High pressure fan maintenance knowledge sharing

The working principle of a centrifugal blower is similar to that of a centrifugal blower, except that the compression process of air is usually carried out through several working impeller (or several stages) under the action of centrifugal force. The blower has a high-speed rotating rotor, and the blade on the rotor drives the air to move at a high speed. Centrifugal force makes the air flow to the outlet of the blower along the involute shape housing, and the high-speed airflow has a certain wind pressure. New air is supplied from the center of the housing.

Working principle of single stage high speed centrifugal fan is: engine by high speed rotation shaft to drive the impeller, axial airflow by imports after entering the high-speed rotating impeller into radial flow is accelerated, and then into the cavity expansion pressure, change flow direction and reduction, the reduction effect will be in the high speed rotating airflow with kinetic energy into pressure energy (potential energy), make the fan exports stable pressure.

Theoretically speaking, the pressure-flow characteristic curve of the centrifugal blower is a straight line, but due to the friction resistance and other losses inside the blower, the actual pressure-flow characteristic curve drops gently with the increase of the flow rate, while the corresponding power-flow curve of the centrifugal blower rises with the increase of the flow rate. When the fan runs at a constant speed, the operating point of the fan will move along the pressure-flow characteristic curve. The operating point of the fan depends not only on its own performance, but also on the characteristics of the system. When the resistance of the pipe network increases, the performance curve of the pipe line will become steeper. The basic principle of fan regulation is to obtain the required working condition by changing the performance curve of the fan itself or the external tubular curve.