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The difference between Roots Fan and centrifugal Fan

Wuxi JN Fan Co.,Ltd | Updated: Jun 30, 2018
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Roots blower is a volumetric fan, conveying air volume in proportion to the number of revolutions, the impeller end face and the fan front and rear end cover and between the fan impeller between those who always maintain a small clearance, The underwind is driven by the synchronous gear from the fan inlet to the side of the outlet along the inner wall of the shell.

Centrifugal fan is a kind of driven fluid machine, which can increase the pressure of gas and transfer gas side by input mechanical energy. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust removal and cooling;

Differences between Roots Fan and centrifugal Fan:

1, the working principle is different. The centrifugal fan uses the curve wind blade. The gas is flung to the shell by centrifugal force, and the roots blower is used in two 8 shaped wind blades. The gap between them is very small, and the gas is squeezed by two blades, and the gas is squeezed to the air outlet.

2. Because of the different working principle, their working pressure is different, the outgassing pressure of Roots fan is higher, and the centrifugal fan is smaller.

3, the air volume is different, generally the Roots fan is used in the place where the air volume requirement is not great but the pressure requirement is high, while the centrifugal fan is used in the place where the pressure requirement is low and the air volume requirement is large.

4. Manufacturing accuracy is different. Roots fan requires high precision and strict assembly requirements, while centrifugal fan is relatively loose. Of course, there are some small differences will not be said.

5. Use a Roots blower if the load requires a constant flow effect. 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 change of the pipe and load, and the change of the air volume is very small. Roots blower is a kind of high pressure fan. Roots blower is a volumetric blower, the air volume is proportional to the number of spins, and the gas is transported from the inhaled side to the discharged side. Use a centrifugal fan if the load requires a constant pressure effect. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure. The output air volume varies with the change of the pipe and load, but the wind pressure does not change much. Centrifugal fan, the wind pressure is not big. The compression of air is usually carried out by several working impellers (or stages) under centrifugal force. Centrifugal fan belongs to square torque characteristic, while Roots fan basically belongs to constant torque characteristic.

6, the roots blower generally has a large air volume, and the pressure is relatively large, and the noise of the roots blower is also large. If the air volume is small and the noise is higher, a rotary blower is selected. The rotary blower also belongs to the constant flow fan, the main parameter of the work is the air volume, the output pressure changes with the change of the pipe and the load, the change of the air volume is very small, the rotary fan is the variable volume compression, its main characteristic is: low rotational speed, low noise, Low vibration, high efficiency, high energy saving.http://www.jnblower.com/


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