Patent ID: 7669650
Filing Date: 2010-03-02
Classification: F16J

Abstract:
1. A stuffing box for a rotating rod, comprising: a stationary outer housing having an upper end, a lower end, an exterior surface and an inner surface defining an interior cavity; a tubular rotating inner housing positioned within the interior cavity of the outer housing, the inner housing having an upper end, a lower end, an exterior surface and an inner surface defining an interior bore adapted to accommodate a rod; bearings disposed between the outer housing and the inner housing in a sealed bearing chamber to facilitate rotation of the inner housing; an inner seal assembly providing a seal that prevents the migration of fluids between the inner housing and the rod; an outer seal assembly providing a seal that prevents the migration of fluids between the inner housing and the outer housing; the sealed bearing chamber being filled with hydraulic fluid and disposed between the outer seal assembly and a chamber seal positioned at the upper end of the outer housing; and a circulation port positioned on a sheltered side of the chamber seal opposite to the bearing chamber, the chamber seal purposefully allowing a portion of the hydraulic fluid to leak past the chamber seal to the circulation port.