| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam turbine capable of improving corrosion resistance of a free-cutting material layer and suppressing leakage of steam at a seal part.SOLUTION: A steam turbine is provided with: an inner casing; a turbine rotor 23 provided in the inner casing, and in which a moving blade 22 is implanted; and a diaphragm outer ring 26 provided inside the inner casing, supporting a stationary blade 28 from an outer peripheral side, and surrounding an outer periphery of the moving blade 22 at immediately downstream of the stationary blade 28. The steam turbine is provided with: a seal member 80 projecting from an outer peripheral surface of a shroud 31 at a tip of the moving blade 22; a free-cutting material layer 100 provided on an inner peripheral surface of the diaphragm outer ring 26; a seal member 110 projecting from an end surface 31b on an upstream side of the shroud 31 toward an upstream side of a turbine rotor axis direction; and a free-cutting material layer 130 provided in the diaphragm outer ring 26 facing the seal member 110.SELECTED DRAWING: Figure 2 |
