Patent ID: 8257046
Filing Date: 2012-09-04
Classification: F01D,F05D

Abstract:
1. A turbine rotor blade comprising a cover provided at a blade head of an effective blade portion and a blade-fitting portion provided at a blade base of the effective blade portion, the blade-fitting portion being fitted to a turbine-wheel engagement portion provided in a turbine rotor via a solid portion, the turbine rotor blade being a portion of a blade unit structure formed by arranging the cover and a neighboring cover in contact with each other, wherein the cover has a cover ventral-bulging section that bulges in a circumferential direction of the turbine rotor from one side of the cover located on a ventral blade side, and has a cover dorsal-bulging section that bulges in the circumferential direction of the turbine rotor from another side of the cover located on a dorsal blade side, the bulging sections being positioned in a point symmetrical arrangement with each other as viewed from the blade head, wherein a sum of a width of the cover ventral-bulging section in an axial direction of the turbine rotor and a width of the cover dorsal-bulging section in the axial direction of the turbine rotor is greater than a width of the cover in the axial direction of the turbine rotor, and wherein the solid portion is provided with an anti-twist segment projecting in the axial direction of the turbine rotor and extending in the circumferential direction of the turbine rotor.