EP0101458A1 - Self cleaning filter - Google Patents

Self cleaning filter

Info

Publication number
EP0101458A1
EP0101458A1 EP83900613A EP83900613A EP0101458A1 EP 0101458 A1 EP0101458 A1 EP 0101458A1 EP 83900613 A EP83900613 A EP 83900613A EP 83900613 A EP83900613 A EP 83900613A EP 0101458 A1 EP0101458 A1 EP 0101458A1
Authority
EP
European Patent Office
Prior art keywords
filter
turbine
brush
tubular element
self cleaning
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.)
Withdrawn
Application number
EP83900613A
Other languages
German (de)
French (fr)
Inventor
Alfred Denholm Tucker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ris Irrigation Systems Pty Ltd
Original Assignee
Ris Irrigation Systems Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ris Irrigation Systems Pty Ltd filed Critical Ris Irrigation Systems Pty Ltd
Publication of EP0101458A1 publication Critical patent/EP0101458A1/en
Withdrawn legal-status Critical Current

Links

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
    • B01D29/117—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 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
    • B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—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 multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—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 multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • 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
    • B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
    • B01D29/6415—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes with a rotary movement with respect to 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
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/682—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/58—Power supply means for regenerating the filter
    • B01D2201/583—Power supply means for regenerating the filter using the kinetic energy of the fluid circulating in the filtering device

Definitions

  • This invention relates to a self cleaning filter such as may be used in an irrigation system.
  • U.S. Patent No. 4060483 discloses a method and apparatus for effecting the cleaning of a fluid filter by a hollow filter cleaning body having an inlet situated in close proximity to the filter member, the flow of water through the cleaning body causing movement of the cleaning body, the cleaning water then flowing through an exhaust port.
  • a self cleaning filter unit having a liquid inlet and a liquid outlet, a filtering member disposed between said filter inlet and filter outlet, an exhaust outlet, means disposed within said filter unit for
  • FIG. 1 is a longitudinal cross-sectional view 25. of the invention, the filter cleaning element not being sectioned, and
  • FIG. 2 is a cross-section on the lines 2-2 of FIG. 1 on an enlarged scale
  • the filter unit can comprise a generally cylindrical casing 1 having an inlet 2 and socket 3 toward one end and 5. an outlet 4 and socket 5 toward the other end. Within the casing there is disposed a cylindrical filter element 6, the element being mounted in rings 7 which are sealed by sealing members 8 to the interior of the cylindrical casing 1.
  • the cylindrical filter element 6 is mounted in rings 7 which are sealed by sealing members 8 to the interior of the cylindrical casing 1.
  • element 6 is positioned such that the fluid will flow in through the inlet 2 into the interior of the casing at that end and then through the interior of the filter 6, and after passing through the filter element 6 is discharged through the outlet port 4.
  • the inlet flows from the inlet 2 through a course prefilter portion 6a into the interior of the filter 6.
  • the cylindrical casing 1 at the inlet end is closed by an end cap 9 provided with suitable
  • sealing rings 10 the cap being maintained in position by a longitudinal rod 11 passing through the filter unit to be secured to the end cap 12 at the outlet end of the filter unit.
  • This second end cap is provided with an exhaust outlet 13 and sealing rings 10, with
  • the rod 11 supporting on a bush 14 and thrust bearing 15, a water turbine 16 between the end cap 12 and the adjacent ring 7.
  • the water turbine 16 has two arms 17 extending radially, each arm having an aperture 28 so that the water is discharged tangentially to 30. cause the turbine to rotate.
  • the hollow member 17 surrounding said rod and extending through the filter element and supported on the rod 11 by a bush 18 at the ring 7 adjacent the inlet 2 to the casing 1.
  • the hollow member 17 is shaped to have a portion 19 adjacent to the inner surface of the filter 6, where the member 17 is provided with a series of slits, 5. holes or apertures 20.
  • the hollow member 17 is also provided with a longitudinal brush element 21 pivoted from the hollow element by suitable arms 22 or the like. The brush element is adapted to contact the interior of the filter element during the cleaning 10. of the filtered material therefrom.
  • the arms 22 are pivoted in brackets 30 attached by screws 31 to the hollow element 17, the brackets 30 having an upstanding flange 32, the arms 22 passing through holes in the flange 32 in a pivotal manner. 15.
  • a spring 33 having legs 34 attached to the brush
  • a drive housing 23 surrounds the turbine 16, 20. and has a radial wall 24 and a sealing ring 25 to seal the turbine drive area from the filter area except through the hollow member 17.
  • the exhaust 13 can be provided with a suitable flow control, and in normal operation of the filter
  • the brush is pivoted to the cleaning element so that it protrudes away from the cleaning element and is biassed by the spring to the retracted position away from the filter element when the filter element is not being cleaned. This is to ensure that the
  • the resistance of the spring is such that it 25. holds the brush in the retracted position, but when the hollow element is rotated, the resistance to movement created by the water causes the brush to pivot into contact with the filter element against the bias of the spring.
  • the spring tension is adjusted so that this occurs, with the spring returning the brush to its retracted position when rotation ceases.
  • the hollow element may have a plurality of apertures therein to allow the water to flow there- 5. through, or could have a longitudinal slit or plurality of slits, which slits can be positioned in relation to the filter and the brush so that as the element and brush rotate the disturbed filtered material and debris would immediately be swept through the 10. slit.
  • the control of the filter unit by the valve positioned in the exhaust aperture or in the exhaust line can be manually operated or alternatively be con ⁇ trolled automatically either by sensing the back 15. pressure in the filter, or alternatively be controlled by a timer or some other control such as the quantity of water which has passed through the filter.
  • valve One suitable form of valve is that s'hown in Australian Patent No. -5-08284 entitled “Automatic 20. Filter Backwash Control”.
  • the filter element with its sealing rings and the hollow member and the turbine can be readily assembled into the outer cylindrical casing through the ends of the cylindrical casing and are retained 25. in positon by the longitudinal rod and the end caps. It will be realised that various forms of water turbines can be provided, that is being either the reaction or impulse type and either operated by way of the use of curved vanes or jets or the like.

Abstract

Un filtre à auto-nettoyage possède un élément creux (17) relié par l'intermédiaire d'une turbine (16) à un orifice d'échappement réglable (13). Le fluide s'écoule dans le filtre (6) et sort au travers de l'orifice de sortie (5) et lors de l'écoulement du fluide au travers de l'échappement (13), la turbine (16) fait tourner l'élément creux (17), des passages de fluide (20) reliant l'extérieur du filtre (6) à l'intérieur de l'élément creux (17). L'élément creux (17) possède un balai pivotant (21) qui se déplace en contact avec le filtre (6), lors de la rotation de l'élément (17) à la suite de la résistance fluide agissant sur le balai (21).A self-cleaning filter has a hollow member (17) connected via a turbine (16) to an adjustable exhaust port (13). The fluid flows through the filter (6) and exits through the outlet orifice (5) and when the fluid flows through the exhaust (13), the turbine (16) rotates the 'hollow element (17), fluid passages (20) connecting the outside of the filter (6) inside the hollow element (17). The hollow element (17) has a pivoting brush (21) which moves in contact with the filter (6), during the rotation of the element (17) following the fluid resistance acting on the brush (21 ).

Description

Λ SELF CLEANING FILTER "
This invention relates to a self cleaning filter such as may be used in an irrigation system.
Background of the Invention
5 With the advent of irrigation systems where the irrigation water is sprayed through small nozzles, or where the -irrigation is carried out by drip irrigation, it is essential that the water be filtered before passing to the spray nozzles or drip units
10. otherwise these would readily clog with the particles carried in suspension in the water. Thus it is necessary that filter units be supplied and that some way be provided for effectively cleaning -these filter units. While it is known that filter units
15 can be dismantled and manually cleaned or replaced, this procedure is not entirely satisfactory.
Also filtering units are known where a reverse flow can flush the collected filtered material from the filter, this being flushed through an exhaust 20. port. However these re-ty solely on the flow of water and thus an effective cleaning is not always carried out. An example of this has applied to a cartridge of particulate filter medium is shown in Australian Patent No. 420747.
25. U.S. Patent No. 4060483 discloses a method and apparatus for effecting the cleaning of a fluid filter by a hollow filter cleaning body having an inlet situated in close proximity to the filter member, the flow of water through the cleaning body causing movement of the cleaning body, the cleaning water then flowing through an exhaust port.
Brief Description of the Invention
5. Thus there is provided according to the invention a self cleaning filter unit, the unit having a liquid inlet and a liquid outlet, a filtering member disposed between said filter inlet and filter outlet, an exhaust outlet, means disposed within said filter unit for
10. moving a filter cleaning element over said filter element to remove filtered material therefrom, brush means pivoted to said filter cleaning element, and means driving said filter cleaning element responsive to flow of fluid from said filter cleaning element
15. through said exhaust, said rotation causing said brush means to contact said filtering member by resistance of water thereon to disturb said filtered material which is passed out of the filter unit through said exhaust.
20. Brief Description of the Drawings
In order to more fully describe the invention, reference will now be made to the accompanying drawings in which:
FIG. 1 is a longitudinal cross-sectional view 25. of the invention, the filter cleaning element not being sectioned, and
FIG. 2 is a cross-section on the lines 2-2 of FIG. 1 on an enlarged scale, Description of -the Preferred Embodiment
In a preferred form of the invention the filter unit can comprise a generally cylindrical casing 1 having an inlet 2 and socket 3 toward one end and 5. an outlet 4 and socket 5 toward the other end. Within the casing there is disposed a cylindrical filter element 6, the element being mounted in rings 7 which are sealed by sealing members 8 to the interior of the cylindrical casing 1. The cylindrical filter
10. element 6 is positioned such that the fluid will flow in through the inlet 2 into the interior of the casing at that end and then through the interior of the filter 6, and after passing through the filter element 6 is discharged through the outlet port 4.
15. The inlet flows from the inlet 2 through a course prefilter portion 6a into the interior of the filter 6.
The cylindrical casing 1 at the inlet end is closed by an end cap 9 provided with suitable
20. sealing rings 10, the cap being maintained in position by a longitudinal rod 11 passing through the filter unit to be secured to the end cap 12 at the outlet end of the filter unit. This second end cap is provided with an exhaust outlet 13 and sealing rings 10, with
25. the rod 11 supporting on a bush 14 and thrust bearing 15, a water turbine 16 between the end cap 12 and the adjacent ring 7. The water turbine 16 has two arms 17 extending radially, each arm having an aperture 28 so that the water is discharged tangentially to 30. cause the turbine to rotate. This water turbine
16 is connected to a hollow filter cleaning member
17 surrounding said rod and extending through the filter element and supported on the rod 11 by a bush 18 at the ring 7 adjacent the inlet 2 to the casing 1. The hollow member 17 is shaped to have a portion 19 adjacent to the inner surface of the filter 6, where the member 17 is provided with a series of slits, 5. holes or apertures 20. The hollow member 17 is also provided with a longitudinal brush element 21 pivoted from the hollow element by suitable arms 22 or the like. The brush element is adapted to contact the interior of the filter element during the cleaning 10. of the filtered material therefrom.
The arms 22 are pivoted in brackets 30 attached by screws 31 to the hollow element 17, the brackets 30 having an upstanding flange 32, the arms 22 passing through holes in the flange 32 in a pivotal manner. 15. A spring 33 having legs 34 attached to the brush
21, has its other leg 35 in contact with the hollow element 17, the spring 33 biassing the brush element 21 away from the filter element 6.
A drive housing 23 surrounds the turbine 16, 20. and has a radial wall 24 and a sealing ring 25 to seal the turbine drive area from the filter area except through the hollow member 17.
The exhaust 13 can be provided with a suitable flow control, and in normal operation of the filter
25. device this exhaust valve is closed so that the water will flow from the inlet 2 through the interior of the filter element 6 and to the outlet port 4. At this time also the hollow element 17 and the turbine 16 will be filled with water. The thrust bearing
30. 15 crries a disc 26 to help break up the turbulence from the turbine and allow the water to flow through the exhaust.
Oi Pl However on opening the exhaust port fluid will flow from the interior of the filter element through the hollow member and through the water turbine to drive the turbine to rotate the hollow 5. element with the brush attached thereto so that the brush then sweeps over the interior of the filter element, the resistance of the water on the brush causing the brush to pivot to contact the filter element. The flow of water as it passes- into the 10. hollow element, through the slots will carry with it the debris and filtered material which has been removed from the filter element by the brush and this material is then discharged to waste through the exhaust port.
_, _ The brush is pivoted to the cleaning element so that it protrudes away from the cleaning element and is biassed by the spring to the retracted position away from the filter element when the filter element is not being cleaned. This is to ensure that the
20. brush does not rest in contact with the surface of the cleaning element while it is stationary for there is a tendency for- the brush to become stuck and adhered to the element by accumulated debris.
The resistance of the spring is such that it 25. holds the brush in the retracted position, but when the hollow element is rotated, the resistance to movement created by the water causes the brush to pivot into contact with the filter element against the bias of the spring. The spring tension is adjusted so that this occurs, with the spring returning the brush to its retracted position when rotation ceases.
The hollow element may have a plurality of apertures therein to allow the water to flow there- 5. through, or could have a longitudinal slit or plurality of slits, which slits can be positioned in relation to the filter and the brush so that as the element and brush rotate the disturbed filtered material and debris would immediately be swept through the 10. slit.
The control of the filter unit by the valve positioned in the exhaust aperture or in the exhaust line can be manually operated or alternatively be con¬ trolled automatically either by sensing the back 15. pressure in the filter, or alternatively be controlled by a timer or some other control such as the quantity of water which has passed through the filter.
One suitable form of valve is that s'hown in Australian Patent No. -5-08284 entitled "Automatic 20. Filter Backwash Control".
The filter element with its sealing rings and the hollow member and the turbine can be readily assembled into the outer cylindrical casing through the ends of the cylindrical casing and are retained 25. in positon by the longitudinal rod and the end caps. It will be realised that various forms of water turbines can be provided, that is being either the reaction or impulse type and either operated by way of the use of curved vanes or jets or the like.
c It will be seen that by the action of the brush passing over the filter element that this readily disturbs the collected material therefrom, this not only being suspended particles being carried by the water, but also any accumulated algae or 10. slime or the like which tends to collect on these components. The brush then disturbs these filtered materials and these are then easily carried away by the flow through the exhaust port.
This can be carried out during the normal operation 15. of the filter or alternatively the flow through the outlet port can be stopped during the filter cleaning operation but in normal practice the cleaning would take place during the normal operation of the filter.
20. Although one form of the invention has been described in some detail it is to be realised that the invention is not to be limited thereto but can include various modifications falling within the spirit and scope of the invention.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:-
1. A self cleaning filter unit, said unit comprising a cylindrical housing, an inlet at one end of said housing and an outlet at said other end, a circular filter element supported by sealing rings 5 engaging the interior of said housing, characterised by a tubular element supported on a rod extending through said housing and connected to a turbine an exhaust outlet in an end cap adjacent said turbine, a brush element pivoted to said tubular element, 0 said brush being biassed to a retracted position spaced from said filter element. Said tubular element having passages opening into the interior of said tubular element whereby fluid can flow through said inlet into the interior of said filter element through
25^ said filter to said outlet, and when said exhaust is open, fluid flows from the interior of said filter element through said openings into the tubular element to said turbine which rotates said tubular element causing said brush element to pivot to be in contact
20. with said filter element by resistance of the fluid on said brush element to .disturb debris which flows with the water through said openings to exhaust.
2. A self cleaning filter element as defined in Claim 1, further characterised in that said brush extends longitudinally of the tubular element, and protrudes from the tubular element in the retracted
5_ position, spring means connected to said brush element and acting on said tubular element, said brush means being mounted on arms pivoted in brackets on said tubular element.
OMPI _
WlPθ mm
3. A self cleaning filter unit as defined in Claim 1 further characterised in that said turbine is mounted in a drive housing having a radial wall adjacent the adjacent sealing ring, a further seal sealing said radial wall to said tubular member, said tubular member having a hollow portion passing through said further sealing ring and connected to said turbine.
4. A self cleaning filter unit as defined in Claim 3 further characterised in that said turbine has a pair of hollow radial arms, a tangential aperture in each arm through which water will pass to cause
5. the turbine to rotate.
5. A self cleaning filter unit as defined in Claim 1 further characterised in that said turbine is spaced from the adjacent end cap by a thrust bush carrying a circular baffle.
6. A self cleaning filter unit substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
OMPI
EP83900613A 1982-02-12 1983-02-14 Self cleaning filter Withdrawn EP0101458A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2687/82 1982-02-12
AUPF268782 1982-02-12

Publications (1)

Publication Number Publication Date
EP0101458A1 true EP0101458A1 (en) 1984-02-29

Family

ID=3769358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83900613A Withdrawn EP0101458A1 (en) 1982-02-12 1983-02-14 Self cleaning filter

Country Status (3)

Country Link
EP (1) EP0101458A1 (en)
AU (1) AU1222083A (en)
WO (1) WO1983002732A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3900390C1 (en) * 1989-01-09 1990-05-03 Arthur Schlaginhaufen Ing., Rothrist, Ch
GB2247187B (en) * 1990-08-24 1994-04-27 Chen Tsong Hae Liquid filter assembly
IT1254636B (en) * 1992-02-20 1995-09-28 Comer Spa EQUIPMENT TO FILTER PATINA OR FIBROUS SUSPENSIONS IN GENERAL
DE4318759A1 (en) * 1993-06-05 1994-12-08 Alexander Dipl In Muehlhaeuser Device for cleaning pipes
DE10115188B4 (en) * 2001-03-27 2005-08-04 Perma-Trade Wassertechnik Gmbh backwash filter
JP6267163B2 (en) * 2015-08-21 2018-01-24 ワシノ機器株式会社 Strainer with cleaning function

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975899A (en) * 1957-04-16 1961-03-21 Bird Machine Co Screening device
US3056501A (en) * 1959-08-03 1962-10-02 Gen Motors Corp Transmission oil filter assemblage
US3363759A (en) * 1964-04-29 1968-01-16 Bird Machine Co Screening apparatus with rotary pulsing member
IT981326B (en) * 1972-05-05 1974-10-10 August Kluber Apparatebau Und SELF-CLEANING FILTER
IL47305A (en) * 1975-05-14 1978-07-31 Filtomat Water Filters For Agr Method and apparatus for effecting the cleaning of a fluid filter
DE2752906A1 (en) * 1977-11-26 1979-05-31 Holstein & Kappert Maschf METHOD AND APPARATUS FOR CLEANING CLEAR FILTER ELEMENTS ARRANGED WITHIN A BOILER FILTER
IL56045A0 (en) * 1978-11-26 1979-01-31 Gilead Gideon Self cleaning screen filter
AU7727681A (en) * 1980-11-13 1982-06-07 Ris Irrigation Systems Pty. Ltd. Self cleaning filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8302732A1 *

Also Published As

Publication number Publication date
AU1222083A (en) 1983-08-25
WO1983002732A1 (en) 1983-08-18

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19831006

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Designated state(s): FR GB

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18W Application withdrawn

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Inventor name: TUCKER, ALFRED DENHOLM