Sound attenuating device and insert

Details Sound attenuating device and insert Sound attenuating device and insert

1995-02-17

1997-08-19

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181265, 181275, 181281, F01N 108

Patent

active

056591586

ABSTRACT:
A sound attenuating muffler useful with an internal combustion engine, preferably for marine applications, contains an insert comprising an arrangement of annular sound reflecting surfaces defining an inner chamber into which engine exhaust gases flow in a first direction and one or more directors to divert the axial flow of gases and sound waves in a second direction past these sound reflecting surfaces. As the sound waves are reflected off of these surfaces back into the muffler interior, attenuation of the sound is achieved. One or more additional inserts may be placed downstream from the first insert for additional sound attenuation. Each of the inserts may be in the form of discrete sound reflector rings or as a continuous helix. A method of assembling the component parts of the insert is also described.

REFERENCES:
patent: 981584 (1911-01-01), Miller
patent: 981770 (1911-01-01), Kreis, Jr.
patent: 4424882 (1984-01-01), Moller
patent: 4643272 (1987-02-01), Gaffrig
patent: 4679597 (1987-07-01), Stein
patent: 4683978 (1987-08-01), Venter
patent: 4809812 (1989-03-01), Flugger

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