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WO2007096837A2 - Filtre a eau - Google Patents

Filtre a eau Download PDF

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Publication number
WO2007096837A2
WO2007096837A2 PCT/IB2007/050584 IB2007050584W WO2007096837A2 WO 2007096837 A2 WO2007096837 A2 WO 2007096837A2 IB 2007050584 W IB2007050584 W IB 2007050584W WO 2007096837 A2 WO2007096837 A2 WO 2007096837A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter
lateral
collector
water
tank
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.)
Ceased
Application number
PCT/IB2007/050584
Other languages
English (en)
Other versions
WO2007096837A3 (fr
Inventor
Siobhan Sandra Beauchamp
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2007096837A2 publication Critical patent/WO2007096837A2/fr
Publication of WO2007096837A3 publication Critical patent/WO2007096837A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/14—Downward filtration, the container having distribution or collection headers or pervious conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/42—Nature of the water, waste water, sewage or sludge to be treated from bathing facilities, e.g. swimming pools

Definitions

  • THIS INVENTION relates to a water filter.
  • the invention relates particularly to a water filter that uses sand as a filter medium and that is used for filtering swimming pool water.
  • a known filter of the type includes a tank that operatively contains such sand. The filter is operatively connected in line with a pipe line, a pump, and a swimming pool in a configuration providing for the pump to circulate water in the pool through the filter and the pool.
  • the filter typically has an inlet assembly including an inlet pipe that terminates in a diffuser near the operative top of the tank.
  • the filter has also an outlet assembly including an outlet pipe that originates from a collector in an operative bottom region of the tank.
  • water enters the tank via the inlet pipe and the diffuser, flows through the filter sand, is collected by the collector, and exits the tank via the outlet pipe.
  • the collector typically is spread out generally horizontally across the said operative bottom region with the aim of inducing a substantially even flow of water, and thus effective filtering of the water, through the sand contained in the tank, i.e. from the top to the bottom of the tank.
  • the collector of a known water filter of the type includes a plurality of straight perforated tube sections, known as laterals, that project radially from a central hollow hub of the collector and that communicate, via the hub, with the outlet pipe of the filter.
  • laterals are substantially "evenly perforated” along their lengths
  • water flowing through sand, operatively contained in the tank within which the tube sections are located will follow a path through the sand towards the laterals, entering the laterals mainly through perforations on the operative top side of the tube sections.
  • the sand will tend to form "dead pockets" between adjacent laterals in the region level with and below the laterals, i.e. areas through which water being filtered does not flow.
  • the potential filtering efficiency of the filter is thus detrimentally affected, while hardening of the sand within the tank, particularly below the tube sections, can also result.
  • any reference hereinafter to a filter must be interpreted as a reference to a water filter of the general type referred to above for filtering swimming pool water, which uses sand as a filter medium.
  • water filter which includes, defined in an upright orientation thereof,
  • a tank that defines an enclosed space therein for containing sand as a filter medium
  • a water inlet assembly which defines therethrough a water flow passage between an external inlet of the filter and an inlet of the tank in a top region of the tank; and a water outlet assembly which includes
  • a water collector in an operative bottom region of the tank including a central hollow hub and a plurality of laterals, extending radially from the hub and in a circumferentially spaced arrangement about the hub, each lateral including a length of tubing that defines a loop and that defines a plurality of openings through its wall that permit water flow from the space defined in the tank into the collector, in use of the filter; and
  • the filter is operatively connected in line with a pipe line, a pump, and a swimming pool in a configuration providing for the pump to circulate water in the pool through the filter and the pool.
  • the water inlet assembly typically includes an inlet pipe that terminates in a diffuser near the operative top of the tank, the diffuser defining the inlet of the tank of the filter.
  • a water collector as herein envisaged including laterals defining loops, may be configured to yield a more even distribution of the laterals throughout sand in the bottom region of a tank of a water filter than is possible with a water collector including only straight laterals.
  • the loops of a collector as herein envisaged define the extremities of the laterals remote from the hub and where the loops are disposed at least near horizontal.
  • the potential for dead pockets, as referred to above, to form in the sand is minimized.
  • the sum of the flow cross-sectional areas of openings on the underside of each lateral may exceed the sum of the flow cross-sectional areas of openings on the top side of the lateral by at least 50%. It is envisaged that this may direct water flow more towards the sand in the region underneath the collector, minimizing the potential for the formation of dead pockets, as referred to above, in the sand between and underneath the laterals.
  • Each lateral may include both a length of tubing defining a stem that projects laterally from the hub and the length of tubing defining the loop, the lateral bifurcating from the stem into the loop.
  • the distribution of the openings defined through the wall of each lateral may be such as to yield a substantially even flow of water through the sand in the tank of the filter throughout a horizontal cross-section above the collector, in use of the filter.
  • the openings defined by the laterals may include transverse slits.
  • each lateral may be corrugated.
  • the slits of the lateral may include slits that are disposed in outer crests of the corrugation.
  • the slits of the lateral may include slits that are disposed in outer valleys of the corrugation.
  • the width of the slits will be such as to operatively prevent filter sand from entering the collector through the slits.
  • Each slit may be tapered in cross-section, its sides converging towards the outside of the lateral by which it is defined.
  • a water collector for location in an operative bottom region of a tank of a water filter that operatively contains sand as a filter medium, which includes a central hollow hub and a plurality of laterals, extending radially from the hub and in a circumferentially spaced arrangement about the hub, each lateral including a length of tubing that defines a loop and that defines a plurality of openings through its wall to operatively permit water flow from the space defined in a tank of a filter of which the collector operatively forms a part into the collector, in use of the filter.
  • the sum of the flow cross-sectional areas of openings on the operative underside of each lateral may exceed the sum of the flow cross-sectional areas of openings on the operative top side of the lateral by at least 50%.
  • Each lateral may include both a length of tubing defining a stem that projects laterally from the hub and the length of tubing defining the loop, the lateral bifurcating from the stem into the loop.
  • each lateral may be such as to, in use of a filter of which the collector operatively forms a part, yield a substantially even flow of water through sand in the tank of the filter throughout a horizontal cross-section above the collector.
  • the openings defined by the laterals may include transverse slits.
  • each lateral may be corrugated.
  • the slits of the lateral may include slits that are disposed in outer crests of the corrugation.
  • the slits of the lateral may include slits that are disposed in outer valleys of the corrugation.
  • the width of the slits will be such as to operatively prevent filter sand from entering the collector through the slits.
  • Each slit may be tapered in cross-section, its sides converging towards the outside of the lateral by which it is defined.
  • Figure 1 shows a diagrammatic sectional elevation of an embodiment of a water filter, in accordance with the first aspect of the invention, incorporating an embodiment of a water collector, in accordance with the second aspect of the invention;
  • Figure 2 shows a diagrammatic top view of the water collector of Figure 1 ;
  • Figure 3 shows a diagrammatic detailed three-dimensional view of a part of a wall of a lateral of the water collector of Figure 2;
  • Figure 4 shows a diagrammatic sectional elevation of the filter of Figure 1 during a filtration cycle thereof.
  • Figure 5 shows a diagrammatic sectional elevation of the filter of Figure 1 during a backwash cycle thereof.
  • a water filter which is suitable for filtering swimming pool water and which uses sand as a filter medium is designated generally by the reference numeral 10.
  • the filter 10 includes a tank 12 that is made up of two tank halves 14.
  • the tank halves 14 are injection moulded bodies of a reinforced synthetic plastic material, typically an engineering polymer known in the trade as PPGF30, which is glass loaded.
  • the tank halves 14 define peripheral flanges 16 where they abut one another, the halves being secured together by heat welding.
  • the top tank half 14 defines at its top centre an access opening 22 and has a closure 24 for the opening removably secured thereto. With the closure 24 in place, it seals off the opening 22 so that an enclosed internal space 26 is defined in the tank 12. The tank 12 can then withstand internal pressures which are generated during operation of the filter 10.
  • the filter 10 includes also a water inlet assembly 28 which includes a coupling 30, mounted on a wall of the top tank half 14 and extending through a hole defined through the wall, an elbow pipe 32, and a diffuser 34.
  • the assembly 28 defines therethrough a water flow passage 36 between an inlet 38 of the filter 10 and a plurality of outlets 40 defined by the diffuser 34, serving as inlets of the tank 12.
  • the assembly 28 may be essentially conventional, it is not described in more detail herein.
  • the filter 10 includes also a water outlet assembly 42 which includes a water collector 44, an outlet pipe 46, and a coupling 48, mounted on a wall of the bottom tank half 14 and extending through a hole defined through the wall.
  • the outlet pipe 46 defines an outlet 49 of the filter 10.
  • the collector 44 includes a central hollow hub 50 located in the centre of the tank 12 near its bottom and six identical laterals 52 extending radially from the hub and in a circumferentially spaced arrangement about the hub. In Figure 2, the collector 44, including the hub 50 and six laterals 52, are shown in top view.
  • Each lateral 52 includes both a length of tubing 54 defining a stem that projects laterally from the hub 50 and a length of tubing 56 defining a substantially triangular loop, the lateral bifurcating from the stem into the loop.
  • Each length of tubing 54 defines a socket 58 within which a complementary spigot (not shown) forming a part of the hub 50 is received.
  • Each spigot and the corresponding socket define complementary bayonet-type engagement formations via which the corresponding lateral is detachably attached to the hub 50.
  • water flow passages defined in the lengths of tubing 54 and 56 are in communication with the inside of the hub 50 and a flow passage 60 (see Figure 1 ) defined in the pipe 46.
  • each length of tubing 54 extending therefrom limits the number of laterals that can extend from the hub 50.
  • the looped configurations of the lengths of tubing 56 ensure that the collector 44 is essentially more evenly distributed throughout the sand in the bottom region of the tank 12 (see Figure 1 ) than would be the case with six straight laterals projecting from the hub 50.
  • each lateral 52 is corrugated along the major part of the length of its tubing 54 and 56.
  • Figure 3 shows a sectional view of a part of a wall 62 of one of the laterals 52.
  • the wall being corrugated, defines outer peaks 64, outer valleys 66, and corresponding inner valleys and peaks, respectively.
  • the wall 62 defines openings in the form of slits 68 via which the space 26 (see Figure 1 ) defined in the tank 12 (see Figure 1 ) communicates with the passage defined inside the lateral 52, here designated by the reference numeral 70.
  • the configuration of the wall 62 is such that each slit 68 is defined by an inner valley 72 which tapers inwardly towards the outside of the wall. As such, each slit 68 is tapered in cross- section.
  • Each slit 68 has a width of approximately 0.14mm, which is such that typical sand used as a filter medium in the tank 12 (see Figure 1 ) is not permitted to pass through the slit into the passage 70.
  • the distribution of the slits 68 is such that approximately 50% more flow cross-sectional area of slit is provided on the underside of the lateral 52 than on its top side. The purpose of this aspect of the distribution of the slits 68 will be described hereinafter along with another aspect of their distribution.
  • the slits 68 within the laterals 52 may be distributed in an arrangement that induces substantially equal flow into the laterals across the entire area covered by the laterals. It is envisaged that, for example, the concentration of slits in regions on the laterals 52 remote from the hub 54 will be higher than in regions nearer the hub. Insofar as an arrangement of slits suitable for achieving such substantially even flow may be determined by experimentation, it is not elaborated on in detail herein.
  • the filter 10 will have a filtering efficiency that is superior to that of known filters, providing for cleaner swimming pool water, while also reducing the frequency with which the filter needs to be backwashed for cleaning. By reducing the frequency of required backwashing, the use of the filter 10 will also be associated with significant water savings.
  • Figure 5 illustrates the flow direction of water through the filter 10 during a backwash cycle, which is essentially the reverse of the flow direction during a filtration cycle and which is indicated by the arrows in the drawing.
  • the configuration of the water collector 44 in this cycle will ensure the effective movement of sand 74 particularly below the collector, thus reducing the possibility of hardening of sand within the tank 12 and ensuring effective cleaning of the sand.
  • the configuration of the water collector 44 further ensures a substantially even flow of water upwardly through the sand 74 to ensure that the entire mass of sand is effectively cleaned during backwashing.
  • the pressure of water exiting the slits is increased during backwashing, thus ensuring that any compacted regions of sand below the collector 44, notably in the outer valleys 66, are effectively cleared during backwashing.
  • the various features of the filter of the invention are greatly variable, particularly also in relation to the design of the water collector and particularly the laterals thereof which, in accordance with the invention, maximizes the effective coverage of the cross-sectional area of the tank and provide for even flow of water through the mass of sand, thus ensuring that the entire mass of sand is effectively used for filtering purposes.
  • the effective area covered thereby is approximately 2.8 times greater than that covered by a conventional collector including straight laterals extending from a hub thereof.
  • the second aspect of the invention covers a water collector as defined herein, perse, of which the water collector 44 is an example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Hydraulic Turbines (AREA)

Abstract

L'invention concerne un filtre à eau comprenant une cuve qui, en fonctionnement, contient du sable de filtration à travers lequel de l'eau est pompée afin de filtrer l'eau. Le filtre comprend un collecteur dans une région inférieure de la cuve. Le collecteur comprend un moyeu central creux et une pluralité d'éléments latéraux s'étendant radialement à partir du moyeu et selon une disposition espacée circonférentiellement autour du moyeu. Chaque élément latéral comprend une longueur de conduite définissant une tige qui fait saillie latéralement à partir du moyeu et une longueur de conduite définissant une boucle, l'élément latéral bifurquant de la tige dans la boucle. Chaque longueur de conduite définit une pluralité d'ouvertures à travers sa paroi permettant à de l'eau de s'écouler de l'intérieur de la cuve dans le collecteur pendant l'utilisation du filtre. L'invention concerne également à un tel collecteur.
PCT/IB2007/050584 2006-02-23 2007-02-23 Filtre a eau Ceased WO2007096837A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2006/01605 2006-02-23
ZA200601605 2006-02-23

Publications (2)

Publication Number Publication Date
WO2007096837A2 true WO2007096837A2 (fr) 2007-08-30
WO2007096837A3 WO2007096837A3 (fr) 2007-11-15

Family

ID=38255335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/050584 Ceased WO2007096837A2 (fr) 2006-02-23 2007-02-23 Filtre a eau

Country Status (1)

Country Link
WO (1) WO2007096837A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248570A1 (fr) * 2009-05-07 2010-11-10 Steinbach VertriebsgmbH Dispositif de traitement de l'eau de piscine
KR101022339B1 (ko) * 2010-06-15 2011-03-22 주식회사 아스테코 수처리용 여과기
ITMC20110040A1 (it) * 2011-07-22 2013-01-23 Ecoverde Srl Dispositivo per il trattamento acque in vasca
CN106512496A (zh) * 2016-12-03 2017-03-22 赵有生 扇面负荷集水器
IT201600102569A1 (it) * 2016-10-12 2018-04-12 Filippo Bussinelli Gruppo di filtraggio o purificazione di acqua
WO2025029839A3 (fr) * 2023-07-31 2025-04-17 Johnson Screens, Inc. Ensemble moyeu et rayons latéraux pour cuve de fluide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747768A (en) * 1972-05-09 1973-07-24 Wilkes Pool Corp Filter unit and filtrate collector therefor
US4200536A (en) * 1978-08-22 1980-04-29 Samuel Kaufman Underdrain for filter tanks
US4622137A (en) * 1985-11-13 1986-11-11 Emerich Kessler Filtering system for swimming pools, with removable manifold assembly and braided filter grid units
US6569328B1 (en) * 2000-11-02 2003-05-27 Gary D. Haggard Underdrain filtration system with stamped perforations
GB2380951C (en) * 2001-10-18 2011-09-28 Derek Colin Tolley Filtration of liquid media

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248570A1 (fr) * 2009-05-07 2010-11-10 Steinbach VertriebsgmbH Dispositif de traitement de l'eau de piscine
KR101022339B1 (ko) * 2010-06-15 2011-03-22 주식회사 아스테코 수처리용 여과기
ITMC20110040A1 (it) * 2011-07-22 2013-01-23 Ecoverde Srl Dispositivo per il trattamento acque in vasca
IT201600102569A1 (it) * 2016-10-12 2018-04-12 Filippo Bussinelli Gruppo di filtraggio o purificazione di acqua
CN106512496A (zh) * 2016-12-03 2017-03-22 赵有生 扇面负荷集水器
WO2025029839A3 (fr) * 2023-07-31 2025-04-17 Johnson Screens, Inc. Ensemble moyeu et rayons latéraux pour cuve de fluide

Also Published As

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