EP0755651B1 - Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine - Google Patents

Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine Download PDF

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Publication number
EP0755651B1
EP0755651B1 EP19960201808 EP96201808A EP0755651B1 EP 0755651 B1 EP0755651 B1 EP 0755651B1 EP 19960201808 EP19960201808 EP 19960201808 EP 96201808 A EP96201808 A EP 96201808A EP 0755651 B1 EP0755651 B1 EP 0755651B1
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EP
European Patent Office
Prior art keywords
tank
liquid
level
baffle
washing
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
EP19960201808
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English (en)
French (fr)
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EP0755651A2 (de
EP0755651A3 (de
Inventor
Silvano Fumagalli
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.)
Candy SpA
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Candy SpA
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Publication date
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Publication of EP0755651A3 publication Critical patent/EP0755651A3/de
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Publication of EP0755651B1 publication Critical patent/EP0755651B1/de
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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 control device for loading differentiated volumes of washing liquid in a dishwashing machine.
  • the abovementioned control device comprises a single block wherein there are obtained: a first tank supplied by a flow of Liquid partialized by means of a nozzle with respect to the main flow that supplies the tank directly; a pressostatic chamber associated with the first tank that, when the level of the liquid in the first tank exceeds a given level (coincident with the level of liquid that it is desired to have in the tank) is filled by the liquid that overflows from the first tank to determine the activation of a pressure switch, which interrupts the introduction of liquid; a second tank also supplied by a flow of liquid partialized with respect to said main flow; a first and a second syphon-like conduit associated with said second tank both running into the first tank.
  • the bottom of the first tank is connected to the bottom of the washing tank by means of a one-way valve that allows the passage of the liquid from the first tank to the washing tank, but not vice versa.
  • the liquid that is supplied as an offtake from the main flow to the first tank flows into the washing tank, keeping the one-way valve open, so that the washing tank and the first tank form two communicating vessels: the level of the liquid in the washing tank is thus always coincident with the level of the liquid in the first tank, so that when the level of the liquid in the tank reaches the desired value, the liquid in the first tank overflows into the pressostatic chamber determining the activation of the pressure switch.
  • the first tank thus constitutes a system for controlling the level.
  • the second tank and the two syphon-like conduits constitute a system of volumetric control, of the type described for example in the Italian patent application No. MI94A000353 again in the name of the same applicant, that allows the introduction of liquid into the tank to be cut off when a given quantity of liquid has been loaded into the second tank.
  • the first syphon-like conduit is automatically triggered when the level of the liquid in the second tank reaches a first level, and once it is triggered it transfers all the liquid present in the second tank into the first tank, determining the overflow of the liquid in the first tank into the pressostatic chamber and the intervention of the pressure switch.
  • the second syphon-like conduit has a triggering level that is higher than the triggering level of the first syphon-like conduit.
  • first syphon-like conduit With the first syphon-like conduit there is also associated a solenoic valve that is kept closed (so as to prevent the triggering of the first syphon-like conduit) when it is desired that the second syphon-like conduit trigger, while it is kept open when when it is desired that the first syphon-like conduit trigger. In this way it is possible to execute differentiated loadings of volumes of liquid.
  • the described device is somewhat complex, as it requires the presence of two syphon-like conduits with differentiated triggering levels.
  • the object of the present invention is to provide a control device that has the same functional features of the device according to the state of the art described above, but that has a simpler structure.
  • a device for controlling the loading of washing liquid in a dishwashing machine comprising a first tank arranged in such a way as to take off the supply of liquid by a solenoid valve for supplying a washing tank of the dishwashing machine so as to receive a smaller first fraction of said liquid, connecting means that keep said first tank in communication with said washing tank during the loading of the washing liquid so that the level of the liquid in the first tank coincides with the level of the liquid in the washing tank, level detection means associated with said first tank to perform the closing of the supplying solenoid valve when the level of the liquid in the first tank and in the washing tank exceeds a first predetermined level, a second tank being arranged as an take off tank for the supply of liquid by the supplying solenoid valve so as to receive a smaller second fraction of said liquid, and a syphon-like conduit associated with said second tank that is triggered when the level of the liquid in the second tank reaches a second prescribed level so as to transfer the liquid present
  • the control device allows a check both of the volumetric type and of the level of the volume of liquid loaded into the washing tank of the dishwashing machine, also allowing the loading into the tank of differentiated volumes of liquid without, on the other hand, requiring, as in the case of the device according to the known art, the presence of two syphon-like conduits with differentiated triggering levels.
  • the control device according to the invention thus has a simpler structure.
  • a washing tank 1 of a dishwashing machine On the bottom of the tank 1 there is a sump 2, that communicates with the washing tank 1 through a filtering plate 3. To the sump 2 there are also connected a washing pump that supplies a pair of distribution rotors (not shown) inside the washing tank 1, and a discharge pump (also not shown) to discharge the liquid present in the tank 1.
  • a supplying solenoid valve 4 connected to a conduit for supplying clean water.
  • the water is sent, by means of a conduit 5, directly into the sump 2, from which the water flows into the washing tank 1.
  • the water issuing from the supplying solenoid valve 4 is also sent, by means of a conduit 6 as an offtake to the conduit 5, to a device 7 for controlling the quantity of water loaded into the washing tank 1.
  • the control device 7 is preferably made in the form of a single block comprising a first tank 8, a pressostatic chamber 9 associated with the first tank 8 and connected to a pressure switch 10, a first loading column 11 with a partializing nozzle 12 opposite the point where it connects with the conduit 6, said loading column 11 opening at its upper end into the first tank 8, a baffle 13 that separates the first tank 8 from the pressostatic chamber, so that the water present in the first tank 8 overflows into the pressostatic chamber 9 when it reaches a level L1 (that, as will be seen later, coincides with the level of water that it is desired to have in the tank 1), a syphon 14 that places the bottom of the pressostatic chamber 9 in communication with the bottom of the first tank 8.
  • the control device 7 also comprises a second tank 16, or measuring tank, to which there is connected a second loading column 17 provided at its mouth with a partializing nozzle 18.
  • a syphon-like conduit 19 has a mouth placed opposite the bottom of the tank 16, it extends almost to the top of the tank 16, it bends like an elbow and descends again until it reaches the upper part of the first tank 8.
  • From an upper wall 51 of the second tank 16 there extend vertically downward a first baffle 20 and a second baffle 21; the baffle 20 defines with the walls of the tank 16 a portion of tank A; the baffle 21 extends downward for a part that is greater than the baffle 20.
  • a solenoid valve mounted outside the control device 7, controls the opening or the closing of said aperture 22.
  • a conduit 90 places the sump 2 in communication with a column 91 obtained in the tank 8; between the loading column 11 and the loading column 17 there is also obtained a safety column 70, with a height equal to that of the column 91, connected to a safety block pressostatic device (not shown) that equips the supplying solenoid valve 4.
  • the control device 7 operates in the following manner.
  • a programming unit or timer that governs the dishwashing machine determines the opening of the supplying solenoid valve 4; water is sent directly to the sump 2, and then to the washing tank 1, through the conduit 5. A fraction of the water is, however, sent, through the conduit 6, the partializing nozzle 12 and the loading column 11, to the first tank 8, from which the water then flows, through the conduit 15 and the one-way valve 50, to the sump 2 and then to the tank 1; the one-way valve 50 is kept open by the flow of water from the first tank 8, and thus the tank 1 and the first tank 8 constitute communicating vessels: the level of the water in the washing tank 1 thus coincides with the level of the water in the first tank 8.
  • the water in the first tank 8 overflows into the pressostatic chamber 9 (because the baffle 13 that separates the pressostatic chamber 9 from the first tank 8 extends up to the height above ground corresponding to the level L1).
  • the pressure of the air in the pressostatic chamber 9 determines the intervention of the pressure switch 10, that drives the closing of the supplying solenoid valve 4.
  • the first tank 8, the pressostatic chamber 9 and the pressure switch 10 constitute a control system operating on the level of the water in the tank 1.
  • this system can be influenced by the imperfect planarity of the dishwashing machine.
  • the device 7 also comprises a control system of the volumetric type, consisting of the second tank 16 and of the syphon-like conduit 19.
  • a fraction of water is also supplied, through the partializing nozzle 18 and the loading column 17, to the second tank 16. Supposing for a moment that the solenoid valve 23 is kept in the position wherein the aperture 22 is open, the water inside the tank 16 goes on to occupy the entire volume of the tank itself, except for a small portion of tank B defined by the baffle 20, by the baffle 21 and by the upper wall 51 of the tank 16.
  • the solenoid valve 23 is in the position wherein the aperture 22 is closed, as shown in Fig. 2, the water inside the tank 16 cannot occupy a portion of the tank having a volume equal to the sum of the volumes of the portions A and B described earlier, and of the volume of a portion C included between the part of baffle 21 that extends beyond the baffle 20 and the side wall of the tank 16, due to the pressure of the air present in said portion of tank that finds no way of escape.
  • the triggering level L2 of the syphon-like conduit 19 is thus reached when a sufficient quantity of water has been loaded into the tank 16 that is less than in the previous case.
  • the triggering of the syphon-like conduit 19 determines the rapid transfer of the water present in the second tank 16 to the first tank 8, determining the rapid overflow of the latter into the pressostatic chamber 9 and thus the intervention of the pressure switch 10 that determines the closing of the supplying solenoid valve 4. Since the quantity of water that is loaded into the second tank 16 is a fraction of that which is loaded into the washing tank 11, in this second case where the aperture 22 is closed the supplying solenoid valve 4 is closed when a quantity of water has been loaded into the tank 1 that is less than in the previous case wherein the aperture 22 was open (for example, 3.5 l against the 4.5 l of the previous case), corresponding to a tank level L3. A controlled loading has thus been achieved of a partial volume of washing liquid, useful for example when a reduced load of dishes is to be washed.
  • FIG. 3 There is shown in Fig. 3 the case wherein a volume of liquid is to be loaded into the tank 1 that is intermediate between the maximum one (Fig. 1) and the reduced one (Fig. 2), corresponding to a level L4 in the tank.
  • the tank 16 is provided on its upper wall 51, in an area between the baffles 20 and 21, with a venting appendix 55 that is normally closed, but that can be opened by hand (for example, by cutting off its upper end) so that when the solenoid valve 23 is in the position wherein the aperture 22 is closed, the only portion of the tank 16 that is not filled with water is the portion A, while portions B and C can be filled.
  • the level L2 in the tank 16 (the level at which the syphon-like conduit 19 is triggered) is reached when a volume of water has been loaded into the tank 16 (and correspondingly into the tank 1) that is less than in the case of Fig. 1, but more than in the case of Fig. 2.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Claims (8)

  1. Vorrichtung zum Steuern der Aufgabe von Spülflüssigkeit in einer Geschirrspülmaschine, welche einen ersten Behälter (8) aufweist, welcher derart angeordnet ist, dass ein Flüssigkeitsvorrat mittels eines Magnetventils (4) zur Versorgung eines Spülbehälters (1) einer Geschirrspülmaschine abgezogen wird, um einen kleineren ersten Teil der Flüssigkeit aufzunehmen, ferner Verbindungseinrichtungen (15, 50) aufweist, welche den ersten Behälter (8) in kommunizierender Verbindung mit dem Spülbehälter (1) während der Aufgabe der Spülflüssigkeit derart halten, dass der Flüssigkeitspegel im ersten Behälter (8) mit dem Flüssigkeitspegel in dem Spülbehälter (1) übereinstimmt, Pegeldetektionseinrichtungen (9, 10, 13) vorgesehen sind, die mit dem ersten Behälter (8) verbunden sind, um ein Schließen eines Zuführungsmagnetventils (4) zu veranlassen, wenn der Flüssigkeitspegel in dem ersten Behälter (8) und in dem Spülbehälter (1) einen ersten vorbestimmten Pegelwert (L1) überschreitet, ein zweiter Behälter (16) derart vorgesehen ist, dass zur Flüssigkeitsversorgung durch das Zufuhrmagnetventil (4) Flüssigkeit abgezogen wird, um einen kleineren zweiten Teil der Flüssigkeit aufzunehmen, und eine syphonähnliche Leitung (19) mit dem zweiten Behälter (16) verbunden ist, welche derart geschaltet ist, dass dann, wenn der Flüssigkeitspegel in dem zweiten Behälter (16) einen zweiten vorbestimmten Pegelstandswert (L2) erreicht, die in dem zweiten Behälter (16) vorhandene Flüssigkeit vollständig in den ersten Behälter (8) übergeben wird, um die Aktivierung der Pegeldetektionseinrichtung (9, 10, 13) auszulösen, dadurch gekennzeichnet, dass der zweite Behälter (16) mit einer ersten Zwischenwand (20, 21) versehen ist, welche einen Teil des zweiten Behälters (A, C) umschreiben kann, und dass eine Entlüftungseinrichtung (22, 23) mit dem Abschnitt des Behälters (A, C) verbunden ist, welche geöffnet oder geschlossen werden kann, um jeweils im offenen oder geschlossenen Zustand die Flüssigkeit zum Auffüllen dieses Abschnitts des Behälters (A, C) durchzulassen oder das Durchlassen zu verhindern, so dass der zweite vorbestimmte Pegelstandswert (L2) erreicht wird, wenn ein erstes oder ein zweites Flüssigkeitsvolumen jeweils in dem zweiten Behälter (16) vorhanden ist, wobei das erste Flüssigkeitsvolumen größer als das zweite Flüssigkeitsvolumen ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Pegeldetektionseinrichtung (9, 10, 13) eine pressostatische Kammer (9) aufweist, welche mit einem Druckschalter (10) verbunden ist, welcher aktiviert wird, wenn der Luftdruck in der pressostatischen Kammer (9) einen vorbestimmten Wert überschreitet, um das Schließen des Zufuhrmagnetventils (4) auszulösen, wobei die pressostatische Kammer (9) von dem ersten Behälter (8) durch eine zweite Zwischenwand (13) getrennt ist, welche eine Höhe hat, die gleich der Höhe des ersten vorbestimmten Pegelstandwerts (L1) ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Entlüftungseinrichtung (22, 23) eine Entlüftungsöffnung (22) aufweist, welche in etwa an der Oberseite des Abschnitts des zweiten Behälters (A, C) angeordnet ist, und eine Ventileinrichtung (23) aufweist, welche die Entlüftungsöffnung (22) öffnen und verschließen kann.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Ventileinrichtung (23) ein Magnetventil aufweist.
  5. Vorrichtung nach einem der vorangehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die erste Zwischenwand (20, 21) eine dritte Zwischenwand (20) und eine vierte Zwischenwand (21) aufweist, die dritte Zwischenwand (20) vertikal von einer oberen Wand (51) des zweiten Behälters (16) über einen ersten Teil hinweg verläuft und eine Seitenwand des Behälters (16) einen ersten Abschnitt des zweiten Behälters (A) umgibt, und die vierte Wand (21) vertikal von der oberen Wand (51) über einen Bodenteil hinweg verläuft, welches größer als das erste Teil ist und einen zweiten Abschnitt des zweiten Behälters (B) umgibt, welcher zwischen der dritten Zwischenwand (20) und der vierten Zwischenwand (21) eingeschlossen ist, sowie zwischen einem dritten Teil des zweiten Behälters (C) unterhalb des ersten Abschnitts (A) und des zweiten Abschnitts (B) des zweiten Behälters eingeschlossen ist.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Entlüftungseinrichtung (22, 23) mit der Seitenwand des zweiten Behälters (16) im wesentlichen an der Oberseite des ersten Abschnitts des zweiten Behälters (A) verbunden ist.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Entlüftungseinrichtung (22, 23) im Schließzustand verhindert, dass die Flüssigkeit in dem Behälter (16) den ersten Abschnitt (A), den zweiten Abschnitt (B) und den dritten Abschnitt (C) des Behälters ausfüllt.
  8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass an der Oberseite des zweiten Abschnitts des Behälters (B) zweite Entlüftungseinrichtungen (55) vorgesehen sind, welche mittels Hand geöffnet werden können, um zu ermöglichen, dass dann, wenn die Entlüftungseinrichtung (22, 23) geschlossen ist, die Flüssigkeit in dem zweiten Behälter (16) den zweiten Abschnitt (B) und den dritten Abschnitt (C) des zweiten Behälters ausfüllt, so dass der zweite, vorbestimmte Pegelstandswert (L2) erreicht wird, wenn in dem zweiten Behälter (16) ein drittes Flüssigkeitsvolumen vorhanden ist, welches zwischen dem ersten Flüssigkeitsvolumen und dem zweiten Flüssigkeitsvolumen liegt.
EP19960201808 1995-07-27 1996-06-29 Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine Expired - Lifetime EP0755651B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950558U 1995-07-27
IT95MI000558 IT237085Y1 (it) 1995-07-27 1995-07-27 Dispositivo di controllo per il carico di volumi differenziati diliquido di lavaggio in una lavastoviglie

Publications (3)

Publication Number Publication Date
EP0755651A2 EP0755651A2 (de) 1997-01-29
EP0755651A3 EP0755651A3 (de) 1999-03-24
EP0755651B1 true EP0755651B1 (de) 2002-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960201808 Expired - Lifetime EP0755651B1 (de) 1995-07-27 1996-06-29 Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine

Country Status (3)

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EP (1) EP0755651B1 (de)
ES (1) ES2184830T3 (de)
IT (1) IT237085Y1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1291035B1 (it) * 1997-02-18 1998-12-14 Prealpina Tecnoplastica Sistema per il caricamento e il dosaggio del liquido di lavaggio in una lavastoviglie.
IT1291036B1 (it) * 1997-02-18 1998-12-14 Prealpina Tecnoplastica Sistema di dolcificazione dell'acqua in una macchina lavastoviglie.
IT1298176B1 (it) * 1998-01-22 1999-12-20 Smeg Spa Dispositivo per controllare e ripristinare il livello di acqua in una macchina lavastoviglie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1273347B (it) * 1994-02-28 1997-07-08 Candy Spa Dispositivo per il controllo del livello del liquido di lavaggio in una lavastoviglie
IT1271021B (it) * 1994-10-20 1997-05-26 Candy Spa Dispositivo di controllo del carico di liquido di lavaggio in una lavastoviglie

Also Published As

Publication number Publication date
EP0755651A2 (de) 1997-01-29
EP0755651A3 (de) 1999-03-24
ES2184830T3 (es) 2003-04-16
ITMI950558V0 (it) 1995-07-27
IT237085Y1 (it) 2000-08-31
ITMI950558U1 (it) 1997-01-27

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