Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed
AssigneeLeybold Aktiengesellschaft
InventorsHanns-Peter Berges, Hartmut Kriehn, Wolfgang Leier, Ralf Steffens
Life of this patent
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Abstract
A twin-shaft vacuum pump having a pair of shafts, at least one pump chamber, a pair of rotors disposed in the or in each pump chamber and mounted on the shafts, and housing members defining the pump chamber or chambers, a synchronization mechanism composed of two gears disposed in a side chamber, a drive motor, and a transmission mechanism connecting the drive motor to one of the shafts. In order to simplify installation and servicing of the pump, the shafts are mounted vertically. The side chamber, synchronization mechanism, and transmission mechanism are disposed below the lower rotor pair.
Claims19
A twin-shaft vacuum pump having a pump inlet and a pump outlet, comprising:
- housing means for defining a pump chamber and a further chamber beneath the pump chamber, the pump inlet being disposed above the pump chamber and the pump outlet being disposed below the pump chamber, the housing means including an oil container disposed below the pump chamber, the further chamber extending into the oil container;
- a horizontal connecting flange attached to the housing means, the horizontal connecting flange having an opening which provides the pump inlet;
- a pair of pump shafts;
- shaft mounting means for rotatably mounting the pump shafts so that the pump shafts are vertically disposed and extend into the pump chamber and into the further chamber;
- a pair of claw-type Northey rotors in the pump chamber, each rotor being connected to a respective pump shaft;
- a drive motor having a vertically disposed motor shaft;
- power transmission means for connecting the motor shaft to one of the pump shafts, the power transmission means being disposed below the pump chamber;
- synchronization means in the further chamber for synchronizing the rotation of the pump shafts, the synchronization means including two synchronization gears which are disposed below the pump chamber;
- and
- an oil pump projecting into the oil container, the oil pump being disposed at the lower end of one of the pump shafts.
The pump of claim 17, further comprising a continuous cooling system for circulating water to cool the motor and housing means.
A twin-shaft vacuum pump having a pump inlet and a pump outlet, comprising:
- housing means for defining a plurality of pump chambers disposed one above another, and a further chamber beneath the lowermost pump chamber, the pump inlet being disposed higher than the uppermost pump chamber and the pump outlet being disposed lower than the lowermost pump chamber, each pump chamber having a horizontally disposed lower floor with an outlet opening therein, the outlet opening in the lower floor of the lowermost pump chamber communicating with the pump outlet;
- a pair of pump shafts;
- shaft mounting means for rotatably mounting the pump shafts so that the pump shafts are vertically disposed and extend into the pump chambers and into the further chamber;
- a plurality of pairs of rotors, each pair of rotors being disposed in a respective pump chamber and being attached to the shafts;
- a drive motor having a motor shaft;
- power transmission means for connecting the motor shaft to one of the pump shafts, the power transmission means being disposed below the pump chambers;
- and
- synchronization means in the further chamber for synchronizing the rotation of the pump shafts, the synchronization means including two synchronization gears which are disposed below the pump chambers.
Dependencies are inferred from the claim text.