| 摘要 |
PURPOSE:To ease detection of a stress corrosion crack of a key groove by providing a detection hole in an angle part between a wheel radial key groove, formed on the side of a turbine wheel, and a key fitted to said groove. CONSTITUTION:A wheel radial key groove 10 is formed on the side of a hub part 9 of a wheel fitted to the shaft of a turbine rotor, and a key 13 is fitted and connected to said key groove. A hole 14 for detecting a stress corrosion crack of the key groove 10 is provided in an angle part between the wheel radial key groove 10 and the key 13. Thus, the stress corrosion crack 10 can be easily detected without disassembling the turbine rotor. |
