Diagonal Fan Impeller Shell Blades for Backflow Resistance
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Solution Overview
Problem
Existing cooling fans face challenges in achieving increased efficiency and reduced noise levels as electronic devices generate more heat, necessitating improved airflow management.
Innovation Solution
The impeller design incorporates extended blades on the conical section shell of the fan, which obstruct backflow and create a pressure difference to reduce airflow resistance, thereby enhancing efficiency and lowering noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blade design is used, then manufacturing is simpler, but efficiency is lower and noise level is higher
Solution Approach 1:
The impeller is divided into two distinct blade systems: conventional blades connected to the hub, and extended blades disposed on the outer surface of the conical section shell. This segmentation allows each blade type to perform specific functions - conventional blades for primary airflow generation and extended blades for backflow reduction - thereby improving cooling efficiency without requiring a complete redesign of the entire impeller structure
Solution Approach 2:
The extended blades are positioned on the outer surface of the conical section shell, adding a spatial dimension to the blade configuration. This three-dimensional arrangement allows the extended blades to effectively block backflow paths that conventional two-dimensional blade designs cannot address, improving efficiency while maintaining structural integrity
2Object-affected harmful factors
If conventional blade design is used, then manufacturing is simpler, but noise level is higher
Solution Approach 1:
The extended blades utilize the backflow phenomenon to their advantage by strategically positioning themselves to block and redirect backflow paths. Instead of simply preventing backflow as a constraint, the design converts the backflow challenge into an opportunity to reduce turbulence and noise, transforming a potentially harmful effect into a beneficial noise-reduction mechanism
3Productivity
If fan operates at higher speed to improve cooling, then cooling efficiency increases, but noise level increases
Solution Approach 1:
The extended blades act as intermediary structures between the conventional blades and the surrounding air environment. They mediate the airflow by blocking backflow paths and redirecting air currents, allowing the fan to achieve improved cooling efficiency at lower operating speeds by optimizing airflow patterns rather than relying solely on increased rotational speed
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 extended blades effectively reduce backflow, allowing the fan to operate at lower speeds with improved efficiency and lower noise levels compared to conventional designs.
Implementation Method 1
The extended blades can obstruct backflow of air passing through the gap between the impeller and the frame of the fan. As a result, the efficiency of the diagonal fan is improved, and the noise produced by the diagonal fan can be reduced.
Data Source
AI summary
An impeller for a diagonal fan includes a hub, a cylindrical part, a conical section shell, a plurality of blades and a plurality of extended blades. The cylindrical part is connected to the hub and extends axially from a lower end of the hub. The conical section shell surrounds the hub. The blades are connected to the hub and an inner surface of the conical section shell. The extended blades are disposed on an outer surface of the conical section shell and project from the outer surface of the conical section shell.