Operating Principle:
Common medium-pressure fans are centrifugal fans, with the impeller covered by a mechanical casing, and the center of the impeller being the intake. As the medium-pressure fan operates, the power equipment drives the impeller to rotate, drawing air into the intake. During the rotation of the centrifugal fan blades, they exert dynamic force on the gas, increasing its pressure and velocity, and the gas is discharged from the exhaust port along the impeller channels under the action of centrifugal force.
During operation, although the rotation of the impeller increases the pressure and velocity of the gas, the various changes in the gas are relatively small. Therefore, in the design and use of centrifugal fans, the gas is usually treated as an incompressible fluid. The gas treatment process of medium-pressure fans is completed within the same radial plane, hence the term "axial flow centrifugal fan" for medium-pressure fans.
Technical Parameters: Among the technical parameters of medium-pressure fans, the most important ones to consider during selection are gas flow rate, pressure, power transmission, efficiency, and impeller speed. The gas flow rate parameter of a medium-pressure fan represents the volume of gas the fan can process in a unit of time, while the pressure of a medium-pressure fan refers to the internal gas pressure value during its operation.
The efficiency of a medium-pressure fan refers to the ratio between the shaft power of the fan and the effective power of the actual gas being processed. The total pressure efficiency of centrifugal fans is approximately 90%, and in the future development of centrifugal fans, efficiency values will be one of the goals that researchers will further pursue.
Medium-pressure fans are widely used for dust extraction and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; ventilation and exhaust in boiler and industrial furnace chimneys; cooling and ventilation in air conditioning equipment and home appliances; drying and sorting of grains; air source for wind tunnels and inflation and propulsion of air cushion vessels, etc.
