Vapor Chamber Wick Sheet Structure for Thin Heat Dissipation
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Solution Overview
Problem
Existing heat dissipating members, such as heat pipes, are bulky and hinder the reduction in thickness of mobile terminals, and there is a need for thinner alternatives that can efficiently circulate a working fluid for effective heat dissipation.
Innovation Solution
A wick sheet for vapor chambers with a specific design featuring land sections, bridges, and liquid flow channels that facilitate the circulation of a working fluid while minimizing deformation, allowing for thinner designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat pipes are used for heat dissipation, then heat dissipation function is achieved, but thickness is increased
Solution Approach 1:
The vapor chamber utilizes phase transitions of the working fluid between liquid and vapor states to achieve heat dissipation. The working fluid evaporates at the heating surface, absorbs latent heat, and condenses at the cooling surface, releasing heat. This phase change mechanism enables effective heat transfer in a thin-profile structure without requiring the bulky construction of traditional heat pipes.
Solution Approach 2:
The wick sheet incorporates a porous structure with capillary channels that enable the working fluid to be transported from the condensation area back to the evaporation area through capillary action. The porous material provides sufficient surface area and capillary forces to sustain continuous fluid circulation, enabling effective heat dissipation in a compact, thin design.
2Length of moving object
If the wick sheet thickness is reduced for thinner vapor chambers, then the overall device thickness is reduced, but the wick sheet may deform
Solution Approach 1:
The wick sheet is designed as a thin, flexible structure with optimized porosity and mechanical properties. The thin film construction reduces overall thickness while maintaining sufficient structural integrity through careful material selection and structural design that prevents deformation during assembly and operation.
Solution Approach 2:
The vapor chamber employs a composite structure combining the wick sheet with support elements and sealing layers. This composite construction provides mechanical support to the thin wick sheet, preventing deformation while maintaining the thin-profile advantage. The combination of materials with different mechanical properties ensures both flexibility and structural stability.
3Length of moving object
If the wick sheet deforms, then manufacturing and assembly become difficult, but reducing thickness is desired
Solution Approach 1:
The wick sheet undergoes preliminary shaping and pre-assembly procedures before final installation in the vapor chamber. This preliminary action ensures that the thin wick sheet is properly positioned and shaped in advance, preventing deformation during subsequent assembly steps and ensuring manufacturing precision.
Solution Approach 2:
Adhesive layers or bonding agents are used as intermediaries between the thin wick sheet and the vapor chamber structure. These intermediary materials provide mechanical support and positioning for the thin wick sheet during assembly, preventing deformation while enabling secure attachment to the vapor chamber housing.
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 wick sheet enhances heat dissipation efficiency by suppressing deformation and facilitating fluid circulation within the vapor chamber, contributing to thinner and more effective heat management in electronic devices.
Implementation Method 1
The working fluid in the vapor chamber evaporates in an area (evaporation area) near the device by receiving heat from the device, so as to turn into a vapor (working vapor)
Implementation Method 2
The working vapor is cooled by diffusing away from the evaporation area within a vapor flow channel section, so as to condense into a liquid
Implementation Method 3
The vapor chamber is provided with a liquid flow channel section serving as a capillary (wicking) structure. The working fluid (working liquid) that has turned into a liquid by condensation enters the liquid flow channel section from the vapor flow channel section, and is transported toward the evaporation area by flowing through the liquid flow channel section
Implementation Method 4
A vapor chamber according to this embodiment has a working fluid enclosed therein... The working fluid absorbs and diffuses heat from a device, thereby cooling the device
Data Source
AI summary
A wick sheet for a vapor chamber includes a first main body surface, a second main body surface located opposite the first main body surface, a frame body section, and a plurality of land sections apart from each other within the frame body section. A vapor path through which a vapor of a working fluid travels is between the plurality of land sections. A liquid flow channel section that communicates with the vapor path and through which the working fluid in a liquid form travels is at the second main body surface side of at least one of the land sections. A bridge that couples the land sections to the frame body section or that couples the land sections to each other is included. The bridge is reduced in thickness from at least one of the first main body surface side and the second main body surface side.