In the water supply system, constant pressure water supply refers to the control method of maintaining the outlet pressure at the set value when the water consumption in the water supply network changes by detecting the pressure of the pipeline network. When using a water pump, the rated flow rate of the selected equipment usually exceeds the actual required flow rate, and the required flow rate will change during the actual water use process. For example, in building water supply, the water consumption during the day and night varies greatly, and the use of valves to adjust the flow rate is more common. Although the method is simple, it actually achieves the purpose of regulation by artificially increasing resistance. This throttling regulation method wastes a lot of electrical energy and increases the cost of equipment use and maintenance.
Working principle analysis
The constant pressure water supply system detects the pressure of the pipeline network through pressure sensors and feeds back to the frequency converter in the form of voltage or current (0-10v or 4-20ma). Its built-in PID adjusts the motor output speed accordingly by comparing the user's set pressure with the feedback pressure, thereby achieving the effect of constant pressure. In the case of minimal water consumption at night and water pressure not affecting user use, the entire system enters a sleep state. After the water pressure drops to a certain value and remains at that pressure for a certain period of time, the system can automatically wake up.