초록 ▼

An assembly combining a catalytic converter with a spiral muffler, particularly for small internal combustion engines. In series are an expansion chamber, a venturi for air injection, a catalytic converter, and a phase-spreading spiral muffler. The expansion chamber promotes proper operation of the

An assembly combining a catalytic converter with a spiral muffler, particularly for small internal combustion engines. In series are an expansion chamber, a venturi for air injection, a catalytic converter, and a phase-spreading spiral muffler. The expansion chamber promotes proper operation of the venturi, as well as reducing engine exhaust back pressure and providing some noise reduction. The muffler has a spirally coiled exhaust channel dead-ended at its inner extremity, with an outer extremity serving as a muffled exhaust outlet. A distribution chamber is adjacent the spiral exhaust channel, sharing a common wall therewith, and a plurality of streamlined slotted openings spaced along the exhaust channel at different distances from the muffled exhaust outlet introduce gas from the distribution chamber into the spiral channel. Disclosed is a space efficient construction including a series-connected venturi and catalytic converter assembly mounted centrally and coaxially within a cylindrical expansion chamber, with elements of the muffler arranged coaxially around a projecting portion of the catalytic converter.

대표청구항 ▼

A device for treating exhaust gas from an engine which produces exhaust gas in periodic surges, said device comprising: an exhaust gas inlet; an expansion chamber for reducing periodic exhaust gas surges, said expansion chamber having an expansion chamber inlet connected to said exhaust gas inlet an

A device for treating exhaust gas from an engine which produces exhaust gas in periodic surges, said device comprising: an exhaust gas inlet; an expansion chamber for reducing periodic exhaust gas surges, said expansion chamber having an expansion chamber inlet connected to said exhaust gas inlet and an expansion chamber outlet; a venturi downstream of said expansion chamber outlet for drawing in and mixing atmospheric air with exhaust gas; a catalytic converter downstream of said venturi for oxidizing exhaust gas constituents; and a phase-spreading muffler downstream of said catalytic converter, said muffler including: a spirally coiled exhaust channel formed about a central axis, said exhaust channel having an inner extremity and an outer extremity, and said exhaust channel having a muffled exhaust outlet at said outer extremity, a distribution chamber adjacent said exhaust channel sharing a common wall with said exhaust channel, said common wall being perpendicular to the central axis, and said distribution chamber having an inlet for receiving exhaust gas from said catalytic converter, and said common wall having a plurality of openings spaced along said exhaust channel at different distances from said muffled exhaust outlet for introducing exhaust gas from said distribution chamber into said exhaust channel.