| 摘要 |
A steam turbine has a stationary section, a turbine rotor, nozzle diaphragms, and a nozzle box. The stationary section includes a casing. The turbine rotor includes moving blade stages arranged in an axial direction. Each of the moving blade stages is provided with moving blades arranged in a circumferential direction, and rotatably provided in the casing. Each of the nozzle diaphragms has turbine nozzles arranged in the circumferential direction provided substantially coaxially with the turbine rotor by being secured to the stationary section. The nozzle box is supported on the stationary section and arranged at an upstream part of the moving blade stages substantially coaxially with the turbine rotor so as to lead steam flowing toward the turbine moving blades. The nozzle box holds at least two stages of the nozzle diaphragms.
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