Patent ID: 7264439
Filing Date: 2007-09-04
Classification: F04D

Abstract:
1. A device for the evacuation of a chamber to pressures in the high vacuum range, comprising: an atmospheric pressure side vacuum pump; a mechanical-kinetic vacuum pump with a rotor and a stator, the stator having a rotationally symmetric inner surface, which conforms to an outer geometry of the rotor, the rotor of the mechanical-kinetic vacuum pump having a structure for effecting gas conveyance from a suction side to a pressure side connected to the pressure side vacuum pump; the structure for effecting the gas conveyance includes webs whose pitch and width decrease from the suction side to the pressure side, an outer diameter of the rotor and an inner diameter of the stator of the mechanical-kinetic vacuum pump decrease from the suction side to the pressure side, the rotor including a hub, said hub carrying the webs and being formed conically in such a manner that its diameter increases from the suction side to the pressure side.