Low friction face sealed reaction turbine rotors
US7201238B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2004 |
| Grant date | Apr 10, 2007 |
| Priority date | — |
| Expiry date | Apr 12, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Rotary jetting tool including a rotor with axially-opposed pressure-balanced mechanical face seals. Vented upper mechanical face seal enables the rotor to be operated with the relativity low starting torque achievable using reaction forces from offset jets energized with a pressurized fluid. When rotor is displaced axially due to set-down conditions, a pressure chamber exerts a pressure imbalance on the rotor, forcing the rotor to return to a normal operating position. Alternate structure to achieve low starting torque includes a volume disposed adjacent to a lower mechanical face seal, the volume being coupled in fluid communication with the pressurized fluid. Mechanical face seal surfaces are fabricated from ultra-hard materials, such as tungsten carbide, silicon carbide, and diamond. A gage ring designed to ensure the jets remove all of the material from the gage of the protective housing before the tool can advance can be incorporated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.