Thermal Bolt Shielding for Smoke Detector Reliability
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Solution Overview
Problem
Conventional smoke detectors are not suitable for installation in areas like residential garages, car ports, and commercial automotive service centers due to exposure to exhaust gases, smoke, dust, moisture, and temperature fluctuations, leading to false alarms and reduced effectiveness in detecting fires.
Innovation Solution
A smoke detector system featuring a thermal bolt and case that shields the detector from contaminants until a threshold temperature is reached, automatically deactivating the shielding to allow smoke detection, comprising a threaded bolt with a thermal element that changes state at a controlled temperature, and a thermal case with a lid that falls away to expose the detector to smoke when the temperature exceeds the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smoke detector is installed in a garage or similar environment, then it can detect fires in these high-risk areas, but it will be exposed to exhaust gases, dust, moisture and temperature fluctuations causing false alarms and reduced reliability
Solution Approach 1:
The patent applies preliminary action by providing a shield that proactively protects the smoke detector sensor from contaminants before false alarms can occur. The shield is pre-positioned in the detection chamber and automatically deployed when temperature conditions indicate a fire event, preventing the harmful effects of exhaust gases and dust from reaching the sensor during normal garage operation.
Solution Approach 2:
The patent utilizes parameter changes by employing a temperature-responsive material that changes its physical state based on temperature. The shield material transitions from a blocked state at normal temperatures to an open state at fire temperatures, automatically adjusting the level of protection based on the thermal conditions without requiring external control systems.
2Reliability
If a shield is added to protect the smoke detector from contaminants, then false alarms are prevented, but the device complexity increases
Solution Approach 1:
The patent applies self-service by designing a shield that automatically responds to temperature changes without requiring external power sources, control electronics, or manual operation. The temperature-responsive material self-activates when exposed to fire conditions, opening the shield to allow smoke detection while maintaining protection during normal conditions, thereby preventing false alarms through autonomous behavior.
Solution Approach 2:
The patent employs phase transitions by using a temperature-responsive material that undergoes a physical state change at a specific temperature threshold. This phase transition enables the shield to automatically switch between protected and open states based on thermal conditions, providing complex functionality through a simple physical phenomenon rather than mechanical or electronic control systems.
3Reliability
If the shielding is deactivated automatically at threshold temperature, then timely smoke detection is enabled, but the response time may be delayed compared to conventional detectors
Solution Approach 1:
The patent applies parameter changes by using a temperature-responsive material with a specifically selected transition temperature that matches typical fire conditions. The shield remains closed at normal temperatures to prevent false alarms but automatically opens when the temperature reaches the threshold indicative of a fire, enabling timely smoke detection without permanent shielding delays.
Solution Approach 2:
The patent converts the potential harm of delayed detection into a benefit by using the temperature rise itself as the triggering mechanism for shield activation. The same thermal condition that indicates a fire also automatically opens the shield, ensuring that detection is enabled precisely when needed without requiring separate sensing and actuation systems.
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 provides reliable smoke detection in previously unsuitable locations by preventing false alarms from contaminants and ensuring timely detection of fires, while maintaining the integrity of the smoke detector sensor and reducing maintenance needs.
Implementation Method 1
a thermal bolt coupled to the shielding thermal case and containing a thermal element which changes its state at a threshold temperature
Implementation Method 2
a thermal case shielding the detector and a thermal bolt coupled to the shielding thermal case
Data Source
AI summary
A smoke detector system includes a shielding structure enclosing a smoke detector, smoke detector circuit board or other contents. The shielding structure seals the contents from smoke, exhaust gasses, dust, chemicals, moisture, insects and other airborne particulates. The shielding structure is maintained sealed by a thermal bolt containing a thermal element which changes its state at a threshold temperature indicative of a developing fire and breaks the sealing of the shielding structure once the predetermined temperature has been reached. A lid of the shielding structure is held in place against a mounting plate by the thermal bolt. When the thermal bolt reaches the threshold temperature, it loses the integrity and allows the lid separation from the mounting plate to automatically open the shielding structure, thus allowing an internally mounted smoke detector or smoke detector circuit board to monitor the presence of smoke.