Vehicle Heat Exchanger Brazing with Uniform Panel Compression
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Solution Overview
Problem
In the manufacturing of vehicle heat exchangers, the use of flux in brazing leads to electrical conductivity issues and durability problems due to flux elution when coolant flows through the panels, causing safety and durability concerns for fuel cell systems.
Innovation Solution
A vacuum-brazing method is employed with elastic bodies and support pins to apply uniform loads and prevent deformation, eliminating the need for flux by using symmetrically arranged elastic portions and honeycomb support pins to maintain bonding quality and prevent peeling of separation plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flux is applied to prevent magnesium oxidation during brazing, then bonding quality is improved, but electrical conductivity of coolant increases due to flux elution
Solution Approach 1:
The harmful flux material is completely removed from the brazing process by adopting fluxless vacuum brazing technology. This extraction of the problematic substance eliminates the source of electrical conductivity issues while maintaining bonding quality through alternative brazing methods in a vacuum environment.
Solution Approach 2:
A vacuum environment is created during brazing to replace the atmospheric conditions that require flux protection. The vacuum atmosphere prevents oxidation of magnesium without introducing harmful flux materials, thus resolving the contradiction between bonding quality and coolant electrical conductivity.
2Manufacturing precision
If uniform load is applied to cooling panel module during brazing, then deformation is prevented, but additional supporting structures are required
Solution Approach 1:
Elastic bodies are positioned at multiple locations on the cooling panel module to distribute the supporting load uniformly across the structure. This creates an equipotential support system where each point bears equal stress, preventing deformation without requiring complex localized support structures.
Solution Approach 2:
The supporting structures utilize elastic materials that change their mechanical properties under heat. The elastic bodies are selected to have appropriate elastic moduli that allow them to maintain uniform load distribution during the thermal brazing process, simplifying the overall support system design.
3Manufacturing precision
If elastic bodies are used to apply uniform load, then load distribution is improved, but device complexity increases
Solution Approach 1:
Multiple identical elastic bodies are used throughout the cooling panel module to ensure homogeneous load distribution. Each elastic body has the same dimensions, material properties, and positioning, creating a uniform support system that simplifies design while achieving precise load distribution.
Solution Approach 2:
The elastic body design is replicated at multiple locations on the cooling panel module. By copying the same simple elastic component design throughout the structure, uniform load distribution is achieved without increasing device complexity, as each location uses the identical standardized element.
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 ensures even load distribution, prevents deformation and peeling, and maintains bonding quality without flux, enhancing electrical safety and durability of fuel cell systems while reducing costs and complexity.
Implementation Method 1
at least one pair of elastic portions that are provided between the top or bottom end of the cooling panel module and the fixing portion, and are arranged symmetrically based on a top or bottom surface of the cooling panel module to compress the cooling panel module
Implementation Method 2
a plurality of cooling panels are bonded to each other by pressing a cooling panel module where the plurality of cooling panels are stacked vertically
Implementation Method 3
utilizes a vacuum-brazing method
Data Source
AI summary
An apparatus for manufacturing a heat exchanger for a vehicle has a plurality of cooling panels bonded to each other by pressing a cooling panel module where the plurality of cooling panels are stacked vertically, including: a fixing portion for supporting top and bottom ends of the cooling panel module; and a pair of elastic portions that are provided between the top or bottom end of the cooling panel module and the fixing portion, and are arranged symmetrically based on a top or bottom surface of the cooling panel module to compress the cooling panel module.