Magnetic fluid sealing device
US4605233A · kind A · utility
29Cited by
0References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1983 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Sep 13, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/43
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A magnetic fluid sealing device has a housing, a shaft accommodated in the housing, a plurality of permanent magnets disposed, in series, coaxially with each other, and polepieces disposed between the two adjoining magnets. The polepieces have one or more concave grooves to form a plurality of knife edges for concentrating magnetic flux. The density of magnetic flux passing through the edge or edges located adjacent to a vacuum environment is more increased than that through other edges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.