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US 12,546,332 B1Granted
High-efficiency cooling fan impeller
AssigneeUndada Company Limited
InventorsEduardo Strle, Vinícius Burigo Neto
Life of this patent
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Abstract
An impeller for use in HVAC-R fans includes a plurality of blades projecting radially from a hub. The Gaussian curvature of the pressure-side surface of the blade is substantially negative. In a preferred embodiment, the Gaussian curvature of the pressure-side surface is less than or equal to zero at all points on the surface.
Claims9
An impeller comprising:
- (a) a circular hub having a central axis of rotation and a circumference, wherein the circumference defines an azimuthal direction about the axis of rotation;
- and
- (b) a plurality of impeller blades, each blade having a pressure-side surface with a surface area;
- (c) wherein the blades are azimuthally distributed about the circumference of the hub;
- (d) wherein each blade extends from the hub radially from the axis of rotation;
- (e) wherein the pressure-side surface has a first principal curvature and a second principal curvature;
- (f) wherein the first principal curvature is greater than or equal to zero over the majority of the surface area;
- (g) wherein the second curvature is less than or equal to zero over the majority of the surface area;
- (h) wherein the surface area for which the product of the first principal curvature and the second principal curvature is negative is greater than the surface area for which the product of the first principal curvature and the second principal curvature is positive;
- and
- (i) wherein the surface area for which the product of the first principal curvature and the second principal curvature is negative is greater than the surface area for which the product of the first principal curvature and the second principal curvature is zero.
8 more elements
Dependencies are inferred from the claim text.