Rotary machine shaft seal
US5199718A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1992 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Apr 13, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C15/0038
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rotary hydraulic machine includes a housing, a shaft carried for rotation and extending from the housing, and a shaft seal carried by the housing in sealing engagement with the shaft to prevent leakage of fluid along the shaft. The shaft seal has an annular shell adapted for mounting to the housing surrounding the shaft and radially spaced therefrom. A pair of annular resilient sealing rings are carried by the shell and extend radially inwardly therefrom into rotary sealing engagement with the shaft. A pressure relief valve includes at least one opening that extends radially through the shell between the rings, and a resilient band surrounding the shell externally of and overlying such opening. Pressure of fluid urges the band away from the shell to permit flow of fluid through the shell opening externally of the shell and band, while the band prevents entry of dirt or debris through the opening into the shell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.