Fan Outlet Noise Reduction Device with Dual Chambers
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Solution Overview
Problem
Existing noise reduction solutions for fan systems in heat exchange systems are inadequate in design, construction, noise reduction effectiveness, ease of installation, and maintenance costs, and fail to provide targeted noise reduction for broadband and discrete noises.
Innovation Solution
A noise reduction device comprising a connecting portion with a cylindrical shape, featuring a first chamber filled with sound-absorbing material and a second resonant noise-reduction cavity, integrated with an air duct cover, which can be easily installed on existing fans to reduce broadband and discrete noises without altering the fan's outlet height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional noise reduction solutions are used for fan systems, then some noise reduction effect is achieved, but the overall design and construction are complex and installation is difficult
Solution Approach 1:
The noise reduction device is divided into multiple functional chambers: a first chamber filled with sound-absorbing material for broadband noise reduction, and a second chamber configured as a resonant noise-reduction cavity for discrete frequency noise reduction. This segmentation allows each chamber to target specific noise characteristics independently, achieving comprehensive noise reduction while maintaining a relatively simple overall structure that can be integrated with the air duct cover.
2Object-affected harmful factors
If existing noise reduction systems are installed, then noise reduction is achieved, but installation and maintenance costs are high
Solution Approach 1:
The noise reduction device is merged with the air duct cover structure, where the connecting portion is integrally formed with the air duct cover. This integration eliminates the need for separate installation of noise reduction components and simplifies maintenance, as the noise reduction function is built into the existing air duct structure rather than being an add-on component.
Solution Approach 2:
The air duct cover serves dual functions: it maintains the structural integrity of the air duct system and simultaneously houses the noise reduction chambers. The connecting portion with its top, side, and bottom portions forms a cylindrical structure that both directs airflow and contains the noise reduction mechanisms, reducing the need for additional components and lowering manufacturing and installation costs.
3Object-affected harmful factors
If traditional noise reduction methods are applied, then general noise reduction is achieved, but targeted noise reduction for specific frequencies is not effective
Solution Approach 1:
Different chambers are designed with locally optimized characteristics: the first chamber uses sound-absorbing material distributed throughout to target broadband noise across a wide frequency range, while the second chamber is specifically configured as a resonant cavity with particular dimensions and opening characteristics to target discrete frequency noises. This local quality differentiation enables the system to address multiple noise types simultaneously with high 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 fan noise by up to 1.3-2.4 dBA, improving the on-site environment with a simple and cost-effective installation process that maintains the original fan height and allows for targeted noise reduction of both broadband and discrete frequencies.
Implementation Method 1
the first chamber being located in the accommodation space and filled with a sound-absorbing material
Implementation Method 2
the second chamber being located in the accommodation space and configured as a resonant noise-reduction cavity
Data Source
Figure 1~2
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AI summary
A noise reduction device (1) for an outlet side of a fan (20), and a heat exchange system including the noise reduction device (1), are described. The noise reduction device (1) includes: a connecting portion (2) configured to be connected with at least a part of the air duct cover (10), and form an accommodation space (6) communicating with an airflow on the outlet side via at least one of the through holes (8); and at least one first chamber (5) and/or at least one second chamber (5'), the first chamber (5) being located in the accommodation space (6) and filled with a sound-absorbing material (7), and the second chamber (5') being located in the accommodation space (6) and configured as a resonant noise-reduction cavity.