Aircraft Ventilation Flap With Fusible Heat-Triggered Fire Closure
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Solution Overview
Problem
Aircraft ventilation systems face challenges in protecting equipment from flames entering through ventilation grilles without increasing the aircraft's mass, as traditional firewalls are heavy and not always effective.
Innovation Solution
A ventilation device with a self-closing flap system, featuring an elastically deformable closed position holding system and a fusible open position holding system, which automatically closes the flap when exposed to heat, preventing flame ingress without the need for additional firewalls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional firewalls are installed to protect equipment from flames, then fire protection is improved, but aircraft mass increases significantly
Solution Approach 1:
The patent applies a dynamic self-closing flap mechanism that transitions from an open state during normal operation to a closed state when fire is detected. The flap is connected to a fusible link that melts at a specific temperature, automatically triggering the closure action without adding heavy permanent firewalls. This dynamic response provides fire protection only when needed, eliminating the constant mass penalty of traditional firewalls.
Solution Approach 2:
The fire protection system is self-activating through the fusible link mechanism. When exposed to fire, the fusible link automatically melts and releases the flap, which then closes under the action of a spring or elastic element. This self-service mechanism eliminates the need for complex detection systems or manual intervention, providing reliable fire protection while maintaining minimal mass.
2Reliability
If firewalls are installed near ventilation grilles, then equipment protection is improved, but aerodynamic efficiency deteriorates
Solution Approach 1:
The ventilation flap system maintains an open position during normal flight, preserving aerodynamic efficiency and airflow characteristics. Only when fire is detected does the flap close, at which point aerodynamic considerations become secondary to fire protection. This dynamic behavior eliminates the continuous aerodynamic penalty that would result from permanent firewall installations.
Solution Approach 2:
The fusible link is pre-positioned in the heat path near the ventilation grille, creating a preliminary protective barrier. When fire approaches, the fusible link melts first, triggering the flap closure before flames can reach the equipment. This preliminary anti-action protects equipment without requiring the flap or firewall to be in the closed position during normal operation.
3Weight of stationary object
If a self-closing flap system is implemented, then the need for additional firewalls is reduced, but device complexity increases
Solution Approach 1:
The patent merges the ventilation flap function with the fire protection function into a single integrated component. The same flap that controls airflow during normal operation also serves as the fire barrier when closed. The fusible link mechanism is integrated into the flap assembly rather than being a separate system. This merging eliminates the need for additional firewalls and reduces overall system complexity despite the added self-closing capability.
Solution Approach 2:
The ventilation flap is designed with multi-functionality: it serves as an airflow control element during normal operation and as a fire barrier when closed. The fusible link mechanism provides both the triggering mechanism for closure and the structural connection between the flap and housing. This universal design allows a single component to perform multiple functions, reducing the need for additional specialized fire protection 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 system effectively limits flame passage into the aircraft's inner zone, reducing the need for additional firewalls and maintaining aerodynamic efficiency by automatically closing the flap when exposed to heat, thus protecting equipment without increasing the aircraft's mass.
Implementation Method 1
an open position holding system (50) that is fusible and designed to hold the flap (44) in the open state against the closed position holding system (48)
Implementation Method 2
a closed position holding system (48) that is elastically deformable and designed to push and hold the flap (44) in the closed state
Data Source
AI summary
A ventilation device comprising a ventilation grille comprising a frame delimiting at least one opening, at least one flap designed to be in an open state in which the flap at least partially opens the opening and a closed state in which the flap blocks the opening, at least one articulation connecting the flap and the frame, a closed position holding system that is elastically deformable and designed to push and hold the flap in the closed state, an open position holding system that is fusible and designed to hold the flap in the open state against the closed position holding system, enabling the flap to be closed automatically. Also an aircraft having at least one such ventilation device.