Fan Guard with Segmented Flanges for EMI Attenuation and Airflow
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Solution Overview
Problem
Existing fans used in electrical devices face challenges in effectively cooling the devices while minimizing noise and electromagnetic interference (EMI) generated during operation.
Innovation Solution
A fan guard with segmented flanges is designed to allow airflow while providing EMI shielding, comprising segments and flanges that extend beyond the thickness of the segments to form openings, enabling airflow and attenuating EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan operates to cool an electrical device, then cooling efficiency is improved, but electromagnetic interference and noise increase
Solution Approach 1:
The fan guard is divided into multiple segments with flanges that form openings, allowing segmented airflow paths while maintaining EMI blocking through the distributed metal structure
Solution Approach 2:
The flanges extend beyond the segment thickness at critical locations to provide localized EMI attenuation, while openings are positioned to maintain airflow in specific regions
2Object-generated harmful factors
If a fan guard blocks EMI and noise, then electromagnetic interference is reduced, but airflow is obstructed
Solution Approach 1:
The guard structure is segmented into multiple sections with strategically placed openings, allowing EMI blocking through the metal segments while maintaining airflow through the opening arrays
Solution Approach 2:
Flanges extend in the depth dimension beyond the segment thickness, providing EMI attenuation through additional material depth without reducing the lateral opening size, thus maintaining airflow
3Object-generated harmful factors
If flanges extend beyond segment thickness to provide EMI attenuation, then electromagnetic interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The fan guard is constructed from multiple discrete segments with flanges, allowing each component to be manufactured separately and then assembled, simplifying the overall manufacturing process while achieving EMI attenuation
Solution Approach 2:
The flanges extend in the depth dimension rather than requiring complex lateral structures, providing EMI attenuation through straightforward additional material depth that is easy to manufacture
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 fan guard effectively cools the electrical device by maintaining airflow while reducing noise and EMI, thereby improving the operational efficiency and integrity of the electrical device.
Implementation Method 1
each flange has a depth extending transverse to the plane, the depth being greater than the thickness of each segment of the plurality of segments
Implementation Method 2
The fan may direct an airflow through an enclosure of the electrical device to cool the electrical device via convection
Data Source
AI summary
A fan guard that includes an array of openings disposed adjacent to one another along a plane to enable flow of air directed transverse to the plane, segments that each include a face extending along the plane and a thickness extending transverse to the plane, and flanges connected to the segments to cooperatively form the array of openings. Each flange includes a depth extending transverse to the plane, the depth being greater than the thickness of each segment of the plurality of segments.