Microporous sound absorbing structure
A sound-absorbing and microporous technology, applied in the direction of sound-producing instruments and instruments, can solve the problems of high production cost, difficulty in designing a good sound-absorbing structure, and inability to form, and achieves low production cost, obvious economic and social benefits, and economical The effect of processing costs
Inactive Publication Date: 2009-05-27
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
In the prior art, the invention patent of "Manufacturing method of sound-absorbing board and sound-absorbing board with sandwich structure" with the application number of 96199598 is composed of a carrier board, a covering layer covering the carrier board, and an intermediate layer containing coarse pores. It is difficult to design and form an excellent sound-absorbing structure that reaches a wide frequency band; the utility model patent of "sound-absorbing and noise-reducing net device" with the application number of 99217277 consists of a protective layer with an aperture of 0.05-0.8mm, and the superimposed mesh layer is 0-1 Layer, composed of sound-absorbing layer wire mesh with a mesh thickness of 0-1 mm, and cannot form micron-sized pores
The invention patent with application number 200510023452 "Double-sided sound-absorbing meshing cavity without cotton sound barrier" mainly uses two layers of aluminum fiber sheets and two layers of micro-perforated plates. The main disadvantage is that the production cost is relatively high
The utility model patent of "perforated sound-absorbing aluminum foam" with application number 200420025074 improves the sound-absorbing performance by punching holes in the foamed aluminum, but also has the disadvantage of high production cost
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[0008] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0009] like figure 1 As shown, the present invention is composed of one or more sound-absorbing layer structural units 1 , supports 2 and backboards 3 . Wherein, the sound-absorbing layer structural unit 1 includes two layers of mesh 4 and middle layer of particles 5 . The size of the particles 5 is slightly larger than the mesh size of the net 4, the particles 5 are partly embedded in the mesh, and the average pores less than 0.05 mm are formed between the particles 5 and the mesh. An air gap 6 is left between the sound-absorbing layer structural unit 1 and the back plate 3 ; an air gap 6 may or may not be left between the sound-absorbing layer structural unit 1 . like figure 2 As shown, when there is no air gap 6 between the sound-absorbing layer structural units 1, a net 4 is shared between the two sound-absorbing layer structural ...
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The invention relates to a micro-hole sound-absorbing structure in the field of environment noise control technology. It comprises one or a plurality of sound-absorbing structure units, a supporter and a back board. The sound-absorbing structure unit comprises two layers of net and an interlayer particle; the particle size is bigger than the size of the net-hole; the particle is partly embedded in the net hole. One or a plurality of sound-absorbing structure units is fixed on the back board to form the micro-hole sound-absorbing structure. There is the air gap between the sound-absorbing structure unit and the back board.
Description
technical field [0001] The invention relates to a sound-absorbing structure, in particular to a microporous sound-absorbing structure used for air sound absorption, and belongs to the technical field of environmental noise control. Background technique [0002] At present, fiber materials are mainly used to make sound-absorbing structures, which can usually achieve high sound-absorbing performance in a relatively wide frequency range. The main disadvantage is that the anti-aging performance of fiber materials is not good, and the commonly used mineral wool and glass fibers are still harmful materials to the human body. In addition, to obtain excellent low-frequency sound absorption performance, the thickness is required to be equivalent to the sound wavelength, which often makes the size of the sound-absorbing structure large. The sound-absorbing materials that replace fibers include foamed materials, such as foamed aluminum and foamed ceramics. Since the foamed materials a...
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IPC IPC(8): G10K11/162G10K11/165
Inventor陈光冶邓真全
OwnerSHANGHAI JIAOTONG UNIV