EP0153655B1 - Lave-vaisselle à détecteur de niveau du type trop-plein - Google Patents

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

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Publication number
EP0153655B1
EP0153655B1 EP85101498A EP85101498A EP0153655B1 EP 0153655 B1 EP0153655 B1 EP 0153655B1 EP 85101498 A EP85101498 A EP 85101498A EP 85101498 A EP85101498 A EP 85101498A EP 0153655 B1 EP0153655 B1 EP 0153655B1
Authority
EP
European Patent Office
Prior art keywords
chamber
level
liquid
control means
overflow
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
EP85101498A
Other languages
German (de)
English (en)
Other versions
EP0153655A1 (fr
Inventor
Livio Furlan
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 AT85101498T priority Critical patent/ATE30838T1/de
Publication of EP0153655A1 publication Critical patent/EP0153655A1/fr
Application granted granted Critical
Publication of EP0153655B1 publication Critical patent/EP0153655B1/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 washing liquid level control means of the overflow type.
  • the invention concerns a dishwashing machine having liquid level control means of the type described in French Patent 1,385,971, in which a first chamber adapted to be supplied with mains water communicates via an overflow partition with a second chamber associated with pressure sensitive means like a so- called pressostat adapted to control a solenoid valve itself adapted to control the supply of the mains water.
  • the first chamber also communicates through the intake duct of a discharge pump with the washing tub of a washing machine.
  • the mains water is supplied to the washing tub, and at the same time to the first chamber until the water level has risen to the height of the overflow partition, whereupon the water overflows from the first chamber into the second chamber, thereby actuating the pressostat for causing the solenoid supply valve to close.
  • 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 when the washing liquid is discharged from the tub.
  • This control means is of simple construction and reliable and accurate operation, because the pressostat (in contrast to other known constructions) is not actuated by a gradually increasing pressure, but by a sudden pressure variation (occurring when the water overflows from the first into the second chamber), so that its control function is very accurately timed.
  • This level control means presents certain drawbacks, however, when employed in a dishwashing machine, as in the invention.
  • a dishwashing machine provided with means for controlling the level of a liquid in a washing tub adapted to be supplied with such liquid via a supply tube provided with an actuatable supply valve.
  • the level control means comprises at least one first chamber connected to the tub through the intake duct of a discharge pump and provided with a liquid inlet connected to the supply tube, said first chamber communicating with at least one second chamber via at least one overflow arrangement by way of which said liquid overflows from the first chamber to the second chamber when the liquid in the tub reaches a predetermined level.
  • Pressure-sensitive means is provided for controlling the closing operation of the supply valve when the liquid overflows into the second chamber.
  • a dishwashing machine of the type defined above is characterized in that the first chamber is provided with at least one hood member for intercepting particulate matter suspended in the liquid to be controlled.
  • the hood member is positioned over the opening between said first chamber and said intake duct and so as to substantially face said inlet at a level between that of the intake duct of the discharge pump and the predetermined overflow level.
  • a dishwashing machine comprises a washing tub 4 (only partially shown), the bottom of which is formed with a well 5 for collecting a liquid the level of which is to be controlled.
  • Tub 4 is adapted to be supplied with mains water through a supply tube 6 provided with a supply valve 13 controlled in a per se known manner.
  • Tub 4 is further adapted to be emptied in a conventional manner by means of a discharge pump 7 and a discharge conduit 17.
  • a circulation pump 9 is provided for spraying the dishes and the like (not shown) to be cleaned with water collected in well 5.
  • the machine is also provided with level control means comprising at least one first chamber 10 having a calibrated mains water inlet 11 connected to an upwards extending branch conduit 12 of supply tube 6.
  • Chamber 10 is provided with at least one overflow arrangement 14 disposed at a predetermined level 1, by way of which first chamber 10 communicates with at least one second chamber or overflow chamber 15, the latter being associated with a pressostat 16 or the like adapted to be actuated in response to the liquid overflowing from first chamber 10 into second chamber 15 for causing supply valve 13 to close in a per se known manner.
  • first chamber 10 The bottom portion of first chamber 10 is connected to tub 4 via intake duct 8 of discharge pump 7.
  • Overflow chamber 15 is likewise connected to intake duct 8 through a siphon device 18 and a branch portion of first chamber 10 in a per se known manner.
  • the first chamber 10 of the level control means is provided with a hood member 19 disposed substantially in facing relationship to inlet 11 and preferably formed integrally with the remainder of the described structure.
  • hood member 19 is disposed at a level between that of intake duct 8 of discharge pump 7 and the predetemined overflow level 1.
  • supply valve 13 is open during the water supply phase, so that the mains water simultaneously flows into well 5 and first chamber 10, gradually rising to the predetermined overflow level 1, as described above.
  • Stoppage of circulation pump 9 causes the water to rise again to the overflow level 1 resulting in water flowing from tub 4 into chamber 10 in accordance with the law of communicating tubes. As a result, particulate matter suspended in the water flowing back from the discharge circuit of the machine may enter first chamber 10 from intake duct 8.
  • a similar phenomenon may occur for example towards the end of a supply phase following a discharge phase, i.e. at a time when there may be a particularly high concentration of particulate matter in intake duct 8.
  • the particulate matter having entered first chamber 10 in suspension would tend to rise to the overflow level 1, but is prevented from doing so by hood member 19 so as to collect on the interior surface thereof.
  • discharge pump 7 in the known manner causes the liquid to be evacuated from tub 4, first chamber 10 and, thanks to siphon device 18, from overflow chamber 15.
  • hood member 19 At the beginning of each supply phase the interior of hood member 19 is automatically cleaned by the jet of fresh water produced by branch conduit 12 of supply tube 6. This jet impinges on the interior surface of hood member 19, so that particulate matter possibly adhering thereto is carried away be gravity towards intake duct 8 and tub 4 which had previously been emptied.
  • hood member 19 is self-cleaning and highly efficient in intercepting suspended particulate matter, so that the latter is prevented from overflowing into second chamber 15 and thus from interfering with the proper operation of the level control means, in accordance with the stated object of the invention.
  • flooding prevention safety means comprising for instance a further overflow arrangement 20 disposed at a level 3 above overflow level 1.
  • first chamber 10 communicates with a further overflow chamber 21 associated with a pressure-sensitive element 22 adapted to be actuated for instance for closing supply valve 13 in a per se known manner, preferably by mechanical means.
  • Element 22 may thus intervene, for instance, during a water supply phase when pressostat 16 fails to operate.
  • Chamber 21 may then be manually emptied by means of a drain valve 23 or the like.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Control Of Non-Electrical Variables (AREA)

Claims (1)

  1. Machine à laver la vaisselle ayant des moyens de régulation du niveau d'un liquide dans une cuve de lavage (4) adaptée pour être alimentée en liquide par l'intermédiaire d'un tube d'alimentation (6) équipé d'une vanne d'alimentation pouvant être commandée (13), ces moyens de régulation du niveau comportant au moins une première chambre (10) raccordée à la cuve (4) par l'intermédiaire du conduit d'admission (8) d'une pompe de vidange (7) et équipée d'une arrivée (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 un agencement de débordement (14) grâce auquel le liquide passe par débordement de la première chambre (10) dans la deuxième chambre (15) en réponse à l'atteinte d'un niveau de liquide prédéterminé (1) dans la cuve (4), un élément sensible à la pression (16) étant prévu pour provoquer la fermeture de cette vanne d'alimentation (13), en réponse au débordement du liquide dans la deuxième chambre (15), caractérisée en ce que la première chambre (10) est équipée d'au moins un capot (19) pour intercepter les matières en particules en suspension dans le liquide dont le niveau doit être réglé, ce capot étant disposé au-dessus de l'ouverture entre la première chambre (10) et le conduit d'admission (8), en se trouvant pratiquement en vis-à-vis par rapport à l'arrivée (11) à un niveau compris entre celui du conduit d'admission (8) de la pompe de vidange (7) et le niveau de débordement prédéterminé (1).
EP85101498A 1984-02-13 1985-02-12 Lave-vaisselle à détecteur de niveau du type trop-plein Expired EP0153655B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101498T ATE30838T1 (de) 1984-02-13 1985-02-12 Geschirrspueler mit niveauregelung nach dem ueberlaufprinzip.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8434008U IT8434008V0 (it) 1984-02-13 1984-02-13 Macchina lavastoviglie con controllo di livello del liquido del tipo a trabocco.
IT3400884U 1984-02-13

Publications (2)

Publication Number Publication Date
EP0153655A1 EP0153655A1 (fr) 1985-09-04
EP0153655B1 true EP0153655B1 (fr) 1987-11-19

Family

ID=11238573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101498A Expired EP0153655B1 (fr) 1984-02-13 1985-02-12 Lave-vaisselle à détecteur de niveau du type trop-plein

Country Status (5)

Country Link
EP (1) EP0153655B1 (fr)
AT (1) ATE30838T1 (fr)
DE (1) DE3560982D1 (fr)
ES (1) ES283863Y (fr)
IT (1) IT8434008V0 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207040A (en) * 1987-07-23 1989-01-25 Unilever Plc Warewashing machine with siphon overflow pipe
FR2608413A1 (fr) * 1987-08-17 1988-06-24 Guerit Berthile Machine mixte a laver les verres et la vaisselle

Family Cites Families (1)

* 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

Also Published As

Publication number Publication date
IT8434008V0 (it) 1984-02-13
ATE30838T1 (de) 1987-12-15
EP0153655A1 (fr) 1985-09-04
DE3560982D1 (en) 1987-12-23
ES283863U (es) 1985-12-01
ES283863Y (es) 1986-06-16

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