Ventilation Shaft Rotatable Panels for Underground Flood Sealing
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Solution Overview
Problem
Existing solutions for preventing flooding in underground ventilation systems, such as raising ventilation gratings or using sandbags, are either costly, labor-intensive, or inadequate in addressing the influx of surface water during heavy rains and storm surges, particularly in low-lying areas like New York City.
Innovation Solution
A manual closure assembly for ventilation shafts that includes rotatable panels which can be easily operated to close the passage between the ventilation shaft and the atmosphere, preventing water from entering underground tunnels, featuring a support structure with horizontal flanges and a self-actuating drain closure mechanism to ensure effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation gratings are raised above sidewalk level to prevent flooding, then flooding protection is improved, but sidewalk area for pedestrians is reduced and implementation cost increases
Solution Approach 1:
The patent employs movable panels that can dynamically change position between a raised state (allowing ventilation) and a lowered state (blocking water entry). This dynamic mechanism provides flood protection without permanently occupying sidewalk space, resolving the contradiction between reliability and area utilization.
2Reliability
If sandbags and plywood covers are used to prevent flooding, then flooding protection is improved, but labor intensity and material requirements increase
Solution Approach 1:
The panels are designed to be self-deploying through gravitational force. When released, they automatically rotate downward to block water entry without requiring manual placement like sandbags. This self-service mechanism dramatically reduces labor intensity while maintaining flood protection effectiveness.
3Reliability
If panels are lowered to seal the passage, then flooding protection is improved, but ventilation function is reduced
Solution Approach 1:
The system dynamically adjusts panel position based on flooding conditions. During normal conditions, panels remain raised to maintain ventilation. During flooding threats, panels rotate downward to seal the passage. This dynamic switching resolves the contradiction between protection and ventilation productivity.
4Reliability
If a manual closure assembly is installed, then flooding protection is improved, but device complexity increases
Solution Approach 1:
The panel mechanism utilizes gravitational potential energy as the driving force. Panels naturally rotate downward when released, requiring no complex motors or actuators. This equipotential design leverages gravity to simplify the mechanical system while maintaining effective flood protection.
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 solution provides a simple, fast, and cost-effective method to prevent flooding in underground ventilation systems by allowing ventilation when not needed and automatically sealing against water entry during flooding threats, effectively managing storm water and reducing the risk of inundation in subway systems and similar structures.
Implementation Method 1
one or more panels rotatable about a horizontal axis perpendicular to the passage from or to an upright home position in which the panels do not obstruct the passage to a lower passage closing position
Data Source
Figure 1
Figure 2A~3B
Figure 4~5A
AI summary
Apparatus allowing ventilation through a ventilation shaft to an underground ventilation duct fluidly communicating through the ventilation shaft to an atmospheric opening of the shaft and on threat of flooding operable to prevent downward flow of surface water into the ventilation duct includes support sidewalls fitting in the shaft providing a ventilation passage between support top and bottom openings and a suspension member supported on opposed lateral sidewalls proximate the top opening holding one or more hinge connected panels that manually release to rotationally close the passage and are manually rotationally liftable to a home position allowing ventilation. A panel drain automatically closes when the panel is raised to home position so it is already closed when the panel is released to rotationally close the passage.