EP2425758A1 - Dishwasher and method for operating a dishwasher - Google Patents

Dishwasher and method for operating a dishwasher Download PDF

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Publication number
EP2425758A1
EP2425758A1 EP10175310A EP10175310A EP2425758A1 EP 2425758 A1 EP2425758 A1 EP 2425758A1 EP 10175310 A EP10175310 A EP 10175310A EP 10175310 A EP10175310 A EP 10175310A EP 2425758 A1 EP2425758 A1 EP 2425758A1
Authority
EP
European Patent Office
Prior art keywords
temperature
washing liquid
washing
spray arm
liquid
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Withdrawn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
EP10175310A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hansjörg Lampe
Stefan Füglein
Gerhard Haider
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 EP10175310A priority Critical patent/EP2425758A1/en
Priority to PCT/EP2011/065180 priority patent/WO2012028710A1/en
Priority to EP11752539.4A priority patent/EP2611348B1/en
Priority to PL11752539.4T priority patent/PL2611348T3/pl
Publication of EP2425758A1 publication Critical patent/EP2425758A1/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Withdrawn legal-status Critical Current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
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/04—Water pressure or flow rate
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/20—Spray nozzles or spray arms

Definitions

  • the present invention relates to a dishwasher and a method for operating a dishwasher.
  • EP 1 132 038 B1 describes a household dishwashing machine comprising a control system, a washing chamber, wherein at least a first and a second basket are housed, for containing the crockery to be washed, a hydraulic circuit, comprising at least a first and a second liquid sprayer, a pump, a first supply branch for said first sprayer and a second supply branch for said second sprayer, where in order to wash the crockery said pump provides for forcing liquid from the bottom of said tub into said supply branches, for causing a respective liquid flow to exit from each of said sprayers, detergent spraying means, liquid heating means, adjusting means of the amount of liquid forced by said pump into said supply branches, a manually operable selecting means, for selecting the type of crockery contained in said first basket and in said second basket, said selecting means being connected with said control system with information being indicative of the type of crockery contained in said first basket and in said second basket, the control means which, at least during a phase of an operating cycle of the machine, controls
  • An object of the present invention is to provide a dishwasher and a method for operating a dishwasher which can be charged with heavy duty dishes and delicate dishes at the same washing cycle and which provides an acceptable cleaning result as well as convenient operation by a user.
  • a dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, further comprising a washing liquid circulation system distributing washing liquid within the washing chamber by means of an upper spray arm and a lower spray arm and having at least one pump for supplying washing liquid to both spray arms and further comprising liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature T 1 and to a second temperature T 2 , wherein the first temperature T 1 is lower than the second temperature T 2 , and wherein the washing liquid circulation system stops the supply of the washing liquid to the upper spray arm when the washing liquid temperature exceeds the first temperature T 1 .
  • At least one upper spray arm and at least one lower spray arm each of that being substantially related to one of the respective baskets are provided.
  • Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
  • the washing liquid is heated up to at least a first temperature T 1 in a main washing phase and to a second temperature T 2 in a rinse phase and/or the main washing phase comprises the steps
  • the temperature of the washing load in the upper basket increases similarly as in the lower basket when the supply of the washing liquid to the upper spray arm is stopped.
  • the temperature of the washing liquid is reduced by substituting hot washing liquid with fresh liquid which allows to treat the delicate washing load more softly.
  • the temperatures of the washing liquid are adapted to the respective detergent.
  • the wash load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Direct contact of washing liquid and delicate washing load is prevented in the case that the washing liquid comprises very high temperatures or temperatures effecting aggressive to the surfaces of the delicate washing load.
  • the temperature range of 45°C to 50°C is adapted to the activity of the enzyme component of the detergent.
  • the second temperature of 65°C or higher is adapted for cleaning heavy duty dishes which are arranged in the lower basket.
  • the dishwasher comprises a pump for circulating the washing liquid and wherein the pump speed is increased after the supply of the washing liquid to the upper spray arm was stopped and/or that the pressure with which the washing liquid is distributed by the spray arms is low when the washing liquid temperature is below the first temperature T 1 and that it is high in the main wash phase when the washing liquid temperature exceeds the first temperature T 1 and that it is low in the rinse phase even though the washing liquid temperature exceeds the first temperature T 1 .
  • the increase of the pump speed allows to treat the heavy duty dishes more powerful e.g. mechanically while the more delicate washing load is not treated aggressive. Further the pressure with which the washing liquid is distributed by the spray arms is adapted and/or adjusted to the washing liquid temperature. Therefore delicate washing load and in particular the surface of the delicate washing load is treated very softly.
  • a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
  • the object of the invention can be solved by a method for operating a dishwasher according to the present invention wherein the dishwasher comprises a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, wherein the washing liquid is distributed within the washing chamber by means of an upper spray arm and a lower spray arm and wherein the washing liquid is supplied to both spray arms by means of at least one pump, wherein the washing liquid is heated up at least to a first temperature T 1 and to a second temperature T 2 , wherein the first temperature T 1 is lower than the second temperature T 2 , and wherein the supply of the washing liquid to the upper spray arm is stopped when the washing liquid temperature exceeds the first temperature T 1 .
  • the delicate washing load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid.
  • At least one upper spray arm and at least one lower spray arm each of that being substantially related to one of the respective baskets are provided in the washing chamber.
  • Such an arrangement allows to treat washing load differently depending whether it is arranged in the upper basket or in the lower basket.
  • the washing liquid is heated up to at least a first temperature T 1 in a first phase which is a main washing phase and to a second temperature T 2 in a second phase which is a rinse phase wherein the main washing phase comprises the steps
  • the temperature of the washing load in the upper basket increases similarly as in the lower basket when the supply of the washing liquid to the upper spray arm is stopped.
  • the temperature of the washing liquid is reduced by substituting hot washing liquid with fresh liquid which allows to treat the delicate washing load more softly.
  • the temperatures of the washing liquid are adapted to the respective detergent.
  • the wash load in the upper basket is treated carefully with regards to the high temperature of the washing liquid and to the aggressive combination of detergent and hot washing liquid. Direct contact of washing liquid and delicate washing load is prevented in the case that the washing liquid comprises very high temperatures or temperatures effecting aggressive to the surfaces of the delicate washing load.
  • the temperature range of 45°C to 50°C is adapted to the activity of the enzyme component of the detergent.
  • the second temperature of 65°C or higher is adapted for cleaning heavy duty dishes which are arranged in the lower basket.
  • the dishwasher comprises a pump for circulating the washing liquid and wherein the pump speed is increased after the supply of the washing liquid to the upper spray arm was stopped and/or that the pressure with which the washing liquid is distributed by the spray arms is low when the washing liquid temperature is below the first temperature T 1 and that it is high in the main wash phase when the washing liquid temperature exceeds the first temperature T 1 and that it is low in the rinse phase even though the washing liquid temperature exceeds the first temperature T 1 .
  • the increase of the pump speed allows to treat the heavy duty dishes more powerful e.g. mechanically while the more delicate washing load is not treated aggressive. Further the pressure with which the washing liquid is distributed by the spray arms is adapted and/or adjusted to the washing liquid temperature. Therefore delicate washing load and in particular the surface of the delicate washing load is treated very softly.
  • a measuring system measures the liquid temperature within the sump and transfers the measured value to a control system of the dishwasher.
  • a dishwasher comprises a washing chamber wherein usually an upper basket and a lower basket for receiving the washing load are arranged and an upper spray arm and a lower spray arm are provided each one being related to one of the respective baskets, wherein washing liquid circulates within the dishwasher and wherein the washing liquid is distributed within the washing chamber by means of the spray arms and wherein the washing liquid is supplied to both spray arms by means of at least one pump and wherein liquid heating means are provided for heating the washing liquid.
  • the upper basket is provided for being loaded with more delicate washing load, e.g. glasses, wherein the lower basket is provided for more stable washing load, e.g. pots or plates.
  • Delicate means in particular the vulnerability of the surface of the dishes.
  • the circulation of the washing liquid usually comprises a sump in a bottom region of the dishwasher, wherein the washing liquid is collected coming from the washing chamber.
  • a pump is arranged in or adjacent to the sump for circulating the washing liquid within the dishwasher or, more precisely, within the circulation system of the dishwasher. Further means for discharging washing liquid from the circulation system and means for feeding the circulation system with fresh liquid are provided.
  • the temperature of the washing liquid might be measured within the sump or on alternative applicable positions, e.g. the spray arms or within the pump. Further the distribution of the washing liquid can be controlled in such a way, that both spray arms can be supplied with washing liquid at the same time, or only one of the spray arm.
  • the liquid heating means and the circulation system of the dishwasher as well as the means for discharging, the means for feeding and distributing the washing liquid can be controlled by a control system.
  • Commands to the control system can be given by a software implemented to a microcontroller connected to the control system or also from a hardware adapted to control the control system or by a user or a maintenance technician.
  • the control system can control the dishwasher in such way that it is able to perform a method according to Fig. 1 .
  • the diagram shows the characteristics "washing liquid temperature” and “washing liquid distribution” over a time line and how the two characteristics correlate with each other.
  • the diagram shows the temperature of the washing liquid as measured within the sump and the periods when both spray arms or only one of the spray arms is supplied with washing liquid.
  • the time line is subdivided in several washing phases.
  • Phase 1 is a pre-wash phase
  • phase 2 is a main wash phase
  • phase 3 is a cold rinse phase
  • phase 4 is a hot rinse phase
  • phase 5 is a drying phase.
  • phase 2 which is the main wash phase
  • the washing liquid is provided with a detergent, wherein the detergent comprises an enzyme component.
  • the washing liquid is heated up to a temperature that is adapted for the use of the detergent, in particular to a first temperature T 1 which enables the enzyme component to be active without being destroyed by a higher temperature.
  • a first temperature T 1 is between 45°C and 50°C, preferedly close to or exactly 50°C.
  • the washing liquid is kept on the first temperature T 1 without further heating up to allow sufficient duration of the enzyme component being active.
  • this treatment it is possible to supply washing liquid to both spray arms or only to the upper spray arm to ensure that the washing load in the upper basket is washed sufficiently during phase 2.
  • the washing liquid is heated up to a second temperature T 2 which can be 65°C or higher.
  • T 2 which can be 65°C or higher.
  • the washing liquid temperature reaches the second temperature T 2 , a part of the washing liquid is drained from the circulation system and substituted with fresh liquid. Thus, the washing liquid temperature is reduced. Phase 2 is continued and terminated with the washing liquid of reduced temperature, wherein the supply of the washing liquid to the upper spray arm remains stopped.
  • the pump speed can be reduced during heating up the washing liquid from the first temperature T 1 to the second temperature T 2 .
  • phase 3 and/or phase 4 which form together a rinse phase
  • the washing liquid temperature is heated up from a first temperature T 1 to a second temperature T 2 , in particular during phase 4 which is a hot rinse phase.
  • the supply of washing liquid to the upper spray arm is stopped when the washing liquid temperature exceeds the first temperature T 1.
  • rinse aid is added to the washing liquid and during phase 3 a part of the washing liquid is substituted with fresh liquid.
  • the washing liquid temperature during phase 3 does not exceed the first temperature T 1 and therefore the washing liquid is supplied to upper spray arm and the lower spray arm.
  • the washing liquid is drained and replaced with fresh liquid.
  • phase 4 the washing liquid is heated up, wherein the first temperature T 1 is exceeded and therefore the supply of washing liquid to the upper spray arm is stopped.
  • the washing liquid is heated up to the second temperature T 2 .
  • phase 5 which is a drying phase, is started.
  • Fig. 1 the diagram illustrates a division of the characteristics "washing liquid temperature” and "washing liquid distribution" in sections A to E.
  • section A washing liquid is supplied to the upper spray arm and the lower spray arm, the distribution of the washing liquid is to both at the same time or only one at a time changing after a certain time, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low.
  • section B the supply of washing liquid to the upper spray arm is stopped. Only the lower spray arm receives washing liquid. The washing liquid temperature is high and the washing liquid pressure is also high.
  • section C as in section A, the washing liquid is supplied to the upper spray arm and the lower spray arm, wherein the washing liquid temperature is low and the pressure with which the washing liquid is distributed by the spray arms is also low.
  • section D the supply of washing liquid to the upper spray arm is stopped, wherein the washing liquid temperature is high and the washing liquid pressure is low.
  • section E the circulation of the washing liquid is stopped completely.
  • a preferred ratio of pressures to be provided in the upper and the lower spray arm is shown in the following table. Section Sprayarm pressure Upper Lower A ⁇ 70 200 B 0 200 C ⁇ 70 ⁇ 140 D 0 110

Landscapes

  • Washing And Drying Of Tableware (AREA)
EP10175310A 2010-09-03 2010-09-03 Dishwasher and method for operating a dishwasher Withdrawn EP2425758A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10175310A EP2425758A1 (en) 2010-09-03 2010-09-03 Dishwasher and method for operating a dishwasher
PCT/EP2011/065180 WO2012028710A1 (en) 2010-09-03 2011-09-02 Dishwasher and method for operating a dishwasher
EP11752539.4A EP2611348B1 (en) 2010-09-03 2011-09-02 Dishwasher and method for operating a dishwasher
PL11752539.4T PL2611348T3 (pl) 2010-09-03 2011-09-02 Zmywarka do naczyń i sposób sterowania działaniem zmywarki do naczyń

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10175310A EP2425758A1 (en) 2010-09-03 2010-09-03 Dishwasher and method for operating a dishwasher

Publications (1)

Publication Number Publication Date
EP2425758A1 true EP2425758A1 (en) 2012-03-07

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ID=43619906

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10175310A Withdrawn EP2425758A1 (en) 2010-09-03 2010-09-03 Dishwasher and method for operating a dishwasher
EP11752539.4A Active EP2611348B1 (en) 2010-09-03 2011-09-02 Dishwasher and method for operating a dishwasher

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11752539.4A Active EP2611348B1 (en) 2010-09-03 2011-09-02 Dishwasher and method for operating a dishwasher

Country Status (3)

Country Link
EP (2) EP2425758A1 (pl)
PL (1) PL2611348T3 (pl)
WO (1) WO2012028710A1 (pl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104665740A (zh) * 2015-02-11 2015-06-03 佛山市顺德区美的洗涤电器制造有限公司 一种洗碗机及其洗涤加热控制方法和装置
WO2018210595A1 (de) 2017-05-19 2018-11-22 BSH Hausgeräte GmbH Geschirrspülmaschine und verfahren zum betreiben einer geschirrspülmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017102057B4 (de) 2016-02-29 2019-05-09 Miele & Cie. Kg Verfahren zum Betrieb eines Geschirrspülautomaten

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282840A1 (fr) * 1974-08-29 1976-03-26 Bosch Siemens Hausgeraete Procede de lavage de vaisselle, dans une machine a laver la vaisselle
DE2911005A1 (de) * 1979-03-21 1980-09-25 Licentia Gmbh Verfahren zum reinigen von geschirr in einer haushaltgeschirrspuelmaschine und haushaltgeschirrspuelmaschine zur durchfuehrung des verfahrens
EP1132038A2 (en) * 2000-02-24 2001-09-12 Merloni Elettrodomestici S.p.A. Dishwashing machine with differentiated washing capabilities
EP1362546A2 (de) * 2002-05-16 2003-11-19 Electrolux Home Products Corporation N.V. Verfahren zum Betreiben einer Geschirrspülmaschine und entsprechende Geschirrspülmaschine
DE10257826A1 (de) * 2002-05-16 2003-11-27 Electrolux Home Prod Corp Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine bei Verwendung von einem Kombinationspräparat mit mehreren Wirkstoffen
EP2156775A2 (en) * 2008-08-21 2010-02-24 LG Electronics Inc. Control method for a dishwasher
EP2156776A2 (en) * 2008-08-21 2010-02-24 Lg Electronics Inc. Dishwasher and controlling method of the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392419B1 (it) 2008-12-22 2012-03-02 Indesit Co Spa Metodo per evitare la rottura di stoviglie durante il lavaggio in una lavastoviglie.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282840A1 (fr) * 1974-08-29 1976-03-26 Bosch Siemens Hausgeraete Procede de lavage de vaisselle, dans une machine a laver la vaisselle
DE2911005A1 (de) * 1979-03-21 1980-09-25 Licentia Gmbh Verfahren zum reinigen von geschirr in einer haushaltgeschirrspuelmaschine und haushaltgeschirrspuelmaschine zur durchfuehrung des verfahrens
EP1132038A2 (en) * 2000-02-24 2001-09-12 Merloni Elettrodomestici S.p.A. Dishwashing machine with differentiated washing capabilities
EP1132038B1 (en) 2000-02-24 2009-12-30 Indesit Company s.p.a. Dishwashing machine with differentiated washing capabilities
EP1362546A2 (de) * 2002-05-16 2003-11-19 Electrolux Home Products Corporation N.V. Verfahren zum Betreiben einer Geschirrspülmaschine und entsprechende Geschirrspülmaschine
DE10257826A1 (de) * 2002-05-16 2003-11-27 Electrolux Home Prod Corp Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine bei Verwendung von einem Kombinationspräparat mit mehreren Wirkstoffen
EP2156775A2 (en) * 2008-08-21 2010-02-24 LG Electronics Inc. Control method for a dishwasher
EP2156776A2 (en) * 2008-08-21 2010-02-24 Lg Electronics Inc. Dishwasher and controlling method of the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104665740A (zh) * 2015-02-11 2015-06-03 佛山市顺德区美的洗涤电器制造有限公司 一种洗碗机及其洗涤加热控制方法和装置
CN104665740B (zh) * 2015-02-11 2017-06-06 佛山市顺德区美的洗涤电器制造有限公司 一种洗碗机及其洗涤加热控制方法和装置
WO2018210595A1 (de) 2017-05-19 2018-11-22 BSH Hausgeräte GmbH Geschirrspülmaschine und verfahren zum betreiben einer geschirrspülmaschine
DE102017208562A1 (de) 2017-05-19 2018-11-22 BSH Hausgeräte GmbH Geschirrspülmaschine und Verfahren zum Betreiben einer Geschirrspülmaschine
US11311168B2 (en) 2017-05-19 2022-04-26 BSH Hausgeräte GmbH Dishwasher and method for operating a dishwasher

Also Published As

Publication number Publication date
WO2012028710A1 (en) 2012-03-08
EP2611348B1 (en) 2023-11-08
EP2611348A1 (en) 2013-07-10
PL2611348T3 (pl) 2024-04-08

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