Miniature Fan Diversion Assembly for Vortex and Noise Reduction
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Solution Overview
Problem
Conventional miniature fans used in household appliances experience vortex formation and noise due to high-speed operation, leading to reduced airflow and increased noise levels.
Innovation Solution
A diversion system assembly with a cylinder, odd-numbered blades, and a conical blade wheel design featuring arched blades with varying thickness and angled ends to reduce vortex formation and noise, utilizing an arc-shaped deflector for improved airflow guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan operates at high speed to meet efficiency demands, then productivity is improved, but vortex cyclones form on the blade leeward surface causing noise and reduced air volume
Solution Approach 1:
The blade thickness is varied locally - thicker at the leading edge and thinner at the trailing edge - to control airflow characteristics and prevent vortex formation at critical locations while maintaining overall high-speed performance
Solution Approach 2:
The blade cross-section adopts a curved or arched shape rather than a straight configuration, which smooths airflow transition and reduces turbulence that leads to vortex cyclone formation during high-speed operation
2Strength
If the blade thickness is increased to strengthen the blade structure, then strength is improved, but the blade generates more resistance and forms vortex cyclones
Solution Approach 1:
The blade is designed with non-uniform thickness distribution - thicker at the leading edge where structural strength is most needed to withstand centrifugal forces, and thinner at the trailing edge where reduced thickness decreases resistance and prevents vortex formation
Solution Approach 2:
The blade cross-sectional shape is optimized in multiple dimensions, creating a three-dimensional curved profile that simultaneously achieves structural strength and aerodynamic efficiency by distributing material thickness strategically across different spatial locations
3Ease of manufacture
If conventional straight blades are used, then manufacturing is simpler, but air diversion effect is poor and vortex formation occurs
Solution Approach 1:
The blade is designed with curved cross-sections and arched profiles that follow the natural flow of air, improving air diversion effectiveness and reducing vortex formation while remaining manufacturable using standard molding or machining processes
Solution Approach 2:
The blade cross-section employs asymmetric thickness distribution with the thicker portion at the leading edge and thinner portion at the trailing edge, creating optimal airflow characteristics that enhance air diversion effect while preventing vortex cyclone formation
Data Source
AI summary
Disclosed is a diversion system assembly for a miniature fan. The diversion system assembly for a miniature fan includes a cylinder and a blade wheel located at an end opening of the cylinder and connected to a rotor. A deflector is arranged inside the cylinder. Blades are arranged in an annular array around the blade wheel. The thickness of each blade is gradually increased from two ends to the middle, thus forming an arched part in the middle of the blade. Top ends of the blades gradually tilt forward from inside to outside, and bottom ends of the blades gradually tilt backward from inside to outside.