Shaft seal
US3963247A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1975 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Feb 19, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/406
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A visco-type seal is disclosed wherein a sealing pressure is built up in a fluid by means of one or more helical windings, the fluid being enclosed in a narrow clearance between a stator and a rotor. The alignment of the rotor within the stator is insured by providing a thin layer of material at the outer ends of at least one of the helical windings so that the clearance in a radial direction between the stator and the rotor at this location is less than the clearance existing in a radial direction between the helical windings and the stator. In one embodiment, the stator is designed as a sleeve which has a flexible connection in the radial direction with respect to a wall. The stator or a sealing element fastened thereto is movable in an axial direction by means of a resilient force to obtain a proper sealing when the device is at rest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.