Centrifugal Fan Guide for Disc Grinder Cooling
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Solution Overview
Problem
Conventional electric power tools experience disturbed airflow from the motor to the centrifugal fan, which hinders the increase in airflow flow rate and cooling efficiency.
Innovation Solution
An electric power tool design featuring a centrifugal fan with a fan guide comprising a first flow-regulating member guiding cooling air radially outward and a second flow-regulating member with a base portion, an outer wall, and extended portions that slope inwardly, reducing axial distance along the rotation direction to enhance airflow guidance and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional fan structure is used, then the device complexity is reduced, but the airflow flow rate and cooling efficiency deteriorate due to disturbed airflow
Solution Approach 1:
The fan guide is divided into multiple functional segments: a first flow-regulating member with a guide portion for radial airflow guidance, and a second flow-regulating member with extended portions for axial airflow direction. This segmentation allows each part to optimize specific airflow paths, reducing turbulence and improving overall cooling efficiency without excessive complexity.
Solution Approach 2:
The invention transitions from a simple radial fan structure to a three-dimensional flow control system by adding extended portions that project in the axial direction. This dimensional addition creates a more complex but effective flow path that guides air from the motor radially outward and then axially forward, improving airflow rate and cooling efficiency.
2Volume of moving object
If the fan size is reduced to decrease tool size, then the overall dimensions are improved, but the cooling efficiency deteriorates due to insufficient airflow
Solution Approach 1:
The invention optimizes geometric parameters of the fan guide, specifically the axial distance between the first and second flow-regulating members. By gradually reducing this axial distance along the rotation direction of the centrifugal fan, the design achieves efficient cooling within a compact volume, balancing tool size reduction with maintained cooling performance.
3Object-affected harmful factors
If a simple fan housing is used, then the device complexity is reduced, but noise levels increase due to unguided airflow turbulence
Solution Approach 1:
The fan guide acts as an intermediary structure between the centrifugal fan and the external environment. It mediates the airflow by providing structured passages that guide air smoothly from the motor area radially outward and then axially forward, reducing turbulence and noise while maintaining effective cooling.
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 design improves airflow flow rate and cooling efficiency by minimizing airflow disturbance and ensuring effective cooling air discharge, thereby enhancing the overall performance of the electric power tool.
Implementation Method 1
a centrifugal fan that generates cooling air for cooling the motor
Data Source
Figure 1
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AI summary
A disc grinder 1 comprises: a motor 4 serving as a driving source; a housing 5 in which the motor 4 is housed; a centrifugal fan 18 mounted on an output shaft 3 of the motor 4, and configured to provide cooling air for cooling the motor 4; and a first flow-regulating member 51 for guiding cooling air in a radially-outward direction of the output shaft 3, and a second flow-regulating member 52 for guiding cooling air guided by the first flow-regulating member 51 toward the front end of the housing 5.