| 摘要 |
PROBLEM TO BE SOLVED: To certainly prevent the fall-off of a blade root of a final embedded blade from a blade root insertion opening, in a tangential entry type rotor.SOLUTION: Component grooves 21 and 41 extending in radial directions of the grooves toward mutually opposite directions are formed at an opening wall surface 17 of a blade root insertion opening 16 and a blade root wall surface 37 which is opposite from the opening wall surface of a blade root 32a of a final embedded blade 30a, respectively. The component grooves 21 and 41 together form a component hole which is formed in a cylindrical shape extending in radial directions Dr and where a plurality of female groove teeth 22 and 42 are formed to array in an inner circumferential surface of the hole in the radial direction. A blade attachment 50 for preventing the blade root 32a of the final embedded blade 30a from falling off from the blade root insertion opening 16 is formed in a cylindrical shape centering on a component axis Ap so as to be mountable to the component hole where a plurality of male teeth 52 which conform to the female groove teeth and are arrayed on an outer circumferential surface of the attachment in the component axis direction parallel to the component axis, and is divided into two divided pieces 51 and 51 only at a dividing surface 54 parallel to the component axis. |
