Single Controller for Dual Water Softener Tanks
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Solution Overview
Problem
Existing water softener systems require multiple controllers for multiple treatment tanks, increasing manufacturing and consumer costs, and do not allow for continuous operation without supplementary controllers.
Innovation Solution
A single controller system with a sensor assembly that includes sensor probes and flow meters to monitor ion exchange resin capacity in each tank, enabling alternating regeneration cycles and remote monitoring, allowing one controller to manage two treatment tanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple controllers are used for multiple treatment tanks, then each tank can be independently controlled, but manufacturing cost and consumer cost increase
Solution Approach 1:
A single controller is designed to perform the function of multiple controllers by sequentially controlling multiple treatment tanks. The controller includes a microprocessor that can independently manage each tank's operations (service mode, regeneration mode) through programmed logic, replacing the need for separate dedicated controllers for each tank.
Solution Approach 2:
Multiple control functions that were previously distributed across separate controllers are merged into a single integrated controller. The controller combines the control logic for multiple tanks, sensors, and valve assemblies into one unit, reducing system complexity while maintaining independent control capability through software management.
2Device complexity
If a single controller manages multiple tanks, then cost is reduced, but continuous operation capability must be maintained
Solution Approach 1:
The system implements alternating periodic operation where treatment tanks are cycled between service mode and regeneration mode. While one tank is providing service, another undergoes regeneration, and this pattern alternates periodically to ensure continuous service availability. The controller manages these periodic transitions automatically.
Solution Approach 2:
The system performs preliminary regeneration of treatment tanks before they are needed for service. The controller monitors resin capacity and initiates regeneration cycles in advance, so that a treated tank is ready to take over service duty before the current service tank requires regeneration, ensuring uninterrupted operation.
3Loss of time
If sensor probes monitor resin capacity, then regeneration timing is optimized, but system complexity increases
Solution Approach 1:
The sensor assembly automatically monitors resin capacity and provides feedback to the controller without requiring manual intervention. The capacitive sensors continuously measure resin bed conditions and the system self-regulates regeneration timing based on actual resin capacity, eliminating the need for manual monitoring and optimization.
Solution Approach 2:
Capacitive sensors provide continuous feedback signals to the microprocessor controller about resin bed capacity and condition. This feedback enables the controller to automatically determine when regeneration is needed, optimizing the regeneration timing based on actual operational conditions rather than fixed schedules.
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
Enables reduced manufacturing and consumer costs by allowing a single controller to manage two treatment tanks, ensuring continuous water softening and providing remote monitoring and error reporting for efficient maintenance.
Implementation Method 1
A sensor probe, located in the first treatment tank, includes two pairs of vertically mounted electrodes for detecting the impedance difference of the ion exchange resin
Implementation Method 2
A flow meter is also provided within the first treatment tank and is in communication with the controller
Implementation Method 3
Water softening occurs by running water through the ion exchange resin, which replaces the calcium and magnesium cations in the water with sodium cations
Data Source
Figure 1
AI summary
A sensor assembly (10) for a water softening system includes a first treatment tank (14) having a first valve assembly (26), a first flow meter (62) and a sensor probe (54), a second treatment tank (16) having a second valve assembly (40) and a second flow meter (72) and a brine tank (18) independently connected to each of the first treatment tank (14) and the second treatment tank (16). A controller (60) is configured for communicating with the sensor probe (54) and the first flow meter (62) in the first treatment tank (14), and the second flow meter (72) in the second treatment tank (16).