Roots blower and motor are connected by coupling to transmit motion and torque. Misalignment is the most common fault of Roots blower, and 60% of the fan faults are related to misalignment. The misalignment fault of fan refers to the inclination or deviation degree between the axis lines of two rotors of fan and motor and the bearing center line.
Main reasons for misalignment of Roots blower rotor system:
1. The bearing clearance is too large or the ball has pitting corrosion, which is generally caused by insufficient lubrication or poor oil quality. This condition is likely to cause misalignment and vibration, and the bearing should be replaced as appropriate.
2. The bearing pedestal vibrates for a long time, causing deviation. As the vibration of large Roots blower is inevitable, it is easy to cause slight loosening of the fastening bolts of the base, which will lead to misalignment and vibration.
3. It is caused by the main motor itself. Large motors have high requirements for dynamic balance itself. Due to various reasons, the dynamic balance of the motor itself is damaged and the requirements are misaligned. Summary: After the misalignment fault of Roots blower rotor system occurs, a series of dynamic effects will be produced during the rotation process, which will be adverse to the equipment operation, causing the deflection of the coupling, wear of the bearing, oil film stability, shaft deflection and deformation, etc., so that the force on the rotor and the additional force on the bearing will lead to abnormal vibration of Roots blower and early damage of the bearing, which is extremely harmful. At present, we generally adopt the original method to deal with the misalignment fault of the fan.
First, level the main shaft of Roots blower, and rotate the impeller to ensure that the levelness deviation of the main shaft of the blower at each point is within the range; Then find the alignment of the fan and motor coupling. Generally, use a dial indicator to detect the runout at four points to ensure that the runout at four points is within the technical range, so that the alignment is basically found. It can also be solved by laser alignment instrument, which is convenient and fast.
1. The bearing clearance is too large or the ball has pitting corrosion, which is generally caused by insufficient lubrication or poor oil quality. This condition is likely to cause misalignment and vibration, and the bearing should be replaced as appropriate.
2. The bearing pedestal vibrates for a long time, causing deviation. As the vibration of large Roots blower is inevitable, it is easy to cause slight loosening of the fastening bolts of the base, which will lead to misalignment and vibration.
3. It is caused by the main motor itself. Large motors have high requirements for dynamic balance itself. Due to various reasons, the dynamic balance of the motor itself is damaged and the requirements are misaligned.
After the rotor system of Roots blower suffers from misalignment fault, a series of dynamic effects will be produced during the rotation process, which will be detrimental to the operation of the equipment, causing deflection of the coupling, wear of the bearing, steady oil film, deflection and deformation of the shaft, etc. The force on the rotor and the additional force on the bearing will lead to abnormal vibration of Roots blower and early damage of the bearing, which will do great harm.
At present, we generally adopt the original method to deal with the misalignment fault of the fan. First, level the main shaft of Roots blower, and rotate the impeller to ensure that the levelness deviation of the main shaft of the blower at each point is within the range; Then find the alignment of the fan and motor coupling. Generally, use a dial indicator to detect the runout at four points to ensure that the runout at four points is within the technical range, so that the alignment is basically found.
I believe that after reading the above contents, you should also understand the handling method of Roots blower motor coupling. I hope it will be helpful to you.
Text label: Roots blower
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