Noise reduction in a hermetic rotary compressor

Details Noise reduction in a hermetic rotary compressor Noise reduction in a hermetic rotary compressor

1996-07-03

1997-02-25

Thorpe, Timothy

Pumps

With muffler acting on pump fluid

181403, 417902, 418 63, F04B 3900, F04C 2906

Patent

active

056054475

ABSTRACT:
The present invention concerns a noise reduction method and a noise reduction device for a hermetic rotary compressor. It is designed to reduce the very high level of low frequency sound generated by the compressor by preventing the formation of reflected waves along the circumference which produce the resonant sound mode, and thus by preventing the amplification of the low frequency gas pulsations. In the present invention, the amplitude of the reflected waves that form the resonant sound mode is reduced by installing the muffler outlets at one half the wavelength of the reflected waves in the cavity of the compressor housing from the exhaust valve where the compressed gas from the cylinder enters the muffler. By positioning these outlets to face each other so that, of the pulsating gas components form these two outlets, those at the frequency of the reflected waves formed in the circumferential direction of the cavity of the compressor housing will undergo a 180.degree. phase shift and destructively interfere with each other.

REFERENCES:
patent: 4730996 (1988-03-01), Akatsuchi et al.
patent: 4927342 (1990-05-01), Kim et al.
patent: 4932851 (1990-06-01), Kim

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