Dual-Profile Vortex Fan Blade Structure for Backflow Reduction
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Solution Overview
Problem
Existing centrifugal fans suffer from backflow and weak impedance overcoming capability, leading to low air volume and energy loss, which is inadequate for high-performance laptops requiring efficient heat dissipation.
Innovation Solution
A dual-profile strong-suction vortex fan blade design featuring centrifugal and axial flow blades, where the number of axial flow blades is half that of centrifugal blades, with each axial flow blade obliquely guiding external gas into gaps between centrifugal blades, and having curved surfaces to enhance air suction and inhibit backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional centrifugal fans are used for rapid heat dissipation, then heat dissipation performance is improved, but backflow occurs causing weak impedance overcoming capability and low air volume
Solution Approach 1:
The fan blade is segmented into two distinct functional zones: a centrifugal blade portion for radial air discharge and an axial flow blade portion for axial air guidance. This segmentation allows each portion to perform its specific function optimally, preventing backflow while maintaining high heat dissipation performance
Solution Approach 2:
The patent merges centrifugal and axial flow blade structures into a single integrated fan blade design. The centrifugal portion handles radial air movement for heat dissipation while the axial flow portion guides air to prevent backflow, combining the advantages of both fan types to achieve high productivity without energy loss
2Device complexity
If axial flow blades and centrifugal blades are simply spliced together, then structure complexity is reduced, but impedance overcoming capability remains weak and air volume is low
Solution Approach 1:
Different portions of the fan blade are designed with different structural qualities: the centrifugal portion has a specific curvature optimized for radial air discharge, while the axial flow portion has a different curvature optimized for axial air guidance. This local quality differentiation ensures optimal performance in each zone without requiring complex overall structure
Solution Approach 2:
The fan blade employs asymmetric design where the centrifugal and axial flow portions are not simply symmetric splices but have different geometries optimized for their respective functions. The axial flow portion is specifically designed with an asymmetric angle to effectively guide air and prevent backflow, enhancing air volume without excessive complexity
3Productivity
If the number of axial flow blades is increased to improve air guidance, then air suction capacity increases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of increasing the number of axial flow blades throughout the entire fan structure, the patent applies axial flow blade portions only to specific regions where they are most effective at guiding air and preventing backflow. This partial application achieves improved air suction capacity without proportionally increasing manufacturing complexity
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
Significantly improves axial air suction capacity, reduces backflow, and increases air volume by up to 15%, meeting the heat dissipation needs of high-performance laptops.
Implementation Method 1
each axial flow blade extends obliquely relative to an axial direction and gradually approaches two adjacent gaps which are right opposite to the axial flow blade, so that each axial flow blade guides external gas into the two corresponding gaps in order
Implementation Method 2
the centrifugal fan, also referred to as a radial fan, may be interpreted as a fan in which incoming air is along an axial direction of the fan while outcoming air is along a radial direction of the fan
Implementation Method 3
a small part of the air will overflow in an opposite direction to the axial air incoming direction and collide with the incoming air in the axial direction, and even forms a vortex in the fan
Data Source
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AI summary
Provided are a dual-profile strong-suction vortex fan blade, a fan and an electronic device. The dual-profile strong-suction vortex fan blade includes a base, and a plurality of centrifugal blades and a plurality of axial flow blades respectively connected to the base. The plurality of centrifugal blades and the plurality of axial flow blades circumferentially surround an outer periphery of the base, respectively, and the plurality of axial flow blades are arranged at an air intake side of the plurality of centrifugal blades. A gap is formed between every two adjacent centrifugal blades. The number of centrifugal blades is 2N times the number of axial flow blades, so that the number of gaps is also 2N times the number of axial flow blades. Each axial flow blade extends obliquely relative to an axial direction and gradually approaches two adjacent gaps which are right opposite to the axial flow blade, so that each axial flow blade guides external gas into the two corresponding gaps in order. The present disclosure solves the technical problem of low air volume of existing centrifugal fans due to the weak impedance overcoming capability.