Patent ID: 7584821
Filing Date: 2009-09-08
Classification: F02M

Abstract:
1. A Helmholtz resonator assembly comprising: a housing partially defining at least one volume; a first sleeve member disposed within said housing and further defining said at least one volume; a second sleeve member generally coaxially disposed within said first sleeve member and defining a passage through which a gas may pass; wherein said second sleeve member is selectively and variably movable with respect to said first sleeve member between a first position and a second position; at least one orifice defined by said first sleeve member; at least one other orifice defined by said second sleeve member; wherein said second sleeve member substantially blocks said at least one orifice to prevent direct and indirect communication between said at least one volume and said passage when said second sleeve member is in said first position; wherein said at least one other orifice of said second sleeve member aligns with said at least one orifice to allow communication between said at least one volume and said passage when said second sleeve member is in said second position; and wherein said at least one orifice, said at least one other orifice, and said at least one volume cooperate to form at least one Helmholtz resonator when said at least one other orifice of said second sleeve member aligns with said at least one orifice.