Turbine mit einer Zusatzdichtung für die Dichtung von Statorelemente

摘要

In a gas turbine having a chordal hinge seal between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface (54) of a nozzle support ring (44), a supplemental seal (70) is disposed between the support ring and inner rail of the nozzle segment on a high pressure side of the chordal hinge seal. The supplemental seal includes a pair of sheet metal shims (72, 74) overlaid by a woven metallic cloth (76) supported by a bracket (80) secured to a back side surface of the inner rail. The radially inner end of the cloth seal bears against the annular sealing surface of the nozzle support ring. The shims of the legs of the supplemental seal are slit (104, 108) along their distal margin (100) and staggered in a chord-wise direction relative to one another to provide flexibility and effective sealing engagement with the nozzle support ring.