Aircraft Vent Bypass Flow Regulator for Altitude-Driven Waste Expulsion
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Solution Overview
Problem
The existing vacuum waste systems in aircraft face challenges in regulating airflow rates at higher altitudes, leading to excessive expulsion of solid and liquid waste components and moisture, which can obstruct the vent line, due to the use of binary check valves that cannot modulate flow rates effectively.
Innovation Solution
A bypass flow regulator with a valve assembly, including umbrella valves or flexible materials, is integrated into the aircraft's vent line to modulate the airflow rate to a predetermined maximum, preventing excessive expulsion of waste components and ensuring the airstream is free of solids and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a binary check valve is used in the vent line, then the system structure is simple, but the flow rate cannot be regulated leading to excessive waste expulsion
Solution Approach 1:
The patent replaces the static binary check valve with a dynamic flow regulator that can continuously adjust the effective flow area. The regulator includes a movable element that responds to pressure differential across the vent line, dynamically modulating the flow rate to match system capacity at varying altitudes, thus resolving the contradiction between structural simplicity and flow regulation capability.
Solution Approach 2:
The invention changes the flow rate parameter by incorporating a regulator whose flow area varies with operating conditions. The regulator's effective flow area automatically adjusts based on the pressure differential, allowing the system to maintain optimal flow rates across different altitude conditions without complex manual control, thereby achieving flow regulation while maintaining reasonable structural simplicity.
2Productivity
If the vent line is left unobstructed for high flow rate, then airflow is maximized, but waste components and moisture are expelled into the atmosphere
Solution Approach 1:
The flow regulator modifies the flow rate parameter to a predetermined maximum value that matches the vortex separator's capacity. By adjusting the effective flow area to this optimal value, the system maintains high productivity while ensuring that the airstream velocity and residence time are sufficient for complete waste component removal, preventing harmful expulsion.
Solution Approach 2:
The flow regulator incorporates a feedback mechanism where the pressure differential across the vent line controls the regulator's opening. This automatic feedback ensures that the flow rate never exceeds the system's waste removal capacity, as the pressure conditions themselves regulate the flow to prevent waste expulsion while maintaining maximum safe productivity.
3Productivity
If flow rate is increased to handle high altitude suction, then waste removal capacity is exceeded, but the binary valve cannot modulate to prevent obstruction
Solution Approach 1:
The flow regulator provides dynamic flow rate adjustment that automatically adapts to changing altitude and pressure conditions. As the aircraft climbs and pressure differential increases, the regulator dynamically reduces the effective flow area to maintain the flow rate within the vortex separator's capacity, ensuring reliable operation and preventing vent line obstruction from condensed or frozen waste.
Solution Approach 2:
The flow regulator is designed to self-regulate based on the pressure differential across the vent line without external control. The regulator's movable element responds automatically to pressure changes, reducing flow area when suction increases at higher altitudes, thereby self-adjusting to prevent waste expulsion and maintain reliable vent line clearance throughout the flight profile.
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 bypass flow regulator effectively regulates airflow rates, preventing waste components from being ejected into the atmosphere and ensuring the airstream is moisture-free, thereby maintaining system capacity and preventing vent line obstruction at varying altitudes.
Implementation Method 1
The IVS generates a vortex flow by redirecting the waste stream to remove solid and liquid waste components (e.g., centrifugally)
Implementation Method 2
The IVS generates a vortex flow by redirecting the waste stream to remove solid and liquid waste components (e.g., centrifugally)
Implementation Method 3
the valves include valves capable of moderating the flow rate by partially deforming
Data Source
AI summary
A bypass flow regulator for a vacuum waste system (VWS) is disclosed. The bypass flow regulator includes a valve assembly installable in an aircraft vent line leading outside the aircraft from an onboard VWS waste tank. The vent line directs an airstream pumped from the waste tank to an external outlet under suction (from which outlet the airstream is ejected from the aircraft). The valve assembly includes a group of valves (e.g., umbrella valves) set into the path of the airstream. The valves may collectively modulate the flow rate of the airstream by adjusting their effective flow area.