Wide-frequency-band airflow noise muffling device

By designing a wideband airflow noise silencing device, and utilizing a combination of tapered and expanded pipes, sound-absorbing layers, and resonant cavities, the problem of poor noise control in the wideband of traditional silencing devices is solved. This achieves effective suppression of mid-to-high frequency and low-frequency noise, improves environmental comfort, and simplifies the maintenance process.

CN224137895UActive Publication Date: 2026-04-17SHANGHAI ENVIRONMENTAL PROTECTION CO LTD
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Patent Information

Application Number
CN202520821398.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-27
Publication Date
2026-04-17
Estimated Expiration
2035-04-27

AI Technical Summary

Technical Problem

Traditional noise-absorbing louvers have limited effectiveness in controlling noise over a wide frequency range, making it difficult to meet increasingly stringent environmental and usage requirements. Furthermore, they are complex in structure and difficult to maintain.

Method used

A wideband airflow noise silencing device was designed, including an air inlet, a diffusion section, a silencing section, a flow guiding section, and an air outlet. It is equipped with a sound-absorbing layer and a resonant sleeve inside, and adopts a tapered and expanded pipe structure and resonant cavities of different sizes. The sound-absorbing layer absorbs mid-to-high frequency noise, and the resonant cavity absorbs low-frequency noise.

Benefits of technology

It achieves effective coverage of wide-band noise, significantly suppresses mid-to-high frequency and low-frequency noise, improves environmental comfort, and has a simple structure that is easy to manufacture and maintain.

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Abstract

The utility model discloses a wide-frequency-band airflow noise muffling device which comprises an air inlet end. The air inlet end is connected with a diffusion section, the diffusion section is connected with a muffling section, the muffling section is connected with a flow guide section, and the flow guide section is connected with an air outlet end. Sound absorption layers are installed on the two sides of the interior of the silencing section, the sound absorption layers are arranged at the output end of the diffusion section, a resonance sleeve is arranged on the side, close to the flow guide section, of the silencing section, and a plurality of resonance cavities are formed in the resonance sleeve. According to the utility model, effective coverage and reduction of wide-frequency-band noise are realized, medium-high-frequency airflow noise in a ventilation system and low-frequency noise in exhaust of an engine can be remarkably suppressed, strict requirements of different occasions on noise control are met, the overall structural design is simple and clear, and the cost is low. The functions of all the components are clear and easy to achieve, the simple structure is convenient to machine and assemble in the manufacturing process, and the operation difficulty and cost can be reduced in the later maintenance and overhaul process.
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