EP2213217A1 - Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle - Google Patents

Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle Download PDF

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Publication number
EP2213217A1
EP2213217A1 EP09001205A EP09001205A EP2213217A1 EP 2213217 A1 EP2213217 A1 EP 2213217A1 EP 09001205 A EP09001205 A EP 09001205A EP 09001205 A EP09001205 A EP 09001205A EP 2213217 A1 EP2213217 A1 EP 2213217A1
Authority
EP
European Patent Office
Prior art keywords
sump
filter
tub
pump
dishwasher
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Withdrawn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
EP09001205A
Other languages
German (de)
English (en)
Inventor
Winfried Steiner
Rolf Stahlmann
Stefan Fueglein
Reinhard Merz
Klaus Martin Forst
Thomas Frerich
Hansjörg Lampe
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 Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP09001205A priority Critical patent/EP2213217A1/fr
Publication of EP2213217A1 publication Critical patent/EP2213217A1/fr
Withdrawn legal-status Critical Current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
    • A47L15/4244—Water-level measuring or regulating arrangements
    • 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
    • A47L15/4204—Flat filters
    • 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 dishwasher comprising a tub, a sump located between said tub, and a filter provided between said tub, and a filter provided between said tub and said sump.
  • the present invention also relates to a method for cleaning a filter provided between a tub and a sump of a dishwasher.
  • Known dishwashers comprise a washing tub in which usually one or two horizontal shelves are provided to hold the dishes to be washed, wherein within the tub a plurality of spraying nozzles or spraying rotors are provided to direct a washing liquid towards the dishes.
  • the washing liquid i.e. water and detergent
  • the filter elements In order to achieve an efficient operation of the dishwasher, the filter elements have to be cleaned from soil particles so as to prevent clogging of the filters.
  • a dishwasher which also comprises a shallow funnel-shaped filtering plate at the bottom of the tub, which filtering plate merges into a cylindrical filter element, which acts as collector for soil and dirt particles washed off the dishes.
  • a cylindrical filter element which acts as collector for soil and dirt particles washed off the dishes.
  • an atomizing spraying nozzle Inside the cylindrical filter element there is provided an atomizing spraying nozzle by means of which water can be sprayed onto the cylindrical filter so as to remove soil that has collected on the vertical walls of the filter.
  • the present invention thus provides for a method for cleaning a filter provided between a tub and a sump of a dishwasher, in which method the sump temporarily is flooded to a level above the filter so as to lift off matter that has accumulated on the filter, whereupon the sump is drained, i.e. water is pumped out of the sump either to be recirculated to the spraying nozzles or to be withdrawn to waste, so that the water level in the sump area is lowered to a level below the filter, so as to flush away matter which prior to flooding the sump had accumulated on the filter.
  • By flooding the sump in this manner it is possible to lift off matter from the entire filter elements, that is particularly also from any shallow filter elements that are provided at the bottom of the tub at the interface between tub and sump.
  • the said temporary flooding of the sump is effected by withdrawing washing liquid from the sump and passing said washing liquid back into the sump.
  • the flooding of the sump is effected by using the washing liquid that already is present in the tub and during a regular washing cycle is circulated through the tub and the sub.
  • the washing liquid employed for the temporary flooding of the sump can be diverted from a liquid circulation cycle by which washing liquid which has been passed into the tub and which has accumulated in the sump is reintroduced into the tub via a plurality of spraying nozzles.
  • part or all of the washing liquid is used to raise the water level within the sump so as to lift off matter such as food residues or other soiling that have accumulated on the filter elements and particularly on the shallow funnel-shaped flatfilter provided at the interface between tub and sump.
  • no washing liquid is passed to the spraying nozzles so that the entire washing liquid that is drained from the sump by a circulation pump which supplies the spraying nozzles within the tub is reintroduced into the sump, so as to achieve a high reverse flow into the sump so as to provide for a quick and effective cleaning of the filter.
  • the temporary flooding of the sump can be integrated into the regular washing cycle by effecting the flooding periodically at fixed time intervals.
  • the degree of soiling of the filter is detected and, based upon such detection, the temporary flooding of the sump is effected.
  • the above mentioned object is solved by a dishwasher as it is defined in claim 8.
  • the present invention provides for a dishwasher comprising a tub, a sump located below the tub, and a filter provided between the tub and the sump, wherein the dishwasher further comprises means for temporarily flooding the sump, so as to lift-off and remove matter that has accumulated on the filter.
  • the dishwasher preferably comprises a plurality of spraying nozzles provided within the tub, a fluid circulation assembly comprising a pump, means for passing liquid from within the sump to the pump and from the pump to the spraying nozzles.
  • a fluid circulation assembly comprising a pump, means for passing liquid from within the sump to the pump and from the pump to the spraying nozzles.
  • the switching means can be adapted to direct the entire flow from the pump to either only the spraying nozzles or to only the sump so as to provide for a large reverse flow into the sump for flooding the same, the switching means could also be adapted to divide the flow from the pump into a first portion that is passed to the spraying nozzles and a second portion that is passed to the sump.
  • the simultaneous operation of one or more of the spray arms provided within the tub creates a flow which diverts the upward flow through the holes of the filter to a more horizontal direction towards the drain of the sump, where any dirt particles present in the washing liquid are trapped and from which the washing liquid is sucked into either the inlet of the circulation pump to be recirculated to the spraying nozzles or, during flooding of the sump, to the sump, or is drained by a drain pump to a waste disposal line.
  • flooding of the sump preferably is achieved by means of the circulation pump which is used for circulating washing liquid collected in the sump to the spraying nozzles provided within the tub
  • a separate feed pump can be provided to pass liquid into the sump for temporary flooding thereof.
  • the feed pump preferably is connected to the inlet of the circulation pump.
  • the flooding of the sump can be effected either periodically or, preferably, in dependency of the degree of soiling of the filter.
  • the degree of soiling of the filter can be detected by means of sensors which detect a decrease in flow rate through the filter as it is caused by soiling or clogging. This can be achieved, for example, by the provision of a sensor which measured the water level within the sump, which will decrease when the filter element between the tub and the sump is clogged and hence less water is able to flow into the sump.
  • the water level could be detected, for example, by optical sensors or by pressure sensors, in particular, by an analogue pressure sensor.
  • clogging of the filter could also be detected by means of a sensor which detects the water flow or the pressure downstream the circulation pump.
  • clogging of the filter could be determined by detecting operation parameters of the circulation pump, such as speed, rotational frequency, power input, current drain etc.
  • the removal of dirt particles or other soiling from the shallow filter element between the tub and the sump as it is achieved in accordance with the present invention by the uplifting motion of the water level within the sump can be assisted by supplying the washing liquid for flooding the sump through a plurality of nozzles that are located below the filter and which preferably are positioned directly underneath the filter, so as to inject the washing liquid with a higher momentum into the sump in a plurality of liquid jets which impinge on the lower side of the filter element.
  • Fig. 1 shows the lower part of a dishwasher in accordance with the present invention in the region of the sump 10 that is provided below the tub 12, which in the usual manner can be provided with slideable baskets for holding dishes to be cleaned an in which a number of rotating spray arms is mounted to feed washing liquid into the tub and onto the dishes to be cleaned.
  • a liquid circulation pump 14 is connected with its inlet or sucking side to a drain 16 provided in a lower section of the sump 10.
  • the bottom of tub 12 is generally funnel-shaped so that washing liquid which has been sprayed onto the dishes and drops down therefrom or flows downward along the walls of the tub is guided towards the central region of the bottom of the tub which merges into sump 10.
  • a flat filter element 18 in the shape of a shallow funnel.
  • funnel-shaped filter element 18 merges into a cylindrical dirt trap 20 which comprises a course filter 22 and a microfilter 24 and from which spent washing can be drained to a waste water disposal line, as will be further explained below.
  • water is supplied into the sump through a fresh water inlet 26 which is connected to a water supply.
  • water is sucked from sump 10 via inlet 16 into pump 14 and is passed into a first supply line 28 which feeds a lower spray arm within tub 12 as well as into a second supply line 30 which feeds an upper spray arm provided within tub 12.
  • Water dripping down from the dishes again collects at the bottom of the tub, flows towards the centre of the tub along the slanted surfaces of the bottom 32 of the tub as well as along and through the slanted surfaces of the filter element 18 and into sump 10, either by flowing through the holes of filter element 18 or by flowing along the upper side of filter element 18 and downwards into dirt trap 20.
  • Fig. 2 is an illustration of the dishwasher shown in Fig. 1 in which a switching element 38 which in Fig. 1 is shown in a first position, in which the switching element 38 blocks the inlet of a line 40 which is provided between pump 14 and supply lines 28 and 30, is displaced into a second position ( Fig. 2 ) so as to block supply lines 28 and 30 and to divert the entire flow leaving circulation pump 14 into line 40 which directs the washing liquid back into sump 10.
  • the water level within the sump 10 raises to a level 42 which is above filter element 18 so as to lift-off dirt particles 34 from filter 18 so that these dirt particles can be drained into dirt trap 20 when the sump is drained by switching the switching element 38 into the position shown in Fig. 1 .
  • the dirt particles 34 that are passed into the dirt trap 20 either can be collected therefrom after termination of a cleaning cycle or they can be drained and removed from the system at the end of a cleaning cycle by activating a drain pump (not shown) which is connected to a drain pipe 44 connected at the bottom section of sump 10.
  • switching element 38 could also be adapted to assume, in addition to the two positions shown in Fig. 1 and 2 , one or more intermediate positions, so as to divide the exit flow from pump 14 into a first portion which feeds the upper and lower spray arms through supply lines 28 and 30 as well as into a second portion which feeds return line 40.
  • Activation of the switching element 38 can be effected by the controller that controls also the further elements of the dishwasher such as the water supply system and the heating system for heating the washing liquid, wherein the switch 38 can be activated either at fixed intervals within the cleaning cycle, or at variable time intervals in dependency of a soiling detection of filter 18.
  • FIGs. 1 and 2 show an embodiment which, apart from an adaptation of the control scheme, requires only minimum hardware redesign in order to be implemented in known dishwasher systems, namely merely the provision of return line 40 and of switching element 38, it should be appreciated that the flooding of sump 10 could also be effected by a separate feed pump (not shown) and/or with the assistance of spraying nozzles that are positioned underneath filter element 18 so as to direct water jets onto filter element 18 so as to lift-off dirt particles or other soiling which adheres to the filter.

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  • Washing And Drying Of Tableware (AREA)
EP09001205A 2009-01-29 2009-01-29 Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle Withdrawn EP2213217A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09001205A EP2213217A1 (fr) 2009-01-29 2009-01-29 Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09001205A EP2213217A1 (fr) 2009-01-29 2009-01-29 Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle

Publications (1)

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EP2213217A1 true EP2213217A1 (fr) 2010-08-04

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EP09001205A Withdrawn EP2213217A1 (fr) 2009-01-29 2009-01-29 Lave-vaisselle et procédé de nettoyage d'un filtre fourni entre un tube et un collecteur de lave-vaisselle

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101016293B1 (ko) 2009-03-20 2011-02-22 엘지전자 주식회사 세탁물 처리기기
WO2014071981A1 (fr) * 2012-11-08 2014-05-15 Electrolux Home Products Corporation N. V. Détection d'obstruction de filtre
US20160073851A1 (en) * 2014-09-16 2016-03-17 General Electric Company Dishwasher appliance and a method for operating the same
US10244919B2 (en) 2012-11-08 2019-04-02 Electrolux Home Products Corporation N.V. Detecting operational state of a dishwasher
CN110074736A (zh) * 2018-01-25 2019-08-02 坎迪股份公司 餐具清洗机、自动评价过滤系统的洁净程度的方法和系统
EP3545813A1 (fr) * 2018-03-27 2019-10-02 Miele & Cie. KG Lave-vaisselle, en particulier lave-vaisselle électroménager
US10595703B2 (en) 2015-11-10 2020-03-24 Electrolux Appliances Aktiebolag Method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods, and appliance and computer program therewith
US10786137B2 (en) 2015-11-25 2020-09-29 Electrolux Appliances Aktiebolag Determining whether process water has been added to a sump of an appliance for washing and rinsing goods during interruption of appliance operation
US11019979B2 (en) 2016-02-15 2021-06-01 Electrolux Appliances Aktiebolag Process water flow detection in circulation pump
US11141039B2 (en) 2017-02-24 2021-10-12 Electrolux Appliances Aktiebolag Dishwasher, method and control system for handling clogging condition
US11805960B2 (en) 2021-03-23 2023-11-07 Midea Group Co., Ltd. Dishwashing appliance with shrouded filtration assembly

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090391A (en) * 1961-02-02 1963-05-21 Maytag Co Dishwasher self cleaning arrangement
DE3723721A1 (de) * 1986-11-13 1988-05-26 Candy Elettrodomestici Verfahren fuer den betrieb einer waschmaschine, insbesondere einer geschirrspuelmaschine, und nach einem solchen verfahren arbeitende waschmaschine
EP0374009B1 (fr) 1988-12-16 1994-06-08 Esswein S.A. Procédé de lavage de la vaisselle et lave-vaiselle mettant en oeuvre ce procédé
US5909743A (en) * 1997-09-10 1999-06-08 Whirlpool Corporation Automatic purge filtration system for a dishwasher
EP0774230B1 (fr) 1995-11-14 2001-09-05 CANDY S.p.A. Cycle de lavage pour machine à laver
US20020074026A1 (en) * 2000-12-14 2002-06-20 Lg Electronics, Inc. Dishwasher
EP1386575A1 (fr) * 2002-07-31 2004-02-04 CANDY S.p.A. Lave-vaisselle avec filtre broyeur mis en rotation par le flux du liquide de lavage
DE10244243A1 (de) 2002-09-24 2004-03-25 Aweco Appliance Systems Gmbh & Co. Kg Haushaltsmaschine
EP1882438A1 (fr) * 2006-07-28 2008-01-30 Miele & Cie. KG Procédé destiné à la réalisation d'un programme de nettoyage avec une phase de nettoyage d'un filtre

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090391A (en) * 1961-02-02 1963-05-21 Maytag Co Dishwasher self cleaning arrangement
DE3723721A1 (de) * 1986-11-13 1988-05-26 Candy Elettrodomestici Verfahren fuer den betrieb einer waschmaschine, insbesondere einer geschirrspuelmaschine, und nach einem solchen verfahren arbeitende waschmaschine
EP0374009B1 (fr) 1988-12-16 1994-06-08 Esswein S.A. Procédé de lavage de la vaisselle et lave-vaiselle mettant en oeuvre ce procédé
EP0774230B1 (fr) 1995-11-14 2001-09-05 CANDY S.p.A. Cycle de lavage pour machine à laver
US5909743A (en) * 1997-09-10 1999-06-08 Whirlpool Corporation Automatic purge filtration system for a dishwasher
US20020074026A1 (en) * 2000-12-14 2002-06-20 Lg Electronics, Inc. Dishwasher
EP1386575A1 (fr) * 2002-07-31 2004-02-04 CANDY S.p.A. Lave-vaisselle avec filtre broyeur mis en rotation par le flux du liquide de lavage
DE10244243A1 (de) 2002-09-24 2004-03-25 Aweco Appliance Systems Gmbh & Co. Kg Haushaltsmaschine
EP1882438A1 (fr) * 2006-07-28 2008-01-30 Miele & Cie. KG Procédé destiné à la réalisation d'un programme de nettoyage avec une phase de nettoyage d'un filtre

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101016293B1 (ko) 2009-03-20 2011-02-22 엘지전자 주식회사 세탁물 처리기기
CN104768441B (zh) * 2012-11-08 2018-07-03 伊莱克斯家用产品公司 检测过滤器堵塞
WO2014071981A1 (fr) * 2012-11-08 2014-05-15 Electrolux Home Products Corporation N. V. Détection d'obstruction de filtre
CN104768441A (zh) * 2012-11-08 2015-07-08 伊莱克斯家用产品公司 检测过滤器堵塞
US9872597B2 (en) 2012-11-08 2018-01-23 Electrolux Home Products Corporation N.V. Detecting filter clogging
US10244919B2 (en) 2012-11-08 2019-04-02 Electrolux Home Products Corporation N.V. Detecting operational state of a dishwasher
US20160073851A1 (en) * 2014-09-16 2016-03-17 General Electric Company Dishwasher appliance and a method for operating the same
US9968236B2 (en) * 2014-09-16 2018-05-15 Haier Us Appliance Solutions, Inc. Dishwasher appliance and a method for operating the same
US10595703B2 (en) 2015-11-10 2020-03-24 Electrolux Appliances Aktiebolag Method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods, and appliance and computer program therewith
US10786137B2 (en) 2015-11-25 2020-09-29 Electrolux Appliances Aktiebolag Determining whether process water has been added to a sump of an appliance for washing and rinsing goods during interruption of appliance operation
US11019979B2 (en) 2016-02-15 2021-06-01 Electrolux Appliances Aktiebolag Process water flow detection in circulation pump
US11141039B2 (en) 2017-02-24 2021-10-12 Electrolux Appliances Aktiebolag Dishwasher, method and control system for handling clogging condition
CN110074736A (zh) * 2018-01-25 2019-08-02 坎迪股份公司 餐具清洗机、自动评价过滤系统的洁净程度的方法和系统
EP3545813A1 (fr) * 2018-03-27 2019-10-02 Miele & Cie. KG Lave-vaisselle, en particulier lave-vaisselle électroménager
US11805960B2 (en) 2021-03-23 2023-11-07 Midea Group Co., Ltd. Dishwashing appliance with shrouded filtration assembly

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