Laundry Drum Motion Control for Washing Efficiency and Fabric Care
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Solution Overview
Problem
Laundry machines face inefficiencies in contaminant removal and mechanical action due to limitations in drum motion and friction dynamics, which affect washing performance and detergent dissolution.
Innovation Solution
A control method for laundry machines that varies drum driving motions, including rolling, tumbling, step, swing, scrub, and filtration motions, to optimize mechanical force and detergent distribution based on laundry type and soil level, improving washing efficiency and reducing washing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum is rotated at high speed to generate centrifugal force for maintaining laundry in an annular layer, then washing efficiency is improved, but mechanical damage to laundry increases
Solution Approach 1:
The drum rotation is performed periodically with alternating high-speed and low-speed phases. During high-speed phases, centrifugal force maintains laundry in an annular layer for effective washing. During low-speed phases, the drum rotates slowly to allow laundry to settle and reduce mechanical damage. This periodic alternation resolves the contradiction between washing efficiency and laundry protection.
Solution Approach 2:
Before high-speed rotation, the drum is rotated at low speed to preliminarily distribute and position the laundry. Water is introduced to wet the laundry and create a protective layer. This preliminary action prepares the laundry for high-speed washing while minimizing potential damage by ensuring proper positioning and hydration before intense mechanical action.
2Productivity
If the drum rotation is abruptly stopped during high-speed rotation, then detergent dissolution and mechanical action on laundry is enhanced, but vibration and noise increase
Solution Approach 1:
The drum undergoes periodic cycles of acceleration and deceleration. After high-speed rotation for a predetermined time, the drum is decelerated to a stop or reduced speed. This periodic action allows detergent to dissolve effectively during high-speed phases while providing vibration periods during deceleration that enhance mechanical action without continuous high vibration exposure.
Solution Approach 2:
The washing process maintains continuous useful action by immediately following the deceleration phase with another acceleration phase. The drum is accelerated back to high speed without prolonged idle time, ensuring that the washing action continues effectively while allowing brief intervals for detergent dissolution and reduced vibration during the transition phases.
3Productivity
If the drum is rotated at variable speeds with frequent acceleration and deceleration, then washing performance is improved, but energy consumption increases
Solution Approach 1:
The drum follows a periodic speed pattern with high-speed washing phases alternating with low-speed transition phases. During high-speed phases, washing performance is maximized. During low-speed phases, energy consumption is reduced. The periodic nature allows the system to recover and prepare for the next high-speed phase efficiently, balancing performance and energy use.
Solution Approach 2:
The variable speed operation maintains continuous washing action by ensuring that deceleration and acceleration phases are minimized in duration. The drum transitions quickly between speed states, maintaining productive washing action throughout the cycle. This continuity ensures that energy is not wasted in prolonged idle periods while still achieving the performance benefits of variable speed operation.
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
Enhances washing performance by optimizing mechanical force and detergent distribution, leading to improved contaminant removal and reduced washing time, while minimizing laundry damage and energy consumption.
Implementation Method 1
the chamber is rotated at high speed, wherein the wash water and clothes are formed and maintained in an annular layer with the centrifugal force acting on the clothes and wash water being greater than the force of gravity
Implementation Method 2
a pump is operated and the chamber is rotated, so that wash water is introduced into the interior of the rotating chamber
Implementation Method 3
the rotating chamber is quickly and abruptly braked to an intermediate speed below the speed necessary to maintain the annular layer of the clothes and wash water
Implementation Method 4
the rotating chamber is quickly and abruptly braked to an intermediate speed
Data Source
Figure 1~2
Figure 3a~3a(g)
Figure 3b~3b(i3)
AI summary
A laundry machine and a control method thereof are provided in which laundering ability may be improved while also improving efficiency and noise/vibration. The laundry machine employs a plurality of drum motions by varying drum rotational speed, drum rotational direction, and drum starting and stopping point, to provide different motion of laundry items in the drum.