Axial Diffuser Fan Design to Reduce Diameter and Bearing Noise
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Solution Overview
Problem
The use of radial diffusers in fans increases the diameter of the fan, leading to higher rotation speeds, which shortens bearing life and increases noise, due to the need for increased power to achieve required performance.
Innovation Solution
The implementation of an axial diffuser instead of a radial diffuser, which reduces wind resistance, energy loss, and noise by guiding chaotic airflow into a stable flow direction, thereby reducing the fan's diameter and alleviating the need for increased power and rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a radial diffuser is used to guide airflow and convert dynamic pressure to static pressure, then energy loss is reduced, but the fan diameter increases leading to higher rotation speeds and increased noise
Solution Approach 1:
The patent transitions from a traditional radial diffuser configuration to an axial diffuser configuration, fundamentally changing the spatial dimension of airflow guidance. The axial diffuser extends along the axial direction of the impeller rather than radially, allowing airflow to be guided and pressure converted in a different dimensional orientation, thereby reducing fan diameter and noise while maintaining energy efficiency
2Loss of energy
If a radial diffuser is used to reduce energy loss, then flow rate efficiency improves, but the fan diameter increases requiring higher rotation speeds
Solution Approach 1:
By reconfiguring the diffuser from radial to axial orientation, the patent changes the dimensional approach to pressure conversion. The axial diffuser allows for more efficient pressure recovery in the axial direction, enabling the fan to achieve required performance at lower rotation speeds while maintaining energy efficiency
3Volume of stationary object
If fan diameter is increased to accommodate a radial diffuser, then space for impeller rotation is provided, but bearing life is shortened due to increased rotation speed
Solution Approach 1:
The axial diffuser configuration fundamentally changes the spatial arrangement, allowing the diffuser to extend axially rather than radially. This dimensional change reduces the required fan diameter while providing sufficient space for impeller rotation, thereby reducing rotation speeds and extending bearing life
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 axial diffuser design reduces fan noise and energy loss, extends bearing life, and improves efficiency by minimizing dynamic and static interference, allowing for a more compact and quieter operation.
Implementation Method 1
an axial diffuser, fixedly connected to the motor stator, where the axial diffuser includes an outer cylinder, a main body portion arranged in the outer cylinder, and diffuser blades connected to the outer cylinder and the main body portion; the diffuser blades separate an annular space between the outer cylinder and the main body portion into more than one pressure diffusion duct
Implementation Method 2
the diffuser blades separate an annular space between the outer cylinder and the main body portion into more than one pressure diffusion duct
Implementation Method 3
an impeller, arranged in the impeller chamber, where the impeller is used to introduce air from the air inlet, and the impeller drives the air into the pressure diffusion duct through the annular no-gate channel
Data Source
AI summary
A fan including: a motor stator; an axial diffuser, fixedly connected to the motor stator and comprising an outer cylinder, a main body portion disposed in the outer cylinder, and diffuser blades connected to the outer cylinder and the main body portion, the diffuser blades separating an annular space between the outer cylinder and the main body portion into more than one pressure diffusion ducts, the main body portion being provided with a central shaft hole; an air inlet cover, fixedly connected to the axial diffuser, the air inlet cover and the axial diffuser forming an impeller chamber and an annular no-gate channel around the impeller chamber, the annular no-gate channel communicating with the impeller chamber and the pressure diffusion ducts, and the air inlet cover being provided with an air inlet; and an impeller, disposed in the impeller chamber and used to introduce air from the air inlet.