EP0460250B1 - Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau - Google Patents

Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau Download PDF

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Publication number
EP0460250B1
EP0460250B1 EP19900110587 EP90110587A EP0460250B1 EP 0460250 B1 EP0460250 B1 EP 0460250B1 EP 19900110587 EP19900110587 EP 19900110587 EP 90110587 A EP90110587 A EP 90110587A EP 0460250 B1 EP0460250 B1 EP 0460250B1
Authority
EP
European Patent Office
Prior art keywords
water
sump
washing
dishwashing machine
washing chamber
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
EP19900110587
Other languages
German (de)
English (en)
Other versions
EP0460250A1 (fr
Inventor
Dino Bongini
Mario Samoncini
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
Priority to DE1990621871 priority Critical patent/DE69021871T2/de
Priority to ES90110587T priority patent/ES2076991T3/es
Priority to EP19900110587 priority patent/EP0460250B1/fr
Publication of EP0460250A1 publication Critical patent/EP0460250A1/fr
Application granted granted Critical
Publication of EP0460250B1 publication Critical patent/EP0460250B1/fr
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
    • A47L15/4244—Water-level measuring or regulating arrangements

Definitions

  • the present invention refers to a dishwashing machine having a high precision in the dosage of the washing water.
  • dishwashing machines are usually supplied with the water necessary to the washing operations, by enabling the opening of an electric valve arranged on the supply pipe connected to the water main.
  • the supplied water is collected in a sump which is arranged under the washing chamber and whose mouth is defined in the lower wall of the washing chamber.
  • Such a sump is connected to the suction pipe of a washing pump which supplies the spraying arms fitted in the washing chamber.
  • the sump has a volume smaller than the volume of water required for the operation of the machine and the level of the water charged in the machine rises over the lower wall of the washing chamber.
  • the water inlet is interrupted when the water reaches a predefined level which is detected by means of appropriate sensor means, for instance a pressure switch with a sensor arranged in the sump.
  • the water inlet is done with the washing pump not operating, while in other types of machines the washing pump is enabled during such inlet, by presetting in a suitably way the sensor means.
  • the water level at the end of the inlet reaches the washing chamber and so the water surface has an area substantially equal to the section of such chamber.
  • the detecting tollerance can be of some millimeters with variations of the quantity of charged water in the order of about one liter for each charging.
  • EP-A-248 339 a method for controlling the supply of water to a washing machine wherein the sump shows a complicated hydraulic structure, comprising a collecting well, communicating with a control chamber, where the pressure sensitive means are located, via an overflow wall on one side and with the intake of the circulation pump on the other side, via communication means having a calibrated section.
  • the main object of the present invention is to solve the above said problem realizing a dishwashing machine which has a high precision in the dosage of the washing water.
  • a further aim of the invention is to realize a dishwashing machine which shows reduced water and energy consumption.
  • This object and the said and other aims which could be better understood later, are obtained by a dishwashing machine, and a method for the dosage of the washing water in a dishwashing machine, comprising the characterizing feature of the annexed claims 1 and 5.
  • the dish-washing machine indicated as a whole with reference number 1, comprises a water collecting sump 2, which is arranged under the lower wall 3 of the washing chamber 4, and which presents a mouth defined in such lower wall.
  • Sump 2 presents, in known way, ports 5 and 6 connected respectively to the suction pipes of a washing pump 7, which supplies one or more spraying arms (8) fitted in the washing chamber 4, and of a drainage pump, of known type and not shown for simplicity.
  • sump 2 is realized so to have a working volume at least equal to the difference between the total volume of water required for the correct operation of the machine and the total volume of water that is kept in circulation, outside the sump, by washing pump 7 when working. Furthermore, in corrispondence of the level 9 reached in the sump by a volume of water equal to such difference, the sump shows, in a horizontal plane tangent to the water surface, a passage section notably smaller than the section of the washing chamber 4.
  • said passage section has an area which is preferably comprised between 1/6 and 1/4 of the section of the washing chamber 4.
  • the water level inside the sump 2 is detected by means of a pressure switch 10 of known type, which has a sensor 11 arranged inside the sump 2, below the level 9.
  • Zone 11a is connected by a pipe 12 with the body of the pressure switch which transforms the pneumatic signal into an electric command.
  • FIG 3 it is shown in a very schematic and simplified way an electric circuit 14 which feeds the control device 15 of the supply electric valve 16 of the machine arranged on the supply pipe 17 connected to the water main. More in detail, circuit 14 provides in series first interruption means 18 of the electric supply and second interruption means 19 controlled respectively by the pressure switch 10 and by a timer which controls the various stages of the washing cycle of the machine. First interruption means 18 and second interruption means 19 are arranged in series and could be, for instance, on-off or chance-over switches.
  • the water inlet in the dishwashing machine according to the invention is as follows.
  • timer 20 closes the switch 19 and pressure switch 10 does not act on switch 18, closed itself at this stage.
  • electric supply valve 16 is open and supply pipe 17 charges water in the machine, which collects in the sump 2.
  • washing pump 7 sucking from the sump 2, conveys water to spraying arms 8.
  • the water inlet continues until the water in the sump reaches a level corresponding to the preset value of the pressure switch 10.
  • the water level corresponding to the preset of the pressure switch lays under the lower wall 3 of the washing chamber 4. In this way, possible tolerances in the preset value of the pressure switch can cause only very small variations of the charged water quantity because the passage section of the sump in the zone irrid by the water surface, near the correct level, is small and in any case notably smaller than the section of the washing chamber 4.
  • the achieving of the correct level cause the opening of the switch 18 and so the closure of the electric supply valve 16 which interrupts the water inlet.
  • the dishwashing machine according to the invention fulfils very well the extablished aim, because, due to the fact that the correct water level is reached in a zone of the machine which has a water passage section highly reduced in respect of the section of the washing chamber, by using a pressure switch with a sensitivity equal to the ones employed in the traditional dishwashing machines where such level lays over the lower wall, it is obtained a more precise dosage of the charged water.
  • a further advantage is that the inlet of a water quantity compensates in an automatic way for the operating tolerance of the washing pump and the spraying arms, and the water pipes geometric variations due to manufacturing spreads and circuit modifications, because the water dosage is done with the washing pump operating. Also for this reason, the final dosage depends on the easiness for water to fall in the sump, which is influenced by the crockery presence, that is to say the dosage is self-regulated in function of the crockery load.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Claims (5)

  1. Lave-vaisselle ayant une haute précision de dosage de lavage, comprenant un puisard collecteur d'eau (2) agencé sous la paroi inférieure (3) d'une chambre de lavage (4), et muni d'une bouche définie dans ladite paroi inférieure (3), ledit puisard (2) ayant au moins un premier orifice (5) qui communique avec le tuyau d'aspiration d'une pompe (7) reliée, par son côté de refoulement, à au moins un bras (8) d'arrosage de la vaisselle agencé à l'intérieur de ladite chambre de lavage (4), des moyens détecteurs du niveau d'eau (10, 11, 12) étant prévus dans ledit puisard (2), l'élément sensible (11) desdits moyens détecteurs du niveau d'eau (10, 11, 12) étant agencé directement à l'intérieur dudit puisard, caractérisé
    - en ce que le volume de travail dudit puisard (2) est au moins égal à la différence entre le volume total d'eau nécessaire pour le fonctionnement de la machine et le volume d'eau maintenu en circulation à l'extérieur dudit puisard (2) lorsque la pompe (7) est en marche, et
    - en ce qu'au niveau (9) atteint dans ledit puisard (2) par une quantité d'eau égale à ladite différence, ledit puisard (2) présente, dans un plan horizontal tangent à la surface libre de l'eau, une section de passage (9) qui est sensiblement comprise entre 1/6 et 1/4 de la section de la chambre de lavage (4).
  2. Lave-vaisselle selon la revendication 1, caractérisé en ce qu'il comprend une électrovalve (16) qui commande l'introduction d'eau dans ledit puisard (2), ladite valve étant alimentée par un circuit électrique comprenant en série au moins des premiers moyens (18) d'interruption de l'alimentation électrique et des deuxièmes moyens (19) d'interruption de l'alimentation électrique.
  3. Lave-vaisselle selon la revendication 2, caractérisé en ce que lesdits premiers moyens (18) d'interruption de l'alimentation électrique sont commandés par une minuterie (20) et lesdits deuxièmes moyens (19) d'interruption de l'alimentation électrique sont commandés par lesdits moyens détecteurs du niveau d'eau (10, 11, 12).
  4. Lave-vaisselle selon la revendication 2, caractérisé en ce que lesdits premiers moyens (18) d'interruption de l'alimentation électrique et/ou lesdits deuxièmes moyens (19) d'interruption de l'alimentation électrique sont représentés par des commutateurs marche-arrêt ou inverseurs.
  5. Procédé pour le dosage de l'eau de lavage dans un lave-vaisselle comprend un puisard collecteur d'eau (2) agencé sous la paroi inférieure (3) d'une chambre de lavage (4) et présentant une bouche définie dans ladite paroi inférieure (3), ledit puisard (2) ayant au moins un premier orifice (5) qui communique avec le tuyau d'aspiration d'une pompe (7) reliée par son côté de refoulement à au moins un bras (8) d'arrosage de la vaisselle agencé à l'intérieur de ladite chambre de lavage (4), des moyens (10, 11, 12) détecteurs du niveau d'eau étant prévus dans ledit puisard (2), le procédé comprenant la phase consistant à :
    - introduire de l'eau de lavage dans ledit puisard collecteur (2), et
    - mettre ladite pompe de lavage (7) en marche pendant ladite introduction pour aspirer dans ledit puisard (2) et alimenter ledit bras d'arrosage (8), de manière qu'une quantité d'eau soit maintenue en circulation à l'extérieur dudit puisard (2) pendant que ladite pompe (7) travaille, ledit procédé étant caractérisé en ce qu'il comprend la phase consistant à interrompre l'introduction d'eau lorsque l'eau atteint dans ledit puisard (2) un niveau (9) correspondant à la différence entre le volume total d'eau nécessaire pour le fonctionnement de la machine et le volume d'eau maintenu en circulation à l'extérieur dudit puisard (2), la surface libre de l'eau présentant, audit niveau (9) à l'intérieur du puisard (2), une aire qui est sensiblement comprise entre 1/6 et 1/4 de la section de la chambre de lavage (4).
EP19900110587 1990-06-05 1990-06-05 Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau Expired - Lifetime EP0460250B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1990621871 DE69021871T2 (de) 1990-06-05 1990-06-05 Geschirrspülmaschine mit verbesserter Waschwasserdosierung.
ES90110587T ES2076991T3 (es) 1990-06-05 1990-06-05 Maquina lavaplatos con dosificacion mejorada del agua de lavado.
EP19900110587 EP0460250B1 (fr) 1990-06-05 1990-06-05 Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900110587 EP0460250B1 (fr) 1990-06-05 1990-06-05 Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau

Publications (2)

Publication Number Publication Date
EP0460250A1 EP0460250A1 (fr) 1991-12-11
EP0460250B1 true EP0460250B1 (fr) 1995-08-23

Family

ID=8204053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900110587 Expired - Lifetime EP0460250B1 (fr) 1990-06-05 1990-06-05 Machine à laver la vaisselle avec dispositif de réglage du niveau d'eau

Country Status (3)

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EP (1) EP0460250B1 (fr)
DE (1) DE69021871T2 (fr)
ES (1) ES2076991T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140949C2 (de) * 1991-12-12 1996-07-11 Aeg Hausgeraete Gmbh Niveausteuerung für eine Geschirrspülmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2239671C3 (de) * 1972-08-11 1982-02-18 Euro Hausgeräte GmbH, 6680 Neunkirchen Waschbehälter einer Geschirrspülmaschine
US3835880A (en) * 1973-08-10 1974-09-17 Gen Motors Corp Dishwasher fill system
DE3537789A1 (de) * 1985-10-24 1987-04-30 Licentia Gmbh Verfahren und vorrichtung zum befuellen eines behaelters
IT1192084B (it) * 1986-06-04 1988-03-31 Zanussi Elettrodomestici Macchina lavatrice con sistema di controllo del carico d'acqua

Also Published As

Publication number Publication date
EP0460250A1 (fr) 1991-12-11
DE69021871T2 (de) 1996-04-04
DE69021871D1 (de) 1995-09-28
ES2076991T3 (es) 1995-11-16

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