Micro hole-aluminum silicate fiber sandwich type composite sound absorption board

Abstract

The invention discloses a micro hole-aluminum silicate fiber sandwich type composite sound absorption board and belongs to the field of noise control devices. The micro hole-aluminum silicate fiber sandwich type composite sound absorption board comprises a micro perforation board body, an aluminum silicate fiber mat and an aluminum silicate fiber board body which are sequentially arranged from outside to inside. The micro perforation board body is provided with a plurality of penetrating holes, and the periphery of the inner surface of the micro perforation board body is provided with baffles to form a first groove, and the first groove is matched with the aluminum silicate fiber mat. The periphery of the inner surface of the micro perforation board body is provided with a plurality of protrusions, and the periphery of the aluminum silicate fiber board body is provided with second grooves matched with the protrusions. The periphery of the inner surface of the aluminum silicate fiber board body is provided with a frame. According to the sound absorption board, through hole diameter resistance, material sound absorption, the interfacial effect between high-low volume weight materials and the like, the sound absorption frequency band of the sound absorption board is greatly widened, the sound absorption coefficient of the sound absorption board is 0.87-0.95, the compressive strength is high, and the fireproof grade is A; and the sound absorption board is suitable for absorbing of low-frequency electromagnetic noise of equipment such as a transformer and an electric reactor and high-frequency aerodynamic noise of a cooling fan.

Description

technical field [0001] The invention belongs to the field of noise control devices, in particular to a microporous-aluminum silicate fiber sandwich composite sound-absorbing panel. Background technique [0002] With the construction of the power grid and the advancement of urbanization, many substations in operation have gradually penetrated into the city center, and the level of the acoustic environment functional area at the station boundary has changed accordingly. The previous noise reduction design can no longer meet the limit requirements of the new environment, and noise complaints have gradually increased. . Because the State Grid adopts a "zero tolerance" attitude towards excessive noise, many substations in Yuncheng need to carry out noise control projects. After years of technology accumulation in noise reduction projects in the fields of transportation and construction, there are a large number of noise reduction materials and devices on the market. For example...

AI Technical Summary

Problems solved by technology

For example, the commonly used mineral wool sound-absorbing panels are cheap and have a high noise reduction coefficient. They are widely used in indoor sound-absorbing and noise-reducing projects, but they are often not effective in substation noise reduction; The composition of fan noise requires the material to have the performance of "low-frequency high-efficiency, wide-band effective". Mineral wool has a low low-frequency coefficient. Although it can be strengthened by increasing the thickness, it often occupies the maintenance space of the main transformer room and reactor room.

Materials such as polyester fiber and polyurethane foam have excellent low-frequency sound absorption performance, but poor high-temperature resistance

Resonant sound-absorbing materials have a high low-frequency sound absorption coefficient, but the high-efficiency sound-absorbing frequency band is too narrow to cover the high-frequency range

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