EP1997420B1 - Commercial dishwasher - Google Patents

Commercial dishwasher Download PDF

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Publication number
EP1997420B1
EP1997420B1 EP08156113A EP08156113A EP1997420B1 EP 1997420 B1 EP1997420 B1 EP 1997420B1 EP 08156113 A EP08156113 A EP 08156113A EP 08156113 A EP08156113 A EP 08156113A EP 1997420 B1 EP1997420 B1 EP 1997420B1
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EP
European Patent Office
Prior art keywords
liquid
dishwasher according
pump
dishwasher
pumps
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EP08156113A
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German (de)
French (fr)
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EP1997420A2 (en
EP1997420A3 (en
Inventor
Udo Bürkle
Martin Schrempp
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Premark FEG LLC
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Premark FEG LLC
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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
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
    • 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
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • A47L15/0078—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals with a plurality of fluid recirculation arrangements, e.g. with separated washing liquid and rinsing liquid recirculation circuits
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • 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
    • A47L2401/04—Crockery or tableware details, e.g. material, quantity, condition
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/10—Water cloudiness or dirtiness, e.g. turbidity, foaming or level of bacteria
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • 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 commercial dishwasher according to the preamble of claim 1.
  • washing zone 140 A1 is a commercial dishwasher in the form of a conveyor dishwasher known, which has two washing zones and in Spülgut-transport direction after the washing zones at least one rinse zone.
  • the washing zones each contain a washing system with washing nozzles, wherein a washing tank for collecting the washing liquid sprayed in the washing zone in question is provided for each washing zone.
  • the washing liquid sprayed from the washing nozzles present therefrom is recirculated back from the associated washing tank by means of a pump through a washing liquid feed line back to the washing nozzles.
  • the program automates have a single treatment chamber for receiving and treating items to be washed.
  • a dish rack is provided in which the items to be washed can be loaded.
  • the treatment chamber can be closed by a door.
  • the conveyor dishwashers have at least one washing zone and at least one final rinse zone.
  • Hood machines have a treatment zone under a hood arranged to be moved up and down.
  • a programmer is for example from the DE 10 2005 023 429 A1 known.
  • Transport dishwashers are for example from the WO 2006/007236 A2 .
  • WO 2005/070276 EP 1 637 059 A2 and DE 10 2005 035 764 A1 known.
  • Dishware is especially dishes, glasses, cutlery, cooking utensils, baking utensils and serving trays.
  • a pole-changing electric centrifugal pump is used to promote the washing liquid, which can be switched from a two-pole operation to a four-pole operation, then by such a pole change a speed reduction of the pump motor of 3000 revolutions / min. to 1500 revolutions / min. be achieved.
  • This reduction in the speed causes a change in the water pressure at the pump outlet (pump discharge side).
  • the water pressure is not halved, but it changes from about 1.0 bar at 3000 U / min. to about 0.25 bar at 1500 rpm. Due to this non-proportional change of the washing liquid pressure for glasses and dishes is often too low. More advantageous would be a washing liquid pressure of about 0.5 bar.
  • the liquid pressure acting on the items to be washed depends on the conduit system installed in the dishwasher, for example a washing system and / or a rinse aid system.
  • the problem to be solved is to provide a way by which in a simple manner, alternatively, two different liquid pressures can be generated, each fluid pressure is matched to the different items to be cleaned.
  • the invention generally relates to a commercial dishwasher in which at least two centrifugal pumps connected in series are arranged upstream of at least one washing system and / or a final-rinse system.
  • both pumps have identical pump characteristics.
  • the two pumps have different pump characteristics.
  • an operation is possible only with the upstream of the two pumps in series or with both pumps.
  • operation is possible only with the downstream of the two pumps in series or with both pumps.
  • a soft start and thus a gentle increase in pressure is achieved in that at the start of a wash cycle or a rinse cycle initially only one of the two pumps is turned on and after a predetermined time delay or after a by other criteria specific time delay, the other pump is additionally turned on.
  • two standard pumps can be hydraulically connected in series in series.
  • the invention uses the knowledge that the pressures of two pumps arranged hydraulically one behind the other add up. With two hydraulic centrifugal pumps arranged one behind the other, the pressure is approximately doubled. The volume flow is thereby changed only insignificantly.
  • the head h is given in meters (m).
  • the volume flow Q is given in m 3 / h.
  • P1 denotes the pump characteristic of a pump 1;
  • P2 denotes the pump characteristic of a further pump 2 connected in series with the pump 1;
  • P1 + P2 designates the pump characteristic of the series connection of both pumps 1 and 2.
  • the pump characteristics cross the system characteristic "A", which depends on the respective pipe system of the dishwasher.
  • B1 denotes an operating point of a pump 1;
  • B2 denotes an operating point of the other pump 2; and
  • B3 denotes an operating point of the series connection of the two pumps 1 and 2.
  • the characteristic diagram of Fig. 1 shows from the registered heights h1, h2 and h3, that the increase between each of the individual pump characteristics P1 and P2 and the common characteristic P1 + P2 of the series connection of both pumps 1 and 2 the stronger, the steeper the system characteristic "A" between the Operating points B1, B2 and B3.
  • the volume flow Q On the horizontal axis of the characteristic diagram, it can be seen, for the volume flow Q, that the increase in the volume flow Q1 of one pump or of the volume flow Q2 of the other pump to the volume flow Q3 of the series connection of the two pumps is relatively small.
  • the invention offers the possibility to operate for the low pressure operation only the pump 1 with the pressure P1 and for the high pressure operation, the pump 1 with the pressure P1 and the pump 2 with the pressure P2 at short intervals one behind the other (or simultaneously) to start and then to operate both together.
  • two pumps may be used, one of which has a different power than the other pump or a different pump characteristic than the other pump.
  • the fluid pressure depending on the design of the line system may be higher or lower than when operating alone with the pump. 1
  • the invention advantageously also offers the possibility of achieving three different liquid pressures of washing liquid or final rinse liquid by the combination of only two pumps 1 and 2.
  • Fig. 2 schematically shows a commercial dishwasher in the form of a programmer according to the invention. It contains two in series successively arranged pumps 1 and 2, hereinafter referred to as washing pumps, in a washing liquid flow line 4, which connects the lower end of a wash tank 6 with at least one lower wash arm 8 and an upper wash arm 10 hydraulically.
  • the washing arms 8 and 10 are located in a treatment chamber 12 below or above the Spülgutability Suites and are each provided with spray nozzles 8-2 and 10-2, which are directed against the dishes.
  • a cleaner metering pump 13 For supplying cleaner in the wash tank, a cleaner metering pump 13 may be provided.
  • a pressure switch 14 may be provided.
  • a heater 16 For heating the washing liquid in the washing tank 6, a heater 16 may be provided.
  • a drain line 20 may be connected to a drain pump 22.
  • washing pumps 1 and 2 of Fig. 2 are switched on by a control device 24 by at least one user program individually or in combination according to at least one of the variants described above with reference to the Fig. 1 have been described or defined in the claims.
  • a fresh water supply line 26 is connectable at its upstream start via a solenoid valve 28 with a fresh water supply hose 30.
  • the downstream end of the fresh water supply line 26 is connected to a water inlet device 32, via which fresh water can flow into a water heater 34.
  • a rinse aid supply line for example a rinse aid dosing pump 36 for the supply of rinse aid, is connected to the water heater 34 in the water of the water heater 34.
  • the final rinse liquid of the water heater 34 is passed through a rinse aid 40 to a lower rinse arm 44 and at least one upper rinse arm 46, and through spray nozzles 44-2 and 46-2 respectively formed therein into the processing chamber 12 (FIG. not shown) ware sprayed.
  • the water heater 34 may be provided with an emptying device 48.
  • two rinse pumps can be arranged in series with one another and alternatively switched on according to at least two different variants, as described with reference to FIGS FIGS. 1 and 2 for the washing pumps 1 and 2 have been described.
  • Fig. 3 shows a transport dishwasher according to the invention, which, for example, in the following order, in which items 250 transported by a transport device 252 in the transport direction 254, a prewash zone 262, a first wash zone 264, a second wash zone 266 and a final rinse zone 268 contains.
  • a tank 263 or 265 or 267 or 269 for receiving the liquid sprayed in the respective zone.
  • the tanks 269, 267, 265 and 263 form a cascade circuit in which liquid in a liquid direction 270 overflows into the respectively adjacent tank, wherein the liquid flow direction 270 is opposite from tank to tank to the transport direction 254.
  • rinse liquid can be fed to spray nozzles 274 and 276, which are arranged in the final rinse zone 268 above and below the transport device 252.
  • washing liquid pipe system 278 washing liquid from the second washing tank 267 to spray nozzles 280 and 282 is conveyed, which in the second washing zone 266 below and above the transport device 252 are arranged.
  • the two series-arranged washing pumps 201 and 202 are switched on in the same way individually or together, as described above with reference to the FIGS. 1 and 2 with respect to pumps 1 and 2 has been described.
  • wash liquid line system 284 is a series arrangement of two wash pumps 301 and 302 for pumping wash liquid from the wash tank 265 to lower and upper spray nozzles 286 and 288 in the second wash zone 264.
  • the two series (sequential) pumps 301 and 302 are individually or jointly switched on, as described above with respect to the pumps 1 and 2 of FIGS. 1 and 2 has been described.
  • lower spray nozzles 290 and upper spray nozzles 292 for spraying prewash liquid 294 are located on the washware 250 to be cleaned.
  • the transport dishwasher of Fig. 3 is controlled by a controller 320 which includes at least one application program therefor.
  • Fig. 4 shows a further embodiment of a transport dishwasher according to the invention, in which Fig. 3 Matching parts are provided with the same reference numerals and which of Fig. 3 characterized *** in that the final rinse liquid supply means 272 directs the final rinse liquid into the final rinse liquid tank 269.
  • the rinse liquid is conveyed from the tank 269 by the series connection of two pumps 401 and 402 to the lower and upper spray nozzles 274 and 276, respectively, of the final rinse zone 268.
  • the final rinse liquid can be delivered with at least two different pressures, as described above with respect to the pumps 1 and 2 of FIG FIGS. 1 and 2 has been described.
  • the variants are preferably switched on automatically by at least one application program (cleaning program) of the control device. Furthermore, embodiments of the invention are possible in which the switching on of the variants is only possible manually or alternatively is possible automatically or manually.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Description

Die Erfindung betrifft eine gewerbliche Geschirrspülmaschine gemäß dem Oberbegriff von Anspruch 1.The invention relates to a commercial dishwasher according to the preamble of claim 1.

Aus der Druckschrift DE 10 2005 039 140 A1 ist eine gewerbliche Geschirrspülmaschine in Gestalt einer Transportspülmaschine bekannt, welche zwei Waschzonen und in Spülgut-Transportrichtung nach den Waschzonen mindestens eine Klarspülzone aufweist. Die Waschzonen enthalten jeweils ein Waschsystem mit Waschdüsen, wobei für jede Waschzone ein Waschtank zum Auffangen der in der betreffenden Waschzone versprühten Waschflüssigkeit vorgesehen ist. In jeder Waschzone wird die von den dort vorhandenen Waschdüsen versprühte Waschflüssigkeit aus dem zugehörigen Waschtank mittels einer Pumpe durch eine Waschflüssigkeitszufuhrleitung wieder zu den Waschdüsen zurück rezirkuliert.From the publication DE 10 2005 039 140 A1 is a commercial dishwasher in the form of a conveyor dishwasher known, which has two washing zones and in Spülgut-transport direction after the washing zones at least one rinse zone. The washing zones each contain a washing system with washing nozzles, wherein a washing tank for collecting the washing liquid sprayed in the washing zone in question is provided for each washing zone. In each washing zone, the washing liquid sprayed from the washing nozzles present therefrom is recirculated back from the associated washing tank by means of a pump through a washing liquid feed line back to the washing nozzles.

Gewerbliche Geschirrspülmaschinen, für welche die Erfindung verwendet werden kann, sind Programmautomaten (batch dishwasher oder batch warewashers oder auch box machines genannt), Transportspülmaschinen (conveyor warewashers) in Form beispielsweise von Bandtransportspülmaschinen (flight-type warewashers) oder in Form von Korbtransportspülmaschinen (rack conveyor warewashers) und Haubenmaschinen (hood-type warewashers). Die Programmautomaten haben eine einzige Behandlungskammer zur Aufnahme und zur Behandlung von Spülgut. Vorzugsweise ist ein Geschirrkorb vorgesehen, in welchen das Spülgut geladen werden kann. Die Behandlungskammer ist durch eine Tür verschließbar. Die Transportspülmaschinen haben mindestens eine Waschzone und mindestens eine Klarspülzone. Haubenmaschinen haben eine Behandlungszone unter einer auf- und abbewegbar angeordneten Haube.Commercial dishwashers for which the invention can be used are program converters (batch dishwasher or batch warewashers or box machines), conveyor warewashers in the form of, for example, flight-type warewashers or in the form of rack conveyor dishwashers (rack conveyor warewashers) and hood machines (hood-type warewashers). The program automates have a single treatment chamber for receiving and treating items to be washed. Preferably, a dish rack is provided in which the items to be washed can be loaded. The treatment chamber can be closed by a door. The conveyor dishwashers have at least one washing zone and at least one final rinse zone. Hood machines have a treatment zone under a hood arranged to be moved up and down.

Ein Programmautomat ist beispielsweise aus der DE 10 2005 023 429 A1 bekannt. Transportspülmaschinen sind beispielsweise aus der WO 2006/007236 A2 , WO 2005/070276 , EP 1 637 059 A2 und DE 10 2005 035 764 A1 bekannt.A programmer is for example from the DE 10 2005 023 429 A1 known. Transport dishwashers are for example from the WO 2006/007236 A2 . WO 2005/070276 . EP 1 637 059 A2 and DE 10 2005 035 764 A1 known.

Spülgut ist insbesondere Geschirr, Gläser, Besteck, Kochutensilien, Backutensilien und Servier-Tabletts.Dishware is especially dishes, glasses, cutlery, cooking utensils, baking utensils and serving trays.

Beim Reinigen von Spülgut in gewerblichen Geschirrspülmaschinen, insbesondere in Programmautomaten, ist es häufig notwendig, Reinigungsprogramme mit verschiedenen, dem Spülgut angepassten Flüssigkeitsdrücken für die Waschflüssigkeit und/oder für die Klarspülflüssigkeit zu haben.When cleaning items to be washed in commercial dishwashers, especially in program machines, it is often necessary to have cleaning programs with different liquid pressures for the washing liquid and / or for the final rinse liquid adapted to the items to be washed.

Wenn zur Förderung der Waschflüssigkeit eine polumschaltbare elektrische Kreiselpumpe verwendet wird, welche von einem zweipoligen Betrieb auf einen vierpoligen Betrieb umschaltbar ist, dann kann durch eine solche Polumschaltung eine Drehzahlreduzierung des Pumpenmotors von 3000 Umdrehungen/min. auf 1500 Umdrehungen/min. erreicht werden. Diese Reduzierung der Drehzahl bewirkt eine Änderung des Wasserdrucks am Pumpenausgang (Druckseite der Pumpe). Durch diese Halbierung der Drehzahl des Pumpenmotors und damit auch der Drehzahl der Pumpe wird jedoch der Wasserdruck nicht halbiert, sondern er verändert sich von ca. 1,0 bar bei 3000 U/min. auf ca. 0,25 bar bei 1500 U/min. Durch diese nichtproportionale Veränderung ist der Waschflüssigkeitsdruck für Gläser und Geschirr häufig zu gering. Vorteilhafter wäre ein Waschflüssigkeitsdruck von ca. 0,5 bar. Der auf das Spülgut wirkende Flüssigkeitsdruck ist abhängig von dem in die Geschirrspülmaschine eingebauten Leitungssystem, beispielsweise Waschsystem und/oder Klarspülsystem.If a pole-changing electric centrifugal pump is used to promote the washing liquid, which can be switched from a two-pole operation to a four-pole operation, then by such a pole change a speed reduction of the pump motor of 3000 revolutions / min. to 1500 revolutions / min. be achieved. This reduction in the speed causes a change in the water pressure at the pump outlet (pump discharge side). By halving the speed of the pump motor and thus the speed of the pump, however, the water pressure is not halved, but it changes from about 1.0 bar at 3000 U / min. to about 0.25 bar at 1500 rpm. Due to this non-proportional change of the washing liquid pressure for glasses and dishes is often too low. More advantageous would be a washing liquid pressure of about 0.5 bar. The liquid pressure acting on the items to be washed depends on the conduit system installed in the dishwasher, for example a washing system and / or a rinse aid system.

Durch die Erfindung soll die Aufgabe gelöst werden, eine Möglichkeit zu schaffen, durch welche auf einfache Weise alternativ jeweils zwei verschiedene Flüssigkeitsdrücke erzeugbar sind, wobei jeder Flüssigkeitsdruck auf das zu reinigende, unterschiedliche Spülgut abgestimmt ist.By the invention, the problem to be solved is to provide a way by which in a simple manner, alternatively, two different liquid pressures can be generated, each fluid pressure is matched to the different items to be cleaned.

Diese Aufgabe wird gemäß der Erfindung durch die Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are contained in the subclaims.

Generell betrifft die Erfindung eine gewerbliche Geschirrspülmaschine, bei welcher stromaufwärts von mindestens einem Waschsystem, und/oder einem Klarspülsystem, mindestens zwei in Reihe geschaltete Kreiselpumpen angeordnet sind.The invention generally relates to a commercial dishwasher in which at least two centrifugal pumps connected in series are arranged upstream of at least one washing system and / or a final-rinse system.

Gemäß einem besonderen Merkmal besitzen beide Pumpen identische Pumpenkennlinien.According to a special feature, both pumps have identical pump characteristics.

Gemäß einer anderen Ausführungsform der Erfindung haben die beiden Pumpen unterschiedliche Pumpenkennlinien.According to another embodiment of the invention, the two pumps have different pump characteristics.

Gemäß einer vorteilhaften Ausführungsform der Erfindung ist alternativ ein Betrieb nur mit der stromaufwärtigen der beiden in Reihe angeordneten Pumpen oder mit beiden Pumpen möglich.According to an advantageous embodiment of the invention, an operation is possible only with the upstream of the two pumps in series or with both pumps.

Gemäß einer anderen vorteilhaften Ausführungsform ist alternativ ein Betrieb nur mit der stromabwärtigen der beiden in Reihe angeordneten Pumpen oder mit beiden Pumpen möglich.Alternatively, according to another advantageous embodiment, operation is possible only with the downstream of the two pumps in series or with both pumps.

Gemäß einer ebenfalls vorteilhaften Ausführungsform der Erfindung, insbesondere wenn eine der beiden Pumpen eine andere Förderleistung als die andere Pumpe hat, ist alternativ ein Betrieb nur der einen Pumpe oder nur der anderen Pumpe oder beider Pumpen gleichzeitig vorgesehen.According to a likewise advantageous embodiment of the invention, in particular when one of the two pumps has a different delivery rate than the other pump, an operation of only one pump or only the other pump or both pumps is alternatively provided simultaneously.

Gemäß einer besonderen Ausführungsform der Erfindung wird ein sanfter Anlauf und damit auch ein sanfter Druckanstieg dadurch erreicht, dass beim Start eines Waschzyklus oder eines Klarspülzyklus zunächst nur eine der beiden Pumpen eingeschaltet wird und nach einer vorbestimmten Zeitverzögerung oder nach einer durch andere Kriterien bestimmten zeitlichen Verzögerung die andere Pumpe zusätzlich mit eingeschaltet wird.According to a particular embodiment of the invention, a soft start and thus a gentle increase in pressure is achieved in that at the start of a wash cycle or a rinse cycle initially only one of the two pumps is turned on and after a predetermined time delay or after a by other criteria specific time delay, the other pump is additionally turned on.

Die Erfindung wird im Folgenden mit Bezug auf die beiliegenden Zeichnungen anhand von bevorzugten Ausführungsformen als Beispiele beschrieben. In den Zeichnungen zeigen

Fig. 1
ein Diagramm mit Pumpenkennlinien bei einer Reihenschaltung von zwei Pumpen gemäß der Erfindung,
Fig. 2
schematisch einen Programmautomaten gemäß der Erfindung,
Fig. 3
schematisch eine Transportgeschirrspülmaschine gemäß der Erfindung,
Fig. 4
schematisch eine weitere Transportgeschirrspülmaschine gemäß der Erfindung.
The invention will now be described by way of example with reference to the accompanying drawings, given by way of preferred embodiments. In the drawings show
Fig. 1
a diagram with pump characteristics in a series connection of two pumps according to the invention,
Fig. 2
schematically a program machine according to the invention,
Fig. 3
schematically a transport dishwasher according to the invention,
Fig. 4
schematically another transport dishwasher according to the invention.

Eine Pumpe mit einer Leistung von beispielsweise 1,1 kW erreicht in einem Waschsystem oder Klarspülsystem, wie es bei Programmautomaten oder bei einer Transportspülmaschine verwendet werden kann, einen Flüssigkeitsdruck von beispielsweise 0,5 bar.A pump with a power of 1.1 kW, for example, achieves a fluid pressure of, for example, 0.5 bar in a washing system or rinse aid system, as can be used in program machines or in a conveyor dishwasher.

Um einen Flüssigkeitsdruck alternativ mit dem niedrigen Druck von beispielsweise 0,5 bar und einem hohen Druck von beispielsweise 1,0 bar zu erreichen, können gemäß der Erfindung zwei Standard-Pumpen hydraulisch in Reihe hintereinander geschaltet werden.In order to achieve a liquid pressure alternatively with the low pressure of, for example, 0.5 bar and a high pressure of, for example, 1.0 bar, according to the invention, two standard pumps can be hydraulically connected in series in series.

Die Erfindung benutzt vorteilhaft die Erkenntnis, dass sich die Drücke von zwei hydraulisch hintereinander angeordneten Pumpen addieren. Bei zwei hydraulisch hintereinander angeordneten gleich großen Kreiselpumpen verdoppelt sich somit der Druck in etwa. Der Volumenstrom wird dadurch nur unwesentlich verändert.Advantageously, the invention uses the knowledge that the pressures of two pumps arranged hydraulically one behind the other add up. With two hydraulic centrifugal pumps arranged one behind the other, the pressure is approximately doubled. The volume flow is thereby changed only insignificantly.

Für die Praxis bedeutet dies, dass sich für beide Pumpenanteile an der hydraulischen Leistung (Druck und Volumenstrom) den Pumpenanteilen entsprechende Leistungserhöhungen ergeben. Dies wird im Folgenden mit Bezug auf das Diagramm der Pumpenkennlinien von Fig. 1 erläutert.In practice, this means that for both pump parts on the hydraulic power (pressure and flow) the pump components corresponding increases in performance result. This will be described below with reference to the diagram of the pump characteristics of Fig. 1 explained.

Auf der vertikalen Achse des Kennliniendiagramms von Fig. 1 ist die Förderhöhe h in Meter (m) angegeben. Auf der horizontalen Achse des Kennliniendiagramms ist der Volumenstrom Q in m3/h angegeben. P1 bezeichnet die Pumpenkennlinie einer Pumpe 1; P2 bezeichnet die Pumpenkennlinie einer mit der Pumpe 1 in Reihe geschalteten weiteren Pumpe 2; und P1 + P2 bezeichnet die Pumpenkennlinie der Reihenschaltung von beiden Pumpen 1 und 2. Die Pumpenkennlinien kreuzen die Anlagenkennlinie "A", welche vom jeweiligen Leitungssystem der Geschirrspülmaschine abhängig ist. B1 bezeichnet einen Betriebspunkt der einen Pumpe 1; B2 bezeichnet einen Betriebspunkt der anderen Pumpe 2; und B3 bezeichnet einen Betriebspunkt der Reihenschaltung der beiden Pumpen 1 und 2.On the vertical axis of the characteristic diagram of Fig. 1 the head h is given in meters (m). On the horizontal axis of the characteristic diagram, the volume flow Q is given in m 3 / h. P1 denotes the pump characteristic of a pump 1; P2 denotes the pump characteristic of a further pump 2 connected in series with the pump 1; and P1 + P2 designates the pump characteristic of the series connection of both pumps 1 and 2. The pump characteristics cross the system characteristic "A", which depends on the respective pipe system of the dishwasher. B1 denotes an operating point of a pump 1; B2 denotes an operating point of the other pump 2; and B3 denotes an operating point of the series connection of the two pumps 1 and 2.

Das Kennliniendiagramm von Fig. 1 zeigt anhand der eingetragenen Höhen h1, h2 und h3, dass die Erhöhung zwischen jeder der einzelnen Pumpenkennlinien P1 und P2 und der gemeinsamen Kennlinie P1 + P2 der Reihenschaltung aus beiden Pumpen 1 und 2 umso kräftiger ausfällt, je steiler die Anlagenkennlinie "A" zwischen den Betriebspunkten B1, B2 und B3 ist. Auf der horizontalen Achse des Kennliniendiagramms zeigt sich für den Volumenstrom Q, dass die Erhöhung des Volumenstroms Q1 der einen Pumpe oder des Volumenstroms Q2 der anderen Pumpe zum Volumenstrom Q3 der Reihenschaltung aus beiden Pumpen relativ gering ausfällt.The characteristic diagram of Fig. 1 shows from the registered heights h1, h2 and h3, that the increase between each of the individual pump characteristics P1 and P2 and the common characteristic P1 + P2 of the series connection of both pumps 1 and 2 the stronger, the steeper the system characteristic "A" between the Operating points B1, B2 and B3. On the horizontal axis of the characteristic diagram, it can be seen, for the volume flow Q, that the increase in the volume flow Q1 of one pump or of the volume flow Q2 of the other pump to the volume flow Q3 of the series connection of the two pumps is relatively small.

Die Erfindung bietet die Möglichkeit, für den Niederdruckbetrieb nur die Pumpe 1 mit dem Druck P1 zu betreiben und für den Hochdruckbetrieb die Pumpe 1 mit dem Druck P1 und die Pumpe 2 mit dem Druck P2 mit kurzen Abständen hintereinander (oder gleichzeitig) zu starten und dann beide zusammen zu betreiben.The invention offers the possibility to operate for the low pressure operation only the pump 1 with the pressure P1 and for the high pressure operation, the pump 1 with the pressure P1 and the pump 2 with the pressure P2 at short intervals one behind the other (or simultaneously) to start and then to operate both together.

Beim Betrieb von beiden Pumpen 1 und 2 gleicher Bauweise in Reihenschaltung ergibt sich nahezu eine Verdoppelung des Flüssigkeitsdrucks an den Sprühdüsen der Geschirrspülmaschine, wenn beide Pumpen 1 und 2 identische Pumpenkennlinien haben.When operating both pumps 1 and 2 of the same construction in series connection results in almost a doubling of the liquid pressure at the spray nozzles Dishwasher, if both pumps 1 and 2 have identical pump characteristics.

Beim Betrieb der einen Pumpe 1 (oder Pumpe 2) allein verringert sich der Flüssigkeitsdruck durch hydraulische Verluste beim Durchströmen der Flüssigkeit durch die betreffende andere Pumpe 2 (oder Pumpe 1) nur geringfügig.In the operation of the one pump 1 (or pump 2) alone, the fluid pressure by hydraulic losses as it flows through the liquid through the other pump 2 (or pump 1) only slightly reduced.

An Stelle von gleichen Pumpen 1 und 2 können selbstverständlich auch zwei Pumpen verwendet werden, von welchen eine eine andere Leistung als die andere Pumpe oder eine eine andere Pumpenkennlinie als die andere Pumpe hat.Instead of the same pumps 1 and 2, of course, two pumps may be used, one of which has a different power than the other pump or a different pump characteristic than the other pump.

Beim Betrieb der Pumpe 2 mit dem Pumpendruck P2 allein kann deshalb der Flüssigkeitsdruck je nach Auslegung des Leitungssystems höher oder niedriger liegen als beim alleinigen Betrieb mit der Pumpe 1.When operating the pump 2 with the pump pressure P2 alone, therefore, the fluid pressure depending on the design of the line system may be higher or lower than when operating alone with the pump. 1

Somit bietet die Erfindung vorteilhaft auch die Möglichkeit, drei verschiedene Flüssigkeitsdrücke von Waschflüssigkeit oder Klarspülflüssigkeit durch die Kombination von nur zwei Pumpen 1 und 2 zu erreichen.Thus, the invention advantageously also offers the possibility of achieving three different liquid pressures of washing liquid or final rinse liquid by the combination of only two pumps 1 and 2.

Fig. 2 zeigt schematisch eine gewerbliche Geschirrspülmaschine in Form eines Programmautomaten gemäß der Erfindung. Sie enthält zwei in Reihe hintereinander angeordnete Pumpen 1 und 2, im Folgenden Waschpumpen genannt, in einer Waschflüssigkeits-Vorlaufleitung 4, welche das untere Ende eines Waschtanks 6 mit mindestens einem unteren Wascharm 8 und einem oberen Wascharm 10 hydraulisch verbindet. Die Wascharme 8 und 10 befinden sich in einer Behandlungskammer 12 unterhalb bzw. oberhalb des Spülgutaufnahmebereichs und sind jeweils mit Sprühdüsen 8-2 bzw. 10-2 versehen, welche gegen das Spülgut gerichtet sind. Fig. 2 schematically shows a commercial dishwasher in the form of a programmer according to the invention. It contains two in series successively arranged pumps 1 and 2, hereinafter referred to as washing pumps, in a washing liquid flow line 4, which connects the lower end of a wash tank 6 with at least one lower wash arm 8 and an upper wash arm 10 hydraulically. The washing arms 8 and 10 are located in a treatment chamber 12 below or above the Spülgutaufnahmebereichs and are each provided with spray nozzles 8-2 and 10-2, which are directed against the dishes.

Zum Zuführen von Reiniger in den Waschtank kann eine Reiniger-Dosierpumpe 13 vorgesehen sein.For supplying cleaner in the wash tank, a cleaner metering pump 13 may be provided.

Zur Kontrolle des Flüssigkeitsniveaus im Waschtank 6 kann ein Druckschalter 14 vorgesehen werden.To control the liquid level in the wash tank 6, a pressure switch 14 may be provided.

Zur Erwärmung der Waschflüssigkeit im Waschtank 6 kann eine Heizung 16 vorgesehen sein.For heating the washing liquid in the washing tank 6, a heater 16 may be provided.

An einen Sumpf 18 des Waschtanks 6 kann eine Ablaufleitung 20 mit einer Ablaufpumpe 22 angeschlossen sein.To a sump 18 of the wash tank 6, a drain line 20 may be connected to a drain pump 22.

Die beiden in Reihe (hintereinander) angeordneten Waschpumpen 1 und 2 von Fig. 2 werden von einer Steuereinrichtung 24 durch mindestens ein Anwenderprogramm einzeln oder in Kombination nach mindestens einer der Varianten eingeschaltet, die vorstehend mit Bezug auf die Fig. 1 beschrieben wurden bzw. in den Patentansprüchen definiert sind.The two in series (one behind the other) arranged washing pumps 1 and 2 of Fig. 2 are switched on by a control device 24 by at least one user program individually or in combination according to at least one of the variants described above with reference to the Fig. 1 have been described or defined in the claims.

Eine Frischwasserzufuhrleitung 26 ist an ihrem stromaufwärtigen Anfang über ein Magnetventil 28 mit einem Frischwasser-Zufuhrschlauch 30 verbindbar. Das stromabwärtige Ende der Frischwasserzufuhrleitung 26 ist mit einer Wassereinlaufvorrichtung 32 verbunden, über welche Frischwasser in einen Wassererwärmer 34 strömen kann. An den Wassererwärmer 34 ist eine Klarspüler-Zufuhrleitung, beispielsweise eine Klarspüler-Dosierpumpe 36 für die Zufuhr von Klarspüler in das Wasser des Wassererwärmers 34 angeschlossen. Die Klarspülflüssigkeit des Wassererwärmers 34 wird durch eine Klarspülpumpe 40 durch eine Klarspülflüssigkeits-Vorlaufleitung 42 zu mindestens einem unteren Spülarm 44 und mindestens einem oberen Spülarm 46 geleitet und durch darin gebildete Sprühdüsen 44-2 bzw. 46-2 in die Behandlungskammer 12 auf darin befindliches (nicht gezeigtes) Spülgut gesprüht.A fresh water supply line 26 is connectable at its upstream start via a solenoid valve 28 with a fresh water supply hose 30. The downstream end of the fresh water supply line 26 is connected to a water inlet device 32, via which fresh water can flow into a water heater 34. A rinse aid supply line, for example a rinse aid dosing pump 36 for the supply of rinse aid, is connected to the water heater 34 in the water of the water heater 34. The final rinse liquid of the water heater 34 is passed through a rinse aid 40 to a lower rinse arm 44 and at least one upper rinse arm 46, and through spray nozzles 44-2 and 46-2 respectively formed therein into the processing chamber 12 (FIG. not shown) ware sprayed.

Der Wassererwärmer 34 kann mit einer Entleervorrichtung 48 versehen sein.The water heater 34 may be provided with an emptying device 48.

Anstatt nur einer Klarspülpumpe 40 können zwei Klarspülpumpen in Reihe zueinander angeordnet werden und alternativ nach mindestens zwei verschiedenen Varianten eingeschaltet werden, wie sie mit Bezug auf die Figuren 1 und 2 für die Waschpumpen 1 und 2 beschrieben wurden.Instead of just one rinse pump 40, two rinse pumps can be arranged in series with one another and alternatively switched on according to at least two different variants, as described with reference to FIGS FIGS. 1 and 2 for the washing pumps 1 and 2 have been described.

Fig. 3 zeigt eine Transportgeschirrspülmaschine nach der Erfindung, welche beispielsweise in folgender Reihenfolge, in welcher Spülgut 250 von einer Transportvorrichtung 252 in Transportrichtung 254 transportiert wird, eine Vorwaschzone 262, eine erste Waschzone 264, eine zweite Waschzone 266 und eine Klarspülzone 268 enthält. Unter jeder Zone befindet sich ein Tank 263 bzw. 265 bzw. 267 bzw. 269 zur Aufnahme der in der betreffenden Zone versprühten Flüssigkeit. Die Tanks 269, 267, 265 und 263 bilden eine Kaskadenschaltung, in welcher Flüssigkeit in einer Flüssigkeitsrichtung 270 in den jeweils benachbarten Tank überläuft, wobei die Flüssigkeitsströmungsrichtung 270 von Tank zu Tank entgegengesetzt zur Transportrichtung 254 ist. Fig. 3 shows a transport dishwasher according to the invention, which, for example, in the following order, in which items 250 transported by a transport device 252 in the transport direction 254, a prewash zone 262, a first wash zone 264, a second wash zone 266 and a final rinse zone 268 contains. Below each zone is a tank 263 or 265 or 267 or 269 for receiving the liquid sprayed in the respective zone. The tanks 269, 267, 265 and 263 form a cascade circuit in which liquid in a liquid direction 270 overflows into the respectively adjacent tank, wherein the liquid flow direction 270 is opposite from tank to tank to the transport direction 254.

Über eine Klarspülfüssigkeits-Zufuhreinrichtung 272 ist Klarspülflüssigkeit zu Sprühdüsen 274 und 276 zuführbar, welche in der Klarspülzone 268 oberhalb und unterhalb der Transportvorrichtung 252 angeordnet sind.Via a rinse aid supply device 272, rinse liquid can be fed to spray nozzles 274 and 276, which are arranged in the final rinse zone 268 above and below the transport device 252.

Durch die eine und/oder die andere von zwei in Reihe hintereinander angeordneten Pumpen 201 und 202 in einem Waschflüssigkeits-Leitungssystem 278 ist Waschflüssigkeit aus dem zweiten Waschtank 267 zu Sprühdüsen 280 bzw. 282 förderbar, welche in der zweiten Waschzone 266 unterhalb und oberhalb der Transportvorrichtung 252 angeordnet sind. Die beiden in Reihe zueinander angeordneten Waschpumpen 201 und 202 sind in der gleichen Weise einzeln oder zusammen einschaltbar, wie dies vorstehend mit Bezug auf die Figuren 1 und 2 bezüglich der Pumpen 1 und 2 beschrieben wurde.By one and / or the other of two in series successively arranged pumps 201 and 202 in a washing liquid pipe system 278 washing liquid from the second washing tank 267 to spray nozzles 280 and 282 is conveyed, which in the second washing zone 266 below and above the transport device 252 are arranged. The two series-arranged washing pumps 201 and 202 are switched on in the same way individually or together, as described above with reference to the FIGS. 1 and 2 with respect to pumps 1 and 2 has been described.

In einem weiteren Waschflüssigkeits-Leitungssystem 284 befindet sich eine Reihenanordnung von zwei Waschpumpen 301 und 302 zur Förderung von Waschflüssigkeit aus dem Waschtank 265 zu unteren und oberen Sprühdüsen 286 bzw. 288 in der zweiten Waschzone 264. Die beiden in Reihe (hintereinander) angeordneten Pumpen 301 und 302 sind einzeln oder gemeinsam einschaltbar, wie dies vorstehend mit Bezug auf die Pumpen 1 und 2 der Figuren 1 und 2 beschrieben wurde.In another wash liquid line system 284 is a series arrangement of two wash pumps 301 and 302 for pumping wash liquid from the wash tank 265 to lower and upper spray nozzles 286 and 288 in the second wash zone 264. The two series (sequential) pumps 301 and 302 are individually or jointly switched on, as described above with respect to the pumps 1 and 2 of FIGS. 1 and 2 has been described.

In der Vorwaschzone 262 befinden sich untere Sprühdüsen 290 und obere Sprühdüsen 292 zum Sprühen von Vorwaschflüssigkeit 294 auf das zu reinigende Spülgut 250.In the pre-wash zone 262, lower spray nozzles 290 and upper spray nozzles 292 for spraying prewash liquid 294 are located on the washware 250 to be cleaned.

Die Transportgeschirrspülmaschine von Fig. 3 wird durch eine Steuereinrichtung 320 gesteuert, welche hierfür mindestens ein Anwendungsprogramm enthält.The transport dishwasher of Fig. 3 is controlled by a controller 320 which includes at least one application program therefor.

Fig. 4 zeigt eine weitere Ausführungsform einer Transportgeschirrspülmaschine nach der Erfindung, bei welcher mit Fig. 3 übereinstimmende Teile mit gleichen Bezugszahlen versehen sind und welche sich von Fig. 3 dadurch unterscheidet, dass die Klarspülflüssigkeits-Zufuhreinrichtung 272 die Klarspülflüssigkeit in den Klarspülflüssigkeits-Tank 269 leitet. Die Klarspülflüssigkeit wird aus dem Tank 269 durch die Reihenschaltung von zwei Pumpen 401 und 402 zu den unteren und oberen Sprühdüsen 274 bzw. 276 der Klarspülzone 268 gefördert. Die Klarspülflüssigkeit kann mit mindestens zwei verschiedenen Drücken gefördert werden, wie dies vorstehend mit Bezug auf die Pumpen 1 und 2 der Figuren 1 und 2 beschrieben wurde. Fig. 4 shows a further embodiment of a transport dishwasher according to the invention, in which Fig. 3 Matching parts are provided with the same reference numerals and which of Fig. 3 characterized *** in that the final rinse liquid supply means 272 directs the final rinse liquid into the final rinse liquid tank 269. The rinse liquid is conveyed from the tank 269 by the series connection of two pumps 401 and 402 to the lower and upper spray nozzles 274 and 276, respectively, of the final rinse zone 268. The final rinse liquid can be delivered with at least two different pressures, as described above with respect to the pumps 1 and 2 of FIG FIGS. 1 and 2 has been described.

Gemäß einer nochmals weiteren Ausführungsform der Erfindung, welche in den Zeichnungen nicht dargestellt ist, besteht auch die Möglichkeit, mit der Reihenschaltung von zwei Pumpen Flüssigkeit vom Tank einer Zone zu Sprühdüsen zu fördern, welche sich in einer anderen Zone befinden.According to yet another embodiment of the invention, which is not shown in the drawings, there is also the possibility, with the series connection of two pumps to convey liquid from the tank of one zone to spray nozzles, which are located in another zone.

Bei allen Ausführungsformen der Erfindung ist die Steuereinrichtung derart ausgebildet, dass von den möglichen Betriebsvarianten einer Reihenschaltung von zwei Pumpen mindestens zwei Varianten alternativ ausführbar sind:

  • Einschalten nur der stromaufwärtigen Pumpe,
  • Einschalten nur der stromabwärtigen Pumpe,
  • Einschalten von beiden Pumpen, sodass beide Pumpen mindestens teilweise zeitgleich Flüssigkeit fördern. Zum gleichzeitigen Betrieb von beiden Pumpen bestehen die Varianten, entweder beide Pumpen gleichzeitig einzuschalten oder eine Pumpe zeitverzögert nach der anderen Pumpe zusätzlich einzuschalten.
In all embodiments of the invention, the control device is designed in such a way that at least two variants of the possible operating variants of a series connection of two pumps are alternatively executable:
  • Switching on only the upstream pump,
  • Switching on only the downstream pump,
  • Switching on both pumps so that both pumps deliver liquid at least partially at the same time. For the simultaneous operation of both pumps, there are the variants either to turn on both pumps at the same time or to additionally switch on a pump with a time delay after the other pump.

Das Einschalten der Varianten erfolgt vorzugsweise automatisch durch mindestens ein Anwendungsprogramm (Reinigungsprogramm) der Steuereinrichtung. Ferner sind auch Ausführungsformen der Erfindung möglich, bei welchen das Einschalten der Varianten nur manuell möglich ist oder alternativ automatisch oder manuell möglich ist.The variants are preferably switched on automatically by at least one application program (cleaning program) of the control device. Furthermore, embodiments of the invention are possible in which the switching on of the variants is only possible manually or alternatively is possible automatically or manually.

Anstatt von zwei Pumpen können auch mehrere, beispielsweise drei Pumpen hydraulisch in Reihe (hintereinander) angeordnet werden.Instead of two pumps, several, for example, three pumps can be arranged hydraulically in series (one behind the other).

Claims (19)

  1. Commercial dishwasher comprising at least one tank (6; 263, 265, 267, 269; 34); spray nozzles (44-2, 46-2, 8-2, 10-2; 274, 276, 280, 282, 286, 288, 290, 292) for spraying liquid into a treatment region in the form of a treatment chamber (12) or a treatment zone (262, 264, 266, 268) for treating items to be washed; at least two centrifugal pumps (1, 2; 40; 201, 202; 301, 302; 401, 402) for conveying liquid from the tank to the spray nozzles; a control device (320) for switching on at least one of the at least two centrifugal pumps (1, 2; 40; 201, 202; 301, 302; 401, 402), characterized in that the at least two centrifugal pumps (1, 2; 40; 201, 202; 301, 302; 401, 402) are arranged hydraulically in series one behind the other and the control device (320) is designed for alternatively operating only one centrifugal pump or at least two of the centrifugal pumps which are connected hydraulically in series one behind the other, in order to thus change the liquid pressure with which the liquid is sprayed into the treatment region for treating items to be washed.
  2. Dishwasher according to Claim 1, wherein the suction side of the upstream centrifugal pump (1; 40; 201; 301; 401) is or can be connected to the contents of the tank, and the pressure side of the downstream centrifugal pump (2; 40; 202; 302; 402) is or can be connected to the spray nozzles.
  3. Dishwasher according to either of the preceding claims, wherein the upstream centrifugal pump (1) on its own, without the at least one further centrifugal pump (2), can be switched on by the control device.
  4. Dishwasher according to one of the preceding claims, wherein the downstream centrifugal pump (2) on its own, without the at least one further centrifugal pump (1), can be switched on by the control device.
  5. Dishwasher according to one of the preceding claims, wherein the control device (24; 320) is designed in order to automatically first switch on only one of the centrifugal pumps (1, 2) and only after a time interval then additionally switch on at least one further centrifugal pump (2, 1), and to operate the switched-on centrifugal pumps hydraulically in series, with the result that two different liquid pressures are generated one after the other, of which the first liquid pressure is lower than the second liquid pressure.
  6. Dishwasher according to Claim 5, wherein the time interval is defined by a predetermined delay time.
  7. Dishwasher according to Claim 5, wherein the time interval is dependent on a predetermined operating criterion.
  8. Dishwasher according to Claim 7, wherein the predetermined operating criterion is one of the following: type of item to be washed, degree of soiling of the item to be washed, degree of soiling of the liquid.
  9. Dishwasher according to one of the preceding claims, wherein the control device (24; 320) is designed in such a way that all the centrifugal pumps are switched off at the same time.
  10. Dishwasher according to one of Claims 1 to 8, wherein the control device (24; 320) is designed in such a way that the centrifugal pumps are switched off one after the other.
  11. Dishwasher according to one of the preceding claims, wherein all the centrifugal pumps are designed for the same delivery rate.
  12. Dishwasher according to one of Claims 1 to 10, wherein one of the centrifugal pumps has a different delivery rate to at least one of the other centrifugal pumps.
  13. Dishwasher according to one of the preceding claims, wherein all the centrifugal pumps have identical pump characteristic curves.
  14. Dishwasher according to one of Claims 1 to 12, wherein the centrifugal pumps have different pump characteristic curves.
  15. Dishwasher according to one of the preceding claims, wherein the dishwasher is a program-controlled dishwasher with a treatment chamber (12) into which the items to be washed can be manually inserted.
  16. Dishwasher according to one of Claims 1 to 14, wherein the dishwasher is a conveyor-type dishwasher comprising at least two treatment zones (262, 264, 266, 268) and a delivery apparatus (252) for automatically transporting items being washed through the treatment zones.
  17. Dishwasher according to one of the preceding claims, wherein the treatment region is a wash chamber or a wash zone and the liquid is wash liquid.
  18. Dishwasher according to one of the preceding claims, wherein the treatment region (12) is a final rinse chamber or a final rinse zone (268) and the liquid is final rinse liquid.
  19. Method for operating a commercial dishwasher according to one of the preceding claims, characterized in that the liquid pressure with which the liquid is sprayed into the treatment chamber for treating the items to be washed is automatically varied by program-controlled actuation of at least two centrifugal pumps which are arranged in series one behind the other.
EP08156113A 2007-05-26 2008-05-13 Commercial dishwasher Active EP1997420B1 (en)

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EP1997420A2 (en) 2008-12-03
CA2632296A1 (en) 2008-11-26
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CN101366619B (en) 2014-01-29
US8394204B2 (en) 2013-03-12
DE102007024799A1 (en) 2008-11-27
US20080289655A1 (en) 2008-11-27
EP1997420A3 (en) 2009-03-18
CA2632296C (en) 2011-03-15

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