Diffusion muffling device, diffusion resonance muffling device, full-frequency diffusion muffling device, muffling system for ventilation channel, and muffling method using the same
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Solution Overview
Problem
Existing ventilation mufflers, particularly dissipative types, exhibit poor low-frequency sound muffling performance due to limitations in fibrous porous sound absorbing materials, and inadequate noise reduction at medium and high frequencies.
Innovation Solution
A diffusion muffling device and system featuring diffusion and diffusion resonance structures with convex portions arranged in a ventilation channel, allowing sound waves to be diffused and reflected multiple times, and optionally combined with porous sound absorbing materials for full-frequency muffling, eliminating the need for fiberized materials and enhancing low-frequency sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fibrous porous sound absorbing materials are used in mufflers, then medium frequency noise reduction is effective, but production cost and environmental impact increase
Solution Approach 1:
The patent replaces expensive and environmentally problematic fibrous porous materials with simple geometric structures made from conventional, inexpensive materials. The diffusion-based approach uses basic manufacturing processes to create convex portions and cavities, eliminating the need for specialized sound-absorbing materials while maintaining effective noise reduction performance
Solution Approach 2:
The patent extracts and removes the fibrous porous sound absorbing materials from the muffler design, retaining only the essential acoustic function through geometric diffusion structures. This extraction eliminates the environmental and cost issues associated with fibrous materials while preserving the core noise reduction capability through optimized surface geometry
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively improves low-frequency sound muffling performance and achieves broader frequency band noise reduction in ventilation channels, reducing production costs and environmental impact while maintaining effective noise reduction across frequencies.
Implementation Method 1
sound waves entering the muffling passage are reflected for multiple times in the muffling passage by the plurality of convex portions and then sound is attenuated
Implementation Method 2
sound is attenuated
Implementation Method 3
acoustic energy is converted by friction into heat energy and dissipated
Implementation Method 4
acoustic energy is converted by friction into heat energy and dissipated when sound waves are transmitted through a sound absorbing material or structure
Data Source
AI summary
Embodiments of the present disclosure provide a diffusion muffling device, a diffusion resonance muffling device, a full-frequency diffusion muffling device, a muffling system for a ventilation channel, and a muffling method using the same, which include a plurality of diffusion muffling units disposed in the ventilation extension direction of the ventilation channel, wherein the plurality of diffusion muffling units are arranged in parallel in a direction with a predetermined angle between the direction and the ventilation extension direction of the ventilation channel, and a muffling passage is formed between each two adjacent diffusion muffling units, wherein each of the diffusion muffling units includes at least one diffuser, and each diffuser includes a plurality of convex portions so that sound waves entering the muffling passage are reflected multiple times in the muffling passage by the plurality of convex portions and then sound is attenuated. In the present disclosure, the diffusers are disposed to diffuse and reflect sound waves, so that the sound is attenuated in a long and narrow passage by multiple times of reflections of the sound waves, thereby improving the low-frequency sound muffling performance in the ventilation channel so as to effectively achieve an effect of sound muffling and noise reduction in ventilation.