CENTRIFUGAL FAN IMPELLER Russian patent published in 2014 - IPC F04D29/00 

FIELD: machine building.

SUBSTANCE: centrifugal fan impeller comprises a supporting disk and a covering disk, set in-between profiled blades folded backwards, each of which is fitted by a vane attachment set on the working surface side in the outlet part zone with a converging gap in respect to the working surface of the blade and having concave working surface and convex end face surface and a swirl chamber communicating tangentially with the converging gap, on its convex end face surface. Outlet converging channels are provided from the swirl chamber, and inlet converging channels are provided to the swirl chamber entering it tangentially from the concave working surface of the vane attachment.

EFFECT: use of invention allows for significant increase of the aerodynamic load of a centrifugal fan.

2 cl, 2 dwg