EP0198496A1 - Washing machine, particularly dishwashing machine, provided with a self-cleaning filter - Google Patents

Washing machine, particularly dishwashing machine, provided with a self-cleaning filter Download PDF

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Publication number
EP0198496A1
EP0198496A1 EP86105316A EP86105316A EP0198496A1 EP 0198496 A1 EP0198496 A1 EP 0198496A1 EP 86105316 A EP86105316 A EP 86105316A EP 86105316 A EP86105316 A EP 86105316A EP 0198496 A1 EP0198496 A1 EP 0198496A1
Authority
EP
European Patent Office
Prior art keywords
filter
washing
liquid
washing machine
chambers
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Withdrawn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
EP86105316A
Other languages
German (de)
English (en)
French (fr)
Inventor
Daniele Cupani
Claudio Favot
Ingo Haberl
Sergio Tassotti
Luigi Toniolo
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.)
Electrolux Zanussi Elettrodomestici SpA
Original Assignee
Zanussi Elettrodomestici SpA
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 Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Publication of EP0198496A1 publication Critical patent/EP0198496A1/en
Withdrawn legal-status Critical Current

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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
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning

Definitions

  • the present invention relates to a dishwashing machine, in particular a domestic dishwashing machine, provided with self-cleaning filter means ' capable of filtering the washing and rinsing liquid, in or der to separate and eliminate the dirt particles, avoiding their redeposition on the articles to be washed.
  • a plurality of known washing machines i.e. dishwashing machines or laundry washing machines, are provided with filters for protecting the pumps which are provided in the hydraulic circuit, or for retaining the dirt particles removed from the articles to be wash ed.
  • the problem relating to the washing liquid filtration is particularly critic in domestic dishwash ing machines, which are generally provided with a wash ing liquid circulating pump and a discharge pump.
  • the dishwashing machines comprise a mechanical filter with relatively wide mesh grid in or der to prevent objects from passing through and damaging the pumps, and a mechanical filter with fine mesh grid in order to prevent the dirt particles from re-de positating on the articles to be washed, expecially du ring the last rinsing phase.
  • Said filters are generally located on the bottom of the washing tub and have to be manipulated by the user for periodical cleaning operations; therefore, it can be difficult to clean them up and to loca te them in the correct position.
  • said filters are often very corn plicated, easy to clog or unable to retain the very small particles suspended in the washing liquid.
  • the new system does not require any additional water consumption for its cleaning.
  • a washing machine provided with a filter comprising a filtering mass formed by granules freely placed in a container having two chambers which are freely interconnected at the area in which said filter ing mass lies when the filter is in operation.
  • the filter is connected with the hydraulic circuit of the machine between the outlet of the circulating pump and the outlet of the discharge pump.
  • the invention relates to a dishwashing machine comprising a washing tub 10, with rotary spray arms 11 and 12 therein for spraying the washing and rinsing liquid onto the arti cles, said liquid being circulated by a circulating pump 13, the intake duct of which is connected to a sump 14 provided on the bottom of the tub 10 and the delivery duct of which branches towards the spray arms.
  • the dishwashing machine is provided with a discharge pump 20 capable of sucking the washing liquid from the sump 14 and discharging it through a drain hose 21.
  • a self-cleaning filter 22 is connected with the hydraulic circuit of the machine between the outlet of the circulating pump 13 and the outlet of the discharge pump 20.
  • said partition 25 may be provided with an opening 26 adjacent to its upper end; said opening providing a by-pass for the liquid flowing thro ugh the filter.
  • the opening 26 is provided to regulate the pressure in the chamber 23 in order to avoid unwanted water discharges and to improve the performance of the filtering mass.
  • the chamber 23 is connected through a duct 30 with an outlet of the circulating pump 13; the chamber 24, on the other hand, is connected with the outlet of the discharge pump 20.
  • the filter 22 is also connected with the drain hose 21 of the machine.
  • a filter of this kind is to be integrated in machines, e.g. dishwashing and clothes washing machines, having very reduced size and provided with small internal space for housing additional de vices.
  • the filter 22 overcomes all these drawbacks simply and efficiently. It can have, in fact, very small dimensions, because only a portion of the circulated liquid flows through it.
  • said filter is continous- ly working during the operation of the pumps, i.e. du ring washing liquid circulation; therefore, the whole liquid amount is statistically filtered during the corn plete washing cycle.
  • the filtering mass is freely laid on the bottom of the filter and the by-pass in the par tition between said vertical chambers prevents the pres sure in the filter from reaching values so high as to cause the granular material to be dragged by the flowing liquid.
  • the hydraulic circuit does not need any adjusting and control means; in particular it does not require valves which are usually unreliable when dirty water flows through them.
  • the automatic cleaning is very efficient because the pressure of the water circulated in counterflow by the discharge pump is sufficient to move and mix up the filtering mass, thus removing and eliminating the dirt particles through said drain hose.
  • the filter ing mass may be configurated like a siphon-type tube, the two siphon branches of which form the vertical chambers on the bottom of which the filter ing mass is laid; in that case it is only necessary to provide a simple connecting duct between the two verti cal siphon branches to provide the. by-pass corresponding to the opening provided in the partition of the filter described above.
  • two or more series-connected filters may be provided, comprising relevant filtering masses of different granulometry; otherwise, said masses can be laid one upon the other within a same filter in order to achieve a selective filtration.
  • the filtration may be performed du ring operation of the circulating pump while the discharge pump is inoperative, or vice-versa, during the filter cleaning phase.
  • the filter cleaning phase may be performed during operation of both pumps.
  • the filter according to the invention may be provided with granules having a density value other than the washing liquid.
  • the filter should be turned upside down with reference to the drawing, that is to say, with the chamber parti tion extending from the bottom of the container to a level adjacent to its top.

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  • Detail Structures Of Washing Machines And Dryers (AREA)
EP86105316A 1985-04-18 1986-04-17 Washing machine, particularly dishwashing machine, provided with a self-cleaning filter Withdrawn EP0198496A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45713/85A IT1187278B (it) 1985-04-18 1985-04-18 Macchina lavatrice in particolare lavastoviglie,provvista di filtro autopulente
IT4571385 1985-04-18

Publications (1)

Publication Number Publication Date
EP0198496A1 true EP0198496A1 (en) 1986-10-22

Family

ID=11257552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105316A Withdrawn EP0198496A1 (en) 1985-04-18 1986-04-17 Washing machine, particularly dishwashing machine, provided with a self-cleaning filter

Country Status (2)

Country Link
EP (1) EP0198496A1 (it)
IT (1) IT1187278B (it)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5320120A (en) * 1993-06-17 1994-06-14 General Electric Company Dishwasher with dual pumps
EP0990413A1 (en) * 1998-09-29 2000-04-05 CANDY S.p.A. A method of filtering the washing and/or rinsing liquid in a dishwasher and apparatus for implementing the method
US9005369B2 (en) 2011-06-20 2015-04-14 Whirlpool Corporation Filter assembly for a dishwasher
US9010344B2 (en) 2011-06-20 2015-04-21 Whirlpool Corporation Rotating filter for a dishwashing machine
US9034112B2 (en) 2010-12-03 2015-05-19 Whirlpool Corporation Dishwasher with shared heater
US9107559B2 (en) 2011-05-16 2015-08-18 Whirlpool Corporation Dishwasher with filter assembly
US9113766B2 (en) 2010-11-16 2015-08-25 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9119515B2 (en) 2010-12-03 2015-09-01 Whirlpool Corporation Dishwasher with unitary wash module
US20150265129A1 (en) * 2009-12-21 2015-09-24 Whirlpool Corporation Automatic dishwasher with pump assembly
US9167950B2 (en) 2011-05-16 2015-10-27 Whirlpool Corporation Dishwasher with filter assembly
US9211047B2 (en) 2009-12-21 2015-12-15 Whirlpool Corporation Rotating filter for a dishwashing machine
US9237836B2 (en) 2012-05-30 2016-01-19 Whirlpool Corporation Rotating filter for a dishwasher
US9265401B2 (en) 2011-06-20 2016-02-23 Whirlpool Corporation Rotating filter for a dishwashing machine
US9301667B2 (en) 2012-02-27 2016-04-05 Whirlpool Corporation Soil chopping system for a dishwasher
US9364131B2 (en) 2010-12-13 2016-06-14 Whirlpool Corporation Rotating filter for a dishwashing machine
US9451862B2 (en) 2012-06-01 2016-09-27 Whirlpool Corporation Dishwasher with unitary wash module
US9532700B2 (en) 2012-06-01 2017-01-03 Whirlpool Corporation Dishwasher with overflow conduit
US9554688B2 (en) 2012-10-23 2017-01-31 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
US9668636B2 (en) 2010-11-16 2017-06-06 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9730570B2 (en) 2012-05-30 2017-08-15 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US9833120B2 (en) 2012-06-01 2017-12-05 Whirlpool Corporation Heating air for drying dishes in a dishwasher using an in-line wash liquid heater
US9861251B2 (en) 2011-06-20 2018-01-09 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US9918609B2 (en) 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US10653291B2 (en) 2011-06-20 2020-05-19 Whirlpool Corporation Ultra micron filter for a dishwasher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR388414A (fr) * 1908-03-21 1908-08-12 Josef Franc Filtre
US2369915A (en) * 1943-03-03 1945-02-20 Thomas H Quinn Liquid filter
US3016147A (en) * 1957-03-13 1962-01-09 Whirlpool Co Self-cleaning filter for laundry machine
FR2287887A1 (fr) * 1974-10-19 1976-05-14 Licentia Gmbh Dispositif pour la filtration de l'eau de rincage circulant dans des machines a laver la vaisselle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR388414A (fr) * 1908-03-21 1908-08-12 Josef Franc Filtre
US2369915A (en) * 1943-03-03 1945-02-20 Thomas H Quinn Liquid filter
US3016147A (en) * 1957-03-13 1962-01-09 Whirlpool Co Self-cleaning filter for laundry machine
FR2287887A1 (fr) * 1974-10-19 1976-05-14 Licentia Gmbh Dispositif pour la filtration de l'eau de rincage circulant dans des machines a laver la vaisselle

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5320120A (en) * 1993-06-17 1994-06-14 General Electric Company Dishwasher with dual pumps
EP0990413A1 (en) * 1998-09-29 2000-04-05 CANDY S.p.A. A method of filtering the washing and/or rinsing liquid in a dishwasher and apparatus for implementing the method
US20150265129A1 (en) * 2009-12-21 2015-09-24 Whirlpool Corporation Automatic dishwasher with pump assembly
US9918609B2 (en) 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US9687135B2 (en) 2009-12-21 2017-06-27 Whirlpool Corporation Automatic dishwasher with pump assembly
US10779703B2 (en) 2009-12-21 2020-09-22 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US9375129B2 (en) 2009-12-21 2016-06-28 Whirlpool Corporation Rotating filter for a dishwashing machine
US9211047B2 (en) 2009-12-21 2015-12-15 Whirlpool Corporation Rotating filter for a dishwashing machine
US9668636B2 (en) 2010-11-16 2017-06-06 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9113766B2 (en) 2010-11-16 2015-08-25 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9532697B2 (en) 2010-12-03 2017-01-03 Whirlpool Corporation Dishwasher with unitary wash module
US9119515B2 (en) 2010-12-03 2015-09-01 Whirlpool Corporation Dishwasher with unitary wash module
US9572473B2 (en) 2010-12-03 2017-02-21 Whirlpool Corporation Dishwasher with unitary wash module
US9034112B2 (en) 2010-12-03 2015-05-19 Whirlpool Corporation Dishwasher with shared heater
US9532696B2 (en) 2010-12-03 2017-01-03 Whirlpool Corporation Dishwasher with unitary wash module
US9364131B2 (en) 2010-12-13 2016-06-14 Whirlpool Corporation Rotating filter for a dishwashing machine
US9107559B2 (en) 2011-05-16 2015-08-18 Whirlpool Corporation Dishwasher with filter assembly
US9700196B2 (en) 2011-05-16 2017-07-11 Whirlpool Corporation Dishwasher with filter assembly
US9167950B2 (en) 2011-05-16 2015-10-27 Whirlpool Corporation Dishwasher with filter assembly
US11882977B2 (en) 2011-05-16 2024-01-30 Whirlpool Corporation Dishwasher with filter assembly
US9538898B2 (en) 2011-05-16 2017-01-10 Whirlpool Corporation Dishwasher with filter assembly
US10070769B2 (en) 2011-06-20 2018-09-11 Whirlpool Corporation Rotating filter for a dishwashing machine
US9265401B2 (en) 2011-06-20 2016-02-23 Whirlpool Corporation Rotating filter for a dishwashing machine
US10653291B2 (en) 2011-06-20 2020-05-19 Whirlpool Corporation Ultra micron filter for a dishwasher
US9010344B2 (en) 2011-06-20 2015-04-21 Whirlpool Corporation Rotating filter for a dishwashing machine
US10314457B2 (en) 2011-06-20 2019-06-11 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US10178939B2 (en) 2011-06-20 2019-01-15 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US10813525B2 (en) 2011-06-20 2020-10-27 Whirlpool Corporation Ultra micron filter for a dishwasher
US10058227B2 (en) 2011-06-20 2018-08-28 Whirlpool Corporation Filter assembly for a dishwasher
US9861251B2 (en) 2011-06-20 2018-01-09 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US9005369B2 (en) 2011-06-20 2015-04-14 Whirlpool Corporation Filter assembly for a dishwasher
US10058228B2 (en) 2012-02-27 2018-08-28 Whirlpool Corporation Soil chopping system for a dishwasher
US9301667B2 (en) 2012-02-27 2016-04-05 Whirlpool Corporation Soil chopping system for a dishwasher
US9237836B2 (en) 2012-05-30 2016-01-19 Whirlpool Corporation Rotating filter for a dishwasher
US10076226B2 (en) 2012-05-30 2018-09-18 Whirlpool Corporation Rotating filter for a dishwasher
US9730570B2 (en) 2012-05-30 2017-08-15 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US10376128B2 (en) 2012-05-30 2019-08-13 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US11134825B2 (en) 2012-05-30 2021-10-05 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US9833120B2 (en) 2012-06-01 2017-12-05 Whirlpool Corporation Heating air for drying dishes in a dishwasher using an in-line wash liquid heater
US9532700B2 (en) 2012-06-01 2017-01-03 Whirlpool Corporation Dishwasher with overflow conduit
US9451862B2 (en) 2012-06-01 2016-09-27 Whirlpool Corporation Dishwasher with unitary wash module
US9962060B2 (en) 2012-10-23 2018-05-08 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
US9826882B2 (en) 2012-10-23 2017-11-28 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
US9757008B2 (en) 2012-10-23 2017-09-12 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
US9649007B2 (en) 2012-10-23 2017-05-16 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter
US9554688B2 (en) 2012-10-23 2017-01-31 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter

Also Published As

Publication number Publication date
IT8545713A0 (it) 1985-04-18
IT1187278B (it) 1987-12-23
IT8545713A1 (it) 1986-10-18

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Inventor name: TASSOTTI, SERGIO

Inventor name: TONIOLO, LUIGI

Inventor name: HABERL, INGO

Inventor name: CUPANI, DANIELE

Inventor name: FAVOT, CLAUDIO