EP0669099A2 - Vorrichtung zum Regeln des Niveaus der Waschflüssigkeit in einem Geschirrspüler - Google Patents

Vorrichtung zum Regeln des Niveaus der Waschflüssigkeit in einem Geschirrspüler Download PDF

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Publication number
EP0669099A2
EP0669099A2 EP95200393A EP95200393A EP0669099A2 EP 0669099 A2 EP0669099 A2 EP 0669099A2 EP 95200393 A EP95200393 A EP 95200393A EP 95200393 A EP95200393 A EP 95200393A EP 0669099 A2 EP0669099 A2 EP 0669099A2
Authority
EP
European Patent Office
Prior art keywords
tank
liquid
level
transfer recipient
recipient
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
EP95200393A
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English (en)
French (fr)
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EP0669099A3 (de
EP0669099B1 (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
Original Assignee
Candy SpA
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Filing date
Publication date
Application filed by Candy SpA filed Critical Candy SpA
Publication of EP0669099A2 publication Critical patent/EP0669099A2/de
Publication of EP0669099A3 publication Critical patent/EP0669099A3/de
Application granted granted Critical
Publication of EP0669099B1 publication Critical patent/EP0669099B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 device for controlling the level of the water is represented by a solenoid valve placed at the inlet of the pipe for feeding the flow of water, controlled by an electric pressure switch.
  • the switch detects, by means of a sensitive diaphragm, the air pressure in a compression chamber (pressure chamber) located at the top of a column of liquid connected to the washing drum of the dishwasher, a pressure which is proportional to the level of liquid in the drum.
  • the electric contacts of the switch are made to commutate by the sensitive diaphragm, so as to cause the closure of the solenoid valve when the pressure of the air in the chamber reaches a certain value corresponding to the maximum water level required in the washing drum.
  • Systems of this type can be defined as "direct control in drum".
  • a simple yet inaccurate system consists of controlling the time of opening of the feed solenoid valve by the programming device (timer). In this way however account is not taken of the possible variations in the flow rate and/or flow pressure of water fed to the solenoid valve.
  • This device although more accurate than the previous one, is subject to errors caused by differences in water flow rate or pressure in the branch pipe which feeds the measuring tank in relation to the pipe which feeds the drum.
  • European patent application no. 0351564 describes a control device which exploits the principle of filling the drum with water due to successive transfers from a smaller capacity recipient, for example equal to a third of the volume of water to be loaded into the drum.
  • a device for controlling the level of washing liquid in a dishwasher comprising a tank of capacity equal to a fraction of the quantity of liquid to be loaded into a washing drum of the dishwasher and fed via a feed solenoid valve, characterised in that it comprises first means for transferring liquid from said tank to a transfer recipient of smaller capacity compared to the tank, which first means are actuated when the tank has been filled and de-actuated when all the liquid contained in the tank has been transferred, a pressure chamber connected to said transfer recipient whereto pressure detector means are related which are actuated when the level of the liquid transferred in said recipient exceeds a first preset level to cause the closure of said feed solenoid valve, and second means for transferring liquid from said transfer recipient to the washing drum, which second means are actuated when the level of the liquid transferred into said transfer recipient exceeds a second preset level, greater than the first level.
  • the siphon pipe 14, also leading into the first transfer recipient 13, is instead connected to the top of the tank 11. Also connected at the top of the tank 11 a breather pipe 200, whose upper opening is located at a greater height in relation to the elbow of the siphon pipe 16.
  • the first transfer recipient 13 has a much smaller capacity than the tank 11 and is composed of two chambers 23 and 24 of different capacities and divided by a baffle 25 and connected only on the common base 26. Connected at the top of the chamber 24, with a smaller capacity and forming a pressure chamber, is a capillary tube 27, which leads at the other end to a pressure switch 28, which is connected to a programming device or timer (not shown) which regulates the working of the dishwasher.
  • the siphon pipe 16 is connected, which leads into the second transfer recipient 13.
  • the latter is shaped so as to form below a siphon 29 and leads, via a hose 30, to the collection basin 10.
  • the end of the hose 30, connected to the second transfer recipient 13, is located at a greater height than the end connected to the basin 10 to avoid backflows of water from the basin into the transfer recipient 13.
  • the hose 30 is bent to form a siphon too (Fig. 2).
  • a pipe 32 connects the top of the second transfer recipient 13 to the top of the chamber 23 of the first transfer recipient 12 to ensure that inside thereof there is the same pressure.
  • a pipe 33, formed between the bend of the siphon pipe 15, connects the top of the chamber 23 to the outside, via a hole 34. In this way the pressure in the chamber 23 and in the second transfer recipient 13 is always equal to atmospheric pressure.
  • the clean water from the water supply system is sent, in observance of legislation, to a so-called "air jump" assembly, having the function of preventing the water present in the circuit of the dishwasher from being sucked into the piping of the water supply system should vacuums be created in the latter.
  • This is substantially piping 41 comprising a vertical outward section 42, an upturned “U” outward section 43, an upturned “U” return section 44 and a vertical return section 45.
  • a hole 46 is formed, below which a container 47 is located, with volume of approximately 350 cc and wherein the small quantity of water which falls from the hole 46 is collected for subsequent use by the decalcification unit 21 in the phase of so-called recycling of decalcifying residues.
  • the decalcification unit 21 comprises a segment 48 containing decalcifying resins, and a segment 49 containing salts for regenerating the decalcifying resins.
  • the water from the section 45 of the piping 41 passes through the resins (connection schematically indicated by line 102) and from here is sent decalcified, as mentioned previously, via a pipe represented by line 22 to the tank 11.
  • the water which is collected in the container 47 is sent, by means of a pipe, represented in the figure by line 50, to the segment 49 containing the salts, to form a mixture of salty water used to regenerate the decalcifying resins.
  • Figure 1 also shows in section a pipe 51 connected to the interior of the washing drum 1 for releasing the steam partially condensated on the walls 52 of the container 47 before leaving the dishwasher via a breather hole 53.
  • the rate of flow of water entering the tank 11 is greater than the flow rate of the siphon 15, even after triggering of the latter, the quantity of water entering the tank 11 is greater than that transferred by the siphon 15 into the first transfer recipient 12.
  • the siphon 14 is also triggered, which causes an increase in the flow rate which serves to transfer water to the first transfer recipient 12. In this way the control device is ensured a high response speed.
  • the water is distributed in the two chambers 23 and 24.
  • the increase in the level of the water causes a gradual increase in the pressure of the air, and when this pressure exceeds a predefined level (corresponding to a level of water L3) the pressure switch 28 is actuated to send to the programming device the command for closure of the solenoid valve 3.
  • a predefined level corresponding to a level of water L3
  • the pressure switch 28 is actuated to send to the programming device the command for closure of the solenoid valve 3.
  • the siphon 16 remains triggered until the first pressure chamber 12 has been emptied: the two siphons 15 and 16 therefore remain triggered until the tank 11 has been completely emptied.
  • the existence of the breather pipes 32 and 33 and the hole 34 allows, as mentioned previously, the same air pressure to be maintained inside the second transfer recipient 13 and the chamber 23 of the first transfer recipient 12. In this way the siphons 15 and 16 can effectively remain in a triggered condition until the tank 11 and the first transfer recipient 12 have been emptied.
  • the siphon 29 having been triggered, the water is transferred into the collection basin 10 from the second transfer recipient 13, via the pipe 30.
  • the siphon 15 When the tank 11 has been totally emptied, the siphon 15 is detriggered. The level of water in the first transfer recipient 12 starts to fall, under the transfer action of the siphon 16. When this level falls below a recovery level L6, the pressure switch 28 signals this condition to the programming device, and the programming device reopens the solenoid valve 3. The tank 11 begins to fill once again, and thus a new cycle, identical to the previous one, begins.
  • the tank 11 is dimensioned so as to have a capacity equal to half of the quantity of water required for total loading of the dishwasher, at the end of the second cycle the level of water in the washing drum 1 of the dishwasher reaches the required level L5 (static level).
  • L5 static level
  • the pressure switch 28 indicates this condition to the programming device, which causes the advance to a subsequent phase of the washing cycle, maintaining the solenoid valve 3 closed.
  • the pump 6 is switched on, the level of water in the tank 1 falls in relation to L5, dropping below the perforated plate 31. This allows, among other things, elimination of additional nozzles for cleaning the plate 31.
  • This safety control is actuated through the chamber 35 of the second transfer recipient 13: when the level of water in the drum 1 exceeds a maximum safety level, which is translated into a level L7 in the pressure chamber 35, the pressure of air in the chamber 35 exceeds a predetermined value, and causes actuation of the lock pressure switch 38, which causes closure of the solenoid valve 3.
  • the presence of this safety control allows, among other things, the user to deliberately adjust the programming device, altering the predefined sequence to perform additional loads of water. This takes place in complete safety, since on exceeding the predefined safety level the flow of water is automatically interrupted.
  • regeneration provides for flowing of water from the collection recipient 47, with capacity of around 350 cm 2 , to the segment 49 of the decalcifier 21 to form a mixture of water and salts, and from the segment 49 to the segment 48 containing resins, which are thus regenerated.
  • it is sufficient to perform a partial load of 2.5 litres of water, corresponding to filling the tank 11.
  • the clean water entering the decalcifier in this way rinses the resins.
  • the control device described is particularly insensitive to the changes in flow rate and/or pressure of the water supply system.
  • Experimental tests have shown that, by using as a feed solenoid valve a standard solenoid valve calibrated to 6.5 I/min., a variation from 0.8 atm to 3.5 atm in the pressure of the incoming flow of water means a variation of 0.2 I in the quantity of water at complete load (that is to say a variation of between 4.9 I and 5.1 I), which represents an extremely satisfactory tolerance.
  • Figure 3 shows a particularly convenient embodiment of an assembly of control devices according to the invention and of an "air jump" assembly.
  • the control device remains substantially unchanged compared to the previous embodiment, but the "air jump" assembly is also inserted in the cavity 17 between the wall 18 of the washing drum 1 and the wall 19 of the framework 2 of the dishwasher.
  • this solution is suitable for production as a single part, using the aforementioned technique of blow moulding. In this way the overall dimensions and the assembly times are reduced, factors which both affect production costs.
  • a condensation conduit 54 is also formed into which the conduit 51, leading to the washing drum 1, outflows, as does the breather pipe 32 which leads to the second transfer recipient 13.
  • This condensation conduit is considerably effective, having a much more extensive condensation surface than that represented by the walls 52 of Figure 1.
  • the condensation conduit 54 is also shaped so as to provide tilted attachments 201 which define, with the walls of the conduit 54 itself, micro containers of water coming from the condensation of the steam leaving the basin of the conduit 51, or from the overflowing of the connection recipient 56, or again from the opening 58. In this way efficiency during the drying phase is increased.

Landscapes

  • Washing And Drying Of Tableware (AREA)
EP95200393A 1994-02-28 1995-02-18 Vorrichtung zum Regeln des Niveaus der Waschflüssigkeit in einem Geschirrspüler Expired - Lifetime EP0669099B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940353 1994-02-28
ITMI940353A IT1273347B (it) 1994-02-28 1994-02-28 Dispositivo per il controllo del livello del liquido di lavaggio in una lavastoviglie

Publications (3)

Publication Number Publication Date
EP0669099A2 true EP0669099A2 (de) 1995-08-30
EP0669099A3 EP0669099A3 (de) 1998-10-14
EP0669099B1 EP0669099B1 (de) 2001-07-04

Family

ID=11367998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200393A Expired - Lifetime EP0669099B1 (de) 1994-02-28 1995-02-18 Vorrichtung zum Regeln des Niveaus der Waschflüssigkeit in einem Geschirrspüler

Country Status (3)

Country Link
EP (1) EP0669099B1 (de)
DE (1) DE69521538T2 (de)
IT (1) IT1273347B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753281A1 (de) * 1995-07-14 1997-01-15 TECNOPLASTICA PREALPINA S.p.A. Steuervorrichtung des Wasserniveaus in einer Geschirrspülmaschine
EP0755651A2 (de) * 1995-07-27 1997-01-29 CANDY S.p.A. Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine
RU2494668C2 (ru) * 2008-05-09 2013-10-10 Майко Машиненбау Гмбх Унд Ко. Кг Устройство с контролем уровня для отделения загрязняющих примесей
US8702874B2 (en) 2011-02-08 2014-04-22 Electrolux Home Products, Inc. Method and system for removing a clog from a dishwasher
US8876980B2 (en) 2010-06-30 2014-11-04 Electrolux Home Products, Inc. System and associated method for preventing overfilling in a dishwasher
US11141039B2 (en) 2017-02-24 2021-10-12 Electrolux Appliances Aktiebolag Dishwasher, method and control system for handling clogging condition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT233540Y1 (it) 1994-07-04 2000-01-28 Candy Spa Dispositivo per il recupero e la conservazione del liquido di lavaggio in macchine lavastoviglie,lavabiancheria e simili

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716252A1 (de) * 1977-04-13 1978-10-19 Bosch Siemens Hausgeraete Geschirrspuel- oder waschmaschine mit einer einrichtung zum abgeben einer in einem sammelbehaelter abgemessenen wassermenge
FR2589262A1 (fr) * 1985-10-24 1987-04-30 Licentia Gmbh Procede et dispositif de remplissage d'une cuve
EP0571806A1 (de) * 1992-05-26 1993-12-01 BITRON S.p.A. Einrichtung zur Messung der einem Haushaltsgerät zugeführten Wassermenge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716252A1 (de) * 1977-04-13 1978-10-19 Bosch Siemens Hausgeraete Geschirrspuel- oder waschmaschine mit einer einrichtung zum abgeben einer in einem sammelbehaelter abgemessenen wassermenge
FR2589262A1 (fr) * 1985-10-24 1987-04-30 Licentia Gmbh Procede et dispositif de remplissage d'une cuve
EP0571806A1 (de) * 1992-05-26 1993-12-01 BITRON S.p.A. Einrichtung zur Messung der einem Haushaltsgerät zugeführten Wassermenge

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753281A1 (de) * 1995-07-14 1997-01-15 TECNOPLASTICA PREALPINA S.p.A. Steuervorrichtung des Wasserniveaus in einer Geschirrspülmaschine
EP0755651A2 (de) * 1995-07-27 1997-01-29 CANDY S.p.A. Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine
EP0755651A3 (de) * 1995-07-27 1999-03-24 CANDY S.p.A. Kontrollvorrichtung zum Eingeben von unterschiedlichen Mengen von Spülflüssigkeit in einer Geschirrspülmaschine
RU2494668C2 (ru) * 2008-05-09 2013-10-10 Майко Машиненбау Гмбх Унд Ко. Кг Устройство с контролем уровня для отделения загрязняющих примесей
US8876980B2 (en) 2010-06-30 2014-11-04 Electrolux Home Products, Inc. System and associated method for preventing overfilling in a dishwasher
US9565987B2 (en) 2010-06-30 2017-02-14 Electrolux Home Products, Inc. System and associated method for preventing overfilling in a dishwasher
US10178936B2 (en) 2010-06-30 2019-01-15 Electrolux Home Products, Inc. System and associated method for preventing overfilling in a dishwasher
US8702874B2 (en) 2011-02-08 2014-04-22 Electrolux Home Products, Inc. Method and system for removing a clog from a dishwasher
US11141039B2 (en) 2017-02-24 2021-10-12 Electrolux Appliances Aktiebolag Dishwasher, method and control system for handling clogging condition

Also Published As

Publication number Publication date
DE69521538T2 (de) 2001-11-22
ITMI940353A1 (it) 1995-09-01
EP0669099A3 (de) 1998-10-14
ITMI940353A0 (it) 1994-02-28
DE69521538D1 (de) 2001-08-09
IT1273347B (it) 1997-07-08
EP0669099B1 (de) 2001-07-04

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