Patent ID: 8882467

Claim:
A centrifugal impeller comprising: a body having: a cover defining an air inlet at a central portion thereof; a plurality of vanes integrally formed on a surface of the cover, each vane having a radially inner end; and a hub adjoining the radially inner end of at least one of the plurality of vanes, and having a first axial end facing the air inlet of the cover and a second axial end opposite to the first axial end; and a back plate mounted to the plurality of vanes of the body opposite to the cover, the back plate being a flat sheet and having a radially inner portion attached to the hub, wherein the body is made of a homogenous plastic material by injection molding and formed as a single piece, and the back plate is made of metal; wherein the body further comprises an outer ring which is connected to radially outer ends of the plurality of vanes, and the back plate is arranged inside the outer ring; and wherein the outer ring has an axial length greater than an axial length of the back plate.