Schematic diagram of centrifugal pump
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The figure shows an assembly diagram of an AY centrifugal pump. There are several questions regarding this diagram, and I hope to get answers to them. 1. Is the area circled in red in the diagram the outlet of the first-stage impeller discharge chamber? If so, why is the cross-section approximately rectangular rather than circular? 2. The first-stage suction chamber of this pump is of the semi-spiral type; what type is the second-stage suction chamber? It appears to be an annular suction chamber from the diagram – is that correct? 3. Does this pump belong to the type in which adjacent vortex chambers rotate 180 degrees to balance radial forces?
The structure is similar to this one, but why is the outlet rectangular?
It’s clearly the assembly diagram of a Y-type oil pump
There are many types of cross-sections for vortex chambers, and the shape of the cross-section has little impact on efficiency.
I roughly understand this structure now; thank you, teacher
The primary suction chamber of this pump is semi-spiral-shaped, while the secondary suction chamber is an annular suction chamber
This pump belongs to the type in which adjacent chambers rotate 180 degrees to balance radial forces
I see. Let me ask another question: when checking the pump shaft, the stress points of the two bearings on the left side are different, while there is one bearing on the right side. In total, there are three bearings, meaning three support points. From the perspective of material mechanics, this constitutes a superstatic structure. Ignoring the weight of the structure, the forces acting on it are as shown in the diagram. Since the impeller ensures radial force balance, only one couple remains. A couple can only be balanced by another couple. Therefore, one of the three bearings experiences no stress. I’m not sure where the error in the analysis lies. May I ask the teacher how such a structure’s shaft is checked?
This post was last edited by backcat666 on 2018-6-1 05:05. The reverse arrangement of the two impeller inlets balances most of the axial force, thereby reducing the axial load on the pair of diagonal contact bearings! The pump shaft features a design with dual supports: it is fixed in both directions at one end, while the other end is free to move ； A diagonal contact bearing can only be considered as one support point!
That sounds really complicated. What does axis verification mean? As I understand it, a diagonal contact bearing is used to balance axial forces; we call this the fixed end. Cylindrical rollers are not subjected to axial forces; we call this the floating end. As for the radial force, it’s normal