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US 8,770,939 B2Granted
Turbine rotor blade assembly and steam turbine
AssigneeKabushiki Kaisha Toshiba
InventorsTomohiko Tsukuda, Sakae Kawasaki, Hiroshi Kawakami
Life of this patent
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Abstract
In a turbine rotor blade assembly 1, a length h2 in the radial direction of a bucket dovetail 15 of a notch blade 10 is configured to be shorter than a length h3 in the radial direction of an effective blade portion 13 of a adjacent notch blade 30 and a length h4 in the radial direction of the bucket dovetail 15. Thus, during an insertion of the notch blade 10 in the axial direction, the rotational movement Rf around the radial direction and the circumferential movement of the notch blade 10 can be secured.
Claims8
A turbine rotor blade assembly, comprising:
- a turbine rotor;
- and
- a plurality of turbine rotor blades implanted on the turbine rotor in a circumferential direction, the turbine rotor blades including a notch blade to be implanted last among the turbine rotor blades on the turbine rotor and an adjacent notch blade to be implanted adjacent to the notch blade, each of the turbine rotor blades comprising:
- an effective blade portion;
- a tangential type bucket dovetail disposed at a root portion of the effective blade portion;
- and
- a cover portion integrally formed on a tip of the effective blade portion, the cover portion mutually contacting an adjacent cover portion, the cover portion comprising a pressure-side overhanging portion protruded in the circumferential direction at a trailing edge side of the turbine rotor blade and a suction-side overhanging portion protruded in the circumferential direction at a leading edge side of the turbine rotor blade,
- wherein a length in a radial direction of a bucket dovetail of the notch blade is shorter than a length in the radial direction of the effective blade portion of the adjacent notch blade, and the length in the radial direction of the bucket dovetail of the notch blade is shorter than a length in the radial direction of the bucket dovetail of the adjacent notch blade, and
- wherein the length in the radial direction of the effective blade portion of the adjacent notch blade is shorter than the length in the radial direction of the bucket dovetail of the adjacent notch blade.
6 more elements
Dependencies are inferred from the claim text.