Wellhead sealing device of sucker-rod pumping machine
US11261687B2 · kind B2 · utility
0Cited by
7References
4Claims
0Family size
Inventors
Key dates
| Filing date | Aug 31, 2020 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Aug 31, 2040 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16N11/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A polished rod sealing device for an oil pumping machine includes a built-in stuffing box. The built-in stuffing box is arranged inside oil pipe enlargement press cap and can seal the polished rod of the oil pumping machine. The sealing device maintains dynamic coaxiality between the polished rod and the stuffing box, and reduces eccentric wear of the sealing packing resulted from the polished rod. The sealing device also provides lubrication between the polished rod and the sealing packing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.