Intake system with focusing means

An intake system adapted to supply a substantially intimately blended combustible mixture to a combustion machine, said system comprising conduit means for conducting a flowing stream of fuel and air to a combustion machine, upstream air entrance means for introducing air into said conduit means, upstream fuel inlet means for introducing fluid fuel into said conduit means, and mixing means downstream from said air entrance means and from said fuel inlet means, said mixing means comprising a peripheral flow focusing structure for redirecting the flow of at least substantially all peripheral portions of said stream from vectors of generally linear flow substantially adjacent the interior surface of said conduit means to vectors of inward flow interjacently substantially converging toward a central zone removed from said interior surfaces of said conduit means and removed form said focusing structure, said converging vectors of flow being effective to cause substantially intimate blending of the air and fuel of said flowing stream, said focusing structure being characterized by comprising wall means extending inwardly within said conduit means from substantially the entire intersection between an imaginary plane substantially transverse to said conduit means and the interior surface of said conduit means, said outermost peripheral edge of said wall means being fixed to said conduit means at said intersection, at least a portion of said wall means having the form of an approximately annular rise wall spaced from said interior surface of said conduit means and extending upstream within said conduit means from said imaginary plane, said rise wall including passage means extending therethrough substantially adjacent said imaginary plane and throughout said rise wall for the flow of said stream in said substantially converging fashion through said rise wall into the said central zone.