Fan Impeller with Flexible Hub Portions for Stall Reduction
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Solution Overview
Problem
Conventional axial-flow fans with fixed blade angles experience unstable airflow and noise due to stall regions during back-pressure experiments, leading to poor heat dissipation and performance.
Innovation Solution
An impeller with flexible portions connected to the hub allows dynamic adjustment of blade angles relative to airflow, reducing stall regions by using flexible materials like silica gel or rubber integrated into the hub's design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the blade angle is fixed relative to the hub, then the impeller structure is simple and easy to manufacture, but the airflow becomes unstable and stall regions appear during operation
Solution Approach 1:
The patent applies the dynamics principle by making the blade angle adjustable rather than fixed. The blade can dynamically change its angle relative to the hub according to operational conditions, allowing the impeller to adapt to varying airflow requirements and eliminate stall regions while maintaining manufacturing feasibility through a hinge mechanism.
2Device complexity
If the blade angle is fixed, then the impeller structure is simple, but noise increases and heat dissipation performance deteriorates due to stall regions
Solution Approach 1:
The blade is designed with a hinge connection that allows it to dynamically adjust its angle during operation. This dynamic adjustment eliminates stall regions, thereby reducing noise generation and improving heat dissipation performance without requiring a fundamentally complex impeller structure.
3Ease of manufacture
If the blade angle cannot change relative to the hub, then the manufacturing process is simple, but fan performance in air pressure and quantity is poor
Solution Approach 1:
The patent implements a hinge connection between the blade and hub that enables the blade to rotate and adjust its angle dynamically. This simple mechanical addition allows the fan to optimize its performance in terms of air pressure and quantity by adapting the blade angle to operational conditions, without complicating the manufacturing process.
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 dynamic adjustment improves air pressure and quantity performance, reducing noise and stall areas, thereby enhancing fan efficiency.
Implementation Method 1
The flexible portions can be made of a flexible material such as a silica gel or rubber
Data Source
AI summary
A fan includes an impeller and a fan frame. The impeller is accommodated within the fan frame. The impeller has a hub and a plurality of blades disposed around the hub. The hub has a top portion and a side wall connected with the top portion. The hub further has a plurality of flexible portions disposed and located on the side wall. The blades are connected with the flexible portions, respectively, so that the blades are connected to the hub.