Laundry washing machine
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Solution Overview
Problem
Current front-loading laundry washing machines face issues with water hardness affecting detergent efficiency, leading to increased detergent usage and corrosion of metal components due to brine leakage from internal water softening devices, and the salt reservoir capacity is insufficient for typical use.
Innovation Solution
A laundry washing machine with an external regeneration-agent reservoir and a water softening device that reduces water hardness, featuring a separate container for ion-exchange resins and a regeneration-agent reservoir accessible for user refilling, allowing for efficient regeneration and extended salt capacity without compromising the detergent dispensing assembly's complexity or production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal water softening device with ion-exchange resins is integrated into the detergent drawer, then water hardness is reduced during each washing cycle, but the detergent drawer structure becomes very complicated and production costs increase significantly
Solution Approach 1:
The water softening system is divided into two independent parts: a permanent resin container integrated into the washing machine and a removable salt container that users can refill. This segmentation separates the complex resin handling from user operations, simplifying the detergent drawer structure while maintaining water softening functionality.
Solution Approach 2:
The salt reservoir is extracted from the detergent drawer assembly and positioned separately within the washing machine body. This extraction eliminates the need for complex integrated structures in the detergent drawer, reducing manufacturing costs while preserving the water softening function through the separate resin container system.
2Reliability
If brine is used to regenerate ion-exchange resins in an internal water softening device, then resin regeneration is achieved, but brine leakage accumulates on the drawer housing bottom and reaches the rotatable drum causing rapid rusting
Solution Approach 1:
A dedicated brine containment and drainage system acts as an intermediary between the regeneration process and the washing machine interior. This intermediary system captures brine during regeneration and channels it through proper drainage paths, preventing direct contact with the rotatable drum and eliminating corrosion risks while maintaining regeneration functionality.
3Reliability
If a salt reservoir is integrated on the back of the detergent drawer, then water softening is provided, but the reservoir capacity is too limited requiring refilling every 3-4 washing cycles
Solution Approach 1:
The salt storage capacity is expanded by utilizing the vertical space within the washing machine body rather than being constrained to the horizontal detergent drawer area. This dimensional change allows for a larger salt reservoir that can sustain multiple washing cycles without refilling, reducing user maintenance frequency.
4Ease of operation
If the salt reservoir capacity is increased to reduce refilling frequency, then user convenience is improved, but the detergent drawer structure becomes more complicated and production costs increase
Solution Approach 1:
The salt reservoir is extracted from the detergent drawer assembly and repositioned within the washing machine body. This extraction allows for increased reservoir capacity without adding complexity to the detergent drawer structure, as the enlarged salt storage is spatially separated from the dispensing mechanism, maintaining manufacturing simplicity while improving user convenience.
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 effectively reduces water hardness, minimizes detergent usage, prevents corrosion, and extends the interval between salt refills, enhancing cleaning efficiency and user convenience while maintaining cost-effectiveness.
Implementation Method 1
This internal water softening device uses ion-exchange resins to restrain calcium and magnesium ions (Ca++ an Mg++) dissolved in the fresh water channelled to the washing tub
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
AI summary
A laundry washing machine (1) has an outer casing (2) and, inside the outer casing (2), a washing tub (3), a detergent dispensing assembly (9) structured for supplying detergent into the washing tub (3), and a fresh-water supply circuit (10) 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 (12) is arranged/located along the fresh-water supply circuit (10) and is structured for reducing the hardness degree of the fresh water channeled to the detergent dispensing assembly (9) and/or the washing tub (3). The water softening device (12) being internally provided with a given amount of water softening agent able to reduce the hardens degree of the fresh water flowing through the same water softening device (12), and with a given amount of consumable regeneration agent, able to regenerate the water softening function of the water softening agent. The laundry washing machine (1) further has an appliance control panel (11) located on a front wall (2a) of the casing (2), close to a worktop (2b) of the casing (2), and structured for allowing the user to manually select the desired washing-cycle. The water softening device (12) being provided with a loading inlet or mouth (33a, 52) structured for allowing the user to load a regeneration agent inside the same internal water softening device (12) and arranged/located inside the casing (2) so that its loading inlet or mouth (33a, 52) is exposed or exposable to the outside on said worktop (2b) of the casing (2), substantially behind the appliance control panel (11).