CENTRIFUGAL FAN IMPELLER Russian patent published in 2015 - IPC F04D29/28 

FIELD: machine building.

SUBSTANCE: impeller contains carrying and covering disks, and installed between them forward bent main and additional shortened blades. At side of the work surface of each of the additional shortened blades with the convergent clearance relatively to them the backward shortened blades are installed in form of the cylindrical perforated surface with curvature radius below the curvature radius of the additional shortened forward bent blades, and with curvature centres located on circle with radius exceeding radius of circle of curvature centres of the forward bent main and additional shortened blades.

EFFECT: increased pressure produced by the impeller of the centrifugal fan, and its efficiency due to formation on the work surface of the additional shortened forward bent blades of the stable vortex source, acting on the flow in between blades channel of the impeller at the side of the rear surface of the main and additional shortened forward bent blades.

2 cl, 2 dwg