Heat Dissipation Blade Flow Guiding Concave Convex Surfaces
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Solution Overview
Problem
Conventional heat dissipation fans face challenges in increasing heat dissipation efficiency due to limitations in reducing plastic blade thickness and number, leading to increased weight and potential high-frequency noise from excessive load when fan speed is increased.
Innovation Solution
The design incorporates heat dissipation blades with a curved surface body and a flow guiding portion featuring a concave and convex surface, which increases the flow guiding area, allowing for enhanced airflow without increasing fan speed or blade count, thereby reducing motor load and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of plastic blades is increased, then the heat dissipation efficiency is improved, but the total weight of the centrifugal fan is significantly increased
Solution Approach 1:
The patent introduces a flow guiding portion with concave and convex surfaces that extends into the third dimension, creating additional airflow channels and increasing the effective flow guiding area without adding more blades. This dimensional enhancement allows the same number of blades to move more air, improving heat dissipation efficiency without increasing fan weight.
Solution Approach 2:
The patent modifies the geometric parameters of the blade by adding flow guiding portions with specific concave and convex surface configurations. This changes the aerodynamic parameters of the blade, increasing the flow guiding area and improving airflow efficiency without changing the number of blades or increasing overall blade mass.
2Productivity
If the fan speed is increased, then the heat dissipation efficiency is improved, but high-frequency noises are generated due to excessive load
Solution Approach 1:
By adding flow guiding portions with concave and convex surfaces, the patent creates additional airflow pathways that enhance air movement without requiring increased fan speed. The three-dimensional flow guiding structure improves airflow efficiency, allowing effective heat dissipation at lower rotational speeds, thereby reducing noise generation.
Solution Approach 2:
The patent optimizes aerodynamic parameters by introducing flow guiding portions with optimized concave and convex surface geometries. This improves airflow characteristics and reduces resistance, enabling effective heat dissipation at lower fan speeds and thus reducing the generation of high-frequency noise.
3Weight of moving object
If the thickness of plastic blades is reduced, then the weight is decreased, but the structural strength and manufacturing feasibility are compromised
Solution Approach 1:
Instead of reducing blade thickness, the patent adds flow guiding portions that extend in the third dimension, creating concave and convex surfaces. This approach increases the flow guiding area and improves airflow efficiency without compromising blade thickness or structural integrity, maintaining both weight efficiency and strength.
4Productivity
If the flow guiding area is increased by adding more blades, then the airflow rate is improved, but the device complexity increases
Solution Approach 1:
The patent segments the blade structure by adding a flow guiding portion with concave and convex surfaces to the existing blade body. This segmentation creates additional airflow channels and increases the flow guiding area without requiring additional blades, thereby improving airflow rate while maintaining relatively simple device architecture.
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 configuration enhances airflow rate and heat dissipation efficiency while minimizing motor load and preventing high-frequency noise, even when fan speed or blade count is reduced.
Implementation Method 1
the flow guiding portion has a concave surface and a convex surface opposite to the concave surface, the concave surface is recessed in the pressure bearing surface, and the convex surface protrudes outward from the negative pressing surface
Data Source
AI summary
A heat dissipation fan including a hub and a plurality of heat dissipation blades is provided. The heat dissipation blades are arranged around the periphery of the hub. Each of the heat dissipation blades includes a curved surface body and a flow guiding portion. The curved surface body has a pressure bearing surface and a negative pressing surface opposite to the pressure bearing surface. The flow guiding portion is connected to the curved surface body. The flow guiding portion has a concave surface and a convex surface opposite to the concave surface, wherein the concave surface is recessed in the pressure bearing surface and the convex surface protrudes outward from the negative pressing surface.