Fan Housing Airflow Concentration Section
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Solution Overview
Problem
Conventional heat-dissipating fan housings with stationary blades suffer from noise and inefficiency in increasing wind pressure due to unguided airflows leaving the air outlet, as there is no structure to concentrate airflows effectively, leading to diffusion in different directions.
Innovation Solution
A heat-dissipating fan housing design with a casing having an impeller section, a stationary blade section, and an airflow concentration section, where the stationary blades have specific edge spacings and angles to concentrate airflows, reducing noise and increasing wind pressure by guiding airflows through the airflow concentration section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If stationary blades are designed with acute angle to longitudinal axis, then wind pressure increase is intended, but airflows leave in different directions causing noise and reduced effectiveness
Solution Approach 1:
The fan housing is segmented into three distinct functional sections: impeller section, stationary blade section, and airflow concentration section. This segmentation allows each section to perform its specific function optimally, with the airflow concentration section specifically designed to consolidate airflows that would otherwise diffuse in different directions, thereby reducing noise while maintaining wind pressure increase.
Solution Approach 2:
The airflow concentration section acts as an intermediary structure between the stationary blades and the air outlet. It mediates the airflows by concentrating them before exit, preventing the harmful diffusion effect that causes noise, while still allowing the stationary blades to function in increasing wind pressure.
2Object-generated harmful factors
If wing-shaped guiding members are added to guide airflows, then noise is reduced, but manufacturing cost increases
Solution Approach 1:
The airflow concentration function is merged with the housing structure itself rather than being a separate wing-shaped guiding member. The housing is designed with an integrated airflow concentration section that performs the guiding and concentrating function, eliminating the need for additional separate components and thereby reducing manufacturing cost while still achieving noise reduction.
Solution Approach 2:
The housing structure serves multiple functions: it contains the impeller, supports the stationary blades, and incorporates the airflow concentration section. This multi-functionality eliminates the need for separate wing-shaped guiding members, reducing component count and manufacturing complexity while achieving the same noise reduction effect.
3Device complexity
If bottom edge of stationary blade is made flush with air outlet, then structure is simplified, but airflows are not concentrated leading to noise
Solution Approach 1:
The housing is segmented into stationary blade section and airflow concentration section, with the airflow concentration section extending beyond the bottom edge of stationary blades. This segmentation allows the structure to be slightly more complex but achieves the critical function of airflow concentration, preventing noise while maintaining simplicity in the stationary blade design itself.
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 effectively reduces noise and increases wind pressure while consuming less electricity by concentrating airflows, enhancing the heat-dissipating performance compared to conventional designs.
Implementation Method 1
The airflow concentration section concentrates the airflows after passing through the stationary blades
Data Source
AI summary
A heat-dissipating fan housing includes a casing having a compartment with an impeller section, a stationary blade section, and an airflow concentration section arranged from an air inlet toward an air outlet spaced from the air inlet in an axial direction. A mounting portion is received in the compartment, and an impeller is rotatably coupled to the mounting portion for driving airflows. Stationary blades are interconnected between the casing and the mounting portion and are received in the stationary blade section. Each stationary blade includes a first edge facing the air inlet and a second edge facing the air outlet. The airflow concentration section is between the second edge of each stationary blade and the air outlet in the axial direction. The airflow concentration section concentrates the airflows after passing through the stationary blades. The noise is reduced, the wind pressure is increased, and less electricity is consumed.