Heat Exchanger Adhesive Bonding for Bubble-Free Component Joining
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Solution Overview
Problem
The existing methods for manufacturing heat exchangers, particularly those using soldering, are resource-intensive, costly, and have limitations in connecting different materials due to health hazards from fluxes, uneven thermal expansion compensation, and corrosion issues, while adhesive bonding methods lack process reliability and flexibility.
Innovation Solution
A method involving the application of an adhesive layer as a film or granules to heat exchanger components, using pressure rollers and heating to ensure a continuous, bubble-free, and flexible coating process, adaptable to various geometries and materials, with optional visual inspection for quality assurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering is used to connect heat exchanger components, then the components can be reliably joined, but the process becomes resource-intensive, costly, and harmful to health due to fluxes
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary substance between the heat exchanger components, replacing the soldering process. This adhesive mediator achieves reliable bonding without requiring harmful fluxes, thus resolving the contradiction between connection reliability and health hazards. The adhesive serves as a safe alternative that maintains joint strength while eliminating toxic fumes and residues associated with traditional soldering fluxes.
2Adaptability or versatility
If soldering is used to connect different materials, then materials can be joined, but thermal expansion compensation is limited and corrosion issues arise from potential differences
Solution Approach 1:
The patent changes the bonding mechanism from metallurgical (soldering) to adhesive bonding, allowing the adhesive layer to accommodate different thermal expansion coefficients between dissimilar materials. The adhesive's viscoelastic properties enable it to absorb thermal stresses that would otherwise cause failure in soldered joints, thereby improving reliability when connecting different materials with varying thermal expansion characteristics.
3Object-affected harmful factors
If adhesive bonding is used instead of soldering, then health hazards are eliminated, but process reliability and application quality are insufficient
Solution Approach 1:
The patent applies preliminary surface preparation steps including cleaning and activation treatments to the heat exchanger components before adhesive application. This preliminary action ensures optimal surface energy and adhesion properties, which are critical for achieving reliable adhesive bonding. By preparing the surfaces in advance, the process eliminates the need for harmful fluxes while maintaining high bonding reliability through controlled surface conditions.
Solution Approach 2:
The patent replaces the thermal-metallurgical soldering process with a controlled adhesive application system using precision dosing equipment. This mechanical substitution allows for precise control of adhesive placement, thickness, and distribution, thereby achieving process reliability comparable to or exceeding traditional soldering while eliminating health hazards associated with fluxes and high-temperature heating.
4Ease of manufacture
If traditional adhesive application methods are used, then bonding can be achieved, but the process lacks flexibility and cannot easily adapt to different requirements
Solution Approach 1:
The patent implements a dynamic adhesive application system where parameters such as adhesive dose, application pattern, and curing conditions can be adjusted in real-time based on the specific component geometry and bonding requirements. This dynamic control enables the same equipment to handle various heat exchanger designs and material combinations, providing both ease of manufacture and high adaptability to different production requirements.
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 method enables a process-reliable, cost-effective, and high-quality adhesive bonding of heat exchanger components, reducing defects and ensuring uniformity, thus overcoming the limitations of soldering and improving manufacturing efficiency and flexibility.
Implementation Method 1
the adhesive film and the pipe to be coated are fed through an oven and heated in the process, with the adhesive film being shrunk onto the pipe to be coated
Implementation Method 2
The adhesive film is then heated and applied to the web to be coated, with the adhesive film and the web to be coated being guided by pressure rollers and pressed against one another in the process
Data Source
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AI summary
The invention relates to a method for producing a heat exchanger having at least two components (2, 11) which are adhered together. It is essential to the invention that, on an outer side, at least one of the components (2, 11) is applied to the adhesive layer (1).