Control of leak zone under blade platform

Details Control of leak zone under blade platform Control of leak zone under blade platform

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 11/00 (2006.01) F01D 5/22 (2006.01)

Patent

CA 2487471

A system for controlling the leak zone under the platforms (34) of blades (33) belonging to the impeller (30) of a turbomachine is disclosed, using liners (10) having edges (13, 14, 15, 18) which are flared radially inwards. Said liners are disposed in the inter-blade cavities (37) which are defined by the platforms, the radial walls upstream and downstream of the blades and the periphery of the disk (31) of the impeller. According to the invention, one of the flared edges, upstream or downstream, comprises an elastic zone (18) which rests against a surface (39) of the adjacent radial wall (35), which is inclined in relation to a radial plane, such that, under the action of centrifugal forces, the liner (10) moves axially towards the opposite radial wall (36) in order to improve the sealing in said zone. Moreover, when the impeller stops, the aforementioned elastic zone (18) moves radially inwards and the liner (10) pivots around an axis (44) at a distance from said elastic zone (18).

Il est présenté une manière pour la maîtrise de la zone de fuite sous les plates-formes (34) d'aubes (33) d'une roue aubagée (30) d'une turbomachine au moyen de chemises (10) à bords évasés (13, 14, 15, 18) radialement vers l'intérieur, disposées dans les cavités (37) interaubes délimitées par les plates-formes,les parois radiales amont et aval des aubes et la périphérie du disque (31) de la roue. L'un des bords évases, amont ou aval, présente une zone élastique (18) en appui sur une surface inclinée (39) de la paroi radiale adjacente (35) par rapport à un plan radial, de telle manière que sous l'action des forces centrifuges, la chemise (10) tend à se déplacer axialement vers la paroi radiale opposée (36) afin d'améliorer l'étanchéite dans cette zone, et qu'à l'arrêt de la roue, la zone élastique (18) se déplace radialement vers l'intérieur, la chemise (10) pivotant autour d'un axe (44) distant de la zone élastique (18).

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