Our screw vacuum pumps are non-contact, dry-type pumps, renowned for their broad suction speed range, simple and compact structure, friction-free gas cavity components, long service life, low energy consumption, and oil-free contamination. Standard vacuum systems fail to meet the demands for clean, oil-free, and corrosion-resistant applications. Many oil-filled vacuum systems have been replaced by oil-free, clean vacuum systems. The dry, oil-free, and environmentally friendly screw vacuum pumps are the updated and improved versions of reciprocating pumps, water ring pumps, sliding vane vacuum pumps, scroll vacuum pumps, and Roots blowers.
The screw vacuum pump consists of a working chamber formed by a pair of parallel helical rotors and the pump housing, with no friction between the rotors and the housing and maintaining a certain gap. The two rotors and the housing create a sealed cavity, and as the rotors rotate, they continuously compress and carry the gas within the sealed cavity to the exhaust port for discharge.
A screw vacuum pump's one stroke is equivalent to a single-stage pump, while a multi-stroke screw vacuum pump is akin to a multi-stage pump in series. Compared to dry vacuum pumps with multi-stage series, such as claw vacuum pumps and multi-stage Roots vacuum pumps, the screw vacuum pump, with no internal passages between stages, directly pushes gas from the suction side to the discharge side. This makes it less prone to clogging when removing condensable gases, dusty, or particulate-laden gases, and easier to clean. The pressure of the inhaled gas is smoothly increased above the pressure at the discharge point. This design ensures that the discharged gas does not contain any oily substances. The motor's power is transmitted to the drive shaft through a coupling device, which then transmits power to the driven shaft via timing gears. Since screw vacuum pumps do not require oil lubrication or water sealing, the pump chamber is completely oil-free.
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