Execution mechanism for safety shut-off valve

Abstract

The invention relates to an execution mechanism for a safety shut-off valve. The execution mechanism comprises a push rod which penetrates through a power unit, an output unit and a buffer unit; the power unit comprises an air cavity formed by an upper cylinder cover and a lower cylinder cover, the push rod is sleeved with a piston in sealing connection with the inner wall of the air cavity, and an air inlet penetrates through the outer wall of the lower cylinder cover and is formed in the upper end face; the output unit comprises a lower cylinder cover and a spring cavity formed by the springbase; in the spring cavity, a tray sleeves the push rod, and elastic parts are arranged between the lower cylinder cover and the tray in a circumferential mode; and the buffer unit comprises a hydraulic buffer cavity formed by an upper end cover, a lower end cover, an outer cylinder and an inner cylinder; The power unit, the output unit and the buffer unit are designed in a split mode, the push rod is lifted through the piston in the air cavity, the push rod is quickly and downwards moved through the elastic parts in the spring cavity, the buffering of the piston push rod is achieved througha one-way throttle valve and an energy storage device in the hydraulic buffer cavity, the buffering of the push rod quickly and downwards is achieved, and the execution mechanism can quickly and stably close a gate.

Description

technical field [0001] The invention relates to an actuator, in particular to an actuator for a safety cut-off valve. Background technique [0002] The actuators for cut-off valves often realize the gate switch through the operation of the push rod. When an emergency occurs, the push rod needs to move quickly in a short time to realize the closing of the gate. However, during the rapid movement of the push rod, it is bound to contact The bottom of the actuator cylinder hits and damages the cylinder, which in turn damages the gate. [0003] To sum up, how to realize the rapid shut-off of the actuator and the smooth operation of the closing gate has become an urgent problem to be solved by the researchers of our company. Contents of the invention [0004] The technical problem to be solved by the invention is: how to close the gate quickly and smoothly by the actuator. [0005] In order to solve the above technical problems, the present invention adopts the following techn...

AI Technical Summary

Problems solved by technology

[0002] The actuators for cut-off valves often realize the gate switch through the operation of the push rod. When an emergency occurs, the push rod needs to move quickly in a short time to realize the closing of the gate. However, during the rapid movement of the push rod, it is bound to contact Impact on the bottom of the actuator cylinder, damaging the cylinder and consequently the gate

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