Rotatable Flap Fan Guard for Unobstructed Airflow
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Solution Overview
Problem
Conventional fan guards in computing systems reduce airflow efficiency due to their design, which is a tradeoff for safety as they obstruct airflow while preventing finger contact with spinning fans.
Innovation Solution
A fan system with a rotatable flap outlet fan guard that can open and close, using springs to maintain the flap in an open position when inserted into a chassis, allowing unobstructed airflow while ensuring safety by preventing finger access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fan guards with ribs are used to prevent finger contact with rotating fans, then safety is improved, but airflow resistance increases and thermal efficiency deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the fan guard movable rather than static. The flexible membrane can dynamically adjust its position between a retracted state (allowing maximum airflow during operation) and an extended state (blocking airflow when powered off). This dynamic adaptability resolves the contradiction by allowing the guard to optimize for airflow during safe operation while providing protection when needed.
Solution Approach 2:
The patent applies parameter changes by altering the physical state and position of the fan guard. The membrane transitions between different positions (retracted vs. extended) and states (flexible vs. rigid when engaged), changing the airflow parameters and safety characteristics accordingly. This allows the system to switch between prioritizing airflow efficiency and prioritizing user safety based on operational conditions.
2Reliability
If fan guards are designed to prevent finger access to rotating blades, then safety is improved, but airflow efficiency deteriorates due to obstruction
Solution Approach 1:
The flexible membrane fan guard dynamically changes its configuration based on operational needs. During fan operation, the membrane is pulled back by airflow or spring force to minimize obstruction, maximizing airflow efficiency. When the fan is powered off, the membrane extends to cover the aperture, providing safety protection. This dynamic behavior resolves the contradiction between safety and productivity.
Solution Approach 2:
The fan guard system is self-regulating through the interaction of airflow pressure and spring force. The membrane automatically adjusts its position based on the operational state of the fan without requiring external control mechanisms. During operation, positive pressure from the fan pulls the membrane back; when off, the spring returns it to the blocking position, providing automatic safety and performance optimization.
3Temperature
If high rotating speeds are used to meet cooling requirements, then cooling performance is improved, but the danger of touching rotating blades increases
Solution Approach 1:
The flexible membrane provides dynamic protection that adapts to the rotating fan blades. During high-speed operation, the membrane remains retracted to allow maximum cooling airflow while still providing a barrier that flexes with the blade motion. When the fan stops rotating, the membrane automatically extends to cover the aperture, preventing contact with stationary blades or debris. This resolves the contradiction by providing context-appropriate protection.
Solution Approach 2:
The patent uses a flexible membrane instead of rigid guard structures. This thin film can flex and deform to accommodate high-speed rotating blades during operation without creating turbulence or obstruction, while still maintaining a protective barrier. When rotation stops, the flexible membrane returns to its blocking configuration, providing safety without compromising the high-speed cooling performance achieved during operation.
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 enhances airflow efficiency by minimizing air resistance while maintaining safety by ensuring the flap remains open during operation, thus improving fan system performance compared to conventional designs.
Implementation Method 1
at least one spring configured to urge the at least one flap into the closed position
Implementation Method 2
allowing unobstructed airflow while ensuring safety by preventing finger access
Data Source
AI summary
A fan system and a computing system with the fan system are disclosed. The fan system includes a fan module. The fan module includes a housing configured to retain a fan and a motor to rotate the fan. The housing includes an air inlet aperture on an air inlet side of the housing and an air outlet aperture on an air outlet side of the housing. The fan system further includes an outlet fan guard coupled to the fan module on the air outlet side of the housing. The outlet fan guard includes at least one flap rotatable between a closed position, covering the air outlet aperture of the housing, and an open position, uncovering the air outlet aperture of the housing. The outlet fan guard further includes at least one spring urging the at least one flap into the closed position.