Centrifugal fan

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 29/28 (2006.01) F04D 29/42 (2006.01)

Patent

CA 2415264

The centrifugal fan with single or double intake is provided with a fan impeller of the closed type which is formed of a rotating bladed wheel (10) having at least a covering element (13). The blades (11) of the fan impeller (16) are flat and are backwardly inclined with respect to the direction of rotation of the fan impeller and the covering element (13) comprises along the direction of flow a frustoconical surface portion (13A), a first curved surface portion (13B) and a second curved surface portion (13C), wherein the radius of curvature of the first curved surface portion is smaller than the radius of curvature of the second curved surface portion.

L'invention concerne un ventilateur centrifuge pourvu d'une entrée simple ou double et d'une roue de ventilateur de type fermé constituée d'une roue à ailettes rotative (10) comportant au moins un élément de couvercle (13). Les ailettes (11) de la roue de ventilateur (16) sont plates et inclinées vers l'arrière par rapport au sens de rotation de la roue de ventilateur. L'élément de couvercle (13) comprend, dans le sens de l'écoulement, une partie de surface tronquée (13A), une première partie de surface courbée (13B) et une seconde partie de surface courbée (13C), le rayon de courbure de la première partie de surface courbée étant plus petit que celui de la seconde partie de surface courbée.

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