Bi-directional unsupported area seal
US4907812A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1986 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Oct 6, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid pressure sealing assembly 40 adapted for bi-directional sealing of the annulus between two coaxially disposed cylindrical surfaces 16, 48 and including a stack of packing rings 41 sandwiched between a pair of retainer rings 43, 45. The packing assembly is held together by a plurality of pins 80, each of which extends through aligned openings in the packing rings 41 and into blind bores 81, 82 in the respective retainer rings 43, 45 on both sides of the packing rings. The surface of a retainer ring at each end of the sealing assembly 40 which is to be exposed to fluid pressure in the annulus is of greater area than the surface contact area of the adjacent packing ring 41 contacting the retainer ring because of the cross-sectional area of the pin holes so that the force which is transmitted to the packing rings from a retainer ring is amplified and increases the packing and sealing effect of the packing rings. Means 53 for mechanically applying a pre-load to the sealing assembly 40 may also be included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.