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Variable cross-section perforated double-layer sandwich broadband sound-absorbing panel

A sound-absorbing board and variable-section technology, applied in layered products, paper/cardboard layered products, chemical instruments and methods, etc., can solve problems such as narrow sound-absorbing frequency bands, widen the sound-absorbing frequency band, and improve sound-absorbing performance. , the effect of simple production process

Inactive Publication Date: 2011-12-28
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing wooden sound-absorbing panels have a narrow sound-absorbing frequency band, the present invention further provides a variable-section perforated double-layer sandwich broadband sound-absorbing panel

Method used

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  • Variable cross-section perforated double-layer sandwich broadband sound-absorbing panel
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  • Variable cross-section perforated double-layer sandwich broadband sound-absorbing panel

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine Figure 1 to Figure 5 Explain that the variable cross-section perforated double-layer sandwich broadband sound-absorbing panel of this embodiment includes a panel 1, an upper core layer 2, a paper thin layer 3, a lower core layer 4, and a back plate 5. The panel 1, the upper core layer 2, the paper thin layer 3, the lower core layer 4 and the back plate 5 are bonded together from top to bottom in sequence; the panel 1 is uniformly processed with a plurality of through holes along the thickness direction, each A through hole is made up of small-diameter circular hole 1-1 and large-diameter circular hole 1-2 or conical hole 1-3, and described small-diameter circular hole 1-1 is offered on the front of panel 1, and described large-diameter circular hole 1-2 or conical hole 1-3 is provided on the back side of panel 1, and the aperture diameter of described small-diameter circular hole 1-1 is equal to the small end aperture of conica...

specific Embodiment approach 2

[0021] Specific implementation mode two: combination figure 1 , figure 2 and Image 6 Note that the perforation rate of the panel 1 in this embodiment is 3-10%, and the perforation rate is the percentage of the sum of the areas of all through holes on the panel to the panel area. The panel 1 with a perforation rate of 3-10%, the core layer 2 with a chamber volume ratio of 0.8-0.9, and the core layer 4 with a chamber volume ratio of 0.8-0.9 are combined to greatly improve the absorption. sound rate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific implementation mode three: combination Figure 1 to Figure 5 Note that, in this embodiment, the diameter of each small-diameter circular hole 1-1 is 1-10 mm; the diameter of each large-diameter circular hole 1-2 is 3-20 mm. Others are the same as in the first or second embodiment.

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Abstract

The variable cross-section perforated double-layer sandwich broadband sound-absorbing panel relates to a sound-absorbing panel. In order to solve the problem that the existing wooden sound-absorbing panels have a narrow sound-absorbing frequency band. The panel, the upper core layer, the thin paper layer, the lower core layer and the back panel are bonded together from top to bottom in sequence. There are multiple through holes uniformly distributed along the thickness direction on the panel, and each through hole consists of a small diameter round hole. Composed of large-diameter round holes or conical holes, small-diameter round holes are set on the front of the panel, large-diameter round holes or conical holes are set on the back of the panel, and the diameter of the small-diameter round hole is equal to the diameter of the small end of the conical hole. The upper and lower core layers are both honeycomb core layers. The honeycomb core layer is composed of multiple hexagonal cylinders spliced ​​together. The inner cavity of each hexagonal cylinder is a honeycomb cavity. The multiple honeycomb cavities on the upper core layer communicate with the multiple honeycomb cavities on the lower core layer and the multiple through holes on the panel. The invention is used for indoor places where architectural design has higher requirements on acoustics.

Description

technical field [0001] The invention relates to a sound-absorbing panel, which belongs to the technical field of sound-absorbing. Background technique [0002] With the continuous development of large-scale industrial production, noise pollution has become one of the three major pollutions alongside air pollution and water pollution, and has been listed as the main problem of environmental pollution control in the 21st century. Noise affects normal work order and work efficiency, and also affects people's daily life and physical and mental health. Controlling noise has become a top priority for human beings. [0003] Sound absorption is one of the main measures of noise control. At present, inorganic fiber porous sound-absorbing materials such as mineral wool and glass wool are generally used as decorative materials for indoor sound absorption. During the installation and construction process, they are brittle and easy to break to form dust that pollutes the environment, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/12B32B3/24B32B29/00
Inventor 郭禾苗于海鹏
Owner NORTHEAST FORESTRY UNIVERSITY
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