Sealing system for a vertically disposed shaft
AssigneeLeybold Aktiengesellschaft
InventorHeinz K. Muller
Life of this patent
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Abstract
A sealing system for an essentially vertical shaft includes an active sealing element disposed between a first structural part rotating with the shaft and a second structural part stationary on a housing. A wall of the housing separates an upper oil-free volume from a lower volume containing oil. The oil flows through the sealing system through a gap formed by the first structural part and a third structural part stationary on the housing. The active sealing element is preferably a threaded shaft seal. In another embodiment, the active sealing element is a combination of a primary contact seal and a threaded shaft seal. The oil flow removes heat generated by the rotating system.
Claims9
A sealing system for use in a vacuum pump equipped with a vertical shaft, said sealing system comprising:
- a stationary housing;
- a vertically disposed shaft mounted for rotation within said housing;
- a seal means connected to said shaft for rotation with the shaft within said housing, said seal means having a top and a bottom surface, said seal means includes a rotating threaded shaft seal having an outer surface, said outer surface adjacent an inner surface of said housing and forming a first space;
- a cylindrical groove within said seal means extending upward from the bottom surface;
- and
- a cylindrical segment disposed within said groove to provide a gap between adjacent surfaces of the groove and the segment which creates a flow path, whereby cooling oil can be conducted through said flow path, said cylindrical segment being connected to said housing.
Dependencies are inferred from the claim text.