EP1252856A2 - Method for washing dishes - Google Patents

Method for washing dishes Download PDF

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Publication number
EP1252856A2
EP1252856A2 EP02008601A EP02008601A EP1252856A2 EP 1252856 A2 EP1252856 A2 EP 1252856A2 EP 02008601 A EP02008601 A EP 02008601A EP 02008601 A EP02008601 A EP 02008601A EP 1252856 A2 EP1252856 A2 EP 1252856A2
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EP
European Patent Office
Prior art keywords
spray
pressure
spray arm
increased
corner
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Granted
Application number
EP02008601A
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German (de)
French (fr)
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EP1252856A3 (en
EP1252856B1 (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 washing dishes in a microprocessor-controlled Dishwasher, with at least one spray arm, which has spray nozzles and is rotatably mounted on an axis in a rectangular washing compartment, the spray arm is fed by a circulation pump via a pipe with rinsing liquid and with a Sensor and evaluation device is coupled.
  • Most domestic dishwashers have a cuboid shape A lower and an upper crockery basket. For that in the baskets To load sorted wash ware with washing liquid, it is common to have at least one on one To arrange the water-bearing axis of the pivoted spray arm in the wash cabinet. On the Spray-shaped spray arms are positioned in such a way that the wash ware is as possible evenly sprayed with rinsing liquid and an optimal cleaning effect is achieved.
  • the rinsing liquid is pumped under pressure through the pipeline water-carrying axis and the channel-shaped spray arm through the spray nozzles into the spray chamber sprayed.
  • the wash ware is arranged in the corner areas often insufficiently cleaned.
  • the local cleaning deficit is due to a insufficient wetting of the dishes in the corner areas of the rectangular wash cabinet. This results from the circular working area of the spray arm, which is not the rectangular one Wash area corresponds.
  • the German patent application DE 198 32 982 A1 improves the cleaning effect in the Corner areas and prevents high water consumption by using a specially trained Spray arm is used. It has two separate hollow channels, each hollow channel at least one spray nozzle and in particular a hollow channel to at least one corner nozzle at the end of the spray arm.
  • the hollow channel to the corner nozzles is designed so that spraying the dishes through the corner nozzle, only in the corner areas of the dishwasher is possible.
  • the solutions presented improve the cleaning effect of the dishes in the corner areas through additional spray arms or modifications to existing spray arms. They are particularly complex and cause high manufacturing and / or manufacturing costs Operation of the dishwasher.
  • the object of the invention is therefore a method for washing dishes in one microprocessor-controlled dishwasher to reveal with which without expensive constructive modifications to the spray system, for example spray nozzle and spray arm, Washware placed in a crockery basket in the corner areas of the washing compartment is also optimal can be cleaned.
  • the object is achieved by a method having the features of the patent claim 1 solved.
  • the method according to the invention can be used alone with the already existing components microprocessor-controlled dishwasher, which has a spray arm detection performed become. It leads to an improved cleaning effect in a cost-effective and simple manner the corners of the dishwasher.
  • a relatively low water consumption proves to be particularly advantageous here an intensive rinsing program in which the pump speed is maintained throughout Program is increased.
  • the spray pressure can be changed very simply by changing the Flow geometry of the waterways to the spray room can be realized.
  • the outlet cross section of the pipeline for example by an electromagnetic valve to reduce the undiminished pump speed briefly whenever the ends of the Place the spray arms on the corner areas of the dishwasher.
  • the dishwasher (1) shown in FIG. 1 has a rectangular washing compartment (2) two crockery baskets (3, 4) arranged one above the other, with above the upper basket (4) a cutlery drawer (5) is arranged.
  • a cutlery drawer (5) is arranged.
  • Under The upper (4) and lower basket (3) can be rotated with a spray arm (7,8) in the square washing container mounted on a water-bearing axis (6a, 6b), a third spray arm (9) on a another axis (6c) rotates above the cutlery drawer (5).
  • the rotatable spray arms (7, 8, 9) are provided with spray nozzles (13) which are arranged in such a way that all the items to be washed in the baskets (3, 4, 5) are from the washing liquid emerging from the nozzles is applied.
  • the spray arms (7 to 9) are driven by a circulation pump (11) supplied with flushing liquid via pipes (10).
  • the circulation pump (11) is Connected via a pipe to the lowest point of the cuboid-shaped wash chamber (2) and sucks in the water collected there via filters known per se and pushes it again through the nozzles (13) of the spray arms (7, 8, 9), with a repulsive force arising from the flushing liquid outlet for rotating the spray arms (7, 8, 9, 9) ) leads.
  • the dishwasher (1) which is shown in a very simplified manner, has the Rotational position of the spray arm (8) a sensor and evaluation device shown in Figure 2 (14).
  • This device (14) consists of at least one actuator and one sensor.
  • the actuator becomes a permanent magnet (PM) at the end of a spray arm (7,8,9), for example at Spray arm (8) placed.
  • a magnetic sensor designed as a sensor is used for spray arm sensing Detector (D) on the machine door (12) arranged in the center.
  • the central arrangement is advantageous because the distance between the circular path on which the magnet (PM) with the Spray arm (8) moves, and the walls of the wash cabinet (2) at this position is minimal, so that the detector (D) receives a clear signal from the magnet (PM).
  • the signal is sent to the microprocessor control ( ⁇ c) of the dishwasher for evaluation directed. This checks the rotation of the spray arm with the signal. Further the microprocessor control ( ⁇ c) monitors the position of the spray arm (8). For this, the Time difference between two signals evaluated. From the time difference and the known Circulation distance of the magnet (PM) is calculated by the microprocessor control ( ⁇ c) Positions where the spray arm ends are in each case with undisturbed spray arm rotation Corner areas (E) of the wash cabinet (2).
  • the position detection can also be carried out with several sensors and / or Actuators are executed.
  • the start of corner areas (E) could be Detectors (D) are marked so that a time measurement between two signals is not necessary is.
  • FIG. 3 shows spray pressure (p) of the rinsing liquid when the spray arm (8) passes through critical corner areas (E) of the wash cabinet (2) in order to achieve an optimal one To achieve cleaning effect. That arranged in baskets (3,4,5) in the corner areas (E) Washware is now hit with increased spray pressure (p), the resulting height of the spray jet is increased and the entire wash ware is wetted with sufficient washing liquid.
  • the spray pressure (p) is advantageously increased from a normal pressure (p 0 ) in corner regions (E) in such a way that it reaches its maximum (p max ) precisely when one end of the spray arm (8 ) points to a corner of the dishwasher (1).
  • An increased spray pressure (p) is important at this position, since here the distance between the corner spray nozzles (13) and the items to be washed arranged in the corners is maximum.
  • the exemplary diagram of the pressure curve (p) according to FIG. 3 shows a very simple one linear pressure profile, which in the corner areas (E) a smooth ascent and descent having.
  • corner areas (E) a smooth ascent and descent having.
  • pressure profiles that maximize pressure Have corner areas (E) to the improved cleaning effect.
  • a pressure curve that is proportional to the respective distance from the spray arm end is also conceivable to the rinsing tank wall.

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 washing dishes in a microprocessor-controlled Dishwasher, with at least one spray arm, which has spray nozzles and is rotatably mounted on an axis in a rectangular washing compartment, the spray arm is fed by a circulation pump via a pipe with rinsing liquid and with a Sensor and evaluation device 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 domestic dishwashers have a cuboid shape A lower and an upper crockery basket. For that in the baskets To load sorted wash ware with washing liquid, it is common to have at least one on one To arrange the water-bearing axis of the pivoted spray arm in the wash cabinet. On the Spray-shaped spray arms are positioned in such a way that the wash ware is as possible evenly sprayed with rinsing liquid and an optimal cleaning effect is achieved. The rinsing liquid is pumped under pressure through the pipeline water-carrying axis and the channel-shaped spray arm through the spray nozzles into the spray chamber sprayed. In this method, the wash ware is arranged in the corner areas often insufficiently cleaned. The local cleaning deficit is due to a insufficient wetting of the dishes in the corner areas of the rectangular wash cabinet. This results from the circular working area of the spray arm, which is not the rectangular one Wash area corresponds.

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.It is known per se from European patent application EP 0 559 466 A1 that the spray area a spray arm through the arrangement of four additional specially trained To extend auxiliary spray arms that also reach the corners of the wash cabinet. The Rinse liquid of the auxiliary spray arms conveyed with an additional pump. Such a solution is expensive because an additional pump and spray arms are required. Furthermore, the partial overlap of the working areas of the spray arms disadvantageously increase 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 the lack Wetting the dishes with washing liquid in the corners of a dishwasher by the To improve the attachment of a single auxiliary spray arm. The auxiliary spray arm mentioned is rotatably supported on one end of the main spray arm. Because of the centrifugal force, caused by the rotation of the main spray arm on the walls of the Along the wash cabinet. With this solution too, the total water consumption is very high because the auxiliary spray arm outside the corners of the wash cabinet, in an angled position on the wall moved and thus a large amount of flushing liquid drained off in areas near the wall is 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 patent application DE 198 32 982 A1 improves the cleaning effect in the Corner areas and prevents high water consumption by using a specially trained Spray arm is used. It has two separate hollow channels, each hollow channel at least one spray nozzle and in particular a hollow channel to at least one corner nozzle at the end of the spray arm. The hollow channel to the corner nozzles is designed so that spraying the dishes through 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 effect of the dishes in the corner areas through additional spray arms or modifications to existing spray arms. They are particularly complex and cause high manufacturing and / or manufacturing costs 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 object of the invention is therefore a method for washing dishes in one microprocessor-controlled dishwasher to reveal with which without expensive constructive modifications to the spray system, for example spray nozzle and spray arm, Washware placed in a crockery basket in the corner areas of the washing compartment is also optimal can be cleaned.

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 the patent claim 1 solved.

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 method according to the invention can be used alone with the already existing components microprocessor-controlled dishwasher, which has a spray arm detection performed become. It leads to an improved cleaning effect in a cost-effective and simple manner the corners of the dishwasher.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.Advantageous developments of the invention result 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. Options for controlling the pressure of the spray jet are listed here. A possibility the pressure over the pump power, which is related to the physical To control the pump speed is particularly advantageous when the dishwasher with modern pump electronics; as known from the patent DE 195 13 352 A1 is equipped.

Besonders vorteilhaft erweist sich hierbei ein relativ geringer Wasserverbrauch gegenüber einem Intensivspülprogramm, bei dem die Pumpendrehzahl während des gesamten Programms erhöht ist.A relatively low water consumption proves to be particularly advantageous here an intensive rinsing program in which the pump speed is maintained throughout Program is increased.

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 a further possibility, the spray pressure can be changed very simply by changing the Flow geometry of the waterways to the spray room can be realized. Here it offers itself at, the outlet cross section of the pipeline, for example by an electromagnetic valve to reduce the undiminished pump speed briefly whenever the ends of the Place the spray arms on the corner areas of the dishwasher. The examples described above for pressure control make clear that the cleaning effect is achieved by simple means alone improved by the inventive method in the corner areas of the wash cabinet becomes.

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 is described in more detail below. It shows
Figure 1
a program-controlled dishwasher with a washing container and spray arms in a simplified schematic representation,
Figure 2
the washing container in cross-section with a spray arm in plan view and a control for the spray pressure in the washing room
Figure 3
a diagram of a pressure curve of the washing 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 dishwasher (1) shown in FIG. 1 has a rectangular washing compartment (2) two crockery baskets (3, 4) arranged one above the other, with above the upper basket (4) a cutlery drawer (5) is arranged. Alternatively, it is also known to replace the Cutlery drawer (5) to integrate a cutlery basket in one of the crockery baskets (3,4). Under The upper (4) and lower basket (3) can be rotated with a spray arm (7,8) in the square washing container mounted on a water-bearing axis (6a, 6b), a third spray arm (9) on a another axis (6c) rotates above the cutlery drawer (5).

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 the items to be washed in the baskets (3, 4, 5) are from the washing liquid emerging from the nozzles is applied. The spray arms (7 to 9) are driven by a circulation pump (11) supplied with flushing liquid via pipes (10). The circulation pump (11) is Connected via a pipe to the lowest point of the cuboid-shaped wash chamber (2) and sucks in the water collected there via filters known per se and pushes it again through the nozzles (13) of the spray arms (7, 8, 9), with a repulsive force arising from the flushing liquid outlet for rotating the spray arms (7, 8, 9, 9) ) leads. The dishwasher (1), which is shown in a very simplified manner, has the Rotational position of the spray arm (8) a sensor and evaluation device shown in Figure 2 (14). This device (14) consists of at least one actuator and one sensor. As The actuator becomes a permanent magnet (PM) at the end of a spray arm (7,8,9), for example at Spray arm (8) placed. A magnetic sensor designed as a sensor is used for spray arm sensing Detector (D) on the machine door (12) arranged in the center. The central arrangement is advantageous because the distance between the circular path on which the magnet (PM) with the Spray arm (8) moves, and the walls of the wash cabinet (2) at this position is minimal, 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 control (µc) of the dishwasher for evaluation directed. This checks the rotation of the spray arm with the signal. Further the microprocessor control (µc) monitors the position of the spray arm (8). For this, the Time difference between two signals evaluated. From the time difference and the known Circulation distance of the magnet (PM) is calculated by the microprocessor control (µc) Positions where the spray arm ends are in each case with undisturbed spray arm rotation Corner areas (E) of the wash cabinet (2).

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 carried out with several sensors and / or Actuators are executed. For example, the start of corner areas (E) could be Detectors (D) are marked so that a time measurement between two signals is not necessary is.

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 for this, which is simplified in FIG. 3 shown spray pressure (p) of the rinsing liquid when the spray arm (8) passes through critical corner areas (E) of the wash cabinet (2) in order to achieve an optimal one To achieve cleaning effect. That arranged in baskets (3,4,5) in the corner areas (E) Washware is now hit with increased spray pressure (p), the resulting height of the spray jet is increased and the entire wash ware is wetted with sufficient washing 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.3, the spray pressure (p) is advantageously increased from a normal pressure (p 0 ) in corner regions (E) in such a way that it reaches its maximum (p max ) precisely when one end of the spray arm (8 ) points to a corner of the dishwasher (1). An increased spray pressure (p) is important at this position, since here the distance between the corner spray nozzles (13) and the items to be washed arranged in the corners 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 one linear pressure profile, which in the corner areas (E) a smooth ascent and descent having. Of course, there are also a variety of other pressure profiles that maximize pressure Have corner areas (E) to the improved cleaning effect. For example a pressure curve that is proportional to the respective distance from the spray arm end is also conceivable to the rinsing tank wall.

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 (µc) is sent to the pump electronics (PE). The pump electronics (PE) regulate with measures known per se, such as
  • stress pattern
  • Frequency control or
  • Winding tap with field weakening
    the spray pressure via the speed of the circulation pump (11). This has, for example, a basic level of approximately 2500 rpm, which is increased in the corner areas (E) to approximately 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.
In a departure from the pressure control method described above, the spray pressure can of course also be modified by modifying the flow geometries, such as:
  • tube feeders
  • Channel of the axis of rotation of the spray arm
  • Spray arm channel
  • Cross-sectional area of at least one spray nozzle
    are regulated, whereby all of the methods for pressure control mentioned in this application can also be combined.

Claims (7)

Verfahren zum Spülen von Spülgut in einer mikroprozessorgesteuerten Geschirrspülmaschine (1), mit mindestens einem Sprüharm (7,8,9), der Sprühdüsen (13) aufweist und in einem rechteckigen Spülraum (2) drehbar auf einer Achse gelagert ist, wobei der Sprüharm (7,8,9) von einer Umwälzpumpe (11) über eine Rohrleitung (10) mit Spülflüssigkeit gespeist wird,
dadurch gekennzeichnet, dass der rotierende Sprüharm (7,8,9) jeweils beim Durchlaufen der Eckbereiche (E) des Spülraumes (2) mit erhöhtem Sprühdruck gegenüber einem Normalsprühdruck betrieben wird.Method for washing dishes in a microprocessor-controlled dishwasher (1), with at least one spray arm (7, 8, 9), which has spray nozzles (13) and is rotatably mounted on an axis in a rectangular wash chamber (2), the spray arm ( 7,8,9) from a circulating pump (11) is fed with rinsing liquid via a pipeline (10),
characterized in that the rotating spray arm (7, 8, 9) is operated with increased spray pressure compared to a normal spray pressure when passing through the corner regions (E) of the wash cabinet (2). Verfahren nach Anspruch1,
dadurch gekennzeichnet, dass eine Sensor- und Auswerteeinrichtung (14) vorgesehen ist, die aus der Rotationsbewegung des Sprüharmes (7,8,9) den Zeitpunkt ermittelt, wann der Sprüharm (7,8,9) in die Eckbereiche (E) zeigt und dass in den Eckbereichen (E) die Spülflüssigkeit aus den Sprühdüsen (13) des rotierenden Sprüharms (7,8,9) mit erhöhtem Druck in den Spülraum (2) eingesprüht wird.Method according to claim 1,
characterized in that a sensor and evaluation device (14) is provided which determines from the rotational movement of the spray arm (7, 8, 9) the point in time when the spray arm (7, 8, 9) points into the corner areas (E) and that in the corner areas (E) the washing liquid from the spray nozzles (13) of the rotating spray arm (7, 8, 9) is sprayed into the washing area (2) with increased pressure. Verfahren nach mindestens einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, dass der Druck beim Einsprühen der Spülflüssigkeit in den Eckbereichen (E) durch Erhöhung der Pumpenleistung vergrößert wird.Method according to at least one of claims 1 or 2,
characterized in that the pressure when the rinsing liquid is sprayed in the corner regions (E) is increased by increasing the pump output. Verfahren nach mindestens einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Druck beim Einsprühen der Spülflüssigkeit in den Eckbereichen (E) durch Veränderungen der Strömungsgeometrien, vorzugsweise in der Rohrleitung (10), vergrößert wird.Method according to at least one of claims 1 to 3,
characterized in that the pressure when the rinsing liquid is sprayed in the corner regions (E) is increased by changes in the flow geometries, preferably in the pipeline (10). Verfahren nach mindestens einem der Ansprüche 1 bis 4
dadurch gekennzeichnet, dass der Sprühdruck in den Eckbereichen (E) kontinuierlich erhöht wird.Method according to at least one of claims 1 to 4
characterized in that the spray pressure in the corner areas (E) is continuously increased. Verfahren nach mindestens einem der Ansprüche 1 bis 4
dadurch gekennzeichnet, dass der Sprühdruck in den Eckbereichen (E) sprunghaft erhöht wird. Method according to at least one of claims 1 to 4
characterized in that the spray pressure in the corner areas (E) is increased suddenly. Verfahren nach mindestens einem der Ansprüche 1 bis 4
dadurch gekennzeichnet, dass der Sprühdruck proportional zu dem jeweiligen Abstand vom Sprüharmende zur Spülbehälterwand gesteuert wird.Method according to at least one of claims 1 to 4
characterized in that the spray pressure is controlled in proportion to the respective distance from the spray arm end to the washing compartment 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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EP1252856A3 EP1252856A3 (en) 2003-01-29
EP1252856B1 EP1252856B1 (en) 2007-09-05

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DE10120894B4 (en) 2007-03-01
EP1252856A3 (en) 2003-01-29
DE50210831D1 (en) 2007-10-18
ATE372082T1 (en) 2007-09-15
EP1252856B1 (en) 2007-09-05
ES2289023T3 (en) 2008-02-01
DE10120894A1 (en) 2002-11-21

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