Heat Exchanger Collecting Pipe Arc Transition Stress Reduction
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Solution Overview
Problem
Existing heat exchangers in refrigeration systems suffer from stress concentration and fatigue fracture due to variable loads, which affects their service life.
Innovation Solution
The heat exchanger design includes a collecting pipe with sequentially stacked and connected pipe units, each with a first section of smaller diameter, a second section of larger diameter, and an arc-shaped section between them, allowing for expansion and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pipe units are directly connected with rigid joints, then structural strength is improved, but stress concentration occurs under variable loads leading to fatigue fracture
Solution Approach 1:
The patent introduces an arc-shaped section between the first and second sections of each pipe unit. This curved transition replaces rigid angular connections, distributing stress more evenly and eliminating stress concentration points that would lead to fatigue fracture under variable loads.
Solution Approach 2:
The patent varies the diameter along the pipe unit length, creating a first section with smaller diameter and a second section with larger diameter. This parameter change allows for expansion allowance during brazing while maintaining structural integrity, and the gradual transition reduces stress concentration.
2Productivity
If pipe units are stacked and connected with insertion, then synchronous sinking during welding is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the collecting pipe into multiple pipe units, each consisting of a first section and a second section. This segmentation allows each unit to be manufactured separately and then stacked and connected through insertion, enabling synchronous sinking during brazing while maintaining manufacturing feasibility through modular construction.
Solution Approach 2:
The first section of each pipe unit is designed to be inserted into the second section of adjacent pipe units, creating a nested configuration. This nesting structure facilitates synchronous sinking during welding/brazing while the modular nature keeps manufacturing complexity manageable.
Data Source
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AI summary
The present invention provides a heat exchanger (100) and a refrigeration system (1000). The heat exchanger (100) includes a collecting pipe (10), and the collecting pipe (10) includes a plurality of pipe units (13). The plurality of pipe units (13) are sequentially stacked and connected, and each of the plurality of pipe units (13) includes a first section (131) and a second section (132). A diameter of the first section (131) is less than that of the second section (132), such that the first section (131) of one of adjacent two of the plurality of pipe units (13) is capable of inserting into the second section (132) of the other of adjacent two of the plurality of pipe units (13). An arc-shaped section (133) is provided between the first section (131) and the second section (132) of each of the plurality of pipe units (13), and the arc-shaped section (133) extends to a top of the second section (132) from a bottom of the first section (131), so that the first section (131) is connected to the second section (132).