STEAM TURBINE ROTOR AND SERVICE LIFE PROLONGING METHOD FOR STEAM TURBINE ROTOR

摘要

PROBLEM TO BE SOLVED: To provide a steam turbine rotor of outside tab tail type capable of preventing fretting damage of a wheel side hook and prolonging its service life.;SOLUTION: Blade side hooks 5a to 5c meshing with wheel side hooks 2a to 2c, respectively, are formed on inner sides in planting parts 5 of blades 3, 3'. Recessed parts 10 for avoiding contact with surfaces 50a to 50c of the blade side hooks 5a to 5c, respectively, are provided in a part (A part) corresponding to a section between each group 3A of blades in the peripheral direction of a wheel 1 out of faces 20a to 20c on inner sides in the radial direction of the wheel 1 of the wheel side hooks 2a to 2c. Each recessed part 10 has a curved face shape in which both end parts in the peripheral direction of the wheel 1 come into contact with surfaces of the blade side hooks 5a to 5c so as to form a tangential line substantially.;COPYRIGHT: (C)2006,JPO&NCIPI