Axial Fan Base Outer Wall Curvature for Noise Reduction
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Solution Overview
Problem
Existing axial fans do not effectively reduce abnormal noise generation through improvements in the configuration of the base portion, which is a limitation in noise reduction strategies beyond blade design.
Innovation Solution
The axial fan design includes a base portion with an outer peripheral wall extending in the air-blowing direction, featuring an upstream end inward in the radial direction relative to the impeller cup and a downstream end outward, connected by a convex curved surface, reducing air separation and velocity differences to minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the base portion is configured with a conventional structure, then the motor can be attached, but abnormal noise is generated due to air separation and pressure fluctuations
Solution Approach 1:
The outer peripheral wall portion is designed with a convex curved surface instead of a flat or angular structure. This curved configuration allows air to flow smoothly along the surface, reducing air separation and pressure fluctuations that cause abnormal noise. The curvature is specifically designed to extend from the upstream end (inward in radial direction) to the downstream end (outward in radial direction), creating a streamlined flow path.
2Object-affected harmful factors
If the outer peripheral wall portion is extended outward in radial direction, then airflow is guided, but air separation increases causing noise
Solution Approach 1:
The outer peripheral wall portion is designed with different radial positions at its ends: the upstream end is located inward in the radial direction relative to the impeller cup outer peripheral side surface, while the downstream end is located outward in the radial direction relative to the upstream end. This localized variation in radial position creates a convex curved surface that guides airflow smoothly, preventing separation and reducing noise generation.
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 configuration reduces air separation and pressure fluctuations, effectively restraining abnormal noise generation by ensuring smooth airflow and consistent discharge direction, thereby enhancing noise reduction.
Implementation Method 1
reduces air separation and pressure fluctuations
Data Source
AI summary
Provided is an axial fan including: an impeller cup; a fan extending in a radial direction from the impeller cup; a motor inside the impeller cup; and a base portion to which the motor is attached. An outer peripheral portion of the base portion is provided with an outer peripheral wall portion extending in an air-blowing direction. The outer peripheral wall portion includes an upstream end being an end on an upstream side in the air-blowing direction, and a downstream end being an end on a downstream side in the air-blowing direction. The upstream end is located inward in the radial direction relative to an outer peripheral side surface of the impeller cup. The downstream end is located outward in the radial direction relative to the upstream end.