초록 ▼

A gear-actuated mechanical clearance control apparatus is operable for controlling the clearance between rotor blade tips and the casing shroud of a gas turbine engine. The apparatus includes a pair of annular rings which extend about the casing shroud, a shroud hanger disposed between the casing an

A gear-actuated mechanical clearance control apparatus is operable for controlling the clearance between rotor blade tips and the casing shroud of a gas turbine engine. The apparatus includes a pair of annular rings which extend about the casing shroud, a shroud hanger disposed between the casing and an opening in the casing and between the annular rings, and a shroud segment defining a circumferential portion of the casing shroud and disposed in the casing opening. The apparatus also has an actuating mechanism which includes driven gear sectors on the annular rings which face toward one another and a gear disposed between the annular rings and having a peripheral driving gear sector which intermeshes with the driven gear sectors of the annular rings. Upon rotation of the gear, the annular rings undergo opposite circumferential movement causing radial movement of the shroud hanger and the shroud segment therewith to establish the clearance between the shroud segment and rotor blade outer tips.

대표청구항 ▼

In a gas turbine engine including a rotatable rotor having a central axis and a row of blades with outer tips and a stationary casing with a shroud and being disposed in concentric relation with said rotor, an apparatus for controlling the clearance between said rotor blade tips and casing shroud, s

In a gas turbine engine including a rotatable rotor having a central axis and a row of blades with outer tips and a stationary casing with a shroud and being disposed in concentric relation with said rotor, an apparatus for controlling the clearance between said rotor blade tips and casing shroud, said apparatus comprising: (a) a structure on said stationary casing spaced radially outwardly from an opening defined in said stationary casing and defining a plurality of mounting elements extending in a substantially radial direction relative to said central rotor axis; (b) a pair of arcuate members extending circumferentially about said casing shroud and movable relative thereto, said arcuate members being spaced from opposite sides of said mounting elements of said stationary casing structure, said arcuate members having supporting elements which extend in inclined directions relative to a circumferential line about said casing shroud; (c) means disposed between said stationary casing structure and said opening in said stationary casing and between said arcuate members, said means including a shroud segment and being mounted to said supporting elements of said arcuate members for movement relative to said arcuate members and radially toward and away from said stationary casing opening, said shroud segment defining a circumferential portion of said casing shroud, being separate from said stationary casing and disposed in said stationary casing opening; and (d) actuating means disposed between said arcuate members and between a said shroud hanger and said stationary casing structure, said actuating means being mounted to said stationary casing structure and operable for moving said arcuate members circumferentially to cause radial movement of said shroud hanger and therewith radial movement of said shroud segment to establish a desired clearance between said shroud segment and rotor blade outer tips.