RADIAL-FLOW FAN Russian patent published in 2010 - IPC F04D29/42 F04D17/00 B60H1/00 

FIELD: engines and pumps.

SUBSTANCE: radial-flow fan comprises casing and impeller fitted in said casing to revolve about preset rotational axis. Casing has axial inlet for air to be sucked in and tangential outlet for air to be forced there through. Said tangential outlet is formed by first edge, parallel to rotational axis and located nearby impeller, second edge opposite to first edge and located at a distance from impeller, and two lateral edges, each jointing first edge with second edge. Fan comprises also extending section arranged nearby outlet and formed by first edge and having convex surface inside aforesaid casing and transition surface between said convex surface and first edge. Fan additionally comprises ledge that passes along every lateral edge to wards opposite lateral edge to form common rounded structure along second edge and two lateral edges.

EFFECT: reduced noise due to reduced air swirling at fan outlet.

11 cl, 10 dwg