Loop Heat Pipe Evaporator One-Piece DMLS Fabrication
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Solution Overview
Problem
The manufacturing process of loop heat pipes (LHPs) is cumbersome, labor-intensive, and has a low yield rate due to the complexity of producing the capillary pump assembly, particularly the primary wick and its integration with the envelope, which affects the thermal performance and reliability of the system.
Innovation Solution
The use of Direct Metal Laser Sintering (DMLS) or 3D printing allows for the fabrication of LHP evaporators as a single part or one-piece construction, integrating the primary wick and envelope, eliminating the need for machining vapor grooves and reducing the risk of damage during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing techniques are used to produce the capillary pump assembly with separate primary wick and envelope, then the manufacturing process is cumbersome and labor-intensive, but the thermal contact between wick and envelope is insufficient
Solution Approach 1:
The patent merges the primary wick and envelope into a single integrated component manufactured via DMLS. The porous wick structure and solid envelope are created as one piece, eliminating the need for separate manufacturing and assembly processes. This integration ensures perfect thermal contact between the wick and envelope while simplifying the manufacturing process to a single additive printing operation.
2Reliability
If conventional manufacturing techniques are used with separate wick and envelope components, then assembly is required, but this increases the risk of damage during assembly and reduces yield rate
Solution Approach 1:
By combining the wick and envelope into a single DMLS-manufactured component, the patent eliminates assembly operations that cause damage and reduce yield. The integrated design removes interfaces where misalignment or damage could occur during assembly, thereby improving reliability and increasing production yield.
3Ease of manufacture
If conventional manufacturing uses separate components requiring machining of vapor grooves, then additional manufacturing steps are required, but this increases manufacturing time and complexity
Solution Approach 1:
The DMLS manufacturing process creates the vapor grooves and all other features directly during the additive printing process itself, before any post-processing or assembly is needed. This preliminary formation of all required features during manufacturing eliminates subsequent machining operations and reduces total manufacturing cycle time.
4Device complexity
If conventional LHP design uses bimetallic joints and knife-edge seals, then assembly complexity increases, but these components are required for sealing and thermal management
Solution Approach 1:
The integrated DMLS-manufactured wick-envelope component eliminates the need for separate bimetallic joints and knife-edge seals. The single-piece construction provides inherent sealing through its continuous structure, removing multiple discrete sealing components and their associated assembly complexity while maintaining or improving sealing integrity.
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 simplifies the manufacturing process, improves thermal contact between the wick and envelope, reduces material waste, and enhances the reliability and thermal performance of LHPs by eliminating the need for bimetallic joints and knife-edge seals.
Implementation Method 1
The use of Direct Metal Laser Sintering (DMLS) or 3D printing allows for the fabrication of LHP evaporators as a single part or one-piece construction
Implementation Method 2
Heat 11 enters an evaporator 12 and vaporizes a working fluid at an outer surface of wick 14
Implementation Method 3
Heat 11 enters an evaporator 12 and vaporizes a working fluid at an outer surface of wick 14
Implementation Method 4
Capillary forces accomplish this passively, drawing liquid back to the surface, just as water will be drawn up into a sponge
Data Source
AI summary
A loop heat pipe evaporator includes a porous primary wick, and a nonporous envelope unseparatingly surrounding the primary wick. The primary wick and the envelope are of one-piece construction.