Operating 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. When 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, a dynamic force is exerted on the gas, increasing its pressure and velocity. The gas is then expelled from the exhaust outlet along the impeller channel under the influence 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 typically treated as an incompressible fluid. The gas processing of medium-pressure fans is always 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 are gas flow rate, pressure, power transmitted, 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. 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 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 boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and sorting of grains; wind tunnel air sources, air cushion ship inflation, and propulsion, etc.
