A multi-fiber blended sound-absorbing material

A sound-absorbing material and multi-fiber technology, used in sound-emitting equipment, textiles, papermaking, non-woven fabrics, etc. The preparation process is simple and the effect of aging is not easy

Active Publication Date: 2018-08-14
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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  • A multi-fiber blended sound-absorbing material
  • A multi-fiber blended sound-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A multi-fiber blended sound-absorbing material, which is composed of aluminum fibers and organic composite polymer fibers, is characterized in that the material of the aluminum fibers is pure aluminum with a diameter of 100 μm, and the material of the organic composite polymer fibers is polyester fibers (inside) And polypropylene fiber (outer layer), the diameter is 50μm, the mixing ratio is (mass of aluminum fiber: quality of organic composite polymer fiber) 1:2, and the surface density of fiber mat is 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 fiber filaments of uniform thickness;

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

Embodiment 2

[0039] The multi-fiber blended sound-absorbing material is prepared in the same manner as in Example 1, but the difference is that the diameter of the aluminum fiber is 50 μm, the diameter of the organic composite polymer fiber is 20 μm, and the mixing ratio is (quality of aluminum fiber: organic composite high Molecular fiber mass) 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 for the above-mentioned equipment, this product gives up the absorption rate of part of the mid-to-high frequency band noise, and the sound absorption coefficient drops significantly from 300Hz.

Embodiment 3

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

[0043] Embodiment 3 is mainly aimed at intermediate frequency equipment such as fans with a noise frequency between 800 and 2000 Hz. The results show that the sound absorption coefficient of embodiment 3 is always 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 Tube Part 1: Transfer Function Method", the examples 1 to 3 measured by the Danish B&K4206 dual-microphone impedance measurement system The sound absorption coefficient of the multi-fiber blended sound-absorbin...

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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-absorbing and noise-reducing material, in particular to a multi-fiber blended sound-absorbing material for substation low-frequency noise. Background technique [0002] With the advancement of urbanization, increasingly stringent 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 substations and creating a quiet and warm living environment for surrounding residents has become a priority task for 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 during operation. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/541G10K11/162
Inventor 樊超聂京凯田一王广克金文德章姝俊潘巍巍李睿卢林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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