E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/08 (2006.01) E21B 10/22 (2006.01) F16J 15/34 (2006.01)
Patent
CA 2254667
The present invention provides a mechanical seal for rotary rock bits with a uniquely formed hydrodynamic wave geometry on the sealing faces. The faces are first manufactured flat and smooth, then upon assembly are elastically deformed into a hydrodynamic geometry by the energizing system. One or both of the mechanical sealing faces are lapped flat to less than about six helium light bands and polished to a minimum of about 5 micro-inch RA surface finish across the entire width of the sealing faces. After the 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 deformed surface maintains its finish of less than about five micro-inches RA. 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.
Camco International (uk) Limited
Camco International Inc.
Marks & Clerk
LandOfFree
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