1、 Industry background
The constant pressure water supply system is an important component of modern urban water supply. With the acceleration of urbanization and continuous improvement of infrastructure construction in China, the market size of the water supply system continues to expand. According to statistics, the average annual growth rate of the secondary water supply equipment market in China has remained above 15%, with frequency conversion constant pressure water supply equipment accounting for over 60%. The application of frequency conversion technology has brought revolutionary changes to traditional water supply systems.
2、 Principle of Constant Pressure Water Supply System
The constant pressure water supply system mainly consists of water pumps, motors, pressure sensors, control systems, etc. The traditional water supply system adopts the power frequency operation mode, which controls the water pressure through valve regulation. This method has the following problems:
A、 The water pump always runs at full speed, causing a lot of energy waste
B、 The pressure fluctuation of the pipeline network is large, which affects the quality of water supply
C、 The water pump starts and stops frequently, and the equipment is severely worn out
D、 The water hammer effect is significant and can easily damage the pipeline network
3、 Transformation plan for frequency converter
Selection of frequency converter:
Adopting M-driver 900 series dedicated water supply frequency converter (power matched according to the power of the water pump motor)
System configuration:
High precision pressure sensor (4-20mA output)
PLC controlling sYstem
Human-computer interaction interface
Backup power frequency operation circuit
Technical requirements:
A、 Pressure control accuracy ± 0.01MPa
B、 Equipped with multi pump linkage control function
C、 Ensure good heat dissipation of the motor during low-frequency operation
D、 Equipped with fault self diagnosis and protection functions
4、 Transformation effect
Significant energy-saving effect:
The average power saving rate reaches 30% -50%
Annual savings on electricity bills can reach tens of thousands of yuan
Improvement of water supply quality:
Control pressure fluctuations within ± 0.01MPa
Thoroughly solve the problem of insufficient water pressure in high-rise buildings
Equipment protection:
Soft start reduces mechanical impact
Extend the service life of the water pump by 2-3 times
Effectively eliminate water hammer effect
Intelligent management:
Realize remote monitoring
Automatically record operational data
Fault warning function
5、 Summary
The application of frequency conversion technology in constant pressure water supply systems not only solves various drawbacks of traditional water supply methods, but also demonstrates significant advantages in energy conservation, stable water supply, equipment protection, and other aspects. With the continuous advancement of technology, the variable frequency constant pressure water supply system will play a more important role in urban construction and contribute to the creation of an energy-saving society.
