AXIAL FAN Russian patent published in 2009 - IPC F04D29/38 

FIELD: engines and pumps.

SUBSTANCE: invention relates to axial pumps with vanes inclined in the fan rotation plane. Proposed fan revolves in direction (V) in plane (XY) about axis (2). It comprises central hub (3), multiple vanes (4), each comprising root (5) and head (6). Note here that vanes (4) are bounded by convex front edge (7) and concave rear edge (8). Note here that the said front edge (7) comprises the first circular arc segment, the closest to root (5), with its radius varying from 79% to 97% of the radius of head (6). It comprises also the second circular arc segment, closest to head (6) with its radius varying from 49.5% to 60.5% of the radius of head (6). Note here that the radius of transition between two aforesaid circular arc segments varies from 40% to 48.5% of the length of vane (4).

EFFECT: reduced noise.

18 cl, 4 dwg