Fan Tray Perforation Pattern for EMI and Thermal Tradeoffs
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Solution Overview
Problem
Fan tray perforation patterns face a tradeoff between electromagnetic interference (EMI) shielding and thermal cooling properties, with traditional patterns failing to provide sufficient airflow and aesthetically pleasing designs while being cost-effective.
Innovation Solution
A fan tray perforation pattern featuring concentric circles with unique perforations combining straight lines and large curvature lines, arranged in a radial direction to enhance airflow and EMI shielding, while conserving material and offering an aesthetically pleasing design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional fan tray perforation patterns are used, then EMI shielding is provided, but airflow is insufficient and thermal cooling performance is poor
Solution Approach 1:
The patent applies local quality by varying the perforation density and pattern in different regions of the fan tray. The concentric circle pattern with radially spaced perforations creates zones of different air flow resistance, allowing optimized airflow distribution across the fan face while maintaining EMI shielding where needed. This regional variation resolves the contradiction between EMI shielding and airflow by making different parts of the tray serve different functions.
Solution Approach 2:
The patent uses curved concentric circle patterns instead of straight-line or grid patterns for perforation arrangement. This curvature optimizes the airflow paths by following the natural radial flow pattern from the fan blades, improving thermal cooling performance while maintaining adequate EMI shielding through the distributed perforation pattern.
2Productivity
If more perforations are added to improve airflow, then thermal cooling improves, but EMI shielding deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the perforation pattern by using concentric circles with specific radial spacing and angular distribution. This parameter optimization allows achieving high airflow rates through the curved pattern while the distributed nature of the perforations maintains EMI shielding effectiveness, resolving the tradeoff between airflow rate and EMI shielding.
3Temperature
If fan speed is increased to improve cooling, then thermal management improves, but energy consumption increases
Solution Approach 1:
The patent changes the geometric parameters of the perforation pattern to optimize airflow efficiency. The concentric circle pattern with radially spaced perforations reduces flow resistance and improves air movement efficiency, allowing the fan to achieve the same cooling effect at lower speeds, thus reducing energy consumption while maintaining thermal management performance.
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 provides a minimum 60% air-opening ratio, at least 2 dB improvement in EMI shielding, and efficient energy usage by allowing fans to run at lower speeds, resulting in improved thermal management and reduced energy consumption.
Implementation Method 1
a substantially circular fan having an inner radius corresponding to an inner perimeter of the pattern and an outer radius corresponding to an outer perimeter of the pattern. When the fan rotates, air may be pushed out through the plurality of perforations
Data Source
AI summary
An apparatus is provided in one example embodiment and includes a plate having a plurality of perforations configured in a pattern. The pattern includes the plurality of perforations arranged in concentric circles centered at a point. Each of the perforations is a closed shape comprising four edges, with rounded corners between adjacent edges, with two opposite edges of each of the perforations including non-parallel straight lines and two other opposite edges comprise concentric, offset curved lines. The non-parallel straight lines may form an angle with a vertex at the point, and the concentric curved lines may be centered at the point. The perforations in each concentric circle may be angularly spaced around the point. The apparatus may further include a substantially circular fan.