Centrifugal Blower Blade Rib and Fin Segmentation
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Solution Overview
Problem
Centrifugal blowers in electronic devices face a trade-off between reducing thickness for lightweight designs and maintaining impelling power, where increasing blade number or reducing blade thickness either increases wind resistance or compromises structural strength, making them difficult to manufacture.
Innovation Solution
The centrifugal blower design incorporates a rib structure with a thicker cross-section for structural strength and thinner fins that extend from the rib, optimizing blade width ratios to decrease wind resistance and noise while increasing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the blower is reduced to make it thin and lightweight, then the thickness and weight are improved, but the height of the blades is decreased and the impelling power suffers
Solution Approach 1:
The blade is segmented into three distinct parts: a root portion connected to the hub, a fin portion extending from the root, and a rib portion connecting the fin to the hub. This segmentation allows each part to be optimized independently - the root provides structural support, the fin generates thrust, and the rib reinforces the structure, resolving the contradiction between thinness and impelling power
Solution Approach 2:
Different regions of the blade are given different thicknesses and structures tailored to their specific functions. The root portion has greater thickness for structural support, the fin portion has optimized thickness for aerodynamic performance, and the rib portion provides localized reinforcement. This local differentiation allows the blade to achieve both thinness overall and sufficient impelling power in critical areas
2Power
If the number of blades is increased to improve the impelling power, then the impelling power is improved, but the wind resistance of the blades is increased
Solution Approach 1:
The blade design changes key parameters including the number of fins (2-5 fins per blade), the thickness ratio between rib and fin (rib thickness 0.3-0.6mm, fin thickness 0.15-0.35mm), and the width distribution (rib width 30-50% of total blade width). These parameter optimizations reduce wind resistance while maintaining impelling power through improved aerodynamic efficiency
3Object-affected harmful factors
If the thickness of the blades is reduced to decrease wind resistance, then the wind resistance is decreased, but the structural strength of the blades is decreased and the blades become difficult to manufacture by injection molding
Solution Approach 1:
The blade is divided into root, fin, and rib portions with the rib providing structural reinforcement. The rib portion has greater thickness (0.3-0.6mm) compared to the fin portion (0.15-0.35mm), creating a built-in reinforcement structure that maintains structural strength while allowing the overall blade to be thin for reduced wind resistance
Solution Approach 2:
The blade employs non-uniform thickness distribution with thicker regions (rib and root) positioned where structural strength is critical and thinner regions (fin portions) positioned where aerodynamic performance is prioritized. This local quality differentiation resolves the contradiction between wind resistance and structural strength
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 structural strength, reduces wind resistance and noise, and improves airflow by maintaining sufficient structural integrity while minimizing the thickness of the fins, allowing for more efficient air flow and easier manufacturing.
Implementation Method 1
a motor (40), wherein the shaft (32) is connected to the hub (31) and the motor (40) rotates the shaft (32)
Implementation Method 2
a centrifugal blower includes a hub (31), a shaft (32), a motor (40), and a plurality of blades (10)
Data Source
AI summary
A centrifugal blower is provided. The centrifugal blower includes a hub, a shaft, a motor, a plurality of blades, a rib, and a first fin. The shaft is connected to the hub. The motor rotates the shaft. Each blade includes a rib and a first fin. The rib is connected to the hub, wherein the rib extends from the hub to an end of the blade. The first fin is disposed on a first side of the rib and connected to the hub, wherein the first fin includes a first surface, the rib protrudes from the first surface, and the thickness of the first fin is less than the thickness of the rib.