Three conditions that cause the rotor misalignment of the horizontal stainless steel centrifugal pump
Rotor misalignment is one of the common faults in horizontal stainless steel centrifugal pumps. The horizontal stainless steel centrifugal pump and the motor rotor are connected through a coupling. Due to substandard installation, bending of the rotor, offset or deflection of the bearing centerline, The gap between the bearing and the rotor and the deformation of the rotor and the bearing after bearing the load cause the center line of the water pump shaft and the center line of the motor shaft to be not in the same straight line, so that the center axis of the water pump and the center axis of the motor form a fixed angle. Misalignment can cause vibration and cause mechanical failure. The rotor misalignment of horizontal stainless steel centrifugal pump can be divided into the following three conditions.
The first type is parallel misalignment. There is a corresponding radial displacement between the axis of the rotor. When the rotor rotates once, the radial elastic force will change the direction 4 times, that is, vibrate 2 times. Therefore, the vibration frequency is twice the fundamental frequency. vibration.
The second type is misalignment. The angular velocity of the motor rotor and the water pump rotor are different, and the coupling in the middle is likely to produce a bending moment. The function of the bending moment is to minimize the deflection angle between the motor shaft and the water pump shaft. Every time the shaft rotates once, the direction of the bending moment changes. Therefore, the angle misalignment increases the axial force of the rotor, which causes the rotor to vibrate in the axial direction.
The third type is the misalignment of parallel deflection. There is not only a radial displacement between the rotor axes, but also an angular displacement, so that the rotor produces both radial vibration and axial vibration.
