Seal ring design
US5490679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1993 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Dec 20, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3472
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mechanical end face seal having a first seal ring with a generally radially extending sealing face, a second seal ring having a sealing face opposite to and in mating relation with the sealing face of the first seal ring, the second seal ring having a generally radially extending back face removed from and oppositely disposed to said sealing face, the back face including an annular shoulder at the outer diameter defined by an annular axially extending flange which forms an annular section between the flange and the ring outer diameter. The annular section displaces the ring centroid further toward the seal interface and also toward the ring inner diameter, thus minimizing axial rotational and pressure forces acting on the axially movable ring to stabilize the ring. Stabilization of the ring permits balancing the seal to over 80% for dry-running with a gas lubricant at over 300 psig pressure differential and high rotational speeds. A second seal may be used having a second primary ring within a similar shoulder to provide a similar effect, the second seal together with the first seal defining a buffer chamber between them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.