310. The external gas enters the variable diameter cavity 2302 again through the air pipe 240 and the controllable tube 2310 for storage, waiting for the next use.

[0022] In continuation of the above, by providing a self-made valve assembly 220, the present invention not only eliminates the need for the filling personnel to perform advance cleaning of the gun head 30 when the filling gun is used, but also the self-made valve assembly 220 adopts a staged elastic valve combination composed of two front and rear nesting doll-like valve body units to realize that the opening and closing are controlled by the same movement direction, which greatly improves the convenience during operation. Moreover, the valve seat 230 slides in the positioning guide hole 2105 of the guide seat 210 through the front positioning seat 2311, and the docking pipe 2303 slides in the through hole 2301 to form a smooth guide, which ensures that the opposite ends of the docking pipe 2303 and the nozzle 2101 can be quickly and accurately docked when the action is triggered.

[0023] like Figure 4 、 Figure 5As shown, the front end of the positioning seat 2311 is provided with a connecting portion 2312 that communicates with the front end of the through hole 2301. The aperture of the connecting portion 2312 is larger than the tube diameter of the nozzle 2101. When the positioning seat 2311 moves forward, the connecting portion 2312 is used to dock the rear end of the nozzle 2101 with the front end of the docking tube 2303. During actual assembly, a sealing ring can also be provided in the connecting portion 2312 or at the rear end of the nozzle 2101 to improve the sealing during docking.

[0024] In another embodiment, Figure 3 、 Figure 6 As shown, the front end of the nozzle 2101 enters the gun body 10 and is provided with a nozzle seat 2102 surrounding the front end of the outer periphery of the gun head 30. A plurality of nozzle holes 2103 are opened in a circular array on the nozzle seat 2102. In this embodiment, when the driving handle is pulled to push the gun head 30 forward, if the gun head 30 has not reached the surrounding range of the nozzle seat 2102, the driving handle will also push the valve seat 230 at the front end of the air pipe 240 toward the rear end of the nozzle 2101 by pushing the air pipe 240 forward. The rear end of the nozzle 2101 is fixed while the gun head 30 and the valve seat 230 continue to move forward with the pulling range of the driving handle. The valve seat 230 is subjected to the reaction force of the rear end of the nozzle 2101, causing the staged elastic valve combination to complete one action. At this time, the self-made valve assembly 220 opens, the nozzle 2101 sprays air, and the gas enters the nozzle seat 2102 and is ejected outward through the nozzle hole 2103. As the pulling range of the driving handle increases, the gun head 30 continues to move into the surrounding range of the nozzle seat 2102. The gas ejected from the nozzle hole 2103 is sprayed onto the gun head 30, so that impurities on the gun head 30 are cleaned downward. The arrangement of the nozzle seat 2102 and the nozzle hole 2103 increases the spraying area and improves the cleaning efficiency.

[0025] It needs to be further explained that, Figure 2 As shown, the air pipe 240 is provided with a connector 2401, to which an external air source is connected via a hose, for supplying inert gas to the air pipe. In actual use, the outer end of the connector 2401 is connected to the hose, which in turn is connected to an inert gas source. The inert gas acts as a gas medium to purge impurities, creating an inert protective function within the cavity between the gun tip 30 and the gun body 10. This prevents sparks from friction when the gun tip 30 is connected to the inlet port on an external device, providing a certain degree of flame retardancy and explosion protection for personnel, thereby enhancing safety.

[0026] A number of leakage holes 101 are provided in a circular array on the docking portion at the front end of the gun body 10, and the spray hole 2103 is opened obliquely in the direction of the leakage hole 101. According to the operating principle of the filling gun, the front end of the gun body 10 is stuck on the external device, and the inflation port of the external device is buckled in the gun body 10. The gun head 30 moves toward the inflation port when the driving handle is turned, and is finally inserted into the inflation port. In the present invention, the outer wall surface of the gun head 30 will be cleaned of impurities in advance by inert gas before being inserted into the inflation port. The cleaned impurities are blown toward the leakage hole 101 by the spray hole 2103 and finally discharged from the leakage hole 101.

[0027] The guide seat 210 is a split type, consisting of a front end portion and a rear end portion that are connected to each other and can be detachably combined together. The front end portion is provided with a through hole 2104 , and the nozzle 2101 is connected to the guide seat 210 via the through hole 2104 .

[0028] An annular baffle 102 made of rubber is provided in the gun body 10. An annular insertion hole is provided on the annular baffle 102. The gun head of the LNG filling equipment passes through the annular baffle 102 through the annular insertion hole. The annular baffle 102 is used to prevent impurities from continuing to flow backward, thereby ensuring that impurities are discharged through the leakage hole 101 to the greatest extent.

[0029] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described based on their actual installation and actual use, as well as the customary orientations of those skilled in the art. This is hereby explained.

[0030] The specific embodiments described above further illustrate the purpose of the present invention, technical solutions, and beneficial effects. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An efficient LNG filling equipment, characterized in that: The invention comprises a gun body (10) and an injection control mechanism (20), wherein the injection control mechanism (20) comprises a guide seat (210) fixed on the gun body (10) and a self-made valve assembly (220) arranged in the guide seat (210), wherein the self-made valve assembly (220) comprises a valve seat (230) sliding in the guide seat (210) and an air pipe (240) connected to the rear end of the valve seat (230), wherein the rear end of the air pipe (240) is connected to the driving handle of the filling device, and the front end of the guide seat (210) is provided with a nozzle (2101), wherein the front end of the nozzle (2101) is connected to the gun head (30) in the gun body (10) and is aligned with the filling device. 0), the rear end of the nozzle (2101) enters the guide seat (210) corresponding to the movement direction of the valve seat (230), and a stage-type elastic valve combination is provided in the valve seat (230). When the stage-type elastic valve combination moves with the valve seat (230) to be restricted by the rear end of the nozzle (2101), the stage-type elastic valve combination is triggered to automatically open, so that the gas from the air pipe (240) is sprayed onto the gun head 30 of the filling equipment through the nozzle (2101). When the stage-type elastic valve combination continues to move to the next position under the action of the reverse force of the rear end of the nozzle (2101), the stage-type elastic valve combination is triggered to automatically close.

2. The efficient LNG filling equipment according to claim 1, characterized in that: The front end of the nozzle (2101) enters the gun body (10) and is provided with a nozzle seat (2102) surrounding the front end of the outer periphery of the gun head (30). A plurality of nozzle holes (2103) are provided in a ring array on the nozzle seat (2102).

3. The efficient LNG filling equipment according to claim 1, characterized in that: The air pipe (240) is provided with a joint (2401), and an external gas source is connected to the joint (2401) via a hose to provide inert gas to the air pipe (240).

4. The efficient LNG filling equipment according to claim 2, characterized in that: A plurality of leak holes (101) are provided in a ring array on the docking portion at the front end of the gun body (10).

5. The efficient LNG filling equipment according to claim 3, characterized in that: A through hole (2301) is provided from the front end of the valve seat (230) to the rear, a diameter-changing cavity (2302) communicating with the through hole (2301) is provided on the inner rear side of the valve seat (230), the diameter of the diameter-changing cavity (2302) is larger than the diameter of the through hole (2301), the stage-type elastic valve assembly includes a butt joint (2303) entering into the through hole (2301), a radial hole (2304) is provided at a radial position of the butt joint (2303), a thickened portion (2305) is provided at the rear end of the through hole (2301), and a hole (2306) is provided at the rear end of the butt joint (2303) to communicate with the thickened portion (2307). The stage-type elastic valve assembly further comprises a control member (2307) connected to the rear end of the thickened portion (2305); the rear end of the control member (2307) is provided with a protrusion (2308), the protrusion (2308) extends backward into the variable diameter cavity (2302), a spring (2309) is connected between the rear end of the control member (2307) and the rear end wall of the variable diameter cavity (2302), and a controllable tube (2310) is provided at the connecting end of the air pipe (2202) and the valve seat (230) to form a blocking relationship with the protrusion (2308).

6. The efficient LNG filling equipment according to claim 4, characterized in that: The guide seat (210) is a split type, consisting of a front end portion and a rear end portion that are connected to each other and can be detachably combined together. The front end portion is provided with a through hole (2104), and the nozzle (2101) is connected to the guide seat (210) through the through hole (2104).

7. The efficient LNG filling equipment according to claim 6, characterized in that: A positioning guide hole (2105) communicating with each other on the left and right is provided in the guide seat (210), a positioning seat (2311) is provided at the front end of the valve seat (230) and is slidably fitted on the hole wall of the positioning guide hole (2105), and a connecting portion (2312) communicating with the front end of the through hole (2301) is provided at the front end of the positioning seat (2311), and the hole diameter of the connecting portion (2312) is larger than the tube diameter of the nozzle (2101).

8. The efficient LNG filling equipment according to claim 7, characterized in that: An annular partition (102) made of rubber is provided in the gun body (10), and an annular insertion hole is provided on the annular partition (102). The gun head of the LNG filling equipment passes through the annular partition (102) through the annular insertion hole.

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