Constant Pressure Water Supply

Constant pressure water supply technology with frequency converter as the core is widely used in the water supply industry for its advantages of safe use, energy saving and environmental protection, and high quality of water supply. Frequency Inverter produced by TETRANCA, is widely used in constant pressure water supply system. Frequency converter can carry out stepless speed regulation of water pump motor, small starting current, small impact on the power grid. Frequency converter internal system PID, according to the change of water consumption pressure can automatically adjust the frequency of frequency converter operation, so as to keep the water pressure constant to meet the water requirements.

Main components: the water supply part of the water supply system mainly consists of pumps, motors, pipes and valves, remote pressure gauge and so on. Usually, the water pump is driven by asynchronous motor to rotate to supply water, and the motor and pump are made into a single unit, and the rotational speed of the asynchronous motor is adjusted by the frequency converter, so as to change the water flow rate of the pump to realize the constant pressure water supply.

Working principle: the following figure, in the process of system operation, if the actual water supply pressure is lower than the set pressure, the control system will get the positive pressure difference, this difference is calculated and converted (PID calculation), calculated the increase in the frequency converter output frequency, this increment and the frequency converter current operating frequency value is added, the resulting value that is the frequency converter should be output frequency. The frequency makes the pump unit speed increase, so that the actual water supply pressure increases. Conversely, the frequency converter running frequency decreases. This process will be repeated during operation until the actual water supply pressure and the set pressure are equal.

1. The frequency converter can infinitely adjust the speed, can precisely adjust the frequency of the pump motor, so as to achieve precise adjustment of the pump outlet pressure, greatly reducing the effectiveness lost due to pressure fluctuations;
2. With automatic dormancy function, the dormancy time can be adjusted, the energy saving effect is obvious;
3. Since most of the time the customer demand flow is less than the rated flow, the pump works below the working frequency, the pump speed is reduced, reducing the wear and tear of the bearings and the heat, prolonging the mechanical service life of the pump and motor; the motor does not need to run on the industrial frequency, saving 25% to 60% of electric energy, the system has a fast recovery of investment, and long-term benefit, the social benefits it produces are also very great;
4. Because of the realization of constant pressure automatic control, it does not require frequent operation by the operator, which reduces the labor intensity of the personnel and saves manpower;
5. The water pump motor adopts a soft-starting mode, accelerating according to the set acceleration time, avoiding the need to use the pump for the first time and avoiding the need to use the pump for the second time. It accelerates according to the set acceleration time, avoiding the current impact when the motor starts and the impact of fluctuation on the grid voltage, and also avoiding the sudden acceleration of the motor to cause the pumping system to wheeze.