Centrifugal Fan Isolating Structure for Airflow Volume
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Solution Overview
Problem
The miniaturization trend of electronic devices limits the configuration space and efficiency of fans used for heat dissipation, making it challenging to effectively cool electronic components like CPUs and GPUs.
Innovation Solution
A centrifugal fan design featuring a casing with a side wall structure and isolating structure that creates separate airspaces and airflow channels, enhancing airflow volume and reducing resistance through a fan impeller with adjustable air inlets and outlets, and a rotatable fan hub with blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fan size is reduced to accommodate miniaturization trends, then the configuration space is reduced, but the heat dissipation efficiency deteriorates
Solution Approach 1:
The air inlet is divided into multiple independent channels (first air inlet channel, second air inlet channel, third air inlet channel) that are spatially separated and independently configured. This segmentation allows each channel to be optimized for specific airflow paths, improving overall heat dissipation efficiency while maintaining a compact fan structure
Solution Approach 2:
The patent introduces a vertical dimension to airflow management by configuring air inlets at different heights (first air inlet channel at upper side, second and third air inlet channels at lower side) and using a isolating structure with through hole to create multi-level airflow paths. This three-dimensional airflow configuration maximizes heat dissipation within limited horizontal space
2Volume of moving object
If the fan size is reduced to accommodate miniaturization trends, then the configuration space is reduced, but the airflow volume deteriorates
Solution Approach 1:
The isolating structure is nested within the casing and extends vertically to divide the air outlet into multiple channels. This nested configuration allows multiple airflow paths to be packed into the limited fan volume, increasing total airflow capacity without increasing overall fan size
Solution Approach 2:
The isolating structure utilizes the vertical dimension by extending from the first cover toward the second cover, creating multiple vertically-stacked airflow channels. This vertical arrangement of airflow paths significantly increases the air outlet capacity within the constrained horizontal space of the miniaturized fan
3Volume of moving object
If the fan size is reduced to accommodate miniaturization trends, then the configuration space is reduced, but the airflow resistance increases
Solution Approach 1:
Each air inlet channel is equipped with dedicated guiding structures (first guiding structure, second guiding structure, third guiding structure) that are locally optimized to guide airflow smoothly into the fan inlet. This local optimization of airflow guidance in each channel reduces turbulence and resistance, compensating for the reduced overall fan size
Solution Approach 2:
The guiding structures are positioned to pre-condition the airflow before it enters the fan impeller, smoothing and directing the airflow in advance. This preliminary airflow conditioning reduces resistance and improves airflow efficiency within the compact fan configuration
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
Improves airflow volume and efficiency, reducing airflow resistance and enhancing heat dissipation capabilities in compact electronic device configurations.
Implementation Method 1
centrifugal fan comprises a casing and a fan impeller... The fan impeller is disposed between the isolating structure and the first cover
Data Source
AI summary
A centrifugal fan comprises a casing and a fan impeller. The casing comprises a first cover, a second cover, a side wall structure and a isolating structure. The side wall structure is connected between the first cover and the second cover to form an accommodating space. The side wall structure includes a first air inlet and an air outlet. The isolating structure is disposed between the first cover and the second cover to distinguish the accommodating space into a first subspace and a second subspace. The isolating structure includes a through hole. As a result, airflow is guided from a side to the first air inlet easily. Then, the air inlet volume and air outlet volume of the centrifugal fan are improved.