The concept of the fan

　　Fan depend on the input mechanical energy, improve the pressure side by side to send gas machinery, it is a kind of driven fluid machinery.

　　Fan is used for compression and gas conveying machinery, commonly referred to as fan fan, fan, compressor and roots blower, the centrifugal fan, rotary fan, water ring type fan [2] , but not including positive displacement blower and compressor piston compressor. Compression and gas conveying machinery is the rotating machinery is converted to gas pressure energy and kinetic energy, and the gas conveying machinery.

　　Fan, scope of application:

　　Fan is widely used in factories, mines, tunnels, cooling tower, vehicles, ships, and the structure of the ventilation, dust and cooling; The ventilation of the boilers and industrial furnaces and wind; Air conditioning equipment and household appliances in cooling and ventilation; Grain drying and submitted; Wind tunnel and become a hovercraft inflatable and propulsion, etc.

　　Fan works and turbine compressor basic same, just due to the low gas flow rate, pressure change is not big, generally do not need to consider the change of the gas volume, namely the gas as incompressible fluid handling.

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