| 摘要 |
<p>A molecular vacuum pump comprises a hollow stator (1) in the axial opening (2) of which is mounted a rotor (3). The internal surface (4) of the stator (1) is provided with grooves (5) oriented along a helicoidal line and forming, together with the external surface (6) of the rotor (3) facing the stator (1), channels for pumping out the gas. A part of the axial opening (2) of the stator (1) widens in the direction of its butt end (7) facing the suction side, whereas the external surface (6) of the rotor (3) is provided with ribs (13) constituting a multiple-thread screw. Each rib (13) widens in the direction of the butt-end (7) of the stator (1) facing the suction side so that the gap between its edge (15) facing the internal surface (4) of the stator (1) and said surface (4) is constant along the length of the edge (15). The inlet openings (9) of the suction channels are located on the internal surface of the stator (1) in the wide part of its axial opening (2).</p> |
