Steam Generator Drain Control for Lime-Safe Washing Machines
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Solution Overview
Problem
Washing machines with steam generators face issues of water stagnation leading to lime accumulation, causing heater and water level sensor malfunctions, which can result in fire hazards due to excessive heater operation.
Innovation Solution
A washing machine with a steam generator that includes a drain pipe and a controller to manage water levels, allowing for the drainage of stored water before or after steam generation, and alternating between draining and refilling to prevent contamination and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water is stored in the steam generator for steam generation, then steam supply function is enabled, but water stagnation causes lime accumulation on heater and water level sensor leading to malfunction
Solution Approach 1:
The patent applies preliminary action by draining water from the steam generator before the washing machine is used for an extended period. The control unit automatically detects when the washing machine has been idle for a predetermined time and initiates water drainage, preventing lime accumulation before it can damage the heater or water level sensor. This proactive measure maintains system reliability while preserving steam generation capability.
2Device complexity
If water is retained in the steam generator during long periods, then steam generator structure is simple, but lime component accumulates on heater causing fire hazard
Solution Approach 1:
The control unit performs preliminary water drainage when the washing machine is detected to be idle for a predetermined time, removing the water that would otherwise stagnate and cause lime accumulation. This prevents the heater from malfunctioning and eliminates the fire hazard before it can occur, while maintaining the simplicity of the steam generator structure.
3Measurement precision
If water level sensor terminals accumulate lime, then water level detection fails, but heater continues operation causing excessive steam generation
Solution Approach 1:
The control unit initiates water drainage before lime accumulation can significantly impact the water level sensor terminals. By proactively draining water during idle periods, the system prevents lime from coating the sensor terminals and causing detection failures, thereby avoiding the cascade effect of excessive heater operation and potential fire hazards.
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
Prevents contamination and damage within the steam generator, reduces water consumption by reusing drained steam water for laundry washing and rinsing, and minimizes the risk of malfunctions and fires.
Implementation Method 1
a steam generator (400) which generates steam
Implementation Method 2
The drain pipe (450) is connected to a drain pump (610)
Data Source
AI summary
Disclosed are a structure of a washing machine having a steam generator (400), which drains remaining steam water, and a method for controlling the same. The washing machine includes a steam generator (400) including a case forming a space for storing water to generate steam, and a drain pipe (450) connected to the case (410) for draining the stored water; a valve (451) installed on the drain pipe (450); and a controller for controlling the steam generator and the drain opening/closing part valve.