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Self-capacitance electrohydraulic executor

An electro-hydraulic actuator and self-contained technology, which is applied in the direction of machines/engines, fluid pressure actuators, engine components, etc., can solve the problems of heavy operation and maintenance workload, expensive construction costs, and high costs, and achieve simplified oil sources block, eliminate wasted oil sources, and reduce costs

Active Publication Date: 2009-06-03
HANGZHOU HOLLYSYS AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The huge oil source station and external oil pipelines make the construction cost expensive, the operation and maintenance workload is heavy, and the cost is high

Method used

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  • Self-capacitance electrohydraulic executor
  • Self-capacitance electrohydraulic executor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] refer to figure 1As shown, it is the first embodiment of the present invention, that is, the schematic diagram of the oil circuit of the self-contained electro-hydraulic actuator used for regulating valve control. The self-contained electro-hydraulic actuator includes: a hydraulic cylinder 1, an operating seat 2, a stroke transmitter 3, an oil source block 5, a check valve 48, an accumulator 49 and a control oil circuit block 6. The oil source block 5 of the present embodiment is made up of parts such as oil tank 41, high-pressure gear oil pump 42, the electric motor 43 of driving oil pump, high limit oil pressure switch 50, low limit oil pressure switch 51 and oil filling solenoid valve 52. And the control oil circuit block 6 is then made up of parts such as electro-hydraulic servo valve 53, fast closing solenoid valve 54, unloading valve 47, oil supply check valve 56 and oil discharge check valve 55. In this embodiment, the important feature is that the electro-hydra...

Embodiment 2

[0062] refer to figure 2 Shown is the second embodiment of the present invention, that is, the schematic diagram of the oil circuit of the self-contained electro-hydraulic actuator used for the control of the main steam valve. The difference between this embodiment and the first embodiment is that the activity test solenoid valve 53' in this embodiment is equivalent to the electro-hydraulic servo valve 53 in the first embodiment, and the oil outlet of the oil supply check valve 56 is connected with the activity. The oil inlet port P of the test solenoid valve 53' is connected. The oil discharge port T port of the movable test solenoid valve 53' is communicated with the inside of the oil tank 41 through an oil discharge check valve 55 for oil discharge, and its A port is communicated with the hydraulic cylinder 1 control port. At the same time, the travel transmitter 3 in the first embodiment is replaced with the travel switch group 3 in this embodiment. The action process w...

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Abstract

This invention provides a self-contained electro-hydraulic performer for steam turbine controlling system. It includes oil sources block, accumulator, controlling oil sources block, fluid cylinder and administer. The oil sources block, controlling oil sources block, fluid cylinder and administer integrate together for a self-contained electro-hydraulic performer. In this performer, the oil passage is contained in oil sources block and controlling oil sources block without external oil passage. Because of integrated structure of this invention, it can be installed in the control valve while using it. Connect with the power cord and the signal cord, the assignment can be completed. The main characteristic of the invention is integrated structure. Energy-saving, environmentally friendly, system simplified, structure simplified, Convenient, Lower costs and higher reliability appear because of this integrated structure. It can be used for taking place of large steam turbine large high-pressure steam-fuel electro-hydraulic servo system and used for large low-pressure steam turbine oil-turbine electro-hydraulic servo system.

Description

technical field [0001] The invention relates to an electro-hydraulic actuator in the field of automatic control, in particular to a self-contained electro-hydraulic actuator used in a steam turbine control system. Background technique [0002] The existing steam turbine electro-hydraulic control system consists of an electronic controller, an electro-hydraulic actuator and an oil source station. The required pressure oil is provided by the centralized oil source station through an external oil pipeline. Usually an oil source station supplies oil to multiple electro-hydraulic actuators through external oil pipelines, which is a distributed structure. Since a steam turbine requires multiple electro-hydraulic actuators, the required energy is supplied centrally by the pressure oil provided by the oil source station, so they need to be connected to each other through a complex pipeline system. [0003] Huge external oil pipelines are prone to leaks, causing system failures, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/08F01D17/26
Inventor 罗作桢
Owner HANGZHOU HOLLYSYS AUTOMATION