Patent ID: 6095751
Filing Date: 2000-08-01
Classification: F01D,F16J

Abstract:
A seal device in a gas turbine which has a disc, front and rear stages, a steam introduction passage and a steam recovery passage in the disc for introducing and recovering cooling steam, moving blades of the front and rear stages having cooling steam passages, the cooling steam passages each having an introduction side and a recovery side, independent cavities connecting the introduction side of the cooling steam passages with the steam introduction passage and connecting the recovery side of the cooling steam passages with the steam recovery passage, whereby steam can flow from the steam introduction passage to the steam recovery passage while cooling the moving blades, and a disc low pressure side, said seal device comprising:a bolthole passing through the disc in an axial direction of the disc and from the front stages of the gas turbine toward the rear stages of the gas turbine, said bolthole being parallel with the steam recovery passage and the steam introduction passage;a fastening bolt disposed in said bolthole;an enlarged diameter portion in said bolt hole on the disc low pressure side; anda flexible seal piece disposed in said enlarged diameter portion of said bolthole so as to closely contact an outer periphery of said fastening bolt at one end of said seal piece and an inner wall of said enlarged diameter portion at an other end of said seal piece.