Kunshan Sheng Tang ventilation introduction: 

Roots fan and centrifugal fan difference Roots fan is a positive displacement fan, the air volume is proportional to the number of revolutions, the impeller end face and the fan before and after the end cover and between the fan impeller always maintain a small gap, driven by the synchronous gear The air is transported from the fan inlet to the exhaust side along the inner wall of the shell. 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 fans are widely used in factories, mines, tunnels, cooling towers, vehicles, Ventilation, dust removal and cooling of ships and buildings; Ventilation and ventilation of boilers and industrial furnaces; The difference between Roots fan and centrifugal fan 1. The working principle is different. The centrifugal fan uses a curved blade to throw the gas to the casing by centrifugal force, while the Roots fan uses two figue-8 blades, and the gap between them is very small, by two blades To squeeze gas to an outlet. 2, because of the different working principles, generally their working pressure is different, the output pressure of Roots fan is relatively high, and the centrifugal fan is relatively small. 3. Different air volume, generally Roots fans are used in places with small air volume requirements but high pressure requirements, and centrifugal fans are used in places with low pressure requirements and large air volume requirements. 4. Manufacturing accuracy is not the same. Roots fan requires high precision and strict assembly requirements, while centrifugal fan is relatively loose. There are a few minor differences, of course. 5. If the load needs the constant flow effect, the Roots blower is used. Because Roots blower is a constant flow fan, the main parameter of work is the air volume, the output pressure changes with the pipeline and load And the change, the change in air volume is very small. Roots blower is a high pressure fan. Roots blower is a positive displacement fan. The volume of air transported is proportional to the number of revolutions, and the gas is transported from the suction side to the discharge side. Such as If the load needs the constant pressure effect, the centrifugal fan is used. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure. The output air volume changes with the changes of the pipeline and the load, and the wind pressure changes Not much. Centrifugal fan with low wind pressure. The process of air compression is usually carried out by several working impellers (or several stages) under the action of centrifugal force. Centrifugal fans belong to the square torque characteristics, while Roots The fan basically belongs to constant torque characteristics. 6, Roots blower generally speaking, the air volume is relatively large, the pressure is also relatively large, the noise of Roots fan is also very big, if the air volume is relatively small, the noise requirement is relatively high, the rotary blower is selected, rotary Type blower is also a constant flow fan, the main parameter of the work is the air volume, the output pressure changes with the pipeline and load changes, the air volume changes very little, rotary fan is varactor compression, its main characteristics are: Low speed, low noise, low vibration, high efficiency, high energy saving. Fans are commonly used in sewage treatment First, sewage treatment fan - Roots fan, if the load needs to be a constant flow effect, Roots blower is used. Because Roots blower is a constant flow fan, the main parameters of the operation are the air volume and the output pressure The force varies with the pipe and load, and the air volume changes very little. Roots blower is a high pressure fan. Roots blower is a positive displacement fan. The volume of air transported is proportional to the number of revolutions, and the gas is transferred from the suction side To the discharge side. Two, sewage treatment fan - centrifugal fan if the load needs to be constant pressure effect, centrifugal fan is used. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure, the output air volume with the pipeline and The load changes with the wind pressure changes little. Centrifugal fan with low wind pressure. The process of air compression is usually carried out by several working impellers (or several stages) under the action of centrifugal force. Centrifugal wind The machine belongs to the square torque characteristic, while Roots fan basically belongs to the constant torque characteristic. Three, sewage treatment fan - rotary fan, Roots blower generally speaking, the air volume is larger, the pressure is larger, the noise of Roots fan is also large, if the air volume is smaller, the noise requirement is higher, it is Choose rotary blower, rotary blower is also a constant flow fan, the main parameter of the work is the air volume, the output pressure changes with the pipeline and load changes, the air volume changes very little, rotary fan is varactor Compression, its main characteristics are: low speed, low noise, low vibration, high efficiency, high energy saving.