Aircraft Outflow Valve Bidirectional Airflow Control
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Solution Overview
Problem
Aircraft pressurizing and ventilating systems face issues with increased cabin temperatures, humidity, and overheating due to failures in primary air pressure sources, leading to increased costs, weight, and complexity when alternate air supply systems are required.
Innovation Solution
The development of outflow valves that provide greater net airflow by controlling air flow direction, allowing air to enter and exit the aircraft in specific configurations, eliminating the need for a separate backup system by utilizing existing valves in both intake and exhaust configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an alternate air supply system is added to handle primary system failures, then aircraft reliability is improved, but device complexity increases
Solution Approach 1:
The outflow valve is designed to perform multiple functions: normal exhaust operation and alternate air supply during primary system failures. By configuring the valve to bidirectionally control airflow, the system eliminates the need for separate backup air supply components, reducing overall system complexity while maintaining reliability
Solution Approach 2:
The patent combines the exhaust function and intake function into a single outflow valve assembly. The valve structure integrates both the exhaust gate for normal operation and the intake gate for backup operation, merging what would traditionally be separate systems into one unified component
2Reliability
If an alternate air supply system is added to handle primary system failures, then aircraft reliability is improved, but aircraft weight increases
Solution Approach 1:
The outflow valve serves dual purposes as both an exhaust valve during normal operation and an alternate air supply valve during failures. This multi-functionality eliminates the need for additional dedicated backup air supply equipment, thereby reducing aircraft weight while maintaining air supply reliability
Solution Approach 2:
The existing outflow valve structure is utilized to provide backup air supply functionality. By making the existing valve self-sufficient to handle both exhaust and intake operations, the system avoids adding separate backup components that would increase aircraft weight
3Reliability
If an alternate air supply system is added to handle primary system failures, then aircraft reliability is improved, but cost increases
Solution Approach 1:
The outflow valve is designed to perform multiple functions: normal exhaust operation and alternate air supply during primary system failures. By configuring the valve to bidirectionally control airflow, the system eliminates the need for separate backup air supply components, reducing overall system complexity while maintaining reliability
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
This solution increases airflow for ventilation and cooling during loss of inflow conditions, reducing the need for a backup system, thereby decreasing aircraft weight, complexity, and cost.
Implementation Method 1
a pressure differential is detected between the interior of the aircraft and the exterior of the aircraft
Data Source
AI summary
Outflow valves for use in an aircraft are described. In one example, an outflow valve (102, 104) for use in an aircraft (100) includes a frame (202) configured for coupling to an aircraft and a gate (204) pivotally coupled to said frame. The frame includes a forward flange (228) extending above the frame. The gate is pivotally moveable between a closed position to substantially block airflow between an interior of the aircraft and an exterior of the aircraft and an exhaust position to direct airflow from the interior toward the exterior of the aircraft. The forward edge (220) of the gate is located adjacent the frame forward flange as the gate is pivoted between the closed position to the exhaust position.