Continuously and automatically functioning device for the drainage of sludge, especially of sewage sludge
US5122263A · kind A · utility
Inventor
Key dates
| Filing date | Jul 30, 1990 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Jul 30, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A continuously and automatically functioning device for the drainage of sludge treated with a flocculent, especially of sewage sludge, comprising a screw conveyor installation with a driven conveyor screw consisting of shaft (16) and helix (17) and a screen wall (18). The screw conveyor installation possesses a first cylindrical area (10) of a large diameter and gap width followed by a conical area (12) for purposes of volume reduction in the throughput direction of the sludge. Connected to the conical area (12) of the screw conveyor installation is at least one pressure area (13) which, with the diameter of the shaft (16) being constant, possesses a decreasing lead of the conveyor helix (17) at the side of the entrance, and in its final area carries a conical piece (49) placed upon the shaft (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.