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Microporous-fiber composite sound absorbing board

A fiber composite, sound-absorbing board technology, applied in the direction of sound-generating equipment, instruments, etc., can solve the problem of not satisfying low-frequency sound absorption and so on

Active Publication Date: 2012-12-26
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Application No. 201010191493.3, an invention patent named "A Microporous Fiber Perforated Plate and Its Preparation Method", its technical solution provides a microporous fiber perforated plate and its preparation method, and the examples obtained The effect is at 125Hz, and the sound absorption coefficient is below 0.1, which cannot meet the requirements of low-frequency sound absorption

Method used

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  • Microporous-fiber composite sound absorbing board
  • Microporous-fiber composite sound absorbing board
  • Microporous-fiber composite sound absorbing board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1: Acoustic board 1#

[0065] Micro-perforated plate 1: Use commercially available 0.5mm aluminum plate to prepare micro-perforated plate 1, in which the hole spacing is 2mm and the aperture is 1.5mm;

[0066] Manufacturer Name: Zhongzhou Aluminum Co., Ltd.

[0067] Manufacturer Address: Kotou Industrial Zone, Xiaoguan Town, Gongyi City, Henan Province

[0068] Aluminum plate model: 1050 series aluminum plate

Embodiment 2

[0069] The aluminum plates in Example 2, Example 3 and Example 4 were all purchased from the aforementioned manufacturers.

[0070] Aluminum fiberboard 2: customized areal density is 300g / m 2 Aluminum fiber board 2, in which the aluminum fiber is prepared by melt extraction method, and the fiber diameter is 120 μm;

[0071] Combination: Combine the micro-perforated board 1 and the aluminum fiber board 2, and connect them through the keel 3. The distance between the micro-perforated board and the aluminum fiber board is 20mm, and the distance between the aluminum fiber board 2 and the wall is 180mm; the sound-absorbing board is made 1#;

[0072] The sound absorption coefficient curve (red line) of sound absorption board 1# see image 3 , image 3 The sound absorption coefficient curve of the aluminum fiber sound-absorbing board (AL-fibre board) used as a comparative experiment in the test is represented by black lines. The distance between the aluminum fiber sound-absorbing board and...

Embodiment 3

[0078] Example 3: Acoustic board 3#

[0079] Micro-perforated plate 1: A commercially available 0.8mm aluminum plate is used to prepare the micro-perforated plate, the hole spacing is 15mm, and the aperture is 0.8mm;

[0080] Aluminum fiberboard 2: customized areal density is 500g / m 2 Aluminum fiber board, in which aluminum fiber is prepared by melt extraction method, and the fiber diameter is 90 μm;

[0081] Combination: Combine the micro-perforated board 1 and the aluminum fiber board 2, and connect them through the keel 3. The distance between the first resonance cavity 7 between the micro-perforated board 1 and the aluminum fiber board 2 is 60mm, and the second between the aluminum fiber board 2 and the wall The distance of the resonance cavity 8 is 120mm; it is made of sound-absorbing board 3#;

[0082] The sound absorption coefficient curve of sound-absorbing board 3# (red line) see Figure 5 , Figure 5 The sound absorption coefficient curve of the aluminum fiber sound-absorbin...

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Abstract

The invention provides a microporous-fiber composite sound absorbing board, belonging to the field of instruments for absorbing noises through adopting the resonance principle. The sound absorbing board has a good low-frequency sound absorbing effect, and the sound absorbing coefficient of the sound absorbing board is larger than 0.5 at 125Hz. Compared with an aluminum fiber absorbing board, the sound absorbing board has a wider absorbing absorption band. The sound absorbing coefficient of the sound absorbing board is not smaller than 0.4 at 250-1600Hz. The composite sound absorbing board is formed by compounding a micro-perforated board with an aluminum fiber board and adopts a double-resonance coupling structure. The micro-perforated board is connected with the aluminum fiber board through a keel frame to form a first resonating cavity, and the aluminum fiber board is connected with a wall through the keel frame to form a second resonating cavity. The micro-perforated board and the aluminum fiber board are coupled through a resonance peak to achieve the purposes of increasing the low-frequency sound absorbing effect and expanding the absorbing absorption band. The composite sound absorbing board adopting an all aluminum structure has the characteristic of good recycling, and the problems of aging, dropping and the like do not exist. The sound absorbing board also has the characteristic of good heat conduction, and is convenient for equipment to dissipate heat.

Description

Technical field [0001] The invention belongs to the field of instruments that use the principle of resonance to absorb noise, and specifically relates to a microporous fiber composite sound-absorbing panel. Background technique [0002] With the development of urbanization and the increase of residents' awareness of environmental protection, the problem of substation noise has gradually become a problem that the power grid operation department needs to face squarely. At present, whether it is an urban substation or a rural substation, with the increasing shortage of land resources, the building and population density around the substation has gradually increased. This objectively causes the substation noise to become a hot spot for some urban residents to complain to the environmental protection department. The resulting petitions and mass incidents have increased dramatically. In the "Environmental Macro Strategy of the State Council" that has been issued, power industry substa...

Claims

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Application Information

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IPC IPC(8): G10K11/172
Inventor 聂京凯陈新韩钰杨富尧祝志祥马光朱全军李现兵
Owner CHINA ELECTRIC POWER RES INST
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