EP0772995B1 - Dishwashing machine with differenced washing capability - Google Patents

Dishwashing machine with differenced washing capability Download PDF

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Publication number
EP0772995B1
EP0772995B1 EP96117865A EP96117865A EP0772995B1 EP 0772995 B1 EP0772995 B1 EP 0772995B1 EP 96117865 A EP96117865 A EP 96117865A EP 96117865 A EP96117865 A EP 96117865A EP 0772995 B1 EP0772995 B1 EP 0772995B1
Authority
EP
European Patent Office
Prior art keywords
dishwashing machine
washing
hydraulic circuit
pump
liquid
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
EP96117865A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0772995A1 (en
Inventor
Giuseppe Marchitto
Fabio Roncati
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
Merloni Elettrodomestici 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 Merloni Elettrodomestici SpA filed Critical Merloni Elettrodomestici SpA
Publication of EP0772995A1 publication Critical patent/EP0772995A1/en
Application granted granted Critical
Publication of EP0772995B1 publication Critical patent/EP0772995B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47L15/4214—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

Definitions

  • the present invention concerns a dishwashing machine with capability of washing a reduced load, also called differentiated washing, and a method for operating a dishwashing machine.
  • dishwashing machines generally consist of a box-like structure defining a washing chamber, wherein an upper basket and a lower basket are housed to load the crockery to be washed.
  • a sprayer which, rotating around a vertical axis, strikes the crockery positioned in the overlaying basket with several wash-liquid jets.
  • dishwashing machines it may be desirable to be able to carry out a differentiated washing cycle if only one basket is used to contain the crockery, i.e. a washing cycle where the machine takes in a reduced water quantity and only the sprayer corresponding to the basket being used is supplied by the wash liquid to reduce water consumption.
  • the reduced water supply is possible for instance by having the machine control system which changes the control thresholds of a pressure switch if a differentiated washing is selected, so that a lower quantity of water than required for a standard washing cycle will be introduced into the machine washing-tub.
  • This document describes a dishwashing machine equipped with two independent hydraulic circuits, one for each sprayer, supplied through two washing pumps. Thus, if a differentiated washing cycle is selected, one pump alone will start operating and only one sprayer will be supplied with wash liquid.
  • a second known technical solution concerning differentiated washing, within the frame of selective water supply is to provide an interception device in one of the two sprayer supply arms for dishwashing machines with one pump only.
  • the interception device closes one of the hydraulic circuit arms, so that only one of the two sprayers will be supplied with wash liquid.
  • said objects are obtained by a dishwashing machine having the characterizing features of the enclosed claim 1 and by a method for operating a dishwashing machine having the characterizing features of the enclosed claim 10. Further advantageous embodiments of the invention are contained in the dependent claim 2-9 and 11-12.
  • FIG. 1 shows schematically the hydraulic circuit of a dishwashing machine with differentiated washing capability according to the known state of the art
  • Fig. 1 shows schematically the hydraulic circuit of a dishwashing machine with differentiated washing capability according to the second kind of known technology mentioned at the beginning of this description.
  • reference number 2 indicates a washing pump drawing some washing liquid from a collecting sump indicated by number 1, usually available on the bottom of the dishwasher tub. Said pump 2 forces the washing liquid into an hydraulic circuit comprising a first supply arm 3 for a lower sprayer 4 and a second supply arm 5 for an upper sprayer 6.
  • An interception element indicated by number 7 is provided according to the above known technology, such as for instance a solenoid valve that appears inserted in the supply arm 3 of the lower sprayer 4. Such an interception element 7 is actuated by a control element, not shown in the figure for simplicity's sake, as a function of the selection of a differentiated washing cycle actuated by the user.
  • CP indicates the typical curve of the pump 2
  • CS and Cl indicate the load curves of the upper supply arm 5-6 and of the lower supply arm 3-4 of the machine hydraulic circuit, respectively.
  • CG indicates the global load curve of the entire hydraulic circuit. Since arms 3-4 and 5-6 are parallel, the curve CG is obtained by summing the abscissas Q (flows) of the curves CS and Cl at equaling ordinates H (heads).
  • the work point N of the pump 2 is given by the intersection of the curves CP and CG.
  • the pump has to be sized for a nominal function being characterized by the flow Qn and the head Hn.
  • the interception element 7 of Fig. 1 closes the arm 3 and the total load curve will then correspond to the one indicated by CS.
  • an auxiliary hydraulic duct or arm indicated with 8 is provided, preferably containing inside an adjusting element 9 as it will be further described.
  • the auxiliary hydraulic duct 8 is inserted as a by-pass between a downstream point and an upstream point of the pump 2, such as in particular the collecting sump 1. Such an auxiliary duct 8 is automatically open when selecting a differentiated washing-cycle.
  • the duct 8 is inserted between a point of the supply arm 3 of the lower sprayer 4 and the sump 1, so as to be activated by the interception element 7'; thus, according to the present invention, the element 7' is practically operating like a flow deviation valve.
  • the fine curve indicated with CR represents the load curve of the auxiliary circuit 8-9, preset by a proper setting and/or configuration of the element 9 (that will obviously be determined during the design stage of the entire hydraulic circuit for the dishwashing machine).
  • the new global load curve becomes the fine curve indicated with C'G' (obtained by the sum of CS and CR) and the new operation point will be R.
  • pump operation is now characterized by the flow Qr, which is lower than the flow Qn of the standard washing cycle and by the head Hr, which is higher than the nominal value Hn.
  • the invention represents a simple, low-cost reliable system to obtain a differentiated washing-cycle, associated to a reduced washing-liquid consumption, causing no dangerous stress to the most delicate hydraulic elements, such as the washing pump and the interception valve.
  • the setting element 9 can be replaced by a real device (such as a flow regulator) suitable to change the hydraulic characteristics of the auxiliary duct 8 according to changing requirements.
  • interception element 7' and the auxiliary duct 8 can be inserted between a point of the supply arm 5 of the upper sprayer 6 and the sump 1, in case the machine has to execute a differentiated washing using the lower basket of the dishwashing machine.
  • interception element 7' and the inlet of the auxiliary duct 8 can be located on the supply arm 3 in a different position in respect to the one shown by way of example in Fig. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
EP96117865A 1995-11-10 1996-11-07 Dishwashing machine with differenced washing capability Expired - Lifetime EP0772995B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950908 1995-11-10
IT95TO000908A IT1280477B1 (it) 1995-11-10 1995-11-10 Macchina lavastoviglie con possibilita' di lavaggio differenziato

Publications (2)

Publication Number Publication Date
EP0772995A1 EP0772995A1 (en) 1997-05-14
EP0772995B1 true EP0772995B1 (en) 2001-05-23

Family

ID=11413953

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117865A Expired - Lifetime EP0772995B1 (en) 1995-11-10 1996-11-07 Dishwashing machine with differenced washing capability

Country Status (4)

Country Link
EP (1) EP0772995B1 (it)
DE (1) DE69612941T2 (it)
ES (1) ES2158212T3 (it)
IT (1) IT1280477B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106821251A (zh) * 2015-02-02 2017-06-13 Lg电子株式会社 洗碗机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812231A1 (de) * 1998-03-20 1999-09-23 Aeg Hausgeraete Gmbh Geschirrspülmaschine
IT1303258B1 (it) * 1998-10-28 2000-11-06 Smeg Spa Lavastoviglie con ciclo di pre-riscaldamento.
KR100617121B1 (ko) * 2004-09-16 2006-08-31 엘지전자 주식회사 식기 세척기의 제어방법
ITTO20070347A1 (it) * 2007-05-16 2008-11-17 Premark Feg Llc Pompa a doppia mandata per un elettrodomestico, ed elettrodomestico munito della stessa

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443231A2 (fr) * 1978-12-08 1980-07-04 Esswein Sa Procede de lavage de la vaisselle, systeme de mise en oeuvre de ce procede, et machine a laver la vaisselle munie d'un tel systeme
FR2494804A1 (fr) * 1980-11-27 1982-05-28 Esswein Sa Dispositif de distribution d'eau et lave-vaiselle equipe d'un tel dispositif
IT1135789B (it) * 1981-05-14 1986-08-27 Candy Ind Spa Perfezionamento nelle macchine lavastoviglie
DE3209542C1 (de) * 1982-03-16 1992-05-07 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Geschirrspülmaschine
IT1191526B (it) * 1986-03-19 1988-03-23 Zanussi Elettrodomestici Macchina lavatrice con valvola di distribuzione del flusso di un liquido

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106821251A (zh) * 2015-02-02 2017-06-13 Lg电子株式会社 洗碗机
CN106821251B (zh) * 2015-02-02 2019-11-26 Lg电子株式会社 洗碗机

Also Published As

Publication number Publication date
DE69612941D1 (de) 2001-06-28
ES2158212T3 (es) 2001-09-01
DE69612941T2 (de) 2001-09-13
ITTO950908A1 (it) 1997-05-10
IT1280477B1 (it) 1998-01-20
EP0772995A1 (en) 1997-05-14
ITTO950908A0 (it) 1995-11-10

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