Washer Water Softener Brine Recirculation to Prevent Salt Stratification
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Solution Overview
Problem
The prolonged stay of brine in the water softening device of laundry washing machines leads to stratification, resulting in poor regeneration of ion-exchange resins and salt deposits that impair the operation of the electric pump assembly.
Innovation Solution
An operating method that involves channeling fresh water into a regeneration-agent container to form brine, accumulating it in a storage tank, and circulating it in a closed loop through the water softening device and storage tank, bypassing the regeneration-agent container, to ensure effective regeneration of the ion-exchange resins and prevent salt deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brine is allowed to remain stationary in the water softening device for prolonged periods to regenerate ion-exchange resins, then regeneration effectiveness is improved, but salt stratification occurs causing poor regeneration at the top and salt deposits that impair pump operation
Solution Approach 1:
The patent implements periodic circulation of brine through the water softening device during regeneration. The control unit activates the pump to circulate brine at regular intervals (e.g., every 5 minutes) rather than allowing it to remain stationary, preventing salt stratification while maintaining regeneration effectiveness. This periodic action resolves the contradiction by dynamically refreshing the brine distribution throughout the resin bed.
Solution Approach 2:
The patent incorporates sensors to monitor salt concentration and distribution within the water softening device. Based on feedback from these sensors, the control unit adjusts the circulation timing and duration to prevent stratification. When salt concentration gradients are detected, the system increases circulation frequency, thereby preventing harmful deposits while maintaining effective regeneration.
2Reliability
If brine circulation time is extended to ensure complete regeneration of ion-exchange resins, then regeneration quality is improved, but water consumption and energy usage increase
Solution Approach 1:
The control unit uses feedback from concentration sensors to determine when regeneration is sufficiently complete. Instead of using fixed extended circulation times, the system monitors salt concentration distribution and terminates circulation when regeneration quality thresholds are met, thereby reducing unnecessary water and energy consumption while maintaining high regeneration quality.
Solution Approach 2:
The patent dynamically adjusts circulation flow rate and duration based on real-time monitoring of regeneration progress. By changing operational parameters (flow rate, circulation time) according to actual resin regeneration status rather than using fixed conservative values, the system achieves complete regeneration with optimized resource consumption.
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 method enhances the regeneration efficiency of ion-exchange resins by ensuring even brine distribution and prevents salt deposits, thereby maintaining the operation of the electric pump assembly and improving washing machine performance.
Implementation Method 1
a water softening device which is crossed by the fresh water directed towards the washing tub and/or the detergent dispenser, and which is filled with a water softening agent capable of reducing the hardness degree of the fresh 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 (Ca++ and Mg++) previously combined/fixed to said resins
Data Source
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Figure 3
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AI summary
Operating method of a laundry washing machine (1) comprising: an internal water softening device (13) which is crossed by the fresh water directed towards the washing tub (3) and/or the detergent dispenser (10), and which is filled with a water softening agent capable of reducing the hardness degree of the fresh water flowing through the same water softening device (13); a regeneration-agent container (21) containing a given amount of consumable salt or other regeneration agent; a first water-supply line (19) for selectively channelling a flow of fresh water into said regeneration-agent container (21) to form a brine capable of regenerating the water softening properties of said water softening agent; and a storage tank (35) which is fluidically connected to said regeneration-agent container (21) for receiving and accumulating the brine formed into said regeneration-agent container (21), and to said water softening device (13) for delivering said brine to the water softening device (13); the operating method of the laundry washing machine (1) comprising the steps of: channelling, via said first water-supply line (19), a given amount of fresh water into the regeneration-agent container (21) so as to form a given amount of brine that flows and accumulates into said storage tank (35); fluidically connecting the water softening device (13) in closed loop to said storage tank (35) bypassing said regeneration-agent container (21); circulating, for a given recirculation time period, said given amount of brine in closed loop through the water softening device (13) and the storage tank (35) while bypassing said regeneration-agent container (21); and lastly removing, after a given regeneration time period encompassing said recirculation time period, the brine from said water softening device (13).