Patent ID: 6019585
Filing Date: 2000-02-01
Classification: F01C,F04C

Abstract:
An oil sealed vane type vacuum pump having a rotor assembly rotatably mounted within a stationary casing, said rotor assembly including an anchor section mounted within a suction chamber provided within said casing and a bearing section mounted within a bore provided in said casing, said anchor section having a pair of opposed vanes slidably mounted within a slot so that the opposing ends of the vanes are separated by a space within the slot that increases and decreases in volume as the rotor turns and an oil pump for supplying oil to the space between the vanes, said vacuum pump further includingan oil channel in said casing for delivering oil from the oil pump into the bearing section of the rotor assembly,said bearing section containing a radially extended oil hole that periodically opens into said oil channel as the rotor assembly turns to admit oil into the bearing section,an opening in said oil hole that is in fluid flow communication with the space between the vanes,said oil channel being located in the casing with respect to the rotor assembly such that oil is admitted into the space between the vanes only when the volume in the space is increasing, andlinking means leading from the space between the vanes into the suction chamber, said linking means being always open whereby oil in the space between the vanes is not pressurized as the rotor assembly turns.