Washing Machine Water Softening Layout for Flexible Detergent Flushing
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Solution Overview
Problem
Current front-loading laundry washing machines with integrated water softening devices face issues such as complex detergent dispenser structures, limited salt reservoir capacity, frequent ion-exchange resin regeneration, and limited operation flexibility, leading to increased production costs and user inconvenience.
Innovation Solution
A laundry washing machine design featuring a water softening device with a separate salt reservoir and ion-exchange resin container, utilizing an electrically-controlled hydraulic distributor and brine-circulating pump to manage water softening and regeneration, allowing for flexible washing cycles and extended resin life, and an additional fresh-water supply circuit to bypass softening for detergent compartments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the salt reservoir is integrated on the back of the detergent drawer, then the water softening function is achieved, but the detergent dispenser structure becomes very complicated and production cost increases significantly
Solution Approach 1:
The patent divides the water softening system into separate components: the salt reservoir is detached from the detergent drawer and positioned independently in the upper part of the cabinet. The detergent dispenser structure is simplified to only handle detergent, while the water softening function is provided by a separate module with its own salt reservoir and regeneration system.
Solution Approach 2:
The salt reservoir is extracted from the detergent drawer assembly and repositioned as an independent component in the upper cabinet space. This separation removes the complexity of integrating salt storage and dispensing mechanisms within the detergent drawer, simplifying both structures while maintaining the water softening function.
2Volume of stationary object
If the salt reservoir capacity is limited, then the device size is reduced, but the user must refill salt frequently every 3-4 washing cycles
Solution Approach 1:
The salt reservoir is positioned in the upper vertical space of the cabinet rather than within the horizontal detergent drawer. This utilizes previously unused vertical volume, allowing for a much larger salt storage capacity without increasing the footprint or interfering with detergent drawer operations.
3Reliability
If the ion-exchange resins are regenerated frequently, then the water softening effectiveness is maintained, but the operation flexibility is reduced and user convenience decreases
Solution Approach 1:
The system performs preliminary regeneration of ion-exchange resins during idle periods or between washing cycles using stored brine. This allows the main washing cycles to proceed without interruption for resin regeneration, maintaining water softening effectiveness while preserving washing cycle flexibility and user convenience.
Solution Approach 2:
The regeneration process is implemented as a periodic background operation rather than an interruptive process. The control system schedules resin regeneration during periods when washing is not required, using pre-prepared brine solutions. This maintains effective water softening while allowing users to operate washing cycles without waiting for regeneration.
4Reliability
If the brine accumulates on the bottom of the drawer housing, then the regeneration process is incomplete, but the brine can reach the revolving drum and cause quick rusting
Solution Approach 1:
The salt reservoir is extracted from the detergent drawer housing and repositioned in the upper cabinet. This physical separation eliminates the risk of brine accumulation in the drawer housing and subsequent contact with the revolving drum, preventing rusting while ensuring complete regeneration through proper brine circulation and drainage pathways.
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 simplifies the detergent dispenser structure, extends salt reservoir capacity, reduces resin regeneration frequency, and enhances operational flexibility, improving user convenience and reducing production costs while maintaining effective water softening.
Implementation Method 1
This water softening device uses ion-exchange resins to restrain calcium and magnesium ions (Ca++ an Mg++) dissolved in the fresh water channeled to the washing tub
Implementation Method 2
uses brine (i.e. salt water) to periodically regenerate these ion-exchange resins. 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
AI summary
Laundry washing machine (1) includes an outer casing (2) and, inside said casing (2), a washing tub (3). A rotatable drum arranged in an axially rotating manner inside the washing tub (3) and is structured for receiving the laundry to be washed. A detergent dispensing assembly (9) is structured for supplying detergent into the washing tub (3). A first fresh-water supply circuit (10) is structured for selectively channeling a flow of fresh water from the water mains towards the detergent dispensing assembly (9) and/or the washing tub (3). A water softening device (11) which is interposed between the first fresh-water supply circuit (10) and the detergent dispensing assembly (9) or the washing tub (3), and is structured for reducing the hardness degree of the fresh water supplied to the washing tub (3). The detergent dispensing assembly (9), includes a detergent container (16) which is provided with a number of detergent compartments (16a) each fillable with a respective detergent product, and a detergent flush circuit (18) which receives the fresh water from the water softening device (11) and is structured for selectively spilling/pouring the fresh water arriving from the water softening device (11) into any one of said detergent compartments (16a). The laundry washing machine (1) furthermore includes a second fresh-water supply circuit (44) which connects the water mains directly to the detergent flush circuit (18) of the detergent dispensing assembly (9), bypassing the water softening device (11), and which is structured so as to control/regulate the flow of fresh water from the water mains towards said detergent flush circuit (18).