Fan with noise reduction

Details Fan with noise reduction Fan with noise reduction

1976-02-05

1978-05-16

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416236A, F04D 2938

Patent

active

040896188

ABSTRACT:
A fan for moving a gaseous fluid, e.g., air, is described in which the high audible frequency noise resulting from the phenomenon occurring at the trailing edges of the blades, known as vortex shedding, is reduced. This is accomplished by notching an edge of each of the blades so that the pattern of vortices leaving the blade, which causes the noise, is disturbed and a turbulence condition engendered. The turbulence distributes the pressure fluctuations resulting from movement of the blades through the fluid over a relatively broad band of frequencies and reduces the annoying noise frequencies. Various notch configurations are disclosed.

REFERENCES:
patent: 1717745 (1929-06-01), Tismer
patent: 1861065 (1932-05-01), Poot
patent: 2013473 (1935-09-01), Meyer et al.
patent: 2238749 (1941-04-01), Peltier
patent: 2532753 (1950-12-01), Beman
patent: 2899128 (1949-08-01), Vaghi
patent: 3776363 (1973-12-01), Kuethe
patent: 3779338 (1973-12-01), Hayden et al.

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