HELICAL-TYPE SOUND ABSORBING ELEMENT Russian patent published in 2018 - IPC E04B1/84 

FIELD: electronic engineering.

SUBSTANCE: invention relates to a helical-type sound absorbing element. Helical-type sound absorbing element comprising a smooth and perforated surface, between which there is a layer of sound-absorbing material of complex shape. Layer of complex shape is an alternation of solid sections and hollow sections. Hollow sections are formed by prismatic surfaces with cross-sections parallel to plane of drawing, parallelogram shape, which inner surface have toothed or wavy structure. Teeth tops face inside prismatic surfaces. Ribs of prismatic surfaces are secured on smooth and perforated walls respectfully. Cavities of hollow sections formed by prismatic surfaces are filled with a sound absorber. Between a smooth surface and solid sections of the layer of sound-absorbing material of 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 the Helmholtz resonators.

EFFECT: technical result is higher efficiency of sound proofing.

1 cl, 2 dwg