Segmented turbine vane support structure

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 25/24 (2006.01) F01D 9/04 (2006.01)

Patent

CA 2449483

A segmented vane support structure for use in a gas turbine engine having a engine casing, includes a single piece inner ring and separated front outer and rear outer rings. The vane segments circumferentially abut to form a stator ring which is clamped at the respective opposed outer ends by the front outer and rear outer rings therebetween onto the inner ring. The front outer and rear outer rings are axially restrained to the engine casing by a retaining ring which is fitted in an inner annular groove of the engine casing. Each vane segment has a lug member at its outer diameter which radially and slidably engages in a slot of the engine casing to provide angular positioning of the vane segments within the engine casing and to transmit circumferential vane load into the engine casing. This support structure arrangement transmits circumferential loading to the engine casing and isolates radial loading from the engine casing caused by thermal growth changes of the vane segments.

L'invention concerne une structure support d'aubes segmentées à utiliser dans une turbine à gaz présentant un carter moteur, laquelle structure comprend une bague intérieure monobloc et des bagues extérieures avant et arrière séparées. Les segments d'aube viennent s'abouter de manière circonférentielle pour former un stator annulaire fixé sur la bague intérieure au niveau des extrémités externes opposées respectives entre les bagues extérieures avant et arrière. Les bagues extérieures avant et arrière sont immobilisées axialement sur le carter moteur par une bague de retenue ajustée dans une rainure annulaire intérieure du carter moteur. Chaque segment d'aube présente un élément saillant au niveau de son diamètre externe, s'engageant de manière radiale et coulissante dans une rainure du carter moteur pour permettre un positionnement angulaire des segments d'aube à l'intérieur du carter moteur et transmettre au carter moteur l'effort circonférentiel de l'aube. Cet ensemble structure support transmet l'effort circonférentiel au carter moteur et isole l'effort radial du carter moteur, engendré par des variations de dilatation thermique des segments d'aube.

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