Dynamic balancing problem of the rotor in a double-support single-stage centrifugal pump
Thread Content
One of the oil pumps in our unit is model 250AYII-150; its rotor features a single-stage, double-support design. Due to the severe erosion caused by the medium, the higher-level authorities often require us to perform dynamic balance adjustments during maintenance. We have two dynamic balance machines, both of which are from Shanghai Schenck. I would like to ask the experts in this field: when performing dynamic balancing of this rotor, should the two weight-removal planes be located on the front and rear covers of the impeller, or should one be placed on the impeller cover and the other on the opposite wheel? Or please suggest some other correction plane; I would appreciate your advice. Thank you! This post was last edited by wxhcs on 2009-2-5 09:32.]
Generally, the weight is added at an appropriate position on the back blade of the impeller
For this single-stage pump, the front and rear cover plates of the impeller are designed to be weight-reduced; is the distance between these two weight-reduction surfaces too small? I tried it too, but the results didn’t seem very good; the weight reduction was significant, and the phase angle was often 180 degrees out of sync.
Generally, the front and rear cover plates of the impeller are chosen as the two weight-reducing surfaces.
I really don’t know what the rotor radius and thickness of this pump are, nor how long its shaft is. If the rotor isn’t too thick, choose a planar method for adding or removing weight – do people usually opt for weight reduction on pumps? ）That’s enough. As for the amount of weight added or removed, it is inversely proportional to the radius of the selected position; it is also directly proportional to the magnitude of the imbalance, which remains constant during a given balancing process.
The length of the pump shaft is approximately 1500 millimeters, the outer diameter of the impeller is 350 millimeters, and the thickness of the impeller is about 250 millimeters.
Under normal circumstances, when the rotor thickness is less than the rotor radius, one-sided balancing is sufficient.