ROD SEAL CARTRIDGE FOR PROGRESSING CAVITY ARTIFICIAL LIFT PUMPS

摘要

A seal cartridge (11) particularly suitable for artificial lift pump rodsealing and for other applications where a rotating drive shaft penetrates apressurized reservoir which is filled with abrasive laden liquids, mixtures orslurries. The cartridge (11) exploits a pressure responsive area of a wearsleeve (19) to eliminate internal bearing (13) running clearance in order toachieve a true-running rubbing surface which is conducive to the longevity ofthe compression-type rotary seals (21, 23, 27) which are employed. A cartridgemounting mechanism (9) is incorporated which overcomes stuffing box to rod (7)misalignment, and is readily adaptable to pumps made by differentmanufacturers. The cartridge (11) provides for leakage annunciation in theevent of failure of a redundant rotary seal (21, 23, 27), and also providesfor automatic pump shut down if a primary rotary seal fails. A redundantsealing arrangement between the wear sleeve (19) and rod (7) is incorporatedwhich is relatively immune to installation damage, and to damage resultingfrom rod run out and vibration. By incorporation of a split drive clamp (39),the cartridge (11) is able to exploit space within the pump yoke which isordinarily reserved for the occasional use of rod clamps. The cartridge (11)also incorporates an active cooling system (71) which dissipates heatgenerated by the seals and bearings.