Working Principle:
Common medium-pressure blowers are centrifugal blowers, with the impeller covered by a mechanical casing and the intake port located at the center of the impeller. As the medium-pressure blower operates, the power unit drives the impeller to rotate, drawing air in through the intake port. During the rotation of the centrifugal blower's blades, a dynamic force is exerted on the gas, increasing its pressure and velocity. Under the action of centrifugal force, the gas is discharged along the blade channels through the exhaust port.
During operation, although the rotation of the impeller in a medium-pressure fan 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 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 fan is also known as an axial flow centrifugal fan.
Technical Specifications: In the technical parameters of medium-pressure fans, the most important factors to consider during selection are gas flow rate, pressure, power transmission, efficiency, and impeller speed. The gas flow rate parameter of a medium-pressure fan represents the volume of gas the fan can handle 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 handled. The total pressure efficiency of centrifugal fans is roughly around 90%, and in the future development of centrifugal fans, efficiency values will be one of the targets researchers further pursue.
Centrifugal fans are widely used for dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; for ventilation and exhaust in boilers and industrial furnaces; for cooling and ventilation in air conditioning equipment and household appliances; for drying and sorting grains; for wind tunnel air supply and for inflating and propelling air cushion vessels.
