Patent ID: 7905319

Claim:
A venturi muffler comprising an exhaust flow path along which exhaust gasses pass in a direction from an inlet to an outlet, a plurality of substantially annular chambers disposed in axially contiguous relationship to each other in surrounding relationship to the exhaust flow path, means for effecting the introduction of a fluid medium into an upstream substantially annular chamber portion of each substantially annular chamber, means for defining a substantially annular fluid media discharge passage in fluid communication between each substantially annular chamber and the exhaust flow path in surrounding relationship to the exhaust flow path, each annular fluid media discharge passage including an annular converging venturi flow creating a flow path portion converging in the direction of the exhaust flow path whereby the flow of exhaust gasses create a partial vacuum in said plurality of substantially annular chambers to effect sound attenuation, and a plurality of second substantially annular chambers disposed in axially contiguous relationship to each other and in surrounding relationship to the first-mentioned plurality of substantially annular chambers, and said first-mentioned and second substantially annular chambers are not in fluid communication with each other.