Noise attenuating apparatus for modulating air flow

Details Noise attenuating apparatus for modulating air flow Noise attenuating apparatus for modulating air flow

1980-12-16

1983-08-23

Makay, Albert J.

Valves and valve actuation

Rotary valves

Ball valve

98DIG10, 251 5, 251 611, F24F 1310

Patent

active

043997392

ABSTRACT:
A distribution duct for conditioned air has elongate outlet slots which are opened and closed by a sound absorbing foam pad controlled by inflatable air bladders. The duct walls adjacent the slots are generally parallel to the face of the pad to create thin air flow channels which effect attenuation of noise when the pad is fully or partially open. When the bladders are fully inflated, they press the pad into the slots and into tight sealing contact with the slot edges.

REFERENCES:
patent: 2829581 (1958-04-01), Rumer, Jr.
patent: 3434409 (1969-03-01), Fragnito
patent: 3556465 (1971-01-01), Little
patent: 3574310 (1971-04-01), Souriau
patent: 3796367 (1974-03-01), Rifkin
patent: 3967780 (1976-07-01), Traver
patent: 4014381 (1977-03-01), Clark
patent: 4077310 (1978-03-01), McCabe, Jr. et al.
patent: 4077567 (1978-03-01), Ginn et al.

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