Multi-cylinder electro-hydraulic control system for double-valve-core rotary type direction throttle valve control cylindrical valve

Abstract

The invention discloses a multi-cylinder electro-hydraulic control system for a double-valve-core rotary type direction throttle valve control cylindrical valve. The multi-cylinder electro-hydraulic control system comprises a plurality of hydraulic cylinders which are connected with the cylindrical valve. An upper cavity of each hydraulic cylinder is connected with a double-valve-core rotary type direction throttle valve, and a lower cavity of each hydraulic cylinder is connected with the double-valve-core rotary type direction throttle valve through a hydraulic control one-way valve. A control port of each hydraulic control one-way valve is connected with an oil inlet pipe of the upper cavity of one hydraulic cylinder, a port P2 of each hydraulic control one-way valve is connected with the lower cavity of one hydraulic cylinder, and a port P1 of each hydraulic control one-way valve is connected with one double-valve-core rotary type direction throttle valve. All the double-valve-core rotary type direction throttle valves are connected with one working condition switching hydraulic reversing valve. The multi-cylinder electro-hydraulic control system for the double-valve-core rotary type direction throttle valve control cylindrical valve is complete in function, safe, reliable, few in hydraulic element, simplified in system and convenient to debug and detect.

Description

technical field [0001] The invention relates to the field of electromechanical-hydraulic integrated control, in particular to a double-spool rotary directional throttle valve-controlled cylinder valve multi-cylinder electro-hydraulic control system. Background technique [0002] As a disconnect valve, the barrel valve is installed between the fixed guide vane and the movable guide vane of the turbine. Due to the large diameter and mass of the cylinder valve, its opening and closing process needs to be completed by multiple actuators. Because it needs to move in a horizontal and stable state, and the phenomenon of card issuance cannot occur, a reliable synchronization system is required to ensure the synchronous operation of multiple actuators. At present, the synchronization methods used in cylinder valves are mainly mechanical synchronization and electro-hydraulic synchronization. The existing electro-hydraulic synchronous control is mainly realized by a closed-loop contr...

AI Technical Summary

Problems solved by technology

The existing electro-hydraulic synchronous control is mainly realized by a closed-loop control system composed of electro-hydraulic servo (proportional) valves, servomotors and displacement sensors. High cost, difficult to achieve high precision control

The system and pipeline connections are complex and difficult to debug

[0003] Chinese patent "200910070109.1" discloses an electro-hydraulic control system for turbine barrel valves with a flyaway shut-off function, which controls the speed of the servomotor by controlling the flow rate of the electro-hydraulic proportional directional valve to achieve high-precision hydraulic-electrical synchronization and speed control, and has Overspeed protection device and flyaway shutdown function, but the control pipeline of this system is relatively complicated, and the control of position and speed through hydraulic components is not as convenient and accurate as directly using digital valves

[0004] Chinese patent "200910059617.X" discloses an all-digital integrated cylindrical valve electro-hydraulic synchronous control system. By controlling the frequency and quantity of digital cylinder input pulses, high-precision electrical synchronous control and speed control requirements are realized, and the control is simplified. system and hydraulic lines, but the system does not have overspeed protection and flyaway shutdown

The main hydraulic control element adopts a slide valve digital valve, and a mechanical conversion mechanism is required between the stepping motor and the valve core to convert the rotation angle into the linear displacement of the valve core. With the wear of the conversion mechanism, the uncertainty of control increases, and due to The digital valve and the hydraulic cylinder are integrated, so it is not suitable to use this control method to transform the existing cylinder valve control system

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