SOUND ABSORBING ELEMENT FOR INDUSTRIAL PREMISES Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics and can be used for machine drive noise reduction, lining of manufacturing facilities and in other sound-absorbing structures. Technical result is achieved by the fact that the sound absorbing element for industrial premises comprises a smooth and perforated surfaces, between which a multilayer sound absorbing structure is arranged, it is made in form of rigid and perforated walls, between which layers of sound reflecting, and sound-absorbing materials of different density in two layers are arranged, wherein the layers of the sound-reflecting material are made of a complex profile consisting of uniformly distributed hollow tetrahedra that allow to reflect sound waves that fall in all directions, and which are located respectively about the rigid and perforated walls, and the layers of the sound-reflecting material are made of a heat-insulating material capable of maintaining a given microclimate indoors, sheet noise-proof material is used as a sound-absorbing material, the sheet noise-proof material is made on the basis of a magnesia binder with a reinforcing glass cloth or fiberglass, or polyester, or a porous sound-absorbing ceramic material having a bulk density of 500÷1000 kg/m³, and consisting of 100 pts.wt of pearlite with a grain diameter of 0.1÷8.0 mm, 80÷250 pts.wt of one of sintering materials selected from the group consisting of fly ash, slag, quartz, lava, stones or clay as the main material, 5÷30 pts.wt of an inorganic binder, after sintering the mixture of pearlite particles communicating holes are formed between contact surfaces so that inner pores are interconnected, while a material based on aluminium-containing alloys is used as a sound-reflecting material, followed by filling with titanium hydride or air with a density within 0.5…0.9 kg/m³ with the following strength properties: compressive strength within 5…10 MPa, bending strength within 10…20 MPa, for example foam aluminium, or soundproofing plates based on a glass staple fibre of the “Shumostop” type with a material density of 60÷80 kg/m³, characterized in that the layers of the sound-reflecting material are perforated and arranged symmetrically with respect to the layers of sound-absorbing material of different densities, wherein the layers of the sound-reflecting material are made of a complex profile consisting of uniformly distributed hollow tetrahedra that allow to reflect sound waves that fall in all directions.

EFFECT: technical result is increase in the efficiency of acoustic suppression and reliability of the structure in general.

1 cl, 1 dwg, 1 tbl