SOUND-ABSORBING MEMBER Russian patent published in 2002 - IPC

FIELD: applicable in silencers installed in air conduit networks of the ventilation, air heating and air-conditioning systems, as well as facing panels of the inner surfaces of rooms. SUBSTANCE: acoustic waves spreading in the room from the noise source, spreading in the room from the noise source, having reached the sound-absorbing member in the form of panel 1 manufactured of glass wool on the side of side wall 2 facing inside the room, partially pass deep into panel 1 through the sections of surfaces that are not occupied by hollows, and in hollows - through the hollows and in hollows - through the sections of surfaces that are free of the coating by air-proof material 11. The loss of acoustic energy occurs due to its conversion to the thermal energy. At the same time part of acoustic waves that has reached the surface of side wall 2 gets onto the sections of hollow surfaces partially faces by air-proof material 11 (V-shaped or U-shaped grooves, or cylinder-shaped blind holes), is reflected from them and partially returns again to the layer of glass wool through the sections of hollows that are free of sheet zinc-plated steel and the surface of side wall 2 that is free of hollows, with subsequent dissipation of their energy. It results in an additional noise suppression. In the presence of hollows on the surface of second side wall 3 of the panel the effect of additional noise suppression is enhanced. Reflection of acoustic waves from the sections of hollows faces by air-proof material 11 and subsequent dissipation of their energy when the claimed sound-absorbing members are used in silencers, occurs not only on the side of the side walls, but also on the side of the end wall facing the sound source. EFFECT: enhanced noise suppression. 8 cl, 9 dwg