What is the working principle and performance characteristics of the centrifugal fan?

- Nov 11, 2019-

The working principle of the centrifugal fan is basically the same as that of the turbo compressor. However, because the gas flow rate is low, the pressure does not change much. Generally, it is not necessary to consider the change of the specific volume of the gas, that is, the gas is treated as an incompressible fluid.

Centrifugal fans are available in both right-handed and left-handed versions. Looking from the side of the motor, the impeller rotates clockwise, called the right rotary fan, rotating counterclockwise, called left-handed.

Centrifugal fan application:

     Centrifugal fans are widely used in industrial machinery such as plastic machinery, UV equipment, packaging machines, shrinking machines, hot air ovens, filming machines, laminating machines, large printing machines and other machinery for drying, heat transfer, heat dissipation, etc.; It can be used for air conditioning, heating and cooling cycle, exhaust air, ventilation, etc. in cold and warm equipment, frozen food machinery, general factory, sterile room, etc. It can also be used in kitchen fume extraction equipment, room ventilation equipment; Wide variety.

Centrifugal fan performance characteristics:

The centrifugal fan is essentially a variable flow constant pressure device. When the speed is constant, the pressure-flow theoretical curve of the centrifugal fan should be a straight line. The actual characteristic curve is curved due to internal losses. The pressure generated in the centrifugal fan is greatly affected by changes in intake air temperature or density. For a given amount of intake air, the highest intake air temperature (the lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power versus flow characteristic curve. When the blower is operating at a constant speed, the required power increases with decreasing intake air temperature for a given flow rate.