Permanent magnet floating shaft seal
US5137286A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Aug 23, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/441
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A seal ring is spaced radially about a rotating shaft and axially from opposed walls of a housing by permanent directional magnets mounted in the seal ring, shaft and housing. Permanent magnets are disposed about the interior surface of the seal ring and the exterior surface of the shaft, respectively, such that opposite poles lie in radial opposition affording a repelling force therebetween maintaining a radial gap therebetween constant. Permanent directional magnets are disposed on each side of the gaps between the seal ring and opposing axial faces of the housing and have like poles in opposition to one another to locate the seal ring in the axial direction. The gaps between the housing and seal ring and between the seal ring and shaft are maintained by the magnets at minimum clearance, thereby affording a non-contacting seal with well defined leakage paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.