Quickly-propelled low-power and energy-saving hydraulic servo-actuator

Abstract

The invention provides a quickly-propelled low-power and energy-saving hydraulic servo-actuator, relates to the technical field of valve control, and aims to solve the technical problem that the prior art cannot simultaneously ensure control accuracy and response speed. The actuator comprises an execution loop, a quick control loop and an oil tank, wherein the execution loop comprises a servo motor, a two-way pump, an oil cylinder, two locking valves and two oil filling valves and is used for carrying out low-speed and accurate control on a turbine valve; and the quick control loop comprises a pilot safety valve, a storage pump motor, a storage pump, an energy storage and a quick closing solenoid valve and is used for controlling quick action of the turbine valve. The actuator has the advantages of high response speed, high control accuracy and low operating cost.

Description

technical field [0001] The invention relates to the technology of valve control, in particular to the technology of a fast-propelled low-power energy-saving hydraulic servo actuator. Background technique [0002] The hydraulic servo actuator (oil motor) is the executive part of the steam turbine regulation and security system, and also the executive part of various industrial control valves. Its main function is to control the piston movement in real time through hydraulic pressure changes, and then control the opening of the (steam turbine) valve . [0003] The traditional steam turbine regulating system adopts the electro-hydraulic servo system of the valve-controlled oil motor. This system (see Figure 2) adopts the electro-hydraulic servo valve Hs supplied with oil from the outside. The oil inlet and oil return port of the electro-hydraulic servo valve Hs are respectively Connect the external oil source, and the two control oil ports are respectively connected to the two...

AI Technical Summary

Problems solved by technology

However, due to the inherent structural characteristics of the electro-hydraulic servo valve itself, this system has the following disadvantages: 1) The machining accuracy of the electro-hydraulic servo valve is high, and its price is very expensive; 2) Due to the small structure of the electro-hydraulic servo valve and the valve body It is relatively fragile, so it is particularly sensitive to oil pollution, and its valve core is easily worn by impurities in the oil to cause failure, so it must be equipped with a filter system with high filtration accuracy; 3) Since the electro-hydraulic servo valve is sensitive to temperature changes, However, the energy loss of the valve-controlled oil motor electro-hydraulic servo system is very serious, and its throttling heat is relatively large, so it must be equipped with a relatively complete cooling system; 4) Since the electro-hydraulic servo valve is supplied with oil from the outside, it needs a pumping station system to provide Constant pressure oil source, which increases the overall volume and complexity of the system; 5) When the system is in a non-working cycle (pressure-holding and idling conditions), the system is still running, which increases operating costs

Therefore, the cost of the direct-drive volume control electro-hydraulic servo system is lower than that of the valve-controlled oil motor electro-hydraulic servo system, but since the sensitivity of the combination of the AC servo motor and the oil pump is lower than that of the electro-hydraulic servo valve, the response of this system The speed is slow, so it cannot be applied to high-power steam turbines that require high fast shut-off function

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