EP1114607B1 - Procédé de commande d'un circuit hydraulique pour l'optimisation de la décalcification pour lave-vaiselle - Google Patents

Procédé de commande d'un circuit hydraulique pour l'optimisation de la décalcification pour lave-vaiselle Download PDF

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Publication number
EP1114607B1
EP1114607B1 EP00125278.2A EP00125278A EP1114607B1 EP 1114607 B1 EP1114607 B1 EP 1114607B1 EP 00125278 A EP00125278 A EP 00125278A EP 1114607 B1 EP1114607 B1 EP 1114607B1
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EP
European Patent Office
Prior art keywords
resins
decalcification
tank
hydraulic
circuit
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
EP00125278.2A
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German (de)
English (en)
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EP1114607A1 (fr
Inventor
Carlo Carli
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T&P SpA
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T&P SpA
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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

Definitions

  • the present invention provides a method of control of a perfected hydraulic circuit for optimisation of decalcification, in particular for domestic dishwashers.
  • the hydraulic circuit for decalcification of the water to be fed into the washing tub of a dishwasher comprises, as is known for example from EP 0094357 , a decalcifier formed by a tank for the ion exchange resins and a tank for the regeneration salt, and a valve controlled by a timer for feeding hard mains water to the decalcifier via a regeneration compartment.
  • the resins tank in turn has internally a lower filter and an upper filter which define an area of the tank intended to contain the ion exchange resins used for softening the washing water, a section for entrance of the hard mains water upstream of the filters and downstream of the filters a section for exit of the softened water towards the washing tub.
  • a hydraulic decalcification circuit of a domestic dishwasher for twelve place settings has to handle a feed of water of approximately 4 litres per washing phase (prewash, hot wash, first cold rinse, second cold rinse, hot rinse) and notoriously is capable of softening up to 100°F of incoming hardness using a volume of 800-900 cm 3 of resins with a flow rate of the feed valve of approximately 4 litres/minute.
  • the low values of the height/radius ratio of the area for containing the resins and the passage surface/total surface ratio of the filters contribute to defining preferential paths through the resins for the flow of water to be softened, with the result that some portions of resins are used up rapidly while others remain virtually unused.
  • EP00094357 a method for improving the efficiency of the resin regeneration with the aid of one or two regeneration stages provided during the wash cycle. Said method combines dynamic and static softening of water, with water flowing through the regenerator during the washing cycle and standing still during the drying cycle, and with a regeneration stage performed at the start of every washing or pre-washing cycle.
  • the object of the present invention is therefore that of providing a method of control of an optimised hydraulic decalcification circuit in particular for domestic dishwashers, which overcomes the disadvantages suffered by traditional hydraulic decalcification circuits.
  • one object of the present invention is that of providing a method of control of a prefected hydraulic decalcification circuit, which optimises exploitation of the ion exchange resins and consequently also consumption of the regeneration salt.
  • a hydraulic decalcification circuit is required which, compared to a traditional one, uses a smaller volume of resins, achieving the same degree of softening of the washing water.
  • Another object of the present invention is that of making the decalcification system silent and avoiding also clogging of the filters and removal of the resin from the resins tank.
  • a method of control of a perfected hydraulic decalcification circuit comprising a decalcifier formed by a tank for the ion exchange resins and a tank for the resins regeneration salt, a valve for feeding into the resins tank hard mains water intended for washing the dishes, and a pair of upper and lower filters which define an area of the resins tank for containing the resins, characterised in that the feed valve is made to operate with a flow rate between 2 litres/minute and 2.5 litres/minute, while the hydraulic decalcification circuit is perfected by setting the height of the area for containing the resins at between 120 mm and 130 mm, and the passage surface/overall surface ratio of the filters higher than 20%.
  • the feeds of washing water to the washing tub for performing a washing phase are performed dynamically, that is to say partly with the circulation pump stopped and partly with the circulation pump in motion.
  • Regeneration of the resins is divided into two parts with a brief phase of intermediate rinsing and slowly, with a flow rate equal to or below 100 cm 3 /minute, and the final rinsing of the resins is performed in two parts or with a brief feed jet before actual rinsing.
  • the optimal flow rate range for the feed valve takes account of the fact that the chemical kinetics of the ion exchange is favoured for a low flow rate of water, but experimentally we have found that an excessive reduction in the flow rate penalises exchange efficiency due to the creation of preferential flows inside the resins tank.
  • the complete operation cycle lasts approximately 50 minutes and each phase requires a feed of water of approximately 4 litres: by exploiting a dynamic feed for the washing water, wherein the first two litres of water are fed with the pump which actuates the washing nozzles at a standstill, and the remaining two litres of water with the pump already in action, it is calculated that, with the present invention, the lengthening of the time of performance of the entire washing cycle is only 3-5% compared to a traditional system operating with the same type of dynamic feed but with a flow rate of the feed valve of 4 litres/minute.
  • the present invention achieves improved performances compared to a traditional decalcification system: by using a volume of 800-900 cm 3 of virgin or newly regenerated resins, our system achieves softening of the water from 100°F to 1°F while a traditional decalcification system achieves softening of the water on average from 100°F to 4°F; in other words, in order to soften the water from 100°F to 4°F, for our system a volume of 600 cm 3 of resins is sufficient.
  • the decalcification system of the present invention is suitable for being used also for softening extremely hard water with acceptable volumes of resins, for example water having hardness equal to 140°F with 900 cm 3 of resin, which to date was unthinkable unless the volume of resins used and the consumption of salt for regeneration of the resins was considerably increased.
  • the saving in resins allows also a reduction in the overall dimensions of the decalcifier, achieving greater facility of assembly and improved accessibility for maintenance work.
  • An equally important advantageous aspect of the present invention is represented by the fact that the reduction in the flow rate of the feed valve makes the same feed of water more accurate, due to the slower water flow to the washing tub and to the devices for measuring the feed.
  • Fig. 1 illustrates a traditional dishwasher formed by a box-like casing 2 with a front door 4 which can be opened for loading the dishes into the washing tub 16 with, at the top, a push-button panel 6 and a knob 8 for switching the machine on/off and for setting the washing cycle.
  • the hydraulic decalcification circuit comprises a decalcifier 1 formed by a tank for the ion exchange resins 3 and a tank for the regeneration salt 5 communicating via a conduit formed at the lower base of the decalcifier 1.
  • This conduit can be opened by a regeneration solenoid valve not shown and, through its end section 7, feeds the brine taken from the salt tank 5 to the resins tank 3.
  • the hydraulic decalcification circuit also comprises a feed valve 10 which feeds hard mains water to a regeneration compartment 12 and from there to the resins tank 3 via a section of the conduit for connection between the tanks 3 and 5 downstream of the regeneration solenoid valve.
  • Said feed valve 10 is a flow control valve, already known in the state of the art, said valve being adjustable to a fixed flow rate.
  • a pair of upper 14u and lower 14d filters define an area for containing the resins 18.
  • an opening 35 is formed which feeds a conduit 37 descending along the side wall of the resins tank 3 and communicating with the washing tub 16 through a mouth 39.
  • the configuration of the resins tank 3 is restricted by the maximum height which can be exploited for its positioning below the washing tub 14, which in a standard dishwasher for eight or twelve place settings is equal at most to 154 mm.
  • the area 18 for containing a volume of 600 cm 3 of resins has been formed with a height/radius ratio equal to 3 and a height of 120 mm.
  • the height/radius ratio of the area 18 will decrease, but the height of the area for containing the resins 18 has to remain at least equal to 120 mm and preferably equal to or near the maximum admissible limit of 130 mm.
  • the body of the upper filter 14u and lower filter 14d of the resins tank 3 is made in a thermoplastic material and comprises a circular base 15 and a side wall 17 wherein a series of slots are formed for the passage of the water.
  • the base 15 has a radius of 40 mm and has a series of twenty-four concentric, circular and equidistant slots 19 supported by four diametric ribs 21, while the side wall has eight equidistant vertical slots 23.
  • the minimum distance between the rims of each slot 19 and 23 is equal to 0.3 mm so that the passage surface of the filter/total surface of the filter ratio is 23%.
  • the number of slots 19 and 23 has to be incremented in such a way that, without changing the minimum distance between the rims of each slot, the aforesaid ratio remains advantageously above 20%.
  • a shoulder extends which can be snap-fastened onto a joined profile 40 formed on the internal wall of the resins tank 3 in such a way that the filters 14u and 14d are supported horizontally.
  • the method of control of the decalcification circuit is the following.
  • the feed valve is set to a flow value between 2 and 2.5 litres/minute, while the feeding in each washing phase is dynamic and takes place with the first two litres of water fed into the washing tub with the circulation pump stopped and with the next two litres of water fed with the circulation pump in motion in such a way as to spray the dishes by means of the nozzles of the rotor of the machine.
  • the regeneration should thus be divided into two parts separated by a brief phase of rinsing of the resins.
  • the first part of regeneration can take place during a washing or rinsing phase of the machine-cycle, wherein a sufficient time of contact between the resins and the regeneration water is allowed, then interrupting the circulation pump for the time necessary for brief rinsing and subsequent discharge of the regeneration water from the washing tub.
  • the second part of regeneration can take place during a subsequent phase of the machine-cycle.
  • each part of regeneration can be performed at the end of a machine-cycle phase.

Landscapes

  • Treatment Of Water By Ion Exchange (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • General Factory Administration (AREA)

Claims (2)

  1. Un procédé de commande d'un circuit hydraulique de décalcification dans un lave-vaisselle domestique avec les étapes : fourniture au lave-vaisselle d'un circuit hydraulique de décalcification comprenant : un décalcificateur (1) formé par un réservoir (3) pour les résines d'échange d'ions et un réservoir (5) pour le sel de régénération des résines, une valve (10) pour l'alimentation dans le réservoir des résines (3) de l'eau courante dure prévue pour le lavage des plats et une paire de filtres supérieur (14u) et inférieur (14d) qui définit une zone (18) du réservoir des résines (3) pour contenir les résines, caractérisé par le fait de ledit procédé utilise ledit circuit hydraulique de décalcification avec une alimentation dynamique dans les phases du cycle de machine du lave-vaisselle, avec la régénération des résines effectuées en deux parties séparées par une courte phase de rinçage des résines, et avec un rinçage des résines effectué en deux parties ou avec un court jet d'alimentation avant le rinçage effectif, et par le fait que la valve d'alimentation (10) dudit circuit de hydraulique de décalcification est réalisée pour être actionnée par des moyens connus, avec un débit compris entre 2 litres/minute et 2,5 litres/minute.
  2. Un procédé de commande d'un circuit hydraulique de décalcification selon la revendication précédente, caractérisé par le fait que les filtres (14u, 14d) sont formés par une base (15) avec des encoches concentriques équidistantes (19) et une paroi latérale (17) dotée d'encoches équidistantes verticales (23), caractérisé par le fait que le rapport surface de passage/surface totale sur les filtres (14u, 14d) est d'au moins 20 %.
EP00125278.2A 1999-12-03 2000-11-27 Procédé de commande d'un circuit hydraulique pour l'optimisation de la décalcification pour lave-vaiselle Expired - Lifetime EP1114607B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI992542 1999-12-03
IT1999MI002542A IT1314106B1 (it) 1999-12-03 1999-12-03 Circuito idraulico perfezionato per l'ottimizzazione delladecalcificazione in particolare per lavastoviglie domestiche e

Publications (2)

Publication Number Publication Date
EP1114607A1 EP1114607A1 (fr) 2001-07-11
EP1114607B1 true EP1114607B1 (fr) 2014-05-28

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EP00125278.2A Expired - Lifetime EP1114607B1 (fr) 1999-12-03 2000-11-27 Procédé de commande d'un circuit hydraulique pour l'optimisation de la décalcification pour lave-vaiselle

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EP (1) EP1114607B1 (fr)
IT (1) IT1314106B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20040212A1 (it) * 2004-03-30 2004-06-30 Bitron Spa Dispositivo di controllo della durezza dell'acqua alimentata ad una macchina lavatrice, in particolare a una macchina lavastoviglie
ITTO20130339A1 (it) 2013-04-24 2014-10-25 Bitron Spa Sistema di alimentazione e trattamento di acqua per una macchina lavastoviglie
ITTO20130338A1 (it) * 2013-04-24 2014-10-25 Bitron Spa Sistema di alimentazione e trattamento di acqua per una macchina lavatrice, in particolare una macchina lavastoviglie
CN111948014B (zh) * 2020-08-21 2023-07-04 长春千麦医学检验实验室有限公司 病理科用组织脱钙后冲水装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731096A1 (de) * 1987-09-16 1989-04-06 Bosch Siemens Hausgeraete Vorrichtung zum enthaerten von wasser
DE4422143A1 (de) * 1994-06-28 1996-01-04 Aweco Kunststofftech Geraete Verfahren zum Betrieb eines Wasserenthärters, insbesondere für Haushaltsmaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1156468B (it) * 1982-05-07 1987-02-04 Indesit Macchina per lavare con procedimento perfezionato di rigenerazione delle resine
DE3641029A1 (de) * 1986-12-01 1988-06-09 Bosch Siemens Hausgeraete Ionenaustauscher einer wasserenthaertungseinrichtung fuer haushaltgeraete
EP0906746A3 (fr) * 1997-09-19 1999-05-19 AWECO Kunststofftechnik Gerätebau GmbH & Co. KG Dispositif pour adoucir l'eau

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731096A1 (de) * 1987-09-16 1989-04-06 Bosch Siemens Hausgeraete Vorrichtung zum enthaerten von wasser
DE4422143A1 (de) * 1994-06-28 1996-01-04 Aweco Kunststofftech Geraete Verfahren zum Betrieb eines Wasserenthärters, insbesondere für Haushaltsmaschinen

Also Published As

Publication number Publication date
ITMI992542A0 (it) 1999-12-03
EP1114607A1 (fr) 2001-07-11
IT1314106B1 (it) 2002-12-04
ITMI992542A1 (it) 2001-06-03

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