Operating Principle:
Common medium-pressure fans are centrifugal fans, with the impeller covered by a mechanical casing and the inlet at the center of the impeller. As the medium-pressure fan operates, the power unit 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 through the outlet 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 change amounts are relatively small. Therefore, in the design and use of centrifugal fans, the gas is usually treated as an incompressible fluid. The gas processing of medium-pressure fans is completed within the same radial plane, hence they are also known as radial flow centrifugal fans.
Technical Specifications: Among the technical parameters of medium-pressure fans, the most important ones to consider during selection are the gas flow rate, pressure, power output, 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 within the fan during 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 removal 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 selection of grains; air tunnel air source and air cushion ship inflation and propulsion, etc.
