Diagonal Fan Backflow Channel Reduces Turbulence
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Solution Overview
Problem
Conventional communication equipment fans face challenges in improving efficiency and reducing noise under severe system conditions, with backflow and turbulence issues affecting heat dissipation performance.
Innovation Solution
A diagonal fan design with an optimized chamber featuring a gradually expanding impeller hub, staggered guiding walls, and a backflow channel with parallel inner and outer surfaces, reducing backflow and turbulence by directing airflow and backflow in aligned directions, and utilizing balance holes to minimize collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fan design is used, then structure is simple, but backflow and turbulence occur reducing efficiency
Solution Approach 1:
The fan structure is segmented into multiple functional zones: inlet section, working section with impeller, and outlet section with diffuser. The backflow channel is further segmented into intake, horizontal, and exhaust sections. This segmentation allows each zone to be optimized independently for its specific function, reducing overall backflow and turbulence while maintaining structural simplicity.
Solution Approach 2:
The backflow channel acts as an intermediary structure between the outlet and inlet, providing a controlled path for backflow to reduce turbulence intensity. The guiding wall serves as an intermediary element that directs airflow and separates the working section from the backflow channel, preventing harmful interactions between mainstream and backflow.
2Productivity
If fan speed is increased to improve heat dissipation, then efficiency improves, but noise increases
Solution Approach 1:
The backflow channel converts the harmful backflow phenomenon into a beneficial feature by providing a controlled recirculation path. This reduces turbulence intensity and noise while maintaining high-speed operation efficiency, allowing the fan to operate at higher speeds without proportionally increasing noise levels.
3Productivity
If impeller hub diameter is increased to improve airflow, then productivity improves, but device complexity increases
Solution Approach 1:
The impeller hub diameter is varied along the axial direction, being larger at the inlet and gradually decreasing toward the outlet. This parameter change optimizes airflow at different stages of the impeller, improving overall airflow efficiency without requiring a uniformly large hub that would increase 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
Enhances fan characteristics by reducing noise and improving airflow efficiency through reduced backflow and turbulence, leading to better heat dissipation and system performance.
Implementation Method 1
the fan is mainly used to perform the forced convection on the system to achieve the purpose of heat dissipation
Implementation Method 2
the flow velocity and the kinetic energy of the flow field are reduced gradually
Data Source
AI summary
A diagonal fan is disclosed and includes a frame and an impeller. The frame includes an inlet, an outlet, an accommodation space and a guiding wall. The inlet and the outlet are communicated through the accommodation space. The guiding wall is extended along an axial direction to the accommodation space. The impeller is accommodated within the accommodation space and includes a conical section shell. When the impeller is rotated, an airflow flowing is generated. The outer diameter of the hub of the impeller is expended gradually in a direction from the inlet toward the outlet, so that the flowing direction of the airflow is expended gradually around the peripheral of the impeller. A gap having a spacing distance is substantially maintained to form a backflow channel. A backflow is transported through an intake section, a horizontal section and an exhaust section of the backflow channel, and converged with the airflow.