Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1993-05-13
1995-07-25
Drodge, Joseph W.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
138111, 2103232, 21033301, 210438, 553501, B01D 2966
Patent
active
054359112
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a back-washable filter element which is to be installed in a pressure vessel and has a supporting body of perforated tubes, a central tube, and a head part.
A filter element of this type is known from U.S. Pat. No. 4,473,472. The known filter element which is suitable for residual volume filtration includes a central tube which is closed along its entire length. A filtrate is removed through the central tube and when the filtration is concluded a backwashing agent is fed in opposite the filtration direction for cleaning the filter medium. The central tube is surrounded by perforated tubes to support the filter medium, generally a woven fabric. In the known filter element the filtrate can only be removed via the lower opening of the central tube. This is disadvantageous in that the capacity of the filter is greatly limited by the restricted lumen of the central tube, as is the speed and efficiency of the backwashing.
SUMMARY OF THE INVENTION
The object of the invention is to increase the performance of a filter element of this type and simultaneously to enable a drying and dry discharging of a filter cake.
This object is met according to the invention in that the head part of the filter element is provided with at least one bore hole facing the upper openings of the tubes and an additional bore hole and a seat for receiving a pressure control device.
The central tube is advisably connected with the openings of the tubes serving as supporting tubes via one or more bore holes or ducts. This has the advantage that the filtration capacity can be considerably augmented and a high backwashing capacity is available.
It is advisable to provide a pressure control unit by which the through-flow capacity can be controlled.
It is therefore advantageous to construct the pressure control unit as a valve.
The valve can be a diaphragm valve or a ball valve.
Further, it is advantageous to provide a check valve.
It is especially advisable to combine the pressure control unit with a diaphragm valve.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal section through the filter element according to the invention;
FIG. 2 shows a variant of the filter element according to the invention;
FIG. 3 shows a section of a construction of a valve for the filter element according to the invention;
FIG. 4 shows another construction of a valve according to FIG. 3;
DESCRIPTION OF PREFERRED EMBODIMENTS
According to FIG. 1, the filter element includes a filtration part 1 and a head part 2. The filtration part 1 has a central tube 3 and perforated tubes arranged around the latter as supporting elements. The two perforated tubes 4, 4' are enclosed by a woven fabric 5 as filter medium, which is fastened in a known manner. The head part 2 includes a plate 6 which is provided with a bore hole 7 and a bore hole 8 as well as a seat 9. The bore holes 7 and 8 can be closed by an inflatable diaphragm 10 in the seat 9. The diaphragm 10 is constructed as part of a diaphragm valve. The upper part 11 of the head 2 forms a flange used for fastening the entire filter element. The lower portion of the filter element is closed by a base plate 12 with a central opening.
FIG. 2 shows a variant of the head part 2. A plate 6' is provided with a lower bore hole 7' and an upper bore hole 8' as well as a seat 9'. A ball 13 is provided in the seat 9' for closing the latter 9' and functions as a part of a ball valve.
FIG. 3 shows the left-hand portion of the head 2 of FIG. 1. In this instance, the plate 6 has a lateral wall 14 located radially outwardly, and the valve is constructed as a double-diaph
REFERENCES:
patent: 1329171 (1920-01-01), Garry et al.
patent: 3382978 (1968-05-01), Rosean
patent: 4041592 (1977-08-01), Kelm
patent: 4473472 (1984-09-01), Muller
patent: 4695375 (1987-09-01), Tyler
patent: 4752403 (1988-06-01), Allred
patent: 4832841 (1989-05-01), Gutman
patent: 4919801 (1990-04-01), Hobson
patent: 4973404 (1990-11-01), Weber et al.
patent: 5128038 (1992-07-01), Slavitscheck et al.
patent: 5133858 (1992-07-01), Walz et al.
patent: 5135665 (1992-08-01), Birkenstock et al.
DrM Dr. Mueller AG
Drodge Joseph W.
Striker Michael J.
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