WO1991008700A1 - Filtre pour lave-vaisselle - Google Patents

Filtre pour lave-vaisselle Download PDF

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Publication number
WO1991008700A1
WO1991008700A1 PCT/AU1990/000591 AU9000591W WO9108700A1 WO 1991008700 A1 WO1991008700 A1 WO 1991008700A1 AU 9000591 W AU9000591 W AU 9000591W WO 9108700 A1 WO9108700 A1 WO 9108700A1
Authority
WO
WIPO (PCT)
Prior art keywords
dishwasher
screen arrangement
sump
screen
floor
Prior art date
Application number
PCT/AU1990/000591
Other languages
English (en)
Inventor
John Duncan Mcnair
Original Assignee
Vulcan Australia Limited
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 Vulcan Australia Limited filed Critical Vulcan Australia Limited
Publication of WO1991008700A1 publication Critical patent/WO1991008700A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4206—Tubular filters

Definitions

  • This invention relates to a screen assembly for use in dishwashing machines.
  • Widely used known dishwashers generally have a closabie wash chamber in which dishes to be washed are placed in racks.
  • a rotatable spray arm directs water at high velocity through several small openings in the spray arm to clean the dishes.
  • the wash water carries food residue to the bottom of the machine where coarse particles are caught in a cup-like strainer and fine particles caught on a finely perforated substantially flat screen.
  • the fiat screen covers and generally encloses a sump, which is generally a tray-like structure extending across at least a substantial part of the base area of the chamber.
  • the finely perforated screen covers the top of the sump and mates as closely as possible with a location ledge around the edges of the sump.
  • Food residue or other objects which can be on the screen or adjacent to it can be inadvertently spilled into the sump area during removal of the screen for cleaning. Residual water in the sump area hides the presence of these objects and they are often not removed before the machine is used again.
  • Such objects which may include small pieces of broken glass or china, small bones or small utensils, can then go through the pump and hydraulic system causing damage and blockages.
  • the present invention of a screen arrangement for a dishwasher seeks to overcome the abovementioned problems. Summary of the Invention.
  • the invention consists of a removable screen arrangement for a dishwasher, the dishwasher being provided with a water pump and spraying system for removing food residues from articles to be washed and a tray like sump having a floor and walls for collecting the water and residues and wherein the screen arrangement comprises a hollow enclosure at least one finely perforated surface of which is configured to closely overlie a substantial proportion of said floor of the sump whilst being substantially uniformly spaced apart from it and wherein said finely perforated surface has formed on it spigot means to engage with a tube projecting upwardly from and fixed to the floor of the sump to engage with and locate said screen arrangement and wherein said tube forms a liquid communication between the interior of said hollow enclosure and an intake of said pump.
  • said hollow enclosure comprises one domed and one dished member, joined at their edges wherein the dished member is finely perforated.
  • the domed member is not perforated.
  • the spigot means is formed to closely fit the outside surface of the uppermost end of said tube.
  • the tube is finely perforated near its intersection with the floor of the sump.
  • the tube has at its top a coarse screen completely covering the end communicating with the interior of the hollow enclosure.
  • the sump has a separate outlet formed in the floor leading to a drainage means.
  • the outlet to the drainage means is provided with a strainer for trapping coarse objects.
  • the separate outlet to a drainage means is completely surrounded by a low weir projecting upwardly from the floor of the sump.
  • the strainer locates on the uppermost surface of the weir.
  • Figure 1 is a schematic cross-section to reduced scale of a screen assembly according to the invention.
  • a dishwasher filter is shown housed in a sump 10 which is located generally towards the bottom of a dishwashing machine (not illustrated) in which dishes and the like to be cleaned are held in racks above the sump.
  • a removable filter unit being a hollow enclosure 11 comprising a domed top plate 12 and a finely perforated dished bottom screen 14, sealed together around their mating peripheries by any suitable means such as clips or welding.
  • the enclosure 11 is mounted low in the sump 10 with a gap between its periphery and the sump.
  • the enclosure 11 is located a short distance above the floor 18 of the sump at the top of a short upstanding pipe 20 protruding through an opening in the sump floor 18.
  • An opening formed in the bottom screen 14 is formed to have a downwardly ⁇ irected spigot 19 to form a push-on fit onto the top end of the pipe 20.
  • the open lower end 22 of the pipe 20 is connected to a pump (not shown) which circulates water through the washing chamber during washing cycles via rotatable spray arms (not shown), thence by gravity to the sump.
  • the top end of the pipe 20 is fitted with a coarse screen 24.
  • the floor 18 of the sump has a second opening surrounded by a weir 26 in which is located a closely fitting coarse strainer 28 the opening being connected to a pump used for pumping water to the drain (not shown) at the end of the machine cycle.
  • the strainer 28 is removable by hand for periodic cleaning.
  • food residue removed by washing from the dishes (not shown), including particulate residue is carried by the wash water into the bottom of the sump 10.
  • Water borne residue is prevented from entering the circulation pump by firstly being prevented from passing to the interior of the enclosure by contact with the bottom screen 14.
  • Cap screen 24 provides a means of catching any objects which may enter pipe 20 whilst the screen is removed.
  • Cap screen 24 by being domed or of upwardly pitched-to-centre shape tends to shed any hard particles or large objects away from the pump inlet even if the dishwasher were to be incorrectly used without the hollow enclosure 11 portion of the filter in place.
  • Weir 26 surrounding the drain hole is capable of preventing hard heavy particles such as broken glass from passing into the drain outlet and hence the draining pump, since such particles are too heavy to be suspended in the water and carried over the weir 26.
  • spigot 19 can be formed in any suitable shape, ideally circular, to mate with pipe 20, its manufacture is simple and it is not subject to problems of distortion or otherwise difficult fit-up of known filters.
  • Domed top plate 12 may preferably have no perforations in which case the rood residue (which is normally unsightly by being visible adhering to the fine perforated filter at the bottom of the washing chamber in known dishwashing machines) is not visible.
  • domed top plate 12 may optionally be finely perforated, in which case the surface area of the filter may be substantially enlarged for given overall dimensions.
  • Waterborne particles drawn against the bottom screen 14 by the suction of the circulation pump during the wash cycle may fall off due to gravity during the drain cycle. This useful effect is further assisted by an inherent backwashing action of the filter since water in the filter enclosure 11 will run back into the sump at the conclusion of the wash and rinse cycles.
  • a further backwash effect may be achieved by providing an inlet which introduces clean water (when required for wash and rinse cycles) into the machine through the filter enclosure, either through pipe 20 or through a second spigot (not illustrated) in the bottom screen 14.
  • the surfaces of the finely perforated screen 14 may be rippled or ridged to discourage particles of food residue sticking to the screen or plate due to the formation of a film of water between the residue and the screen surface.
  • the upstanding pipe 20 and weir 26 may be perforated at the level of the sump floor 18 to encourage complete draining of the sump when the machine is not in use. This facilitates the cleaning of the sump at the time of cleaning the filter unit and hence the avoidance of decomposition of food residue in the sump, so avoiding the machine's washing chamber developing unpleasant odours if left unused for a period of some days.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Abstract

Un dispositif de filtrage amovible pour lave-vaisselle possédant une chambre de lavage fermée à son extrémité inférieure par une cuve (10) pourvue d'un plancher (18). Le dispositif de filtrage comprend une enveloppe creuse (11) montée dans la partie basse de la cuve et soutenue par un tuyau court (20) relié à son extrémité inférieure à une pompe de circulation. L'enveloppe creuse est finement perforée sur au moins la majeure partie de sa paroi inférieure (14). L'eau de lavage pendant le cycle de lavage est aspirée vers le haut depuis le dessous de l'enveloppe creuse à travers lefiltre et, de là, vers l'entrée de la pompe. Le dispositif consist en un mouvement de va-et-vient sur le sommet du tuyau (20) s'emboîtant à l'aide d'un manchon (19). Ainsi le système de filtrage peut se retirer instantanément pour nettoyage mais, en utilisation, les particules alimentaires filtrées ne sont jamais visibles à l'intérieur de la chambre de lavage.
PCT/AU1990/000591 1989-12-20 1990-12-17 Filtre pour lave-vaisselle WO1991008700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ791189 1989-12-20
AUPJ7911 1989-12-20

Publications (1)

Publication Number Publication Date
WO1991008700A1 true WO1991008700A1 (fr) 1991-06-27

Family

ID=3774421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000591 WO1991008700A1 (fr) 1989-12-20 1990-12-17 Filtre pour lave-vaisselle

Country Status (1)

Country Link
WO (1) WO1991008700A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140060590A1 (en) * 2010-12-24 2014-03-06 Nasir Efe Aras Dishwasher comprising a storage tank

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703434A1 (de) * 1977-01-28 1978-08-03 Licentia Gmbh Einrichtung an geschirrspuelmaschinen zum filtern des spuelwassers
FR2412296A1 (fr) * 1977-12-23 1979-07-20 Licentia Gmbh Lave-vaisselle
GB2096456A (en) * 1981-04-10 1982-10-20 Bosch Siemens Hausgeraete Dishwashing machine sump filter
AU8288382A (en) * 1981-05-13 1982-11-18 Smeg Elettrodomestici S.P.A. Dishwashing machine tank well
EP0068974A1 (fr) * 1981-06-30 1983-01-05 Esswein S.A. Lave vaisselle à filtre de recyclage automatiquement nettoyé
GB2161699A (en) * 1984-07-19 1986-01-22 Bosch Siemens Hausgeraete Filter arrangement in a dishwashing machine
DE3507229A1 (de) * 1985-03-01 1986-09-04 Miele & Cie GmbH & Co, 4830 Gütersloh Einrichtung an geschirrspuelmaschinen zum filtern des umgewaelzten spuelwassers
EP0222306A1 (fr) * 1985-11-13 1987-05-20 INDUSTRIE ZANUSSI S.p.A. Machine à laver la vaisselle avec filtre de recirculation auto-nettoyant
GB2200834A (en) * 1987-02-06 1988-08-17 Zanussi A Spa Industrie Dishwasher with filter cleaning arrangement
GB2225224A (en) * 1988-11-23 1990-05-30 Zanussi A Spa Industrie Dishwashing machine with filter cleaning arrangement
DE3842640A1 (de) * 1988-12-18 1990-06-21 Hobart Ag Einrichtung zum waschen und nachspuelen von geschirr in einer geschirrspuelmaschine
EP0378980A2 (fr) * 1989-01-11 1990-07-25 Aktiebolaget Electrolux Dispositif pour un lave-vaisselle

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703434A1 (de) * 1977-01-28 1978-08-03 Licentia Gmbh Einrichtung an geschirrspuelmaschinen zum filtern des spuelwassers
FR2412296A1 (fr) * 1977-12-23 1979-07-20 Licentia Gmbh Lave-vaisselle
GB2096456A (en) * 1981-04-10 1982-10-20 Bosch Siemens Hausgeraete Dishwashing machine sump filter
AU8288382A (en) * 1981-05-13 1982-11-18 Smeg Elettrodomestici S.P.A. Dishwashing machine tank well
EP0068974A1 (fr) * 1981-06-30 1983-01-05 Esswein S.A. Lave vaisselle à filtre de recyclage automatiquement nettoyé
GB2161699A (en) * 1984-07-19 1986-01-22 Bosch Siemens Hausgeraete Filter arrangement in a dishwashing machine
DE3507229A1 (de) * 1985-03-01 1986-09-04 Miele & Cie GmbH & Co, 4830 Gütersloh Einrichtung an geschirrspuelmaschinen zum filtern des umgewaelzten spuelwassers
EP0222306A1 (fr) * 1985-11-13 1987-05-20 INDUSTRIE ZANUSSI S.p.A. Machine à laver la vaisselle avec filtre de recirculation auto-nettoyant
GB2200834A (en) * 1987-02-06 1988-08-17 Zanussi A Spa Industrie Dishwasher with filter cleaning arrangement
GB2225224A (en) * 1988-11-23 1990-05-30 Zanussi A Spa Industrie Dishwashing machine with filter cleaning arrangement
DE3842640A1 (de) * 1988-12-18 1990-06-21 Hobart Ag Einrichtung zum waschen und nachspuelen von geschirr in einer geschirrspuelmaschine
EP0378980A2 (fr) * 1989-01-11 1990-07-25 Aktiebolaget Electrolux Dispositif pour un lave-vaisselle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140060590A1 (en) * 2010-12-24 2014-03-06 Nasir Efe Aras Dishwasher comprising a storage tank
US9192281B2 (en) * 2010-12-24 2015-11-24 Arcelik Anonim Sirketi Dishwasher comprising a storage tank

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