EP1905339B1 - Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré - Google Patents

Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré Download PDF

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Publication number
EP1905339B1
EP1905339B1 EP06425662A EP06425662A EP1905339B1 EP 1905339 B1 EP1905339 B1 EP 1905339B1 EP 06425662 A EP06425662 A EP 06425662A EP 06425662 A EP06425662 A EP 06425662A EP 1905339 B1 EP1905339 B1 EP 1905339B1
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EP
European Patent Office
Prior art keywords
tank
heater
water
softener
wash
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.)
Active
Application number
EP06425662A
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German (de)
English (en)
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EP1905339A1 (fr
Inventor
Ezio Gobbi
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.)
Bonferraro SpA
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Bonferraro SpA
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Publication date
Application filed by Bonferraro SpA filed Critical Bonferraro SpA
Priority to AT06425662T priority Critical patent/ATE417540T1/de
Priority to DE602006004346T priority patent/DE602006004346D1/de
Priority to PL06425662T priority patent/PL1905339T3/pl
Priority to EP06425662A priority patent/EP1905339B1/fr
Priority to ES06425662T priority patent/ES2317481T3/es
Publication of EP1905339A1 publication Critical patent/EP1905339A1/fr
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Publication of EP1905339B1 publication Critical patent/EP1905339B1/fr
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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
    • A47L15/42—Details
    • A47L15/4229—Water softening arrangements

Definitions

  • the present invention relates to industrial dishwashers, and in particular to a dishwasher with an improved water softening circuit.
  • EP 1 462 050 A One said industrial dishwasher is disclosed in EP 1 462 050 A .
  • Said circuits are different from those of domestic dishwashers in various respects, in particular in the presence of two distinct wash and rinse circuits each having its own sprinklers.
  • the wash water is sprayed onto the dishes by a wash pump and during the rinse a portion of this water is replaced by rinse water pre-heated in a heater and fed to the rinse circuit by a suitable rinse pump.
  • the water coming from the network passes through the softener and reaches a break tank, connected to the wash tank, from where it is fed to the heater, the level inside the latter being controlled through a pressure switch connected to an air trap in communication with the heater through a suitable duct.
  • a brightener dosing pump is also connected to said duct, and a heater vent is in turn connected to said break tank.
  • An aspect in common with domestic dishwashers is the water softening process carried out by means of decalcifying resins that remove from the water the calcium and magnesium salts contained therein. These resins have to be periodically regenerated by means of a sodium chloride solution and the regeneration step requires a minimum time of at least 7 minutes, so that the sodium chloride solution is combined by ion exchange with the calcium and magnesium salts present on the resins thus removing them.
  • the object of the present invention is to provide an industrial dishwasher which overcomes said drawbacks.
  • This object is achieved by means of an industrial dishwasher in which the break tank is provided with an expansion chamber interposed between the inlet of the water coming from the softener and the outlet to the heater, said expansion chamber being provided with an outlet that connects it directly to the tank sump through a pipe that bypasses the heater, the flow through said bypass pipe being controlled by a suitable valve.
  • the main advantage of the dishwasher according to the present invention is that it can carry out the regeneration of the resins simultaneously with a wash cycle, without having to resort to pause periods or to complicated double water treatment circuits, whereby the regeneration is carried out only when required and without significantly affecting the exploitation of the machine. This results also in lower water and salt consumptions and better wash results, as well as lower manufacturing cost with respect to a dishwasher with double circuits.
  • a further advantage of this dishwasher stems from the integration into said break tank, in its preferred embodiment, of the pressure switch air trap and of the brightener inlet, so as to dispense with the relevant duct mounted on the heater that is therefore cheaper to manufacture.
  • an industrial dishwasher conventionally includes a first network water inlet valve 1 that controls the flow to a softener 2, containing decalcifying resins, through which the water reaches a break tank 3. From break tank 3, through a pipe L, the water is fed to a heater 4 whose filling level is controlled by a pressure switch 5, while a brightener pump 6 provides the dispensing of the brightener when required.
  • a rinse pump 7 takes the heated water from heater 4 and sends it , through a feed pipe F, to the rinse sprinklers 8 that spray it into tank 9. The water is then collected in sump 13 at the bottom of tank 9, and from there discharged through a drain pipe D by means of a drain pump 14.
  • a second network water inlet valve 10 that controls the flow to a salt container 11, to prepare the sodium chloride solution that reaches then softener 2 where it combines with the resins to clean them from the calcium and magnesium salts.
  • break tank 3 is better illustrated in detail in fig.2 .
  • the break tank 3, as mentioned above, is conventionally provided with a first inlet E1, leading to an air break X, for the water coming from softener 2 and with a first outlet U1, formed at the bottom of an accumulation chamber W, to feed water to heater 4.
  • the latter is also connected to break tank 3 through a vent pipe connected to a second inlet E2 that through a siphon S leads to an opening R connecting break tank 3 with tank 9.
  • a first novel aspect of the present break tank 3 is the presence of an expansion chamber Y arranged between the air break X and the accumulation chamber W, and provided at the bottom with a second outlet U2.
  • the water entering through the first inlet E1 reaches the air break X and first fills the expansion chamber Y; once the latter is full, the water overflows to chamber W and through outlet U1 reaches heater 4.
  • the entrance of the water to heater 4 is allowed by the fact that the air is vented to tank 9 through siphon S, connected to heater 4 through the second inlet E2.
  • heater 4 Once heater 4 is full, water builds up in chamber W compressing the air in the air trap T until the pressure switch 5 is switched. The water loading proceeds then for a preset time such as to determine the almost complete filling of the accumulation chamber W, and the possible excess water overflows to tank 9 through connection R. During the heating of the water in heater 4, the vapor created therein rises along the pipe connected to inlet E2 and reaches siphon S form where it is discharged to tank 9, always through connection R.
  • a second novel aspect of break tank 3 resides in the air trap T, used by pressure switch 5, being integrated in the structure of the break tank at the bottom of the accumulation chamber W. Furthermore, at the bottom of the latter there is also formed a third inlet E3 to which the brightener pump 6 is connected.
  • a further novel aspect of break tank 3 is that at its top, in the passage region between the expansion chamber Y and the accumulation chamber W, there is formed a vapor release path Z extending from opening R upto an opening to the outside.
  • tank 9 is provided with a vent that is useful in the heating steps when the air contained therein is dilated and allows to release vapor in a controlled manner, rather than by means of leaks through the door seal as in prior art dishwashers.
  • along the path there are arranged several fins intended to favor the condensation of vapor and to limit the speed of the outflowing stream.
  • the accumulation chamber W is advantageously made of greater size to obtain a reserve of pre-heated water to be fed to heater 4, since break tank 3 is in contact with the wall of tank 9 that heats up during the washing steps. Even in the case of extended pauses with the machine in operation, and therefore with heater 4 operating with a subsequent water evaporation, there is a continuous topping up of the level of heater 4 without having to let in water from the network thanks to the capacity of chamber W. Finally, it is possible to set "extended rinse" cycles with the same capacity of the heater by exploiting the water from chamber W as "additional amount", in that it is pre-heated.
  • Another novel aspect of the present dishwasher results from the presence of a bypass pipe B connecting outlet U2 of the expansion chamber Y to sump 13 of tank 9, bypassing heater 4.
  • the water flow in pipe B, and therefore the outflow through outlet U2 is controlled by a shut-off valve 12.
  • valve 12 When the resin regeneration phase is started valve 12 is opened first, to empty the expansion chamber Y through the bypass pipe B and sump 13, and immediately thereafter valve 10 is opened so that the water flow passes through the salt container 11 and softener 2 is filled with sodium chloride solution. Once softener 2 is full, the sodium chloride solution reaches break tank 3 through the first inlet E1 and partially fills also the expansion chamber Y (valve 12 having been closed in the meantime), and valve 10 is closed.
  • the "resin wash” is performed, i.e. the sodium chloride solution is washed away from the resins to prevent salt water from reaching the tank.
  • both valve 12 and valve 1 are opened so that the network water washes the resins and reaches the expansion chamber Y without ever completely filling it, thanks to a proper management of the times and flow rates (e.g.: 5 seconds of opening of valve 1 and 10 seconds of opening of valve 12; cycle repeated 5 times).
  • the sodium chloride solution is therefore conveyed to sump 13, bypassing heater 4, from where it is discharged by the drain pump 14, also activated for periods proportional to the amount of entered resin wash water.
  • sump 13 are important to guarantee that the sodium chloride solution is fully drained by pump 14, whose suction mouth is preferably located at the bottom of sump 13 to assure a complete discharge of the sodium chloride solution.
  • the sodium chloride solution has a specific weight greater than water the latter tends to accumulate in the top portion of the sump, therefore in addition to activating the drain pump 14 it is possibly necessary to stop the wash pump (if it is operating) to allow the stratification of the two fluids having different density.
  • the volume of sump 13 should preferably be equal to or greater than the volume of the regeneration water, which in turn must be at least equal to the resin volume.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)

Claims (10)

  1. Lave-vaisselle industriel comprenant un adoucisseur (2) à résines de décalcification à travers lequel l'eau provenant du réseau atteint un réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3), raccordé au réservoir de lavage (9) du lave-vaisselle, et par ledit réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) atteint un dispositif de chauffage (4) qui alimente les pulvérisateurs de rinçage (8) qui la pulvérisent dans ledit réservoir de lavage (9) où elle est collectée dans un puits collecteur (13) situé au fond du réservoir (9), caractérisé en ce que le réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) est doté d'une chambre d'expansion (Y) intercalée entre l'entrée (E1) de l'eau provenant de l'adoucisseur (2) et la sortie (U1) vers ledit dispositif de chauffage (4), ladite chambre d'expansion (Y) étant dotée d'une sortie (U2) qui la raccorde directement audit puits collecteur (13) du réservoir (9) par un tuyau (B) qui dérive le dispositif de chauffage (4), l'écoulement par ledit tuyau de dérivation (B) étant contrôlé par une soupape (12).
  2. Lave-vaisselle industriel selon la revendication 1, caractérisé en ce que le réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) comprend également un piège d'air (T) auquel on raccorde un commutateur de pression (5) qui contrôle le niveau de remplissage du dispositif de chauffage (4).
  3. Lave-vaisselle industriel selon la revendication 1 ou 2, caractérisé en ce que le réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) comprend également une autre entrée (E3) à laquelle on raccorde une pompe de brillance (6).
  4. Lave-vaisselle industriel selon l'une des revendications précédentes, caractérisé en ce que le réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) comprend également un passage de libération de vapeur (Z) s'étendant à partir d'une ouverture (R) qui communique avec le réservoir de lavage (9) jusqu'à une sortie vers l'extérieur.
  5. Lave-vaisselle industriel selon la revendication précédente, caractérisé en ce que le passage de libération de vapeur (Z) est doté d'une pluralité d'ailettes appropriées pour favoriser la condensation de la vapeur et pour limiter la vitesse de la vapeur sortante.
  6. Lave-vaisselle industriel selon l'une des revendications précédentes, caractérisé en ce que le réservoir avec une fonction d'interruption du circuit d'alimentation d'eau (3) comprend une chambre d'accumulation (W) dimensionnée pour servir de réserve d'eau suffisante pour alimenter le dispositif de chauffage (4) en cas d'un arrêt prolongé de la machine avec le dispositif de chauffage (4) en fonctionnement, ou dans le cas d'un cycle « de rinçage prolongé », sans nécessiter l'admission d'eau de réseau supplémentaire.
  7. Lave-vaisselle industriel selon l'une des revendications précédentes, caractérisé en ce que le volume du puits collecteur (13) est égal ou supérieur au volume des résines de décalcification contenues dans l'adoucisseur (2).
  8. Lave-vaisselle industriel selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une pompe d'évacuation (14) dont la bouche d'aspiration est située au fond du puits collecteur (13).
  9. Procédé pour régénérer les résines de décalcification de l'adoucisseur (2) d'un lave-vaisselle industriel selon l'une des revendications précédentes, caractérisé en ce qu'il comprend les étapes suivantes consistant à :
    a) ouvrir la soupape (12) qui commande l'écoulement dans le tuyau de dérivation (B) pour vider la chambre d'expansion (Y) ;
    b) ouvrir la soupape (10) qui commande l'entrée de l'eau de réseau dans un récipient de sels (11) pour obtenir une solution de chlorure de sodium à alimenter à l'adoucisseur (2) ;
    c) fermer la soupape (12) du tuyau de dérivation (B) ;
    d) fermer la soupape d'entrée (10) de l'eau de réseau après que la solution de chlorure de sodium a été complètement déversée dans l'adoucisseur (2) et partiellement déversée dans la chambre d'expansion (Y);
    e) attendre une période appropriée de contact entre la solution de chlorure de sodium et les résines de décalcification ;
    f) ouvrir la soupape (12) du tuyau de dérivation (B) et la soupape (1) qui commande l'entrée de l'eau de réseau dans l'adoucisseur (2) pour retirer la solution de chlorure de sodium des résines ;
    g) fermer les soupapes (1, 12) mentionnées à l'étape précédente et les ouvrir ensuite à nouveau, réalisant une pluralité de cycles d'ouverture/fermeture avec des durées telles que la chambre d'expansion (Y) n'est jamais complètement remplie,
    h) décharger la solution de chlorure de sodium et l'eau de lavage de résines du puits collecteur (13) au moyen d'une pompe d'évacuation (14).
  10. Procédé selon la revendication précédente, caractérisé en ce qu'une ou plusieurs des étapes a) - g) sont réalisées pendant le cycle de lavage et l'étape h) est précédée par l'arrêt de la pompe de lavage et/ou la pompe de rinçage.
EP06425662A 2006-09-27 2006-09-27 Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré Active EP1905339B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT06425662T ATE417540T1 (de) 2006-09-27 2006-09-27 Gewerbliche geschirrspülmaschine mit verbessertem kreislauf zur wasserenthärtung
DE602006004346T DE602006004346D1 (de) 2006-09-27 2006-09-27 Gewerbliche Geschirrspülmaschine mit verbessertem Kreislauf zur Wasserenthärtung
PL06425662T PL1905339T3 (pl) 2006-09-27 2006-09-27 Przemysłowa zmywarka do naczyń z usprawnionym obwodem zmiękczającym wodę
EP06425662A EP1905339B1 (fr) 2006-09-27 2006-09-27 Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré
ES06425662T ES2317481T3 (es) 2006-09-27 2006-09-27 Lavavajillas industrial con circuito de ablandamiento de agua mejorado.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425662A EP1905339B1 (fr) 2006-09-27 2006-09-27 Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré

Publications (2)

Publication Number Publication Date
EP1905339A1 EP1905339A1 (fr) 2008-04-02
EP1905339B1 true EP1905339B1 (fr) 2008-12-17

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Application Number Title Priority Date Filing Date
EP06425662A Active EP1905339B1 (fr) 2006-09-27 2006-09-27 Lave-Vaisselle industriel avec circuit adoucisseur d'eau amélioré

Country Status (5)

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EP (1) EP1905339B1 (fr)
AT (1) ATE417540T1 (fr)
DE (1) DE602006004346D1 (fr)
ES (1) ES2317481T3 (fr)
PL (1) PL1905339T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9193610B2 (en) 2011-08-10 2015-11-24 Ecolab USA, Inc. Synergistic interaction of weak cation exchange resin and magnesium oxide

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366322B1 (fr) * 2010-03-18 2015-11-04 Electrolux Home Products Corporation N.V. Procédé de régénération de résine d'adoucissant de l'eau dans un lave-vaisselle
AU2011229473B2 (en) 2010-03-18 2016-08-25 Electrolux Home Products Corporation N.V. A method for filling a wash tub of a dishwasher with water
EP2623013B1 (fr) 2012-02-02 2014-03-26 Bonferraro S.p.A. Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe
WO2015167574A1 (fr) 2014-05-02 2015-11-05 Electrolux Home Products, Inc. Procédés, systèmes et appareils de réalisation de cycle rapide dans un lave-vaisselle
CN107468192A (zh) * 2017-08-22 2017-12-15 宁波欧琳厨具有限公司 具有水软化的水槽式洗碗机
PL3666153T3 (pl) * 2018-12-12 2022-01-24 Bonferraro S.P.A. Zmywarka przemysłowa z ulepszonym obwodem zmiękczania wody i odpowiedni sposób działania

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1252886B (it) * 1991-12-11 1995-07-04 Procedimento di lavaggio per una macchina lavastoviglie di tipo industriale e macchina lavastoviglie relativa
IT1277413B1 (it) * 1995-08-02 1997-11-10 Candy Spa Dispositivo per la limitazione del vapore in uscita da una macchina lavatrice
ITUD20030070A1 (it) * 2003-03-27 2004-09-28 Dihr Spa Serbatoio di discontinuita' per un'apparecchiatura di lavaggio, quale una lavastoviglie, una lavabicchieri, una lavapiatti, una lavatrice, o simili.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9193610B2 (en) 2011-08-10 2015-11-24 Ecolab USA, Inc. Synergistic interaction of weak cation exchange resin and magnesium oxide
US9896364B2 (en) 2011-08-10 2018-02-20 Ecolab Usa Inc. Synergistic interaction of weak cation exchange resin and magnesium oxide

Also Published As

Publication number Publication date
DE602006004346D1 (de) 2009-01-29
EP1905339A1 (fr) 2008-04-02
ES2317481T3 (es) 2009-04-16
PL1905339T3 (pl) 2009-06-30
ATE417540T1 (de) 2009-01-15

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