Patent ID: 7854601
Filing Date: 2010-12-21
Classification: F04C

Abstract:
1. A lubricant-tight vane rotary vacuum pump, comprising at least one pump stage ( 17 , 18 ) having a pump stage housing ( 10 , 40 ), a safety valve ( 3 ) for controlling gas flow to the pump stage housing; a lubricant pump having an inlet ( 21 ) and an outlet ( 22 ); a lubricant reservoir ( 30 ) at least partially surrounding the pump stage housing ( 10 , 40 ); a hydraulic conduit ( 31 ) connecting the lubricant pump outlet ( 22 ) with the safety valve ( 3 ), with a pressurized lubricant flow through the hydraulic conduit ( 31 ) opening the safety valve ( 3 ); a channel ( 32 ) branching from the hydraulic conduit ( 31 ) for delivering a pressurized lubricant into the lubricant reservoir ( 30 ); a motor ( 7 , 8 ); and a shaft ( 15 ) extending through the motor and the at least one pump stage ( 17 , 18 ), wherein the lubricant pump is arranged on the shaft ( 15 ) between the motor and the at least one stage, and wherein the vane rotary vacuum pump has an adjusting surface ( 9 ), and the lubricant pump outlet ( 22 ) is located on a side of the shaft ( 15 ) adjacent to the adjusting surface ( 9 ).