Search International and National Patent Collections

1. (WO2015124487) FAN COMPRISING AN IMPELLER WITH BLADES

Pub. No.:    WO/2015/124487    International Application No.:    PCT/EP2015/052939
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Fri Feb 13 00:59:59 CET 2015
IPC: F04D 29/38
F04D 29/66
Applicants: EBM-PAPST ST. GEORGEN GMBH & CO. KG
Inventors: STADLER, Michael
RAGG, Peter
LAUFER, Wolfgang
Title: FAN COMPRISING AN IMPELLER WITH BLADES
Abstract:
A fan comprises an impeller (120) that is provided with blades (26, 28, 30, 32, 34; 126). The blades are designed in such a way that the load on individual blades differs during operation of the fan. This variable load on the blades allows the frequencies associated with the blade passing frequency (BPF) of the fan to be spread across a wider frequency spectrum and thus be less disturbing.