EDR Film Stack Pressure Balancing via Variable Speed Pump
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Solution Overview
Problem
Conventional water purifiers face frequent film stack damage due to pressure differences on both sides of the electrodialysis reversal (EDR) film stack, leading to reduced service life and purification efficiency.
Innovation Solution
A pressure balancing system comprising pressure sensors, a variable speed pump, and a control system that adjusts flow rates and pressures to equalize the pressure on both sides of the EDR film stack, using a one-way valve and rinsing solenoid valve to manage clean and waste water outlets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional water purifiers operate without pressure balancing, then the structure is simple and operation is easy, but the film stack suffers from pressure difference damage leading to reduced service life
Solution Approach 1:
The system employs pressure sensors on both sides of the EDR film stack that continuously monitor pressure differences and provide feedback signals to the control system. The control system automatically adjusts the variable speed pump and rinsing solenoid valve to maintain pressure balance, preventing film stack damage without requiring complex manual intervention or over-engineered mechanical structures
Solution Approach 2:
The invention changes the operational parameters of the water purifier by introducing variable speed pump control and solenoid valve regulation. By dynamically adjusting flow rates and pressures through electrical control rather than fixed mechanical design, the system achieves pressure balancing that extends film stack service life while maintaining reasonable system complexity
2Reliability
If pressure balancing system is implemented, then service life of EDR film stack is extended, but the device complexity increases due to additional sensors and control components
Solution Approach 1:
The pressure balancing system operates autonomously by using the pressure sensors and control system to automatically monitor and adjust pressures on both sides of the film stack. The variable speed pump and rinsing solenoid valve are self-regulated by pressure feedback, eliminating the need for external intervention and reducing the need for additional complex control mechanisms
Solution Approach 2:
The invention replaces complex mechanical pressure balancing mechanisms with an electrical control system. Instead of using mechanical valves, springs, or complex hydraulic systems to balance pressure, the patent uses electronic pressure sensors and a control system that actuates a variable speed pump and solenoid valve, simplifying the overall mechanical structure while improving reliability
3Manufacturing precision
If variable speed pump and solenoid valve are used for pressure control, then pressure balancing precision is improved, but energy consumption increases
Solution Approach 1:
The system uses a variable speed pump instead of a fixed-speed pump, allowing the rotational speed to be dynamically adjusted based on real-time pressure feedback. The rinsing solenoid valve is also controlled dynamically to regulate waste water flow. This dynamic control enables precise pressure balancing while consuming only the necessary energy required at each moment, avoiding energy waste from continuous high-speed operation
Solution Approach 2:
The pressure balancing system operates in periodic cycles: the pressure sensors continuously monitor pressure differences, and when imbalance is detected, the control system activates the variable speed pump and/or rinsing solenoid valve to correct the pressure. Once pressure balance is achieved, the system reduces or stops pump/valve operation. This periodic action rather than continuous operation reduces overall energy consumption while maintaining precise pressure control
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 system effectively balances pressures across the EDR film stack, extending its service life and enhancing water purification efficiency by ensuring equal discharge pressures for clean and waste water.
Implementation Method 1
The four pressure sensors are set to detect pressures of the water flowing through the two inlet ports and the two outlet ports of the EDR film stack
Implementation Method 2
the control system module to adjust a rotational speed of the variable speed pump (to increase the rotational speed)
Implementation Method 3
The second source water inlet, the one-way valve, the third pressure sensor, and the second inlet port of the EDR film stack are connected in sequence
Data Source
AI summary
A pressure balancing system for two sides of an electrodialysis reversal (EDR) film stack includes two source water inlets, an EDR film stack, four pressure sensors, a variable speed pump, a one-way valve, a clean water outlet, a waste water outlet, and a control system module. With the four pressure sensors detecting water pressures at four ports on two sides of the EDR film stack and with the variable speed pump and the control system module adjusting water pressure at the waste water outlet, water pressure at the clean water outlet is equivalent to the water pressure at the waste water outlet. Accordingly, the water pressures on the two sides of the EDR film stack can be balanced, and service life and water purification efficiency of the EDR film stack can be improved.