EP1297780A2 - Device with a turbidity sensor for a dishwasher or a washing machine - Google Patents

Device with a turbidity sensor for a dishwasher or a washing machine Download PDF

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Publication number
EP1297780A2
EP1297780A2 EP02020110A EP02020110A EP1297780A2 EP 1297780 A2 EP1297780 A2 EP 1297780A2 EP 02020110 A EP02020110 A EP 02020110A EP 02020110 A EP02020110 A EP 02020110A EP 1297780 A2 EP1297780 A2 EP 1297780A2
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EP
European Patent Office
Prior art keywords
flow
line
bypass line
section
rinsing liquid
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Granted
Application number
EP02020110A
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German (de)
French (fr)
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EP1297780B1 (en
EP1297780A3 (en
Inventor
Andre Bertram
Erik Ekelhoff
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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
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/20—Washing liquid condition, e.g. turbidity

Definitions

  • the object of the invention relates to a device for preventing foam or Air bubbles accumulation in the measuring zone, especially in the rinse water circuit Dishwasher or washing machine arranged turbidity sensor, the Measuring zone with the turbidity sensor in an air bubble separator Line path of the rinsing liquid is arranged.
  • the Applicant has already proposed the circulating rinsing liquid within a measuring zone to transport with calm flow.
  • the measuring zone is in one with the turbidity sensor arranged horizontally running route of the rinsing liquid, which is based on the horizontal level is continuously expanding upwards and a for the liquid flow Calming section forms. Air bubbles can form in the flow-calmed room Collect the level above the measuring zone and be carried away with the flow.
  • the invention has for its object a foam or air bubbles in the To effectively prevent rinsing liquid in the area of the turbidity sensor and the Support the transport of dirt particles directly through the measuring location.
  • the rinsing liquid to be sensed for turbidity on its way to the measuring zone advantageously a separation of foam and / or air bubbles from the liquid in the Area of the measuring zone reached.
  • the transportation of in the Particle residues located in the rinsing liquid towards the measuring point through the light downward sloping bottom part of the bypass line is cheaply supported. In particular, this is for the Further transport of heavier particles, such as B. Sand is an advantage.
  • the optimal separation of foam or air bubbles as well as particle residues in the measuring zone simplifies the Signal evaluation essential for turbidity measurement.
  • FIG. 1 shows a perspective view of a device (1) with a turbidity sensor (2) for the detection of rinse water cloudiness, which is particularly the case with a program-controlled dishwasher can be used.
  • a turbidity sensor (2) for the detection of rinse water cloudiness
  • the dishwashing program run of a dishwasher or turbidity sensors Washing machine can be optimized in a conventional manner. Precondition for an exact It is turbidity value measurement that foam and Air bubbles are separated from the dirt particles in the rinsing water and not from the Turbidity sensor (2) can be detected.
  • the aforementioned device (1) is therefore According to the invention designed as an air or bubble separator.
  • the device (1) has a measuring zone (3) with the turbidity sensor (2) Bypass line (4), which has a horizontally laid main line path (5) for the Rinsing liquid is connected in parallel. Both the bypass line (4) and the The main line path (5) is each designed to have a calm flow.
  • the management of the from Main line path (5) branching bypass line (4) is preferably circular or arched, but could also be laid at angles.
  • the bypass line (4) is with itself flow cross-section (Q) which increases continuously upwards and downwards. Which forcing the flow cross-section (Q) of the bypass to increase continuously upwards and downwards a flow calming in the branched rinsing liquid to be sensed for turbidity.
  • the main line path (5) is designed as a diffuser (6) to calm the flow (see also Fig. 2 and 3), which opens before the in the main route (5) Bypass line ends is arranged.
  • the intended bypass line end is in the flow direction (see arrows, Fig. 1 and 2) Flushing liquid seen behind the line outlet (4b) of the bypass line (4) on the diffuser (6) arranged.
  • the Bypass line (4) and the main line path (5) lie in one level (7).
  • the device (1) is, as shown in Fig.
  • the flow cross section (Q) of the bypass line (4) increases the horizontal plane (7) of the bypass line (4) in the flow direction approximately V or wedge-shaped.
  • the cross-sectional profile in the flow path forms the branched one Flushing liquid a calm zone for the transport of air or foam bubbles (10) on the upper wedge (8) and a zone in the area of the lower wedge (9)
  • Bypass line (4) for separate transport of particle residues (11) in the Rinsing liquid must be carried.
  • the measuring zone (3) with the turbidity sensor (2) is the largest Flow cross-section (Q) of the bypass line (4) near the bottom of the lower wedge slope (9) arranged below the plane (7) of the transported air bubbles (10).
  • the openings (4a, 4b) the bypass line ends are each connected to the diffuser (6) with recesses (12; 13) expanded to reduce vortex flow.
  • the recesses (12; 13) are 1 and 2 advantageously formed staircase, but can also be trapezoidal or be inclined or any other design.
  • the main route (5) widens in the diffuser (6) from a circular entrance cross section (14) into a rectangular one Cross-section and is reduced to a round at the end of the cable Output cross section (15).
  • Fig. 2 shows the flow of the flushing liquid through the main line path (5).
  • the Flow is behind the circular inlet cross-section (14) of the device (1) through the Diffuser (6) expanded to approximately twice the cross-section, the Flow rate cut in half.
  • the operation of the device (1) is as follows understand:
  • the measuring zone (3) works free of any air and Foam bubbles and can therefore optimally sense the turbidity of the liquid, the Particle residues can also be recognized as such.
  • the air (10) carried in the bypass line (4) flows past outside of the turbidity sensor (2) and therefore remains as intended unconsidered.
  • the invention uses the principle of slowing the flow of liquid in the transported rinsing liquid enclosed air and foam bubbles (10) in a to displace the dirt line (11) lying upper line area (8), this through buoyancy.
  • the air bubbles move in a calming distance and have even with full circulation pump output or maximum flushing water flow sufficient time to separate from the particle residues before the turbidity measurement.
  • This is in the device (1), as described, according to the invention by a multiple Reduction in flow velocity achieved.
  • Bypass line (4) Rinsing off any residual dirt that may have accumulated after multiple rinsing program runs
  • Bypass line (4) with a normally closed flushing connection (not shown in more detail) be provided. This connection is then used to rinse out dirt particles for example, connected to the fresh water line or the like.
  • the device (1) described here for a program-controlled dishwasher is equally applicable to a washing machine that can be controlled by a device program.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The test or checking area (3) has a sensor (2) for cloudiness in a bypass or return flow pipe (4) with a calm flow and a continuously increasing cross-section (Q). The test or checking area with the sensor fits near the largest cross-section where the flow rejoins the main pipe. The bypass pipe runs parallel to a main pipe path (5) for a rinsing liquid and acts as a flow recirculation loop.

Description

Der Gegenstand der Erfindung betrifft eine Einrichtung zur Verhinderung einer Schaum- oder Luftblasenansammlung in der Messzone eines insbesondere im Spülwasserkreislauf einer Geschirrspülmaschine oder Waschmaschine angeordneten Trübungssensors, wobei die Messzone mit dem Trübungssensor in einem als Luftblasenabscheider ausgebildeten Leitungsweg der Spülflüssigkeit angeordnet ist.The object of the invention relates to a device for preventing foam or Air bubbles accumulation in the measuring zone, especially in the rinse water circuit Dishwasher or washing machine arranged turbidity sensor, the Measuring zone with the turbidity sensor in an air bubble separator Line path of the rinsing liquid is arranged.

Bei wasserführenden Haushaltgeräten, insbesondere bei programmgesteuerten Geschirrspülmaschinen, welche zur Optimierung des Spülprogrammlaufs Trübungssensoren einsetzen, besteht das Problem, dass sowohl in der Spülflüssigkeit schwimmende Schmutzpartikel als auch durch abgelöste Speisereste verursachte Schaum- und Luftblasen die Messstrecke des Sensors durchwandern, wobei entsprechend den Verunreinigungen und Luftbeimengungen der Spülflüssigkeit verrauschte analoge Mess-Signale von mehr oder weniger hohen Spannungspegeln am Ausgang des Lichtempfängers erzeugt werden. Die verrauschten Mess-Signale kennzeichnen den jeweiligen Grad der Verschmutzung der Spülflüssigkeit, werden aber gravierend durch den mittransportierten Blasen- und/oder Schaumanteil verfälscht. Dies erschwert eine dem tatsächlichen Laugenverschmutzungsgrad entsprechende digitale Signalaufbereitung zur Steuerung des Spülprozesses. Ein vergleichbares Problem tritt bei Waschmaschinen auf, wenn sich in der Waschflotte zunehmend Schaumblasen ansammeln. Zur Lösung dieser Probleme wurde von der Anmelderin bereits vorgeschlagen, die umlaufende Spülflüssigkeit innerhalb einer Messzone strömungsberuhigt zu transportieren. Dabei ist die Messzone mit dem Trübungssensor in einem waagerecht verlaufenden Leitungsweg der Spülflüssigkeit angeordnet, welcher bezogen auf die waagerechte Ebene sich nach oben hin stetig erweitert und für die Flüssigkeitsströmung eine Beruhigungsstrecke bildet. In dem strömungsberuhigten Raum können sich Luftblasen in einer Ebene oberhalb der Messzone ansammeln und mit der Strömung abtransportiert werden. Bei dieser Lösung wurde jedoch als nachteilig erkannt, dass die Verweildauer der Spülflüssigkeit in der Beruhigungsstrecke beim Betrieb der die Spülflüssigkeit fördernden Umwälzpumpe bei vollem Volumenstrom nur sehr kurz ist, so dass Luftblasen und Schaum teilweise dennoch die Messzone durchwandern. Ebenfalls werden Schwebepartikel oder kleine Schmutzpartikel nicht ausreichend separiert. Diese Probleme sollen durch die Erfindung gelöst werden.For water-bearing household appliances, especially for program-controlled ones Dishwashers, which optimize turbidity sensors to optimize the washing program run insert, there is the problem that both floating in the rinsing liquid Dirt particles as well as foam and air bubbles caused by detached food residues Wander the measuring section of the sensor, according to the impurities and Air admixtures of the rinsing liquid noisy analog measurement signals of more or less high voltage levels are generated at the output of the light receiver. The Noisy measurement signals indicate the degree of pollution of the Flushing liquid, but become serious due to the blister and / or transported along Foam content adulterated. This complicates the actual degree of pollution of the alkali Corresponding digital signal processing to control the washing process. On Comparable problem occurs with washing machines when there is in the wash liquor increasingly collect foam bubbles. To solve these problems, the Applicant has already proposed the circulating rinsing liquid within a measuring zone to transport with calm flow. The measuring zone is in one with the turbidity sensor arranged horizontally running route of the rinsing liquid, which is based on the horizontal level is continuously expanding upwards and a for the liquid flow Calming section forms. Air bubbles can form in the flow-calmed room Collect the level above the measuring zone and be carried away with the flow. at However, this solution was recognized as disadvantageous in that the residence time of the rinsing liquid in the calming section during operation of the circulating pump delivering the rinsing liquid full volume flow is only very short, so that air bubbles and foam still partially Wander through the measuring zone. Hover particles or small dirt particles also do not become adequately separated. These problems are to be solved by the invention.

Der Erfindung liegt die Aufgabe zugrunde, eine Schaum- oder Luftblasenansammlung in der Spülflüssigkeit im Bereich der Messzone des Trübungssensors wirksam zu verhindern und den Transport von Schmutzpartikeln direkt durch den Messort zu unterstützen. The invention has for its object a foam or air bubbles in the To effectively prevent rinsing liquid in the area of the turbidity sensor and the Support the transport of dirt particles directly through the measuring location.

Erfindungsgemäß wird diese Aufgabe mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this object is achieved with the features of patent claim 1. Advantageous refinements and developments of the invention result from the following subclaims.

Durch die mit der Erfindung realisierte mehrfache Reduzierung der Strömungsgeschwindigkeit der auf Trübung zu sensierenden Spülflüssigkeit auf ihrem Weg zur Messzone hin wird einerseits vorteilhaft eine Trennung von Schaum und/oder Luftblasen aus der Flüssigkeit im Bereich der Messzone erreicht. Dabei fördert das stetige Ansteigen der Deckenfläche im Bypass den Abtransport der abgesetzten Luftblasen. Andererseits wird der Transport von in der Spülflüssigkeit befindlichen Partikelresten zum Messort hin durch den nach unten leicht abfallenden Bodenteil der Bypassleitung günstig unterstützt. Insbesondere ist dies für den Weitertransport von schwereren Partikel, wie z. B. Sand von Vorteil. Die optimale Separierung von Schaum- oder Luftblasen sowie der Partikelreste in der Messzone vereinfacht die Signalauswertung bei der Trübungsmessung wesentlich.Through the multiple reduction of the flow rate realized with the invention the rinsing liquid to be sensed for turbidity on its way to the measuring zone on the one hand, advantageously a separation of foam and / or air bubbles from the liquid in the Area of the measuring zone reached. The constant increase in the ceiling area in the Bypass the removal of the deposited air bubbles. On the other hand, the transportation of in the Particle residues located in the rinsing liquid towards the measuring point through the light downward sloping bottom part of the bypass line is cheaply supported. In particular, this is for the Further transport of heavier particles, such as B. Sand is an advantage. The optimal separation of foam or air bubbles as well as particle residues in the measuring zone simplifies the Signal evaluation essential for turbidity measurement.

Die Erfindung ist nachstehend anhand von Zeichnungen rein schematisch dargestellt und näher beschrieben. Es zeigt

Figur 1
eine Einrichtung in der Ausbildung als Luftblasenabscheider in perspektivischer Darstellung, mit einem Trübungssensor,
Figur 2
die Einrichtung in schematischer Darstellung in der Draufsicht, im Längsschnitt,
Figur 3
einen Hauptleitungsweg der Einrichtung im Querschnitt, mit einer vom Hauptleitungsweg abzweigenden Bypassleitung,
The invention is shown purely schematically below with reference to drawings and described in more detail. It shows
Figure 1
a device in training as an air bubble separator in perspective, with a turbidity sensor,
Figure 2
the device in a schematic representation in plan view, in longitudinal section,
Figure 3
a main line path of the device in cross section, with a bypass line branching off from the main line path,

Die Fig. 1 zeigt in perspektivischer Darstellung eine Einrichtung (1) mit einem Trübungssensor (2) zur Feststellung von Spülwassertrübungen, der insbesondere bei einer programmgesteuerten Geschirrspülmaschine einsetzbar ist. Mit dem Einsatz von Trübungssensoren kann der Spülprogrammlauf einer Geschirrspülmaschine oder Waschmaschine in an sich bekannter Weise optimiert werden. Vorraussetzung für eine genaue Trübungswertmessung ist es, dass in der Spülflüssigkeit mittransportierte Schaum- und Luftblasen von den Schmutzpartikelresten im Spülwasser separiert und nicht vom Trübungssensor (2) erfasst werden. Die vorgenannte Einrichtung (1) ist deshalb erfindungsgemäß als Luft- oder Blasenabscheider ausgebildet.1 shows a perspective view of a device (1) with a turbidity sensor (2) for the detection of rinse water cloudiness, which is particularly the case with a program-controlled dishwasher can be used. With the use of The dishwashing program run of a dishwasher or turbidity sensors Washing machine can be optimized in a conventional manner. Precondition for an exact It is turbidity value measurement that foam and Air bubbles are separated from the dirt particles in the rinsing water and not from the Turbidity sensor (2) can be detected. The aforementioned device (1) is therefore According to the invention designed as an air or bubble separator.

Die Einrichtung (1) weist eine die Messzone (3) mit dem Trübungssensor (2) enthaltende Bypassleitung (4) auf, welche einem waagerecht verlegten Hauptleitungsweg (5) für die Spülflüssigkeit parallelgeschaltet ist. Sowohl die Bypassleitung (4) als auch der Hauptleitungsweg (5) sind jeweils strömungsberuhigt gestaltet. Die Leitungsführung der vom Hauptleitungsweg (5) abzweigenden Bypassleitung (4) ist vorzugsweise kreis- oder bogenförmig, könnte jedoch auch in Winkeln verlegt sein. Die Bypassleitung (4) ist mit sich stetig nach oben und unten vergrößerndem Strömungsquerschnitt (Q) ausgebildet. Der sich stetig nach oben und unten vergrößernde Strömungsquerschnitt (Q) des Bypasses erzwingt eine Strömungsberuhigung bei der auf Trübung zu sensierenden abgezweigten Spülflüssigkeit.The device (1) has a measuring zone (3) with the turbidity sensor (2) Bypass line (4), which has a horizontally laid main line path (5) for the Rinsing liquid is connected in parallel. Both the bypass line (4) and the The main line path (5) is each designed to have a calm flow. The management of the from Main line path (5) branching bypass line (4) is preferably circular or arched, but could also be laid at angles. The bypass line (4) is with itself flow cross-section (Q) which increases continuously upwards and downwards. Which forcing the flow cross-section (Q) of the bypass to increase continuously upwards and downwards a flow calming in the branched rinsing liquid to be sensed for turbidity.

Hingegen ist der Hauptleitungsweg (5) zur Strömungsberuhigung als Diffusor (6) ausgebildet (sh. auch Fig. 2 und 3), welcher bereits vor den in den Hauptleitungsweg (5) einmündenden Bypass-Leitungsenden angeordnet ist. Das als Leitungseingang (4a) der Bypassleitung (4) vorgesehene Bypass-Leitungsende ist in Strömungsrichtung (sh. Pfeile, Fig. 1 und 2) der Spülflüssigkeit gesehen hinter dem Leitungsausgang (4b) der Bypassleitung (4) am Diffusor (6) angeordnet. Dabei bildet sich eine Strömung in der Bypassleitung (4) aus, welche der beruhigten Spülwasserströmung im Hauptleitungsweg (5) entgegengesetzt gerichtet ist. Die Bypassleitung (4) sowie der Hauptleitungsweg (5) liegen in einer Ebene (7). Die Einrichtung (1) ist, wie in Fig. 1 dargestellt, als adaptierfähige Funktionseinheit oder eigenständiges Bauteil ausgebildet und in Gebrauchslage waagerecht in die Spülwasserleitung zu installieren, wobei als Spülwasserleitung bspw. die Sprüharmzuleitung oder auch der waagerecht verlegte Wasserleitungsweg vor oder hinter der Umwälzpumpe genutzt werden kann.In contrast, the main line path (5) is designed as a diffuser (6) to calm the flow (see also Fig. 2 and 3), which opens before the in the main route (5) Bypass line ends is arranged. As the line inlet (4a) of the bypass line (4) The intended bypass line end is in the flow direction (see arrows, Fig. 1 and 2) Flushing liquid seen behind the line outlet (4b) of the bypass line (4) on the diffuser (6) arranged. A flow forms in the bypass line (4), which is the calmed flushing water flow in the main line path (5) is directed in the opposite direction. The Bypass line (4) and the main line path (5) lie in one level (7). The device (1) is, as shown in Fig. 1, as an adaptable functional unit or an independent component trained and in the use position to install horizontally in the flushing water pipe, whereby as a rinse water line, for example the spray arm supply line or the horizontally installed one Water pipe in front of or behind the circulation pump can be used.

Gemäß Fig. 1 vergrößert sich der Strömungsquerschnitt (Q) der Bypassleitung (4) gegenüber der horizontalen Ebene (7) der Bypassleitung (4) in Strömungsrichtung annähernd V- oder keilförmig. Dabei bildet der Querschnittsverlauf im Strömungsweg der abgezweigten Spülflüssigkeit eine beruhigte Zone für den Transport von Luft- oder Schaumblasen (10) an der oberen Keilschräge (8) und eine Zone im Bereich der unteren Keilschräge (9) der Bypassleitung (4) für einen getrennten Transport von Partikelresten (11), die in der Spülflüssigkeit mitgeführt werden. Die Messzone (3) mit dem Trübungssensor (2) ist im größten Strömungsquerschnitt (Q) der Bypassleitung (4) in Bodennähe der unteren Keilschräge (9) unterhalb der Ebene (7) der transportierten Luftblasen (10) angeordnet. Die Öffnungen (4a, 4b) der Bypass-Leitungsenden sind am Anschluss zum Diffusor (6) jeweils mit Rücksprüngen (12; 13) zur Wirbelreduzierung in Strömungsrichtung erweitert. Die Rücksprünge (12; 13) sind gemäß Fig. 1 und 2 vorteilhaft treppenförmig ausgebildet, können aber auch trapez- bzw. schrägförmig verlaufend oder beliebig anders gestaltet sein. Der Hauptleitungsweg (5) weitet sich im Diffusor (6) von einem kreisförmigen Eingangsquerschnitt (14) in einen rechteckigen Querschnitt auf und reduziert sich am Leitungsende wieder auf einen runden Ausgangsquerschnitt (15).1, the flow cross section (Q) of the bypass line (4) increases the horizontal plane (7) of the bypass line (4) in the flow direction approximately V or wedge-shaped. The cross-sectional profile in the flow path forms the branched one Flushing liquid a calm zone for the transport of air or foam bubbles (10) on the upper wedge (8) and a zone in the area of the lower wedge (9) Bypass line (4) for separate transport of particle residues (11) in the Rinsing liquid must be carried. The measuring zone (3) with the turbidity sensor (2) is the largest Flow cross-section (Q) of the bypass line (4) near the bottom of the lower wedge slope (9) arranged below the plane (7) of the transported air bubbles (10). The openings (4a, 4b) the bypass line ends are each connected to the diffuser (6) with recesses (12; 13) expanded to reduce vortex flow. The recesses (12; 13) are 1 and 2 advantageously formed staircase, but can also be trapezoidal or be inclined or any other design. The main route (5) widens in the diffuser (6) from a circular entrance cross section (14) into a rectangular one Cross-section and is reduced to a round at the end of the cable Output cross section (15).

Die Fig. 2 zeigt den Strömungsverlauf der Spülflüssigkeit durch den Hauptleitungsweg (5). Die Strömung wird hinter dem kreisrunden Eingangsquerschnitt (14) der Einrichtung (1) durch den Diffusor (6) auf etwa den doppelten Querschnitt aufgeweitet, wobei sich die Strömungsgeschwindigkeit in etwa halbiert. Die Arbeitsweise der Einrichtung (1) ist wie folgt zu verstehen:Fig. 2 shows the flow of the flushing liquid through the main line path (5). The Flow is behind the circular inlet cross-section (14) of the device (1) through the Diffuser (6) expanded to approximately twice the cross-section, the Flow rate cut in half. The operation of the device (1) is as follows understand:

Durch die besondere Ausgestaltung der Bypass-Leitungsenden mit den treppenförmigen Rücksprüngen (12; 13) wird eine Wirbelbildung am Leitungseingang (4a) der Bypassleitung (4) stark reduziert und am Leitungsausgang (4b) verhindert, so dass sich eine langsame Rückströmung der abgezweigten Spülflüssigkeit durch den Bypass ausbilden kann. Die größeren zweistufigen Rücksprünge (12) am Leitungsausgang (4b) verhindern die Wirbelbildung im kritischen Bereich der Messzone (3). Der kleinere treppenförmige Rücksprung (13) am Leitungseingang (4a) der Bypassleitung (4) lässt eine geringe Verwirbelung zu, die vorteilhaft als "Antrieb" für die gewünschte langsame Rückströmung der Spülflüssigkeit durch die Bypassleitung (4) ausgenutzt wird.Due to the special design of the bypass line ends with the stepped Recesses (12; 13) will create a vortex at the line inlet (4a) of the bypass line (4) greatly reduced and prevented at the line output (4b), so that there is a slow Backflow of the branched rinsing liquid can form through the bypass. The Larger two-stage recesses (12) at the line outlet (4b) prevent this Vortex formation in the critical area of the measuring zone (3). The smaller step-shaped recess (13) at the line inlet (4a) of the bypass line (4) allows a slight swirl, which advantageous as a "drive" for the desired slow backflow of the rinsing liquid the bypass line (4) is used.

Das stetige Ansteigen der Deckenfläche (obere Keilschräge 8) in der Bypassleitung (4) fördert den Abtransport der sich oben absetzenden Luftblasen (10). Dies ergibt die Möglichkeit, dass sich auch kleine Schaumblasen nach oben hin absetzen können. Umgekehrt verbessert die abfallende Bodenfläche (untere Keilfläche 9) den Weitertransport der Partikelreste (11) insbesondere auch schwere Schmutzpartikel, wie z. B. Sand, die sich unten in der Bypassleitung absetzen bzw. bewegen. Durch die Aufweitung des Bypasses wird die Strömungsgeschwindigkeit vorteilhaft weiter reduziert. Die Fig. 3 verdeutlicht den Unterschied der Strömungsquerschnitte (Q) am Leitungseingang (4a) und Leitungsausgang (4b) der Bypassleitung (4). Am Ende der Bypassleitung (4) kurz vor dem Wiedereintritt in die Hauptströmung des Hauptleitungsweges (5) ist die schon erwähnte Messzone (3) mit dem Trübungssensor (2) vorgesehen. Die Messzone (3) arbeitet frei von jeglichen Luft- und Schaumblasen und kann daher die Trübung der Flüssigkeit optimal sensieren, wobei die Partikelreste auch als solche erkannt werden. Die in der Bypassleitung (4) mitgeführte Luft (10) strömt außen oberhalb des Trübungssensors (2) vorbei und bleibt daher wie gewollt unberücksichtigt.The steady rise of the ceiling surface (upper wedge slope 8) in the bypass line (4) promotes the removal of the air bubbles (10) that settle at the top. This gives the possibility that even small foam bubbles can settle upwards. Conversely, the sloping bottom surface (lower wedge surface 9) the further transport of the particle residues (11) especially heavy dirt particles, such as. B. Sand that is down in the Lower or move the bypass line. By widening the bypass, the Flow rate advantageously further reduced. 3 illustrates the difference the flow cross sections (Q) at the line inlet (4a) and line outlet (4b) Bypass line (4). At the end of the bypass line (4) shortly before re-entering the The main flow of the main line path (5) is the already mentioned measuring zone (3) with the Turbidity sensor (2) provided. The measuring zone (3) works free of any air and Foam bubbles and can therefore optimally sense the turbidity of the liquid, the Particle residues can also be recognized as such. The air (10) carried in the bypass line (4) flows past outside of the turbidity sensor (2) and therefore remains as intended unconsidered.

Die Erfindung nutzt das Prinzip, durch Verlangsamung der Flüssigkeitsströmung die in der transportierten Spülflüssigkeit eingeschlossenen Luft- und Schaumblasen (10) in einen über den Schmutzpartikeln (11) liegenden oberen Leitungsbereich (8) zu verdrängen, wobei dies durch Auftriebswirkung erfolgt. Die Luftblasen bewegen sich in einer Beruhigungsstrecke und haben auch bei voller Umwälzpumpenleistung bzw. maximaler Spülwasserströmung ausreichend Zeit, sich vor der Trübungsmessung von den Partikelresten zu separieren. Dies wird bei der Einrichtung (1), wie beschrieben, erfindungsgemäß durch eine mehrfache Reduzierung der Strömungsgeschwindigkeit erreicht. Um einen sich in der Bypassleitung (4) nach mehrfachen Spülprogrammläufen ggf. abgesetzten Restschmutz auszuspülen, kann die Bypassleitung (4) mit einem Normalbetrieb geschlossenen Spülanschluss (nicht näher gezeigt) versehen werden. Zum Ausspülen von Schmutzpartikeln wird dieser Anschluss dann beispielsweise mit der Frischwasserleitung oder dergl. verbunden.The invention uses the principle of slowing the flow of liquid in the transported rinsing liquid enclosed air and foam bubbles (10) in a to displace the dirt line (11) lying upper line area (8), this through buoyancy. The air bubbles move in a calming distance and have even with full circulation pump output or maximum flushing water flow sufficient time to separate from the particle residues before the turbidity measurement. This is in the device (1), as described, according to the invention by a multiple Reduction in flow velocity achieved. In the bypass line (4) Rinsing off any residual dirt that may have accumulated after multiple rinsing program runs Bypass line (4) with a normally closed flushing connection (not shown in more detail) be provided. This connection is then used to rinse out dirt particles for example, connected to the fresh water line or the like.

Die hier bei einer programmgesteuerten Geschirrspülmaschine beschriebene Einrichtung (1) ist gleichermaßen bei einer per Geräteprogramm steuerbaren Waschmaschine anwendbar.The device (1) described here for a program-controlled dishwasher is equally applicable to a washing machine that can be controlled by a device program.

Claims (15)

Einrichtung (1) zur Verhinderung einer Schaum- oder Luftblasenansammlung in der Messzone (3) eines insbesondere im Spülwasserkreislauf einer Geschirrspülmaschine oder Waschmaschine angeordneten Trübungssensors (2), wobei die Messzone (3) mit dem Trübungssensor (2) in einem als Luftblasenabscheider ausgebildeten Leitungsweg der Spülflüssigkeit angeordnet ist,
dadurch gekennzeichnet, dass die Messzone (3) mit dem Trübungssensor (2) in einer strömungsberuhigten Bypassleitung (4) mit sich stetig nach oben und unten vergrößerndem Strömungsquerschnitt (Q) angeordnet ist, wobei die Messzone (3) mit dem Trübungssensor (2) im Bereich des größten Querschnitts angeordnet ist,
und dass die Bypassleitung (4) einem Hauptleitungsweg (5) für die Spülflüssigkeit parallelgeschaltet ist.Device (1) for preventing foam or air bubble accumulation in the measuring zone (3) of a turbidity sensor (2) arranged in particular in the rinsing water circuit of a dishwasher or washing machine, the measuring zone (3) with the turbidity sensor (2) in a conduit path designed as an air bubble separator Rinsing liquid is arranged,
characterized in that the measuring zone (3) with the turbidity sensor (2) is arranged in a flow-reduced bypass line (4) with a flow cross-section (Q) that increases continuously upwards and downwards, the measuring zone (3) with the turbidity sensor (2) in Area of the largest cross-section is arranged
and that the bypass line (4) is connected in parallel to a main line path (5) for the rinsing liquid. Einrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass der Hauptleitungsweg (5) ebenfalls strömungsberuhigt ausgebildet ist.Device according to claim 1,
characterized in that the main line path (5) is also designed to be flow-calmed. Einrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Strömungsquerschnitt (Q) der Bypassleitung (4) sich gegenüber ihrer horizontalen Ebene (7) in Strömungsrichtung annähernd V- oder keilförmig vergrößert.Device according to claim 1 or 2,
characterized in that the flow cross-section (Q) of the bypass line (4) increases approximately V-shaped or wedge-shaped in relation to its horizontal plane (7) in the flow direction. Einrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass die Bypassleitung (4) in der waagerechten Ebene (7) des strömungsberuhigten Hauptleitungsweges (5) für die Spülflüssigkeit ausgerichtet ist, und dass der Querschnittsverlauf im Strömungsweg der abgezweigten Spülflüssigkeit eine beruhigte Zone mit einem Luft- oder Schaumblasentransport an der oberen Keilschräge (8) und eine Zone im Bereich der unteren Keilschräge (9) für einen getrennten Partikeltransport bildet.Device according to one of claims 1 to 3,
characterized in that the bypass line (4) is aligned in the horizontal plane (7) of the flow-reduced main line path (5) for the rinsing liquid, and in that the cross-sectional profile in the flow path of the branched-off rinsing liquid is a calm zone with air or foam bubble transport on the upper wedge slope (8) and forms a zone in the area of the lower wedge slope (9) for separate particle transport. Einrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Messzone (3) mit dem Trübungssensor (2) in Bodennähe der unteren Keilschräge (9) unterhalb der Ebene (7) der transportierten Luftblasen (10) angeordnet ist. Device according to one of claims 1 to 4,
characterized in that the measuring zone (3) with the turbidity sensor (2) is arranged near the bottom of the lower wedge slope (9) below the plane (7) of the transported air bubbles (10). Einrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass der Hauptleitungsweg (5) für die Spülflüssigkeit vor dem Bereich der abzweigenden Bypassleitung (4) als Diffusor (6) ausgebildet ist.Device according to one of claims 1 to 5,
characterized in that the main line path (5) for the flushing liquid upstream of the branching bypass line (4) is designed as a diffuser (6). Einrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass der Strömungsverlauf der abgezweigten Spülflüssigkeit in der Bypassleitung (4) dem Strömungsverlauf der Spülflüssigkeit im Hauptleitungsweg (5) entgegengerichtet ist.Device according to one of claims 1 to 6,
characterized in that the flow profile of the branched-off rinsing liquid in the bypass line (4) is opposite to the flow profile of the rinsing liquid in the main line path (5). Einrichtung nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass das als Leitungseingang (4a) der Bypassleitung (4) vorgesehene Bypass-Leitungsende in Strömungsrichtung der Spülflüssigkeit gesehen hinter dem Leitungsausgang (4b) der Bypassleitung (4) am Diffusor (6) angeordnet ist.Device according to one of claims 1 to 7,
characterized in that the bypass line end provided as line inlet (4a) of the bypass line (4) is arranged behind the line outlet (4b) of the bypass line (4) on the diffuser (6), viewed in the flow direction of the rinsing liquid. Einrichtung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die Öffnungen der Bypass-Leitungsenden am Anschluss zum Diffusor (6) jeweils mit mindestens einem Rücksprung (12 bzw. 13) zur Wirbelreduzierung versehen sind, welche die Leitungsenden (4a, 4b) im Querschnitt erweitern.Device according to one of claims 1 to 8,
characterized in that the openings of the bypass line ends at the connection to the diffuser (6) are each provided with at least one recess (12 or 13) for swirl reduction, which expand the line ends (4a, 4b) in cross section. Einrichtung nach Anspruch 9,
dadurch gekennzeichnet, dass die Rücksprünge (12; 13) vorzugsweise treppenförmig ausgebildet sind.Device according to claim 9,
characterized in that the recesses (12; 13) are preferably stair-shaped. Einrichtung nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, dass die Leitungsführung der vom Hauptleitungsweg (5) abzweigenden Bypassleitung (4) vorzugsweise kreis- oder bogenförmig ausgebildet ist.Device according to one of claims 1 to 10,
characterized in that the line routing of the bypass line (4) branching off from the main line path (5) is preferably circular or arcuate. Einrichtung nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, dass der Hauptleitungsweg (5) sich von einem runden Eingangsquerschnitt in einen rechteckigen Querschnitt zum Diffusor (6) aufweitet und sich am Ende des Diffusors (6) auf einen runden Ausgangsquerschnitt reduziert. Device according to one of claims 1 to 11,
characterized in that the main line path (5) widens from a round inlet cross section into a rectangular cross section to the diffuser (6) and is reduced to a round outlet cross section at the end of the diffuser (6). Einrichtung nach einem der Ansprüche 1 bis 12,
   dadurch gekennzeichnet, dass dieselbe als adaptierfähige Funktionseinheit oder eigenständiges Bauteil ausgebildet ist.Device according to one of claims 1 to 12,
characterized in that the same is designed as an adaptable functional unit or an independent component. Einrichtung nach Anspruch 13,
   dadurch gekennzeichnet, dass die Funktionseinheit im Leitungsweg einer Spülwasserleitung angeordnet ist.Device according to claim 13,
characterized in that the functional unit is arranged in the line path of a flushing water line. Einrichtung nach einem der Ansprüche 1 bis 14,
   dadurch gekennzeichnet, dass die Bypassleitung (4) mit einem Spülanschluss zur Beseitigung von Restschmutz versehen ist.Device according to one of claims 1 to 14,
characterized in that the bypass line (4) is provided with a flushing connection for removing residual dirt.
EP02020110A 2001-09-21 2002-09-07 Dishwasher or washing machine with a device with a turbidity sensor Expired - Lifetime EP1297780B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10146641A DE10146641C1 (en) 2001-09-21 2001-09-21 Scum or air bubbles collection prevention device for test area on sensor for cloudiness in washing machine, incorporates test area with sensor in access pipe acting as air bubble separator
DE10146641 2001-09-21

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EP1297780A2 true EP1297780A2 (en) 2003-04-02
EP1297780A3 EP1297780A3 (en) 2006-04-12
EP1297780B1 EP1297780B1 (en) 2007-03-07

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AT (1) ATE356350T1 (en)
DE (2) DE10146641C1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10319467B3 (en) 2003-04-29 2004-07-22 Miele & Cie. Kg Device for preventing foam or air bubbles in measuring zone of turbidity sensor for dishwasher or laundry machine with turbulence region incorporated in bypass line across main flow line
EP2708636A1 (en) * 2012-09-14 2014-03-19 Electrolux Home Products Corporation N.V. Appliance with a liquid guiding device
DE102018205502A1 (en) * 2018-04-11 2019-10-17 E.G.O. Elektro-Gerätebau GmbH Sensor device and method for examining a liquid and a washing machine

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US5140168A (en) * 1990-12-03 1992-08-18 Great Lakes Instruments, Inc. Turbidimeter signal processing circuit using alternating light sources
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EP1208790A2 (en) * 2000-11-28 2002-05-29 Miele & Cie. GmbH & Co. Dishwasher provided with a device for impeding the accumulation of air bubbles and foam in the measurement area of a turbidity sensor

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EP1297780B1 (en) 2007-03-07
EP1297780A3 (en) 2006-04-12
ATE356350T1 (en) 2007-03-15
DE10146641C1 (en) 2002-12-12
DE50209638D1 (en) 2007-04-19
ES2280463T3 (en) 2007-09-16

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