Compressor noise attenuation using branch type resonator

Details Compressor noise attenuation using branch type resonator Compressor noise attenuation using branch type resonator

1988-12-12

1990-05-22

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

With relatively movable partition member

418181, 181403, F04C 18356, F04C 2906

Patent

active

049273426

ABSTRACT:
A Helmholtz resonator is used in communication with the compression chamber of a rotary compressor in order to attenuate noise. The resonator concentrates the attenuation of noise in a frequency band around 4 kHz corresponding to the concentration of noise produced by a particular rotary compressor, this band also corresponding to the frequencies which the human ears are most sensitive to. The resonator branches off from the discharge port in an end wall of the compressor. The resonantor uses an easily machined cylindrical resonance cavity on the surface of the end wall, the resonance cavity also being bounded on one side by a cylindrical wall of the rotary compressor. The resonator significantly reduces the noise in a rotary compressor of a specific type commonly used for compressing refrigerant gases in a refrigerator.

REFERENCES:
patent: 4427351 (1984-01-01), Sano
Sano et al., 1984 International Compressor Engineering Conference, "Analysis of Hermetic Rolling Piston Type Compressor Noise, and Countermeasures", pp. 242-250, 1984.

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