Multi-Fan System with Gravity-Actuated Flaps for Failure Isolation
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Solution Overview
Problem
Fan systems with multiple fans fail to maintain cooling efficiency when one fan malfunctions, leading to overheating of electrical and electronic components due to air current imbalances.
Innovation Solution
The implementation of flaps between fans that automatically adjust to an open position during operation and close by gravity when a fan fails, ensuring continuous airflow and cooling, with counterweights to balance the flaps' weight and limit the opening angle to prevent air escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple fans are operated simultaneously to provide cooling, then cooling capacity is improved, but system reliability deteriorates because a single fan failure causes complete system failure due to air current short circuits
Solution Approach 1:
A flap is introduced as an intermediary element between the fan and the airflow path. The flap acts as a mediator that automatically closes when a fan fails, preventing the harmful short circuit of air currents while allowing normal operation when all fans are functional. This intermediary component enables the system to maintain reliability without sacrificing cooling capacity.
Solution Approach 2:
The flap is designed to automatically respond to fan failure conditions without external control systems. When a fan stops rotating, the airflow change causes the flap to close automatically, sealing off the failed fan. This self-service mechanism eliminates the need for complex sensors or control logic while maintaining system reliability.
2Reliability
If flaps are made heavy to ensure they close reliably when a fan fails, then reliability is improved, but the opening speed and responsiveness deteriorate
Solution Approach 1:
A counterweight is attached to the flap to create a balance between the need for reliable closing and rapid opening. The counterweight offsets the flap's weight, allowing the flap to close reliably under normal airflow conditions while reducing the force required to open it quickly when needed. This creates an equilibrium that satisfies both requirements.
Solution Approach 2:
The flap's effective weight is dynamically adjusted through the counterweight mechanism. During normal operation, the counterweight balances the flap weight to ensure reliable closing. When the fan starts or stops, the changing airflow conditions temporarily alter the effective parameters, enabling rapid opening or closing responses without requiring the flap to be inherently heavy or light.
3Power
If the flap opening angle is limited to prevent air escape, then cooling efficiency is improved, but the airflow distribution uniformity deteriorates
Solution Approach 1:
The flap design incorporates local quality variations through its specific geometry and hinge positioning. The flap is shaped and positioned to create localized airflow modifications that compensate for the restricted opening angle. This allows the system to maintain high cooling efficiency by preventing air escape while the local airflow patterns remain sufficiently uniform for effective cooling distribution.
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
Ensures uninterrupted cooling airflow even if a fan fails, maintaining the operational integrity of electrical and electronic components by sealing the failed fan and redirecting airflow from neighboring fans.
Implementation Method 1
The open position is caused by the air flow of the associated fan and the closed position by gravity
Implementation Method 2
The open position is caused by the air flow of the associated fan
Implementation Method 3
at least one counterweight is attached to the approach of the flaps, which should compensate for the flap weight as best as possible
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The fan system with at least two, preferably three or more fans, arranged side by side in a horizontal position rotatable about their vertical axis, is characterized in that each fan is provided with a flap which is movable between an open position in which the flap is inclined relative to the vertical and a closed position in which it covers the associated fan, wherein the open position is caused by the airflow of the associated fan and the closed position by gravity.