Noise reduction of rotary compressor by proper location of disch

Details Noise reduction of rotary compressor by proper location of disch Noise reduction of rotary compressor by proper location of disch

1988-12-22

1990-06-12

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

With relatively movable partition member

418181, F04C 18356, F04C 2906

Patent

active

049328514

ABSTRACT:
Noise reduction is provided in a rotary compressor by selecting the location of the opening of the discharge port so as to minimize the transmission of noise by the discharge compressed gasses. In particular, the discharge port opening is located in the middle (i.e., in an axial direction) of the cylinder wall of the rotary compressor corresponding to a node in a first thickness mode standing wave. This corresponds to 1/4 wavelength relative to the thickness mode standing wave from the end plate. Additionally, the opening is located 1/4 wavelength from the corner or edge at which the sliding vane is positioned, this ensuring that the opening is at a node in a first cylindrical mode standing wave set up in the compression chamber. The discharge port includes a passage extending through the cylindrical wall and a passage extending through the end plate.

REFERENCES:
patent: 2020987 (1935-11-01), Ayres
patent: 2246272 (1941-06-01), Davidson
patent: 4483305 (1984-11-01), Gilmor

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