EP0255863A2 - Dishwashing machine - Google Patents

Dishwashing machine Download PDF

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Publication number
EP0255863A2
EP0255863A2 EP87109160A EP87109160A EP0255863A2 EP 0255863 A2 EP0255863 A2 EP 0255863A2 EP 87109160 A EP87109160 A EP 87109160A EP 87109160 A EP87109160 A EP 87109160A EP 0255863 A2 EP0255863 A2 EP 0255863A2
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EP
European Patent Office
Prior art keywords
degree
contamination
rinse
liquid
washing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87109160A
Other languages
German (de)
French (fr)
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EP0255863B1 (en
EP0255863A3 (en
Inventor
Rainer Dr. Dipl.-Phys. Stamminger
Heinz Käfferlein
Wolf-Dieter Krueger
Karlheinz Kohles
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of EP0255863A3 publication Critical patent/EP0255863A3/en
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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
    • A47L15/0018—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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • 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
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A47L15/23—Rotary spraying devices moved by means of the sprays
    • 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
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • 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
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
    • 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
    • A47L2401/10—Water cloudiness or dirtiness, e.g. turbidity, foaming or level of bacteria
    • 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
    • A47L2401/14—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
    • A47L2501/02—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
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • 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
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the degree of contamination of the washing liquid is determined in a program-controlled dishwasher in one of the washing steps, for example the pre-washing step, the cleaning step, the intermediate washing step or rinsing steps.
  • a pressure sensor is arranged in the flushing liquid path, which is supplied with flushing liquid by a circulating pump, by means of which, when the circulating pump is operating, the magnetic valve in the water supply is opened in at least one program step when the pressure drops below a predetermined minimum due to an increased degree of contamination of the flushing liquid.
  • the individual rinse cycles are initially operated with a minimum amount of rinsing liquid.
  • the invention has for its object to provide a method according to the preamble of claim 1, by which a further reduction of water and energy consumption is made possible with little contamination of the dishes to be washed.
  • the amount of water required for the proper functioning is let into the washing container of the dishwasher at the beginning of each washing cycle. If an actual degree of soiling that is below a predetermined degree of soiling assigned to the respective rinse occurs during the course of the rinse cycle to be processed, then the current rinse can either be interrupted and the rinse liquid pumped out prematurely or, in the case of very little soiling, can also be taken over into the immediately subsequent rinse.
  • the pre-rinse cycle and the subsequent cleaning cycle are particularly suitable for this. This either only shortens the program duration accordingly or saves the liquid required for one of the two rinse cycles. If partial emptying is provided within the cleaning process in which the washing liquid is heated up to remove particularly high levels of contamination, then this partial emptying and refilling to the original level can also be dispensed with if there is little contamination found in the cleaning process.
  • the number of subsequent rinse cycles can also be reduced, either rinsing with a liquid filling over the entire time of all intermediate rinsing cycles or skipping the intermediate rinsing cycle (s) to be hidden. This reduction in water changes also saves water.
  • the pressure lines (4, 5) branch off from a flow reversing device (6), for example a continuously rotating rotary valve, which is connected to the pressure port (7) of a circulation pump (8).
  • a flow reversing device (6) for example a continuously rotating rotary valve, which is connected to the pressure port (7) of a circulation pump (8).
  • an intake (9) leads into a drain pan (10) provided in the bottom (11) of the washware container (1) and through funnel-shaped fine sieve (12) towards the interior (13) of the washware container (1) is covered.
  • the fine sieve (12) is in the lower part in a cylindrical, vertically downward fine sieve cylinder (14) which opens into a drain shaft (15).
  • a drain connection (16) leads from the drain shaft (15) to an emptying pump, not shown.
  • a coarse sieve (17) is located within the fine sieve cylinder (14).
  • the washware container is filled with liquid via a water line (18) with the controllable valve (19) switched on, which is controlled by a program switching device (20) that also controls the circulation pump (8) and other electrical components.
  • At least one sensor (21) is arranged in the washing system which outputs a control signal dependent on the determined degree of contamination to the program switching device.
  • Different degrees of soiling can also be predetermined in different rinse cycles as a starting point for the determination of a lower or increased level of soiling.
  • the sensor (21) can be designed as a pressure sensor (21.1) which is connected to the pressure port of the circulation pump. However, pressure sensors (21.2 or 21.3) can also be connected to the pressure lines (4) or (5) to the spray arms (2) or (3). A pressure sensor (21.4) can also be assigned to the intake port (9) of the circulation pump (8). However, the sensor (21) can also be designed as an optical sensor and respond to the turbidity of the rinsing liquid. In addition, it is also possible to use the sensor (21) to record the weight of the washing liquid or the flow rate of the washing liquid. However, the speed of the spray arms (2 or 3) can also be scanned with a sensor (21.5).
  • the power-dependent speed of the circulation pump (8) or the current consumption of the drive motor for the circulation pump (8) can also be detected with a sensor (21.6).
  • a sensor (21.6).
  • a bypass path can be provided in the flushing liquid path, in particular in the pipe system, in which a filter screen is arranged, a pressure sensor measuring the pressure loss or dynamic pressure occurring on the filter screen. This filter screen must be rinsed free after each rinse cycle in order to avoid falsification of the measurement result from previous rinse cycles.
  • the rinsing liquid with a pollution degree of 0 is practically pumped around in the rinsing system. If, for example, the pressure sensor (21.1) is used to determine the degree of contamination, then the maximum achievable pressure in the flushing system is present. If this pressure falls below a predetermined value in the course of the respective rinse cycle to be processed, which can be different in the pre-rinse cycle than in the cleaning cycle, this means normal or increased contamination of the items to be rinsed. There is then no reason to change a normal basic washing program according to FIG. 2. Accordingly, after the inflow of water for the pre-rinse cycle, the complete pre-rinse cycle specified by the program switching device is carried out.
  • the remaining time of the pre-rinse cycle is faded out or run over in the program sequence from the time the pressure measurement is evaluated. If the degree of contamination is very low, the rinsing liquid from the pre-rinse cycle can be used immediately for the subsequent cleaning cycle. There is then no need to change the water from emptying and supplying. If the degree of soiling is higher but below the normal value, it is advisable to change the water. In any case, however, the duration of the program will be reduced by the hidden part of the pre-wash cycle.
  • the rotational speed of the spray arms driven by recoil also changes, so that their rotational speed can also be a measure of the degree of contamination.
  • the power requirement for the drive motor of the circulating pump changes with the density of the rinsing liquid, which is dependent on the degree of contamination, so that the degree of contamination can also be determined by appropriate sensors via its speed or current consumption.
  • the liquid level in the drain pan changes with different delivery volumes of the circulation pump, so that the level of contamination can be determined from this using a level sensor (21.7).

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  • Washing And Drying Of Tableware (AREA)

Abstract

In the method, in individual washing runs of a multiple-run overall washing operation, the degree of soiling of the washing liquid is determined and the washing liquid is influenced depending on said degree of soiling. In order to reduce the water and energy requirement and the duration of the programme, when a low degree of soiling has been determined at least one of the complete washing liquid exchanges or partial washing liquid exchanges following in the overall washing programme is excluded. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Nach einem bekannten Verfahren dieser Art (DE-OS 26 46 383) wird bei einer programmgesteuerten Geschirrspülmaschine in einem der Spülgänge, beispielsweise dem Vorspülgang, dem Reinigungsgang, dem oder den Zwischenspülgängen oder dem Klarspülgang der Verschmutzungsgrad der Spülflüssigkeit ermittelt. Hierzu ist in den von einer Umwälzpumpe mit Spülflüssigkeit beschickten Spülflüssigkeitsweg ein Drucksensor angeordnet, durch den bei arbeitender Umwälzpumpe in zumindest einem Programmschritt bei Unterschreiten eines vorgegebenen Mindestdruckes infolge eines erhöhten Verschmutzungsgrades der Spülflüssigkeit das Magnetventil im Wasserzulauf geöffnet wird. Die einzelnen Spülgänge werden hierbei zu Beginn mit einer Mindestmenge von Spulflüssigkeit betrieben. Wird im Laufe des Spülganges ein vorbestimmter Verschmutzungsgrad überschritten, dann erfolgt eine weiterer Zulauf von Flüssigkeit und somit eine Verdünnung der verschmutzten Spülflüssigkeit. Nachdem das Arbeitsniveau der Spülflüssigkeit bei umlaufender Umwälzpumpe in einer Geschirrspülmaschine für den normalen Spülbetrieb knapp unterhalb eines das zurücklaufende Wasser filternden Feinsiebes gehalten wird, um die auf das Sieb gespülten Speisereste durch nachfolgende Spülflüssigkeit in das zentrale Grobsieb zu spülen und nicht durch das Feinsieb saugen zu lassen, wird das Arbeitsniveau durch das nachlaufende Wasser in den Bereich des Feansiebes angehoben. Dann besteht aber die Gefahr, daß die von der Umwälzpumpe angesaugte Spülflüssigkeit und damit auch darin enthaltene Verschmutzungen durch das Feinsieb angesaugt werden.According to a known method of this type (DE-OS 26 46 383), the degree of contamination of the washing liquid is determined in a program-controlled dishwasher in one of the washing steps, for example the pre-washing step, the cleaning step, the intermediate washing step or rinsing steps. For this purpose, a pressure sensor is arranged in the flushing liquid path, which is supplied with flushing liquid by a circulating pump, by means of which, when the circulating pump is operating, the magnetic valve in the water supply is opened in at least one program step when the pressure drops below a predetermined minimum due to an increased degree of contamination of the flushing liquid. The individual rinse cycles are initially operated with a minimum amount of rinsing liquid. If a predetermined degree of soiling is exceeded in the course of the wash cycle, then a further inflow of liquid takes place and thus a dilution of the soiled wash liquid. After the working level of the washing liquid with the circulating pump in a dishwasher for normal washing operation is kept just below a fine sieve that filters the returning water, in order to flush the food residues washed onto the sieve into the central coarse sieve by subsequent washing liquid and not to let them suck through the fine sieve , the working level is raised by the water flowing into the area of the fine sieve. Then there is the danger that the rinsing liquid sucked in by the circulation pump and thus also the dirt contained therein will be sucked in through the fine sieve.

Neben einer Verstopfung der entsprechenden Sieböffnungen besteht dabei auch die Gefahr, daß die Verschmutzungen beim Durchsaugen zerkleinert werden und nicht mehr ausgefiltert werden können. Die Flüssigkeitsfüllmenge zu Beginn der einzelnen Spülgänge ist dabei zwangsläufig zur Vermeidung von Luftansaugungen durch die Umwälzpumpe so bemessen, daß bis zu einem normalen Verschmutzungsgrad der zu spülenden Teile eine zusätzliche Verdünnung nicht erforderlich ist. Die bei besonders hoher Verschmutzung zusätzlich zugeführte Wassermenge erhöht dabei den Wasserverbrauch und, wenn die Spülflüssigkeit aufgeheizt wird, auch den Energieverbrauch.In addition to a blockage of the corresponding sieve openings, there is also the risk that the dirt will be crushed during suction and can no longer be filtered out. The amount of liquid at the beginning of the individual rinsing cycles is inevitably such that the circulation pump avoids air intake so that additional dilution is not necessary up to a normal degree of contamination of the parts to be rinsed. The amount of water additionally supplied in the case of particularly high pollution increases the water consumption and, if the washing-up liquid is heated, also the energy consumption.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 anzugeben, durch das bei geringer Verschmutzung des zu spülenden Geschirrs eine weitere Reduzierung des Wasser- und Energieverbrauch ermöglicht wird.The invention has for its object to provide a method according to the preamble of claim 1, by which a further reduction of water and energy consumption is made possible with little contamination of the dishes to be washed.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des Anspruchs 1.This object is achieved according to the invention by the characterizing features of claim 1.

Bei einer Verfahrensweise gemäß der Erfindung wird in den Spülbehälter der Geschirrspülmaschine zu Beginn jedes der Spülgänge die für das ordnungsgemäße Funktionieren erforderlich Wassermenge eingelassen. Tritt dann während des Ablaufs des gerade abzuarbeitenden Spülganges ein unter einem vorbestimmten, dem jeweiligen Spülgang zugeordneten Verschmutzungsgrad liegender tatsächlicher Verschmutzungsgrad auf, dann kann der laufende Spülgang entweder abgebrochen und die Spülflüssigkeit vorzeitig abgepumpt oder bei sehr geringer Verschmutzung auch in den unmittelbar nachfolgenden Spülgang übernommen werden. Dazu eignet sich insbesondere der Vorspülgang und der nachfolgende Reinigungsgang. Hierdurch wird entweder nur die Programmdauer entsprechend verkürzt oder die für einen der beiden Spülgänge erforderliche Flüssigkeit eingespart werden. Ist innerhalb des Reinigungsganges, in dem die Spülflüssigkeit aufgeheizt wird, eine Teilentleerung zur Abführung besonders hoher Verschmutzungen vorgesehen, dann kann bei geringer, im Reinigungsgang festgestellter Verschmutzung auch diese Teilentleerung und das Wiederauffüllen auf das Ursprungsniveau entfallen.In a procedure according to the invention, the amount of water required for the proper functioning is let into the washing container of the dishwasher at the beginning of each washing cycle. If an actual degree of soiling that is below a predetermined degree of soiling assigned to the respective rinse occurs during the course of the rinse cycle to be processed, then the current rinse can either be interrupted and the rinse liquid pumped out prematurely or, in the case of very little soiling, can also be taken over into the immediately subsequent rinse. The pre-rinse cycle and the subsequent cleaning cycle are particularly suitable for this. This either only shortens the program duration accordingly or saves the liquid required for one of the two rinse cycles. If partial emptying is provided within the cleaning process in which the washing liquid is heated up to remove particularly high levels of contamination, then this partial emptying and refilling to the original level can also be dispensed with if there is little contamination found in the cleaning process.

Ist die Verschmutzung im Reinigungsgang gerin, dann kann auch die Zahl der nachfolgenden Klarspülgänge reduziert werden, wobei entweder mit einer Flüssigkeitsfüllung über die gesamte Zeit aller Zwischenspülgänge gespült wird, oder der oder die auszublendenden Zwischenspülgänge übersprungen werden. Diese Verminderung der Wasserwechsel führt ebenfalls zur Einsparung von Wasser.If the soiling in the cleaning cycle is low, the number of subsequent rinse cycles can also be reduced, either rinsing with a liquid filling over the entire time of all intermediate rinsing cycles or skipping the intermediate rinsing cycle (s) to be hidden. This reduction in water changes also saves water.

Für die vorteilhafte Ausübung des Verfahrens wird bei einer Geschirrspülmaschine im Spülsystem ein Sensor angeordnet, der auf Änderungen anspricht, die sich aus dem Verschmutzungsgrad der Spülflüssigkeit ergeben. Ermittelt der Sensor einen geringen Verschmutzungsgrad, dann wird die der Geschirrspülmaschine zugeordnete Programmsteuereinrichtung so beeinflußt, daß die in diesem Falle verkürzbaren Programmabschnitte übërsprungen bzw. das Einschalten der Entleerungspumpe verhindert wird.For the advantageous practice of the method, a sensor is arranged in the dishwasher in a dishwasher, which responds to changes that result from the degree of contamination of the washing liquid. If the sensor detects a low degree of contamination, the program control device assigned to the dishwasher is influenced in such a way that the program sections which can be shortened in this case are skipped or the emptying pump is prevented from being switched on.

Die Erfindung ist nachfolgend anhand von Skizzen eines Ausführungsbeispiels näher erläutert.The invention is explained in more detail below with the aid of sketches of an exemplary embodiment.

Es zeigen:

  • Figur 1: Eine Prinzipdarstellung einer Geschirrspülmaschine mit Steuereinrichtungen für einen verkürzten Programmablauf und
  • Figur 2: Ein Schema eines ungekürzten Programmablaufs sowie
  • Figur 3 ein Schema für einen verkürzten Programmablauf.
Show it:
  • Figure 1: A schematic diagram of a dishwasher with control devices for a shortened program and
  • Figure 2: A schematic of an unabridged program flow as well
  • Figure 3 is a schematic for a shortened program flow.

Im Spülgutbehälter (1) einer Geschirrspülmaschine befindet sich ein oberer Sprüharm (2) und ein unterer Sprüharm (3), die über zugehörige Druckleitungen (4 bzw. 5) mit Spülflüssigkeit gespeist werden. Die Druckleitungen (4,5) zweigen von einer Strömungsumsteuervorrichtung (6), zum Beispiel einem kontinuierlich umlaufenden Drehschieber ab, der an den Druckstutzen (7) einer Umwälzpumpe (8) angeschlossen ist. Von der Umwälzpumpe (8) führt ein Ansaugstutzen (9) in eine Ablaufwanne (10), die im Boden (11) des Spülgutbehälters (1) vorgesehen und durch ein trichterförmiges Feinsieb (12) zum Innenraum (13) des Spülgutbehälters (1) hin abgedeckt ist. Das Feinsieb (12) eht im unteren Teil in einen zylindrischen, senkrecht nach unten gerichteten Feinsiebzylinder (14) über, der in einen Ablaufschacht (15) mündet. Vom Ablaufschacht (15) führt ein Ablaufstutzen (16) zu einer nicht dargestellten Entleerungspumpe. Innerhalb des Feinsiebzylinders (14) befindet sich ein Grobsieb (17). Das Füllen des Spülgutbehälters mit Flüssigkeit erfolgt über eine Wasserleitung (18) mit eingeschaltetem steuerbarem Ventil (19), das über eine auch die Umwälzpumpe (8) und andere elektrische Bautteile steuernden Programmschalteinrichtung (20) gesteuert wird.In the washware container (1) of a dishwasher there is an upper spray arm (2) and a lower spray arm (3), which are fed with washing liquid via associated pressure lines (4 and 5). The pressure lines (4, 5) branch off from a flow reversing device (6), for example a continuously rotating rotary valve, which is connected to the pressure port (7) of a circulation pump (8). From the circulating pump (8), an intake (9) leads into a drain pan (10) provided in the bottom (11) of the washware container (1) and through funnel-shaped fine sieve (12) towards the interior (13) of the washware container (1) is covered. The fine sieve (12) is in the lower part in a cylindrical, vertically downward fine sieve cylinder (14) which opens into a drain shaft (15). A drain connection (16) leads from the drain shaft (15) to an emptying pump, not shown. A coarse sieve (17) is located within the fine sieve cylinder (14). The washware container is filled with liquid via a water line (18) with the controllable valve (19) switched on, which is controlled by a program switching device (20) that also controls the circulation pump (8) and other electrical components.

Um den Verschmutzungsgrad der Spülflüssigkeit, die durch den Zusatz von Spülmittel zum eingefüllten Wasser erzeugt wird in den aufeinanderfolgenden Spülgängen des von der Programmschalteinrichtung (20) gesteuerten Gesamtspülprogramms während der Reinigung von verschmutzten Gütern zu ermitteln, ist im Spülsystem wenigstens ein Sensor (21) -ngeordnet, der ein vom ermittelten Verschmutzungsgrad abhängiges Steuersignal an die Programmschalteinrichtung abgibt. Dabei können in unterschiedlichen Spülgängen auch unterschiedliche Verschmutzungsgrade als Ausgangsbasis für die Feststellung eines minderen bzw. erhöhten Verschmutzungsgrades vorbestimmt werden.In order to determine the degree of contamination of the washing liquid, which is generated by the addition of washing-up liquid to the filled water, in the successive washing steps of the overall washing program controlled by the program switching device (20) during the cleaning of dirty goods, at least one sensor (21) is arranged in the washing system which outputs a control signal dependent on the determined degree of contamination to the program switching device. Different degrees of soiling can also be predetermined in different rinse cycles as a starting point for the determination of a lower or increased level of soiling.

Der Sensor (21) kann dabei als Drucksensor (21.1) ausgebildet werden, der an den Druckstutzen der Umwälzpumpe angeschlossen ist. Es können jedoch auch Drucksensoren (21.2 bzw. 21.3) an die Druckleitungen (4) bzw. (5) zu den Sprüharmen (2) bzw. (3) angeschlossen werden. Auch kann ein Drucksensor (21.4) dem Ansaugstutzen (9) der Umwälzpumpe (8) zugeordnet werden. Der Sensor (21) kann jedoch auch als optischer Sensor ausgebildet sein und auf die Trübung der Spülflüssigkeit ansprechen. Daneben ist es aber auch möglich, mit dem Sensor (21) die Wichte der Spülflüssigkeit oder die Strömungsgeschwindigkeit der Spülflüssigkeit zu erfassen. Es kann jedoch auch mit einem Sensor (21.5) die Drehzahl der Sprüharme (2 bzw. 3) abgetastet werden. Ebenso kann mit einem Sensor (21.6) die leistungsabhänige Drehzahl der Umwälzpumpe (8) oder die Stromaufnahme des Antriebsmotors für die Umwälzpumpe (8) erfaßt werden. Schließlich ist es auch möglich, das im Spülbetrieb sich einstellende dynamische Arbeitsniveau des Flüssigkeitsstandes in der Ablaufwanne (10) abzutasten, das sich mit dem Verschmutzungsgrad ändert. Ferner kann im Spülflüssigkeitsweg, insbesondere im Rohrsystem ein Beipaßweg vorgesehen werden, in dem ein Filtersieb angeordnet ist, wobei ein Drucksensor den am Filtersieb auftretenden Druckverlust oder Staudruck misst. Dieses Filtersieb muß nach jedem Spülgang freigespült werden, um Verfälschungen des Meßergebnisses aus vorausgehenden Spülgängen zu vermeiden.The sensor (21) can be designed as a pressure sensor (21.1) which is connected to the pressure port of the circulation pump. However, pressure sensors (21.2 or 21.3) can also be connected to the pressure lines (4) or (5) to the spray arms (2) or (3). A pressure sensor (21.4) can also be assigned to the intake port (9) of the circulation pump (8). However, the sensor (21) can also be designed as an optical sensor and respond to the turbidity of the rinsing liquid. In addition, it is also possible to use the sensor (21) to record the weight of the washing liquid or the flow rate of the washing liquid. However, the speed of the spray arms (2 or 3) can also be scanned with a sensor (21.5). The power-dependent speed of the circulation pump (8) or the current consumption of the drive motor for the circulation pump (8) can also be detected with a sensor (21.6). Finally, it is also possible to adjust the dynamic working level of the liquid level in the drain pan (10) during the flushing operation. to sense that changes with the degree of pollution. Furthermore, a bypass path can be provided in the flushing liquid path, in particular in the pipe system, in which a filter screen is arranged, a pressure sensor measuring the pressure loss or dynamic pressure occurring on the filter screen. This filter screen must be rinsed free after each rinse cycle in order to avoid falsification of the measurement result from previous rinse cycles.

Zu Beginn eines Spülganges wird die Spülflüssigkeit praktisch mit dem Verschmutzungsgrad 0 im Spülsystem umgepumpt. Wird beispielsweise der Drucksensor (21.1) zur Ermittlung des Verschmutzungsgrades herangezogen, dann steht daran zunächst der maximal erreichbare Druck im Spülsystem an. Fällt dieser Druck im Laufe des jeweils abzuarbeitenden Spülganges unter einen vorbestimmten Wert, der im Vorspülgang anders als im Reinigungsgang sein kann, dann bedeutet das eine normale oder erhöhte Verschmutzung des zu spülenden Gutes. Es besteht dann kein Anlaß dazu, ein übliches Grundspülprogramm gemäß Figur 2 abzuändern. Demnach wird nach dem Zulauf von Wasser für den Vorspülgang der von der Programmschalteinrichtung vorgegebene komplette Vorspülgang ausgeführt. Nachdem die im Verlauf des Vorspülganges verfolgte Druckmessung einen normalen bis hohen Verschmutzungsgrad signalisiert, wird der Vorspülgang bis zum Ende abgearbeitet. Es erfolgt dort eine Entleerung der schmutzbeladenen Spülflüssigkeit und ein erneuter Zulauf von Frischwasser für den nachfolgenden Reinigungsgang. Ergibt die vorzugsweise am Ende des Aufheizvorganges für die Reinigungsflüssigkeit erfolgende Druckmessung wieder einen normalen bis erhöhten Verschmutzungsgrad, wird eine teilweise Entleerung von Spülflüssigkeit über die Entleerungspumpe vorgenommen. Dabei wird insbesondere der im Grobsieb und im Ablaufschacht angesammelte Hauptteil von Verschmutzungen aus der Spülflüssigkeit entfernt und anschließend der Spülflüssigkeitspegel wieder auf das Ausgangsniveau aufgefüllt, sowie der laufende Reinigungsgang bis zum maximalen, von der Programmschalteinrichtung (20) vorgegebenen End. weitergeführt. Es fügen sich dann jeweils nach einer Entleerung und erneutem Zulauf von Wasser beispielsweise zwei Zwischenspülgänge und ein Klarspülgang an, wobei in letzterem die Spülflüssigkeit wieder aufgeheizt wird, damit das zu spülende Gut für den anschließenden Trockengang am Ende des Gesamtspülganges getrocknet aus der Geschirrspülmaschine entnommen werden kann.At the beginning of a rinse cycle, the rinsing liquid with a pollution degree of 0 is practically pumped around in the rinsing system. If, for example, the pressure sensor (21.1) is used to determine the degree of contamination, then the maximum achievable pressure in the flushing system is present. If this pressure falls below a predetermined value in the course of the respective rinse cycle to be processed, which can be different in the pre-rinse cycle than in the cleaning cycle, this means normal or increased contamination of the items to be rinsed. There is then no reason to change a normal basic washing program according to FIG. 2. Accordingly, after the inflow of water for the pre-rinse cycle, the complete pre-rinse cycle specified by the program switching device is carried out. After the pressure measurement followed in the course of the pre-rinse cycle signals a normal to high degree of contamination, the pre-rinse cycle is processed to the end. The dirt-laden rinsing liquid is emptied there and fresh water is added again for the subsequent cleaning cycle. If the pressure measurement, which preferably takes place at the end of the heating process for the cleaning liquid, again results in a normal to increased degree of contamination, a partial emptying of the washing liquid is carried out via the emptying pump. In particular, the main part of the dirt collected in the coarse sieve and in the drain shaft is removed from the rinsing liquid and then the rinsing liquid level is refilled to the initial level, as well as the ongoing cleaning cycle up to the maximum end specified by the program switching device (20). continued. Then, for example, two intermediate rinse cycles and a rinse cycle, for example after each emptying and re-supply of water, are added, the rinsing liquid being heated up again in the latter, so that the washing good for the subsequent drying cycle at the end of the total washing cycle can be removed from the dishwasher.

Wird über den Sensor (21) eine unter einem vorbestimmten Wert liegende Verschmutzung im Vorspülgang ermittelt, dann wird gemäß Figur 3 ab dem Zeitpunkt der Auswertung der Druckmessung die restliche Zeitdauer des Vorspülganges im Programmablauf ausgeblendet bzw. überfahren. Ist der Verschmutzungsgrad sehr gering, dann kann die Spülflüssigkeit aus dem Vorspülgang unmittelbar für den nachfolgenden Reinigungsgang verwendet werden. Es braucht dann kein aus Entleerung und Zulauf bestehender Wasserwechsel vorgenommen zu werden. Bei höherem, jedoch unter dem Normalwert liegenden Verschmutzungsgrad ist es zweckmäßig, einen Wasserwechsel vorzunehmen. In jedem Fall wird dann jedoch die Programmablaufdauer um den ausgeblendeten Teil des Vorspülganges verkürzt. Wird im nachfolgenden Reinigungsang zum Zeitpunkt der Druckmessung ein unterhalb des Normalwertes liegender Verschmutzungsgrad festgestellt, dann kann der Teilwasserwechsel nach dem Aufheizen der Reinigungsflüssigkeit entfallen und zumindest der für den Wasserwechsel erforderliche Programmzeitabschnitt ausgeblendet werden. Gegebenenfalls kann dabei auch der Zeitraum verkürzt werden, in dem das Geschirr nach dem Ende der Aufheizphase weitergespült wird. Diese Weiterspüldauer kann abhängig vom Verschmutzungsgrad gewählt werden. Am Ende des Reinigungsganges erfolgt wieder ein Wasserwechsel, wobei einer der Zwischenspülgänge ausgeblendet wird. Danach folgt in unverändertem Programmablauf der Klarspülgang und Trockengang. Soweit in den ausgeblendeten Teilen von Spülgängen keine Heizenergie eingespart wird, ergibt sich jedoch durch den entsprechend verkürzten Lauf der Umwälzpumpe neben dem eingesparten Wasser auch eine Verminderung der Antriebsenergie für die Umwälzpumpe und insgesamt ein verkürzter Spülprogrammablauf.If contamination in the pre-rinse cycle, which is below a predetermined value, is determined by the sensor (21), then according to FIG. 3, the remaining time of the pre-rinse cycle is faded out or run over in the program sequence from the time the pressure measurement is evaluated. If the degree of contamination is very low, the rinsing liquid from the pre-rinse cycle can be used immediately for the subsequent cleaning cycle. There is then no need to change the water from emptying and supplying. If the degree of soiling is higher but below the normal value, it is advisable to change the water. In any case, however, the duration of the program will be reduced by the hidden part of the pre-wash cycle. If a degree of soiling below the normal value is determined in the subsequent cleaning cycle at the time of the pressure measurement, then the partial water change after heating up the cleaning liquid can be omitted and at least the program time period required for the water change can be hidden. If necessary, the period in which the dishes are washed further after the end of the heating phase can also be shortened. This rinsing time can be selected depending on the degree of contamination. At the end of the cleaning cycle, the water is changed again, one of the intermediate rinsing cycles being hidden. This is followed by the rinse and drying cycle in the same program. Insofar as no heating energy is saved in the hidden parts of the rinsing cycles, the correspondingly shortened running of the circulation pump results in a reduction in the drive energy for the circulation pump and a shortened washing program sequence in addition to the water saved.

Da sich bei ändernden Druckverhältnissen im Spülsystem auch die Geschwindigkeit der Spülflüssigeit verändert, kann der Verschmutzungsgrad über einen auf die Strömungsgeschwindigkeit ansprechenden Sensor ermittelt werden.Since the speed of the flushing liquid also changes with changing pressure conditions in the flushing system, the degree of contamination can be determined by a sensor that responds to the flow speed.

Bei sich ändernden Druckverhältnissen im Spülsystem verändert sich aber auch die Umlaufgeschwindigkeit der durch Rückstoß angetriebenen Sprüharme, so daß deren Drehgeschwindigkeit ebenfalls ein Maß für den Verschmutzungsgrad sein kann. Außerdem ändert sich mit der vom Verschmutzungsgrad abhängigen Dichte der Spülflüssigkeit der Leistungsbedarf für den Antriebsmotor der Umwälzpumpe, so daß sich über deren Drehzahl oder Stromaufnahme ebenfalls durch entsprechende Sensoren der Verschmutzungsgrad ermitteln läßt. Ferner ändert sich bei unterschiedlichem Fördervolumen der Umwälzpumpe auch der Flüssigkeitsstand in der Ablaufwanne, so daß hieraus über einen Niveausensor (21.7) der Verschmutzungsgrad ermittelt werden kann.With changing pressure conditions in the flushing system, however, the rotational speed of the spray arms driven by recoil also changes, so that their rotational speed can also be a measure of the degree of contamination. In addition, the power requirement for the drive motor of the circulating pump changes with the density of the rinsing liquid, which is dependent on the degree of contamination, so that the degree of contamination can also be determined by appropriate sensors via its speed or current consumption. Furthermore, the liquid level in the drain pan changes with different delivery volumes of the circulation pump, so that the level of contamination can be determined from this using a level sensor (21.7).

Claims (11)

1. Verfahren zum Betreiben einer Geschirrspülmaschine, bei dem in einem Spülgang des mehrgängigen Gesamtspülganges der Verschmutzungsgrad der Spülflüssigkeit ermittelt sowie bei gegenüber einem vorbestimmten Verschmutzungsgrad abweichendem Verschmutzungsgrad Einfluß auf die Spülflüssigkeit genommen wird, und zwischen unterschiedlichen Spülgängen Spülflüssigkeitswechsel vorgenommen werden, dadurch gekennzeichnet, daß nach der Ermittlung eines minderen Verschmutzungsgrades wenigstens einer der im Gesamtspülprogramm nachfolgenden kompletten Spülflüssigkeitswechsel oder Teilspülflüssigkeitswechsel ausgeblendet wird.1. A method of operating a dishwasher, in which the degree of soiling of the washing liquid is determined in one wash cycle of the multi-course total wash cycle and influence is exerted on the washing liquid when the degree of soiling differs from a predetermined degree of soiling, and washing liquid changes are carried out between different washing cycles, characterized in that after Determination of a lower degree of contamination of at least one of the subsequent complete rinsing liquid changes or partial rinsing liquid changes in the overall washing program is hidden. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Ermittlung des Verschmutzungsgrades im Vorspülgang und im nachfolgenden Reinigungsspülgang erfolgt.2. The method according to claim 1, characterized in that the determination of the degree of contamination takes place in the pre-rinse cycle and in the subsequent cleaning rinse cycle. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei minderem Verschmutzungsgrad im Vorspülgang der unmittelbar folgende Spülflüssigkeitswechsel ausgeblendet wird.3. The method according to claim 1 or 2, characterized in that with a lower degree of contamination in the pre-wash cycle, the immediately following wash liquid change is hidden. 4. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß bei minderem Verschmutzungsgrad der Spülflüssigkeit im Reinigungsspülgang ein Spülflüssigkeitswechsel für wenigstens einen nachfolgenden Zwischenspülgang ausgeblendet wird.4. The method according to claim 1 or one of the following, characterized in that with a lower degree of contamination of the rinsing liquid in the cleaning rinse a rinse liquid change is hidden for at least one subsequent intermediate rinse. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der ausgeblendete Zwischenspülgang im Programmablauf zeitlich übersprungen wird.5. The method according to claim 4, characterized in that the hidden intermediate rinse is skipped in time in the program sequence. 6. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der vorbestimmte Verschmutzungsgrad für die Spülgänge unterschiedlich einstellbar ist.6. The method according to claim 1 or one of the following, characterized in that the predetermined degree of contamination for the rinse cycles can be set differently. 7. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß bei unter dem vorbestimmten Wert liegender Verschmutzung der laufende Spülgang vorzeitig abgebrochen wird.7. The method according to claim 1 or one of the following, characterized in that if the contamination is below the predetermined value, the current rinse cycle is stopped prematurely. 8. Geschirrspülmaschine zur Ausübung des Verfahrens nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß im Spülflüssigkeitsweg (4-9) ein Sensor (21) angeordnet ist, der auf Arbeitsniveauabweichungen und/oder auf Trübung, und/oder die Wichte und/oder den Druck und/oder die Strömungsgeschwindigkeit der Spülflüssigkeit anspricht sowie bei unter einem Grenzwert liegender Trübung bzw. Wichte bzw. des Drucks oder der Strömungsgeschwindigkeit der Spülflüssigkeit ein Signal abgibt, das einen im Spülprogramm nachfolgenden Spülflüssigkeitswechsel unterbindet bzw. das Programmschaltwerk über den unmittelbar folgenden Programmschritt hinwegschaltet.8. Dishwasher for carrying out the method according to claim 1 or one of the following, characterized in that a sensor (21) is arranged in the rinsing liquid path (4-9), which on working level deviations and / or on turbidity, and / or the weights and / / or the pressure and / or the flow rate of the rinsing liquid and, if the turbidity or weights are below a threshold value or the pressure or the flow rate of the rinsing liquid, emits a signal which prevents a subsequent rinsing liquid change in the rinsing program or the program switch via the immediately following program step switches away. 9. Geschirrspülmaschine nach Anspruch 8, dadurch gekennzeichnet, daß im Spülflüssigkeitsweg ein Bypaßweg vorgesehen ist, in dem ein Filtersieb angeordnet ist und daß der Drucksensor dem Bypaßweg zugeordnet ist.9. Dishwasher according to claim 8, characterized in that a bypass path is provided in the rinsing liquid path, in which a filter screen is arranged and that the pressure sensor is assigned to the bypass path. 10. Geschirrspülmaschine nach Anspruch 9, dadurch gekennzeichnet, daß das Filtersieb nach jedem Spülgang freigespült wird.10. Dishwasher according to claim 9, characterized in that the filter screen is washed free after each wash cycle. 11. Geschirrspülmaschine nach Anspruch 8, dadurch gekennzeichnet, daß der Sensor (21.5; 21.6) die Drehzahl der Sprüharme (2,3) oder der Umwälzpumpe (8) bzw. deren Leistungsaufnahme abtastet.11. Dishwasher according to claim 8, characterized in that the sensor (21.5; 21.6) scans the speed of the spray arms (2,3) or the circulation pump (8) or their power consumption.
EP87109160A 1986-08-04 1987-06-25 Dishwashing machine Expired - Lifetime EP0255863B1 (en)

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EP1036888A2 (en) * 1999-03-18 2000-09-20 Hansgrohe AG Method and device for the reuse of grey water
EP1036888A3 (en) * 1999-03-18 2001-07-25 Hansgrohe AG Method and device for the reuse of grey water
EP1464268A3 (en) * 2003-04-01 2008-10-15 Electrolux Home Products Corporation N.V. Process for detecting the charge of the strainer arrangement of a dishwasher
WO2004096006A2 (en) * 2003-04-29 2004-11-11 Indesit Company S.P.A. Improved wash method, and dishwashing machine implementing such a method
WO2004096006A3 (en) * 2003-04-29 2005-03-31 Indesit Co Spa Improved wash method, and dishwashing machine implementing such a method
EP1699340B2 (en) † 2003-12-16 2020-06-17 BSH Hausgeräte GmbH Dishwasher with an intermediate pump mode
US8439052B2 (en) 2004-01-23 2013-05-14 Bsh Bosch Und Siemens Hausgeraete Gmbh Liquid-conducting electrical household appliance
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EP1929925A3 (en) * 2006-12-04 2009-04-15 Samsung Electronics Co., Ltd. Washing control apparatus and method of dish washing machine
EP2179684A1 (en) * 2008-10-22 2010-04-28 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. A washing method for dishwashers
WO2010112331A2 (en) 2009-04-02 2010-10-07 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a water conducting household device
WO2010112331A3 (en) * 2009-04-02 2010-11-25 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a water conducting household device
EP2263512B1 (en) 2009-06-17 2015-06-17 Bonferraro S.p.A. Hood-type industrial dishwasher with improved filter assembly

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DE3626351A1 (en) 1988-02-11
DE3780097D1 (en) 1992-08-06
EP0255863B1 (en) 1992-07-01
DE3626351C2 (en) 1992-08-06
EP0255863A3 (en) 1989-03-15
ES2033741T3 (en) 1993-04-01

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