Intelligent stop valve for liquid methane tank container

Abstract

An intelligent stop valve for a liquid methane tank container belongs to the technical field of low-temperature valves. The assembly type ball valve comprises an assembly type ball valve and further comprises a pneumatic actuator, a pneumatic part of the pneumatic actuator transmits linear motion to a rotating part, the outside of the rotating part is connected with one end of a crank, the other end of the crank is connected with one end of a connecting rod, the other end of the connecting rod is connected with a rocker, and the other end of the rocker is provided with a square hole. A valve rod of the assembled ball valve is sleeved with the rocker through a square hole, the rocker rotates to drive the valve rod to rotate to drive a valve body of the assembled ball valve to be opened and closed, the assembled ball valve, the pneumatic actuator, the crank, the connecting rod and the rocker are jointly arranged in an external support, and the assembled ball valve and the pneumatic actuator are both connected to the external support. Automatic control over the valve of the liquid methane tank container can be achieved, the response speed of the valve is increased while intelligent non-manual rapid control is achieved, the control precision of the valve is proper, and valve leakage can be avoided.

Description

Technical Field

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

[0002] At present, valves suitable for liquid methane tank containers are almost all controlled by manual actuators. The reason is that if the existing electric actuators are used for direct control, the low temperature pipeline caused by liquid methane will cause the electric actuator to have a lower precision when automatically controlling the device due to cold shrinkage, which will in turn cause the precision of the controlled valve to decrease, affecting the sealing performance, and easily causing the stored liquid methane to leak, resulting in dangerous consequences. Manual actuators have a series of problems such as complex operation and slow response speed, which reduces operating efficiency. 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 stop valve for a liquid methane tank container; the present invention can realize automatic control of the valve of the liquid methane tank container, improve the response speed of the valve while realizing intelligent non-manual rapid control, and has proper control accuracy of the valve, thereby avoiding the occurrence of valve leakage.

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

[0005] The present invention provides an intelligent stop valve for a liquid methane tank container, comprising an assembled ball valve, characterized in that it also comprises a pneumatic actuator, the pneumatic part of the pneumatic actuator is transmitted to the rotating part through linear motion, the rotating part is externally connected to one end of a crank, the other end of the crank is connected to one end of a connecting rod, the other end of the connecting rod is connected to a rocker, the other end of the rocker is provided with a square hole, the rocker is sleeved on the valve stem of the assembled ball valve through the square hole, the valve stem is driven to rotate by the rotation of the rocker, and the valve body of the assembled ball valve is driven to switch, the assembled ball valve, the pneumatic actuator, the crank, the connecting rod and the rocker are jointly arranged in an external bracket, and the assembled ball valve and the pneumatic actuator are both connected to the external bracket.

[0006] Furthermore, the shell of the pneumatic actuator is connected to the external bracket, and two air holes leading to the interior of the shell are provided on the shell. The pneumatic part of the pneumatic actuator is arranged at both ends of the shell, and the pneumatic part includes a sealing ring and a rack connected to the sealing ring. One of the air holes is divided into two air passages respectively leading to between the two sealing rings and the end wall of the shell, and the other air hole leads to between the two sealing rings through the air passage. The two sealing rings move horizontally by the pressure of the gas, driving the two racks to translate. The rotating part is a gear, and the two racks are engaged with the gear at the same time to drive the gear to rotate, and the shaft of the gear is connected to the crank.

[0007] Furthermore, both ends of the shell of the pneumatic actuator are connected to spring covers with rods, and springs are sleeved on the spring covers, and the ends of the springs are connected to the sealing rings.

[0008] Furthermore, the sealing ring is connected to the rack via a protrusion, and ribs are provided at the protrusion corners of the sealing ring.

[0009] Furthermore, a cam is connected above the shaft of the gear, and a limiting screw is arranged on the inner wall of the cylinder housing. The limiting screw corresponds to the large circle part of the cam to limit the rotation of the cam.

[0010] Beneficial effects of the present invention.

[0011] The present invention can realize remote automatic opening of the ball valve by using an intelligently controlled pneumatic actuator as a driving part and a crank-connecting rod rocker as a transmission part. The pneumatic actuator is more automatic and intelligent than a manual actuator, is easy to control and has a fast response. By extending the transmission chain between the pneumatic actuator and the ball valve, the low temperature of the pipeline on the ball valve has less effect on the pneumatic actuator, thereby ensuring the opening and closing control accuracy of the valve to a great extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the pneumatic actuator of the present invention when viewed from above.

[0015] Figure 3 It is a schematic diagram of the structure of the whole of the present invention after the shell and gears of the pneumatic actuator are removed.

[0016] Figure 4 It is a side view of the assembled structure of the present invention.

[0017] Markings in the figure: 1 is an assembled ball valve, 2 is a pneumatic actuator, 3 is a crank, 4 is a connecting rod, 5 is a rocker, 6 is a square hole, 7 is an external bracket, 8 is a shell, 9 is an air hole, 10 is a sealing ring, 11 is a rack, 12 is a gear, 13 is a spring cover, 14 is a spring, 15 is a rib plate, 16 is a cam, and 17 is a limit screw. DETAILED DESCRIPTION

[0018] As shown in the accompanying drawings, this embodiment provides an intelligent stop valve for a liquid methane tank container, including an assembled ball valve 1. The assembled ball valve 1 can control the rotation of the ball by rotating the valve stem connected to the ball, thereby controlling the opening and closing of the valve. The assembled ball valve 1 is used as the main control stop valve of the liquid methane tank container.

[0019] The driving part for driving the valve stem movement adopts a pneumatic actuator 2. The shell 8 of the pneumatic actuator 2 is connected to the external bracket 7. The shell 8 is provided with two air holes 9 leading to the inside of the shell 8. The power air source is introduced into the pneumatic actuator 2 by connecting the air pipe to the air hole 9.

[0020] The pneumatic part of the pneumatic actuator 2 is arranged at both ends of the housing 8, and the pneumatic part includes a sealing ring 10 and a rack 11 connected to the sealing ring 10. The sealing ring 10 is connected to the rack 11 through a set protrusion, and the protruding corners of the sealing ring 10 are provided with ribs 15 for enhancing strength and rigidity.

[0021] One of the air holes 9 is divided into two air passages which lead to between two sealing rings 10 and the end wall of the housing 8 respectively, and the other air hole 9 leads to between the two sealing rings 10 through the air passage. The two sealing rings 10 move horizontally due to the pressure of the gas, driving the two racks 11 to translate. The rotating part is the gear 12. The two racks 11 are meshed with the gear 12 at the same time to drive the gear 12 to rotate. The pneumatic part of the pneumatic actuator 2 is transmitted to the rotating part through linear motion, realizing the conversion of translational motion into rotational motion.

[0022] Both ends of the housing 8 of the pneumatic actuator 2 are connected to spring covers 13 with rods, and springs 14 are sleeved on the spring covers 13. The ends of the springs 14 are connected to the sealing rings 10 to ensure that the gear 12 and the rack 11 operate within the safe working range, thereby ensuring the safe operation of the gear 12 and the rack 11.

[0023] The shaft of the gear 12 is externally connected to one end of a crank 3, the other end of the crank 3 is connected to one end of a connecting rod 4, the other end of the connecting rod 4 is connected to a rocker 5, the other end of the rocker 5 is provided with a square hole 6, and the rocker 5 is sleeved on the valve stem of the assembled ball valve 1 through the square hole 6. The transmission chain between the pneumatic actuator 2 and the assembled ball valve 1 is extended by the arrangement of the crank 3, the connecting rod 4, and the rocker 5, thereby reducing the influence of the low-temperature pipeline near the assembled ball valve 1 on the pneumatic actuator 2 and improving the control accuracy.

[0024] When air source is introduced into different air holes 9 of the pneumatic actuator 2, the gear 12 rotates clockwise or counterclockwise, driving the transmission chain to move in different directions, and then the valve stem rotates through the rotation of the rocker 5 in different directions to drive the valve body of the assembled ball valve 1 to open and close.

[0025] The assembled ball valve 1, the pneumatic actuator 2, the crank 3, the connecting rod 4 and the rocker 5 are arranged together in the external bracket 7. The assembled ball valve 1 and the pneumatic actuator 2 are both connected to the external bracket 7 to realize the installation of the entire stop valve.

[0026] 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. A liquid methane tank container intelligent stop valve, comprising an assembled ball valve (1), characterized in that: The invention also comprises a pneumatic actuator (2), wherein the pneumatic part of the pneumatic actuator (2) transmits linear motion to the rotating part, wherein the rotating part is externally connected to one end of a crank (3), wherein the other end of the crank (3) is connected to one end of a connecting rod (4), wherein the other end of the connecting rod (4) is connected to a rocker (5), wherein the other end of the rocker (5) is provided with a square hole (6), wherein the rocker (5) is sleeved on the valve stem of the assembled ball valve (1) through the square hole (6), wherein the rotation of the rocker (5) drives the valve stem to rotate, thereby driving the valve body of the assembled ball valve (1) to be opened and closed, wherein the assembled ball valve (1), the pneumatic actuator (2), the crank (3), the connecting rod (4) and the rocker (5) are collectively arranged in an external bracket (7), and the assembled ball valve (1) and the pneumatic actuator (2) are both connected to the external bracket (7).

2. The intelligent stop valve for liquid methane tank container according to claim 1 is characterized in that: The housing (8) of the pneumatic actuator (2) is connected to the external bracket (7). The housing (8) is provided with two air holes (9) leading to the interior of the housing (8). The pneumatic part of the pneumatic actuator (2) is arranged at two ends of the housing (8). The pneumatic part comprises a sealing ring (10) and a rack (11) connected to the sealing ring (10). One of the air holes (9) is divided into two air passages leading to the spaces between the two sealing rings (10) and the end wall of the housing (8), respectively. The other air hole (9) leads to the space between the two sealing rings (10) through the air passage. The two sealing rings (10) move horizontally by the pressure of the gas, driving the two racks (11) to move horizontally. The rotating part is a gear (12). The two racks (11) are simultaneously meshed with the gear (12) to drive the gear (12) to rotate. The shaft of the gear (12) is connected to the crank (3).

3. The intelligent stop valve for liquid methane tank container according to claim 2 is characterized in that: Both ends of the housing (8) of the pneumatic actuator (2) are connected to spring covers (13) with rods, and springs (14) are sleeved on the spring covers (13). The ends of the springs (14) are connected to the sealing rings (10).

4. The intelligent stop valve for liquid methane tank container according to claim 2 is characterized in that: The sealing ring (10) is connected to the rack (11) via a protrusion, and a rib (15) is provided at a corner of the protrusion of the sealing ring (10).

5. The intelligent stop valve for liquid methane tank container according to claim 2 is characterized in that: A cam (16) is connected above the shaft of the gear (12), and a limiting screw (17) is provided on the inner wall of the cylinder housing. The limiting screw (17) corresponds to the large circle portion of the cam (16) and limits the rotation of the cam (16).

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