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 inlet. As the medium-pressure fan operates, the power equipment drives the impeller to rotate, drawing air into the inlet. During the rotation of the centrifugal fan blades, they exert dynamic force on the gas, increasing its pressure and velocity, and the gas is expelled from the exhaust outlet along the blade channel under the action of centrifugal force.
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 processing of medium-pressure fans is all completed within the same radial plane, hence the medium-pressure fans are also known as radial flow centrifugal fans.
Technical Parameters: Among the technical parameters of medium-pressure fans, the most important factors to consider during selection include gas flow rate, pressure, power output, efficiency, and impeller speed. 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 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 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 for boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selection of grains; wind tunnel air supply and air cushion ship inflation and propulsion, etc.
