Integral magnetic fluid centrifugal high speed gas seal and method
US4527802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1983 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Mar 21, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/93
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A magnetic/centrifugal-fluid seal is characterized by a common region serving as both the magnetic gap for the magnetic seal and a fluid-receiving pool for the centrifugal seal. A magnetically permeable annular rotating member extends radially into an annular space defined by a magnetically permeable stationary member to form an annular space of U-shaped cross-section between the members. A closed magnetic circuit is established through the members and the space, which space thereby acts as a magnetic gap to retain the fluid therein when the rotating member is at rest or rotated at low speeds. The common region also retains the fluid when it is centrifugally pressurized during high speed rotation of the rotating member. The fluid remains substantially in the same location during speed-up and slow-down, thereby avoiding compromise of the seal during speed transitions. Recirculation and replacement of the fluid is achieved in conjunction with an injection port arranged to deliver fluid to the common region through the stationary member. A fluid reservoir includes a sight glass to permit viewing the fluid condition and level and is arranged to selectively deliver fluid to the inlet po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.