Centrifugal fan with variably cambered blades
AssigneeAirflow Research and Manufacturing Corporation
InventorMartin G. Yapp
Life of this patent
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Abstract
Boundary layer separation in a rearwardly skewed centrifugal impeller can be better controlled by designing the impeller blades with an "S" camber, i.e., with rearward curved radially extending blades in a centrifugal blower. The blades have a positive camber at a radially inward region and a negative camber at a radially outward region of the blade.
Claims8
A centrifugal blower comprising an impeller mounted to rotate on an axis, said impeller comprising a plurality of rearwardly curved, radially extending blades, said blades being characterized in that:
- (a) the blades have a positive camber at a radially inwardly region of the blade, said positive camber being 2-5% of the blade chord;
- (b) the blades have a negative camber at a radically outward region of the blade;
- whereby boundary layer separation is controlled to improve blower efficiency.
The centrifugal blower comprising an impeller mounted to rotate on an axis, said impeller comprising a plurality of rearwardly curved, radially extending blades, said blades being characterized in that:
- (a) the blades have a positive camber at a radially inwardly region of the blade;
- (b) the blades have a negative camber at a radially outward region of the blade, said negative camber being no more than about 0.25-3% of the blade chord;
- whereby boundary layer separation is controlled to improve blower efficiency.
Dependencies are inferred from the claim text.