| 摘要 |
A main steam introducing part structure of a steam turbine comprises an outer casing, an inner casing disposed in the outer casing, a 180 DEG nozzle box disposed in the inner casing, and a steam introducing pipe passing through the outer and inner casings and introducing main steam from the outer casing into the nozzle box. The steam introducing pipe has, at the middle, a flange airtightly secured to the inner casing with bolts, and one end of the pipe is inserted into a hole of the outer casing through a seal ring and the other end into the steam inlet portion of the nozzle box through a seal ring. This construction is mechanically stable and easy to convert a steam turbine with 90 DEG nozzle box into a steam turbine with 180 DEG nozzle box without newly producing the inner casing.
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