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REXA actuator principle
The steam turbine DEH system is an important component of the automatic control system in power plants and has been widely used. The electro-hydraulic conversion device is a key component of the system, and the commonly used electro-hydraulic conversion device is prone to oil pollution and has relatively high requirements for oil quality, which has become a weak link in the reliability of DEH system operation. Therefore, in order to improve the anti pollution ability of the electro-hydraulic conversion device and system, a self contained actuator (REXA actuator) is used as the conversion device to form a steam turbine actuator DEH system. The system has been successfully applied to the design of new units and the reconstruction of old units, and has been widely used in various types of steam turbine generator units and industrial steam turbines. The system has passed the technical appraisal organized by the original State Power Corporation of China and obtained a patent certificate.
REXA actuator structure
The REXA actuator is a conversion device that converts electrical signals into high torque and displacement outputs. It is a key equipment in the DEH system without hydraulic control fluid. It adopts the intelligent mechanical, electrical, and hydraulic integrated actuator produced by the American version of REXA company [referred to as the REXA actuator]. It consists of two parts: a controller and a power module. The power module consists of an intelligent controllable motor and an independent, closed, valveless hydraulic control system. Adopting highly integrated, modular, and miniaturized design, all components are integrated internally and have an integrated structure. The intelligent controllable motor receives functional instructions from the control module, controls the power module, drives the controlled object with linear displacement and large torque, and completes the adjustment process through its own position feedback to achieve various control functions.
Characteristics of REXA actuator
1) Response time: 0.04s/mm;
2) Input signal: 4mA-20mA analog signal;
3) Output force: approximately 1000kgf, can be selected according to demand;
4) Independent closed hydraulic system without external oil supply;
5) Intelligent control is achieved by a microprocessor, which can flexibly, conveniently, and accurately adjust working parameters;
6) Various safety mechanisms in case of power loss [fully open, fully closed, and locked]
