Reflow Furnace Oxygen Feedback Control for Precise Nitrogen Use
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Solution Overview
Problem
In reflow soldering furnaces, manual adjustment of gas control valves leads to low precision and slow regulation of oxygen concentrations, resulting in inefficient gas usage and increased production costs, especially during work stoppages or intermissions.
Innovation Solution
A gas control system that includes an oxygen detecting device and a controller to automatically regulate the input of working gas, ensuring precise and fast adjustment of oxygen concentrations in the furnace chamber, and allows for timely closure of the gas control valve during non-operational periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment of gas control valves is used, then the system is simple to operate, but the control precision and regulation speed of oxygen concentration are low
Solution Approach 1:
The patent implements automatic control by introducing feedback from oxygen concentration detection to gas valve regulation. The controller receives real-time oxygen concentration data from detection devices and automatically adjusts the gas control valve to maintain desired concentration levels, eliminating manual intervention and significantly improving control precision.
Solution Approach 2:
The system performs self-regulation of oxygen concentration through automated feedback control. The controller autonomously monitors oxygen levels and adjusts gas flow without human intervention, enabling the system to self-correct deviations and maintain optimal conditions continuously.
2Speed
If manual adjustment of gas control valves is used, then the system is easy to operate, but the regulation speed of oxygen concentration is slow
Solution Approach 1:
Real-time feedback from oxygen detection devices enables immediate response to concentration changes. The controller continuously monitors oxygen levels and automatically adjusts gas flow without human intervention, achieving rapid regulation speed while eliminating manual operation requirements.
Solution Approach 2:
The patent replaces manual mechanical valve adjustment with an automated electromechanical control system. The controller electronically actuates the gas control valve based on detected oxygen levels, eliminating the delay inherent in manual operation and achieving faster regulation response.
3Loss of energy
If gas control valve remains open during work stoppages, then the system is continuously ready, but gas waste and energy loss increase
Solution Approach 1:
The gas control valve transitions from static open/closed states to dynamic automated control. The system automatically adjusts valve position based on real-time oxygen concentration and operational status, closing during work stoppages to prevent waste while maintaining readiness during operation through continuous monitoring and adjustment.
Solution Approach 2:
The controller uses feedback from operational status detection and oxygen concentration monitoring to automatically control valve timing. During work stoppages, the system detects the idle state and closes the valve to prevent gas waste, while automatically reopening when operation resumes, eliminating the need to maintain continuous gas flow.
4Productivity
If automatic gas control system is implemented, then control precision and regulation speed improve, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions including oxygen concentration monitoring, valve actuation, and operational status detection within a single integrated device. This multi-functionality consolidates what would otherwise require separate components, improving productivity while limiting the increase in overall system complexity.
Solution Approach 2:
The automated feedback control system continuously monitors oxygen concentration and automatically adjusts gas flow, eliminating manual intervention. This automation significantly improves control efficiency and productivity, with the complexity increase offset by the elimination of manual operation requirements and the integrated nature of the control system.
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 system achieves precise control and rapid regulation of oxygen concentrations, preventing gas waste and reducing costs by automatically adjusting nitrogen input based on real-time oxygen detection and predetermined set values.
Implementation Method 1
an oxygen detecting device...is configured to detect an oxygen concentration in the furnace chamber
Data Source
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AI summary
The present application relates to a gas control system and method for a reflow soldering furnace, comprising: an oxygen detecting device, capable of coming into contact with a gas in a furnace chamber, for detecting an oxygen concentration in the furnace chamber; an intake valve device, for controllably establishing fluid communication between a working gas source and the furnace chamber, thereby inputting the working gas into the furnace chamber; and a controller, for controlling the opening extent of at least one intake valve device based on an oxygen concentration signal, thereby regulating a flow rate of the working gas inputted into the furnace chamber. With a gas control system and method according to the present application, an oxygen concentration in a furnace chamber is detected in real time, and a gas control valve is automatically regulated on the basis of a predetermined set value or target value to control input of a working gas, achieving precise control and fast regulation; in addition, when work is stopped or during work intermissions, a gas control valve can be closed in a timely manner, thereby preventing waste and reducing costs.