Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1990-12-14
1992-07-07
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62296, 181206, 381 71, A61F 1106, H03B 2900
Patent
active
051272350
ABSTRACT:
In a low noise refrigerator, a rotary compressor constituting a noise source is arranged within a machine chamber provided with an opening in one location, which chamber has a one-dimensional duct construction having a cross-sectional dimension which is small relative to trhe wavelength of the noise which is to be reduced. A vibration pick-up being located in the vicinity of the rotary compressor. The vibration pick-up detects compressor vibrations which correlate to the compressor noise, in the tangential direction of the compressor. There is provided a control circuit that processes the output signal of the vibration pick-up. In the machine chamber, a sound generator is driven by the output signal of the control circuit to generate a control sound, so that the compressor noise which tries to issue from the opening is canceled by the control sound.
REFERENCES:
patent: 2043416 (1936-06-01), Lueg
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4044203 (1977-08-01), Swinbanks
patent: 4153815 (1979-05-01), Chaplin et al.
IBM Technical Disclosure Bulletin, vol. 31, No. 8, pp. 256-258 "Audible Noise Suppression".
Nakanishi Keiji
Sekiguchi Yasuyuki
Kabushiki Kaisha Toshiba
Wayner William E.
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