Impeller clearance issues in vertical multi-stage pumps
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I would like to ask: for the LDB (A)X8 vertical multi-stage impeller pump, which is used to transport liquid ammonia at a temperature of -33 degrees, what should be the clearance between the impeller and the mouth ring? I currently have 50, but the mouth ring crashes while it’s running. I want to increase it to 70–80; will that have an impact on the throughput?
50 pieces is already a significant number; they should be able to hold tightly together. You need to check the material of the shaft as well as whether it is bent. Or, even if there is enough clearance, the center of the rotor may not be properly aligned – 10 pieces on one side and 40 on the other side – yet they still need to hold tightly together. The issue of them not holding tightly together isn’t necessarily due to a small gap in the ring. 1# nuanqiguanzi
The vibration value for axis 2# lovestory is 4 units, and the verticality has also been checked – everything is fine. It’s impossible for there to be any contraction at low temperatures
You can check for shaft bending on a lathe