초록 ▼

A muffler for reducing acoustic noise contained in a gas flow, such as created by internal combustion engines, air compressors, and blower manifolds. The muffler consists of a conventional sheet metal casing which has an inlet and an outlet at opposite ends thereof. A flow of gas containing acoustic

A muffler for reducing acoustic noise contained in a gas flow, such as created by internal combustion engines, air compressors, and blower manifolds. The muffler consists of a conventional sheet metal casing which has an inlet and an outlet at opposite ends thereof. A flow of gas containing acoustic noise flows from inlet to outlet. A plurality of spiral acoustic traps, each of which extend from bottom to top of the casing, have a central axis positioned perpendicular to the gas flow. An opening in each spiral acoustic trap extends into the gas flow to divert some gas into the trap, wherein the gas flows in a circular path so as to degrade and randomize the sound waves into heat, by utilizing a circular mixing process with increased gas retention time. Gas is drawn out of the acoustic trap through a series of vent holes in the acoustic trap on the back side of the acoustic trap opposite the opening, by utilizing a venturi effect created by part of the inlet gas flow which is split off into a peripheral gas flow to flow around the acoustic trap through a constricted area just ahead of the vent holes, created by the acoustic trap and the adjacent casing wall or adjacent trap, so as to create a low pressure zone at the vent holes to continuously draw gas out of the acoustic trap. The acoustic traps may be oriented in a single or multiple linearly extending staggered groups, with in-line or offset inlets and outlets.

대표청구항 ▼

[ I claim:] [1.] A muffler for attenuating acoustic noise in a gas flow, comprising:a casing;an inlet in said casing;an outlet in said casing, whereby gas flows in said casing from said inlet to said outlet;a plurality of spiral acoustic traps formed by spiral trap walls disposed in said casing, spa

[ I claim:] [1.] A muffler for attenuating acoustic noise in a gas flow, comprising:a casing;an inlet in said casing;an outlet in said casing, whereby gas flows in said casing from said inlet to said outlet;a plurality of spiral acoustic traps formed by spiral trap walls disposed in said casing, spanning between a pair of opposing top and bottom walls of said casing, and having a central axis substantially perpendicular to the general direction of said gas flow, each spiral having an entrance opening into said gas flow and a back side substantially opposite said entrance, with that of said gas flow which flows across said entrance comprising a main gas flow, and the remaining gas flow which passes on the back side comprising a peripheral gas flow; anda plurality of vents through said trap wall of each of said acoustic traps, said vents positioned on the back side of said trap such that said peripheral gas flow forms a low pressure zone at said vents, due to a venturi effect created by said peripheral gas flow passing through a narrowed area between said outside of said trap and an adjacent wall, so as to draw gas from the inside of said trap through said vents.