NOISE SUPPRESSOR Russian patent published in 2015 - IPC F01N1/04 

FIELD: machine building.

SUBSTANCE: noise suppressor contains casing connected with inlet and outlet branch pipes. The branch pipes are connected with central pipe made with perforation in form of at least three rectangular slits. The outlet branch pipe is made in form of disk with three holes in peripheral part. The central part is connected with central solid part of the disk, between the casing and central pipe there is sound-absorbing element with cavity connected with the disk holes. The sound-absorbing element is made as rigid and perforated walls, between which the layers of sound reflecting, and sound-absorbing materials of different density arranged in two layers are located. The sound-absorbing material layers are made with profile in form of uniformly distributed hollow tetrahedrons with possibility of reflection of the sound waves spreading to all directions.

EFFECT: invention increases efficiency of the noise suppression, excludes radial effect and penetration of the sound waves both along the suppressor axis, and through its both walls.

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