Composite noise reduction board and noise reduction device

Abstract

The invention provides a composite noise reduction board and a noise reduction device. The composite noise reduction board comprises a noise absorption layer and a metal sound insulation layer. The sound absorption layer is provided with sound absorption apertures, and the cross section of the metal sound insulation layer has a C-shaped structure. The sound absorption layer is disposed in the C-shaped structure of the metal sound insulation layer in a composite way. The metal sound insulation layer with / having the C-shaped structure is used to insulate sounds from a noise source, and the sound absorption layer having the sound absorption apertures disposed in the C-shaped structure of the metal sound insulation layer is used to absorb the noises, and then the high-efficiency sound-absorption noise reduction processing of the noise source is realized, and therefore the composite noise reduction board has advantages of concise structure, economy, environmental protection, wide application range, and ability of facilitating assembly.

Description

technical field [0001] The invention relates to the technical field of noise control, in particular to a composite noise reduction board and a noise reduction device. Background technique [0002] At present, noise pollution has been regarded as one of the main environmental pollutions, which is in urgent need of treatment. In particular, traffic noise, industrial noise and construction noise mainly exist in densely populated cities. Noise pollution brings a lot of inconvenience to people's work and life, and even seriously affects their health. The country has also issued many related policies on governance. A series of noise standards and regulations have been formulated. [0003] In the prior art, a muffler or a sound insulation cover is usually used for noise reduction treatment, but the muffler has extremely high requirements on the installation environment, and the cost is high. The sound insulation cover usually seals the noise source equipment in a small space, maki...

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Problems solved by technology

[0003] In the prior art, a muffler or a sound insulation cover is usually used for noise reduction treatment, but the muffler has extremely high requirements on the installation environment, and the cost is high. The sound insulation cover usually seals the noise source equipment in a small space, making it Separated from the surrounding environment to reduce the impact of noise on the environment, and the existing sound insulation enclosures usually use perforated panels or multi-layer composite sound-absorbing panels, the usual practice is to composite sound-absorbing materials and sound-insulating materials Together, this kind of multi-layer composite sound-absorbing panel has many consumables, complex structure, and high cost. In practical engineering applications, it is also limited by space. It is not suitable for moving noise sources, and installation and construction are inconvenient. The sound effect is not good

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