BULK PIECE SOUND ABSORBER Russian patent published in 2009 - IPC E04B1/84 

FIELD: construction.

SUBSTANCE: bulk piece sound absorber includes rigid frame in the form of two concentric bulk regular polygon surfaces suspended on hardware at the ceiling of industrial facility. External surface is perforated, internal surface is solid. Gap between the surfaces is filled with sound absorbing material wrapped in sound permeable material. The surfaces are interconnected by at least two resonance inserts with holes of different diametre. Internal cavity formed by solid internal bulk surface is divided by at least one partition to form at least two resonance cavities, at least one of which can be filled with sound absorbing material. Lights with power supply are placed inside resonance inserts.

EFFECT: enhanced efficiency of sound absorption, improved operational properties.

7 cl, 1 dwg