Vacuum Pump

Abstract

A vacuum pump, particularly a Roots pump, claw pump, or screw pump. The vacuum pump has at least one rotor as a pumping device, which rotor is disposed on a shaft. The vacuum pump has at least one bearing and/or drive region for the shaft and at least one suction chamber. During a pumping process, a medium is conveyed from an inlet of the suction chamber to an outlet of the suction chamber, by means of rotation of the rotor. At least one gas conveying device is configured for conveying the medium away from the bearing and/or drive region in the direction toward the rotor and/or toward the outlet of the suction chamber.

1 . A vacuum pump comprising:
 at least one shaft that has a rotor as a pumping device;   at least one of a bearing and a drive region for the shaft;   at least one suction chamber, where a medium is conveyed from an inlet of the suction chamber to an outlet of the suction chamber, during a pumping process, by rotation of the rotor; and   at least one gas conveying device configured for conveying the medium away from at least one of the bearing and drive region, in a direction toward at least one of the rotor and the outlet of the suction chamber.   
     
     
         2 . A vacuum pump according to  claim 1 , wherein the gas conveying device is disposed between at least one of the bearing and drive region for the shaft and the rotor, and wherein the gas conveying device is disposed within a suction chamber housing that delimits the suction chamber. 
     
     
         3 . A vacuum pump according to  claim 1 , wherein the gas conveying device is provided only on the side of the vacuum pump that faces the outlet of the suction chamber, and wherein a flushing gas stream is supplied only on the side of the vacuum pump that faces the inlet of the suction chamber. 
     
     
         4 . A vacuum pump according to  claim 1 , wherein the gas conveying device comprises a fan having at least one fan wheel. 
     
     
         5 . A vacuum pump according to  claim 1 , wherein the gas conveying device is driven by the shaft of the vacuum pump. 
     
     
         6 . A vacuum pump according to  claim 1 , wherein the gas conveying device is mounted on the shaft of the vacuum pump. 
     
     
         7 . A vacuum pump according to  claim 2 , wherein the gas conveying device is disposed between the rotor and an outer wall of the suction chamber housing, and the shaft is passed through the suction chamber housing. 
     
     
         8 . A vacuum pump according to  claim 7 , wherein the suction chamber housing comprises at least one drain slant for a condensate drain, proceeding from a shaft pass-through. 
     
     
         9 . A vacuum pump according to  claim 8 , wherein sides of the gas conveying device that face away from the suction chamber as well as adjacent part of the suction chamber housing are shaped in such a manner that a part close to the shaft, in each instance, lies closer to the suction chamber than a part away from the shaft. 
     
     
         10 . A vacuum pump according to  claim 1 , comprising two shafts, each having at least one rotor, wherein at least one gas conveying device is assigned to each shaft. 
     
     
         11 . A vacuum pump according to  claim 10 , wherein the gas conveying devices work together for synchronization of the shafts, as synchronous gear mechanisms. 
     
     
         12 . A vacuum pump according to  claim 10 , comprising two shafts having rotors that can be rotated in opposite directions, synchronous to one another, and a two-shaft synchronous motor configured for magnetic drive and for magnetic synchronization of the shafts. 
     
     
         13 . A vacuum pump according to  claim 12 , wherein the two-shaft synchronous motor and bearing parts for shaft mounting of the two shafts are disposed in a common bearing and drive region. 
     
     
         14 . A vacuum pump according to  claim 1 , wherein a suction line that empties into the inlet of the suction chamber is provided with at least one of a suction valve and a flushing gas line connected with the suction line, which is provided with a flushing gas valve. 
     
     
         15 . A vacuum pump according to  claim 14 , comprising a control device controlling the suction valve and flushing gas valve. 
     
     
         16 . A vacuum pump according to  claim 15 , wherein the control device is coupled with a further control device for the drive unit of the shafts. 
     
     
         17 . A vacuum pump according to  claim 1 , wherein the vacuum pump is at least one of a Roots pump, a claw pump, and a screw pump. 
     
     
         18 . A vacuum pump according to  claim 1 , comprising a flushing gas feed. 
     
     
         19 . A vacuum pump according to  claim 18 , wherein the flushing gas feed is provided into at least one of a region between at least one of the bearing and drive region and the suction chamber, and directly into at least one of the bearing and drive region. 
     
     
         20 . A vacuum pump comprising:
 at least one shaft that has a rotor as a pumping device;   at least one of a bearing and drive region for the shaft; and   at least one suction chamber;   wherein a medium is conveyed from an inlet of the suction chamber to an outlet of the suction chamber, during a pumping process, by means of rotation of the rotor; and   wherein at least one of the medium and a flushing gas can be drawn off, by way of an intermediate chamber disposed between at least one of the bearing and drive region and the suction chamber, using a suction device connected with the intermediate chamber.   
     
     
         21 . A vacuum pump according to  claim 20 , comprising two shafts, each having rotors that can be rotated in opposite directions, synchronous to one another, and a two-shaft synchronous motor configured for magnetic drive and for magnetic synchronization of the shafts. 
     
     
         22 . A vacuum pump according to  claim 21 , wherein the two-shaft synchronous motor and bearing parts for shaft mounting of the two shafts are disposed in a common bearing and drive region. 
     
     
         23 . A vacuum pump according to  claim 20 , wherein a suction line that empties into the inlet of the suction chamber is provided with at least one of a suction valve and a flushing gas line connected with the suction line, which is provided with a flushing gas valve. 
     
     
         24 . A vacuum pump according to  claim 23 , comprising a control device controlling the suction valve and flushing gas valve. 
     
     
         25 . A vacuum pump according to  claim 24 , wherein the control device is coupled with a further control device for the drive unit of the shafts. 
     
     
         26 . A vacuum pump according to  claim 20 , wherein the vacuum pump is at least one of a Roots pump, a claw pump, and a screw pump.