EP0861630A2 - Waschmaschine mit Zufuhr- und Dosiervorrichtung der Flüssigkeit und zugehöriges Dosierverfahren - Google Patents

Waschmaschine mit Zufuhr- und Dosiervorrichtung der Flüssigkeit und zugehöriges Dosierverfahren Download PDF

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Publication number
EP0861630A2
EP0861630A2 EP98830070A EP98830070A EP0861630A2 EP 0861630 A2 EP0861630 A2 EP 0861630A2 EP 98830070 A EP98830070 A EP 98830070A EP 98830070 A EP98830070 A EP 98830070A EP 0861630 A2 EP0861630 A2 EP 0861630A2
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EP
European Patent Office
Prior art keywords
discharge
metering
chambers
washing machine
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.)
Withdrawn
Application number
EP98830070A
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English (en)
French (fr)
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EP0861630A3 (de
Inventor
Marcello Premoli
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T&P SpA
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T&P SpA
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Filing date
Publication date
Application filed by T&P SpA filed Critical T&P SpA
Publication of EP0861630A2 publication Critical patent/EP0861630A2/de
Publication of EP0861630A3 publication Critical patent/EP0861630A3/de
Withdrawn legal-status Critical Current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
    • A47L15/4229—Water softening arrangements
    • 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 refers to a washing machine having a device for the supply and the dosage of liquid, and a relevant dosage method.
  • dishwashing machines comprise a washing tub, on whose bottom the water from the mains, being required to wash the crockery, is collected.
  • the machine is equipped with a recycling pump, for supplying one or more spraying elements with the above liquid collected on the tub bottom.
  • Such a solution may also prove suitable to perform the so-called reduced or differentiated washing cycles, which are executed when only one of the machine baskets is used to contain a reduced quantity of crockery. In such instances, it will be enough to feed a reduced volume of water to the machine, so as to minimize consumptions.
  • the volume of water fed during the steps of such 'reduced' washings is not necessarily equal to half the one usually supplied for a complete load.
  • the volume of water for a reduced washing may be in the order of 2/3 - 3/4 of the volume required for a standard washing (this in view of ensuring anyway a good washing performance, avoiding cavitation phenomena of the washing pump and keeping a sufficient dilution of soil residues).
  • the idea at the basis of the present invention is that of providing a more flexible water metering for a washing machine operation with respect to the known solutions, by using to this purpose a plurality of metering containers having different capacities, which according to the washing requirements can be repeatedly filled and discharged, independently from one another, within the frame of one same metering phase. As it can be understood, this implies particular supply and discharge sequences for the containers themselves.
  • sequences can be managed in a relatively simple way through a programmer or timer of the electronic type, i.e. based on the use of a microprocessor; said sequences, however, could be difficult to be realized in the instance of machines being equipped with common electromechanical timers.
  • Electromechanical timers are well known and do not need deep description here.
  • electromechanical timers are usually equipped with an electric motor which, once electrically supplied, rotates some cams through proper gear-reductions and/or ratchet gears.
  • Said cams usually consist of plastic disks, whose external profile is designed for opening/closing electric contacts, which in their turn will enable/disable the various internal devices of the machine and, consequently, their relevant functions.
  • the cams for actuating said devices have a step-by-step advancement, obtained through known kinematic arrangements, and for this reasons they are normally called 'slow' cams. Therefore, said cams advance by tripping or by steps and usually the number of steps provided is the one required to perform a full washing cycle during a complete cam rotation (for example, one timer step may last 60 seconds and a complete rotation of the slow cams pack may consist of 60 steps).
  • the timer may also have one or more fast cams, which are directly entrained by the timer motor through a gear-reduction.
  • Fast cams have a forward speed which is by far higher than the speed of the slow cams (usually a complete rotation of a fast cam occurs within 60 seconds, according to the requirements determined at design stage).
  • the step-by-step entraining device for the slow cams which includes the fast cams, causes the advancement of the slow cams pack at such a rate that each rotation of the fast cam will correspond to an advancement step of the slow cams (with reference to the above example, the slow cams will advance at intervals of 60 seconds from each other, i.e. the time required for a complete rotation of a fast cam).
  • electromechanical timers are characterized by substantially fixed operating times, dictated by the motor speed, by the cams angular speed and by the profile of the latter.
  • Such a characteristic may entail some practical problems in the event of dishwashing machines where water supply and metering occurs with the use of containers being repeatedly filled and discharged independently from each other.
  • a standard washing cycle comprises at least a prewashing phase, a washing phase, a hot rinse phase and a cold rinse phase; moreover, let us also consider that for each one of these phases, a water metering is necessary (and consequently the filling of the containers and their discharge into the tub).
  • Figure 1 shows schematically the hydraulic circuit of a washing machine, specifically a dishwasher, according to the present invention.
  • number 1 indicates a water dosage or metering device, consisting essentially of a plastic container, which is located in use in a cavity being present between a wall of the washing tub and a wall of the cabinet of the dishwasher.
  • the device 1 comprises internally a water inlet conduit AP from the water mains and a conduit AR for supplying the same water to a softening device, which will be described in the following; between the conduits AP and AR a so-called 'air-break' is located, indicated with SA, of the type and operation already known.
  • Chambers V1 and V2 are used to meter the water for the washing of the crockery, whereas chamber VR is used to meter the water required for resin regeneration of a softening device.
  • capacity of V1 may be equal to 700 cc
  • capacity of V2 equal to 1400 cc
  • the total capacity of VR equal to 250 cc.
  • chamber VR is split in three half-chambers, one of which fully open upwards, and the other two communicating outside the device 1 only through vent pipes TT; such pipes TT let the air in the relevant half-chambers flow upwards through the thrust of the water column rising in them during the water inlet step. Therefore, said tubes TT may be open or closed according to the position of a selector (not represented), and change the water volume available for resin regeneration as a function of the hardness degree of the water supplied from the mains. It is clear, in fact, that when pipes TT are closed, water can only enter the first half-chamber, i.e. the one opened upwards.
  • Chambers V1, VR and V2 have on their bottom relevant outlet connectors, indicated with 9, 10, 11; such connectors are fitted with respective control solenoid valves EV1, EVR e EV2.
  • a float G1 In the upper portion of the chamber V2 a float G1, of the type already known, for causing the commutation of a microswitch MC1, which controls a water supply solenoid valve (EVC).
  • EEC water supply solenoid valve
  • a hole FS is provided, communicating with the inside of the washing tub, for allowing the steams that form in the tub during the washing cycle to let off.
  • RE indicates a mains connector (e.g. a water tap), to which a pipe TA is connected for supplying the machine with water from the mains; on said pipe TA the solenoid valve EVC is located, which controls the mains water supply to the dishwasher; downstream of the solenoid valve EVC, the pipe TA is connected with the conduit AP of the container 1.
  • FV schematically indicates the washing tub of the dishwasher, while P indicates its discharge pump and TS a relevant drain pipe.
  • the softening device mentioned above is indicated with DD; such a device and its operation are already known as such, requiring no further detailed description. It should only be remarked that it comprises a container CR for the water softening resins and of a container SS for the regeneration salt of said resins; 12 indicates a conduit for connecting conduit AR of the container 1 to an inlet of the resin container CR; 13 indicates a conduit which connects an outlet of the resin container CR with the bottom of the chamber V1.
  • a conduit indicated with 15 connects the outlet connectors 9 and 11 with the tub FV; it should be noticed that solenoid valves EV1 and EV2 are located between connectors 9, 11 and the conduit 15, for controlling the discharge of chambers V1 and V2.
  • solenoid valve EVR is located between the connector 10 and the conduit 16.
  • the dishwasher is equipped with a programmer device or timer of the electromechanical type, comprising an electric motor which once enabled, rotates a cam pack.
  • Said cams have an external profile being configured to open/close some electric contacts, which in their turn enable/disable various internal devices and functions of the machine, as described at the beginning of the present description.
  • the timer controls the opening of the solenoid valve EVC; the mains water from the connector RE can reach the conduit AP through the pipe TA.
  • solenoid valves EV1, EV2, EVR and the discharge pump P are not supplied and the microswitch MC 1 is on its position of empty container.
  • Water in the conduit AP runs to the top portion of the container 1 and, after having overcome the air break SA, enters the conduit AR; it will be appreciated that a small volume of water unable to overcome the air break SA may fall on the bottom of chamber V1, where it is collected. From the conduit AR, water enters the conduit 12 and reaches the resin container CR; after flowing across the resins, the water now softened can reach chamber V1 from the bottom.
  • the three chambers V1, V2, VR result in being filled with a defined water volume (the volume of water collected in VR depending as said on the condition of pipes TT).
  • solenoid valves EV1 and EV2 can be supplied; in this way, the water volume contained in the chambers V1 and V2 can reach the washing tub FV, through the conduit 15 and the microswitch MC1 returns to its "empty" position.
  • the timer supply the solenoid valve EV2, which opens so allowing the water volume contained in the chamber V2 to flow into the tub FV.
  • Washing of the crockery can now start, in the usual manner; during all the water supply phases (prewashing, washing, rinsing) as provided by a complete washing cycle, the machine will perform as described above, in order to deliver to the washing tub volumetrically defined volumes of water.
  • the machine will operate in the same way as described above, however with the substantial difference that during the first one of the two water discharges from the device 1, the solenoid valve EV1 is not fed and remains closed; therefore, during this phase, only the water volume contained in the chamber V2 flows to the washing tub FV.
  • the supply stage provides the delivery of a reduced volume of water to the washing tub, which in the example is equal to 1400+1400 cc of water.
  • the timer controls the opening of the solenoid valves EVR and EV1.
  • the water contained in the chamber VR can flow through the conduit 16 to the salt container SS.
  • a corresponding passage of brine i.e. a water-salt solution
  • the resins of the softening device can be reactivated, during the resin regeneration stage.
  • Water contained in the chamber VR can flow to the salt container SS through the conduit 16 with a consequent brine flow from the container SS to the container CR.
  • the corresponding water volume exiting the container CR flows through the conduit 13 and enters the chamber V1; during this phase, the solenoid valve EV1 is open, and therefore such a water volume can flow to the tub FV, through the conduit 15.
  • Figures 2-5 represent schematically the electric control circuit of the machine according to the present invention, restricted to the portion being relevant for the supply and discharge of chambers V1 and V2, which relates to the present invention.
  • references MC1, EVC, EV2, EV1 indicate the elements already shown in Fig. 1.
  • T indicates the timer electric motor
  • R indicates a key to select the reduced washing cycle
  • I indicates the main switch of the machine.
  • Figs. 2-8 the hatched rectangles represent some of the electric contacts actuated by the cams of the timer; said contacts are indicated with the same references used for the devices they control, with the addition of the index '; moreover, CT indicates a control contact of the timer motor (T), whose function will become clear in the following.
  • the cited contacts are capable of taking two positions (open or closed), with the exception of contacts CV1 and CV2, which can take three positions, one of which (the central one, being not shown in the figures) is a rest position.
  • contacts CV1 and CV2 are controlled by a respective 'fast' cam of the timer, i.e. a cam capable of a complete rotation within the time the other cams, i.e. the slow cams, advance by one step, i.e. one timer step.
  • a respective 'fast' cam of the timer i.e. a cam capable of a complete rotation within the time the other cams, i.e. the slow cams, advance by one step, i.e. one timer step.
  • the contacts associated with the slow cams for the control of the solenoid valves managing the water supply and discharge from the container 1, i.e. contacts EVC', EV1' and EV2', are connected in series with the contacts associated with fast cams, i.e. contacts CV1 and CV2.
  • Such a solution allows to realize the supply and discharge, even repeated and independent, of the chambers V1 and V2 in one timer step alone, i.e. within the time required for the slow cams to advance by one step.
  • the microswitch MC1 is on its empty position.
  • the machine therefore carries out the supply of water being required for prewashing, which comprises the following phases.
  • the solenoid valve EVC is fed through MC1, which is on the empty position V, by means of CV2, which is in the position C, and by means of EVC', which is closed.
  • water can enter chambers V1, V2 and VR (in the example shown in Fig. 2, the contact CV1 is closed in A, for the control of a specific function of the machine - i.e. an initial discharge - which is excluded from the purposes of the present invention and will not be described here).
  • CV2 passes on D, and maintains this condition for about 20 seconds; in this way the solenoid valve EV2 is fed and chamber V2 can discharge into the tub.
  • CV1 passes on B, and maintains this condition for about 20 seconds; in this way the solenoid valve EVI is fed and chamber V1 discharged (following the discharge of chambers V1 and V2, MC1 goes back to the empty position V - as represented in the following Fig. 5 - and the motor of the timer T is still fed through EV2, which is closed).
  • CV1 passes to its central rest position, till a complete rotation of the relevant fast cam is accomplished; CV2 goes back to C and the motor T stops (this different behaviour of contacts CV1 and CV2 depends on the different profile of the two relevant fast cams).
  • CV2 goes to D, and maintains this condition for about 20 seconds; in this way, the solenoid valve EV2 is fed again and the contents of chamber V2 is discharged into the tub.
  • the machine performs the prewashing phase, which may last for example three timer steps, i.e. 180 seconds.
  • a water discharge from the washing tub will take place after the prewashing, which may last one timer step.
  • the program will perform the other phases as programmed (i.e. rinses), whose water supplies will take place according to the same procedures described above. Then, regeneration and washing phases of the resins will be obviously performed which, as said, are controlled by the timer according to known procedures and within appropriate times.
  • programmed i.e. rinses
  • regeneration and washing phases of the resins will be obviously performed which, as said, are controlled by the timer according to known procedures and within appropriate times.
  • the embodiment of the invention as previously described by way of example does not allow a single discharge of the chamber V1, as this operation cannot be detected by the float G1 and the relevant microswitch MC 1.
  • the device 1 could have a modified geometrical configuration, for defining a common volume with chambers V1 and V1 above them; an example of such an embodiment of the device 1 is represented schematically in Fig. 9, where the same references of Fig. 1 are used.
  • the float G1 is capable of detecting both a single discharge from the chamber V1 and a single discharge from the chamber V2, without any more constraints in the discharging sequence of the metering chambers.

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EP98830070A 1997-02-18 1998-02-16 Waschmaschine mit Zufuhr- und Dosiervorrichtung der Flüssigkeit und zugehöriges Dosierverfahren Withdrawn EP0861630A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO970133 1997-02-18
IT97TO000133A IT1291034B1 (it) 1997-02-18 1997-02-18 Macchina di lavaggio con dispositivo perfezionato per il caricamento ed il dosaggio di liquido, e relativo metodo di dosaggio.

Publications (2)

Publication Number Publication Date
EP0861630A2 true EP0861630A2 (de) 1998-09-02
EP0861630A3 EP0861630A3 (de) 1998-12-09

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EP98830070A Withdrawn EP0861630A3 (de) 1997-02-18 1998-02-16 Waschmaschine mit Zufuhr- und Dosiervorrichtung der Flüssigkeit und zugehöriges Dosierverfahren

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EP (1) EP0861630A3 (de)
IT (1) IT1291034B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934954A1 (de) * 1999-07-26 2001-02-01 Aweco Appliance Sys Gmbh & Co Haushaltsmaschine
KR101054130B1 (ko) 2004-05-20 2011-08-03 엘지전자 주식회사 식기 세척기의 에어 브레이크 구조
KR101065697B1 (ko) * 2004-12-30 2011-09-19 엘지전자 주식회사 식기세척기의 에어 브레이크 어셈블리 및 이를 이용한급수제어방법
EP2489296A3 (de) * 2011-02-16 2012-11-28 Miele & Cie. KG Verfahren zum Füllen eines Behandlungsraums eines wasserführenden Haushaltgeräts
EP2489299A3 (de) * 2011-02-16 2012-11-28 Miele & Cie. KG Wasserführendes Haushaltgerät mit einem Speicherbehälter
EP2679135A1 (de) * 2012-06-25 2014-01-01 Miele & Cie. KG Wasserführendes Haushaltgerät mit einem Speicherbehälter
WO2022019492A1 (ko) * 2020-07-22 2022-01-27 삼성전자주식회사 식기 세척기
DE102020126048A1 (de) 2020-10-06 2022-04-07 Miele & Cie. Kg Geschirrspülmaschine, insbesondere Haushaltsgeschirrspülmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798465A (en) * 1972-09-28 1974-03-19 Gen Electric Control arrangement for a washing machine
US3884088A (en) * 1973-01-23 1975-05-20 Mallory & Co Inc P R Timer having two separate cam means and means advancing the cam means at different speeds
GB2139084A (en) * 1983-05-06 1984-11-07 Bosch Siemens Hausgeraete Waste heat utilisation in the operation of a dishwashing machine
DE3930835A1 (de) * 1989-09-15 1991-03-28 Licentia Gmbh Haushaltsgeraet wie geschirrspuel- oder waschmaschine
EP0505684A2 (de) * 1991-01-31 1992-09-30 MERLONI ELETTRODOMESTICI S.p.A. Programmiervorrichtung für eine Waschmaschine
DE4238450A1 (de) * 1992-11-13 1994-05-19 Bosch Siemens Hausgeraete Programmgesteuerte Haushalt-Geschirrspülmaschine
EP0779056A2 (de) * 1995-12-11 1997-06-18 TECNOPLASTICA PREALPINA S.p.A. Zufuhr von Spülflüssigkeit und Dosiervorrichtung in einer Geschirrspülmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798465A (en) * 1972-09-28 1974-03-19 Gen Electric Control arrangement for a washing machine
US3884088A (en) * 1973-01-23 1975-05-20 Mallory & Co Inc P R Timer having two separate cam means and means advancing the cam means at different speeds
GB2139084A (en) * 1983-05-06 1984-11-07 Bosch Siemens Hausgeraete Waste heat utilisation in the operation of a dishwashing machine
DE3930835A1 (de) * 1989-09-15 1991-03-28 Licentia Gmbh Haushaltsgeraet wie geschirrspuel- oder waschmaschine
EP0505684A2 (de) * 1991-01-31 1992-09-30 MERLONI ELETTRODOMESTICI S.p.A. Programmiervorrichtung für eine Waschmaschine
DE4238450A1 (de) * 1992-11-13 1994-05-19 Bosch Siemens Hausgeraete Programmgesteuerte Haushalt-Geschirrspülmaschine
EP0779056A2 (de) * 1995-12-11 1997-06-18 TECNOPLASTICA PREALPINA S.p.A. Zufuhr von Spülflüssigkeit und Dosiervorrichtung in einer Geschirrspülmaschine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934954A1 (de) * 1999-07-26 2001-02-01 Aweco Appliance Sys Gmbh & Co Haushaltsmaschine
KR101054130B1 (ko) 2004-05-20 2011-08-03 엘지전자 주식회사 식기 세척기의 에어 브레이크 구조
KR101065697B1 (ko) * 2004-12-30 2011-09-19 엘지전자 주식회사 식기세척기의 에어 브레이크 어셈블리 및 이를 이용한급수제어방법
EP2489296A3 (de) * 2011-02-16 2012-11-28 Miele & Cie. KG Verfahren zum Füllen eines Behandlungsraums eines wasserführenden Haushaltgeräts
EP2489299A3 (de) * 2011-02-16 2012-11-28 Miele & Cie. KG Wasserführendes Haushaltgerät mit einem Speicherbehälter
EP2679135A1 (de) * 2012-06-25 2014-01-01 Miele & Cie. KG Wasserführendes Haushaltgerät mit einem Speicherbehälter
WO2022019492A1 (ko) * 2020-07-22 2022-01-27 삼성전자주식회사 식기 세척기
DE102020126048A1 (de) 2020-10-06 2022-04-07 Miele & Cie. Kg Geschirrspülmaschine, insbesondere Haushaltsgeschirrspülmaschine

Also Published As

Publication number Publication date
ITTO970133A1 (it) 1998-08-18
EP0861630A3 (de) 1998-12-09
IT1291034B1 (it) 1998-12-14

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