LNG (Liquefied Natural Gas) filling equipment and filling method

Abstract

The invention relates to the technical field of LNG filling, and discloses LNG filling equipment and a filling method, the LNG filling equipment comprises a gun body, a liquid adding valve core is arranged at one end of the gun body, a liquid inlet valve core is arranged at the front end of the liquid adding valve core, and a handle is arranged outside the gun body. After the liquid inlet valve element blocks the gun body, the spiral linear driving mechanism starts to drive the pressure relief mechanism to be started, at the moment, the liquid adding valve element is in an open state, the part, located at a filling port of equipment to be filled with LNG, of the gun body and residual LNG in the gun body are discharged through the pressure relief mechanism, and then the residual LNG in the gun body is in a rarefied state; along with the movement of the spiral linear driving mechanism, the pressure relief mechanism is always in an open state, the liquid adding valve element starts to be closed, the gun body is taken down from the device to be filled with the LNG until the liquid adding valve element is completely closed, the LNG filling work is completed, and in the process, the situation that at the moment of separation after filling is finished, the residual LNG in the filling port is gasified and pressurized to cause injection is avoided. And the danger cannot be eliminated in time.

Description

Technical Field

[0001] This invention relates to the field of LNG refueling technology, specifically to an LNG refueling device and refueling method. Background Technology

[0002] Liquefied natural gas (LNG), as a clean energy source, is increasingly widely used in transportation, industrial fuel, and other fields. LNG refueling equipment is a key device for the safe delivery of LNG to storage tanks or vehicles, and its performance directly affects refueling efficiency, operational safety, and environmental compatibility. Currently, common LNG refueling nozzles typically control the opening and closing of the valve core manually or electrically to complete the refueling process.

[0003] However, existing LNG refueling equipment has some significant problems. After refueling is completed, when the refueling gun is separated from the equipment interface, the LNG remaining in the refueling port and gun body will rapidly vaporize due to the increase in external temperature, resulting in a sudden increase in local pressure, which can easily cause LNG injection and create safety hazards. In addition, the valve core control of traditional refueling guns is mostly operated independently, and the coordination between the liquid inlet and the refueling valve is poor, which can easily lead to leakage due to incorrect operation sequence or poor sealing. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an LNG refueling device and method. When the inlet valve core seals the nozzle, a helical linear drive mechanism activates a pressure relief mechanism. At this time, the inlet valve core is open, and residual LNG at the nozzle and the LNG refueling port of the device, as well as inside the nozzle, is discharged through the pressure relief mechanism, thus diluting the LNG inside the nozzle. Then, as the helical linear drive mechanism moves, the pressure relief mechanism remains open, while the inlet valve core begins to close. Once the inlet valve core is fully closed, the nozzle is moved from the LNG refueling port. The NG equipment is removed to complete the LNG refueling process. This process avoids the risk of residual LNG vaporizing and pressurizing at the refueling port at the moment of separation after refueling, which could lead to a jetting and prevent timely elimination of danger. It also solves the problem that after refueling, when the refueling gun is separated from the equipment interface, the LNG remaining in the refueling port and gun body will rapidly vaporize due to the increase in external temperature, causing a sudden increase in local pressure and easily leading to LNG jetting, which poses a safety hazard. In addition, the valve core control of traditional refueling guns is mostly operated independently, and the coordination between the liquid inlet and refueling valves is poor, which can easily lead to leakage due to incorrect operation sequence or poor sealing.

[0005] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides the following technical solution: an LNG refueling device, including a gun body, a liquid filling valve core is provided at one end of the gun body, an inlet valve core is provided at the front end of the liquid filling valve core, a handle is provided on the outside of the gun body, the handle is used to drive the liquid filling valve core and the inlet valve core, a helical linear drive mechanism is provided between the gun body and the inlet valve core, a liquid filling drive groove is provided at the front end of the helical linear drive mechanism, a locking drive ring is provided at the tail end of the helical linear drive mechanism, and a pressure relief mechanism is provided on one side of the gun body; the helical linear drive mechanism drives the inlet valve core to move towards the front end of the gun body, the inlet valve core drives the pressure relief mechanism to close, the liquid filling valve core moves synchronously, and after the liquid filling valve core is opened, the inlet valve core is opened accordingly.

[0006] Preferably, the gun body includes a filling end and a receiving end, the filling valve core is located inside the filling end, the liquid inlet valve core is located inside the receiving end, the spiral linear drive mechanism is located between the receiving end and the liquid inlet valve core, and a connecting pipe is provided at the tail of the receiving end.

[0007] Preferably, the helical linear drive mechanism includes a drive sleeve and an inner slider. The drive sleeve is sleeved outside the liquid receiving end and is rotatably positioned between the drive sleeve and the liquid receiving end. The inner slider is located inside the liquid receiving end. A helical groove is formed on the inner wall of the drive sleeve, and a vertical sliding groove is formed on the side of the liquid receiving end. A guide protrusion is provided at one end of the inner slider. The guide protrusion is located in the vertical sliding groove and extends into the helical groove. The liquid inlet valve core is located at the other end of the inner slider.

[0008] Preferably, the inner slider includes a front slider and a rear slider, which are rotatably connected. The front slider is linearly slidably connected to the inside of the liquid receiving end. The connection between the front slider and the rear slider is crossed, and the rear slider has a tendency to deflect to one side. When the rear slider deflects to one side, the front slider and the rear slider are misaligned and separated. A cylinder is provided in the middle of the front slider. After the rear slider is separated from the front slider, it extends into the cylinder. A liquid filling connecting rod is provided at the front end of the rear slider. The liquid filling connecting rod passes through the front slider and extends to connect with the liquid filling valve core.

[0009] Preferably, the liquid-filling drive groove is located on the liquid-receiving end and communicates with the vertical slide groove, and the locking drive ring is located at the other end of the liquid-receiving end and communicates with the vertical slide groove; when the guide protrusion at one end of the inner slider moves along the vertical slide groove into the liquid-filling drive groove, the rear slider deflects relative to the front slider, and the rear slider extends into the cylinder; when the guide protrusion at one end of the inner slider moves along the vertical slide groove into the locking drive ring, the guide protrusion is restricted by the locking drive ring and cannot move along the axis of the drive sleeve.

[0010] Preferably, the liquid adding connecting rod is slidably disconnected in the middle, and is respectively a driven end and an active end. The driven end is connected to the liquid adding valve core, and the active end is connected to the rear slider. The driven end and the active end are two interlocking movable slots, and each movable slot has a locking point at its end, and the two locking points are arranged to abut against each other.

[0011] Preferably, a linkage spring is provided at the front end of the liquid inlet valve core, and the other end of the linkage spring is connected to the liquid filling valve core. The liquid filling valve core includes a perforated baffle, a closed valve plate, and a drive rod. The perforated baffle is connected to the linkage spring, the closed valve plate is located on the other side of the perforated baffle, the drive rod is located in the middle of the closed valve plate, and the other end of the drive rod passes through the middle of the perforated baffle and is connected to the liquid filling connecting rod.

[0012] Preferably, the inlet valve core includes a valve stem, a valve core cone, and a seal. The valve stem is located on one side of the inner slider, and the valve core cone is located on the other side of the valve stem. The conical surface of the valve core cone is positioned opposite the port of the receiving end. A receiving tube is provided inside the receiving end, and the valve stem is located inside the receiving tube. A sealing surface is provided at the front end of the receiving tube. The valve core cone is opposite to the sealing surface, and the seal is located between the valve core cone and the sealing surface.

[0013] Preferably, the pressure relief mechanism includes a pressure relief outer pipe, a pressure relief valve, and a pressure relief drive wheel. The pressure relief outer pipe is connected to the inner cavity of the gun body. The pressure relief valve is located between the pressure relief outer pipe and the gun body. The pressure relief drive wheel is located on one side of the pressure relief valve. A linkage rod is provided at the front end of the inner slider. Teeth are provided on the side of the linkage rod. The pressure relief drive wheel is engaged with the teeth.

[0014] A refueling method using the aforementioned LNG refueling equipment.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides an LNG refueling device and a refueling method, which have the following beneficial effects: 1. This LNG refueling equipment and method uses an inlet valve core to control the LNG inlet to the nozzle, and a filling valve core to control the LNG filling. First, the handle is rotated on the outside of the nozzle, causing a helical linear drive mechanism to move the inlet valve core towards the filling valve core. The helical linear drive mechanism then closes the pressure relief mechanism to prevent leakage from the pressure relief mechanism after the filling and inlet valve cores are opened. As the helical linear drive mechanism continues to operate, when it reaches the filling drive chute, the pressure relief mechanism is completely closed, and the inlet valve core opens, allowing LNG to be supplied into the nozzle. Under the action of the filling drive chute, the helical linear drive mechanism initially only drives the filling valve core, connecting the LNG filling port of the equipment to be refueled with the inside of the nozzle. After refueling is complete, the LNG filling port of the equipment to be refueled is first closed. The switch is activated, and then the helical linear drive mechanism first drives the inlet valve core to reset. At this time, the filling valve core does not move with the inlet valve core. After the inlet valve core blocks the gun body, the helical linear drive mechanism starts to drive the pressure relief mechanism to open. At this time, the filling valve core is in the open state. The LNG at the filling port of the equipment to be filled with LNG and the LNG remaining inside the gun body are discharged through the pressure relief mechanism, thereby making the LNG remaining inside the gun body in a dilute state. Then, as the helical linear drive mechanism moves, the pressure relief mechanism always remains in the open state, while the filling valve core begins to close. After the filling valve core is completely closed, the gun body is removed from the equipment to be filled with LNG, and the LNG filling work is completed. This process avoids the situation where the residual LNG at the filling port vaporizes and pressurizes at the moment of separation after filling, causing a jet and making it impossible to eliminate the danger in time.

[0016] 2. The LNG refueling equipment and method utilize a drive sleeve in a spiral linear drive mechanism. Driven by the handle (which is fixedly connected to the outside of the drive sleeve), the spiral groove on the inner wall of the drive sleeve drives the guide protrusion on the inner slider to move. The guide protrusion moves linearly under the constraint of the vertical groove, thereby causing the inner slider to move the liquid inlet valve core. The front and rear sliders in the inner slider can be separated. After the pressure relief mechanism is completely closed, when the spiral linear drive mechanism is required to drive only the liquid inlet valve core, the rear slider deflects to one side and separates from the front slider. Then, the rear slider can move forward independently. The cylinder on the front slider allows the rear slider to move towards the cylinder, thereby causing the liquid inlet connecting rod at the front end of the rear slider to delay the opening of the liquid inlet valve core.

[0017] 3. In this LNG refueling equipment and method, the liquid-fueling drive chute is located at one end of the spiral groove. When the guide protrusion on the inner slider is acted upon by the spiral groove and moves from the vertical groove to the position of the liquid-fueling drive chute (i.e., the pressure relief mechanism is fully closed), the front slider in the inner slider stops operating, and the rear slider begins to deflect and offset from the front slider. Under the restriction of the liquid-fueling drive chute, the guide protrusion on the rear slider moves forward along the liquid-fueling drive chute, causing the rear slider to deflect and extend into the cylinder in the middle of the front slider. When the locking drive ring is located at the other end of the spiral groove, when the guide protrusion on the inner slider moves from the vertical groove to the position of the locking drive ring (i.e., after the refueling task is completed), the guide protrusion on the inner slider is restricted by the locking drive ring, preventing the inner slider from moving linearly.

[0018] 4. The LNG refueling equipment and method, through the sliding disconnection setting in the middle of the refueling connecting rod, when the inner slider moves forward under the action of the spiral groove, the locking point on the active end moves to the end of the movable locking groove on the passive end, and the locking point on the active end pushes the passive end to move forward; when the inner slider moves backward under the action of the spiral groove, the locking point on the active end moves in the movable locking groove on the passive end until it moves to the locking point on the passive end, and the locking point on the active end pulls the locking point on the passive end, so that when the active end moves backward, the passive end follows with a delay. Attached Figure Description

[0019] Figure 1 This is one of the overall three-dimensional structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall three-dimensional structure of the present invention; Figure 3 This is one of the schematic diagrams of the internal structure of the gun body of the present invention; Figure 4 This is the second schematic diagram of the internal structure of the gun body of the present invention; Figure 5 This is a three-dimensional structural diagram of the liquid receiving end portion of the present invention; Figure 6 This is a schematic diagram of the internal structure of the liquid receiving end portion of the present invention; Figure 7 This is one of the schematic diagrams of the internal exploded structure of the liquid receiving end portion of the present invention; Figure 8 This is the second schematic diagram of the internal explosion structure of the liquid receiving end portion of the present invention; Figure 9 This is a schematic diagram of the internal structure of the filling end portion of the present invention; Figure 10 This is one of the internal exploded structural diagrams of the filling end portion of the present invention; Figure 11This is the second schematic diagram of the internal exploded structure of the filling end portion of the present invention.

[0020] In the diagram: 1. Gun body; 11. Filling end; 12. Receiving end; 13. Connecting pipe; 15. Vertical slide groove; 16. Receiving pipe; 17. Sealing surface; 2. Filling valve core; 21. Perforated baffle; 22. Sealing valve plate; 23. Drive rod; 3. Inlet valve core; 31. Valve stem; 32. Valve core cone; 33. Sealing element; 4. Handle; 5. Helical linear drive mechanism; 51. Drive sleeve; 52. Inner slider; 53. Screw 54. Rotary groove; 55. Guide protrusion; 56. Linkage spring; 521. Front slider; 522. Rear slider; 523. Cylinder; 524. Liquid filling connecting rod; 525. Driven end; 526. Driven end; 527. Movable slot; 528. Locking point; 6. Liquid filling drive inclined groove; 7. Locking drive ring; 8. Pressure relief mechanism; 81. Pressure relief external pipe; 82. Pressure relief valve; 83. Pressure relief drive wheel; 9. Linkage rod; 91. Tooth. Detailed Implementation

[0021] The technical solutions of the embodiments 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-11 An LNG refueling device includes a gun body 1, a liquid filling valve core 2 at one end of the gun body 1, an inlet valve core 3 at the front end of the liquid filling valve core 2, a handle 4 on the outside of the gun body 1 for driving the liquid filling valve core 2 and the inlet valve core 3, a helical linear drive mechanism 5 between the gun body 1 and the inlet valve core 3, a liquid filling drive groove 6 at the front end of the helical linear drive mechanism 5, a locking drive ring 7 at the tail end of the helical linear drive mechanism 5, and a pressure relief mechanism 8 on one side of the gun body 1. The helical linear drive mechanism 5 drives the inlet valve core 3 to move towards the front end of the gun body 1, the inlet valve core 3 drives the pressure relief mechanism 8 to close, the liquid filling valve core 2 moves synchronously, and after the liquid filling valve core 2 is opened, the inlet valve core 3 is opened accordingly.

[0023] In use, first connect the end of the gun body 1 near the liquid filling valve core 2 to the LNG filling port of the equipment to be filled. After connection, open the switch at the filling port to connect the equipment to be filled with LNG to one end of the gun body 1. Then, control the liquid inlet of the gun body 1 through the liquid inlet valve core 3 and control the LNG filling of the gun body 1 through the liquid filling valve core 2. First, rotate the handle 4 on the outside of the gun body 1 to make the spiral linear drive mechanism 5 drive the liquid inlet valve core 3 to move towards the liquid filling valve core 2. The spiral linear drive mechanism 5 drives the pressure relief mechanism 8 to close, preventing leakage from the pressure relief mechanism 8 after the liquid filling valve core 2 and the liquid inlet valve core 3 are opened. As the spiral linear drive mechanism 5 continues to operate, when the spiral linear drive mechanism 5 moves to the liquid filling drive chute 6, the pressure relief mechanism 8 is completely closed, the liquid inlet valve core 3 is opened, and the LNG filling supply enters the gun body 1. Under the action of the liquid filling drive chute 6, the spiral linear drive mechanism 5 initially only drives the liquid filling valve core 2 to move, so that the LNG filling port of the equipment to be filled is connected to the liquid filling valve core 2. The gun body 1 is internally connected. After refueling, the switch at the refueling port of the equipment to be refueled with LNG is first closed. Then, the spiral linear drive mechanism 5 first drives the liquid inlet valve core 3 to reset. At this time, the liquid inlet valve core 2 does not move with the liquid inlet valve core 3. After the liquid inlet valve core 3 blocks the gun body 1, the spiral linear drive mechanism 5 starts to drive the pressure relief mechanism 8 to open. At this time, the liquid inlet valve core 2 is in the open state. The part located at the gun body 1 and the refueling port of the equipment to be refueled with LNG, as well as the LNG remaining inside the gun body 1, are discharged through the pressure relief mechanism 8, thereby making the LNG remaining inside the gun body 1 in a dilute state. Then, as the spiral linear drive mechanism 5 moves, the pressure relief mechanism 8 is always in the open state, while the liquid inlet valve core 2 begins to close. After the liquid inlet valve core 2 is completely closed, the gun body 1 is removed from the equipment to be refueled with LNG, and the LNG refueling work is completed. This process avoids the situation where the residual LNG at the refueling port vaporizes and pressurizes at the moment of separation after refueling, causing a jet and making it impossible to eliminate the danger in time.

[0024] Furthermore, the gun body 1 includes a filling end 11 and a receiving end 12. The filling valve core 2 is located inside the filling end 11, the inlet valve core 3 is located inside the receiving end 12, and the spiral linear drive mechanism 5 is located between the receiving end 12 and the inlet valve core 3. A connecting pipe 13 extends from the tail of the receiving end 12. The filling end 11 in the gun body 1 is connected to the filling port of the LNG-to-be-filled equipment, so that the gun body 1 is connected to the equipment to be filled. The receiving end 12 at the other end serves as one end connected to the LNG storage equipment, providing LNG to the gun body 1. By using the filling valve core 2 and the inlet valve core 3 respectively provided at the filling end 11 and the receiving end 12, the discharge of the equipment to be filled and the LNG storage equipment before and after filling is controlled separately, so as to avoid LNG leakage.

[0025] Further, the spiral linear drive mechanism 5 includes a drive sleeve 51 and an inner slider 52. The drive sleeve 51 is sleeved on the outside of the liquid receiving end 12, and the drive sleeve 51 is rotatably positioned at a fixed point relative to the liquid receiving end 12. The inner slider 52 is located inside the liquid receiving end 12. A spiral groove 53 is formed on the inner wall of the drive sleeve 51, and a vertical groove 15 is formed on the side of the liquid receiving end 12. A guide protrusion 54 is provided at one end of the inner slider 52. The guide protrusion 54 is located at the... The liquid inlet valve core 3 is located at the other end of the inner slider 52 within the vertical slide groove 15 and extending into the spiral groove 53. Through the drive sleeve 51 in the spiral linear drive mechanism 5, driven by the handle 4 (the handle 4 is fixedly connected to the outside of the drive sleeve 51), the spiral groove 53 opened on the inner wall of the drive sleeve 51 drives the guide protrusion 54 on the inner slider 52 to move. Under the restriction of the vertical slide groove 15, the guide protrusion 54 makes linear motion, thereby causing the inner slider 52 to drive the liquid inlet valve core 3 to move.

[0026] Further, the inner slider 52 includes a front slider 521 and a rear slider 522, which are rotatably connected. The front slider 521 is linearly slidably connected to the inside of the liquid receiving end 12. The connection points of the front slider 521 and the rear slider 522 are intersected, and the rear slider 522 has a tendency to deflect to one side. When the rear slider 522 deflects to one side, the front slider 521 and the rear slider 522 are misaligned and separated. A cylinder 523 is provided in the middle of the front slider 521. After the rear slider 522 separates from the front slider 521, it extends into the cylinder 523. The front end of the rear slider 522... A liquid-filling connecting rod 524 is provided, which passes through the front slider 521 and extends to connect with the liquid-filling valve core 2. The front slider 521 and the rear slider 522 in the inner slider 52 can be separated. After the pressure relief mechanism 8 is completely closed, when the spiral linear drive mechanism 5 is required to drive the liquid-filling valve core 2 to move, the rear slider 522 deflects to one side and is misaligned with the front slider 521. Then the rear slider 522 can move forward alone. The cylinder 523 on the front slider 521 allows the rear slider 522 to move towards the cylinder 523, thereby causing the liquid-filling connecting rod 524 at the front end of the rear slider 522 to drive the liquid-filling valve core 2 to open with a delay.

[0027] Further, the liquid-filling drive groove 6 is located on the liquid-receiving end 12 and communicates with the vertical slide groove 15; the locking drive ring 7 is located at the other end of the liquid-receiving end 12 and communicates with the vertical slide groove 15; when the guide protrusion 54 at one end of the inner slider 52 moves along the vertical slide groove 15 into the liquid-filling drive groove 6, the rear slider 522 deflects relative to the front slider 521, and the rear slider 522 extends into the cylinder 523; when the guide protrusion 54 at one end of the inner slider 52 moves along the vertical slide groove 15 into the locking drive ring 7, the guide protrusion 54 is restricted by the locking drive ring 7 and cannot move along the axial direction of the drive sleeve 51; because the liquid-filling drive groove 6 is located at one end of the spiral groove 53, when the guide protrusion 54 on the inner slider 52 is subjected to the spiral groove 53... When the slider moves from the vertical slide 15 to the position of the liquid filling drive sloping groove 6 (i.e., the pressure relief mechanism 8 is completely closed), the front slider 521 in the inner slider 52 stops operating, and the rear slider 522 begins to deflect and is offset from the front slider 521. Under the restriction of the liquid filling drive sloping groove 6, the guide protrusion 54 on the rear slider 522 moves forward while driving the rear slider 522 to deflect along the liquid filling drive sloping groove 6, thereby causing the rear slider 522 to extend into the cylinder 523 in the middle of the front slider 521. When the locking drive ring 7 is located at the other end of the spiral groove 53, when the guide protrusion 54 on the inner slider 52 moves from the vertical slide 15 to the position of the locking drive ring 7 along the spiral groove 53 (i.e., after the filling task is completed), the guide protrusion 54 on the inner slider 52 is restricted by the locking drive ring 7, so that the inner slider 52 cannot move in a straight line.

[0028] Furthermore, the liquid-filling connecting rod 524 is slidably disconnected in the middle, and consists of a driven end 525 and an active end 526. The driven end 525 is connected to the liquid-filling valve core 2, and the active end 526 is connected to the rear slider 522. The driven end 525 and the active end 526 are two interlocking movable slots 527, and each movable slot 527 has a locking point 528 at its end, with the two locking points 528 abutting against each other. Due to the slidable disconnection in the middle of the liquid-filling connecting rod 524, when the inner slider 52 moves towards the spiral groove 53... When moving forward, the locking point 528 on the driving end 526 moves to the end of the movable slot 527 on the driven end 525, and the locking point 528 on the driving end 526 pushes the driven end 525 forward; when the inner slider 52 moves backward under the action of the spiral groove 53, the locking point 528 on the driving end 526 moves in the movable slot 527 on the driven end 525 until it moves to the locking point 528 on the driven end 525, and the locking point 528 on the driving end 526 pulls the locking point 528 on the driven end 525, so that when the driving end 526 moves backward, the driven end 525 follows with a delay.

[0029] Furthermore, a linkage spring 55 is provided at the front end of the liquid inlet valve core 3, and the other end of the linkage spring 55 is connected to the liquid filling valve core 2. The liquid filling valve core 2 includes a perforated baffle 21, a closed valve plate 22, and a drive rod 23. The perforated baffle 21 is connected to the linkage spring 55, the closed valve plate 22 is located on the other side of the perforated baffle 21, and the drive rod 23 is located in the middle of the closed valve plate 22. The other end of the drive rod 23 passes through the middle of the perforated baffle 21 and is connected to the liquid filling connecting rod 524. Through the linkage spring 55 provided at the front end of the inner slider 52, when the inner slider 52 moves forward under the action of the spiral groove 53, the inner slider... Block 52 pushes the linkage spring 55 to compress, and the compressed linkage spring 55 pushes the perforated baffle 21 in the liquid filling valve core 2 to move forward. The perforated baffle 21 pushes the sealing valve plate 22 to move together. When the inner slider 52 moves backward under the action of the spiral groove 53, the inner slider 52 pulls the linkage spring 55 to move backward, and the linkage spring 55 pulls the perforated baffle 21 in the liquid filling valve core 2 to move backward. At this time, the sealing valve plate 22 will not move and the sealing valve plate 22 will still be separated from the perforated baffle 21. Then, the LNG residue in the filling port of the equipment to be filled with LNG will be released from the pressure relief mechanism 8 through the perforated baffle 21 along with the LNG residue in the gun body 1.

[0030] Furthermore, the inlet valve core 3 includes a valve stem 31, a valve core cone 32, and a sealing element 33. The valve stem 31 is located on one side of the inner slider 52, and the valve core cone 32 is located on the other side of the valve stem 31. The conical surface of the valve core cone 32 is positioned facing the port of the receiving end 12. A receiving tube 16 is provided inside the receiving end 12, and the valve stem 31 is located inside the receiving tube 16. A sealing surface 17 is provided at the front end of the receiving tube 16. The valve core cone 32 is opposite to the sealing surface 17, and the sealing element 33 is located between the valve core cone 32 and the sealing surface 17. Through the cooperation between the valve stem 31 and the receiving tube 16 in the inlet valve core 3, when the inner slider 52 moves forward under the action of the spiral groove 53 and pushes the valve stem 31 to move, even if the valve core cone 32 separates from the sealing surface 17, the valve stem 31 can still be used in conjunction with the receiving tube 16 to seal the receiving end 12.

[0031] Furthermore, the pressure relief mechanism 8 includes a pressure relief external pipe 81, a pressure relief valve 82, and a pressure relief drive wheel 83. The pressure relief external pipe 81 is connected to the inner cavity of the gun body 1. The pressure relief valve 82 is located between the pressure relief external pipe 81 and the gun body 1. The pressure relief drive wheel 83 is located on one side of the pressure relief valve 82. A linkage rod 9 is provided at the front end of the inner slider 52, and teeth 91 are provided on the side of the linkage rod 9. The pressure relief drive wheel 83 is engaged with the teeth 91. The pressure relief drive wheel 83 in the pressure relief mechanism 8 controls the opening of the pressure relief valve 82 under the drive of the linkage rod 9 and the teeth 91. When the inner slider 52 moves forward, the pressure relief valve 82 closes. When the inner slider 52 moves backward, the pressure relief valve 82 opens.

[0032] A refueling method using the aforementioned LNG refueling equipment.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LNG refueling device, comprising a gun body, wherein a liquid filling valve core is disposed at one end of the gun body, an inlet valve core is disposed at the front end of the liquid filling valve core, and a handle is disposed on the outside of the gun body, the handle being used to drive the liquid filling valve core and the inlet valve core, characterized in that: A helical linear drive mechanism is provided between the gun body and the liquid inlet valve core. The front end of the helical linear drive mechanism is provided with a liquid filling drive groove, and the rear end of the helical linear drive mechanism is provided with a locking drive ring. A pressure relief mechanism is provided on one side of the gun body. The helical linear drive mechanism drives the liquid inlet valve core to move towards the front end of the gun body. The liquid inlet valve core drives the pressure relief mechanism to close. The liquid filling valve core moves synchronously. After the liquid filling valve core is opened, the liquid inlet valve core is opened accordingly.

2. The LNG refueling equipment according to claim 1, characterized in that: The gun body includes a filling end and a receiving end. The filling valve core is located inside the filling end, the receiving valve core is located inside the receiving end, the spiral linear drive mechanism is located between the receiving end and the receiving valve core, and a connecting pipe is provided at the tail of the receiving end.

3. The LNG refueling equipment according to claim 2, characterized in that: The spiral linear drive mechanism includes a drive sleeve and an inner slider. The drive sleeve is sleeved outside the liquid receiving end and is fixedly rotatably positioned between the drive sleeve and the liquid receiving end. The inner slider is located inside the liquid receiving end. A spiral groove is formed on the inner wall of the drive sleeve, and a vertical sliding groove is formed on the side of the liquid receiving end. A guide protrusion is provided at one end of the inner slider. The guide protrusion is located in the vertical sliding groove and extends into the spiral groove. The liquid inlet valve core is located at the other end of the inner slider.

4. An LNG refueling device according to claim 3, characterized in that: The inner slider includes a front slider and a rear slider, which are rotatably connected. The front slider is linearly slidably connected to the inside of the liquid receiving end. The connection between the front slider and the rear slider is crossed, and the rear slider has a tendency to deflect to one side. When the rear slider deflects to one side, the front slider and the rear slider are misaligned and separated. A cylinder is provided in the middle of the front slider. After the rear slider is separated from the front slider, it extends into the cylinder. A liquid filling connecting rod is provided at the front end of the rear slider. The liquid filling connecting rod passes through the front slider and extends to connect with the liquid filling valve core.

5. An LNG refueling device according to claim 4, characterized in that: The liquid-filling drive groove is located on the liquid-receiving end and communicates with the vertical slide groove. The locking drive ring is located at the other end of the liquid-receiving end and communicates with the vertical slide groove. When the guide protrusion at one end of the inner slider moves along the vertical slide groove into the liquid-filling drive groove, the rear slider deflects relative to the front slider and extends into the cylinder. When the guide protrusion at one end of the inner slider moves along the vertical slide groove into the locking drive ring, the guide protrusion is restricted by the locking drive ring and cannot move along the axis of the drive sleeve.

6. An LNG refueling device according to claim 4, characterized in that: The liquid filling connecting rod is slidably disconnected in the middle, and is respectively a driven end and an active end. The driven end is connected to the liquid filling valve core, and the active end is connected to the rear slider. The driven end and the active end are two interlocking movable slots, and each movable slot has a locking point at its end, and the two locking points are arranged to abut against each other.

7. An LNG refueling device according to claim 4, characterized in that: A linkage spring is provided at the front end of the liquid inlet valve core, and the other end of the linkage spring is connected to the liquid filling valve core. The liquid filling valve core includes a perforated baffle, a closed valve plate, and a drive rod. The perforated baffle is connected to the linkage spring, the closed valve plate is located on the other side of the perforated baffle, the drive rod is located in the middle of the closed valve plate, and the other end of the drive rod passes through the middle of the perforated baffle and is connected to the liquid filling connecting rod.

8. An LNG refueling device according to claim 3, characterized in that: The inlet valve core includes a valve stem, a valve core cone, and a seal. The valve stem is located on one side of the inner slider, and the valve core cone is located on the other side of the valve stem. The conical surface of the valve core cone is positioned opposite the port of the receiving end. A receiving tube is provided inside the receiving end, and the valve stem is located inside the receiving tube. A sealing surface is provided at the front end of the receiving tube. The valve core cone is opposite to the sealing surface, and the seal is located between the valve core cone and the sealing surface.

9. An LNG refueling device according to claim 7, characterized in that: The pressure relief mechanism includes a pressure relief outer pipe, a pressure relief valve, and a pressure relief drive wheel. The pressure relief outer pipe is connected to the inner cavity of the gun body. The pressure relief valve is located between the pressure relief outer pipe and the gun body. The pressure relief drive wheel is located on one side of the pressure relief valve. A linkage rod is provided at the front end of the inner slider. Teeth are provided on the side of the linkage rod. The pressure relief drive wheel is engaged with the teeth.

10. A method for adding fuel, characterized in that, The LNG refueling equipment described in any one of claims 1-9 is used.

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