Patent ID: 11965521
Assignee: EBM-PAPST MULFINGEN GMBH & CO. KG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A fan blade for a radial fan comprising an inflow edge and an outflow edge, the fan blade has, at least in one section, a wavy inflow edge with a periodically repeating waveform of a period length A, which is different from a sinusoidal or nearly sinusoidal waveform, in particular is different from a sinusoidal or nearly sinusoidal waveform having equal period length A;
the repeating waveform forms, per period, two adjacent wave troughs between two flanks extending toward one another obliquely to the flow direction and the obliquely extending wave flanks extend at a steeper tangential angle in relation to the flow direction in or close to their flank center and form steeper flanks in relation to the flow direction in comparison to two extending wave flank in a sinusoidal waveform;
the repeating waveform forms, per period, two adjacent wave troughs, between two flanks extending toward one another obliquely to the flow direction, with a wave peak located in between the two wave troughs, that extends against the flow direction in the direction of the inflow-side front edge; and
peak-trough value of the wave peak, which is located directly between two adjacent wave troughs, is approximately 10% to 80% in absolute value of the peak-trough value of the directly adjacent wave peak(s).