Baffled acoustic metamaterial silencer, and preparation and assembling methods thereof

An acoustic metamaterial and muffler technology, which is applied in the direction of sound-generating equipment and instruments, can solve the problems of incompetent low-frequency broadband noise conditions and narrow effective muffling bandwidth, and achieves enhanced work stability, improved muffling performance, and reduced noise volume. level effect

Active Publication Date: 2018-01-26
黄礼范
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the invention limits the surface of the acoustic metamaterial unit cell to be parallel to the noise incident direction in the pipeline, although the resistance to passing fluid is reduced to a certain extent, its effective noise reduction bandwidth is extremely narrow. The working bandwidth of the muffler is only a dozen Hz, which is difficult for low-frequency broadband noise conditions

Method used

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  • Baffled acoustic metamaterial silencer, and preparation and assembling methods thereof
  • Baffled acoustic metamaterial silencer, and preparation and assembling methods thereof
  • Baffled acoustic metamaterial silencer, and preparation and assembling methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Embodiment 1 Basic acoustic metamaterial baffle muffler

[0114] Attached below Figure 2-8 The structural parameters, preparation method, performance calculation and measurement, and mechanism analysis of the basic acoustic metamaterial baffle muffler are described.

[0115] 1. Structural parameters and preparation methods

[0116] Use SPCC cold-rolled steel plate to form one piece by laser cutting, such as figure 2 The frame of the basic PAMB (14) shown is glued with a film on one side and perforated. The basic PAMB is positioned inside the expansion chamber (12) through a sleeve, and the outer cavity of the muffler is assembled through a flange connection. Wherein, the expansion cavity (12) has a length of 250mm and an inner diameter of 46mm; the inlet pipe (11) has a length of 15mm and an inner diameter of 10mm; the outlet pipe (13) has a length of 15mm and an inner diameter of 10mm; the muffler has uniform wall thickness and a thickness of 3mm; The distance bet...

Embodiment 2

[0131] Embodiment 2 contains the muffler of two groups of acoustic metamaterial baffles

[0132] 1. Structural parameters

[0133] Such as Figure 10 As shown, the muffler containing two sets of PAMBs described in Example 2 of the present invention is formed by installing a set of PAMBs on the basis of the basic acoustic metamaterial baffle muffler described in Example 1. The structural size and material composition of the two groups of PAMBs (30) and (31) are not exactly the same, and they are respectively aimed at different frequency bands of the noise-absorbing troughs. Wherein, the frame of the first group of PAMBs (30) is circular, with an outer diameter of 46mm, an inner diameter of 40mm, and a thickness of 2mm; the outer diameter of the constrained body with holes is 18mm, and the diameter of the constrained body hole is 12mm; the perforated film The thickness is 0.05mm, and the diameter of the through hole is also 12mm; the double-arm connecting rod between the const...

Embodiment 3

[0137] Embodiment 3 Sound-absorbing material closed impedance compound muffler

[0138] 1. Structural parameters

[0139] Such as Figure 13 As shown, the sound-absorbing material closed impedance composite type muffler composed of two layers of PAMB filled with sound-absorbing material according to Embodiment 2 of the present invention includes a group of sound-absorbing material sealed impedance composite type baffles (35), which are composed of It is composed of two layers of PAMB with sound-absorbing material sandwiched between them. Wherein, the first layer of PAMB (comprising frame (37) and perforated film (36)) is connected with the second layer of PAMB (comprising frame (41) and perforated film (42)) through bracket (40), and the periphery of bracket (40) is laid An annular covering film (39), filled with sound-absorbing material (38) between the annular covering film (39) and the inner wall surface of the muffler cavity (34). Wherein, the structural size and materi...

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PUM

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Abstract

The invention relates to a silencer comprising an inlet pipe, an outlet pipe, a hollow expansion cavity formed between the inlet pipe and the outlet pipe, and a perforated acoustic metamateiral bafflearranged vertically or obliquely at the internal cross section of the hollow expansion cavity. The a perforated acoustic metamateiral baffle includes a frame; a constraint body in rigid connection with the frame is arranged inside the frame; a thin film covers the surface of the frame; and through holes are formed in the constraint body and the thin film. In addition, the invention also relates to an improved silencer; and occurrence of standing wave damping valley of the traditional resistant silencer is avoided and the good low-frequency noise elimination effect is realized. In addition, according to another embodiment, the invention also relates to an improved silencer, so that a problem of the direct contact between the sound absorption material and the fluid is solved. And accordingto another embodiment, the invention also relates to a silencer for improving the heat transfer efficiency of the fluid medium at the two sides of the hole by using vibration of a perforated acousticmetamateiral baffle. Besides, the invention also provides a method for frequency modulation and preparation of a perforated acoustic metamateiral baffle and a method of assembling the silencer. The silencer has characteristics of compact structure, simple process, stable performance, and long service life.

Description

technical field [0001] The invention relates to a muffler with a through-hole acoustic metamaterial baffle, which can customize the effective muffler frequency band, expand the low-frequency muffler bandwidth, have small fluid passing resistance, and can enhance fluid heat transfer efficiency, and belongs to the field of acoustic devices. Background technique [0002] For the noise generated by gas or liquid media passing through pipelines, such as industrial circulation pipelines, building fresh air system pipelines, intake and exhaust pipes of fluid mechanical power equipment, refrigerant transmission pipes of refrigeration appliances such as air-conditioning refrigerators, and various types of high-pressure, high-temperature and high-speed The usual solution is to install a muffler device to ensure the smooth passage of a sufficient amount of fluid and effectively reduce the passing noise level. [0003] At present, mufflers are mainly divided into three categories accord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/162
Inventor 黄礼范王术光刘新刚
Owner 黄礼范
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