VFD pumps are also known as variable-frequency pump controllers. In recent years, the frequency conversion pump is widely used in constant pressure water supply system, fire fighting equipment, high-rise building water supply system, water treatment equipment, environmental engineering and other fields.

1.Disadvantages of traditional water supply systems

The traditional water supply system is composed of water tower, high water tank or pressure tank.

• Compared with the modern frequency conversion pump water supply system, the traditional method has higher equipment investment cost.
• In the use of these traditional water supply system, it has a large pump shaft power and energy loss.
• It is likely to cause secondary pollution of water.

2.Benefits of using the Garford pump inverter drive

• The use of inverter-driven pumps can save 20% -40% of the power, energy-saving environmental protection
• System covers a small area, less investment, high efficiency
• The utility model has the advantages of high configuration flexibility, high degree of automation, rich functions and stable performance
• Reasonable operation, soft start and soft stop, can eliminate the water hammer effect. Therefore, the average motor shaft torque and wear will be reduced a lot. The utility model not only reduces the maintenance cost, but also greatly improves the service life of the pump and the entire water supply system.
• The constant pressure water supply system obtains water directly from the water source, reduces the secondary pollution, and effectively prevents the transmission of infectious diseases.
• Communication Control: frequency conversion pump system can help you achieve unattended control, saving manpower.

Pump flow and pump (three-phase asynchronous pump) speed is proportional, pump head and pump speed is proportional to the square, pump shaft power is equal to the flow and head product, so pump shaft power and pump speed is proportional to the third power. According to these formulas, we can know that changing the pump speed is to change the pump power.

The following basic formulas are:

In these formulas, Q stands for flow, N for pump speed, H for head, and P for shaft power.

For example, if we change the power supply frequency from 50 Hz to 45 Hz, then P45/P50 = (45/50)3 = 0.729, P45 = 0.729 P50. If we change the power supply frequency from 50 Hz to 40 Hz, then P40/P50 = (40.50)3 = 0.512, P40 = 0.512 P50

The pump water supply system is designed according to the actual demand, but the actual use of water supply system does not necessarily reach the maximum water, so the valve regulation system increases the resistance to the throttle valve. In this case, will cause a great loss of electricity. The use of pump frequency converter can make the system work smoothly and steadily, by changing the pump speed to adjust the water supply, which is the constant pressure water supply system with high energy efficiency and low cost reasons.

4.Common Application of Gafford inverter pump

• Domestic high-rise building water supply system, urban and rural residents water supply, enterprises and institutions
• It is also commonly used in various industrial constant control needs, such as cooling water, hot water circulation, boiler water supply
• You can also find Gafford variable-frequency pumps widely used in waterworks' supercharging systems
• It is also used for irrigation, sewage treatment and artificial fountains
• Other fluid constant pressure control system