When Roots blower operates under rated conditions, the surface temperature of each rolling bearing is usually not more than 95 ° C, the temperature of 90% lubricating oil in the oil tank is not more than 65 ° C, and the large diameter of the vibration speed bearing is not more than 6.3mm/s. During the operation of the fan, always pay attention to the condition and oil quantity of the lubricant.
Generally, it is very normal if the load is rated, and it is completely abnormal if the load is overloaded. For example, in the normal operation of Roots blower, the inlet and outlet valves cannot be completely closed, let alone the overload operation, which is even more inaccurate. Some factories use blowers. If the blowers are used, it is better not to stop suddenly at full load, but to stop after unloading gradually, which can avoid damage to the machine. Due to its characteristics, the gas at the exhaust port is not allowed to return to the air inlet for a long time, which has an impact on the safety of machine oil. In this case, cooling measures should be taken.
The adjustment shall be carried out slowly, and the load shall be adjusted slowly to guide the rated power. It is not allowed to adjust to rated load at one time. Rated load refers to the static pressure difference between air inlet and air outlet. When the exhaust pressure is normal, please pay attention to the pressure change at the inlet to avoid overload. During the normal operation of the fan, please do not completely close the air inlet and exhaust valves, and do not allow overload operation. If you want to stop the operation of Roots blower, do not stop the operation at full load, and gradually stop the load before stopping to avoid damage to the machine.
1. Resistance increase caused by bearing oil shortage
If the fan is original, the motor bearing is lack of oil or the bearing at the bearing seat is lack of oil, which will increase the resistance of the motor, and the motor current exceeds the allowable value or directly burns the motor winding (if there is an air switch that can play a protective role, the air switch will trip).
2. The air volume and air pressure change significantly, and the fan is overloaded
In addition to the mechanical reason, it is mainly the system reason. Generally, the fan designed by the fan manufacturer will leave a certain design margin. As for the motor with water inflow, the motor current will be high at that time, but it is not overload. The real overload occurs in the increase of air volume and the change of air pressure, This is also a common cause of high fan current.
3. Causes of fan design factors
The poor design of Roots blower leads to poor balance of fan impeller, and related faults occur during rotation, such as bearing damage, sudden increase of load, poor balance (misalignment and misalignment during installation), etc., which causes the motor to be in overpressure and overcurrent.
4. Overflow caused by human error
There are two human reasons. One is that the motor is small; The valves of the fan were not fully opened, resulting in the loss of Roots blower overflow.
I believe that after reading the above content, you should also understand the direct cause of the current overload of Roots blower. I hope it will help you.
Text label: Roots blower
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