EP2201884B1 - Verfahren zum Verhindern des Zerbrechens von Geschirrartikeln während des Waschens in einem Geschirrspüler - Google Patents

Verfahren zum Verhindern des Zerbrechens von Geschirrartikeln während des Waschens in einem Geschirrspüler Download PDF

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Publication number
EP2201884B1
EP2201884B1 EP09015604A EP09015604A EP2201884B1 EP 2201884 B1 EP2201884 B1 EP 2201884B1 EP 09015604 A EP09015604 A EP 09015604A EP 09015604 A EP09015604 A EP 09015604A EP 2201884 B1 EP2201884 B1 EP 2201884B1
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EP
European Patent Office
Prior art keywords
washing
zone
washing liquid
new
compartment
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.)
Not-in-force
Application number
EP09015604A
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English (en)
French (fr)
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EP2201884A1 (de
Inventor
Maria Chiara Brugnera
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Whirlpool EMEA SpA
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Indesit Co SpA
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Priority to PL09015604T priority Critical patent/PL2201884T3/pl
Publication of EP2201884A1 publication Critical patent/EP2201884A1/de
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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
    • A47L15/4289—Spray-pressure measuring or regulating arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—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
    • 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
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms
    • 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
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/02—Pressurised cleaning liquid delivered by a pump

Definitions

  • This invention relates to a method for preventing kitchenware articles which are sensitive to thermal shocks from breaking as a result of sudden cooling during washing in a dishwasher.
  • kitchenware articles which might break as a result of sudden cooling may be bowls or glasses made of glass or china.
  • washing such kitchenware articles is an extremely delicate operation. See for instance document EP 1 132 038 A2 .
  • one of the most serious is that linked to breaking as a result of thermal shock after sudden cooling.
  • the articles to be washed which are placed in a washing compartment are subject to repeated heating and cooling.
  • the washing cycle usually comprises a main wash followed by a series of rinses.
  • the washing liquid is loaded on the bottom of the washing compartment.
  • Said washing liquid is drawn by a pump and a rotating sprayer sprays it against the kitchenware articles.
  • gravity causes the washing liquid to collect again on the bottom of the washing compartment again and it can again be drawn by the pump for spraying against the kitchenware articles.
  • the washing liquid pumped from the washing compartment may be heated by an electric heating element located along a duct connecting the bottom of the washing compartment and the sprayer.
  • the washing liquid normally consists mostly of water drawn from the water mains and, therefore, at the start of washing its temperature is usually below 20°C (said temperature depends on outside environmental conditions, for example during some seasons and in some regions of the planet it could be 4°C). After heating, after a predetermined period the washing liquid will have a temperature of around 45°C.
  • washing liquid usually consists mostly of water drawn from the water mains and therefore is at a temperature considerably lower than that of the kitchenware articles (for example, it could be at 19°C). If said liquid were to come into contact with kitchenware articles which might break as a result of sudden cooling, thermal shocks could occur which would be such that they could cause the kitchenware articles to break.
  • the technical purpose which forms the basis of this invention is to propose a method for washing kitchenware articles which might break as a result of sudden cooling that overcomes the above-mentioned disadvantages of the prior art.
  • this invention has for an aim to propose a method for washing kitchenware articles which might break as a result of sudden cooling which avoids the risk of damaging such kitchenware articles.
  • This invention relates to a method for preventing kitchenware articles which are sensitive to thermal shocks from breaking as a result of sudden cooling during washing in a dishwasher 1.
  • the method is implemented when the user selects a specific programme for washing kitchenware articles which might break as a result of sudden cooling (the programme is often called "crystal cycle” or “delicate cycle”).
  • the method comprises the steps of performing a first washing step by spraying a heated washing liquid against a first zone 21 that accommodates the articles which might break as a result of sudden cooling.
  • the first zone 21, relative to the physical vertical, is located above a second zone 22 for accommodating kitchenware articles.
  • the first and second zones 21, 22 are inside a dishwasher 1 washing compartment 2 during the first washing step.
  • the first washing step usually comprises also spraying the second zone 22 of the washing compartment 2.
  • spraying of the second zone 22 may take place simultaneously with the spraying of the first zone 21 of the washing compartment 2 (if nothing else because the second zone 22 is under the first washing zone 21 and gravity causes the washing liquid to fall, also wetting the second zone 22).
  • the first washing step comprises spraying the washing liquid against the second zone 22 of the washing compartment 2.
  • the first and second zones 21, 22 may be sprayed directly with the washing liquid simultaneously or alternatively first one and then the other.
  • the user Before the first washing step; the user must have placed the kitchenware articles which might break as a result of sudden cooling in the first zone 21 and any other, less delicate kitchenware articles (pans, cutlery, etc.) in the second zone 22.
  • the presence or absence of kitchenware articles in the second zone 22 does not affect implementation of the method.
  • the kitchenware articles which might break as a result of sudden cooling could be placed either in the first or second washing zone 21, 22. Heating of the washing liquid used in the first washing step may take place at least partly simultaneously with the first washing step, or it may take place before the start of the first washing step.
  • a washing cycle may normally comprise:
  • the first washing step comprises the main wash.
  • the washing liquid used in the first washing step comprises water to which at least one detergent may be added.
  • Heating of the washing liquid used during the first washing step is linked to the fact that the water is drawn from the water mains and therefore is at ambient temperature (not high enough for an efficient degreasing action).
  • the kitchenware articles placed in the first zone 21 are substantially at ambient temperature. Consequently, contact with the washing liquid at ambient temperature does not create risks of breakage.
  • the washing liquid used during the first washing step usually collects, due to gravity, on the bottom of the washing compartment 2 and can be drawn again and sprayed again on the kitchenware articles to be washed.
  • the first washing step has a predetermined duration (in the example in Figure 2 the duration is 22.5 minutes).
  • the method involves draining from the washing compartment 2 the first washing liquid used during the first washing step (this step is indicated by the arrow labelled A1 in Figure 2 ).
  • the washing liquid used in the first washing step is suitably expelled from the dishwasher 1 through a drainage channel 47 along which a drainage pump 48 is located. This occurs at the end of the predetermined duration of the first washing step.
  • minimal amounts of the washing liquid used during the first washing step may remain on the kitchenware articles or on the walls of the washing compartment 2 (for example in the form of droplets).
  • the method also involves performing a second washing step using a new washing liquid.
  • Said new washing liquid at least initially, is cooler than the washing liquid sprayed just before the end of the first washing step. Therefore, the temperature of the new washing liquid sprayed against the kitchenware articles at the start of the second washing step is lower than the temperature of the washing liquid sprayed against the kitchenware articles just before the end of the first washing step.
  • the second washing step is usually a first rinse (labelled B in Figure 2 ) which (advantageously, but not necessarily) could be followed by other rinses (for example, rinse C in Figure 2 ).
  • the washing liquid used in the first washing step and the new washing liquid used in the second washing step could be of the same type.
  • the washing liquid used in the first washing step and the new washing liquid could comprise water to which detergents may have been added.
  • the particles of the new washing liquid are substantially no longer the same particles of liquid used for the first washing step.
  • the second washing step comprises a sub-step of feeding the new washing liquid into the washing compartment 2. During said feeding step, gravity causes the new washing liquid to occupy the bottom of the washing compartment 2.
  • the second washing step also comprises a first operating sub-step (labelled B1 in Figure 2 ).
  • Said first operating sub-step involves spraying the new washing liquid into the washing compartment 2 without allowing the new washing liquid to come into contact with the first washing zone 21.
  • the new washing liquid is drawn from the washing compartment 2 and, relative to the direction of the physical vertical, at last partly sprayed upwards from the bottom of the second washing zone 22.
  • the new washing liquid is also sprayed with insufficient force for it to reach a first predetermined height 211 where the first washing zone 21 of the washing compartment 2 is located.
  • the kitchenware articles which might break as a result of sudden cooling placed in the first zone 21 are still warm following the first washing step and if the new liquid (which at least at the start of the second washing step is noticeably cooler than the kitchenware articles) were to strike them, they could break.
  • the sub-step of feeding the new washing liquid involves pumping water at ambient temperature from an external source.
  • the water is drawn from the water mains. It may then have any detergents required added to it in order to form the new washing liquid.
  • the new washing liquid could be sprayed at a temperature close to 19°C (said value is provided by way of example only, since it depends on the temperature of the outside environment. In winter or in geographical areas with a cold climate, said temperature could be much lower).
  • the new washing liquid collects, due to gravity, on the bottom of the washing compartment 2, from where it can be drawn again for spraying.
  • the second washing step therefore comprises a sub-step of heating the new washing liquid.
  • the heating sub-step is at least partly simultaneous with the first operating sub-step.
  • heating means 9 are used for the heating.
  • the dishwasher 1 comprises a feed conduit 49 extending between the washing compartment 2 and the spraying means 4 which spray the washing liquid into the washing compartment 2.
  • the heating means 9 are located along the feed conduit 49.
  • the heating means 9 comprise a heating element 90.
  • the new washing liquid therefore acquires heat from the heating means 9.
  • the temperature of the new washing liquid is between 35°C and 50°C, preferably equal to around 45°C.
  • the duration of the heating sub-step is linked to a predetermined condition.
  • the predetermined condition may be the detection of a predetermined temperature by means of a sensor which comes into contact with the new washing liquid or which is located in the washing compartment 2.
  • the predetermined condition is a predetermined interval of time.
  • the duration of the heating step is equal to a preset interval of time.
  • the heating means 9 are switched off at the end of the preset interval of time.
  • the first operating sub-step is substantially simultaneous with the heating sub-step.
  • the new washing liquid is gradually heated up during the first operating sub-step. This is due to the fact that the new liquid repeatedly comes into contact with the heating element 90.
  • the particles of the new washing liquid after being sprayed by the spraying means 4, again collect on the bottom of the washing compartment 2, from where they are drawn and thanks to the conduit 49 again directed towards the spraying means 4. This forces the particles of the new washing liquid to pass the heating element 90 several times, thus gradually increasing the temperature of the new washing liquid.
  • the new washing liquid may be topped up one or more times.
  • the second washing step also comprises a second operating sub-step, following the first operating sub-step, in which the new washing liquid is sprayed into the washing compartment 2 and strikes the first zone 21 of the washing compartment 2. This allows washing of the kitchenware articles placed in the first washing zone 21.
  • the new washing liquid also suitably strikes the second zone 22 of the washing compartment 2.
  • the second operating sub-step starts after the sub-step of heating the new washing liquid.
  • the new washing liquid is at a temperature high enough to prevent the kitchenware articles which are sensitive to sudden cooling from breaking.
  • the temperature detected in the washing compartment 2 is approximately constant and equal to that reached at the end of the heating sub-step (at most there will be slight cooling due to heat dissipation to the outside).
  • the new washing liquid reaches a first rack 5 in which the first zone 21 of the washing compartment 2 is obtained.
  • This allows washing of the kitchenware articles which might break as a result of sudden cooling that the user previously placed in the first zone 21 of the washing compartment 2.
  • the most delicate articles are placed in the upper rack, whilst the lower rack is used for sturdier pans and kitchenware articles (therefore the user is familiar with this separation).
  • the new washing liquid is sprayed upwards from under the second zone 22 of the washing compartment 2 with sufficient force for it to reach a second height 221 which is below the first height 211 and where the second washing zone 22 of the washing compartment 2 is located.
  • the new washing liquid in the first operating sub-step, comes into contact with a second rack 6 in which the second zone 22 of the washing compartment 2 is obtained.
  • the second rack 6 relative to the direction of the physical vertical, is positioned below the first rack 5.
  • the new washing liquid is still too cool for washing the warm kitchenware articles which might break as a result of sudden cooling located in the first rack 5. While waiting for the new washing liquid to heat up it is therefore used for washing the kitchenware articles that the user previously placed in the second rack 6.
  • the new washing liquid is sprayed upwards from under the second zone 22 of the washing compartment 2 with insufficient force for it to reach a second height 221 which is below the first height 211 and where the second washing zone 22 of the washing compartment 2 is located.
  • the first height 211 is further from a horizontal surface below the dishwasher 1 than the second height 221.
  • the first height 211 is at the lower edge of the first washing zone 21.
  • the second height 221 is at the lower edge of the second washing zone 22.
  • the first and second racks 5, 6 are inside the washing compartment 2. Both the first rack and/or the second rack 5, 6 can normally be removed from the washing compartment 2 to allow the kitchenware articles to be loaded and unloaded.
  • the method comprises adjusting the rotation speed of a feed pump 3 which pumps the new washing liquid from the washing compartment 2 to at least one nozzle 46 belonging to the spraying means 4 which sprays it into the washing compartment 2.
  • the nozzle 46 is part of the washing compartment 2 spraying means 4.
  • said rotation speed is less than during the second operating sub-step, so as not to impart (during the first operating sub-step) sufficient energy to the washing liquid sprayed upwards from under the second zone 22 to reach the first zone 21 of the washing compartment 2.
  • the pump 3 is of the centrifugal type.
  • the pump 3 rotation speed is such that it prevents the washing liquid sprayed upwards from under the second zone 22 having sufficient force to reach the second zone 22 of the washing compartment 2.
  • the centrifugal pump 3 rotation speed is between 1600 and 1800 rpm.
  • the centrifugal pump 3 rotation speed is between 2000 and 2500 rpm (not necessarily maintaining a constant value):
  • the rotation speed values indicated above are provided purely by way of example and depend on the pressures to be obtained.
  • the method may comprise regulating the load losses in the conduit 49, said load loss adjustment being determined by varying the geometry of the conduit 49 (for example, by adjusting the transit cross-section of a point of the conduit 49).
  • the load losses in the conduit 49 are higher than during the second operating sub-step.
  • the method therefore comprises acting on the pump 3 rotation speed or on the geometry of the conduit 49 which draws the new washing liquid from the bottom of the washing compartment 2 so that it can again be sprayed against the kitchenware articles placed in the washing compartment 2.
  • the new washing liquid is sprayed upwards only from under the second zone 22. This also makes it possible to reduce the possibility that the new washing liquid will come into contact with the first zone 21 of the washing compartment 2.
  • the new washing liquid is at least partly sprayed from the bottom upwards.
  • the new washing liquid is at least partly sprayed from an intermediate position between the first and second zones 21, 22 of the washing compartment 2. This allows the best possible washing even of the kitchenware articles placed in the first zone 21 of the washing compartment 2 and which might break as a result of sudden cooling.
  • the first and/or the second operating sub-step is/are performed in a predetermined interval of time.
  • the new washing liquid is disposed of outside the dishwasher 1.
  • a third washing step (labelled C in Figure 2 ).
  • the third washing step repeats the sub-steps already described in connection with the second washing step (using a new washing liquid compared with that used during the second washing step).
  • the third washing step may comprise a new step of heating the washing liquid being used (initially introduced at a temperature close to ambient temperature).
  • said new heating step is carried out for a predetermined interval of time.
  • the new heating step brings at least the first washing zone 21 to a temperature of between 60°C and 70°C (advantageously around 65°C).
  • the temperature of the washing compartment 2 during the third washing step is then maintained at a substantially constant temperature for a predetermined interval of time (see C2 in Figure 2 ). During C2 the liquid being used is no longer heated.
  • the third washing liquid is drained during the drying step.
  • FIG. 1 shows a non-limiting example of a dishwasher 1 which implements the method described above.
  • Said dishwasher 1 comprises the washing compartment 2 and first and second means 7, 8 for positioning kitchenware articles inside the washing compartment 2.
  • the first positioning means 7 are above the second positioning means 8 relative to the direction of the physical vertical.
  • the first positioning means 7 form the first washing zone 21, whilst the second positioning means 8 form the second washing zone 22.
  • first and second positioning means 7, 8 are integrated in a single rack (which can normally be removed from the washing compartment 2).
  • the first positioning means 7 could comprise a flap applied to the lateral walls of the rack, whilst the second positioning means 8 could comprise for example the bottom of the rack.
  • the dishwasher 1 comprises a first rack and a second rack 5, 6 which are located in the washing compartment 2.
  • the first rack 5 comprises the first positioning means 7 and is obtained above the second rack 6 which in turn comprises the second positioning means 8.
  • the first rack and the second rack 5, z6 can normally be removed from the washing compartment 2. During washing the first and second racks 5, 6 are inside the washing compartment 2.
  • the dishwasher 1 also comprises the means 4 for spraying the washing liquid into the washing compartment 2.
  • the spraying means 4 comprise at least a first sprayer 42. Relative to the physical vertical the first sprayer 42 is below the second positioning means 8 for the kitchenware articles.
  • the first sprayer 42 is located below the second rack 6.
  • the spraying means 4 may also comprise a second sprayer 41 interposed between the first and second racks 5, 6.
  • the first and second sprayers 42, 41 are rotating and comprise a plurality of nozzles 46 allowing the outflow of the liquid used to wash the kitchenware articles.
  • the feed conduit 49 comprises a first duct 54 extending from the washing compartment 2.
  • the first duct 54 has a branch 50 downstream of the pump 3. Extending from the branch 50 there is a second duct 51 which allows the first sprayer 42 to be fed and a third duct 52 which allows the second sprayer 41 to be fed.
  • the dishwasher 1 comprises shutoff means 53 which allow or inhibit the flow of a liquid along the second and/or third ducts 51, 52.
  • the shutoff means 53 comprise a first valve 55 located at the branch 50.
  • the valve 55 allows fluid communication of the first duct 54 with the second duct 51 or with the third duct 52 or with both or neither of the two.
  • the valve 55 has one inlet and two outlets.
  • the inlet is at one end of the first duct 54, the two outlets are respectively at one end of the second and one end of the third ducts 51, 52.
  • the dishwasher 1 also comprises means for adjusting at least one jet of the washing liquid coming out of the first sprayer 42.
  • the adjusting means allow the jet to adopt a first and a second operating condition.
  • Said adjusting means could be a variable speed pump or means for varying the geometry of the conduit 49 (in particular, they allow narrowing or widening of a transit cross-section of the conduit 49).
  • the jet In the first operating condition, even if undisturbed by the second positioning means 8 or by the kitchenware articles placed in them, the jet has insufficient force to reach the first positioning means 7.
  • said force In a first embodiment of the dishwasher, in the first operating condition said force is, however, sufficient to reach the second positioning means 8.
  • said force In a second embodiment of the dishwasher, in the first operating condition said force is, however, insufficient to reach the second positioning means 8. Therefore, in the first operating condition the first operating sub-step described above with reference to the second washing step is implemented.
  • the first sprayer 42 is obtained under the second rack 6.
  • the jet of the first sprayer 42 reaches the second rack 6, but not the first rack 5.
  • the second sprayer 41 is switched off.
  • the jet of the first sprayer 42 might have sufficient force to reach the first positioning means 7.
  • the second sprayer 41 sprays at least one jet of the new washing liquid towards the first rack 5.
  • This invention has important advantages. First, it allows the washing of kitchenware articles which might break as a result of sudden cooling in a dishwasher, minimising the risk of breakages.
  • Another important advantage is linked to optimisation of the washing time, since even when the washing liquid has a temperature such that its use is not recommended on warm kitchenware articles which might break as a result of sudden cooling, it is still used for washing less delicate kitchenware articles (for example, those made of steel).

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)

Claims (14)

  1. Verfahren zum Verhindern eines Zerbrechens von gegen Thermalschocks empfindlichen Küchenutensilien-Artikeln in Folge eines plötzlichen Abkühlens während einer Wäsche in einem Geschirrspüler (1), dadurch gekennzeichnet, dass das Verfahren folgende Schritte umfasst:
    i) Ausführen eines ersten Waschschritts durch Sprühen einer erwärmten Waschflüssigkeit auf einen ersten Bereich (21), der die Artikel aufnimmt, welche wegen eines plötzlichen Abkühlens brechen könnten, wobei sich der erste Bereich (21) relativ zur physikalischen Vertikalen über einem zweiten Bereich (22) zur Aufnahme von Küchenutensilien-Artikeln befindet, wobei sich der erste und der zweite Bereich (21, 22) in einem Waschabteil (2) des Geschirrspülers (1) befinden;
    ii) Ablassen der während des ersten Waschschritts verwendeten Waschflüssigkeit aus dem Waschabteil (2);
    iii) Ausführen eines zweiten Waschschritts unter Verwendung neuer Waschflüssigkeit, die anfänglich kühler als die gerade vor dem Ende des ersten Waschschritts versprühte Waschflüssigkeit ist, wobei der zweite Waschschritt umfasst:
    - einen Unterschritt, bei dem die neue Waschflüssigkeit in das Waschabteil (2) zugeführt wird;
    - einen ersten Betriebsunterschritt, bei dem die neue Waschflüssigkeit in das Waschabteil (2) gesprüht wird, ohne dass es der neuen Waschflüssigkeit dabei ermöglicht wird, mit dem ersten Waschbereich (21) in Kontakt zu gelangen; wobei während dieses ersten Betriebsunterschritts die neue Waschflüssigkeit relativ zu der Richtung der physikalischen Vertikalen von dem Waschabteil (2) gezogen und wenigstens teilweise von dem Boden des zweiten Waschbereichs (22) des Waschabteils (2) aufwärts gesprüht wird, wobei die neue Waschflüssigkeit mit einer Kraft gesprüht wird, die zum Erreichen einer ersten vorbestimmten Höhe (211), bei der sich der erste Waschbereich (21) des Waschabteils (2) befindet, durch die Waschflüssigkeit nicht ausreicht;
    - einen Unterschritt zum Erwärmen der neuen Waschflüssigkeit, wobei dieser Erwärmungsunterschritt wenigstens teilweise zeitgleich mit dem ersten Betriebsunterschritt stattfindet;
    - einen zweiten, dem ersten Betriebsunterschritt folgenden Betriebsunterschritt, bei dem die neue Waschflüssigkeit in das Waschabteil (2) gesprüht wird und auf den ersten Bereich (21) des Waschabteils (2) trifft.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des ersten Betriebsunterschritts die neue Waschflüssigkeit von unterhalb des zweiten Bereichs (22) des Waschabteils (2) aufwärts gesprüht wird, wobei die neue Waschflüssigkeit mit einer Kraft gesprüht wird, die zum Erreichen einer unterhalb der ersten vorbestimmten Höhe (211) befindlichen zweiten vorbestimmten Höhe (221), bei der sich der zweite Waschbereich (22) des Waschabteils (2) befindet, durch die Waschflüssigkeit nicht ausreicht.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des ersten Betriebsunterschritts die neue Waschflüssigkeit von unterhalb des zweiten Bereichs (22) des Waschabteils (2) aufwärts gesprüht wird, wobei die neue Waschflüssigkeit mit einer Kraft gesprüht wird, die zum Erreichen einer unterhalb der ersten vorbestimmten Höhe (211) befindlichen zweiten vorbestimmten Höhe (221), bei der sich der zweite Waschbereich (22) des Waschabteils (2) befindet, durch die Waschflüssigkeit ausreicht.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass
    - während des zweiten Betriebsunterschritts die neue Waschflüssigkeit ein erstes Gestell (5) erreicht, in dem der erste Bereich (21) des Waschabteils (2) erhalten ist;
    - bei dem ersten Betriebsunterschritt die neue Waschflüssigkeit, ohne das erste Gestell (5) zu erreichen, in Kontakt mit einem zweiten Gestell (6) gelangt, in dem der zweite Bereich (22) des Waschabteils (2) erhalten ist; wobei das zweite Gestell (6) relativ zu der Richtung der physikalischen Vertikalen unterhalb des ersten Gestells (5) positioniert ist; wobei wenigstens während des ersten und des zweiten Betriebsunterschritts das erste und das zweite Gestell (5, 6) in dem Waschabteil (2) sind.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste Betriebsunterschritt im Wesentlichen zeitgleich mit dem Erwärmungsunterschritt, der einen Teil des zweiten Waschschritts bildet, stattfindet.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es ein Anpassen der Rotationsgeschwindigkeit einer Zufuhrpumpe (3) umfasst, die die neue Waschflüssigkeit von dem Waschabteil (2) wenigstens zu einer Düse (46) pumpt, welche die Waschflüssigkeit in das Waschabteil (2) sprüht; wobei die Rotationsgeschwindigkeit während des ersten Betriebsunterschritts kleiner ist als während des zweiten Betriebsunterschritts, so dass nicht hinreichend viel Energie auf die von unterhalb des zweiten Bereichs (22) aufwärts gesprühte Waschflüssigkeit übertragen wird, um den ersten Bereich (21) des Waschabteils (2) zu erreichen.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es eine Regulierung der Lastverluste in einer Leitung (49), die von dem Waschabteil (2) zu den Sprühmittels (4) verläuft, umfasst, wobei die Lastverlustanpassung durch Variieren der Geometrie der Leitung (49) bestimmt wird; wobei die Lastverluste in der Leitung (49) während des ersten Betriebsunterschritts höher als während des zweiten Betriebsunterschritts sind.
  8. Verfahren nach Anspruch 7 unter direkter oder indirekter Rückbeziehung auf Anspruch 6, dadurch gekennzeichnet, dass die Sprühmittel (4) die Düse (46) umfassen.
  9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass während des ersten Betriebsunterschritts die neue Waschflüssigkeit nur von unterhalb des zweiten Bereichs (22) aufwärts gesprüht wird, während während des zweiten Betriebsunterschritts die neue Waschflüssigkeit wenigstens teilweise von dem Boden aufwärts und von einer Zwischenposition zwischen dem ersten und dem zweiten Bereich (21, 22) des Waschabteils (2) gesprüht wird.
  10. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste oder/und der zweite Betriebsunterschritt in einem vorbestimmten Zeitintervall ausgeführt wird/werden.
  11. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Unterschritt, bei dem die neue Waschflüssigkeit zugeführt wird, ein Pumpen von Wasser bei Umgebungstemperatur von einer externen Quelle umfasst.
  12. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die in dem ersten Waschschritt verwendete Waschflüssigkeit und die neue, in dem zweiten Waschschritt verwendete Waschflüssigkeit von derselben Art sind.
  13. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die in dem ersten Betriebsunterschritt verwendete Waschflüssigkeit wenigstens teilweise während des ersten Waschschritts erwärmt wird oder vor dem ersten Waschschritt erwärmt wird.
  14. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste Waschschritt auch ein Sprühen der Waschflüssigkeit auf den zweiten Bereich (22) des Waschabteils (2) umfasst.
EP09015604A 2008-12-22 2009-12-17 Verfahren zum Verhindern des Zerbrechens von Geschirrartikeln während des Waschens in einem Geschirrspüler Not-in-force EP2201884B1 (de)

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ITRN2008A000066A IT1392419B1 (it) 2008-12-22 2008-12-22 Metodo per evitare la rottura di stoviglie durante il lavaggio in una lavastoviglie.

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IT1398885B1 (it) * 2010-03-02 2013-03-21 Indesit Co Spa Metodo e macchina per il trattamento di stoviglie
EP2425758A1 (de) 2010-09-03 2012-03-07 Electrolux Home Products Corporation N.V. Geschirrspüler und Verfahren zur Bedienung einer Geschirrspülmaschine

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AT293675B (de) * 1968-08-07 1971-10-25 Zanussi A Spa Industrie Geschirrspülmaschine
IT1319915B1 (it) * 2000-02-24 2003-11-12 Merloni Elettrodomestici Spa Macchina lavastoviglie con possibilita' di lavaggio differenziato.

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EP2201884A1 (de) 2010-06-30
ES2358782T3 (es) 2011-05-13
DE602009000500D1 (de) 2011-02-10
ITRN20080066A1 (it) 2010-06-23
PL2201884T3 (pl) 2011-05-31
ATE493056T1 (de) 2011-01-15

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