Heat Dissipation Fan With Protrusion Structures For Noise Reduction
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Solution Overview
Problem
Existing heat dissipation fans in notebook computers face issues with reduced flow rate and air pressure due to uneven air intake caused by varying fan inlet angles, which compromises noise performance and airflow efficiency.
Innovation Solution
The design incorporates protrusion structures around the central shaft driving surface to vary the fan air inlet angle, ensuring a more uniform airflow by controlling the flow field, with fan blades connected between the central shaft and the protrusion structures, improving air pressure and flow rate while reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If unequal spacing design of fan blades is used to reduce howling sound and improve noise performance, then noise performance is improved, but flow rate and air pressure are reduced due to uneven air intake caused by varying fan inlet angles
Solution Approach 1:
The patent applies local quality by differentiating the treatment of fan blades into two groups: first fan blades with uniform inlet angles for stable airflow intake, and second fan blades with varying inlet angles for noise reduction. This localized differentiation allows each group to optimize for its specific function while working together to resolve the contradiction between noise performance and airflow efficiency.
Solution Approach 2:
The patent segments the fan blade system into two distinct functional groups: first fan blades connected to the central shaft driving surface with uniform spacing and inlet angles, and second fan blades connected to protrusion structures with varying inlet angles. This segmentation allows independent optimization of each group's characteristics to simultaneously achieve both noise reduction and maintained airflow performance.
2Productivity
If uniform spacing design of fan blades is used to maintain stable airflow intake, then flow rate and air pressure are maintained, but howling sound increases and noise performance deteriorates
Solution Approach 1:
The patent divides the fan blade system into two functional segments: first fan blades with uniform spacing that maintain stable airflow and pressure, and second fan blades with varying spacing that reduce howling sounds. This segmentation allows each segment to perform its specialized function without compromising the other, resolving the contradiction between airflow stability and noise reduction.
Solution Approach 2:
The patent applies local quality by assigning different inlet angle characteristics to different fan blade groups: uniform inlet angles for first fan blades to ensure stable airflow intake, and varying inlet angles for second fan blades to scramble sound frequencies and reduce howling. This localized functional differentiation resolves the contradiction between maintaining airflow performance and reducing noise.
3Object-generated harmful factors
If fan inlet angles are varied to scramble sound frequency and reduce howling, then noise performance is improved, but air intake becomes uneven causing reduced flow rate
Solution Approach 1:
The patent segments fan blades into two groups with different inlet angle characteristics: first fan blades with uniform inlet angles that ensure even air intake and maintain flow rate, and second fan blades with varying inlet angles that scramble sound frequencies to reduce howling. This segmentation allows each group to optimize for its specific function while collectively resolving the contradiction between noise reduction and airflow maintenance.
Solution Approach 2:
The patent applies local quality by differentiating the inlet angle design between first fan blades (uniform angles for stable air intake) and second fan blades (varying angles for noise reduction). This localized functional assignment allows the system to simultaneously achieve both even air intake and howling sound reduction, resolving the technical contradiction.
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 enhances airflow uniformity, increasing flow rate by 5.1% and air pressure by 13.4% while reducing noise levels by scrambling the tone of the original frequency band sound, thereby improving overall fan performance and noise quality.
Implementation Method 1
the plurality of protrusion structures are configured to vary the fan air inlet angle to control a flow field of an airflow entering the fan air inlet angle
Implementation Method 2
Through the unequal spacing design of the fan blades, a sharpness or tone of an original same frequency band sound generated as the heat dissipation fan rotates is scrambled, thereby reducing a howling sound and improving the noise performance
Data Source
AI summary
A heat dissipation fan includes: a body including a fan air inlet surface, a central shaft driving surface located inside the fan air inlet surface, and a plurality of protrusion structures configured at spacings in a circumference direction of the central shaft driving surface; and fan blades including first fan blades connected between the central shaft driving surface and the fan air inlet surface, and second fan blades connected between the protrusion structure and the fan air inlet surface. A fan air inlet angle is formed between each fan blade and the central shaft driving surface, and the plurality of protrusion structures are configured to vary the fan air inlet angle to control a flow field of an airflow entering the fan air inlet angle.