Washing Drum Acceleration Control for Laundry Load Balancing
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Solution Overview
Problem
Drum-type washing machines often experience unbalancing of laundry during spinning, leading to noise and vibration due to tangling, which requires effective balancing methods during wash and rinse cycles to prevent unbalanced conditions.
Innovation Solution
A method and washing machine design that includes supplying wash water mixed with detergent, rotating the drum to repeatedly accelerate and decelerate the laundry, and using a control unit to balance the load by measuring the unbalanced degree and adjusting the drum's rotation to ensure even distribution before the spin cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum is rotated at high speed for spinning, then dehydration efficiency is improved, but noise and vibration increase due to laundry unbalancing
Solution Approach 1:
The patent performs balancing action before the high-speed spin cycle by rotating the drum at a low speed (e.g., 30-60 rpm) for a predetermined time (e.g., 5-10 minutes) to redistribute laundry evenly. This preliminary balancing prevents unbalancing during subsequent high-speed spinning, allowing dehydration efficiency to improve while keeping noise and vibration within acceptable levels.
2Stability of the object's composition
If balancing is performed by stopping and redistributing laundry, then laundry distribution is improved, but washing time increases
Solution Approach 1:
The patent implements periodic balancing during the wash cycle by intermittently rotating the drum in a specific direction (e.g., clockwise for 30 seconds, then counter-clockwise for 30 seconds) multiple times. This periodic action gradually redistributes laundry without requiring the drum to stop completely, thereby improving laundry distribution while minimizing additional washing time.
Solution Approach 2:
The patent performs balancing during the wash cycle or rinse cycle before the spin cycle begins. By allocating a specific时间段 (e.g., last 5-10 minutes of wash cycle) for balancing, the patent ensures laundry is properly distributed before high-speed spinning, avoiding the need for extended balancing time that would significantly increase total washing time.
3Productivity
If the drum rotates continuously without stopping, then washing efficiency is improved, but laundry unbalancing occurs
Solution Approach 1:
The patent employs periodic directional rotation during the wash cycle, where the drum rotates clockwise for a set time (e.g., 30 seconds), then counter-clockwise for a set time (e.g., 30 seconds), repeating this pattern multiple times. This periodic bidirectional rotation maintains washing efficiency by keeping the drum in motion while preventing laundry from settling in one position, thus maintaining stable laundry distribution.
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 approach effectively balances the laundry, reduces noise and vibration during spinning, allows for direct main-spinning if the laundry is balanced, and shortens overall washing time by integrating balancing into wash and rinse cycles.
Implementation Method 1
performing washing or rinsing by repeatedly falling laundry within a drum provided in the tub containing the wash water by rotating the drum
Data Source
AI summary
A method for washing laundry and a washing machine, in which balancing of the laundry load is effectively carried out. The method for washing includes supplying wash water mixed with a detergent, spinning or rinsing the laundry by rotating the washing machine drum in which the laundry is located, thereby causing the laundry to be repeatedly lifted within and then fall towards the bottom of the drum. The method further involves balancing the laundry by repeatedly accelerating and decelerating the drum. The wash water is then drained.