Wellhead sealing device of sucker-rod pumping machine
US10760367B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jan 29, 2016 |
| Grant date | Sep 1, 2020 |
| Priority date | — |
| Expiry date | Jan 29, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16N11/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Provided is a wellhead sealing device of a sucker-rod pumping machine, including a flexible connection unit, and further including a blowout prevention unit, a closing unit, a declination rectification unit and a lubrication unit, wherein the flexible connection unit is arranged between a wellhead and a packing box, and includes a lower flexible sealing sleeve (37), a lower flexible sealing sleeve housing (12), a sealing steel ring (11) and an upper flexible sealing sleeve (10). Portions above the flexible connection unit follow integrally a polished rod (7) constantly to swing, such that a packing (9) is dynamically coaxial with the polished rod (7) and the problem of eccentric wear of the packing can be completely solved. Furthermore, the device can also solve the problems of static coaxiality and lubrication between the polished rod (7) and the packing (9), as well as the problem of blowout prevention when the polished rod (7) is broken off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.