How Do Roots Blowers Work

Roots blowers work by using a pair of rotating lobed impellers or rotors to convey air, gas or other fluids. The impellers are connected by a shaft and rotate in opposite directions inside a close-fitting housing that contains no air inlets or outlets except for the inlet and outlet ports. When the impellers rotate, air is drawn into the blower through the inlet port and trapped between the rotors and the housing and then is forced to the outlet port.

The impellers create a series of crescent-shaped pockets as they rotate, trapping air and pushing it from the inlet to the outlet. As each pocket passes through the inlet port, it fills up with air, and as it rotates, the pocket compresses the air until it reaches the outlet port, where the air is discharged.

Roots blowers are positive displacement pumps that work on the principle of air or gas being trapped inside the pockets and the pressure differential between the inlet and outlet ports. They are often used in industrial systems where high volume and low-pressure requirements are essential, such as in wastewater treatment plants, power plants, and industrial pneumatic conveyance systems.