Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1979-04-02
1980-12-30
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181258, 181267, 181272, 181281, F01N 702, F01N 124
Patent
active
042418054
ABSTRACT:
An apparatus and method is provided for venting high pressure gas to a lower pressure region with a minimum of noise. A high pressure vent valve controls egress from a high pressure gas source. In order to limit the generation of noise downstream of the vent valve, at least one control orifice is provided which is configured to have a flow velocity through a throat section thereof of the speed of sound, and with a pressure downstream of the throat being the same as the throat pressure. In this manner, the pressure is reduced by about half at each control orifice, with no or little noise generation. Downstream of these sonic velocity control orifices, sound attenuating means including radially extended passages lined with sound-baffling structure are provided to reduce any residual noise in the flowing gas as it passes into the region of lower pressure.
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patent: 3635309 (1972-01-01), Nemeawsky et al.
patent: 3665965 (1972-05-01), Baumann
patent: 3724502 (1973-04-01), Hayner et al.
patent: 3813079 (1974-05-01), Baumann et al.
patent: 3823743 (1974-07-01), King
patent: 3917221 (1975-11-01), Kubota et al.
patent: 4109680 (1978-08-01), Lavender
Fuller Benjamin R.
Hix L. T,.
Vibration and Noise Engineering Corporation
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