What are the differences between high pressure centrifugal fans and Roots fans?

 Centrifugal fan is a kind of driven fluid machinery that depends on the input mechanical energy to improve the gas pressure and send gas side by side. Centrifugal fan is a kind of constant pressure fan, and the relation between the outlet air pressure and the speed is square And the air volume changes with the resistance and load of the external pipe. Roots fan is a positive displacement fan, and there is always a small gap between the end face of the impeller and the front and rear end covers of the fan and the fan impeller, and the downwind is transported from the fan inlet along the inner wall of the shell to the discharge driven by the synchronous gear The Roots fan belongs to the constant flow fan, whose air volume is proportional to the speed, and the outlet air pressure changes with the resistance and load of the external pipe. High efficiency magnetic levitation blower Because the wind pressure of Roots fan does not change with the speed, the range of flow adjustable is larger, especially in the case of low speed and low air volume. Because the wind pressure and speed are square, the speed of high pressure centrifugal fan is adjusted to low pressure The force will drop rapidly. If the pressure provided by the fan cannot overcome the resistance brought by the dust collector and piping system, the crushing system will not be able to operate, resulting in material blocking. And Roots fan even at low speed, still Can provide sufficient pressure to ensure the stable operation of the system.