CUTOFF SILENCER Russian patent published in 2013 - IPC F02M35/14 F01N1/00 

FIELD: machine building.

SUBSTANCE: cutoff silencer, lower and upper cylindrical hollow housings connected to each other, the lower of which includes a lower cover plate attached to it and covering some part of fastening elements, two side cover plates closing side openings made in side wall of lower housing, and upper housing includes an upper flange and an opening made in side wall of upper housing; at that, silencer has a pipe located in the opening of upper flange, which is put on the pipe; pipe is located in cavities of lower and upper housings of silencer and in the opening of bottom of upper housing; lower end of pipe is fixed above bottom of lower housing with a gap between them; upper end of pipe is located in the opening of upper wall of upper housing, which is connected to side wall of upper housing, under bottom of upper housing there located with a gap in relation to the bottom are at least two arc-shaped plates; at that, bottom of upper housing is provided with openings connecting the cavity of lower housing to cavity of upper housing; arc-shaped plates enclose the pipe on its opposite sides so that air gaps are formed between concave arc-shaped end surfaces of plates and external surface of pipe, and air channels are formed between adjacent straight-line edges of arc-shaped plates; at that, many radial openings located in cavity of lower housing are made in lower part of pipe.

EFFECT: reduction of sound level and improvement of silencer tightness.