Noise reduction structure of porous plate

Abstract

Provided is a small noise reduction structure capable of exhibiting full noise reduction performance over a wide frequency bandwidth. The noise reduction structure D comprises a cylindrical duct 41; a perforated panel 42 extended inside the duct 41 along the axial direction of the duct 41 and positioned to define the duct cross section of the duct 41; and partition panels 43 by which the duct 41 defined by the perforated panel 42 is axially partitioned into a plurality of cells 44. The intervals at which the partition panels 43 are installed are adjusted so that b F16L 55 / 02 F01N 1 / 02 7 13 1 2004 / 5 / 21 1573199 2005 / 2 / 2 1311186 2007 / 4 / 18 2007 / 4 / 18 2007 / 4 / 18 Kobe Steel Ltd Kabushiki Kaish Japan Utsuno Hideo Yamaguchi Zenzo Tsugihashi Kazuki Komura Kazyo Kimura Yasumasa Honke Koichi wen dapeng yang songling 72001 The Company Ltd. of the Chinese Patent Agency (Hong Kong) Zi Building 22, Yingjun Centre, No.23, Gangwan Road, Hong Kong Wanzi Japan 2003 / 5 / 23 146579 / 03

Description

technical field [0001] The present invention relates to a technology of a sound-absorbing structure in a piping line for air supply or exhaust between devices or between devices. Background technique [0002] The art of sound-absorbing construction is well known in the prior art. For example, there are techniques disclosed in Non-Patent Document 1 and Patent Document 2. In this non-patent document 1, the silencer pipe A shown in FIG. 1, the resonance silencer B shown in FIG. 2, etc. are disclosed. The silencing pipe A shown in FIG. 1 is composed of a pipe 11 having a quadrangular cross section and a porous silencing material 12 . In this sound-absorbing structure, a porous sound-absorbing material 12 (for example, glass wool or metal fiber) is arranged with a certain thickness along the inner wall of the pipe 11 in the pipe 11 , and sound energy is dissipated by the porous sound-absorbing material 12 . The resonance silencer B shown in FIG. 2 is composed of a piping line ...

AI Technical Summary

Problems solved by technology

[0006] However, in the structure of the silencing pipe A of the above-mentioned Non-Patent Document 1, there is a problem that the porous silencing material itself changes or deteriorates over time due to flow velocity changes, temperature changes, dew condensation, etc. down, and into devices such as compressors, turbines, pumps, etc., thereby significantly degrading the performance of these devices or causing them to fail

In addition, when disposing of the sound-absorbing pipe, since porous sound-absorbing materials such as glass wool become industrial waste, costs for separation and disposal are incurred

In addition, in the structure of the resonance silencer B of the above-mentioned non-patent document 1, there is the following problem: since only the noise of a specified frequency can be eliminated, in order to obtain the noise reduction effect in a relatively large frequency range, it is necessary to connect and adjust multiple components of different frequencies. A resonance muffler, in addition, it is necessary to set up an amplification chamber surrounding the small hole of the piping line outside the piping line, and the overall volume is relatively large

Furthermore, in the configuration of the porous soundproof structure C of the above-mentioned Patent Document 2, there is a problem that generally, the smaller the opening, the higher the sound attenuation performance. , oil droplets, and liquid droplets are more likely to clog the opening, which reduces the sound attenuation performance

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