Blade tip clearance control device for gas turbine engine - has biassing wave spring preloaded against shroud segment to move it towards rotor

摘要

The device includes a shroud segment (92) disposed in an opening (90) defined by a mounting section (82) of the stationary casing (74). A channel (100) is between radially spaced portions of the shroud segment and the stationary casing mounting section. A biasing wave spring (102) is disposed in the channel (100) and preloaded against the shroud segment to move radially inwardly toward the rotor. - Flanges on opposite sides of the shroud segment and on the stationary casing mounting section at opposite sides of the opening (90) cooperate to define inner and outer limits or radial movement of the shroud segment as the shroud segment is moved toward and away from the rotor. A mechanism (106) is rotatably mounted to the stationary casing mounting section, threadedly coupled (108A, 96) to the shroud segment and linked by lever-arms (112) to a unison ring.