Fan Cover Opening Geometry for Low Pressure Drop Cooling
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Solution Overview
Problem
Existing fan covers for actively cooled electronic units, such as those in the automotive field, cause a pressure drop in airflow due to their restrictive geometry and pose a risk of accidental contact with the fan rotor.
Innovation Solution
A fan cover design featuring a central circular opening and multiple lens-shaped openings defined by two circular arcs with different radii, optimized to minimize airflow turbulence and friction, enhancing volumetric flow and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fan cover is used to prevent accidental contact with the fan rotor, then safety is improved, but airflow pressure drop increases
Solution Approach 1:
The fan cover is segmented into multiple openings (a central circular opening and additional lens-shaped openings) instead of a single large opening or solid cover. This segmentation allows the cover to maintain safety by blocking direct access to the rotor while providing sufficient airflow paths to minimize pressure drop. The multiple openings distribute the airflow across different locations on the cover.
Solution Approach 2:
The lens-shaped openings are defined by two circular arcs with different radii, creating a curved, lens-like geometry. This curvature is optimized to minimize airflow turbulence and friction as air passes through the openings. The rounded edges at the endpoints of the arcs further reduce turbulence, thereby minimizing pressure drop while maintaining effective safety coverage.
2Reliability
If a restrictive fan cover geometry is used to ensure safety, then protection is improved, but volumetric flow decreases
Solution Approach 1:
The cover is divided into multiple strategically positioned openings that collectively provide sufficient volumetric flow while maintaining protection. The central circular opening provides a primary airflow path, while the additional lens-shaped openings distributed around the cover provide supplementary flow paths, ensuring adequate cooling without compromising safety.
Solution Approach 2:
The lens-shaped geometry with optimized circular arcs creates smooth airflow paths that minimize turbulence and friction losses. This curved design allows for larger effective opening areas compared to straight-edged openings of the same bounding box, thereby increasing volumetric flow while maintaining the protective function.
3Reliability
If a fan cover with minimal openings is used to maximize safety, then accident prevention is improved, but cooling efficiency decreases
Solution Approach 1:
The cover incorporates multiple openings rather than a single large opening, allowing the design to balance safety and cooling efficiency. The distributed openings provide sufficient total area for effective cooling while maintaining accident prevention by preventing direct contact with the rotor. Each opening contributes to the overall cooling capacity.
Solution Approach 2:
The optimized lens-shaped openings with circular arcs minimize airflow resistance and turbulence, maximizing the cooling efficiency for each unit of opening area. This allows the cover to achieve effective cooling with smaller, more safely positioned openings compared to conventional designs.
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 new design significantly reduces airflow pressure drop while preventing accidental contact with the fan rotor, thereby maximizing cooling potential.
Implementation Method 1
the end points may further comprise a rounded edge to minimize losses in the airflow due to turbulence and/or friction
Data Source
Figure 1
AI summary
A fan cover comprises a cover plate with a plurality of openings, wherein the openings comprise a circular opening around a center and at least one further opening that is lens-shaped.