Multi-layer composite sound-absorbing plate beneficial to air transmission and sound insulation

Abstract

The invention discloses a multi-layer composite sound-absorbing plate beneficial to air transmission and sound insulation. The multi-layer composite sound-absorbing plate comprises a sound-absorbing plate body adopting the porous structure; the sound-absorbing plate body comprises an upper-layer top plate, a lower-layer bottom plate and side plates for sealing side ends between the upper-layer topplate and the lower-layer bottom plate; a barrel equal to the sound-absorbing plate body in length is arranged between the upper-layer top plate and the lower-layer bottom plate; the bottom of the barrel is fixed to the lower-layer bottom plate; the top of the barrel is open; a sound conducting channel fixed to the upper-layer top plate is arranged at the top; a spiral plate identical with the section of the barrel in shape is arranged in the barrel; the starting end of the spiral plate is located at the bottom and is fixed to the bottom surface of the barrel; upper through holes distributedin a straight line are formed in the positions, corresponding to the sound conducting channel, of the upper-layer top plate; inner through holes distributed in a straight line are formed in the single-side barrel wall of the lower half part of the barrel; and lower through holes located on the same side of the inner through holes and distributed in a straight line are formed in the lower-layer bottom plate. The invention aims to provide the composite sound-absorbing plate which can combine a porous material plate and a cavity structure and can enhance the noise reduction effect.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to a multi-layer composite sound-absorbing board favorable for ventilation and sound insulation. Background technique [0002] Conventional sound-absorbing materials and sound-absorbing structures include porous materials, film-like, and plate-like sound-absorbing materials, and resonance-structure-based sound-absorbing materials. For film and plate materials, the frequency bands usually used are mid-frequency bands and low-frequency bands, and the tuning frequency is relatively narrow. And it is often necessary to thicken the material or set a large-scale cavity behind it, especially in the field of furniture, which occupies a large area and is not easy to handle. If the floor area is too large and the sound-absorbing panel is too thick, the air permeability of the sound-absorbing panel will also be weakened. Therefore, there is an urgent need for a composite sound-absorb...

AI Technical Summary

Problems solved by technology

For film and plate materials, the frequency bands usually used are middle frequency band and low frequency band, and the tuning frequency is narrow

And it is often necessary to thicken the material or set a large-scale cavity at the back, especially in the field of furniture, which occupies a large area and is not easy to handle

If the floor area is too large and the sound-absorbing panel is too thick, the air permeability of the sound-absorbing panel will also be weakened

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