Working Principle:
Common medium-pressure fans are centrifugal fans, with the impeller covered by a mechanical casing, and the center of the impeller serving as the intake. As the medium-pressure fan operates, the power unit drives the impeller to rotate, drawing air into the intake. During rotation, the blades of the centrifugal fan impart dynamic force to the gas, increasing its pressure and velocity. Under the action of centrifugal force, the gas is expelled from the exhaust port along the impeller channel.
During operation, although the rotation of the impeller increases the pressure and velocity of the gas, the various change amounts of 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 medium-pressure fans are also known as radial flow centrifugal fans.
Technical Specifications: Among the technical parameters of medium-pressure fans, the most important factors to consider during selection include gas flow rate, pressure, power delivered, efficiency, and impeller speed. The gas flow rate of a medium-pressure fan represents the volume of gas the fan can handle per unit of time, while the pressure refers to the internal gas pressure value during the operation of the medium-pressure fan.
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 researchers continue to 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 for boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and sorting of grains; wind tunnel air supply and air cushion ship inflation and propulsion, etc.
