| 摘要 |
PURPOSE:To reduce a degree of thermal stress, by installing a first flow passage along an outer surface on an inner casing and also a second flow passage along an inner surface on an outer casing both of a steam turbine consisting of double casings. CONSTITUTION:A first flow passage 18 is formed on an outer surface of an inner casing 5 by a cover 17, while a second flow passage is formed on an inner surface of an outer casing 6 by a cover 27. In time of transient operation in a turbine, steam is made to flow in the first flow passage along but in time of steady operation, the steam is made to flow in the second flow passage alone, thus thermal stress in both casings is reduced. |
