Rotary fluid-sealing structure using speed-reduction stages
US7464750B2 · kind B2 · utility
23Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2007 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Jan 4, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L27/0816
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention provides for a rotary fluid-sealing structure for a harsh environment which reduces the PV pressure (×velocity) that a sealing system may be exposed through the use of a rotary speed reducing planetary gear system. The system may have multiple stages with the amount of velocity reduction produced by the system being determined by the number of stages and the planetary gear ratios. Several alternatives are presented for the sealing under extreme conditions such as found in the interface between a wash-pipe and a rotary drilling string in a drilling rig.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.