TUBULAR NOISE SUPPRESSOR Russian patent published in 2010 - IPC F01N1/00 

FIELD: machine building.

SUBSTANCE: noise suppressor consists of cylinder case with end inlet and outlet branches, of sound absorber located between cylinder case and perforated element and of acoustic transparent material installed between perforated element and sound absorber. The sound absorber contains a rigid wall whereto a shaped layer of a triangle profile out of sound absorbing material is attached with air gap. Opposite to it the shaped layer of a triangle profile out of sound absorbing material is attached to the perforated element of the case with air gap. Between the shaped layers there is ensured an air interval, and a recess of one layer is opposite to a projection of another. Also surfaces of profiles are made congruent and are offset at value equal to half of length of triangle base. Density of sound absorbing material of shaped layers is different: density of the layer secured to the rigid wall is higher, than density of the layer attached to the perforated element of the case.

EFFECT: increased efficiency of noise suppressing.

3 dwg