INDUSTRIAL VACUUM CLEANER COMBINED NOISE SUPPRESSOR Russian patent published in 2016 - IPC F01N1/04 

FIELD: acoustics.

SUBSTANCE: invention relates to noise suppression. Silencer contains housing consisting of cylindrical shell, rigidly connected to end round plates, with inlet and outlet nozzles, respectively. In housing, perpendicular to aerodynamic flow direction, three reactive chambers are arranged, formed by round discs with holes, wherein holes in discs are alternatively shifted relative to housing axis so, that holes in two adjacent discs do not coincide. Series-connected reactive chambers are connected with housing inlet branch pipe, as well as with combined chamber and outlet branch pipe. Combined chamber is formed by circular perforated disc and round end plate, which are connected to each other by means of central bushing, which inner surface of lined with sound absorbing material, and coaxial to cylindrical shell. One of discs, facing inlet branch pipe, is lined with sound absorbing round element. Round sound-absorbing elements are also installed on discs with holes. Housing is made of structural materials with layer of soft vibration dampening material applied on its surface from one or two sides, mastic VD-17, or "Gerlen-D" type material. Ratio between thickness of material and vibration damping coating is within optimal range of values 1:(2.5…3.5).

EFFECT: technical result is higher efficiency of noise suppression.

1 cl, 3 dwg