EP0774230A2 - Waschgänge für Waschmaschine - Google Patents

Waschgänge für Waschmaschine Download PDF

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Publication number
EP0774230A2
EP0774230A2 EP96203119A EP96203119A EP0774230A2 EP 0774230 A2 EP0774230 A2 EP 0774230A2 EP 96203119 A EP96203119 A EP 96203119A EP 96203119 A EP96203119 A EP 96203119A EP 0774230 A2 EP0774230 A2 EP 0774230A2
Authority
EP
European Patent Office
Prior art keywords
washing
water
cleaning
substep
cycle
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
EP96203119A
Other languages
English (en)
French (fr)
Other versions
EP0774230A3 (de
EP0774230B1 (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
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 Candy SpA filed Critical Candy SpA
Publication of EP0774230A2 publication Critical patent/EP0774230A2/de
Publication of EP0774230A3 publication Critical patent/EP0774230A3/de
Application granted granted Critical
Publication of EP0774230B1 publication Critical patent/EP0774230B1/de
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
    • A47L15/4208—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
    • 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
    • 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
    • A47L2401/20—Time, e.g. elapsed operating time
    • 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
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet 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
    • A47L2501/02—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 washing cycle for a washing machine, in particular for a dishwashing machine.
  • washing cycles of current dishwashing machines comprise several steps executed in succession; more accurately, a washing cycle can comprise one or more steps of prewashing, followed by a plurality of steps of washing, followed in turn by a plurality of steps of rinsing.
  • Said filter has to have meshes that are increasingly smaller the more the washing water is subjected to recycling, in order to trap the greatest amount of dirt that is in suspension in the water itself, avoiding that such dirt, being less diluted, obstruct either the inlet or the outlet conduit of the washing pump. It is thus indispensable to clean the filter periodically.
  • a washing cycle for dishwashers comprising a step of automatic cleaning of the filter by means of a jet of water that is projected on said filter at the end of a step of discharge of the washing water. More accurately, at the end of said step of discharge of the washing water, while keeping the discharge pump of the dishwasher in operation, clean water is admitted that is projected in a jet, by means of a nozzle, toward the filter, so that the residues of dirt become detached from the walls of the filter and drop off, to be then discharged.
  • the abovementioned precise control devices thus allow a precise control of the quantity of water loaded by the dishwasher, but they are not, however, in a position to detect whether, during the execution of the washing cycle, the level of the water in the washing tank drops below a minimum pre-established level to avoid the washing pump from entering into cavitation.
  • This is a situation that tends to take place especially at every start of a new washing cycle, when the load to be washed is still dry and thus traps a considerable quantity of water, that is subtracted from that in the bottom of the washing tank. It has been found experimentally that a dry load traps about half a litre of water, a quantity that, given the accuracy with which the water is loaded into the washing tank, is sufficient to determine the cavitation of the washing pump.
  • the cavitation of the washing pump translates into a lower effectiveness of the flow of water urged by the distribution rotors toward the dishes to be washed, something that has a negative influence on the washing performances especially in washing cycles that do not provide for steps of prewashing.
  • a possible solution consists in restoring the ideal level of water in the washing tank by the action on the supply solenoid valve with a timed opening: in this case an additional quantity of water is loaded into the tank, which causes an increase in the total consumption of clean water.
  • the object of the present invention is that of providing a washing cycle for a washing machine, and in particular for dishwashers, that, even if implemented in a dishwasher equipped with a system of precise control of the quantity of water loaded into the washing tank, overcomes the abovementioned problems of cavitation of the washing pump, without naturally having to supply an increased amount of water.
  • a washing cycle for a washing machine comprising a step of cleaning the filtering means provided for filtering the washing water during said cycle, said step of cleaning being executed at the end of said washing cycle and comprising at least one substep during which both a discharge pump and valve means for supplying clean water are activated simultaneously, characterized in that said step of cleaning ends with said substep, and at the end of said substep of the step of cleaning both the discharge pump and said means for supplying clean water are disactivated, so that part of the clean water loaded up during said substep of the step of cleaning is not discharged and remains in the washing tank of the washing machine to be reused in a subsequent washing cycle.
  • a washing cycle for a washing machine that, as opposed to the known cycles, allows part of the clean water loaded during the step of cleaning the filter to be recovered; in a subsequent washing cycle, this quantity of recovered water is added to the volume of water loaded during the first steps of said subsequent cycle, thus compensating for the reduction of the level of water in the tank caused by the water trapped by the dry dishes; it is thus possible to avoid problems of cavitation of the washing pump without having to provide increased loads of water during the first steps of the washing cycle, but exploiting part of the water used for cleaning the filter.
  • the automatic washing of the filter in combination with the partial recovery of the water used for the automatic cleaning of the filter, allows a considerable saving of water with respect to for example the case wherein the filter is cleaned normally at the end of each washing cycle under a jet of water by means of brushing.
  • FIG. 1 With reference to Fig. 1, there are shown therein two traditional washing cycles of a dishwasher.
  • a first washing cycle is indicated with A, and comprises a step of prewashing PL, a step of washing L, a step of rinsing R and a step PF of automatic cleaning of a filter provided in a manner known in itself at the inlet of a washing pump that urges the water present in the washing tank of the dishwasher to a pair of distribution rotors.
  • the step of prewashing, the step of washing and the step of rinsing comprise in a manner known in itself several substeps, that will not be described in their details as they are known in themselves; for the purposes of the description of the present invention it will be sufficient to remember that the step of prewashing, the step of washing and the step of rinsing each comprise one or more steps of loading of clean water.
  • step RR of rinsing with decalcifying resins normally used in dishwashers for decalcifying the clean water loaded from the external water circuit.
  • the resins are first regenerated by causing water containing regenerating salts to flow through them; such water used for regenerating the resins is accumulated in a special tank with a capacity of about 300 cc during the steps wherein clean water is loaded.
  • the step of rinsing the resins RR comprises a first substep CS during which there are activated simultaneously both the discharge pump and the solenoid valve for supplying clean water, connected to a water circuit external to the dishwasher; a second substep S of complete discharge of the water contained in the washing tank; a third substep CS identical with the first substep CS; and a fourth substep S of complete discharge.
  • the step of cleaning the filter PF comprises, as described in the already mentioned Italian patent application No.22327 A/86, a first substep CS of simultaneous charge and discharge.
  • a first substep CS of simultaneous charge and discharge there are activated simultaneously both the discharge pump and the solenoid valve for supplying clean water, connected to a water circuit external to the dishwasher; considering the normal rating of the supply solenoid valve and of the water supply circuit of the dishwasher, the quantity of water loaded in the approximately fifteen seconds of duration of the substep CS is about one litre.
  • the step of cleaning the filter PF comprises a second substep of discharge S (substantially identical with the steps of discharge S that precede the steps of prewashing, washing, rinsing and cleaning of the filter) during which the discharge pump remains in operation, while the supply solenoid valve is disactivated; in this second substep S, the water atomized in the preceding substep CS drops to the bottom of the washing tank, and is completely discharged by the discharge pump.
  • Fig. 1 there is also shown a second washing cycle, indicated with B; such cycle is substantially identical with the cycle A described previously, except for the fact that it does not provide for a step of prewashing.
  • the cycle B starts at the discharge step S that precedes the step of washing L, and ends with the step of cleaning of the filter PF.
  • Fig. 2 there are shown diagrammatically the two washing cycles A and B, modified with respect to Fig. 1 according to the present invention.
  • the steps of prewashing PF, of washing L and of rinsing R of the washing cycle A are substantially identical with the corresponding steps of the cycle A of Fig. 1. Moreover, before the step of washing L and the step of cleaning the filter PF there are also steps of complete discharge S of the water, and between the step of washing L and the step of rinsing R there is also a step of rinsing RR of the decalcifying resins.
  • the step of cleaning the filter PF comprises also a first substep CS of simultaneous charge and discharge of water, according to the methods described previously. But as opposed to traditional washing cycles, the second substep of the step of cleaning the filter PF is not a step of discharge S, but a step of pause P (again, this step of pause is inserted to avoid changing the timers existing commercially, but it could be eliminated).
  • the step of cleaning the filter PF is executed and, in the substep CS with a duration of approximately fifteen seconds, the dishwasher loads up with a quantity of clean water equal to about one litre, water that is atomized and sprayed on the filter in order to detach the residues of dirt.
  • Part of the litre of clean water loaded up is simultaneously discharged by the discharge pump (substep S of the step PF) in order to eliminate the residues of dirt.
  • the supply solenoid valve is disactivated, and the atomized water is deposited on the bottom of the washing tank; the discharge pump is also disactivated, so that only part (about half) of the litre of clean water loaded up in the substep CS is actually discharged.
  • 0.5 l are constituted by the residue of water that remains in the tank at the end of the step of discharge S preceding the step of cleaning the filter PF, and 0.5 l are constituted by part of the clean water loaded up for cleaning the filter and not completely discharged.
  • the cycle according to the present invention allows the recovery of a quantity of (substantially clean) water equal to about 0.5 l, enough to avoid that, in the first steps of the washing cycle, when the load of dishes is still dry, phenomena of cavitation of the washing pump may be triggered, with the consequent limited efficiency of the washing action.
  • Fig. 2 it is also possible to see how the washing cycle B of Fig. 1 has been changed so as not to start during the step of discharge S preceding the step of washing L, but only after such step of discharge; in this way, even in the case that the washing cycle B is set up, in the washing tank of the dishwasher the half litre of water recovered during the step of cleaning the microfilter at the end of the previous washing cycle is always conserved.
  • the last substep of the step of rinsing RR of the decalcifying resins does not provide for the complete discharge of the water in the tank, but for a pause P (provided as already said in order to avoid changing the existing timers); in this way it is possible to recover part of the water used in rinsing the decalcifying resins (more accurately, the water contained in the tank containing the water for rinsing the resins, that is about 300 cc, is recovered), so that the quantity of water available for the first step of rinsing is increased; this contributes in avoiding cavitation of the washing pump even in the presence of critical conditions.
  • Fig. 3 is a cross-sectional view taken along a vertical plane of a bottom part of a washing tank of a dishwasher.
  • 1 a chassis of the dishwasher and with 2 a washing tank of the dishwasher; the washing tank 2 has a lower opening below which there is mounted a sump 3, in communication with the inside of the washing tank through a filtering plate 4.
  • a filter 5 with a substantially cylindrical shape, inside which there extends an atomizing-spraying nozzle 6 connected to a conduit 7 in turn connected to a supply solenoid valve 8; during the step PF of cleaning the filter 5, clean water is supplied to the nozzle 6 through the conduit 7, water that is atomized and sprayed on the walls of the filter 5 to cause the detachment of the residues of dirt.
  • a cup 9 for recovering the solid residues with the largest dimensions.
  • Fig. 3 there is diagrammatically indicated with 10 a device for the precise control of the quantity of water loaded into the washing tank 2 during the operation of loading up with clean water.
  • Such device 10 can for example be of the volumetric type, described for example in the already mentioned Italian patent application MI94A002144, but it could also be of a different type.
  • the device 10 executes the measurement of the volume of clean water loaded up through the supply solenoid valve 8, and sends the quantity of clean measured water, through a conduit 11 and a check valve 12, to the sump 5.
  • a discharge pump 13 with mouth on the bottom of the sump 5 (Fig. 4) that is activated for discharging the water present in the washing tank 2.
  • a first level is the level of the water in the sump 3 at the end of a step of complete discharge S, with the discharge pump still activated.
  • a second level is the level of the water in the sump 3 at the end of a step of complete discharge S, after the discharge pump has been disactivated; the level L2 corresponds to a volume of water substantially equal to 0.5 l, determined by the return into the sump of the water present in the intake conduits of the discharge pump and that cannot be discharged completely due to the appearance of phenomena of cavitation.
  • a third level L3 is the level of the water in the sump 3 during the execution of the substep CS of the step PF of cleaning the filter 5, during which both the discharge pump and the supply solenoid valve are activated.
  • a fourth level L4 is the level of the water that, according to the present invention, remains in the sump 3 at the end of the substep CS of the step PF of cleaning the filter 5 when such substep CS is not followed by a substep of complete discharge S; as described previously, the level L4 corresponding to a volume of water substantially equal to 1 l(0.5 l consisting of the residue of water that remains in the tank at the end of the step of discharge preceding the step of cleaning the filter, plus 0.5 l consisting of the part of clean water loaded up for cleaning the filter and not completely discharged), a volume that is conserved in the sump and that is recovered in a subsequent washing cycle.
  • the recovery of the 0.5 l in the step of cleaning the filter allows the avoidance of problems of cavitation of the washing pump in a subsequent
  • washing cycle according to the present invention finds use advantageously in dishwashers equipped with devices for the precise control of the quantity of clean water loaded up into the washing tank, nothing forbids it from being implemented in dishwashers equipped with traditional devices for the direct in-tank control by means of pressure-control chambers connected to the washing tank.
EP96203119A 1995-11-14 1996-11-07 Waschgänge für Waschmaschine Expired - Lifetime EP0774230B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95MI002329A IT1276119B1 (it) 1995-11-14 1995-11-14 Ciclo di lavaggio per macchina lavatrice
ITMI952329 1995-11-14

Publications (3)

Publication Number Publication Date
EP0774230A2 true EP0774230A2 (de) 1997-05-21
EP0774230A3 EP0774230A3 (de) 1998-07-01
EP0774230B1 EP0774230B1 (de) 2001-09-05

Family

ID=11372511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96203119A Expired - Lifetime EP0774230B1 (de) 1995-11-14 1996-11-07 Waschgänge für Waschmaschine

Country Status (3)

Country Link
EP (1) EP0774230B1 (de)
DE (1) DE69614968T2 (de)
IT (1) IT1276119B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976359A1 (de) * 1998-07-28 2000-02-02 CANDY S.p.A. Vorrichtung zum Filtern von Waschflüssigkeit in einem Geschirrspüler
EP0990413B1 (de) * 1998-09-29 2003-12-17 CANDY S.p.A. Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine
WO2011080090A1 (en) * 2009-12-31 2011-07-07 Arcelik Anonim Sirketi A dishwasher comprising a microfilter
EP2901908A1 (de) * 2014-01-31 2015-08-05 BSH Hausgeräte GmbH Reinigungseinrichtung, Filteranordnung, Spülbehälter und wasserführendes Haushaltsgerät
EP2554102A4 (de) * 2010-03-31 2016-07-20 Lg Electronics Inc Geschirrspüler und steuerungsverfahren dafür
WO2016155803A1 (en) * 2015-03-31 2016-10-06 Arcelik Anonim Sirketi Dishwasher with filter self-cleaning mode

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2213217A1 (de) 2009-01-29 2010-08-04 Electrolux Home Products Corporation N.V. Geschirrspüler und Verfahren zum Reinigen eines Filters, der zwischen einem Zuber und einem Sammelbehälter eines Geschirrspülers vorgesehen ist
EP2611349B1 (de) * 2010-09-02 2015-10-14 LG Electronics Inc. Geschirrspüler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2615846A1 (de) * 1976-04-10 1977-10-20 Miele & Cie Wasch- oder spuelverfahren fuer wasch- oder geschirrspuelmaschinen
IT1197983B (it) * 1986-11-13 1988-12-21 Candy Elettrodomestici Ciclo di lavaggio per macchine lavatrici, in particolare lavastoviglie e macchina lavatrice operante secondo tale ciclo
IT1248417B (it) * 1990-05-04 1995-01-16 Indesit S R L Stabilimento 3 Macchina lavastoviglie perfezionata.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976359A1 (de) * 1998-07-28 2000-02-02 CANDY S.p.A. Vorrichtung zum Filtern von Waschflüssigkeit in einem Geschirrspüler
EP0990413B1 (de) * 1998-09-29 2003-12-17 CANDY S.p.A. Verfahren und vorrichtung zum Filtrieren von Wasch- und/oder Spülflüssigkeit in einer Geschirrspülmaschine
WO2011080090A1 (en) * 2009-12-31 2011-07-07 Arcelik Anonim Sirketi A dishwasher comprising a microfilter
US20130037065A1 (en) * 2009-12-31 2013-02-14 Ismail Kokbiyik Dishwasher comprising a microfilter
EP2554102A4 (de) * 2010-03-31 2016-07-20 Lg Electronics Inc Geschirrspüler und steuerungsverfahren dafür
US9642510B2 (en) 2010-03-31 2017-05-09 Lg Electronics Inc. Dishwasher and control method thereof
EP2901908A1 (de) * 2014-01-31 2015-08-05 BSH Hausgeräte GmbH Reinigungseinrichtung, Filteranordnung, Spülbehälter und wasserführendes Haushaltsgerät
WO2016155803A1 (en) * 2015-03-31 2016-10-06 Arcelik Anonim Sirketi Dishwasher with filter self-cleaning mode

Also Published As

Publication number Publication date
DE69614968D1 (de) 2001-10-11
EP0774230A3 (de) 1998-07-01
IT1276119B1 (it) 1997-10-24
ITMI952329A0 (de) 1995-11-14
EP0774230B1 (de) 2001-09-05
DE69614968T2 (de) 2002-04-04
ITMI952329A1 (it) 1997-05-14

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