Aircraft Backup Breathing Gas System with Pressure-Actuated Reservoir
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Solution Overview
Problem
In aircraft emergency oxygen systems, there is a risk of crew members being without supplemental oxygen during critical times if the primary emergency oxygen system fails, highlighting the need for a reliable secondary source of breathing gas.
Innovation Solution
A secondary breathing gas system with a reservoir connected via a secondary line to the primary line, actuated by a pressure switch upon pressure loss, ensuring a continuous supply of oxygen to the crew masks, with a pressure reducer to adjust gas pressure to a usable level and a check valve to prevent backflow into the primary system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary emergency oxygen system is installed in aircraft, then crew members can receive supplemental oxygen during normal operations, but the system may fail and leave crew members without oxygen during critical times
Solution Approach 1:
The patent implements a secondary oxygen reservoir that is pre-filled and stands by to provide oxygen supply if the primary system fails. This beforehand cushioning ensures that crew members have a backup oxygen source ready before any failure occurs, thereby improving reliability without requiring complex real-time detection and switching mechanisms.
Solution Approach 2:
The secondary oxygen reservoir is pre-positioned and pre-filled with oxygen, and the system includes pre-configured check valves and actuators that are ready to activate automatically upon pressure loss detection. This preliminary preparation ensures immediate oxygen supply continuity without requiring complex real-time decision-making or manual intervention.
2Reliability
If a secondary oxygen reservoir is added to the system, then oxygen supply reliability is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent utilizes high-pressure storage (e.g., 3000 psig) to increase the density of oxygen in the secondary reservoir, thereby storing sufficient oxygen for crew members without requiring a large physical volume. This parameter change allows the system to maintain reliability while minimizing the space occupied by the secondary reservoir.
Solution Approach 2:
The patent employs metal-organic frameworks (MOFs) as a composite material for oxygen storage in the secondary reservoir. MOFs provide high surface area and porosity, enabling efficient oxygen storage at reduced volumes compared to traditional pressure vessels, thus resolving the contradiction between reliability and volume requirements.
3Loss of substance
If check valves are installed to prevent backflow, then gas loss is prevented, but the device complexity increases
Solution Approach 1:
The patent divides the oxygen supply system into distinct segments with check valves positioned at specific locations (e.g., between primary and secondary lines, and at the mask interface). This segmentation prevents backflow in each segment independently, ensuring oxygen conservation without requiring a complex centralized control system. Each check valve operates autonomously based on pressure differential.
Solution Approach 2:
The check valves in the system are passive components that automatically prevent backflow based on pressure differential without requiring external control signals, power, or complex mechanisms. This self-service approach prevents oxygen loss while maintaining system simplicity, as the valves respond autonomously to pressure changes.
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 provides a reliable secondary source of breathing gas to crew members, ensuring continuous oxygen supply even if the primary system fails, maintaining safety by preventing gas loss back into the primary system and optimizing gas storage efficiency using metal-organic frameworks (MOFs) for enhanced volume-to-pressure ratios.
Implementation Method 1
A pressure switch is configured to sense a gas pressure in the primary line
Implementation Method 2
A primary line check valve is configured to prevent a flow of gas from the secondary line to a source side of the primary line
Data Source
AI summary
A system and a method for providing a secondary source of breathing gas to a mask are disclosed. The system includes secondary reservoir having a breathing gas, the secondary reservoir connected to a primary line by a secondary line. A pressure switch detects a pressure in the primary line and, upon a pressure lower than a threshold, actuates an actuator to permit the flow of breathing gas from the secondary reservoir through the secondary line. A valve may be configured to prevent a flow of gas from the secondary line to a source side of the primary line. The method includes detecting gas pressure and actuating an actuator upon a low gas pressure to permit a flow of secondary gas to the breathing mask by way of a secondary line. The gas may be prevented from flowing from the secondary line to a source side of the primary line.