STEAM TURBINE

摘要

A steam turbine 10 according to an embodiment includes rotor blades 22 implanted to a turbine rotor 21, stationary blades 26 making up a turbine stage together with the rotor blades 22, diaphragm outer rings 23 including an annular extending part 24 surrounding a periphery of the rotor blades 22, and supporting the stationary blades 26, and diaphragm inner rings 25 supporting the stationary blades 26. The steam turbine 10 further includes an annular slit 40 formed at an inner surface of the diaphragm outer ring 23 between the stationary blades 26 and the rotor blades 22 along a circumferential direction, and communication holes 50 provided in plural at an outer surface of the diaphragm outer ring 23 along the circumferential direction, communicated to the annular slit 40 from the outer surface side, and communicated to an exhaust chamber sucking water films via the annular slit 40.

主权项

1. A steam turbine where wet steam flows in a turbine stage in low-pressure, comprising:
rotor blades implanted in a circumferential direction to a turbine rotor provided to penetrate in a casing; stationary blades provided at an immediate upstream side of the rotor blades in the circumferential direction, and making up a turbine stage together with the rotor blades; diaphragm outer rings provided inside the casing, each including an annular extending part surrounding a periphery of the rotor blades, and supporting the stationary blades from outside in a radial direction; diaphragm inner rings supporting the stationary blades from inside in the radial direction; an annular slit formed at an inner surface of the diaphragm outer ring between the stationary blades and the rotor blades along the circumferential direction; and communication holes provided in plural at an outer surface of the diaphragm outer ring along the circumferential direction, communicated to the annular slit from the outer surface side of the diaphragm outer ring, and communicated to a suction part sucking liquid via the annular slit.