Device to control the play in a gas turbine

Details Device to control the play in a gas turbine Device to control the play in a gas turbine

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 11/24 (2006.01)

Patent

CA 2475081

Device for controlling clearance between the tips (4a) of rotary blades (4) and a stationary ring assembly in a gas turbine (2), said device comprising a circular control box (22) surrounding said stationary ring assembly, said control box (22) comprising: at least two annular air circulation strips (24a,24b, 24c) spaced apart from each other in the axial direction and each having a plurality of perforations (26) for modifying the temperature of the stationary ring assembly by discharging air; an annular air feed channel (28), and a plurality of hollow distribution spacers (32) connects said air feed channel to said air circulation strips in order to feed the strips with air while allowing the air that has been discharged against the stationary ring assembly to flow between said feed channel (28) and said circulation strips in order to be exhausted therefrom.

Dispositif de contrôle de jeu entre le sommet (4a) d'aubes rotatives (4) et un ensemble à anneau fixe d'une turbine à gaz, le dispositif comprenant un boîtier circulaire de pilotage (22) comportant au moins deux rampes annulaires de circulation d'air (24a, 24b, 24c) espacées l'une de l'autre dans le sens axial et comportant chacune une pluralité de perforations (26) pour modifier la température de l'ensemble à anneau fixe par décharge d'air, un canal annulaire d'alimentation en air (28) espacé radialement des rampes de circulation d'air, au moins une conduite d'air pour alimenter en air le canal d'alimentation (28), et une pluralité d'entretoises creuses de distribution (32) reliant le canal d'alimentation en air aux rampes de circulation d'air afin d'alimenter en air ces dernières tout en permettant à l'air ayant été déchargé sur l'ensemble à anneau fixe de circuler entre le canal d'alimentation et les rampes de circulation pour y être évacué.

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