A pneumatic control device for LNG tank container

Abstract

This utility model discloses a pneumatic control device for an LNG tank container, including a control valve. One end of the control valve is mounted on the tank body, and a handle is installed on the control valve. Turning the handle opens and closes the control valve. The other end of the control valve is connected to a gas guide pipe, which is wrapped with a protective tube. A pneumatic actuator is installed on the protective tube. When the gas guide pipe leaks, the pressure inside the protective tube increases, and the pneumatic actuator rotates the handle. The beneficial effect of this utility model is that the protective tube protects the gas guide pipe. When the gas guide pipe leaks, gas enters the inside of the protective tube, increasing the pressure inside. Then, the pneumatic actuator rotates the handle of the control valve, automatically closing the control valve and preventing natural gas leakage, thus reducing safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of natural gas transportation equipment technology, and more specifically, to a pneumatic control device for LNG tank container. Background Technology

[0002] In recent years, with the adjustment of my country's energy structure, liquefied natural gas (LNG) has gradually become known as an economical, green, environmentally friendly, and safe new energy source. During the storage, transportation, and use of LNG, safety accidents such as fires and leaks may occur, requiring the use of emergency shut-off valves to cut off the natural gas in the tank.

[0003] In the current technology, when natural gas leaks, the valve needs to be closed. Generally, the valve needs to be closed manually or by electromechanical equipment, which poses certain safety hazards. In addition, the leak needs to be detected, which is inconvenient. Utility Model Content

[0004] The purpose of this invention is to solve the problem of inconvenient automatic shut-off after a natural gas leak, and to design a pneumatic control device for an LNG tank container.

[0005] To achieve the above objectives, the technical solution of this utility model is a pneumatic control device for an LNG tank container, comprising a control valve, one end of which is mounted on the tank body, and a twist handle is installed on the control valve. By rotating the twist handle, the control valve can be opened and closed. The other end of the control valve is connected to a gas guide pipe, and a protective tube is wrapped around the outside of the gas guide pipe. A pneumatic pusher is installed on the protective tube. If the gas guide pipe leaks, the pressure inside the protective tube will increase, and the twist handle will be rotated by the pneumatic pusher.

[0006] Furthermore, multiple support blocks are installed inside the protective tube, one end of each support block is connected to the air guide tube, and circular baffles are installed at both ends of the protective tube, with the inner side of each circular baffle connected to the air guide tube.

[0007] Furthermore, the pneumatic pusher includes a circular rigid channel fitted onto the outer side of one end of the protective tube. The circular rigid channel is connected to the protective tube via a support rod. A first movable piston is provided inside the circular rigid channel. The first movable piston and one side surface of the circular rigid channel are connected by multiple telescopic springs. The protective tube and the circular rigid channel are connected via a connecting pipe. A push rod is installed on one side surface of the first movable piston. One end of the circular rigid channel has an inlet and outlet. One end of the push rod extends through the inlet and outlet to the outer side of the circular rigid channel. A movable rack is installed on one end of the push rod. A rotating gear is installed on the rotating end of the twist handle. The movable rack and the rotating gear mesh.

[0008] Furthermore, a detection valve is installed on one side of the control valve and mounted on the tank body, and a detection tube is installed at one end of the protective tube, with one end of the detection tube connected to the detection valve.

[0009] Furthermore, a second movable piston is installed inside the detection tube, and an annular positioning plate installed inside the detection tube is provided on one side of the second movable piston.

[0010] The beneficial effects of this utility model are as follows: the gas pipe is protected by the protective pipe. When the gas pipe leaks, gas can enter the inside of the protective pipe, thereby increasing the gas pressure inside the protective pipe. Then, the control valve can be turned by the pneumatic pusher, which can automatically close the control valve, thereby preventing natural gas leakage and reducing safety hazards. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the pneumatic control device for an LNG tank container described in this utility model; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 yes Figure 1 A magnified view of a section at point B in the middle; Figure 4 This is a schematic diagram showing the connection relationship between the air guide tube, the protective tube, and the circular rigid channel described in this utility model; In the diagram, 1. Control valve; 2. Twist handle; 3. Air guide pipe; 4. Protective pipe; 5. Pneumatic push frame; 6. Support block; 7. Circular baffle; 8. Circular rigid channel; 9. Support rod; 10. First moving piston; 11. Telescopic spring; 12. Connecting pipe; 13. Push rod; 14. Inlet and outlet; 15. Moving rack; 16. Rotating gear; 17. Detection valve; 18. Detection pipe; 19. Second moving piston; 20. Circular positioning plate. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0013] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0014] This utility model provides, for example Figure 1-4 The LNG tank container pneumatic control device shown includes a control valve 1, one end of which is mounted on the tank body. A twist handle 2 is installed on the control valve 1. The control valve 1 can be opened or closed by rotating the twist handle 2. The other end of the control valve 1 is connected to a gas guide pipe 3. A protective pipe 4 is wrapped around the outside of the gas guide pipe 3. A pneumatic push frame 5 is installed on the protective pipe 4. When the gas guide pipe 3 leaks, the pressure inside the protective pipe 4 increases, and the twist handle 2 is rotated by the pneumatic push frame 5.

[0015] The process by which this device prevents natural gas leakage is as follows: Under normal circumstances, control valve 1 is in the closed state. After the natural gas is transported to the designated location and the pipeline is connected, control valve 1 is opened, allowing the natural gas in the natural gas pipe to be discharged. Then, the natural gas can be transported through the gas guide pipe 3. When the gas guide pipe 3 leaks, the natural gas can enter the inside of the protective pipe 4 and increase the gas pressure inside the protective pipe 4. Then, the pneumatic push frame 5 can be used to turn the twist handle 2 and automatically close control valve 1, thus preventing natural gas leakage.

[0016] Refer to the instruction manual appendix Figure 1 Instruction manual attached Figure 2 Instruction manual attached Figure 3 Included with instruction manual Figure 4 Multiple support blocks 6 are installed inside the protective tube 4. One end of the support block 6 is connected to the air guide tube 3. Circular baffles 7 are installed at both ends of the protective tube 4. The inner side of the circular baffles 7 is connected to the air guide tube 3. The support blocks 6 can support the protective tube 4, which facilitates the gap between the protective tube 4 and the air guide tube 3, allowing gas to flow. The circular baffles 7 can prevent gas leakage.

[0017] Refer to the instruction manual appendix Figure 1 Instruction manual attached Figure 2 Included with instruction manual Figure 3The pneumatic pusher 5 includes a circular rigid channel 8 fitted on the outer side of one end of the protective tube 4. The circular rigid channel 8 is connected to the protective tube 4 via a support rod 9. A first moving piston 10 is provided on the inner side of the circular rigid channel 8. The first moving piston 10 and one side surface of the circular rigid channel 8 are connected by multiple telescopic springs 11. The protective tube 4 and the circular rigid channel 8 are connected by a connecting pipe 12. A push rod 13 is installed on one side surface of the first moving piston 10. An inlet and outlet 14 are opened at one end of the circular rigid channel 8. One end of the push rod 13 passes through the inlet and outlet 14 and extends to the outer side of the circular rigid channel 8. A moving rack 15 is installed at one end of the push rod 13. A rotating gear 16 is installed at the rotating end of the twist handle 2. The moving rack 15 and the rotating gear 16 mesh.

[0018] The process by which the pneumatic actuator 5 closes the control valve 1 is as follows: Under normal conditions, under the elastic force of the telescopic spring 11, the first moving piston 10, the push rod 13, and the moving rack 15 can be moved to a position away from the control valve 1. When the control valve 1 is opened, the moving rack 15 does not mesh with the rotating gear 16. When gas leakage in the air guide pipe 3 causes the air pressure in the protective pipe 4 to increase, the gas can enter the annular rigid channel 8 through the connecting pipe 12, and the air pressure in the annular rigid channel 8 will increase. This will push the first moving piston 10 towards the control valve 1 and compress the telescopic spring 11. When the first moving piston 10 moves, it can push the push rod 13 and the moving rack 15, which can then rotate the rotating gear 16 through the moving rack 15. This will cause the twist handle 2 to rotate and close the control valve 1, preventing gas leakage.

[0019] Refer to the instruction manual appendix Figure 1 A detection valve 17 is installed on the tank body on one side of the control valve 1. A detection tube 18 is installed at one end of the protective pipe 4, and one end of the detection tube 18 is connected to the detection valve 17. Before unloading natural gas through the gas guide pipe 3, the detection valve 17 is opened first, so that natural gas can enter the protective pipe 4 through the detection valve 17 and the detection tube 18. If the protective pipe 4 leaks, the pneumatic pusher 5 will not respond, and it needs to be repaired. If the pneumatic pusher 5 responds, it means that the protective pipe 4 is not leaking. Then the detection valve 17 is closed, the control valve 1 is opened, and the natural gas can be unloaded. Since the gap between the protective pipe 4 and the gas guide pipe 3 is small, less gas can be used for detection, which can also improve efficiency.

[0020] Refer to the instruction manual appendix Figure 1A second movable piston 19 is installed inside the detection tube 18. An annular positioning plate 20 is installed on one side of the second movable piston 19 inside the detection tube 18. The second movable piston 19 can divide the detection tube 18 into two parts and isolate the natural gas from the outside air to prevent the natural gas from being contaminated. The annular positioning plate 20 can limit the movement of the second movable piston 19.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A LNG tank container pneumatic control device, comprising a control valve (1) installed on one end of a tank body, a twist handle (2) installed on the control valve (1), and the control valve (1) is opened or closed by rotating the twist handle (2), characterized in that, The other end of the control valve (1) is connected to an air guide pipe (3). The air guide pipe (3) is wrapped with a protective pipe (4). A pneumatic pusher (5) is installed on the protective pipe (4). When the air guide pipe (3) leaks air, the pressure inside the protective pipe (4) increases and the pneumatic pusher (5) rotates the twist handle (2).

2. The LNG tank container pneumatic control device according to claim 1, characterized in that, Multiple support blocks (6) are installed on the inner side of the protective tube (4). One end of the support block (6) is connected to the air guide tube (3). Circular baffles (7) are installed at both ends of the protective tube (4). The inner side of the circular baffles (7) is connected to the air guide tube (3).

3. A LNG tank container pneumatic control device according to claim 2, characterized in that, The pneumatic pusher (5) includes a circular rigid channel (8) fitted on the outer side of one end of the protective tube (4). The circular rigid channel (8) is connected to the protective tube (4) through a support rod (9). A first moving piston (10) is provided on the inner side of the circular rigid channel (8). The first moving piston (10) and one side surface of the circular rigid channel (8) are connected by multiple telescopic springs (11). The protective tube (4) and the circular rigid channel (8) are connected through a connecting pipe (12). A push rod (13) is installed on one side surface of the first moving piston (10). An inlet and outlet (14) are opened at one end of the circular rigid channel (8). One end of the push rod (13) passes through the inlet and outlet (14) and extends to the outer side of the circular rigid channel (8). A moving rack (15) is installed at one end of the push rod (13). A rotating gear (16) is installed at the rotating end of the twist handle (2). The moving rack (15) and the rotating gear (16) mesh.

4. The LNG tank container pneumatic control device according to claim 1, characterized in that, The control valve (1) is provided with a detection valve (17) installed on the tank body on one side, and a detection tube (18) is installed at one end of the protective tube (4), and one end of the detection tube (18) is connected to the detection valve (17).

5. A LNG tank container pneumatic control device according to claim 4, characterized in that, A second movable piston (19) is installed inside the detection tube (18), and an annular positioning plate (20) installed inside the detection tube (18) is provided on one side of the second movable piston (19).

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