| 摘要 |
PROBLEM TO BE SOLVED: To provide a casing structure for a steam turbine, preventing the leakage of steam from a gap by suppressing the thermal deformation of an external casing for avoiding the formation of the gap in a mating surface between upper and lower flanges with the thermal deformation. SOLUTION: The casing structure for the steam turbine comprises the external casing formed by bolt-joining upper and lower side casings together at the mating surface between their flange portions and an internal structure installed inside the external casing, wherein the steam is supplied from a steam inlet portion of the external casing through the internal structure to stationary and moving blade stages. A cooling mechanism is mounted on the outer wall of the steam inlet portion of the external casing for cooling the steam inlet portion or its vicinity. COPYRIGHT: (C)2004,JPO
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