Electric Hand Tool Cooling Circuit with Integrated Heat Exchanger
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Solution Overview
Problem
Existing electric hand tools with closed cooling circuits can't efficiently dissipate heat during prolonged operation, leading to overheating and requiring suspension until the cooling medium cools down, and they often lack adequate moisture protection.
Innovation Solution
Incorporating a heat exchanger in the cooling circuit to continuously withdraw heat from the cooling medium, ensuring effective cooling and protection against moisture with a closed and sealed design, including a bypass for temperature control and a pressure-generating pump for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed cooling circuit is used to protect against moisture, then protection class IPX4 or higher is achieved, but the cooling medium cannot sufficiently dissipate heat during prolonged operation
Solution Approach 1:
The cooling circuit is segmented into separate functional sections: a sealed internal circuit for moisture protection and an external heat exchanger system for heat dissipation. This allows the cooling medium to remain enclosed for protection while enabling controlled thermal exchange with the environment through the heat exchanger component.
Solution Approach 2:
The heat exchanger acts as an intermediary between the sealed cooling circuit and the external environment. It mediates heat transfer from the cooling medium to the surrounding air without requiring the cooling medium to contact external elements, thus maintaining both thermal management and moisture protection.
2Reliability
If a closed cooling circuit is used to seal off components, then protection class IPX4 or higher is achieved, but continuous operation over longer periods is limited due to heat accumulation
Solution Approach 1:
The heat exchanger is pre-integrated into the cooling circuit design, enabling heat dissipation capability to be established before operation begins. This preliminary thermal management infrastructure allows the system to maintain operational capacity throughout extended use periods without heat accumulation limiting continuous operation.
Solution Approach 2:
The cooling circuit with heat exchanger enables continuous heat removal throughout operation, maintaining the cooling medium's effectiveness continuously. This ensures uninterrupted thermal management during prolonged operation, allowing the electric hand tool to operate continuously without suspension for cooling down.
3Temperature
If open-air ventilation is used for cooling, then heat dissipation is effective, but protection against moisture is compromised
Solution Approach 1:
The heat exchanger serves as an intermediary that enables thermal exchange with the environment without requiring direct exposure of internal components to external air or moisture. Heat is transferred through the heat exchanger walls, allowing effective cooling while maintaining the sealed protective environment for electrical components.
Solution Approach 2:
The heat dissipation function is extracted from the internal housing and placed in an external heat exchanger component. This separation allows the main housing to remain fully sealed for moisture protection while the external heat exchanger handles all thermal exchange with the environment, eliminating the need for open ventilation paths.
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
Enables continuous operation of the electric hand tool under various environmental conditions, including rain or dampness, while maintaining a high level of protection against overheating and moisture, without the need for external cooling units.
Implementation Method 1
a heat exchanger (26) for cooling the cooling medium is provided in the cooling circuit
Implementation Method 2
The heat exchanger is advantageously made of a material that has good heat conduction
Implementation Method 3
The heat exchange is advantageously carried out by free convection. Alternatively, the heat exchange takes place by forced convection
Data Source
AI summary
The device (11) has an outer housing (12) in which a motor (16), drive (17), hammer mechanism (18) and control electronic system (19) are provided. A closed cycle cooling system (21) is provided for a coolant e.g. water, for cooling the motor, drive, hammer mechanism and control electronic system. A heat exchanger (26) is provided in the closed cycle cooling system for cooling the coolant, and is firmly connected with the device, where the heat exchanger is arranged at the outer housing. A pressure generating pump (31) is provided downstream to the closed cycle cooling system for the coolant.