EP0394236A1 - Filter plate - Google Patents
Filter plateInfo
- Publication number
- EP0394236A1 EP0394236A1 EP19880903989 EP88903989A EP0394236A1 EP 0394236 A1 EP0394236 A1 EP 0394236A1 EP 19880903989 EP19880903989 EP 19880903989 EP 88903989 A EP88903989 A EP 88903989A EP 0394236 A1 EP0394236 A1 EP 0394236A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- filter
- filter plate
- area
- cloth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000004744 fabric Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 3
- 238000005192 partition Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
Definitions
- the present invention relates to a filter plate on which a filter cloth is disposed and which is used for filtering off solid particles from a liquid.
- Filter cloths are today employed in many different applications for separating solid particles from liquids, e.g. in water purification.
- the filter cloth is often disposed horizontally or freely suspended at an angle.
- a big problem in the context is the reduced flow capacity resulting from surface tensions present in the liquid phase and generated on the underside of the filter cloth.
- ribs transversal to the flow direction are often mounted on the underside of the filter cloth.
- Another serious disadvantage of known filter systems is that the entire cloth must be replaced in case it is damaged, which is a complicated, time-wasting and expensive opera ⁇ tion because the cloth is usually mounted in a frame.
- the above-mentioned short- comings have been obviated by means of an apertured filter plate on which a filter cloth is disposed.
- the filter cloth is attached to the underlying filter plate, preferably by gluing or welding, along essentially the whole contact surface of the filter cloth with the filter plate. If the filter cloth is damaged, the filter plate apertures coincident with the position of the damage on the cloth can easily be plugged, without necessitating replacement of the entire filter cloth. Such plugging of an aperture reduces the flow capacity by less than 1 per mil for each square meter of the filter surface.
- Another advantage of the present invention is that the filter plate is easy to mount in a filtering apparatus since the filter plate and the filter cloth form an integral part.
- the filter plate according to the present invention is characterised in that it has a large number of aper ⁇ tures, the area of each individual aperture being at most 2.25 cm 2, preferably at most 1 cm2, that the total free open area of the plate is at least 70 % of the total plate area, and that the thickness of the plate is at least 5 mm.
- the filter plate according to the invention is mounted horizontally or preferably suspended at an angle.
- the flow of liquid to be filtrated is supplied to the filter plate from above and preferably at one of the edges of the filter plate when this is mounted at an angle, the liquid flow gradually urging the filtered-off sludge towards the opposite edge, at the same time as purified water flows out of the underside of the filter plate.
- the filter cloth When the filter cloth has become completely clogg ⁇ ed, it is sprayed with water from below to clean it.
- the limited opening areas of the filter plate break . the surface tensions on the underside of the filter cloth, whereby the flow is improved.
- a critical feature of the invention is that the
- each aperture is at most 2.25 cm , preferably
- each aperture in the filter plate is most 1 cm
- the plate has a thickness of 10 mm
- the total free open area is about 80 % of the total area
- the apertures are square-shaped with 9 mm sides and 1 mm wide parti- tions between the apertures.
- Fig. 1 is a view from above of a portion of an embodiment of the filter plate according to the inven- tion.
- Fig. 2 is a side view of a portion of the filter plate illustrated in Fig. 1.
- a filter plate 1 has a large number of square-shaped apertures 2 separated by partitions 3.
- the filter plate in its entirety is shaped as a rectangle having the dimensions 1200 x
- a filter cloth 4 is glued or welded, at 5, across the entire contact surface with the filter plate, the glue or weld being applied to the contact surface on top of the partition walls 3 and the outer sides of the plate.
- the filter plate is manufactured of plastic material, preferably acrylic plastic, while the filter cloth is manufactured of steel, preferably acidproof steel.
- the filter cloth preferably has a mesh size of about 20-150 cm and an open area of about 25-50 % of the total area.
- the thickness of the partitions 3 is 1 mm.
- the total free open area of the plate is about 80 % of the total area.
- filter plate assembly A 0.81 10 1400 1 filter plate assembly B 1.44 13 1000 0.71 filter plate assembly C 2.25 15 700 0.50 filter plate assembly D 3.61 10 550 0.39
- the flow capacity of filter plate assembly B was only 71% of the flow capacity of assembly A. Furthermore, the flow capaci ⁇ ties of assemblies C and D were only 50 % and 39 % respectively, of the flow capacity of assembly A. This shows that a decrease of the opening area of the filter plate in this range results in a notable increase of the flow capacity, and this increase becomes especially
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtration Of Liquid (AREA)
Abstract
La présente invention décrit une plaque de filtrage (1) sur laquelle une toile filtrante (4) est disposée sur toute la largeur du côté supérieur et est collée ou soudée aux côtés extérieurs, ladite plaque de filtrage étant utilisée pour extraire par filtrage des particules contenues dans un liquide. La plaque comporte un grand nombre d'ouvertures (2), la surface de chacune ne dépassant pas 2,25 cm2. La surface totale des ouvertures de la plaque représente 70 à 90 % de la surface totale celle-ci et l'épaisseur de la plaque est d'au moins 5 mm.The present invention describes a filter plate (1) on which a filter cloth (4) is arranged over the entire width of the upper side and is glued or welded to the outer sides, said filter plate being used for filtering out contained particles. in a liquid. The plate has a large number of openings (2), the surface of each not exceeding 2.25 cm2. The total surface of the plate openings represents 70 to 90% of the total surface thereof and the thickness of the plate is at least 5 mm.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8701820A SE463698B (en) | 1987-05-04 | 1987-05-04 | FILTER PLATE |
SE8701820 | 1987-05-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0394236A1 true EP0394236A1 (en) | 1990-10-31 |
Family
ID=20368396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880903989 Ceased EP0394236A1 (en) | 1987-05-04 | 1988-05-04 | Filter plate |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0394236A1 (en) |
AU (1) | AU1711288A (en) |
DK (1) | DK538789A (en) |
SE (1) | SE463698B (en) |
WO (1) | WO1988008739A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2245191B (en) * | 1990-06-22 | 1994-01-26 | United Wire Ltd | Filter screen assembly |
GB2266475B (en) * | 1992-04-21 | 1995-08-16 | Alfa Laval Separation Ab | Mounting and tensioning arrangements for screens |
CH685760A5 (en) * | 1992-06-25 | 1995-09-29 | Guenther Weikmann | A method of filtering out foreign substances and apparatus therefor. |
SE539965C2 (en) | 2015-06-23 | 2018-02-13 | Veolia Water Solutions & Tech | Filter panel with a controlled liquid lift, and a drum filter for filtering liquid |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3747770A (en) * | 1969-06-20 | 1973-07-24 | Zurn Ind Inc | Filter screen |
SE379647B (en) * | 1970-02-18 | 1975-10-20 | A J Walker | |
US4038187A (en) * | 1976-02-03 | 1977-07-26 | Envirex Inc. | Microscreen drum |
-
1987
- 1987-05-04 SE SE8701820A patent/SE463698B/en not_active IP Right Cessation
-
1988
- 1988-05-04 EP EP19880903989 patent/EP0394236A1/en not_active Ceased
- 1988-05-04 WO PCT/SE1988/000228 patent/WO1988008739A1/en not_active Application Discontinuation
- 1988-05-04 AU AU17112/88A patent/AU1711288A/en not_active Abandoned
-
1989
- 1989-10-27 DK DK538789A patent/DK538789A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8808739A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE8701820L (en) | 1988-11-05 |
AU1711288A (en) | 1988-12-06 |
DK538789A (en) | 1989-11-03 |
SE463698B (en) | 1991-01-14 |
DK538789D0 (en) | 1989-10-27 |
SE8701820D0 (en) | 1987-05-04 |
WO1988008739A1 (en) | 1988-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19891102 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB NL |
|
17Q | First examination report despatched |
Effective date: 19910902 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 19921011 |