EP0152893B1 - Lave-vaisselle à détecteur de niveau du type à trop-plein - Google Patents

Lave-vaisselle à détecteur de niveau du type à trop-plein Download PDF

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Publication number
EP0152893B1
EP0152893B1 EP85101458A EP85101458A EP0152893B1 EP 0152893 B1 EP0152893 B1 EP 0152893B1 EP 85101458 A EP85101458 A EP 85101458A EP 85101458 A EP85101458 A EP 85101458A EP 0152893 B1 EP0152893 B1 EP 0152893B1
Authority
EP
European Patent Office
Prior art keywords
chamber
level
liquid
overflow
tub
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
Application number
EP85101458A
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German (de)
English (en)
Other versions
EP0152893A1 (fr
Inventor
Mario Battel
Claudio Milocco
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi 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 Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT85101458T priority Critical patent/ATE33927T1/de
Publication of EP0152893A1 publication Critical patent/EP0152893A1/fr
Application granted granted Critical
Publication of EP0152893B1 publication Critical patent/EP0152893B1/fr
Expired 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 relates to a dishwashing machine having liquid level control means of the overflow type, as setforth in the preamble of claim 1.
  • a dishwashing machine having liquid level control means of this type is described in FR-A-1,385,971, wherein a first chamber adapted to be supplied with means water communicates via an overflow partition with a second chamber associated with a pressostat adapted to control a solenoid valve itself controlling the mains water supply.
  • the first chamber communicates, through the intake duct of a discharge pump, with the washing tub of a washing machine.
  • the mains water is supplied tothetub under the control ofthefirstchamber.
  • the second chamber is connected to the intake side of the discharge pump through a siphon-type conduit, so that both chambers of the level control means are effectively emptied as the water is discharged from the tub.
  • This control device is of simple construction and reliable and accurate operation, since, in contrast to other known devices of this type, the pressostat is not actuated by a gradually rising pressure, but by a sudden pressure variation occurring as the water overflows from the first to the second chamber, so as to ensure accurately timed operation.
  • the described level control device presents certain drawbacks, however, when employed in a dishwashing machine as in the preferred embodiment.
  • particulate impurities suspended in the water contained in the discharge circuit of the machine may enter the first chamber.
  • the first chamber is normally supplied with clean mains water, these impurities may be carried up to the overflow level so as to enter the second chamber to form a deposit therein which may, in the course of time, solidify and thus hamper the proper operation of the pressostat and/or prevent the second chamber from being completely emptied through the siphon-type conduit.
  • a substantially similar shortcoming affects a dishwashing machine of the type described in German patent application 2 439 400, wherein the intake duct of a discharge pump is connected to the tub of the machine and to a level control device including a first and a second chamber intercommunicating by means of an overflow device.
  • said overflow device comprises a siphon device through which the second chamber can be emptied by the discharge pump when this latter is in operation.
  • impurities suspended in the water can easily enter the second chamber and solidify therein, with the result that the proper operation of the whole level control device can be hampered in the long run.
  • a further object of the invention is the provision of a dishwashing machine of the type defined above having liquid level control means of the overflow type, which is of compact construction and may be integrated into the liquid collecting well of the dishwasher.
  • a dishwashing machine comprises a washing tub 4 (only partially shown) having at its bottom portion a well 5 for collecting the liquid the level of which is to be controlled.
  • Tub 4 is adapted to be filled with mains water up to a predetermined level 1 through a supply tube 6 provided with an actuatble supply valve 13 of a per se known type.
  • Tub 4 may be emptied in a conventional manner through a discharge pump 7 connected to a discharge conduit 17 down to a residual liquid level 3.
  • the bottom of well 5 is connected to pump 7 through an intake duct 8.
  • a circulation pump 9 is provided for spraying dishes and the like (not shown) with the water collected in well 5. During this phase the liquid in tub 4 drops to a dynamic level 2 in a known manner.
  • the dishwashing machine is also provided with liquid level control means comprising at least one first chamber 10 having a calibrated inlet 11 for mains water connected to a branch duct 12 of supply tube 6.
  • First chamber 10 is provided with at least one overflow arrangement 14 disposed at the predetermined level 1, by way of which it communicates with at least one second chamber 15 or overflow chamber.
  • a pressostat 16 or the like Associated to the latter is a pressostat 16 or the like adapted to be actuated when the liquid overflows from first chamber 10 into second chamber 15 for closing supplyvalve 13 in a perse known manner.
  • Aconnecting conduit 19 connects the bottom portion of first chamber 10 to intake duct 8, and through the latter, to tub 4.
  • Conduit 19 connects intake duct 8 also to second chamber 15 through a conventional siphon device 18 and a branch portion of first chamber 10.
  • the interior volume of connecting conduit 19 is at least equal to the volume of first chamber 10 between the predetermined overflow level 1 and dynamic level 2.
  • Connecting conduit 19 preferably offers a greater flow resistance to the flow of liquid than does intake duct 8. This requirement may obviously be met in various manner, for instance by forming conduit 19 with a contorted flowpath or by restricting its cross-sectional area.
  • first chamber 10 is preferably disposed at a higher level than the maximum residual liquid level 3 which the liquid remaining in tub 4 may attain after the discharge phase.
  • Connecting conduit 19 may not in any case be formed with vertical loops, as such loops would result in the undesirable formation of air locks.
  • pump 7 substantially empties tub 4, first chamber 10 and, through siphon 18, also the overflow chamber 15. During this phase pump 7 removes any impurities which may have accumulated within connecting conduit 19, so that major accumulations are prevented from forming therein in the course of repeated operating cycles of the machine.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (2)

1. Lave-vaisselle ayant des moyens pour régler le niveau d'un liquide dans une cuve de lavage (4) adaptée pour être remplie de ce liquide par l'intermédiare d'un tube d'alimentation (6) équipée d'une vanne d'alimentation commandable (13) et pour être pratiquement vidée lors d'une phase de vidange, ces moyens de réglage du niveau comprenant au moins une première chambre (10) raccordée à la cuve (4) au niveau de la portion inférieure de celle-ci disposée en-dessous d'un niveau résiduel (3) par l'intermédiaire du conduit d'admission (8) d'une pompe de vidange (7) et équipée d'une entrée (11) pour ce liquide raccordée au tube d'alimentation (6), la première chambre (10) communiquant avec au moins une deuxième chambre (15) par l'intermédiaire d'au moins une dispositif de débordement (14) pour permettre au liquide de déborder de la première chambre (10) dans la deuxième chambre (15) lorsque le liquide dans la cuve (4) atteint le niveau de débordement (1) du dispositif de débordement (14), des moyens sensibles à la pression (16) étant prévus pour fermer la vanne d'alimentation (13) lorsque le liquide déborde dans la deuxième chambre (15), ce liquide étant adapté pour tomber à un niveau dynamique (2) pendant au moins une phase du fonctionnement d'une pompe de circulation (9), cette deuxième chambre (15) étant raccordée à la première chambre (10) par l'intermédiaire d'un dispositif de siphon (18) afin de lui permettre de se vider, caractérisé en ce qu'il comporte un conduit de raccordement (19) entre le fond de la première chambre (10) et le conduit d'admission (8) de la pompe de vidange (7), le volume de ce conduit de raccordement (19) étant au moins égal au volume de la première chambre (10) compris entre le niveau de débordement (1) et le niveau dynamique (2), le fond de la première chambre (10) étant disposé à un niveau supérieur à un niveau de liquide résiduel (3) à l'intérieur de la cuve (4) après la phase de vidange.
2. Lave-vaisselle selon la revendication 1, caractérisé en ce que le conduit de raccordement (19) offre à l'écoulement du liquide une résistance plus élevée que le conduit d'admission (8) de la pompe de vidange (7).
EP85101458A 1984-02-13 1985-02-11 Lave-vaisselle à détecteur de niveau du type à trop-plein Expired EP0152893B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101458T ATE33927T1 (de) 1984-02-13 1985-02-11 Geschirrspueler mit niveauregelung nach dem ueberlaufprinzip.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8434009U IT8434009V0 (it) 1984-02-13 1984-02-13 Macchina lavastoviglie con controllo di livello del liquido del tipo a trabocco.
IT3400984U 1984-02-13

Publications (2)

Publication Number Publication Date
EP0152893A1 EP0152893A1 (fr) 1985-08-28
EP0152893B1 true EP0152893B1 (fr) 1988-05-04

Family

ID=11238584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101458A Expired EP0152893B1 (fr) 1984-02-13 1985-02-11 Lave-vaisselle à détecteur de niveau du type à trop-plein

Country Status (5)

Country Link
EP (1) EP0152893B1 (fr)
AT (1) ATE33927T1 (fr)
DE (1) DE3562450D1 (fr)
ES (1) ES283864Y (fr)
IT (1) IT8434009V0 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102006009787A1 (de) * 2006-03-01 2007-09-06 Miele & Cie. Kg Programmgesteuerte Spülmaschine mit Sicherheitsüberlauf

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1081082A (en) * 1963-03-15 1967-08-31 Hoover Ltd Improvements relating to level responsive arrangements
FR2241062B1 (fr) * 1973-08-17 1978-12-08 Europe Mfg Trust

Also Published As

Publication number Publication date
DE3562450D1 (en) 1988-06-09
ATE33927T1 (de) 1988-05-15
ES283864Y (es) 1986-04-16
IT8434009V0 (it) 1984-02-13
ES283864U (es) 1985-08-01
EP0152893A1 (fr) 1985-08-28

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