Presses – With drain means for expressed liquid – Drainage through or along surface spanning pressure surfaces
Patent
1995-03-20
1996-10-22
Gerrity, Stephen F.
Presses
With drain means for expressed liquid
Drainage through or along surface spanning pressure surfaces
100117, 100297, 210489, 210498, B30B 914, B30B 926
Patent
active
055666116
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for separating liquid from fibrous matter suspensions, comprising a multiple-layered solid retention means having liquid passages, composed of a screen and a supporting body for the screen, as well as an apparatus in the form of a worm press.
An apparatus of this type is known from DE-C-112321. The press there described serves for pressing liquids from solids, such as pressing of juices, water or oil from suitable substances. The solids retention means of that press is of multiple-layered construction and comprises an inner envelope having short slots arranged longitudinally in parallel rows. A woven wire fabric is provided above this envelope, supported by yet a further envelope. In further known apparatus of this kind perforated plates were usually used as a screen. These are usually fitted on a support means, the support means comprising countersunk holes into each of which a plurality of the apertures of the screen enter. This involves a great problem in that the perforation spacings of the screen and of the support means can virtually not be made to match, as a result of which a major part of the perforations of the screen terminate on the surface of the support means and cannot drain. In the event of fibrous suspensions, the further problem arises that the perforations of the support means become blocked by the fibres, as a result of which the dewatering capacity of the apparatus greatly diminishes. Here to provide a remedy, is one of the objects of the invention.
SUMMARY OF THE INVENTION
The invention is primarily characterised in that, that layer which faces the fibrous suspension takes the form of a screen with apertures and that layer which faces away from the solids-liquid mixture is designed as a support body having slot-shaped apertures and that at least one free space for liquid distribution is provided between the screen and the supporting body. The result of this is that the liquid passages of one layer are not obscured by an adjoining layer which would interfere with the passage of liquid.
According to an advantageous embodiment of the invention, the slot-shaped passages of the supporting body are arranged parallel to one another, uniformly distributed over its surface and preferably arranged in mutually staggered rows.
Preferably according to the invention the cross section of the passages of the supporting body in downstream direction of the liquid increases. This substantially prevents blocking of the passages by fibres.
Expediently, according to the invention, the free space is provided in the form of channels between the screen and the supporting body. The formation of channels between the screen and the supporting body actually makes possible effective cleaning from outside. For that purpose water is introduced by means of a flat jet nozzle into one of the slot-shaped passages, is pressed through the channels and forced out through the next slots.
Advantageously, according to the invention, the channels are formed by spacers, in particular battens fitted between the screen and the supporting body.
According to a further advantageous embodiment of the invention, the channels are formed by grooves provided in the screen. This permits reduction of the structural height of the apparatus.
According to an advantageous embodiment of the invention, the channels are arranged at least essentially transversely in relation to the slot shaped passages of the supporting body. In this manner an optimal drainage of the liquid is attained, such that with the apparatus a high dewatering capacity is attainable.
In the past a number of passages were obscured by the mounting flanges, whereby the dewatering capacity was reduced.
Advantageously, according to the present invention, channels are provided in the marginal region of the supporting body in the form of grooves provided in the supporting body, extending longitudinally to and as a continuation of the apertures.
According to an advantageous embodiment of the invention, the passage
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Heindler Gerhard
Mraz Peter
Paier Gerhard
Scheucher Peter
Schinninger Walter
Andritz- Patentverwaltungs-Gesellschaft m.b.H
Gerrity Stephen F.
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