The flow of roots blower is related to the speed of roots blower, internal clearance of blower, system resistance and pipe tightness. The higher the speed, the greater the flow; The larger the internal clearance or resistance, the smaller the flow; If the pipeline leaks, the flow will drop. Therefore, if a Roots blower is properly selected, insufficient flow will occur after a period of operation.
The flow of Roots blower is positively correlated with the speed. If the flow rate decreases, then one possibility is that the speed decreases, and the reason for the maximum speed decrease is the belt slipping. There are two connection modes between roots blower and motor, one is direct connection, that is, coupling connection, and the other is belt connection, that is, belt pulley connection. For the fan with belt coupling, if the belt slips on the pulley, the rotation speed of the fan will drop, resulting in a drop in flow and failure to establish the required pressure. Therefore, if it is found that the flow of the fan decreases and the pressure fails to meet the requirements, check the belt pulley connecting the fan and the motor, tension the belt, or replace the belt and increase the number of belts to ensure that the fan speed is normal.
The increase of resistance in the system where Roots blower is located will also lead to the decrease of fan flow. Therefore, if the flow of the fan is insufficient, it is necessary to check the inlet filter - the inlet filter blockage will cause increased air inlet resistance. Once the inlet filter is found to be blocked, clean the filter and adjust the inlet pressure to the specified value.
Pipe leakage is also a major culprit for the flow decline of Roots blower. Therefore, part of the flow loss can be recovered by checking the pipeline, fastening the connection parts, and repairing the leaking parts.
The flow of Roots blower decreases with the increase of internal clearance of blower. That is, the flow drop may also be caused by the larger internal clearance of the blower, and the important reason for the larger internal clearance of the blower is the wear of the impeller. Therefore, if the culprit of flow decline cannot be found in other factors, the fan should be disassembled to see if the impeller is worn. Transporting corrosive gas, too much dust, high air humidity, etc. may lead to wear of the impeller and larger internal clearance of the fan. If this is the case, adjust the internal clearance of the fan, or even replace the rotor.
The volume flow of Roots blower under standard and service conditions is constant, but because of the air density（ ρ) 、 The moisture content (ds) has changed, resulting in an increase in the oxygen supply (FOR) from the blower to the aeration tank when the temperature decreases in winter and a decrease in summer. With the increase of air density, the mass flow of dry air supplied by Roots blower will increase significantly compared with the standard state, which will lead to the increase of oxygen supply. From the actual measurement of operation, the dissolved oxygen in the aeration tank in winter is 1~3mg/L higher than that in summer every year.
Therefore, during the production and operation of Roots blower, the equipment needs to be adjusted in time according to this change, so that the oxygen filling capacity of Roots blower can adapt to the actual oxygen demand in operation. For Roots blower, it is economical and practical to use frequency converter to adjust the air supply volume by changing the fan speed. When used in plateau areas, the ambient atmospheric pressure will also change, and the pressure ratio will increase accordingly. Then, the leakage flow qvb of roots blower will increase, which will lead to the reduction of air volume flow supplied by the blower, and may also lead to insufficient oxygen supply.
During the operation of fan, the phenomenon of excessive or insufficient flow often occurs. There are many reasons for this phenomenon. If the flow is high and low during use, it is mainly because the resistance in the pipe network is high and low, or the fan works in the flying area; If the flow gradually decreases in a long period of time or suddenly decreases in a short period of time during use, this is mainly due to the blockage of the pipe network.
1. Cause: The transmission belt is loose, and the rotating speed decreases, or the rotating speed of the prime mover decreases; Solution: adjust or replace the drive belt, find out the reason for the decrease of the prime mover speed and eliminate it.
2. Air leakage of pipe flange; Treatment: Replace the flange gasket.
3. Cause: air leakage of shaft seal device; Treatment method: repair the shaft seal device.
4. Cause: air leakage of safety valve; Treatment method: grind or replace the sealing ring.
5. Cause: the clearance of each part of the rotor is greater than the specified technical requirements; Treatment method: adjust the clearance of each part.
6. Cause: the inlet gas filter is blocked; Treatment method: clean the gas filter.
7. Cause: The gas temperature at the suction inlet of any section of the fan is too high; Treatment method: adjust the cooling water volume, and clean the cooler if necessary.
8. Cause: excessive seal clearance; Treatment method: adjust the clearance.
I believe that after reading the above contents, you should also understand the solution to the insufficient flow when Roots blower is running. I hope it will be helpful to you.
Text term label: Roots blower
Link to this article: //wuhanzhcs.com/html/news/n02/737.html
