Hand-Held Power Tool Cooling Unit With Segmented Air Channels
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Solution Overview
Problem
Compact hand-held power tools face inefficiencies in cooling systems, particularly due to contamination from metal particles which can lead to impaired performance and reduced cooling effectiveness.
Innovation Solution
The integration of a closed air channel within the housing of the hand-held power tool, which directs cooling air directly to the motor while minimizing turbulence, preventing dust deposition and ensuring efficient airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan sucks cooling air through the housing to cool the motor, then the motor cooling efficiency is improved, but metal particles and dust are sucked in with the cooling air causing contamination and deposition in the hand-held power tool
Solution Approach 1:
The housing is divided into separate air channels: a first air channel for cooling air that is substantially closed to prevent particle entry, and a second air channel for exhaust air that handles contaminated air separately. This segmentation allows the cooling function to be maintained while preventing contamination.
Solution Approach 2:
A separator is introduced as an intermediary component between the exhaust air channel and the external environment. The separator prevents metal particles and dust from the exhaust air from being sucked back into the cooling air intake, while still allowing the exhaust air to be discharged.
2Temperature
If cooling air is run directly to the motor via an air channel, then the motor cooling efficiency is improved, but turbulence in the cooling air causes dust deposition blocking the airflow cross sections
Solution Approach 1:
The first air channel is designed with specific local qualities: it is substantially closed and positioned to prevent turbulence and dust deposition in critical areas. The air channel geometry is optimized to maintain laminar flow directly to the motor while preventing dust accumulation at bends or transitions.
3Temperature
If the cooling air flow cross sections are blocked by dust deposition, then the motor cooling and other component cooling are impaired, but the housing structure needs to provide sufficient structural strength
Solution Approach 1:
The housing is segmented into multiple functional air channels with distinct purposes: a substantially closed first air channel for clean cooling air supply, and a separate second air channel for exhaust air discharge. This segmentation prevents cross-contamination and maintains cooling efficiency while the housing maintains its structural integrity.
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 enhances motor cooling efficiency, reduces the risk of contamination, and maintains performance even in rough environments by ensuring unobstructed airflow and effective heat dissipation.
Implementation Method 1
a cooling unit which is realized for the purpose of cooling the motor... a cooling air flow is conductible from an air intake opening of the housing directly to the motor via the air channel
Data Source
AI summary
A hand-held power tool includes a housing, a motor, a cooling unit, and a plurality of electronics. The housing includes a first housing part and an air intake opening. The motor is assigned to a drive train of the hand-held power tool. The cooling unit is configured to cool the motor. The plurality of electronics is located in the housing. The first housing part includes at least one air channel that is integral with the first housing part. The air intake opening is configured to conduct a cooling air flow directly to the motor via the at least one air channel.