A common medium pressure fan is a centrifugal fan, the impeller is covered with a mechanical casing, and the center of the impeller is the air inlet. When the medium pressure fan is working, the power equipment runs to drive the impeller to rotate, sucking air in from the air inlet. During the rotation of the blades of the centrifugal fan, a dynamic action is exerted on the gas to increase the pressure and speed of the gas, and the gas is discharged from the exhaust port along the blade channel under the action of the centrifugal force.
During the working process of the medium pressure fan, although the rotation of the impeller increases the pressure and speed of the gas, the various changes of the gas are small. Therefore, in the design and use of the centrifugal fan, the gas is usually regarded as incompressible. Fluid to handle. The gas treatment process of the medium pressure fan is completed in the same radial plane, so the medium pressure fan is also called a radial centrifugal fan.
Among the performance parameters of medium pressure fans, the more important ones are gas flow, pressure, conveyed power, efficiency, and impeller speed, etc., which must be paid attention to in the selection process. The gas flow parameter of the medium pressure fan represents the volume of gas that the fan can handle per unit time, and the pressure of the medium pressure fan refers to the internal gas pressure value during the operation of the medium pressure fan.
The efficiency of the medium pressure fan refers to the ratio between the shaft power of the medium pressure fan and the effective power of the actual gas processed. The total pressure efficiency of the centrifugal fan is about 90%, and in the future development of the centrifugal fan, the efficiency value will be one of the further goals pursued by the researchers.
Medium-pressure fans are widely used for exhausting dust and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air for boilers and industrial furnaces; cooling and cooling in air conditioning equipment and household appliances Ventilation; drying and selective delivery of grains; air source of wind tunnel and inflation and propulsion of hovercraft, etc.
