Centrifugal Blower and Roots Blower main difference and how to choose

Centrifugal Blower and Roots Blower in the pneumatic conveying of powder and granular materials are more widely used fan types, many people, although they know that they need to distinguish between the application occasions, but for the two kinds of fans between the principle of manufacturing, the difference between the parameters instead of a half-understanding.

Centrifugal Blower and the difference between the Roots Blower, mainly the following points:

Difference 1: working principle Centrifugal Blower is the use of curved blades, and then rely on centrifugal force will be sent to the gas casing, while the Roots Blower, is the use of zigzag blades, is through the squeeze will be squeezed to the gas outlet.

Difference 2: Place requirements Centrifugal Blowers are mainly used in places where the pressure is low and the air volume is large, while Roots Blowers are used in places where the pressure is high and the air volume is small.

Difference 3: manufacturing accuracy The manufacturing accuracy of Centrifugal Blower is not high, while the manufacturing accuracy of Roots Blower is relatively high.

Difference 4: Parameters The load requirement of Centrifugal Blower is constant pressure, so it is a kind of constant-pressure fan, the change of its wind pressure is not big, and it has the characteristic of square torque. Roots Blower is a kind of constant flow fan, its main parameter is the air volume, and the air volume change is very small. Moreover, Roots Blower is a high-pressure fan, which is proportional to the amount of air conveyed and the number of revolutions.

How to choose

If the load requires a constant flow effect, use a Roots blower. Because the Roots blower belongs to the constant flow fan, the main parameter of the work is the air volume, the output pressure changes with the pipeline and the load changes, the air volume changes are very small. Roots Blower is a kind of high-pressure fan, Roots blower is a volumetric fan, the air volume delivered is proportional to the number of revolutions, and the gas is transported from the inhaled side to the discharged side. Centrifugal Blowers are used if the load requires a constant pressure effect. Because the Centrifugal Blower is a constant pressure fan, the main parameter of the work is the wind pressure, the output of the air volume changes with the change of the pipeline and the load, the wind pressure does not change much. With Centrifugal Blowers, the air pressure is not large. The compression of air is usually carried out by centrifugal force through several working impellers (or stages). Centrifugal Blowers have a square torque characteristic, whereas Roots Blowers basically have a constant torque characteristic.