Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1995-04-21
1996-09-10
Cummings, Scott W.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 59, 277 65, 277 67, F16J 1534
Patent
active
055538673
ABSTRACT:
A chemical processing centrifugal pump is provided with a triple cartridge seal arrangement including a single inboard seal and a pair of concentric seals located rearward (i.e. outboard) of the inboard seal, the concentric seals being closest to the pump bearings for stability against vibration purposes. The passageway along the pump shaft between the inboard seal and the radially inwardmost concentric seal is filled with a pressurized barrier inert gas so as to create a gas seal while a barrier chamber defined between the concentric seals is filled with a pressurized barrier liquid. Accordingly, the concentric seals are lubricated by the barrier liquid disposed in the barrier chamber while the inboard seal is lubricated by the fluid being pumped. Optionally, the inboard seal may be lubricated by barrier liquid if such a pressurized liquid is used instead of the inert gas to fill the passageway.
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Cummings Scott W.
Environamics Corporation
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