Aircraft Cargo Fire Suppression via Direct Agent Injection
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Solution Overview
Problem
Existing aircraft fire suppression systems often rely on dispersing fire suppressants outside cargo containers or depressurizing the aircraft, which may not effectively address fires within cargo containers, leading to inefficiencies and potential safety risks.
Innovation Solution
A system that includes a supply of fire suppressant agent, a conduit, an inlet attached to cargo containers, a valve controlled by a computer controller and detector, allowing for direct delivery of fire suppression agent into the cargo container based on detected fire conditions, potentially combined with aircraft depressurization to reduce oxygen and combat the fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire suppressants are dispersed outside cargo containers, then the system can treat external areas, but the fire suppression effectiveness inside containers is insufficient
Solution Approach 1:
The fire suppression system is segmented by providing individual containers with separate detectors and suppressant delivery mechanisms. Each container operates independently with its own fire suppression system, allowing targeted suppression inside containers without requiring complex aircraft-wide system modifications.
Solution Approach 2:
The patent introduces punctureable seals as intermediaries between the external fire suppression system and the interior of containers. These seals can be intact during normal operations but can be punctured to allow suppressant delivery when needed, serving as a mediator that enables both container integrity and fire suppression capability.
2Reliability
If aircraft depressurization is used to reduce oxygen, then fire can be suppressed, but cargo containment and delivery reliability deteriorates
Solution Approach 1:
Instead of applying depressurization globally to the entire aircraft, the system applies fire suppression locally to individual containers. Each container has its own detector and suppressant delivery system, allowing fire suppression to be confined to the specific location where fire is detected, preventing harmful effects on other cargo.
Solution Approach 2:
The fire suppression function is extracted from the aircraft-wide environmental control system and implemented as independent container-level systems. This separation allows fire suppression to occur without affecting the overall aircraft pressure and environment, eliminating the harmful side effects of global depressurization.
3Reliability
If self-contained fire suppressant systems are installed inside containers, then fire suppression is effective, but system weight and complexity increase
Solution Approach 1:
The fire suppressant supply system serves multiple functions: it can deliver suppressant to multiple different containers through a single centralized supply, and the same infrastructure supports both normal container operations and fire suppression operations. This multi-functionality reduces the need for separate dedicated systems for each container.
Solution Approach 2:
The patent merges the fire suppression infrastructure with the existing container handling and security systems. The punctureable seals and suppressant delivery mechanisms are integrated into the container structure itself, combining fire suppression functionality with the container's existing framework rather than adding completely separate systems.
4Reliability
If mechanisms to puncture containers and blow in foam are used, then fire suppression is achieved, but container integrity and cargo protection are compromised
Solution Approach 1:
The system uses punctureable seals that are designed to be punctured only under specific conditions (fire detection). These seals maintain container integrity during normal operations and provide a controlled opening mechanism only when needed, cushioning against unnecessary container compromise while enabling fire suppression when required.
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 approach enables effective suppression of fires within cargo containers by delivering fire suppressants directly to the source, reducing system weight, complexity, and cost while allowing for safer and more efficient cargo transportation.
Implementation Method 1
a detector located inside the cargo container
Implementation Method 2
delivery of fire suppression agent directly into the cargo containers
Implementation Method 3
involve depressurization of the aircraft to reduce oxygen
Data Source
AI summary
An example system for suppressing a fire condition in an aircraft includes a supply of fire suppressant agent on-board the aircraft, a conduit coupled to the supply of fire suppressant agent and configured to carry fire suppression agent, an inlet located downstream of the conduit that is coupled to the conduit and is configured to be attached to a cargo container in the aircraft to deliver the fire suppression agent directly into the cargo container, a valve connected to the conduit between the supply of fire suppressant agent and the inlet, a detector located inside the cargo container, and a computer controller in communication with the valve and in communication with the detector, and controlling operation of the valve for delivery of the fire suppression agent into the cargo container based on an output received from the detector.