EP0710464B1 - Dispositif de contrÔle de l'approvisionnement en liquide de lavage d'un lave-vaisselle - Google Patents

Dispositif de contrÔle de l'approvisionnement en liquide de lavage d'un lave-vaisselle Download PDF

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Publication number
EP0710464B1
EP0710464B1 EP95202782A EP95202782A EP0710464B1 EP 0710464 B1 EP0710464 B1 EP 0710464B1 EP 95202782 A EP95202782 A EP 95202782A EP 95202782 A EP95202782 A EP 95202782A EP 0710464 B1 EP0710464 B1 EP 0710464B1
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EP
European Patent Office
Prior art keywords
liquid
tank
level
feed
tub
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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
EP95202782A
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German (de)
English (en)
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EP0710464A1 (fr
Inventor
Silvano Fumagalli
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Candy SpA
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Candy SpA
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Application filed by Candy SpA filed Critical Candy SpA
Publication of EP0710464A1 publication Critical patent/EP0710464A1/fr
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Expired - Lifetime legal-status Critical Current

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    • 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 device for controlling the feed of washing liquid in a dishwasher machine.
  • Known control devices are substantially of three types: those for direct control in the tub, partialising ones and volumetric ones.
  • a pressure chamber is located at the top of a liquid column leading into the washing tub, so that the pressure in the pressure chamber is proportional to the level of liquid in the tub.
  • the pressure chamber is connected to a pressure switch which, when the pressure exceeds a given value, interrupts the flow of liquid in the tub.
  • a problem affecting the systems of direct control in the tub lies in the possibility of the dirt and greasy deposits incorporated in the washing liquid causing clogging of the column whereto the pressure chamber is connected and the loss of efficacy of the control device.
  • a “partialising” control device is for example described in the Italian patent application no. MI92A000957; the device comprises a measuring tank branching off at the water feed pipe from a feed solenoid valve to the washing tub.
  • the flow of water entering the dishwasher is divided between the washing tub and the measuring tank (thus the term “partialiser”); a pressure switch detects the level of the water in the measuring tank (a level which is proportional to the level in the tub and which is translated into the pressure of the air inside the tank) and interrupts the inflow of water, closing the solenoid valve, when this level reaches the required value.
  • a solenoid valve In order to prevent, after closure of the feed solenoid valve, the measuring tank from emptying into the tub and disabling the pressure switch (which would delete the memory of the device and allow a new feed of water by manual operation), a solenoid valve must be provided between the measuring tank and the tub, which solenoid valve is only opened when water is discharged from the tub.
  • a "volumetric" control device is for example described in the Italian patent application no. MI94A000353.
  • the liquid is fed by the decanting principle, feeding specific volumes of liquid into a measuring tank and decanting the liquid into the washing tub. Therefore a control is not kept of the effective level of liquid in the tub, but instead of the volume of liquid which is fed.
  • the object of the present invention is that of providing a new type of device for controlling the feed of washing liquid in a dishwasher.
  • a device for controlling the feed of washing liquid in a dishwasher comprising a first tank connected to a feed solenoid valve for supplying of liquid to a washing tub of the dishwasher so as to receive a first smaller fraction of said liquid, and level detector means connected to said first tank for commanding closure of the feed solenoid valve when the level of liquid in said first tank exceeds a first preset level, characterised in that said first tank is connected to the washing tub by valve means suitable for allowing the passage of a flow of liquid from the first tank to the tub but not vice versa and which, during the feed of liquid, are maintained open by the flow of liquid which flows from the first tank to the tub, until the level of liquid in the tub coincides with the level of liquid in the first tank, said first preset level being the level of liquid which is required in the washing tub at the end of the feed.
  • control device substantially of the partialising type, wherein however the closure of the feed solenoid valve is linked to the preset level of liquid being reached in the tub, similarly to the process in devices for direct control in the tub.
  • the presence of the valve means which allow the liquid to pass only from the tank to the tub prevents the dirt and greasy residues in the washing liquid from clogging the control device.
  • a washing tub 1 of a dishwasher is shown, partially sectioned along a vertical plane.
  • the tub 1 is enclosed in a framework 2 forming the external casing of the dishwasher.
  • a feed solenoid valve 3 mounted externally to a pipe for feeding clean water (not shown in that known).
  • a sump 5 is mounted in a known manner and has a substantially elliptic shape ( Figure 2). This leads into the washing tub 1 via a filtering plate 6.
  • the sump 5 is connected to a washing pump and a drain pump (not shown in that known); the washing pump feeds spraying rotors positioned inside the washing tub 1.
  • the clean water is sent, via a conduit 6, to a mandatory air break device 7, and from the latter to a decalcifier (neither shown in that known and for example described in detail in the patent application no. MI94A000353).
  • the decalcified water flows out from the decalcifier 8 and is sent, via a conduit 9, to the bottom of the sump 5.
  • a partialising nozzle also branches off at the conduit 9, via which nozzle the decalcified water is fed to a device for controlling the feed of water in the tub 1.
  • the control device substantially comprises a tank 12 with an associated pressure chamber 13 which is connected to a pressure switch 14.
  • a conduit 18 connects the partialising nozzle 10 to the base of a feed column 19 formed in the tank 12 and having the function of preventing, during feeding of the tank 12, the water from creating foam.
  • the feed column 19 leads at its top into the tank 12 via an opening 20.
  • Inside the tank 12 there is also a baffle 17 which extends from the bottom of the tank 12 to a predefined height, which height, when the tank is installed on the dishwasher, coincides with the level of water L1 ("static" level) which is required in the washing tub 1.
  • the bottom of the tank 12 is connected to the sump 5 by means of a conduit 15 and a check valve 16 which engages horizontally in a vertical wall of the sump 5.
  • the check valve 16 is such as to allow water to flow only in the direction which goes from the conduit 15 to the sump 5, and not in the opposite direction.
  • the check valve 16 leads into a chamber 11 of the sump 5 having a calibrated surface for the passage of water (Fig. 2) for reasons which are to be explained hereinunder.
  • Figure 2 also shows how the tank 12 and the associated pressure chamber 13 are usefully housed in a cavity 50 between a vertical wall of the washing tub 1 and a vertical wall of the framework 2, in order not to cause increases in the overall dimensions of the dishwasher.
  • a programming device or timer causes in a manner in itself known opening of the feed solenoid valve 3.
  • the flow of water which arrives directly in the sump 5 initially fills the latter, and then rises through the opening 4 into the tub 1.
  • the level of water in the tub 1 then rises gradually.
  • the partial flow of water which feeds the tank 12 also flows, via the conduit 15 and the check valve 16, into the sump 5, in that said flow maintains the check valve 16 open.
  • the check valve 16 Given that during the phase of water feed the check valve 16 is kept open, the tank 12 and the washing tub 1 form two basins connected at the bottom: the level of water in the washing tub 1 thus rises simultaneously to the level of water in the tank 12.
  • a safety column 21 is also provided in the tank 12 and leads into the tank 12 via an opening 22 at a height corresponding to the reaching in the tub 1 of a warning level L2.
  • the safety column 21 is connected via a conduit 24 to a safety lock pressure switch device 23 on the solenoid valve 3.
  • the vacuum created in the sump 5 by the drain pump causes opening of the check valve 16, and triggering of a siphon pipe 25 which empties the pressure chamber 13, in order to restore the original conditions for a subsequent feed phase.
  • operation of the control device is affected by the imperfect horizontal arrangement of the dishwasher: in fact, since triggering of the pressure switch 14 is linked to the water in the tank 12 reaching the top of the baffle 17, it is clear how, if the dishwasher is tilted to the right in Figure 1, water will overflow from the tank 12 to the pressure chamber 13 when a larger quantity of water than the predefined quantity has been fed, whereas if the dishwasher is tilted to the left in Figure 1, water will overflow from the tank 12 to the pressure chamber 13 when a smaller quantity of water than the predefined quantity has been fed.
  • Figure 3 shows a control device according to a second embodiment of the present invention, whose operation is not affected by the imperfect horizontal arrangement of the dishwasher.
  • the control device again comprises the tank 12, fed via the conduit 18 branching off at the conduit 9, and the check valve 16, which is however inserted vertically in the base of the sump 5.
  • a tank 30 is also provided and fed via a conduit 32 and a second partialising nozzle 31, also branching off at the conduit 9.
  • the tank 30 is provided with two siphon pipes 33 and 34, having mouths at the base of the tank 30, and different trigger levels LI and LI', which both flow into the tank 12. Opening of the mouth of the siphon pipe 34 is controlled by a solenoid valve 35 (Fig. 4).
  • the feed solenoid valve 3 When the feed solenoid valve 3 is open, the clean and decalcified water is fed to the tub 1 and, via the partialising nozzles 10 and 31 and the conduits 18 and 32, to the tank 12 and to the tank 30.
  • the water entering the tank 12 flows, via the conduit 15 and the check valve 16, into the sump 5, and the level of water in the tank 12 rises together with that in the tub 1.
  • the level of water in the tank 30 also rises.
  • the solenoid valve 22 Assuming that the solenoid valve 22 is closed, when the water in the tank 18 has reached the trigger level L1 of the siphon pipe 33, the latter starts to discharge water rapidly in the tank 12.
  • the volume of the tank 30 and the diameter of the partialising nozzle 31 are chosen so that the siphon pipe 33 triggers when a level slightly lower than the required static level L1 has been reached in the tub 1.
  • the water transferred by the siphon pipe 33 into the tank 12 makes the latter overflow into the pressure chamber 13 and trips the pressure switch 14, which causes closure of the feed solenoid valve 3.
  • the intervention of the pressure switch 14 is no longer linked, as in the previous case, to reaching in the tub 1 of the level L1 which causes water to overflow from the tank 12 to the pressure chamber 13, but instead when the trigger level L1 of the siphon pipe 33 is reached in the tank 30, which occurs when a fully defined volume of water has been fed into the tank 30.
  • the quantity of water fed into the tub 1 will therefore be independent of the conditions of horizontal arrangement of the dishwasher. It is no longer necessary to provide in the sump 5 a chamber 11 having a calibrated passage surface (Fig. 5).
  • the device therefore allows a double control of the volume of water fed into the tub: a volumetric control of a partialised flow, by means of the tank 30 and the siphon pipe 33, and a level control by means of the tank 12 which operates, as in the previous case, by triggering the pressure switch 14 when the level in the tub exceeds the required level L1.
  • the device according to this second embodiment also allows differentiated volumes of water to be fed. More specifically, when a reduced feed of water has to be performed, because for example the load of dishes to be washed is also reduced, the solenoid valve 35 opens the mouth of the siphon pipe 34, which has a lower trigger level L1' than the siphon pipe 33. Therefore the siphon pipe 34 will trigger before the siphon pipe 33, when a reduced volume of water has been fed into the tub 1.
  • Figure 6 shows a third embodiment of the present invention, functionally identical to that of Figure 3, but made as a single block 100 incorporating the tank 12, the pressure chamber 13, the tank 30 and the siphon pipes 33 and 34.
  • This single block 100 can be made in a plastic material by moulding, and is also housed in the cavity 50 of Figure 2.
  • a possible disadvantage which may lead to non-functioning of the control devices illustrated hitherto consists of the clogging of the partialising nozzle or nozzles 10 and 31.
  • the connection between the tank 12 and the washing tub also fails; the level in the tank 12 is therefore no longer related to the level of liquid in the tub 1.
  • a conduit 90 connects the sump 5 to a column 91 formed inside the tank 12. This column is equal in height to the safety level L2, and it leads at its upper end into the safety column 21.
  • the control device does not trigger and the level of liquid in the tub 1 rises beyond the safety level L2. Simultaneously the level of liquid in the column 91 also rises. Before the liquid overflows from the tub 1, the column 91 is completely filled and the liquid flows over from it into the safety column 21, thus actuating the block of the feed solenoid valve 3.

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  • Washing And Drying Of Tableware (AREA)

Claims (11)

  1. Dispositif destiné à commander l'alimentation en liquide de lavage dans un lave-vaisselle, comportant un premier réservoir (12) relie à une électrovanne d'alimentation (3) afin de délivrer du liquide à une cuve de lavage (1) du lave-vaisselle de façon à recevoir une première fraction plus petite dudit liquide, et des moyens de détection de niveau (13, 14, 17) reliés au dit premier réservoir afin de commander la fermeture de l'électrovanne d'alimentation (3) lorsque le niveau du liquide dans ledit premier réservoir (12) dépasse un premier niveau prédéterminé (L1), caractérisé en ce que ledit premier réservoir (12) est relié à la cuve de lavage (1) par des moyens de soupape (16) prévus pour permettre le passage d'un écoulement de liquide depuis le premier réservoir (12) jusqu'à la cuve de lavage (1) mais pas l'inverse et qui, pendant l'alimentation en liquide, sont maintenus ouverts par l'écoulement de liquide qui s'écoule depuis le premier réservoir (12) jusqu'à la cuve de lavage (1), jusqu'à ce que le niveau du liquide dans la cuve de lavage (1) coïncide avec le niveau de liquide dans le premier réservoir (12), ledit premier niveau prédéterminé (L1) étant le niveau de liquide exigé dans la cuve de lavage (1) à la fin de l'alimentation.
  2. Dispositif selon la revendication 1, ladite cuve de lavage comportant un bac (5) positionné dessous et étant reliée à ce dernier, caractérisé en ce que lesdits moyens de soupape (16) comportent une soupape anti-retour (16) qui s'écoule dans ledit bac (5), et qui, pendant l'alimentation en liquide, est maintenue ouverte par la pression de l'écoulement de liquide lui-même qui s'écoule depuis le premier réservoir (12) jusque dans le bac (5) mais qui, lorsque l'alimentation en liquide est terminée, est maintenue fermée par la pression du liquide dans la cuve de lavage (1).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que lesdits moyens de détection de niveau (13, 14, 17) comportent une chambre de pression (13) reliée au dit premier réservoir (12) et séparée de celui-ci par une chicane (17) d'une hauteur égale au dit premier niveau prédéterminé (L1), et un contacteur de pression (14) destiné à détecter la pression à l'intérieur de ladite chambre de pression (13) et à commander la fermeture de l'électrovanne d'alimentation (3) lorsque ladite pression dépasse une valeur prédéterminée.
  4. Dispositif selon la revendication 3, caractérisé en ce qu'il comporte un premier tuyau de siphon (25) qui relie le fond de la chambre de pression (13) au fond du premier réservoir (12) et qui permet de vider la chambre de pression (13) pendant une opération d'évacuation du liquide de la cuve de lavage (1).
  5. Dispositif selon la revendication 4, caractérisé en ce que ladite soupape anti-retour (16) conduit dans une chambre (11) du bac (5), ladite chambre (11) ayant une surface pour le passage du liquide vers la cuve de lavage (1) avec une section calibrée de sorte que, si la quantité de liquide délivrée dans la cuve (1) est inférieure à ce qui est exigé, l'actionnement d'une pompe de lavage génère dans ladite chambre (11) une dépression qui provoque l'ouverture de ladite soupape anti-retour (16) et l'aspiration, à travers ledit premier tuyau de siphon (25), du liquide contenu dans la chambre de pression (13), de sorte que le contacteur de pression (14) provoque une ouverture supplémentaire de l'électrovanne d'alimentation (3) afin de délivrer davantage de liquide.
  6. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comporte un deuxième réservoir (30) se raccordant également au niveau de l'alimentation en liquide de l'électrovanne d'alimentation (3) vers la cuve de lavage (1) de façon à recevoir une deuxième fraction plus petite dudit liquide, et un deuxième tube de siphon (33) qui s'amorce lorsque le deuxième réservoir (30) contient un premier volume de liquide exigé afin de transférer totalement ledit premier volume de liquide vers le premier réservoir (12), et à provoquer le déclenchement desdits moyens de détection de niveau (13, 14, 17).
  7. Dispositif selon la revendication 6, caractérisé en ce que ledit premier réservoir (12), ledit deuxième réservoir (30), ladite chambre de pression (13), ledit premier tuyau de siphon (25) et ledit deuxième tuyau de siphon (33) forment un bloc unique (100) logé dans une cavité (50) entre une paroi verticale de la cuve de lavage et une paroi verticale d'un châssis (2) du lave-vaisselle.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce qu'il comporte un troisième tuyau de siphon (34) qui peut être amorcé lorsque le deuxième réservoir (30) contient un deuxième volume exigé de liquide, plus petit que ledit premier volume, afin de transférer totalement ledit deuxième volume de liquide vers le premier réservoir (12), et de provoquer le déclenchement desdits moyens de détection de niveau (13, 14, 17), des moyens de soupape (35) étant également prévus et pouvant être actionnés afin de permettre l'amorçage dudit troisième tuyau de siphon (34).
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des moyens de verrou de sécurité (21 à 24) de l'électrovanne d'alimentation (3) qui se déclenchent lorsque, pendant l'alimentation en liquide, le liquide atteint un deuxième niveau prédéterminé (L2) dans la cuve de lavage (1).
  10. Dispositif selon la revendication 9, caractérisé en ce que lesdits moyens comportent une colonne de sécurité (21) formée dans ledit premier réservoir (12) et qui conduit dans ce dernier à travers une ouverture (22) placée à une hauteur égale au dit deuxième niveau prédéterminé (L2), ladite colonne de sécurité (21) étant reliée à un dispositif de commutation de pression (23) destiné à bloquer l'électrovanne d'alimentation (3).
  11. Dispositif selon la revendication 10, caractérisé en ce qu'il comporte également une autre colonne (91) formée dans ledit premier réservoir (12) et reliée par l'intermédiaire d'un conduit (90) au sommet d'un bac (5) positionné sous la cuve de lavage (1), ayant une hauteur égale au dit deuxième niveau prédéterminé (L2) et reliée à son sommet à ladite colonne de sécurité (21), ladite colonne supplémentaire (91) provoquant le déclenchement dudit dispositif de blocage de commutateur de pression lorsque, à la suite du blocage des moyens (10) destinés à fractionner l'écoulement de liquide de lavage qui alimentent ledit premier réservoir (12), le niveau de liquide dans la cuve de lavage (1) monte au-delà dudit deuxième niveau prédéterminé (L2).
EP95202782A 1994-10-20 1995-10-16 Dispositif de contrÔle de l'approvisionnement en liquide de lavage d'un lave-vaisselle Expired - Lifetime EP0710464B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI942144 1994-10-20
ITMI942144A IT1271021B (it) 1994-10-20 1994-10-20 Dispositivo di controllo del carico di liquido di lavaggio in una lavastoviglie

Publications (2)

Publication Number Publication Date
EP0710464A1 EP0710464A1 (fr) 1996-05-08
EP0710464B1 true EP0710464B1 (fr) 1999-06-02

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Application Number Title Priority Date Filing Date
EP95202782A Expired - Lifetime EP0710464B1 (fr) 1994-10-20 1995-10-16 Dispositif de contrÔle de l'approvisionnement en liquide de lavage d'un lave-vaisselle

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EP (1) EP0710464B1 (fr)
DE (1) DE69510006T2 (fr)
IT (1) IT1271021B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1275551B (it) * 1995-07-14 1997-08-07 Prealpina Tecnoplastica Un dispositivo per il controllo del livello d'acqua di carico di macchine lavastoviglie e simili
IT237085Y1 (it) * 1995-07-27 2000-08-31 Candy Spa Dispositivo di controllo per il carico di volumi differenziati diliquido di lavaggio in una lavastoviglie
IT1298176B1 (it) * 1998-01-22 1999-12-20 Smeg Spa Dispositivo per controllare e ripristinare il livello di acqua in una macchina lavastoviglie
DE102008022960A1 (de) * 2008-05-09 2009-11-12 Meiko Maschinenbau Gmbh & Co. Kg Schmutzabscheider-Einrichtung mit Niveauregelung
CN111603120A (zh) * 2019-02-22 2020-09-01 青岛海尔洗碗机有限公司 一种洗碗机
CN110575110A (zh) * 2019-10-16 2019-12-17 浙江玛莎蒂厨具有限公司 一种洗碗机的进水装置及进水控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716252C2 (de) * 1977-04-13 1983-04-07 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Geschirrspül- oder Waschmaschine mit einer Einrichtung zum Abgeben einer in einem Sammelbehälter abgemessenen Wassermenge
DE8218877U1 (de) * 1982-07-01 1982-10-07 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Einrichtung insbesondere an gechirrspuelmaschinen zurniveauregelung
DE3537789A1 (de) * 1985-10-24 1987-04-30 Licentia Gmbh Verfahren und vorrichtung zum befuellen eines behaelters
FR2630321B1 (fr) * 1988-04-22 1991-06-14 Esswein Sa Procede de remplissage en eau d'un lave-vaisselle et lave-vaisselle mettant en oeuvre ce procede
IT223519Z2 (it) * 1990-12-17 1995-07-20 Zanussi Elettrodomestici Lavastoviglie con pompa di scrico e valvola di non ritorno

Also Published As

Publication number Publication date
IT1271021B (it) 1997-05-26
DE69510006D1 (de) 1999-07-08
ITMI942144A1 (it) 1996-04-20
DE69510006T2 (de) 1999-10-21
ITMI942144A0 (it) 1994-10-20
EP0710464A1 (fr) 1996-05-08

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