CA2224924A1 - Filtration system for removing solid particles - Google Patents
Filtration system for removing solid particles Download PDFInfo
- Publication number
- CA2224924A1 CA2224924A1 CA002224924A CA2224924A CA2224924A1 CA 2224924 A1 CA2224924 A1 CA 2224924A1 CA 002224924 A CA002224924 A CA 002224924A CA 2224924 A CA2224924 A CA 2224924A CA 2224924 A1 CA2224924 A1 CA 2224924A1
- Authority
- CA
- Canada
- Prior art keywords
- solid particles
- filtration system
- filtration
- removing solid
- liquids according
- 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
- 238000001914 filtration Methods 0.000 title claims abstract description 121
- 239000007787 solid Substances 0.000 title claims abstract description 35
- 239000002245 particle Substances 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 239000000706 filtrate Substances 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 10
- 239000004744 fabric Substances 0.000 description 26
- 239000012065 filter cake Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/003—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by an elastic bag or diaphragm expanded by fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/127—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands
- B01D25/1275—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands the plates or the frames being placed in a non-vertical position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/172—Plate spreading means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
- B30B9/045—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with several adjacent casings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/22—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using a flexible member, e.g. diaphragm, urged by fluid pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Filtration Of Liquid (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Filtering Materials (AREA)
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Glass Compositions (AREA)
Abstract
The invention concerns a filtration system for removing solid particles from liquids. In the filtration device, flexible sealing elements (3) are provided between the cover plate (1) and filter plate (2) to form a filtration chamber (4), as well as a filter unit (5) between the sealing elements and filter plate. A base plate is located beneath and at a distance from the filter plate. Flexible tubes are arranged between the filter plate and base plate (6) and are connected via a pressure medium to a pressure-generating device. The filter plate can move perpendicularly relative to the longitudinal axis of the cover plate (1).
Description
CA 02224924 l997-l2-l8 Description Filtration System for Removing Solid Particles The invention concerns a filtration system for removing solid particles from liquids using a cover plate and a filtration device adjoining the underside of the cover plate.
Mechanical removal processes and devices are familiar, these ser~ing to separate what are mostly solid particles from liquids or suspensions as well as insoluble droplets of liquid from another liquid or emulsion aided by porous filter units flat in shape such as filter cloths or wire-fabric screen cloths or thick gravel-pack layers. The physical ~riving force as 15 applied to filtration is the difference in pressure between the inlet and outlet ends of the filter brought about by the weight of the liquid column located above the filter. This force can, however, also be generated, or at least boosted, by presses on the inlet side or by applying vacuum on the outlet side (pressure or vacuum filtration).
Using automatic filter presses, for example, an attempt is made to shorten the process of filtration as well as setting-up times spent on replacing or separating the filter cake. In the case of the automatic chamber filter press, which is fitted with horizontal filter chambers located one on top of the other and an endless-belt type filter cloth, the filter plates can be 25 moved up and down by means of an electro-mechanical opening and closing device. During this process the filter cake is separated sideways on the filter cloth. Replacement of a new unreeled filter cloth is effected by laterally mounted roller elements.
30It has been shown on the conventional type of automatic vertical chamber filter press incorporating movable filter plates that evenness of ascent and descent on the filter plates, ' CA 02224924 1997-12-18 controlled by laterally mounted lifting systems mounted on the side of the filter plates, is inadequate, thus resulting in leakages occurring on the filtration chambers acted upon by high pressure. Leakages are to be observed in particular on sealing elements used to seal off the sides of the filtration chambers. Leakages are incapable of being prevented even if 5 equipping the filter chambers with fle~;ible sealing elements as it becomes apparent that the more flexible a seal is, all the higher is the potential fragility of the material and thus all the shorter the service life of the sealing elements is bound to be. Guidance of the endless belt-type filter cloth is likewise oroblematic and involves a complex roller system, in other words a large number of moving parts which are susceptible to disturbance.
The disadvantage of pressure filters designed with rigidly mounted rect~n~ r duct-like filter chambers, whose ports, located opposite, can be closed offwith tube-like seals for the filtration process, is that the filter cloth resting on the perforated base of the chamber 15 develops a corrugated shape through constant use, this resulting in the solid matter seeping through. S-shaped distortion of the filter cloth is also inevitable and causes increased wear along the edges while the cloth is rendering service or leads to the formation of dead filtration zones.
Dead filtration zones are interpreted as being those areas which, despite their being covered over by the filter cloth, do not reveal any pores or inlet for the filtrate.
The disadvantage of chamber filter presses designed with horizontally movable filter plates is that the filter cloths are immobile for the purpose of improving cake discharge or for carrying out efficient cloth washing after each filtration process as a means of protection against blinding.
The term 'blinding' is used to describe clogging of the pores on the filter cloth.
CA 02224924 l997-l2-l8 The chamber filter press disclosed under DE 37 03 696 A1 is provided with two end plates interposed by a set of filter plates around which a closed-loop filter cloth belt runs, this bein, tensioned by means of rollers. These rollers run inside the grooves of gibbets rigidly mounted to the plates. The chamber filter press also reveals a device providing 5 contact pressure for the set of filter plates as well as manifolds lin};ed to the feed and discharge lines of the matter due to be removed. The disadvantage observed here is that, although the load generated by the filter cloth belt while in motion is taken over by the plates, a heavy degree of strain is nevertheless exerted on tensioning elements.
US PS 50 94 760 merely describes a filtration system designed to run on intermittent lines incorporating several vertical filter plates rigidly mounted next to one another and whose interstices are acted upon by matter due to undergo filtration. These interstices are rigidly mounted to two opposite sides and are capable of being locked at the top and 15 bottom with tube-like seals for the process of filtration. In addition, a double-sided diaphragm is installed centrally between the filter plates and can be acted upon by a pressure medium for re-pressing the filter cake formed during the process of filtration. Here, however, due to the inadequate sealing of the filter media against the filter plates on the closed sides of the interstices, solid matter seepage occurs as well as premature blinding of 20 the filter cloth due to single-sided washing.
The object of the invention presented here is not only to eliminate the above-mentioned shortcomings revealed in the current state of the art, but also to create a 25 universal filtration system capable of being constructed and operated at low cost owing to the simplicity of its design and thus having a favourable impact on industrial use for tasks encountered in the sector of environmental protection. In addition, facilities were needed for pressing out the possible formation of a compressible filter cake after filtration of the suspension or liquid.
Mechanical removal processes and devices are familiar, these ser~ing to separate what are mostly solid particles from liquids or suspensions as well as insoluble droplets of liquid from another liquid or emulsion aided by porous filter units flat in shape such as filter cloths or wire-fabric screen cloths or thick gravel-pack layers. The physical ~riving force as 15 applied to filtration is the difference in pressure between the inlet and outlet ends of the filter brought about by the weight of the liquid column located above the filter. This force can, however, also be generated, or at least boosted, by presses on the inlet side or by applying vacuum on the outlet side (pressure or vacuum filtration).
Using automatic filter presses, for example, an attempt is made to shorten the process of filtration as well as setting-up times spent on replacing or separating the filter cake. In the case of the automatic chamber filter press, which is fitted with horizontal filter chambers located one on top of the other and an endless-belt type filter cloth, the filter plates can be 25 moved up and down by means of an electro-mechanical opening and closing device. During this process the filter cake is separated sideways on the filter cloth. Replacement of a new unreeled filter cloth is effected by laterally mounted roller elements.
30It has been shown on the conventional type of automatic vertical chamber filter press incorporating movable filter plates that evenness of ascent and descent on the filter plates, ' CA 02224924 1997-12-18 controlled by laterally mounted lifting systems mounted on the side of the filter plates, is inadequate, thus resulting in leakages occurring on the filtration chambers acted upon by high pressure. Leakages are to be observed in particular on sealing elements used to seal off the sides of the filtration chambers. Leakages are incapable of being prevented even if 5 equipping the filter chambers with fle~;ible sealing elements as it becomes apparent that the more flexible a seal is, all the higher is the potential fragility of the material and thus all the shorter the service life of the sealing elements is bound to be. Guidance of the endless belt-type filter cloth is likewise oroblematic and involves a complex roller system, in other words a large number of moving parts which are susceptible to disturbance.
The disadvantage of pressure filters designed with rigidly mounted rect~n~ r duct-like filter chambers, whose ports, located opposite, can be closed offwith tube-like seals for the filtration process, is that the filter cloth resting on the perforated base of the chamber 15 develops a corrugated shape through constant use, this resulting in the solid matter seeping through. S-shaped distortion of the filter cloth is also inevitable and causes increased wear along the edges while the cloth is rendering service or leads to the formation of dead filtration zones.
Dead filtration zones are interpreted as being those areas which, despite their being covered over by the filter cloth, do not reveal any pores or inlet for the filtrate.
The disadvantage of chamber filter presses designed with horizontally movable filter plates is that the filter cloths are immobile for the purpose of improving cake discharge or for carrying out efficient cloth washing after each filtration process as a means of protection against blinding.
The term 'blinding' is used to describe clogging of the pores on the filter cloth.
CA 02224924 l997-l2-l8 The chamber filter press disclosed under DE 37 03 696 A1 is provided with two end plates interposed by a set of filter plates around which a closed-loop filter cloth belt runs, this bein, tensioned by means of rollers. These rollers run inside the grooves of gibbets rigidly mounted to the plates. The chamber filter press also reveals a device providing 5 contact pressure for the set of filter plates as well as manifolds lin};ed to the feed and discharge lines of the matter due to be removed. The disadvantage observed here is that, although the load generated by the filter cloth belt while in motion is taken over by the plates, a heavy degree of strain is nevertheless exerted on tensioning elements.
US PS 50 94 760 merely describes a filtration system designed to run on intermittent lines incorporating several vertical filter plates rigidly mounted next to one another and whose interstices are acted upon by matter due to undergo filtration. These interstices are rigidly mounted to two opposite sides and are capable of being locked at the top and 15 bottom with tube-like seals for the process of filtration. In addition, a double-sided diaphragm is installed centrally between the filter plates and can be acted upon by a pressure medium for re-pressing the filter cake formed during the process of filtration. Here, however, due to the inadequate sealing of the filter media against the filter plates on the closed sides of the interstices, solid matter seepage occurs as well as premature blinding of 20 the filter cloth due to single-sided washing.
The object of the invention presented here is not only to eliminate the above-mentioned shortcomings revealed in the current state of the art, but also to create a 25 universal filtration system capable of being constructed and operated at low cost owing to the simplicity of its design and thus having a favourable impact on industrial use for tasks encountered in the sector of environmental protection. In addition, facilities were needed for pressing out the possible formation of a compressible filter cake after filtration of the suspension or liquid.
4/19 '' Accordingly it appeared desirable to make provision for a filtration system which, under working conditions, would facilitate ascent and descent of evenly spaced filter plates while pressing the same against the cover plates. Another advantage-would be to cater for higher dehydration of a compressible filter cake by means of an additional pressing process 5 making use of existing equipment so as to dispense with the necessity of employing costly diaphragms used on con- entional-type filtration systems for compressing filter cakes.
It was further deemed necessary to make provision for filtration to proceed on 10 continuous lines, in which case replacement of filter cloths and/or separation of the filter cake might be rendered possible during filtration without disturbing, slowing down or even interrupting the filtration process. Here, it was regarded as being desirable to provide a filtration system that would be easy to handle while enabling a whole variety of different filtration processes to be perforrned without much conversion such as parallel- or series-15 connected filtration methods.
This task is solved by the main claim. The subordinate claims concern preferreddesign versions.
The invention concems a filtration system for removing solid particles from liquids or suspensions and is provided with a cover plate as well as filtration device located on the underside of the cover plate, characterised in that the said filtration device comprises 25 flexible sealing elements and a filter plate, whereby the filter plate, which is aligned so as to run essentially parallel to the cover plate, is capable of being moved perpendicularly relative to the longitudinal axis of the cover plate, further that sealing elements are located between the cover plate and filter plate to form a filtration chamber and a filter unit is located between the sealin~ elements and the filter plate, further that a base plate is located 30 underneath the filter plate at a distance from the filter plate, further that one or more flexible ' CA 02224924 1997-12-18 lifting elements are located between the filter plate and base plate and are connected via as pressure medium to a pressure-generating device.
The filter plate is essentially aligned so as to run parallel to the cover plate owing to some slight deviations in its position likely to occur on account of the flexibility of the sealing elements. The sealing elements are also capable of acting as spacers between the filter plate and cover plate when the filter plate is pressed by the lifting elements against the sealing elements, e.g. while the filtration operation is in progress. Minor differences may occur in the formability or deforrnability of the sealing elements due to the nature of the material from which they made which, however, have had no noticeable effect on restricting the success of the invention.
There is also a likelihood of a slight difference occurring in the position of the filter plate on account of varying deformability of the lifting elements due to the resilience of the material, a circumstance which, however, does not deter from the outstanding success of the invention, especially as facilities are provided for carrying out appropriate adjustments to the position of the filter plate, e.g. by varying pressure using pressure-loadable sealing elements.
For example, plerelled fiexible lifting elements may assume the form of moulded cushions or air cushions usable as large- and/or small-area units. It is also possible to make use of tubes to serve as flexible lifting elements.
A type of tube capable of being used may be designed in such a way for example that, prior to pressure-loading, the circumference of the tube remains essentially unchanged in the cross-sectional area in the relieved state as well as when pressure-loading takes place but ' CA 02224924 1997-12-18 that the shape of the tube cross-sectional area differs before and during pressure-loading.
For example, a fabric-reinforced tube usable as a lifting element re-eals a variable cross-sectional shape in the relieved state but its circumference in the cross-sectional area remains essentially unchanged.
A flexible lifting element may assume the form of a hollow body with resilient walls rnadc of flexible material which increases in diameter in the cross-sectional area when p e.i~ e is applied and which reduces its diameter in the absence of pressure due, for 10 inslance, to the inherent elasticity or internal stress of its material.
The flexible li~ing elements are mounted between the filter plate and base plate in such a way that the flexible lifting elements - due to their deformability when acted upon by 15 pressure - reduce the distance between the cover plate and filter plate when under pressure caused by the filter plate ascending perpendicularly to the longitudinal axis of the cover plate in the direction of the cover plate, i.e. upwards. When pressure is released, the diameter of the flexible lifting elements for example is reduced and the filter plate travels in the direction of the base plate, i.e. downwards. On account of the arrangement of the 20 flexible lifting elements, the filter plate remains essentially aligned parallel to the longitudinal axis of the cover plate during the ascending and descending motions.
It is observed as being an advantage when the diameter of the tubes undergoes change 25 when pressure-loaded and the tubes reveal an approximately identical shape in the cross-sectional area when acted upon by a defined pressure. Owing to the use of tubes, whose shape is capable of undergoing change when acted upon by pressure, the filtration system on which the invention is based caters for even distribution of forces over the filter plate so that ideal running up to the cover plate is rendered possible.
It was further deemed necessary to make provision for filtration to proceed on 10 continuous lines, in which case replacement of filter cloths and/or separation of the filter cake might be rendered possible during filtration without disturbing, slowing down or even interrupting the filtration process. Here, it was regarded as being desirable to provide a filtration system that would be easy to handle while enabling a whole variety of different filtration processes to be perforrned without much conversion such as parallel- or series-15 connected filtration methods.
This task is solved by the main claim. The subordinate claims concern preferreddesign versions.
The invention concems a filtration system for removing solid particles from liquids or suspensions and is provided with a cover plate as well as filtration device located on the underside of the cover plate, characterised in that the said filtration device comprises 25 flexible sealing elements and a filter plate, whereby the filter plate, which is aligned so as to run essentially parallel to the cover plate, is capable of being moved perpendicularly relative to the longitudinal axis of the cover plate, further that sealing elements are located between the cover plate and filter plate to form a filtration chamber and a filter unit is located between the sealin~ elements and the filter plate, further that a base plate is located 30 underneath the filter plate at a distance from the filter plate, further that one or more flexible ' CA 02224924 1997-12-18 lifting elements are located between the filter plate and base plate and are connected via as pressure medium to a pressure-generating device.
The filter plate is essentially aligned so as to run parallel to the cover plate owing to some slight deviations in its position likely to occur on account of the flexibility of the sealing elements. The sealing elements are also capable of acting as spacers between the filter plate and cover plate when the filter plate is pressed by the lifting elements against the sealing elements, e.g. while the filtration operation is in progress. Minor differences may occur in the formability or deforrnability of the sealing elements due to the nature of the material from which they made which, however, have had no noticeable effect on restricting the success of the invention.
There is also a likelihood of a slight difference occurring in the position of the filter plate on account of varying deformability of the lifting elements due to the resilience of the material, a circumstance which, however, does not deter from the outstanding success of the invention, especially as facilities are provided for carrying out appropriate adjustments to the position of the filter plate, e.g. by varying pressure using pressure-loadable sealing elements.
For example, plerelled fiexible lifting elements may assume the form of moulded cushions or air cushions usable as large- and/or small-area units. It is also possible to make use of tubes to serve as flexible lifting elements.
A type of tube capable of being used may be designed in such a way for example that, prior to pressure-loading, the circumference of the tube remains essentially unchanged in the cross-sectional area in the relieved state as well as when pressure-loading takes place but ' CA 02224924 1997-12-18 that the shape of the tube cross-sectional area differs before and during pressure-loading.
For example, a fabric-reinforced tube usable as a lifting element re-eals a variable cross-sectional shape in the relieved state but its circumference in the cross-sectional area remains essentially unchanged.
A flexible lifting element may assume the form of a hollow body with resilient walls rnadc of flexible material which increases in diameter in the cross-sectional area when p e.i~ e is applied and which reduces its diameter in the absence of pressure due, for 10 inslance, to the inherent elasticity or internal stress of its material.
The flexible li~ing elements are mounted between the filter plate and base plate in such a way that the flexible lifting elements - due to their deformability when acted upon by 15 pressure - reduce the distance between the cover plate and filter plate when under pressure caused by the filter plate ascending perpendicularly to the longitudinal axis of the cover plate in the direction of the cover plate, i.e. upwards. When pressure is released, the diameter of the flexible lifting elements for example is reduced and the filter plate travels in the direction of the base plate, i.e. downwards. On account of the arrangement of the 20 flexible lifting elements, the filter plate remains essentially aligned parallel to the longitudinal axis of the cover plate during the ascending and descending motions.
It is observed as being an advantage when the diameter of the tubes undergoes change 25 when pressure-loaded and the tubes reveal an approximately identical shape in the cross-sectional area when acted upon by a defined pressure. Owing to the use of tubes, whose shape is capable of undergoing change when acted upon by pressure, the filtration system on which the invention is based caters for even distribution of forces over the filter plate so that ideal running up to the cover plate is rendered possible.
In addition, it has been established that the use of flexible tubes enables the filter plates to be pressed with adequate evenness in the direction of the cover plate after filtration involving compressible filter cal;e, so much so that the filter cake is dehydrated to such an extent that adequate drying or dehydration of the filter cake is rendered possible without the 5 necessity of employing additional costly diaphragms used on conventional-type filter systems.
In oi:e ver,lon of the invention-related object, the tubes can be made to form a10 parallel, meander-shaped and/or circular arrangement. The preferable arrangement is to have the tubes arranged so as to be approximately parallel with one another. Thearrangement of the tubes is dependent on the design of the filter plate, e.g. in the form of a round filter or rectangular-shaped filter. It proves an advantage if the tubes are linked to one another, for example using flexible connections, via a pressure medium. These flexible 1~ connections as well as the manifolds may assume same form, material and size as the tubes, again warranting homogeneous action of the contact-pressure forces produced by the tubes on the filter plate and by means of which the filter plate is pressed against the cover plate via the sealing elements.
In another version of the invention-related filtration system the tubes can be acted upon by the pressure-generating device via a pressure medium, preferably air, water and/or liquids containing oil. The use of pressure media is dependent on the designated application of the filtration system, although air or water (air in particular) will prove advisable, for 25 example as a means of minimi.cing corrosion on the pressure-generating device. Use can be made of machines to serve as a pressure-generating device that convey the energy fed to it from a drive unit to the gas and/or liquid, e.g. electric pumps and the like.
CA 02224924 l997-l2-l8 The design of the filter plates used on the invention-related filtration system is such that they provide free passage for the liquid, chiefly rendered possible by the filter plate being porous. The pores on the upper side of the filter plate are interlinked by ducts, at least to a partial extent, the liquid flowing through the ducting and/or via the pores located on the 5 underside of the filter plate into a filtrate drain. For example, in the course of filtration, the liquid - having been freed from solid particles - passes through the filter unit via the pores located on the upper side of the filter plate and, by means of ducts, to the pores located on the underside. On the in;ention-related filtration system the filter plate can be, and is preferably designed with pOI es, in which case a number of the pores are interconnected via 10 ducts, those ducts located on the outlet side being linked to a filtrate drain and those on the inlet side being connected up to the filtration chamber.
It is an advantage to load the tubes - located on the underside of the filter plate - with 15 pressure in such a way that their diameter undergoes change, preferably as viewed from the cross-sectional angle. However, deformability as regards length has no disturbing effect.
Filter material capable of being used can assume the form of belt-type fabric filters of 20 cloth or non-woven fabric as well as metal, natural, plastic- or glass-fibre, filtering paper, or filter diaphragms, e.g. from cellulose derivates, ceramic or plastic material. At the opposite ends of the filtration system or filtration device, roller elements can be fitted which, apart from guiding the filter unit, can if need be serve to wind it on or unreel it. The filter unit is guided on the filter plate of the invention-related filtration system in such a way that the 25 entire area of the filter plate acts as a support to the filter unit, thus precluding the formation of dead zones which tend to restrict the filtration area on conventional systems.
Another advantage on the invention-related filtration system is that two or more30 filtration devices can be combined, in which case the base plate on one of the filtration devices is designed as a cover plate with another filtration device then located on, or forming contact with the underside of that cover plate. A further advantage on the invention-related filtration system is that the filtrate drains are provided with a common outlet line, thus facilitating parallel connection of the filtration devices. On the other hand, it 5 is also possible to link the filtrate drain on one of the filtration devices to the inlet line of the filtration chamber on another filtration device so as to facilitate series connection of the filtration devices. Connecting the filter devices up in series enables a higher stage of filtration to be carried out.
Resorting to parallel connection of the filtration devices provides the user with a continuous process by operating one filtration device, while on another such device the filter cake that has meanwhile accumulated can be separated laterally after shutting down the filter plate and winding on or unreeling the filter medium.
Design Versions:
Design versions are described in the following description with reference made to the drawings. The drawings are int~nllP~ to provide a simplified portrayal in enlarged diagram form and thus lay no claim to being true to scale. They depict the following:
Fig. 1 Side view of the invention-related filtration system during the process of filtration and with the tubes being acted upon by compressed air.
CA 02224924 l997-l2-l8 - Fig. 2 Side view of the invention-related filtration system following completion of the filtration process and after the tubes have been evacuated.
Fig. 3 Top view focusing on the filter plate fitted with the filter unit.
The invention-related filtration system comprises a cover plate 1. Located underneath the cover plate 1 and parallel to it is a filter plate 2 (Fig. 1). Flexible sealing elements 3 10 made of conventional rubber-like material can also be designed as flexible tubes so as to increase the lateral sealing efficiency on the filter chamber 4 of the invention-related filtration system. For example, tubes 7 and the sealing elements 3 designed as tubes can be linked to one another and acted upon simultaneously by air as a pressure medium.
Tubes 3 are arranged on the underside of the cover plate l in such a way that, when tubes 7 are acted upon by pressure, tubes 3 and the filter plate 2 seal off against the filter cloth 5. The cover plate 1 reveals feed lines capable of conveying the liquid due to be 20 filtrated to the filtration chamber 4. Located on the underside of the filter plate 2 are flexible tubes 7, e.g. made of silicon and/or a rubber-like material and forming a parallel arrangement to one another. Pressure-loading here is effected by means of compressed air.
Tube 7 can be a fabric-reinforced type made of standard commercial plastic or material containing rubber and whose cross-sectional shape undergoes change when acted upon by pressure, but whose cross-sectional circumference remains essenti~lly unchanged.
Use can also be made of tubing material not containing any fabric reinforcement made of standard commercial plastic or material containing rubber and on which the cross-sectional CA 02224924 l997-l2-l8 circumference and cross-sectional shape both undergo change as pressure-loading of the tube varies.
As a result of pressure-loading, the filter plate 2 is made to move in the direction of the cover plate 1, thus sealing offthe sides of filtration chamber 4 via the sealing elements 3 so as to prevent escape of the liquid that is under pressure and due to undergo filtration.
It is important that the filter plate 2 can be made to proceed in essentially parallel motion to the cover plate, perpendicularly to its lon~itu-lin~l axis so as to warrant adequate sealing off of the filter chamber 4.
Located on the upper side of the filter plate 2 is a standard commercial filter cloth 5.
This filter cloth 5 is guided by roller elements 9 and wound or unwound on reels. The liquid due to be filtered is conveyed via feed lines through the cover plate l into the filter chamber 4, is pressed through the filter cloth 5 and then proceeds via the filtrate drains to a collecting basin After a suitable filter cake has formed, the filtrate still present inside the filtration chamber 4 can be pressure-forced via the feed lines located in thecover plate 1 through the filter cake and into the filter plate 2. The filter cake can be dehydrated even further by blowing air into the filtration chamber 4. On a compressible filter cake, it is also possible to apply a far higher pressure-load on tubes 7, thus reducing the distance between the cover plate 1 and the filter plate 2 - by deforrning the sealing elements 3, or even by relieving pressure on these sealing elements 3 - in such a way that pressing out of the filter cake can be carried out. The ducts of the filter plate 2 opening out via pores on the underside of the filter plate 2 lead to the filtrate drain or drains.
Tubes 7 are linked at one end by a manifold 12 (Fig. 3) which is connected up to a pump. The other end oftubes 7 are hermetically sealed offby means of dummy plugs 14.
CA 02224924 l997-l2-l8 To effect disposal of the filter cake that has accumulated on the filter cloth 5, tubes 7 can be evacuated by pumping the pressure medium out of tubes 7. By opening a valve on the manifold 12 It is also possible to allow the pressure medium to escape from tubes 7 5 under inherent stress and the wei;,ht load of the filter plate 2 (Fig. 2).
A~er the filter plate 2 has been lowered, the filter cloth 5 can be made to travel sideways by means of roller elements 9 so as to remove the filter cake. In this case it is possible for the filter cloth 5 to be run back following separation of the filter cake or for it 0 to remain on the roller elements 9. When running back the filter cloth 5, it can be cleaned by means of a pressure medium forced through a jet-nozzle unit mounted between the roller elements 9. While pressure is exerted on tubes 7, the filter plate 2 runs on guide rails arranged at the side of the filter plate 2, proceeding upwards in the direction of the cover plate 1 so that the longitudinal plane of the filter plate 2 is brought into parallel alignment 15 with the longitudinal axis 11 of the cover plate 1 chiefly as a result of the evenly applied force coming from tubes 7, apart from revealing consistent spacing.
Besides it is possible, though not necessary or compulsory, for the sealing elements 3 20 to be linked to the same pressure-generating device used to load pressure on tubes 7.
Conversely, it is also possible for the sealing elements 3 to be coupled separately to a pressure-generating device.
Control equipment used to control the pressure-generating devices, the pumps used for supplying the filtration chamber 4 with filtration solution, etc. are not described in further detail here as these are conventional devices sufficiently familiar to the expert.
In oi:e ver,lon of the invention-related object, the tubes can be made to form a10 parallel, meander-shaped and/or circular arrangement. The preferable arrangement is to have the tubes arranged so as to be approximately parallel with one another. Thearrangement of the tubes is dependent on the design of the filter plate, e.g. in the form of a round filter or rectangular-shaped filter. It proves an advantage if the tubes are linked to one another, for example using flexible connections, via a pressure medium. These flexible 1~ connections as well as the manifolds may assume same form, material and size as the tubes, again warranting homogeneous action of the contact-pressure forces produced by the tubes on the filter plate and by means of which the filter plate is pressed against the cover plate via the sealing elements.
In another version of the invention-related filtration system the tubes can be acted upon by the pressure-generating device via a pressure medium, preferably air, water and/or liquids containing oil. The use of pressure media is dependent on the designated application of the filtration system, although air or water (air in particular) will prove advisable, for 25 example as a means of minimi.cing corrosion on the pressure-generating device. Use can be made of machines to serve as a pressure-generating device that convey the energy fed to it from a drive unit to the gas and/or liquid, e.g. electric pumps and the like.
CA 02224924 l997-l2-l8 The design of the filter plates used on the invention-related filtration system is such that they provide free passage for the liquid, chiefly rendered possible by the filter plate being porous. The pores on the upper side of the filter plate are interlinked by ducts, at least to a partial extent, the liquid flowing through the ducting and/or via the pores located on the 5 underside of the filter plate into a filtrate drain. For example, in the course of filtration, the liquid - having been freed from solid particles - passes through the filter unit via the pores located on the upper side of the filter plate and, by means of ducts, to the pores located on the underside. On the in;ention-related filtration system the filter plate can be, and is preferably designed with pOI es, in which case a number of the pores are interconnected via 10 ducts, those ducts located on the outlet side being linked to a filtrate drain and those on the inlet side being connected up to the filtration chamber.
It is an advantage to load the tubes - located on the underside of the filter plate - with 15 pressure in such a way that their diameter undergoes change, preferably as viewed from the cross-sectional angle. However, deformability as regards length has no disturbing effect.
Filter material capable of being used can assume the form of belt-type fabric filters of 20 cloth or non-woven fabric as well as metal, natural, plastic- or glass-fibre, filtering paper, or filter diaphragms, e.g. from cellulose derivates, ceramic or plastic material. At the opposite ends of the filtration system or filtration device, roller elements can be fitted which, apart from guiding the filter unit, can if need be serve to wind it on or unreel it. The filter unit is guided on the filter plate of the invention-related filtration system in such a way that the 25 entire area of the filter plate acts as a support to the filter unit, thus precluding the formation of dead zones which tend to restrict the filtration area on conventional systems.
Another advantage on the invention-related filtration system is that two or more30 filtration devices can be combined, in which case the base plate on one of the filtration devices is designed as a cover plate with another filtration device then located on, or forming contact with the underside of that cover plate. A further advantage on the invention-related filtration system is that the filtrate drains are provided with a common outlet line, thus facilitating parallel connection of the filtration devices. On the other hand, it 5 is also possible to link the filtrate drain on one of the filtration devices to the inlet line of the filtration chamber on another filtration device so as to facilitate series connection of the filtration devices. Connecting the filter devices up in series enables a higher stage of filtration to be carried out.
Resorting to parallel connection of the filtration devices provides the user with a continuous process by operating one filtration device, while on another such device the filter cake that has meanwhile accumulated can be separated laterally after shutting down the filter plate and winding on or unreeling the filter medium.
Design Versions:
Design versions are described in the following description with reference made to the drawings. The drawings are int~nllP~ to provide a simplified portrayal in enlarged diagram form and thus lay no claim to being true to scale. They depict the following:
Fig. 1 Side view of the invention-related filtration system during the process of filtration and with the tubes being acted upon by compressed air.
CA 02224924 l997-l2-l8 - Fig. 2 Side view of the invention-related filtration system following completion of the filtration process and after the tubes have been evacuated.
Fig. 3 Top view focusing on the filter plate fitted with the filter unit.
The invention-related filtration system comprises a cover plate 1. Located underneath the cover plate 1 and parallel to it is a filter plate 2 (Fig. 1). Flexible sealing elements 3 10 made of conventional rubber-like material can also be designed as flexible tubes so as to increase the lateral sealing efficiency on the filter chamber 4 of the invention-related filtration system. For example, tubes 7 and the sealing elements 3 designed as tubes can be linked to one another and acted upon simultaneously by air as a pressure medium.
Tubes 3 are arranged on the underside of the cover plate l in such a way that, when tubes 7 are acted upon by pressure, tubes 3 and the filter plate 2 seal off against the filter cloth 5. The cover plate 1 reveals feed lines capable of conveying the liquid due to be 20 filtrated to the filtration chamber 4. Located on the underside of the filter plate 2 are flexible tubes 7, e.g. made of silicon and/or a rubber-like material and forming a parallel arrangement to one another. Pressure-loading here is effected by means of compressed air.
Tube 7 can be a fabric-reinforced type made of standard commercial plastic or material containing rubber and whose cross-sectional shape undergoes change when acted upon by pressure, but whose cross-sectional circumference remains essenti~lly unchanged.
Use can also be made of tubing material not containing any fabric reinforcement made of standard commercial plastic or material containing rubber and on which the cross-sectional CA 02224924 l997-l2-l8 circumference and cross-sectional shape both undergo change as pressure-loading of the tube varies.
As a result of pressure-loading, the filter plate 2 is made to move in the direction of the cover plate 1, thus sealing offthe sides of filtration chamber 4 via the sealing elements 3 so as to prevent escape of the liquid that is under pressure and due to undergo filtration.
It is important that the filter plate 2 can be made to proceed in essentially parallel motion to the cover plate, perpendicularly to its lon~itu-lin~l axis so as to warrant adequate sealing off of the filter chamber 4.
Located on the upper side of the filter plate 2 is a standard commercial filter cloth 5.
This filter cloth 5 is guided by roller elements 9 and wound or unwound on reels. The liquid due to be filtered is conveyed via feed lines through the cover plate l into the filter chamber 4, is pressed through the filter cloth 5 and then proceeds via the filtrate drains to a collecting basin After a suitable filter cake has formed, the filtrate still present inside the filtration chamber 4 can be pressure-forced via the feed lines located in thecover plate 1 through the filter cake and into the filter plate 2. The filter cake can be dehydrated even further by blowing air into the filtration chamber 4. On a compressible filter cake, it is also possible to apply a far higher pressure-load on tubes 7, thus reducing the distance between the cover plate 1 and the filter plate 2 - by deforrning the sealing elements 3, or even by relieving pressure on these sealing elements 3 - in such a way that pressing out of the filter cake can be carried out. The ducts of the filter plate 2 opening out via pores on the underside of the filter plate 2 lead to the filtrate drain or drains.
Tubes 7 are linked at one end by a manifold 12 (Fig. 3) which is connected up to a pump. The other end oftubes 7 are hermetically sealed offby means of dummy plugs 14.
CA 02224924 l997-l2-l8 To effect disposal of the filter cake that has accumulated on the filter cloth 5, tubes 7 can be evacuated by pumping the pressure medium out of tubes 7. By opening a valve on the manifold 12 It is also possible to allow the pressure medium to escape from tubes 7 5 under inherent stress and the wei;,ht load of the filter plate 2 (Fig. 2).
A~er the filter plate 2 has been lowered, the filter cloth 5 can be made to travel sideways by means of roller elements 9 so as to remove the filter cake. In this case it is possible for the filter cloth 5 to be run back following separation of the filter cake or for it 0 to remain on the roller elements 9. When running back the filter cloth 5, it can be cleaned by means of a pressure medium forced through a jet-nozzle unit mounted between the roller elements 9. While pressure is exerted on tubes 7, the filter plate 2 runs on guide rails arranged at the side of the filter plate 2, proceeding upwards in the direction of the cover plate 1 so that the longitudinal plane of the filter plate 2 is brought into parallel alignment 15 with the longitudinal axis 11 of the cover plate 1 chiefly as a result of the evenly applied force coming from tubes 7, apart from revealing consistent spacing.
Besides it is possible, though not necessary or compulsory, for the sealing elements 3 20 to be linked to the same pressure-generating device used to load pressure on tubes 7.
Conversely, it is also possible for the sealing elements 3 to be coupled separately to a pressure-generating device.
Control equipment used to control the pressure-generating devices, the pumps used for supplying the filtration chamber 4 with filtration solution, etc. are not described in further detail here as these are conventional devices sufficiently familiar to the expert.
The fact that the invention-related filtration system can also be operated in such a way that the liquid due to be fed to it can be handled under pressure by the filter unit 5 or by applying vacuum on the outlet side of the filter plate 2 is regarded as an advantagJe.
The invention-related filtration system unites the optimum filtration properties of a laboratory-scale pressure suction filter with industrial requirements. The pressure-loaded lub- ;ystem for lifting and lowering the filter plate applying virtually ideal distribution of fo-~ . ~ombines with the mobility of the filter medium for discharging the solid particles and 10 subs;~quent cleaning of the filter cloth within a very short period of time so as to warrant extremely low downtime and thus a high degree of ser~/ice time. The simplicity of the invention-related filtration system, e g. by the use of easily replaceable tubes for the filter-plate lifting system as well as easily exchangeable filter cloths for each filtration device cater for extremely high system availability.
By coupling up additional filtration devices, the filtration system is easily adapted to individual requirements where increase in capacity is called for. A computer control function incorporated in the filtration system facilitates optimum adaptation of the individual JO cycles to given operating requirements. For the expert, these are factors serving to eliminate the familiar disadvantages associated with the current state of the art, while providing an ideal combination of the advantages brought about by the invention-related filtration system.
The invention-related filtration system unites the optimum filtration properties of a laboratory-scale pressure suction filter with industrial requirements. The pressure-loaded lub- ;ystem for lifting and lowering the filter plate applying virtually ideal distribution of fo-~ . ~ombines with the mobility of the filter medium for discharging the solid particles and 10 subs;~quent cleaning of the filter cloth within a very short period of time so as to warrant extremely low downtime and thus a high degree of ser~/ice time. The simplicity of the invention-related filtration system, e g. by the use of easily replaceable tubes for the filter-plate lifting system as well as easily exchangeable filter cloths for each filtration device cater for extremely high system availability.
By coupling up additional filtration devices, the filtration system is easily adapted to individual requirements where increase in capacity is called for. A computer control function incorporated in the filtration system facilitates optimum adaptation of the individual JO cycles to given operating requirements. For the expert, these are factors serving to eliminate the familiar disadvantages associated with the current state of the art, while providing an ideal combination of the advantages brought about by the invention-related filtration system.
Claims (25)
1. Filtration system for removing solid particles from liquids with a cover plate (1) and a filtration device (10) located on the underside of the cover plate (1), characterised in that the filtration device (10) comprises flexible sealing elements (3) and a filter plate (2) whereby the filter plate (2) - aligned essentially parallel to the cover plate (1) - is movable perpendicularly relative to the longitudinal axis (11) of the cover plate (1), the sealing elements (3) provided between the cover plate (1) and filter plate (2) to form a filtration chamber (4), a filter unit (5) located between the sealing elements (3) and filter plate (2), a base plate (6) located underneath the filter plate (2) and at a distance from the filter plate (2), one or more flexible lifting elements (7) between the filter plate (2) and base plate (6) and connected via a pressure medium to apressure-generating device.
2. Filtration system for removing solid particles from liquids according to claim 1, characterised in that the flexible lifting elements (7) are capable of being deformed when pressure-loaded, in such a way that the distance between the cover plate (1) and filter plate (2) is rendered variable.
3. Filtration system for removing solid particles from liquids according to claim 1 or 2, characterised in that the flexible lifting elements (7) assume the form of moulded cushions.
4. Filtration system for removing solid particles from liquids according to any of the claims 1 to 3, characterised in that the flexible lifting elements (7) assume the form of tubes.
5. Filtration system for removing solid particles from liquids according to any of the claims 1 to 4, characterised in that loading of the tubes (7) with a defined pressure results in the tubes (7) revealing an approximately identical diameter in the cross-sectional area.
6. Filtration system for removing solid particles from liquids according to any of the claims 1 to 5, characterised in that the tubes (7) are arranged approximately parallel to each another.
7. Filtration system for removing solid particles from liquids according to any of the claims 1 to 6, characterised in that the tubes (7) form a meander-shaped and/or circular arrangement.
8. Filtration system for removing solid particles from liquids according to any of the claims 1 to 7, characterised in that the tubes (7) are interconnected via a pressure medium.
9. Filtration system for removing solid particles from liquids according to any of the claims 1 to 8, characterised in that the tubes (7) are acted upon by a pressure-generating device via a pressure medium.
10. Filtration system for removing solid particles from liquids according to any of the claims 1 to 9, characterised in that the filter plate (2) is constructed with pores, in which case a number of the pores are interconnected via ducts, those ducts located on the outlet side being linked to a filtrate drain and those on the inlet side being connected up to the filtration chamber (4).
11. Filtration system for removing solid particles from liquids according to any of the claims 1 to 10, characterised in that the filter unit (5) assumes a flat belt-shape.
12. Filtration system for removing solid particles from liquids according to claim 11, characterised in that the flat belt-shape filter unit is a cloth-type filter unit.
13. Filtration system for removing solid particles from liquids according to any of the claims 1 to 12, characterised in that the filter unit (5) is guided on roller elements (9).
14. Filtration system for removing solid particles from liquids according to any of the claims 1 to 13, characterised in that the filter unit (5) can be wound on or unreeled via roller elements (9).
15. Filtration system for removing solid particles from liquids according to any of the claims 1 to 14, characterised in that the roller elements (9) are located on opposite sides of the filtration device (10).
16. Filtration system for removing solid particles from liquids according to any of the claims 1 to 15, characterised in that the filter unit (5) is movable on the filter plate (2).
17. Filtration system for removing solid particles from liquids according to claim 16, characterised in that the filter unit (5) is capable of being guided on the filter plate (2).
18. Filtration system for removing solid particles from liquids according to any of the claims 1 to 17, characterised in that the filtration chamber (4) can be filled via inlet lines.
19. Filtration system for removing solid particles from liquids according to claim 18, characterised in that the inlet lines are led through the cover plate (1).
20. Filtration system for removing solid particles from liquids according to any of the claims 1 to 19, characterised in that the sealing elements (3) are designed in the form of flexible tubes.
21. Filtration system for removing solid particles from liquids according to any of the claims 1 to 20, characterised in that the sealing elements (3) are connected via a pressure medium to a pressure-generating device.
22. Filtration system for removing solid particles from liquids according to any of the claims 1 to 21, characterised in that the filtration system reveals two or more filtration devices (10).
23. Filtration system for removing solid particles from liquids according to claim 22, characterised in that the base plate (6) of the filtration device (10) is designed as a cover plate (1) in such a way that another filtration device (10) is located on the underside of that cover plate (1).
24. Filtration system for removing solid particles from liquids according to claim 22 or 23, characterised in that the filtrate drains of the filtration devices (10) open out into a common outlet line.
25. Filtration system for removing solid particles from liquids according to claim 22 or 23, characterised in that the filtrate drain on one of the filtration devices (10) is connected to the inlet lines of the filtration chamber (4) on the other filtration device (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19522133A DE19522133C2 (en) | 1995-06-19 | 1995-06-19 | Filtration system for the separation of solid particles |
| DE19522133.8 | 1995-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2224924A1 true CA2224924A1 (en) | 1997-01-03 |
Family
ID=7764653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002224924A Abandoned CA2224924A1 (en) | 1995-06-19 | 1996-06-08 | Filtration system for removing solid particles |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0833685B1 (en) |
| CN (1) | CN1067290C (en) |
| AT (1) | ATE189617T1 (en) |
| AU (1) | AU723824B2 (en) |
| CA (1) | CA2224924A1 (en) |
| DE (3) | DE19522133C2 (en) |
| WO (1) | WO1997000111A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6309623B1 (en) | 1997-09-29 | 2001-10-30 | Inhale Therapeutic Systems, Inc. | Stabilized preparations for use in metered dose inhalers |
| DE19904637C1 (en) * | 1999-02-05 | 2000-03-09 | Hoesch & Soehne Eberhard | Filter press comprises hydraulic cylinders to bring plates and seals into contact, where they are held on anchor bars whilst hydraulic ring-bellows exerts evenly-distributed closure force, enabling shorter construction |
| US6650114B2 (en) * | 2001-06-28 | 2003-11-18 | Baker Hughes Incorporated | NMR data acquisition with multiple interecho spacing |
| CN101091846B (en) * | 2007-05-22 | 2010-05-19 | 西安航天华威化工生物工程有限公司 | Vertical type full automatic plate-and-frame filter press, and filter technique |
| DE102016003510A1 (en) | 2016-03-21 | 2017-09-21 | Horst Artner | Apparatus and method for producing the closing force in chamber filter presses. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3306458A (en) * | 1964-02-28 | 1967-02-28 | Hirs Gene | Multiple shell filters |
| DE2720178B1 (en) * | 1977-05-05 | 1978-06-01 | Klein Alb Kg | Method and device for discontinuous filtering of suspensions |
| FR2580516B1 (en) * | 1985-04-17 | 1989-09-15 | Sauvaget Jean C | DEVICE FOR THE PARALLEL MOUNTING OF FILTERING HANDLES FOR THE PURIFICATION OF WATER AND ALL FLUIDS TO BE PURCHASED IN INDUSTRIAL, AGRICULTURAL OR OTHER AREAS |
| FR2610535B1 (en) * | 1987-02-05 | 1989-06-16 | Zaster Jury | ROOM PRESS FILTER |
| US5094760A (en) * | 1990-10-05 | 1992-03-10 | Bratten Jack R | Liquid filter apparatus and method |
-
1995
- 1995-06-19 DE DE19522133A patent/DE19522133C2/en not_active Expired - Fee Related
-
1996
- 1996-06-08 CN CN96194903A patent/CN1067290C/en not_active Expired - Fee Related
- 1996-06-08 EP EP96918583A patent/EP0833685B1/en not_active Expired - Lifetime
- 1996-06-08 DE DE19680449T patent/DE19680449D2/en not_active Expired - Fee Related
- 1996-06-08 AT AT96918583T patent/ATE189617T1/en not_active IP Right Cessation
- 1996-06-08 WO PCT/DE1996/001065 patent/WO1997000111A1/en not_active Ceased
- 1996-06-08 DE DE59604428T patent/DE59604428D1/en not_active Expired - Lifetime
- 1996-06-08 AU AU61207/96A patent/AU723824B2/en not_active Ceased
- 1996-06-08 CA CA002224924A patent/CA2224924A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19522133C2 (en) | 1997-07-17 |
| EP0833685A1 (en) | 1998-04-08 |
| CN1067290C (en) | 2001-06-20 |
| WO1997000111A1 (en) | 1997-01-03 |
| ATE189617T1 (en) | 2000-02-15 |
| DE19522133A1 (en) | 1997-01-09 |
| DE59604428D1 (en) | 2000-03-16 |
| AU723824B2 (en) | 2000-09-07 |
| DE19680449D2 (en) | 1998-07-23 |
| EP0833685B1 (en) | 2000-02-09 |
| CN1188423A (en) | 1998-07-22 |
| AU6120796A (en) | 1997-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3734227B2 (en) | Upflow type high-speed filter | |
| FI113454B (en) | Filter press for filtering suspensions | |
| US6280638B1 (en) | Apparatus for continuous purification of liquids, dewatering and drying of the separated solids | |
| CA1114303A (en) | Upflow sand filter with substantially imperforate hold-down diaphragm | |
| US3696930A (en) | Horizontal compression type automatic filter press | |
| KR101804350B1 (en) | Dehydrating apparatus of sludge | |
| US4430231A (en) | Filtering apparatus and method | |
| CN109432841A (en) | A kind of band vacuum filtration formula filter press | |
| RU95120689A (en) | FILTER PRESS | |
| AU723824B2 (en) | Filtration system for removing solid particles | |
| US6561361B2 (en) | Belt filter press with improved wedge section | |
| CN112156539A (en) | Filter material layer capable of elastically stretching and retracting and filter device thereof | |
| CN113413650A (en) | Plate-frame filter press | |
| US4477350A (en) | Liquid filtering apparatus | |
| CN101670202B (en) | Vertical type full automatic pressure filter | |
| CN114804572A (en) | Sludge press with distributed pressing units | |
| CN111420437B (en) | Vacuum filter | |
| CN114159865A (en) | A crawler type high pressure dehydrator | |
| CA1265065A (en) | Filter apparatus and method | |
| CN102284205B (en) | Flexible tube presser for discharging mud cake by using multi-layer water permeable plate through extrusion method | |
| CN217526609U (en) | Crawler-type high-pressure dehydrator | |
| JP2947058B2 (en) | Filtration press in filter press | |
| SU1181685A1 (en) | Belt filter-press | |
| RU2104744C1 (en) | Belt filter press | |
| KR100534371B1 (en) | Sludge sediment - dehydrating apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |