Centrifugal Fan Protection in Electric Power Tools
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Solution Overview
Problem
Existing electric power tools face challenges in preventing damage to fans from foreign matter like crushed pieces and dust particles without increasing the number of parts required for assembly, as separate filters or additional housing components are needed to achieve this protection.
Innovation Solution
An electric power tool design featuring a housing with a centrifugal fan, an annular air collecting member, and ventilation windows, where wall bodies on the air collecting member are positioned to prevent direct impact from foreign matter and guide cooling air efficiently through slits, reducing the need for additional parts and enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate filter or additional housing component is added to protect the fan from foreign matter, then the fan protection is improved, but the number of parts increases
Solution Approach 1:
The patent combines the air collecting member and the protective wall body into a single integrated component. The wall body is formed as an integral part of the air collecting member, eliminating the need for separate filters or additional protective components while still providing effective protection against foreign matter intrusion.
Solution Approach 2:
The air collecting member serves multiple functions: it collects cooling air, guides airflow through slits, and provides protective shielding against foreign matter through its integrated wall body. This multi-functional design eliminates the need for separate protective components.
2Productivity
If the air collecting member is designed with wall bodies to guide airflow and protect the fan, then the airflow efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The air collecting member is segmented with multiple wall bodies arranged in a comb-teeth pattern, creating slits that guide airflow efficiently. This segmentation provides effective airflow control while maintaining a relatively simple overall structure that can be manufactured as a single integrated component.
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 effectively suppresses damage to the centrifugal fan from foreign matter while improving airflow and heat dissipation, reducing the number of parts needed for assembly and enhancing the tool's operational efficiency.
Implementation Method 1
a centrifugal fan that cools the motor housed in the housing
Implementation Method 2
a wall body provided on the air collecting member and positioned on an inner side of the ventilation window
Implementation Method 3
an annular air collecting member housed in the housing and disposed between the motor and the centrifugal fan to collect cooling air by the centrifugal fan
Data Source
AI summary
An electric power tool capable of suppressing damage to a fan housed in a housing to cool a motor due to foreign matter without increasing the number of parts. An impact driver includes a motor, a centrifugal fan attached to an output shaft of the motor to cool the motor, an annular air collecting member disposed between the motor and the centrifugal fan to collect cooling air by the centrifugal fan, a housing that houses the motor, the centrifugal fan, and the air collecting member, and ventilation windows formed in the housing to communicate between the inside and the outside of the housing on the outer side of the centrifugal fan. The air collecting member is provided with wall bodies positioned on the inner side of the ventilation windows.