Rod seal cartridge for progressing cavity artificial lift pumps
US5823541A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 12, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C15/0038
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A seal cartridge particularly suitable for artificial lift pump rod sealing and for other applications where a rotating drive shaft penetrates a pressurized reservoir which is filled with abrasive-laden liquids, mixtures or slurries. The cartridge exploits a pressure responsive area of a wear sleeve to eliminate internal bearing running clearance in order to achieve a true-running rubbing surface which is conducive to the longevity of the compression-type rotary seals which are employed. A cartridge mounting mechanism is incorporated which overcomes stuffing box to rod misalignment, and is readily adaptable to pumps made by different manufacturers. The cartridge provides for leakage annunciation in the event of failure of a redundant rotary seal, and also provides for automatic pump shut down if a primary rotary seals fails. A redundant sealing arrangement between the wear sleeve and rod is incorporated which is relatively immune to installation damage, and to damage resulting from rod run out and vibration. By incorporation of a split drive clamp, the cartridge is able to exploit space within the pump yoke which is ordinarily reserved for the occasional use of rod clamps. The cart…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.