MULTILAYER ACOUSTIC PANEL Russian patent published in 2017 - IPC E04B1/84 

FIELD: construction.

SUBSTANCE: multi-layered acoustic panels, containing a frame and a noise-attenuating insert located in his inner cavity, the frame is made in the form of a parallelepiped formed by the anterior and posterior panel walls, each of which has a U-shaped form, and on the front wall, there is a slit perforation, the perforation factor of which equals to 0.25 or more, wall panels are fixed between each other by shock-absorbing covers, and the noise-attenuating insert is made solid or consisting of at least two layers of noise-attenuating boards, in each of which at the angle α=50÷80° to their surfaces, perforation holes are made, with the axis of the perforation holes of the adjacent boards are angled 1.5α relative to each other, and the front and rear walls of the damper elements frame are made of stainless steel or galvanized steel sheet with a thickness of 0.7 mm with polymeric protective-decorative covering of "Pural" type 50 mcm thick or "Polyester" 25 mcm thick or aluminium sheet 1.0 mm thick and 25 mcm thick coating, with the ratio of the height (h) of the frame to its width (b) is in an optimal relation to values: h/b=1.0÷2.0; the ratio of the thickness s' of assembled frame to its width (b) is in an optimal relation to values: s'/b=0.1÷0.15; and the ratio of the thickness of the sound-absorbing material for thickness s' of assembled frame in an optimal relation to values: s/s'=0.4÷1.0.

EFFECT: improvement of sound-absorbing properties of the panel.

4 cl, 3 dwg