Operating Principle:
Common medium-pressure fans are centrifugal fans, with the impeller covered by a mechanical casing and the intake port located at the center of the impeller. When the medium-pressure fan operates, the power equipment drives the impeller to rotate, drawing air into the intake port. As the blades of the centrifugal fan rotate, they impart dynamic force to the gas, increasing its pressure and speed, and the gas is ejected from the exhaust port along the impeller channel due to centrifugal force.
During operation, although the impeller's rotation 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 treatment process 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 Specifications: Among the technical parameters of medium-pressure fans, the most important factors 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 in a unit of time, while the pressure refers to the internal gas pressure within the fan during operation.
The efficiency of medium-pressure fans refers to the ratio between the shaft power and the effective power of the actual gas handled. 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 targets researchers continue to pursue.
Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for dust and air exhaust, as well as for cooling. They are also employed in the ventilation and exhaust of boilers and industrial furnaces; in cooling and ventilation systems of air conditioning and household appliances; for grain drying and conveying; and for inflating and propelling air cushions and hovercrafts, etc.
