Attachment of a ceramic shroud in a metal housing

Details Attachment of a ceramic shroud in a metal housing Attachment of a ceramic shroud in a metal housing

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 11/02 (2006.01) F01D 11/08 (2006.01) F01D 25/24 (2006.01)

Patent

CA 2483391

A shroud assembly for a turbine portion of a gas turbine engine, the shroud assembly comprising an annular ceramic shroud ring, a plurality of arcuate shroud support segments, and a plurality of inwardly biased resilient members. The annular ceramic shroud ring is circumferentially disposed about radially extending blades of a turbine rotor and partially defines an annular hot gas passage of the turbine portion. The plurality of arcuate shroud support segments are radially disposed outwardly of the ceramic shroud ring and are contiguous therewith. The plurality of inwardly biased resilient members are each engaged between one of the shroud support segments and an outer annular turbine support case composed of a material having a different thermal expansion coefficient than the ceramic shroud ring. The resilient members maintain contact between the shroud support segments and the ceramic shroud ring. The shroud supporting segments and the resilient members are adapted to deflect to compensate for relative thermal growth differences between the ceramic shroud ring and the turbine support case.

L'invention concerne un ensemble chemise de protection destiné à une partie turbine d'une turbine à gaz, qui comprend un anneau de protection en céramique; plusieurs segments de support de la chemise de protection arqués; et plusieurs éléments élastiques sollicités vers l'intérieur. L'anneau de protection en céramique est disposé de manière circulaire autour de lames radiales d'un rotor de turbine, et délimite partiellement un passage des gaz chauds annulaire de la partie turbine. Les segments de support de la chemise de protection arqués sont disposés radialement vers l'extérieur de l'anneau de protection en céramique auquel ils sont contigus. Les éléments élastiques sollicités vers l'intérieur sont chacun en contact de prise entre un des segments de support de la chemise de protection et un boîtier annulaire extérieur de support de la turbine constitué d'un matériau présentant un coefficient d'allogement thermique différent de celui de l'anneau de protection en céramique. Les éléments élastiques maintiennent un contact entre les segments de support de la chemise de protection et l'anneau de protection en céramique. Les segments de support de la chemise de protection et les éléments élastiques sont adaptés pour défléchir afin de compenser les différences de dilatation thermique relative entre l'anneau de protection en céramique et le boîtier de support de la turbine.

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