EP1132038A2 - Geschirrspülmaschine mit unterschiedlichen Spülfähigkeiten - Google Patents

Geschirrspülmaschine mit unterschiedlichen Spülfähigkeiten Download PDF

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Publication number
EP1132038A2
EP1132038A2 EP01104760A EP01104760A EP1132038A2 EP 1132038 A2 EP1132038 A2 EP 1132038A2 EP 01104760 A EP01104760 A EP 01104760A EP 01104760 A EP01104760 A EP 01104760A EP 1132038 A2 EP1132038 A2 EP 1132038A2
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EP
European Patent Office
Prior art keywords
liquid
sprayer
dishwashing machine
flow
crockery
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
EP01104760A
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English (en)
French (fr)
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EP1132038A3 (de
EP1132038B1 (de
Inventor
Giuseppe Marchitto
Gaetano Olivieri
Fabio Roncati
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Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
Merloni Elettrodomestici SpA
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Application filed by Indesit Co SpA, Merloni Elettrodomestici SpA filed Critical Indesit Co SpA
Publication of EP1132038A2 publication Critical patent/EP1132038A2/de
Publication of EP1132038A3 publication Critical patent/EP1132038A3/de
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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
    • A47L15/4293—Arrangements for programme selection, e.g. control panels; Indication of the selected programme, programme progress or other parameters of the programme, e.g. by using display panels
    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0055—Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A47L15/4221—Arrangements for redirection of washing water, e.g. water diverters to selectively supply the spray arms
    • 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
    • A47L15/4287—Temperature measuring or regulating 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
    • A47L15/4289—Spray-pressure measuring or regulating 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
    • A47L2301/00—Manual input in controlling methods of washing or rinsing machines for crockery or tableware, i.e. information entered by a user
    • A47L2301/06—Crockery or tableware details, e.g. material, quantity, condition
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/02—Consumable products information, e.g. information on detergent, rinsing aid or salt; Dispensing device information, e.g. information on the type, e.g. detachable, or status of the device
    • A47L2401/023—Quantity or concentration of the consumable product
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/12—Water temperature
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/20—Time, e.g. elapsed operating time
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/03—Water recirculation, e.g. control of distributing valves for redirection of water flow
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/04—Water pressure or flow rate
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/06—Water heaters
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/07—Consumable products, e.g. detergent, rinse aids or salt
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the present invention refers to a household dishwashing machine.
  • household dishwashing machines generally comprise a box-type structure defining a washing chamber, wherein an upper loading basket and a lower loading basket are housed, for containing the crockery to be washed.
  • a spraying element is provided below each loading basket, rotating around a substantially vertical axis, which hits the crockery placed in the overhanging basket with a plurality of washing liquid jets; to this purpose, a special circulation pump actuated by an electric motor supplies pressurized liquid to the sprayers.
  • the hydraulic circuit of the dishwashing machine is designed for performing the execution of a washing cycle by supplying with water one sprayer only or by supplying with water both sprayers in an alternate way.
  • the first solution is typical for those cases where the dishwashing machine should be able to perform a so-called "half load" washing program, i.e. when only one basket is used, containing a restricted number of crockery items, and only the sprayer associated to the basket in use has to be supplied with the washing liquid.
  • An embodiment of this type is known for example from the document EP-A-0 772 995.
  • the second cited solution relating to the alternate supply of the sprayers, is presently spreading out for dishwashing machines and has essentially the aims of:
  • dishwashing machines having an alternate water supply to the sprayers are described in FR-A-2.505.643, EP-A-237.994, FR-A-2.443.231.
  • an intercepting device for the washing liquid flow, coming from the circulation pump and directed to one of the two supply branches of the sprayers; this intercepting device, appropriately controlled by the machine control system, keeps the above branch of the hydraulic circuit constantly closed, so that only the sprayer associated to the basket actually in use receives the liquid. for the whole duration of the washing program.
  • a flow deflector is provided, apt to convey the liquid alternatively to one of the above two branches; in this case, the machine control system instructs the flow deflecting device to open and close both branches of the hydraulic circuit, in alternate sequences; thus, the washing cycle is performed with alternate water supply to the upper and lower sprayer with the liquid at a preset temperature, wherein a certain amount of detergent is dissolved.
  • washing machines equipped with an r.p.m. adjusting system of the pump motor offer little flexibility as a whole.
  • the user on one hand, has the capability of selecting in a simple and accurate way the desired washing power, on the other hand, the user is compelled to wash crockery items having substantially homogeneous hardiness features; in other words, the user should only load in the dishwasher fragile crockery items requiring a relatively low pressure of the washing liquid or, alternatively, only standard or resistant crockery items, which can be washed at higher pressures.
  • Another problem of the prior art relates to the fact that to the treatment of different crockery items contained in the two baskets is anyway practically performed with a liquid having the same temperature and same amount of dissolved detergent, also in the instance of alternate washing; also the times of spraying both baskets do not change from each other, independently from their crockery contents.
  • known dishwashing machines do not allow for obtaining a real diversified treatment of the contents of both baskets during one same operating cycle.
  • the present invention has the aim of solving the above drawbacks of the prior art and providing a dishwashing machine comprising at least two sprayers, in which the capability is offered to the user of changing, in an easy and simple manner, one or more characteristics of the liquid flow exiting said sprayers, eventually also in an independent way from each other.
  • a first aim of the present invention is that of providing a dishwashing machine which allows for the selection of diversified washing powers for the two sprayers.
  • a second aim of the present invention is that of providing a dishwashing machine which allows for spraying, from a first sprayer, a liquid having a different temperature with respect to the liquid sprayed from a second sprayer.
  • a third aim of the present invention is that of providing a dishwashing machine which allows for spraying, from a first sprayer, a liquid having a different amount of dissolved detergent with respect to the liquid sprayed from a second sprayer.
  • a fourth aim of the present invention is that of providing a dishwashing machine in which, in the course of a same operating cycle, the duration of the treatment of the contents of a first basket can be different from the duration of the treatment of the contents of a second basket.
  • a further aim of the present invention is that of providing such a dishwashing machine which, though having a high versatility of use, is easy to use and to program by a user.
  • a further aim of the present invention is that of providing such a dishwashing machine which has a low manufacturing cost and uses simple, cost effective and reliable components.
  • Fig. 1 illustrates in a schematic way a dishwashing machine according to the present invention.
  • reference 1 indicates the washing chamber of the machine, being equipped with a lower collecting sump, indicated with 2; reference 3 indicates a washing pump or circulation pump, having a suitable electric motor, being commonly known.
  • Reference 3A indicates the suction branch of the above pump, which draws out washing liquid from the sump 2; the pump 3 forces then the washing liquid, through its delivery branch 3B, into an hydraulic circuit comprising a first branch 4 for supplying a lower sprayer 5 and a second branch 6 for supplying an upper sprayer 7; the baskets 8 and 9 rest in a known way over each sprayer.
  • Reference 10 indicates a flow deflector, of the known type, which is located between the inlets of the two branches 4 and 6, and is appropriately controlled by the machine control system, as it will become apparent later.
  • the flow deflector 10 is capable of assuming at least two different alternative operating conditions, in particular:
  • the flow deflector 10 can be controlled by the machine control system to ensure alternate supply to the sprayers 5 and 7.
  • Reference 11 indicates a heating element for the washing liquid and reference number 12 indicates a detergent dispensing device, both being of known manufacture and operation.
  • reference 20 indicates as a whole the control panel of the dishwasher shown of Fig. 1, located in the front upper part of the machine cabinet.
  • the panel 20 comprises a main on/off switch of the machine, indicated with 21, whereas 22 indicates a knob for selecting a washing cycle among a range of possible cycles, such as for example a soaking cycle (i.e. a simple rinsing of the crockery in order to postpone a real proper washing to a later time), a standard cycle, an intensive cycle, a short cycle.
  • a soaking cycle i.e. a simple rinsing of the crockery in order to postpone a real proper washing to a later time
  • a standard cycle i.e. a simple rinsing of the crockery in order to postpone a real proper washing to a later time
  • an intensive cycle i.e. a simple rinsing of the crockery in order to postpone a real proper washing to a later time
  • Reference 23 indicates a push-button for starting the program, which is used for starting the washing cycle previously selected with the knob 22.
  • References 24 and 25 indicate two slider selectors, of the known type, for the independent selection of the pressure of the jets delivered by the sprayer 5 and sprayer 7, respectively; in the given example, selectors 24 and 25 are provided to set the washing power of the crockery contained in the baskets 8 and 9, which is obtained adjusting the r.p.m. value of the motor of the pump 3.
  • selectors 24 and 25 are provided to supply the machine control system with primary information, i.e. indicating the type of crockery, based on which the control system self-adjusts the washing pressure or power for the sprayers.
  • primary information i.e. indicating the type of crockery
  • each selector can provide information relating to the following types of crockery: very delicate crockery, delicate crockery, standard crockery, resistant crockery.
  • reference 26 indicates a visualizing device or display, such as a liquid crystals display, apt to highlight information of different nature, such as the names of the operating programs that have been selected and/or can be selected by the knob 22 and some operating parameters of the machine, such as the water hardness degree detected in a known way, the residual duration time of a washing cycle, the suggested amount of detergent, and so on.
  • a visualizing device or display such as a liquid crystals display
  • Fig. 3 illustrates schematically a portion of the control system of the dishwashing machine according to the present invention.
  • such a control system is of the electronic type comprising a microcontroller, indicated schematically with MC.
  • This microcontroller MC has appropriate memory means, wherein the various operating programs of the dishwashing machine are codified, as well as the instructions required for performing the various functions that the latter is able to carry out.
  • the two selectors 24 and 25 are connected to appropriate inputs of the microcontroller MC through known ways and means.
  • a first and a second output of the microcontroller MC are provided for the control of the operation of the flow deflector 10 and the display 26, according to known procedures and means.
  • a third and a fourth output of the microcontroller MC are provided for the control of the heating element 11 and the detergent dispensing device 12 according to known procedures and means.
  • a fifth output of the microcontroller MC is connected, with known procedures and means, to a circuit indicated as a whole with CC, for controlling the speed of the motor of the pump 3.
  • This control circuit may be of any known type; for example it can be realized in accordance with the techniques described in the above documents IT-B-1.273.149 and IT-U-TO94U000053, the contents of which are herein incorporated by reference.
  • the circuit CC comprises a speedometer dynamo, indicated with DT, apt to detect the actual number of revolutions of the motor of the pump 3; said speedometer dynamo DT is connected with known procedures and means to an appropriate input of the microcontroller MC.
  • circuit CC The function of the circuit CC can be explained quite schematically as follows, with reference to a washing cycle with alternate water supply to the sprayers.
  • the speedometer dynamo DT is apt to generate a control signal which is proportional to the actual number of revolutions of the motor of the pump 3, which signal is sent to the microcontroller MC.
  • This signal is elaborated by the microcontroller itself, by a comparison, at different times, with a first and a second reference signal, relating to the number of revolutions the motor should perform for obtaining the desired washing power for the sprayers 5 and 7, respectively.
  • the above reference signals can be obtained using any known technique (see for instance the description of IT-B-1.273.149) and are obviously a function of the setting operated on selectors 24 and 25.
  • the microcontroller MC Following a comparison with the first reference signal, the microcontroller MC generates a driving signal of the circuit CC, which makes the motor of the pump 3 to reach and maintain the number of revolutions to the value being required to perform the desired treatment of the contents of the basket 8, set through the selector 24.
  • the microcontroller MC provides instead to compare the control signal of the speedometer dynamo DT with the second reference signal; then the microcontroller MC generates a new driving signal of the circuit CC, which will consequently provides for reaching and maintaining the number of revolutions of the motor of the pump 3 to the value being required for performing the desired treatment of the contents of the basket 9, set through the selector 25.
  • the dishwashing machine according to the present invention operates as follows.
  • the user After loading the glasses in the basket 9 and the pots in the basket 8, the user selects the desired washing program with the knob 22; to do this, the user is eventually aided by the instructions highlighted on the display 26 by the machine control system.
  • the microcontroller MC can be programmed to highlight appropriate indications and/or advice for the user on the display 26, according to the settings of the selectors 24 and/or 25.
  • the user will select, by the selector 25, a reduced washing power for the contents of the basket 9 and, by the selector 24, a higher washing power for the contents of the basket 8.
  • the user can start the washing cycle previously selected, by pressing the push-button 23.
  • the microcontroller MC controls the execution of the washing cycle, comprising its usual phases, such as a cold pre-washing phase, a hot washing phase, a hot rinsing phase, a cold rinsing phase, and so on; to this purpose, the microcontroller MC will use the program data coded in its own memory means.
  • each phase of the cycle step starts with a supply in the chamber 1 of the required quantity of water, as detected in a known way (for example by means of a pressure switch).
  • the microcontroller MC activates the circulation pump 3 and supplies its motor through the circuit CC.
  • the flow deflector 10 is in the position shown in Fig. 1, i.e. the closed position of the supply branch 4 of the lower sprayer 5.
  • the microcontroller MC After starting the pump 3, the microcontroller MC receives the relevant control signal from the speedometer dynamo DT, which changes with the increasing number of revolutions of the motor 3.
  • the microcontroller MC drives the circuit CC to maintain constant the reached number of revolutions.
  • washing liquid is forced by the pump into the branch 6 only, and the jets of the sprayer 7 are sprayed at a first pressure.
  • the pre-washing phase will go on in this way for a certain time, e.g. a few minutes, and be stopped by deactivation of the motor of the pump 3, performed by the microcontroller MC through the circuit CC.
  • the microcontroller MC controls the flow deflector 10 to pass over to the position illustrated by the dotted line of Fig. 1, i.e. to close the branch 6 supplying the upper sprayer 7. Subsequently, the motor of the pump 3 is started again by the microcontroller MC, through the circuit CC.
  • the microcontroller MC After the new start of the motor, the microcontroller MC receives the relevant control signal from the speedometer dynamo DT, which varies with the increasing number of revolutions of the motor.
  • the microcontroller MC drives the circuit CC in order to maintain constant the reached number of revolutions.
  • the treatment of the crockery contained in the basket 8 requires a higher washing power than the previous one, so that the number of revolutions of the motor of the pump 3 must be sufficiently high.
  • wash liquid is forced by the pump into the branch 4 only and the jets of the sprayer 5 are delivered at a second pressure, differing from the pressure previously used for treating the contents of the basket 9.
  • the washing cycle will go on in this way for a certain time, e.g. a few minutes, and be stopped by deactivation of the pump motor 3. Then the cycle can proceed further discharging the washing liquid from the chamber 1, followed by a new water supply from the mains, to perform a subsequent phase.
  • the microcontroller MC will activate the heater 11 after the supply of the required quantity of water in the chamber 3, until the desired temperature (detected in a known way) is reached; similarly, in the event of treatment phases requiring a washing agent dissolved in the water, the microcontroller MC will activate the dispensing device 12, to release the required amount of detergent.
  • the different positions of the flow deflector 10 can match different washing powers for the two sprayers.
  • the machine control system will appropriately "synchronize" the achievement of the two different washing powers, set by the selectors 24 and 25, with the variation of the working position of the flow deflector 10.
  • the above system can also be advantageously used for performing a "reduced" washing program, i.e. using one basket only containing the crockery to be washed, and supplying the sprayer relating to the basket in use.
  • the duly programmed microcontroller MC detects the instructions inserted by the user, by verifying the positions set on the selectors 24 and 25.
  • the microcontroller MC will be informed by the zero position of the selector 24 that the user intends to perform a washing using only the upper basket 9, and instruct the flow deflector 10 to go over to the closed position of the branch 4; this closed position will be maintained for the whole duration of the selected washing cycle.
  • the microcontroller MC will control the circuit CC as per the procedures previously described, and have the motor of the pump 3 reaching and maintaining only one speed for the whole washing cycle duration, i.e. the speed required to obtain the washing power set through the selector 25 from the sprayer 7.
  • this capability can be offered by using one selector only, for a determined sprayer, while the adjustment of the pressure relating to the other sprayer is provided by the program data of the machine control system.
  • the machine is fitted for example with the selector 25 only, for adjusting the washing power of the upper sprayer 7.
  • the user will select a washing cycle with the knob 22, for example the standard cycle, and set a determined washing power with the selector 25 for the sprayer 7, which is here supposed to be different from the washing power established by the program data related to the standard cycle.
  • the reference signal (to be compared with the value of the signal coming from the speedometer dynamo DT) relating to the speed the motor of the wash pump 3 should reach for performing the treatment of the contents of the basket 8, will be imposed by the microcontroller MC, according to the stored program data, relating to the standard cycle.
  • the reference signal for the speed the motor of the wash pump 3 should have to perform the treatment of the contents of the basket 9 will be determined on the basis of the position of the selector 25, as previously described.
  • the setting is allowed of the power or pressure of exit of the jets delivered by one of the sprayers, in an independent and selective manner compared to the power or pressure of exit of the jets of the other sprayer.
  • the selector or selectors employed may provide for a high number of selecting positions, which is by far higher than the previous one indicated in the example, for allowing a most accurate and variable setting according to the type of crockery to be washed in each basket.
  • the machine control system can also be programmed to perform the treatment of the contents of the two baskets with different temperatures of the washing liquid, always depending on the choices operated with the selecting means 24 and 25.
  • washing of the crockery is obtained by means of a chemical action (determined by the presence of detergent in the washing liquid), a thermal action (determined by the temperature of the washing liquid) and a mechanical action (determined by the power of the washing jets), for the treatment of the pots it will be preferable to use not only a significant pressure of the jets from the sprayer 5, but also a higher temperature of the washing liquid than required for washing the porcelain dishes contained in the upper basket 9.
  • the microcontroller MC is programmed for heating through the heater 11 at the beginning of the hot washing phase the liquid supplied to the tub, up to a first temperature, such as 45°C.
  • the microcontroller MC controls the positioning of the deflecting device 10, for closing the supply branch 6 of the upper sprayer 7; then it will start the pump 3, whose speed is set according to the above procedures.
  • the liquid sprayed by the upper sprayer 7 will have a first preset pressure and a first preset temperature.
  • the microcontroller MC will stop operation of the pump 3 and control the deflecting device 10 to close the branch 6 supplying the upper sprayer 7; the microcontroller MC will also activate the heating element 11 to bring the washing liquid to a second higher temperature than the previous one, such as 60°C.
  • the microcontroller MC Upon reaching said second temperature, the microcontroller MC starts the pump 3, whose speed will be determined as previously described, to obtain a higher washing power than the previous one.
  • the liquid sprayed by the lower sprayer 5 will have a second preset pressure and a second preset temperature.
  • the machine control system can also be advantageously programmed for optimizing the dispensing times and/or quantities of detergent in function of the type of crockery contained in each basket.
  • the detergent dispensing device 11 can be of the type able to contain a plurality of doses of detergent, which can be dispensed in sequence at different times under control of the machine programmer (a detergent dispenser structured as above is described for example in FR-A-2.593.697).
  • the microcontroller MC controls the position of the deflecting device 10 for determining the closure of the supplying branch of the lower sprayer 5, and then start the pump 3, whose speed will be determined according to the above procedures; eventually, also the temperature of the washing liquid can be determined as above.
  • the microcontroller will also instruct the detergent dispenser 12 to perform the dispensing of a first detergent dose.
  • the liquid sprayed by the upper sprayer 7 will contain a first amount of dissolved detergent and be sprayed with a first predetermined pressure; also the temperature of the washing liquid can have a first level, as said above.
  • the microcontroller MC will stop operation of the pump 3 and instruct the deflecting device 10 to close the supply branch 6 of the sprayer 7; then the microcontroller MC controls the detergent dispenser 11 to perform the dispensing of a second amount of detergent, to be added to the one already being contained in the washing liquid.
  • the microcontroller MC will start the pump 3, whose speed is determined as per the procedures previously described, obtaining a higher washing power than the previous one.
  • the liquid sprayed by the lower sprayer 5 will have a second predetermined pressure and a second amount of detergent dissolved in it, which is higher than the previous one; as said, by actuating the heater 11 again, also the temperature of the washing liquid can have a second level, as described above.
  • control system of the dishwashing machine can be easily programmed to submit the contents of the upper basket 9 to a time of treatment differing from the time of treatment for the contents of the lower basket 5.
  • the microcontroller MC will perform for example the cold pre-washing of the contents of the basket 9 for two minutes, maintaining during this period the deflecting device in the position illustrated in Fig. 1; vice-versa, the cold pre-washing for the contents of the basket 5 will last four minutes, by maintaining during this period the deflecting device in the position illustrated by the dotted line in Fig. 1.
  • the present invention offers a considerable flexibility of use for the dishwashing machine, since the user is free to change the type of washing of a specific sprayer, in particular by setting the pressure and/or the temperature and/or the detergent concentration of the liquid sprayed by one sprayer independently from the other sprayer.
  • the machine according to the present invention is easy to use and easy to be programmed by the user.
  • the components being required for manufacturing the dishwashing machine according to the present invention have a simple design, high reliability and a low cost, as well as the programming of the machine control system, in this frame it should also be noticed that an excellent method for the compact coding of the instructions being required for the operation of the dishwashing machine according to the present invention is the control technology based on fuzzy logic, by now widely utilized in the consumers' applications field, in particular for household electric appliances. Obviously, nothing hinders the use of other programming techniques, such as the tabular method.
  • the adjustment of the washing power of the sprayer 5 and 7 is obtained actuating the circulation pump 3 with appropriate speed.
  • the system for adjusting the speed of the motor of the pump 3 can be simplified with respect to the one described above.
  • the motor of the pump 3 may be for example of the a two-pole asynchronous single-phase type, with a main winding and an auxiliary winding; should a higher washing power be required, both said windings would be inserted to let the pump reach a determined maximum speed; vice-versa, should the washing require a lower washing power, one of the two windings would be deactivated, with a consequent reduction of the maximum possible speed for the motor, and consequently of the liquid pressure and flow rate in the branch 4 or 6 of interest.
  • the speed of interest of the pump 3 will be set by the selectors 24 and 25, which are indicative of the type of crockery contained in the baskets 8 and 9.
  • the liquid pressure and the flow-rate in the two branches 4 and 6 may also be adjusted using a known shutter, instead of a flow deflector, i.e. a device having a plugging element capable of assuming a plurality of intermediate working positions, instead of just a simple closing position of the branches 4 or 6.
  • the adjustment of the washing power is obtained by adequately shuttering the liquid flow circulated by the pump 3, i.e. providing an appropriate "choke” in the hydraulic circuit, to cause a change of the liquid flow-rate supplied to a machine sprayer.
  • the machine control system will be programmed for controlling an electric or thermo-electric actuator of the shuttering device, in function of the settings made with the selection means 24 and 25, so as to have a shutter differently positioned depending on the basket 5 or 7 to be prayed during the phase under consideration.
  • control system of the machine will also be programmed for selecting, for example according to the procedure already described above, a "reduced" washing cycle, i.e. using only one basket containing all the crockery to be washed, and supplying only the sprayer associated to the basket in use.
  • the microcontroller MC will obviously control the shuttering device in order that its shutter fully closes one of the two supply branches, so that the whole washing liquid is conveyed from the pump 3 to one sprayer only.
  • the machine control system in function of the choices operated by the user on the selecting means 24 and 25, the machine control system will determine both the motor speed of the pump 3 and the position of the shutter of the shuttering device, whereas in the second event, the control system will only control the shutter positioning.
  • the possibility is cited of equipping the machine with appropriate control means, for excluding the alternate washing function, in order to let the user to treat the crockery contained in both baskets 8 and 9 with the same washing pressure or power, determined in an autonomous way by the machine control system, based on the data stored in it.
  • control panel 20 may be fitted for example with a proper additional key, for the exclusion of the above function; as an alternative, the machine control system may be programmed to detect the exclusion of the above function from the zero positioning of both selectors 24 and 25.
  • the setting of the washing cycle can be performed with the knob 22, and on the basis of the program data of the microcontroller MC, which will also provide to position the deflector or shutter for having both the sprayers 5 and 7 supplied with the same flow-rate of liquid.
  • the selectors 24 and 25 are not hindered on a same position.
  • the machine according to the present invention is equipped with a shuttering device of the previously mentioned type, for performing diversified washings on both baskets while supplying both sprayers simultaneously, but with a different pressure or diversified flow rates.
  • a certain position of the shutter therefore determines simultaneously the liquid flow-rate to be supplied to the branch 4 and the liquid flow-rate to be supplied to the branch 6.
  • the present invention has been previously described with reference to a dishwashing machine equipped with an electronic programmer, i.e. using a microcontroller; however it is clear for the man skilled in the art that the invention may also apply to dishwashing machines fitted with an electromechanical programmer.
  • setting means 24 and 25 can be replaced with rotary knobs or keys, instead of cursor selectors, and the microcontroller MC can be programmed accordingly for highlighting the possible selections directly on the display 26.
  • a proper sort of menu could be provided, being highlighted by the display 26, comprising a set of options the user can select by means of scrolling and confirming keys.
  • the display 26 may highlight in its upper part and lower part a set of symbols being representative of the possible pressure adjustments for the upper sprayer and lower sprayer, respectively; in this event, the microcontroller MC is also programmed to highlight on the display 26 an appropriate pointer, sequentially movable on the above symbols in function of the pressure exerted on the respective input keys.
  • the washing program can be started by pressing the button 23. The same procedure may be followed to set the duration of the diversified washing cycles or for the temperatures selection.
  • a further possible variant embodiment provides only one selector or control means, instead of the two previously indicated with 24 and 25, for setting the washing power desired for each basket.
  • the sole selector provided can be combined with a confirmation key and the microcontroller MC can be programmed to highlight sequentially on the display 26 which type of crockery is contained in each basket. Therefore, following a request concerning the basket 8, the user will bring the selector to the desired position and press the confirmation button; then the request concerning the basket 9 will follow, and also in this case the user has to press the confirmation button after bringing the selector to the desired position.
  • the machine control system can also be programmed, in a known way for
  • the microcontroller MC will be programmed to control, through the heater 11, the heating of the washing liquid at the optimal temperature for the treatment of the delicate crockery (for example 50°C), which is in any case also used for washing the pots, through the alternation of the supply of the sprayers 7 and 8.
  • the machine control system always in function of the instructions supplied by the selectors 24 and 25, can provide to automatically change other variables of the cycle, such as the number of phases and/or the treatment times of the contents of the two baskets; this in view of the fact that the washing the pots contained in the lower basket 8 will necessarily require a more intensive treatment; accordingly, the machine control system can, for example, add a rinsing phase to the cycle for the crockery contained in the basket 8, which require a stronger treatment.
  • Another variant embodiment should different temperatures and/or detergent dosages be chosen for the two sprayers to be supplied, may consist in carrying out a complete washing phase of the contents of a first basket, the discharge of the washing liquid used and the subsequent supply of new clean water, to be heated and/or complemented with the amount of detergent suitable for washing the crockery contained in the second basket.
EP01104760A 2000-02-24 2001-02-26 Geschirrspülmaschine mit unterschiedlichen Spülfähigkeiten Revoked EP1132038B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO000181 2000-02-24
IT2000TO000181A IT1319915B1 (it) 2000-02-24 2000-02-24 Macchina lavastoviglie con possibilita' di lavaggio differenziato.

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EP1132038A2 true EP1132038A2 (de) 2001-09-12
EP1132038A3 EP1132038A3 (de) 2005-01-19
EP1132038B1 EP1132038B1 (de) 2009-12-30

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AT (1) ATE453355T1 (de)
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IT (1) IT1319915B1 (de)

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EP1332709A1 (de) * 2002-01-31 2003-08-06 LG Electronics, Inc. Geschirrspülmaschine mit einer Steuereinrichtung für die Umwälzpumpe und Verfahren zum Betreiben einer solchen Maschine
WO2006064514A1 (en) * 2004-12-13 2006-06-22 Ifb Industries Ltd An appliance with controlled soft wash operation
WO2007009527A1 (de) * 2005-07-16 2007-01-25 Electrolux Home Products Corporation N.V. Bedieneinrichtung für eine geschirrspülmaschine
WO2010012696A3 (de) * 2008-07-28 2010-06-03 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit sorptionstrocknungssystem
ITRN20080066A1 (it) * 2008-12-22 2010-06-23 Indesit Co Spa Metodo per evitare la rottura di stoviglie durante il lavaggio in una lavastoviglie.
EP2425758A1 (de) * 2010-09-03 2012-03-07 Electrolux Home Products Corporation N.V. Geschirrspüler und Verfahren zur Bedienung einer Geschirrspülmaschine
ITPR20120095A1 (it) * 2012-12-28 2014-06-29 Indesit Co Spa Metodo di lavaggio di stoviglie
EP2200495A4 (de) * 2007-08-31 2015-10-21 Lg Electronics Inc Verfahren zur steuerung einer geschirrspülmaschine mit einem dampferzeuger
EP2756789A3 (de) * 2012-12-28 2016-01-06 Indesit Company S.p.A. Verfahren zum Spülen von Geschirr
WO2016018780A1 (en) * 2014-07-31 2016-02-04 Illinois Tool Works Inc. Adjustable rinsing device and dishwashing machine having such a device
EP1458277B2 (de) † 2001-12-21 2016-11-02 BSH Hausgeräte GmbH Geschirrspülmaschine mit einer umsteuereinrichtung
US10524634B2 (en) 2017-09-29 2020-01-07 Midea Group Co., Ltd. Dishwasher with combined liquid and air sprayers
US10531781B2 (en) 2017-09-29 2020-01-14 Midea Group Co., Ltd. Dishwasher with discretely directable tubular spray elements
US10631708B2 (en) 2018-09-14 2020-04-28 Midea Group Co., Ltd. Dishwasher with docking arrangement for elevation-adjustable rack
US10765291B2 (en) 2018-09-14 2020-09-08 Midea Group Co., Ltd. Dishwasher with check valve in rotatable docking port
US11000176B2 (en) 2018-09-14 2021-05-11 Midea Group Co., Ltd. Dishwasher with rotatable diverter valve
US11026559B2 (en) 2019-09-30 2021-06-08 Midea Group Co., Ltd. Dishwasher with image-based fluid condition sensing
US11045066B2 (en) 2019-03-11 2021-06-29 Midea Group Co., Ltd. Dishwasher with keyed coupling to rack-mounted conduit
US11071440B2 (en) 2018-09-14 2021-07-27 Midea Group Co., Ltd. Dishwasher with rack-mounted conduit return mechanism
US11185209B2 (en) 2019-11-20 2021-11-30 Midea Group Co., Ltd. Dishwasher steam generator
US11191416B2 (en) 2019-09-30 2021-12-07 Midea Group Co., Ltd. Dishwasher with image-based position sensor
US11202550B2 (en) 2019-11-20 2021-12-21 Midea Group Co., Ltd. Dishwasher thermal imaging system
US11259681B2 (en) 2019-09-30 2022-03-01 Midea Group Co., Ltd Dishwasher with image-based diagnostics
US11399690B2 (en) 2019-09-30 2022-08-02 Midea Group Co., Ltd. Dishwasher with cam-based position sensor
US11412912B2 (en) 2020-09-21 2022-08-16 Midea Group Co., Ltd. Dishwasher with tubular spray element slip ring alignment
US11464389B2 (en) 2019-09-30 2022-10-11 Midea Group Co., Ltd. Dishwasher with image-based detergent sensing
US11484180B2 (en) 2020-11-11 2022-11-01 Midea Group Co., Ltd. Dishwasher with tubular spray element including multiple selectable spray patterns
US11484183B2 (en) 2019-09-30 2022-11-01 Midea Group Co., Ltd. Dishwasher with image-based object sensing
US11497374B2 (en) 2020-02-19 2022-11-15 Midea Group Co., Ltd. Dishwasher with wall-mounted rotatable conduit
US11826001B2 (en) 2022-02-15 2023-11-28 Midea Group Co., Ltd. Dishwasher with tubular spray element including elongated metal tube and retaining tab for mounting support member thereto

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FR2505643A1 (fr) 1981-05-14 1982-11-19 Candy Ind Spa Lave-vaisselle a organes de commutation pour l'alimentation alternee en eau des deux etages
EP0237994A2 (de) 1986-03-19 1987-09-23 INDUSTRIE ZANUSSI S.p.A. Geschirrspülmaschine mit einem Verteiler-Ventil im Flüssigkeitskreislauf
IT1273149B (it) 1994-04-15 1997-07-04 Merloni Elettrodomestici Spa Macchina lavastoviglie perfezionata con un sistema elettronico di regolazione della pressione dell'acqua di lavaggio
EP0962183A1 (de) 1998-05-28 1999-12-08 AEG Hausgeräte GmbH Geschirrspülmaschine mit wenigstens einem Geschirrkorb und Verfahren zum Betreiben derselben

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1458277B2 (de) † 2001-12-21 2016-11-02 BSH Hausgeräte GmbH Geschirrspülmaschine mit einer umsteuereinrichtung
EP1332709A1 (de) * 2002-01-31 2003-08-06 LG Electronics, Inc. Geschirrspülmaschine mit einer Steuereinrichtung für die Umwälzpumpe und Verfahren zum Betreiben einer solchen Maschine
WO2006064514A1 (en) * 2004-12-13 2006-06-22 Ifb Industries Ltd An appliance with controlled soft wash operation
WO2007009527A1 (de) * 2005-07-16 2007-01-25 Electrolux Home Products Corporation N.V. Bedieneinrichtung für eine geschirrspülmaschine
EP2200495A4 (de) * 2007-08-31 2015-10-21 Lg Electronics Inc Verfahren zur steuerung einer geschirrspülmaschine mit einem dampferzeuger
CN102131438A (zh) * 2008-07-28 2011-07-20 Bsh博世和西门子家用器具有限公司 包括吸附干燥系统的洗碗机
US9661981B2 (en) 2008-07-28 2017-05-30 BSH Hausgeräte GmbH Dishwasher comprising a sorption drying system
WO2010012696A3 (de) * 2008-07-28 2010-06-03 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit sorptionstrocknungssystem
EP2201884A1 (de) * 2008-12-22 2010-06-30 Indesit Company S.P.A. Verfahren zum Verhindern des Zerbrechens von Geschirrartikeln während des Waschens in einem Geschirrspüler
ITRN20080066A1 (it) * 2008-12-22 2010-06-23 Indesit Co Spa Metodo per evitare la rottura di stoviglie durante il lavaggio in una lavastoviglie.
EP2425758A1 (de) * 2010-09-03 2012-03-07 Electrolux Home Products Corporation N.V. Geschirrspüler und Verfahren zur Bedienung einer Geschirrspülmaschine
WO2012028710A1 (en) * 2010-09-03 2012-03-08 Electrolux Home Products Corporation N.V. Dishwasher and method for operating a dishwasher
ITPR20120095A1 (it) * 2012-12-28 2014-06-29 Indesit Co Spa Metodo di lavaggio di stoviglie
EP2756789A3 (de) * 2012-12-28 2016-01-06 Indesit Company S.p.A. Verfahren zum Spülen von Geschirr
WO2016018780A1 (en) * 2014-07-31 2016-02-04 Illinois Tool Works Inc. Adjustable rinsing device and dishwashing machine having such a device
US10524634B2 (en) 2017-09-29 2020-01-07 Midea Group Co., Ltd. Dishwasher with combined liquid and air sprayers
US10531781B2 (en) 2017-09-29 2020-01-14 Midea Group Co., Ltd. Dishwasher with discretely directable tubular spray elements
US11800963B2 (en) 2017-09-29 2023-10-31 Midea Group Co., Ltd. Dishwasher with discretely directable tubular spray elements
US11058279B2 (en) 2017-09-29 2021-07-13 Midea Group Co., Ltd. Dishwasher with discretely directable tubular spray elements
US10631708B2 (en) 2018-09-14 2020-04-28 Midea Group Co., Ltd. Dishwasher with docking arrangement for elevation-adjustable rack
US10765291B2 (en) 2018-09-14 2020-09-08 Midea Group Co., Ltd. Dishwasher with check valve in rotatable docking port
US11000176B2 (en) 2018-09-14 2021-05-11 Midea Group Co., Ltd. Dishwasher with rotatable diverter valve
US11071440B2 (en) 2018-09-14 2021-07-27 Midea Group Co., Ltd. Dishwasher with rack-mounted conduit return mechanism
US11045066B2 (en) 2019-03-11 2021-06-29 Midea Group Co., Ltd. Dishwasher with keyed coupling to rack-mounted conduit
US11026559B2 (en) 2019-09-30 2021-06-08 Midea Group Co., Ltd. Dishwasher with image-based fluid condition sensing
US11896182B2 (en) 2019-09-30 2024-02-13 Midea Group Co., Ltd. Dishwasher with image-based object sensing
US11889966B2 (en) 2019-09-30 2024-02-06 Midea Group Co., Ltd. Dishwasher with image-based object sensing
US11259681B2 (en) 2019-09-30 2022-03-01 Midea Group Co., Ltd Dishwasher with image-based diagnostics
US11399690B2 (en) 2019-09-30 2022-08-02 Midea Group Co., Ltd. Dishwasher with cam-based position sensor
US11191416B2 (en) 2019-09-30 2021-12-07 Midea Group Co., Ltd. Dishwasher with image-based position sensor
US11464389B2 (en) 2019-09-30 2022-10-11 Midea Group Co., Ltd. Dishwasher with image-based detergent sensing
US11877711B2 (en) 2019-09-30 2024-01-23 Midea Group Co., Ltd. Dishwasher with image-based detergent sensing
US11484183B2 (en) 2019-09-30 2022-11-01 Midea Group Co., Ltd. Dishwasher with image-based object sensing
US11766160B2 (en) 2019-09-30 2023-09-26 Midea Group Co., Ltd. Dishwasher with image-based position sensor
US11633081B2 (en) 2019-09-30 2023-04-25 Midea Group Co., Ltd. Dishwasher with image-based diagnostics
US11185209B2 (en) 2019-11-20 2021-11-30 Midea Group Co., Ltd. Dishwasher steam generator
US11202550B2 (en) 2019-11-20 2021-12-21 Midea Group Co., Ltd. Dishwasher thermal imaging system
US11864705B2 (en) 2019-11-20 2024-01-09 Midea Group Co., Ltd. Dishwasher thermal imaging system
US11497374B2 (en) 2020-02-19 2022-11-15 Midea Group Co., Ltd. Dishwasher with wall-mounted rotatable conduit
US11412912B2 (en) 2020-09-21 2022-08-16 Midea Group Co., Ltd. Dishwasher with tubular spray element slip ring alignment
US11484180B2 (en) 2020-11-11 2022-11-01 Midea Group Co., Ltd. Dishwasher with tubular spray element including multiple selectable spray patterns
US11826001B2 (en) 2022-02-15 2023-11-28 Midea Group Co., Ltd. Dishwasher with tubular spray element including elongated metal tube and retaining tab for mounting support member thereto

Also Published As

Publication number Publication date
EP1132038A3 (de) 2005-01-19
ITTO20000181A0 (it) 2000-02-24
ATE453355T1 (de) 2010-01-15
DE60140915D1 (de) 2010-02-11
EP1132038B1 (de) 2009-12-30
ITTO20000181A1 (it) 2001-08-24
IT1319915B1 (it) 2003-11-12

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