Presses – With drain means for expressed liquid – Drainage through or along surface spanning pressure surfaces
Patent
1997-09-24
1999-10-05
Gerrity, Stephen F.
Presses
With drain means for expressed liquid
Drainage through or along surface spanning pressure surfaces
100145, 100147, B30B 914
Patent
active
059607114
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a conical screw press for compressing and/or removing liquid from bulk material, comprising a screw with screw threads and core in a housing, means for rotating the screw in the housing, an inlet opening for the bulk material which is to be compressed and/or from which liquid is to be removed, an outlet opening for this bulk material, and, where appropriate, at least one outlet opening for the liquid which has been extracted.
BACKGROUND TO THE INVENTION
Screw compressors (screw presses) are used in particular for compressing and/or for pressing liquids out of various bulk materials. The object of this can be, for example, to compress bulk material, for instance to compress waste matter, such as textile waste or paper waste, for the purpose of reducing the volume thereof, to extract liquid from bulk material, for instance to extract oil from oil-containing plant material, or to concentrate bulk material, for instance to press liquid out of material, such as water out of wet bark, where the pressed bark has a higher dry matter content after pressing than it did before pressing, and consequently a higher thermal value on combustion, for heat production for example. The object can also be to use the screw compressor on its own, or the screw compressor included in a system with further devices and/or further screw compressors, to wash the bulk material by means of (repeated) sequential supply of "purer" liquid to the bulk material and removal of the liquid from the bulk material
The internal friction in many bulk materials and the friction between the bulk material and the surfaces of the screw compressor result in an uneven compression of, and/or removal of liquid from, the bulk material in existing screw compressors where the reduction in the volume of the bulk material does not take place in a uniform manner, since, as a result of the internal friction in the bulk material which is being pressed, liquid in the first instance leaves that (surface) area of the bulk material which is exposed to the greatest compressing movement, which results, inter alia, in a low yield of liquid and a low dry matter content of the bulk material and/or entails a high energy consumption. Inappropriate dimensions and designs of conical screw compressors in the prior art also result in a remixing and breaking up of the material inside the screw compressor, which increases the energy consumption and can have a negative effect on the bulk material.
Screw compressors for removal of liquid need to be provided with some form of resistance means for the bulk material at the outlet opening for bulk material in order to prevent re-expansion of compressed bulk material while it is still in contact with the liquid which has been pressed out, which would result in rewetting of the bulk material. Conventional screw compressors therefore have adjustable resistance means such as, for example, flaps which are folded in towards the outlet, or they have resistance means which are mounted on the screw shank and are adjusted towards the outlet by hydraulics. These constructions are delicate, often give rise to leakage of liquid during removal of the liquid, and mean that the screw often has to be mounted at both the inlet end for bulk material and at the outlet end for bulk material.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to make available a conical screw compressor for efficiently and uniformly compressing and/or for removing liquid from bulk material. The conical screw compressor according to the present invention is in this case designed in such a way that the compression of the bulk material which is to be compressed and/or from which liquid is to be removed takes place linearly and uniformly as the bulk material is conveyed through the screw compressor, i.e. the volume inside the conical portion of the screw compressor decreases by essentially the same factor per unit length along the entire length of the conical portion of the screw compressor, and the compression of a
REFERENCES:
patent: 332718 (1885-12-01), Lafferty
patent: 780415 (1905-01-01), Eavenson
patent: 1750764 (1930-03-01), Schaefer
patent: 1851191 (1932-03-01), Lang
patent: 2055263 (1936-09-01), Robinson et al.
patent: 2157161 (1939-05-01), Carlson
patent: 2386052 (1945-10-01), Lundy
patent: 2609744 (1952-09-01), Rietz
patent: 3044391 (1962-07-01), Pellett
patent: 3054343 (1962-09-01), Pellett
patent: 3400654 (1968-09-01), Vincent
patent: 3943033 (1976-03-01), Wallen
Gerrity Stephen F.
Lennart Borjesson
Nordin Ulf
Roland Erikkson
LandOfFree
Screw compressor and outlet portion for screw compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screw compressor and outlet portion for screw compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw compressor and outlet portion for screw compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1160132