Ball-Balanced Drum Washing Control for Faster Spin Drying
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Solution Overview
Problem
Conventional drum type washing machines with ball balancers face challenges in reducing spin-drying time and detecting vibrations accurately, especially when the rotary tub is not accelerated, leading to increased spin-drying time and potential machine vibration issues.
Innovation Solution
A drum type washing machine with ball balancers and a controlling method that includes a controller to detect eccentricity and vibration by adjusting rotation speeds, decelerating the rotary tub to a specific speed for balanced operation, and using command voltage analysis to detect vibrations, allowing for efficient spin-drying and vibration detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotary tub is rotated at constant speed for a predetermined period to estimate ball balancer positions, then the positions of ball balancers can be estimated, but water continues to rise along the outside of the rotary tub during spin-drying acceleration, increasing spin-drying time
Solution Approach 1:
The patent applies preliminary action by rotating the rotary tub at constant speed before spin-drying acceleration to estimate ball balancer positions and determine the optimal acceleration timing. This preliminary rotation ensures that ball balancers are in favorable positions before high-speed acceleration, preventing vibration while enabling subsequent rapid spin-drying operation.
Solution Approach 2:
The patent uses feedback by detecting the position of ball balancers during constant-speed rotation and using this information to determine the optimal timing for spin-drying acceleration. The control unit adjusts the acceleration timing based on the detected ball balancer positions, creating a closed-loop control system that optimizes both vibration prevention and spin-drying efficiency.
2Reliability
If the rotary tub is accelerated to detect vibration using rotation speeds before and after acceleration, then vibration can be detected during acceleration, but vibration generation cannot be detected when the rotary tub is not accelerated
Solution Approach 1:
The patent applies universality by implementing a dual-mode vibration detection system that can detect vibrations both during acceleration (using rotation speed changes) and during constant-speed operation (using eccentricity detection). This multi-functional detection system ensures comprehensive vibration monitoring regardless of the operational state of the rotary tub.
Solution Approach 2:
The patent uses parameter changes by switching between different detection methods based on the operational state. During acceleration, the system uses rotation speed change parameters to detect vibration. During constant-speed operation, the system switches to eccentricity detection parameters, allowing versatile vibration detection across different operating conditions.
3Productivity
If the rotary tub is rotated at high speed during spin-drying, then spin-drying efficiency is improved, but laundry collects on the bottom of the rotary tub causing eccentricity and vibration
Solution Approach 1:
The patent applies preliminary action by rotating the rotary tub at constant speed before spin-drying acceleration to allow laundry to distribute uniformly and ball balancers to position themselves favorably. This preliminary phase establishes a balanced state before high-speed spin-drying begins, preventing excessive vibration while maintaining spin-drying efficiency.
Solution Approach 2:
The patent uses anti-weight by employing ball balancers that move freely inside the rotary tub to counterbalance the eccentricity caused by unevenly distributed laundry. The ball balancers automatically position themselves to offset the center of gravity deviation, maintaining dynamic balance during high-speed spin-drying 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
The solution reduces spin-drying time and effectively detects vibrations, enhancing the operational efficiency and reliability of the washing machine by optimizing the rotation speed control and vibration detection.
Implementation Method 1
the conventional drum type washing machine having ball balancers performs a spin-drying process using a centrifugal force generated by the high-speed rotation of the rotary tub
Implementation Method 2
the rotary tub, in which the laundry is placed, is horizontally disposed, with the result that the rotary tub is rotated at high speed, while laundry is collected on the bottom of the rotary tub due to gravity
Data Source
AI summary
Disclosed herein are a drum type washing machine having ball balancers and a controlling method of the same that are capable of reducing spin-drying time. The drum type washing machine having ball balancers according to the present invention includes a rotary tub having the ball balancers mounted therein, a wash motor to rotate the rotary tub, and a controller to detect the eccentricity amount of the rotary tub while controlling the rotary tub to be rotated at a first rotation speed, and, when the rotation speed of the rotary tub reaches a second rotation speed, to control the rotary tub, such that the rotary tub is decelerated to a third rotation speed and a drainage process is carried out.