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US 4,474,534 AGranted
Axial flow fan
AssigneeGeneral Dynamics Corporation
InventorHerbert W. Thode
Life of this patent
Estimating the term…
Abstract
An axial flow fan has a plurality of impeller blades spaced around a hub assembly. The leading edge of each blade overlaps completely the trailing edge of the preceding blade, and the angular spacing between the radial center lines of the blades is unequal, preferably varying in a sinusoidal pattern, so that tonal noise of the fan is effectively attenuated.
Claims8
An axial flow fan comprising:
- a hub assembly rotatable about an axis;
- a plurality of impeller blades mounted on said hub assembly and spaced circumferentially about said axis, wherein said blades are completely overlapped, viewed in the axial direction, with adjacent blades of said fan, and wherein said blades are sinusoidally spaced about said axis.
Dependencies are inferred from the claim text.