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Sound absorbing device

A sound-absorbing device and sound technology, applied in the field of sound-absorbing devices, can solve problems such as effect reduction, noise deterioration, and noise reduction

Inactive Publication Date: 2022-03-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the structure described in the above-mentioned Patent Document 1 has the possibility of reducing the noise reduction effect or deteriorating the noise.

Method used

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Experimental program
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Effect test

no. 1 approach

[0065] A first embodiment will be described with reference to the drawings. The sound absorbing device of the present embodiment is installed in, for example, a vehicle air conditioner or a blower duct, and absorbs sound propagating in the air.

[0066] Such as Figure 1 ~ Figure 3 As shown, the sound absorbing device includes a passage member 10, a fine perforated plate 20, and the like. The passage member 10 is formed, for example, in a rectangular cross-section, and has a passage for air to flow inside. In addition, the cross-sectional shape of the passage member 10 is not limited to a rectangular shape, and various shapes such as a circle, an ellipse, a polygon, or a combination thereof may be employed.

[0067] exist figure 1 and image 3 In , the main flow direction of the air flowing in the passage of the passage member 10 is indicated by a hollow arrow. In addition, in the present embodiment, the main flow direction of the air flowing in the passage of the passage...

no. 2 approach

[0097] A second embodiment will be described. Compared with the first embodiment, the arrangement of the plurality of through-holes 21 penetrating through the micro-perforated plate 20 is changed in the second embodiment. Others are the same as the first embodiment, so only the differences from the first embodiment will be described.

[0098] Such as Figure 10 As shown, in the second embodiment, the plurality of through-holes 21 penetrating the fine perforated plate 20 are randomly arranged. In other words, the plurality of through holes 21 are randomly arranged without any regularity. exist Figure 10 In , an imaginary line including the center of the predetermined through-hole 21 and parallel to the centerline CL of the passage is indicated by a dashed-dotted line L1. In addition, an imaginary line including the center of the designated through-hole 21 and perpendicular to the centerline CL of the passage is indicated by a dashed-dotted line L2. Viewed from these two im...

no. 3 approach

[0102] A third embodiment will be described. Compared with the first embodiment and the like, the third embodiment has the thickness of the air layer 12 changed, and the others are the same as the first embodiment and the like, so only the parts different from the first embodiment and the like will be described.

[0103] Such as Figure 11 As shown, in the third embodiment, the inner wall surface 13 of the passage member 10 has a shape curved from the upstream side toward the downstream side. Therefore, the distance H between the inner wall surface 13 of the passage member 10 and the fine perforated plate 20 changes from the upstream side to the downstream side. Therefore, among the plurality of through holes 21 , the distance H between the inner wall surface 13 of the passage member 10 and the through holes 21 is different at least between adjacent through holes 21 . That is, between adjacent through holes 21 , the thickness of the air layer 12 between the inner wall surfac...

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Abstract

The passage member (10) has a passage through which air flows. The fine perforated plate (20) is a plate-shaped member having a plurality of fine through-holes (21) penetrating therethrough, is provided such that one surface faces the flow field (11) of the air in the passage and the other surface faces the inner wall surface (13) of the passage member with an air layer (12) therebetween, and generates a viscous damping effect by means of the air passing through the through-holes (21). Furthermore, among the plurality of through-holes (21), at least adjacent through-holes (21) are not disposed in a straight line in a direction orthogonal to the center line (CL) of the passage, but are disposed at positions shifted from the direction orthogonal to the center line (CL) of the passage.

Description

[0001] Cross-references to related applications [0002] This application is based on Japanese Patent Application No. 2019-134790 filed on July 22, 2019, the contents of which are described herein as a reference. technical field [0003] The invention relates to a sound absorbing device for absorbing sound propagating in a fluid. Background technique [0004] Conventionally, there is known a technique for obtaining a sound-absorbing effect by providing a perforated plate through an air layer in front of a rigid wall. Patent Document 1 discloses a structure in which sound propagating in the pipe is absorbed by providing a perforated plate on the inner wall of a cylindrical pipe with an air layer interposed therebetween. [0005] prior art literature [0006] patent documents [0007] Patent Document 1: Japanese Unexamined Patent Publication No. 2005-9483 [0008] However, the inventors have intensively studied a structure in which a fine perforated plate is provided on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/033
CPCF16L55/033G10K11/16B60H1/00
Inventor 秋松龙之介冨堂绫香佐藤广之井手辰次
Owner DENSO CORP
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