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How does the pressure of Roots blower come from, and how does the selection of Roots blower come from?

Source: Roots blower manufacturer Published on: February 22, 2022 Hits:
In fact, the fan itself does not generate pressure, as mentioned above, Roots Blower It can only rotate the wind. The fan itself has no internal compression and will not generate any pressure. Where does the pressure come from? In fact, its pressure comes from the system back pressure connected to the rear of the fan. It is easy to understand that you can imagine that the front end and rear end of the fan are open, that is, they are inhaled from the atmosphere and discharged into the atmosphere. Then you can imagine that if a pressure gauge is installed at the exhaust end, the pressure gauge will display zero pressure. But if you connect the exhaust end to a sealed tank, the fan will turn on, because the fan keeps supplying air to the tank, and then the pressure displayed on the pressure gauge at the exhaust end keeps rising. Because the air volume of the fan is large, only the speed is related, so no matter how the pressure at the exhaust end rises, as long as the fan speed is constant, the exhaust pressure will continue to rise, Until the load stops.

 

Roots Blower

Roots blower has three or two leaves. The principles are actually the same. Through the rotation of the impeller, the volume of air is forced from the intake end to the exhaust end, ignoring the return flow (related to the exhaust pressure, speed, temperature, etc., but the quantity is small), and each fan is transported. The air volume is constant, so the air volume of the fan is actually proportional to the fan speed. The higher the speed, the greater the air volume. Moreover, the air volume is almost only related to the speed (ignoring the above factors). In short, it is a displacement machine, which can push the wind from the inlet end to the exhaust end.

Roots blower is a positive displacement fan. There are two three blade impellers rotating relative to each other in the space sealed by the shell and the wallboard. Because each impeller is an involute or epicycloid envelope. The three blades of each impeller are the same, and the two impellers are the same, which greatly reduces the processing difficulty. Numerical control equipment is used in the process of impeller processing to ensure that the two impellers can maintain a small gap regardless of the position of the two impellers when the center distance is constant, so as to ensure that the gas leakage is within the allowable range.
The two impellers rotate in opposite directions. Because the gap between the impeller and the impeller, the impeller and the housing, and the impeller and the wall plate is very small, the air inlet forms a vacuum state. The air enters the air inlet chamber under the effect of atmospheric pressure. Then, the two blades of each impeller form a sealing chamber with the wall plate and the housing, The air in the air inlet chamber continuously enters the air outlet chamber through the seal. During the rotation of the impeller, the two blades form a cavity. The impellers in the air chamber mesh with each other, so that the air between the two blades is squeezed out, allowing continuous operation. The air is continuously sent from the air inlet to the air outlet. This is the whole working process of Roots blower.