NL2015302B1 - Filtration system for filtering a body of water. - Google Patents
Filtration system for filtering a body of water. Download PDFInfo
- Publication number
- NL2015302B1 NL2015302B1 NL2015302A NL2015302A NL2015302B1 NL 2015302 B1 NL2015302 B1 NL 2015302B1 NL 2015302 A NL2015302 A NL 2015302A NL 2015302 A NL2015302 A NL 2015302A NL 2015302 B1 NL2015302 B1 NL 2015302B1
- Authority
- NL
- Netherlands
- Prior art keywords
- filtration system
- filtration
- filter unit
- filter
- water
- Prior art date
Links
Landscapes
- Filtration Of Liquid (AREA)
Abstract
The invention relates to a filtration system for filtering a body of water, in particular a pond, wherein the filtration system comprises a holder that is rotatable through both a filtration position and a cleaning position in a rotational direction about a vertical rotation axis and that is arranged for holding a plurality of filter units in a plurality of filter positions distributed around the rotation axis, wherein the holder is arranged for alternating the plurality of invertible filter units in said rotational direction between the filtration position and the cleaning position, wherein the filtration system comprises an inversion unit that is arranged for inverting each filter unit about its respective inversion axis when the respective filter unit moves from the filtration position towards the cleaning position.
Description
Filtration system for filtering a body of water BACKGROUND
The invention relates to a filtration system for filtering a body of water, in particular a pond. A drum filter is a well-known type of filtration system that is used to mechanically filter a body of water. Drum filters, although very effective, can be very large and expensive. Generally, drum filters can not be practically implemented in-line with further filters, such as biofilters, simply because of the lack of space.
It is an object of the present invention to provide an alternative filtration system that improves on at least one of the abovementioned drawbacks.
SUMMARY OF THE INVENTION
The invention provides a filtration system for filtering a body of water, in particular a pond, wherein the filtration system comprises a housing with at least one water inlet for receiving water from the body of water into the housing, a water outlet for discharging the water from the housing and a filtration position through which the water passes between the water inlet and the water outlet, wherein the filtration system is provided with a plurality of filter units for filtering the water passing through the filtration position, wherein the filtration system further comprises a cleaning position for cleaning said plurality of filter units, wherein the filtration system comprises a holder that is rotatable through both the filtration position and the cleaning position in a rotational direction about a vertical or substantially vertical rotation axis (in use) and that is arranged for holding the plurality of filter units in a plurality of filter positions distributed around the rotation axis, wherein the holder is arranged for alternating the plurality of filter units in said rotational direction between the filtration position and the cleaning position, wherein each filter unit comprises a sieve member with a first side and second side opposite to the first side, wherein each filter unit is invertible with respect to the holder about a horizontal or substantially horizontal inversion axis (in use), wherein the filtration system comprises an inversion unit that is arranged for inverting each filter unit about its respective inversion axis when the respective filter unit moves from the filtration position towards the cleaning position.
By using a plurality of invertible filter units, both sides of the sieve member can be used in the filtration process. Thus, a plurality of small filter units can be used instead of one big drum filter according to the prior art. The resulting filtration system can be more compact, while still providing the same performance. The filtration system can even remain operational during maintenance, as filter units that are not in the filtration position can be replaced without affecting the filter unit in the filtration position.
In an embodiment the inversion unit is arranged for inverting each filter unit between a first orientation in which the first side of the sieve member of the respective filter unit faces upwards or vertically upwards and a second orientation in which the first side of the sieve member of the respective filter unit faces downwards or vertically downwards, and vice versa. With either the first side or the second side facing upwards in the filtration position, the filter unit can be used to filter water. With either the first side of the second side facing downwards in the cleaning position, the pollution on the sieve member can be easily removed. The sides facing in the vertical direction can improve the uniformity of the distribution of water and/or pollution over the sieve member under the influence of gravity.
In an embodiment the inversion unit is arranged for inverting each filter unit about the inversion axis over an inversion angle of approximately 180 degrees. By fully inverting the filter unit, it can be used equally well in both the first orientation and the second orientation.
In an embodiment each filter unit comprises a gear that is rotationally fixed to the filter unit with respect to the inversion axis, wherein the inversion unit comprises a first pin that is arranged in a fixed inversion position between the filtration position and the cleaning position, wherein the first pin is arranged to engage with and rotate the gear of the respective filter unit when the respective filter unit is moved from the filtration position towards the cleaning position. The interaction between the first pin can occur automatically as the holder is rotated along the inversion position in the rotational direction and therefore can be considered as a passive actuation of the inversion. As the inversion does not require additional active actuators, such as an electric motor, the filtration system can be kept relatively simple, less expensive and less prone to malfunctions.
In an embodiment thereof each gear has four teeth, wherein the inversion unit comprises a second pin that is arranged in the fixed inversion position with respect to the housing between the filtration position and the cleaning position, wherein the first pin and the second pin are spaced apart to each engage with and rotate a subsequent teeth of the gear of the respective filter unit. Preferably, each gear is formed as a cross. Each pin can rotate the gear over an inversion angle equal to the interval between the teeth of the gear.
In an embodiment the first pin and/or the second pin are arranged above or below the center of the gear. The gear can thus pass along the inversion position in the rotational direction of the holder and be engaged by the pins, without the pins hindering the rotation of the holder.
In an embodiment the filtration system further comprises a guide that extends in the rotational direction along a path travelled by each filter unit, wherein the guide is arranged to abut each of the filter units in at least the filtration position for forcing and/or keeping the filter units in the first orientation or the second orientation. The guide can ensure that the filter units are in either the first orientation or the second orientation, at least in the filtration position, to ensure proper functioning of the filtration system.
In an embodiment thereof the guide extends at a guide height above or below the filter units, which guide height is egual to half the height of the filter units. The guide can thus slidably abut the top or bottom of the filter units and slidably force said filter units in either the first orientation or the second orientation.
Preferably, the guide is spaced apart from the filter units or absent at the inversion unit to allow for the inversion of the filter units by the inversion unit. This allows for the filter units to be inverted at the inversion position without the guide hindering said inversion.
In an embodiment the plurality of filter units comprises at least four filter units and wherein the holder comprises an egual number of the filter positions. By providing at least four filter units, the filter units can be alternated more guickly. Moreover, because of the inversion, a double number of sides can be used in the filtration position during every two cycles of the holder about the rotation axis. As a result, the sieve members degrade less quickly and require less maintenance.
In an embodiment the filter positions are equally distributed over the holder in the rotational direction. The holder can thus be rotated over equal rotation intervals to rotate subsequent filter units into the filter position and the cleaning position, respectively.
In an automated embodiment the filtration system comprises a drive for driving the rotation of the holder about the vertical rotation axis. Thus, it is not required to manually rotate the holder. The motor can further automate the filtration process, for example by rotating a rotation interval at regular time intervals.
In a further automated embodiment the filtration system comprises a control unit and a sensor that is electronically connected to the control unit, wherein the sensor is arranged for detecting the water level on top of the sieve member of the filter unit in the filtration position, wherein the control unit is operationally coupled to the drive for actuating said drive when a threshold water level has been detected by the sensor. The motor can thus be controlled based on the level of pollution in the filter unit, rather than based on a regular time interval. A filter unit can remain in the filtration position for a long period of time when the pollution in the water is relatively low. Similarly, when the pollution is relatively high, the filter unit is moved to the cleaning position more quickly.
In an embodiment the filtration system further comprises a cleaning unit in the cleaning position for cleaning the sieve member of the filter unit in the cleaning position. The cleaning unit can assist the removal of pollution from the sieve member in the cleaning position, for example in a case that the pollution does not detach from the sieve member solely under the influence of gravity.
In an embodiment the cleaning unit comprises a spout that is arranged to be directed at the sieve member of the filter unit in the cleaning position and that is arranged to be fluidically coupled to a source of cleaning medium for cleaning the sieve member with a jet of said cleaning medium. Preferably, the spout is arranged to be directed at the side of the sieve member of the filter unit in the cleaning position that faces upwards in said cleaning position. By directing a jet at the upwardly facing, clean side of the sieve member, the pollution at the downwardly facing, polluted side of the sieve member can be detached easily and can be assisted by the influence of gravity. After the pollution detaches from the sieve member, gravity takes over to discharge the pollution. Therefore, only a relatively small amount of cleaning medium or a relatively short burst can be used to detach the pollution. Consequently, the amount of waste water can be reduced. The filtration system according to the invention can thus be more efficient and/or environmentally friendly.
In an embodiment each filter unit comprises a frame for holding the sieve member, wherein the frame comprises a circumferential wall that defines a volume through which the water passes from the water inlet towards the water outlet, wherein the sieve member extends within the circumferential wall. The sieve member can thus be located in the direct path of the water from the water inlet towards the water outlet. The circumferential wall can direct the water towards and through the sieve member.
In an embodiment the first side and the second side of the sieve member are substantially planar and/or extend perpendicular to the circumferential wall. The water can thus pass in a direction normal to the sides of the sieve member through the sieve member.
In an embodiment the sieve member divides said volume in a first part at the first side of the sieve member and a second part at the second side of the sieve member. The circumferential wall and the sieve member together form two basket-like or bucket-like volumes for receiving the water in the filtration position and the cleaning medium in the cleaning position.
In an embodiment the sieve member symmetrically divides the volume into two equal or substantially equal parts. The sieve member can thus be used equally well in both the first orientation and the second orientation.
In an embodiment the circumferential wall projects from both the first side and the second side of the sieve member over a distance of at least three centimeters, and preferably at least four centimeters. The circumferential wall can prevent water from splashing out of the volume defined by the circumferential wall and/or direct the water towards the sieve member. Moreover, if the sieve member becomes polluted, the circumferential wall can contain a certain amount of water collected on top of the sieve member prior to the sieve member overflowing.
In a preferred embodiment the circumferential wall is cylindrical or substantially cylindrical. In this manner, the filter units and/or holder can be more compact.
In an embodiment the circumferential wall of each filter unit fits completely inside a minimum bounding circle extending concentrically around the inversion axis, wherein the minimum bounding circle has a first diameter, wherein the holder for each filter unit comprises a circular opening for receiving the respective filter unit, wherein the circular opening has a second diameter that is larger than the first diameter. The filter units can thus be inverted freely within their respective openings with respect to the holder about the inversion axis.
In an embodiment each filter unit is provided with an inversion shaft extending collinear with the inversion axis, wherein the inversion shaft rotatably couples the respective filter unit to the holder at its respective circular opening. Preferably, the inversion axis of the respective filter unit intersects with the center of the respective circular opening. Most preferably, the inversion axis extends radially, substantially radially, perpendicular or substantially perpendicular to the rotation axis.
In an embodiment the rotation axis is arranged between the filtration position and the cleaning position. The holder can thus be rotated about the rotation axis through both the filtration position and the cleaning position.
In an extended embodiment, the filtration system further comprises additional filtration devices located downstream of the water outlet, said additional filtration devices comprising filters of the group comprising biofilters, mechanical filters, bead filters, vortex filters and UV-filters. The filter units can act as pre-filters, reducing the number of large or small particles in the water, and thereby reducing the load on the subsequent downstream filter devices. The aforementioned filtration system according to the invention can be more compact than for example a drum filter, such that the filtration system can easily be placed in-line with other additional filtration devices.
The various aspects and features described and shown in the specification can be applied, individually, wherever possible. These individual aspects, in particular the aspects and features described in the attached dependent claims, can be made subject of divisional patent applications .
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be elucidated on the basis of an exemplary embodiment shown in the attached schematic drawings, in which: figures 1, 2 and 3 show subsequent steps of the operation of a filtration system with a plurality of filter units according to the invention; figure 4 shows one filter unit of the plurality of filter units according to figure 1 in more detail; figure 5 shows a cross section of the one filter unit according to the line V-V in figure 4; figures 6, 7 and 8 shows subsequent steps of the inversion of the one filter unit according to figure 4; and figure 9 shows a top view of the filtration system according to figure 1.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shows a filtration system 1 according to an exemplary embodiment of the invention. The filtration system 1 is used to filter water from a body of water, in particular water from a pond (not shown).
As schematically shown in figure 1, the filtration system 1 comprises a housing 2 with a water inlet section 3, a filtration section or filtration position 4 and a cleaning section or cleaning position 7. At the water inlet section 3, the filtration system 1 is provided with one or more water inlets 31, 32, 33 which are connected in fluid communication to the body of water. Typically, three water inlets 31, 32, 33 are provided for connection to one or more bottom pumps and/or skimmers at or near the body of water. If one of the water inlets 31, 32, 33 remains unused, it can be capped. The water from the one or more water inlets 31, 32, 33 is first collected in a water inlet section 3 of the housing 2, as schematically shown with arrow A. Subsequently, the water is directed from the water inlet section 3 towards and into the filtration position 4, as schematically shown with arrow B. The water passes through the filtration position 4 under the influence of gravity and ultimately leaves the housing 2 through a water outlet 8, as schematically indicated with arrow C. The water exiting the housing 2 via the water outlet 8 is returned to the body of water.
The filtration system 1 can be expanded with additional filtration devices located downstream of the water outlet 8 (not shown) , in which case the filtration position 4 as shown in figure 1 is considered to be a prefilter. The additional filtration devices may comprise further filters of the group comprising bio-filters, mechanical filters, bead filters, vortex filters, UV- filters. The water exiting the housing 2 through the water outlet 8 passes through the downstream filtration devices before being returned to the body of water.
The present invention relates to the filtration position 4 and the cleaning position 7 of the filtration system 1 and will now be described in further detail with reference to figures 1-8.
As shown in figure 1, the filtration system 1 is provided with a plurality of filter units 41, 42, 43, 44 and a holder 6 for holding said filter units 41, 42, 43, 44 in an equal number of filter positions 61, 62, 63, 64. In this exemplary embodiment, the filtration system 1 comprises four filter units 41, 42, 43, 44. In an alternative embodiment (not shown), the filtration system 1 may comprise less filter units, for example two or three, or more filter units, for example five, six, seven or eight. The filter units 41, 42, 43, 44 are functionally similar or identical to each other.
Figures 4 and 5 show one of the filter units 41 in more detail. Said filter unit 41 is representative for the other filter units 42, 43, 44. The filter unit 41 comprises a frame 45 for holding a sieve member 5. The frame 45 comprises a circumferential wall 46 that defines a volume V through which the water passes from the water inlet section 3 towards the water outlet 8. In this exemplary embodiment, the circumferential wall 46 is cylindrical or substantially cylindrical, thus defining a cylindrical volume V. Alternatively, the circumferential wall 46 may have another suitable shape, for example square or rectangular (not shown) . The circumferential wall 4 6 has a height H, in this example of approximately five to ten centimeters.
The filter unit 41 is tiltable, rotatable or invertible about a horizontal or substantially horizontal inversion axis S between a first orientation, as shown in figure 6, and a second orientation, as shown in figure 8. The filter unit 41 is substantially up-side-down or overturned in the second orientation with respect to the first orientation. The filter unit 41 is provided with an inversion shaft 47 that extends collinear with the inversion axis S and that rotatably couples the filter unit 41 to the holder 6 in its respective filter position 61.
As best seen in figure 4, the filter unit 41 comprises a gear 48 that is rotationally fixed to the filter unit 41 with respect to the inversion axis S. In particular, the gear 48 is fixedly mounted to the inversion shaft 47. In this exemplary embodiment, the gear 48 has four teeth 49, that form a cross. The gear 48 is used to actuate the inversion W of the filter unit 41 in a manner that will be described in more detail later.
The sieve member 5 is mounted to and extends within the circumferential wall 46 to span the cross section of said circumferential wall 46. The sieve member 5 has a first side 51 and a second side 52 opposite to the first side 51. Both sides 51, 52 are planar or substantially planar. Both planar sides 51, 52 extend perpendicular to or substantially perpendicular to the circumferential wall 46. Preferably, the sieve member 5 is a thin mesh layer with openings equal to or less than one-hundred micron. Such a mesh layer is suitable for effectively filtering or prefiltering rough and small particles from the water. When used in combination with a downstream additional filtration device, the sieve member 5 can reduce the load on the downstream filtration devices. As best seen in figure 5, the sieve member 5 extends at mid-height or center-height of the height H of the circumferential wall 46. As such, the sieve member 5 symmetrically divides the volume V as defined by the circumferential wall 46 into two equal or substantially equal parts. In this example, the filter unit 41 is fully mirror-symmetrical with respect to the sieve member 5. The circumferential wall 46 projects from both sides 51, 52 of the sieve member 5, preferably over a distance of at least three centimeters, and most preferably at least four centimeters .
The filter unit 4, when inverted from the first orientation, as shown in figure 6, to the second orientation, as shown in figure 8, circumscribes or fits completely inside a minimum bounding circle M, as shown in figures 4 and 5, extending concentrically around the inversion axis S. Said minimum bounding circle M has a first diameter D1 and defines a minimum clearance that has to be provided around the filter unit 4 to allow said filter unit 4 to freely rotate about the inversion axis S without being obstructed by other parts of the filtration system 1.
As shown in figure 9, the holder 6 comprises a disc 60 that extends through both the filtration position 4 and the cleaning position 7. The disc 60 is rotatable about a vertical or substantially vertical rotation axis R. Said rotation axis R preferably extends in an intermediate position between the filtration position 4 and the cleaning position 7 so that at least a part of the disc 60 is rotated through the filtration position 4 and another part of the disc 60 is rotated through the cleaning position 7 at any point in the rotation of said disc 60. In particular, at least one of the filter positions 61, 62, 63, 64 is in the filtration position 4 while another of the filter positions 61, 62, 63, 64 is in the cleaning position 7. In this example, the filtration position 4 and the cleaning position 7 are diametrically opposite to each other with respect to the rotation axis R of the holder 6. Thus, a rotation of disc 60 about the rotation axis R of one-hundred-and-eighty degrees moves a filter position 61, 62, 63, 64 from the filtration position 4 into the cleaning position 7.
In this exemplary embodiment, the filter positions 61, 62, 63, 64 are distributed equally or evenly over the disc 60 around the rotation axis R. In the case of four filter positions 61, 62, 63, 64, the filter positions 61, 62, 63, 64 are distributed around the rotation axis R with ninety degree intervals. In case of two filter positions, the interval would be one-hundred-and-eighty degrees. Similarly, the interval with any number of filter positions would be equal to three-hundred-and-sixty degrees divided by the number of filter positions. When the disc 60 is rotated about the rotation axis R, the filter positions 61, 62, 63, 64 subsequently, consecutively or in constant succession move in a direction or rotation T about the rotation axis R through the filtration position 4 and the cleaning position 7. The filter positions 61, 62, 63, 64 are thus alternated or interchanged between the filtration position 4 and the cleaning position 7 in said rotational direction T.
At each filter position 61, 62, 63, 64, the holder 6 is provided with an opening 65 in the disc 60 for accommodating or receiving a respective one of the filter units 41, 42, 43, 44. The inversion shafts 47 of the respective filter units 41, 42, 43, 44 are mounted to the disc 60 at or near the boundary of the respective openings 65. Each inversion shaft 47 is mounted such that the inversion axis S of the respective filter unit 41, 42, 43, 44 intersects with the center of the respective opening 65 and/or extends radially or substantially radially to the rotation axis R. The gears 48 of the respective filter unit 41, 42, 43, 44 are preferably located at or near the radial outside of the disc 60, in particular radially outside the circumference of said disc 60. Each opening 65 preferably has the same geometric shape as the circumferential wall 46 of the respective filter unit 41, 42, 43, 44, in this example circular. The opening 65 has a slightly larger dimension than said circumferential wall 46 to accommodate the respective filter unit 41, 42, 43, 44 and to allow inversion W of the respective filter unit 41, 42, 43, 44 about the inversion axis S within the boundaries of the opening 65. In particular, the opening 65 has a second diameter D2 that is larger than the first diameter D1 of the minimum bounding circle M. As a result, the filter units 41, 42, 43, 44 are freely rotatable W with respect to and/or within their respective openings 65 about their respective inversion axes S.
As shown in figures 1-3 and in more detail in figures 6-8, the filtration system 1 is provided with an inversion unit 90 that is arranged in an inversion position 9 between the filtration position 4 and the cleaning position 7 for inverting W each filter unit 41, 42, 43, 44 about its respective inversion axis S when the respective filter unit 41, 42, 43, 44 is moved from the filtration position 4 towards the cleaning position 7. In this exemplary embodiment, the inversion position 9 is located just after the halfway-point from the filtration position 4 towards the cleaning position 7, thus at an angle of at least ninety degrees and preferably at least one-hundred degrees about the rotation axis R from the filtration position 4. Alternatively, the inversion position 9 may be located at a different position between the filtration position 4 and the cleaning position 7, for example in a range of twenty to one-hundred-and-seventy degrees about the rotation axis R from the filtration position 4 towards the cleaning position 7.
The inversion unit 90 comprises a first pin 91 and a second pin 92 which protrude with respect to the housing 2 towards the holder 6 to engage one or more of the teeth 49 of the gears 48 of the respective filter units 41, 42, 43, 44 as they pass by in the rotation direction T. The pins 91, 92 are spaced apart from each other in the rotational direction T of the disc 60 to receive at least one of the teeth 49 of the gear 48 of a passing filter unit 41, 42, 43, 44 in between, as shown in figure 7. The first pin 91 and the second pin 92 are arranged to subsequently come into contact with two directly subsequent teeth 49 of the gear 48 of a passing filter unit 41, 42, 43, 44 to rotate the gear 48 and the respective filter unit 41, 42, 43, 44 fixedly attached thereto about the inversion axis S. As the exemplary gear 48 has four teeth 49 distributed over ninety degree intervals, each pin 91, 92 will be able to rotate the gear 48 and the associated filter unit 41, 42, 43, 44 over a maximum of ninety degrees, as shown in figures 2 and 3, and in more detail in figures 7 and 8. Thus, the two subsequent pins 91, 92 of the inversion unit 90 effectively invert the passing filter unit 41, 42, 43, 44 over an inversion angle equal to or approximating one-hundred-and-eighty degrees between the first orientation as shown in figure 6 and the second orientation as shown in figure 8.
By using the fixed pins 91, 92, the inversion unit 90 as shown can be considered as a passive inversion unit 90. Passive in the context of this invention means that the inversion unit 90 does not require an active element, such as an electric, pneumatic or hydraulic actuator, to effectuate the inversion of the filter units 41, 42, 43, 44. Alternatively, the inversion unit 90 may comprises a suitable active actuator, such as an electric motor, for each filter unit 41, 42, 43, 44 for actively driving the inversion W.
As shown in figure 1, the filtration system 1 optionally comprises a guide 95 that extends in the rotational direction T along a path travelled by each filter unit 41, 42, 43, 44. The guide 95 comprises a bar-like body 96 that preferably extends concentrically to the rotation axis R in a position vertically above or below the filter units 41, 42, 43, 44 at the radial inside or outside of said filter units 41, 42, 43, 44 with respect to the rotational axis R. The guide 95 extends at a guide height G above the disc 60 that is equal to or substantially equal to half of the height H of the circumferential walls 47 of the filter units 41, 42, 43, 44. The guide 95 therefore abuts each of the filter units 41, 42, 43, 44 passing underneath the guide 95 in at least the filtration position 4 for forcing and/or keeping the filter units 41, 42, 43, 44 in either the first orientation or the second orientation. In particular, the guide 95 slides along the top or bottom of the circumferential wall 46 of each of the filter units 41, 42, 43, 44 and, through said sliding contact, forces said filter units 41, 42, 43, 44 into a substantially level or horizontal, first or second orientation.
The guide 95 is absent or spaced apart from the filter units 41, 42, 43, 44 at and/or near the inversion position 9. In this exemplary embodiment, the guide 95 is interrupted shortly prior to the inversion position 9 in the rotation direction T and starts well after the inversion position 9, preferably at or near the cleaning position 7. The guide 95 does therefore not extend a full circumference or revolution around the rotation axis R. In particular after the inversion position 9, the filter unit 41, 42, 43, 44 may not be fully inverted and extend under a slight oblique angle facing towards the guide 95. When said filter units 41, 42, 43, 44 approach and come into contact with the guide 95, the guide 95 automatically forces the filter units 41, 42, 43, 44 into the first or second orientation.
In the event that the guide 95 extends above the filter units 41, 42, 43, 44, the pins 91, 92 are preferably located above the center of the gears 48 as the gears 48 pass the pins 91, 92, so that the downstream facing sides of the filter units 41, 42, 43, 44 drop away from the guide 95 when inverting. In this manner, the guide 95 can be extended as close as possible to the inversion position 9, without interfering with the inversion W. Similarly, if the guide 95 extends below the filter units 41, 42, 43, 44, the pins 91, 92 are preferably located below the center of the gears 48 as the gears 48 pass the pins 91, 92, so that the downstream facing sides of the filter units 41, 42, 43, 44 rise up from the guide 95.
By inverting the filter units 41, 42, 43, 44 at the inversion position 9 between the filtration position 4 and the cleaning position 7, the polluted side 51 of the sieve member 5 can be turned up-side-down, while the other, clean side 52 can be turned down-side-up. In particular, the first side 51 of the sieve member 5 faces upwards or vertically upwards in the first orientation, as shown in figure 6, and faces downwards or vertically downwards in the second orientation. Likewise, the second side 52 of the sieve member 5 faces downwards or vertically downwards in the first orientation, as shown in figure 6, and faces upwards or vertically upwards in the second orientation. It will be apparent to one skilled in the art that the second side 52 is the first side 51 in the next cycle of the respective filter unit 41, 42, 43, 44 through the filtration position 4. Overturning the polluted side 51 of the sieve member 5 can make it considerably easier to remove the pollution from said polluted side 51 in the cleaning position 7. Moreover, overturning presents the clean second side 52 for the next cycle of the respective filter unit 41, 42, 43, 44 through the filtration position, thereby efficiently using both sides 51, 52 of each sieve member 5 during every two cycles.
As shown in figure 1, the cleaning position 7 comprises a cleaning unit 70 with a spout 71 or another suitable ejector for a cleaning medium. The spout 71 is arranged above or vertically above the filter unit 41, 42, 43, 44 in the cleaning position 7 and is directed at the inverted, upwardly facing side 52 of the sieve member 5. The spout 71 is fluidically coupled to a source of cleaning medium, e.g. water or another suitable cleaning medium, for cleaning the sieve member 5 with a jet of said cleaning medium, as schematically shown with arrow D. The pressure of the cleaning medium is preferably at least one-hundred Bar or even higher. The cleaning medium passes through the sieve member 5 at high pressure and mechanically forces the pollution at the downwardly facing side 51 of the sieve member 5 to fall of said side 51 under the influence of gravity, as schematically shown with arrows E. Vertically below the filter unit 41, 42, 43, 44 in the cleaning position 7, the cleaning position 7 is provided with a pollution collection member 72, e.g. a chute or a hopper 73, for collecting the pollution that falls off the sieve member 5 and for discharging said pollution, together with the cleaning medium, through a discharge outlet 74, as schematically shown in figure 1 with arrow F. The discharge outlet 74 is typically connected in fluid communication to a sewer or waste collection device.
To further automate the process as described above, the filtration system 1 is preferably provided with a drive 100 for driving the rotation of the disc 60 in the rotational direction T about the vertical rotation axis R. The drive 100 is arranged for driving the disc 60 over rotation intervals that equal the angular intervals between the filter positions 61, 62, 63, 64. In this example, the rotation interval is ninety degrees. The drive 100 can be operated at regular time intervals, for example every thirty minutes. However, the filtration system 1 can optionally be provided with a control unit 101 and a sensor 102 that is electronically connected to the control unit 101. As schematically shown in figure 5, the sensor 102 is arranged for detecting the water level on top of the sieve member 5 of the filter unit 41, 42, 43, 44 in the filtration position 4 and for sending signals indicative of said water level to the control unit 101. The water level on top of the sieve member 5 is indicative of the amount of pollution that is collected on top of said sieve member 5. When the pollution gets thicker or denser, less water is able to pass through the sieve member 5 and ultimately, the water level starts to rise. As soon as a threshold water level L has been detected by the sensor 102, the control unit 101, which is also operationally connected to the drive 100, sends a control signal to the drive to rotate the disc 60.
As described before, the inversion position 9 is preferably located at an angle of more than ninety about the rotation axis R from the filtration position 4 towards the cleaning position 7. Hence, when the holder 6 is rotated over an angular interval of ninety degrees, the filter unit 41, 42, 43, 44 in the filtration position 4 is rotated up to or into proximity of, but not beyond the inversion position 9. The filter unit 41, 42, 43, 44 that was previously in the filtration position 4 is not yet inverted and the water collected on top of the pollution is allowed to slowly seep through the pollution at the polluted first side 51 of the sieve member 5, while another filter unit 41, 42, 43, 44 is in the filtration position 4 filtering the water from the body of water. In this manner, the water collected on top of the filter unit 41, 42, 43, 44 that is position just prior to the inversion position 9 can be drained into the water outlet 8 prior to inversion W of said filter unit 41, 42, 43, 44 so that said water is not discharged as waste water in the cleaning section 7, as schematically shown with arrow K.
It is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention. From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the scope of the present invention.
In summary, the invention relates to a filtration system 1 for filtering a body of water, in particular a pond, wherein the filtration system 1 comprises a holder 6 that is rotatable through both a filtration position 4 and a cleaning position 7 in a rotational direction T about a vertical rotation axis R and that is arranged for holding a plurality of filter units 41, 42, 43, 44 in a plurality of filter positions 61, 62, 63, 64 distributed around the rotation axis R, wherein the holder 6 is arranged for alternating the plurality of invertible filter units 41, 42, 43, 44 in said rotational direction T between the filtration position 4 and the cleaning position 7, wherein the filtration system 1 comprises an inversion unit 9 that is arranged for inverting each filter unit 41, 42, 43, 44 about its respective inversion axis S when the respective filter unit 41, 42, 43, 44 moves from the filtration position 4 towards the cleaning position 7.
Claims (30)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2015302A NL2015302B1 (en) | 2015-08-13 | 2015-08-13 | Filtration system for filtering a body of water. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2015302A NL2015302B1 (en) | 2015-08-13 | 2015-08-13 | Filtration system for filtering a body of water. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2015302B1 true NL2015302B1 (en) | 2017-02-28 |
Family
ID=58448735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2015302A NL2015302B1 (en) | 2015-08-13 | 2015-08-13 | Filtration system for filtering a body of water. |
Country Status (1)
| Country | Link |
|---|---|
| NL (1) | NL2015302B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755625A (en) * | 2021-01-15 | 2021-05-07 | 北京图腾猎技科技有限公司 | Centrifugal extraction filter for biological health product production |
-
2015
- 2015-08-13 NL NL2015302A patent/NL2015302B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755625A (en) * | 2021-01-15 | 2021-05-07 | 北京图腾猎技科技有限公司 | Centrifugal extraction filter for biological health product production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2168348C2 (en) | Filter | |
| CN109789347B (en) | Frame-type disc filter with bypass water control for preventing bypass water for backwashing | |
| US9744485B2 (en) | Fluid treatment system | |
| AU2020231174B2 (en) | Rotary disc filter having backwash guides | |
| KR19990014757A (en) | Apparatus and method for backwashing a fluid filter system | |
| EP2969108B1 (en) | Rotary disc filter with automatic integrated backwash and chemical cleaning system | |
| JP2008119608A (en) | Rotary disk filter and filtration apparatus | |
| US10143946B2 (en) | Device for removing impurities from a liquid and method for cleaning a corresponding device | |
| KR20130107907A (en) | A filter element with rotor blades and a filtering device with the same | |
| DE102004001506B4 (en) | tertiary filters | |
| US11801463B2 (en) | Filter apparatus | |
| DK2756874T3 (en) | A filter device | |
| NL2015302B1 (en) | Filtration system for filtering a body of water. | |
| US3493112A (en) | Filter apparatus including contaminant removal means | |
| KR101468655B1 (en) | Filtering device for water treatment | |
| JP4537468B2 (en) | Rotary filtration device | |
| KR101473429B1 (en) | Filter assembly for ballast water treatment system | |
| KR100380225B1 (en) | A continuous filter's auto back wash device used cyclone methode | |
| JP4041588B2 (en) | Filtration device | |
| KR20160024602A (en) | Strainer and control method thereof | |
| KR101155063B1 (en) | Centrifugal filter | |
| KR102053401B1 (en) | Cassette type filter device | |
| CN202136854U (en) | Rotary table type mesh filter | |
| KR101951376B1 (en) | Waste water treatment apparatus having multiple drum fillter | |
| CN218166196U (en) | Impurity shunting and filtering mechanism and sewage treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Lapsed because of non-payment of the annual fee |
Effective date: 20190901 |