EXHAUST CHAMBER INLET-SIDE MEMBER, EXHAUST CHAMBER, GAS TURBINE, AND LAST-STAGE TURBINE BLADE REMOVAL METHOD

摘要

An object of the present invention is to easily remove last-stage turbine blades. Provided is an exhaust chamber inlet-side member that has an annular shape around a rotor so as to form a part of an inner diffuser at a position facing, from the axially downstream side, base ends of last-stage turbine blades disposed on the most downstream side in the axial direction, and that is divided in the circumferential direction and provided so as to be detachable from the inner diffuser. When the exhaust chamber inlet-side member is dismounted from the inner diffuser, a space on the axially downstream side from the last-stage turbine blades is cleared.

主权项

1. An exhaust chamber inlet-side member that is provided on an inlet side of an exhaust chamber including:
a casing wall that is disposed, relative to a turbine including a plurality of turbine blades that are provided around a rotating shaft and in multiple stages in an axial direction in which the rotating shaft extends and rotate with the rotating shaft, on the downstream side adjacent to the turbine and has a cylindrical shape centered at an axis of the rotating shaft; an outer diffuser provided along an inner peripheral surface of the casing wall and having an annular shape around the rotating shaft; an annular inner diffuser which is disposed on the radially inner side of the outer diffuser and between which and the outer diffuser a combustion gas passage is formed; and a plurality of struts that are disposed in a circumferential direction between the outer diffuser and the inner diffuser, and connect the casing wall and an annular bearing cover covering a bearing of the rotating shaft to each other, the exhaust chamber being divided in the circumferential direction into an upper-half part and a lower-half part, wherein the exhaust chamber inlet-side member has an annular shape around the rotating shaft so as to form a part of the inner diffuser at a position facing, from the axially downstream side, base ends of last-stage turbine blades that are disposed on the most downstream side in the axial direction, and the exhaust chamber inlet-side member is divided in the circumferential direction and provided so as to be detachable from the inner diffuser.