Transverse Airflow Cooling for Hand-Held Power Tools
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Solution Overview
Problem
Existing cooling devices for hand-held power tools, such as angle grinders, are inefficient in guiding airflow to effectively cool internal components, particularly those located away from the air inlet opening, leading to inadequate cooling of critical electronics and drive units.
Innovation Solution
A cooling device with a first air guide channel that directs airflow perpendicularly from the air inlet opening to the opposite side of the housing, extending significantly within the tool, utilizing a fan unit and sealing elements to ensure a homogeneous and reliable cooling effect, with optional secondary air guide channels and airflow routing to enhance cooling coverage even when primary inlets are covered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If airflow is guided only locally near the air inlet opening, then the cooling device structure is simple, but internal components located away from the air inlet opening cannot be effectively cooled
Solution Approach 1:
The patent introduces a transverse airflow direction perpendicular to the main tool axis, creating a three-dimensional cooling path that reaches components along the entire tool length. The first air guide channel extends from the air inlet opening transverse to the air outlet opening, guiding airflow along the drive unit and electronics unit in a direction perpendicular to the tool's main extent, thereby cooling components that would otherwise be inaccessible.
2Reliability
If the air guide channel extends perpendicular to the main tool axis, then airflow reaches components along the entire tool extent, but the airflow path becomes longer and more complex
Solution Approach 1:
The cooling device is segmented into multiple functional air guide channels: a first air guide channel for transverse airflow perpendicular to the tool axis, and a second air guide channel for longitudinal airflow parallel to the tool axis. This segmentation allows each channel to perform a specific cooling function, with the first channel targeting components near the air inlet and the second channel providing additional cooling paths, thereby achieving comprehensive coverage through modular design.
3Temperature
If multiple air guide channels are used to enhance cooling coverage, then cooling reliability improves, but the device structure becomes more complex
Solution Approach 1:
The air guide channels are designed to serve multiple functions: the first air guide channel not only guides cooling airflow transverse to the tool axis but also structurally supports the drive unit and electronics unit. The second air guide channel provides both additional cooling paths and structural support. This multi-functionality reduces the need for separate structural components, thereby limiting the increase in device complexity while achieving enhanced cooling coverage.
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 provides effective cooling of internal components by guiding airflow along the entire extent of the hand-held power tool, ensuring reliable operation and extended tool life by maintaining optimal temperatures despite increased usage or environmental conditions.
Implementation Method 1
A cooling device for a hand-held power tool, in particular an angle grinder, has a first air guide channel for guiding a first airflow, and has a first air inlet opening that is designed to guide the first airflow into a housing of the hand-held power tool
Implementation Method 2
The first airflow is designed to flow into the housing through the first air inlet opening, and to be guided, by means of the first air guide channel, from the first air inlet opening substantially to a side that faces away from the first air inlet opening
Data Source
AI summary
A cooling device for a hand-held power tool, in particular an angle grinder, includes a first air guide channel configured to guide a first airflow and a first air inlet opening configured to guide the first airflow into a housing of the hand-held power tool. The first airflow is guided such that the first airflow extends/flows from the first air inlet opening to a side of the housing that faces away from the first air inlet opening.