Heat Dissipation Unit Laser Capillary Mesh Backflow
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Solution Overview
Problem
Conventional vapor chambers and flat-plate heat pipes with channeled capillary structures face challenges in liquid working fluid backflow efficiency due to gravity, especially when not horizontally placed, limiting their ability to maintain water content and vapor-liquid circulation.
Innovation Solution
A heat dissipation unit comprising a main body with laser-processed capillary channels on one face of a lower plate and a mesh body attached to enhance capillary attraction, made from materials like titanium, copper, or aluminum, to improve liquid working fluid backflow efficiency and increase water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If channeled capillary structures are used in vapor chambers or flat-plate heat pipes, then the structure is simpler and manufacturing is easier, but the liquid working fluid backflow efficiency deteriorates when not horizontally placed due to gravity
Solution Approach 1:
The patent merges two different capillary structure types: channeled structures (formed by laser processing on the lower plate) and mesh bodies (attached to the channeled structure). This combination allows the system to maintain the manufacturing simplicity of channeled structures while adding the gravity-independent capillary action of mesh bodies, thereby resolving the contradiction between ease of manufacture and backflow efficiency.
Solution Approach 2:
The patent creates a composite capillary structure by combining channeled structures (made from the base material like copper or aluminum) with mesh bodies (made from materials such as stainless steel or nickel mesh). This composite approach leverages the advantages of both structures: the simplicity and thermal conductivity of the base material channels and the superior capillary action of the mesh body, thus improving backflow efficiency without significantly complicating manufacturing.
2Reliability
If sintered powders or mesh bodies are used as capillary structures, then capillary attraction is enhanced for better liquid backflow, but the structure complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the capillary structure into two distinct functional components: channeled structures that provide the basic fluid pathway and structural support, and mesh bodies that provide enhanced capillary attraction. This segmentation allows each component to be optimized independently and simplifies the overall manufacturing process compared to creating a single complex sintered powder structure with equivalent performance.
3Ease of manufacture
If channeled capillary structures are used, then manufacturing is simpler, but the water content and vapor-liquid circulation efficiency decrease
Solution Approach 1:
By merging channeled structures with mesh bodies, the patent creates a hybrid capillary system that maintains the manufacturing simplicity of laser-formed channels while adding the mesh body's ability to hold and transport larger amounts of working fluid through enhanced capillary action, thus increasing water content without significantly increasing manufacturing complexity.
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 combination of capillary channels and mesh bodies significantly enhances capillary attraction, improving the backflow efficiency and vapor-liquid circulation within the heat dissipation unit, effectively addressing the limitations of channeled structures under gravitational conditions.
Implementation Method 1
The capillary structures serve to provide capillary attraction to absorb and make the working fluid flow back
Data Source
AI summary
A heat dissipation unit includes a main body and a mesh body. The main body has an upper plate and a lower plate. The upper and lower plates are correspondingly overlapped and mated with each other to together define an airtight chamber. A working fluid is contained in the airtight chamber. One face of the lower plate, which faces the airtight chamber, is formed with a capillary structure by means of laser processing. The mesh body is attached to the face of the lower plate with the capillary structure. By means of the mesh body, the liquid working fluid backflow efficiency of the capillary structure can be enhanced and the water content of the internal evaporation section of the heat dissipation unit can be increased to avoid dry burn.