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The S-VSI screw vacuum pump (sizes 100 and 300) represents modern, state-of-the-art dry running vacuum technology that is not only extremely energy efficient and reliable but offers a low life cycle costs. It is used in a variety of industrial applications such as drying and packaging.
A screw vacuum pump consists of two parallel, screw-shaped rotors, one with a right-hand thread and the other with a left-hand thread. Both screws turn in the compressor housing without friction and at very tight clearances.
They are synchronized via a precision gear. The compression housing and the special shape of the screws form the compression chambers. Due to the opposite rotation of both screws the chamber connected with the suction port is enlarged and the gas is transported into the compression chamber. Then the chamber moves axially from the suction side to the pressure side (arrow).
In variable pitch models, the gas is compressed at each pitch change and cooled before the next pitch change, resulting in greater efficiency. On the pressure side the chamber is moved against the axial housing wall and the volume is reduced until the front surface of the screw opens the pressure channel and the pre-compressed gas is discharged through the pressure connection. Cooling is achieved using a water cooled outer chamber. For some pump sizes additional cooling gas can be introduced into the pump.
Our S-VSI screw vacuum pumps achieve an ultimate vacuum of 0.08 mbar (abs.) and can operate at any pressure between end vacuum and atmospheric pressure.
