EP2624739B1 - Machine lave-vaisselle à cycles de lavage et procédé pour sa désinfection - Google Patents

Machine lave-vaisselle à cycles de lavage et procédé pour sa désinfection Download PDF

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Publication number
EP2624739B1
EP2624739B1 EP11804790.1A EP11804790A EP2624739B1 EP 2624739 B1 EP2624739 B1 EP 2624739B1 EP 11804790 A EP11804790 A EP 11804790A EP 2624739 B1 EP2624739 B1 EP 2624739B1
Authority
EP
European Patent Office
Prior art keywords
tub
hygienization
wash
cycle
ozone
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
EP11804790.1A
Other languages
German (de)
English (en)
Other versions
EP2624739A2 (fr
Inventor
Luca Bossi
Leonardo Arteconi
Annalisa Ciarletta
Paolo Faraldi
Sandro Duri
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Priority to EP15192928.8A priority Critical patent/EP3000376B1/fr
Publication of EP2624739A2 publication Critical patent/EP2624739A2/fr
Application granted granted Critical
Publication of EP2624739B1 publication Critical patent/EP2624739B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A47L15/0015—Washing processes, i.e. machine working principles characterised by phases or operational steps other treatment phases, e.g. steam or sterilizing phase
    • 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
    • A47L15/4236—Arrangements to sterilize or disinfect dishes or washing liquids
    • A47L15/424—Arrangements to sterilize or disinfect dishes or washing liquids by using ozone
    • 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
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/08—Ozone

Definitions

  • the present invention relates to a method of hygienization of a dishwashing machine according to the preamble of claim 1.
  • dishwashing machines derives from the fact that users often do not load the machine with a quantity of crockery sufficient to carry out a full-load wash cycle, with the consequence that it is often uneconomical to carry out a wash program in such conditions, in that it would imply a waste of energy, water and washing agents (rinse aid and detergents).
  • German patent publication DE 10 2008 024322 discloses generating an air/ozone mixture with rinse water, so as to improve the germ-killing effect without need of high temperature water.
  • US patent application US2008/0011329 having title "DISH WASHING MACHINE EQUIPPED WITH AN OZONE STORAGE DEVICE” discloses a dishwashing machine provided with an ozone generator and with a storage device for storing ozone and/or hydroxyl radicals. Ozone is dispensed either during a washing cycle in order to increase the cleaning action or during a "drying" phase at the end of the washing cycle, or during a non-operating phase in order to remove odors. Dispensing of ozone during non-operating phase is made automatically in response to opening/closing of the door or periodically.
  • US patent 5,524,358 discloses a ventilation filtration kit for use with dishwashers.
  • the kit may comprise a germicidal lamp to disinfect air being drawn and provide residual ozone to disinfect the dishes and eating utensils within the dishwasher.
  • US patent application US2010/0000577 further discloses use of a gaseous disinfectant, such as ozone, to be fed into a liquid circulating in a conduit to be disinfected.
  • a gaseous disinfectant such as ozone
  • the present invention aims at solving the problem of how to make the operation of sanitizing of the tub of the dishwasher more reliable, flexible and efficient. This is achieved by the method defined in appended claim 1.
  • One idea at the basis of the present invention is to diffuse an oxidizing gas, such as ozone, only during operating cycles wherein no liquid is dispensed into the tub; said operating cycles, having a hygienization function, can be carried out, for example, when dirty crockery is placed into the tub awaiting the start of a wash program.
  • an oxidizing gas such as ozone
  • This gas is, in fact, a strong oxidizing agent, and as such, when used in a dishwashing machine, it sterilizes and oxidizes organic substances, thereby eliminating the bad smells originating from the proliferation of bacteria inside the tub of the machine.
  • Other known properties of ozone in this field relate to its whitening action, which can easily eliminate any tea or coffee stains from white cups or dishes.
  • the hygienization cycle is carried out without any liquid being dispensed into the tub during said operating program and in a condition wherein the degree of humidity in the tub is approximately equal to that in the outside environment. In this way it is advantageously possible to obtain a simpler machine construction while effectively cleaning the tub and any crockery contained therein.
  • FIG. 1 there is shown a schematic view of a dishwashing machine according to the present invention.
  • It comprises a tub 2 in which crockery to be subjected to the machine's washing action is placed.
  • the crockery is arranged in sliding racks 3 that can be extracted through the opening the tub 2, which is closed by the horizontally-pivoted door 3.
  • rotary sprayers 4 which spray wash liquid (water, water and detergents and/or rinse aids or the like) onto the crockery during the wash cycles.
  • the wash liquid is supplied to the sprayers 4 through the hydraulic circuit 5, which connects them to the pump 6.
  • the wash liquid collects into the sump 7 at the bottom of the tub 2, from which it returns to the pump 6 through the duct 8 or is drained through the duct 9.
  • wash cycle refers to any operating step of the machine 1 wherein water or wash liquid is dispensed by the sprayers 4 or wherein, likewise, the pump 6 is on; during the wash cycles, the degree of humidity in the air inside the tub is normally higher than the degree of humidity in the air in the outside environment.
  • the machine 1 also comprises a cleaning circuit which comprises a duct 10 in fluidic communication with the sump 7, an ozone generator 11, an air pump 12 and an intake duct 13 that opens into the outside and takes in environmental air.
  • the duct 10 puts the sump (and therefore the inside of the tub 2) in fluidic communication with the ozone generator 11.
  • the latter is preferably of the so-called "corona discharge" type, such as those of the TCB-66, TCB-56 e TCB-115 series available from Trump Electronics.
  • the ozone generator 11 is supplied by the pump 12 with air taken from the environment through the intake duct 13.
  • the pump may likewise be a fan or the like.
  • valve 15 e.g. a non-return valve for liquids, which prevents the wash liquid from reaching the generator 11.
  • a solenoid valve or even a simple gate valve may be used, which is kept closed as the sump 7 is filling with liquid or during a wash cycle.
  • the method of operation according to the present invention provides for the execution of a hygienization program comprising at least one hygienization cycle wherein ozone is dispensed into the tub prior to one or more wash cycles.
  • the user can carry out the hygienization cycle to remove any bacteria, microbes and bad smells, and then wait until the machine can be completely filled.
  • the hygienization program is distinct from the wash cycles and is carried out prior to the latter, i.e. when the degree of humidity in the tub is substantially equal to the degree of humidity in the environment outside the tub. Such a hygienization program, therefore, dispenses no wash liquid or water, and the ozone diffusion medium is air.
  • the hygienization cycle takes place before the execution of the wash cycles, in a condition wherein the degree of humidity in the air inside the tub is substantially equal to that in the environment outside the tub.
  • the term "hygienization cycle” refers to an operating step of the machine 1 wherein the pump 12 and the generator 11 are on. According to a variant of this method of operation, wich however does not belong to the present invention, the hygienization cycle is carried out between two successive wash cycles.
  • a hygienization cycle is carried out during every interval between one wash cycle and the next.
  • the ozone diffusion medium is environmental air, not a liquid, and this allows to overcome the above-described drawbacks.
  • the operating program includes an initial step wherein, with the crockery loaded in the racks 3, water taken from the water mains (not shown) is supplied into the tub.
  • the water pump 6 is then turned on, while the air pump 12 remains off.
  • the water collected in the sump 7 inside the tub is delivered to the sprayers 4, to be sprayed onto the crockery.
  • Both the pump 12 and the generator 11 are kept off, and the selected wash cycle (in this case a prewash cycle) is started.
  • valve 15 is kept closed to prevent any water from reaching the ozone generator.
  • a hygienization cycle is then carried out, during which, with no liquid in the tub, the water pump 6 is kept off and the air pump 12 is turned on.
  • the ozone generator 11 is turned on as well and, if present, the valve 15 is opened.
  • the air taken in from the outside environment through the duct 13 flows past the pump 12 and reaches the ozone generator 11, where it is charged with ozone in accordance with a per se known method, which will not be described any further herein.
  • the air thus charged is the medium used for diffusing ozone in the tub: in fact, it is delivered into the latter through the duct 8 and through the sump 7, which in this operating condition contains no liquids.
  • this phase can be identified by measuring the degree of humidity in the air inside the tub, which is substantially equal to the degree of humidity in the outside environment.
  • ozone may be replaced with another gas or, more in general, with a fluid having the same effect, in particular an oxidizing gas, which will only require that the ozone generator 11 be replaced with a suitable generator of said gas or fluid.
  • a fan may also be used for improving ozone distribution in the tub.
  • said fan can be turned on to evenly distribute the ozone during the hygienization cycle.
  • Said fan is included in a closed circuit that takes air from the tub and recirculates it into the tub; it may be positioned, for example, in a duct external to the tub, so as to prevent any contact with the wash liquid.

Landscapes

  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)

Claims (4)

  1. Procédé de désinfection d'une machine lave-vaisselle, dans lequel ladite machine réalise au moins un cycle de lavage dans lequel un liquide de lavage est délivré dans une cuve de ladite machine,
    dans lequel le procédé comporte un programme de désinfection comportant un cycle de désinfection dans lequel un fluide d'oxydation est délivré dans ladite cuve, ledit cycle de lavage et ledit cycle de désinfection étant distincts l'un de l'autre,
    et dans lequel au moins ledit programme de désinfection est réalisé avant ledit, au moins un, cycle de lavage, dans une situation dans laquelle le degré d'humidité dans la cuve est approximativement égal à un degré d'humidité dans un environnement extérieur à la cuve,
    caractérisé en ce qu'un utilisateur de la machine lave-vaisselle exécute ledit cycle de désinfection sans l'exécution d'un programme de lavage ou d'un ou de plusieurs cycle(s) de lavage, de sorte qu'on reconnaît que le, au moins un, cycle de lavage n'a pas encore démarré en mesurant le degré d'humidité de l'air à l'intérieur de la cuve, lequel, avant le démarrage du cycle de lavage, est essentiellement égal au degré d'humidité de l'environnement extérieur.
  2. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit programme de désinfection comporte l'étape comportant l'étape de délivrer un gaz contenant de l'ozone dans ladite cuve.
  3. Procédé selon l'une quelconque des revendications précédentes, dans lequel un milieu de diffusion de l'ozone dans ladite cuve est de l'air.
  4. Procédé selon l'une ou plusieurs des revendications précédentes, dans lequel ladite machine comprend une pompe (6) destinée à dispenser ledit liquide de lavage et une pompe (12) pour orienter l'air prélevé à partir de l'environnement extérieur à ladite machine vers un générateur d'ozone (11) et, à partir de là, vers ladite cuve, et
    dans lequel, pendant le cycle de désinfection, ladite pompe (6) destinée à délivrer ledit liquide de lavage ne fonctionne pas et ladite pompe (12) destinée à l'air prélevé à partir de l'environnement extérieur fonctionne.
EP11804790.1A 2010-10-07 2011-10-07 Machine lave-vaisselle à cycles de lavage et procédé pour sa désinfection Active EP2624739B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15192928.8A EP3000376B1 (fr) 2010-10-07 2011-10-07 Machine à laver la vaisselle et son procédé d'hygiénisation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000825A ITTO20100825A1 (it) 2010-10-07 2010-10-07 Macchina lavastoviglie con cicli di pulizia e metodo di igienizzazione di tale macchina.
PCT/IB2011/054418 WO2012046208A2 (fr) 2010-10-07 2011-10-07 Machine lave-vaisselle à cycles de lavage et procédé d'hygiénisation de celle-ci

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP15192928.8A Division EP3000376B1 (fr) 2010-10-07 2011-10-07 Machine à laver la vaisselle et son procédé d'hygiénisation
EP15192928.8A Division-Into EP3000376B1 (fr) 2010-10-07 2011-10-07 Machine à laver la vaisselle et son procédé d'hygiénisation

Publications (2)

Publication Number Publication Date
EP2624739A2 EP2624739A2 (fr) 2013-08-14
EP2624739B1 true EP2624739B1 (fr) 2015-12-09

Family

ID=43738369

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11804790.1A Active EP2624739B1 (fr) 2010-10-07 2011-10-07 Machine lave-vaisselle à cycles de lavage et procédé pour sa désinfection
EP15192928.8A Active EP3000376B1 (fr) 2010-10-07 2011-10-07 Machine à laver la vaisselle et son procédé d'hygiénisation

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP15192928.8A Active EP3000376B1 (fr) 2010-10-07 2011-10-07 Machine à laver la vaisselle et son procédé d'hygiénisation

Country Status (3)

Country Link
EP (2) EP2624739B1 (fr)
IT (1) ITTO20100825A1 (fr)
WO (1) WO2012046208A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3391799A1 (fr) * 2017-04-18 2018-10-24 V-Zug AG Lave-vaisselle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070274856A1 (en) * 2006-05-15 2007-11-29 Lg Electronics Inc. Sterilizing control method for diswasher
EP2072658A1 (fr) * 2007-12-21 2009-06-24 Indesit Company, S.P.A. Dispositif électrique pour nettoyer et/ou sécher des articles

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5524358A (en) * 1995-03-24 1996-06-11 Matz; Warren W. Dishwasher ventilation filtration kit
JPH1014844A (ja) * 1996-07-04 1998-01-20 Sanyo Electric Works Ltd 食器・器具洗浄殺菌装置
JP2003144372A (ja) * 2001-11-14 2003-05-20 Sanyo Electric Co Ltd 食器洗い機
EP1675496B1 (fr) * 2003-10-24 2012-09-26 Ozone Wash (Pty) Limited Procede de lavage d'articles de table comprenant un biocide
DE102005004091A1 (de) * 2004-12-09 2006-06-22 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit Ozonspeicher
EP1989350B1 (fr) * 2006-03-01 2011-06-01 Arçelik Anonim Sirketi Lave-linge
JP2008036232A (ja) * 2006-08-08 2008-02-21 Sharp Corp 食器洗い機
DE102006052890A1 (de) * 2006-11-09 2008-05-15 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Desinfektion von Leitungssystemen eines wasser-führenden Haushaltsgeräts sowie derartiges Haushaltsgerät
DE102008024322A1 (de) * 2008-05-20 2009-11-26 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit Ozongenerator und Verfahren zur Verbesserung der Hygiene in einem Geschirrspüler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070274856A1 (en) * 2006-05-15 2007-11-29 Lg Electronics Inc. Sterilizing control method for diswasher
EP2072658A1 (fr) * 2007-12-21 2009-06-24 Indesit Company, S.P.A. Dispositif électrique pour nettoyer et/ou sécher des articles

Also Published As

Publication number Publication date
EP3000376B1 (fr) 2018-11-28
ITTO20100825A1 (it) 2012-04-08
EP2624739A2 (fr) 2013-08-14
WO2012046208A2 (fr) 2012-04-12
EP3000376A2 (fr) 2016-03-30
WO2012046208A3 (fr) 2012-07-26
EP3000376A3 (fr) 2016-07-13

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