Washing Machine Steam Refresh to Reduce Delicate Fabric Damage
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Solution Overview
Problem
Washing machines often struggle to balance the delicate task of cleaning delicate fabrics like wool, silk, or cashmere without causing damage, as high temperatures, water, detergent, and mechanical compression can lead to undesired consequences such as shrinkage or felting, while also ensuring proper refreshing of laundry without stains or odors.
Innovation Solution
A method for controlling a washing machine that involves supplying water to a temperature between 60°C and 95°C to produce steam, which is then introduced into a rotatable drum with laundry, while maintaining a drum speed that keeps the laundry attached to the inner wall, thereby minimizing mechanical damage and ensuring effective refreshing without water contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If water and detergent are used to clean delicate fabrics, then cleaning effectiveness is improved, but fabric damage such as shrinkage and felting increases
Solution Approach 1:
The invention extracts water from the cleaning process and replaces it with steam. The steam is generated in a water reservoir, heated to produce vapor, and then introduced into the drum to clean the laundry without direct water contact, thereby eliminating shrinkage and felting while maintaining cleaning effectiveness
Solution Approach 2:
The invention changes the physical state of water from liquid to gas (steam). By heating water to produce steam and controlling the steam temperature and introduction rate, the cleaning process achieves effective stain removal without the harmful effects of liquid water and detergent on delicate fabrics
2Productivity
If drum rotation speed is increased to refresh laundry, then cleaning efficiency is improved, but mechanical compression and fabric damage increase
Solution Approach 1:
The invention replaces mechanical tumbling action with steam-based cleaning. Instead of relying on high-speed drum rotation to agitate and clean laundry, the system introduces steam that penetrates and cleans fabrics gently, allowing the drum to rotate at low speeds without causing mechanical damage
Solution Approach 2:
The invention uses periodic introduction of steam into the drum combined with gentle drum rotation. The steam is supplied in controlled intervals, allowing penetration and cleaning action without continuous mechanical stress, thereby refreshing laundry effectively while minimizing compression
3Manufacturing precision
If high temperature is used to eliminate stains, then cleaning effectiveness is improved, but fabric damage such as shrinkage and felting increases
Solution Approach 1:
The invention utilizes the phase transition of water from liquid to gas (steam) to achieve cleaning. The steam form allows high-temperature cleaning action without the liquid water that causes shrinkage and felting. The steam penetrates fabrics effectively to remove stains while the gaseous state avoids the harmful effects of liquid water exposure
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 provides a gentle yet effective cleaning process that minimizes fabric damage and maintains the quality of delicate fabrics by using steam at low temperatures and controlled drum speeds, ensuring proper care and refreshing efficiency.
Implementation Method 1
heating the water supplied in the tub to a temperature between 60°C and 95°C to produce steam
Implementation Method 2
rotating the drum at a speed at which laundry inserted in the drum at least partially remains attached to the inner wall of the drum
Data Source
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AI summary
The present invention relates to a method to control operation of a washing machine, the washing machine including a rotatable drum having an inner surface and a tub housing the drum and connected to an external water source, the method comprising : supplying water into the tub from the external water source till a level at which water does not enter into the drum; heating the water supplied in the tub to a temperature between 60°C and 95°C to produce steam; supplying steam to the drum while keeping the water temperature between 60°C and 95°C; and rotating the drum at a speed at which laundry inserted in the drum at least partially remains attached to the inner wall of the drum for the majority of the time during which the steam is supplied to the drum.