In fact, Roots blower itself does not produce pressure. Roots blower is only used for rotary air transmission. The blower itself does not have internal compression and does not produce any pressure. In fact, its pressure comes from the system back pressure connected at the rear end of the fan. The front and rear ends of the fan are open, that is, the fan absorbs air from the atmosphere and exhausts air to the atmosphere. If a pressure gauge is installed at the exhaust end, the pressure displayed on the pressure gauge is 0. But if a sealed tank is connected to the exhaust end, the fan will start as soon as the fan is turned on, because the fan keeps supplying air to the tank, then the pressure displayed on the pressure gauge at the exhaust end will not rise continuously, Because the air volume of the fan is only related to the rotation speed, no matter how the pressure at the exhaust end rises, as long as the rotation speed of the fan remains unchanged, the exhaust pressure will continue to rise until it exceeds the load for shutdown.
The outlet pressure of Roots blower is 9.8kpa, which is the design pressure. That is to say, in the design stage, it is calculated according to the system resistance at the rear end plus a certain margin. In actual operation, it should be lower than this pressure. The change from DN50 to DN80 actually reduces the pipeline loss, and the pressure should be reduced to a certain extent, but for the fan, there must be no problem. If the pipe is smaller, it will increase the rear pressure, which will increase the load of Roots blower, exceeding the design capacity.
The exhaust pressure of the positive displacement blower does not depend on the blower itself, but on the device after the blower is discharged, that is, the so-called "back pressure". The aeration blower has the characteristics of forced gas transmission.
The exhaust pressure marked on the nameplate of Roots blower is the rated exhaust pressure of the blower. In fact, the blower can work at any pressure lower than the rated exhaust pressure, and can also work above the rated exhaust pressure as long as the strength and exhaust temperature allow.
For the sewage treatment plant, the absolute pressure (back pressure) generated by the exhaust system is the sum of the pressure loss value of the pipeline system, the depth of the aeration tank and the ambient atmospheric pressure. If for some reason, such as the aeration head or the pipeline is blocked, the pressure loss of the pipeline system will increase, and the back pressure will also increase, so the pressure of the blower will increase accordingly; In addition, if the aerator breaks or the pipeline leaks, the pressure loss of the pipeline system will be reduced, the back pressure will continue to decrease, and the pressure of the blower will also decrease.
I believe that after reading the above, you should also know how to solve the outlet pressure problem of Roots blower. I hope it will help you.
Text term label: Roots blower
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