Main advantages and disadvantages of Roots blower for sewage treatment:

Main advantages of Roots blower for sewage treatment include:
1. Stability
The three positive bearings adopt the combined form of pad bearing and ball bearing. The pad bearing supports the main load, and the ball bearing plays an auxiliary role in the process of startup and shutdown. Both ensure full stability and durability of blower operation under high load conditions of high-speed rotation. Air bearing is indeed a further technology, but when rotating at high speed, the friction phenomenon of the bearing is serious when starting and stopping, leading to bearing wear. Because air is less viscous than oil, high temperature resistant, pollution-free, but its load capacity is lower than oil; Bearing and rotor are air as media, which directly leads to large clearance between impeller and volute and poor stability.  
2. Efficiency
　　

The Sanzheng impeller is manufactured according to the needs of each user according to the power analysis and other instruments, rather than the stereotyped casting impeller, so as to achieve the highest efficiency. Large, medium and small impellers can be manufactured. According to the characteristics of composite bearing, the clearance between impeller and volute is small, achieving high efficiency. The thrust air bearing has a large amount of damping, so it is difficult to adjust the clearance between the impeller and the shroud. The large spacing between the impeller and the shrouds can cause the efficiency to decrease by about 10%.

Main disadvantages of Roots blower for sewage treatment include:

one The structure of the machine body is complex, and the unit has auxiliary mechanisms and settings such as lubricating oil station and gear gearbox;

two High speed and noise;

three Complex control and difficult operation;

four The fan is prone to vibration;

five The maintenance work is heavy and difficult.

The disadvantages of Roots blower for sewage treatment summarized above are all relative to multistage centrifugal blower. Although it seems to have many disadvantages, in fact, in many low-pressure occasions, Roots blower for sewage treatment is the best choice. Moreover, it can always occupy a place in the large family of centrifugal fans, which is enough to prove that it has great use value.