Axial Fan Flap Guard Structure for Failed-Fan Backflow Blocking
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Solution Overview
Problem
Airflow recirculation or backflow through a failed fan in electronic devices can lead to higher component temperatures and reduced airflow, as operational fans pull air back through the failed fan when installed in parallel.
Innovation Solution
A backflow blocking apparatus comprising a folded sheet with flaps that open to allow normal airflow when the fan is operational and fall to block airflow when the fan fails, preventing backflow by attaching to the fan exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fans are installed in parallel for cooling, then cooling capacity is improved, but backflow through failed fans causes reduced airflow and higher temperatures
Solution Approach 1:
The patent applies the dynamics principle by using movable flaps that can change position between open and closed states. The flaps are hinged to allow automatic movement: they remain open during normal fan operation to maintain airflow, and automatically close when a fan fails to prevent backflow. This dynamic adaptation resolves the contradiction by enabling the system to switch between maximizing cooling capacity and preventing backflow-induced temperature rise.
Solution Approach 2:
The patent implements self-service through automatic detection and response to fan failure. The movable flaps are positioned and configured to automatically close when a fan stops operating, eliminating the need for external detection systems or manual intervention. The system self-regulates airflow based on fan operational status, maintaining cooling efficiency while preventing backflow automatically.
2Reliability
If a backflow blocking device is added to prevent backflow, then airflow efficiency is improved, but device complexity increases
Solution Approach 1:
The patent uses thin, flexible flap structures instead of rigid blocking mechanisms. These flaps are made from flexible materials that can easily move between open and closed positions in response to airflow changes. This approach provides effective backflow prevention while adding minimal complexity to the fan assembly, as the flexible flaps integrate seamlessly with existing fan structures.
Solution Approach 2:
The backflow blocking function is segmented into individual movable flaps for each fan or fan group, rather than using a single complex blocking mechanism. Each flap operates independently based on local airflow conditions, simplifying the overall system by distributing the backflow prevention function across multiple simple, autonomous elements.
Data Source
AI summary
A backflow blocking apparatus for axial fans may be provided. The apparatus may comprise a sheet. The sheet may comprise a first section and a second section. The first section may comprise a plurality of flaps cut out of and retained by the first section of the sheet. The second section may comprise a guard structure. The apparatus may further comprise a fold about which the first section and the second section are folded on one another. The guard structure may inhibit the movement of the plurality of flaps in a direction toward the guard structure when the first section and the second section are folded on one another.