Variable frequency and constant pressure water supply refers to the water supply method in which the outlet pressure remains constant when the water consumption in the water supply network changes. The outlet pressure value of the water supply pipe network is determined according to the needs of users. The traditional constant pressure water supply method is realized by using water towers, high water level tanks, air pressure tanks and other facilities.
In recent years, with the increasing maturity of variable frequency speed regulation technology, its remarkable energy-saving effect and reliable and stable control mode have been widely used in water supply systems. The variable frequency constant pressure water supply system implements stepless speed regulation for the water pump motor. According to the water consumption and water pressure changes, it can automatically change the water pump speed through microcomputer detection and calculation to keep the water pressure constant to meet the water requirements. It is the most advanced and reasonable energy-saving water supply system. . Compared with traditional water supply methods such as water towers, high-level water tanks, and pressure tanks, it has advantages in terms of investment, operating economy, system stability, reliability, and automation:
(1) High efficiency and energy saving. Compared with traditional water supply methods, variable frequency and constant pressure water supply can save energy by 20%-40%.
(2) Small footprint, low investment and high efficiency.
(3) Flexible configuration, high degree of automation, complete functions, flexible and reliable.
(4) The operation is reasonable, because the average speed of the day decreases, the average torque and wear on the shaft are reduced, and the life of the water pump will be greatly improved.
(5) Because it can realize soft stop and soft start of the water pump, and can eliminate the water hammer effect (water hammer effect: when starting and stopping directly, the kinetic energy of the liquid increases sharply, resulting in a great impact on the pipe network).
(6) Easy to operate, saving time and effort.
The variable frequency constant pressure water supply system takes the water pressure of the pipe network (or the user's water flow) as the set parameter, and automatically adjusts the speed of the pump motor by controlling the output frequency of the Variable Frequency Drive(VFD) to realize the closed-loop adjustment of the water pressure of the pipe network (PID). Make the water supply system automatically stabilize at the set pressure value:
When the water consumption increases, the frequency increases, the pump speed increases, and the water supply increases accordingly;
When the water consumption decreases, the frequency decreases, the speed of the water pump slows down, and the water supply decreases accordingly;
In this way, the user's requirements for water pressure and water volume are guaranteed for water supply efficiency, and at the same time, the purpose of improving water supply quality and water supply efficiency is achieved, "how much water is used, how much water is supplied";
The equipment does not need to build high-level water tanks, water towers, and the water quality has no secondary pollution. It is an ideal water supply equipment for modern buildings.
Application range
Relevant industries:
design institutes, fire stations, property companies, professional construction units for fire protection and other residential quarters, commercial office buildings, hotels, restaurants, shopping malls, large supermarkets, subways, stadiums, etc.
