Electro-hydraulic actuator anti-rotation mechanism for steam turbine electro-hydralic adjusting system

Abstract

The invention provides an electro-hydraulic actuator anti-rotation mechanism for a steam turbine electro-hydralic adjusting system. The mechanism is characterized in that an anti-rotation mechanism body is arranged on each of the front side and the rear side of an actuator, according to each anti-rotation mechanism body, the inner end of an anti-rotation support is fixed on a base, the outer end of the anti-rotation support is provided with an ear plate, a hole on the ear plate of the anti-rotation support is a screw hole, the inner end of a disc spring support is fixed on the electro-hydraulic actuator, the outer end of the disc spring support is provided with an ear plate, the ear plate of the disc spring support and the ear plate of the anti-rotation support are arranged in an inside-outside mode in the X-direction, the inner section of a guide rod is an polished rod, the outer section of the guide rod is a screw rod, the screw rod is matched with the screw hole on the ear plate ofthe anti-rotation support, a disc spring is arranged on the polished rod section of the guide rod and is positioned between the two ear plates, an adjusting nut matched with the screw rod is arrangedbetween the disc spring and the ear plate of the anti-rotation support, and the adjusting nut and the ear plate of the disc spring support are used as a disc spring seat. The mechanism has the positive effects that the relative rotation of a piston rod and a joint body is avoided, and the service life of the electro-hydraulic actuator type steam turbine valve adjusting system is prolonged.

Description

technical field [0001] The invention relates to an electro-hydraulic regulating system for a steam turbine, in particular to a tripod-type steam distribution mechanism. Background technique [0002] CN 105041390 A discloses an integrated electro-hydraulic actuator steam turbine valve adjustment system, the electro-hydraulic actuator 6 is used as a lever drive device, and the electro-hydraulic actuator 6 is fixed in the groove of the groove-shaped bracket 1, and the lower end of the bracket is Installed on the base 10 through the hinge shaft 9 , the upper end of the piston rod 61 of the electro-hydraulic actuator is hinged 22 with the power point of the tripod lever 2 . The running direction of the piston rod of the electro-hydraulic actuator is defined as the Z direction, the axial direction of the above-mentioned hinge shaft is defined as the Y direction, and the direction perpendicular to the Y direction is defined as the X direction, and the X and Y directions are on the ...

AI Technical Summary

Problems solved by technology

If the torque is too large, it will make the piston rod of the electro-hydraulic actuator and the joint body rotate relative to each other, and the consequence is that it will affect the normal operation of the electro-hydraulic actuator (the preset value of the fully open position and the fully closed position deviate from the actual value). ); if it is serious, the piston rod of the electro-hydraulic actuator will be completely disengaged from the joint body, causing the electro-hydraulic actuator to fall completely, damaging the electro-hydraulic actuator, and causing a shutdown accident of the steam turbine

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