PURPOSE: To prevent a recessed part provided for fitting a ceramic blade root part with a shank part from being deformed to be opened by centrifugal force caused by operation, and to control the gap clearance on the tip end of the ceramic blade.
CONSTITUTION: In a moving blade structure wherein ceramics having high thermal resistance is used for a part of a moving blade, a recessing part provided for fitting a ceramic blade root part with a shank part is restricted from being deformed to be opened by centrifugal force during operation, and wedge- shaped parts 6 are arranged between mutually adjacent shank parts 5. Moreover, the parts 6 are displaced in the direction of radius of gyration of a rotor caused by centrifugal force during operation, thereby force is applied to the recessed part of the shank part 5 in the direction for closing the recessed part. Moreover, high-temperature lubricant having heat resistance is applied to the contact surface between the shank part 5 and the wedge-shaped parts 6. And both sides of the shank are restrained by shank shells (side plates 7, 8).
MACHIDA TAKASHI
TERAMAE TETSUO
HAMADA HARUICHI
TOKYO ELECTRIC POWER CO