Face seal having strain induced face geometry

Details Face seal having strain induced face geometry Face seal having strain induced face geometry

1998-11-19

2000-08-29

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277400, E21B 1022

Patent

active

061093769

ABSTRACT:
A mechanical seal for rotary rock bits with a uniquely formed hydrodynamic wave geometry on the sealing faces. The sealing faces are first manufactured flat and smooth, then upon assembly are elastically deformed into a hydrodynamic geometry by an energizing system. After a smooth flat sealing surface is formed, the mechanical seal face elastically deforms into a hydrodynamic wave geometry. The typical deformation has a magnitude greater than about three helium light bands more than the original surface. The region of the sealing surface at the outer periphery of the seal does not have a wave geometry. Rather the portion of the seal face at the periphery is flat and parallel to its mating seal ring to exclude abrasives and eliminate lubricant leakage.

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