Thermoelectric Cooling for Power Tool Gripping Surfaces
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Solution Overview
Problem
Existing power tools, particularly those with motor housings used as gripping regions, face challenges in actively cooling the gripping surfaces, as current methods only dissipate heat and do not reduce temperature below ambient levels.
Innovation Solution
Incorporation of a thermoelectric cooling system, comprising thermally conductive plates with dissimilar semi-conductors and a heat sink, to actively cool the gripping surfaces by absorbing heat from the gripping surface and dissipating it outside the gripping region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an insulating boot is used to minimize heat transfer to the gripping surface, then heat transfer to the operator is reduced, but the gripping surface temperature cannot be reduced below ambient temperature
Solution Approach 1:
A thermoelectric cooling element is introduced as an intermediary between the motor housing and the insulating boot. This element actively removes heat from the gripping surface through thermoelectric cooling, enabling the surface temperature to be reduced below ambient temperature rather than merely limiting heat transfer as with passive insulation alone
Solution Approach 2:
The passive thermal insulation system is supplemented with an active thermoelectric cooling system. Instead of relying solely on the insulating boot's passive heat blocking capability, an electrical thermoelectric element is used to actively pump heat away from the gripping surface, achieving sub-ambient cooling
2Temperature
If air flow channels are added to the insulating boot to cool the housing surface, then heat dissipation is improved, but the system complexity increases
Solution Approach 1:
The thermoelectric cooling element is integrated within the insulating boot structure, extracting the cooling function from a separate system and incorporating it directly into the existing insulating component. This reduces overall system complexity while maintaining effective cooling performance
Solution Approach 2:
The insulating boot and cooling element are merged into a single integrated assembly. The cooling element is positioned within the boot structure, combining the insulation and active cooling functions into one unified component rather than separate systems
3Temperature
If a thermoelectric cooling system is implemented to actively cool the gripping surface, then the gripping surface temperature is reduced below ambient temperature, but energy consumption increases
Solution Approach 1:
The thermoelectric cooling element is positioned specifically at the gripping surface area where cooling is needed, rather than cooling the entire motor housing. This localized approach reduces the total energy consumption by focusing cooling power only on the critical heat transfer zone
Solution Approach 2:
The cooling system is designed to provide just enough cooling capacity to maintain the gripping surface at a comfortable temperature, rather than over-cooling the entire system. The thermoelectric element is sized and powered to deliver partial cooling action focused on the most critical area
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 thermoelectric cooling system effectively cools the gripping surfaces to below ambient temperature, reducing heat transfer to the operator and providing improved comfort during tool operation.
Implementation Method 1
A cooling system includes a cooling unit, such as a thermoelectric cooling unit, embedded in the rubber boot. The cooling unit is configured to cool the gripping surface of the front portion of the housing to below ambient temperature.
Implementation Method 2
The cooling unit is configured to cool the gripping surface of the front portion of the housing to below ambient temperature through thermal contact with the housing
Data Source
AI summary
A power tool includes a housing having a front portion and a handle portion. The front portion defines a cavity that encloses a motor and includes a gripping portion surrounding the cavity. An insulating cover is provided on the gripping portion of the housing and includes a gripping surface. A thermoelectric cooling unit is located between the gripping portion of the housing and the insulating cover. The thermoelectric cooling unit has a cold side positioned in thermal contact with an inner surface of the insulating cover and a hot side positioned in contact with an outer surface of the gripping portion of the housing. The thermoelectric cooling unit is configured to absorb thermal energy from the insulating cover via the cold side of the thermoelectric cooling unit and to release the absorbed heat via the hot side of the thermoelectric cooling unit.