Steam Turbine Triplet Adjusting Stage Moving Blades and Installation Method

Abstract

The invention provides a turbine trilling regulating stage moving blade. The turbine trilling regulating stage moving blade includes a three-way blade root, a middle body, a trilling blade and an integrated shroud which are connected in sequence, the end portion of a first contract surface in the circumferential direction of the integrated shroud is provided with a first mounting groove, and the end portion of a second contact surface is provided with a second mounting groove; and damping blocks are arranged in the first mounting groove and the second mounting groove, and a plurality of trilling regulating stage moving blades are evenly distributed in the circumferential direction to form an annular structure. The invention further provides an installation method of the turbine trilling regulating stage moving blade. Mounting grooves are formed and the damping blocks are assembled in the integrated shroud, and loop formation of the trilling regulating stage moving blade can be realizedunder the action of the rotating centrifugal force of the damping blocks. The loop formation performance of regulating stage blades can be improved through a turbine trilling regulating stage entire-loop moving blade adopting a structural style, the rigidness and the damping of the loop formation can be increased, and the anti-vibration ability of the regulating stage blades can be improved, thereby ensuring safely running of a unit.

Description

technical field [0001] The invention relates to a steam turbine blade, in particular to a steam turbine triplet regulating stage moving blade and an installation method. Background technique [0002] A steam turbine is a rotating machine powered by steam and converts the thermal energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants. The load of the grid is constantly changing. In order to meet the changing demands of the grid load, it is necessary to adjust the power of each steam turbine in the grid at any time to adapt to the external load. The nozzle steam distribution regulating stage has the design characteristics of large enthalpy drop and low reaction degree, so it is applied in the high-pressure cylinder of the high-power impulse steam turbine. Turbine flow, to achieve the purpose of regulation. [0003] The first-stage moving blade after nozzle steam distribution is called the regulating stage blade. The worki...

AI Technical Summary

Problems solved by technology

By processing the shroud body and the shroud block separately and then welding them into a combined shroud, the adjustable moving blade can solve the problem that the steam channel, the intermediate body and the shroud can not be processed in place, but it does not improve the vibration resistance of the blade. strength

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