Dimpled Heat Exchanger Tube Joints for Brazing Alignment
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Solution Overview
Problem
Heat exchanger tubes often experience over-bending during the manufacturing process, leading to gaps between the vertical legs and the U-shaped divider, which results in poor brazing and potential leaks due to the vertical portions not being properly aligned during the brazing process.
Innovation Solution
The heat exchanger tube design incorporates a plurality of dimples along the joint between the curved wall and the vertical leg, which increases the stiffness of the joint, ensuring the vertical legs remain upright and improving the brazing process by maintaining the vertical configuration, thereby preventing over-bending and enhancing the structural integrity of the tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the tube is bent into a curved shape during manufacturing, then the tube can be formed into the desired radiator configuration, but the vertical portions become over-bent and misaligned
Solution Approach 1:
Dimples are stamped into the vertical portions of the tube before the brazing process to pre-establish the correct alignment and prevent over-bending during manufacturing. This preliminary structural reinforcement ensures the tube maintains its intended geometry throughout subsequent processing steps.
Solution Approach 2:
Dimples are applied selectively only to the vertical portions of the tube that require alignment reinforcement, rather than uniformly across the entire tube. This localized modification provides precise control over the bending behavior at critical locations while leaving other areas unchanged.
2Shape
If the vertical portions are over-bent, then the tube can be formed into the curved shape, but gaps occur between the vertical legs and the U-shaped divider
Solution Approach 1:
The dimples are formed in advance to pre-establish the correct geometric relationship between vertical legs and the U-shaped divider, ensuring proper alignment before brazing occurs. This prevents gap formation at the joints during the manufacturing process.
Solution Approach 2:
The dimples modify the local structural parameters of the vertical portions by creating indentations that increase stiffness and alter the bending characteristics. This changes the tube's resistance to over-bending, maintaining proper joint alignment and strength.
3Ease of manufacture
If the vertical portions are not properly aligned, then manufacturing is simpler, but brazing quality deteriorates and leaks occur
Solution Approach 1:
Dimples are stamped into the vertical portions before brazing to pre-establish proper alignment. This preliminary structural reinforcement ensures that the tube maintains correct geometry throughout the brazing process, guaranteeing high-quality joints without requiring complex alignment procedures.
Solution Approach 2:
The dimples provide localized structural reinforcement at the vertical portions that require precise alignment for brazing, while leaving the rest of the tube fabrication process unchanged. This targeted approach maintains ease of manufacture for the overall process while ensuring high brazing quality at critical locations.
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 dimples enhance the stiffness of the joint, ensuring proper alignment and brazing, reducing the likelihood of leaks and improving the overall strength and reliability of the heat exchanger tube.
Implementation Method 1
A plurality of dimples is aligned along the joint... The plurality of dimples increases the stiffness of the joint
Data Source
AI summary
A heat exchanger tube includes a curved wall, a leg, and a joint. The leg extends orthogonal to an end of the curved wall. The joint connects the curved wall and leg. A plurality of dimples is aligned along the joint.