US20110017235A1 - Dishwasher and method for cleaning wash ware - Google Patents

Dishwasher and method for cleaning wash ware Download PDF

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Publication number
US20110017235A1
US20110017235A1 US12/935,301 US93530109A US2011017235A1 US 20110017235 A1 US20110017235 A1 US 20110017235A1 US 93530109 A US93530109 A US 93530109A US 2011017235 A1 US2011017235 A1 US 2011017235A1
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Prior art keywords
wash ware
rinsing
clear
phase
washing
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US12/935,301
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English (en)
Inventor
Dietrich Berner
Matthias Kaufmann
Harald Disch
Udo Burkle
Klaus Padtberg
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Premark FEG LLC
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Premark FEG LLC
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Assigned to PREMARK FEG L.L.C. reassignment PREMARK FEG L.L.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERNER, DIETRICH, BURKLE, UDO, DISCH, HARALD, KAUFMANN, MATTHIAS, PADTBERG, KLAUS
Assigned to PREMARK FEG L.L.C. reassignment PREMARK FEG L.L.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERNER, DIETRICH, BURKLE, UDO, DISCH, HARALD, KAUFMANN, MATTHIAS, PADTBERG, KLAUS
Publication of US20110017235A1 publication Critical patent/US20110017235A1/en
Abandoned 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
    • A47L15/50—Racks ; Baskets
    • 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
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • 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
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0026—Rinsing phases
    • 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
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0034—Drying phases, including dripping-off phases
    • 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
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0036—Steam or sterilizing phases
    • 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
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • 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
    • A47L15/4234—Steam generating 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
    • A47L15/4295—Arrangements for detecting or measuring the condition of the crockery or tableware, e.g. nature or quantity
    • 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
    • A47L2401/04—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
    • 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
    • A47L2501/06—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
    • A47L2501/14—Steam generators
    • 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
    • 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
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/04—Steam

Definitions

  • the invention relates to a dishwasher and to a method for cleaning wash ware in a dishwasher.
  • the invention relates particularly to a method for cleaning wash ware in a dishwasher, in particular a commercial dishwasher, which is designed as a programmable automatic machine.
  • the invention relates, furthermore, to a dishwasher, in particular a commercial dishwasher, in the form of a programmable automatic machine.
  • Manually loadable and unloadable dishwashers are programmable automatic machines.
  • Programmable automatic machines (called box-type ware washers or else batch dishwashers) may be basket push-through dishwashers, also called hood-type ware washers, or front-loadable ware washers.
  • Front loaders may be under-counter machines, top-counter machines or else free-standing front loaders.
  • Wash ware are, for example, plates, cups, pots, trays, cutlery, items of cutlery, glasses and kitchen utensils.
  • the publication EP 1 738 677 A2 discloses a domestic dishwasher which is designed for the following method sequence: a washing phase, during which washing fluid is sprayed by means of a pump out of a sump via spray nozzles into a washing chamber which is designed for receiving wash ware. Thereafter, washing fluid is pumped away, and the sump is filled with fresh water which is then conveyed by the same pump as that which previously conveyed the washing fluid to the same spray nozzles as the washing fluid.
  • a heater for heating the washing fluid, and, during the rinsing-clear phase, the rinse aid fluid may be heated or left unheated.
  • a steam phase follows, in which fresh water is evaporated out of the sump by means of the heating and is conducted via the said spray nozzles into the treatment chamber.
  • the steam phase may be followed by a drying phase in which the heated wash ware is dried.
  • a commercial dishwasher as a rule, has two water circuits which are completely separate from one another. These are a water circuit, which is responsible for washing and is executed with used water from the washing tank, and a fresh-water circuit, which is responsible for rinsing clear and uses fresh water from a boiler.
  • the main task of the rinsing-clear phase is to remove the washing fluid residues (lye) located on the wash ware.
  • the rinsing-clear fluid pure fresh water or fresh water mixed with rinse aid
  • the rinsing-clear fluid sprayed during the rinsing-clear phase flows into the washing tank and therefore also serves for regenerating the washing fluid.
  • the same quantity of washing fluid is pumped off from the washing tank.
  • the wash ware to be treated such as, for example, dishes, pots, glasses, cutlery and other utensils to be cleaned, are treated during a plurality of treatment phases to be carried out in succession, such as, for example, washing phase or phases, rinsing-clear phase or phases and drying phase or phases.
  • treatment phases such as, for example, washing phase or phases, rinsing-clear phase or phases and drying phase or phases.
  • different types of wash ware require different treatment parameters for the individual process steps because of their use, their degree of soiling, their shape and the material.
  • the programmable automatic dishwashers known from the prior art may be equipped with a plurality of programmes.
  • the individual programmes differ from one another mainly in the length of running time (cycle duration) of the treatment phases or, in the case of special programmes particularly for the treatment of drinking glasses, in the temperature parameters of the washing phase and of the rinsing-clear phase.
  • the operating personnel have the possibility, for example, of selecting a shorter programme for lightly soiled wash ware, such as, for example, drinking glasses, and a longer programme for more heavily or heavily soiled wash ware.
  • a programme preset at the factory is mainly employed for the treatment of the wash ware, irrespective of the type of wash ware.
  • wash ware in the treatment of the wash ware, a programme preset at the factory is employed, which, as a rule, is designed to be a compromise such that it can be used more or less efficiently for a plurality of types of wash ware, then, for example, lightly soiled crockery, such as, for example, drinking glasses, are washed for an uneconomically long time and at higher temperatures than would actually be required.
  • lightly soiled crockery such as, for example, drinking glasses
  • the invention is intended to achieve the object of providing a dishwasher, in particular commercial dishwasher, which is designed as a programmable automatic machine and which has a treatment chamber for receiving wash ware and which can provide good treatment results for all types of wash ware by the efficient utilization of resources (fresh water, chemicals and energy) during operation. Furthermore, the object is to be achieved of specifying a corresponding method for operating such a dishwasher designed as a programmable automatic machine.
  • the solution according to the invention is distinguished in that, before the actual treatment (cleaning) of the wash ware, first the type of wash ware to be treated is detected with the aid of a suitable wash-ware detector device and a predetermined (e.g., predefined) or determinable (e.g., user definable) treatment programme for the treatment of the wash ware is selected automatically as a function of the detected type of wash ware by a programme control device. Subsequently, an automatic setting of the process parameters associated with the selected treatment programme takes place.
  • a predetermined (e.g., predefined) or determinable (e.g., user definable) treatment programme for the treatment of the wash ware is selected automatically as a function of the detected type of wash ware by a programme control device.
  • the treatment programme may be set during machine manufacture or may be set or modified by service personnel and/or machine operators/users in the field or on-site.
  • an automatic detection of the type of wash ware to be treated is possible due to the provision of the wash-ware detector device.
  • an optimal treatment programme for the treatment of the wash ware during at least one treatment phase is selected automatically for each detected type of wash ware, and the process parameters associated with the selected treatment programme are set.
  • the selection and automatic setting of the process parameters preferably take place for at least one treatment phase (washing phase, rinsing-clear phase, drying phase). Since the process parameters applicable to the respective treatment phases can thereby be adapted to the type of wash ware to be treated, the consumption of fresh water, chemicals and energy can be optimized.
  • the programme control device is designed for assigning each detected type of wash ware to a predetermined or determinable wash ware group likewise preferably before the actual treatment of the wash ware.
  • a predetermined or determinable treatment programme according to which the wash ware of the type of wash ware assigned to this wash ware group is to be treated during at least one of the treatment phases, such as, for example, during the washing phase, the rinsing-clear phase and/or the drying phase.
  • the treatment programme predetermined or determinable for each wash ware group is preferably a treatment programme which is adapted, on the one hand, to the consumption of fresh water, chemicals and energy and, on the other hand, to a sufficient cleaning result.
  • the solution according to the invention therefore makes it possible that the process parameters of the dishwasher are optimally adapted automatically to the respective type of wash ware to be treated, without the operating personnel having to take action and carry out a programme selection manually.
  • the “type of wash ware” is understood in the present context to mean the type of wash ware to be treated or to be cleaned.
  • the type of wash ware depends particularly, for example, on the size, shape and/or material of the wash ware to be cleaned.
  • FIG. 1 shows diagrammatically a dishwasher designed in the form of a programmable automatic machine, according to a first embodiment of the invention
  • FIG. 2 shows diagrammatically a dishwasher designed in the form of a programmable automatic machine, according to a second embodiment of the invention.
  • the dishwasher 1 has a treatment chamber 2 for cleaning wash ware, not illustrated in the drawings.
  • a washing tank 4 in which fluid can flow back out of the cleaning chamber 2 by gravity.
  • the washing tank 4 may be covered at the transition to the treatment chamber 2 with the aid of a screen, not illustrated in the drawings.
  • the washing tank 4 contains washing fluid 6 which is usually water, to which, if appropriate, detergent can be supplied automatically in a controlled way by a detergent metering device, not illustrated in the drawings.
  • the washing fluid 6 can be conveyed by a washing pump 8 via a washing line system 10 to washing nozzles 33 and 34 (e.g., nozzles that may be located in upper and lower rotatable wash arms) and be sprayed through these washing nozzles 33 , 34 in the treatment chamber 2 onto the wash ware to be cleaned.
  • the sprayed washing fluid 6 subsequently flows back into the washing tank 4 .
  • the lower end 5 of the washing tank 4 may have connected to it a discharge line 3 with an outflow pump 11 , in order, as required, to empty the washing tank 4 .
  • a first rinsing-clear pump 12 is connected with its suction side to an outlet 35 of a boiler 21 .
  • the boiler 21 has, furthermore, an inlet 22 which is connected to a fresh-water feed line 28 and via which either fresh water or fresh water with metered rinse aid is supplied to the boiler 21 .
  • the fluid (pure fresh water or fresh water with metered rinse aid) supplied via the inlet 22 is heated according to a stipulated process sequence.
  • the rinsing-clear fluid heated in the boiler 21 may be supplied, for example during a fresh-water rinsing-clear phase, to rinsing-clear nozzles 7 and 9 (e.g., nozzles that may be located in upper and lower rotatable rinse arms) via a rinsing-clear line system 15 , 15 a .
  • the rinsing-clear nozzles 7 and 9 are arranged in the treatment chamber 2 , in order to spray the rinsing-clear fluid heated in the boiler 21 onto the wash ware in the treatment chamber 2 .
  • the boiler 21 is supplied via the inlet 22 and the fresh-water feed line 28 with pure fresh water, to which, after heating the boiler 21 , rinse aid is metered with the aid of a rinse-aid metering device, not illustrated in the drawings.
  • a second rinsing-clear pump 13 is provided, which is connected with its suction side to a fresh-water container 14 and with its delivery side to a rinsing-clear line system 15 , 15 b .
  • the rinsing-clear line system 15 b extending from the delivery side of the second rinsing-clear pump 13 and the rinsing-clear line system 15 a extending from the delivery side of the first rinsing-clear pump 12 merge into a common rinsing-clear line system 15 .
  • unheated rinsing-clear fluid can be conveyed to the rinsing-clear nozzles 7 and 9 arranged in the treatment chamber 2 , in order, as required, to spray unheated rinsing-clear fluid onto the wash ware.
  • the fresh-water container 14 has an inlet 37 which is connected to a fresh-water feed line 31 . Via this fresh-water feed line 31 , either pure fresh water or fresh water with metered rinse aid is supplied to the fresh-water container 14 . It is, of course, also conceivable, however, to arrange the already mentioned rinse-aid metering device, not illustrated explicitly in the drawings, downstream after the outlet 36 of the fresh-water container 14 .
  • the washing nozzles 33 , 34 and rinsing-clear nozzles 7 , 9 are in each case preferably arranged above and below the wash-ware region and are directed towards the wash-ware region of the treatment chamber 2 .
  • an upper washing-nozzle system and an upper rinsing-clear nozzle system, formed separately from this, and also a lower washing-nozzle system and a lower rinsing-clear nozzle system, formed separately from this, are provided. It would, of course, also be conceivable, however, to provide an upper and a lower washing-nozzle system which serves jointly for spraying washing fluid and for spraying rinsing-clear fluid.
  • washing nozzles 33 , 34 and/or the rinsing-clear nozzles 7 , 9 may be arranged only at the top or only at the bottom, instead of at the bottom and at the top, or, instead or additionally, also one side of the treatment chamber 2 and be directed into the wash-ware region transversely with respect to the treatment chamber 2 .
  • both the boiler 21 and the fresh-water container 14 are connected to a non-return device 16 via fresh-water feed lines 24 , 26 , 28 , 29 and 31 .
  • the non-return device 16 serves for preventing the situation where fresh water may be sucked back from the suction side of the first rinsing-clear pump 12 and/or the suction side of the second rinsing-clear pump 13 into a fresh-water feed line 17 .
  • the non-return device 16 has an outlet 40 which is connected to a water softener device 39 via fresh-water feed lines 24 and 41 .
  • the water softener device 39 has, on the one hand, a salt container 42 connected to the fresh-water feed line 41 and, on the other hand, first and second water softeners 39 a , 39 b arranged parallel to one another.
  • the two water softeners 39 a , 39 b arranged parallel to one another are connected to the outlet 40 of the non-return device 16 via corresponding fresh-water line system and the fresh-water feed line 24 .
  • the water softeners 39 a , 39 b of the water softener device 39 can be operated alternately by the suitable activation of valves 43 , in order to soften the fresh water supplied to the boiler 21 via the fresh-water feed lines 26 and 28 and the fresh water supplied to the fresh-water container 14 via the fresh-water feed lines 26 , 29 and 31 .
  • the salt container 42 belonging to the water softener device 39 may contain a suitable salt or a suitable chemical.
  • the salt or chemical serves, as required, for regenerating a water softener agent metered to the fresh water or a decomposition product occurring after metering.
  • the salt container 42 can be topped up with the salt or the chemical from the treatment chamber 2 of the dishwasher 1 via a port closable by means of a lid 44 .
  • the boiler 21 has an integrated steam generator 20 .
  • a corresponding steam outlet 23 of the steam generator 20 is formed at the upper region of the boiler 21 .
  • the steam outlet 23 of the steam generator 20 is connected via a steam line 32 , at a point 37 located above the washing tank 4 , to the treatment chamber 2 , in order, as required, to introduce into the latter the steam generated in the steam generator 20 .
  • the outlet port of the steam line 32 is preferably located between the upper nozzles 7 , 33 and the lower nozzles 9 , 34 of the washing line system 10 or of the rinsing-clear line system 15 .
  • other positions are, of course, also possible.
  • a heater 45 is located in the boiler 21 which serves not only for heating the rinsing-clear fluid, but also for generating steam. Furthermore, a level sensor 46 , which, for example, controls a valve 19 of the fresh-water line 17 , may be arranged in or on the boiler.
  • a programme control device 50 serves for controlling at least one cleaning programme and is designed and connected to the controllable components of the dishwasher 1 , such as, for example, to the valves 19 , 27 and 30 , to the washing pump 8 , to the first rinsing-clear pump 12 , to the second rinsing-clear pump 13 and/or to a heater control circuit (not illustrated explicitly) for controlling the heater 45 , in order to implement a cleaning method (cleaning cycle) having the following steps (phases) to be carried out in succession:
  • this is designed in such a way that it automatically activates the controllable components of the dishwasher 1 as a function of the detected type of wash ware, such that, after the fresh-water rinsing-clear phase, a steam rinsing-clear phase is carried out, in which steam is generated by means of the steam generator 20 connected at the fresh-water feed line 28 and is conducted into the treatment chamber 2 .
  • the dishwasher 1 is distinguished, inter alia, in that a wash-ware detector device 51 , indicated merely diagrammatically in the drawings, is provided, which serves for detecting the type of wash ware received in the treatment chamber 2 .
  • the wash-ware detector device 51 is preferably arranged inside or outside the treatment chamber 2 in such a way that either the wash ware received in the treatment chamber 2 or a wash-ware basket inserted in the treatment chamber 2 comes within its detection range.
  • wash-ware detector device used herein is to be understood as meaning any detection device which is designed for directly or indirectly detecting or determining the type of wash ware.
  • the wash-ware detector device 51 has at least one detector assembly 52 , by means of which the size, shape and/or material of the wash ware to be treated in the dishwasher 1 can be detected.
  • this has, for example, at least one preferably optically, inductively or capacitively operating detector assembly 52 , so that, to identify the type of wash ware, the size, shape and/or material of the wash ware can be detected.
  • other detector types may also be considered as a detector assembly 52 , such as, for example, inductively operating sensors, light scanners, light barriers, laser scanners, 3D lasers, cameras, etc.
  • the wash-ware detector device 51 has at least one detector assembly 52 , by means of which the type of wash ware can be detected indirectly.
  • This implementation is suitable particularly when the dishwasher 1 is designed in such a way that at least one wash-ware basket (not illustrated explicitly in the drawings), which receives the wash ware to be treated, can be inserted into the treatment chamber 2 of the dishwasher 1 .
  • the wash ware to be treated should preferably be sorted according to types of wash ware in such a way that only wash ware of a single type of wash ware is inserted in each wash-ware basket.
  • each wash-ware basket prefferably, in this case, to have an identification feature, such as, for example, an identification code, detectable by the detector assembly 52 .
  • the identification feature detected by the detector assembly 52 then delivers information on the type of wash ware received by the wash-ware basket.
  • the detector assembly 52 is designed to detect the size and/or type of the at least one wash-ware basket receivable in the treatment chamber 2 of the dishwasher 1 and, on the basis of this information, to draw a conclusion as to the type of wash ware received by the wash-ware basket.
  • wash-ware detector device 51 the wash-ware detector device 51 , the wash-ware detector device 51 , that this has a detector assembly 52 which is designed, for example, for detecting the type of wash-ware basket (plate basket, flat basket, cutlery basket, glass basket, etc.) inserted or to be inserted into the treatment chamber 2 and thus to determine indirectly the type of wash ware inserted into the treatment chamber 2 of the dishwasher 1 .
  • the type of wash-ware basket may be detected, for example, optically via the size, height and/or shape with the aid of the detector assembly 52 .
  • the detection of another suitable identification feature of the wash-ware basket may also be considered.
  • the programme control device 50 is designed to activate different activatable components of the dishwasher 1 , such as, for example, the respective pumps and valves, according to a predetermined or determinable programme sequence, so that suitable process parameters can thereby be set during the individual treatment phases (washing phase, rinsing-clear phase and drying phase).
  • the programme control device 50 is connected, in particular, via suitable communication connection to the wash-ware detector device 51 , in order continuously or at predetermined times or events, preferably before the start of the washing cycle, to interrogate the type, detected by the wash-ware detector device 51 , of wash ware received in the treatment chamber 2 of the dishwasher 1 .
  • the programme control device 50 is designed, on the basis of the type of wash ware detected by the wash-ware detector device, to recognize automatically the wash ware to be treated.
  • the programme control device 50 may preferably recognize automatically at least the following wash ware:
  • the respective wash ware is identified as “other wash ware”.
  • the solution according to the invention is distinguished not only, on the one hand, by the automatic detection of the type of wash ware to be treated and, on the other hand, by the automatic recognition of the wash ware to be treated, but also by the additional functionality of the programme control device 50 , whereby this is designed for automatically selecting as a function of the detected type of wash ware a predetermined or determinable treatment programme, according to which the wash ware received in the treatment chamber 2 is to be treated during at least one treatment phase, and for setting the process parameters of the selected treatment programme by means of a corresponding activation of the activatable components of the dishwasher 1 .
  • the programme control device 50 has, for example, a storage device, not illustrated explicitly in FIG. 1 , to which the programme control device 50 can have access. In each case optimally adapted treatment programmes or corresponding process parameters for operating the dishwasher 1 are stored in this storage device for the individual types of wash ware which are in question.
  • the invention is based on the knowledge that the process parameters optimal for the individual treatment phases are dependant on the type of wash ware to be treated.
  • the different types of wash ware require suitable treatment programmes, according to which the wash ware is to be treated, for example, during the washing phase, the fresh-water rinsing-clear phase and/or the drying phase.
  • wash ware also require coordinated treatment programmes for the fresh-water rinsing-clear phase which follows after the washing phase.
  • an “over-treatment”, particularly of only lightly soiled items of crockery, such as, for example, drinking glasses, can be efficiently prevented in a simple, but effective way, so that no more resources in terms of energy, water, chemicals, etc. than are necessary are used during the process of cleaning (and, if appropriate, of drying) only lightly soiled items of crockery of this type.
  • the consumption of fresh water, which is sprayed in pure form, or mixed with further additives, onto the wash ware, for example, during the fresh-water rinsing-clear phase can also be reduced.
  • the consumption of chemicals, in particular rinse aids and/or detergents can also be reduced, without a variation in the chemical concentration of the respective fluid (washing fluid, rinsing-clear fluid) occurring. Owing to a lower fresh-water supply, the water quantity to be heated is lower, with the result that energy can be saved.
  • the invention is based on the knowledge that, in conventional dishwashers, the washing and rinsing-clear cycles of which proceed according to a programme preset at the factory, an over-treatment of the wash ware often takes place. It is frequently sufficient for an adequate washing and rinsing result simply to have, for example, a shorter cycle duration of the washing phase, a smaller quantity of washing fluid which is sprayed per unit time during the washing phase, a lower nozzle pressure with which the washing fluid is sprayed during the washing phase, a smaller quantity of rinsing-clear fluid which is sprayed overall during the fresh-water rinsing-clear phase, and/or a lower temperature of the fluid (washing fluid, rinsing-clear fluid) to be sprayed during the washing phase and fresh-water rinsing-clear phase.
  • the programme control device 50 is designed in such a way that this automatically activates the washing pump 8 as a function of the detected type of wash ware, in such a way that at least one of the parameters given below is adapted to the detected type of wash ware for the washing phase:
  • the programme control device 50 is designed to set the washing pressure, that is to say the nozzle pressure with which the washing fluid is sprayed onto the wash ware during the washing phase, at a low value of, for example, 0.2 bar when the type of wash ware detected is plates manufactured from porcelain or porcelain-like material, drinking glasses manufactured from glass or a glass-like material or “other wash ware”.
  • the programme control device 50 preferably also sets the quantity of washing fluid sprayed per unit time during the washing phase to a low value of, for example, 120 l/min.
  • the nozzle pressure is preferably set automatically to a high value of, for example, 0.4 bar and the quantity of washing fluid sprayed per unit time during the washing phase is also set at a high value of, for example, 180 l/min.
  • the cycle duration of the washing phase should be reduced automatically, as compared with the treatment of the other types of wash ware, by the programme control device 50 .
  • the dishwasher 1 also has, in addition to the washing system, a fresh-water rinsing-clear system which has a first and a second rinsing-clear pump 12 , 13 and a rinsing-clear line system 15 a , 15 b , in order to convey rinsing-clear fluid out of the fresh-water container 14 or boiler 21 through rinsing-clear nozzles 7 , 9 into the treatment chamber 2 during the fresh-water rinsing-clear phase.
  • a fresh-water rinsing-clear system which has a first and a second rinsing-clear pump 12 , 13 and a rinsing-clear line system 15 a , 15 b , in order to convey rinsing-clear fluid out of the fresh-water container 14 or boiler 21 through rinsing-clear nozzles 7 , 9 into the treatment chamber 2 during the fresh-water rinsing-clear phase.
  • the programme control device 50 is designed to select a predetermined or determinable treatment programme for the fresh-water rinsing-clear phase automatically as a function of the detected type of wash ware and likewise automatically to set the process parameters associated with the selected treatment programme.
  • Settable process parameters which may be considered are, for example, in particular the cycle duration of the rinsing-clear phase, the quantity of rinsing-clear fluid to be sprayed overall during the rinsing-clear phase and/or the temperature of the rinsing-clear fluid to be sprayed during the rinsing-clear phase.
  • the programme control device 50 is designed to set the quantity of rinsing-clear fluid to be sprayed overall during the fresh-water rinsing-clear phase to a reduced value of, for example, 1.5 litres per unit area of size 500 mm ⁇ 500 mm, enclosed by the wall of the treatment chamber 2 , as seen in a top view of the treatment chamber, and the temperature of the rinsing-clear fluid to be sprayed during the fresh-water rinsing-clear phase to a high value of, for example, at least 80° C. when plates manufactured from porcelain or porcelain-like material, containers, in particular GN containers, pots, pans, cutlery and items of cutlery, manufactured from metal, in particular from high-grade steel, or “other wash ware” are to be treated.
  • the programme control device 50 automatically sets the quantity of rinsing-clear fluid to be sprayed during the fresh-water rinsing-clear phase to an increased value of, for example, higher than 2.5 litres per unit area of size 500 mm ⁇ 500 mm, enclosed by the wall of the treatment chamber 2 , as seen in a top view of the treatment chamber.
  • the temperature of the rinsing-clear fluid to be sprayed during the fresh-water rinsing-clear phase is in this case preferably set to a reduced value of, for example, at least 63° C.
  • the dishwasher 1 has the already mentioned steam rinsing-clear system 22 , 32 which, in particular, also comprises the steam generator 20 .
  • the steam generator 20 is connected to the fresh-water feed line 28 and is designed for generating steam.
  • the generated steam is conducted via the steam line 32 into the treatment chamber 2 during the steam rinsing-clear phase.
  • the programme control device 50 is designed to switch on the steam rinsing-clear system 22 , 32 automatically, as a function of the detected type of wash ware, after the expiry of the fresh-water rinsing-clear phase for a predetermined or determinable duration.
  • the programme control device 50 is designed to switch on the steam rinsing-clear system 22 , 32 automatically only when plates manufactured from porcelain or porcelain-like material, containers, in particular GN containers, pots, pans, cutlery and items of cutlery, manufactured from metal, in particular from high-grade steel, or “other wash ware” are detected as the type of wash ware.
  • condensation and drip phase can then be carried out, which will last for the defined time and in which the steam conducted into the treatment chamber 2 of the dishwasher 1 during the steam rinsing-clear phase can at least partially condense on the wash-ware surfaces, drip off and flow into the washing tank 4 by gravity.
  • This optionally provided condensation and drip phase lasts preferably for about 10 to 60 seconds, and even more preferably for about 20 to 30 seconds.
  • the above-described fresh-water rinsing-clear phase is carried out with a reduced fresh-water quantity of, for example, 1.5 litres, as a function of the detected type of wash ware, after the standard washing phase.
  • the steam rinsing-clear phase in which, with the aid of the steam introduced into the treatment chamber of the dishwasher, the washing fluid residues still remaining on the wash-ware surfaces after the fresh-water rinsing-clear phase are rinsed off completely.
  • a fresh-water quantity of about 0.05 to 0.25 litres, and preferably a fresh-water quantity of about 0.10 to 0.15 litres is used in steam form.
  • the fresh-water quantities given herein always relate to a dishwasher in the form of a programmable automatic machine, the treatment chamber 2 of which is designed for a wash-ware basket of standard size 500 mm ⁇ 500 mm, so that a unit area of the size 500 mm ⁇ 500 mm is enclosed by the wall of the treatment chamber 2 , as seen in a top view of the treatment chamber.
  • the dishwasher 1 there is provision for this to have, furthermore, a drying system, not illustrated explicitly in the drawings, with a drying blower.
  • the drying blower serves for causing a drying-air stream to circulate in the treatment chamber 2 of the dishwasher 1 during a drying phase to be carried out after the fresh-water or steam rinsing-clear phase.
  • the programme control device 50 to set automatically so that the cycle duration of the drying phase is set at an increased value of, for example, 180 seconds solely in the case of the detection of drinking glasses manufactured from glass or a glass-like material, in which the steam rinsing-clear phase is not carried out.
  • the volume flow of drying air circulating per unit time during the drying phase should have an increased value.
  • a reduced cycle duration of, for example, 120 seconds and a reduced volume flow of drying air circulating per unit time are sufficient.
  • the programme control device 50 used in the dishwasher 1 according to the invention is preferably designed to the effect of classifying each individual type of wash ware detected with the aid of the wash-ware detector device 51 in a predetermined wash ware group.
  • Each wash ware group is assigned a determined treatment programme, according to which the types of wash ware assigned to a specific wash ware group are treated during the individual treatment phases.
  • FIG. 2 illustrates diagrammatically a dishwasher 1 , in particular a commercial dishwasher, in the form of a programmable automatic machine, according to the second preferred embodiment of the solution according to the invention.
  • the dishwasher 1 illustrated in FIG. 2 has no fresh-water container and therefore also no second rinsing-clear pump, via which, as illustrated in FIG. 1 , unheated rinsing-clear fluid can be supplied to the rinsing-clear nozzles via a rinsing-clear line system.
  • the dishwasher 1 illustrated in FIG. 2 is otherwise structurally and functionally identical to the dishwasher described with reference to FIG. 1 . It is, of course, conceivable that the heater 45 of the boiler 21 or of the steam generator 20 can be appropriately activated via the heater control circuit (not illustrated explicitly) in order to provide rinsing-clear fluid heated to a greater or lesser extent.
  • the dishwasher 1 has, furthermore, a detergent metering device for metering detergent into the washing fluid.
  • the programme control device 50 should in this case particularly preferably be designed to set, as a function of the type of wash ware to be treated, the quantity of detergent metered into the washing fluid.
  • a standard value is selected for the quantity of metered detergent.
  • the dishwasher 1 has a rinse-aid metering device for metering rinse aid into the rinsing-clear fluid, the programme control device 50 preferably being designed to set, as a function of the type of wash ware to be treated, the quantity of rinse aid metered.
  • the programme control device 50 preferably being designed to set, as a function of the type of wash ware to be treated, the quantity of rinse aid metered.
  • the quantity of metered rinse aid is reduced automatically, in comparison with the other wash ware groups.
  • steam soaking is carried out automatically before the washing phase, in which steam is generated by means of the generator 20 and is conducted into the treatment chamber 2 .
  • This steam soaking phase is to be employed optionally, in particular, in the treatment of wash ware which is assigned to the second wash ware group.
  • the dishwasher 1 according to the invention has a detergent direct-spraying system, in order to spray detergent directly during the washing phase onto the wash ware inserted into the treatment chamber 2 .
  • This detergent direct-spraying system can preferably be activated by the programme control device 50 as a function of the detected type of wash ware. It is in this case appropriate for the programme control device 50 to be designed to switch on the detergent direct-spraying system during the washing phase when a type of wash ware assigned to the second wash ware group is detected.
  • the solution according to the invention allows an automatic detection of the type of wash ware to be treated and an automatic setting of programme parameters optimally adapted to the type of wash ware.
  • the programme control device 50 selectively to select automatically and correspondingly determine the process parameters which are optimal in terms of the type of wash ware, in order to afford the operating personnel basically the possibility of being able to set or vary manually the process parameters applicable to the individual treatment phases.

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  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)
US12/935,301 2008-04-07 2009-04-01 Dishwasher and method for cleaning wash ware Abandoned US20110017235A1 (en)

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DE102008017597.8 2008-04-07
DE102008017597A DE102008017597A1 (de) 2008-04-07 2008-04-07 Geschirrspülmaschine und Verfahren zum Reinigen von Spülgut
PCT/US2009/039059 WO2009126482A1 (en) 2008-04-07 2009-04-01 Dishwasher and method for cleaning wash ware

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EP (2) EP2273907B1 (de)
CN (2) CN105078392A (de)
CA (1) CA2715007A1 (de)
DE (1) DE102008017597A1 (de)
WO (1) WO2009126482A1 (de)

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CA2715007A1 (en) 2009-10-15
CN105078392A (zh) 2015-11-25
CN101998839A (zh) 2011-03-30
EP3406178B1 (de) 2020-10-21
DE102008017597A1 (de) 2009-10-08
EP2273907B1 (de) 2018-06-06
EP2273907A1 (de) 2011-01-19
WO2009126482A1 (en) 2009-10-15

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