Non-contacting mechanical face seal of the gap-type
US5246295A · kind A · utility
Inventor
Key dates
| Filing date | Oct 30, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Oct 30, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3432
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rotary mechanical face seal for preventing leakage of a fluid, either liquid or gas, across two relatively rotating surfaces. The seal is of the non-contacting mechanical type in which a predetermined spacing is maintained between the relatively rotatable sealing washers by formation of a pressurized fluid film between the relatively rotating surfaces. The opposed faces are constructed to provide a separation of the faces at start-up and thereby prevent damage or destruction to the faces before design pressures are achieved. This is achieved by providing at least one of the opposed faces with a deflection bearing portion which causes the necessary deflections under load. The bearing portion comprises a spaced series of lift pad sections. A variety of lift pad constructions can be used. The seal also includes a hydrodynamic radial bearing which centers the shaft in the static state to avoid shaft runout.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.