Laundry washing machine with improved washing performances
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Solution Overview
Problem
Existing laundry washing machines often fail to effectively distribute washing and rinsing solutions throughout the drum, leading to incomplete wetting of laundry, high water and additive consumption, and bulky additive housing that occupies valuable space.
Innovation Solution
A laundry washing machine with an electric additive treating device mounted on the drum generates a washing and rinsing solution directly within the drum, using an inlet pump to mix water with additives, reducing the need for external conduits and additive housing, and employing wireless power transmission for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the washing/rinsing liquid enters the drum through its perforated walls, then the liquid can reach the laundry, but the drum walls obstruct the path of the washing/rinsing liquid towards the laundry contained in the drum, particularly the part positioned in the central part of the drum
Solution Approach 1:
The invention extracts the liquid entry function from the drum walls by introducing a dedicated liquid supply device mounted on the drum that delivers washing/rinsing liquid directly to the laundry without requiring the liquid to pass through the drum's perforated walls, thereby eliminating the obstruction problem
Solution Approach 2:
The liquid supply device acts as an intermediary between the water source and the laundry, directly delivering the washing/rinsing liquid to the laundry surfaces without the drum walls interfering with the liquid path
2Quantity of substance
If the washing/rinsing liquid is sprayed directly towards the loading/unloading opening of the drum, then the liquid can reach the laundry, but the laundry positioned close to the loading/unloading opening obstructs the path of the washing/rinsing liquid towards the part of the laundry positioned in the inner and in the rear part of the drum
Solution Approach 1:
The liquid supply device incorporates multiple nozzles positioned at different locations and orientations on the drum surface, each directed to deliver washing/rinsing liquid to specific zones of the laundry, ensuring comprehensive coverage without obstruction from laundry positioned near the loading/unloading opening
3Quantity of substance
If the washing/rinsing solution is produced in the additive housing and then taken to the laundry via a conduit, then the additive can be mixed with water, but the amount of washing/rinsing liquid must be relatively high to fill the conduit and optionally the bottom of the tub, causing high consumption of water and washing/rinsing additive
Solution Approach 1:
The invention extracts the liquid mixing function from the external additive housing by incorporating a compact mixing chamber directly on the drum, eliminating the need for large-volume conduits and reducing the total amount of washing/rinsing liquid required
Solution Approach 2:
The liquid supply device utilizes the radial and axial dimensions of the drum surface to position nozzles and mixing chambers in three-dimensional space, enabling direct delivery of concentrated washing/rinsing liquid to the laundry without requiring large volumes to fill horizontal conduits or tub bottom spaces
4Quantity of substance
If the washing/rinsing additive is mixed to the water in the additive housing which is quite far away from the laundry, then the additive can be prepared in advance, but there is risk that the washing/rinsing additive could lose part of its washing/rinsing effect before reaching the laundry, requiring using a relative high amount of additive
Solution Approach 1:
The mixing chamber on the drum enables preliminary mixing of the washing/rinsing additive with water immediately before the liquid contacts the laundry, ensuring the additive is activated at the optimal moment without prolonged exposure to conditions that could reduce its effectiveness
Solution Approach 2:
The mixing chamber acts as an intermediary that facilitates immediate mixing of the additive with water right at the point of application, eliminating the long transport path through conduits that allows additive degradation
5Quantity of substance
If an additive housing and its water feeding circuit are provided, then the additive can be stored and delivered to the drum, but the additive housing and its water feeding circuit is relatively complex and bulky, taking up a relative high space within the cabinet which could otherwise be used for increasing the load capacity of the machine
Solution Approach 1:
The invention merges the additive storage, water mixing, and liquid delivery functions into a single integrated liquid supply device mounted on the drum, eliminating the need for a separate bulky additive housing and complex water feeding circuit within the cabinet
Solution Approach 2:
The liquid supply device performs multiple functions: it stores the washing/rinsing additive, mixes it with water, and delivers the washing/rinsing liquid directly to the laundry, replacing the need for separate additive housing, water feeding circuit, and conduit system
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 solution ensures effective treatment of all laundry with reduced water and additive consumption, increases load capacity, and enhances machine reliability by eliminating the need for bulky external additive housing and sliding contacts.
Implementation Method 1
a wireless power transmitter unit (62) associated to the washing tub (30) and arranged for wireless transmitting electric power to a wireless power receiver unit (63) mounted on the drum
Implementation Method 2
an electric additive treating device mounted on the drum and configured for treating a washing and/or rinsing additive loaded within the drum in such a way to generate within the drum a solution of washing and/or rinsing additive and water
Data Source
AI summary
A laundry washing machine having a cabinet, a washing tub housed inside the cabinet, a drum rotatably housed inside the cabinet, an electric additive treating device mounted in/on the drum and configured for treating a washing and/or rinsing additive loaded within the drum in such a way to generate within the drum a solution of washing and/or rinsing additive water. A method for operating such a laundry washing machine is also provided.