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 unit drives the impeller to rotate, drawing air in through the intake. During the rotation of the centrifugal fan blades, they impart dynamic force to the gas, increasing its pressure and velocity. Under the action of centrifugal force, the gas is expelled along the blade channels through the exhaust outlet.
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 typically 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" is also used for medium-pressure fans.
Technical Parameters: In the technical specifications of medium-pressure fans, the most important factors to consider are gas flow rate, pressure, power transmission, efficiency, and impeller speed, all of which are crucial during the selection process. The gas flow rate parameter of a medium-pressure fan represents the volume of gas the fan can handle within a unit of time, while the pressure of a medium-pressure fan refers to the internal gas pressure during its operation.
The efficiency of medium-pressure fans refers to the ratio of the shaft power to the actual effective power of the gas being processed. The full-pressure efficiency of centrifugal fans is approximately 90%, and in the future development of centrifugal fans, efficiency values will be one of the targets further pursued by researchers.
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 boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and sorting of grains; wind tunnel air sources, and inflation and propulsion of air cushion vessels.
