Handheld Power Tool Motor Cooling Airflow Separator
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Solution Overview
Problem
Hand-held power tools, such as angle grinders, face issues with metal chips and dirt particles entering the motor, leading to damage and electrical short circuits due to the conductive nature of these particles, which can result in reduced cooling capacity and safety risks.
Innovation Solution
A hand-held power tool design that separates the cooling air into inner and outer partial flows, using a separator to concentrate dirt particles in the outer flow, which is then discharged, maintaining the motor's cleanliness and cooling efficiency without losing cooling capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cooling air is deflected by a spiral to discharge dirt particles, then dirt particles are removed from the housing, but part of the cooling air is simultaneously discharged, reducing cooling capacity
Solution Approach 1:
The cooling air flow is segmented into two separate paths: an inner partial flow that passes through the motor for cooling, and an outer partial flow that carries dirt particles to the outlet. The separator divides the air flow into these two streams, allowing dirt removal without sacrificing motor cooling efficiency.
Solution Approach 2:
Dirt particles are extracted from the cooling air flow by the separator, which concentrates them in the outer partial air flow. This allows the inner partial air flow to remain clean and effective for motor cooling, while the outer flow handles particle removal.
2Reliability
If dirt particles are discharged separately from the machine tool, then motor damage is prevented, but cooling capacity is reduced
Solution Approach 1:
The air flow is segmented into inner and outer partial flows with different functions. The inner flow provides clean cooling to the motor, while the outer flow carries dirt particles to the outlet, achieving both protection and cooling efficiency.
Solution Approach 2:
Different regions of the air flow are given different qualities: the inner partial air flow is kept clean for motor cooling, while the outer partial air flow is allowed to become contaminated with dirt particles that are then discharged separately.
3Reliability
If the separator concentrates dirt particles in the outer partial air flow, then the inner partial air flow remains clean for motor cooling, but the outer flow becomes more polluted
Solution Approach 1:
Dirt particles are extracted from the inner partial air flow and concentrated into the outer partial air flow by the separator. This extraction process protects the motor while the contaminated outer flow is directed to the outlet for discharge.
Solution Approach 2:
The separator uses the natural flow dynamics to convert the harmful effect of dirt particles into a beneficial separation process, where particles are concentrated in the outer flow that is destined for discharge, while the inner flow remains clean for 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 effectively prevents motor damage by isolating dirt particles from the inner airflow, ensuring the motor's longevity and safety while maintaining optimal cooling performance.
Implementation Method 1
the separator concentrates the dirt particles contained in the cooling air in the outer partial air flow
Implementation Method 2
The rotating separator disc exerts a radially outward force on the dirt particles contained in the cooling air, which causes the dirt particles to be moved radially outwards away from the interior of the motor
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a hand-held power tool (1) for machining workpieces, comprising a housing (2) in which a motor (4) driving a rotor shaft (3) is accommodated, and an air guide area (7) formed in the housing (2) for supplying cooling air to the motor (4) along a main flow direction (9) oriented substantially parallel to the longitudinal axis (8) of the motor, wherein the air guide area (7) is bounded at one end by at least one air inlet (10) and at the other end by at least one air outlet (11) for discharge of the cooling air from the housing (2). A separator (12) is arranged in the air guide area (7) for dividing the cooling air into an outer partial airflow (13) flowing around the outside of the motor (4) and an inner partial airflow (14) flowing through the motor (4).The separator (12) is designed such that the degree of pollution of the outer partial airflow (13) is higher than the degree of pollution of the inner partial airflow (14).