Compressor
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Why are gear pumps or rotor pumps generally used as the oil supply pumps in compressor lubrication systems? Can’t a centrifugal pump be used? Why are gear pumps or rotor pumps generally used as the oil supply pumps in compressor lubrication systems? Can’t a centrifugal pump be used?
Gear pumps or rotor pumps belong to the volume-type pumps; they provide a stable and continuous oil flow, and enable forced oil supply for lubrication, thus maintaining a certain oil pressure. Lubrication is crucial in large-scale machinery, and the oil supply system must operate continuously and stably; therefore, gear pumps or screw pumps are generally chosen for this purpose. Centrifugal pumps are speed-type pumps; an increase in the back pressure at the outlet affects the pump’s flow rate. Moreover, centrifugal pumps are prone to abnormal operating conditions such as cavitation and gas entrapment. They also have many components, and parts like the impeller, mouth ring, and mechanical seal are prone to damage. Compared to gear pumps, their operating conditions are less stable.
Is a rotary pump the same as a screw pump?
Gear pumps or rotor pumps belong to the category of positive displacement pumps; they provide a stable and continuous flow rate, are less prone to gas entrainment and cavitation, have strong pumping capacity, and maintain stable suction. In the event of internal leakage, the pressure within the chamber remains high, allowing gear pumps or rotor pumps to withstand certain levels of output resistance.
Positive displacement pumps such as gear pumps, rotor pumps, and screw pumps are used to transport lubricating oil; they offer stable flow and pressure, reliable performance, and low pulsation. Gear pumps and screw pumps have a long service life when used for transporting lubricating oil, and they are not prone to damage