KOCHETOV'S ACOUSTIC SCREEN FOR SAFE OPERATOR WORK Russian patent published in 2015 - IPC E04B1/84 

FIELD: machine building.

SUBSTANCE: in acoustic screen contains a framework with slopes out of metal plates with installed in it sections of the acoustic panels, made as both noise reflecting light transparent, and non-transparent noise absorbing, wherein their layout in the acoustic screen can be of any combination of vertical and horizontal rows. Each of the opaque noise absorbing acoustic panels is made as rigid and perforated walls, between which the layers of sound reflecting and sound-absorbing materials of different density arranged in two layers are located. Layers of the sound reflecting material are made with complex profile, out of uniformly distributed hollow tetrahedrons, ensuring reflection of sound waves incoming from all directions, and located responsively at rigid and perforated walls, and layers of the sound reflecting material are made out of heat insulating material able to maintain the specified microclimate in room, and as the sound absorbing material the plates out of mineral wool of basalt base Rockwool, or mineral wool URSA, or basalt wool P-75, or glass wool lined with glass felt are used. The sound absorbing element over the full surface is lined with the acoustic transparent material, for example, glass fabric EZ-100 or polymer "poviden", and the perforated wall has the following perforation parameters: hole diameter - 3-7 mm, perforation percentage 10-15%. As per shape the holes can be made as holes having round, triangular, square, rectangular or diamond profile, wherein in case of unround holes the nominal diameter shall be maximum diameter of circle inscribed in the polygon.

EFFECT: improved efficiency of noise suppression.

3 cl, 5 dwg