Silencer for an air-conditioning and/or ventilation system
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Solution Overview
Problem
Air-conditioning and ventilation systems generate noise due to air flow and noise transmission between rooms, necessitating improved silencers to reduce noise emissions.
Innovation Solution
A silencer with two regions of differing sound-proofing properties, where the first region near the sound source absorbs and prevents sound propagation, and the second region allows controlled sound propagation into the environment, maintaining air flow and minimizing disruptive noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a silencer with uniform high sound-proofing is used throughout, then noise transmission to adjacent rooms is reduced, but the installation room experiences increased acoustic load
Solution Approach 1:
The silencer is divided into two portions with different sound-proofing properties: a first portion with high sound-proofing to prevent noise transmission to adjacent rooms, and a second portion with lower sound-proofing to allow controlled sound propagation into the installation room environment, thereby distributing sound locally rather than uniformly blocking it throughout
2Object-affected harmful factors
If a silencer with high sound-proofing properties is used, then noise emissions are reduced, but the structural length increases
Solution Approach 1:
Different portions of the silencer have different sound-proofing properties tailored to their specific functions: the first portion has high sound-proofing for noise isolation, while the second portion has lower sound-proofing for sound distribution, allowing the silencer to achieve high overall noise reduction without requiring excessive length
Solution Approach 2:
The silencer is segmented into distinct portions with different acoustic properties, enabling each segment to perform its specific function efficiently and reducing the total structural length required compared to a uniform high sound-proofing design
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 silencer effectively reduces noise transmission to adjacent rooms while optimizing air flow, ensuring minimal noise increase in the installation room and reducing overall acoustic load.
Implementation Method 1
The first sound-absorbing cover surrounds the central air channel in a first portion of the silencer... the first sound-absorbing cover surrounds the central air channel and the second sound-absorbing cover surrounds the central air channel
Implementation Method 2
The first outer shell surrounds the first sound-absorbing cover... The first outer shell is sound-proofing
Data Source
AI summary
A silencer for an air-conditioning and/or ventilation system has an inlet, an outlet, a central air channel which is arranged therebetween, a first sound-absorbing cover and a first sound-proofing outer shell. The first sound-absorbing cover surrounds the central air channel in a first portion of the silencer and the first outer shell surrounds the first sound-absorbing cover. A second outer shell surrounds the central air channel in a second portion of the silencer, wherein the second portion is arranged downstream of the first portion in the flow direction or the first portion is arranged downstream of the second portion in the flow direction. The second outer shell has lower sound-proofing than the first outer shell. The silencer can be configured in a compact manner and it enables propagation of the sound into an environment in which the sound does not have a disruptive effect.