| 摘要 |
<p>A seal structure for a steam cooling type gas turbine, adapted to seal spaces between turbine discs so as to prevent the leakage of cooling steam and the self-excited vibration of baffle plates by improving the sealability of the seal structure with respect to spaces between inner portions (2) of a rotor and gas paths, wherein the seal structure between gas turbine discs is formed by providing a groove (7) in an end surface of at least one of disc lands (6), which projects toward each other between adjacent rotor discs, in such a manner that the groove (7) extends in a circumferential direction of the end surface, and disposing an inside hollow-carrying annular seal member (10) in a pressure-contact state on an inner surface of the groove (7) and an end surface of the other disc land (6) or an inner surface of a groove (7), whereby the reliable retention of a sealed state of spaces between the gas turbine discs and the improving of the sealability of the seal structure are rendered possible by increasing a sealing surface pressure by utilizing a centrifugal force generated by the rotation of the turbine.</p> |
