EP1252856B1 - Method for washing dishes - Google Patents

Method for washing dishes Download PDF

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Publication number
EP1252856B1
EP1252856B1 EP02008601A EP02008601A EP1252856B1 EP 1252856 B1 EP1252856 B1 EP 1252856B1 EP 02008601 A EP02008601 A EP 02008601A EP 02008601 A EP02008601 A EP 02008601A EP 1252856 B1 EP1252856 B1 EP 1252856B1
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EP
European Patent Office
Prior art keywords
spraying
pressure
washing
corner regions
spray
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EP02008601A
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German (de)
French (fr)
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EP1252856A3 (en
EP1252856A2 (en
Inventor
Günther Dr. Ennen
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Miele und Cie KG
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Miele und Cie KG
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    • 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
    • A47L15/14—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
    • 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
    • A47L2401/24—Spray arms status, e.g. detection of spray arm rotation
    • 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
    • A47L2501/03—Water recirculation, e.g. control of distributing valves for redirection of water flow
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/04—Water pressure or flow rate
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction

Definitions

  • the invention relates to a method for rinsing items to be washed in a microprocessor-controlled dishwasher, comprising at least one spray arm, the spray nozzles and is rotatably supported in a rectangular washing space on an axis, wherein the spray arm is fed by a circulating pump via a pipe with rinsing liquid and with a Sensor and evaluation is coupled.
  • the German Offenlegungsschrift DE 198 32 982 A1 improves the cleaning effect in the corners and prevents high water consumption by using a specially designed spray arm. It has two separate hollow channels, each hollow channel leading at least to a spray nozzle and in particular a hollow channel to at least one corner nozzle at the end of the spray arm. In this case, the hollow channel is formed to the corner nozzles so that a spraying of the items to be washed by the corner nozzle, only in the corner areas of the dishwasher is possible.
  • the invention thus has the object of disclosing a method for rinsing items to be washed in a microprocessor-controlled dishwasher, which can be optimally cleaned in the baskets in the rinse container in a crockery basket ware without complex design modifications to Besprühungssystem, such as spray nozzle and spray arm ,
  • the inventive method can be carried out alone with the already existing components of a microprocessor-controlled dishwasher, which has a Sprüharmsenstechnik. It leads cost-effectively and easily to an improved cleaning effect in the corners of the dishwasher.
  • the spray pressure can be realized very simply by changing the flow geometry of the waterways to the spray room.
  • the examples of pressure control described above make it clear that the cleaning effect is improved by the method according to the invention in the corner areas of the washing compartment solely by simple means.
  • the dishwashing machine (1) shown in FIG. 1 has two dishwashing baskets (3, 4) arranged one above the other in a rectangular washing compartment (2), wherein a cutlery drawer (5) is arranged above the upper basket (4).
  • a cutlery basket in one of the dishwashing baskets (3, 4) instead of the cutlery drawer (5).
  • a spray arm (7, 8) is rotatably mounted on a water-carrying axis (6a, 6b) in each case in the rectangular washing container, a third spray arm (9) being mounted on a further axis (6c). above the cutlery drawer (5) rotates.
  • the rotatable spray arms (7, 8, 9) are provided with spray nozzles (13), which are arranged in such a way that all rinsing material in the baskets (3, 4, 5) is acted upon by the rinsing liquid emerging from the nozzles.
  • the spray arms (7 to 9) are supplied by a circulation pump (11) via pipes (10) with rinsing liquid.
  • the circulating pump (11) is connected via a pipe to the lowest point of the cuboid Spülraums (2) and sucks the water collected there over known per se filter and presses it again through the nozzles (13) of the spray arms (7,8,9 ), wherein a self-adjusting from the Spülckenkeitsaustritt recoil force leads to the rotation of the spray arms (7,8,9).
  • the dishwashing machine (1) shown in a very simplified manner has a sensor and evaluation device (14) shown in FIG. 2 for detecting the rotational position of the spray arm (8).
  • This device (14) consists of at least one actuator and a sensor.
  • PM permanent magnet
  • D sensor magnet-sensitive detector
  • the signal is sent to the microprocessor controller ( ⁇ c) of the dishwasher for evaluation. This checks with the signal the rotation of the spray arm. Further, the microprocessor controller ( ⁇ c) monitors the position of the spray arm (8). For this purpose, the time difference between two signals is evaluated. From the time difference and the known circulation distance of the magnet (PM), the microprocessor control ( ⁇ c) calculates the positions at which the spray arm ends are located in the corner regions (E) of the washing compartment (2) during undisturbed spraying arm rotation.
  • the position detection can also be performed with multiple sensors and / or actuators.
  • the beginning of corner regions (E) by detectors (D) could be marked so that a time measurement between two signals is not necessary.
  • the recognition method used here is used to increase the spray pressure (p) of the rinsing liquid, shown in simplified form in FIG. 3, when the spray arm (8) passes through critical corner regions (E) of the rinsing chamber (2) so as to achieve an optimum cleaning effect.
  • the items to be washed arranged in baskets (3, 4, 5) are now hit with increased spray pressure (p), whereby the resulting height of the spray jet is increased and the entire items to be washed are wetted with sufficient rinsing liquid.
  • the spray pressure (p) is advantageously increased from a normal pressure (p 0 ) in corner regions (E) so that it reaches its maximum (p max ) precisely when one end of the spray arm (8 ) on a corner of the dishwasher (1).
  • an increased spray pressure (p) is important because here the distance between the Ecksprühdüsen (13) and the arranged in the corners items is maximum.
  • the exemplary diagram of the pressure curve (p) according to FIG. 3 shows a very simple linear pressure profile which has a uniform rise and fall in the corner regions (E).
  • a variety of other pressure curves, which have a maximum in the corner regions (E) leads to the improved cleaning effect.
  • Such is for example Also, a pressure curve conceivable that is proportional to the distance from the Sprüharmende to the Spül electerwand.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manipulator (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

The method involves operating a rotating spray arm (8) with increased spraying pressure as it passes the corner regions of the rectangular cleaning chamber (2) compared to the normal spraying pressure. A sensor and evaluation device (14) determines the time at which the spray arm is pointing to the corner region (E) and at which increased spraying pressure is to be used.

Description

Die Erfindung betrifft ein Verfahren zum Spülen von Spülgut in einer mikroprozessorgesteuerten Geschirrspülmaschine, mit mindestens einem Sprüharm, der Sprühdüsen aufweist und in einem rechteckigen Spülraum drehbar auf einer Achse gelagert ist, wobei der Sprüharm von einer Umwälzpumpe über eine Rohrleitung mit Spülflüssigkeit gespeist wird und mit einer Sensor- und Auswerteeinrichtung gekoppelt ist.The invention relates to a method for rinsing items to be washed in a microprocessor-controlled dishwasher, comprising at least one spray arm, the spray nozzles and is rotatably supported in a rectangular washing space on an axis, wherein the spray arm is fed by a circulating pump via a pipe with rinsing liquid and with a Sensor and evaluation is coupled.

Die meisten Geschirrspülmaschinen für den Haushaltsbereich weisen in einem quaderförmigen Spülraum einen Unter- und einen Obergeschirrkorb auf. Um das in den Geschirrkörben sortierte Spülgut mit Spülflüssigkeit zu beaufschlagen, ist es üblich, mindestens einen auf einer wasserführenden Achse drehbar gelagerten Sprüharm im Spülraum anzuordnen. Auf dem kanalförmig ausgeprägten Sprüharm sind Sprühdüsen so platziert, dass das Spülgut möglichst gleichmäßig mit Spülflüssigkeit besprüht und eine optimale Reinigungswirkung erzielt wird. Dabei wird die Spülflüssigkeit mittels der Umwälzpumpe unter Druck über die Rohrleitung, der wasserführenden Achse und den kanalförmigen Sprüharm durch die Sprühdüsen in den Sprühraum eingesprüht. Bei diesem Verfahren ist das in den Eckbereichen angeordnete Spülgut oftmals nur unzureichend gereinigt. Begründet ist das lokale Reinigungsdefizit durch eine mangelnde Benetzung des Spülguts in den Eckbereichen des rechteckigen Spülraums. Dies resultiert aus dem kreisförmigen Arbeitsbereich des Sprüharms, der nicht mit der rechteckigen Spülraumfläche übereinstimmt.Most dishwashers for household use have in a cuboid Spülraum a lower and a crockery basket. In order to charge the items to be washed sorted in the dish racks with rinsing liquid, it is customary to arrange at least one spray arm rotatably mounted on a water-carrying axis in the rinsing space. On the channel-shaped spray arm spray nozzles are placed so that the items sprayed as flush as possible with rinsing liquid and an optimal cleaning effect is achieved. The rinsing liquid is sprayed by means of the circulation pump under pressure through the pipeline, the water-bearing axis and the channel-shaped spray arm through the spray nozzles in the spray room. In this method, arranged in the corner areas wash items is often insufficiently cleaned. The reason for the local cleaning deficit is a lack of wetting of the items to be washed in the corner areas of the rectangular washing area. This results from the circular working area of the spray arm, which does not coincide with the rectangular Spülraumfläche.

Aus der europäischen Patentanmeldung EP 0 559 466 A1 ist es an sich bekannt, den Sprühbereich eines Sprüharmes durch die Anordnung von vier zusätzlichen speziell ausgebildeten Hilfssprüharmen, die auch die Spülraumecken mit erreichen, zu erweitern. Dabei wird die Spülflüssigkeit der Hilfssprüharme mit einer zusätzlichen Pumpe gefördert. Eine solche Lösung ist kostenintensiv, da eine zusätzliche Pumpe sowie zusätzliche Sprüharme benötigt werden. Des weiteren kann sich durch die partielle Überlagerung der Arbeitsbereiche der Sprüharme der Wasserverbrauch unvorteilhaft erhöhen.From the European Patent Application EP 0 559 466 A1 It is known per se to extend the spray area of a spray arm by the arrangement of four additional specially trained Hilfssprüharmen, which also reach the Spülraumecken with. The rinsing liquid of the auxiliary spray arms is conveyed with an additional pump. Such a solution is costly because an additional pump and additional spray arms are needed. Furthermore, the partial superposition of the working areas of the spray arms can disadvantageously increase the water consumption.

Aus dem deutschen Gebrauchsmuster DE 297 18 777 U1 ist es bekannt, die mangelnde Benetzung des Spülguts mit Spülflüssigkeit in den Ecken einer Geschirrspülmaschine durch die Anbringung eines einzigen Hilfssprüharms zu verbessern. Der genannte Hilfssprüharm ist drehbar auf einem Ende des Hauptsprüharms gelagert. Er streicht aufgrund der Zentrifugalkraft, die durch die Rotation des Hauptsprüharms verursacht ist, jeweils an den Wänden des Spülraums entlang. Auch bei dieser Lösung ist der Gesamtwasserverbrauch sehr hoch, da sich der Hilfssprüharm außerhalb der Ecken des Spülraumes, in gewinkelter Stellung an der Wand bewegt und somit eine große Menge an Spülflüssigkeit in wandnahen Bereichen abgeführt wird, wo sie nicht benötigt wird.From the German utility model DE 297 18 777 U1 It is known to improve the lack of wetting of the items to be washed with rinsing liquid in the corners of a dishwasher by the attachment of a single Hilfssprüharms. The said auxiliary spray arm is rotatably supported on one end of the main spray arm. It sweeps along the walls of the washing compartment due to the centrifugal force caused by the rotation of the main spray arm. Even with this solution, the total water consumption is very high, as the Hilfssprüharm outside the corners of the washing compartment, in an angled position on the wall moved and thus a large amount of flushing liquid is dissipated in near-wall areas where it is not needed.

Die deutsche Offenlegungsschrift DE 198 32 982 A1 verbessert die Reinigungswirkung in den Eckbereichen und verhindert einen hohen Wasserverbrauch, indem ein speziell ausgebildeter Sprüharm verwendet wird. Er weist zwei getrennte Hohlkanäle auf, wobei jeder Hohlkanal mindestens zu einer Sprühdüse und insbesondere ein Hohlkanal zu mindestens einer Eckdüse am Ende des Sprüharms führt. Dabei ist der Hohlkanal zu den Eckdüsen so ausgebildet, dass eine Besprühung des Spülgutes durch die Eckdüse, nur in den Eckbereichen der Spülmaschine möglich ist.The German Offenlegungsschrift DE 198 32 982 A1 improves the cleaning effect in the corners and prevents high water consumption by using a specially designed spray arm. It has two separate hollow channels, each hollow channel leading at least to a spray nozzle and in particular a hollow channel to at least one corner nozzle at the end of the spray arm. In this case, the hollow channel is formed to the corner nozzles so that a spraying of the items to be washed by the corner nozzle, only in the corner areas of the dishwasher is possible.

Die vorgestellten Lösungen verbessern die Reinigungswirkung des Spülguts in den Eckbereichen durch zusätzliche Sprüharme oder Modifikationen an bestehenden Besprühungsarmen. Sie sind besonders aufwendig und verursachen hohe Kosten in der Fertigung und/oder im Betrieb der Spülmaschine.The solutions presented improve the cleaning action of the dishes in the corner areas by additional spray arms or modifications to existing Besprühungsemmen. They are particularly expensive and cause high costs in the production and / or operation of the dishwasher.

Der Erfindung stellt sich somit die Aufgabe, ein Verfahren zum Spülen von Spülgut in einer mikroprozessorgesteuerten Spülmaschine zu offenbaren, mit welchem ohne aufwendige konstruktive Modifikationen am Besprühungssystem, beispielsweise Sprühdüse und Sprüharm, auch in den Eckbereichen im Spülbehälter in einem Geschirrkorb angelegtes Spülgut optimal gereinigt werden kann.The invention thus has the object of disclosing a method for rinsing items to be washed in a microprocessor-controlled dishwasher, which can be optimally cleaned in the baskets in the rinse container in a crockery basket ware without complex design modifications to Besprühungssystem, such as spray nozzle and spray arm ,

Erfindungsgemäß wird die Aufgabe durch ein Verfahren mit den Merkmalen des Patentanspruches 1 gelöst.According to the invention the object is achieved by a method having the features of claim 1.

Das erfindungsgemäße Verfahren kann alleine mit den bereits vorhandenen Bauteilen einer mikroprozessorgesteuerten Spülmaschine, die eine Sprüharmsensierung aufweist, durchgeführt werden. Es führt kostengünstig und einfach zu einer verbesserten Reinigungswirkung in den Ecken der Spülmaschine.The inventive method can be carried out alone with the already existing components of a microprocessor-controlled dishwasher, which has a Sprüharmsensierung. It leads cost-effectively and easily to an improved cleaning effect in the corners of the dishwasher.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.Advantageous developments of the invention will become apparent from the following subclaims.

Hier werden Möglichkeiten zur Steuerung des Drucks des Sprühstrahls aufgeführt. Eine Möglichkeit den Druck über die Pumpenleistung, die im physikalischen Zusammenhang zur Pumpendrehzahl steht, zu steuern, ist besonders vorteilhaft, wenn die Geschirrspülmaschine mit einer modernen Pumpenelektronik; wie sie aus der Patentschrift DE 195 13 352 A1 bekannt ist, ausgestattet ist.Here are options for controlling the pressure of the spray jet listed. One way to control the pressure across the pump power, which is physically related to the pump speed, is particularly advantageous when the dishwasher is equipped with modern pump electronics; as they are from the Patent DE 195 13 352 A1 is known, is equipped.

Besonders vorteilhaft erweist sich hierbei ein relativ geringer Wasserverbrauch gegenüber einem Intensivspülprogramm, bei dem die Pumpendrehzahl während des gesamten Programms erhöht ist.Particularly advantageous here is a relatively low water consumption compared to a Intensivspülprogramm, in which the pump speed is increased throughout the program.

Nach einer weiteren Möglichkeit kann der Sprühdruck sehr einfach durch Veränderung der Strömungsgeometrie der Wasserwege zum Sprühraum realisiert werden. Hierbei bietet es sich an, den Austrittsquerschnitt der Rohrleitung, beispielsweise durch ein Elektromagnetventil, bei unverminderter Pumpendrehzahl immer dann kurzzeitig zu reduzieren, wenn die Enden des Sprüharms auf die Eckbereiche der Spülmaschine zeigen. Die oben beschriebenen Beispiele zur Drucksteuerung verdeutlichen, dass alleine durch einfache Mittel, die Reinigungswirkung durch das erfindungsgemäße Verfahren in den Eckenbereichen des Spülraums verbessert wird.According to another possibility, the spray pressure can be realized very simply by changing the flow geometry of the waterways to the spray room. In this case, it is advisable to reduce the outlet cross-section of the pipeline, for example by a solenoid valve, at an undiminished pump speed for a short time whenever the ends of the spray arm point to the corner regions of the dishwasher. The examples of pressure control described above make it clear that the cleaning effect is improved by the method according to the invention in the corner areas of the washing compartment solely by simple means.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
eine programmgesteuerte Spülmaschine mit einem Spülbehälter und Sprüharmen in vereinfachter schematischer Darstellung,
Figur 2
den Spülbehälter im Querschnitt mit einem Sprüharm in der Draufsicht sowie eine Steuerung für den Sprühstrahldruck in den Spülraum
Figur 3
ein Diagramm über einen Druckverlauf der Spülflüssigkeit in Abhängigkeit der Drehposition des Sprüharms.
An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows
FIG. 1
a program-controlled dishwasher with a washing container and spray arms in a simplified schematic representation,
FIG. 2
the rinse tank in cross section with a spray arm in the plan view and a controller for the spray jet pressure in the washing compartment
FIG. 3
a diagram of a pressure curve of the rinsing liquid as a function of the rotational position of the spray arm.

Die in Figur 1 dargestellte Geschirrspülmaschine (1) weist in einem rechteckigen Spülraum (2) zwei übereinander angeordnete Geschirrkörbe (3,4) auf, wobei oberhalb des Oberkorbs (4) eine Besteckschublade (5) angeordnet ist. Alternativ ist es auch bekannt, an Stelle der Besteckschublade (5) einen Besteckkorb in einem der Geschirrkörbe (3,4) zu integrieren. Unter dem Ober- (4) und Unterkorb (3) ist jeweils im eckigen Spülbehälter ein Sprüharm (7,8) drehbar auf einer wasserführenden Achse (6a, 6b) gelagert, wobei ein dritter Sprüharm (9) auf einer weiteren Achse (6c) oberhalb der Besteckschublade (5) rotiert.The dishwashing machine (1) shown in FIG. 1 has two dishwashing baskets (3, 4) arranged one above the other in a rectangular washing compartment (2), wherein a cutlery drawer (5) is arranged above the upper basket (4). Alternatively, it is also known to integrate a cutlery basket in one of the dishwashing baskets (3, 4) instead of the cutlery drawer (5). Under the upper (4) and lower basket (3), a spray arm (7, 8) is rotatably mounted on a water-carrying axis (6a, 6b) in each case in the rectangular washing container, a third spray arm (9) being mounted on a further axis (6c). above the cutlery drawer (5) rotates.

Die drehbaren Sprüharme (7,8,9) sind mit Sprühdüsen (13) versehen, die so angeordnet sind, dass das gesamte Spülgut in den Körben (3,4,5) von der aus den Düsen austretenden Spülflüssigkeit beaufschlagt wird. Dabei werden die Sprüharme (7 bis 9) von einer Umwälzpumpe (11) über Rohrleitungen (10) mit Spülflüssigkeit versorgt. Die Umwälzpumpe (11) ist über eine Rohrleitung mit dem tiefsten Punkt des quaderförmigen Spülraums (2) verbunden und saugt das dort gesammelte Wasser über an sich bekannte Filter an und drückt es erneut durch die Düsen (13) der Sprüharme (7,8,9), wobei eine sich aus dem Spülflüssigkeitsaustritt einstellende Rückstosskraft zur Rotation der Sprüharme (7,8,9) führt. Die sehr vereinfacht dargestellte Geschirrspülmaschine (1) besitzt zur Erkennung der Drehposition des Sprüharms (8) eine in Figur 2 dargestellte Sensor- und Auswerteeinrichtung (14). Diese Einrichtung (14) besteht aus mindestens einem Aktor und einem Sensor. Als Aktor wird ein Permanent-Magnet (PM) am Ende eines Sprüharmes (7,8,9) beispielsweise am Sprüharm (8) platziert. Zur Sprüharmsensierung ist ein als Sensor ausgebildeter magnetempfindlicher Detektor (D) an der Maschinentür (12) mittig angeordnet. Die mittige Anordnung ist vorteilhaft, da der Abstand zwischen der Kreisbahn, auf der sich der Magnet (PM) mit dem Sprüharm (8) bewegt, und den Wänden des Spülraums (2) an dieser Position minimal ist, so dass der Detektor (D) ein klares Signal vom Magneten (PM) erhält.The rotatable spray arms (7, 8, 9) are provided with spray nozzles (13), which are arranged in such a way that all rinsing material in the baskets (3, 4, 5) is acted upon by the rinsing liquid emerging from the nozzles. The spray arms (7 to 9) are supplied by a circulation pump (11) via pipes (10) with rinsing liquid. The circulating pump (11) is connected via a pipe to the lowest point of the cuboid Spülraums (2) and sucks the water collected there over known per se filter and presses it again through the nozzles (13) of the spray arms (7,8,9 ), wherein a self-adjusting from the Spülflüssigkeitsaustritt recoil force leads to the rotation of the spray arms (7,8,9). The dishwashing machine (1) shown in a very simplified manner has a sensor and evaluation device (14) shown in FIG. 2 for detecting the rotational position of the spray arm (8). This device (14) consists of at least one actuator and a sensor. As an actuator, a permanent magnet (PM) at the end of a spray arm (7,8,9), for example, placed on the spray arm (8). For Sprüharmsensierung designed as a sensor magnet-sensitive detector (D) on the machine door (12) is arranged centrally. The central arrangement is advantageous because the distance between the circular path on which the magnet (PM) moves with the spray arm (8) and the walls of the washing compartment (2) is minimal at this position, so that the detector (D) receives a clear signal from the magnet (PM).

Das Signal wird zur Auswertung an die Mikroprozessor-Steuerung (µc) der Geschirrspülmaschine geleitet. Diese überprüft mit dem Signal die Rotation des Sprüharms. Weiter überwacht die Mikroprozessor-Steuerung (µc) die Position des Sprüharms (8). Hierzu wird die Zeitdifferenz zwischen zwei Signalen ausgewertet. Aus der Zeitdifferenz und der bekannten Umlaufstrecke des Magneten (PM) berechnet die Mikroprozessor-Steuerung (µc) die Positionen an denen sich bei ungestörter Sprüharmrotation die Sprüharmenden jeweils in den Eckbereichen (E) des Spülraums (2) befinden.The signal is sent to the microprocessor controller (μc) of the dishwasher for evaluation. This checks with the signal the rotation of the spray arm. Further, the microprocessor controller (μc) monitors the position of the spray arm (8). For this purpose, the time difference between two signals is evaluated. From the time difference and the known circulation distance of the magnet (PM), the microprocessor control (μc) calculates the positions at which the spray arm ends are located in the corner regions (E) of the washing compartment (2) during undisturbed spraying arm rotation.

Selbstverständlich kann die Positionserkennung auch mit mehreren Sensoren und / oder Aktoren ausgeführt werden. Beispielsweise könnte der Beginn von Eckbereichen (E) durch Detektoren (D) so markiert werden, dass eine Zeitmessung zwischen zwei Signalen nicht notwendig ist.Of course, the position detection can also be performed with multiple sensors and / or actuators. For example, the beginning of corner regions (E) by detectors (D) could be marked so that a time measurement between two signals is not necessary.

Das hier verwendete Erkennungsverfahren wird dazu genutzt, den in Figur 3 vereinfacht dargestellten Sprühdruck (p) der Spülflüssigkeit dann zu erhöhen, wenn der Sprüharm (8) kritische Eckbereiche (E) des Spülraums (2) durchfährt, um so eine optimale Reinigungswirkung zu erreichen. Das in den Eckbereichen (E) in Körben (3,4,5) angeordnete Spülgut wird nun mit erhöhtem Sprühdruck (p) getroffen, wobei die daraus resultierende Höhe des Sprühstrahls erhöht und das gesamte Spülgut mit genügend Spülflüssigkeit benetzt wird.The recognition method used here is used to increase the spray pressure (p) of the rinsing liquid, shown in simplified form in FIG. 3, when the spray arm (8) passes through critical corner regions (E) of the rinsing chamber (2) so as to achieve an optimum cleaning effect. The items to be washed arranged in baskets (3, 4, 5) are now hit with increased spray pressure (p), whereby the resulting height of the spray jet is increased and the entire items to be washed are wetted with sufficient rinsing liquid.

Dabei wird in vorteilhafter Weise, wie Figur 3 zeigt, der Sprühdruck (p) von einem Normaldruck (p0) in Eckbereichen (E) so erhöht, dass er sein Maximum (pmax) genau dann erreicht, wenn ein Ende des Sprüharms (8) auf eine Ecke der Spülmaschine (1) zeigt. An dieser Position ist ein erhöhter Sprühdruck (p) wichtig, da hier der Abstand zwischen den Ecksprühdüsen (13) und dem in den Ecken angeordnetem Spülgut maximal ist.In this case, as shown in FIG. 3, the spray pressure (p) is advantageously increased from a normal pressure (p 0 ) in corner regions (E) so that it reaches its maximum (p max ) precisely when one end of the spray arm (8 ) on a corner of the dishwasher (1). At this position, an increased spray pressure (p) is important because here the distance between the Ecksprühdüsen (13) and the arranged in the corners items is maximum.

Das beispielhafte Diagramm des Druckverlaufs (p) gemäß Figur 3 zeigt ein sehr einfaches lineares Druckprofil, welches in den Eckbereichen (E) einen gleichmäßigen An- und Abstieg aufweist. Natürlich führt auch eine Vielzahl anderer Druckverläufe, die ein Maximum in den Eckbereichen (E) aufweisen, zu der verbesserten Reinigungswirkung. So ist beispielsweise auch ein Druckverlauf denkbar, der proportional dem jeweiligen Abstand vom Sprüharmende zur Spülbehälterwand ist.The exemplary diagram of the pressure curve (p) according to FIG. 3 shows a very simple linear pressure profile which has a uniform rise and fall in the corner regions (E). Of course, a variety of other pressure curves, which have a maximum in the corner regions (E), leads to the improved cleaning effect. Such is for example Also, a pressure curve conceivable that is proportional to the distance from the Sprüharmende to the Spülbehälterwand.

Zur Steuerung des Sprühdrucks (p) wird das von der Mikroprozessor-Steuerung (µc) ausgewertete Signal zur Pumpenelektronik (PE) geleitet. Die Pumpenelektronik (PE) reguliert dabei mit an sich bekannten Maßnahmen, wie

  • Spannungsmuster
  • Frequenzsteuerung oder
  • Wicklungsanzapfung mit Feldschwächung
    den Sprühdruck über die Drehzahl der Umwälzpumpe (11). Diese hat beispielsweise ein Grundniveau von ca. 2500U/min, welches in den Eckbereichen (E) bis auf ungefähr 2800U/min erhöht wird.
To control the spray pressure (p), the signal evaluated by the microprocessor control unit (μc) is sent to the pump electronics (PE). The pump electronics (PE) regulates with known measures, such as
  • stress pattern
  • Frequency control or
  • Winding tap with field weakening
    the spray pressure on the speed of the circulation pump (11). This has, for example, a base level of about 2500 rpm, which is increased in the corner areas (E) up to about 2800 rpm.

Abweichend zum oben beschriebenen Verfahren zur Drucksteuerung kann natürlich auch der Sprühdruck durch Modifikationen an den Strömungsgeometrien, wie:

  • Rohrzuleitungen
  • Kanal der Drehachse des Sprüharms
  • Kanal des Sprüharms
  • Querschnittsfläche von mindestens einer Sprühdüse
    reguliert werden, wobei alle in dieser Anmeldung genannten Verfahren zur Drucksteuerung auch kombiniert werden können.
Unlike the method described above for pressure control, of course, the spray pressure can also be modified by modifications to the flow geometries, such as:
  • tube feeders
  • Channel of the rotation axis of the spray arm
  • Channel of the spray arm
  • Cross-sectional area of at least one spray nozzle
    All of the pressure control methods mentioned in this application can also be combined.

Claims (7)

  1. Method of washing articles in a microprocessor-controlled dish-washing machine (1) by means of at least one spraying arm (7, 8, 9), which has spraying nozzles (13) and is rotatably mounted on a spindle in a rectangular washing chamber (2), the spraying arm (7, 8, 9) being supplied with washing fluid from a circulating pump (11) via a pipe (10), characterised in that, each time the rotating spraying arm (7, 8, 9) traverses the corner regions (E) of the washing chamber (2), it is driven at a spraying pressure higher than a normal spraying pressure.
  2. Method according to claim 1, characterised in that a sensor and evaluation means (14) is provided which determines, from the rotational movement of the spraying arm (7, 8, 9), the moment in time at which the spraying arm (7, 8, 9) points into the corner regions (E), and in that, in the corner regions (E), the washing liquid is sprayed into the washing chamber (2) from the spraying nozzles (13) of the rotating spraying arm (7, 8, 9) at an increased pressure.
  3. Method according to at least one of claims 1 or 2, characterised in that, while the washing liquid is being sprayed into the corner regions (E), the pressure is increased by increasing the pump output.
  4. Method according to at least one of claims 1 to 3, characterised in that, while the washing liquid is being sprayed into the corner regions (E), the pressure is increased by changes in the geometric conditions of flow, preferably in the pipe (10).
  5. Method according to at least one of claims 1 to 4, characterised in that the spraying pressure in the corner regions (E) is continuously increased.
  6. Method according to at least one of claims 1 to 4, characterised in that the spraying pressure in the corner regions (E) is suddenly increased.
  7. Method according to at least one of claims 1 to 4, characterised in that the spraying pressure is controlled in proportion to the respective spacing between the spraying arm end and the washing container wall.
EP02008601A 2001-04-27 2002-04-17 Method for washing dishes Expired - Lifetime EP1252856B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10120894 2001-04-27
DE10120894A DE10120894B4 (en) 2001-04-27 2001-04-27 Method for rinsing dishes

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EP1252856A2 EP1252856A2 (en) 2002-10-30
EP1252856A3 EP1252856A3 (en) 2003-01-29
EP1252856B1 true EP1252856B1 (en) 2007-09-05

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AT (1) ATE372082T1 (en)
DE (2) DE10120894B4 (en)
ES (1) ES2289023T3 (en)

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Also Published As

Publication number Publication date
EP1252856A3 (en) 2003-01-29
DE10120894A1 (en) 2002-11-21
ATE372082T1 (en) 2007-09-15
DE50210831D1 (en) 2007-10-18
DE10120894B4 (en) 2007-03-01
EP1252856A2 (en) 2002-10-30
ES2289023T3 (en) 2008-02-01

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