Method for controlling spin-drying operation of washing apparatus
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Solution Overview
Problem
Conventional spin-drying operations in washing apparatuses are inefficient due to fixed rotation times and inadequate water removal, leading to prolonged cycles and energy wastage, especially when laundry is not uniformly distributed, causing excessive vibration and noise.
Innovation Solution
A method that dynamically adjusts the spin-drying time based on the laundry's condition by re-executing fabric dispersion steps and varying the drum's rotation speed, including preliminary and main spin-drying phases, to ensure uniform distribution and complete water removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates at high speed for a fixed time to perform spin-drying, then water removal function is provided, but the operation time becomes excessively long when fabric dispersion is repeated multiple times
Solution Approach 1:
The patent applies dynamics by making the spin-drying time variable rather than fixed. The control unit dynamically adjusts the spin-drying operation time based on the number of times fabric dispersion has been executed. When fabric dispersion is executed multiple times indicating poor fabric distribution, the spin-drying time is extended accordingly. This dynamic adjustment ensures adequate water removal while adapting to actual fabric distribution conditions, resolving the contradiction between maintaining water removal efficiency and avoiding excessive operation time.
2Productivity
If the drum rotates at high speed to remove water from laundry, then water removal function is achieved, but severe vibration and noise occur due to eccentric fabric distribution
Solution Approach 1:
The patent applies preliminary action by executing fabric dispersion operations before initiating high-speed spin-drying. The control unit monitors fabric distribution through eccentricity detection and performs fabric dispersion (slowing the drum and redistributing fabric) in advance of the spin-drying phase. This preliminary fabric redistribution prevents severe eccentric distribution during high-speed rotation, thereby reducing vibration and noise while maintaining water removal efficiency.
3Duration of action of stationary object
If the spin-drying operation is terminated after a pre-fixed time, then operation duration is controlled, but water may not be sufficiently removed from laundry
Solution Approach 1:
The patent applies feedback by using eccentricity detection to monitor fabric distribution during spin-drying operation. The control unit continuously senses eccentricity levels and uses this feedback to determine whether to extend or terminate the spin-drying operation. When eccentricity indicates poor fabric distribution, the system feedbacks to extend spin-drying time to ensure adequate water removal. This feedback mechanism ensures operation duration is sufficient for complete water removal while avoiding unnecessary extended operation when fabric distribution is already good.
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 reduces spin-drying time, ensures thorough water removal, and conserves energy by adapting to the laundry's condition, preventing prolonged and inefficient cycles.
Implementation Method 1
the spin-drying operation is a process in which water contained in the laundry is removed as the laundry that has undergone the washing and rinsing operations is rotated at a high speed along with the drum
Data Source
AI summary
A method for controlling a spin-drying operation of a washing apparatus includes a laundry dispersing step of dispersing the laundry inside a drum by accelerating the drum, a spin-drying step including detecting the eccentricity of the drum, and performing spin-drying by rotating the drum to a spin-drying RPM. The laundry dispersing step is re-executed when the eccentricity exceeds a reference eccentricity, and in the spin-drying step, a rotation time during which the drum rotates at the spin-drying RPM is adjusted according to a spin-drying degree. The spin-drying degree is measured after a point in time at which the eccentricity exceeds the reference eccentricity.