Fan Docking Collar Sealing Against Recirculation
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Solution Overview
Problem
Fan-based cooling systems experience decreased performance due to air recirculation from the fan exhaust back to the inlet, which is exacerbated by poor sealing and exacerbated in high-density electronics enclosures requiring more cooling, leading to increased energy consumption, noise, and vibration.
Innovation Solution
A pliable fan docking collar with a tapered interior and annular seals is used to create a snug, tortuous path between the fan outlet and inlet, sealing against both the enclosure wall and fan housing to prevent air recirculation, made from a thermoplastic elastomer for flexibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a fan is removably mounted to accommodate hot swapping, then ease of repair is improved, but sealing performance deteriorates due to additional gaps and cracks
Solution Approach 1:
The fan assembly is segmented into a removable fan unit and a stationary docking collar, allowing the fan to be easily removed and replaced while the collar remains fixed in the enclosure wall. This segmentation enables hot swapping without compromising the overall sealing structure.
Solution Approach 2:
The docking collar acts as an intermediary component between the fan and the enclosure wall. It provides a stable, sealed mounting interface that remains in place during fan replacement, preventing air leaks while allowing the fan to be easily swapped.
2Productivity
If high performance fans are used to provide increased cooling flow, then productivity is improved, but harmful factors worsen due to higher pressure differentials causing more acute air leaks
Solution Approach 1:
The high pressure differential generated by high-performance fans, which normally exacerbates air leaks, is converted into a beneficial sealing force. The pressure differential presses the flexible collar against the enclosure wall and fan housing, enhancing the seal rather than compromising it.
Solution Approach 2:
The collar is designed with flexible material properties that allow it to deform under pressure. As the fan operates at high pressure differentials, the collar material adjusts its shape and sealing force dynamically, maintaining an effective seal across varying operating conditions.
3Loss of energy
If air recirculation occurs from fan exhaust to inlet, then loss of substance worsens, but device complexity remains unchanged
Solution Approach 1:
The docking collar is constructed from flexible material that can deform to create effective seals in irregular gaps and cracks. This flexible sealing approach prevents air recirculation without requiring complex mechanical sealing mechanisms or multiple components.
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 eliminates air recirculation, allowing fans to operate at lower speeds with improved cooling efficiency, reduced noise, and energy savings while accommodating hot-swapping without compromising the seal.
Implementation Method 1
made from a thermoplastic elastomer for flexibility and stability
Data Source
AI summary
A fan docking collar for sealing between a fan housing of a fan and an enclosure wall to improve fan performance by preventing flow recirculation. The docking collar includes a pliable body that defines an opening for air flow. The body has a seal for mating with the fan housing and a rim for sealing against the enclosure wall.