| 摘要 |
PURPOSE:To prevent a shroud connecting a group of buckets with each other from being locally deformed by forming a group of buckets provided witha stop blade by a lightweight material such as a titanium alloy in a turbine in which the group of buckets provided with turbine buckets and the group of buckets provided with the stop blade are provided while standing on the outer peripheral part of a rotor disc. CONSTITUTION:A turbine bucket 30 installed opposing to a nozzle diaphragm 31 is constructed by providing a large number of turbine blades 38 and at least one sheet of a stop blade 39 on the outer peripheral part of a rotor disc 40 while allowing them to stand. The turbine blade 38 is mounted via a notch formed on one part of the blade mounting part 42 of the rotor disc 40, and the stop blade 39 is lastly mounted on the notch and fixed thereon by driving a stop pin 44 and a stop key 45 therein. Respective blades 38, 39 are connected several sheets each at a time by means of a shroud 47 to form the groups of buckets 48, 49. Now, for the groups of buckets 48 each having the stop blade 39, the respective blades 38, 39 are formed of a lightweight alloy steel such as a titanium alloy, etc. Hereby, the local deformation of the shroud 47 is prevented. |
