Intrinsic safety type fire-proof and explosion-proof electro-hydraulic actuator and control method thereof

Abstract

The invention relates to an intrinsic safety type fire-proof and explosion-proof electro-hydraulic actuator and a control method thereof. The intrinsic safety type fire-proof and explosion-proof electro-hydraulic actuator and the control method thereof are used for controlling an intercepting valve to be opened or closed. The intrinsic safety type fire-proof and explosion-proof electro-hydraulic actuator comprises an actuator body, an actuating mechanism and a hydraulic control unit. The actuating mechanism and the hydraulic control unit are arranged on the actuator body; the actuating mechanism comprises a hydraulic cylinder used for being connected with the intercepting valve, and the hydraulic control unit is communicated with the hydraulic cylinder; the hydraulic control unit comprises a pump control branch and a hydraulic control branch, and the pump control branch and the hydraulic control branch are connected in parallel and communicated with the hydraulic cylinder; the pump control branch comprises a hydraulic pump and an electronic control system, the hydraulic control branch comprises an energy accumulator, a first temperature control valve, a second temperature control valve and an oil tank, and the energy accumulator, the first temperature control valve, the hydraulic cylinder, the second temperature control valve and the oil tank are sequentially communicated in series. The control method is used for controlling the electro-hydraulic actuator to work to guarantee safety. The intrinsic safety type fire-proof and explosion-proof electro-hydraulic actuator has the advantages of being high in safety, simple in structure and convenient to maintain.

Description

technical field [0001] The invention relates to an actuator for controlling the operation of industrial valves, in particular to an intrinsically safe fire-proof and explosion-proof electro-hydraulic actuator and a control method thereof, which are widely used in petrochemical, electric power, metallurgy, mining and other industries. Background technique [0002] The electro-hydraulic actuators in the prior art usually rely on the hydraulic pump to drive the hydraulic cylinder to control the opening or closing of the valve to realize the control of the oil or gas circuit. When danger occurs, the electric control device sends a signal to the hydraulic pump to close the valve. Signal, so as to close the oil circuit or gas circuit to ensure safety, but in some special working conditions, such as flammable, explosive, fire occasions, the electrical signal may cause the second occurrence of the accident, thereby further triggering the explosion Therefore, in an emergency state, t...

AI Technical Summary

Problems solved by technology

Some accidents, such as when the fire just broke out, have not yet cut off the power, which may further expand the accident.

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