Multi-Angle Fan Blade Structure for Heat Dissipation
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Solution Overview
Problem
Conventional heat dissipation fans experience reduced air volume and increased noise and vibration due to vortex shedding and turbulence, which are exacerbated at higher speeds, limiting their efficiency and lifespan.
Innovation Solution
A blade structure with multiple blade angles, where angles decrease from the inner to the outer side, guiding airflow in multiple directions and reducing vortex turbulence, is integrated into a heat dissipation device to enhance airflow and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan speed is increased to improve heat dissipation efficiency, then the heat dissipation efficiency is improved, but the vortex shedding, noise, and vibration become more obvious
Solution Approach 1:
The patent applies different blade angles to different regions of the fan blade structure. The first blade portion (near the rotation axis) has a first blade angle, while the second blade portion (farther from the rotation axis) has a second blade angle that is smaller than the first. This local differentiation allows each region to operate optimally without generating excessive vortex shedding, noise, or vibration even at high speeds.
2Quantity of substance
If the fan speed is increased to increase air volume, then the air volume increases, but the lifespan of the fan is shortened
Solution Approach 1:
By optimizing blade angles locally across different radial positions, the patent reduces vortex shedding and turbulence that cause wear and stress on the fan structure. This allows the fan to operate at higher speeds for increased air volume without excessively shortening its lifespan.
3Device complexity
If conventional fan blades are used with uniform angles, then the structure is simple, but vortex shedding occurs reducing air volume and heat dissipation efficiency
Solution Approach 1:
The patent divides the fan blade into multiple portions with different blade angles optimized for their specific radial positions. This local optimization reduces vortex shedding and improves air volume while maintaining reasonable structural simplicity through the use of segmented blade portions.
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 blade structure with multiple angles increases air volume, improves heat dissipation efficiency, and reduces noise and vibration by minimizing vortex shedding and turbulence, while maintaining a simple and aesthetically pleasing design.
Implementation Method 1
the airflow that flows through the channels among the fan blades will be guided to flow in a direction not parallel to the rotation axis due to the shape of the fan blades, becoming relatively turbulent, such that the airflow easily becomes vortex shedding after crossing the fan blades
Data Source
AI summary
A blade structure with multiple blade angles and a heat dissipation device include: the blade structure consisting of a plurality of blades with different blade angles. The blade angles of the blades decrease from an inner side to an outer side along a longitudinal direction of the blade structure. The blades have top portions on the same surface and are integrally formed in one piece. A joint between the blades has a transition part. The blade structures are evenly mounted on the hub and are connected to an outer frame. The hub and the blade structures are integrally formed in one piece, or the hub, the blade structures, and the outer frame are integrally formed in one piece. The blade structures can guide air flow to reduce air shedding, suppress backflows, reduce vortex turbulence, increase air volume, improve heat dissipation efficiency, and reduce vortex noise and vibration.