Metal Fan Blades with Flap Wings for Noise Reduction
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Solution Overview
Problem
Conventional heat dissipation fans, particularly centrifugal fans, face challenges in enhancing heat dissipation efficiency due to material limitations of fan blades, which restrict thickness and increase noise when rotational speed is increased to improve airflow.
Innovation Solution
The design incorporates metal fan blades with flap wings, allowing an angle between the flap wing and the blade surface, reducing whirlpool formation and increasing airflow volume, thereby enhancing operational efficiency and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the rotational speed of the fan is increased to improve airflow volume, then the airflow volume increases, but the noise generation increases
Solution Approach 1:
The fan blade trailing edge is designed with a curved flap wing structure instead of a straight edge. This curvature modification optimizes the airflow pattern at the blade trailing edge, reducing turbulence and whirlpool formation. The curved geometry allows air to flow more smoothly, increasing airflow volume while minimizing the noise generated by turbulent flow, thereby resolving the contradiction between airflow volume and noise generation.
2Volume of moving object
If the thickness of plastic fan blades is reduced, then the distance between fan blades decreases, but the heat dissipation efficiency decreases
Solution Approach 1:
The patent transitions from plastic fan blades to metal fan blades. Metal materials provide superior mechanical strength and thermal conductivity compared to plastic. This material substitution allows the blades to be made thinner while maintaining structural integrity, thereby reducing the distance between adjacent blades and improving heat dissipation efficiency through enhanced thermal conduction, resolving the contradiction between blade thickness and heat dissipation efficiency.
3Quantity of substance
If metal fan blades with flap wings are used, then airflow volume increases and noise decreases, but manufacturing complexity increases
Solution Approach 1:
The flap wing structure is designed as a separate trailing edge component that can be attached to the main fan blade body. This segmentation allows for simplified manufacturing where the blade and flap wing can be produced independently using standard metal forming techniques, then assembled together. This approach reduces overall manufacturing complexity while still achieving the performance benefits of the curved trailing edge design for improved airflow and reduced noise.
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 configuration of metal fan blades with flap wings effectively reduces air disturbances, increases airflow volume, and lowers noise, improving heat dissipation performance without the need for increased rotational speed.
Implementation Method 1
each of the metal fan blades has a first end and a second end opposite to each other, wherein the first end is connected to the hub, the second end has at least one flap wing, and an angle is included between the flap wing and a surface of the metal fan blade
Implementation Method 2
the flap wings can effectively reduce a disturbance of the surrounding air due to the rotation of the fan blades, and can also reduce whirlpool formation while increasing the volume of airflow
Data Source
AI summary
A heat dissipation fan including a hub and a plurality of metal fan blades disposed all around the hub. Each of the metal fan blades has a first end and a second end opposite to each other, wherein the first end is connected to the hub, and the metal fan blade has a flap wing at the second end. An angle is included between the flap wing and a surface of the metal fan blade.