Snap-Fit Sensor Support for Electric Fan Motor-Impeller Units
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Solution Overview
Problem
Existing supports for rotation sensors in motor-impeller units of electric fans are bulky and complex, hindering dimension reduction and simplifying assembly, which is problematic in applications where compactness and ease of assembly are crucial.
Innovation Solution
A support with a plate-like base and snap-fitting mechanism that removably secures the sensor control card and magnet, featuring guided sliding insertion and resilient snap-fitting projections for secure and easy attachment to the motor mounting, allowing for reduced overall dimensions and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor and control card are housed in a special seat formed in the enclosing cover, then the sensor is securely positioned, but the overall dimensions increase and structural complexity increases
Solution Approach 1:
The invention divides the sensor housing function into separate components: the control card is retained by the support structure, while the magnet is retained by the enclosing cover. This segmentation eliminates the need for a specialized integrated seat, reducing overall dimensions while maintaining secure positioning of both components.
Solution Approach 2:
The support structure serves multiple functions: it provides electrical connection between the control card and motor, supports the control card, and positions the magnet. This multi-functionality eliminates the need for separate specialized housing features, reducing structural complexity and overall dimensions.
2Reliability
If the sensor and control card are housed in a special seat formed in the enclosing cover, then the sensor is securely positioned, but the structural complexity increases
Solution Approach 1:
The invention divides the sensor housing function into separate components: the control card is retained by the support structure, while the magnet is retained by the enclosing cover. This segmentation eliminates the need for a specialized integrated seat, reducing structural complexity while maintaining secure positioning of both components.
Solution Approach 2:
The support structure serves multiple functions: it provides electrical connection between the control card and motor, supports the control card, and positions the magnet. This multi-functionality eliminates the need for separate specialized housing features, reducing structural complexity.
3Reliability
If a traditional mounted support is used, then the sensor is securely retained, but the assembly time increases and tool requirements increase
Solution Approach 1:
The invention replaces traditional mechanical fastening systems (screws, clips requiring tools) with a snap-fit retention mechanism. The control card is retained by engagement features that allow tool-free assembly, while the magnet is secured by resilient snap-fitting projections, significantly reducing assembly time and eliminating tool requirements.
4Reliability
If a traditional mounted support is used, then the sensor is securely retained, but the assembly complexity increases
Solution Approach 1:
The invention replaces traditional mechanical fastening systems (screws, clips requiring tools) with a snap-fit retention mechanism. The control card is retained by engagement features that allow tool-free assembly, while the magnet is secured by resilient snap-fitting projections, significantly reducing assembly time and eliminating tool requirements.
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 solution achieves reduced overall dimensions and simplified assembly of the rotation sensor support, enabling faster and tool-free mounting, particularly beneficial in space-constrained applications.
Implementation Method 1
at least one of the snap-fitting projections (25c, 25d, 25e) is resilient and capable of undergoing elastic deformation
Implementation Method 2
this feedback is conveniently obtained by means of a Hall effect sensor, interacting with a magnet rotating integrally with the motor-impeller unit of the fan
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
What is described is a support for a rotation sensor (12) in a motor-impeller unit (1) of an electric fan (3), of the type which includes a motor support mounting (7) which can be fixed to an outer wall (5) of a scroll-shaped casing (4) of the fan (3), the rotation sensor (12) being designed to interact, in use, with a magnet (13) rotating integrally with the motor shaft. The support comprises a seat (16) for removably retaining an electronic circuit card (14) including the sensitive part of the rotation sensor (12), and removable snap-fitting means capable of interacting with a profile of a through hole (11a) formed in the mounting (7), in such a way that the support is retained removably on the mounting (7), thus ensuring the correct positioning of the rotation sensor (12) and the rotating magnet (13) relative to one another.