SOUNDPROOFING ENCLOSURE Russian patent published in 2018 - IPC E04B1/82 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to protective devices connected with safety precautions, in particular to means for noise reducing of machinery and equipment. Technical result is achieved by the fact that a sound-insulating guard comprising a casing mounted on a vibration-proof support made in the form of a box-like frame, between the walls of which a sound-absorbing lining is placed, is characterized in that the sound-absorbing lining is made with resonant inserts and comprises a smooth and perforated surface, between which there is a layer of sound-absorbing material of a complex shape, which is an alternation of solid areas and hollow sections, the hollow sections being formed by prismatic surfaces having in section a parallelogram shape, which inner surfaces have toothed texture, tips of the teeth turned inward the prismatic surfaces, and the edges of the prismatic surfaces are fixed to the smooth and perforated walls respectively, the cavities of the hollow sections formed by the prismatic surfaces being filled with a sound absorber, and between the complex shaped sound-absorbing material layer smooth surface and solid sections, as well as between the perforated surface and solid sections, resonance plates with resonant inserts are located, performing the “Helmholtz” resonators necks functions, while 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 is the improvement in the efficiency of acoustic suppression.

1 cl, 6 dwg