Manifold Block Valve Assembly for Aircraft Duct Leak Detection
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Solution Overview
Problem
Existing leak detection systems in aircraft ducting fail to detect leaks through cracks of a 5mm diameter hole due to insufficient air flow and temperature reduction as hot air passes through insulation, and they struggle with differentiating between acceptable and hazardous leakage levels, especially under high temperatures and pressures.
Innovation Solution
The implementation of a manifold assembly with a combination of metal and elastomeric materials, including a flow control valve and temperature-responsive sensor wires, to maintain a fluid-tight seal and detect leaks effectively, using a check valve and adjustable spring element to accommodate varying pressure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot air passes through insulation blanket to reach vent disk hole, then leak detection is enabled, but temperature is significantly reduced making detection impossible
Solution Approach 1:
The patent introduces a flow control valve as an intermediary component positioned between the insulation blanket and the vent disk hole. This valve actively regulates and directs the hot air flow, preventing excessive cooling while maintaining reliable leak detection capability.
Solution Approach 2:
The flow control valve performs preliminary action by pre-regulating the hot air flow before it reaches the detection point. This ensures that the air maintains sufficient temperature and velocity to trigger the detection system, addressing the temperature reduction problem proactively.
2Object-affected harmful factors
If insulation blanket impedes hot air passage to vent disk hole, then thermal protection is provided, but air flow is insufficient for detection
Solution Approach 1:
The flow control valve serves as a mediator that bridges the insulation blanket and the vent disk hole. It allows the insulation to provide thermal protection while simultaneously ensuring sufficient air flow quantity reaches the detection point by actively directing the hot air stream.
3Measurement precision
If check valve is used to differentiate leakage levels, then hazardous leak detection is improved, but device complexity increases
Solution Approach 1:
The check valve operates on a self-service principle, automatically differentiating between acceptable and hazardous leakage levels through its inherent mechanical design. It opens or closes based on pressure differential alone, providing precise leak level differentiation without requiring complex electronic controls or additional power sources.
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 enhances the detection of leaks in aircraft ducting systems by maintaining air flow velocity and temperature sensitivity, allowing for accurate differentiation between normal and hazardous leakage, ensuring reliable operation under harsh conditions.
Implementation Method 1
a flow control valve having a ball, a seat and a spring
Implementation Method 2
When pressure within the joint cover chamber exceeds a threshold pressure, gas therein may apply a force against the flow control device that causes it to open
Implementation Method 3
temperature-responsive sensor wires, to maintain a fluid-tight seal and detect leaks effectively
Data Source
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AI summary
A manifold assembly (300) configured for integration with a joint cover apparatus in a ducting system to detect leaking gas comprises an elastomeric manifold block (303) having a substantially circular inlet aperture and one or more gas passages (307) (308) fluidly coupled to the inlet aperture. The assembly includes a flow control valve ((309) and (305)) configured to maintain a closed state in which a component (305) of the flow control valve sealedly engages with the inlet aperture (306) to preclude gas at the inlet aperture from flowing into the one or more gas passages until said gas reaches a pressure corresponding to a pressure threshold. The assembly also includes at least one aperture control plate (304) disposed substantially proximate to a lower end of the manifold block and including a substantially circular opening. The aperture control plate (304) is adapted to maintain the substantial circularity of the inlet aperture, so as to ensure a substantially fluid-tight seal.