Francis-type hydraulic turbine wheel equipped with a...

F - Mech Eng,Light,Heat,Weapons – 03 – B

Patent

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Details

F03B 3/02 (2006.01) F03B 11/00 (2006.01) F03B 11/04 (2006.01)

Patent

CA 2718064

This wheel comprises a plurality of vanes (2) arranged on a crown (3) and is equipped with a tip-forming member (10) attached to a central region (32) of the crown or hub of the wheel (1), radially inside the vanes (2), the crown defining a wet surface (31) for guiding a flow (E) passing between the vanes. The tip-forming member (10) is provided with at least one opening (121) for diverting a fraction (E1) of the flow towards the internal volume (V10) of this member. This member comprises a frustoconical annular skirt (11) and at least one fin (15) arranged in its internal volume (V10) and able to modify the path of the flow fraction (E1) entering this volume through the opening (121). This fin (15) extends as far as the edge (112) of the skirt (11) which defines an outlet opening (14) of the member (10) for the flow fraction (E1).

Cette roue comprend plusieurs aubes (2) disposées sur un plafond (3) et est équipée d'un organe (10) formant pointe rapporté sur une zone centrale (32) du plafond ou moyeu de la roue (1), radialement à l'intérieur des aubes (2), le plafond définissant une surface mouillée (31) de guidage d'un écoulement (E) passant entre les aubes. L'organe formant pointe (10) est pourvu d'au moins une ouverture (121) de déviation d'une partie (E1) de l'écoulement vers le volume interne (V10) de cet organe. Cet organe comprend une jupe annulaire tronconique (11) et au moins une ailette (15) disposée dans son volume interne (V10) et apte à modifier le trajet de la partie d'écoulement (E1) pénétrant dans ce volume par l'ouverture (121). Cette ailette (15) s'étend jusqu'au bord (112) de la jupe (11) qui délimite une ouverture (14) de sortie de l'organe (10) pour la partie d'écoulement (Ei).

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