Laundry Drum Wetting Sequence for Faster Detergent Dosing
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Solution Overview
Problem
Existing laundry washing machine wetting methods are time-consuming, do not guarantee homogeneous wetting of laundry, and result in excessive detergent usage due to inefficient water and detergent distribution.
Innovation Solution
A method involving filling the washing tub with a first quantity of clean water exceeding the minimum needed for complete wetting, followed by draining excess water and adding detergent, with optional rotation to extract water and optimize detergent usage, utilizing a water storage area for subsequent phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the known wetting method is used with successive water introduction and draining steps, then the laundry is wetted, but the wetting phase lasts a long time
Solution Approach 1:
The patent applies preliminary action by determining the exact water quantity needed for complete laundry wetting before the wetting phase begins. The control unit calculates the minimum water quantity based on laundry weight and type, then introduces exactly this amount directly into the tub, eliminating the need for successive approximation steps and water draining operations used in known methods.
2Reliability
If the known wetting method introduces excess water to fill hollow space, then complete wetting is achieved, but detergent is wasted mixing with excess water
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water quantity parameter to match exactly the minimum needed for complete laundry wetting. The control unit calculates this optimal quantity based on laundry characteristics and introduces only this amount, avoiding the excess water introduction in known methods that causes detergent to mix with unnecessary water and be wasted.
3Reliability
If the known wetting method uses successive water addition and draining, then water level is controlled, but homogeneous wetting is not guaranteed
Solution Approach 1:
The patent applies preliminary action by pre-calculating the exact water quantity needed for complete and homogeneous laundry wetting based on laundry weight and type. This minimum quantity is introduced directly into the tub in one operation, ensuring uniform water distribution and homogeneous wetting from the start, rather than using successive addition and draining steps that may create non-uniform wetting patterns.
Data Source
AI summary
The present invention relates a to a method for washing laundry in a laundry washing machine comprising a washing tub external to a rotatable washing drum suited to receive laundry; the method comprises loading laundry into the washing drum and a laundry wetting phase for this laundry. The wetting phase comprises the steps of: —filling the washing tub with a first quantity of clean water at least equal to the quantity of water necessary to wet the loaded laundry completely, so as to obtain the complete wetting of the loaded laundry; —if a quantity of free water is present in the washing tub, externally to the laundry, draining from the washing tub this quantity of free water; —adding a given quantity of detergent to the loaded laundry.