Hydraulic control system for straight-stroke gas-liquid linkage actuating mechanism

Abstract

The invention relates to the field of hydraulic control, in particular to a hydraulic control system for a straight-stroke gas-liquid linkage actuating mechanism. The hydraulic control system involvesan oil tank, a ball valve, an oil pump, a filter, a first stop valve, a one-way valve and a second stop valve, wherein the ball valve, the oil pump, the filter, the first stop valve, the one-way valve and the second stop valve are sequentially arranged on an oil outlet pipeline of the oil tank, and the second stop valve and a first safety valve communicate with the oil tank; and two energy accumulators connected in parallel are arranged between the one-way valve and the second stop valve, and a safety valve pressure switch and a pressure gauge are arranged on a branch pipeline between the one-way valve and the first stop valve. According to the system, only one time of pressure accumulation is needed, repeated pressure accumulation is not needed in the subsequent valve opening and closingprocess, and the number of high-pressure parts of the whole system is few, so that the safety is high, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the field of hydraulic control, and in particular relates to a hydraulic control system of a straight stroke gas-hydraulic linkage actuator. Background technique [0002] The driving type of the straight-stroke actuator of the quick isolation valve is mainly divided into two types: the medium self-driving type and the gas-hydraulic driving type. The power source of medium self-driven comes from the system rather than from the outside. However, the fast isolation valve of the million-kilowatt pressurized water reactor nuclear power plant is mainly a large-diameter gate valve structure, and the actuator needs to meet the reliable action of the main steam isolation valve with long stroke, fast closing (≤5s), slow opening and slow closing under different working conditions At present, the gas-hydraulic drive type has become the mainstream type of fast isolation valve actuator. The control principle of several gas-hydraulic linkag...

AI Technical Summary

Problems solved by technology

The control principle of several gas-hydraulic linkage devices for quick isolation valves currently popular on the market is to directly store energy by compressing high-pressure gas directly in the oil cylinder, that is, the energy storage is not carried out independently. This principle often makes the hydraulic pressure of the entire actuator The system is all in a high-pressure state, which is easy to cause leakage and has a low safety factor

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