| 摘要 |
PURPOSE: To provide a supporting structure with which a turbine blade can make thermal expansion in both axial and radial directions, the blade is prevented from touching on a rotor despite thermal deformation, and a space between the blade and a rotor/casing can be sealed lest a gas flow should flow into a part other than a blade arrangement. CONSTITUTION: A supporting structure consists of a shroud ring 18a, which surrounds a bucket 2 adjacent to a stationary blade 1, a casing 14 provided with a ring holding part 14a for holding the shroud ring 18a in a radial direction and in a freely movable manner, an inner ring 15 and an outer ring 16, which are installed in the inner and outer end parts of the stationary blade 1 so as to form a gas flow passage in between, and a sealing member 17b, which is installed inside the inner ring 15 via a deformed supporting member 17a in order to seal the space adjacent to a rotating rotor 3. The casing 14 is provided with a hollow, cylindrical cavity 14b one end of which is opened to the inside of the casing 14. One end part 16a of the outer ring 16 is fixed to the casing 14, while the other end part 16b is inserted in an axial direction, touching its inner side to the inner surface of the hollow cavity 14b. |
