Steam turbine

Abstract

A steam turbine includes: a rotor shaft that rotates about an axis; a plurality of rotating blade rows fixed to an outer side in a radial direction of a surface of the rotor shaft about the axis and arranged at intervals in an axial direction in which the axis extends; a casing that covers the rotor shaft and the plurality of rotating blade rows; stator blade rows fixed to the casing and arranged at intervals on a first side in the axial direction with respect to the rotating blade rows; and bearings that are fixed to the casing and rotatably support the rotor shaft. The casing includes a flow guide that guides steam flowing out of a rotating blade row in a last stage arranged closest to a second side in the axial direction among the plurality of rotating blade rows to an outside of the casing, a packing portion arranged at an interval on an inner side in the radial direction with respect to the flow guide, the bearings being attached to the packing portion, and a plurality of ribs connecting the flow guide and the packing portion, extending in the radial direction, and arranged at intervals in a circumferential direction about the axis.

Dependencies are inferred from the claim text.