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. As the medium-pressure fan operates, the power unit drives the impeller to rotate, drawing air into 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 from the exhaust outlet along the impeller channels.
During operation, although the rotation of the impeller in a medium-pressure blower increases the pressure and velocity of the gas, the various change amounts are relatively small. Therefore, in the design and operation of centrifugal blowers, the gas is typically treated as an incompressible fluid. The gas processing of medium-pressure blowers is completed within the same radial plane, hence the term "axial flow centrifugal blower" for medium-pressure blowers.
Technical Parameters: Among the technical specifications of medium-pressure fans, the most important factors to consider are gas flow rate, pressure, power transmitted, 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 a medium-pressure fan refers to the ratio between the shaft power of the fan and the effective power of the actual gas it processes. The full pressure efficiency of centrifugal fans is approximately 90%, and in the future development of centrifugal fans, the efficiency values will be one of the goals researchers will further pursue.
Medium-pressure fans are extensively 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.
