What kind of pump is generally used for the lubricating oil pump in the forced lubrication system of large centrifugal pump motors?
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A few days ago, an instrument gauge was damaged during a test run following the centrifugal pump startup procedure; later, the maintenance team also attempted to run the pump according to the relevant procedures (as it’s a new factory, they might not be familiar with the type of pump), and another gauge was damaged... Are oil pumps generally positive-displacement pumps?
It is usually a screw pump or a gear pump.
They are generally positive displacement pumps. There are gear pumps, (internal meshing, external meshing) rotor pumps, screw pumps, and so on.
Gear pumps are generally used; screw pumps are employed when a high oil pressure is required
Ours is a screw pump; however, generally, screw pumps and gear pumps are used
They are generally positive-displacement pumps, with gear pumps being the most commonly used.
Got it. I’ve already obtained the relevant information from the engineer; it’s indeed a positive displacement pump, a gear pump. Thank you. One more question: what is the typical pressure control for this lubrication system?
Hey guy upstairs, the oil pressure of our compressor is 0.4 MPa
But ours is just a high-power motor with a 29xx rotor...
For screw pumps, all the centrifuges in our factory use screw pumps
It is usually a positive-displacement pump; since large centrifugal pumps are equivalent to small power units that require reliable operation and stable output pressure, choosing a rotary positive-displacement pump is a good option. Gear pumps are generally used in smaller power units, while screw pumps are used in larger ones.
But what’s unclear is why volume pumps are used everywhere – is it just to meet the pressure requirements?
The reason why you damaged the pump pressure gauge is probably because you didn’t follow the pump’s operating procedures. A positive displacement pump must have its outlet and backflow path in place before it can be started; otherwise, the pressure gauge will get damaged. But what happened to your safety valve? The outlet valve probably isn’t open; generally, gear pumps and screw pumps are used.
Use a screw pump or a gear pump. The output of these two types of pumps is relatively stable, with little fluctuation.
Our company uses screw pumps, with a dual-pump configuration.
It is usually a screw pump or a gear pump.
We are all gear pumps. We are all gear pumps
Today, the trial operation was finally successful. Thank you all. We kept the pressure at 0.2 MPa; it’s not the lubrication system of the compressor unit
The pressure in the lubrication system is generally between 0.3 and 0.5 MPa