Axial Fan Motor Mounting Vane Angle Optimization
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Solution Overview
Problem
Existing axial fan designs face limitations in maximizing aerodynamic performance and minimizing noise due to constraints on the distance between the rotating impeller and the bracket arrangement, which affects airflow efficiency and turbulence.
Innovation Solution
An improved mounting arrangement using a support arm with an elongate vane that extends between the motor and the casing, featuring a connecting portion with an arcuate slot allowing for adjustable angular orientation to match the airflow direction, optimizing the angle between 65° and 60° to enhance aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressed or fabricated steel brackets are used to connect and hold the motor within the case, then the motor is securely mounted, but turbulence and airflow losses occur along the bracket arrangement
Solution Approach 1:
The support arm's angle relative to the airflow direction is optimized at approximately 45 degrees, changing the geometric parameter to minimize turbulence while maintaining structural support function
Solution Approach 2:
The support arm features an airfoil-shaped vane with a specific cross-sectional profile designed to reduce drag and turbulence in the local airflow path, while the connecting portion provides secure mechanical attachment
2Productivity
If the distance between the rotating impeller and the bracket arrangement is maximized, then aerodynamic performance is improved, but the overall fan size increases
Solution Approach 1:
The support arm angle is optimized at approximately 45 degrees to maximize the distance between impeller and mounting structure while maintaining compact fan dimensions, improving aerodynamic performance without excessive size increase
3Productivity
If the support arm angle is varied to match airflow direction, then aerodynamic performance is optimized, but the mounting complexity increases
Solution Approach 1:
The support arm is pre-configured with an airfoil-shaped vane and optimized angle (approximately 45 degrees) during manufacturing, eliminating the need for complex adjustment mechanisms while achieving aerodynamic optimization
Data Source
Figure 1~2
Figure 3~5
Figure 6a~6c
AI summary
An axial fan has a motor and an impeller housed within an outer casing, the fan further comprising a mounting assembly for mounting said motor within said casing. At least one elongate vane extends between the inner wall of the casing and the motor and is connected to the motor by means of a connector assembly comprising means for connecting said vane to said motor at a selected one of a plurality of distances from said impeller. In one embodiment, this can be achieved by means of a plurality of discrete mounting holes defining the respective distances.