EP0152893A1 - 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
EP0152893A1
EP0152893A1 EP85101458A EP85101458A EP0152893A1 EP 0152893 A1 EP0152893 A1 EP 0152893A1 EP 85101458 A EP85101458 A EP 85101458A EP 85101458 A EP85101458 A EP 85101458A EP 0152893 A1 EP0152893 A1 EP 0152893A1
Authority
EP
European Patent Office
Prior art keywords
chamber
liquid
level
tub
discharge
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
EP85101458A
Other languages
German (de)
English (en)
Other versions
EP0152893B1 (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.
  • the invention concerns a dishwashing machine having liquid level control means of the type described in French Patent 1,385,971, wherein a first chamber adapted to be supplied with mains 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 to the tub under the control of the first chamber.
  • 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 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 dishwashing machine.
  • a dishwashing machine having liquid level control means for controlling the liquid level in a washing tub adapted to have such liquid supplied thereto through a supply tube provided with a supply control valve and adapted to be substantially emptied during at least one discharge phase.
  • Said level control means comprises at least one first chamber connected to said tub through the intake duct of a discharge pump and provided with a liquid inlet connected to said supply tube, said first chamber communicating with at least one second chamber via at least one overflow arrangement by way of which the liquid overflows from said first chamber into said second chamber when the liquid in said tub reaches a predetermined level.
  • a dishwashing machine of the type defined above is mainly characterized by comprising a connecting conduit between the bottom of said first chamber and the intake duct of the discharge pump.
  • the volume of said connecting conduit at least corresponds to the volume of said first chamber between said predetermined level and said dynamic level.
  • the bottom of said first chamber is disposed at a higher level than the level of the residual liquid in said tub after a discharge phase.
  • 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 actuatable 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 supply valve 13 in a per se known manner.
  • a connecting 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 manners, 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)
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 true EP0152893A1 (fr) 1985-08-28
EP0152893B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589262A1 (fr) * 1985-10-24 1987-04-30 Licentia Gmbh Procede et dispositif de remplissage d'une cuve
EP0248339A1 (fr) * 1986-06-04 1987-12-09 INDUSTRIE ZANUSSI S.p.A. Machine à laver avec dispositif de contrôle de l'alimentation en eau
EP1829472A1 (fr) * 2006-03-01 2007-09-05 Miele & Cie. KG Lave-vaisselle programmé doté d'une sécurité contre le débordement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294110A (en) * 1963-03-15 1966-12-27 Hoover Co Liquid level control
DE2439400A1 (de) * 1973-08-17 1975-03-13 Europe Mfg Trust Vorrichtung zur ueberwachung des fluessigkeitsstandes in einem behaelter, z.b. einer waschmaschine und insbesondere einer geschirrspuelmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294110A (en) * 1963-03-15 1966-12-27 Hoover Co Liquid level control
DE2439400A1 (de) * 1973-08-17 1975-03-13 Europe Mfg Trust Vorrichtung zur ueberwachung des fluessigkeitsstandes in einem behaelter, z.b. einer waschmaschine und insbesondere einer geschirrspuelmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589262A1 (fr) * 1985-10-24 1987-04-30 Licentia Gmbh Procede et dispositif de remplissage d'une cuve
EP0248339A1 (fr) * 1986-06-04 1987-12-09 INDUSTRIE ZANUSSI S.p.A. Machine à laver avec dispositif de contrôle de l'alimentation en eau
EP1829472A1 (fr) * 2006-03-01 2007-09-05 Miele & Cie. KG Lave-vaisselle programmé doté d'une sécurité contre le débordement

Also Published As

Publication number Publication date
IT8434009V0 (it) 1984-02-13
ES283864Y (es) 1986-04-16
ES283864U (es) 1985-08-01
EP0152893B1 (fr) 1988-05-04
DE3562450D1 (en) 1988-06-09
ATE33927T1 (de) 1988-05-15

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