Oil-free screw pump
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What are the differences compared to oil screw pumps? :
Are screw pumps also divided into those with oil and those without oil? You mean a screw compressor, right?
He must be referring to a screw vacuum pump; a dry screw pump is completely dry and oil-free.
Oil-free versions are suitable for applications with high requirements regarding gas oil content; the gap between the male and female rotors is larger in such cases, which results in lower efficiency. Foreign brands generally have higher requirements regarding materials and gaps ； The oil-powered (fuel-injected) version has two-stage filters, and domestic brands have passed the quality checks.
Vacuum pumps that can operate in a pressure range from atmospheric pressure to 10-2 Pa； In the suction flow channel of the pump, no oils or sealing fluids may be used. A pump whose exhaust port is connected to the atmosphere and can continuously discharge gas into it is called a dry vacuum pump. Models with oil have a higher pumping volume than those without oil, and their ultimate vacuum is lower than that of oil-free models. Those with oil are suitable for evacuating air, but not for removing water vapor or other media that react with oil