Seal ring
US9028130B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2009 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Jun 15, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/60
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A seal ring is provided which allows the interior of a cylinder 1 of a screw extruder to be maintained at elevated temperature and elevated pressure, thus suppressing a variation in the pressure in the cylinder 1. In a special seal ring 300 attached to a screw shaft 7 in the cylinder of the screw extruder so as to be rotatable integrally with the screw shaft 7, thus restraining a material to be treated from being fed from upstream to downstream in the cylinder, a lead groove 317 extending in an axial direction of the shaft 7 is formed in an outer circumferential surface 316 opposing with a predetermined gap to an inner circumferential surface 1a of the cylinder. The lead groove 317 serves to disturb the flow of the material to be treated passing between the outer circumferential surface 316 and the inner wall surface 1a of the cylinder 1 to complex the flow. This stabilizes feeding resistance to suppress a variation in the pressure in the cylinder 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.