EP0547011B1 - Waschprozess für einen industriellen Geschirrspüler - Google Patents

Waschprozess für einen industriellen Geschirrspüler Download PDF

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Publication number
EP0547011B1
EP0547011B1 EP92830661A EP92830661A EP0547011B1 EP 0547011 B1 EP0547011 B1 EP 0547011B1 EP 92830661 A EP92830661 A EP 92830661A EP 92830661 A EP92830661 A EP 92830661A EP 0547011 B1 EP0547011 B1 EP 0547011B1
Authority
EP
European Patent Office
Prior art keywords
washing
water
detergent
rinsing
detergent liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92830661A
Other languages
English (en)
French (fr)
Other versions
EP0547011A1 (de
Inventor
Liano Maffei
Elio Lippi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Premark International Holdings BV
Original Assignee
COLGED Srl
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Filing date
Publication date
Application filed by COLGED Srl filed Critical COLGED Srl
Publication of EP0547011A1 publication Critical patent/EP0547011A1/de
Application granted granted Critical
Publication of EP0547011B1 publication Critical patent/EP0547011B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • 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
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms

Definitions

  • the present invention relates to a washing method for dishwashing machines of industrial type, in particular for bars, restaurants and cafeterias.
  • the dishwashing machines for bars, restaurants and cafeterias presently on the market comprise a tank containing washing liquid circulated by a motor-driven pump which sprays said liquid under pressure at the dishes at a temperature between 50 and 60°C.
  • the washing liquid formed by water and detergent, with the residues removed from the dishes falls after each spraying into the tank and is recirculated by means of the pump until the end of the washing cycle, usually lasting 60 to 180 seconds, when the washing liquid is partially renewed with about 3 lt of clean water from the rinsing which takes place at a temperature of about 80-90°C by means of an independent circuit and for a duration of about 10-20 seconds.
  • dishwashing machines though widely used and efficient, have, from a hygienic point of view, the serious inconvenience of using a washing liquid which becomes continually more polluted with food residues, full of bacteria and other pathogenic agents, with each new cycle in which they are reused.
  • the about 3 lt of clean water added for each rinsing are absolutely not sufficient to keep the washing liquid under a certain level of pollution as the number of cycles increases.
  • small dishwashing machines have been proposed with a washing circuit independent from the rinsing circuit in which the washing liquid is completely discharged at the end of each cycle and replaced with the rinsing water which, after its make-up if any, is used for the subsequent washing.
  • small washing machines for glasses and cups operating according to this principle have been realized by the same applicant, for instance for bars, having a small pump with jets of water shooting only upwards and able to wash with only 3-4 lt of water.
  • Dishwashing machines operating in this way have not however been realized since they have the considerable limitation of requiring for each cycle a great amount of water for a satisfactory operation of the pump and to allow the spraying of the dishes from several directions to assure a good washing. It would therefore be uneconomical, even though more hygienic, to renew all the washing water at each cycle since the consumption of energy would become too great and the power that would have to be installed would be considerably higher than that of normal dishwashers and incompatible with the normally available electric power supply.
  • a system for maintaining at a low level the water consumption is disclosed in FR-A-2443231, where a dishwashing machine of the single circuit type is described.
  • the washing circuit in correspondence to the branching between upper and lower spraying means, is provided with a distributing valve that conveys the detergent liquid flow alternatively toward the lower and the upper spraying means respectively.
  • the object of the present invention is to provide a washing method for a dishwashing machine of industrial type, in particular for restaurants and cafeterias, which requires a small amount of washing water and therefore makes the replacement of all the washing liquid at the end of each cycle inexpensive while providing evident gains in terms of hygiene. All of this without lowering noticeably the performance of the machine in terms of time and detergent efficiency as compared to a conventional dishwasher.
  • a dishwashing machine comprises a washing chamber 1 in which there is housed a dish rack 2 resting above a collecting tank 3 of the detergent liquid or of the rinse water, a circulation pump 4 of the detergent liquid connected to a first circuit 5 which branches into lower 6 and upper 7 suppliers having respectively a battery of lower 6a and upper 7a sprayers.
  • the rinsing is assured by a second circuit 8 connected in 9 to a water supply network either directly or through a motor-driven pump not shown and comprising a solenoid valve 10 which sends the water to a heater 11 comprising a heating element 11a and connected to a battery of sprayers 12 for rinsing.
  • a bypass 8a crossing a solenoid valve 10a puts the supply network, connected at 9 to the machine, in direct communication with the sprayers 12 excluding the heater 11 when a pre-rinsing of the dishes with unheated water is requested.
  • a resistor 13 is provided for the heat control of the washing liquid, a filter 3a for the filtering out of solid residues and, below, a discharge pump 14 for the elimination of the dirtied washing liquid before the rinsing.
  • a three-way distributing valve 15 is provided for with a clapet 15a operated by a hydraulic plunger 16 controlled by a solenoid valve not shown.
  • a solenoid valve not shown.
  • mechanical or electromechanical operation can be provided for.
  • the washing cycle which results from the method according to the invention is completed in time T.
  • detergent liquid is sprayed, for example, upwards against the dishes for a time T1.
  • the flow of the detergent liquid is then inverted to spray downward for a time T2 at the end of which the discharge of the detergent liquid polluted with residues removed from the dishes in time T4 is carried out.
  • the second circuit which carries out the rinsing in time T6 is opened.
  • a subsequent washing can begin repeating the cycle for a time T which begins with a washing from below after the inversion in time T3 of the flow of the detergent liquid towards the lower sprayers 6a.
  • the detergent liquid for the subsequent washing is obtained from the rinse water, supplied in time T6, to which detergent is added as well as, possibly at a later point, water taken from the supply network, which can be cold network water or, if available, water preheated to about 50°C, in order to reach the minimum quantity of detergent liquid necessary for the washing.
  • the sequence of washing just illustrated wherein the spraying upwards precedes that of downwards, can be inverted, just as more than one downward or upward spraying can be repeated in sequence in a single washing cycle.
  • the relationship between the duration of the upwards and downwards washings can also vary as a function of the type of dish to be washed. In particular for cups and glasses an upwards washing lasting longer than that necessary for plates is more efficient.
  • the suppliers 6 through the sprayers 6a spray water upwards for a time T1 due to the raised position of the clapet 15a of the valve 15.
  • the plunger 16 which, hydraulically controlled in time T3, keeps the clapet 15a raised.
  • the clapet 15a is lowered by the force of gravity inverting the flow of the detergent liquid which, conveyed through the circuit 5 as well as through the suppliers 7 and the sprayers 7a at the resumption of the operation of the pump 4 itself, is sprayed downwards for a time T2.
  • the pump 4 stops and the pump 14 precedes with the discharge of the detergent liquid contained in the tank 3 and polluted by food residues from the washing.
  • the plunger 16 can also withdraw at the end of time T3, since the water which arrives under pressure from the pump 4 keeps the clapet 15a raised likewise allowing the downward spraying until the pause T5.
  • a pre-rinse can be executed with water taken directly from the supply network through a bypass 8a following the opening of the solenoid valve 10a which is followed by the actual rinsing, already described, with water heated to between 80 and 90°C.
  • the rinsing begins by means of the suppliers 12 to which very hot water arrives after passing through the heater 11.
  • the rinse water again fills the tank 3 and, along with the detergent and any water to be added in order to arrive at the minimum quantity (about 6 lt), is used for forming the detergent liquid for the subsequent cycle which begins with the lifting of the clapet 15a and the starting of the pump 4.
  • the water is maintained at a temperature of about 55° by the resistor 13 in the tank 3.
  • the water in the heater 11 (normally 5 to 6 lt) is brought to rinsing temperature during the washing and then partially replaced with water coming from the network at the rinsing.
  • the washing alternated between upwards and downwards, allows the reduction by about 50% of the volume of wash water necessary with the possibility of renewing at each washing cycle the detergent liquid present in the tank 3.
  • the washing time is not doubled with respect to a cycle carried out by a traditional dishwashing machine since during the washing with the lower sprayers the detergent liquid hits the dishes from below and then falls under the force of gravity towards the tank 3 allowing the more resistent residues present on the dishes to soften before then finally being removed by the upper sprayers during the downward spraying.
  • the washing is thus accomplished with a detergent liquid which is always clean assuring the maximum hygiene without requiring a great increase in the amount of energy used with respect to a traditional dishwashing machine thus making the invention very competitive on the market.
  • the rinsing step can be alternated utilizing a three-way valve positioned on the rinsing duct 8 in correspondence with the branching at the two groups of sprayers 12, in order to rinse the dishes with jets coming from below and then from above. Even lengthening the rinsing time by about 15 seconds, this way of operating proves advantageous in all cases in which the machine must be installed in an electrical power network of low capacity, insufficient to run the upper and lower sprayers contemporaneously. It also proves advantageous when an autonomous pump is provided for the rinsing circuit; in this case energy consumption is decreased as a result of the decreased total quantity of rinse water used.
  • the procedure according to the invention can be advantageously expanded also to traditional dishwashers in that it allows the use of a lower power pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)

Claims (4)

  1. Waschprozeß für einen industriell einsetzbaren Geschirrspüler, wie er insbesondere in Restaurants und Cafeterias eingesetzt wird, mit folgenden Verfahrensschritten:
    - Waschen des Geschirrs mit Düsenstrahlen aus Spülflüssigkeit, die heißes Wasser und zugesetztes Spülmittel aufweist und in einem ersten Kreislauf (5) zirkuliert;
    - Klarspülen des Geschirrs mittels Düsenstrahlen aus Klarspülwasser, das aus einem Wassernetz bezogen und erhitzt wird, sowie mittels eines zweiten Kreislaufs (8) gefördert und versprüht wird;
    - wobei der Verfahrensschritt des Waschens zumindest einen Teilschritt einschließt, in dem die Spülflüssigkeit ausschließlich nach oben gerichtet versprüht wird und zumindest einen Teilschritt, in dem die Spülflüssigkeit ausschließlich nach unten gerichtet versprüht wird;
    dadurch gekennzeichnet, daß am Ende des Verfahrensschrittes des Waschens des Geschirrs die gesamte Spülflüssigkeit einschließlich der vom Geschirr abgewaschenen Verunreinigungen abgeführt und durch klares, heißes Klarspülwasser ersetzt wird, das, nach dem Hinzufügen von Spülmittel, die Spülflüssigkeit für den nächstfolgenden Schritt des Waschens des Geschirrs bildet.
  2. Waschprozeß nach Anspruch 1, bei dem Aufbereitungswasser dem Klarspülwasser hinzugefügt wird, wobei das Aufbereitungswasser aus dem Wassernetz entnommen wird, um zusammen mit dem Spülmittel, die Spülflüssigkeit für den nächstfolgenden Schritt des Waschens des Geschirrs zu bilden.
  3. Waschprozeß nach Anspruch 2, bei dem das dem Klarspülwasser zuzusetzende Aufbereitungswasser zugesetzt wird, ehe dieses zum Vorwaschen des Geschirrs benutzt wird.
  4. Waschprozeß nach den vorhergehenden Ansprüchen, bei dem auch der Teilschritt des Klarspülens des Geschirrs in zumindest einem Teilschritt erfolgt, in dem das Klarspülwasser ausschließlich nach oben gerichtet zugeführt wird und in zumindest einem Teilschritt, in dem das Klarspülwasser ausschließlich nach unten gerichtet zugeführt wird.
EP92830661A 1991-12-11 1992-12-10 Waschprozess für einen industriellen Geschirrspüler Expired - Lifetime EP0547011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI910293A IT1252886B (it) 1991-12-11 1991-12-11 Procedimento di lavaggio per una macchina lavastoviglie di tipo industriale e macchina lavastoviglie relativa
ITFI910293 1991-12-11

Publications (2)

Publication Number Publication Date
EP0547011A1 EP0547011A1 (de) 1993-06-16
EP0547011B1 true EP0547011B1 (de) 1997-02-26

Family

ID=11349861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830661A Expired - Lifetime EP0547011B1 (de) 1991-12-11 1992-12-10 Waschprozess für einen industriellen Geschirrspüler

Country Status (4)

Country Link
EP (1) EP0547011B1 (de)
DE (1) DE69217629T2 (de)
ES (1) ES2100330T3 (de)
IT (1) IT1252886B (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404369C2 (de) * 1994-02-11 1997-04-30 Miele & Cie Zulaufventil für den Sprüharm einer Geschirrspülmaschine
FR2717670A1 (fr) * 1994-03-25 1995-09-29 Beauchamp Bruno Dispositif de trempage et de rincage pour lave vaisselle.
DE19546966C2 (de) * 1995-12-15 2001-04-19 Bsh Bosch Siemens Hausgeraete Haushalt-Geschirrspülmaschine
IT1282071B1 (it) * 1996-01-26 1998-03-09 Candy Spa Dispositivo di deviazione e intercettazione di flusso di irrorazione per macchina lavastoglie lavatrice in genere e relativa macchina
ATE271346T1 (de) * 1998-10-16 2004-08-15 Arcelik As Geschirrspülmaschine mit unabhängig gesprizten geschirrkörben
DE19857103A1 (de) * 1998-12-10 2000-06-15 Bsh Bosch Siemens Hausgeraete Haushalt-Geschirrspülmaschine
DE19907188A1 (de) * 1999-02-19 2000-08-24 Bsh Bosch Siemens Hausgeraete Haushalt-Geschirrspülmaschine
ITMI20010238A1 (it) * 2001-02-07 2002-08-07 T & P Spa Valvola deviatrice per macchina di lavaggio e relativi metodi di applicazione
ITTO20010943A1 (it) * 2001-10-05 2003-04-05 Elbi Int Spa Gruppo valvolare di deviazione, particolarmente per una macchina lava-asciuga-stoviglie.
DE10163196A1 (de) * 2001-12-21 2003-07-03 Bsh Bosch Siemens Hausgeraete Spülverfahren für Geschirrspülmaschinen und Geschirrspülmaschinen
ATE417540T1 (de) * 2006-09-27 2009-01-15 Bonferraro Spa Gewerbliche geschirrspülmaschine mit verbessertem kreislauf zur wasserenthärtung
DE602007001244D1 (de) * 2007-09-28 2009-07-16 Bonferraro Spa Verfahren zum Betreiben eines gewerblichen Geschirrspülers
DE102017218353A1 (de) * 2017-10-13 2019-04-18 BSH Hausgeräte GmbH Ventilvorrichtung zum Leiten eines Kondensats eines Wäschepflegegerätes
EP4309561A1 (de) * 2022-07-22 2024-01-24 Aweco Polska Appliance Sp. z o.o. sp. k Haushaltsgeräte mit einer flüssigkeitsverteilereinheit

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE915026C (de) * 1950-05-03 1954-07-15 Stierlen Werke Ag Einrichtung zur Automatisierung einer periodisch arbeitenden Geschirrspuelmaschine
DE2615846A1 (de) * 1976-04-10 1977-10-20 Miele & Cie Wasch- oder spuelverfahren fuer wasch- oder geschirrspuelmaschinen
FR2443231A2 (fr) * 1978-12-08 1980-07-04 Esswein Sa Procede de lavage de la vaisselle, systeme de mise en oeuvre de ce procede, et machine a laver la vaisselle munie d'un tel systeme
DE2911005A1 (de) * 1979-03-21 1980-09-25 Licentia Gmbh Verfahren zum reinigen von geschirr in einer haushaltgeschirrspuelmaschine und haushaltgeschirrspuelmaschine zur durchfuehrung des verfahrens
DE3014663C2 (de) * 1980-04-16 1983-11-17 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Haushalt-Geschirrspülmaschine
US4641671A (en) * 1984-02-20 1987-02-10 Daikin Industries Ltd. Automatic dishwasher
FR2564310B1 (fr) * 1984-05-18 1988-02-26 Blanc Remi Machine a laver la vaisselle
US4810306A (en) * 1986-02-26 1989-03-07 The Stero Company Low energy, low water consumption warewasher and method
IT1191526B (it) * 1986-03-19 1988-03-23 Zanussi Elettrodomestici Macchina lavatrice con valvola di distribuzione del flusso di un liquido
JPH0675563B2 (ja) * 1989-03-03 1994-09-28 ホシザキ電機株式会社 食器洗浄機のための制御装置

Also Published As

Publication number Publication date
IT1252886B (it) 1995-07-04
ES2100330T3 (es) 1997-06-16
ITFI910293A1 (it) 1993-06-11
DE69217629T2 (de) 1997-10-02
ITFI910293A0 (it) 1991-12-11
EP0547011A1 (de) 1993-06-16
DE69217629D1 (de) 1997-04-03

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