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US 6,149,414 AGranted
Oil-sealed vane-type rotary vacuum pump with an oil pump
AssigneeLeybold Vakuum GmbH
InventorsThomas Abelen, Peter Muller
Life of this patent
Estimating the term…
Abstract
The invention concerns an oil-sealed vane-type rotary vacuum pump (1) with a rotor (3) and an oil pump (45, 46) whose suction chamber is fitted with feeds (64, 65) for gas and oil. In order to simplify the supply of a gas/oil mixture to the vacuum pump, the invention proposes that the gas and oil feeds (64, 65) are disposed in such a way that initially only oil and subsequently both oil and air are aspirated into the volume swept by the oil pump (45, 46) as it rotates.
Claims8
An oil sealed vane type rotary pump that includes
- vacuum producing means for drawing air or gas from a container, said vacuum producing means being contained within a casing and further including a drive shaft for rotating said vacuum producing means,
- an oil pump enclosed within said casing, said oil pump further containing a suction chamber and a rotor mounted for rotation within said suction chamber for generating at least one sweep volume within said suction chamber as the rotor turns and a first feed means for delivering oil into said suction chamber and a second feed means for delivering a gas into said suction chamber, and
- said first and second feed means having entry ports to said suction chamber that are spaced apart so that oil is initially drawn into the sweep volume and thereafter both oil and gas are drawn into said sweep volume.
Dependencies are inferred from the claim text.