Steam Dryer Water Supply Sensing via Pump Voltage Feedback
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Solution Overview
Problem
Steam laundry machines are prone to breakage due to insufficient water supply, which can lead to overheating of the steam generator and inadequate steam production, resulting in inefficient drying and potential machine damage.
Innovation Solution
A control method that monitors the water supply by measuring voltage values when the pump is operated in both clockwise and counterclockwise directions to determine if water is normally supplied to the steam generator, and adjusts reference voltage values based on measured values to ensure proper water flow and prevent pump failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water supply is not monitored, then the machine can operate continuously, but the steam generator overheats and breaks
Solution Approach 1:
The control method performs preliminary water supply verification by measuring pump voltage before steam generation begins. The system checks whether the voltage value falls within a predetermined range indicating proper water supply, and only permits steam generation when the check passes. This preliminary action prevents overheating and breakage before they can occur.
Solution Approach 2:
The system continuously monitors pump voltage and compares it against reference values to determine water supply status. When abnormal voltage indicating water shortage is detected, the control unit immediately stops steam generation and activates a water supply prompt. This feedback loop ensures the steam generator only operates when adequate water is supplied, preventing overheating while providing real-time monitoring.
2Reliability
If water supply monitoring is added, then steam generator breakage is prevented, but the control system becomes more complex
Solution Approach 1:
The pump motor serves dual purposes: it both supplies water and provides its own monitoring signal through its voltage consumption. The control unit measures the voltage across the pump motor terminals, which naturally varies based on water supply conditions (normal range 20-40V when water flows, 0-20V when blocked). This self-service approach uses the pump's inherent electrical characteristics for monitoring without adding separate sensors, maintaining simplicity while ensuring reliability.
3Measurement precision
If pump voltage is measured to detect water supply, then water supply status is accurately detected, but additional measurement components are required
Solution Approach 1:
The voltage measurement circuit serves multiple functions simultaneously: it monitors water supply status, protects the steam generator from overheating, controls pump operation timing, and provides diagnostic information. By making the measurement system multi-functional, the patent achieves high measurement precision for water supply detection without proportionally increasing overall system complexity, as the same measurement infrastructure supports multiple critical functions.
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 pump breakage by ensuring adequate water supply to the steam generator, maintaining efficient steam production, and extending the machine's lifespan by preventing overheating and improper operation.
Implementation Method 1
a pump, which pumps water from a water supply source to the steam generator
Implementation Method 2
The water is changed into steam by the steam generator
Implementation Method 3
a steam generator to generate steam
Data Source
AI summary
The present invention relates to a control method of a laundry machine. The control method includes inputting a command to drive the steam laundry dryer, and determining whether water is supplied to a steam generator of the steam laundry dryer. According to the control method of the steam laundry dryer, it is possible to effectively remove wrinkles from clothes and to prevent the breakage of the steam laundry dryer.