EP3000376A2 - Geschirrspülmaschine und hygienisierungsverfahren dafür - Google Patents

Geschirrspülmaschine und hygienisierungsverfahren dafür Download PDF

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Publication number
EP3000376A2
EP3000376A2 EP15192928.8A EP15192928A EP3000376A2 EP 3000376 A2 EP3000376 A2 EP 3000376A2 EP 15192928 A EP15192928 A EP 15192928A EP 3000376 A2 EP3000376 A2 EP 3000376A2
Authority
EP
European Patent Office
Prior art keywords
cycle
hygienization
tub
wash
dishwashing machine
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.)
Granted
Application number
EP15192928.8A
Other languages
English (en)
French (fr)
Other versions
EP3000376B1 (de
EP3000376A3 (de
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
Publication of EP3000376A2 publication Critical patent/EP3000376A2/de
Publication of EP3000376A3 publication Critical patent/EP3000376A3/de
Application granted granted Critical
Publication of EP3000376B1 publication Critical patent/EP3000376B1/de
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 dishwashing machine with cleaning cycles and to a method of hygienization of said machine.
  • 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 200S 024322 discloses generating an air/ozone mixture with rinse water, so as to improve the germ-killing effect without need of high temperature water.
  • WO200S/039377 discloses a dishware washing process that is conducted in the presence of a biocide. This process includes the steps of (i) washing ware in a washing cavity of a ware washer with water and a dishware washing detergent; (ii) rinsing the ware in the dish washer with water; and (iii) introducing a biocide into the washing cavity of the ware washer in order to provide a gaseous atmosphere thereof in the washing cavity, the biocide being introduced into the washing cavity prior to or contemporaneously with or subsequently to the washing or rinsing of the ware.
  • US patent application US200S/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.
  • International patent application WO02007/099113 discloses a washing machine comprising a washing program having ozone wash and detergent wash cycles, a tub, a drum. An ozone generator provides to produce the ozone gas mixed into the water delivered by the main water supply.
  • 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.
  • One object of the present invention is a method of hygienization of a dishwashing machine according to the appended claim 1.
  • a further object of the present invention is a dishwashing machine according to the appended claim 11.
  • An 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.
  • ozone in this field relate to its whitening action, which can easily eliminate any tea or coffee stains from white cups or dishes.
  • 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 preferably distinct from the wash cycles: preferably, it 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, 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)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
EP15192928.8A 2010-10-07 2011-10-07 Geschirrspülmaschine und hygienisierungsverfahren dafür Active EP3000376B1 (de)

Applications Claiming Priority (3)

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.
EP11804790.1A EP2624739B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine mit waschgänge und dessen hygienisierungsmethode
PCT/IB2011/054418 WO2012046208A2 (en) 2010-10-07 2011-10-07 Dishwashing machine with washing cycles and hygienisation method thereof

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP11804790.1A Division EP2624739B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine mit waschgänge und dessen hygienisierungsmethode
EP11804790.1A Division-Into EP2624739B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine mit waschgänge und dessen hygienisierungsmethode

Publications (3)

Publication Number Publication Date
EP3000376A2 true EP3000376A2 (de) 2016-03-30
EP3000376A3 EP3000376A3 (de) 2016-07-13
EP3000376B1 EP3000376B1 (de) 2018-11-28

Family

ID=43738369

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15192928.8A Active EP3000376B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine und hygienisierungsverfahren dafür
EP11804790.1A Active EP2624739B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine mit waschgänge und dessen hygienisierungsmethode

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11804790.1A Active EP2624739B1 (de) 2010-10-07 2011-10-07 Geschirrspülmaschine mit waschgänge und dessen hygienisierungsmethode

Country Status (3)

Country Link
EP (2) EP3000376B1 (de)
IT (1) ITTO20100825A1 (de)
WO (1) WO2012046208A2 (de)

Families Citing this family (1)

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

Citations (6)

* 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
WO2005039377A1 (en) 2003-10-24 2005-05-06 Ozone Wash (Pty) Limited Tableware-washing process including a biocide
WO2007099113A1 (en) 2006-03-01 2007-09-07 Arcelik Anonim Sirketi A washer
US20080011329A1 (en) 2004-12-09 2008-01-17 Bsh Bosch Und Siemens Hausgerate Gmbh Dishwashing Machine Equipped With An Ozone Storage Device
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
US20100000577A1 (en) 2006-11-09 2010-01-07 BSH Bosch und Siemens Hausgeräte GmbH Method for disinfecting conduit systems of a water-conducting household appliance and such a household appliance

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
KR101283870B1 (ko) * 2006-05-15 2013-07-08 엘지전자 주식회사 식기 세척기의 살균 제어 방법
JP2008036232A (ja) * 2006-08-08 2008-02-21 Sharp Corp 食器洗い機
ITRN20070061A1 (it) * 2007-12-21 2009-06-22 Indesit Co Spa Dispositivo elettrico per il lavaggio e/o l asciugatura di oggetti.

Patent Citations (6)

* 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
WO2005039377A1 (en) 2003-10-24 2005-05-06 Ozone Wash (Pty) Limited Tableware-washing process including a biocide
US20080011329A1 (en) 2004-12-09 2008-01-17 Bsh Bosch Und Siemens Hausgerate Gmbh Dishwashing Machine Equipped With An Ozone Storage Device
WO2007099113A1 (en) 2006-03-01 2007-09-07 Arcelik Anonim Sirketi A washer
US20100000577A1 (en) 2006-11-09 2010-01-07 BSH Bosch und Siemens Hausgeräte GmbH Method for disinfecting conduit systems of a water-conducting household appliance and such a household appliance
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

Also Published As

Publication number Publication date
EP3000376B1 (de) 2018-11-28
WO2012046208A2 (en) 2012-04-12
EP2624739A2 (de) 2013-08-14
EP2624739B1 (de) 2015-12-09
WO2012046208A3 (en) 2012-07-26
ITTO20100825A1 (it) 2012-04-08
EP3000376A3 (de) 2016-07-13

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