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(Selection of Roots blower) According to what classification are the models of Roots blower selected?

Source: Roots blower manufacturer Published on: February 21, 2022 Hits:

    Roots Blower It consists of five parts: casing, wallboard, impeller, oil tank and muffler. Casing: mainly used for supporting (wallboard, impeller, muffler) and fixing. Wall plate: mainly used to connect the casing and the impeller, support the rotation of the impeller, and play the role of end sealing. Impeller: it is the rotating part of Roots blower, which is divided into two leaves and three leaves. However, due to the advantages of three leaves, such as less air pulsation, less noise, and more stable operation than two leaves, it has gradually replaced the two leaves Roots blower. Oil tank: mainly used to store lubricating oil used to lubricate gears and bearings. Muffler: It is used to reduce the noise caused by air flow pulsation during the inlet and outlet of Roots blower.

Roots blower is a type of volumetric fan. There are two three blade impellers that rotate relatively in the space sealed by the casing and wall plate. Since each impeller is involute or the envelope of the epicycloid, the three blades of each impeller are identical, and the two impellers are identical, which greatly reduces the processing difficulty. Numerical control equipment is used during impeller processing to ensure that a certain minimum clearance can be maintained no matter where the two impellers rotate, under the condition that the center distance between the two impellers is constant, so as to ensure that the gas leakage is within the allowable range.
The two impellers rotate in opposite directions. Because the clearance between impellers and impellers, between impellers and casings, and between impellers and wallboards is very small, a vacuum state is formed at the air inlet. The air enters the air inlet chamber under the action of atmospheric pressure. Then, two of the blades of each impeller form a sealed chamber with wallboards and casings, The sealing chamber formed by two blades is constantly taken to the exhaust chamber, and because the impellers in the exhaust chamber are meshed with each other, the air between the two blades is squeezed out. In this way, the air is continuously transmitted from the air inlet to the air outlet, which is the whole working process of Roots blower.
     

Selection of Roots blower

1. By caliber and model
According to the caliber model, it can be divided into: 50 caliber model, 65 caliber model, 80 caliber model, 100 caliber model, 125 caliber model, 150 caliber model, 175 caliber model, 200 caliber model, 250 caliber model, 300 caliber model, 350 caliber model. Whether it is a three blade Roots fan or a two blade Roots fan, there are basically so many caliber models. According to these models, only approximate models can be selected, but not accurate models.
2. By motor power
According to motor power, it can be divided into: 0.55kw, 0.75kw, 1.1kw, 1.5kw, 2.2kw, 3kw, 4kw, 5.5kw, 7.5kw, 11kw, 15kw, 18.5kw, 22kw, 30kw, 37kw, 45kw, 55kw, 75kw, 90kw, 110kw, 132kw, 160kw, 185kw, 200kw, 220kw, 250kw, 280kw, 315kw, 355kw, 400kw, etc.
Because there are many models of motor power and many non-standard motors, Roots blower will also select many models based on motor power, and many models can be selected for the same motor power.
3. Score according to parameters
If it is distinguished according to single parameters, such as air volume, pressure, speed, etc., the model selection table will list more models. Because there are too many parameters, it is impossible to provide them one by one. So, if you have friends who need them, you can download the model selection table of three blade roots blower here and make your own choice.
Simply select the fan. In order to ensure the accuracy of the model, we can determine the parameters such as air volume, pressure and motor power. Several parameters can be accurately selected to a certain model, which is also a general selection principle in the market.
Experienced friends go to consult about purchasing, and we will find that the manufacturer will ask many questions, such as: how much air volume, how much pressure, how much motor power, what kind of sealing method, whether frequency conversion, what is the conveying medium, etc. These are all for the purpose of accurate selection. Some questions can be consulted to directly determine whether it belongs to Roots blower series.
Under the same working condition, when the air volume and pressure are appropriate, both Roots fan and other fans can be selected, such as aeration fan, which can be Roots type, centrifugal type or high-pressure fan.