EP1752080B1 - Transport-type dishwasher with means for reducing dirtiness of the washing fluid - Google Patents

Transport-type dishwasher with means for reducing dirtiness of the washing fluid Download PDF

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Publication number
EP1752080B1
EP1752080B1 EP06012920A EP06012920A EP1752080B1 EP 1752080 B1 EP1752080 B1 EP 1752080B1 EP 06012920 A EP06012920 A EP 06012920A EP 06012920 A EP06012920 A EP 06012920A EP 1752080 B1 EP1752080 B1 EP 1752080B1
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EP
European Patent Office
Prior art keywords
wash
liquid
wash liquid
filtration
section
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EP06012920A
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German (de)
French (fr)
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EP1752080A2 (en
EP1752080A3 (en
Inventor
Dietrich Berner
Klaus Dr. Padtberg
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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
    • A47L15/247—Details specific to conveyor-type machines, e.g. curtains

Definitions

  • the invention relates to a transport dishwasher in the form of a belt conveyor dishwasher or a basket conveyor dishwasher according to the preamble of claim 1.
  • Such a transport dishwasher is for example from the document CH 262 228 A known.
  • This prior art relates to a transport dishwasher, which has at least one washing zone, in which washing liquid is sprayed onto the items to be cleaned.
  • a wash tank for receiving sprayed washing liquid from the treatment chamber.
  • a washing pump is provided below the treatment chamber belonging to the treatment chamber.
  • the washing pump serves to convey washing liquid from the washing tank via a washing liquid line system to washing nozzles.
  • the washing nozzles are directed in the treatment chamber to the area of the items to be cleaned, to spray washing liquid on the items to be cleaned.
  • the sprayed washing liquid flows back into the wash tank by gravity.
  • the document EP 0 995 483 A1 discloses a filter device having a microfiltration device or an ultrafiltration device.
  • the washware is transported by a transport device through one or more wash zones and a final rinse zone of the conveyor warewashing machine. From zone to zone, a fluid cascade is formed whose flow direction of the Transport direction is opposite. When the liquid cascade is interrupted, the washing liquid in the wash tanks of the liquid cascade no longer receives regeneration by dilution with fresh water. Depending on the entry of dirt from the items to be washed into the washing liquid (wash liquid), this washing liquid can become very dirty, so that this results in a reduced cleaning capacity.
  • the problem to be solved is to keep the cleaning efficiency constant throughout the service life.
  • a microfiltration device or an ultrafiltration device according to the invention can be provided for one or more wash zones. Preferably, this is located in the wash tank of the washing zone concerned Washing liquid processed in a cycle. For this treatment of the wash water no fresh water (fresh water) is needed, but it will only remove the contaminants located in the washing liquid from the washing liquid.
  • Wash liquid is water to which detergent (detergent) is added.
  • Rinse aid may be fresh water with or without rinse aid.
  • the conveyor-type warewashing machine can be a flight-type goods washer in which the washware to be cleaned is transported by a conveyor belt through the machine, or a basket transport dishwasher (FIG. Rack conveyor ware washer), in which the wash ware is transported in baskets on the transport device through the machine.
  • a flight-type goods washer in which the washware to be cleaned is transported by a conveyor belt through the machine
  • a basket transport dishwasher FIG. Rack conveyor ware washer
  • the transport dishwasher of Fig. 1 contains a transport device 2, the transport direction 4 is indicated by an arrow.
  • the washware may be of any type, eg. As plates, cups, glasses, cutlery, trays, pots, pans.
  • the transport dishwasher contains at least one, z. B. according to the drawings two (or more) in the transport direction 4 successively arranged wash zones 6 and 8 (wash zones) for washing the dishes with wash liquid (wash liquid), and a rinse zone 14 (final rinse zone) for rinsing (final rinse) of Wash ware with rinse aid (final rinse liquid).
  • the washing liquid is water to which detergent is added.
  • Final rinse liquid may be fresh water with or without rinse aid.
  • each washing zone 6 and 8 are upper and lower washing nozzles 20, 22 and 24, 26 for spraying washing liquid (wash liquid) on the washware, which is located on the transport device 2.
  • the washing zones 6 and 8 are each provided with a wash tank 28 or 30 (wash tank), in which washing liquid sprayed from the washing nozzles 20, 22 or 24, 26 collects. From the washing tanks 28 and 30, washing liquid is recirculated back to the washing nozzles 20, 22 and 24, 26, respectively, by a washing liquid supply pipe 38 and 40, each containing a pump 34 and 36, respectively.
  • the wash liquid supply line 38 or 40 and the associated wash tank 28 or 30 form a washing liquid Rezirkulationsstrang 28/38 and 30/40.
  • Each washing liquid recirculation line 28/38 or 30/40 together with the associated washing zone 6 or 8 and their washing nozzles 20, 22 and 24, 26, a washing liquid recirculation circuit.
  • the rinse zone 14 (final rinse zone) is provided with upper and lower rinsing spray nozzles 42 and 44, respectively, to which rinse liquid (final rinse liquid) can be supplied via a final rinse liquid supply line 46.
  • the sprayed rinse liquid collects in a rinse tank 48 (post-wash tank).
  • This pre-rinse liquid is supplied through a post-wash liquid supply line 50 containing a pump 51 to upper and lower post-wash nozzles 52 and 54, respectively.
  • the Nachwaschcroftkeit is thus pre-used final rinse liquid.
  • post-wash zone 12 may also be referred to as a pre-rinse zone
  • post-wash liquid may also be referred to as a pre-rinse liquid.
  • the post-wash tank 48 can also be referred to as a pre-rinse tank.
  • the Nachwaschlotkeit sprayed by the Nachwasch spray nozzles 52 and 54 passes partially into the Nachwaschtank 48 and partially via a guide plate 60 in the last wash tank 30th
  • the wash tanks 28 and 30 and the Nachwaschtank 48 form a liquid cascade system in which the liquid overflows from one to the other tank against the transport direction 4 of the transport device 2.
  • liquid from the rinse tank 48 flows into the last wash tank 30 and from there into the next wash tank 28.
  • the last wash tank 28 in this flow direction which is the first tank in the transport direction 4, is preferably provided with a dirty liquid drain 62.
  • a dryer 64 may be arranged for drying the cleaned items to be washed.
  • a washing liquid filtration strand 70 is provided for the removal and then filtration of sprayed washing liquid from the washing liquid recirculation line 30/40 of the respective washing zone 8 and for returning filtered washing liquid to the same washing liquid recirculation line 30 / 40th
  • the scrubbing liquid filtration column 70 contains a microfiltration device 72 or an ultrafiltration device 72 for filtering the scrubbing liquid.
  • the essential difference between the microfiltration and the ultrafiltration lies in the different pore sizes of the filter elements. Filtration through filter elements having a pore size ⁇ 0.1 .mu.m is called ultrafiltration, while filtration at pore sizes> 0.1 .mu.m to 100 .mu.m is referred to as microfiltration.
  • the scrubbing liquid filtration strand 70 is preferably formed as a filtration circuit, in which a portion 30 of the scrubbing liquid Rezirkulationsstrangs 30/40 is integrated, so that from this section 30 scrubbing liquid flows into the scrubbing liquid filtration strand 70 and after filtering the scrubbing liquid the filtered washing liquid part flows back into this section 30 again.
  • the section 30 may theoretically be any element of the scrubbing liquid recirculation line 30/40, but is preferably the scrubbing tank 30 of the scrubbing zone 8 in question.
  • the microfiltration device 72 or the ultrafiltration device 72 has a cross-flow filter 74 for microfiltration or ultrafiltration of the sprayed washing liquid.
  • the cross-flow filter 74 contains at least one primary chamber 76 and at least one secondary chamber 78, which are separated from each other by at least one microfiltration element 80 or at least one ultrafiltration element 80.
  • a portion of the scrubbing liquid filtration string 70 is formed by an internal recirculation circuit 82 for recirculating unfiltered scrubbing liquid, in which the primary chamber 76 and downstream of the primary chamber 76, a liquid collection element 84 are arranged.
  • a feed section 86 of the scrubbing liquid filtration line 70 for supplying sprayed scrubbing liquid from the scrubbing liquid recirculation line 30/40 also opens into the liquid collecting element 84.
  • the secondary chamber 78 serves to receive the washing liquid part filtered by the at least one microfiltration element 80 or ultrafiltration element 80, which is a partial flow of the main flow of washing liquid flowing into the primary chamber 76.
  • the internal recirculation circuit 82 includes a pump 88 for supplying wash liquid from the liquid collection element 84 into the primary chamber 76.
  • the liquid collection element 84 is preferably a collection tank for receiving sprayed wash liquid from the wash liquid recirculation strand 30/40 of the at least one wash zone 8 and for receiving wash liquid which is returned from the primary chamber 76 to the collection tank 84.
  • the collection tank 84 is preferably designed to collect dirt and provided with a dirt outlet 90 for removing debris from the washing liquid.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Description

Die Erfindung betrifft eine Transport-Geschirrspülmaschine in Form einer Bandtransport-Geschirrspülmaschine oder einer Korbtransport-Geschirrspülmaschine gemäß dem Oberbegriff von Anspruch 1.The invention relates to a transport dishwasher in the form of a belt conveyor dishwasher or a basket conveyor dishwasher according to the preamble of claim 1.

Eine derartige Transport-Geschirrspülmaschine ist beispielsweise aus dem Dokument CH 262 228 A bekannt. Dieser Stand der Technik betrifft eine Transport-Geschirrspülmaschine, welche mindestens eine Waschzone aufweist, in welcher Waschflüssigkeit auf das zu reinigende Spülgut gesprüht wird. Unter der zur Waschzone gehörenden Behandlungskammer befindet sich ein Waschtank zur Aufnahme von versprühter Waschflüssigkeit aus der Behandlungskammer. Ferner ist eine Waschpumpe vorgesehen. Die Waschpumpe dient dazu, Waschflüssigkeit aus dem Waschtank über ein Waschflüssigkeitsleitungssystem zu Waschdüsen zu fördern. Die Waschdüsen sind in der Behandlungskammer auf den Bereich des zu reinigenden Spülgutes gerichtet, um Waschflüssigkeit auf das zu reinigende Spülgut zu versprühen. Die versprühte Waschflüssigkeit strömt durch Schwerkraft in den Waschtank zurück.Such a transport dishwasher is for example from the document CH 262 228 A known. This prior art relates to a transport dishwasher, which has at least one washing zone, in which washing liquid is sprayed onto the items to be cleaned. Below the treatment chamber belonging to the treatment chamber is a wash tank for receiving sprayed washing liquid from the treatment chamber. Furthermore, a washing pump is provided. The washing pump serves to convey washing liquid from the washing tank via a washing liquid line system to washing nozzles. The washing nozzles are directed in the treatment chamber to the area of the items to be cleaned, to spray washing liquid on the items to be cleaned. The sprayed washing liquid flows back into the wash tank by gravity.

Das Dokument EP 0 995 483 A1 offenbart eine Filtereinrichtung, welche eine Mikrofiltrationseinrichtung oder eine Ultrafiltrationseinrichtung aufweist.The document EP 0 995 483 A1 discloses a filter device having a microfiltration device or an ultrafiltration device.

Weitere Transport-Geschirrspülmaschinen sind beispielsweise aus der US 3,789,860 ; US 4,231,806 ; DE 196 44 438 C2 und DE 198 29 650 C2 bekannt.Further transport dishwashers are for example from the US 3,789,860 ; US 4,231,806 ; DE 196 44 438 C2 and DE 198 29 650 C2 known.

Das Spülgut (wash ware) wird von einer Transportvorrichtung durch eine oder mehrere Waschzonen (wash zones) und eine Klarspülzone (final rinse zone) der Transport-Geschirrspülmaschine (conveyor ware washer) hindurchtransportiert. Von Zone zu Zone ist eine Flüssigkeitskaskade gebildet, deren Fließrichtung der Transportrichtung entgegengesetzt ist. Wenn die Flüssigkeitskaskade unterbrochen wird, so bekommt die Waschflüssigkeit in den Waschtanks der Flüssigkeitskaskade keine Regeneration durch Verdünnung mit Frischwasser (fresh water) mehr. Je nach Schmutzeintrag von dem zu reinigenden Spülgut in die Waschflüssigkeit (wash liquid) kann diese Waschflüssigkeit sehr stark verschmutzen, sodass dies eine reduzierte Reinigungskapazität zur Folge hat.The washware is transported by a transport device through one or more wash zones and a final rinse zone of the conveyor warewashing machine. From zone to zone, a fluid cascade is formed whose flow direction of the Transport direction is opposite. When the liquid cascade is interrupted, the washing liquid in the wash tanks of the liquid cascade no longer receives regeneration by dilution with fresh water. Depending on the entry of dirt from the items to be washed into the washing liquid (wash liquid), this washing liquid can become very dirty, so that this results in a reduced cleaning capacity.

Durch die Erfindung soll die Aufgabe gelöst werden, den Reinigungswirkungsgrad während der gesamten Betriebsdauer konstant zu halten.By the invention, the problem to be solved is to keep the cleaning efficiency constant throughout the service life.

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.

Durch die Verwendung eines Mikrofiltrationsverfahrens oder eines Ultrafiltrationsverfahrens wird einer starken Verschmutzung der Waschflüssigkeit aktiv entgegengewirkt und diese dadurch verhindert. Hierbei wird auch die Belastung des Abwassers der Transport-Geschirrspülmaschine durch organische Verbindungen reduziert. Durch diese Reduzierung von organischen Verbindungen im Abwasser können auch die Abwasserkosten reduziert werden.By using a microfiltration process or an ultrafiltration process, a strong contamination of the washing liquid is actively counteracted and thereby prevented. Here, the load of the waste water of the transport dishwasher is reduced by organic compounds. This reduction of organic compounds in wastewater can also reduce wastewater costs.

Eine Mikrofiltrationseinrichtung oder eine Ultrafiltrationseinrichtung gemäß der Erfindung kann für eine oder mehrere Waschzonen vorgesehen werden. Vorzugsweise wird dabei die im Waschtank der betreffenden Waschzone befindliche Waschflüssigkeit in einem Kreislauf aufbereitet. Für diese Aufbereitung des Waschwassers wird kein Frischwasser (fresh water) benötigt, sondern es werden lediglich die in der Waschflüssigkeit befindlichen Verschmutzungen aus der Waschflüssigkeit entfernt.A microfiltration device or an ultrafiltration device according to the invention can be provided for one or more wash zones. Preferably, this is located in the wash tank of the washing zone concerned Washing liquid processed in a cycle. For this treatment of the wash water no fresh water (fresh water) is needed, but it will only remove the contaminants located in the washing liquid from the washing liquid.

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

Waschflüssigkeit (wash liquid) ist Wasser, welchem Reiniger (detergent) zudosiert wird. Klarspülflüssigkeit kann Frischwasser mit oder ohne Klarspüler (rinse aid) sein.Wash liquid (wash liquid) is water to which detergent (detergent) is added. Rinse aid may be fresh water with or without rinse aid.

Die Erfindung wird im Folgenden mit Bezug auf die beiliegende Zeichnung anhand einer bevorzugten Ausführungsform als Beispiel beschrieben. In der Zeichnung zeigt

Fig.1
schematisch eine Transport-Geschirrspülmaschine nach der Erfindung.
The invention will be described below with reference to the accompanying drawings with reference to a preferred embodiment as an example. In the drawing shows
Fig.1
schematically a transport dishwasher according to the invention.

Die Transport-Geschirrspülmaschine (conveyor ware washer) nach der Erfindung kann eine Bandtransport-Geschirrspülmaschine (flight-type ware washer), in welcher das zu reinigende Spülgut (wash ware) von einem Transportband durch die Maschine transportiert wird, oder eine Korbtransport-Geschirrspülmaschine (rack conveyor ware washer) sein, bei welcher das Spülgut (wash ware) in Körben auf der Transportvorrichtung durch die Maschine transportiert wird.The conveyor-type warewashing machine according to the invention can be a flight-type goods washer in which the washware to be cleaned is transported by a conveyor belt through the machine, or a basket transport dishwasher (FIG. Rack conveyor ware washer), in which the wash ware is transported in baskets on the transport device through the machine.

Die Transport-Geschirrspülmaschine von Fig. 1 enthält eine Transportvorrichtung 2, deren Transportrichtung 4 durch einen Pfeil angegeben ist. Das nicht gezeigte Spülgut (wash ware) kann von beliebiger Art sein, z. B. Teller, Tassen, Gläser, Besteck, Tabletts, Töpfe, Pfannen.The transport dishwasher of Fig. 1 contains a transport device 2, the transport direction 4 is indicated by an arrow. The washware, not shown, may be of any type, eg. As plates, cups, glasses, cutlery, trays, pots, pans.

Die Transport-Geschirrspülmaschine enthält mindestens eine, z. B. entsprechend den Zeichnungen zwei (oder mehr) in Transportrichtung 4 aufeinanderfolgend angeordnete Waschzonen 6 und 8 (wash zones) zum Waschen des Spülgutes mit Waschflüssigkeit (wash liquid), und eine Klarspülzone 14 (final rinse zone) zum Klarspülen (final rinse) des Spülgutes (wash ware) mit Klarspülflüssigkeit (final rinse liquid). Die Waschflüssigkeit ist Wasser, welchem Reiniger (detergent) zudosiert wird. Klarspülflüssigkeit (final rinse liquid) kann Frischwasser mit oder ohne zudosiertem Klarspüler (rinse aid) sein.The transport dishwasher contains at least one, z. B. according to the drawings two (or more) in the transport direction 4 successively arranged wash zones 6 and 8 (wash zones) for washing the dishes with wash liquid (wash liquid), and a rinse zone 14 (final rinse zone) for rinsing (final rinse) of Wash ware with rinse aid (final rinse liquid). The washing liquid is water to which detergent is added. Final rinse liquid may be fresh water with or without rinse aid.

In jeder Waschzone 6 und 8 befinden sich obere und untere Waschdüsen 20, 22 bzw. 24, 26 zum Sprühen von Waschflüssigkeit (wash liquid) auf das Spülgut (wash ware), welches sich auf der Transportvorrichtung 2 befindet. Die Waschzonen 6 und 8 sind jeweils mit einem Waschtank 28 bzw. 30 (wash tank) versehen, in welchem sich von den Waschdüsen 20, 22 bzw. 24, 26 versprühte Waschflüssigkeit sammelt. Aus den Waschtanks 28 bzw. 30 wird Waschflüssigkeit zu den Waschdüsen 20, 22 bzw. 24, 26 zurück rezirkuliert durch eine Waschflüssigkeits-Zufuhrleitung 38 bzw. 40, die jeweils eine Pumpe 34 bzw. 36 enthält. Die Waschflüssigkeits-Zufuhrleitung 38 bzw. 40 und der zugehörige Waschtank 28 bzw. 30 bilden einen Waschflüssigkeits-Rezirkulationsstrang 28/38 bzw. 30/40. Jeder Waschflüssigkeits-Rezirkulationsstrang 28/38 bzw. 30/40 bildet zusammen mit der zugehörigen Waschzone 6 bzw. 8 und deren Waschdüsen 20, 22 bzw. 24, 26 einen Waschflüssigkeits-Rezirkulationskreislauf.In each washing zone 6 and 8 are upper and lower washing nozzles 20, 22 and 24, 26 for spraying washing liquid (wash liquid) on the washware, which is located on the transport device 2. The washing zones 6 and 8 are each provided with a wash tank 28 or 30 (wash tank), in which washing liquid sprayed from the washing nozzles 20, 22 or 24, 26 collects. From the washing tanks 28 and 30, washing liquid is recirculated back to the washing nozzles 20, 22 and 24, 26, respectively, by a washing liquid supply pipe 38 and 40, each containing a pump 34 and 36, respectively. The wash liquid supply line 38 or 40 and the associated wash tank 28 or 30 form a washing liquid Rezirkulationsstrang 28/38 and 30/40. Each washing liquid recirculation line 28/38 or 30/40 together with the associated washing zone 6 or 8 and their washing nozzles 20, 22 and 24, 26, a washing liquid recirculation circuit.

Die Klarspülzone 14 (final rinse zone) ist mit oberen und unteren Klarspül-Sprühdüsen 42 bzw. 44 versehen, welchen Klarspülflüssigkeit (final rinse liquid) über eine Klarspülflüssigkeits-Zufuhrleitung 46 zuführbar ist. Die versprühte Klarspülflüssigkeit sammelt sich in einem Nachwaschtank 48 (post-wash tank). Diese vorbenutzte Klarspülflüssigkeit wird durch eine Nachwaschflüssigkeits-Zufuhrleitung 50, welche eine Pumpe 51 enthält, oberen und unteren Nachwaschdüsen 52 bzw. 54 zugeführt. Die Nachwaschflüssigkeit ist somit vorbenutzte Klarspülflüssigkeit. Aus diesem Grunde kann die Nachwaschzone 12 (post-wash zone) auch als Vorspülzone (pre-rinse zone) bezeichnet werden und die Nachwaschflüssigkeit (post-wash liquid) kann auch als Vorspülflüssigkeit (pre-rinse liquid) bezeichnet werden.The rinse zone 14 (final rinse zone) is provided with upper and lower rinsing spray nozzles 42 and 44, respectively, to which rinse liquid (final rinse liquid) can be supplied via a final rinse liquid supply line 46. The sprayed rinse liquid collects in a rinse tank 48 (post-wash tank). This pre-rinse liquid is supplied through a post-wash liquid supply line 50 containing a pump 51 to upper and lower post-wash nozzles 52 and 54, respectively. The Nachwaschflüssigkeit is thus pre-used final rinse liquid. For this reason, post-wash zone 12 may also be referred to as a pre-rinse zone, and post-wash liquid may also be referred to as a pre-rinse liquid.

Entsprechend kann der Nachwaschtank 48 (post-wash tank) auch als Vorspültank (pre-rinse tank) bezeichnet werden.Accordingly, the post-wash tank 48 can also be referred to as a pre-rinse tank.

Die von den Nachwasch-Sprühdüsen 52 und 54 versprühte Nachwaschflüssigkeit gelangt teilweise in den Nachwaschtank 48 und teilweise über ein Leitblech 60 in den letzten Waschtank 30.The Nachwaschflüssigkeit sprayed by the Nachwasch spray nozzles 52 and 54 passes partially into the Nachwaschtank 48 and partially via a guide plate 60 in the last wash tank 30th

Die Waschtanks 28 und 30 und der Nachwaschtank 48 bilden ein Flüssigkeitskaskadensystem, in welchem die Flüssigkeit von einem zum anderen Tank entgegen der Transportrichtung 4 der Transportvorrichtung 2 überläuft. Somit läuft Flüssigkeit von dem Nachwaschtank 48 in den letzten Waschtank 30 und von diesem in den nächsten Waschtank 28. Der in dieser Fließrichtung letzte Waschtank 28, welcher der in Transportrichtung 4 erste Tank ist, ist vorzugsweise mit einem Ablauf 62 für verschmutzte Flüssigkeit versehen.The wash tanks 28 and 30 and the Nachwaschtank 48 form a liquid cascade system in which the liquid overflows from one to the other tank against the transport direction 4 of the transport device 2. Thus, liquid from the rinse tank 48 flows into the last wash tank 30 and from there into the next wash tank 28. The last wash tank 28 in this flow direction, which is the first tank in the transport direction 4, is preferably provided with a dirty liquid drain 62.

In Transportrichtung 4 nach der Klarspülzone 14 kann ein Trockner 64 zum Trocknen des gereinigten Spülgutes angeordnet sein.In the transport direction 4 after the final rinse zone 14, a dryer 64 may be arranged for drying the cleaned items to be washed.

Gemäß der Erfindung ist für mindestens eine, vorzugsweise für zwei oder mehr oder alle Waschzonen 6 und 8, wie es in Fig. 1 als Beispiel anhand der letzten Waschzone 8 dargestellt ist, ein Waschflüssigkeits-Filtrationsstrang 70 vorgesehen zur Entnahme und dann zur Filterung von versprühter Waschflüssigkeit aus dem Waschflüssigkeits-Rezirkulationsstrang 30/40 der betreffenden Waschzone 8 und zur Rückführung von gefilterter Waschflüssigkeit in den selben Waschflüssigkeits-Rezirkulationsstrang 30/40. Der Waschflüssigkeits-Filtrationsstrang 70 enthält zum Filtern der Waschflüssigkeit eine Mikrofiltrationseinrichtung 72 oder eine Ultrafiltrationseinrichtung 72. Der wesentliche Unterschied zwischen der Mikrofiltration und der Ultrafiltration liegt in den verschiedenen Porengrößen der Filterelemente. Eine Filtration durch Filterelemente mit einer Porengröße < 0,1 µm wird Ultrafiltration genannt, während eine Filtration bei Porengrößen > 0,1 µm bis 100 µm als Mikrofiltration bezeichnet wird.According to the invention, for at least one, preferably for two or more or all washing zones 6 and 8, as shown in FIG Fig. 1 by way of example with reference to the last washing zone 8, a washing liquid filtration strand 70 is provided for the removal and then filtration of sprayed washing liquid from the washing liquid recirculation line 30/40 of the respective washing zone 8 and for returning filtered washing liquid to the same washing liquid recirculation line 30 / 40th The scrubbing liquid filtration column 70 contains a microfiltration device 72 or an ultrafiltration device 72 for filtering the scrubbing liquid. The essential difference between the microfiltration and the ultrafiltration lies in the different pore sizes of the filter elements. Filtration through filter elements having a pore size <0.1 .mu.m is called ultrafiltration, while filtration at pore sizes> 0.1 .mu.m to 100 .mu.m is referred to as microfiltration.

Der Waschflüssigkeits-Filtrationsstrang 70 ist vorzugsweise als Filtrationskreislauf ausgebildet, in welchen ein Abschnitt 30 des Waschflüssigkeits-Rezirkulationsstrangs 30/40 integriert ist, sodass aus diesem Abschnitt 30 Waschflüssigkeit in den Waschflüssigkeits-Filtrationsstrang 70 fließt und nach Filterung der Waschflüssigkeit der gefilterte Waschflüssigkeitsteil wieder in diesen Abschnitt 30 zurückfließt. Der Abschnitt 30 kann theoretisch jedes Element des Waschflüssigkeits-Rezirkulationsstrangs 30/40 sein, ist jedoch vorzugsweise der Waschtank 30 der betreffenden Waschzone 8.The scrubbing liquid filtration strand 70 is preferably formed as a filtration circuit, in which a portion 30 of the scrubbing liquid Rezirkulationsstrangs 30/40 is integrated, so that from this section 30 scrubbing liquid flows into the scrubbing liquid filtration strand 70 and after filtering the scrubbing liquid the filtered washing liquid part flows back into this section 30 again. The section 30 may theoretically be any element of the scrubbing liquid recirculation line 30/40, but is preferably the scrubbing tank 30 of the scrubbing zone 8 in question.

Gemäß der bevorzugten Ausführungsform der Erfindung weist die Mikrofiltrationseinrichtung 72 oder die Ultrafiltrationseinrichtung 72 einen Querstromfilter 74 zur Mikrofiltration oder zur Ultrafiltration der versprühten Waschflüssigkeit auf.According to the preferred embodiment of the invention, the microfiltration device 72 or the ultrafiltration device 72 has a cross-flow filter 74 for microfiltration or ultrafiltration of the sprayed washing liquid.

Der Querstromfilter 74 enthält mindestens eine Primärkammer 76 und mindestens eine Sekundärkammer 78, welche durch mindestens ein Mikrofiltrationselement 80 oder mindestens ein Ultrafiltrationselement 80 voneinander getrennt sind. Ein Abschnitt des Waschflüssigkeits-Filtrationsstrangs 70 ist durch einen internen Rezirkulationskreislauf 82 zur Rezirkulation von ungefilterter Waschflüssigkeit gebildet, in welchem die Primärkammer 76 und stromabwärts von der Primärkammer 76 ein Flüssigkeitssammelelement 84 angeordnet sind. In das Flüssigkeitssammelelement 84 mündet auch ein Zufuhrabschnitt 86 des Waschflüssigkeits-Filtrationsstrangs 70 zur Zufuhr von versprühter Waschflüssigkeit aus dem Waschflüssigkeits-Rezirkulationsstrang 30/40. Die Sekundärkammer 78 dient zur Aufnahme des durch das mindestens eine Mikrofiltrationselement 80 oder Ultrafiltrationselement 80 gefilterten Waschflüssigkeitsteiles, welcher ein Teilstrom des in die Primärkammer 76 strömenden Hauptstroms an Waschflüssigkeit ist. Der interne Rezirkulationskreislauf 82 enthält eine Pumpe 88 zur Zufuhr von Waschflüssigkeit aus dem Flüssigkeitssammelelement 84 in die Primärkammer 76.The cross-flow filter 74 contains at least one primary chamber 76 and at least one secondary chamber 78, which are separated from each other by at least one microfiltration element 80 or at least one ultrafiltration element 80. A portion of the scrubbing liquid filtration string 70 is formed by an internal recirculation circuit 82 for recirculating unfiltered scrubbing liquid, in which the primary chamber 76 and downstream of the primary chamber 76, a liquid collection element 84 are arranged. A feed section 86 of the scrubbing liquid filtration line 70 for supplying sprayed scrubbing liquid from the scrubbing liquid recirculation line 30/40 also opens into the liquid collecting element 84. The secondary chamber 78 serves to receive the washing liquid part filtered by the at least one microfiltration element 80 or ultrafiltration element 80, which is a partial flow of the main flow of washing liquid flowing into the primary chamber 76. The internal recirculation circuit 82 includes a pump 88 for supplying wash liquid from the liquid collection element 84 into the primary chamber 76.

Das Flüssigkeitssammelelement 84 ist vorzugsweise ein Sammeltank zum Aufnehmen von versprühter Waschflüssigkeit aus dem Waschflüssigkeits-Rezirkulationsstrang 30/40 der mindestens einen Waschzone 8 und zum Aufnehmen von Waschflüssigkeit, welche aus der Primärkammer 76 in den Sammeltank 84 zurückgeführt wird.The liquid collection element 84 is preferably a collection tank for receiving sprayed wash liquid from the wash liquid recirculation strand 30/40 of the at least one wash zone 8 and for receiving wash liquid which is returned from the primary chamber 76 to the collection tank 84.

Der Sammeltank 84 ist vorzugsweise zum Sammeln von Schmutz ausgebildet und mit einem Schmutzauslass 90 zum Abführen von Schmutz aus der Waschflüssigkeit versehen.The collection tank 84 is preferably designed to collect dirt and provided with a dirt outlet 90 for removing debris from the washing liquid.

Claims (5)

  1. Conveyor dishwasher in the form of a flight-type dishwasher or a rack conveyor dishwasher, comprising
    - at least one wash zone (6, 8) which has wash nozzles (20, 22, 24, 26) for wash liquid and which is provided with a wash liquid recirculation section (28/38, 30/40) which has a wash tank (28, 30) for collecting at least a portion of the sprayed wash liquid and a wash liquid supply line (38, 40) having a pump (34, 36) for supplying wash liquid from the wash tank (28, 30) to the wash nozzles (20, 22, 24, 26);
    - a final rinse zone (14) having final rinse nozzles (42, 44) for final rinse liquid; and
    - a conveyor apparatus (2) for conveying washware through the zones (6, 8, 14), with the conveying direction (4) of the conveyor apparatus (2) being directed from the at least one wash zone (6, 8) to the final rinse zone (14);
    characterized in that
    a wash liquid filtration section (70) is provided for the at least one wash zone (6, 8) for the purpose of removing and then filtering sprayed wash liquid from the wash liquid recirculation section (28/38, 30/40) and for the purpose of returning filtered wash liquid to the wash liquid recirculation section (28/38, 30/40), with the wash liquid filtration section (70) having a micro- or ultra-filtration device (72) for filtering sprayed wash liquid, with the micro- or ultra-filtration device (72) having a cross-flow filter (74) with at least one primary chamber (76) and at least one secondary chamber (78) which are separated by at least one micro- or ultra-filtration element (80); and with the micro- or ultra-filtration device (72) having a liquid collection element (84), into which a supply sector (86) of the wash liquid filtration section (70) for supplying sprayed wash liquid from the wash liquid recirculation section (30/40) issues, and a pump (88) for the purpose of supplying wash liquid from the liquid collection element (84) to the primary chamber (76).
  2. Conveyor dishwasher according to Claim 1,
    with the wash liquid filtration section (70) being in the form of a filtration circuit in which the wash tank (28, 30) of the wash liquid recirculation section (28/38, 30/40) is integrated, so that wash liquid flows from the wash tank (28, 30) into the wash liquid filtration section (70) and, after the wash liquid is filtered, the filtered wash liquid portion flows back into the wash tank (28, 30) again.
  3. Conveyor dishwasher according to Claim 1 or 2,
    with a sector of the wash liquid filtration section (70) being formed by an internal recirculation circuit (82) for recirculating unfiltered wash liquid,
    with the primary chamber (76) and, downstream of the primary chamber (76), the liquid collection element (84) being arranged in the internal recirculation circuit, and
    with the at lea.st one secondary chamber (78) being designed for the purpose of accommodating that portion of the wash liquid which is filtered by the at least one micro-filtration element (80) or ultra-filtration element (80), the said portion of wash liquid being a substream of the main stream of wash liquid flowing into the primary chamber (76).
  4. Conveyor dishwasher according to one of the preceding claims,
    with the liquid collection element (84) being a collection tank for accommodating sprayed wash liquid from the wash liquid recirculation section (28/38, 30/40) of the at least one wash zone (6, 8) and wash liquid which is recirculated from the primary chamber (76).
  5. Conveyor dishwasher according to Claim 4,
    with the collection tank (84) having a dirt outlet (90) for discharging dirt from the wash liquid.
EP06012920A 2005-08-12 2006-06-23 Transport-type dishwasher with means for reducing dirtiness of the washing fluid Ceased EP1752080B1 (en)

Applications Claiming Priority (1)

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DE102005038433A DE102005038433A1 (en) 2005-08-12 2005-08-12 Transport dishwasher

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EP1752080A2 EP1752080A2 (en) 2007-02-14
EP1752080A3 EP1752080A3 (en) 2007-11-07
EP1752080B1 true EP1752080B1 (en) 2010-10-20

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EP (1) EP1752080B1 (en)
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Also Published As

Publication number Publication date
DE502006008118D1 (en) 2010-12-02
EP1752080A2 (en) 2007-02-14
DE102005038433A1 (en) 2007-02-15
CA2555143C (en) 2010-02-02
CA2555143A1 (en) 2007-02-12
EP1752080A3 (en) 2007-11-07
US20070034240A1 (en) 2007-02-15

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