Composite Flat Heat Pipe Insulation Section Design
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Solution Overview
Problem
In thin handheld electronic devices, flat heat pipes often cause high temperatures on the shell surface due to heat accumulation, posing a risk to users when they touch the device.
Innovation Solution
A composite flat heat pipe structure with a metal shell, a sealed section dividing the chamber into two parts, an insulation section, and a heat conduction section with a capillary structure and working fluid, where the insulation section is attached to the heating element to prevent heat accumulation on the dissipating shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the evaporator portion is attached on the heating electronic components to transfer heat, then heat transfer capability is improved, but the shell surface temperature becomes too high causing user injury
Solution Approach 1:
The flat heat pipe is divided into three distinct sections: an evaporator section attached to the heating component, an insulation section in the middle, and a condenser section near the shell. This segmentation prevents direct heat transmission from the evaporator to the shell, allowing heat to be transferred away from the heating component without raising the shell temperature to harmful levels.
Solution Approach 2:
The insulation section acts as an intermediary between the evaporator and condenser portions. This intermediate section with insulating material blocks direct heat conduction to the shell, while still allowing the heat pipe to function as a heat transfer device by directing heat through the working fluid phase change process.
2Volume of moving object
If the flat heat pipe is used to transfer heat in thin handheld devices, then space occupation is reduced, but heat accumulation on the shell occurs
Solution Approach 1:
Different sections of the flat heat pipe have different thermal properties: the evaporator section has high heat absorption capability, the insulation section has low thermal conductivity to prevent heat leakage to the shell, and the condenser section facilitates heat release. This local differentiation of thermal properties allows efficient heat transfer while preventing heat accumulation on the shell.
3Ease of manufacture
If the metal shell is rolled to form the sealed section, then manufacturing simplicity is improved, but heat insulation between sections becomes challenging
Solution Approach 1:
The heat pipe employs composite construction with different materials in different sections: metal sections for heat conduction (evaporator and condenser) and insulating material in the middle section. This composite approach maintains manufacturing simplicity through the rolled metal shell structure while achieving effective heat insulation between the evaporator and condenser portions.
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 effectively redirects heat away from the dissipating shell, maintaining it at a lower temperature, thus preventing user injury from high temperatures.
Implementation Method 1
a capillary structure disposed in an inner wall of the second chamber and a working fluid filled in the second chamber
Implementation Method 2
the working fluid inside the evaporator portion will be vaporized rapidly and flew to the condenser portion at a low temperature for releasing heat
Implementation Method 3
The insulation section is located in one side of the sealed section of the tube, and the insulation section is a hollow chamber including the first chamber
Data Source
AI summary
A flat heat pipe includes a tube, a sealed section, an insulation section and a heat conduction section. The tube includes a metal shell and a chamber. The sealed section is formed by rolling the metal shell and making two opposite inner walls of the tube combined closely on the tube that separate the chamber into a first chamber and a second chamber. The insulation section is a hollow chamber including the first chamber. The conduction section includes the second chamber, a capillary and working fluid. Further, the heat conduction device includes a heat dissipating shell, a heating element and a flat heat pipe. The plate heat pipe is disposed in the heat dissipating shell and thermally conducted with the heating element.