Reflow Oven Oxygen Sensing With VOC Cooling and Carbon Filtration
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Solution Overview
Problem
Existing reflow ovens face challenges in accurately detecting and adjusting oxygen concentration in the furnace chamber due to the presence of contaminants from vaporized volatile organic compounds (VOCs), which can affect soldering quality.
Innovation Solution
An oxygen concentration detection system comprising a cooling device with a semiconductor cooler, a filter device using activated carbon, and a detection device, which together condense and purify the sample gas to remove contaminants before measuring oxygen concentration, enabling real-time adjustment of nitrogen input to maintain optimal oxygen levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If direct detection of oxygen concentration in furnace chamber is performed, then detection speed is improved, but detection accuracy deteriorates due to contaminants from vaporized VOCs
Solution Approach 1:
The system performs preliminary cooling and filtering actions on the sample gas before it reaches the detection device. The cooling device condenses VOC contaminants, and the filter device removes them, preparing the gas in advance for accurate detection without compromising detection speed.
Solution Approach 2:
The patent introduces intermediate devices (cooling device and filter device) between the furnace chamber and the detection device. These intermediaries process the sample gas to remove contaminants while allowing the detection to proceed efficiently, resolving the contradiction between speed and accuracy.
2Measurement precision
If cooling and filtering processes are added to the detection system, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical cooling systems with a semiconductor cooler, which achieves efficient cooling through electrical operation. This substitution maintains detection accuracy while reducing mechanical complexity.
Solution Approach 2:
The filter device utilizes porous materials (activated carbon) to achieve effective contaminant removal. This approach provides high filtering efficiency with a relatively simple structure, balancing accuracy improvement with complexity management.
3Object-generated harmful factors
If sample gas is cooled to remove VOC contaminants, then contaminant removal efficiency is improved, but energy consumption increases
Solution Approach 1:
The system optimizes the cooling temperature parameter to achieve effective VOC condensation without excessive energy consumption. By carefully selecting the cooling temperature, the system balances contaminant removal efficiency with energy usage.
Solution Approach 2:
The semiconductor cooler replaces traditional mechanical refrigeration systems, reducing energy consumption while maintaining effective cooling performance for contaminant removal.
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 system achieves timely and accurate detection of oxygen concentration, reducing contaminants to 5.6 ppm, enhancing soldering quality by maintaining precise oxygen levels in the reflow oven furnace chamber.
Implementation Method 1
a cooling device, comprising a semiconductor cooler, that is configured to receive a sample gas from a furnace chamber and cool the received sample gas through the semiconductor cooler
Implementation Method 2
a filter device, which is fluidly connected to the cooling device, that is configured to carry out contaminant filtering on the gas cooled by the cooling device
Data Source
AI summary
The present application discloses an oxygen concentration detection system for detecting the oxygen concentration in a furnace chamber of a reflow oven, comprising: a cooling device, a filter device, and a detection device. The oxygen concentration detection system of the present application utilizes a semiconductor cooler to condense sample gas within the furnace chamber, thereby removing most of the VOC contaminants in the sample gas. Subsequently, by employing activated carbon adsorption filtration, all contaminants in the gas are basically eliminated, resulting in a more accurate detection result from the detection device. Furthermore, due to the rapid cooling capabilities of the semiconductor cooler and the relatively short sample gas flow distance, the oxygen concentration detection system of the present application is also capable of reducing the required detection time, enabling more timely detection from the detection device. Therefore, the oxygen concentration detection system of the present application is capable of timely and accurately detecting the oxygen concentration in a gas within a reflow oven furnace chamber and adjusting the oxygen content therein according to the detection result, thereby enhancing the soldering quality.