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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,

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.

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A rotary compressor comprising: a compression chamber having a cylindrical housing: a roller mounted for eccentric rotation within said cylindrical housing; a discharge port communicating with said compression chamber; and a resonator of the branch type, said resonator communicating with said compre

A rotary compressor comprising: a compression chamber having a cylindrical housing: a roller mounted for eccentric rotation within said cylindrical housing; a discharge port communicating with said compression chamber; and a resonator of the branch type, said resonator communicating with said compression chamber and being Helmholtz resonator having a bandwidth centered at within 20% of 4 kHz, and; wherein said Helmholtz resonator has a cavity of volume V, and a passage having length 1 and cross-sectional area Sb and a passage extending to the cavity, and wherein the square root of V in mm3/2 multiplied by 0.125/mm3 is within k percent of the square root of Sb/1 mm½, where k is not greater than 10%.