EP0990413A1 - Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine - Google Patents

Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine Download PDF

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Publication number
EP0990413A1
EP0990413A1 EP98830569A EP98830569A EP0990413A1 EP 0990413 A1 EP0990413 A1 EP 0990413A1 EP 98830569 A EP98830569 A EP 98830569A EP 98830569 A EP98830569 A EP 98830569A EP 0990413 A1 EP0990413 A1 EP 0990413A1
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EP
European Patent Office
Prior art keywords
flow
tank
washing liquid
filtering
washing
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.)
Granted
Application number
EP98830569A
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English (en)
French (fr)
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EP0990413B1 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
Original Assignee
Candy SpA
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Filing date
Publication date
Application filed by Candy SpA filed Critical Candy SpA
Priority to DE1998620625 priority Critical patent/DE69820625T2/de
Priority to EP98830569A priority patent/EP0990413B1/de
Publication of EP0990413A1 publication Critical patent/EP0990413A1/de
Application granted granted Critical
Publication of EP0990413B1 publication Critical patent/EP0990413B1/de
Anticipated expiration legal-status Critical
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    • 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
    • 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

  • the present invention relates to a method of filtering the washing liquid in a dishwasher comprising a tank for holding the items to be washed, the flow of washing liquid being drawn from the tank by a main recirculation pump drawing from the bottom of the tank and being admitted to the tank through a plurality of spray nozzles for a predetermined period of time, the flow being passed through a circuit comprising a primary screen disposed in the bottom of the tank and a perforated basket for retaining the large particles of dirt removed from the items to be washed, and through a chamber disposed beneath the primary screen, at least partially surrounding the perforated basket, and having filtering elements for retaining fine dirt particles.
  • the invention also relates to apparatus for implementing the method.
  • washing liquid is intended to define in the following description any solution with detergent for use in a dishwasher during the actual washing stages as well as the water used during the rinsing stages which take place after and between the washing stages.
  • dishwashers of the type mentioned above provide for various operating cycles to be selected by the user according to the amount of food residues present on the dishes, this definition including plates, glasses, cutlery, pots and kitchen utensils.
  • the primary screen and the perforated basket in the bottom of the tank can retain the larger particles of dirt and the other smaller particles are retained by the further filtering means commonly known as micro-filters, a quantity of finely reduced and pulverized particles continues to be recycled in the tank.
  • the entire quantity of washing liquid circulated by the main cycle pump is filtered during the working cycles as it passes from the tank to the filtering members and from these back into the tank.
  • the particles which are not retained by the filtering members therefore continue to recirculate together with the liquid during the working stages with the risk that even the fine particles retained by the filtering members may be detached therefrom and go back into circulation.
  • the object of the present invention is to provide a filtering method which as far as possible eliminates all of the residues and dirt from the washing liquid during the recycling thereof, also avoiding the risk of premature clogging of the filtering members fitted in the working circuit for the flow of washing liquid.
  • the rotors 4 and 5 are freely rotatable on respective support pillars 7 and 8, in conventional manner.
  • the bottom 9 of the tank 1 has a primary screen 10 in the centre of which there is a perforated basket 11 which can be removed manually.
  • the screen 10 and the basket 11 have respective holes through which the washing or rinsing liquid can pass and which can retain the large particles of food residues which are removed from the items during washing.
  • the apparatus In a position below the primary screen 10, the apparatus comprises a first chamber 12 which communicates axially, by means of an annular opening 13, with a further chamber which will be referred to further below.
  • a second chamber 14 is arranged concentrically with the basket 11 and with the first chamber 12.
  • the chamber 14 has a cylindrical wall 15 with an inner surface covered by a filtering element 16. This filtering element 16 blocks the passage of very tine dirt particles which would otherwise remain in suspension in the washing water.
  • the apparatus has a third chamber 17 which extends axially as far as the wall 18 constituting the base of the first chamber 12, with which the third chamber 17 communicates via the aforementioned annular opening 13.
  • connection with the wall 18 is formed, in the embodiment illustrated, by means of an annular seal 19 inserted between a collar 20 fixed to the wall 18 and an opposed collar 21 fixed to the wall 22 which constitutes the periphery of the chamber 17.
  • the third chamber 17 is connected by means of an opening 23 to the intake duct 24 of the recirculation pump 25 of which the output, not shown, supplies the nozzles 6 on the rotors 4 and 5 in known and conventional manner.
  • the base 26 of the second chamber 14 has a duct 27 which puts the chamber 14 into communication with the intake duct 28 of a pump 29 which has an output 30 and which, as will be explained below, can act as a discharge pump and, alternatively, as a further recycling pump, in the implementation of the filtration method of the present invention.
  • the base 26 also has a nozzle 31 connected permanently to the water supply coming from the water mains, by means of an on/off solenoid valve 32 disposed in a pipe 33 and controlled by the operating cycle of the dishwasher.
  • the nozzle 31 is positioned on the base 26 in a position coaxial with the chamber 14 and with the basket 11 so as to direct its jet against the cylindrical filtering surface 16 of the chamber 14 and against the basket.
  • the apparatus comprises an additional filtering member 34 having, in its interior, walls 35 with filtering elements for retaining very fine dirt particles.
  • the filtering member 34 is positioned vertically adjacent the rear wall of the tank 1 and is connected to the output 30 of the pump 29 by means of a pipe 36.
  • the outlet pipe 37 of the filtering member 34 opens directly into the tank 1 in the vicinity of the bottom 9.
  • the pipe 36 may be reversed towards the discharge as indicated schematically at 36a.
  • the result is more effective washing by the dishwasher.
  • the additional filtration step by means of the filtering member 34 may take place periodically during corresponding pauses of the main pump 25, that is, during pauses in the working cycle.
  • the pump 29 can be operated as a discharge pump and the liquid can be directed towards the end 36a of the pipe 36 opening outside the filtering member 34.
  • Clean water can advantageously be admitted to the second chamber 14 through the nozzle 31 during the discharge stage by a suitable command imparted to the solenoid valve 32 by the control cycle.
  • the jet of clean water from the nozzle 31 helps to wash the filtering elements 16 and also the basket 11 with a counter-flow.
  • the filtering member 34 in the embodiment shown in Figures 2 and 3 comprises a three-way valve 38 which enables the pipe 37a to be put into communication with the annular inner portion 39 of the member 34, where the liquid filtered by the walls 35 collects, as shown in Figure 2, or with the axial inner chamber 40, as shown in Figure 3.
  • valve 38 enables the additional filtering member 34 to be washed by a counterflow, removing the impurities retained by the filtering walls 35.
  • clean water may be admitted not only through the nozzle 31 but also directly into the filtering member 34 through an additional nozzle 41.
  • the apparatus of Figures 2 and 3 comprises a further pump 42 for discharging the washing liquid.
  • This pump is connected to the chamber 14 by an intake duct 43 via the duct 27 formed in the base 26 of the chamber 14.
  • Discharge from the dishwasher takes place through a duct 44.
  • the filtration method also comprises a step in which a portion of the flow coming from the tank 1 is drawn off by the pump 29 during the execution of a washing cycle in which the recycling pump 25 is active, and is sent, via the duct 30, to the additional filtering member 34.
  • the said portion of the flow is made to join the main flow in the chamber 17 which is directly in communication with the duct 28.
  • the filtration step performed by the pump 29 with the additional filtering member 34 may take place simultaneously with the operation of the washing cycle implemented by the pump 25, or during predetermined pauses thereof.
  • the additional filtering member is constituted by a structure comprising a primary screen 10a, a perforated basket 11a, a chamber 14a with a filtering wall 15a, with a base 26a, and ducts 27a formed therein.
  • the structure of the additional filtering member is disposed beneath the bottom 9 of the tank 1 in a position adjacent the main filtering structure associated with the primary screen 10.
  • This structure further comprises a chamber 17a which is not described further since it has characteristics similar to those of the chamber 17.
  • a nozzle 31a is provided for performing the washing and this nozzle is disposed in the base 26a.
  • the chamber 14a is put into communication with a manifold 28a which leads into the pump 29a, corresponding to the pump 29 of the embodiments described above, into which the duct 28 coming from the main filtering member also leads.
  • the output 30a of the pump 29a is connected to a three-way valve 38a which, in a first position, puts the pump into communication with a duct 37b which, in the embodiment illustrated, opens directly into the washing tank 1 in the vicinity of the bottom 9 thereof.
  • valve 38a puts the pump 29a into communication with a pipe 44a leading to the outlet, as shown in Figure 5.
  • This position of the valve 39a is used during the washing of the filters when clean water is admitted through the nozzles 31 and 31a.
  • the filtration method implemented by the apparatus of Figures 4 and 5 corresponds substantially to that implemented by the apparatus shown in Figure 1, in which the liquid coming out of the additional filtering member is admitted directly to the tank 1.
  • the result of an ability to perform washing and rinsing cycles in a dishwasher with circulating liquids which are substantially free of dirt particles in suspension is thus achieved.
EP98830569A 1998-09-29 1998-09-29 Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine Expired - Lifetime EP0990413B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1998620625 DE69820625T2 (de) 1998-09-29 1998-09-29 Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine
EP98830569A EP0990413B1 (de) 1998-09-29 1998-09-29 Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830569A EP0990413B1 (de) 1998-09-29 1998-09-29 Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine

Publications (2)

Publication Number Publication Date
EP0990413A1 true EP0990413A1 (de) 2000-04-05
EP0990413B1 EP0990413B1 (de) 2003-12-17

Family

ID=8236807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830569A Expired - Lifetime EP0990413B1 (de) 1998-09-29 1998-09-29 Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine

Country Status (2)

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EP (1) EP0990413B1 (de)
DE (1) DE69820625T2 (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159022A1 (de) * 2001-11-30 2003-06-12 Krauss Maffei Kunststofftech Verfahren zum Herstellen eines Datenträgers aus zwei Halbseiten
WO2006069830A1 (de) 2004-12-23 2006-07-06 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes haushaltsgerät und verfahren zum betreiben desselben
WO2007066968A1 (en) * 2005-12-09 2007-06-14 Lg Electronics Inc. Dish washer
EP2022385A1 (de) * 2007-08-08 2009-02-11 Electrolux Home Products Corporation N.V. Geschirrspüler
DE102007061038A1 (de) * 2007-12-18 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltsgerät
CN101325903B (zh) * 2005-12-09 2011-01-19 Lg电子株式会社 洗碗机
US8177915B2 (en) 2009-05-13 2012-05-15 Electrolux Home Products, Inc. Filtration system for a dishwasher, and associated apparatus and method
AU2011203005B2 (en) * 2007-08-08 2012-06-07 Electrolux Home Products Corporation N.V. Dishwasher
EP2468170A1 (de) * 2010-12-21 2012-06-27 Electrolux Home Products Corporation N.V. Tischplatten-Geschirrspüler
US8746461B2 (en) 2007-02-13 2014-06-10 Meiko Maschinenbau Gmbh & Co. Kg Filter for cleaning machines
US20160073851A1 (en) * 2014-09-16 2016-03-17 General Electric Company Dishwasher appliance and a method for operating the same
US20170202425A1 (en) * 2011-06-20 2017-07-20 Whirlpool Corporation Ultra micron filter for a dishwasher
CN111000515A (zh) * 2018-10-08 2020-04-14 统一品牌有限公司 流动转向器和篮框
US11576551B2 (en) 2019-04-25 2023-02-14 E.G.O. Elektro-Geraetebau Gmbh Water-conducting household appliance and method for operation thereof
US11872602B2 (en) 2018-10-08 2024-01-16 Unified Brands, Inc. Flow diverter and basket

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005008987B3 (de) * 2005-02-28 2006-06-01 Meiko Maschinenbau Gmbh & Co.Kg Mehrtankgeschirrspülmaschine mit Rückspülvorrichtung
DE102010041930A1 (de) * 2010-10-04 2012-04-05 Dürr Ecoclean GmbH Vorrichtung und Verfahren zum Analysieren von Verschmutzung
KR102379020B1 (ko) * 2013-12-31 2022-03-28 삼성전자주식회사 식기 세척기 및 그 제어방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346723A (en) * 1981-03-25 1982-08-31 Hobart Corporation Apparatus for a warewasher bypass soil collector
EP0198496A1 (de) * 1985-04-18 1986-10-22 Zanussi Elettrodomestici S.p.A. Waschmaschine, insbesondere Geschirrspülmaschine ausgerüstet mit einem selbstreinigenden Filter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970010423B1 (ko) * 1995-09-19 1997-06-26 엘지전자 주식회사 식기세척기의 오물 처리방법 및 그 장치
IT1276119B1 (it) * 1995-11-14 1997-10-24 Candy Spa Ciclo di lavaggio per macchina lavatrice

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346723A (en) * 1981-03-25 1982-08-31 Hobart Corporation Apparatus for a warewasher bypass soil collector
EP0198496A1 (de) * 1985-04-18 1986-10-22 Zanussi Elettrodomestici S.p.A. Waschmaschine, insbesondere Geschirrspülmaschine ausgerüstet mit einem selbstreinigenden Filter

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159022A1 (de) * 2001-11-30 2003-06-12 Krauss Maffei Kunststofftech Verfahren zum Herstellen eines Datenträgers aus zwei Halbseiten
WO2006069830A1 (de) 2004-12-23 2006-07-06 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes haushaltsgerät und verfahren zum betreiben desselben
US8663393B2 (en) 2004-12-23 2014-03-04 Bsh Bosch Und Siemens Hausgeraete Gmbh Water-conducting household appliance and method for the operation thereof
US7909941B2 (en) 2004-12-23 2011-03-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Water-conducting household appliance and method for the operation thereof
US8574376B2 (en) 2004-12-23 2013-11-05 Bsh Bosch Und Siemens Hausgeraete Gmbh Water-conducting household appliance and method for the operation thereof
WO2007066968A1 (en) * 2005-12-09 2007-06-14 Lg Electronics Inc. Dish washer
US8622065B2 (en) 2005-12-09 2014-01-07 Lg Electronics Inc. Dish washer
CN101325903B (zh) * 2005-12-09 2011-01-19 Lg电子株式会社 洗碗机
US8746461B2 (en) 2007-02-13 2014-06-10 Meiko Maschinenbau Gmbh & Co. Kg Filter for cleaning machines
AU2008286021B2 (en) * 2007-08-08 2011-03-24 Electrolux Home Products Corporation N.V. Dishwasher
EP2359734A1 (de) * 2007-08-08 2011-08-24 Electrolux Home Products Corporation N.V. Geschirrspüler
RU2451480C2 (ru) * 2007-08-08 2012-05-27 Электролюкс Хоум Продактс Корпорейшн Н.В. Посудомоечная машина
AU2011203005B2 (en) * 2007-08-08 2012-06-07 Electrolux Home Products Corporation N.V. Dishwasher
WO2009018903A1 (en) * 2007-08-08 2009-02-12 Electrolux Home Products Corporation N.V. Dishwasher
EP2022385A1 (de) * 2007-08-08 2009-02-11 Electrolux Home Products Corporation N.V. Geschirrspüler
CN101778590B (zh) * 2007-08-08 2013-03-06 伊莱克斯家用产品股份有限公司 洗碗机
DE102007061038B4 (de) * 2007-12-18 2016-10-27 BSH Hausgeräte GmbH Wasserführendes Haushaltsgerät
DE102007061038A1 (de) * 2007-12-18 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltsgerät
US8177915B2 (en) 2009-05-13 2012-05-15 Electrolux Home Products, Inc. Filtration system for a dishwasher, and associated apparatus and method
US9775488B2 (en) 2010-12-21 2017-10-03 Electrolux Home Products Corporation N.V. Table top dishwasher
EP2468170A1 (de) * 2010-12-21 2012-06-27 Electrolux Home Products Corporation N.V. Tischplatten-Geschirrspüler
WO2012085002A2 (en) 2010-12-21 2012-06-28 Electrolux Home Products Corporation N.V. Table top dishwasher
US10813525B2 (en) * 2011-06-20 2020-10-27 Whirlpool Corporation Ultra micron filter for a dishwasher
US20170202425A1 (en) * 2011-06-20 2017-07-20 Whirlpool Corporation Ultra micron filter for a dishwasher
US9968236B2 (en) * 2014-09-16 2018-05-15 Haier Us Appliance Solutions, Inc. Dishwasher appliance and a method for operating the same
US20160073851A1 (en) * 2014-09-16 2016-03-17 General Electric Company Dishwasher appliance and a method for operating the same
CN111000515A (zh) * 2018-10-08 2020-04-14 统一品牌有限公司 流动转向器和篮框
US11872602B2 (en) 2018-10-08 2024-01-16 Unified Brands, Inc. Flow diverter and basket
CN111000515B (zh) * 2018-10-08 2024-03-19 统一品牌有限公司 流动转向器和篮框
US11576551B2 (en) 2019-04-25 2023-02-14 E.G.O. Elektro-Geraetebau Gmbh Water-conducting household appliance and method for operation thereof

Also Published As

Publication number Publication date
DE69820625D1 (de) 2004-01-29
EP0990413B1 (de) 2003-12-17
DE69820625T2 (de) 2004-11-11

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