Working principle of Roots air blower

Roots air blower is a constant volume fan, the air volume is proportional to the number of revolutions, and the three-blade impeller absorbs and exhausts air three times by two impellers every time it rotates. Compared with the two-blade impeller, it has less gas pulsation, less load change, high mechanical strength, low noise and small vibration. There are two trilobal impellers on the two parallel shafts. There is always a small gap between the wheel and the inner hole surface of the elliptical box and between the impellers.

Because the impellers rotate in opposite directions at a constant speed, a certain amount of gas surrounded by the box and the impeller is transported from the suction side to the discharge side. Each impeller is always kept in the correct phase by the synchronous gear, so it will not touch each other, so it can be high-speed, does not need internal lubrication, and has the advantages of simple structure, stable operation, stable performance, suitable for a variety of purposes, and has been used in a wide range of fields.