Alternating Upper Lower Blades Impeller Noise Reduction
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Solution Overview
Problem
Conventional impellers generate unpleasant noise due to turbulence airflow when rotational speed is increased for enhanced heat dissipation, leading to a trade-off between noise and efficiency.
Innovation Solution
The impeller features alternately disposed upper and lower blades that extend outward from the hub, inhibiting turbulence and reducing noise through a specific arrangement that maintains a fixed height and curvature, allowing for reduced noise levels at high rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the impeller is increased to enhance heat dissipation efficiency, then the heat dissipation efficiency is improved, but the noise produced by the fan becomes louder due to turbulence airflow
Solution Approach 1:
The impeller blades are segmented into two distinct groups: upper blades extending from the upper surface of the hub, and lower blades extending from the lower surface of the hub. This segmentation allows each blade type to be optimally positioned to reduce turbulence, with upper blades having a first curvature and lower blades having a second curvature, thereby addressing the noise issue while maintaining heat dissipation efficiency
Solution Approach 2:
Different blade configurations are applied to different locations of the impeller. The upper blades have a first curvature optimized for their position, while the lower blades have a second curvature optimized for their position. This local quality approach ensures that each blade is designed specifically to minimize turbulence airflow in its respective location, reducing noise without compromising overall heat dissipation performance
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 achieves a noise reduction of 3-5 dB at high speed rotations, balancing heat dissipation efficiency with noise reduction.
Implementation Method 1
turbulence airflow occurring between the blades is inhibited
Data Source
AI summary
An impeller is provided. The impeller includes a hub, a plurality of upper blades, and a plurality of lower blades. The hub has an upper surface and a lower surface. The upper blades are disposed around the hub and connect to the upper surface. The lower blades are disposed around the hub and connect to the lower surface. The upper and lower blades are alternately disposed and outwardly extend from the hub.