Paired stator vanes

摘要

Gas turbine stationary blade unit in which two stationary blades are built in a segment by shrouds is provided with object to lessen occurrence of cracks. Two stationary blades 1a, 1b are fixed respectively by outer shroud and inner shroud, each divided into two parts 2a, 2b and 3a, 3b. Flanges 4a, 4b are provided to divided end portions of the outer shrouds 2a, 2b to be jointed together by bolts via boltholes 7. Likewise, flanges 5a, 5b are provided to divided end portions of the inner shrouds 3a, 3b to be so jointed. If the two stationary blades 1a, 1b are fixed in a segment by the shrouds which are not divided, restraining force becomes larger, local stress occurs due to thermal stress and frequency of crack occurrence increases, but as the shrouds are divided respectively into two parts and jointed together by bolts, crack occurrence is lessened. Also, pinholes are provided in face of divided portion of the shrouds and pins are inserted thereinto for connection of the divided shrouds, thereby relative movement between the divided shrouds is prevented and a strong jointed blade unit is provided.