EP0998872A1 - Programme de fonctionnement pour la commande des machines à laver la vaisselle - Google Patents

Programme de fonctionnement pour la commande des machines à laver la vaisselle Download PDF

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Publication number
EP0998872A1
EP0998872A1 EP99117510A EP99117510A EP0998872A1 EP 0998872 A1 EP0998872 A1 EP 0998872A1 EP 99117510 A EP99117510 A EP 99117510A EP 99117510 A EP99117510 A EP 99117510A EP 0998872 A1 EP0998872 A1 EP 0998872A1
Authority
EP
European Patent Office
Prior art keywords
water
pump
level
washing vessel
recirculation
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
EP99117510A
Other languages
German (de)
English (en)
Other versions
EP0998872B1 (fr
Inventor
Ugo Favret
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
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi 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 Electrolux Zanussi Elettrodomestici SpA, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0998872A1 publication Critical patent/EP0998872A1/fr
Application granted granted Critical
Publication of EP0998872B1 publication Critical patent/EP0998872B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47L15/4206—Tubular 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
    • A47L15/0018—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
    • 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
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • 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
    • A47L2501/02—Water discharge, e.g. opening or closure of discharge valve
    • 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

Definitions

  • the present invention relates to a working programme for a dishwashing machine, said programme being so improved as to effectively enhance the overall performance of the machine.
  • Dishwashing machines are known to usually comprise a recirculation filter arranged in the path of a flow of water that is taken in by a recirculating pump to therewith supply means for spraying the washload items arranged in the washing vessel of the machine.
  • such a filter preferably includes a substantially frusto-conical portion with an aperture connecting the interior of the washing vessel with the intake of a draining pump.
  • a substantially cylindrical or frusto-conical filtering member that usually extends downwards from said aperture with a particularly fine-meshed structure.
  • the level of the water on the bottom of the washing vessel is generally known to lower from a "static" value to a “dynamic” value, whereas it rises again to its above mentioned static value when the recirculating pump is de-energized, ie. does not operate, such as this occurs for instance during the pauses that may be provided during the washing phase.
  • a traditional washing programme of a dishwashing machine mainly includes a series of selectively excludable operating phases, ie. at least a pre-wash phase, at least a main wash phase, at least a rinse phase with cold water, and at least a final rinse phase with hot water (possibly added with rinsing aid) that facilitates the final drying of the washload items.
  • Each one of these phases is carried out with water being first let into the washing vessel and the recirculation pump being energized, and ends with the recirculation pump being de-energized and the working liquor being let, ie. drained off the washing vessel.
  • the working liquor on the bottom of the washing vessel usually decreases slowly fron the static level down to a minimum residual level, so that the suspended soil particles tend to deposit and settle on the recirculation filter, where they remain, and tend to dry up in the meantime, until the dishwashing machine is operated again.
  • a subsequent operation of the dishwashing machine will of course carry with it the problem of an undesired clogging of the recirculation filter that affects the overall performance of the machine itself. This problem is particularly felt in the preferred case in which the recirculation pump and the drain pump of the dishwashing machine are driven by a same and single motor, as described for instance in EP-B-0 268 835.
  • dishwashing machine comprises a single motor for driving both the recirculation pump and the drain pump and/or the recirculation pump is substantially operated at intervals.
  • the dishwashing machine is of a traditional automatic type and comprises mainly a washing vessel 4 (shown only partially) provided on its lower side with a sump 8 collecting the working liquor (hereinafter named "water” for reasons of greater simplicity), the intake section 9 of a recirculation pump 10 being in communication with the bottom of said sump.
  • This recirculation pump is adapted to supply with water at least a rotating spray arm 11, or the like, for spraying the washload items.
  • the washing vessel 4 is provided with a drain circuit formed by a drain pump 5 with an intake pipe 6 and a delivery pipe 7.
  • the intake pipe 6 may be connected to the bottom of the sump 8 via a siphon-like arrangement 14 adapted to enable the same sump to become completely empty in the water draining phases.
  • the vessel 4 Underneath the spray arm 11, the vessel 4 also accomodates a recirculation filter 12 arranged in the path of a flow of water that is taken in by the pump 10 in order to be sprayed onto the washload items through the rotating spray arm 11, and that falls back again by gravity into the sump 8 where it collects.
  • a recirculation filter 12 arranged in the path of a flow of water that is taken in by the pump 10 in order to be sprayed onto the washload items through the rotating spray arm 11, and that falls back again by gravity into the sump 8 where it collects.
  • the filter 12 comprises a substantially plane portion 13 (having preferably a slightly frusto-conical shape) that joins with a substantially cylindrical (or frusto-conical) portion 15 extending downwards all the way to a wall 20. The latter joins in turn with the intake pipe 6 of the dram pump 5.
  • the portion 15 of the recirculation filter has a particularly fine mesh (the so-called "microfilter”) and both portions 13 and 15 are substantially concentric to the axis of rotation of the rotating spray arm 11.
  • the washing vessel 4 is adapted to be supplied with water through a water circuit of a per sè known type (not shown).
  • the recirculation pump 10 and the drain pump 5 are preferably driven by a single reversible electric motor 17 and are made and arranged as described in the afore cited EP-B-0 268 835.
  • the rotating spray arm 11 is preferably provided with auxiliary spray nozzles 18 and 19 which, when the recirculation pump 10 is operating, are adapted to direct towards the portions 13 and 15 of the recirculation filter 12 respective tangential water jets that are effective in automatically cleaning said portions, such as this is for instance described in GB-B-2 204 482.
  • the working programme comprises at least a phase in which water is let into the vessel 4, the recirculation pump 10 is operated temporarily, and the pump 5 is eventually operated to let said water off the washing vessel.
  • the programme may mainly comprise, in a sequence, the following selectively excludable operation phases: at least a pre-wash phase, at least a main wash phase, at least a rinse phase with cold water, and at least a final rinse phase with hot water (possibly added with rinsing aid) that facilitates the final drying of the washload items.
  • the dishwashing machine also comprises (per sè known and not shown) means adapted to heat up the water, while all main operational members and component parts of the dishwashing machine are controlled by a programme sequence control device (not shown, either, for reasons of greater simplicity).
  • the pump 10 is then energized so as to enable it to supply the rotating spray arm 11 at a pre-determined water flow rate P0 ( Figure 3).
  • the rotating spray arm 11 produces water jets 16 that are capable of showering the washload items, thereby exerting an effective mechanical soil-removing action over them.
  • the level of the water in the sump 8 decreases to a dynamic level D and the water circulating inside the vessel 4 is filtered by the filter 12, from which the retained soil particles are then sent to the drain 6 by the action of the afore cited auxiliary nozzles 18 and 19.
  • the water is preferably added with rinsing aid and heated until it reaches a pre-determined final temperature, eg. 65°C.
  • t3 - t4 which preferably takes place in advance of the rinsing aid addition to the water and when the same water has reached a temperature of say, 50°C, the water in the vessel 4 is in part let off by means of the pump 5, so that a reduced amount of water Q remains actually in the same vessel.
  • the recirculation pump 10 is temporarily de-energized.
  • the above cited reduced water amount Q (which ican anyway be easily determined by those skilled in the art) is such that, in a condition in which the recirculation pump 10 is de-energized, the water in the sump 8 is able to rise to a static level S1 which is substantially lower than not only the afore mentioned static level S, but also the level up to which the filter 12, and in particular the substantially plane portion 13 thereof, extends.
  • Such conditions of de-energization of the pump 10 may also occur throughout the periods t1 - t2 and t4 - t5 in the preferred case in which the pump itself operates with a sequence of energizations alternating with pauses, for instance to supply the rotating spray arm 11 in a pulsed manner or to alternately supply several rotating spray arms, as described in EP-B-0 237 994.
  • a cyclic operation of the pump 10 is not represented in Figures 2 and 3.
  • the recirculation pump 10 when (during the period t4 - t6 subsequent to the partial water let-off) the afore cited reduced water amount Q is present in the vessel 4, the recirculation pump 10 is operated at a reduced flow rate P1.
  • This may be obtained in a number of ways, but preferably by correspondingly decreasing the rotation speed of the pump 10, so as described for instance in IT-A-1 256 273, and is aimed at preventing the pump itself from undesirably unpriming and, therefore, generating hydraulic noise.
  • a further important advantage derives from the fact that the water in the sump 8 lies below the filter 13 at the instant t6, when the pump 5 is energized to carry out the final water drain, ie. completely let off the water at the end of the cycle. This means that soil particles floating in the water, whose level in the sump 8 slowly decreases until the same sump is eventually empties completely, are not able to deposit or settle on the filter portion 13 thereabove, which therefore remains advantageously clean.
  • the above described operation is particularly advantageous in the final rinse phase with hot water, as illustrated above, but it can be advantageously used in a substantially same manner in all other possible phases (ie. pre-wash, main wash, cold-water rinse) included in the working programme according to the present invention, with the sole difference that in some of these phases the water may be heated up to a different temperature or it may even not be heated at all.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
EP19990117510 1998-11-02 1999-09-04 Programme de fonctionnement pour la commande des machines à laver la vaisselle Expired - Lifetime EP0998872B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN980079 IT1305528B1 (it) 1998-11-02 1998-11-02 Programma operativo per lavastoviglie
ITPN980079 1998-11-02

Publications (2)

Publication Number Publication Date
EP0998872A1 true EP0998872A1 (fr) 2000-05-10
EP0998872B1 EP0998872B1 (fr) 2003-01-29

Family

ID=11395437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990117510 Expired - Lifetime EP0998872B1 (fr) 1998-11-02 1999-09-04 Programme de fonctionnement pour la commande des machines à laver la vaisselle

Country Status (4)

Country Link
EP (1) EP0998872B1 (fr)
DE (1) DE69905122T2 (fr)
ES (1) ES2192362T3 (fr)
IT (1) IT1305528B1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219228A1 (fr) * 2000-12-29 2002-07-03 BSH Bosch und Siemens Hausgeräte GmbH Procédé de contrôle d'un moteur électrique d'une pompe selon différentes vitesses de rotation
WO2005060812A1 (fr) * 2003-12-22 2005-07-07 BSH Bosch und Siemens Hausgeräte GmbH Commande d'un lave-vaisselle permettant de traiter de grandes quantites residuelles de restes d'aliments par des programmes de lavage variables
WO2005063108A1 (fr) * 2003-12-23 2005-07-14 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle presentant des pompes fonctionnant en alternance
EP1649797A1 (fr) * 2004-10-20 2006-04-26 Electrolux Home Products Corporation N.V. Lave-vaiselle et procédé de fonctionnement correspondant
WO2010079021A3 (fr) * 2008-12-19 2010-10-14 BSH Bosch und Siemens Hausgeräte GmbH Procédé de vidange d'un liquide d'un appareil électroménager à circulation d'eau
CN1897860B (zh) * 2003-12-23 2011-06-22 Bsh博施及西门子家用器具有限公司 采用可选择泵运行的餐具洗涤机
CN103079448A (zh) * 2010-09-02 2013-05-01 Lg电子株式会社 餐具清洗机及其控制方法
FR2993165A1 (fr) * 2012-07-12 2014-01-17 Fagorbrandt Sas Procede de commande en fonctionnement d'une machine a laver et machine a laver associee

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2436216T3 (es) * 2004-03-16 2013-12-27 Arçelik Anonim Sirketi Un lavavajillas y procedimiento de control del mismo

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374822A7 (fr) * 1976-12-20 1978-07-13 Licentia Gmbh Lave-vaisselle et son procede de fonctionnement
EP0317990A1 (fr) * 1987-11-26 1989-05-31 Abb Cylinda Ab Procédé de nettoyage automatique du dispositif d'évacuation de l'eau dans une machine à laver des articles, notamment lave-vaisselle, et appareil permettant de réaliser un tel procédé

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374822A7 (fr) * 1976-12-20 1978-07-13 Licentia Gmbh Lave-vaisselle et son procede de fonctionnement
EP0317990A1 (fr) * 1987-11-26 1989-05-31 Abb Cylinda Ab Procédé de nettoyage automatique du dispositif d'évacuation de l'eau dans une machine à laver des articles, notamment lave-vaisselle, et appareil permettant de réaliser un tel procédé

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219228A1 (fr) * 2000-12-29 2002-07-03 BSH Bosch und Siemens Hausgeräte GmbH Procédé de contrôle d'un moteur électrique d'une pompe selon différentes vitesses de rotation
WO2005060812A1 (fr) * 2003-12-22 2005-07-07 BSH Bosch und Siemens Hausgeräte GmbH Commande d'un lave-vaisselle permettant de traiter de grandes quantites residuelles de restes d'aliments par des programmes de lavage variables
US8491724B2 (en) 2003-12-22 2013-07-23 Bsh Bosch Und Siemens Hausgeraete Gmbh Dishwasher control for dealing with large amounts of food residues by variable wash programs
CN1897860B (zh) * 2003-12-23 2011-06-22 Bsh博施及西门子家用器具有限公司 采用可选择泵运行的餐具洗涤机
WO2005063108A1 (fr) * 2003-12-23 2005-07-14 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle presentant des pompes fonctionnant en alternance
US8197608B2 (en) 2003-12-23 2012-06-12 Bsh Bosch Und Siemens Hausgeraete Gmbh Dishwasher featuring alternating pump operation
US20090211600A1 (en) * 2004-10-20 2009-08-27 Electrolux Home Products Corporation N.V. Dishwasher and corresponding method for operating it
EP1649797A1 (fr) * 2004-10-20 2006-04-26 Electrolux Home Products Corporation N.V. Lave-vaiselle et procédé de fonctionnement correspondant
WO2006045374A1 (fr) * 2004-10-20 2006-05-04 Electrolux Home Products Corporation N.V. Lave-vaisselle et procede pour sa mise en oeuvre
CN102256527A (zh) * 2008-12-19 2011-11-23 Bsh博世和西门子家用电器有限公司 用于将流体泵送出带水运行的家用装置的方法
US20110232702A1 (en) * 2008-12-19 2011-09-29 BSH Bosch und Siemens Hausgeräte GmbH Method for pumping a fluid out of an aquiferous household device
WO2010079021A3 (fr) * 2008-12-19 2010-10-14 BSH Bosch und Siemens Hausgeräte GmbH Procédé de vidange d'un liquide d'un appareil électroménager à circulation d'eau
CN102256527B (zh) * 2008-12-19 2014-03-26 Bsh博世和西门子家用电器有限公司 用于将流体泵送出带水运行的家用装置的方法
RU2515463C2 (ru) * 2008-12-19 2014-05-10 Бсх Бош Унд Сименс Хаусгерете Гмбх Способ откачивания жидкости из водопроводящего бытового прибора
US9609996B2 (en) 2008-12-19 2017-04-04 BSH Hausgeräte GmbH Method for pumping a fluid out of an aquiferous household device
CN103079448A (zh) * 2010-09-02 2013-05-01 Lg电子株式会社 餐具清洗机及其控制方法
EP2611351A2 (fr) * 2010-09-02 2013-07-10 LG Electronics Inc. Lave-vaisselle et son procédé de commande
EP2611351A4 (fr) * 2010-09-02 2014-06-04 Lg Electronics Inc Lave-vaisselle et son procédé de commande
US8882928B2 (en) 2010-09-02 2014-11-11 Lg Electronics Inc. Method for controlling dishwasher
FR2993165A1 (fr) * 2012-07-12 2014-01-17 Fagorbrandt Sas Procede de commande en fonctionnement d'une machine a laver et machine a laver associee
EP2684503A3 (fr) * 2012-07-12 2014-01-22 FagorBrandt SAS Procédé de commande en fonctionnement d'une machine à laver et machine à laver associée

Also Published As

Publication number Publication date
EP0998872B1 (fr) 2003-01-29
IT1305528B1 (it) 2001-05-09
DE69905122T2 (de) 2003-11-13
DE69905122D1 (de) 2003-03-06
ITPN980079A1 (it) 2000-05-02
ES2192362T3 (es) 2003-10-01

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