| 摘要 |
FIELD: physics.SUBSTANCE: device includes a frame filled with sound-absorbing material. The frame consists of a conical bottom part with a cover and a cylindrical top part which is attached to the cover of the bottom part of the perforated frame by vibration-damping spacers. The top part of the cylindrical perforated frame is pivotally connected to an element, through which the frame is attached to the required object. The cavities of the bottom and top parts of the frame are filled with sound-absorbing materials of different density. Around the cylindrical top part of the frame there is at least one helical sound-absorbing element of a single-piece absorber, made in the form of a cylindrical helical spring from a dense noncombustible sound-absorbing material. The helical sound-absorbing element is in the form of a hollow helical element formed by external and internal helical surfaces which form a cavity. The space formed by the external and internal helical surfaces is filled with sound-absorbing material. The sound-absorbing material used is a porous material, e.g. foam aluminium or metal-ceramic or metal-foam rubber or a material in the form of pressed crumbs of solid vibration-damping materials. The crumbs have a size of 0.3-2.5 mm.EFFECT: high effectiveness of soundproofing.2 cl, 4 dwg |
