Centrifugal Heat Dissipation Fan With Speed-Responsive Bending Plates
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Solution Overview
Problem
Manufacturing and assembly tolerances cause blade deflection in centrifugal heat dissipation fans, especially at low rotating speeds, leading to unstable operation and reduced air inlet volume.
Innovation Solution
The use of movable bending plates on metal blades that adjust their angles relative to the blade body with rotating speed, allowing for increased air inlet volume and reduced deflection by enhancing flexibility at high speeds and returning to a folded state at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross-sectional height of blades along the rotation axial direction is increased to increase air inlet volume, then the air inlet volume is improved, but the blades are more prone to deflection when rotating at low speeds
Solution Approach 1:
The blade cross-sectional height is made variable along the rotation axial direction, transitioning from a fixed structure to a dynamic one. The blade height increases from the hub toward the tip, allowing the blades to capture more air at higher speeds while maintaining stability at lower speeds through the graduated geometry.
Solution Approach 2:
Different sections of the blade have different cross-sectional heights. The blade height is locally optimized at each position along the rotation axial direction, with the lower sections having smaller heights and the upper sections having larger heights, creating a gradient that balances air inlet volume and structural stability.
2Productivity
If the blade cross-sectional height is increased to improve air inlet volume, then the air inlet efficiency is improved, but the manufacturing and assembly tolerance requirements become more stringent
Solution Approach 1:
The blade cross-sectional height is varied locally along the rotation axial direction, with different height values at different positions. This local variation allows each section to be manufactured and assembled with appropriate tolerances for its specific function, reducing the overall manufacturing precision requirements compared to a uniform high-height blade design.
Solution Approach 2:
The blade cross-sectional height parameter is changed along the rotation axial direction, creating a gradient profile. This parameter variation allows the blade to achieve high air inlet efficiency while distributing manufacturing tolerances across different sections, making the overall manufacturing process more feasible.
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
Improves air inlet efficiency and reduces blade deflection by optimizing blade geometry and flexibility, enhancing performance and stability across varying rotational speeds.
Implementation Method 1
movable bending plates of metal blades to change the height of the metal blades along the rotation axial direction with the rotating speed
Implementation Method 2
The principle of the centrifugal heat dissipation fan is to rotate the blades to generate a pressure difference, so that the air from the external environment enters the fan cavity along the axial direction. Then, it is driven by the rotation of the blades and is discharged from the fan cavity along the radial direction.
Data Source
AI summary
A centrifugal heat dissipation fan including a housing and a blade wheel disposed in the housing is provided. The housing has two inlets on a rotation axial direction of the blade wheel and at least one outlet on a rotation radial direction of the blade wheel. The blade wheel has a hub and a plurality of metal blades disposed and surrounding to the hub. Each of the metal blades has a body, an upper bending plate and a lower bending plate, wherein the upper bending plate and the lower bending plate are movable relative to the body. An including angle of the upper bending plate relative to the body, and an including angle of the lower bending plate relative to the body are changeable along with the rotating speed of the blade wheel.