Gas-liquid mixing driving valve actuating mechanism
A technology for driving valves and actuators, applied in the direction of fluid pressure actuators, etc., can solve problems such as poor working speed stability, reduced grease lubrication effect, easy to produce crawling, vibration, etc., to reduce wear, reduce wear, improve The effect of sealing and lubricating effect
Active Publication Date: 2015-04-01
CHANGZHENG ENG
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Problems solved by technology
[0004] First, due to the compressibility of air, the stability of the working speed is poor when the force is large or the force changes greatly, and it is prone to crawling, vibration and other phenomena;
[0005] Second, the sliding parts of the pneumatic actuator are rubbed in a dry air environment. If things go on like this, the lubricating effect of the grease will be reduced and the service life of the pneumatic actuator will be reduced
Although adding a lubricator can better solve this problem, it increases the cost and the complexity of controlling the gas path
Method used
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Embodiment Construction
[0028] The content of the present invention is further described below in conjunction with a specific implementation manner shown in the accompanying drawings:
[0029] like figure 1 As shown, the actuator of the present invention includes a double-piston cylinder and an air-liquid tank. Wherein, the double-piston cylinder includes two cylinder barrels 11 sequentially socketed between the lower end cover 1 and the upper end cover 23 with a central hole, and a partition plate 17 with a central hole is arranged between the two cylinder barrels 11, and Socketed with two cylinders 11, between the lower end cover 1 and the cylinder 11, between the cylinder 11 and the partition 17, between the cylinder 11 and the upper end cover 23, a total of four O-rings 22 are used to achieve static sealing In order to prevent leakage, they are then fixed together by long studs 25 and nuts 24. The two pistons 14 are respectively arranged in the two cylinders 11, which divide the interior of the...
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The invention provides a gas-liquid mixing driving valve actuating mechanism which comprises two pistons which respectively move in two cylinder barrels, two piston rods which are respectively and fixedly connected with the two pistons, and a gas-liquid tank which is used for containing gas working mediums and liquid working mediums. The gas working mediums (J1) and the liquid working mediums (J2) are contained in the same chamber of the gas-liquid tank (31) and are respectively communicated with chambers on the same sides of the pistons (14) in the two cylinder barrels (11). A first gas supply port (K1) is communicated with the gas working mediums (J1). A second gas supply port (K2) is communicated with chambers on the other sides of the two pistons (14).
Description
technical field [0001] The invention relates to a valve actuator, in particular to a gas-liquid mixed drive actuator used for orbital ball valves, regulating valves, stop valves, gate valves and other valves, and belongs to the technical field of valve drive control. Background technique [0002] Various types of industrial valves are widely used in petroleum, chemical, metallurgy, papermaking and other industrial fields for the control of liquid and gas pipelines. At present, the automatic drive control of the valve mainly has two operating modes: electric and pneumatic. Among them, the pneumatic actuator with air as the working medium is most widely used in the automatic drive control of valves due to its advantages of easy access to working medium, low cost, and no pollution. [0003] However, pneumatic actuators have the following disadvantages in actual use: [0004] First, due to the compressibility of air, the stability of the working speed is poor when the force is...
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IPC IPC(8): F15B15/02
Inventor 黎玉飞刘永良颜震王志刚
Owner CHANGZHENG ENG