SINGLE-PIECE SOUND ABSORBER Russian patent published in 2008 - IPC E04B1/84 

FIELD: construction.

SUBSTANCE: single-piece sound absorber consists of a rigid frame suspended to the ceiling of an industrial building, with sound-absorbing material inside the frame, wrapped in an acoustically transparent material. The frame is designed as a cup with perforated lateral surface and a perforated bottom; a perforated cover is attached to the top part of the cup; a fastener in the form of a cable piece is attached to the cover, for fastening the cup to the industrial building ceiling. Inside of the frame, a central rod if fixed rigidly in the cup bottom along the cup axis; on the rod, at least one internal partition is installed so that it can be latched at a certain central rod height; forming resonant cavities with the other partition(s), the cup cover, and the cup bottom; sound-absorbing material wrapped in acoustically transparent material is located in at least one of the cavities. The perforation is slotted, the lateral surface, the bottom, and the frame cover have the same perforation ratios equal to or more than 0.3, and the internal partition has a perforation ratio less than or equal to the perforation ratio of the lateral surface, the bottom, and the frame cover; the lateral surface of the perforated cup has a rectangular or square shape in the section perpendicular to the cup axis. The frame is made of stainless steel or galvanised sheet with a thickness of 0.7 mm, with polymeric protective and ornamental coating with a thickness of 50 mcm or 25 mcm, or of aluminium sheet with a thickness of 1.0 mm and a coating thickness of 25 mcm.

EFFECT: increase in sound absorbing efficiency and performance enhancement.

4 cl, 1 dwg