Ventilation fan with noise-attenuating housing

Details Ventilation fan with noise-attenuating housing Ventilation fan with noise-attenuating housing

1982-05-28

1985-04-02

Coe, Philip R.

Rotary kinetic fluid motors or pumps

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

415197, 98DIG10, F01D 526

Patent

active

045084866

ABSTRACT:
In a high-speed, high-volume ventilation fan, a noise-attenuating housing structure includes a perforated inner casing contained within a solid-walled outer casing. Filling the space between the inner and outer casings is a porous, sound-absorbing material. To prevent loss of downstream pressure, and therefore operational efficiency, due to leakages of air through the sound-absorbing material from the downstream side at the fan blades to the upstream side thereof, an annular anti-flow barrier is situated in the space between the inner and outer casings slightly downstream of the fan blades. The structure thus provides a high degree of noise attenuation without sacrificing operational efficiency.

REFERENCES:
patent: 3947148 (1976-03-01), Holt

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