Steam turbine moving vane shroud structure

A moving blade and maneuvering technology, applied in the direction of machine/engine, blade supporting element, mechanical equipment, etc., can solve the problems of poor fit of the radial mating surface of the shroud, inconsistent torsion, and difficulty in blade processing and assembly.
CN100370113CActive Publication Date: 2008-02-20DONGFANG TURBINE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGFANG TURBINE CO LTD
Publication Date
2008-02-20

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Abstract

The invention relates to a shroud band structure of movable blade of turbine. Wherein, the whole level of movable blade is mounted on the wheel groove of rotor whose shroud bands are matched along circumference; the radial surface of nearby shroud bands have assemble space. The invention is characterized in that: the radial match surface of shroud band is arranged with one axial groove whose section is in V shape; the groove is mounted with damper; when the blade rotates in high speed and deforms, the radial surface is contacted to the damper all the time, to generate mechanical damp on the nearby two blades, to confirm the structural rigidity of blade, and reduce the movable stress, to improve the safety. The top of shroud band is step structure, mounted with axial steam left groove, in which the leaked airflow will form vortex, to increase the resistance on the leaked airflow.
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Description

technical field

[0001] The present invention relates to steam turbine moving blades, especially its shroud structure. Background technique

[0002] The technical development of steam turbines for power generation is carried out with the goal of increasing the capacity of a single unit and improving the steam pressure, thermal efficiency and reliability of the unit. The increase of unit capacity and the increase of steam pressure will inevitably greatly increase the load and pressure of blades at all levels. For example, the load of a 600MW steam turbine's high and medium pressure blade stage is 2.5 times that of a 300MW steam turbine, and the pressure it bears is about 1.5 times. The exciting force and the bending stress borne in the working state are significantly increased, which brings safety problems. To solve this technical problem, the moving blades of large steam turbines are designed with shrouds, and the structure of the shrouds is mostly in the form of an integral ...

Claims

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