COMPLEX NOISE SUPPRESSOR Russian patent published in 2010 - IPC F01N1/00 

FIELD: machine building.

SUBSTANCE: noise suppressor consists of cylinder case rigidly connected with end inlet and outlet branches, of sound absorber located between case and perforated element and of acoustic transparent material installed between element and sound absorber. Also a cylinder insertion is arranged along axis of the suppressor; a cowling of a conic shape is secured on one of end sides of the insertion; while the insertion is secured to inlet and outlet branches by means of webbing. Inside the insertion there are arranged the sound absorber and acoustic transparent material located between the element and the sound absorber. The sound absorber contains a rigid wall whereto a shaped layer is attached. The shaped layer consists out of sound absorbing material arranged at alternating semi-spherical surfaces or surfaces consisting of parts of sphere so, that between the wall and the layer of sound absorbing material there are formed air intervals with semi-sphere alternating with solid intervals. Also to the perforated element of the case there is attached the profiled layer consisting of sound absorbing material formed at alternation of semi-sphere-surfaces or surfaces consisting of parts of sphere so, that between the perforated element of the case with acoustic transparent material and the layer of sound absorbing material there are air intervals formed with semi-sphere and alternating with solid intervals. Notably, the shaped layer at the rigid wall is a mirror reflection of the shaped layer at the perforated element of the case relative to line of symmetry 0-0 of the integral shaped layer made at layers merging so, that a recess of one layer is located opposite to recess of another layer, and projection of one layer is located opposite projection of another layer. Layers can be interconnected along symmetry line 0-0, for example by means of glue, i.e. made as glued joint or made by double-side pressing as an integral shaped layer.

EFFECT: increased efficiency of noise suppressing.

3 dwg