What is the standard for the shaft play of centrifugal pumps?
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The shaft is constrained by the bearings, so the movement of the bearings is equivalent to the movement of the shaft. For rolling bearings, the bearing clearance that bears the pump’s axial force determines the shaft’s drift and position. For sliding bearings, the translation amount of the thrust bearing (or thrust plate) is the translation amount of the shaft. For pumps with balance discs that automatically compensate for axial forces, the distance between the maximum open position and the closed position of the balance disc is the shaft’s runout. In any case, the magnitude of the relative momentum of all rotors must not cause abnormal collisions or unstructured contact friction within the pump components during rotation.
It depends on the specific pump type. Without considering the need to adjust the axial position of open impeller pumps or deep well pumps with long shafts, the axial movement of other pumps is determined by the clearance value of the bearings or the gap value of the sliding bearings. The clearance of rolling bearings is very small; that of sliding bearings generally does not exceed 1 millimeter.
The axial movement of a standard single-stage centrifugal pump is essentially the bearing clearance, right? What else can cause axial movement? Is there still clearance between the positioning end bearing and the bearing cover, or is the bearing damaged? You mean a multi-stage centrifugal pump with a balance device, right? For multi-stage centrifugal pumps, it’s necessary to know how many stages there are in order to estimate the approximate total head range.:)
Serial momentum is the amount of thermal expansion that needs to be reserved; it is based on this principle!
Those upstairs have provided very detailed explanations, but their views lean more towards those from the third floor, as the answers given are concise and precise – likely the result of years of experience in managing field equipment! Submersible pumps require adjustment of their axial position, with a clearance of around 1.2 mm; the axial movement of other pumps is determined by the clearance value of the bearings or that of the sliding bearings. The clearance in rolling bearings is very small; in sliding bearings, it generally does not exceed 1 mm. It is also important to use appropriate shims with the positioning bearings and bearing caps, with the specific requirements determined by the actual conditions on site.