Fan Circuit Board External Mounting to Reduce Airflow Turbulence
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Solution Overview
Problem
Conventional fan designs face inefficiencies and noise issues due to non-symmetrically disposed circuit board lugs that influence air stream flow, leading to turbulence and vortex phenomena, especially in small-sized fans, which restricts space and reduces fan efficiency.
Innovation Solution
The fan design features a circuit board positioned externally on the fan frame, using a connecting member to secure it, allowing for flexible component placement without obstructing air flow, thus avoiding turbulence and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the circuit board is accommodated inside the fan frame, then the space utilization is improved, but the air stream flow is influenced causing turbulence and vortex
Solution Approach 1:
The circuit board is extracted from the interior space of the fan frame and relocated to the outer surface of the fan frame. This extraction eliminates the interference of the circuit board with the air stream flow path, preventing turbulence and vortex formation, while the connecting member provides secure mounting on the external surface.
2Productivity
If the rotating speed of the fan is increased to improve heat dissipation efficiency, then the heat dissipation efficiency is improved, but the current required to drive the motor increases
Solution Approach 1:
The patent changes the spatial arrangement parameter of the circuit board from internal to external positioning. This parameter change optimizes the aerodynamic flow characteristics, reducing turbulence and improving air stream efficiency, which enhances heat dissipation efficiency without requiring increased motor current.
3Area of stationary object
If a projecting lug is designed on the circuit board to enlarge space, then the space for electronic components is enlarged, but the air stream flow directions are influenced causing turbulence
Solution Approach 1:
The circuit board with its projecting lugs is extracted from the internal air stream path and mounted on the external surface of the fan frame. This removes the source of turbulence (the lugs) from the critical air flow region, eliminating the harmful flow disturbances while preserving the enlarged utility area of the circuit board.
Solution Approach 2:
The circuit board is relocated from the two-dimensional internal plane to the three-dimensional external surface of the fan frame. This dimensional transition places the circuit board and its projecting lugs outside the primary air stream flow path, eliminating their interference with air flow while maintaining their functional space.
Data Source
AI summary
A fan includes an impeller, a motor, a circuit board, a fan frame and a connecting member. The motor is used to drive the impeller to rotate. The circuit board is electrically connected to the motor. The impeller and the motor are accommodated in the fan frame. The connecting member is disposed at one side of the fan frame. The circuit board is disposed between the connecting member and the fan frame. Also, a fan assembly including such two fans is also disclosed.