Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1997-08-20
2000-02-15
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181230, 181281, F01N 108
Patent
active
060241896
ABSTRACT:
A sound attenuating device is provided for use in reducing sound levels associated with a sound source, such as an internal combustion engine. The noise attenuating device, for example, is connected to the exhaust pipe of the engine and receives sound waves and a fluid flow of exhaust gas therefrom. The sound attenuating device includes a housing which defines an interior chamber, an inner deflector assembly extending centrally through the chamber, and a diverter arrangement near an inlet of the housing. The inner deflector assembly is formed from a longitudinal stack of spaced apart tapered deflectors such as inner cones which extend centrally through the chamber and define an annular passage radially between the inner cones and the housing wall. The diverter arrangement diverts the fluid flow to the annular passage. As a result, a relatively free flow of the fluid is permitted through the passage while sound waves are deflected between the housing and the surfaces of the inner cones whereby sound levels are attenuated.
REFERENCES:
patent: 1081348 (1913-12-01), Unke
patent: 1084883 (1914-01-01), Holzwarth
patent: 1760924 (1930-06-01), Watkins
patent: 2373231 (1945-04-01), Demuth
patent: 2609886 (1952-09-01), Harmon
patent: 4574914 (1986-03-01), Flugger
Copy of International Search Report dated Dec. 2, 1998 from PCT/US98/17453.
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