Pure Water Supply Pressure Control for Variable Usage Demand
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Solution Overview
Problem
Conventional ultrapure water production systems face inefficiencies in energy consumption due to the need to supply and process excess water, making it difficult to adjust water production according to usage fluctuations, especially in large-scale systems without tanks, which can degrade water quality.
Innovation Solution
A control method for pure water production systems that adjusts the supply amount using a flow adjustment mechanism and inverter-controlled water supply mechanism to maintain constant water supply pressure, independent of tank presence, by responding to usage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess water is supplied and processed through the electrodeionization device to maintain stable water quality, then water quality stability is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the water supply amount adjustable rather than fixed. The flow adjustment mechanism dynamically changes the supply amount based on actual usage patterns, allowing the system to transition from static excess supply to dynamic demand-based supply, thereby reducing energy consumption while maintaining quality stability.
Solution Approach 2:
The patent changes the parameter of water supply amount from a constant excessive value to a variable value that responds to usage changes. By adjusting the supply amount parameter according to actual demand while maintaining pressure stability, the system achieves both energy efficiency and water quality reliability.
2Loss of energy
If the processing amount of the electrodeionization device is varied to match usage fluctuations, then energy efficiency is improved, but water quality decreases
Solution Approach 1:
The patent implements feedback control where the control device monitors usage amount changes and adjusts the flow adjustment mechanism accordingly. This closed-loop feedback ensures that the supply amount matches actual demand while maintaining pressure stability, achieving both energy efficiency and water quality reliability simultaneously.
Solution Approach 2:
The system dynamically adjusts the water supply amount in response to usage fluctuations rather than operating at a fixed rate. This dynamic adaptation allows the electrodeionization device to process only the necessary amount of water, reducing energy consumption while maintaining quality through pressure-stable flow control.
3Reliability
If a tank is used to store primary pure water for stable supply, then water supply stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the water storage function from the traditional tank-based system. Instead of using a physical tank to store primary pure water, the system uses a flow adjustment mechanism and pressure control to maintain stable supply directly, eliminating the tank component and reducing system complexity while preserving supply stability.
Solution Approach 2:
The patent replaces the mechanical tank storage system with a control-based system using flow adjustment mechanisms and pressure regulation. This substitution eliminates the need for physical storage tanks while achieving water supply stability through intelligent control of flow and pressure parameters.
4Reliability
If water supply pressure is maintained constant regardless of usage changes, then water supply stability is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the water supply amount adjustable rather than fixed. The flow adjustment mechanism dynamically changes the supply amount based on actual usage patterns, allowing the system to transition from static excess supply to dynamic demand-based supply, thereby reducing energy consumption while maintaining quality stability.
Solution Approach 2:
The patent changes the parameter of water supply amount from a constant excessive value to a variable value that responds to usage changes. By adjusting the supply amount parameter according to actual demand while maintaining pressure stability, the system achieves both energy efficiency and water quality reliability.
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 allows for simple and versatile control of water supply, reducing energy consumption and maintaining water quality by adjusting supply based on usage, even in systems without tanks.
Implementation Method 1
adjusting a supply amount of pure water by the flow adjustment mechanism according to an amount of water usage
Implementation Method 2
controlling water supply output of the water supply mechanism so that a measurement value of the pressure meter becomes substantially constant
Data Source
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AI summary
When the amount of water usage at each use point decreases and the amount of water supply to sub systems 4A, 4B, 4C becomes lower than a reference value, if the amount of water supply is reduced by throttling each of control valves 60A, 60B, 60C, the water supply pressure at a pressure meter 59 increases. Therefore, a control means reduces, on the basis of the measurement value from the pressure meter 59, the output of a high pressure pump 52B through inverter control such that the measurement value at the pressure meter 59 becomes substantially constant with respect to a predetermined value. In addition, when the amount of water usage at each use point increases and the amount of water supply to the sub systems 4A, 4B, 4C becomes higher than the reference value, the amount of water supply is increased by opening each of the control valves 60A, 60B, 60C. This reduces the water supply pressure at the pressure meter 59. Therefore, the control means increases, on the basis of the measurement value at the pressure meter 59, the output by the high pressure pump 52B through inverter control such that the measurement value at the pressure meter 59 becomes substantially constant with respect to a predetermined value. Such a control method for a pure water production system allows for control of the amount of water supply according to the amount of water usage.