Patent ID: 7159692

Claim:
A silencer comprising a casing, one or more pipes or passages leading a flow of gas to said casing and means for leading gas from said casing, the silencer further comprising at least one internal chamber, one or more flow inlets to said chamber and one or more flow outlets from said chamber, and one or more flow distributing means connected to at least one of said one or more flow inlet and to said one or more flow outlet, said flow distributing means comprising one or more walls or profiles extending on a geometrical surface defining a boundary between an inner volume of said flow distributing means and said chamber, and one or more apertures for a flow of gas through said apertures and for leading gas either out of said inner volume into said chamber, or into said inner volume from said chamber, said apertures having a smallest cross-sectional transverse dimension s and a length L, said dimension s being at the maximum 0.2 times the smallest cross-sectional dimension D of the inlet or outlet to which the flow distributing means is connected, and said length L being at least the same as said dimension s, whereby said one or more aperture are formed so as to provide a flow-area widening in flow direction along at least part of the aperture length L, and wherein substantial pressure recovery takes place within said one or more aperture.