Heating means, pump with such a heating means and water-conducting domestic appliance
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Solution Overview
Problem
Existing heating means for water in domestic appliances, such as dishwashers and washing machines, face challenges in rapidly and reliably heating water while ensuring operational safety and preventing overheating.
Innovation Solution
A heating means with a tubular holder and multiple heating conductor tracks, where some tracks extend above the residual water level to intentionally overheat and fail, acting as a self-destruct mechanism, thereby preventing larger-scale overheating and ensuring safety, while others below the water level maintain efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating conductor tracks are arranged to extend above the residual water level, then safety against overheating is improved through self-destruct mechanism, but the heating efficiency and water heating speed may be reduced
Solution Approach 1:
The heating conductor tracks are segmented into two functional groups: those extending below the residual water level for efficient heating, and those extending above for safety. This segmentation allows each segment to serve its specific purpose without compromising the other.
Solution Approach 2:
Different regions of the heating conductor tracks have different functions: the portion below water level is optimized for heat transfer to water, while the portion above water level is optimized for overheating and self-destruct to prevent catastrophic failure. This local differentiation resolves the contradiction between heating efficiency and safety.
2Reliability
If heating conductor tracks extend above the residual water level, then a self-destruct safety mechanism is created, but the overall heating capacity and energy efficiency may be reduced
Solution Approach 1:
The potential harm of uncontrolled overheating is converted into a beneficial self-destruct mechanism. By allowing specific heating conductor tracks to fail safely above the water level, the system prevents more severe damage while maintaining acceptable energy efficiency through the majority of tracks remaining functional below water level.
3Productivity
If all heating conductor tracks are arranged below the residual water level, then heating efficiency is maximized, but the risk of overheating and catastrophic failure increases
Solution Approach 1:
The heating conductor tracks extending above the residual water level serve as a preliminary safety measure that activates before catastrophic overheating can occur. This preliminary anti-action prevents the harmful effect of uncontrolled overheating by providing a fail-safe mechanism.
4Device complexity
If heating means is configured for horizontal operation, then the pump and heating system can be integrated compactly, but the water level management and heating efficiency become more complex
Solution Approach 1:
The heating chamber is designed to maintain a residual water level that creates a stable thermal environment for the heating conductor tracks. The horizontal configuration with defined water level ensures that the heating system operates at a stable thermal potential, simplifying water level management despite the compact integration.
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 configuration allows for rapid water heating while incorporating a safety mechanism to prevent overheating and potential appliance damage, ensuring operational reliability and safety by selectively destroying only the protruding heating conductor tracks.
Implementation Method 1
A plurality of heating conductors or heating conductor tracks are arranged or deposited on the holder, these being connected together in series
Implementation Method 2
A pump rotor, in particular an appropriate impeller, for the pump, with which water is conveyed while also being heated, is then arranged within this heating means or heating chamber
Data Source
AI summary
A heating means installed in a pump for heating water during pumping has a tubular cylindrical holder that defines a heating chamber for the water. On the outside of the holder, a plurality of heating conductor tracks are connected together in series. The heating means is configured for operation of the pump in the horizontal state, such that its longitudinal axis extends horizontally. In this horizontal state, the heating means has a residual water level as a horizontal plane that lies roughly in the lower third. Apart from two heating conductor tracks, the heating conductor tracks extend below this residual water level, while said two heating conductor tracks extend above the residual water level. In the absence of cooling water on the inner surface of the heating chamber, they can overheat more quickly and be locally destroyed as an emergency safety device before the entire heating means is at risk of overheating.