Fan Wheel Axial Blade Extension and Rounded Edges
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Solution Overview
Problem
Conventional fans in electronic products face a trade-off between increasing airflow rate and reducing noise, as higher rotation speeds lead to noise disturbances due to reduced blade pitch, while lower speeds result in inadequate cooling efficiency for dense electronic components.
Innovation Solution
A fan design with a fan wheel featuring broader blades that extend beyond the hub and fan cowl, reducing the number of blades and incorporating rounded peripheries and connection portions to minimize air flow disturbance and noise, allowing operation at lower speeds with enhanced airflow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the fan wheel is increased to improve airflow rate and heat dissipation efficiency, then the airflow rate increases, but the noise increases due to reduced blade pitch causing air flow disturbance
Solution Approach 1:
The patent extends the blades in the axial direction beyond the hub and fan cowl, adding a new dimensional element to the blade configuration. This axial extension increases the effective blade area and improves airflow generation without requiring higher rotational speeds, thereby resolving the contradiction between airflow rate and noise
Solution Approach 2:
The patent incorporates rounded peripheries on the blades and rounded connection portions where the blades meet the hub. This curvature design reduces air flow disturbance and turbulence, thereby reducing noise generation while maintaining effective airflow, addressing the noise issue without sacrificing cooling efficiency
2Productivity
If the number of blades is increased to maintain efficiency with narrower blade width, then the blade count increases, but the pitch between blades is reduced causing air flow disturbance and noise
Solution Approach 1:
Instead of increasing blade count in the radial direction, the patent extends blades in the axial direction beyond the hub and fan cowl. This dimensional change increases the effective blade area and pitch, reducing air flow disturbance while maintaining or improving airflow efficiency
Solution Approach 2:
The patent changes the geometric parameters of the blades by extending their axial length and rounding their peripheries. These parameter changes improve the blades' ability to move air efficiently while reducing turbulence and noise, resolving the contradiction between airflow efficiency and air flow disturbance
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 increases airflow rate and static pressure while reducing noise and production costs, providing effective heat dissipation without the need for high rotational speeds, thus addressing the limitations of conventional fans.
Implementation Method 1
The flow conducting portion is rounded to extend downwards from the top wall to the central hole to enhance the air flow
Implementation Method 2
a fan is disposed in an electronic product so that air flow produced by the rotating fan can force convection to cool the electronic components
Data Source
AI summary
A fan and a fan wheel thereof are provided. The fan comprises the fan wheel and a fan cowl. The fan wheel comprises a hub and a plurality of blades. The hub can define an axial direction and a radial direction, and each of the blades has an axial length and a radial length. The portion of each of the blades that extends along the axial direction over a top edge of a side wall of the hub accounts for the axial length in a ratio between one third and two thirds. A connection portion connecting a central portion to the side wall of the hub, and a tip and a tail of each of the blades, as well as a flow conducting portion connecting a top wall to a central hole of the fan cowl, are all rounded. Thereby, the fan and the fan wheel thereof can strengthen the flow rate and reduce the noise generated by the fan.