US 9,810,234 B2
Fan impeller
Henning Bähren, Lübeck (DE); Christian Hornhardt, Dänischenhagen (DE); Matthias Wolf, Kiel (DE); and Yingan Xia, Rieseby (DE)
Assigned to Punker GmbH, Eckernförde (DE)
Filed by punker GmbH, Eckernförde (DE)
Filed on Sep. 10, 2014, as Appl. No. 14/482,504.
Claims priority of application No. 13004398 (EP), filed on Sep. 10, 2013.
Prior Publication US 2015/0071782 A1, Mar. 12, 2015
Int. Cl. F04D 29/28 (2006.01); F04D 29/30 (2006.01)
CPC F04D 29/283 (2013.01) [F04D 29/281 (2013.01); F04D 29/30 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A fan impeller for conveying a gaseous fluid, comprising:
first and second supports; and
a plurality of deep-drawn sheet-metal blades having first and second axial end sections, each of the blades extending between the first and second supports and being respectively affixed to the first and second supports along the first and second axial end sections, the blades being arranged with a constant angular spacing in an annular space around a rotation axis;
wherein at least one of the blades comprises a sheet-metal part shaped to have a continuous boundary zone extending along a periphery of the blade and at least one inner zone surrounded by the boundary zone; and
wherein the sheet-metal part further comprises at least one bead that lies between the boundary zone and the inner zone along a curved path having at least a portion that is substantially L-shaped.