Hydrodynamic face seal with grooved sealing dam for zero-leakage
US6446976B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Oct 4, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3428
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mechanical face seal includes a pair of relatively rotatable seal rings having opposing seal faces which define a sealing region therebetween. The sealing region extends radially between the inside and outside diameters of the seal rings to seal a fluid in a sealing chamber near one diameter thereof. The seal faces are provided with hydrodynamic lift features near the sealing chamber to provide a lift load that permits a liquid between the seal faces to form a fluid film therebetween. The hydrodynamic lift features primarily function to hydrodynamically generate a hydrodynamic lift load while a plurality of concentric grooves are also provided on the seal face to serve as a leakage barrier during shaft rotation of the that prevents the liquid film from leaking across the seal faces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.