EP2623013B1 - Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe - Google Patents

Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe Download PDF

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Publication number
EP2623013B1
EP2623013B1 EP12425021.8A EP12425021A EP2623013B1 EP 2623013 B1 EP2623013 B1 EP 2623013B1 EP 12425021 A EP12425021 A EP 12425021A EP 2623013 B1 EP2623013 B1 EP 2623013B1
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EP
European Patent Office
Prior art keywords
softener
water
sodium chloride
inlet valve
chloride solution
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
EP12425021.8A
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German (de)
English (en)
Other versions
EP2623013A1 (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 PL12425021T priority Critical patent/PL2623013T3/pl
Priority to EP12425021.8A priority patent/EP2623013B1/fr
Publication of EP2623013A1 publication Critical patent/EP2623013A1/fr
Application granted granted Critical
Publication of EP2623013B1 publication Critical patent/EP2623013B1/fr
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4229—Water softening arrangements
    • 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
    • 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

Definitions

  • the present invention relates to industrial dishwashers, and in particular to a dishwasher with an improved water softening circuit and a relevant operating method.
  • 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.
  • 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 resin regeneration step requires a minimum time of at least 6-7 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 valve of the bypass pipe is opened first to empty the expansion chamber through the bypass pipe and the sump, and immediately thereafter the valve allowing the water in the salt container is opened so that the softener is filled with sodium chloride solution until the latter overflows into the break tank and partially fills also the expansion chamber (the bypass valve having been closed in the meantime).
  • the bypass valve and the network water inlet valve are opened so that the network water washes the resins and reaches the expansion chamber without ever completely filling it, thanks to a proper management of the opening times of the valves and of the flow rates.
  • the sodium chloride solution is therefore conveyed to the sump, bypassing the heater, from where it is discharged by the drain pump which is also activated for periods proportional to the amount of entered resin wash water.
  • the shape and size of the sump are important to guarantee that the sodium chloride solution is fully drained by the drain pump.
  • the suction mouth of the drain pump is located at the bottom of the sump to assure a complete discharge of the sodium chloride solution that due to a specific weight greater than water tends to accumulate in the bottom portion of the sump.
  • the volume of the sump is equal to or greater than the volume of the regeneration water, which in turn must be at least equal to the resin volume.
  • 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 provided with a deviating valve that allows to connect the softener directly to the drain, through a pipe bypassing the break tank, and provided with a secondary inlet valve connected directly to the break tank through a pipe bypassing the softener.
  • a deviating valve that allows to connect the softener directly to the drain, through a pipe bypassing the break tank, and provided with a secondary inlet valve connected directly to the break tank through a pipe bypassing the softener.
  • 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, retaining all the advantages of the above-described prior art arrangement yet without any interference with the wash cycle and without any limitation in the number of wash cycles carried out during the regeneration of the resins. Moreover, this overlapping of the wash and regeneration operations is easier to implement as to the management of the opening times of the valves and of the operating times of the pumps.
  • a further advantage of this dishwasher stems from the fact that it uses a standard break tank without expansion chamber and enlarged accumulation chamber, which is therefore smaller and cheaper to manufacture.
  • Still another advantage of the present dishwasher resides in the total independence of the sump volume from the resin volume whereby said constructional features can be optimized each according to its own needs.
  • the sump might be smaller to reduce the amount of water required for a wash cycle while the softener might be larger to increase the number of wash cycles that can be carried out between two regeneration steps.
  • an industrial dishwasher conventionally includes a first network water inlet valve EV1 that controls the flow from a tap 1 to a softener 2, containing decalcifying resins, through which the water reaches a break tank 3 first and from there a heater 4.
  • a rinse pump 5 takes the heated water from heater 4 and sends it to the rinse sprinklers 6 that spray it into tank 7.
  • the water is then collected in sump 8 at the bottom of tank 7 and used also in the subsequent wash steps by means of a wash pump 9 that feeds relevant wash sprinklers 10, while a portion thereof is discharged through a drain pipe 11 by means of a drain pump 12.
  • a second network water inlet valve EV2 that controls the flow from tap 1 to a salt container 13 ( Fig.2 ), to obtain the sodium chloride solution that reaches then softener 2 where it combines with the resins to clean them from the calcium and magnesium salts.
  • a first novel aspect of the present dishwasher is the presence of a deviating valve 14 located between softener 2 and break tank 3, said valve 14 being able to direct the water flow coming from softener 2 towards break tank 3, through a first outlet A ( Fig. 1 ), or directly towards the drain pipe 11 through a second outlet B ( Figs.2-3 ) and a first bypass pipe BP1 that bypasses break tank 3.
  • a second novel aspect of this dishwasher is the presence of a third network water inlet valve EV3 that controls the flow from tap 1 directly to break tank 3 through a second bypass pipe BP2 that bypasses softener 2 ( Figs.2-3 ).
  • the hydraulic circuit of the dishwasher can be divided into a water softening circuit and a wash circuit that are completely independent during the resin regeneration step.
  • valve EV1 When the resin regeneration phase is started ( Fig.2 ) the hydraulic circuit of the dishwasher is divided as mentioned above by closing valve EV1 and opening valve EV2, so that the water flow passes through the salt container 13 and softener 2 is filled with sodium chloride solution, and valve EV3 so that the unsoftened network water reaches break tank 3, through bypass pipe BP2, and then heater 4.
  • valve 14 is switched from outlet A to outlet B so as to connect softener 2 directly with drain 11 through bypass pipe BP1, whereby the possible sodium chloride solution in excess overflowing from softener 2 does not reach break tank 3.
  • 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.
  • the first inlet valve EV1 is re-opened, the second inlet valve EV2 having been closed upon loading the sodium chloride solution in softener 2, whereby the network water washes the resins in softener 2 and the sodium chloride solution (together with the resin wash water) is directly drained through pipe BP1 bypassing break tank 3, since the deviating valve 14 is still connected to the drain pipe 11.
  • the third inlet valve EV3 is closed and the deviating valve 14 is switched from outlet B to outlet A thus restoring the normal operating condition illustrated in Fig.1 with the two parts of the hydraulic circuit mutually connected.
  • a dishwasher according to the present invention can carry out a wash cycle simultaneously with and completely independently of the resin regeneration step.
  • the wash pump 9 and the rinse pump 5 take water respectively from sump 8 and heater 4, possibly integrated with network water coming directly from the second bypass pipe BP2
  • the resin regeneration only affects softener 2 and the deviating valve 14 that directs the sodium chloride solution and the resin wash water directly to drain 11 through the first bypass pipe BP1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Claims (3)

  1. Lave-vaisselle industriel comprenant un adoucisseur (2) à résines décalcifiantes à travers lequel l'eau venant du réseau (1) par une première valve d'entrée (EV1) atteint un collecteur (3) et à partir de là, un dispositif de chauffage (4) qui alimente des gicleurs de rinçage (6) au moyen d'une pompe de rinçage (5), ainsi qu'une deuxième valve d'entrée d'eau de réseau (EV2) qui régule l'écoulement de l'eau vers un récipient de sel (13) pour obtenir une solution de chlorure de sodium qui atteint ensuite ledit adoucisseur (2), caractérisé en ce qu'il comprend en outre une valve de déviation (14) positionnée entre l'adoucisseur (2) et ledit collecteur (3), appropriée pour diriger l'écoulement d'eau provenant de l'adoucisseur (2) vers le collecteur (3) par une première sortie (A) ou directement vers un tuyau de vidange (11) du lave-vaisselle par une seconde sortie (B) et un premier tuyau de dérivation (BP1) qui contourne le collecteur (3) ainsi qu'une troisième valve d'entrée d'eau de réseau (EV3) qui régule l'écoulement de l'eau du réseau (1) directement vers le collecteur (3) par un second tuyau de dérivation (BP2) qui contourne l'adoucisseur (2).
  2. Procédé pour la régénération des résines décalcifiantes de l'adoucisseur (2) d'un lave-vaisselle industriel selon la revendication précédente, caractérisé en ce qu'il comprend les étapes suivantes consistant à :
    a) ouvrir la troisième valve d'entrée (EV3) qui régule l'écoulement entrant de l'eau de réseau directement dans le collecteur (3) par le second tuyau de dérivation (BP2) ;
    b) fermer la première valve d'entrée (EV1) qui régule l'écoulement entrant de l'eau de réseau dans l'adoucisseur (2) ;
    c) ouvrir la deuxième valve d'entrée (EV2) qui régule l'écoulement entrant de l'eau de réseau dans le récipient de sel (13) afin d'obtenir une solution de chlorure de sodium à amener à l'adoucisseur (2) ;
    d) faire passer la valve de déviation (14) de la première sortie (A) à la seconde sortie (B) afin de raccorder l'adoucisseur (2) directement au tuyau de vidange (11) par le premier tuyau de dérivation (BP1) ;
    e) fermer la deuxième valve d'entrée (EV2) après que la solution de chlorure de sodium a complètement remplie l'adoucisseur (2) ;
    f) attendre pendant une période de contact appropriée entre la solution de chlorure de sodium et les résines décalcifiantes ;
    g) ouvrir la première valve d'entrée (EV1) qui régule l'écoulement entrant de l'eau de réseau dans l'adoucisseur (2) pour emporter la solution de chlorure de sodium des résines ;
    h) vidanger la solution de chlorure de sodium et l'eau de lavage de résine par le premier tuyau de dérivation (BP1) et le tuyau de vidange (11) ;
    i) faire passer la valve de déviation (14) de la seconde sortie (B) à la première sortie (A) afin de raccorder l'adoucisseur (2) au collecteur (3) ;
    j) fermer la troisième valve d'entrée (EV3).
  3. Procédé selon la revendication précédente, caractérisé en ce qu'une ou plusieurs des étapes b) à i) sont réalisées pendant un ou plusieurs cycles de lavage.
EP12425021.8A 2012-02-02 2012-02-02 Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe Active EP2623013B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL12425021T PL2623013T3 (pl) 2012-02-02 2012-02-02 Przemysłowa zmywarka do naczyń z udoskonalonym obwodem do zmiękczania wody i odpowiednim sposobem obsługi
EP12425021.8A EP2623013B1 (fr) 2012-02-02 2012-02-02 Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12425021.8A EP2623013B1 (fr) 2012-02-02 2012-02-02 Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe

Publications (2)

Publication Number Publication Date
EP2623013A1 EP2623013A1 (fr) 2013-08-07
EP2623013B1 true EP2623013B1 (fr) 2014-03-26

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EP12425021.8A Active EP2623013B1 (fr) 2012-02-02 2012-02-02 Lave-vaisselle industriel avec un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associe

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EP (1) EP2623013B1 (fr)
PL (1) PL2623013T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6105683B2 (ja) 2014-07-21 2017-03-29 エルジー エレクトロニクス インコーポレイティド 食器洗い機
CN107928590A (zh) * 2017-11-24 2018-04-20 佛山市顺德区美的洗涤电器制造有限公司 洗碗机
CN110693432B (zh) * 2018-07-09 2023-04-18 青岛海尔洗碗机有限公司 一种洗碗机的软化装置、控制方法及洗碗机
IT201800007257A1 (it) * 2018-07-17 2018-10-17 Dispositivo distributore di acqua per un elettrodomestico di lavaggio.
EP3662807A1 (fr) 2018-12-05 2020-06-10 MELAG Medizintechnik GmbH & Co. KG Lave-vaisselle commandé par programme et son procédé de fonctionnement
EP3666153B1 (fr) * 2018-12-12 2021-09-08 Bonferraro S.p.A. Lave-vaisselle industriel comportant un circuit adoucisseur d'eau amélioré et procédé de fonctionnement associé

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1728233A1 (de) * 1968-09-14 1972-03-23 Bosch Hausgeraete Gmbh Geschirrspuelmaschine
DE3527047A1 (de) * 1985-07-27 1987-02-05 Licentia Gmbh Programmgesteuerte wasch- oder geschirrspuelmaschine
DE19903635A1 (de) * 1999-01-29 2000-08-10 Premark Feg Llc Kleinenthärter für Geschirrspülmaschine
ITPN20030014A1 (it) * 2003-02-26 2004-08-27 Electrolux Ab Macchina lavastoviglie automatica per collettivita' con
ATE417540T1 (de) 2006-09-27 2009-01-15 Bonferraro Spa Gewerbliche geschirrspülmaschine mit verbessertem kreislauf zur wasserenthärtung

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PL2623013T3 (pl) 2014-08-29
EP2623013A1 (fr) 2013-08-07

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