Nitrogen Flow Regulator With Visual Feedback for HVAC Brazing
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Solution Overview
Problem
In the HVAC industry, achieving the correct nitrogen flow during purging and brazing operations is crucial to prevent the formation of deleterious oxides, as excessive nitrogen can create pinholes and insufficient nitrogen can lead to oxide formation, causing system failures and filter fouling.
Innovation Solution
A flow regulator system that includes a gas source, pressure regulator, and flow regulator with a visual indication of gas flow rate, allowing for precise control of nitrogen flow during purging and brazing operations to maintain the line free of oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If nitrogen flow rate is increased during brazing, then oxide formation is prevented, but pin holes are created and braze quality deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the nitrogen flow rate within a specific range (3-5 SCFH) during brazing. The flow regulator device enables continuous adjustment of the flow parameter to optimize both oxide prevention and braze quality, avoiding the harmful effects of both excessive and insufficient flow rates.
Solution Approach 2:
The patent implements feedback through visual indicators (float position in sight glass, flow rate markings) that provide real-time information about the nitrogen flow rate. This allows the operator to monitor and adjust the flow to maintain it within the optimal range, ensuring both oxide prevention and high-quality braze without creating pin holes.
2Reliability
If nitrogen flow rate is decreased during brazing, then pin holes are avoided, but oxide formation occurs causing system failure
Solution Approach 1:
The patent applies parameter changes by precisely controlling the nitrogen flow rate within a specific range (3-5 SCFH) during brazing. The flow regulator device enables continuous adjustment of the flow parameter to optimize both oxide prevention and braze quality, avoiding the harmful effects of both excessive and insufficient flow rates.
Solution Approach 2:
The patent implements feedback through visual indicators (float position in sight glass, flow rate markings) that provide real-time information about the nitrogen flow rate. This allows the operator to monitor and adjust the flow to maintain it within the optimal range, ensuring both oxide prevention and high-quality braze without creating pin holes.
3Device complexity
If nitrogen flow is not monitored, then device complexity is reduced, but incorrect flow rates cause oxide formation or pin holes
Solution Approach 1:
The patent implements feedback through visual indicators (float position in sight glass, flow rate markings) that provide real-time information about the nitrogen flow rate. This allows the operator to monitor and adjust the flow to maintain it within the optimal range, ensuring both oxide prevention and high-quality braze without creating pin holes.
Solution Approach 2:
The patent applies self-service through the automatic float mechanism that responds to flow rate changes. The float rises or falls with the gas flow, automatically indicating the flow rate status without requiring external measurement devices or complex monitoring systems.
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
Ensures proper purging and brazing by regulating nitrogen flow, preventing oxide formation and ensuring a high-quality braze, while providing a visual means to monitor and adjust the flow rate for optimal results.
Implementation Method 1
a floating member in the sight housing. In certain embodiments, the method includes flowing gas from the gas source to the gas flow regulator, the flowing gas causing the floating member in the sight housing to float in the housing, the position of the floating member in the sight housing corresponding to a gas flow rate
Data Source
AI summary
Flow regulator, system and method that allow regulation of gas flow, both during a purging operation such as to purge a line of oxygen, and during a brazing operation to maintain the line free or substantially free of oxygen during the brazing operation. The system includes a gas source, such as a nitrogen tank containing a source of nitrogen, a gas regulator in fluid communication with the gas source to regulate the delivery pressure from the gas source, and a flow regulator in fluid communication with the gas source to regulate the flow of gas during the purge and brazing operations. The flow regulator provides a visual indication that gas is flowing, and a visual indication of the particular flow rate of the flowing gas.