Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Material level or thickness responsive
Patent
1992-04-17
1993-09-14
Drodge, Joseph W.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Material level or thickness responsive
100 53, 100211, 210104, 210106, 210130, 210350, 417 9, B01D 2900
Patent
active
052445674
DESCRIPTION:
BRIEF SUMMARY
The invention relates along a device for operating a pressure filter for suspensions comprising a boiler-shaped outer casing, a lid releasably closing the outer casing at its open end, a tubular filter element projecting from the lid coaxially to the axis of the outer casing, an invertable membrane arranged coaxially between the outer casing and the filter element and a suction and pressure pipe connection on the outer casing.
A pressure filter of this type is known from DE-A-3517032. During operation of the filter, an overpressure or a vacuum acting on the membrane can be generated via the suction and pressure connection pipe provided on the outer casing of the filter. In this respect, the overpressure can be generated with the aid of a fluid pressure medium and the vacuum with the aid of a vacuum pump. If the membrane is porous, there is the risk of toxic suspension possibly passing into the fluid pressure medium or into the open air via the vacuum pump which can cause harm to people and the environment.
It is true that DE-A-2703598 discloses a pressure supply unit for a pressure filter, however no measures are provided therein for making use of the pressure supply unit for control operations, e.g., in case of a porous membrane.
The object of the invention is to design a generic device in such a way that porosities of the membrane can be detected and the escape of suspension into the environment is prevented even with a porous membrane.
According to the invention, the object is accomplished by the following features:
A. a container for a fluid pressure medium, the pressure medium filling the lower part of the container and a gas space is available in the container above the liquid level of the pressure medium;
B. a first line for transferring pressure medium from the lower part of the container into the space between outer casing and membrane of the pressure filter;
C. a pressure pump in the first line;
D. a second line connecting the space between outer casing and membrane of the pressure filter with the gas space of the container;
E. a suction pump for generating a vacuum in the gas space of the container;
F. A fluid level indicator on the container;
G. Adjustable sensing elements for sensing predetermined fluid levels in the container; and
H. Switches connected with the sensing elements, these switches reacting when the predetermined fluid levels are reached and triggering control procedures for the pressure filter, especially a switching-off of the pumps.
The following description of preferred embodiments of the invention serves, in conjunction with the attached drawings, to explain the invention further. In the drawings:
FIG. 1 shows a pressure filter in the closed state with a device for operating the filter and
FIG. 2 shows the filter of FIG. 1 in the opened state.
The pressure filter illustrated in the drawings comprises a boiler-shaped outer casing 1 which has a circular cross section, is closed at one end face (to the right in FIGS. 1 and 2) and open at its opposite end face. At its open end face the outer casing 1 bears a circumferential flange consisting of two parts 2, 3, between which one edge region 4 of a tubular membrane 5 consisting of elastically flexible material is securely clamped. A suction and pressure connection pipe 6 projects upwards from the outer casing 1. The outer casing 1 is also releasably connected via a supporting structure with a bushing 7 which is displaceable on a stationary bar 8 parallel to the axis of the outer casing.
A lid 11 for sealingly closing the open end face of the outer casing 1 is rigidly or rotatably mounted in a stationary machine frame 9 bearing the bar 8. A tube 12 projects rigidly from the inner side of the lid 11 facing the outer casing 1. This tube bears on its free end a flange which consists of two parts 13, 14 in a similar manner to the flange on the open end face of the outer casing 1. The other edge 10 of the membrane 5 is securely clamped between these parts 13, 14.
A tubular filter element 15 extends between the inner side of the lid 11 an
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Drodge Joseph W.
Heinkel Industriezentrifugen GmbH & Co.
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