Self-Assembly Micro Fan Flexible Joints Blade Angle
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Solution Overview
Problem
Conventional self-assembly micro fans have limited air-driving efficiency due to restricted angles and crude combinations between blades and flexible joints, which are primarily flat and lack curvature or inclined inner edges.
Innovation Solution
The design incorporates flexible joints with link members and extension members that allow for thermal contraction and bending, enabling blades to form curved shapes and inclined inner edges, thereby increasing the angles between blades and the radial direction, enhancing air-driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a squared flexible joint is used to connect the blade and outer ring, then the structure is simple, but the angle between the blade and radial direction is limited
Solution Approach 1:
The flexible joint is divided into multiple segments: a link member connecting the blade to the outer ring, and an extension member extending from the link member to the blade surface. This segmentation allows each component to perform a specific function, enabling the blade to achieve larger angles while maintaining structural simplicity.
Solution Approach 2:
The flexible joint transitions from a two-dimensional squared structure to a three-dimensional configuration with the extension member protruding from the link member. This dimensional change provides additional degrees of freedom, allowing the blade to pivot at larger angles relative to the radial direction while the joint itself remains compact.
2Ease of manufacture
If a squared flexible joint with limited connection area is used, then the manufacturing process is simple, but the air-driving efficiency is limited
Solution Approach 1:
The flexible joint is segmented into a link member and an extension member that can be independently formed and then joined. This segmentation allows for simplified manufacturing of each component while the assembled structure provides enhanced blade lifting capability and larger operating angles, improving air-driving efficiency.
Solution Approach 2:
The extension member acts as an intermediary element between the link member and the blade surface. It provides an inclined connection that mediates the force transmission, enabling the blade to achieve larger angles and improved aerodynamic efficiency without complicating the overall manufacturing process.
3Device complexity
If the flexible joint connection area is limited, then the structure is simple, but the blade cannot achieve curvature or inclined inner edges
Solution Approach 1:
The extension member protrudes from the link member in a direction away from the outer ring, creating a three-dimensional configuration. This dimensional extension provides the geometric flexibility needed to form curved blades and inclined inner edges while keeping the joint configuration itself relatively simple.
Solution Approach 2:
The flexible joint is designed with dynamic capabilities through the extension member that can pivot and orient itself during the reflow process. This dynamic behavior allows the blade to achieve various curved shapes and inclined edges depending on the specific design requirements, while the joint structure remains manageable in 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 enhanced design improves air-driving efficiency by allowing for larger angles and more complex blade shapes, leading to increased airflow and improved manufacturing efficiency during the reflow process.
Implementation Method 1
the flexible joints 93 are performed with a reflow process in an oven and thus bent owing to thermal contraction
Data Source
AI summary
A self-assembly micro fan includes a body, a plurality of blades and flexible joints, with any one of the blades being connected to the body by one of the flexible joints while each flexible joint is regarded as a pivot to move the blade connected therewith to have an angle relative to a radial direction of the body. Besides, each of the flexible joints has plural link members or at least one link member and extension member to provide variable types of shape of the micro fans, so that the air driving efficiency of the self-assembly micro fan is improved.