Axial Flow Fan Circuit Board Mounting on Housing End Surface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing axial flow fans face complexity and large-size issues in their control circuits, with insufficient countermeasures for electronic component placement, particularly for large-sized components.
Innovation Solution
The design incorporates a motor part with an armature, an impeller, a housing, and multiple circuit boards, where the first circuit board is positioned radially outward of the housing's outer surface, interconnected by ribs, allowing for the placement of large electronic components without protrusion from the flange portion, and includes a flange portion with a circuit board fixing mechanism to manage component placement and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electronic components are disposed at the side of a split case, then the fan structure is simplified, but the circuit board becomes large-sized and complex
Solution Approach 1:
The patent transitions from disposing circuit boards only on the side surface to utilizing the end surface of the housing. This dimensional expansion allows circuit boards to be arranged in multiple locations (side surface and end surface), effectively increasing the available area without enlarging the overall fan structure, thus resolving the contradiction between structural simplicity and circuit board size.
2Adaptability or versatility
If large electronic components are placed on the circuit board, then the circuit functionality is improved, but the components protrude from the flange portion
Solution Approach 1:
The patent utilizes the end surface of the housing in addition to the side surface, creating a multi-surface mounting configuration. This allows large electronic components to be distributed across multiple surfaces, preventing protrusion from the flange portion while maintaining full circuit functionality. The spatial distribution across different surfaces effectively manages component size constraints.
3Volume of moving object
If the circuit board is positioned close to the housing outer surface, then the fan size is reduced, but vibration increases
Solution Approach 1:
The patent segments the circuit board mounting into multiple independent locations (side surface and end surface) rather than concentrating all components on a single surface close to the housing. This segmentation allows the circuit board to be positioned optimally at each location, maintaining compact fan size while reducing vibration through distributed mounting that prevents resonance concentration.
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 enables the efficient placement of large electronic components without protrusion, improves the degree of freedom in component arrangement, reduces vibration, and enhances the fan's reliability and noise reduction by suppressing air flow swirling and noise generation.
Implementation Method 1
The motor part includes an armature having coils
Implementation Method 2
The impeller includes a plurality of blades extending radially outward
Data Source
AI summary
A fan includes a motor part, an impeller fixed to the motor part, a housing, and a first circuit board mounted with electronic components. The motor part includes an armature having coils, and a second circuit board connected to the coils and the first circuit board. The housing surrounds outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an exhaust port which is a lower opening of the housing, a flange portion enlarged radially outward from an outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface and making contact with the first circuit board. The first circuit board is disposed spaced apart from the outer circumferential surface, positioned radially inward of a radial outer edge of the flange portion, and arranged to extend in an axial direction.