What are the characteristics of Roots blower or rotary blower for sewage treatment?

rotation drum Fan and Roots drum Fan They are widely used in biological sewage treatment, as aeration and oxygenation equipment, and have overlapping uses in other fields. However, for users who are not familiar with fan performance, it is not clear how to select a fan suitable for their own working conditions at the beginning. Let's see how to select a suitable fan according to the characteristics of these two fans. To understand Roots Blower and Rotary fan First, let's understand the structure and working principle of the two fans.

Let's get to know Rotary blower Structure and working principle, Rotary blower It is mainly composed of six parts: motor, air transition device, blower body, air chamber, base (also used as oil tank) and oil drip nozzle. The pressure range is 0.1-0.5kgf/cm2, belonging to medium pressure fan. In the blower cylinder, the rotor operates eccentrically, and the four uniformly distributed blades in the rotor slot absorb, compress and discharge air with the rotation of the rotor. At the same time, during operation, the pressure difference of the blower automatically sends the lubricating oil to the oil drip nozzle and drops it into the cylinder to reduce friction and noise. Therefore, the rotary fan is a low-noise fan, which can keep the gas in the cylinder from backflow, and the gas output will contain a trace of oil.

Now let's understand the structure and working principle of Roots blower. Roots blower is a high-pressure blower with a pressure range of 0.1-0.8kgf/cm2. Roots Blower There are two blade rotors in the cylinder, two blade rotors and three blade rotors. For each rotation of the rotor, three times of suction and exhaust shall be carried out. A small gap shall always be kept between the two impellers and the inner hole surface of the oval cylinder. The rotor rotates at a constant speed in the opposite direction without internal oil lubrication. The gas surrounded by the cylinder and impeller is transmitted from the suction side to the discharge side. So, Roots Blower Stable operation, stable performance, no oil in the output gas.

Conclusion: When used in projects with strict requirements on equipment noise, Rotary fan The low noise characteristic of the water treatment plant shows obvious advantages, so it is often used for small sewage treatment with low pressure (below five meters of water depth) or for integrated water treatment equipment rotation type Fan It is suitable, low cost and economical. However, in many small and medium-sized sewage treatment projects with high pressure (especially those with water depth of more than five meters), when the required air volume is large, choose Roots drum Fan 。 And because Roots Blower There is no oil lubrication inside, and the output air does not contain any oil. Like the vortex fan, it will not pollute the water body, and is also widely used for the mechanization of aquaculture.