Machine with a rotatable rotor

Abstract

A machine ( 1 ) has a rotor ( 3 ) located so that it can rotate in a housing ( 2 ). The rotor is located at least partly in fluid, such as coolant. To provide a machine which has lower losses with a higher cooling capacity, the housing pressure can be reduced so that the fluid transitions into the two-phase range. In one embodiment, the housing pressure can be reduced by a suction device ( 7 ).

1 . A machine, comprising: 
 a rotor located in a housing, wherein the rotor is located at least partly in fluid; and    a device for reducing a housing pressure such that the fluid transitions into a two-phase range.    
     
     
         2 . The machine as claimed in  claim 1 , wherein the device for reducing housing pressure comprises a suction device.  
     
     
         3 . The machine as claimed in  claim 2 , wherein an outlet line that is in communication with the housing is connected with a suction line of the suction device.  
     
     
         4 . The machine as claimed in  claim 2 , wherein a pressure side of the suction device is in communication with a reservoir.  
     
     
         5 . The machine as claimed in  claim 2 , wherein a pressure side of the suction device is in the form of a delivery line.  
     
     
         6 . The machine as claimed in  claim 3 , further comprising a stop valve that opens in a delivery direction and is located in the outlet line downstream of the suction device.  
     
     
         7 . The machine as claimed in  claim 3 , further comprising a bypass line that is in communication with the outlet line and bypasses the suction device.  
     
     
         8 . The machine as claimed in  claim 2 , wherein the suction device comprises a pump.  
     
     
         9 . The machine as claimed in  claim 8 , wherein the suction device further comprises a vacuum limiting device.  
     
     
         10 . The machine as claimed in  claim 9 , wherein the vacuum limiting device comprises a vacuum choke that is associated with the pump.  
     
     
         11 . The machine as claimed in  claim 10 , wherein the vacuum choke is in the form of a control valve which is associated with a suction side of the pump and can be pushed by a spring toward a closed position and pushed by the housing pressure toward an open position.  
     
     
         12 . The machine as claimed in  claim 9 , wherein the vacuum limiting device comprises a pressure compensator that is associated with the pump.  
     
     
         13 . The machine as claimed in  claim 12 , wherein the pressure compensator is in the form of a control valve which is located in a pump bypass line and is pushed toward an open position by a spring and toward a closed position by the housing pressure.  
     
     
         14 . The machine as claimed in  claim 2 , wherein the suction device is in a drive connection with the machine.  
     
     
         15 . The machine as claimed in  claim 2 , further comprising a drive motor to drive the suction device, wherein the drive motor is selected from the group consisting of an electric motor, a hydraulic motor, or an internal combustion motor.  
     
     
         16 . The machine as claimed in  claim 2 , wherein the machine is used in a drive system with a booster pump, and wherein the booster pump is in the form of a pump of the suction device.  
     
     
         17 . The machine as claimed in  claim 16 , wherein the pump is in communication by a suction line with a reservoir.  
     
     
         18 . The machine as claimed in  claim 1 , wherein the machine is an electrical machine.  
     
     
         19 . The machine as claimed in  claim 1 , wherein the machine is a hydraulic machine.