WORKING BLADE OF FAN Russian patent published in 2013 - IPC F04D29/38 

FIELD: engines and pumps.

SUBSTANCE: in a working blade of a fan, outlets (10) and (11) of side sections (12) and (13) of an inner element (9) are made on a back (6) of a fin (2) of the blade in directions of the inlet (3) and outlet (4) fin edges. At the side of the inlet edge (3) on the back (6) of the fin, the edge (14) of the outlet (10) of the side section (12) of the inner element (9) is arranged from the inlet edge (3) of the blade fin at the distance L₁ of not more than 5B, where: B - width of the wall (7) of a trough (5) of the blade fin. Length L₂ of the tail (1) in the place of connection (17) with a disc (18) along the axis (19) is less by 15% than the length L₃ of the flow surface (20) of the tail.

EFFECT: by transfer of outlets of side sections of an inner element to a blade fin back, blade reliability increases, and its mass is reduced due to reduced length of a tail.

3 dwg