Seeking advice on hot water circulation pump issues:
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This post was last edited by “I reflect on myself three times a day” on 2023-12-29 at 09:00. 3379302: 1. Is the pump cover damage caused by cavitation? 2. Why are the bearing at the positioning end installed in a series configuration?
1. Is the pump cover damaged due to cavitation? There are signs of cavitation, but it appears that most of them are due to wear and erosion ； 2. Why are the bearing at the positioning end installed in a series configuration? According to the assembly diagram, the bearings at the positioning end are series angular contact ball bearings; this arrangement is suitable for scenarios where the axial load is unidirectional.
Is the axial force of this pump in the opposite direction?
What does that mean? Based on the assembly diagram, the axial force of this pump is clearly directed toward the atmospheric side at the positioning end.
It is recommended that the images of the equipment at the site show the general shape of the equipment, as well as the areas that are damaged. Such images are like a narrow perspective; it’s difficult to gain a comprehensive view. The equipment is mostly already finalized, so there’s no need to worry about the structural issues of the original design. It is speculated that it might be a problem related to the manufacturing process, such as the phenomenon of \"cavitation,\" which is a common issue with hot water pumps. For reference.
Impeller wear and axial movement cause stress on the static ring, leading to cracks
Since the pressure at the hot water inlet is estimated to be high, and the pump shaft diameter can be seen from the diagram, a series arrangement of angular contact ball bearings is used; these bearings are designed to bear only the axial forces directed toward the coupling；