SEAL STRUCTURE FOR GAS TURBINE COOLING PASSAGE JOINT PART

摘要

PROBLEM TO BE SOLVED: To positively maintain sealing of a path from a gas turbine disc to a moving blade so as to improve sealing performance by disposing an O-ring on the rotational center side of a sealing point of a joint part, and disposing a bush in contact with the rotational center side of the O-ring. ;SOLUTION: A joint part 7 communicating a cooling medium passage 3 of a turbine blade 1 with a cooling medium passage 4 of a turbine disc 2 has a disc side sealing point 13 formed at a lower part communicated with the turbine disc 2 so that the spherical surface of a small radius of curvature at the center part comes in contact with the turbine disc 2. An O-ring 10 is arranged on the rotational center side of the disc side sealing point 13, and an O-ring bush 11 is further arranged in contact with the O-ring 10. Even with the progress of wear of the disc side sealing point 13 due to vibration under continuous operation for a specified period, sealing function can be maintained by the O-ring 10 arranged on the rotational center side so as to be able to prevent grave degradation of entire sealing performance.;COPYRIGHT: (C)1999,JPO