Silencer attenuating a noise from a noise source to be ventilate

Details Silencer attenuating a noise from a noise source to be ventilate Silencer attenuating a noise from a noise source to be ventilate

1991-04-26

1993-10-19

Wayner, William E.

Refrigeration

Muffler or sound dampener

181206, 381 71, 417312, F01N 106, A61F 1106

Patent

active

052534863

ABSTRACT:
A silencer attenuating a noise from a noise source to be ventilated of this invention comprises a machine compartment with a one-dimensional duct configuration whose sectional dimension is sufficiently small in comparison with the wavelength of the noise to be attenuated, a compressor and/or other machinery disposed within the machine compartment, an opening for dissipation of heat as disposed in a wall of the machine compartment and opening in a direction generally perpendicular to the direction of advance of sound within the machine compartment, a vibration pickup for detecting the vibration of the machinery corresponding to the output noise of the machinery, and a control circuit for processing output signals from the vibration pickup to drive a sound generator such as a speaker. The sound generator outputs a controlling signal dependent on the machine noise to cancel the noise about to emerge from the machine compartment.

REFERENCES:
patent: 3612213 (1971-10-01), Piko
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4044203 (1977-08-01), Swinbanks
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 5010739 (1991-04-01), Isshiki

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