| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steam turbine having a fork-type joint structure that secures sufficient strength for endurance of stress corrosion cracking, low-cycle fatigue and high-cycle fatigue, and extends an operating life while making it possible to endure long-term operation. <P>SOLUTION: The steam turbine includes a turbine rotor 2 having a plurality of rotor forks 4a-4h rowed in an axial direction; turbine blades 1 having blade forks 3a-3g that are rowed in the axial direction of the turbine rotor 2 and are engaged with the rotor forks 4a-4h; and a plurality of fork pins 5a inserted into a plurality of pin holes 6a, 7a whose positions are different from each other in the radial direction of the turbine rotor 2 in the axial direction of the turbine rotor 2, for joining the turbine rotor and the turbine blades together. In the steam turbine, a clearance between the inner diameter of the pin hole 6a of the blade forks 3a-3g and the diameter of the fork pin 5a varies depending on the axial position of the turbine rotor. <P>COPYRIGHT: (C)2013,JPO&INPIT |
