Self-testing Fire Door with Triaxial Hall Effect Sensors
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Solution Overview
Problem
Fire doors often experience gaps between the door and frame that increase over time due to settling or sagging, leading to reduced effectiveness of passive fire protection systems, as regular manual inspections are costly and prone to human error, and may go unnoticed for extended periods.
Innovation Solution
A self-testing fire door system equipped with triaxial Hall effect sensors and a processor to remotely measure distances between the door and frame, alerting users to deviations and scheduling maintenance, and optionally including inertial measurement units to detect stuck open doors and intumescent material functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection of fire door gaps is performed regularly, then measurement accuracy is improved, but inspection frequency is limited due to cost and availability of qualified surveyors
Solution Approach 1:
The fire door system performs self-inspection using integrated distance sensors that automatically measure gaps between the door and frame. The processor analyzes sensor data to detect deviations from acceptable tolerances, enabling the system to monitor its own condition without requiring external surveyors for routine inspections.
Solution Approach 2:
Manual mechanical measurement methods are replaced with electronic distance sensors and automated processing systems. The sensor-based measurement system continuously monitors gap dimensions and communicates deviations digitally, eliminating the need for manual measurement tools and human surveyors.
2Loss of information
If manual inspection of fire door gaps is performed, then measurement capability is achieved, but human error reduces reliability
Solution Approach 1:
Human manual measurement is replaced with electronic distance sensors and automated data processing. The system objectively records gap dimensions and compares them against predefined tolerances, eliminating subjective judgment and human error associated with manual inspection.
Solution Approach 2:
The system provides immediate feedback when gap measurements deviate from acceptable tolerances. The processor analyzes sensor data in real-time and generates alerts when deviations are detected, enabling prompt corrective action and maintaining continuous awareness of door condition.
3Device complexity
If fire door gaps are not monitored continuously, then system simplicity is maintained, but gaps may exceed tolerances reducing fire protection effectiveness
Solution Approach 1:
Continuous electronic monitoring replaces periodic manual inspection. Distance sensors mounted on the door frame and door continuously measure gap dimensions, with the processor analyzing data to detect deviations from acceptable tolerances, ensuring continuous fire protection effectiveness.
Solution Approach 2:
The monitoring system operates continuously rather than periodically, maintaining constant surveillance of door gap conditions. This ensures that any deviation from acceptable tolerances is detected immediately, maintaining uninterrupted fire protection effectiveness.
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
Ensures consistent and accurate monitoring of fire door gaps, reducing human error and extending inspection intervals, thereby enhancing the reliability of passive fire protection systems by providing timely alerts and maintenance scheduling.
Implementation Method 1
the first distance sensor comprises three Hall effect sensors arranged such that each Hall effect sensor is aligned along different axes to each of the other Hall effect sensors in a triaxial arrangement
Data Source
AI summary
Once a fire door has been installed, the door will typically require regular inspection to ensure that the fire door is still able to operate as intended. An issue typically seen with fire doors is related to the gaps between the door and the frame that being too large. The present disclosure provides a self-testing fire door system 100 comprising a first distance sensor 140 arranged to measure a first distance between a fire door 110 and a door frame 120. The first distance sensor 140 comprises a first sensor member 141 arranged on the door frame 120 and a second sensor member 142 arranged on the fire door 110 adjacent to the first sensor member 141 when the fire door 110 is in a closed position. The system 100 further includes a processor configured to measure, via the first distance sensor 140, a distance between the fire door 110 and the frame 120 and output the first distance.