ACOUSTIC DEVICE Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly broadband and low frequency sound insulation, and can be used in all national industries for sound insulating of production equipment by sound absorption method. Technical result is achieved by the fact that the acoustic device consists of at least two sound-absorbing sections, each of which contains walls of corrugated perforated material, between which there are sound-absorbing elements, the walls of the corrugated material are made with slotted perforations of stainless steel or galvanized sheet with a polymeric protective decorative coating, or aluminum sheet, and the sound-absorbing sections are suspended on the cables by hooks, each of the sound-absorbing elements being made in the form of perforated plates, between which there are symmetrically arranged layers of sound-reflecting material, and in the center, between the layers of the sound-reflecting material, layers of sound absorbing materials of different density are placed, and between them a resonant insert with a set of bushings with resonant holes is located, being connected to the resonant inserts, and 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 at the perforated plates, the sound-absorbing member is lined on its entire surface with an acoustically transparent material, as a material of sound-reflecting layers, a material based on aluminum-containing alloys is used, followed by filling with titanium hydride or air, each of the sound-absorbing elements is made in the form of a rigid and perforated wall, between which a multi-layer sound-absorbing element is disposed, which is made in the form of two layers: one of which, adjacent to the rigid wall, is sound-absorbing, and the other, that adjacent to the perforated wall, is made with a perforation from a sound-reflecting material of a complex profile consisting of uniformly distributed hollow tetrahedra, while a material based on aluminum-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 aluminum, or soundproofing plates based on a glass staple fiber of the type "Shumostop" with a material density of 60÷80 kg/m³, or a material based on a magnesia binder with reinforcing fiberglass or glass-fibre mat.

EFFECT: technical result is the improvement of acoustic characteristics in the low, medium and high frequencies, while ensuring dust repelling.

1 cl, 3 dwg