Detergent Drawer Layout for Brine-Safe Water-Softening Washers
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Solution Overview
Problem
The integration of a salt reservoir on the back of the detergent drawer in high-end front-loading laundry washing machines leads to accidental brine leakage into the washing tub, causing rusting of metal parts and increasing production costs due to a complex detergent dispenser structure.
Innovation Solution
A redesigned detergent dispenser with a detergent drawer that has detergent and regeneration-agent compartments arranged transversally, allowing them to be accessed simultaneously, and a separate basin-shaped bottom portion for each compartment to prevent brine from entering the washing tub, along with a drawer flush circuit for flushing and regenerating ion-exchange resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the salt reservoir is integrated on the back of the detergent drawer, then the water softening function is improved, but brine leakage causes rusting of metal parts and increases production costs due to complex structure
Solution Approach 1:
The patent extracts the salt reservoir from the detergent drawer assembly and places it in a separate, dedicated location within the washing machine. This separation eliminates the risk of brine leakage from the detergent drawer while maintaining the water softening function. The salt reservoir is now an independent component with its own containment structure, preventing harmful brine from affecting other parts of the machine.
Solution Approach 2:
The patent introduces a separate brine collection chamber as an intermediary between the salt reservoir and the washing tub. This intermediary structure captures and contains brine, preventing it from leaking into the washing tub and causing rusting of metal parts. The brine collection chamber acts as a buffer zone that manages the harmful byproduct of the water softening process.
2Adaptability or versatility
If the salt reservoir is integrated on the back of the detergent drawer, then the water softening function is improved, but the detergent dispenser structure becomes complex and production costs increase
Solution Approach 1:
The patent extracts the salt reservoir from the detergent drawer assembly, simplifying the detergent dispenser structure. By removing the integrated salt reservoir, the detergent drawer becomes a simpler component dedicated solely to detergent storage and dispensing. The salt reservoir is relocated to a separate location, reducing the structural complexity of the detergent dispenser while maintaining the water softening capability.
3Volume of stationary object
If detergent and regeneration-agent compartments are arranged vertically, then space is saved, but brine can accidentally enter the washing tub during drawer extraction
Solution Approach 1:
The patent extracts the regeneration-agent compartment from the vertical arrangement with detergent compartments and places it in a separate, dedicated location. This separation allows the detergent drawer to be designed with compartments that are less prone to brine leakage during extraction. The regeneration-agent compartment is now an independent structure with its own containment, preventing brine from accidentally entering the washing tub.
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
Prevents brine from entering the washing tub, reducing rusting and extending the lifespan of machine components, while simplifying the detergent dispenser structure and reducing production costs.
Implementation Method 1
the water softening device is generally internally provided with a given amount of ion-exchange resins which are capable of restraining the calcium and magnesium ions (Ca++ and Mg++) dissolved in the water flowing through the same water softening device
Implementation Method 2
Salt water, in fact, is able to remove from the ion-exchange resins the calcium and magnesium ions previously combined/fixed to said resins
Data Source
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AI summary
A laundry washing machine (1) comprising an outer casing (2) and, inside said outer casing (2), a washing tub (3), a rotatable drum housed in axially rotatable manner inside the washing tub (3) and structured for housing the laundry to be washed, a detergent dispenser (7) which is structured for supplying detergent into the washing tub (3), a fresh- water supply circuit (9) which is structured for selectively channelling a flow of fresh water from the water mains towards the detergent dispenser (7) and/or the washing tub (3), and an internal water softening device (11) capable of reducing the hardness degree of the fresh water that the fresh-water supply circuit (9) channels towards the detergent dispenser (7) or the washing tub (3); the detergent dispenser (7) in turn comprising a detergent drawer (16) which is fitted/inserted in extractable manner into a corresponding substantially basin-shaped, drawer housing (17) which is located/recessed inside the outer casing (2), and is movable in a substantially horizontally-oriented, displacement direction (d) between a retracted position in which the detergent drawer (16) is almost completely recessed into the outer casing (2), and an extracted position in which detergent drawer (16) partly juts out from the outer casing (2); the detergent drawer (16) being furthermore provided with one or more detergent compartments (19) each structured for being manually fillable with a given amount of detergent, softener or other washing agent, and with a regeneration-agent compartment (20) which is structured for being manually fillable with a given amount of consumable salt or other regeneration agent; the regeneration- agent compartment (20) being arranged on the detergent drawer (16) beside the detergent compartment/s (19) transversally to the displacement direction (d) of the detergent drawer (16) inside the drawer housing (17), so that both the detergent compartment/s (19) and the regeneration-agent compartment (20) are simultaneously fully accessible to the user when the detergent drawer (16) is arranged in the extracted position.