Fir type blade root moving blade locking device and assembly process thereof

Abstract

The invention discloses a fir type blade root moving blade locking device. The fir type blade root moving blade locking device comprises a moving blade root and an impeller having a wheel groove, wherein the moving blade root is put into the wheel groove; and the moving blade root and the impeller are locked through a stop device. The invention discloses an assembly process of the fir type blade root moving blade locking device; and the assembly process comprises the following steps: the moving blade root is put into the wheel groove of the impeller; then, stop pieces at two sides are both put in; and after the stop pieces rotate by a certain angle corresponding to the moving blade root, one flange angle of the stop piece at each side is turned up to lock the moving blade root, so that the moving blade root cannot be rotationally loosened in operation. The fir type blade root moving blade locking device is simple in structure, accurate and reliable in positioning and convenient to machine and assemble, does not weaken the strength, does not damage the moving blade root, has no need to machine locking ports for placing the positioning pieces on the impeller or a rotor body, is simple in blade disassembly and replacement, can randomly replace any one moving blade, and is safe and reliable in use.

Description

technical field [0001] The invention relates to a steam turbine rotor moving blade, in particular to a fir tree-shaped blade root moving blade locking device and an assembly process thereof, belonging to the technical field of steam turbine design and manufacture. Background technique [0002] Because of its special geometric shape, the fir tree-shaped blade root is evenly stressed and close to an equal-strength structure. It can make reasonable use of the materials of the blade root and the rim, with high bearing capacity and good strength adaptability. The best capacity is usually used for the final stage and the second final stage of the high-speed industrial steam turbine rotor and the high-power steam turbine rotor with high strength requirements. [0003] The fir-tree type blade root is divided into axial assembly type and circumferential assembly type. Since the axial assembly type is relatively simple and convenient, it is usually used for axial assembly. In order...

AI Technical Summary

Problems solved by technology

In order to avoid the axial movement of the blades when the unit is running, it is necessary to set up a locking structure. The current axial positioning structure is relatively complicated, difficult to process and assemble, and weakens the strength of the blade root and rim. It is very troublesome to replace the blades.

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