SOUND-INSULATING ENCLOSURE Russian patent published in 2018 - IPC E04B1/82 E01F8/00 

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 the soundproofing enclosure comprises a casing mounted on a vibration isolating support made in the form of a box-like frame between the walls of which a sound-absorbing material is placed, and the casing is lined from the inside with a noise-absorbing element, characterized in that the noise-absorbing element is made with resonant inserts and comprises a smooth and a perforated surfaces. Between the surfaces there is a layer of sound-absorbing material of a complex shape. Layer of a complex shape is an alternation of solid sections and hollow sections, wherein the hollow sections are formed by prismatic surfaces that have a parallelogram shape in a section parallel to the plane of the drawing. Inner surfaces of the parallelogram have a toothed structure, the tips of the teeth turned inward the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls, the cavities of the hollow sections formed by the prismatic surfaces being filled with a sound absorber, and between a smooth surface and solid sections of a layer of sound-absorbing material of a complex shape, as well as between the perforated surface and solid sections, there are resonant plates with resonant inserts performing the functions of the neck of Helmholtz resonators.

EFFECT: technical result is higher efficiency of sound proofing.

1 cl, 5 dwg