STEAM TURBINE

摘要

A steam turbine 10 according to an embodiment includes: a casing 20 having a turbine rotor 22; a diaphragm outer ring 23 arranged at an inner side of the casing 20, and having a hollow part 30 inside thereof; a diaphragm inner ring 24 arranged at an inner side of the diaphragm outer ring 23; and a stationary blade 25 joined to the diaphragm outer ring 23 by welding and supported between the diaphragm outer ring 23 and the diaphragm inner ring 24. A non-joint part 61 existing at a part of a joint part 60 between the diaphragm outer ring 23 and the stationary blade 25, and in which an end part at an outer diameter side of the stationary blade 25 is not welded to the diaphragm outer ring 23; and a suction part 40 collecting waterdroplet or a water film from the non-joint part 61 are included.

主权项

1. A steam turbine, comprising:
a casing where a turbine rotor in which rotor blades are implanted is provided to penetrate; a diaphragm outer ring arranged at an inner side of the casing, and having a hollow part inside thereof; a diaphragm inner ring arranged at an inner side of the diaphragm outer ring; a stationary blade forming a turbine stage with the rotor blade, at least whose end part at an outer diameter side is joined to the diaphragm outer ring by welding, and supported between the diaphragm outer ring and the diaphragm inner ring; a non-joint part existing at a part of a joint part between the diaphragm outer ring and the stationary blade at the turbine stage where wet steam flows, and in which the end part at the outer diameter side of the stationary blade is not welded to the diaphragm outer ring; and a suction part communicated with the hollow part, and collecting waterdroplet or a water film from the non-joint part.