Fire Damper Drive With Smoke and Temperature Triggering
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Solution Overview
Problem
Conventional fire dampers with thermal interrupters react slowly to fire scenarios, inadequately preventing smoke spread and requiring manual checks of fusible links, making them unsuitable for heat tests.
Innovation Solution
A drive device for fire dampers equipped with a temperature sensor, gas sensor, and a switch module that combines air temperature and combustion gas content to determine when to switch the power supply off, allowing faster and more selective fire detection, and includes a thermal interrupter as a fallback for reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal interrupter with fusible link is used to trigger fire damper closure, then the system is simple and reliable, but the response time is slow and smoke spread prevention is inadequate
Solution Approach 1:
The patent combines a thermal interrupter (mechanical reliability) with an electric drive system equipped with temperature and gas sensors (fast response). This hybrid approach merges the simplicity and reliability of mechanical fusible links with the rapid detection capabilities of electronic sensors, enabling both fast response to fire conditions and dependable system operation.
Solution Approach 2:
The electric drive system acts as an intermediary between the thermal interrupter and the fire damper mechanism. The thermal interrupter can trigger the electric drive, which then rapidly actuates the damper closure, bridging the gap between slow mechanical triggering and the need for fast damper response.
2Device complexity
If a thermal interrupter with fusible link is used, then the system structure is simple, but manual checking and replacement of thermal breakers is required
Solution Approach 1:
The electric drive system with automated sensors and control logic performs self-monitoring and self-actuation. The temperature and gas sensors continuously detect fire conditions, and the electric drive automatically responds without requiring manual intervention for operation or maintenance, eliminating the need for manual checking and replacement of thermal breakers.
Solution Approach 2:
The patent replaces the purely mechanical thermal interrupter system with an electrically actuated system. The electric motor-driven mechanism substitutes for manual operation and mechanical fusible link replacement, enabling automated control and reducing maintenance requirements through electrical rather than mechanical means.
3Device complexity
If only temperature-based thermal interrupters are used, then the system is simple to implement, but fire detection is not selective enough and may not detect fires at lower temperatures
Solution Approach 1:
The patent merges temperature sensing with gas detection capabilities in the fire detection system. By combining thermal interrupters with electric sensors that detect both temperature and combustion gases, the system achieves more selective and accurate fire detection that can identify fires at lower temperatures through gas presence, overcoming the limitations of temperature-only detection.
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
Enables quicker and more selective fire detection, reducing smoke spread while maintaining reliability, even if the switch module fails, and allows for efficient control of fresh air supply.
Implementation Method 1
a temperature sensor for measuring an air temperature value
Implementation Method 2
a gas sensor for measuring a content of combustion gases in the air
Implementation Method 3
The thermal trigger includes a fusible link that melts at a predetermined melting temperature, for example at 72° C., thereby acting as a thermal interrupter that breaks a circuit
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A drive apparatus (1) for a fire damper (2) comprises an electric drive (10), which holds the fire damper in the normal position when power is supplied and moves it into a safety position when no power is supplied. In addition to a thermal contact breaker (12), which interrupts the power supply to the drive (10) at a melt temperature, the drive apparatus (1) also comprises a temperature sensor (13) for measuring the air temperature value (T), a gas sensor (14) for measuring the content (G) of fumes in the air, and a switch module (15), which interrupts the power supply depending on the air temperature value (T) and the content (G) of fumes in the air. In the event of a fire, the fire damper can thus be moved into a safety position not only when the temperature in the region of the thermal contact breaker (12) is high, but already when smoke or gas develops as a result of the fire.