Sound muffler device for residential ductwork system
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Solution Overview
Problem
Existing HVAC ductwork systems generate significant noise that disrupts comfort and well-being, with existing sound reduction solutions being costly, complex, and difficult to install without specialized expertise.
Innovation Solution
A removably insertable sound muffler device with a baffle housing and sound-absorbing materials that can be easily installed into ductwork vents to reduce sound transmission, featuring a labyrinth channel and baffles covered with acoustic foam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional cylindrical silencers or resonators are installed permanently in the ductwork, then sound transmission is reduced, but installation requires removing and reinstalling drywall, making it complex and costly
Solution Approach 1:
The sound reduction system is segmented into modular components: a removable insert that fits within the register and separate baffle elements that can be independently positioned. This allows installation without drywall modification - the register is simply removed, the insert is placed, and the register is reattached, resolving the contradiction between sound reduction effectiveness and installation complexity
Solution Approach 2:
The sound reduction device is extracted from the traditional permanent ductwork installation approach and reimagined as a removable insert that fits within the register. This extraction allows the sound reduction function to be achieved without cutting drywall or permanently modifying the building structure, eliminating the installation complexity while maintaining sound reduction benefits
2Object-affected harmful factors
If homemade plywood solutions are permanently installed to reduce sound, then some sound reduction is achieved, but they are not very effective and costly
Solution Approach 1:
The device uses composite construction combining rigid housing material with flexible acoustic absorption materials (acoustic foam or fiberglass insulation). This composite approach provides superior sound reduction effectiveness compared to simple plywood solutions, while the modular design maintains cost-effectiveness and ease of installation
Solution Approach 2:
Acoustic foam or fiberglass insulation materials with porous structures are used to absorb sound waves effectively. These porous materials trap and dissipate sound energy, providing reliable sound reduction that surpasses solid non-porous materials like plywood, directly addressing the effectiveness reliability issue
3Object-affected harmful factors
If ductwork is relocated or isolated from occupied spaces, then sound is mitigated, but it becomes a costly affair for users to adapt to
Solution Approach 1:
The removable sound reduction insert acts as an intermediary device placed within the existing register to mitigate sound transmission. This intermediary solution allows sound control without requiring costly ductwork relocation or isolation modifications, providing an affordable adaptation path while maintaining effective sound reduction
4Object-affected harmful factors
If existing ductwork is replaced with new ductwork with built-in vibration isolation mechanisms, then sound is reduced, but it proves to be costly
Solution Approach 1:
The device incorporates adjustable and removable components that allow dynamic adaptation to different installation scenarios. The removable insert design enables users to install sound reduction without costly permanent modifications, providing flexibility that eliminates the need for expensive ductwork replacement while achieving sound reduction goals
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
Effectively reduces sound levels entering and leaving ductwork without requiring special tools or drywall cutting, enhancing comfort and productivity while allowing easy access for maintenance.
Implementation Method 1
The inner surfaces of each of the top housing wall, the bottom housing wall, the front housing wall, the first rear housing wall, the second rear housing wall, and the pair of lateral sides are covered with sound-absorbing material
Data Source
AI summary
Provided is a sound muffler device and method for reducing sound transmission from a ductwork system. The sound muffler device acts as an insert insertable into a register vent of the ductwork system to reduce the sound transmitted out from the ductwork system. The sound muffler device includes a baffle housing having an inlet section, an outlet section, and baffle housing walls. The inner surfaces of each of the baffle housing walls are covered with sound-absorbing material. The sound muffler device further includes baffle plates configured within the baffle housing. The baffle plates are also covered with sound-absorbing material on either one side or both sides. The sound muffler device further includes a labyrinth channel through which the sound waves pass along with the flowing air. The sound absorbing material within the housing and around the baffle plates absorb the sound waves to lower the level of sound.