Rotary joint for alternating media
US6406065B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jul 7, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86268
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a rotary joint for alternating passage of a lubricating medium and a non-lubricating medium from a stationary (3) to a rotating machine part (1), having a first seal (7) in the form of two flat, substantially circular ring-shaped sliding sealing surfaces (4, 6) arranged so as to slide one on the other, which sealing surfaces (4, 6) are substantially concentric relative to the axis of rotation (10) of the rotating machine part (1) and may be moved at least far enough from one another, in the axial direction, that they do not come into contact with each other during rotation of the rotating machine part (1). To provide a rotary joint of the above-mentioned type, which, despite so-called dry run safety, nonetheless exhibits only slight leakage losses even during passage of a non-lubricating medium and even when the rotating machine part rotates at high speeds, it is proposed according to the invention that an additional cylindrical seal (17) be provided, the sealing surfaces of which are formed of cylindrical circumferential surfaces (14, 16) arranged concentrically relative to one another with a narrow sealing gap, the cylindrical seal (17) being arra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.