Patent ID: 7264446
Filing Date: 2007-09-04
Classification: F04D,F05D,Y10T

Abstract:
1. A centrifugal-fan impeller comprising: a plurality of vanes each parallel to a center axis and arrayed encompassing the center axis so that the vane outer radius an approximately round cylindrical reinforcing ring linking one end of said plurality of vanes, said reinforcing ring having a diametrical thickness of from ½ to 3 times said maximum thickness of each of said plurality of vanes, and as measured along the center axis, having a length at least 2 times the pitch of said plurality of vanes; wherein said plurality of vanes and said reinforcing ring linking the vanes at one end are formed unitarily by injection molding; and the thickness of each of said plurality of vanes in the region where each is connected to said reinforcing ring is said maximum thickness.