Gas conveying element with soft walls to insulate from and attenuate noises propagating in main channels

摘要

A gas duct (1) incorporates walls which absorb sound from the main passages (3). The wall consists of a flexible inner tube (9), a metal element (19, 20), an outer tube (11) and a flexible layer of material (12, 13) between the two tubes (9, 11). The novelty is that the inner tube (9) is fabricated from: a textile, metal wire; glass fibre; a woven synthetic, natural or ceramic fibre; a non-woven or a thin foil of polyurethane, polyamide or polytetrafluoroethylene or a combination of these materials. The material is joined on its outer face to weighty metal formers (19, 20). The tube (9) is made of a random combination of mineral fibres (12) and/or metal fibres (13) and/or chips and/or chips from entropy-elastic materials. The gas duct (1) direction of flow turns through at least 360[deg] between the inlet (2) and the outlet (5). Pref. the material chosen for the inner tube (9) depends upon the mechanical, chemical and calorific load on the gas within the duct.