Problems with compressor impellers
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Why does the size of the impeller in our factory’s compressors decrease sequentially from the non-drive end to the drive end (as part of the diffuser section), but then increase again near the coupling? Why is that? Logically, shouldn’t higher pressure result in a smaller impeller?
The original poster can check carefully: are there any other air inlets at the end stage?
Perhaps the last stage has axial intake, or your rotor is segmented.
If it’s just one paragraph, it seems that the last one is for balancing the axial force. Which factory’s compressor is it? Are there any photos?
High pressure and narrow flow channels, not a small impeller.
The original poster cannot discuss the impeller in isolation; you need to provide information on your manufacturing process. Is it just the increase in impeller diameter? Has the impeller flow channel widened? If the diameter of the impeller increases while the flow channel narrows, it is possible that recycled gas from subsequent processes accumulates at the inlet of this stage of the impeller; generally, the volume of gas in this portion is much larger than that of the fresh gas entering at the front. Additionally, regarding the design of the impellers, in a typical air compressor, the upstream section may use an axial-flow impeller while the downstream section uses a centrifugal impeller, and obviously, axial-flow impellers are much larger in size. For the OP’s situation, I can only guess and answer; please don’t take it personally.
Please describe in more detail: how many stages does this compressor have, and what is its model?