Centrifugal Fan Dust Discharge via Segmented Airflow
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Solution Overview
Problem
Dust accumulation in the centrifugal fan module of notebook computers reduces heat dissipation efficiency and increases noise due to reduced airflow and increased fan resistance.
Innovation Solution
A centrifugal fan module with a dust-discharging hole located in a strong airflow region, utilizing centrifugal force to actively discharge dust through the hole, preventing accumulation at the air outlet and maintaining airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the centrifugal fan module operates continuously to dissipate heat, then heat dissipation efficiency is maintained, but dust accumulates at the air outlet reducing airflow and increasing noise
Solution Approach 1:
The fan housing is segmented into multiple functional regions: a strong airflow region for heat dissipation, a weak airflow region for dust collection, and a dust-discharging hole for dust removal. This segmentation allows simultaneous achievement of effective heat dissipation and dust prevention by directing different airflows through different paths.
Solution Approach 2:
Different regions of the fan housing are designed with different airflow characteristics. The strong airflow region near the air outlet maintains high velocity for effective heat dissipation, while the weak airflow region near the impeller creates a dust-collecting zone. The dust-discharging hole is strategically positioned to exploit the pressure differential between regions.
2Productivity
If the fan housing is designed with a dust-discharging hole in the strong airflow region, then dust is actively discharged maintaining airflow efficiency, but the structural complexity increases
Solution Approach 1:
The dust discharge function is achieved passively by utilizing the existing centrifugal force and pressure differential generated by the impeller rotation. The dust-discharging hole is positioned in the strong airflow region where high pressure naturally exists, allowing dust to be discharged automatically without additional active components, motors, or control systems.
Solution Approach 2:
The dust-discharging hole serves multiple functions: it acts as a dust discharge pathway, a pressure equalization opening, and an airflow guidance feature. By positioning it in the strong airflow region, it simultaneously contributes to dust removal and maintains the overall airflow pattern needed for heat dissipation.
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 active dust discharge design effectively prevents dust accumulation, enhancing heat dissipation and reducing noise by maintaining airflow and fan efficiency over time.
Implementation Method 1
via the centrifugal force generated by the rotation of the impeller in the strong airflow region, the dust can be forced to throw to the dust-discharging flow channel outside the fan housing via the dust-discharging hole
Data Source
AI summary
A centrifugal fan module comprising a fan housing and an impeller is provided. The fan housing includes an air inlet and a sidewall. The sidewall is pivotally disposed in the fan housing to rotate in the rotational direction relative to the fan housing. A tongue portion is formed between the sidewall and the impeller, a pressurized region is formed from the tongue portion along the rotational direction to the air outlet, the pressurized region includes a strong airflow region and the dust-discharging hole is in the strong airflow region.