Liquid purification or separation – With repair or assembling means – Sliding or rolling on guide means
Patent
1991-07-08
1992-08-18
Dawson, Robert A.
Liquid purification or separation
With repair or assembling means
Sliding or rolling on guide means
210408, 210457, 100211, 264101, B01D 2982
Patent
active
051396653
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and a device for turning in the membrane of a pressure filter for suspensions comprising a boiler-shaped outer jacket, a lid coaxially movable relative to the outer jacket and releasably closing the outer jacket on the open end face thereof, a tubular filter element projecting from the lid coaxially with the axis of the outer jacket, an elastic, tubular membrane arranged coaxially between the outer jacket and the filter element and connected at its one rim to the open end face of the outer jacket and at its other rim to the free end face of the filter element remote from the lid in such a way that when lid and outer jacket are coaxially moved apart, it turns out of the outer jacket and when lid and outer jacket are coaxially brought together, it turns back into the outer jacket again.
A pressure filter of this kind is known from German published patent application 35 16 819. When lid and outer jacket are brought together, i.e., when the filter is being closed, difficulties are known to arise with the turning of the membrane into the outer jacket and, in particular, these lead to the outer side of the membrane entering into rubbing contact with the rim of the outer jacket opening and thereby becoming damaged in the course of time.
The object of the invention is to remedy this deficiency and to indicate a process for turning in the membrane of a pressure filter of the kind mentioned hereinabove which can be carried out without damaging the membrane.
In accordance with the invention, the object is achieved in that when lid and outer jacket are brought together, a negative pressure relative to ambient pressure is formed inside the membrane and to prevent formation of a single fold protruding at the sides beyond the rim of the outer jacket, the membrane is deformed by external influences until a triple or multiple fold no longer protruding at the sides beyond the rim of the outer jacket forms in the membrane.
The following description of a preferred embodiment of such a process and devices suitable for the performance of the process serves in conjunction with the appended drawings to explain the invention in further detail. The drawings show:
FIG. 1 a pressure filter with a reversible membrane in the closed state;
FIG. 2 the filter of FIG. 1 in the open state with the membrane turned out;
FIGS. 3 and 4 sectional views along line 3,4--3,4 in FIG. 2 and FIG. 4;
FIG. 5 schematically a longitudinal sectional view of an open pressure filter with protection means.
The pressure filter illustrated in the drawings comprises a boiler-shaped outer jacket 1 of round cross-section which is closed at its one end face (on the right in FIGS. 1 and 2) and open at its opposite end face. At its open end face, the outer jacket 1 carries a circumferential flange comprised of two parts 2, 3 between which the one rim region 4 of a tubular membrane 5 made of elastic material is firmly clamped. From the outer jacket 1 there extends upwards a suction and compression connection piece 6. The outer jacket 1 is also releasably connected via a carrier construction, not described in detail herein, to a bushing 7 which, for its part, is slidable on a stationary rod 8 parallel to the axis of the outer jacket 1.
A lid 11 for sealed closure of the open end face of the outer jacket 1 is mounted on a machine frame 9 carrying the rod 8 for rotation (double arrow A) coaxially with the outer jacket 1. A pipe 12 protrudes rigidly from the inner side of the lid 11 that faces the outer jacket 1. This pipe 12 carries at its free end an end face flange which is comprised of two parts 13, 14 similarly to the flange at the opening of the outer jacket 1. The other rim 10 of the membrane 5 is firmly clamped between these parts 13, 14.
A tubular filter element 15, for example, in the form of a screen cylinder covered with a filter cloth extends between the inner side of the lid 11 and the flange part 13. The filter element 15 is in sealed contact with the inner side of the lid 11 and the flange part 13, respectively.
When the
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patent: 3753499 (1973-08-01), Gwilliam
patent: 4246122 (1981-01-01), Keat
patent: 4634527 (1987-01-01), Marshall
patent: 4702831 (1987-10-01), Gerteis
patent: 4707256 (1987-11-01), Gerteis
Dawson Robert A.
Fortuna Ana M.
Heinkel Industriezentrifugen GmbH & Co.
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