Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1984-09-27
1985-07-23
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181228, 181231, 181252, 181258, F01N 124
Patent
active
045304181
ABSTRACT:
An improved exhaust system (24) uses the entire length of the system in which to perform the essential functions of muffling noise and converting unburned hydrocarbons. The improved exhaust system (24) performs these functions with a relatively uniform minimum diameter along its length. The exhaust system (24) includes a uniform outer diameter pipe (26) and elements (44) of porous material (46) forming a plurality of filters (50) through which the exhaust gas flows and which attenuates sonic frequency sound waves in the exhaust. The elements (44) are preferably elongate strips which may be folded into rectangular filters (60) or elliptical filters (90). The rectangular filters can be folded sufficiently to form squares and the elliptical filters to form circles. The rectangular filters define passageways (62-68) between the edges of the filters and inner wall (70) of the pipe (26) which further attenuates exhaust noise through imbalances in the gas flow. The elliptical filters maintain continuous contact with the inner surface of the pipe. In a second embodiment, an exhaust system (110) includes a liner (112) having a plurality of airfoil baffles (114) extending into the gas flow to muffle the exhaust. A third embodiment is formed by an exhaust system (130) having a woven wire fabric (132) along its interior to attenuate the exhaust sounds. All of the filters or elements can be coated with alumina and a platinum group metal for catalytic converting.
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