Electric fan

Details Electric fan Electric fan

1997-03-25

1999-07-06

Denion, Thomas E.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

4152083, 181231, 15326, F04D 2966

Patent

active

059190302

ABSTRACT:
An electric fan comprises: a radial impeller for expelling the air trapped therein out of the impeller; a diffuser having a multiplicity of air passages separated by air guides, the air passages adapted to receive the air expelled from the impeller; a fan case for covering the impeller and the air guides; at least one throughhole which is formed in the fan case for each of the air passages; and a silencer equipped with a multiplicity of silencer cavities each having a predetermined volume and communicating with a corresponding one of the air passages, the silencer covering the fan case. The silencer is provided either on top of or beneath the fan case. Because the volumes of these silencer cavities may be chosen arbitrarily such that the silencer cavities may absorb noise caused by the interference between the impeller and the air passages, even audible noise may be suppressed sufficiently.

REFERENCES:
patent: 2225398 (1940-12-01), Hamblin
patent: 4057370 (1977-11-01), Numata et al.
patent: 4065233 (1977-12-01), Torigoe et al.
patent: 4111615 (1978-09-01), Watanabe
patent: 4131389 (1978-12-01), Perrone et al.
patent: 5110266 (1992-05-01), Toshiyama et al.
patent: 5513417 (1996-05-01), Kim et al.

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