Removable Fan Flapper Design for Server Cage Airflow Sealing
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Solution Overview
Problem
Existing server system fan cage flaps allow air leakage and debris entry when not in use, disrupting airflow and increasing temperature, and current solutions have gaps that reduce effectiveness and require removal when fans are installed.
Innovation Solution
A removable flap design with a main segment, vertical extensions, and a tapered extension that includes a flat and angled section, allowing for easy installation and removal, and positioning within the cage to block airflow when not in use, made from heat-resistant materials like plastic or metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a flap is installed to block air flow to an empty cage, then air leakage is decreased and chassis temperature is maintained, but air leakage still occurs through the gap between the open cage and the flap
Solution Approach 1:
The flap incorporates a curved surface that contacts the cage wall, creating a sealing interface that minimizes the gap between the flap and the cage opening. This curved geometry allows the flap to conform to the cage structure and reduce air leakage paths.
Solution Approach 2:
The flap is designed to be removable and repositionable, allowing it to transition between a deployed position that blocks the cage opening and a retracted position that allows access. This dynamic capability enables the flap to adapt to different operational states while maintaining sealing effectiveness when deployed.
2Loss of energy
If a flap is installed to block the cage, then air leakage is reduced, but the flap needs to be removed when a temperature regulating device is installed in the cage
Solution Approach 1:
The flap is designed as a removable component that can be easily installed and removed from the cage. The removal and installation process is simplified through a straightforward mounting mechanism that does not require complex tools or procedures, allowing quick transitions between blocking and access modes.
Solution Approach 2:
The flap is designed as a separate, independent component from the cage structure and the temperature regulating device. This segmentation allows the flap to be removed when device installation is needed while maintaining its air-blocking function when in place, without interfering with the cage or device structures.
3Object-generated harmful factors
If a traditional flap design is used, then it can block air flow, but it allows gaps that permit air leakage and debris entry
Solution Approach 1:
The curved surface of the flap creates an optimized sealing interface with the cage wall, minimizing gaps and crevices where debris could enter. The curved geometry allows for better contact and sealing compared to flat surfaces, reducing pathways for contaminant infiltration.
Solution Approach 2:
The design accepts that some gap space exists between the flap and cage but uses the curved surface geometry to convert this potential harmful gap into a beneficial sealing surface that directs airflow smoothly while minimizing leakage paths and preventing debris entry.
Data Source
AI summary
A flap for a cage for holding electronic devices in a computing system is disclosed. The flap includes a main segment, a first vertical extension, a second vertical extension, a lateral ledge, and a tapered ledge. The first vertical extension and the second vertical extension extend from a first side of the main segment. The lateral ledge extends from a third side of the main segment. The tapered extensions extend from a second side of the main segment and include a flat section and an angled section. The flap has a deployed position and a stored position in the cage. The flap engages with at least two sides of the cage in the deployed or the stored position. The flap may be in the stored position when an electronic component is present. The flap blocks airflow through the cage in the deployed position.