HYDRAULIC SERVO ACTUATOR FOR TURBINE CONTROL STEAM VALVE OF NUCLEAR AND THERMAL POWER PLANTS USING HYDRODYNAMIC BEARING

摘要

The present invention relates to a hydraulic servo actuator for the turbine controlling steam valve of nuclear and thermal power plants using a hydrodynamic bearing and, specifically, to a hydraulic servo actuator for the turbine controlling steam valve of nuclear and thermal power plants using a hydrodynamic bearing to minimize friction between a piston and a cylinder using a unidirectionally tapered hydrodynamic bearing on a piston rod which vertically moves inside the cylinder tube of an actuator; to prevent malfunction caused by foreign substances by filtering the foreign substances inside hydraulic oil which minutely flows through the outer circumference of the hydrodynamic bearing using buffering on the outer circumference of one hydrodynamic bearing part of which diameter decreases; and to prevent the movement of the piston caused by pressure changes and to guide the movement of the piston using wearing on the outer circumference of the other hydrodynamic bearing part of which diameter increases. [Reference numerals] (AA) Microflow;(BB) Sectional diagram showing a structure diagram of an actuator with hydraulic pressure dynamic bearing, wearing, and buffering