Variable Thickness Fan Blades Dispersing Noise Energy
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Solution Overview
Problem
Conventional heat dissipation fans generate a blade pass tone due to blades passing through a narrow space at a fixed frequency, leading to noise accumulation and resonance.
Innovation Solution
The heat dissipation fan features fan blades of varying thicknesses with ductility and flexibility, causing different deformation and passing frequencies, thereby dispersing noise energy across multiple frequencies to prevent resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fan blades are made with uniform thickness and fixed rotational speed, then the fan structure is simple and easy to manufacture, but blade pass tone noise accumulates at a fixed frequency causing resonance
Solution Approach 1:
The patent applies local quality by making each fan blade have a different thickness from its neighbors, while maintaining uniform thickness within each individual blade. This local variation in thickness causes each blade to deform differently during rotation, scattering the blade pass tone noise across multiple frequencies rather than accumulating at a single frequency, thereby reducing resonance while keeping the manufacturing process relatively simple.
2Object-generated harmful factors
If fan blades are made with different thicknesses, then blade pass tone noise is dispersed across multiple frequencies reducing resonance, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the thickness parameter of adjacent fan blades while keeping other parameters (such as blade length, width, and material) constant. This selective parameter variation achieves noise dispersion across multiple frequencies without requiring complex blade geometries or additional components, thus limiting the increase in manufacturing complexity.
3Object-generated harmful factors
If fan blades have ductility and flexibility to deform differently, then noise frequencies are varied and resonance is prevented, but the structural strength may be compromised
Solution Approach 1:
The patent applies local quality by creating slight variations in blade thickness at specific locations (making adjacent blades different from each other) while maintaining sufficient overall blade strength. The blades retain enough structural integrity to perform their heat dissipation function while having the local flexibility to deform differently during rotation, preventing noise accumulation without compromising overall blade strength.
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
This design effectively reduces noise by breaking down the blade pass tone into multiple frequencies, minimizing noise accumulation and enhancing operational quietness.
Implementation Method 1
the fan blades of different thicknesses have different amount of deformation that varies with thickness of the fan blade
Implementation Method 2
the blades pass through the narrow space at different frequencies, so that the blade pass tone may be cut into a plurality of fine noises of different frequencies
Data Source
AI summary
A heat dissipation fan suited for being assembled in an electronic device is provided. The heat dissipation fan includes a hub and a plurality of fan blades disposed at and surrounding the hub. The fan blade has ductility and flexibility, and any two fan blades next to each other are in different thickness.