NL2025635B1 - Filter device - Google Patents
Filter device Download PDFInfo
- Publication number
- NL2025635B1 NL2025635B1 NL2025635A NL2025635A NL2025635B1 NL 2025635 B1 NL2025635 B1 NL 2025635B1 NL 2025635 A NL2025635 A NL 2025635A NL 2025635 A NL2025635 A NL 2025635A NL 2025635 B1 NL2025635 B1 NL 2025635B1
- Authority
- NL
- Netherlands
- Prior art keywords
- filter device
- filter
- brush
- brush member
- fluid
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 216
- 238000001914 filtration Methods 0.000 claims abstract description 64
- 238000005406 washing Methods 0.000 claims abstract description 31
- 239000000706 filtrate Substances 0.000 claims abstract description 30
- 238000007790 scraping Methods 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 13
- 244000005700 microbiome Species 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 239000000835 fiber Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 65
- 239000000126 substance Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000010408 sweeping Methods 0.000 description 8
- 239000012065 filter cake Substances 0.000 description 7
- 239000013067 intermediate product Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000000717 retained effect Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
- B01D29/46—Edge filtering elements, i.e. using contiguous impervious surfaces of flat, stacked bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/10—Brush filters ; Rotary brush filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention comprises a filter device configured for filtering a fluid, wherein: - the filter device defines a filtration flow path that extends from the fluid supply through the 5 filter brushes into the filtrate drain, - the filter device further comprises a brush deformation member which is movable along the filter brushes to displace at least a portion of at least one first brush member with respect to at least one adjacent second brush member, thereby locally positioning the at least one first brush member and the at least one second brush member at a cleaning distance from each 10 other, the cleaning distance being larger than the filtration distance, and - the filter device defines a washing flow path that extends from the wash fluid supply into the wash fluid drain and passes between the at least one first brush member and the at least one second brush member.
Description
P34396NL00/ABL Title: Filter device
FIELD OF THE INVENTION The invention relates the field of filter devices for filtering a fluid.
BACKGROUND OF THE INVENTION Filter devices are used in many different applications for filtration of raw fluids such as liquids and gases comprising contaminating substances, for example in water purification or industrial exhaust gas processing. These filter devices may intercept and retain contaminating particles suspended in the raw fluid in or on a filter medium while allowing the filtered fluid to pass through the filter medium, thereby removing the contaminating particles from the fluid. These filter devices are called mechanical filter devices. Additionally or alternatively, chemical filtration may be performed, comprising chemical reactions involving contaminating substances. These chemical reactions may convert the contaminating substances into non-contaminating substances. These chemical reactions may be performed by micro-organisms such as bacteria, which are present in or on the filter medium. Filter devices using micro-organisms are also called biological filter devices. The chemical reactions may additionally or alternatively be influenced by a catalyst present in or on the filter medium.
Contaminating particles retained by the filter medium of a mechanical filter device may accumulate over time, creating a filter cake that obstructs fluid flow through the filter. In biological filter devices, a filter cake may be formed by growing and/or multiplying micro- organisms. Formation of a filter cake can cause an increased pressure drop over the filter device or even stop the fluid flow through the filter device altogether if the filter cake is allowed to grow due to continuing accumulation of contaminating particles and/or growth of micro-organisms. In order to prevent this, the filter medium is periodically replaced or periodically or continuously cleaned. Periodically replacing the filter medium may require frequent disassembly of the filter device and may be relatively costly, labour intensive and time consuming. Further, the filter device will generally be incapable of performing a filtration operation during replacement of the filter
-2- medium. Therefore, it is preferable in many applications to periodically or continuously clean the filter medium, rather than replacing it every time a filter cake has formed and grown to a certain extent. Filter devices wherein the filter medium is continuously cleaned during a filtration operation include drum filters, settling tanks, and continuous washing sand filters like the DynaSand filter, which are very large and require many different appendages such as electric motors, pumps, and compressors.
In many filter devices wherein the filter medium is periodically cleaned, such as disc filters, membrane filters, and bag filters, the filter medium is cleaned by a reversed flow of wash fluid through the filter medium, called a backwash flow, which removes the filter cake. Generally, raw fluid flow during the cleaning operation is interrupted and large volumes of wash fluid are used. In Bernoulli filters, raw fluid flow is not interrupted, but a very large volume of wash fluid is used.
Interruption of the raw fluid flow and consequent interruption of the filtration operation is undesirable in many applications. In order to overcome this, a number of filter devices, usually two or three, may be arranged in parallel, such that at least one filter device may be performing the filtration operation at all times. Using multiple parallel filter devices increases size, cost and complexity of the installation.
Filter devices wherein the filter medium is cleaned while the raw fluid flow and the filtration operation are not interrupted exist, for example the UDI 6Matic. This filter uses a screen as a filter medium and includes movable suction nozzles which suck the filter cake from the screen from the upstream side of the screen. This filter device uses many moving parts and requires atleast one additional pump for the wash fluid flow. Although small when compared to some other types of filter devices, the wash fluid volume used during a cleaning operation is still fairly large.
OBJECTIVE OF THE INVENTION Itis an objective of the invention to provide a filter device wherein a filter medium can be cleaned without interruption of the fluid flow supplied to the filter device, while using relatively little wash fluid.
It is a further objective of the invention to provide a filter device wherein a filter medium can be cleaned in a relatively short time.
-3- It is a further objective of the invention to provide a filter device wherein a filter medium can be cleaned without reversal of a fluid flow through the filter medium. It is a further objective of the invention to provide a filter device wherein a filtration operation continues uninterrupted while a cleaning operation is performed.
It is a further objective of the invention to provide a compact, mechanically simple filter device with few moving parts and appendages required for its functioning.
Itis a further objective of the invention to provide a method of cleaning a filter device.
SUMMARY OF THE INVENTION In a first aspect of the invention, the invention comprises a filter device configured for filtering a fluid, the filter device comprising one or more filter brushes to filter the fluid, a fluid supply to supply the fluid to the filter brushes, a filtrate drain to drain the fluid in a filtered state from the device, a wash fluid supply to supply wash fluid to the device, and a wash fluid drain to drain used wash fluid from the device, wherein: - each of the filter brushes comprises multiple brush members which are arranged at a filtration distance from each other to filter particles from the fluid, - the filter device defines a filtration flow path that extends from the fluid supply through the filter brushes into the filtrate drain, - the filter device further comprises a brush deformation member which is movable along the filter brushes to displace at least a portion of at least one first brush member with respect to at least one adjacent second brush member, thereby locally positioning the at least one first brush member and the at least one second brush member at a cleaning distance from each other, the cleaning distance being larger than the filtration distance, and - the filter device defines a washing flow path that extends from the wash fluid supply into the wash fluid drain and passes between the at least one first brush member and the at least one second brush member being located at the cleaning distance from each other.
This filter device may be cleaned by moving the brush deformation member along the filter brushes. The at least one first brush member and the at least one second brush member are then locally moved apart, such that a flow resistance between the at least one first brush member and the at least one second brush member is reduced. This allows a large washing flow that extends from the wash fluid supply into the wash fluid drain and passes between the at least one first brush member and the at least one second brush member and thereby cleans the at least one first brush member and the at least one second brush member.
-4- Moving the brush deformation member along the filter brushes allows different sets of first and second brush members to be displaced sequentially, allowing these to be cleaned as well.
This filter device allows cleaning of the filter brushes while the fluid supply is uninterrupted and without reversal of fluid flow through the filter brushes. Due to the locally large wash fluid flow, the brush deformation member may be moved along the filter brushes relatively quickly, such that cleaning of the filter brushes requires little time and consumes little wash fluid. The flow of fluid supplied to the filter device may continue uninterrupted during the cleaning of the filter brushes. A filtering operation of the filter device may also be performed uninterrupted during the cleaning of the filter brushes by a further section of the filter brushes, which further section does not comprise the first and second brush members that are currently displaced. In an embodiment of the filter device, the wash fluid supply is the fluid supply.
In an embodiment of the filter device, the brush deformation member comprises at least one scraper, wherein - the filter brushes comprise at least one fixed end and at least one free end, - the scraper is movable along a scraping path with respect to the filter brushes at a free end of the brush members, - the scraper protrudes at least partially into at least one filter brush within at least a part of the scraping path. In an embodiment of the filter device, the wash fluid drain is movable together with the scraper with respect to the filter brushes along at least a part of the scraping path.
In an embodiment of the filter device, the wash fluid drain is movable to a position near the at least one first brush member and the at least one second brush member being located at the cleaning distance from each other.
In an embodiment of the filter device, the scraper is movable with respect to the wash fluid drain along the scraping path from a first scraper position into a second scraper position and vice versa, wherein the second scraper position is on an opposite side of the wash fluid drain when compared to the first scraper position when seen along the scraping path.
In an embodiment of the filter device, the scraper is movable along the scraping path in two mutually opposite scraping directions.
-5- In an embodiment of the filter device, the scraper is configured to protrude into the brush members over a protrusion distance of 0.1 to 10 mm, in particular 0.5 to 2 mm. In an embodiment of the filter device, the cleaning distance is between 1 and 10 mm, in particular between 3 and 6 mm. In an embodiment of the filter device, the V-shaped plates comprise metal or plastic. In an embodiment of the filter device, the brush members comprise V-shaped plates.
In an embodiment of the filter device, the brush members comprise fibres. In an embodiment of the filter device, the fibres comprise metal or plastic. In an embodiment of the filter device: - the filter brushes are arranged in a cylindrical layout, - the filter brushes are fixated on a radially outer brush end and are free on a radially inner brush end, - the scraper is arranged on a central scraping tube, - the wash fluid drain is arranged on the central scraping tube, - the central scraping tube is movable along a longitudinal device axis of the filter device, wherein the longitudinal device axis is parallel to the scraping path. In an embodiment of the filter device, one of the fluid supply and the filtrate drain is arranged near a top end of the filter device and the other of the fluid supply and the filtrate drain is arranged on at least one position along a circumference of the filter device, wherein in particular the filtrate drain is arranged near a top end of the filter device and the fluid supply is arranged on at least one position along a circumference of the filter device.
In an embodiment of the filter device, one of the fluid supply and the filtrate drain is arranged near a bottom end of the filter device and the other of the fluid supply and the filtrate drain is arranged on at least one position along a circumference of the filter device, wherein in particular the filtrate drain is arranged near a bottom end of the filter device and the fluid supply is arranged on at least one position along a circumference of the filter device.
-6- In an embodiment of the filter device, the filter device comprises a first flexible end plate arranged on a first end of each filter brush and a second flexible end plate arranged on a second end of each filter brush.
In an embodiment of the filter device, the filter brushes comprise a filtration agent such as micro-organisms or a catalyst. The micro-organisms may be bacteria that perform a conversion of a contaminating substance into a non-contaminating substance or an intermediate product. The catalyst may catalyse a chemical reaction converting a contaminating substance into a non-contaminating substance or an intermediate product. An intermediate product formed by the micro-organisms may be converted into another intermediate product or a non-contaminating substance by other or the same micro- organisms that form said intermediate product or in a chemical reaction catalysed by the catalyst. An intermediate product formed in a reaction catalysed by the catalyst may be converted into another intermediate product or a non-contaminating substance by the micro- organisms or by a chemical reaction catalysed by another or the same catalyst.
In an embodiment of the filter device, the filtration agent is arranged on a surface of at least one brush member.
In an embodiment of the filter device, the filter device further comprises a wash fluid flow regulating unit which is in fluid communication with the wash fluid drain.
In an embodiment of the filter device, the wash fluid flow regulating unit comprises a pressure regulator connected to a wash fluid drain pipe which is connected to the wash fluid drain.
In an embodiment of the filter device, the at least one first brush member is configured to spring back to a default position at a filtration distance from the at least one second brush member in a sweeping motion when the scraper passes beyond said at least one first brush member. The sweeping motion of the at least one first brush member further cleans the at least one first brush member by moving the at least one first brush member through the washing flow path and by accelerating and subsequently decelerating the at least one first brush member.
In an embodiment of the filter device, the at least one first brush member is configured to overshoot its default position when sweeping and to collide with the at least one second brush member. The at least one first brush member is further cleaned by the impact shock generated by the collision with the neighbouring at least one second brush member and the
-7- at least one second brush member is additionally cleaned by the impact shock generated by the collision with the at least one first brush member. In an embodiment of the filter device, the wash fluid drain is configured to be positioned near the position of the at least one first brush member during the cleaning operation. In an embodiment of the filter device, the wash fluid drain is configured to be positioned such that no or negligible flow through the wash fluid drain occurs when no cleaning operation is performed.
It will be clear to the skilled person that the features of any of the above embodiments of the filter device can be combined. In a second aspect of the invention, the invention comprises a method of performing a cleaning operation on a filter device according to any of the preceding embodiments, wherein the cleaning operation comprises the step of moving the brush deformation member along the filter brushes, thereby locally positioning the at least one first brush member and the at least one second brush member at the cleaning distance from each other, thereby defining a washing flow path that extends from the wash fluid supply into the wash fluid drain and passes between the at least one first brush member and the at least one second brush member being located at the cleaning distance from each other, wherein a wash fluid flow is created between said at least one first brush member and said at least one second brush member, thereby cleaning said at least one first brush member and said at least one second brush member by the wash fluid flow.
This method allows cleaning the filter device in a fast efficient manner, using relatively little wash fluid. In an embodiment of the method, the cleaning operation is performed while the fluid is flowing through the filter device. In an embodiment of the method, the wash fluid is the same as the fluid. In an embodiment of the method, the brush deformation member comprises at least one scraper, wherein the scraper is moved along the filter brushes.
-8- In an embodiment of the method, each first brush member springs back to a respective default position at a filtration distance from a second brush member in a sweeping motion when the scraper passes beyond said first brush member.
In an embodiment of the method, the sweeping motion of the at least one first brush member further cleans the at least one first brush member by moving the at least one first brush member through the washing flow path and by accelerating and subsequently decelerating the at least one first brush member.
In an embodiment of the method, the at least one first brush member overshoots its default position when sweeping and collides with a neighbouring at least one second brush member, such that the at least one first brush member is further cleaned by the impact shock generated by the collision with the neighbouring at least one second brush member and the at least one second brush member is additionally cleaned by the impact shock generated by the collision with the at least one first brush member.
In an embodiment of the method, the wash fluid drain is positioned near the position of the at least one first brush member during the cleaning operation.
In an embodiment of the method, the wash fluid drain is positioned such that no or negligible flow through the wash fluid drain occurs when no cleaning operation is performed.
In an embodiment of the method, the method comprises the step of removing less than 100% of the filtration agent from the filter brushes.
In an embodiment of the method, the method comprises the step of regulating the wash fluid flow with the wash fluid flow regulating unit.
It will be clear to the skilled person that the features of any of the above embodiments of the method can be combined.
BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the filter device according to invention and the method according to the invention will be described by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:
-9- Figure 1 shows a view in cross-section of a first embodiment of a filter device according to the invention performing a filtration operation, Figure 2 shows a view in cross-section of the filter device of Fig. 1 performing a filtration operation, Figure 3 shows a view in cross-section of the filter device of Fig. 2 performing a filtration operation, Figure 4A shows a view in cross-section of the filter device of Fig. 1 performing a cleaning operation, Figure 4B shows a view in cross-section of a second embodiment of the filter device according to the invention performing a cleaning operation, Figure 5 shows an enlarged view of the filter device of Fig. 4A, Figure BA shows a view in perspective of a filter brush of the filter device of Fig. 1 performing a filtration operation, Figure 6B shows a view in perspective of a filter brush of the filter device of Fig. 1 during a cleaning operation, Figure 7A shows a view in cross-section of a filter brush of a third embodiment of the filter device according to the invention comprising V-shaped plates, Figure 7B shows schematic image of a part of the third embodiment of the filter device according to the invention comprising the V-shaped plates of Fig. 7A, Figure 8 shows a perspective view of a part of the third embodiment of the filter device according to the invention comprising the V-shaped plates of Fig. 7A, Figures 9A — 9F show enlarged views of a scraper of a fourth embodiment of the filter device according to the invention, wherein the scraper is movable with respect to the wash fluid drain.
DETAILED DESCRIPTION OF THE DRAWINGS Fig. 1 shows a cross-section of a first embodiment of a filter device 1 according to the invention configured for filtering a fluid 2. The filter device 1 comprises filter brushes 3 to filter the fluid 2, a fluid supply 4 to supply the fluid 2 to the filter brushes 3, a filtrate drain 5 to drain the fluid in a filtered state 43 from the device, a wash fluid supply 7 to supply wash fluid 6 to the device 1, and a wash fluid drain 8 to drain used wash fluid 6 from the device 1. A cross- section of the filter device 1 of Fig. 1 along line A — A is shown in Fig. 2, where a filtrate chamber 48 is shown on the right hand side, while a filtration chamber 47 is shown on the left hand side. Fig. 1 shows a cross-section of the filter device 1 of Fig. 2 along line B — B.
During a filtration operation, the fluid 2 follows a filtration flow path 9 that extends from the fluid supply 4 through the filter brushes 3 into the filtrate drain 5. The filtration flow path ©
-10- comprises an inflow 9A, a filtration chamber entry 9B, a brush entry 9C, a filtrate chamber flow 9D, a collector chamber inflow SE, and an outflow SF. The fluid 2 flows into the filter device 1 in the inflow 9A and subsequently flows into various filtration chambers 47 in the chamber entry 9B. There, the fluid 2 flows into the filter brushes 3 in the brush entry 9C. After passing through the filter brushes 3, the fluid in a filtered state 43 flows through the filtrate chamber 48 in the filtrate chamber flow 8D and subsequently into a collector 49 in the collector chamber inflow 9E. From the collector 49, the fluid in a filtered state 43 flows out of the filter device 1 in the outflow 9F.
The filter brushes 3 comprise a fixed end 10 and a free end 11, while each of the filter brushes 3 comprises multiple brush members 13 which are arranged at a filtration distance 12 from each other to filter particles 15 from the fluid 2. At their fixed end 10, the filter brushes 3 are fixed in position by a brush fixation member 54.
Fig. 3 shows a cross-section of a the filter device 1 of Fig. 2 along line C — C. A first flexible end plate 37A is arranged on a first brush end 51 of the filter brushes 3 and allows fluid in a filtered state 43 to exit from the filtrate chambers 48 into the collector chamber 49, but does not allow fluid 2 from the filtration chambers 47 to enter the collector chamber 49 without passing through the filter brushes 3. A second flexible end plate 37B is arranged on a second brush end 52 of the filter brushes 3.
The filtrate drain 5 is arranged near a top end 34 of the filter device 1 and the fluid supply 4 is arranged along a circumference 36 of the filter device 1. Alternatively, the filtrate drain 5 may be arranged along the circumference 36 and the fluid supply 4 may be arranged near the top end 34. Additionally or alternatively to the top end 34, the filtrate drain 5 or the fluid supply 4 may be positioned near a bottom end 35 of the filter device 1. Alternatively, one of the fluid supply 4 and the filtrate drain 5 may be arranged near the top end 34 and the other of the fluid supply 4 and the filtrate drain may be arranged near the bottom end 35 Fig. 4A shows the filter device of Fig. 2 while a cleaning operation is performed. The cleaning operation is performed while the fluid 2 is flowing through the filter device 1. The filter device 1 comprises a brush deformation member 16 which is movable along the filter brushes 3 to displace at least a portion of at least one first brush member 17 with respect to at least one adjacent second brush member 18, thereby locally positioning the at least one first brush member 17 and the at least one second brush member 18 at a cleaning distance 19 from each other, the cleaning distance 19 being larger than the filtration distance 12. In the first embodiment of the filter device 1 according to the invention, shown in Figs. 1 — 4A and 5, the
-11- brush members are 26 mm long and the cleaning distance 19 is between 3 and 6 mm, although other values may be used for different applications. While no cleaning operation is performed, the wash fluid drain 8 is positioned such that no or negligible flow through the wash fluid drain 8 occurs.
The filter device 1 has a generally cylindrical shape. The filter brushes 3 are arranged in a cylindrical layout and are fixated on a radially outer brush end 30 and are free on a radially inner brush end 31. The brush deformation member 16 comprises a scraper 21. The scraper 21 and the wash fluid drain 8 are arranged on a central scraping tube 32. This central scraping tube 32 is movable along a longitudinal device axis 33 of the filter device 1. By moving the central scraping tube 32 along this longitudinal device axis 33, the scraper 21 can be moved along the filter brushes 3.
Positioning the first and second brush members 17, 18 at the cleaning distance 19 from each other forms a washing flow path 20 that extends from the wash fluid supply 7 into the wash fluid drain 8 and passes between the at least one first brush member 17 and the at least one second brush member 18 being located at the cleaning distance 19 from each other. A detail view of the action of the brush deformation member 16 of Fig. 4A is shown in Fig. 5.
The washing flow path 20 comprises a wash fluid inflow 20A, a brush washing flow 20B, a drain inflow 20C and a wash fluid removal flow 20D. The wash fluid 6 flows into the filter device 1 in the wash fluid inflow 20A. The wash fluid then flows into the filter brushes 3, between the at least one first brush member 17 and the at least one second brush member 18 being located at the cleaning distance 19 from each other, in the brush washing inflow 20B. The wash fluid 6 subsequently flows into the wash fluid drain 8 in the drain inflow 20C before the wash fluid 6 is removed from the filter device 1 in the wash fluid removal flow 20D, wherein the wash fluid 6 leaves the filter device 1 through a wash fluid drain pipe 42 which is connected to the wash fluid drain 8. In the depicted embodiments, the wash fluid 6 is the fluid
2. Thus, the wash fluid inflow 20A coincides with the inflow 9A of the fluid 2.
In the embodiment of the filter device 1 shown in Fig. 4A, the scraper 21 is moved downwards during the cleaning operation. Fig. 4B shows a cross-section of a second embodiment of the filter device according to the invention performing a cleaning operation, wherein the scraper 21 is moved upwards during the cleaning operation. The wash fluid drain 8 should be arranged behind the scraper 21 with respect to the scraping direction 22 because the first and second brush members 17, 18 are positioned behind the scraper 21 with respect to the scraping direction 22. The scraper 21 is therefore positioned below the wash fluid drain 8 in
-12- the first embodiment of the filter device according to the invention, while it is positioned above the wash fluid drain 8 in the second embodiment of the filter device according to the invention.
During the cleaning operation, the filtration operation may continue in a region of the filter brushes 3 which is not influenced by the brush deformation member 16. The flow of fluid in a filtered state 43 flowing out of the filtrate drain 5 may be reduced, since washing flow path 20 may have a significantly lower flow resistance than the filtration flow path 9, causing nearly all fluid 2 flowing into the filter device 1 to follow the washing flow path 20 instead of the filtration flow path 9.
Fig. 6A shows a detail view of a filter brush 3 of the filter device 1 of Figs. 1 — 3, showing the basic principle of the filtration operation. Fluid 2 comprising contaminating particles 15 flows through the filter brush 3 during a filtration operation. The contaminating particles 15 are retained in the filter brush 3, cleaning the fluid 2. Fig. 6B shows a detail view of the filter brush 3 of Fig. 4A, while a cleaning operation is performed, showing the basic principle of the cleaning operation. The brush deformation member 16 moves past the filter brush 3 in a scraping direction 22, sequentially displacing first brush members 17 with respect to adjacent second brush members 18. The brush deformation member 16 increases the distance between the first and second brush members 17, 18 from the filtration distance 12 to the cleaning distance 19. Because of this enlargement of the distance between the first and second brush members 17, 18, particles 15 that were retained by these brush members 13 may be washed away by the wash fluid 6, which cleans the first and second brush members 17, 18. Wash fluid 6 that has passed between the first and second brush members 17, 18 and thus has a high concentration of particles 15 is led in a different direction than fluid in a filtered state 43 that has passed between brush members 3 which are at the filtration distance 12 from each other, such that the filtered fluid 43 is not contaminated by the used wash fluid
6.
In the filter device of Figs. 1 — 5, the wash fluid supply 7 is the fluid supply 4 and consequently, the wash fluid 6 is the fluid 2. The filter brushes 3 are thus washed during a cleaning operation by the same fluid 2 that they filter during a filtration operation. No separate wash fluid supply 7 is required.
By moving the central scraping tube 32 along the longitudinal device axis 33, the scraper 21 is movable along a scraping path 50 with respect to the filter brushes 3 at a free end 11 of the filter brushes 3. The longitudinal device axis 33 is parallel to the scraping path 50. The
-13- scraper 21 protrudes partially into the filter brushes 3 over a protrusion distance 25 within at least a part of the scraping path 50. The protrusion distance is between 0.5 and 2 millimetres, although other values may be used for different applications. The wash fluid drain 8 is movable together with the scraper with respect to the filter brushes 3 along at least a part of the scraping path 50. The wash fluid drain 8 is movable to a position near the first brush member 17 and the second brush member 18 being located at the cleaning distance 19 from each other, such that the wash fluid drain 8 is positioned properly to receive the wash fluid 6 flowing out from between the first brush member 17 and the second brush member 18 located at the cleaning distance 9 from each other.
The cleaning operation comprises moving the scraper 21 along the filter brushes 3 to locally place the first and second brush members 17, 18 at the cleaning distance 19 from each other, such that the wash fluid flow between said adjacent first and second brush members 17, 18 is generated due to the decreased flow resistance between said adjacent first and second brush members 17, 18. This decreased flow resistance allows a large wash fluid flow. The first and second brush members 17, 18 are cleaned by the wash fluid flow. Moving the scraper 21 along the filter brushes 3 allows different sets of first and second brush members 17, 18 to be displaced sequentially, allowing these to be cleaned as well. Upon reaching the first brush end 51 of the filter brushes 3, the first flexible end plate 37A is allowed to flex such that the final brush members 13 can also be cleaned. Upon reaching the second brush end 52 of the filter brush 3, the first flexible end plate 37B is allowed to flex such that the final brush members 13 can also be cleaned. This filter device 1 allows cleaning of the filter brushes 3 while the fluid supply is uninterrupted and without reversal of fluid flow through the filter brushes 3. Due to the locally large wash fluid flow, the scraper 21 may be moved along the filter brushes 3 relatively quickly, such that cleaning of the filter brushes 3 requires little time and consumes little wash fluid 6. The flow of fluid 2 supplied to the filter device 1 may continue uninterrupted during the cleaning of the filter brushes 3. A filtering operation of the filter device 1 may also be performed uninterrupted during the cleaning of the filter brushes 3 by a further section of the filter brushes, which further section does not comprise the first and second brush members 17, 18 that are currently displaced. The first brush member 17 springs back to its default position 53 at the filtration distance 12 from a second brush member 18 when the scraper 21 passes beyond it, such that it sweeps through the washing flow path 20. The first brush member 17 is further cleaned by the wash fluid 6 as it sweeps through the washing flow path 20 and is also further cleaned by the G-
-14 - forces induced by the acceleration and subsequent deceleration at the beginning and end of the sweeping motion due to the inertia of the particles 15. At the end of the sweeping motion, the first brush member 17 may overshoot its default position due to inertia, colliding with a neighbouring second brush member 18. Both the first and the second brush members 17, 18 are then further cleaned by the impact shock generated by the collision of the first brush member 17 with the second brush member 18. This shock shakes off particles 15.
During the cleaning operation, the wash fluid drain 8 is positioned near the position of the first brush member 17. The wash fluid drain 8 is pasitioned such that no or negligible flow through the wash fluid drain 8 occurs when no cleaning operation is performed.
The filter device 1 comprises a wash fluid flow regulating unit 40 comprising a pressure regulator 41 connected to the wash fluid drain pipe 42 which is connected to the wash fluid drain 8. This allows the wash fluid flow to be regulated, which may be necessary of the filter device 1 is integrated in a pressurized system.
Fig. 7A shows a schematic image of brush members 13 of a third embodiment of a filter device 1 according to the invention comprising V-shaped plates 28. Fig. 7B shows schematic image of a top view of a filter device 1 comprising filter brushes 3 that comprise the V-shaped plates of Fig 7A. A schematic perspective view of the filter brushes 3 of the filter device 1 of Fig. 7B is shown in Fig. 8. The V-shaped plates 28 may comprise metal or plastic. Alternatively to the V-shaped plates 28, the brush members 13 may comprise fibres 29, as shown in Figs. 1 — 6B. These fibres may comprise metal or plastic. The filter brushes 3 may further comprise a filtration agent 38 such as micro-organisms or a catalyst, which may be arranged on a surface 39 of at least one brush member 13. During a cleaning operation, less than 100% of the filtration agent 38 may be cleaned off the filter brushes 3. It may be necessary to remove more than 0% of the filtration agent 38 during a cleaning operation, because the filter brushes 3 may foul otherwise due to for example growth of micro- organisms or degradation of the catalyst.
Figs. 9A — 9F show a detail view of a cross-section of a scraper 21 of a fourth embodiment of a filter device 1 according to the invention. The scraper 21 is movable with respect to the wash fluid drain 8 along the scraping path 50 between a first scraper position 26 and a second scraper position 27. The first and second scraper positions 26, 27 are located on opposite sides of the wash fluid drain 8 when seen along the scraping path 50.
-15- Moving the scraper 21 from one side of the wash fluid drain 8 to the other side of the wash fluid drain 8 allows a cleaning operation to be performed efficiently in both directions along the scraping path 50.
Figs 9A — 9F show that the scraper is movable with respect to the wash fluid drain 8 along the scraping path 50 from a first scraper position 26 into a second scraper position 27 and vice versa. The second scraper position 27 is on an opposite side of the wash fluid drain 8 when compared to the first scraper position 26 when seen along the scraping path 50. Figs. 9A — SC show how the scraper 21 may be moved from the first scraper position 26 to the second scraper position 27. Figs. 9D — 9F show how the scraper 21 may be moved from the second scraper position 27 to the first scraper position 26. The scraper 21 may slide over the central scraping tube 32 between the first and second scraper positions 26, 27 under application of sufficient force. The forces exerted on the scraper 21 due to movement of the scraper 21 along the filter brushes 3 are not sufficient to slide the scraper over the central scraping tube
32.
Fig. SA shows a scraper 21 in the first scraping position. Moving the central scraping tube 32 downwards pushes the scraper 21 against the first scraper stop plate 45, see Fig. 9B. Moving the central scraping tube 32 further downwards with sufficient force allows the scraper 21 to slide over de central scraping tube 32 until the scraper contacts the first scraper butt 44A, see Fig. 9C. The scraper 21 is now in the second scraper position 27, on the opposite side of the wash fluid drain 8 when compared to the first scraper position 26. Moving the scraper 21 from the second scraper position 27 to the first scraper position 26 may be performed in a similar way, see Figs. 9D — SF.
Moving the central scraping tube upwards pushes the scraper 21 against the second scraper stop plate 46, see Fig. 9E. Moving the central scraping tube 32 further upwards allows the scraper 21 to slide over de central scraping tube 32 until the scraper contacts the second scraper butt 44B, see Fig. OF. The scraper 21 is now in the first scraper position 26.
A filter device 1 of the fourth embodiment can move the scraper 21 in two opposite scraping directions along the scraping path 50 while performing a cleaning operation. In a single filter device 1 of the fourth embodiment, the cleaning operation can thus be performed while the scraper 21 moves in a similar fashion as depicted in Fig 4A, with the scraper 21 in the first scraper position 26, and while the scraper 21 moves in a similar fashion as depicted in Fig. 4B, with the scraper in the second scraper position 27. At the end of a first cleaning operation, when the scraper 21 has traversed the filter brushes 3, the scraper 21 can be positioned to
-16 - the other scraper position 26, 27, such that a subsequent second cleaning operation can be performed wherein the scraper 21 moves in the opposite scraping direction 22 when compared to the first cleaning operation.
Claims (36)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2025635A NL2025635B1 (en) | 2020-05-20 | 2020-05-20 | Filter device |
PCT/IB2021/054376 WO2021234626A1 (en) | 2020-05-20 | 2021-05-20 | Filter device and method of cleaning the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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NL2025635A NL2025635B1 (en) | 2020-05-20 | 2020-05-20 | Filter device |
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NL2025635B1 true NL2025635B1 (en) | 2021-12-07 |
Family
ID=72266784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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NL2025635A NL2025635B1 (en) | 2020-05-20 | 2020-05-20 | Filter device |
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NL (1) | NL2025635B1 (en) |
WO (1) | WO2021234626A1 (en) |
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FR3135402A1 (en) * | 2022-05-10 | 2023-11-17 | Laurent FOLLIET | FILTRATION DEVICE |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468354A (en) * | 1944-08-18 | 1949-04-26 | Osborn Mfg Co | Filtration apparatus |
FR2105570A5 (en) * | 1970-09-04 | 1972-04-28 | Ferrier Daniel | Self-clearing filter - automatic, mechanical deformation of filter sheet periodically dislodges sediment |
CN109432867A (en) * | 2018-11-21 | 2019-03-08 | 南通中国科学院海洋研究所海洋科学与技术研究发展中心 | A kind of Branchial filter |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8104453A (en) * | 1981-09-29 | 1983-04-18 | Norbertus Wouter Hendrik Verdu | CONTINUOUS FILTER. |
US10905981B2 (en) * | 2011-10-28 | 2021-02-02 | Alfa Laval Corporate Ab | Methods and apparatus for treating water and wastewater employing a cloth filter |
-
2020
- 2020-05-20 NL NL2025635A patent/NL2025635B1/en active
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2021
- 2021-05-20 WO PCT/IB2021/054376 patent/WO2021234626A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468354A (en) * | 1944-08-18 | 1949-04-26 | Osborn Mfg Co | Filtration apparatus |
FR2105570A5 (en) * | 1970-09-04 | 1972-04-28 | Ferrier Daniel | Self-clearing filter - automatic, mechanical deformation of filter sheet periodically dislodges sediment |
CN109432867A (en) * | 2018-11-21 | 2019-03-08 | 南通中国科学院海洋研究所海洋科学与技术研究发展中心 | A kind of Branchial filter |
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