Patent ID: 8277173
Filing Date: 2012-10-02
Classification: F01D,F05D

Abstract:
1. A turbine rotor penetratingly provided in a steam turbine to which high-temperature steam is introduced, the turbine rotor comprising: a high-temperature turbine rotor constituent part where the high-temperature steam passes; low-temperature turbine rotor constituent parts sandwiching and weld-connected to said high-temperature turbine rotor constituent part and made of a material different from a material of said high-temperature turbine rotor constituent part; and a cooling part cooling said high-temperature turbine rotor constituent part by ejecting cooling steam to a position, the position being located on said high-temperature turbine rotor constituent part with a predetermined distance from a welded portion between said high-temperature turbine rotor constituent part and each of said low-temperature turbine rotor constituent parts, the predetermined distance being satisfied that the predetermined distance divided by a turbine rotor diameter of the high-temperature turbine rotor constituent part is equal to or more than 0.3, wherein said cooling part ejects the cooling steam toward a side surface or a root portion of as rotor wheel part in said high-temperature turbine rotor constituent part.