A Broadband Low Frequency Acoustic Muffler

Abstract

The invention discloses a broadband low-frequency acoustic muffler, which comprises a ventilation pipe, and several groups of noise-absorbing structures arranged at equal intervals are distributed around the pipe along the direction of sound wave propagation, and one group of noise-absorbing structures includes four noise-absorbing structures symmetrical to the ventilation pipe. Unit, a single structural unit is composed of at least two shells with open rectangular rings in cross section. The ring openings of adjacent shells are in opposite directions and coplanar, and the two ends of the shells are sealed by end plates. The present invention has no special requirements on the production materials, as long as it can be regarded as an acoustically rigid material in the air, it is easy to produce, very convenient in practical popularization and application, and has no pollution to the environment. The broadband low-frequency acoustic muffler of the present invention can effectively suppress noise in a wide low-frequency range, and can reduce the overall volume and compact structure. It is suitable for noise reduction of existing small-scale integrated equipment, and at the same time It can realize good ventilation performance and has strong practicability.

Description

technical field [0001] The invention relates to a broadband low-frequency acoustic muffler, which belongs to the field of acoustics. Background technique [0002] Most of the traditional mufflers suppress noise by adding porous fiber materials to the structure, but the noise reduction effect is poor in the low frequency range, and the pores of porous materials are easy to accumulate dust and bacteria, which will affect the environment and human health. In recent years, with the rapid development of acoustic metamaterials, their acoustic properties different from those of natural materials have attracted extensive attention, and many mufflers with subwavelength dimensions have been proposed and used for low-frequency noise control. However, with the rapid development of information technology, equipment tends to be small and integrated, and there are conflicts between noise control and ventilation inside the equipment. The existing noise reduction structure has gradually fail...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a broadband low-frequency acoustic muffler, which can effectively suppress the low-frequency noise of the equipment, and at the same time achieve good ventilation performance, and has a compact structure and conforms to the existing Equipment noise control needs

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