Roots blower is a displacement fan, and the air volume delivered is proportional to the number of revolutions. Two impellers suck and exhaust three times every time the three blade impeller rotates. Compared with the two blade type, the gas pulsation is small, the vibration is small, and the noise is low. There is always a small gap between the impeller on the two shafts of the fan and the hole surface in the elliptical housing, between the impeller end face and the front and rear end covers of the fan, as well as between the fan impellers. Driven by the synchronous gear, the air is transported from the air inlet of the fan to the exhaust side along the inner wall of the housing. The fan cavity does not need lubricating oil, has simple structure, smooth operation, stable performance, and is suitable for many purposes, and has been used in a wide range of fields.
Characteristics of Roots blower: due to the three blade rotor structure and the reasonable structure at the inlet and outlet of the housing, the blower has low vibration and noise. The impeller and shaft are of integral structure, and the impeller is free of wear. The performance of the fan is permanent and can operate continuously for a long time. The fan has large volume utilization rate, high volume efficiency, compact structure and flexible installation mode. The selection of bearings is more reasonable, and the service life of each bearing is even, thus extending the life of the fan! The fan oil seal is made of imported fluororubber material, which is high temperature resistant, wear-resistant and has a long service life. Complete models can meet the needs of different users for different purposes. It is well known that when the back pressure of the three leaf roots blower is too large, the blower will not start, and after running, it will suffocate directly.
1. Pipe blockage
After the pipe is blocked, the fan will exhaust normally as usual. After starting up, serious overpressure will occur. In this case, the blockage in the pipe should be cleaned in time to restore ventilation.
2. Too many elbows
If there are too many bends in the pipeline, the back pressure of the fan will be increased invisibly, which will cause the phenomenon of overpressure of the fan. If there are too many bends in the fan, the fan pipeline shall be arranged properly to minimize the number of bends.
3. Select smaller model
After the model is selected to be smaller, the fan will be in an overpressure state. Under the condition that the air volume can be met, it is necessary to increase the bypass outlet and reduce the back pressure of the fan. This is an effective method. Long term overpressure operation will lead to fan failure.
4. Reverse installation of check valve
The reverse installation of the check valve is not only a problem of overpressure, but also the motor may burn out in a short time. Therefore, when closing the vent valve, slowly close it to check whether the pressure gauge of the fan is overpressure. If overpressure occurs before it is completely closed, power off in time to check.
5. Gate valve is not opened
When Roots blower starts, it needs to start with no load. Some customers only open part of the gate valve before opening it, which will naturally lead to overpressure operation of the blower.
I believe that after reading the above, you should also understand the main reasons for the excessive back pressure of Roots blower. I hope it will be helpful to you.
Text label: Roots blower
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