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A china dry screw vacuum pump is a device that generates, improves and maintains vacuum in a closed space by various methods. A vacuum pump can be defined as a device or device that uses mechanical, physical, chemical or physicochemical methods to extract gas from a vessel to obtain a vacuum. With the development of vacuum applications, many kinds of vacuum pumps have been developed, and their pumping speed has ranged from a few tenths of a liter per second to hundreds of thousands and millions of liters per second. The ultimate pressure (ultimate vacuum) ranges from coarse vacuum to extremely high vacuum above 10-12Pa.

Screw vacuum pump is a kind of equipment that uses a bunch of screws to produce suction at high speed to achieve exhaust effect, which can effectively eliminate water vapor and dust, and has important applications in medicine, chemical industry and other fields.