Washer Steam Generator Cooling Cycles for Scale Prevention
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Solution Overview
Problem
Conventional washing machines with steam generators face the issue of scale accumulation due to calcium and magnesium components in water, requiring frequent cleaning.
Innovation Solution
A washing machine with a steam generator that includes a controller to measure operating time and simultaneously turn off the heater and open a water supply valve to cool the generator using cold water, preventing scale accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the steam generator operates continuously to generate steam for washing, then the washing capacity and temperature are improved, but scale accumulates on the internal surface of the pressure container and heater requiring frequent cleaning
Solution Approach 1:
The patent implements periodic cooling cycles during steam generator operation. The controller periodically opens the water supply valve to introduce cold water into the pressure container, creating alternating heating and cooling periods that prevent continuous scale deposition while maintaining washing productivity
Solution Approach 2:
The patent changes the temperature parameter dynamically by introducing cold water during operation. This creates temperature fluctuations that prevent scale accumulation by periodically lowering the temperature below the scale deposition threshold, while maintaining high temperature for steam generation during washing cycles
2Object-generated harmful factors
If the steam generator is cooled frequently to prevent scale accumulation, then scale prevention is improved, but the operating time and energy efficiency deteriorate
Solution Approach 1:
The patent applies partial cooling action by introducing cold water only for brief intervals during operation rather than continuous cooling. This partial action is sufficient to prevent scale accumulation while minimizing interruption to the steam generation process and maintaining overall operating time
Solution Approach 2:
The controller implements periodic cooling cycles where cold water is supplied at specific intervals during steam generator operation. This periodic approach prevents scale accumulation through repeated temperature cycling while maintaining high productivity during the heating phases
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
Effectively prevents scale accumulation in the steam generator by cooling it when the operating time exceeds a predetermined period, reducing maintenance needs.
Implementation Method 1
a heater for heating the water supplied through the water supply valve
Implementation Method 2
controlling the water supply valve and the heater so as to cool the steam generator
Data Source
AI summary
A washing machine having a steam generator, which prevents the accumulation of scale in the steam generator due to the long-term use thereof, and a method for controlling the same. The washing machine includes a water supply valve for supplying water to the inside of the steam generator therethrough so as to cool the steam generator when the operating time of the steam generator exceeds a predetermined time, and a controller for controlling the operation of a heater for heating the water supplied through the water supply valve.