Pure Formic Acid Gas Supplying Device for Soldering
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Solution Overview
Problem
Traditional formic acid gas supplying devices in soldering systems suffer from low partial pressure and concentration of formic acid, leading to reduced reactivity and increased cycle time, resulting in decreased soldering efficiency and high formic acid consumption.
Innovation Solution
A pure-formic-acid-gas-supplied soldering system that uses a vacuum chamber to evaporate liquid formic acid, eliminating other gases and allowing precise control over formic acid concentration, thereby enhancing reactivity and reducing consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nitrogen is pumped into liquid formic acid for aeration to generate mixed gas, then formic acid gas can be supplied, but the partial pressure and concentration of formic acid gas become low (40-50 torr, about 5%), resulting in reduced reactivity and prolonged soldering cycle time
Solution Approach 1:
The patent extracts nitrogen from the gas mixture by using a condensation trap that selectively condenses nitrogen while allowing formic acid gas to pass through. This separation process concentrates the formic acid gas by removing the diluting nitrogen component, directly resolving the contradiction between low concentration and prolonged cycle time.
Solution Approach 2:
The patent changes the physical state parameters by condensing nitrogen at controlled temperatures while maintaining formic acid gas in vapor phase. By adjusting the temperature parameter in the condensation trap, the system transforms the gas mixture into concentrated pure formic acid gas, thereby improving concentration and reducing soldering cycle time.
2Speed
If nitrogen is used as carrier gas in the formic acid gas supply system, then gas flow can be maintained, but nitrogen obstructs contact between formic acid molecules and metal oxides, decreasing reaction rate
Solution Approach 1:
The condensation trap extracts nitrogen from the gas stream by selective condensation, removing the obstructing carrier gas while preserving the reactive formic acid gas. This extraction process eliminates the barrier between formic acid molecules and metal oxides, directly increasing the reaction rate.
3Reliability
If formic acid gas is supplied at low concentration mixed with nitrogen, then gas flow can be controlled, but formic acid gas diffuses shallowly into solder powder, failing to reach the center and reducing soldering quality and reliability
Solution Approach 1:
The system extracts nitrogen from the mixed gas through selective condensation, producing high-concentration pure formic acid gas. This concentrated gas achieves adequate diffusion depth into the solder powder, ensuring complete redox reaction throughout the powder including the center, thereby improving soldering quality and reliability.
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 significantly shortens soldering cycle time, improves soldering quality and reliability, and reduces formic acid consumption, leading to increased productivity and cost-effectiveness.
Implementation Method 1
The heating assembly is connected to the bottom base of the tank and is capable of heating the bottom base so that the bottom base is capable of heating the liquid formic acid to evaporate the liquid formic acid and transform the liquid formic acid into the formic acid gas
Implementation Method 2
The vacuum pump communicates with the vacuum pipelines of the multi-vacuum-chamber soldering furnace and is capable of withdrawing air from the vacuum chamber to form a vacuum inside the vacuum chamber
Data Source
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AI summary
A pure formic acid gas supplying device (10) comprises a tank (11), a liquid pipeline (12), a heating assembly (13), and at least one gas pipeline (16). The tank (11) has a sealed inner space (114). The liquid pipeline (12) communicates with the inner space (114) and is adapted to feed in liquid formic acid. The heating assembly (13) is connected to the tank (11) and is capable of heating the tank (11) to heat the liquid formic acid to evaporate it. The gas pipeline (16) is connected to the tank (11), communicates the inner space (114) above the liquid level, and is adapted to output pure formic acid gas. The pure formic acid gas supplying device (10) improves soldering efficiency by supplying pure formic acid gas.