Centrifugal fan
AssigneeNicotra S.p.A.
InventorsUmberto Canali, Dario Brivio
Life of this patent
Estimating the term…
Abstract
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.
Claims8
A centrifugal fan with single or double intake having a fan impeller of the closed type formed of a rotating bladed wheel provided with at least a covering element, characterised in that the blades of the fan impeller are flat and are backwardly inclined with respect to the direction of rotation of the fan impeller and in that the covering element comprises along the direction of flow a frustoconical surface portion, a first curved surface portion and a second curved surface portion, wherein the radius of curvature of the first curved surface portion is smaller than the radius of curvature of the second curved surface portion.
A centrifugal fan according to the above claims characterised in that the dimensions of the centrifugal fan vary with an homothetic relationship according the size of the fan.
Dependencies are inferred from the claim text.