Counter-rotating Axial Air Moving Device Blade Count Optimization
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Solution Overview
Problem
Counter-rotating axial air moving devices face limitations in achieving high air pressure and flowrate while maintaining low vibration and noise, requiring increased rotation speed which leads to energy inefficiency and high manufacturing precision demands.
Innovation Solution
A counter-rotating axial air moving device design with a front rotor and rear rotor, each with a specific number of blades (7-11 and 6-10 respectively) and a thickness-to-diameter ratio of 0.91-1.5, optimized to enhance static pressure-air flowrate characteristics without increasing rotation speed, reducing energy consumption and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed is increased to achieve higher air flowrate, then the air flowrate is improved, but the vibration and noise deteriorate
Solution Approach 1:
The patent changes the blade count parameter (front rotor: 7-11 blades, rear rotor: 6-10 blades) and the thickness-to-diameter ratio parameter (0.91-1.5) to optimize the static pressure-air flowrate characteristics. This allows the device to achieve higher air flowrate at lower rotation speeds, thereby reducing vibration and noise while maintaining productivity.
2Productivity
If the rotation speed is increased to achieve higher air flowrate, then the air flowrate is improved, but the energy consumption increases
Solution Approach 1:
The patent optimizes the blade count and thickness-to-diameter ratio parameters to improve the static pressure-air flowrate characteristics curve. This enables the device to operate at lower rotation speeds for the same air flowrate output, thereby reducing energy consumption while maintaining productivity.
3Stress or pressure
If the device thickness is increased to achieve higher air pressure, then the air pressure is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent sets the thickness-to-diameter ratio within the range of 0.91-1.5, which optimizes the device structure to achieve high air pressure without excessive thickness increase. This balanced parameter selection reduces the demands on manufacturing precision and bearing quality while maintaining the required air pressure performance.
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 design achieves improved static pressure-air flowrate performance at constant rotation speed, reducing vibration and noise, and lowering energy consumption while maintaining practicality.
Implementation Method 1
The motor drives the hub to rotate to make the blades push the fluid flowing
Data Source
AI summary
A counter-rotating axial air moving device includes a front rotor and a rear rotor. The front rotor includes a front hub and a plurality of front blades, and the number of the front blades is equal to or greater than 7 and equal to or less than 11. The rear rotor is disposed on the downstream side of the front rotor. The rear rotor includes a rear hub and a plurality of rear blades, and the number of the rear blades is equal to or greater than 6 and equal to or less than 10. The front rotor and the rear rotor are stacked with each other with a total thickness and a diameter. The ratio of the total thickness to the diameter is equal to or more than 0.91 and equal to or less than 1.5.