REACTIVE NOISE SUPPRESSOR OF SHOP VACUUM CLEANER Russian patent published in 2017 - IPC F01N1/00 

FIELD: machine engineering.

SUBSTANCE: noise suppressor contains the cylindrical body, rigidly connected to the end inlet and outlet branch pipes, and partitions, at least two discs with holes, forming the chambers, are installed in the body perpendicular to the aerodynamic flow direction. The discs holes are alternately misaligned relative to the housing axis, so that the holes in two adjacent discs don't coincide. The ratio of the body length L₁ to its diameter D is within the optimal values range L₁/D=3.5…4.0; and the ratio of the body diameter D to the outlet branch pipe diameter D₁ is within the optimal values range D/D₁=4.5…5.5; and the ratio of the body diameter D to the discs hole diameter d is within the optimal values range D/d=5.0…6.0; and the ratio of the body diameter D to the chamber length L_K is within the optimal values range D/L_K=2.0…4.5.

EFFECT: noise suppression efficiency improvement.

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