Fire Detector Air Flow Sensing for Blockage Verification
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Solution Overview
Problem
Automatic fire detectors face challenges in ensuring continuous operational capability due to potential blockages or obstructions that can prevent smoke particles from entering the measuring chamber, leading to false negatives in fire detection, and existing testing methods are time-consuming and costly.
Innovation Solution
Incorporating a flow sensor system that measures the flow of ambient air to assess the operational capability of the fire detector, with an evaluation device that generates error messages for blockages or obstructions, and using internal and external flow sensors to differentiate between chamber closure and external obstructions, while also considering environmental factors like temperature and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual or automatic testing of the fire alarm system is performed using existing methods (gas reservoir with test gas), then the operational capability can be checked, but the testing process becomes time-consuming and costly
Solution Approach 1:
The fire detector performs self-diagnostics by continuously monitoring its own operational parameters (smoke detection capability, alarm signaling function, power supply status) without requiring external testing equipment or manual intervention. The control device automatically evaluates the functionality of all components and generates test results, enabling the system to verify its own operational capability independently.
Solution Approach 2:
The patent replaces the mechanical/chemical testing method (gas reservoir with test gas) with an electronic monitoring system. The control device uses electronic sensors and signal processing to continuously assess the operational status of the fire detector components, substituting physical test gas injection with electronic self-diagnostics.
2Reliability
If comprehensive testing of the fire alarm system is performed to ensure operational capability, then reliability is improved, but the complexity and cost of the testing device increases
Solution Approach 1:
The control device serves multiple functions: it controls the alarm signaling device, monitors smoke particle concentration, evaluates the functionality of all system components, stores measurement data, and generates test results. By making the control device multi-functional, the patent eliminates the need for separate dedicated testing equipment, thereby reducing overall system complexity while maintaining comprehensive operational verification.
Solution Approach 2:
The patent combines the testing functionality with the existing control device of the fire alarm system. Instead of adding a separate complex testing apparatus, the control device is enhanced to perform self-diagnostics and functionality evaluation, merging multiple functions into a single integrated unit.
3Reliability
If the measuring chamber is continuously monitored for smoke particles, then fire detection reliability is improved, but the risk of false negatives due to blockages increases
Solution Approach 1:
The control device continuously receives feedback from smoke particle sensors and other system components, monitoring their operational status in real-time. This feedback mechanism allows the system to detect anomalies such as blockages in the measuring chamber and generate appropriate test results, thereby maintaining detection reliability while identifying potential failures.
Solution Approach 2:
The system performs preliminary functionality checks and continuous monitoring of component status before actual fire detection is required. By continuously evaluating the operational capability of sensors and signaling devices, the system prepares for potential fire events while detecting blockages or failures in advance, preventing false negatives.
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 reduces the need for manual inspections, enhances the reliability of fire detection by accurately determining operational status, and minimizes false alarms by using flow measurements to assess the fire detector's usability and detect potential fires more effectively.
Implementation Method 1
The sensor system includes at least one flow sensor for detecting a flow of the ambient air as the measured variable for evaluating the operational capability of the fire detector
Implementation Method 2
Optical measurement chambers include a diode that produces a beam of light. In the case of smoke particles in the ambient air, the light beam of the diode is scattered in the measuring chamber, with the scattered light hitting a sensor, which detects an increased concentration of particles due to the scattered light
Data Source
AI summary
The automatic fire detector (1) has a housing (10) with a measuring chamber (11) for detection of smoke particles, and a sensor system for detecting a measurement variable for evaluating the operational capability of the automatic fire detector. An evaluation device is provided for evaluating the operational capability of the automatic fire detector on the basis of the measurement variable. The sensor system comprises a flow sensor for detecting the flow as the measurement variable for evaluating the operational capability of the automatic fire detector.