Double-Layer Fan Blade Airflow Aggregation
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Solution Overview
Problem
Existing heat dissipation fans in personal computers face limitations in increasing wind pressure and reducing noise, as their performance is primarily enhanced by blade curvature designs alone.
Innovation Solution
A heat dissipation fan with a double-layer blade structure, featuring a primary blade and a secondary blade with a secondary air intake area and air guiding grooves, which increases airflow aggregation and reduces resistance, thereby enhancing wind pressure and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer blade structure is used, then the device complexity is low, but the wind pressure and noise performance are insufficient
Solution Approach 1:
The blade is divided into two layers (primary blade and secondary blade) with the secondary blade having smaller dimensions and being positioned at a distance from the primary blade. This segmentation creates a secondary air intake area between the two blades, allowing dual airflow paths that reduce turbulence and noise while maintaining structural feasibility
Solution Approach 2:
The invention transitions from a single-layer two-dimensional blade structure to a double-layer three-dimensional structure by adding the secondary blade at a different spatial position and orientation. This dimensional expansion creates additional airflow channels and reduces aerodynamic interference, improving noise performance
2Ease of manufacture
If a single-layer blade structure is used, then the manufacturing is simple, but the wind pressure is insufficient
Solution Approach 1:
The blade system is segmented into primary and secondary blades that can be manufactured separately and then assembled. This maintains manufacturing simplicity while the combined double-layer structure generates higher wind pressure through coordinated airflow from both blades and the secondary air intake area
Solution Approach 2:
The secondary blade is nested within the overall blade assembly at a specific distance from the primary blade, creating a compact double-layer structure. This nesting approach maximizes wind pressure generation within a limited space while keeping the overall structure manufacturable and assembly-friendly
3Device complexity
If only blade curvature design is used to improve performance, then the structural changes are minimal, but the performance improvement is limited
Solution Approach 1:
Instead of merely adjusting blade curvature in two dimensions, the invention adds a third dimension by introducing a secondary blade at a different spatial level. This creates a secondary air intake area that provides an additional airflow path, significantly enhancing productivity without excessive structural complexity
Solution Approach 2:
The airflow path is segmented into two distinct channels: a primary airflow path through the primary blade and a secondary airflow path through the secondary blade. This segmentation of the airflow function dramatically improves overall airflow performance while maintaining reasonable structural 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
The double-layer blade design effectively increases wind pressure and reduces noise, improving the overall performance of the heat dissipation fan by optimizing airflow and air pressure distribution.
Implementation Method 1
the double-layer blade structure, featuring a primary blade and a secondary blade with a secondary air intake area and air guiding grooves, which increases airflow aggregation and reduces resistance
Implementation Method 2
The secondary air intake area is cone-shaped, and a near-end cross-section of the secondary air intake area close to the hub is smaller than a far-end cross-section of the secondary air intake area distant from the hub
Implementation Method 3
The connecting plate includes a streamline structure that extends from the secondary-air-intake-area air outlet end to a secondary-air-intake-area air inlet end of the primary blade
Data Source
AI summary
The present invention relates to a heat dissipation fan, where the heat dissipation fan includes a fan frame and a fan blade, where the fan blade includes a hub and a plurality of double-layer blades evenly disposed around the hub, and a primary air intake area is formed between the double-layer blades; the double-layer blade includes a primary blade and a secondary blade, where the secondary blade is fixed on the primary blade, and a secondary air intake area is formed between the primary blade and the secondary blade; and when the heat dissipation fan works, an airflow enters the primary air intake area and the secondary air intake area of the heat dissipation fan through an air inlet of the heat dissipation fan, and forms a first airflow in the primary air intake area and a second airflow in the secondary air intake area, and the first airflow and the second airflow flow out through an air outlet of the heat dissipation fan. In the present invention, the structure of the fan blade of the heat dissipation fan is improved, and the secondary blade is designed on the primary blade, and the secondary air intake area and the air guiding groove are further formed. In this way, air pressure and airflow aggregation are increased when the double-layer blades rotate, thereby reducing resistance on an air intake side, increasing wind pressure and reducing noise.