Portable Grinder Air Cooling via Stationary Pump and Cable Duct
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Solution Overview
Problem
Electrically powered portable grinders face issues with heat management due to contaminated cooling air, which leads to reduced cooling efficiency, motor wear, and short service life, as fan-cooled systems circulate ambient dust and debris, causing clogging and overheating.
Innovation Solution
An air cooling system integrated into a cable connecting the grinder to a stationary drive unit, featuring an air pumping device with a large air filter and an air duct within the cable to provide clean cooling air, preventing dust entry and enhancing cooling efficiency while maintaining compact tool dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan and air circulation passages are incorporated in the portable grinder for cooling, then the cooling effect is improved, but the tool housing material and motor windings are worn down by dust and debris particles
Solution Approach 1:
A flexible hose is introduced as an intermediary component between the stationary cooling system and the portable grinder. This hose transports cool air from the stationary unit to the grinder without allowing dust and debris particles to enter the grinder housing, thus resolving the contradiction between achieving cooling and preventing component wear from contaminants.
2Object-affected harmful factors
If filter devices are provided in the tool housing to prevent dust penetration, then dust protection is improved, but the air penetration area is reduced causing quick clogging and reduced cooling
Solution Approach 1:
The flexible hose acts as a mediator that separates the dust-free cool air source from the dust-containing environment. By routing air through this intermediate hose rather than filtering air at the grinder housing, the system achieves both effective dust protection and maintained cooling efficiency without the trade-off of reduced air penetration area.
Solution Approach 2:
The air intake function is extracted from the grinder housing and relocated to the stationary unit. This separation allows the housing to remain free of dust-entraining air intake openings while still achieving cooling through the flexible hose connection, eliminating the need for filters that would restrict airflow.
3Temperature
If a cooling fan is installed inside the portable power tool for cooling, then the cooling effect is improved, but the outer dimensions of the tool housing are increased
Solution Approach 1:
The cooling fan is extracted from the portable grinder and relocated to the stationary unit. This extraction eliminates the space-consuming fan from the handheld tool while maintaining the cooling function through the flexible hose connection to the stationary cooling source, thus resolving the contradiction between cooling effectiveness and compact dimensions.
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 prevents contamination of the cooling air flow, improving cooling efficiency and extending the service life of the grinder by maintaining clean air circulation and reducing wear on motor components.
Implementation Method 1
an air cooling system including an air pumping device, wherein the air pumping device is associated with the drive unit
Data Source
AI summary
A portable electric grinder with an air cooling system and connected to a remote stationary voltage supply means (19, 20) via a cable (16), wherein a cooling air duct (21) is provided to connect cooling air passages (23a, b) in the grinder housing (10) to a stationary air pumping device, and the air pumping device is provided with a filter unit (24) for preventing dust and other undesirable particles from entering the air duct (21) and reaching the cooling air passages (23a, b) of the grinder housing (10).