Vapor-Phase Heating Apparatus Uniformity Control
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Solution Overview
Problem
Existing vapor-phase heating methods face challenges in achieving uniform temperature rise and preventing component peeling during the heating of three-dimensional objects with high heat capacity, particularly when using hot air collision methods, as they often result in uneven heating performance and increased risk of component detachment due to rapid temperature rise.
Innovation Solution
A vapor-phase type heating method and apparatus that utilizes a circulation route for heated gas containing vaporized heat transfer fluid, where the heat transfer fluid is supplied as droplets, collected, and re-vaporized, maintaining a predetermined vapor concentration to control the temperature rise and ensure even heating distribution across the object's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hot air collision method is used to heat three-dimensional objects with high heat capacity, then the rate of temperature rise can be increased, but uneven heating performance occurs and components are likely to peel off from the board
Solution Approach 1:
The patent changes the physical state of the heat transfer medium from gas (hot air) to liquid (heat transfer fluid), which fundamentally alters the heat transfer mechanism. This parameter change enables controlled vaporization and condensation cycles that provide uniform heat distribution while maintaining appropriate heating rates, resolving the contradiction between heating speed and uniformity
Solution Approach 2:
The patent utilizes phase transitions of the heat transfer fluid (vaporization and condensation) as the core heating mechanism. The fluid vaporizes to absorb heat, then condenses on the object surface to release latent heat, creating a self-regulating heat transfer process that ensures uniform heating without excessive temperature gradients that would cause component peeling
2Productivity
If hot air collision is performed at high speed to increase heat-transfer coefficient, then the heating efficiency is improved, but components are likely to peel off due to excessive collision force
Solution Approach 1:
The patent introduces a heat transfer fluid as an intermediary substance between the heat source and the object. This intermediary undergoes phase transitions to transfer heat efficiently through latent heat of vaporization and condensation, achieving high heating efficiency without the mechanical collision forces that would damage component bonds
Solution Approach 2:
The patent replaces the mechanical collision of hot air with a thermal phase-change system. Instead of relying on kinetic energy of moving air molecules to transfer heat, the system uses latent heat transfer during vaporization and condensation, eliminating mechanical stress while maintaining high heating efficiency
3Manufacturing precision
If holding time is extended to ensure all portions reach desired temperature, then heating uniformity is improved, but energy waste increases due to excessive heating of already heated portions
Solution Approach 1:
The patent implements a feedback control system where temperature sensors monitor the object's temperature in real-time, and the control unit adjusts the heating power accordingly. This feedback mechanism ensures that heating stops when the desired temperature is reached, preventing energy waste while maintaining temperature uniformity across all portions
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 approach allows for efficient and uniform heating of three-dimensional objects by adjusting vapor concentration and temperature rise rates, reducing the risk of component peeling and achieving consistent heating performance across the object's surface, even in complex shapes.
Implementation Method 1
heating an object by using latent heat of vaporization of vapor from a heat transfer fluid
Implementation Method 2
vapor of a heat transfer fluid is supplied to a heating furnace and heating an object by using latent heat of vaporization of the supplied vapor
Implementation Method 3
the vapor comes into contact with the object and cools to liquefy, and latent heat of vaporization of the vapor is applied to the object through phase change
Data Source
AI summary
In a vapor-phase type heating method, an object is heated by a heated gas containing vapor in a heating furnace. The heat transfer fluid falling from a front surface of the object to a lower portion of the heating furnace is collected, after the vapor comes into contact with the object and cools to liquefy and latent heat of vaporization of the vapor is applied to the object through phase change. The heated gas obtained after heating the object is discharged from an inside of the heating furnace to the circulation route. In the circulation route, the heat transfer fluid is supplied as droplets to the discharged heated gas and is vaporized after heating, and the heated gas including the vapor is supplied to the heating furnace.