CA2070341A1 - Disc filter and filter element for disc filter - Google Patents
Disc filter and filter element for disc filterInfo
- Publication number
- CA2070341A1 CA2070341A1 CA 2070341 CA2070341A CA2070341A1 CA 2070341 A1 CA2070341 A1 CA 2070341A1 CA 2070341 CA2070341 CA 2070341 CA 2070341 A CA2070341 A CA 2070341A CA 2070341 A1 CA2070341 A1 CA 2070341A1
- Authority
- CA
- Canada
- Prior art keywords
- filter
- frame
- filter element
- fastened
- corrugations
- 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.)
- Abandoned
Links
- 238000003466 welding Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000706 filtrate Substances 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000002844 continuous effect Effects 0.000 claims 1
- 108091006146 Channels Proteins 0.000 description 13
- 229910052729 chemical element Inorganic materials 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
- B01D33/23—Construction of discs or component sectors thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Abstract A disc filter and a filter element for a disc filter.
A disc filter comprises sector-shaped filter elements (2) discoidally mounted around a shaft (1) thereof.
The filter element (2) has a plate-shaped frame (9) with recesses and elevations and filter surfaces (11) on both sides thereof.
The disc filter comprises elongated fastening means (4) parallel with the edges of the filter elements (2), which fastening means are provided with a fluted groove, in which the edge of the filter element (2) is positioned, and the filter elements (2) of the disc filter are elements forming an integral whole, in which the filter surfaces (11) are fastened to the elevations of the frame (9) substantially permanently in such a way that the frame (9) and the filter sur-faces (11) form an integral element to be replaced as a whole. The recesses and elevations of the filter element have a corrugated form and the filter sur-faces (11) are fastened for instance by hot welding to the corrugation ribs in such a way that the frame (9) and the filter surfaces (11) form an integral filter element to be replaced as a whole.
(Figure 2)
A disc filter comprises sector-shaped filter elements (2) discoidally mounted around a shaft (1) thereof.
The filter element (2) has a plate-shaped frame (9) with recesses and elevations and filter surfaces (11) on both sides thereof.
The disc filter comprises elongated fastening means (4) parallel with the edges of the filter elements (2), which fastening means are provided with a fluted groove, in which the edge of the filter element (2) is positioned, and the filter elements (2) of the disc filter are elements forming an integral whole, in which the filter surfaces (11) are fastened to the elevations of the frame (9) substantially permanently in such a way that the frame (9) and the filter sur-faces (11) form an integral element to be replaced as a whole. The recesses and elevations of the filter element have a corrugated form and the filter sur-faces (11) are fastened for instance by hot welding to the corrugation ribs in such a way that the frame (9) and the filter surfaces (11) form an integral filter element to be replaced as a whole.
(Figure 2)
Description
2~
Disc filter and filter element for disc filter The invention relates to a disc filter for fil-tering water from a suspension, which filter has a shaft and a plurality of sector-shaped filter plates mounted discoidally around the shaft, each plate com-prising a frame of a plate-shaped material provided with recesses and elevations, the recesses and ele-vations of which frame form between themselves fil-trate channels for removing the filtered waterthrough one outlet or several outlets at the narrower end of the filter plate inside the shaft, and filter surfaces mounted on the frame on ~oth sides thereof, through which surfaces the water to be filtered is able to flow into the filtrate channels.
The invention relates further to a filter ele-ment for a disc filter for the separation of water from a suspension, which filter element has a sector-shaped frame of a plate-shaped material provided with recesses and elevations, the recesses and elevations of which frame form between themselves filtrate chan-nels for removing the filtered water through one out-let or several outlets at the narrower end of the filter plate, and a filter surface mounted on the frame on both sides thereof, through which surface the water is able to flow through the filtrate chan-nels to the outlet end of the filter elPment.
Different kinds of disc filters are used in the paper and mining industry for filtering water from a pulp mixture or a suspension including metal and min-eral particles either to separate the water from these materials or to concentrate the suspension.
Such a filter comprises several filter elements, i.e.
filter plates, typically with a steady frame of met-al, on which is fastened a separate filter surface, , '' ~ , , .
' ~ ~:
z~
such as a filter bag or the like. The filter bag ismounted on the frame and fastened and tightened to it in different ways, whereby the water is able to get through ~he filter surface and flow through the chan-nels of the frame to outlets on one side of the frameand further through the outlets out. The disc filters comprise sector-shaped filter elements fastened around the cylindrical shat to form an integral cir-cumference, several such filter discs axially after each other.
The filter bag and filter surfaces of prior art filter elements wear and get damaged evPry now and then so that they must be replaced by new ones. For this, the filter element is detached from the filter and the filter surface, such as a filter bag, mounted thereon is removed, after which a new filter bag is positioned on it and the element is mounted back to its place. It is rather wearisome to detach the ele-ment and to fasten and tighten it in place and if the filters cGmprise several elements and several rows of discs, a long time is needed for one replacement of the filter elements. It also takes time to remove the filter bags and to mount new ones, and therefore, a replacement of the filter surfaces of the filter ele-ments is rather expensive and time-consuming. In ad-dition to this, costs are caused due to the fact that the process stands still or because the production during replacement is not as effective as at normal operation.
Several different models of filter elements have been manufactur~d, one of which is known from Finnish Patent Application 883061. It describes a filter element consisting of two perforated and grooved plates mounted at a distance from each other, between which plates remains a channel for a liquid .
.:
; ,, ~ ~-:, to flow through the perforations. Ona edge of the element has outlets for removing the liquid and the filter surfaces of this filter element cGnsist of a filter bag, which is mounted on the frame and shrunk by means of heat treatment to lie tightly on it.
On the other hand, Finnish Patent 73141 and U.S. Patent 3,948,779 disclose a solution in which the frame of the filter element consists of a corru-gated plate of metal or the llke. Also in this solu-tion, the filter surfaces are formed by mounting afilter bag on the frame consisting o~ corrugated plate and by tightening it in place by means of heat treatment. A drawback of the prior art element struc-tures is that the frame of the filter element must be detached from the filter in order that the filter surface, i.e. the filter bag, could be replaced, by detaching at first the former and by mounting a new one after that. Moreover, after the new filter bag has been mounted the elements are fastened to the disc filter by securing its frame by means of bolts and nuts. This is difficult and time-consuming, and such a filter element is also heavy and difficult to handle.
The object of this invention is to provide such a disc filter and also such a filter element for the filter by means of which the filter elements are simply and easily mounted and the mounting can take place quickly in such a way that a replacement of the filter elements as a whole will be simpler and cheap-er than according to prior art solutions. The discfilter of the invention is characterized in that elongated fastening means provided with fluted grooves facing each other are fastened ~o the shaft for each filter plate and that each filter plate is an integral filter element, in whi~h the filter sur-' , faces a~e fastened to the elevations of the frame insuch a way that they form a substantially undetach-able whole and that the filter plates are mounted in place by pushing them at the sector edges into the grooves of two fastening means and by tightening them against the shaft.
The filter alement of the invention is charac-terized in that the frame consists of plate-shaped plastic provided with corrugated recesses and eleva-tions and that the filter surfaces are fastened tothe frame, to the corrugation ribs bearing against the filter surfaces on both sides of the frame, sub-stantially permanently in such a way that the filter surfaces and the frame form an integral filter ele-ment to be replaced as a whole.
The substantial idea of ~he invention is that afilter element to be replaced as a whole has been formed by fastening the filter surfaces, i.e. a fil-ter cloth or a filtering mesh, to the corrugation ribs of a corrugated frame portion formed of a plas-tic plate in such a way that they adhere to each other permanently and thus form a stiff filter ele-ment to be replaced as a whole. The narrow end of a sector of the filter element has an opening for re-~25 moving the water flowing through filtrate channels ; formed by the corrugations. The filter is provided with fluted grooves, into which the filter element is pushed so that its edges remain inside the grooves.
When tightening the element in the pushing direction : 30 by means of a tightening means, a gasket around a water outlet or outlets is pressed around the open-!ings leading to the outlet channels of the filter shaft and seals them. A filter element like this is simple and easy and cheap to manufacture, because it can be made by a simple compression-moulding press, .~ ~
.':, ,~ ., . . :
-~? J~
and because no machining of metal and no expensive metal are needed, as the case is at the manufacture :-o~ prior art filter element frames. Further, the fil-ter surfaces, such as a filter cloth or a filtering mesh, of the filter elemen-t can be fastened simply to the corrugated filter element, for instance by hot welding, glueing or in some other suitable manner, whereby the filtering mesh or the filter cloth stif-fens the corrugated plate and prevents it from bend-ing, because it is supported on both sides of theplate, respectively. When such a filter element is used, a replacement can be carried out very quickly, because it is sufficient to detach the tightening means, to take away the used filter element and to position a new filter element in its place immediate-ly. The consequence is that detrimental breaks in the process remain rather short and extra detaching and mounting are avoided, because it is not necessary to detach the frame of the filter element separately and to fasten it to the filter. Even if the filter ele-ment realized in this way is somewhat more expensive than a filter bag or the like alone, the total costs are considerably less than in the present solutions, considering the savings of working time and a reduced loss of process.
The invention is explained in greater detail in the enclosed drawings, in which Figure 1 shows a filter according to the in~en-tion schematically and a junction between a throat portion and the disc filter, partly in section, Figure la shows a cross-section o~ a place de-signated L-L in Figure 1, Figure 2 shows a filter element according to the invention schematically and partly in section, and ,, `:
Figures 3a to 3d show cross-sections of the filter element of Figure 2 designated A-A to ~-D.
Figure 1 shows a part of a disc filter, com-prising a rotating cylindrical shaft 1 and a plurali-ty of sector-shaped filter plates, filter elements 2, mounted rotatably around the shaft. Between a filter element 2 and the shaft 1 there is a throat portion 3 fastened to the shaft 1. Fluted fastening means 4 ex-tend from the junction of two adjoining throat por-tions 3 along an edge of the sector-shaped filter element 2 and are on both sides provided with a flut-ed groove for mounting the filter element 2 in place.
Such a fastening means 4 is situated at each junction of throat portions in such a way that a filter ele-ment 2 can be mounted at each throat portion 3 sothat each of the transversally opposite edges of the filter element 2 takes its place in the groove and keeps the filter element 2 in place. The narrower end of the sector of the fil~er element 2 further com-prises a gasket 5 bearing against the edges of thethroat portion 3 and sealing an outlet of water chan-nels or filtrate channels formed between the corruga-tion ribs and valleys inside the filter element and an outlet inside the throat portion 3 together. The broader end of the filter element 2 comprises a fas-tening iron 6 extending from edge to edge of the fil-ter element and being at i~s ends fastened to the fastening means 4 by a press plate 7 and a nut or a bolt 8 in such a way that the fastening iron ~ pushes the filter element 2 towards the shaft 1 and presses the gasket 5 between the throat portion 3 and the ; filter element 2.
Figure la shows schematically a cross-section of the fastening means 4 and how adjoining filter elements 2 are positioned in the fastening means 4.
.
,: ,: . - ,:
, : ~ ~'. : ; :
From Figure la is seen how the fastening means 4 is an H-shaped profile, for instance, provided with re-spective grooves on both sides thereof. On the other hand, filter elements 2a and 2b are at their edges pushed into the ~rooves and then kept in place by the edges of the groove and thus they sta~ motionless and stable by the aid of the fastening means 4. The fas-tening means 4 can be an H-shaped integral piece, but it can also be manufactured of two U-shaped parts or it can be some other part shaped and assembled similarly, if it is only provided with a groove for the edge of the filter element 2.
Figure 2 shows the filter element 2 according to the invention. The filter element 2 is a corrugat-ed plate forming a frame 9 provided with parallelcorrugations in the direction of a sector edge, which plate is made of plastic, as polypropylene or some other corresponding plastic material, typically by pressing the straight plate exposed to heat between mould pieces. A water guide groove 10 is mounted at the other edge of the frame 9, in which the corruga-tions end, into which groove the water flows from the filtrate channels formed by the corrugations and along which it flows forward into the lower part of the filter element 2, i.e. through the openings of the gasket 5 of the outlet end into the water outlet channel of the throat portion shown in Figure 1 and from there onwards. On the frame ~ and the water guide groove 10 of the filter element 2 is mounted a filter surface 11, which can consist of a filter cloth manufactured of a plas~ic material or of a me~allic filtering mesh. This filter surface is fas-~tened to the frame 9 and to the water guide groove 10 ;for instance by pressing it against the frame and the ~35 groove and by heating both the filter surface and the ;
, .
corrugation ribs of the frame in such a way that theyadhere to each other. The fastening can take place in such a manner that the filter surface adheres to the corrugation ribs situated on its side either over the whole length of the ribs, or alternatively, only at suitable distances defined in advance, but still in such a way that it is fastened to the frame 9 perma-nently and the rame 9 and the filter surfaces on both sides thereof form an integral whole, i.e. an integral whole filter element, the parts of which cannot be separated from each other in practice. Ad-ditionally, the filter element can comprise a rein-forcement 12 mounted on the frame 9 to reduce a buck-ling around its longitudinal shaft. There can be sev-eral such reinforcements 12 or the filter element canbe made entirely without reinforcements. The reinfor-cement 12 can either consist of the same material as the frame or of a material di~ferent from that of the frame and it can consist of plastic or metal, respec-tively, according to the need of use and the forcesaffecting the filter element. Figur~s 3a to 3d show cross-sections along lines A-A to D-D designated in Figure 2 as an example of an embodiment of the invention. Figure 3a shows a cross-section along line A-A in a situation in which the filter surfaces 11 are normally in place. It shows how the cross-section of the frame 9 is corru-gated in such a way that the outermost corrugation in the preferable embodiment turns subs~antially verti-cally to the filter surfaces 11. The filter surfaces11 situated on both sides of the filter element 2 are fastened to the corrugation ribs of the corrugated frame 9 at points 13 by heating the filter surface 11 and the corruga-tion rib b~ pressing them simultane-ously against each other, after which the junction , , ~
- ~, , , ,. .-, , ; . ~ ' -2~ b/~
formed is allowed to cool off.
Figure 3b shows a cross-section of the other edge of the filter element along line B-B presented in Figure 2, and from Figure 3b is seen how the flow guide 10 is mounted at the edge of the frame 9 in suoh a way that a channel lOa is formed inside it.
Correspondingly, the filter surfaces 11 are fastened to the corrugation ribs 13 of the frame 9 and also, if necessary, to the flow guide 10 at point 13a. The flow guide 10 again is fastened to the corrugated frame 9 consisting of a plate in such a way that the distance betweén the corrugation ribs of the frame 9 and the outermost surfaces of the U-shaped flow guide 10 is substantially the same.
Figure 3c shows a cross-section along line C-C
designated in Figure 2 in the longitudinal direct~on of the filter element parallelly with the corruga-tions thereof. It shows how the filter surfaces 11 are fastened to the corru~ation ribs at fixed dis-tances at the same time as they are turned over the upper edge of the filter element preferably to sur-round it so that a closed filter surface is formed without a necessity of securing the filter surface 11 at the edges along the whole length of the edge por-tion by means o continuous fastening.
A cross-section along line D-D designated in Figure 2 is seen from Figure 3d showing how the rein-forcements 12 are mounted to the frame 9 o the fil-; ter element 2. The reinforcements 12 have such a thickness that they can be fastened to the frame 9, if necessary, for instance by hot welding or in an-other similar manner in such a way that they sink substantially to the level of the corrugation ribs of the frame 9 and do not substantially project from tha rest of the surface. It is then easy to fasten the , ~ ' . ;
filter surfaces 11 to the frame 9 of the filter ele-ment in the manners presented.
The invention has been described above and in the drawings only by way of example and it is in no way restricted to it. Instead with continuous paral-lel corrugations, the frame can be manufactured in such a way that the corrugations run for instance radially and continuously from the broader end of the filter element to its narrower end. Excluding the narrower outlet end, the edges of the filter element can be formed at the same time as the filter element is formed anyway, by pi-essing it in a heated state between the moulds, and then, separate flow guides as shown in the figure are not necessarily needed. At the other edges of the element, except for its nar-rower outlet end, it is possible to mount flow guides serving as support in such a way that they circle from the other edge of the outlet end of the element around its broader end and back again to the other edge of the outlet end. Instead of continuous corru-gations, various interrupted perforated and united corrugations can be used to facilitate and simplify the water flow. The filter surfaces 11 can consist of a metallic filtering mesh, which is pressed and fas-tened by heating to the outermost parts of the sur-face of the frame portion ei~her over the whole length thereof or only over a par~ of their length, for instance a~ points defined at fixed distances.
Metallic filtering meshes can as well be fastened by glueiny along the continuous surface portions of the whole frame portion and the metallic mesh or at suit-able distances by means of a small amount of glue.
Moreover, the filter surface 11 can consist of a fil-ter cloth, which is similarly fastened to the frame portion along the surfaces being in continuous con-: :
tact with the corrugation ribs either over the whole length of the corrugation ribs bearing against the filter cloth or at suitable distances only. If made of a filter cloth, the filter surface can be caused to turn around one edge of the filter element, in which case it forms a continuous filter surface and due to this, mesh is not needed for the whole length of the surface. Respectively, the edges of the filter cloth can in this case be turned on each other at one end of the filter element and fastened to the edge, as can be done also at the broader sector-shaped end of the filter element. The gasket of the filter ele-ment can in both cases be fastened to the outlet end of the filter element by glueing, hot welding etc.
Instead of glueing and hot welding, ultrasonia weld-ing or some other suitable method can be used for fastening the filter surface as well as the gasket.
The gasket can, of course, be ~ounted as loose and it can, in principle, also be fastened to the edge of the outlet channel facing the outlets of the filter element, but it is more reliable and secure in prac-tice to replace the gasket at the same time as the filter element is replaced.
.
Disc filter and filter element for disc filter The invention relates to a disc filter for fil-tering water from a suspension, which filter has a shaft and a plurality of sector-shaped filter plates mounted discoidally around the shaft, each plate com-prising a frame of a plate-shaped material provided with recesses and elevations, the recesses and ele-vations of which frame form between themselves fil-trate channels for removing the filtered waterthrough one outlet or several outlets at the narrower end of the filter plate inside the shaft, and filter surfaces mounted on the frame on ~oth sides thereof, through which surfaces the water to be filtered is able to flow into the filtrate channels.
The invention relates further to a filter ele-ment for a disc filter for the separation of water from a suspension, which filter element has a sector-shaped frame of a plate-shaped material provided with recesses and elevations, the recesses and elevations of which frame form between themselves filtrate chan-nels for removing the filtered water through one out-let or several outlets at the narrower end of the filter plate, and a filter surface mounted on the frame on both sides thereof, through which surface the water is able to flow through the filtrate chan-nels to the outlet end of the filter elPment.
Different kinds of disc filters are used in the paper and mining industry for filtering water from a pulp mixture or a suspension including metal and min-eral particles either to separate the water from these materials or to concentrate the suspension.
Such a filter comprises several filter elements, i.e.
filter plates, typically with a steady frame of met-al, on which is fastened a separate filter surface, , '' ~ , , .
' ~ ~:
z~
such as a filter bag or the like. The filter bag ismounted on the frame and fastened and tightened to it in different ways, whereby the water is able to get through ~he filter surface and flow through the chan-nels of the frame to outlets on one side of the frameand further through the outlets out. The disc filters comprise sector-shaped filter elements fastened around the cylindrical shat to form an integral cir-cumference, several such filter discs axially after each other.
The filter bag and filter surfaces of prior art filter elements wear and get damaged evPry now and then so that they must be replaced by new ones. For this, the filter element is detached from the filter and the filter surface, such as a filter bag, mounted thereon is removed, after which a new filter bag is positioned on it and the element is mounted back to its place. It is rather wearisome to detach the ele-ment and to fasten and tighten it in place and if the filters cGmprise several elements and several rows of discs, a long time is needed for one replacement of the filter elements. It also takes time to remove the filter bags and to mount new ones, and therefore, a replacement of the filter surfaces of the filter ele-ments is rather expensive and time-consuming. In ad-dition to this, costs are caused due to the fact that the process stands still or because the production during replacement is not as effective as at normal operation.
Several different models of filter elements have been manufactur~d, one of which is known from Finnish Patent Application 883061. It describes a filter element consisting of two perforated and grooved plates mounted at a distance from each other, between which plates remains a channel for a liquid .
.:
; ,, ~ ~-:, to flow through the perforations. Ona edge of the element has outlets for removing the liquid and the filter surfaces of this filter element cGnsist of a filter bag, which is mounted on the frame and shrunk by means of heat treatment to lie tightly on it.
On the other hand, Finnish Patent 73141 and U.S. Patent 3,948,779 disclose a solution in which the frame of the filter element consists of a corru-gated plate of metal or the llke. Also in this solu-tion, the filter surfaces are formed by mounting afilter bag on the frame consisting o~ corrugated plate and by tightening it in place by means of heat treatment. A drawback of the prior art element struc-tures is that the frame of the filter element must be detached from the filter in order that the filter surface, i.e. the filter bag, could be replaced, by detaching at first the former and by mounting a new one after that. Moreover, after the new filter bag has been mounted the elements are fastened to the disc filter by securing its frame by means of bolts and nuts. This is difficult and time-consuming, and such a filter element is also heavy and difficult to handle.
The object of this invention is to provide such a disc filter and also such a filter element for the filter by means of which the filter elements are simply and easily mounted and the mounting can take place quickly in such a way that a replacement of the filter elements as a whole will be simpler and cheap-er than according to prior art solutions. The discfilter of the invention is characterized in that elongated fastening means provided with fluted grooves facing each other are fastened ~o the shaft for each filter plate and that each filter plate is an integral filter element, in whi~h the filter sur-' , faces a~e fastened to the elevations of the frame insuch a way that they form a substantially undetach-able whole and that the filter plates are mounted in place by pushing them at the sector edges into the grooves of two fastening means and by tightening them against the shaft.
The filter alement of the invention is charac-terized in that the frame consists of plate-shaped plastic provided with corrugated recesses and eleva-tions and that the filter surfaces are fastened tothe frame, to the corrugation ribs bearing against the filter surfaces on both sides of the frame, sub-stantially permanently in such a way that the filter surfaces and the frame form an integral filter ele-ment to be replaced as a whole.
The substantial idea of ~he invention is that afilter element to be replaced as a whole has been formed by fastening the filter surfaces, i.e. a fil-ter cloth or a filtering mesh, to the corrugation ribs of a corrugated frame portion formed of a plas-tic plate in such a way that they adhere to each other permanently and thus form a stiff filter ele-ment to be replaced as a whole. The narrow end of a sector of the filter element has an opening for re-~25 moving the water flowing through filtrate channels ; formed by the corrugations. The filter is provided with fluted grooves, into which the filter element is pushed so that its edges remain inside the grooves.
When tightening the element in the pushing direction : 30 by means of a tightening means, a gasket around a water outlet or outlets is pressed around the open-!ings leading to the outlet channels of the filter shaft and seals them. A filter element like this is simple and easy and cheap to manufacture, because it can be made by a simple compression-moulding press, .~ ~
.':, ,~ ., . . :
-~? J~
and because no machining of metal and no expensive metal are needed, as the case is at the manufacture :-o~ prior art filter element frames. Further, the fil-ter surfaces, such as a filter cloth or a filtering mesh, of the filter elemen-t can be fastened simply to the corrugated filter element, for instance by hot welding, glueing or in some other suitable manner, whereby the filtering mesh or the filter cloth stif-fens the corrugated plate and prevents it from bend-ing, because it is supported on both sides of theplate, respectively. When such a filter element is used, a replacement can be carried out very quickly, because it is sufficient to detach the tightening means, to take away the used filter element and to position a new filter element in its place immediate-ly. The consequence is that detrimental breaks in the process remain rather short and extra detaching and mounting are avoided, because it is not necessary to detach the frame of the filter element separately and to fasten it to the filter. Even if the filter ele-ment realized in this way is somewhat more expensive than a filter bag or the like alone, the total costs are considerably less than in the present solutions, considering the savings of working time and a reduced loss of process.
The invention is explained in greater detail in the enclosed drawings, in which Figure 1 shows a filter according to the in~en-tion schematically and a junction between a throat portion and the disc filter, partly in section, Figure la shows a cross-section o~ a place de-signated L-L in Figure 1, Figure 2 shows a filter element according to the invention schematically and partly in section, and ,, `:
Figures 3a to 3d show cross-sections of the filter element of Figure 2 designated A-A to ~-D.
Figure 1 shows a part of a disc filter, com-prising a rotating cylindrical shaft 1 and a plurali-ty of sector-shaped filter plates, filter elements 2, mounted rotatably around the shaft. Between a filter element 2 and the shaft 1 there is a throat portion 3 fastened to the shaft 1. Fluted fastening means 4 ex-tend from the junction of two adjoining throat por-tions 3 along an edge of the sector-shaped filter element 2 and are on both sides provided with a flut-ed groove for mounting the filter element 2 in place.
Such a fastening means 4 is situated at each junction of throat portions in such a way that a filter ele-ment 2 can be mounted at each throat portion 3 sothat each of the transversally opposite edges of the filter element 2 takes its place in the groove and keeps the filter element 2 in place. The narrower end of the sector of the fil~er element 2 further com-prises a gasket 5 bearing against the edges of thethroat portion 3 and sealing an outlet of water chan-nels or filtrate channels formed between the corruga-tion ribs and valleys inside the filter element and an outlet inside the throat portion 3 together. The broader end of the filter element 2 comprises a fas-tening iron 6 extending from edge to edge of the fil-ter element and being at i~s ends fastened to the fastening means 4 by a press plate 7 and a nut or a bolt 8 in such a way that the fastening iron ~ pushes the filter element 2 towards the shaft 1 and presses the gasket 5 between the throat portion 3 and the ; filter element 2.
Figure la shows schematically a cross-section of the fastening means 4 and how adjoining filter elements 2 are positioned in the fastening means 4.
.
,: ,: . - ,:
, : ~ ~'. : ; :
From Figure la is seen how the fastening means 4 is an H-shaped profile, for instance, provided with re-spective grooves on both sides thereof. On the other hand, filter elements 2a and 2b are at their edges pushed into the ~rooves and then kept in place by the edges of the groove and thus they sta~ motionless and stable by the aid of the fastening means 4. The fas-tening means 4 can be an H-shaped integral piece, but it can also be manufactured of two U-shaped parts or it can be some other part shaped and assembled similarly, if it is only provided with a groove for the edge of the filter element 2.
Figure 2 shows the filter element 2 according to the invention. The filter element 2 is a corrugat-ed plate forming a frame 9 provided with parallelcorrugations in the direction of a sector edge, which plate is made of plastic, as polypropylene or some other corresponding plastic material, typically by pressing the straight plate exposed to heat between mould pieces. A water guide groove 10 is mounted at the other edge of the frame 9, in which the corruga-tions end, into which groove the water flows from the filtrate channels formed by the corrugations and along which it flows forward into the lower part of the filter element 2, i.e. through the openings of the gasket 5 of the outlet end into the water outlet channel of the throat portion shown in Figure 1 and from there onwards. On the frame ~ and the water guide groove 10 of the filter element 2 is mounted a filter surface 11, which can consist of a filter cloth manufactured of a plas~ic material or of a me~allic filtering mesh. This filter surface is fas-~tened to the frame 9 and to the water guide groove 10 ;for instance by pressing it against the frame and the ~35 groove and by heating both the filter surface and the ;
, .
corrugation ribs of the frame in such a way that theyadhere to each other. The fastening can take place in such a manner that the filter surface adheres to the corrugation ribs situated on its side either over the whole length of the ribs, or alternatively, only at suitable distances defined in advance, but still in such a way that it is fastened to the frame 9 perma-nently and the rame 9 and the filter surfaces on both sides thereof form an integral whole, i.e. an integral whole filter element, the parts of which cannot be separated from each other in practice. Ad-ditionally, the filter element can comprise a rein-forcement 12 mounted on the frame 9 to reduce a buck-ling around its longitudinal shaft. There can be sev-eral such reinforcements 12 or the filter element canbe made entirely without reinforcements. The reinfor-cement 12 can either consist of the same material as the frame or of a material di~ferent from that of the frame and it can consist of plastic or metal, respec-tively, according to the need of use and the forcesaffecting the filter element. Figur~s 3a to 3d show cross-sections along lines A-A to D-D designated in Figure 2 as an example of an embodiment of the invention. Figure 3a shows a cross-section along line A-A in a situation in which the filter surfaces 11 are normally in place. It shows how the cross-section of the frame 9 is corru-gated in such a way that the outermost corrugation in the preferable embodiment turns subs~antially verti-cally to the filter surfaces 11. The filter surfaces11 situated on both sides of the filter element 2 are fastened to the corrugation ribs of the corrugated frame 9 at points 13 by heating the filter surface 11 and the corruga-tion rib b~ pressing them simultane-ously against each other, after which the junction , , ~
- ~, , , ,. .-, , ; . ~ ' -2~ b/~
formed is allowed to cool off.
Figure 3b shows a cross-section of the other edge of the filter element along line B-B presented in Figure 2, and from Figure 3b is seen how the flow guide 10 is mounted at the edge of the frame 9 in suoh a way that a channel lOa is formed inside it.
Correspondingly, the filter surfaces 11 are fastened to the corrugation ribs 13 of the frame 9 and also, if necessary, to the flow guide 10 at point 13a. The flow guide 10 again is fastened to the corrugated frame 9 consisting of a plate in such a way that the distance betweén the corrugation ribs of the frame 9 and the outermost surfaces of the U-shaped flow guide 10 is substantially the same.
Figure 3c shows a cross-section along line C-C
designated in Figure 2 in the longitudinal direct~on of the filter element parallelly with the corruga-tions thereof. It shows how the filter surfaces 11 are fastened to the corru~ation ribs at fixed dis-tances at the same time as they are turned over the upper edge of the filter element preferably to sur-round it so that a closed filter surface is formed without a necessity of securing the filter surface 11 at the edges along the whole length of the edge por-tion by means o continuous fastening.
A cross-section along line D-D designated in Figure 2 is seen from Figure 3d showing how the rein-forcements 12 are mounted to the frame 9 o the fil-; ter element 2. The reinforcements 12 have such a thickness that they can be fastened to the frame 9, if necessary, for instance by hot welding or in an-other similar manner in such a way that they sink substantially to the level of the corrugation ribs of the frame 9 and do not substantially project from tha rest of the surface. It is then easy to fasten the , ~ ' . ;
filter surfaces 11 to the frame 9 of the filter ele-ment in the manners presented.
The invention has been described above and in the drawings only by way of example and it is in no way restricted to it. Instead with continuous paral-lel corrugations, the frame can be manufactured in such a way that the corrugations run for instance radially and continuously from the broader end of the filter element to its narrower end. Excluding the narrower outlet end, the edges of the filter element can be formed at the same time as the filter element is formed anyway, by pi-essing it in a heated state between the moulds, and then, separate flow guides as shown in the figure are not necessarily needed. At the other edges of the element, except for its nar-rower outlet end, it is possible to mount flow guides serving as support in such a way that they circle from the other edge of the outlet end of the element around its broader end and back again to the other edge of the outlet end. Instead of continuous corru-gations, various interrupted perforated and united corrugations can be used to facilitate and simplify the water flow. The filter surfaces 11 can consist of a metallic filtering mesh, which is pressed and fas-tened by heating to the outermost parts of the sur-face of the frame portion ei~her over the whole length thereof or only over a par~ of their length, for instance a~ points defined at fixed distances.
Metallic filtering meshes can as well be fastened by glueiny along the continuous surface portions of the whole frame portion and the metallic mesh or at suit-able distances by means of a small amount of glue.
Moreover, the filter surface 11 can consist of a fil-ter cloth, which is similarly fastened to the frame portion along the surfaces being in continuous con-: :
tact with the corrugation ribs either over the whole length of the corrugation ribs bearing against the filter cloth or at suitable distances only. If made of a filter cloth, the filter surface can be caused to turn around one edge of the filter element, in which case it forms a continuous filter surface and due to this, mesh is not needed for the whole length of the surface. Respectively, the edges of the filter cloth can in this case be turned on each other at one end of the filter element and fastened to the edge, as can be done also at the broader sector-shaped end of the filter element. The gasket of the filter ele-ment can in both cases be fastened to the outlet end of the filter element by glueing, hot welding etc.
Instead of glueing and hot welding, ultrasonia weld-ing or some other suitable method can be used for fastening the filter surface as well as the gasket.
The gasket can, of course, be ~ounted as loose and it can, in principle, also be fastened to the edge of the outlet channel facing the outlets of the filter element, but it is more reliable and secure in prac-tice to replace the gasket at the same time as the filter element is replaced.
.
Claims (16)
1. A disc filter for filtering water from a suspension, which filter has a shaft (1) and a plura-lity of sector-shaped filter plates (2) mounted dis-coidally around it, each plate comprising a frame (9) of a plate-shaped material provided with recesses and elevations, the recesses and elevations of which frame form between themselves filtrate channels for removing the filtered water through one outlet or several outlets at the narrower end of the filter plate (2) inside the shaft (1), and filter surfaces (11) mounted on the frame (2) on both sides thereof, through which surfaces the water to be filtered is able to flow into the filtrate channels, c h a r -a c t e r i z e d in that elongated fastening means (4) provided with fluted grooves facing each other are fastened to the shaft (1) for each filter plate (2) and that each filter plate (2) is an integral filter element, in which the filter surfaces (11) are fastened to the elevations of the frame (9) in such a way that they form a substantially undetachable whole and that the filter plates (2) are mounted in place by pushing them at the sector edges into the grooves of two fastening means (4) and by tightening them against the shaft (1).
2. A disc filter according to claim 1, c h a r-a c t e r i z e d in that it comprises a throat por-tion (3) fastened to the shaft (1) for each filter plate (2), through which throat portion a drainage channel runs into the shaft (1) and that the fasten-ing means (4) are mounted between adjoining throat portions and that each fastening means (4) is pro-vided with a longitudinal groove in the direction of each adjacent throat portion (3) for mounting the filter element (2) and that between the outlet end of the filter element (2) facing the throat portion (3) and the edge of the throat portion (3) there is a gasket means (5) sealing the outlet end of the filter element (2) to the outlet channel of the throat por-tion (3) and that it comprises tightening means (6 to 8) connected to the fastening means (4) for tighten-ing the outlet end of the filter elements (2) closely to the throat portion (3).
3. A filter element for a disc filter for the separation of water from a suspension, which filter element (2) has a sector-shaped frame (9) of a plate-shaped material provided with recesses and eleva-tions, the recesses and elevations of which frame form between themselves filtrate channels for remov-ing the filtered water through one outlet or several outlets at the narrower end of the filter element (2) and a filter surface (11) mounted on the frame on both sides thereof, through which surface the water is able to flow through the filtrate channels to the outlet end of the filter element (2), c h a r a c -t e r i z e d in that the frame (9) consists of plate-shaped plastic provided with corrugated reces-ses and elevations and that the filter surfaces (11) are fastened to the frame (9), to the corrugation ribs bearing against the filter surfaces (11) on both sides of the frame, substantially permanently in such a way that the filter surfaces (11) and the frame (9) form an integral filter element (2) to be replaced as a whole.
4. A filter element according to claim 3, c h a r a c t e r i z e d in that the filter sur-faces (11) are fastened to the frame (9) substantial-ly over that part of the length of the corrugation ribs along which they bear against the filter sur-faces (11).
5. A filter element according to claim 3, c h a r a c t e r i z e d in that the filter sur-faces (11) are fastened to the corrugation ribs of the frame (9) at suitable distances defined in ad-vance.
6. A filter element according to one of the claims 3 to 5, c h a r a c t e r i z e d in that at least a part of the corrugations of the frame (9) are formed to corrugations parallel with one edge of a sector and each other.
7. A filter element according to claim 6, c h a r a c t e r i z e d in that all corrugations of the frame (9) are formed to corrugations parallel with one edge of the sector and that at the other edge of the frame (9) is mounted a separate water guide groove (10) leading the water flowing through the corrugations ending in said edge to the outlet end of the filter element (2).
8. A filter element according to one of the claims 3 to 5, c h a r a c t e r i z e d in that the corrugations of the frame (9) are formed to cor-rugations in the longitudinal direction of the sector and that at each edge of the frame (9) is mounted a separate water guide groove (10) loading the water flowing through the corrugations ending in the edge to the outlet end of the filter element (2).
9. A filter element according to one of the claims 3 to 5, c h a r a c t e r i z e d in that at least a part of the corrugations of the frame (9) are formed to corrugations parallel with the radius of the sector.
10. A filter element according to one of the claims 3 to 9, c h 8 r a c t e r i z e d in that the corrugations of the frame (9) are formed to con-tinuous corrugations.
11. A filter element according to one of the claims 3 to 10, c h a r a c t e R I z e d in that the filter surfaces (11) consist of a filter cloth.
12. A filter element according to one of the claims 3 to 10, c h a r a c t e r i z e d in that the filter surfaces (11) consist of a metallic mesh.
13. A filter element according to one of the claims 3 to 12, c h a r a c t e r i z e d in that the filter surfaces (11) are fastened to the frame (9) by hot welding.
14. A filter element according to one of the claims 3 to 12, c h a r a c t e r i z e d in that the filter surfaces (11) are fastened to the frame (9) by glueing.
15. A filter element according to one of the claims 3 to 14, c h a r a c t e r i z e d in that at the edges of the filter element (2) the filter surfaces (11) are turned on the edge of the frame-(9).
16. A filter element according to one the claims 3 to 15, c h a r a c t e r i z e d in that the gasket (5) is fastened to the outlet end of the filter element (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI912760 | 1991-06-07 | ||
| FI912760A FI912760A (en) | 1991-06-07 | 1991-06-07 | SKIVFILTER OCH FILTERELEMENT FOER SKIVFILTER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2070341A1 true CA2070341A1 (en) | 1992-12-08 |
Family
ID=8532667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2070341 Abandoned CA2070341A1 (en) | 1991-06-07 | 1992-06-03 | Disc filter and filter element for disc filter |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU1801492A (en) |
| CA (1) | CA2070341A1 (en) |
| DE (1) | DE4218217A1 (en) |
| FI (1) | FI912760A (en) |
| FR (1) | FR2677266A1 (en) |
| SE (1) | SE9201742L (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009105015A1 (en) | 2008-02-22 | 2009-08-27 | Nordic Water Products Ab | Filter element for a disc filter |
| CN103917281A (en) * | 2011-08-29 | 2014-07-09 | 奥维沃卢森堡公司 | A filter segment with a light weight frame |
| US8801929B2 (en) | 2007-07-18 | 2014-08-12 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US8808542B2 (en) | 2007-07-18 | 2014-08-19 | Evoqua Water Technologies Llc | Disc filter |
| EP2857081A2 (en) | 2013-09-30 | 2015-04-08 | IN - EKO Team s.r.o. | Disc filter |
| US9028692B2 (en) | 2006-08-14 | 2015-05-12 | Evoqua Water Technologies Llc | High flow disc filter |
| US9669338B2 (en) * | 2015-03-11 | 2017-06-06 | GL & V Luxembourg Sàrl | Disc filter and a method of constructing a disc filter sector |
| US10857491B2 (en) | 2014-06-05 | 2020-12-08 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US10888807B2 (en) | 2016-08-12 | 2021-01-12 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE501367C2 (en) * | 1993-02-18 | 1995-01-23 | Celleco Hedemora Ab | Device for filtering liquids |
| AT401355B (en) * | 1994-09-08 | 1996-08-26 | Andritz Patentverwaltung | DISC FILTERS FOR SEPARATING LIQUIDS FROM A SUSPENSION, IN PARTICULAR FIBER FIBER SUSPENSION |
| DE19804494C2 (en) * | 1998-02-05 | 2002-02-07 | Schenk Filterbau Gmbh | Filter element for horizontal disc filters |
| EA005787B1 (en) * | 2002-03-01 | 2005-06-30 | Закрытое акционерное общество Научно-технический центр "Бакор" | Ceramic filtering element and method for production thereof |
| AT412259B (en) * | 2003-06-04 | 2004-12-27 | Andritz Ag Maschf | METHOD FOR PRODUCING A SECTOR-SHAPED FILTER ELEMENT AND FILTER ELEMENT |
| US7314556B2 (en) * | 2003-12-05 | 2008-01-01 | Andritz Inc. | Filter disc with panel sectors |
| AT503524B1 (en) * | 2006-05-09 | 2008-05-15 | Andritz Ag Maschf | DISC FILTERS AND DISC FILTER SECTORS |
| SE533771C2 (en) * | 2009-05-06 | 2010-12-28 | Hydrotech Veolia Water Systems Ab | Module for the construction of disc filters |
| AT13141U1 (en) * | 2011-05-27 | 2013-07-15 | Metso Paper Inc | Outlet for a disc filter |
| CN103120869A (en) * | 2011-11-18 | 2013-05-29 | 可隆水科技(株) | Filtering membrane assembly body and disc filter comprising same |
| DE102012222400A1 (en) | 2012-12-06 | 2014-06-26 | BSH Bosch und Siemens Hausgeräte GmbH | Disk filter plate for filter system for filtering intake air of base supporting device, has disk-shaped carrier element and one or multiple filter material elements, which flow at two or multiple surfaces of carrier element |
| WO2016162590A1 (en) * | 2015-04-09 | 2016-10-13 | Minexcell Oy | Filter plate |
| RU2611524C1 (en) * | 2015-11-09 | 2017-02-27 | Закрытое акционерное общество "Научно-технический центр "Бакор" | Sector element of disk filter |
| DE102016219235A1 (en) * | 2016-10-05 | 2018-04-05 | Voith Patent Gmbh | filter element |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE679064A (en) * | 1966-04-05 | 1966-09-16 | ||
| DE2455967A1 (en) * | 1974-11-27 | 1976-06-10 | Vowinckel Fa Joh J | Filter segment for disc filters - having polypropylene or similar corrosion resistant filter support element |
| SE432715B (en) * | 1983-02-10 | 1984-04-16 | Hedemora Verkstaeder Ab | ROTATING DISC FILTER |
-
1991
- 1991-06-07 FI FI912760A patent/FI912760A/en not_active Application Discontinuation
-
1992
- 1992-06-03 DE DE19924218217 patent/DE4218217A1/en not_active Withdrawn
- 1992-06-03 CA CA 2070341 patent/CA2070341A1/en not_active Abandoned
- 1992-06-05 AU AU18014/92A patent/AU1801492A/en not_active Abandoned
- 1992-06-05 SE SE9201742A patent/SE9201742L/en not_active Application Discontinuation
- 1992-06-05 FR FR9206879A patent/FR2677266A1/en active Pending
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| US10207210B2 (en) | 2006-08-14 | 2019-02-19 | Evoqua Water Technologies Llc | High flow disc filter |
| US9028692B2 (en) | 2006-08-14 | 2015-05-12 | Evoqua Water Technologies Llc | High flow disc filter |
| US9339745B2 (en) | 2007-07-18 | 2016-05-17 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US8801929B2 (en) | 2007-07-18 | 2014-08-12 | Evoqua Water Technologies Llc | Trash tolerant filter support for a disc filter |
| US8808542B2 (en) | 2007-07-18 | 2014-08-19 | Evoqua Water Technologies Llc | Disc filter |
| US9023208B2 (en) | 2007-07-18 | 2015-05-05 | Evoqua Water Technologies Llc | Disc filter |
| CN101998875A (en) * | 2008-02-22 | 2011-03-30 | 瑞典诺迪克有限公司 | Filter element for a disc filter |
| RU2467785C2 (en) * | 2008-02-22 | 2012-11-27 | Нордик Вотер Продактс Аб | Disc filter filtration element |
| CN101998875B (en) * | 2008-02-22 | 2013-09-11 | 瑞典诺迪克有限公司 | Filter element for a disc filter |
| WO2009105015A1 (en) | 2008-02-22 | 2009-08-27 | Nordic Water Products Ab | Filter element for a disc filter |
| US8852434B2 (en) | 2008-02-22 | 2014-10-07 | Nordic Water Products Ab | Filter element for a disc filter |
| CN103917281A (en) * | 2011-08-29 | 2014-07-09 | 奥维沃卢森堡公司 | A filter segment with a light weight frame |
| CN103917281B (en) * | 2011-08-29 | 2016-02-17 | 奥维沃卢森堡公司 | With the filter sections of lightweight framework |
| EP2857081A2 (en) | 2013-09-30 | 2015-04-08 | IN - EKO Team s.r.o. | Disc filter |
| US10857491B2 (en) | 2014-06-05 | 2020-12-08 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US11660552B2 (en) | 2014-06-05 | 2023-05-30 | Evoqua Water Technologies Llc | Filtering panel and method of making the same |
| US9669338B2 (en) * | 2015-03-11 | 2017-06-06 | GL & V Luxembourg Sàrl | Disc filter and a method of constructing a disc filter sector |
| US10888807B2 (en) | 2016-08-12 | 2021-01-12 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
| US12048890B2 (en) | 2016-08-12 | 2024-07-30 | Evoqua Water Technologies Llc | Disc filter pre-screen dual media disc filter |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9201742D0 (en) | 1992-06-05 |
| FI912760A0 (en) | 1991-06-07 |
| FR2677266A1 (en) | 1992-12-11 |
| SE9201742L (en) | 1992-12-08 |
| AU1801492A (en) | 1992-12-10 |
| DE4218217A1 (en) | 1992-12-10 |
| FI912760A (en) | 1992-12-08 |
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