ACOUSTIC PANEL 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. Acoustic panel consists of at least two sound-absorbing sections, each of which contains walls of corrugated perforated material, between which there are sound-absorbing elements. Walls of the corrugated material are made with slotted perforations made of stainless steel or galvanized sheet with a thickness of 0.7 mm with a polymeric protective and decorative coating of the Pural type with a thickness of 50 mcm, or Polyester with a thickness of 25 mcm or an aluminum sheet 1.0 mm thick and a coating thickness of 25 mcm. Sound absorbing sections are suspended on ropes by hooks. Each of the sound-absorbing elements is made with resonant inserts and comprises a smooth and perforated surface between which a layer of sound-absorbing material of complex shape is disposed. This layer is an alternation of solid areas and hollow sections. Hollow sections are formed by prismatic surfaces that are in their cross-section parallel to the plane of the drawing, have the shape of a parallelogram, whose inner surface has a toothed or wavy structure. Tops of the teeth face inside the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls. Cavities of hollow sections, formed by prismatic surfaces, are filled with a sound absorber. Between the smooth surface and solid sections of the layer of sound-absorbing material of a complex shape, as well as between the perforated surface and solid sections, resonant plates with resonant inserts that perform the functions of the Helmholtz resonator necks are located. Inside the hollow sections, the internal surfaces of which have a dentate structure, there are additional resonance elements made in the form of spherical shells, inner surface of which is connected by resonant inserts with cavities located between the perforated surface and the solid sections of the sound-absorbing element.

EFFECT: technical result consists in improving the acoustic characteristics in the low, middle and high frequency region and in providing dust repelling.

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