TUBULAR RECTANGULAR NOISE SUPPRESSOR BY KOCHETOV Russian patent published in 2010 - IPC F16L55/33 F24F13/24 G10K11/168 

FIELD: machine building.

SUBSTANCE: invention refers to procedure of noise suppressing. The noise suppressor consists of a case, of inlet and outlet branches and of a sound absorber. The sound absorber includes a rigid wall. A profiled layer out of sound absorbing material is attached to this wall. Sound absorbing material is produced by alteration of semi-sphere or partially spherical surfaces so, that between the wall and the layer of sound absorbing material there are continuous intervals alternating with air intervals formed with semi-sphere. The profiled layer is also attached to a perforated element of the case. This profiled layer consists of sound absorbing material obtained at alternation of semi-sphere or partially spherical surfaces. This arrangement facilitates alteration of continuous and air gaps formed with semi-sphere between the perforated element of the case with acoustic transparent material and the layer of sound absorbing material. Also the profiled layer at the rigid wall is a mirror reflection of the profiled layer at the perforated element of the case relative to symmetry line 0-0 of the solid profiled layer.

EFFECT: increased efficiency of noise suppressing.

3 dwg