Distribution Pipe Asymmetric Guiding Surface Alignment
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Solution Overview
Problem
Existing heat exchangers with distribution pipes face issues of refrigerant flow maldistribution due to improper alignment of holes, leading to inefficiencies and potential leakage, as there are no effective solutions to ensure correct directional installation of distribution pipes.
Innovation Solution
Incorporating a fitting portion with a brazing surface and a guiding surface on the distribution pipe that snugly fits into the refrigerant inlet of the end plate, featuring a recess and key recess design to ensure correct orientation and alignment, preventing misalignment and facilitating manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a distribution pipe with holes is used to distribute refrigerant to parallel channels, then refrigerant distribution can be controlled, but improper alignment of holes causes flow maldistribution and leakage
Solution Approach 1:
The distribution pipe incorporates an asymmetric guiding surface with a recess that corresponds to a protrusion on the end plate. This asymmetric geometric feature creates a unique fit orientation, ensuring the pipe can only be installed in the correct rotational position. This mechanical asymmetry guarantees proper alignment of the holes with the parallel channels, preventing both flow maldistribution and refrigerant leakage without requiring high-precision manufacturing tolerances.
2Ease of manufacture
If distribution pipes are installed without directional guidance, then installation is simpler, but correct orientation of holes cannot be ensured
Solution Approach 1:
The distribution pipe is equipped with a self-aligning guiding surface featuring a recess that mechanically interfaces with a corresponding protrusion on the end plate. This self-service mechanism automatically ensures correct orientation during installation without requiring external alignment tools or complex procedures. The installer simply needs to insert the pipe into the inlet; the geometric constraint of the recess-protrusion interface automatically orients the holes in the correct direction, combining installation simplicity with alignment accuracy.
3Manufacturing precision
If the distribution pipe inlet is made to fit snugly into the refrigerant inlet, then alignment is improved, but the pipe becomes harder to install
Solution Approach 1:
The guiding surface incorporates an asymmetric recess geometry that creates a snap-fit or guide-fit connection with the corresponding protrusion on the end plate. This asymmetric design provides precise alignment through the geometric constraint while maintaining installation simplicity - the pipe is inserted in one motion and the asymmetric features automatically engage in the correct orientation. The complexity is built into the geometry rather than the installation procedure, resolving the contradiction between precision and ease of installation.
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 alignment of the distribution pipe holes, preventing flow maldistribution and leakage, while allowing for efficient brazing and manufacturing, thereby enhancing the heat exchanger's efficiency and reliability.
Implementation Method 1
the fitting portion is provided with a brazing surface adapted to be brazed onto an end plate
Data Source
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AI summary
A distribution pipe (100) for a heat exchanger (300) comprising at least two parallel channels for a first medium exchanging heat with a second medium comprises a distribution portion (110) provided with a number of holes (120) provided on positions corresponding to the position of the parallel channels. A fitting portion (140) is in fluid communication with the distribution portion (110) and placed at one end of such distribution portion (110), wherein the fitting portion is provided with a brazing surface (150) adapted to be brazed onto an end plate (200) or a start plate (320).