Noise soundproof room fan

Action principle acoustic cover of the noise source is enclosed in a small space, it is a building envelope to reduce external radiation noise. Therefore, the overall structure of acoustic enclosures must be designed according to the structure of the sound source device, and there is no particular fixed shape or structure. Generally requires the design using light, sound good performance composite structures within the acoustic enclosure must attach high absorption coefficient of sound absorption lining and so on. According to some of the operating characteristics of specific devices, will use as isolator, double-sealed structure, with a vent structure, plus sound-absorbing materials, ventilation pipe structure and so on. Design features acoustic cover noise effect, widely used in noise control engineering in the design and selection of acoustic enclosures should pay attention to the following aspects: 1, cover the walls must have sufficient sound insulation, and for ease of manufacture and installation service , should adopt 0.5-2mm thick steel or aluminum and other thin dense material. 2, steel or aluminum and other thin material for the cover wall, on the wall to be reinforced, coated stickers damping layer, to suppress and weaken the resonance and will fit in. 3, can not have rigid contact between the cover and the sound source device and seat, in order to avoid the formation of "sound bridge", resulting in reduced sound insulation. At the same time, the formation of isolation between the insulation cover and the ground, in order to reduce the solid sound. 4, etc. When opened soundproof windows and doors, ventilation and cable lines, crevices must be sealed and should damping, sealing measures around the pipeline. 5, to increase the inner cover acoustic treatment, the use of porous bulk material, care should be a solid surface. 6, in the form of proper housing, minimize the use of square parallel cover wall to prevent air acoustic standing wave effect within the hood, while the larger space should be left between the wall and the cover device, usually the device footprint of 1 / 3 or more, each of the inner wall surface space and equipment must be located no less than 10cm, in order to avoid coupling resonance, so reducing the amount of noise. 7, when the quilt has a temperature of equipment needed ventilation and cooling measures should increase the muffler and other measures, the muffler to match the insertion loss of acoustic cover