Gas Appliance Security Device Using Thermocouple Control
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Solution Overview
Problem
Conventional security devices for gas appliances operating in low-oxygen environments are prone to malfunction and failure due to fatigue and jamming of magnetic and spring components, leading to risks of carbon monoxide poisoning.
Innovation Solution
A security device comprising a gas valve, thermocouple, and controller that uses electrical signals to regulate gas supply to the combustor based on thermoelectric potential, with a comparison unit to determine oxygen levels and control the valve accordingly, including features like air blower activation and alarm systems for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional security devices use magnetic and spring components to control gas valve operation, then the device can respond to heat changes and regulate gas flow, but the magnetic and spring elements are prone to fatigue and jamming causing malfunction or failure
Solution Approach 1:
The patent replaces the conventional mechanical security device (using magnetic coils and spring mechanisms) with an electronic control system. The electronic controller receives signals from the thermocouple and directly actuates the gas valve electronically, eliminating magnetic and spring components that are prone to fatigue and jamming. This substitution of mechanical systems with electronic systems resolves the reliability issue while maintaining the safety function.
Solution Approach 2:
The patent extracts and removes the problematic magnetic and spring elements from the security device mechanism. By taking out these unreliable mechanical components and replacing them with solid-state electronic controls, the invention eliminates the sources of fatigue and jamming while preserving the essential safety monitoring and gas control functions.
2Measurement precision
If the security device uses thermoelectric potential to monitor combustor heat and control gas supply, then it can detect incomplete burning conditions, but it requires accurate threshold comparison to prevent false operation
Solution Approach 1:
The patent utilizes changes in thermoelectric potential parameters (voltage levels) as the combustor heat changes. The electronic controller monitors these parameter changes and compares them against predetermined thresholds to determine when incomplete burning is occurring. This parameter-based control approach enables accurate detection of combustion conditions without requiring complex mechanical measurement mechanisms.
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 solution provides a reliable and accurate system to prevent carbon monoxide accumulation by adjusting gas supply and ventilation, reducing the risk of poisoning and ensuring safe operation in low-oxygen conditions.
Implementation Method 1
The thermocouple is provided beside the combustor to generate a thermoelectric potential because of a heat of the combustor, wherein the thermoelectric potential is directly proportional to the heat of the combustor
Data Source
AI summary
A gas appliance has a security device and a combustor. The security device has a gas valve, a thermocouple, and a controller. The thermocouple receives a heat of the combustor and generates thermoelectric potential accordingly. The controller controls the gas valve according to the thermoelectric potential. While the thermoelectric potential is lower than a high level, the controller controls the gas valve to reduce the gas supplied to the combustor, and while the thermoelectric potential is lower than a low level the controller controls the gas valve to stop the gas supplied to the combustor to avoid the incomplete burning because of insufficient oxygen.