A marine LNG filling machine

Abstract

The present application relates to LNG filling machine technical field, especially provide a marine LNG filling machine, including machine body and control assembly, the machine body is equipped with filling tank, circulating tank and inert tank, the gas outlet end of filling tank is equipped with filling pipe, the other end of filling pipe is worn to the outside of machine body and is equipped with filling pipe butt joint pipe, the first gas outlet pipe is equipped on circulating tank, the control assembly includes the piston control piece installed on the first gas outlet pipe, the control assembly includes the first contact valve installed on the second gas outlet pipe and with piston control piece forms trigger relation;The gas-liquid mixing tank is connected on the second gas outlet pipe, the third gas outlet pipe is connected on the gas-liquid mixing tank, after filling gun and filling pipe butt joint pipe butt joint, the protection of inert mixture is not needed, and the purpose of automatically stopping the supply of inert mixture is achieved.Therefore, the automatic control of inert tank and gas-liquid mixing tank meets the protection requirements during filling, and automatic control is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LNG filling machines, in particular to a marine LNG filling machine. BACKGROUND

[0002] The marine LNG filling machine generally includes an air inlet system, a gas return system and other safety and control systems to ensure that LNG can be safely and efficiently transferred from the filling machine to the gas storage tank of the ship. As LNG is increasingly used as a clean fuel in the shipping industry, the demand for marine LNG filling machines is growing to support the operation of LNG-powered ships. One end of the filling pipe is connected to the filling pipe of the filling machine through a joint, and the other end of the filling pipe is connected to the filling pipe (or filling port) on the ship through a column gun. During the docking process, mechanical friction between metal parts in the filling joint (such as flanges, quick couplings) is prone to generate sparks. The traditional filling machine lacks an effective suppression mechanism for this risk.

[0003] Although the operation specification requires controlling the flow rate, using explosion-proof tools, etc., in the actual complex operation environment (such as ship sway, limited operation space), the probability of sparks generated by accidental collision or sliding friction of metal parts is significantly increased. Once the spark comes into contact with the escaped methane gas, it is likely to cause a fire and explosion accident. Some existing technologies attempt to introduce inert gas (such as nitrogen) at the interface to reduce oxygen concentration, but there is a common defect of "manual triggering", and the protection is not timely and the safety is low when the safety factor occurs. SUMMARY

[0004] To solve the above problems, the present application provides the following technical solutions:

[0005] A marine LNG filling machine, comprising a machine body and a control assembly, the machine body is provided with a filling tank, a circulating tank and an inert tank, the gas outlet end of the filling tank is provided with a filling pipe, the other end of the filling pipe penetrates to the outside of the machine body and is provided with a filling pipe docking pipe, the circulating tank is provided with a first gas outlet pipe, the control assembly comprises a piston control member installed on the first gas outlet pipe, the inert tank is connected with a second gas outlet pipe, the control assembly comprises a first contact valve installed on the second gas outlet pipe and forming a triggering relationship with the piston control member; the second gas outlet pipe is connected with a gas-liquid mixing tank, the gas-liquid mixing tank is connected with a third gas outlet pipe, the control assembly further comprises a second contact valve installed on the third gas outlet pipe, and the control assembly further comprises a gas jet type control seat arranged near the filling pipe docking pipe, the inner end of the gas jet type control seat enters the machine body and forms a triggering relationship with the second contact valve, and the outer end of the gas jet type control seat is provided with a jet hole.

[0006] In a further preferred embodiment, a compensation pipe is connected to the gas-liquid mixing tank, the gas-liquid mixing tank is filled with a sponge, the water inlet of the compensation pipe is connected to the sponge, the air inlet of the second air outlet pipe is located above the sponge, and a gas storage space is formed between the second air outlet pipe and the top of the sponge, a spray seat is provided below the sponge, and one end of the third air outlet pipe connected to the gas-liquid mixing tank is connected to the spray seat.

[0007] In a further preferred embodiment, the air intake pipes of the filling tank, the circulation tank, and the inert tank extend outside the machine body and are respectively connected to the steam source.

[0008] In a further preferred embodiment, the circulation tank is also equipped with a fourth vent pipe, the other end of which extends outside the machine body and is fitted with a delay valve.

[0009] More preferably, the piston control component includes a piston cylinder mounted on the first exhaust pipe and a piston rod slidably fitted inside the piston cylinder. One end of the piston rod extends beyond one end of the piston cylinder and approaches the first contact valve, and the piston rod can form a triggering relationship with the first contact valve when it extends or retracts.

[0010] In a further preferred embodiment, the body has an assembly hole, and the air-jet control seat includes a seat body locked and fixed in the assembly hole. A first through hole is passed through the eccentric position of the seat body, and a trigger rod passes through the first through hole. The inner end of the trigger rod enters the body and forms a trigger relationship with the second contact valve. The outer end of the trigger rod is connected to a collection seat, and a second through hole is opened on the collection seat. The second through hole surrounds the periphery of the filling pipe connecting pipe. The outer end of the collection seat has a chamfered surface, and several spray holes are arranged in a circular array on the chamfered surface. The spray holes spray gas-liquid medium toward the connecting pipe of the filling pipe connecting pipe. A flexible nozzle is connected to the inner surface of the collection seat, and the inner end of the flexible nozzle passes through the collection seat and is connected to the third air outlet pipe.

[0011] In a further preferred embodiment, a third through hole is provided at the center of the base, through which the filling pipe and connecting pipe pass.

[0012] In a further preferred embodiment, a partition plate is provided above the inner cavity of the machine body, dividing the inner cavity of the machine body into an upper compartment and a lower compartment. An inert tank is installed in the upper compartment, and a filling tank, a circulation tank, and a gas-liquid mixing tank are installed in the lower compartment. A second vent pipe on the inert tank extends into the lower compartment and connects to the gas-liquid mixing tank. A fifth vent pipe is also connected to the inert tank. A solenoid valve located in the upper compartment is installed on the fifth vent pipe. A sensor array is installed in the lower compartment, and the sensor array includes at least a gas sensor and a smoke sensor.

[0013] The advantages of this invention compared to the prior art are:

[0014] 1. The engine body is equipped with an inert gas tank and an inlet gas-liquid mixing tank. Inert gas in the inert gas tank is discharged into the gas-liquid mixing tank through the second outlet pipe, and mixes with the lubricating oil in the gas-liquid mixing tank to obtain an inert mixture. The filling gun at the other end of the filling pipe is connected to the natural gas tank on board the ship, and the filling gun at one end of the filling pipe is connected to the filling pipe connecting pipe. When the filling gun is connected to the filling pipe connecting pipe, the nozzle pushes the gas jet control seat, which triggers the second contact valve to open. The inert gas obtained after mixing in the mixing tank... The mixture is sprayed through the third vent pipe to the outer end of the air-jet control seat, and then sprayed onto the filling pipe connector through the nozzle at the outer end of the air-jet control seat. This ensures that the filling gun is protected by the inert mixture before it is fully connected to the filling pipe connector. For example, the frictional sparks that occur when the filling gun and the filling pipe connector are connected are blocked by the inert gas in the inert mixture. The lubricating oil in the inert mixture reduces the friction when the filling gun and the filling pipe connector are connected, further reducing the safety hazard of sparks caused by friction during the connection and inflation process.

[0015] 2. A fourth vent pipe is also installed on the circulation tank. The other end of the fourth vent pipe extends outside the machine body and is equipped with a delay valve. This controls the amount of gas stored in the gas-liquid mixing tank. The venting volume of the inert tank to the filling pipe connection gradually decreases until it stops. Even if the second contact valve is triggered by driving the air jet control seat, the inert tank will stop discharging the inert mixture, and the air jet control seat will automatically stop discharging the inert mixture to the filling pipe connection. This achieves the goal of automatically stopping the supply of inert mixture after the filling gun and filling pipe connection are connected, without the need for inert mixture protection. Therefore, the automatic control of the inert tank and the gas-liquid mixing tank meets the protection requirements during filling, achieving not only automatic control but also a reasonable structure. Attached Figure Description

[0016] Figure 1 A schematic diagram of a marine LNG refueling machine from a frontal view, provided for an embodiment of the present invention;

[0017] Figure 2 A marine LNG refueling machine provided for embodiments of the present invention comprises... Figure 1 Enlarged view of part A leading to the image;

[0018] Figure 3 A marine LNG refueling machine provided for embodiments of the present invention comprises... Figure 1 A schematic diagram taken from a rear viewpoint;

[0019] Figure 4 A schematic diagram of the interior of a marine LNG refueling machine after the front sealing plate has been removed, provided for an embodiment of the present invention;

[0020] Figure 5 A marine LNG refueling machine provided for embodiments of the present invention comprises...Figure 4 Enlarged schematic diagram of section B;

[0021] Figure 6 The schematic diagram of the piston control component of a marine LNG refueling machine provided for an embodiment of the present invention can be understood as a cylinder.

[0022] Figure 7 A schematic diagram of a nozzle in a marine LNG refueling machine provided for an embodiment of the present invention;

[0023] Figure 8 A marine LNG refueling machine provided for embodiments of the present invention comprises... Figure 4 The diagram shows the further disassembly.

[0024] In the diagram: 10. Main body; 110. Filling tank; 111. Filling pipe; 112. Filling pipe connecting pipe; 120. Circulation tank; 121. First vent pipe; 122. Fourth vent pipe; 123. Delay valve; 130. Inertia tank; 131. Second vent pipe; 132. Gas-liquid mixing tank; 1321. Compensation pipe; 1322. Sponge; 1323. Sprayer base; 133. Third vent pipe; 134. Fifth vent pipe; 20. Control assembly; 210. Piston control component. ; 2101, Piston cylinder; 2102, Piston rod; 220, First contact valve; 230, Second contact valve; 240, Air jet control seat; 2401, Seat body; 2402, First through hole; 2403, Trigger rod; 2404, Collection seat; 2405, Second through hole; 2406, Chamfered surface; 2407, Spray hole; 2408, Flexible nozzle; 2409, Third through hole; 30, Divider plate; 310, Upper partition chamber; 320, Lower partition chamber; 40, Solenoid valve. Detailed Implementation

[0025] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In one implementation, such as Figures 1-8 As shown:

[0027] This embodiment provides a marine LNG refueling machine, including a body 10 and a control assembly 20. The body 10 houses a refueling tank 110, a circulation tank 120, and an inert tank 130. The air inlet pipes of the refueling tank 110, circulation tank 120, and inert tank 130 extend outside the body 10 and are respectively connected to a gas source. The outlet end of the refueling tank 110 is provided with a refueling pipe 111, and the other end of the refueling pipe 111 extends outside the body 10 and is provided with a refueling pipe connecting pipe 112. The circulation tank 120 is provided with a first air outlet pipe 121. The control assembly 20 includes a piston control component 210 mounted on the first air outlet pipe 121. The inert tank 130 is connected to a first... The control assembly 20 includes a second exhaust pipe 131 and a first contact valve 220 installed on the second exhaust pipe 131 and triggered by the piston control component 210. A gas-liquid mixing tank 132 is connected to the second exhaust pipe 131, and a third exhaust pipe 133 is connected to the gas-liquid mixing tank 132. The control assembly 20 also includes a second contact valve 230 installed on the third exhaust pipe 133. The control assembly 20 also includes a pneumatic spray control seat 240 located near the filling pipe connecting pipe 112. The inner end of the pneumatic spray control seat 240 enters the machine body 10 and triggers the second contact valve 230. The outer end of the pneumatic spray control seat 240 has a spray hole.

[0028] In this embodiment, the ship is docked near the LNG refueling machine. The depressurization pipe of the ship's natural gas tank is connected to the inlet pipe of the circulation tank 120, so that the ship's natural gas tank is depressurized before refueling (the gas in the ship's natural gas tank is depressurized and discharged first; the reason for the discharge is a requirement of existing technology and will not be elaborated further). The discharged gas enters the circulation tank 120. After the gas pressure in the circulation tank 120 increases, it is sent to the piston control component 210 (the piston control component 210 can be understood as a cylinder) through the first outlet pipe 121. The actuating rod in the piston control component 210 extends and strikes the first contact valve 220, causing the first contact valve 220 to open. The inert gas in the inert tank 130 is discharged into the gas-liquid mixing tank 132 through the second outlet pipe 131, and mixes with the lubricating oil in the gas-liquid mixing tank 132 to obtain an inert mixture. The other end of the refueling pipe is then used for refueling. The gun is connected to the natural gas tank on board the ship. The gun at one end of the refueling pipe is connected to the refueling pipe coupling 112. When the gun is connected to the refueling pipe coupling 112, the nozzle pushes the gas jet control seat 240. The gas jet control seat 240 triggers the second contact valve 230 to open. The inert mixture obtained after mixing in the mixing tank 132 is sprayed to the outer end of the gas jet control seat 240 through the third gas outlet pipe 133. The gas jet control seat 240 is sprayed onto the refueling pipe coupling 112 through the nozzle at the outer end of the gas jet control seat 240. This ensures that the refueling gun is protected by the inert mixture before it is fully connected to the refueling pipe coupling 112. For example, the frictional sparks that occur when the refueling gun and the refueling pipe coupling 112 are docked are blocked by the inert gas in the inert mixture. The lubricating oil in the inert mixture reduces friction, further reducing the safety hazard of sparks caused by friction during docking and gas filling.

[0029] In this embodiment, Figure 1 and Figure 2 The diagram shows the filling gun and the docking of the filling gun with the filling pipe connector 112. Although the filling gun is existing technology, in order to trigger the action of the air jet control seat 240 in advance when it docks with the filling pipe connector 112, tentacles or rods are provided on both sides of the nozzle of the filling gun to push the outer end of the air jet control seat 240. When the filling gun docks with the filling pipe connector 112, the tentacles or rods will squeeze the outer end of the air jet control seat 240 in advance. As the filling gun inserts into the filling pipe connector 112, the inner end of the air jet control seat 240 will touch the second contact valve 230 and cause the second contact valve 230 to open automatically.

[0030] In this embodiment, according to the gas filling requirements, since the gas in the ship's natural gas tank must be discharged in advance before filling, a circulation tank 120 is provided in the body 10 of the present invention to collect the discharged gas into the circulation tank 120. As the air intake in the circulation tank 120 increases, the gas pressure in the circulation tank 120 also increases, and the gas pressure is converted into the power to drive the piston control component 210 to trigger the opening of the first contact valve 220, thus saving the opening power.

[0031] In this embodiment, such as Figure 3 As shown, a fourth exhaust pipe 122 is also installed on the circulation tank 120. The other end of the fourth exhaust pipe 122 extends outside the machine body 10 and is equipped with a delay valve 123. For example, the delay valve 123 automatically opens after a delay of 8 seconds. The gas collected in the circulation tank 120 will circulate to the filling tank 110 through the fourth exhaust pipe 122. At this time, the gas pressure in the circulation tank 120 decreases, which is insufficient to drive the piston control component 210 to move. The piston control component 210's operating rod retracts, and the first contact valve 220 changes from trigger opening to automatic closing. The inert tank 130 no longer supplies gas to the gas-liquid mixing tank 132. The gas volume in tank 132 is controlled, and the venting volume from inert tank 130 to the filling pipe connector 112 gradually decreases until it stops. At this point, even if the second contact valve 230 is triggered by driving the air jet control seat 240 to open, the inert tank 130 will stop discharging the inert mixture, and the air jet control seat 240 will automatically stop discharging the inert mixture to the filling pipe connector 112. This achieves the goal of automatically stopping the supply of inert mixture after the filling gun and the filling pipe connector 112 are connected, without the need for inert mixture protection. Therefore, the automatic control of inert tank 130 and gas-liquid mixing tank 132 meets the protection requirements during filling and has a reasonable structure.

[0032] like Figure 4 , Figure 7As shown, the structure and mixing principle of the gas-liquid mixing tank 132 are described in detail below: A compensation pipe 1321 (with a one-way valve inside) is connected to the gas-liquid mixing tank 132. The gas-liquid mixing tank 132 is filled with a sponge 1322. The inlet of the compensation pipe 1321 is connected to the sponge 1322. The inlet of the second vent pipe 131 is located above the sponge 1322, and a gas storage space is formed between the second vent pipe 131 and the top of the sponge 1322. A spray seat 1323 is provided below the sponge 1322. One end of the third vent pipe 133 is connected to the spray seat 1323 inside the gas-liquid mixing tank 132. A large number of fine holes are opened on the spray seat 1323, and the fine holes converge to the connection end of the third vent pipe 133. Lubricating oil is periodically replenished to the gas-liquid mixing tank 132 through the compensation pipe 1321. The lubricating oil is absorbed into the sponge 1322. When the second vent pipe 131 supplies inert gas to the gas-liquid mixing tank 132, the inert gas first enters the gas storage space. As the gas pressure in the gas storage space increases and the second contact valve 230 opens, the lubricating oil adsorbed in the sponge 1322 mixes with the inert gas to obtain an inert mixture. The inert mixture is sprayed from the third vent pipe 133 into the air-jet control seat 240, and then sprayed from the nozzle at the outer end of the air-jet control seat 240 towards the filling gun and the filling pipe connecting pipe 112.

[0033] like Figure 6 The structure and operating principle of the piston control component 210 are described in detail below: The piston control component 210 includes a piston cylinder 2101 mounted on the first exhaust pipe 121 and a piston rod 2102 (which can also be understood as a cylinder) slidably fitted within the piston cylinder 2101. One end of the piston rod 2102 extends beyond one end of the piston cylinder 2101, approaching the first contact valve 220, and the extension and retraction of the piston rod 2102 can form a triggering relationship with the first contact valve 220. The gas recovered into the circulation tank 120 is used as the power to drive the piston control component 210 to trigger the opening of the first contact valve 220, reducing the need for power components. Since the relevant components are in a sealed environment, manual operation of the first contact valve 220 is not required, thus improving efficiency.

[0034] like Figure 2 , Figure 4 , Figure 5 as well as Figure 8As shown, the structure and operating principle of the pneumatic control base 240 are described as follows: First, an assembly hole is made on the body 10. The pneumatic control base 240 includes a base body 2401 locked and fixed in the assembly hole. A first through hole 2402 is passed through the eccentric position of the base body 2401. A trigger rod 2403 passes through the first through hole 2402. The inner end of the trigger rod 2403 enters the body 10 and forms a trigger relationship with the second contact valve 230. The outer end of the trigger rod 2403 is connected to a collection seat 2404. The 4 has a second through hole 2405, which surrounds the periphery of the filling pipe connecting pipe 112. The outer end of the collection seat 2404 has a chamfered surface 2406, and several nozzles 2407 are arranged in a ring on the chamfered surface 2406. The nozzles 2407 spray gas-liquid medium (gas-liquid mixture) toward the connecting pipe part of the filling pipe connecting pipe 112. The inner surface of the collection seat 2404 is connected to a flexible nozzle 2408, and the inner end of the flexible nozzle 2408 passes through the collection seat 2404 and is connected to the third gas outlet pipe 133. When the filling gun connects to the filling pipe connector 112, the outer end of the collection seat 2404 is squeezed by the antenna or rod, causing the collection seat 2404 to push the trigger rod 2403 inward. The inner end of the trigger rod 2403 triggers the second contact valve 230, opening the second contact valve 230. The third vent pipe 133 then discharges the gas-liquid mixture outward. The gas-liquid mixture is then discharged into the collection seat 2404 through the flexible nozzle 2408. After being collected by the collection seat 2404, it is finally sprayed onto the filling pipe connector 112 and the filling gun through the nozzle 2407 on the chamfered surface 2406, completing the automatic protection. The collection seat 2404 serves as both a spraying component and a power component that interacts with the filling gun by squeezing it and triggers the second contact valve 230 to open. It has a simple structure and combines the filling action and the gas-liquid mixture discharge action into a linkage, making operation simple and improving efficiency.

[0035] like Figure 2 , Figure 8 As shown, a third through hole 2409 is provided at the center of the base 2401, and the outer end of the filling pipe connecting tube 112 passes through the third through hole 2409 to the outside of the machine body 10. This structural arrangement and positional distribution of the filling pipe connecting tube 112 and the base 2401 (air-jet control base 240) ensures smooth linear movement of the base 2401 and positions the filling pipe connecting tube 112 at the axial center of the base 2401. When the base 2401 sprays the gas-liquid mixture, it can evenly spray it onto the friction points of the filling pipe connecting tube 112 and the filling gun, resulting in a more reasonable protective structure.

[0036] A partition plate 30 is provided above the inner cavity of the body 10, which divides the inner cavity of the body 10 into an upper partition 310 and a lower partition 320. An inert tank 130 is installed in the upper partition 310, and a filling tank 110, a circulation tank 120, and a gas-liquid mixing tank 132 are installed in the lower partition 320. A second vent pipe 131 on the inert tank 130 extends into the lower partition 320 and is connected to the gas-liquid mixing tank 132. A fifth vent pipe is also connected to the inert tank 130. A solenoid valve 40 located in the upper partition 310 is installed on the fifth vent pipe. A sensor array is installed in the lower partition 320. The sensor array includes at least a gas sensor and a smoke sensor. Each sensor is also matched and connected to an external third-party controller or control module. Risky components (filling tank 110 and circulation tank 120) are located in the lower compartment 320. Once they leak gas or spontaneously combust, the gas sensor or smoke sensor sends a signal to the controller or control module. The controller or control module controls the solenoid valve 40 to open automatically, and the inert gas in the inert tank 130 is injected into the lower compartment 320 at once to block the risk.

[0037] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0038] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A marine LNG refueling machine, characterized in that, The system includes a body (10) and a control assembly (20). The body (10) contains a filling tank (110), a circulation tank (120), and an inert tank (130). The filling tank (110) has a filling pipe (111) at its outlet end. The other end of the filling pipe (111) extends to the outside of the body (10) and is provided with a filling pipe connecting pipe (112). The circulation tank (120) has a first vent pipe (121). The control assembly (20) includes a piston control component (210) installed on the first vent pipe (121). The inert tank (130) is connected to a second vent pipe (131). The control assembly (20) includes a piston control component (210) installed on the second vent pipe (131). The control assembly (20) includes a first contact valve (220) that is triggered by the piston control component (210); a gas-liquid mixing tank (132) is connected to the second outlet pipe (131), and a third outlet pipe (133) is connected to the gas-liquid mixing tank (132). The control assembly (20) also includes a second contact valve (230) installed on the third outlet pipe (133). The control assembly (20) also includes a pneumatic spray control seat (240) located near the filling pipe connecting pipe (112). The inner end of the pneumatic spray control seat (240) enters the machine body (10) and is triggered by the second contact valve (230). The outer end of the pneumatic spray control seat (240) is provided with a spray hole. The machine body (10) has an assembly hole. The pneumatic control base (240) includes a base body (2401) that is locked and fixed in the assembly hole. A first through hole (2402) is passed through the eccentric position of the base body (2401). A trigger rod (2403) passes through the first through hole (2402). The inner end of the trigger rod (2403) enters the machine body (10) and forms a trigger relationship with the second contact valve (230). The outer end of the trigger rod (2403) is connected to a collection seat (2404). A second through hole (2403) is opened on the collection seat (2404). 5) The second through hole (2405) surrounds the periphery of the filling pipe connecting pipe (112). The outer end of the collection seat (2404) is provided with a chamfered surface (2406). Several nozzles (2407) are arranged in a ring array on the chamfered surface (2406). The nozzles (2407) spray gas-liquid medium toward the connecting pipe part of the filling pipe connecting pipe (112). The inner surface of the collection seat (2404) is connected to a flexible nozzle (2408). The inner end of the flexible nozzle (2408) passes through the collection seat (2404) and is connected to the third gas outlet pipe (133).

2. The marine LNG refueling machine according to claim 1, characterized in that, A compensation pipe (1321) is connected to the gas-liquid mixing tank (132). The gas-liquid mixing tank (132) is filled with a sponge (1322). The inlet of the compensation pipe (1321) is connected to the sponge (1322). The inlet of the second vent pipe (131) is located above the sponge (1322) and forms a gas storage space between it and the top of the sponge (1322). A spray seat (1323) is provided below the sponge (1322). One end of the third vent pipe (133) is connected to the spray seat (1323) inside the gas-liquid mixing tank (132).

3. A marine LNG refueling machine according to claim 2, characterized in that, The air intake pipes of the filling tank (110), the circulation tank (120) and the inert tank (130) extend outside the machine body (10) and are respectively connected to the steam source.

4. A marine LNG refueling machine according to claim 3, characterized in that, The circulating tank (120) is also equipped with a fourth exhaust pipe (122), the other end of which extends outside the body (10) and is equipped with a delay valve (123).

5. A marine LNG refueling machine according to claim 4, characterized in that, The piston control unit (210) includes a piston cylinder (2101) mounted on the first exhaust pipe (121) and a piston rod (2102) slidably fitted inside the piston cylinder (2101). One end of the piston rod (2102) extends beyond one end of the piston cylinder (2101) and approaches the first contact valve (220). When the piston rod (2102) extends or retracts, it can form a trigger relationship with the first contact valve (220).

6. A marine LNG refueling machine according to claim 5, characterized in that, A third through hole (2409) is provided at the center of the base (2401), and the filling pipe and connecting pipe (112) pass through the third through hole (2409).

7. A marine LNG refueling machine according to claim 6, characterized in that, A partition plate (30) is provided above the inner cavity of the body (10). The partition plate (30) divides the inner cavity of the body (10) into an upper partition (310) and a lower partition (320). An inert tank (130) is installed in the upper partition (310). A filling tank (110), a circulation tank (120) and a gas-liquid mixing tank (132) are installed in the lower partition (320). A second vent pipe (131) on the inert tank (130) extends into the lower partition (320) and is connected to the gas-liquid mixing tank (132). A fifth vent pipe (134) is also connected to the inert tank (130). A solenoid valve (40) located in the upper partition (310) is installed on the fifth vent pipe (134). A sensor array is installed in the lower partition (320). The sensor array includes at least a gas sensor and a smoke sensor.

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