Multi-stage centrifugal pumps can exhaust air from the pump body, so why can’t single-stage pumps do the same?
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Multi-stage centrifugal pumps can exhaust air from the pump body, so why can’t single-stage pumps do the same? Is it due to the internal mechanism? Our high-pressure nitrogen pump is multi-stage and has exhaust pipes, while the oxygen pump is single-stage; it suffers from cavitation and thus cannot produce sufficient flow
In my opinion, single-stage systems are easier to cool down completely, as there is no need for exhaust pipelines, whereas multi-stage systems are harder to cool down completely; moreover, at the moment of startup, the inlet pressure may be lower than the vaporization pressure. Your oxygen pump is suffering from cavitation; try running the cold pump for a longer period of time and check the insulation condition of the inlet pipelines.
I also agree with the opinion from the second floor – the cryopump needs to be extremely cold; for ordinary oxygen pumps, the temperature usually needs to be below -180 degrees
This post was last edited by mw_mw123 on 2011-4-10 01:26. The two people above are right; check the pipes again to see if there is any pipe stress, whether the inlet pipeline is too long, and if there are too many elbows and valves in the inlet pipeline, etc
A cold pump requires time to ensure proper operation; it can’t be too fast