Sound damping device for a ventilation system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sound attenuation methods in ventilation systems are inefficient in uniformly reducing noise across long air ducts and between rooms, often relying on random absorption and frontal sound attenuation, which can lead to incomplete noise reduction.
Innovation Solution
A sound attenuation device featuring sound-damping backdrops arranged in the flow direction within an air guiding element, with a metal jacket and sound-absorbing material, capturing and reflecting sound frequency packets into inflow and outflow devices for enhanced absorption, minimizing changes in air volume and preventing noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing material is placed on the walls of air ducts, then some noise is absorbed, but the absorption is random and incomplete because air flows along the walls
Solution Approach 1:
Instead of placing sound-absorbing material on the walls where air flows parallel to it (conventional approach), the patent inverts the arrangement by positioning the sound-damping baffle perpendicular to the air flow direction. The baffle extends across the entire cross-section of the air duct, forcing air to flow through it rather than along it, thereby achieving complete and reliable noise reduction.
Solution Approach 2:
The sound-damping baffle is constructed with porous sound-absorbing material that allows air to pass through while absorbing sound energy. This porous structure enables the baffle to effectively dampen noise by converting sound energy into thermal energy through friction within the porous matrix, while maintaining adequate airflow.
2Object-affected harmful factors
If a baffle is placed perpendicular to air flow, then noise is reduced, but air flow is obstructed
Solution Approach 1:
The sound-damping baffle utilizes porous material structure that permits air penetration while providing sound absorption. The porosity allows air molecules to pass through the baffle, minimizing flow obstruction, while the intricate pore structure creates friction that dissipates sound energy effectively.
Solution Approach 2:
The baffle combines different materials with complementary properties: a rigid framework structure provides structural integrity and positioning, while porous sound-absorbing material (such as acoustic foam or mineral wool) fills the framework to provide noise damping. This composite construction balances airflow requirements with sound reduction effectiveness.
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 reduces noise transmission by capturing and absorbing sound frequency packets, providing universal and efficient sound insulation across ventilation systems, particularly for large air quantities, and preventing whistling noises through strategic panel design and material reinforcement.
Implementation Method 1
The special feature of the invention lies in the special arrangement of the sound-damping baffle within the air guide element. The sound-damping baffle is arranged in the direction of the air flow... The sound to be reduced is not repeatedly guided to a frontally arranged sound attenuation in the form of a labyrinth as in the prior art, but rather the sound can be reduced in sufficient time according to the invention, since the elongated course of the sound attenuation baffle allows the sound to 'run to death'.
Implementation Method 2
The airflow itself is a relatively even flowing stream that behaves like a fluid... A sound, noise, or the like is generally understood to be a mechanical vibration in an elastic medium. This vibration causes pressure and density fluctuations that propagate through the medium, thus forming sound waves. The term 'noise' is used as a collective term for all auditory sensations that cannot be described as sound, tone, mixture of tones, harmony, or blend of sounds.
Implementation Method 3
A sound attenuation device featuring sound-damping backdrops arranged in the flow direction within an air guiding element, with a metal jacket and sound-absorbing material, capturing and reflecting sound frequency packets into inflow and outflow devices for enhanced absorption
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a sound attenuation device for a ventilation system, wherein an air guide element (1) with an interior space (2), an inner surface and an outer surface (3) is provided, wherein an airflow is forced in the interior space (2), wherein the air guide element (1) has a first opening (4) and a second opening (5) at each end, wherein a sound attenuation baffle (6) is arranged in the interior space (2), wherein the sound attenuation baffle (6) is arranged in a flow direction (7) of the airflow, and wherein the sound attenuation baffle (6) extends from the first opening (4) to the second opening (5).