Reflow Furnace Gasket Leak Detection Using Sealed-Space Gas Monitoring
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Solution Overview
Problem
Reflow apparatuses face challenges in promptly detecting gasket failures due to heat-induced deterioration and flux fume corrosion, which can lead to in-furnace air leakage, and existing methods require time to determine oxygen concentration abnormalities.
Innovation Solution
A soldering apparatus with a sealed space defined by multiple seals, where a first gas is supplied to measure pressure or concentration, allowing for early detection of gasket failures by reaching predetermined thresholds, and using nitrogen to minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrogen is supplied into a furnace while measuring oxygen concentration to detect gasket failures, then gasket failures can be detected, but detection requires a certain time period for oxygen concentration to decrease to predetermined value
Solution Approach 1:
The patent applies preliminary action by introducing a second gas (nitrogen or inert gas) into the furnace before the actual soldering process begins. This pre-filled gas creates a controlled atmosphere that enables immediate detection of gasket failures through pressure or concentration measurements, eliminating the waiting period required in conventional methods for oxygen concentration to change. The measurement is performed on the second gas itself rather than waiting for compositional changes, achieving rapid detection.
2Loss of energy
If a gasket is used to seal the furnace body to prevent in-furnace air leakage, then heating efficiency is maintained, but the gasket deteriorates due to heat and flux fume corrosion causing failures
Solution Approach 1:
The patent introduces a second gas that is nitrogen or an inert gas into the furnace to create an inert atmosphere. This inert environment protects the gasket from oxidation and chemical corrosion by flux fumes, thereby improving gasket durability and reliability. The inert atmosphere reduces the aggressive chemical environment that normally causes gasket deterioration while maintaining the sealing function for heating efficiency.
3Measurement precision
If oxygen concentration measurement is used to determine gasket failures, then failures can be detected, but the system cannot determine whether abnormalities are caused by gasket failures
Solution Approach 1:
The patent implements feedback by continuously monitoring the concentration or pressure of the second gas (nitrogen or inert gas) that was intentionally introduced into the furnace. Since the amount of second gas introduced is known, any deviation from expected concentration or pressure levels provides direct feedback about gasket sealing status. This feedback mechanism enables not only detection of abnormalities but also determination of their cause, as the second gas acts as a tracer for leak 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 prompt detection of gasket failures and reduces the risk of in-furnace air leakage, allowing for timely maintenance and minimizing the influence on the processing chamber environment.
Implementation Method 1
measuring apparatus configured to measure one of pressure in the sealed space
Implementation Method 2
concentration of gas in the sealed space
Data Source
AI summary
Provided is a soldering apparatus including: a furnace body including a processing chamber in which boards are processed; a gasket provided at least to a part of the furnace body, and configured to seal the furnace body; a sealed space isolated from the processing chamber, and defined by the furnace body and the gasket; a gas supply apparatus configured to supply a first gas into the sealed space; and a measuring apparatus configured to measure one of pressure in the sealed space and concentration of a second gas in the sealed space.