Retrofittable Control Unit for Water Softening
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Solution Overview
Problem
Existing water softening systems with automatic blending are costly and complex, requiring full replacement of existing systems, and struggle to maintain consistent blended water hardness due to fluctuating raw water hardness.
Innovation Solution
A standalone control unit that connects to existing softening devices, using sensors and flow meters to automatically adjust the blending ratio of raw and softened water flows, allowing for partial softening and reducing costs by not requiring data from the softening device or external sensors, enabling 'plug and play' functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If existing water softening systems are replaced with fully automatic blending systems, then automation and consistency of blended water hardness are improved, but system complexity and cost increase
Solution Approach 1:
The system is divided into two independent parts: an existing softening device and a new control unit. The control unit handles all automatic blending functions (sensing, calculation, valve control) while the softening device continues to operate as before. This segmentation allows automation to be added without replacing the entire system, reducing complexity.
Solution Approach 2:
The control unit is designed as a universal device that can be retrofitted to any existing water softening system. It provides multiple functions: hardness sensing, flow measurement, automatic blending control, and optional regeneration triggering. This multi-functionality consolidates what would otherwise require multiple separate components.
2Reliability
If fully automatic blending systems are installed, then consistency of blended water hardness is improved, but installation cost and effort increase
Solution Approach 1:
The automatic blending functionality is extracted from proprietary integrated systems and placed into a standalone control unit. This extraction allows the system to use inexpensive, readily available components (standard sensors, flow meters, valves) rather than requiring expensive custom-integrated systems, thereby reducing cost while maintaining reliability.
Solution Approach 2:
The control unit is designed as a self-contained system that requires no data or control signals from the softening device. It independently senses water hardness, measures flow rates, calculates the required blending ratio, and controls the mixing valve. This self-service capability simplifies installation and reduces the need for external sensors or complex integration.
3Device complexity
If manual adjustment of blending ratio is used, then system simplicity is maintained, but ability to respond to fluctuating raw water hardness deteriorates
Solution Approach 1:
The control unit continuously monitors raw water hardness using a hardness sensor and adjusts the blending ratio in real-time based on the measured values. This feedback loop enables the system to automatically adapt to fluctuations in raw water hardness, maintaining consistent blended water quality without manual intervention while keeping the overall system simple through modular design.
Solution Approach 2:
The blending ratio is made dynamically adjustable through an electronically controlled valve that can change its opening position continuously based on sensor input. This replaces static manual adjustment with dynamic automatic control, allowing the system to adapt to changing conditions while maintaining simplicity through the use of a single controllable component.
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 control unit provides constant blended water quality, reduces installation effort and costs, and can work with any type of softening device, automatically adjusting to maintain desired water hardness and extend the life of the softening device by optimizing regeneration.
Implementation Method 1
a sensor for determining the water hardness of the raw water WHraw or the blended water WHblended
Implementation Method 2
The hardness components contained in the water (calcium and magnesium ions) are exchanged for sodium ions in an ion exchange resin
Data Source
Figure 1
Figure 2
AI summary
A control unit (1, 1a) for a softening apparatus (2), comprising a primary inlet (4) for untreated water, a primary outlet (7) for mixed water, a sensor for determining the water hardness of the untreated water WHroh or of the mixed water WHverschnitt, a secondary outlet (5), a secondary inlet (6), a bypass line (9), an automatically adjustable mixing device for mixing a mixed water flow Vverschnitt (t) from a first partial flow V(t)teil1weich of the secondary inflow (6) and a second partial flow V(t)teil2roh of the bypass line (9), and an electronic control device (11, 11a), the control device (11, 11a) being designed to correct the adjusting position of the mixing device on the basis of the determined water hardness such that the water hardness in the mixed water flow Vverschnitt(t) is set to a predefined target value, characterized in that the control unit (1, 1a) is designed as an external control unit (1, 1a) for the softening apparatus (2), wherein the control unit (1, 1a) comprises a control unit housing (3), on the outside of which the primary inflow (4), the primary outflow (7), the secondary outflow (5) and the secondary inflow (6) are configured, and wherein the control unit housing (3) comprises the sensor, the bypass line (9), the mixing device, and the electronic control device (11, 11a). The control unit according to the invention enables partial softening of water on the basis of fully automatic mixing while using existing softening apparatuses.