Oxygen-Depleted Motor Cooling for Aircraft Fuel Tank Inerting
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Solution Overview
Problem
Existing fuel tank inerting systems in aircraft face challenges with motor insulation degradation due to oxygen presence, which accelerates electrical insulation breakdown, especially when cooling is insufficient.
Innovation Solution
A system that generates oxygen-depleted fluid using a compressor and air separation module, directing the oxygen-depleted fluid to the motor for cooling and subsequently to the fuel tank, thereby reducing oxygen exposure and extending motor life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air-cooled motor is used in fuel tank inerting system, then cooling function is provided, but insulation system degradation occurs due to oxygen presence
Solution Approach 1:
The patent applies the inert atmosphere principle by replacing oxygen-containing air with nitrogen-enriched inert gas for motor cooling. The air separation module generates nitrogen-enriched gas by separating oxygen from air, and this inert gas is directed to cool the motor. This eliminates the harmful oxidation effect on insulation systems while maintaining effective cooling, thereby resolving the contradiction between cooling function and insulation degradation.
2Use of energy by moving object
If oxygen-rich air is used for motor cooling, then cooling efficiency is maintained, but motor life is reduced due to accelerated insulation breakdown
Solution Approach 1:
The patent implements an inert environment by using nitrogen-enriched gas produced from the air separation module to cool the motor. This inert gas provides the same cooling efficiency as oxygen-rich air but without the harmful oxidation that accelerates insulation breakdown. The result is extended motor life while maintaining cooling efficiency.
Solution Approach 2:
The patent converts the harmful effect of oxygen into a benefit by using the air separation module to remove oxygen from air, transforming the harmful oxygen-containing cooling air into beneficial nitrogen-enriched inert gas. This gas then serves to cool the motor without causing oxidation damage, effectively converting a harmful factor into a protective one.
3Reliability
If air separation module is added to remove oxygen, then motor insulation degradation is prevented, but system complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the air separation module to serve dual purposes: generating nitrogen-enriched inert gas for motor cooling and providing fuel tank inerting. This integration allows the system to achieve insulation protection and extended motor life without proportionally increasing complexity, as the same gas generation capability serves multiple protective functions.
Solution Approach 2:
The patent merges the motor cooling function with the fuel tank inerting function by using the same air separation module and nitrogen-enriched gas supply system for both purposes. This consolidation reduces overall system complexity compared to having separate systems for cooling and inerting, while still achieving the goal of preventing insulation degradation.
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 use of oxygen-depleted fluid for motor cooling slows insulation system degradation and extends motor life by reducing oxygen exposure, improving cooling efficiency and system reliability.
Implementation Method 1
A downstream flow control valve is controlled or passively operated to apply back pressure on the air separation module to force some amount of air through the membrane as opposed to flowing through the tube. Oxygen passes more easily through the membrane
Implementation Method 2
The oxygen-depleted fluid is directed to the motor to provide cooling thereto
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Systems and methods for generating oxygen-depleted fluid are described. The systems include a compressor (310), a motor (322) operably coupled to the compressor (310) by a shaft and configured to rotationally drive the compressor (310) through the shaft, and an air separation module (320) configured to receive a supply air as an input and generate oxygen-rich fluid and oxygen-depleted fluid as an output. The oxygen-depleted fluid is directed to the motor (322) to provide cooling thereto.