Rotary shaft seal assembly
US4600032A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1985 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6035
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rotary valve having a housing enclosing a drive shaft and a rotor assembly. The housing has an inlet, an outlet, an access end, and a detachable closure plate for closing the access end. The drive shaft, which is journalled in the housing, has a shaft end disposed generally between the inlet and the outlet and the rotor assembly is removably mounted on this shaft end. The rotor assembly has a surface including at least one recess, which is communicable with the inlet and with the outlet by rotating the drive shaft, for conveying material from the inlet to the outlet. The housing has an inwardly-disposed cylindrical surface generally concentric about the drive shaft. A teflon seal is positioned between the drive shaft and the cylindrical surface and has a seal outer surface engaging the cylindrical surface. The seal is formed of a plurality of adjacent rings configured so that they expand radially when axial pressure is applied. A retainer collar threads along the drive shaft axis and retains the seal relative to the drive shaft by applying axial pressure so that the seal rotates with the drive shaft and the seal outer surface rotates relative to, and provides a seal with, the cyl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.