Patent ID: 9051837
Filing Date: 2015-06-09
Classification: F01D,F04D,F05D

Abstract:
1. An impeller, comprising: a hub having an upper surface and a lower surface; a plurality of upper blades disposed around the hub and connected to the upper surface; and a plurality of lower blades disposed around the hub and connected to the lower surface, wherein the upper and lower blades are alternately disposed and outwardly extend from the hub, wherein the height of the upper and lower blades, along the extended direction, are gradually increased, wherein a cross sectional curvature of each of the upper and lower blades is not zero, and wherein the hub has an axis, and an angle, from a top view, formed from the axis to the distal ends of each of the upper or lower blades, respectively, and the axis to the a proximal end of each of the upper or lower blades respectively is 0-60°.