Blast Door Locking System with Compressible Seal
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Solution Overview
Problem
Conventional blast doors with overlapping arrangements are ineffective in maintaining a seal when exposed to explosive events from either side, leading to security vulnerabilities and seal integrity issues due to uneven pressure distribution and excessive stress on latching and bolting mechanisms.
Innovation Solution
A translating security door system with a vertically or horizontally moving door that extends beyond the access corridor, equipped with a compressible seal and robust locking mechanisms, including a telescoping hydraulic cylinder and compliant door guides, to ensure sealing against pressure from either side and distribute loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overlapping door arrangement is used, then seal integrity is improved when pressure is applied from the overlapping side, but seal integrity deteriorates when pressure is applied from the non-overlapping side
Solution Approach 1:
The door assembly is designed with an overlapping configuration where the door overlaps the facility wall on one side, creating asymmetric seal engagement. This asymmetric design provides inherent resistance to pressure from the overlapping side while the locking mechanism compensates for the non-overlapping side vulnerability
Solution Approach 2:
The locking mechanism is designed to engage the door in a pre-determined locked position before an explosive event occurs. This preliminary positioning ensures the door is firmly secured against the facility wall, optimizing the seal engagement and preparing the system to withstand pressure from either direction
2Reliability
If an overlapping door arrangement is used, then seal integrity is improved in one direction, but stress on latching and bolting mechanisms increases due to lack of pressure transfer to the facility
Solution Approach 1:
The locking mechanism is extracted from the conventional integrated door design and positioned within the facility wall structure. This separation allows the locking mechanism to be directly supported by the facility wall, removing the burden of withstanding full explosive pressure from the latching and bolting components while maintaining effective seal engagement
3Reliability
If a robust locking mechanism is implemented to carry the entire load, then security is improved, but device complexity and stress on fasteners increase
Solution Approach 1:
The locking mechanism is extracted from the door and positioned in the facility wall, allowing it to be a simpler, more focused component that engages directly with the wall structure rather than carrying the entire explosive load through complex door-mounted assemblies
Solution Approach 2:
The locking mechanism is merged with the facility wall structure, creating a unified load-bearing system where the wall and locking mechanism work together to withstand explosive pressure, eliminating the need for overly complex door-mounted locking assemblies
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 system maintains seal integrity and security by evenly distributing pressure loads and preventing rearward deflection of the door, reducing the risk of seal failure and enhancing resistance against explosive events from either direction.
Implementation Method 1
various sealing schemes are incorporated to prevent leakage of dangerous materials and gases
Implementation Method 2
a system for translating the door within the door passage along the major as from an open position
Data Source
AI summary
Methods and apparatus are provided for securely blocking and sealing an access corridor to a secure facility. The exemplary system includes a penetration resistant door disposed in a passage intersecting the access corridor, and dividing it into first and second sides. An actuating mechanism translates the door within the passage between an open position in which the corridor is unblocked, and a closed position in which the corridor is blocked by the door. A locking system is configured to push the door toward one side of the access corridor when the door is in the closed position, compressing a seal disposed between the door and the passage wall, and sealing the first side of the access corridor from the second side.