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Silencing sheet

A technology of sound-absorbing sheets and sound-absorbing materials, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of lack of mufflers, etc., and achieve the effects of reducing flow loss, low flow resistance, and benefiting low-frequency sound absorption

Pending Publication Date: 2020-08-04
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art due to the lack of a muffler with both broadband noise reduction and low flow resistance characteristics, so as to provide a kind of broadband noise reduction and low flow resistance characteristics. Muffler

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] to combine figure 1 , figure 2 As shown, a sound absorbing sheet, comprising:

[0040] The sound-absorbing sheet housing 2, which is at least partly made of perforated plates; and

[0041] Sound-absorbing material 3, the sound-absorbing material 3 is uniformly filled inside the sound-absorbing sheet shell 2, and the sound-absorbing material is made of loose and porous materials, such as slag wool, sponge, etc., which are not limited too much in this embodiment ;

[0042] The sound-absorbing sheet shell 2 is constructed sequentially along the airflow direction S into a front edge plate 21, a middle panel 22, and a tapered panel 23, wherein the middle panel 22 and the tapered panel 23 are respectively composed of two kinds of perforated plates with different perforation rates, Specifically, the front edge panel 21 , the middle panel 22 and the tapered panel 23 are made of metal or hard plastic. At the same time, in order to realize that the sound waves enter the inte...

Embodiment 2

[0063] combine image 3 Shown, a kind of sheet type muffler, it comprises at least one as above-mentioned sound attenuation sheet, described sheet type muffler also comprises:

[0064] The outer shell of the muffler 1 is suitable for accommodating at least two sound-absorbing sheets at intervals, and an air flow channel is formed between the two sound-absorbing sheets.

[0065] As an improved implementation form, at least two of the sound-absorbing sheets are placed parallel to each other.

[0066] As a further improved implementation form, at least two of the sound-absorbing sheets are arranged parallel to each other and equidistant from each other. Combined with the specific structural form of the mufflers, the flat flow channel at the front of the muffler and the divergent flow channel at the rear are constructed by placing them in parallel at equal intervals.

[0067] The middle panel 22 is a parallel plate, which can form a flat flow channel between the two noise-absorb...

Embodiment 3

[0071] In order to prove that the noise-absorbing sheet provided by the present invention and the corresponding sheet-type muffler have a better noise-absorbing effect compared with the traditional noise-absorbing structure, a detailed description will be given below through a control experiment.

[0072] For the convenience of expression, the sound-absorbing sheet provided by the present invention is referred to as the sound-absorbing sheet hereinafter, and the sheet-type muffler provided by the present invention is referred to as the present muffler for short.

[0073] combine Figure 5 As shown, as a comparison, the muffler without tapered panels is used as the reference muffler, and the muffler corresponding to the reference muffler, which has a uniform channel front and back along the airflow direction S, and a given pressure loss is defined as the reference muffler. When designing this muffler, ensure that the thickness of the parallel part of this muffler is greater tha...

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Abstract

The invention relates to the technical field of silencing sheets, in particular to a silencing sheet which comprises a noise elimination sheet shell which is at least partially composed of a perforated plate; and a sound absorption material which is uniformly filled in the silencing sheet shell; a front edge plate, a middle face plate and a gradually-shrinking face plate are sequentially arrangedon the silencing piece shell in the airflow direction S. The middle face plate and the gradually-shrinking face plate are each composed of two kinds of perforated plates with different perforation rates. According to the silencing sheet provided by the invention, different perforation rates are adopted for the middle panel part and the tapered panel part, so that silencing can be carried out on different frequency spectrum parts of a noise source, and the optimal overall silencing amount under the same pressure loss condition is achieved.

Description

technical field [0001] The invention relates to the technical field of sound-absorbing sheets, in particular to a sound-absorbing sheet. Background technique [0002] The muffler can block and weaken the propagation of sound waves, allowing airflow to pass through, and is an effective tool for noise control. Resistive mufflers are widely used in air-conditioning and ventilation systems of civil and industrial buildings to prevent the outward radiation of operating noise from air-conditioning units, fans, cooling towers, boilers and generator sets. The sound attenuation performance of the resistive sound absorbing sheet mainly depends on factors such as the length, thickness, spacing, shape of the sound attenuating channel, the characteristics of the perforated plate, and the properties of the sound absorbing material. [0003] By reducing the distance between the plates or increasing the thickness of the sound-absorbing plates, the sound-absorbing capacity can be increased,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16G10K11/161G10K11/162
Inventor 钟振茂黄立锡赵迎九张洪军李庆建魏普汪光辉任玉凤于雅楠江腾武郭江海邱兆国
Owner HUADIAN HEAVY IND CO LTD
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