SOUND ABSORBING BAFFLE AND ARRANGEMENT FOR A BAFFLE

摘要

The present invention relates to a baffle for use in a silencer intended for ventilation ducts and to a sound damping arrangement of baffles. The baffle (2) according to the invention is of rectangular shape as viewed both from the side and in vertical cross-section transverse to its longitudinal direction, comprises an acoustically damping material (10) disposed in a shape-stabilising frame arrangement and comprises in its longitudinal direction three zones represented by: a forward end portion (a) of tapering shape comprising the front edge (3) of the baffle and adapted to meeting and dividing an incoming air stream, a middle portion (b) having substantially the shape of a rectangular cuboid and provided with plane-parallel main surfaces (4) for the acoustically damping material (10) for absorbing noise from a passing air stream, and a rear end portion (c) of tapering shape comprising the rear edge (5) of the baffle and adapted to regulating the bringing together of the divided and sound-damped air stream. The sound damping arrangement comprises more than one baffle disposed with a constant gap width between main surfaces (4) of the respective middle portion (b) of adjacent baffles.