INDUSTRIAL VACUUM CLEANER MULTI-CHAMBER SOUND SUPPRESSOR Russian patent published in 2018 - IPC F01N1/04 

FIELD: acoustics.

SUBSTANCE: invention relates to the noise suppression equipment. Silencer contains a body consisting of a cylindrical shell rigidly connected to end round plates having inlet and outlet branch pipes, herewith in the body, perpendicular to the aerodynamic flow direction, there are at least three jet chambers formed by round discs with holes, wherein the holes in the discs are alternately displaced relative to the axis of the body in such a way, that the holes in two adjacent discs do not coincide, wherein three successively connected reaction chambers are connected to the inlet of the housing, in the housing the reactive chamber is arranged, which is located between combined chamber and sound-absorbing chamber, adjacent to the outlet branch pipe and end round plate, wherein the combined chamber is formed by the discs connected to each other by means of a central bushing coaxial with the cylindrical shell and with the inner surface lined with a sound-absorbing material, while one of the discs facing the inlet branch pipe is made perforated and lined with a sound-absorbing circular element that are also installed on the discs with holes forming the jet chambers, and the sound-absorbing chamber is formed by the cylindrical shell, the end round plate with the outlet branch pipe and the disc with a central hole coaxial with the central bushing of the combined chamber, wherein the sound absorptive chamber inner surfaces are lined with sound-absorbing annular element installed coaxially to the cylindrical housing, each of which is made in the form of a rigid and perforated walls, between which there are two layers: sound-reflecting layer adjacent to rigid wall, and adjacent to the perforated wall sound-absorbing layer, at that, the sound-reflecting material layer is made of a complex profile consisting of uniformly distributed hollow tetrahedra.

EFFECT: higher efficiency of noise suppression.

1 cl, 2 dwg