Acoustic treatment for fans

Details Acoustic treatment for fans Acoustic treatment for fans

1976-06-14

1979-11-13

Tomsky, Stephen J.

Acoustics

Sound-modifying means

Combined

181222, 181225, 181231, 181286, 181292, 415119, F01N 306, F01N 104, G10K 1104, F01D 510

Patent

active

041740203

ABSTRACT:
A centrifugal fan is treated acoustically by the provision of tuned noise absorption cavities preferably including absorbent infill between an acoustically permeable scroll and casing of the fan. Alternatively, or in addition an acoustically absorbent panel structure is provided in spaced confronting relationship with the inlet port of the fan. The panel structure has an acoustically permeable facing spaced from a rigid backing and the space may be divided into noise absorption cavities and specifically Helmholtz type absorption cavities, the absorption bands of which are broadened by including acoustic infill. It is most advantageous to provide a multiplicity of Helmholtz absorption cavities tuned to respective different center frequencies of their acoustic absorption bands.

REFERENCES:
patent: 2143100 (1939-01-01), Anderson
patent: 2160666 (1939-05-01), McMahan
patent: 2164365 (1939-07-01), Wilson
patent: 2171341 (1939-08-01), McMahan
patent: 2225398 (1940-12-01), Hamblin
patent: 2975961 (1961-03-01), Rodick
patent: 3125286 (1964-03-01), Sanders
patent: 3174682 (1965-03-01), Wilfert et al.
patent: 3312389 (1967-04-01), Matsui
patent: 3415336 (1968-12-01), Arthur et al.
patent: 3819009 (1974-06-01), Motsinger
patent: 3820628 (1974-06-01), Hanson
patent: 3857453 (1974-12-01), Buttke et al.
patent: 3913702 (1975-10-01), Wirt et al.
patent: 3955643 (1976-05-01), Clark

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