Heat Pipe Injection Port Structure for Thin-Pipe Fluid Filling
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Solution Overview
Problem
The challenge of injecting a working fluid into a thin heat pipe is exacerbated by the reduction in size of the injection port, making it difficult to fill the heat pipe effectively.
Innovation Solution
A heat pipe design featuring a multi-layered injection port with grooved inner surfaces that generate capillary forces to facilitate easy fluid injection, comprising a first and second outer metal layer with an inner metal layer, and an injection passage demarcated by these layers, allowing for stable fluid flow and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the heat pipe is made thin to meet electronic device thinning requirements, then the heat pipe thickness is reduced, but the injection port becomes small making it difficult to inject the working fluid
Solution Approach 1:
The injection port inner surface is formed with a porous layer having porous structures with controlled pore diameters (1μm to 100μm). These porous structures generate capillary pressure to draw the working fluid into the heat pipe, enabling effective injection even when the injection port is small due to thin heat pipe dimensions.
Solution Approach 2:
The invention changes the physical parameters of the injection port by controlling the pore diameter of the porous layer within a specific range (1μm to 100μm). This parameter control optimizes the capillary pressure to balance between drawing the working fluid effectively and preventing excessive back pressure that would hinder injection.
2Volume of moving object
If the injection port is made small to reduce heat pipe size, then the heat pipe dimensions are reduced, but it becomes difficult to fill the heat pipe with working fluid effectively
Solution Approach 1:
The porous layer in the injection port creates capillary forces that actively draw the working fluid into the heat pipe, ensuring effective filling even when the heat pipe volume is small. The controlled pore structures prevent air entrapment and facilitate complete filling of the working fluid.
Solution Approach 2:
The invention replaces mechanical injection methods with capillary action generated by the porous structures. This substitution eliminates the need for high-pressure injection mechanisms, making the system more suitable for small-volume heat pipes where mechanical injection would be difficult.
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 design enables easy and stable injection of the working fluid into the heat pipe, even when the port is narrowed, ensuring effective heat transfer and cooling performance.
Implementation Method 1
The first inner surface of the first outer metal layer has at least one first groove portion
Data Source
AI summary
The heat pipe includes an injection port into which a working fluid is injected. The injection port has a first outer metal layer, a second outer metal layer, at least one inner metal layer provided between the first outer metal layer and the second outer metal layer, and an injection passage in which the injected working fluid moves, the injection passage demarcated by the first outer metal layer, the second outer metal layer, and the inner metal layer. The first outer metal layer has a first inner surface facing the second outer metal layer and constituting a first inner surface of the injection passage. The first inner surface of the first outer metal layer has at least one first groove portion.