PLATE-LIKE NOISE SUPPRESSOR TO CHANNEL FANS BY KOCHETOV Russian patent published in 2010 - IPC F01N1/24 F04C29/06 F24F13/24 

FIELD: machine building.

SUBSTANCE: invention refers to procedure of noise suppressing. The noise suppressor consists of case of rectangular cross section rigidly connected to inlet and outlet branches and of sound absorbing plates. The sound absorbing plates are made as a frame containing perforated sheets filled with sound absorber. The plates are arranged in the case at a specified step forming flat channels. Also each sound absorbing plate contains perforated walls. Sound absorbing profiled layers of triangular cross section out of sound absorbing material are attached to the perforated walls and are arranged opposite to them; this arrangement ensures an air gap between the profiled layers. Notably, a recess of one layer opposes projection of another. Surfaces of profiles are congruent and are arranged with a shift at value equal to half of length of triangle base.

EFFECT: increased efficiency of noise suppressing.

3 dwg