Venting Aspirator Valve for Aircraft Evacuation Pressure Control
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Solution Overview
Problem
Inflatable evacuation devices in aircraft face issues with over-pressurization and premature deployment due to ambient pressure variations, which can lead to undesirable events such as over-pressurization of storage compartments and incorrect pressure checks during testing.
Innovation Solution
A venting aspirator system that includes a venting valve in fluid communication with an aspirator inlet, allowing the device to equalize with ambient air and preventing over-pressurization, while also being designed to automatically close when compressed fluid is received, thereby ensuring safe inflation and reducing the risk of operator error during pressure checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aspirator is designed to receive compressed fluid for inflating evacuation devices, then the inflation function is improved, but over-pressurization and premature deployment occur due to ambient pressure variations
Solution Approach 1:
The venting valve is pre-configured in the open position to allow ambient air to enter the air channel and equalize pressure before compressed fluid is introduced. This preliminary anti-action prevents over-pressurization by counteracting pressure differential effects that would otherwise cause premature deployment or harmful over-pressurization of the evacuation device
Solution Approach 2:
The venting valve acts as an intermediary component between the compressed fluid source and the evacuation device. It mediates the pressure transition by allowing controlled mixing of ambient air with compressed fluid, ensuring smooth pressure equalization and preventing direct over-pressurization of the system
2Adaptability or versatility
If separate vent valve and pressure check fitting components are used, then functionality is complete, but device complexity and operator error risk increase
Solution Approach 1:
The venting valve and pressure check fitting functions are merged into a single integrated component. The venting valve body incorporates both the venting aperture for pressure equalization and the pressure check fitting for testing, eliminating the need for separate components and reducing overall system complexity while maintaining full functionality
Solution Approach 2:
The venting valve is designed as a multi-functional component that simultaneously provides venting capability for pressure equalization and serves as the pressure check fitting for system testing. This universal design allows a single component to perform multiple functions that would traditionally require separate parts, simplifying the overall system architecture
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 venting aspirator system effectively prevents over-pressurization, reduces the risk of operator error, and simplifies the pressure check process by integrating the vent valve and pressure check fitting into a single unit, thus enhancing safety and efficiency during aircraft evacuations.
Implementation Method 1
The venting valve is in an open position to allow the aspirator to equalize with ambient air
Implementation Method 2
a force generated by the compressed fluid moves the venting valve to the closed position
Data Source
AI summary
An aspirator may comprise an aspirator body defining an air channel, an aspirator inlet disposed in the aspirator body whereby the air channel receives a compressed fluid, a venting aperture disposed in the aspirator body in fluid communication with the air channel, and a venting valve disposed in the venting aperture. The venting valve is in an open position and the venting valve moves to a closed position in response to the compressed fluid being received by the aspirator.