Fan Module Blade Geometry for Noise Reduction
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Solution Overview
Problem
Conventional fan modules generate undesirable noise due to pressure variations and fluctuations at the blade edges, which are exacerbated by system barriers, leading to increased blade-passing frequency and broadband noise.
Innovation Solution
The fan module design features a hub with blades where the ratio of the second axial direction distance to the first axial direction distance between specific points on the blades is optimized to 0.4 to 0.5, creating an inflow field buffer zone that reduces pressure variations and noise by minimizing pressure fluctuations at the blade edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan operates at higher rotational speeds to improve heat dissipation efficiency, then the heat dissipation performance is improved, but noise increases due to pressure variations and fluctuations at the blade edges
Solution Approach 1:
The patent applies local quality by optimizing the geometric parameters of the blade first end specifically, rather than changing the entire blade structure. The axial direction distances and their ratio at the blade first end are precisely controlled to create a buffer zone that locally mitigates pressure fluctuations, thereby reducing noise while maintaining overall fan performance and heat dissipation efficiency.
2Ease of manufacture
If conventional blade designs are used to maintain simple structure, then manufacturing is easier, but noise increases due to pressure variations at the blade edges
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the blade first end, specifically the axial direction distances and their ratio. This quantitative parameter optimization creates an inflow field buffer zone that reduces pressure fluctuations and noise, while maintaining the overall simplicity of the blade structure and ease of manufacturing.
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 levels by 2 to 2.5 dB(A) compared to other configurations, resulting in a low-noise operation for the fan module and the electronic devices it is integrated into.
Implementation Method 1
A pressure variation may be caused and a fluctuation at the front edge may thus be caused, resulting in undesirable noise
Implementation Method 2
the airflow is drawn into the fan from a fan inlet along a direction parallel to a central axis of a hub of the fan
Data Source
AI summary
A fan module and an electronic device are provided. The fan module includes a hub and a plurality of blades. The blades are mounted around the hub, and each of the blades has a first end that is connected to a periphery of the hub and a second end that is relatively away from the hub. A first axial direction distance in the axial direction is provided between a first point of the first end that is relatively away from the top surface and the top surface. A second axial direction distance in the axial direction is provided between a second point of the first end that is near the top surface and the top surface. A ratio of the second axial direction distance to the first axial direction distance is 0.4 to 0.5.