Francis wheel and hydraulic machine comprising one such wheel

Details Francis wheel and hydraulic machine comprising one such wheel Francis wheel and hydraulic machine comprising one such wheel

F - Mech Eng,Light,Heat,Weapons

03

B

F03B 3/02 (2006.01) F03B 3/12 (2006.01)

Patent

CA 2498321

The invention relates to a Francis wheel comprising a ceiling, a belt and blades (2) which extend between the ceiling and the belt. The value of the angle (.beta.¿24?) between the linear speed (U, D¿224?) of a blade (2) and the median (25, ?¿224?) of said blade (2) at the trailing edge thereof, close to the point (224) at which the blade (2) is attached to the belt, is between 20 and 25·. In this way, the machine performs satisfactorily while the equivalent power thereof under a heavy load can be increased.

Cette roue de type Francis comprend un plafond, une ceinture et des aubes (2) s~étendant entre ce plafond et cette ceinture. L~angle (.beta.24) entre la vitesse linéaire (U, D224) d~une aube (2) et la médiane (25, .DELTA.224) de cette aube (2) au niveau de son bord de fuite (22) a, au voisinage du point d~attache (224) de l~aube (2) sur la ceinture, une valeur comprise entre 20 et 25~. Ceci permet d~obtenir un rendement satisfaisant de la machine, alors que sa puissance équivalente sous forte charge peut être élevée.

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