SHOP VACUUM CLEANER NOISE SUPPRESSOR Russian patent published in 2017 - IPC G10K11/168 F01N1/00 F01N1/24 A47L9/00 

FIELD: machine engineering.

SUBSTANCE: suppressor includes a housing, consisting of a cylinder shell, rigidly connected to the end circular plates with inlet and outlet nozzles. The aerodynamic body perpendicular to the direction of flow has at least three reactive chamber formed by circular discs with holes, the holes in the disks alternately offset relative to the housing axis so that the openings do not coincide in the two adjacent disks. In this case three successively connected jet chamber are coupled to the inlet housing and with the chamber and the outlet. In this case the annular chamber is formed by a perforated disc and a circular end plate, which are interconnected by a central sleeve whose inner surface is lined with sound-absorbing material, and a coaxial cylindrical shell. In this case one of the discs facing towards the inlet pipe, is lined with sound-absorbing element round. The ratio of body length L₁ to its diameter D is within the optimal values range L₁/D=3.5…4.0; and the ratio of housing diameter D to the diameter of outlet nozzle D₁ is within the optimal values range D/D₁=4.5…5.5; and the ratio of housing diameter D to the diameter of the discs hole d is within the optimal values range D/d=5.0…6.0; and the ratio of housing diameter D to the chamber length L_C is within the optimal values range D/L_C=2.0…4.5. The housing is made of structural materials, coated on its surface on one or both sides with a soft vibration damping material, wherein the ratio between the thickness of the lining and vibration damping coating lies in the optimal range of values of 1: (2.5…3.5).

EFFECT: improved efficiency of noise suppression.

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