Laundry Drum Dryness Detection for Stable Dehydration Drying
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Solution Overview
Problem
Laundry treating apparatuses face challenges in accurately determining the presence of water-filled laundry, leading to inefficient dehydration drying operations and potential maldistribution during high-speed rotation, which can cause vibration and noise.
Innovation Solution
A method that determines the dryness level and water content of laundry in the drum by measuring inertia and current consumption, allowing for controlled dehydration drying operations based on these determinations, including steps to eliminate water-filled laundry through forward and reverse rotations or water supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dehydration drying is performed at high speed without detecting water-filled laundry, then productivity is improved, but vibration and noise increase due to maldistribution
Solution Approach 1:
The system performs preliminary detection of water-filled laundry before initiating high-speed dehydration drying. By measuring the dryness level and identifying water-filled items in advance, the system can take preparatory actions (such as removing or repositioning water-filled laundry) to prevent maldistribution and subsequent vibration during high-speed rotation, thus enabling productive dehydration without harmful effects.
Solution Approach 2:
The system continuously monitors the dryness level of laundry during the dehydration drying process and provides feedback to the control unit. This feedback mechanism allows the system to adjust the dehydration drying parameters in real-time, maintaining optimal performance while preventing the conditions that lead to vibration and noise, thereby resolving the contradiction between productivity and harmful factors.
2Device complexity
If dehydration drying is performed without accurate detection of water-filled laundry, then device complexity is reduced, but reliability deteriorates due to potential maldistribution
Solution Approach 1:
The system replaces complex mechanical detection mechanisms with electrical measurement methods. By measuring the dryness level through electrical current consumption during drum rotation, the system achieves reliable detection of water-filled laundry without requiring complex mechanical sensors or detection devices, thus maintaining reliability while minimizing device complexity.
Solution Approach 2:
The system utilizes the existing drum rotation mechanism and motor current measurement capabilities to detect water-filled laundry, rather than adding separate detection systems. The motor's current consumption during rotation serves dual purposes: driving the drum and providing detection data, thereby achieving reliable detection without increasing device complexity.
3Productivity
If the drum is accelerated to high RPM without checking dryness level, then productivity is improved, but harmful factors increase due to maldistribution of water-filled laundry
Solution Approach 1:
The system performs preliminary measurement of the dryness level and identification of water-filled laundry before accelerating the drum to high RPM for dehydration drying. This preliminary action ensures that water-filled items are detected and appropriately handled before high-speed rotation begins, preventing maldistribution and enabling productive dehydration without harmful effects.
Solution Approach 2:
The system takes preliminary anti-action by detecting and addressing water-filled laundry before high-speed rotation occurs. By identifying water-filled items through dryness level measurement and taking corrective actions (such as removing or repositioning them) before acceleration, the system prevents the maldistribution that would otherwise occur during high-speed dehydration, thus enabling high productivity without harmful factors.
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 method ensures effective dehydration drying by accurately identifying water-filled laundry and adjusting the drying process, reducing maldistribution and associated vibrations, thereby improving the operational efficiency and reliability of laundry treating apparatuses.
Implementation Method 1
measuring inertia of the laundry in the drum based on acceleration of the drum to the reference RPM
Implementation Method 2
a dryer performs a dehydration drying operation of removing moisture from the laundry
Data Source
AI summary
Control of a laundry treating apparatus, in which at least one of a dryness level and a percentage of water content of laundry received in a drum of the laundry treating apparatus is determined. A determination is made as to whether the laundry in the drum includes water-filled laundry based on at least one of the dryness level and the percentage of water content of the laundry in the drum. Dehydration drying of the laundry in the drum is controlled based on the determination of whether the laundry in the drum includes water-filled laundry.