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Multi-fiber blended sound-absorbing material

A sound-absorbing material, multi-fiber technology, applied in the directions of sound-producing equipment, textiles and papermaking, non-woven fabrics, etc., can solve the problems of dust pollution, lack of strength, high cost, etc., and achieves simple preparation process, not easy to deform, and environmental protection. good effect

Active Publication Date: 2015-06-10
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of material not only has good sound absorption performance, but also has the characteristics of light weight, non-combustibility, non-corrosion, non-aging, and low price, which replaces natural fiber sound-absorbing materials and has been widely used in acoustic engineering. The main disadvantage of this type of material is that the low-frequency sound absorption performance is poor, and its dust pollutes the environment.
For example, rock wool / glass wool sound-absorbing materials have no strength and are easy to be damp. After being damp, they basically do not absorb sound, and are easy to age and pollute the environment. It will seriously pollute the environment in ten years
However, the use of all-metal fiber is not conducive to large-scale promotion due to its high rigidity and high cost, especially in the vibration service environment, it is easy to become a vibration transmission path

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A multi-fiber blended sound-absorbing material is composed of aluminum fibers and organic composite polymer fibers, characterized in that the aluminum fibers are made of pure aluminum, with a diameter of 100 μm, and the organic composite polymer fibers are made of polyester fibers (inside) And polypropylene fiber (outer layer), the diameter is 50μm, the mixing ratio is (aluminum fiber quality: organic composite polymer fiber quality) 1:2, fiber mat surface density 1000g / m 2 , the thickness of the fiber mat is 3cm, and the thickness of the air layer in the back cavity is 15cm when used.

[0031] The preparation method of the multi-fiber blended sound-absorbing material comprises the following steps:

[0032] (1) Use high-quality pure aluminum raw materials to scrape into aluminum fibers with the same thickness;

[0033] (2) The aluminum fiber filaments are cut into aluminum fiber short fibers of the same length through a fiber cutter

[0034] (3) The organic composite ...

Embodiment 2

[0039] The multi-fiber blended sound-absorbing material was prepared in the same way as in Example 1, but the difference was that the diameter of the aluminum fiber was 50 μm, the diameter of the organic composite polymer fiber was 20 μm, and the mixing ratio was (aluminum fiber quality: organic composite high Molecular fiber quality) 2:1, fiber mat surface density 1500g / m 2 .

[0040] This embodiment is mainly designed for low-frequency equipment such as high-voltage reactors and main transformers. However, in order to meet the needs of low-frequency noise reduction of the above equipment, this product abandons the absorption rate of some medium and high frequency noise, and the sound absorption coefficient decreases significantly from 300Hz.

Embodiment 3

[0042] The multi-fiber blended sound-absorbing material was prepared by the same method as in Example 1, but the difference was that the diameter of the aluminum fiber was 50 μm, the diameter of the organic composite polymer fiber was 50 μm, and the mixing ratio was (aluminum fiber quality: organic composite high Molecular fiber quality) 2:1, fiber mat surface density 1200g / m 2 .

[0043] Example 3 is mainly aimed at intermediate frequency equipment with noise frequencies between 800 and 2000 Hz, such as fans. The results show that the sound absorption coefficient of Example 3 is always maintained above 0.7 between 600 and 1600 Hz.

[0044] According to the national standard GB / T18696.2-2002 "Measurement of Sound Absorption Coefficient and Acoustic Impedance in Acoustic Impedance Tubes - Part 1: Transfer Function Method", using the Danish B&K4206 dual-microphone impedance measurement system measured in Examples 1 to 3 The sound absorption coefficient of the multifiber blend s...

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Abstract

The invention relates to a multi-fiber blended sound-absorbing material comprising aluminum fibers and organic composite polymer fibers. The multi-fiber blended sound-absorbing material is characterized in that the aluminum fibers 50-100 micrometers in diameter are made of pure aluminum; the organic composite polymer fibers 20-50 micrometers in diameter include polyester fibers (on the inner layer) and polypropylene fibers (on the outer layer). A blend fiber design thought is adopted, the aluminum fibers and the organic composite polymer fibers are blended, the polypropylene fibers melt during bake forming according to a low melting point, the aluminum fibers are adhered to the polyester fibers, and the multi-fiber blended sound-absorbing material with damping energy dissipation property is produced.

Description

technical field [0001] The invention relates to a sound absorption and noise reduction material, in particular to a multi-fiber blended sound absorption material for low-frequency noise of a substation. Background technique [0002] With the advancement of urbanization, the increasingly strict laws and regulations, and the enhancement of residents' awareness of environmental protection, the noise problem of substations has become one of the shackles restricting the development of power transmission and transformation. Properly solving the noise problem of the substation and creating a quiet and warm living environment for the surrounding residents has become the priority task of the power grid operation department. [0003] The main transformer (main transformer) is the core noise source of the substation, and its noise level directly determines the noise level of the substation. The noise of the main transformer is mainly caused by the magnetostriction of the iron core dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/541G10K11/162
Inventor 樊超聂京凯田一王广克陈新韩钰朱全军陈云马光祝志祥杨富尧李靖孔晓峰何明锋王斌徐国忠卢纯义
Owner STATE GRID CORP OF CHINA
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