| 摘要 |
The improved stuffing box (7), adapted to be mounted inside an oil well head incorporating a rotary pump drive (50), includes: a rotating tube (2) having a stationary seal (3) coupled to a drive shaft (1) of the well pump; a substantial transition (6) in diameter, with a lower section (5) of the tube being a suitable outside diameter to receive the component parts of the stuffing box such that the outside diameter thereof can be smaller than the outside diameter (4) of the tube ahead of said transition (6) in diameter; a pressurized oil supply (P) for lubricating the rotary seal packing (15) at t he opposed end of the packing from the internal pressure of the well; the tube being mounted rotatively (8) on the housing (9) such that the lower section of the tube can extend into a web (10) of the stuffing box (7); wherein the stuffing box comprises: located at the bottom end (12) of the tube, an axial stop ring (13), a retaining ring (14) for a first packing (15), followed by a spring (16) mounted within jackets (17), for abutting the spring against the first packing (15) and a second packing (18); an adjustment ring (19) held against said second packing (18) by at least one screw (20) having a conical end (21) received inside at least one mating conical seat (22) formed in the adjustment ring.
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