Screw-type vacuum pump has shaft-mounted rotors each with central hollow chamber in which are located built-in components rotating with rotor and forming relatively narrow annular gap through which flows cooling medium

摘要

The screw-type vacuum pump has shafts(7,8) carrying rotors(3,4) each with a central hollow chamber(31) in which are located built-in components rotating with the rotor and forming a relatively narrow annular gap section(32) through which flows cooling medium. The respective annular gap extends between the built-in components and associated inner wall of the rotor chamber, and between the suction side and pressure side of the rotor. The annular gap is supplied with cooling medium through feed and return lines in the shafts.