What are the disadvantages of pumping air with a centrifugal pump?

This post was last edited by CHANGBAISHI on 2020-11-26 at 15:57, which can lead to idling operation without any cooling of the medium; in particular, the dynamic seals will be damaged, and in severe cases, the bearings and spindle may also be ruined. Also, centrifugal pumps can be for gases or liquids; \"evacuation\" can cause changes in axial force, which in turn can lead to damage to the pump bearings.

During idling, if it is a magnetic pump, the loss of heat transfer between the inner and outer magnets leads to a rapid increase in temperature; first, the inner and outer magnets burn out, followed by damage to the isolation sleeve. Then, the sliding elements and thrust bearings lose their lubrication, resulting in dry friction, which destroys the graphite or silicon nitride components. In the end, basically only the motor of the pump remains usable. In ordinary chemical pumps, once they are evacuated, vibration and noise levels start to rise sharply; the impeller and shaft begin to vibrate. But what gets damaged first in such situations is the mechanical seal, as it loses its lubrication, and that’s the end of it. If it keeps running, the shaft will definitely be damaged, and eventually the rolling bearings will also get damaged. That’s roughly the process.

Severe vibration damages the seals; the axial force balance in multi-stage pumps is disrupted, which damages the bearings; friction occurs between rotating and stationary components

Excessive vibration causes negative pressure to be generated in the pipeline, leading to suction issues； The pump body temperature is too high, damaging the bearings.