Intelligent emergency cut-off valve for liquid methane tank container

Abstract

The invention discloses an intelligent emergency cut-off valve for a liquid methane tank container and belongs to the technical field of low-temperature valves. The device comprises a pneumatic actuator and a stop valve which serve as control components, the end of a piston column of the pneumatic actuator is connected with a guide rail sliding block, a guide rail track frame is arranged in cooperation with the guide rail sliding block, the top of the guide rail sliding block is rotationally connected with one end of an upper connecting rod, and the other end of the upper connecting rod is connected with the top end of a rotatable outer cylindrical cam of a cylindrical cam mechanism. An inner limiting rack of the cylindrical cam mechanism is fixed to an outer rack, an outer cylindrical cam can rotate outside the inner limiting rack, the upper end of a valve rod of the stop valve is hinged to one end of a lower connecting rod, a roller is arranged at the other end of the lower connecting rod, and the roller is located in a cam groove in the outer wall of the outer cylindrical cam and can move along an inner rail of the cam groove. Remote transmission between the control element and the stop valve can be achieved, the control element is effectively protected, and the control precision of the control element on the stop valve is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cryogenic valves, and in particular relates to an intelligent emergency shut-off valve for a liquid methane tank container. Background Art

[0002] At present, the multimodal transport of methane tank containers is highly favored by the industry. Relevant enterprises in various links of the domestic methane industry chain have begun to lay out related businesses. As one of the safety accessories of methane intermodal tank containers, the emergency shut-off valve realizes remote monitoring, on-site manual operation and automatic shut-off functions in emergency situations (fire, abnormal temperature, etc.) through pneumatic control. It is a key supporting equipment to ensure the safe and stable operation of the tank container. However, there are many challenges in the transportation and storage of liquids containing methane, such as liquefied natural gas, such as low temperature, high pressure and corrosive environment, which puts extremely high requirements on related equipment. For traditional shut-off valves, the low temperature of the wall may cause damage to the control components, affecting the control accuracy of the control components on the shut-off valve. Summary of the invention

[0003] The present invention aims at the above-mentioned problems, makes up for the deficiencies of the prior art, and provides an intelligent emergency shut-off valve for a liquid methane tank container; the present invention can realize long-distance transmission between control components and the shut-off valve, effectively protect the control components, improve the control accuracy of the shut-off valve by the control components, and can also mitigate impact, absorb vibration, reduce vibration and noise during power transmission, and improve the stability and reliability of the system operation.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] The present invention provides an intelligent emergency shut-off valve for a liquid methane tank container, comprising a pneumatic actuator and a shut-off valve as control components, characterized in that the end of the piston column of the pneumatic actuator is connected to a guide rail slider, a guide rail track frame is provided in conjunction with the guide rail slider, the guide rail track frame is arranged on an external frame, the top of the guide rail slider is rotatably connected to one end of an upper connecting rod, the other end of the upper connecting rod is connected to the top end of a rotatable outer cylindrical cam of a cylindrical cam mechanism, the inner limit frame of the cylindrical cam mechanism is fixed to the external frame, the outer cylindrical cam can rotate outside the inner limit frame, the upper end of the valve stem of the shut-off valve is hinged to one end of a lower connecting rod, the other end of the lower connecting rod is provided with a roller, the roller is located in a cam groove on the outer wall of the outer cylindrical cam and can move along the inner track of the cam groove, so that the lower connecting rod drives the valve stem to move up and down to control the valve switch of its shut-off valve.

[0006] Furthermore, a protrusion is provided on the upper portion of the outer cylindrical cam, the end of the upper connecting rod is rotatably connected to the protrusion by a bolt, and a limit block corresponding to the protrusion is provided on the upper portion of the inner limit mechanism, and the protrusion can be restricted from rotating by the limit block when rotating.

[0007] Furthermore, a plane capable of cooperating with the roller is provided in the cam groove.

[0008] Furthermore, the pneumatic actuator adopts a piston cylinder.

[0009] Beneficial effects of the present invention.

[0010] The present invention can extend the transmission chain between the control element and the cut-off valve, which can not only realize long-distance transmission and effectively protect the control element from being less affected by the low-temperature liquid at the cut-off valve in terms of control accuracy, but also can mitigate impact, absorb vibration, reduce vibration and noise during power transmission, and improve the stability and reliability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0013] Markings in the figure: 1 is a pneumatic actuator, 2 is a stop valve, 3 is a piston rod, 4 is a guide slider, 5 is a guide track frame, 6 is an external frame, 7 is an upper connecting rod, 8 is a cylindrical cam mechanism, 9 is an outer cylindrical cam, 10 is an inner limit frame, 11 is a valve stem, 12 is a lower connecting rod, 13 is a cam groove, 14 is a protrusion, 15 is a limit block, and 16 is a plane. DETAILED DESCRIPTION

[0014] As shown in the accompanying drawings, this embodiment provides an intelligent emergency shut-off valve for a liquid methane tank container, including a pneumatic actuator 1 and a shut-off valve 2 as control components. The pneumatic actuator 1 is a piston cylinder driven by a commonly used shut-off valve. The piston cylinder has an air inlet and an air outlet at both ends, and a piston with a piston column 3 is built in.

[0015] The end of the piston column 3 of the pneumatic actuator 1 is connected to the guide rail slider 4 by bolts, and a guide rail frame 5 is provided in conjunction with the guide rail slider 4. The guide rail frame 5 is arranged on an external frame 6, and the guide rail slider 4 can reciprocate in the guide rail frame 5 through the reciprocating motion of the piston column 3.

[0016] The top of the guide rail slider 4 is rotatably connected to one end of the upper connecting rod 7, and the other end of the upper connecting rod 7 is connected to the top of the rotatable outer cylindrical cam 9 of the cylindrical cam mechanism 8. The inner limit frame 10 of the cylindrical cam mechanism 8 is fixed on the external frame 6. The cylindrical cam mechanism 8 is a well-known structure in the mechanical field, and its well-known structure will not be repeated here.

[0017] The upper connecting rod 7 drives the outer cylindrical cam 9 to rotate outside the inner limit frame 10 through the linear motion of the guide rail slider 4.

[0018] The upper end of the valve stem 11 of the stop valve 2 is hinged to one end of a lower connecting rod 12, and the other end of the lower connecting rod 12 is provided with a roller. Different from the conventional cylindrical cam mechanism 8, a plane 16 capable of cooperating with the roller is provided in the cam groove 13 to prevent the roller from slipping sideways. The roller is located in the cam groove 13 on the outer wall of the outer cylindrical cam 9 and can move along the internal track of the cam groove 13, so that the lower connecting rod 12 drives the valve stem 11 to move up and down to control the valve switch of its shut-off valve.

[0019] In addition, different from the conventional cylindrical cam mechanism 8, a protrusion 14 is provided on the upper part of the outer cylindrical cam 9, and the end of the upper connecting rod 7 is rotatably connected to the protrusion 14 by bolts, and a limit block 15 corresponding to the protrusion 14 is provided on the upper part of the inner limit mechanism. The protrusion 14 can be restricted from rotating by the limit block 15 when rotating, so that the lower connecting rod 12 drives the valve stem 11 to rise and fall within a safe range.

[0020] The working principle is as follows: the cryogenic emergency stop valve 2 of the methane intermodal tank is connected to the pipeline system by welding technology. The stop valve 2 uses compressed air as a power source, and drives the movement of the valve stem 11 and the valve core through the pneumatic actuator 1, thereby realizing the opening and closing of the fluid channel.

[0021] The design of the stop valve 2 takes into account the special properties of methane, such as low temperature, high pressure, and flammability and explosion, to ensure safety and reliability during transportation and storage.

[0022] When compressed air enters the pneumatic actuator 1, it pushes the piston and piston rod 3 to move, which in turn drives the valve stem 11 to rise and fall, so that the valve can quickly and accurately open or close the fluid channel. When the stop valve 2 is in the closed state, the valve stem 11 and valve core of the stop valve 2 tightly seal the fluid channel to prevent methane leakage. When the valve needs to be opened, compressed air enters the pneumatic actuator 1, pushing the piston and piston rod to move, which in turn drives the valve stem 11 to rise and fall, so that the fluid channel opens. When the methane flow rate needs to be adjusted, the valve opening can be adjusted by controlling the intake volume or intake time of compressed air, thereby achieving precise control of the flow rate.

[0023] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. An intelligent emergency shut-off valve for a liquid methane tank container, comprising a pneumatic actuator (1) and a shut-off valve (2) as control components, characterized in that: The end of the piston column (3) of the pneumatic actuator (1) is connected to the guide rail slider (4), and a guide rail frame (5) is provided in cooperation with the guide rail slider (4). The guide rail frame (5) is arranged on an external frame (6). The top of the guide rail slider (4) is rotatably connected to one end of an upper connecting rod (7), and the other end of the upper connecting rod (7) is connected to the top of a rotatable outer cylindrical cam (9) of a cylindrical cam mechanism (8). The inner limit frame (10) of the cylindrical cam mechanism (8) is fixed to the external frame. (6), the outer cylindrical cam (9) is capable of rotating outside the inner limit frame (10), the upper end of the valve stem (11) of the shut-off valve (2) is hinged with one end of a lower connecting rod (12), the other end of the lower connecting rod (12) is provided with a roller, the roller is located in a cam groove (13) on the outer wall of the outer cylindrical cam (9) and is capable of moving along the inner track of the cam groove (13), so that the lower connecting rod (12) drives the valve stem (11) to move up and down to control the valve switch of the shut-off valve.

2. The intelligent emergency shut-off valve for liquid methane tank container according to claim 1 is characterized in that: A protrusion (14) is provided on the upper portion of the outer cylindrical cam (9); an end portion of the upper connecting rod (7) is rotatably connected to the protrusion (14) via a bolt; a limit block (15) corresponding to the protrusion (14) is provided on the upper portion of the inner limit mechanism; and the protrusion (14) can be restricted in rotation by the limit block (15) when rotating.

3. The intelligent emergency shut-off valve for liquid methane tank container according to claim 1 is characterized in that: A plane (16) capable of cooperating with the roller is provided in the cam groove (13).

4. The intelligent emergency shut-off valve for liquid methane tank container according to claim 1 is characterized in that: The pneumatic actuator (1) adopts a piston cylinder.

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