Steam turbine speed regulating valve actuator

Abstract

The invention discloses a governing valve actuating mechanism of a steam turbine. The governing valve actuating mechanism of the steam turbine comprises a rack and a driving oil cylinder, wherein a sleeve is longitudinally installed in the rack, a lifting rod which can move along the axial direction of the sleeve is arranged in the sleeve, the bottom end of the lifting rod stretches out of the sleeve and is connected with a lifting plate which is provided with a plurality of governing valves, the top end of the lifting rod is hinged with one end of a hinging support through a first hinging shaft, the other end of the hinging support is hinged with the driven actuating end of a rocking frame through a second hinging shaft, the driving end of the rocking frame is hinged with a driving connecting rod of the driving oil cylinder through a third hinging shaft, the rocking frame between the driven end and the driving end is hinged with one end of a rocking rod, and the other end of the rocking rod is hinged with the rack; claw-shaped baffles are respectively overlapped on the first hinging shaft, the second hinging shaft and the third hinging shaft, and claw arms of the claw-shaped baffles just block the outer sides of the shaft ends of the two sides of the corresponding hinging shafts. The governing valve actuating mechanism of the steam turbine has the advantages that the use safety is high and the hinging shafts can be prevented from falling.

Description

technical field [0001] The invention relates to a steam turbine speed regulating valve actuator in a steam turbine. Background technique [0002] The steam turbine adjusts the intake air volume by adjusting the opening of the speed regulating valve, and then realizes the adjustment of the speed of the steam turbine. The opening of the speed regulating valve is controlled by the speed regulating valve actuator of the steam turbine. The structure of the speed regulating valve actuator of the steam turbine currently used is: including the frame and the driving cylinder, and there are vertically arranged in the frame The lifting rod that can move up and down in the frame, the bottom end of the lifting rod is fixed with the lifting plate installed with several speed regulating valves, the top end of the lifting rod is fixed with the slider, and the slider is connected with the hinge bracket through the first hinge shaft One end of the hinged bracket is hinged, the other end of t...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of this steam turbine speed regulating valve actuator are: (1) Since the entire steam turbine speed regulating valve actuator is installed on the upper part of the steam turbine head, the temperature is low when the steam turbine is stopped, and the temperature is high during normal operation, resulting in The limit screw used to prevent the hinged shaft from falling off in the speed-regulating valve actuator is easy to loosen due to frequent alternation of cold and heat, causing the hinged shaft to fall off from the positioning sleeve, causing the power or speed of the steam turbine to be out of control, which is buried for safe production. (2) Since the hinged shaft is used to transmit the force, after long-term use, there will be a gap between the hinged shaft and the positioning sleeve, so that the limit screw cannot be tightly pressed against the hinged shaft, resulting in the normal position of the limit screw in the steam turbine. During operation, it is easy to vibrate due to the contact gap with the hinge shaft, which will cause the screw to loosen, causing the power or speed of the steam turbine to be out of control, which has buried hidden dangers for safe production; (3) due to the friction between the limit screw and the hinge shaft , when the friction force is too large, there will be a phenomenon that the hinge shaft is stuck and the transmission is not flexible. In severe cases, the limit screw will be cut and damaged, and the function of limit and anti-falling will be lost, which has buried hidden dangers for safe production.

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