WO2013028392A1 - Lave-vaisselle et procédé permettant de nettoyer automatiquement un lave-vaisselle - Google Patents

Lave-vaisselle et procédé permettant de nettoyer automatiquement un lave-vaisselle Download PDF

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Publication number
WO2013028392A1
WO2013028392A1 PCT/US2012/050697 US2012050697W WO2013028392A1 WO 2013028392 A1 WO2013028392 A1 WO 2013028392A1 US 2012050697 W US2012050697 W US 2012050697W WO 2013028392 A1 WO2013028392 A1 WO 2013028392A1
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WO
WIPO (PCT)
Prior art keywords
wash
dishwasher
control device
cleaning
zone
Prior art date
Application number
PCT/US2012/050697
Other languages
English (en)
Inventor
Markus Heidt
Harald Disch
Norbert Litterst
Harry Braun
Original Assignee
Premark Feg L.L.C.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Premark Feg L.L.C. filed Critical Premark Feg L.L.C.
Priority to CN201280039918.6A priority Critical patent/CN103841873B/zh
Priority to AU2012299228A priority patent/AU2012299228B2/en
Priority to EP12748141.4A priority patent/EP2744385B1/fr
Publication of WO2013028392A1 publication Critical patent/WO2013028392A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0057—Cleaning of machines parts, e.g. removal of deposits like lime scale or proteins from piping or tub
    • 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
    • A47L15/0076—Washing or rinsing machines for crockery or tableware of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals
    • 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
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/16—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with rigidly-mounted spraying devices
    • 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
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
    • 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
    • A47L2401/07—Status of hydraulic components, e.g. open/close status of water inlet/outlet valves, operating position of water diverters
    • 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
    • A47L2401/14—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
    • 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
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • 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
    • A47L2501/05—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
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • 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
    • A47L2501/34—Change machine operation from normal operational mode into special mode, e.g. service mode, resin regeneration mode, sterilizing mode, steam mode, odour eliminating mode or special cleaning mode to clean the hydraulic circuit

Definitions

  • the invention relates to a dishwasher, in particular commercial dishwasher or utensil washer, which is in the form of a box-type dishwasher or a conveyor-type dishwasher, and also to a method for automatically cleaning a dishwasher of this kind.
  • the invention is particularly directed at a dishwasher which has a wash system, wherein the wash system has the following: a wash tank for accommodating wash liquid, a plurality of spray nozzles, which are formed in at least one wash tube, for spraying wash liquid onto the washware which is to be cleaned, and a wash pump, which is connected to the at least one wash tube by means of a line system, for supplying wash liquid from the wash tank to the spray nozzles which are formed in the at least one wash tube, wherein the spray nozzles are arranged and formed relative to the wash tank in such a way that at least some of the wash liquid which is sprayed by the spray nozzles flows back into the wash tank
  • Box-type dishwashers are dishwashers which can be manually loaded and unloaded.
  • Box-type dishwashers also called “box- type warewashers” or “batch dishwashers”
  • Box-type dishwashers may be hood-type dishwashers ("hood-type warewashers”) or front-loader dishwashers ("front-loader warewashers”).
  • Front-loader dishwashers may be under-counter machines, top-counter machines or free-standing front-loader dishwashers.
  • a dishwasher which is in the form of a box-type dishwasher usually has a treatment chamber for cleaning washware.
  • the treatment chamber generally has arranged beneath it a wash tank in which liquid from the treatment chamber can flow back due to the force of gravity.
  • the wash tank contains wash liquid which is usually water to which detergent may be added if required.
  • a dishwasher which is in the form of a box-type dishwasher also has a wash system with a wash pump, a line system which is connected to the wash pump, and with a plurality of spray nozzles which are formed in at least one wash arm.
  • the wash liquid contained in the wash tank can be conveyed from the wash pump to the spray nozzles via the line system and be sprayed onto the washware to be cleaned through the spray nozzles in the treatment chamber. The sprayed wash liquid then flows back into the wash tank.
  • Conveyor-type dishwashers are, in particular, flight-type dishwashers ("flight-type warewashers”) or rack-conveyor dishwashers ("rack- conveyor warewashers”). Conveyor-type dishwashers are usually used in the commercial field. In contrast to box-type dishwashers, in which the washware to be cleaned remains stationary in the machine during the cleaning process, the washware is transported through various treatment zones of the conveyor- type dishwasher in the case of conveyor-type dishwashers.
  • a conveyor-type dishwasher usually has at least one prewash zone and at least one main-wash zone which is arranged downstream of the prewash zone or zones as seen in the transportation direction of the washware.
  • at least one post-wash zone and at least one final-rinse zone which is downstream of the post- wash zone, are generally arranged downstream of the main-wash zone or zones.
  • the washware which is either accommodated directly on the conveyor belt or is retained by racks, usually runs, in the transportation direction, through an inlet tunnel, the following prewash zone or zones, main-wash zone or zones, post-wash zone or zones, final-rinse zone or zones and a drying zone, into an outlet section.
  • the abovementioned wash zones of the conveyor-type dishwasher each have an associated wash system which has a wash pump and a line system which is connected to the wash pump, via which liquid is supplied to the spray nozzles of the wash zone.
  • the wash liquid which is supplied to the spray nozzles is sprayed onto the washware, which is transported through the respective wash zones by a transportation apparatus of the conveyor-type dishwasher, in the respective wash zone.
  • Each wash zone has an associated tank in which sprayed liquid is accommodated and/or in which liquid for the spray nozzles of the relevant zones is provided.
  • final-rinse liquid in the form of fresh water which may be pure or mixed with further additives, for example rinse aid, is sprayed onto the washware via the spray nozzles of the final-rinse zone. At least some of the final-rinse liquid sprayed is transported from zone to zone, counter to the transportation direction of the washware, via a cascade system.
  • the sprayed final-rinse liquid is collected in a tank (post- wash tank) of the post-wash zone, from which it is conveyed to the spray nozzles (post-wash nozzles) of the post-wash zone via the wash pump of the wash system which is part of the post-wash zone.
  • wash liquid is rinsed off from the washware.
  • the liquid which accumulates in the process flows into the wash tank of the at least one main-wash zone which is arranged upstream of the post-wash zone as seen in the transportation direction of the washware.
  • the liquid is usually provided with a detergent and is sprayed onto the washware by a pump system (wash pump) , which is part of the wash system of the main-wash zone, via the nozzles (wash nozzles) of the main-wash zone. If no further main-wash zones are provided, the liquid then flows from the wash tank of the main-wash zone into the prewash tank of the prewash zone.
  • the liquid in the prewash tank is sprayed onto the washware via a pump system, which is part of the wash system of the prewash zone, via the prewash nozzle of the prewash zone in order to remove coarse dirt from the washware .
  • the dishwashers under consideration here and, in particular, commercial dishwashers therefore usually comprise at least one wash system which has a wash pump which ensures a virtually constant water circulation rate for the duration of a wash process in the treatment chamber (in the case of box- type dishwashers) or in the respective treatment zone (in the case of conveyor-type dishwashers) .
  • the respective wash pumps of the wash systems are switched on and switched off by a control device (machine controller) which is part of the dishwasher .
  • Each wash system generally also has an associated screen system in order to separate out solid particles of dirt from the wash liquid which is sprayed onto the washware to be cleaned via the spray nozzles.
  • Screen systems of this kind are preferably designed in such a way that they can be manually removed from the dishwasher, for example in order to be cleaned.
  • the dishwasher is and has to be cleaned at the end of each working day. This involves a large number of working steps which have to be performed manually.
  • the wash arms and the screen systems of the individual wash systems first have to be removed. Since a conveyor-type dishwasher generally has a plurality of wash zones which are arranged one behind the other, and therefore a corresponding plurality of wash systems, these working steps have to be carried out several times .
  • the uninstalled screen systems are then manually spray-washed with hot water and additionally manually scrubbed depending on the degree of soiling.
  • the loading zone of a conveyor-type dishwasher which is the treatment zone which is soiled to the greatest extent, is spray-washed with hot water and sometimes (if necessary) manually cleaned with a cleaning cloth and possibly with the aid of a detergent solution during the cleaning process.
  • each zone is purged with hot water and sometimes (if necessary) manually cleaned with a cleaning cloth and possibly with the aid of a detergent solution.
  • the inspection doors which can be designed as sliding doors or swing doors, also form part of the interior cleaning system.
  • the unloading zone of the conveyor-type dishwasher is only briefly spray-washed with water since it is generally least soiled.
  • the entire cleaning operation for a conveyor-type dishwasher takes between 30 and 40 minutes depending on the size of the machine, with the quantity of fresh water used for cleaning the machine being between 400 and 600 liters.
  • the invention is based on the object of specifying a dishwasher of the type cited in the introductory part in which the cleaning operation which has to be carried out at the end of a working day can be made more efficient.
  • a particular objective is to specify a dishwasher in which at least some of the working steps which are required for cleaning the dishwasher are carried out automatically in order to thus save on personnel and at the same time to be able to reduce the resources (water, energy, chemicals) used for cleaning purposes.
  • the invention is based on the object of specifying a corresponding method for automatically cleaning a dishwasher.
  • a dishwasher of the kind mentioned in the introductory part for the at least one wash tube in which the plurality of spray nozzles is formed to have a central cleaning opening which is formed in such a way that at least some of the wash liquid which is supplied to the wash tube by the wash pump flows back into the wash tank via the central cleaning opening in a cleaning mode of the dishwasher.
  • the advantages which can be achieved by the solution according to the invention may include: since the at least one wash tube of the wash system has an associated central cleaning opening which is open in the cleaning mode of the dishwasher, so that at least some of the wash liquid which is supplied to the wash tube by the wash pump can flow back into the wash tank via the central cleaning opening, the result is that the wash arm (wash tube with the spray nozzles correspondingly formed therein) no longer have to be removed from the dishwasher for the purpose of cleaning the dishwasher. Instead, the at least one wash arm remains in the wash zone during the cleaning process and is automatically flushed. As a result, the process of removing the individual wash arms, which process usually has to be implemented manually and is time-consuming, and of manually cleaning said individual wash arms outside the dishwasher in a state in which they are uninstalled is dispensed with.
  • the at least one wash tube of the wash system in which the plurality of spray nozzles are formed to have a central cleaning opening which is formed in such a way that at least some of the wash liquid which is supplied to the wash arm by the wash pump flows back into the wash tank via the central cleaning opening in a cleaning mode of the dishwasher.
  • the central cleaning opening of the at least one wash tube is, in this case, opened and then the wash pump, which is connected to the at least one wash tube, is actuated in such a way that wash liquid is supplied to the spray nozzles, which are formed in the at least one wash tube, from the wash tank, wherein at least some of the wash liquid which is supplied to the wash tube by the wash pump flows back into the wash tank via the central cleaning opening.
  • the wash system has a plurality of wash tubes which together form a set of wash arms, wherein the plurality of wash tubes is connected to the wash pump by means of a preferably common line system, and wherein the abovementioned central cleaning opening is associated with the entire set of wash arms and is formed in such a way that at least some of the wash liquid which is supplied to the plurality of wash tubes by the wash pump flows back into the wash tank via this common central cleaning opening in a cleaning mode of the dishwasher.
  • a closure element which can be manually operated or can be automatically actuated, is associated with the central cleaning opening for the purpose of selectively opening the central cleaning opening in a cleaning mode of the dishwasher and for the purpose of selectively closing the central cleaning opening in a washing mode of the dishwasher.
  • the closure element it is also feasible in this case for the closure element to be designed as a valve which can be automatically actuated by means of a control device.
  • the closure element it goes without saying that it is also feasible for the closure element to be in the form of a valve which can be manually operated or in the form of a closure which can be manually removed from the central cleaning opening.
  • the solution according to the invention is distinguished not only by virtue of the individual wash arms remaining in their mounted state and being automatically flushed in the cleaning mode of the dishwasher, but also by virtue of an intelligent monitoring means with which a check is made before or during the course of the automatic cleaning program to determine whether the central cleaning opening is open.
  • a control device for actuating the wash pump in a washing mode of the dishwasher in such a way that wash liquid is at least temporarily supplied to the spray nozzles by means of the line system.
  • a sensor device which is connected to the control device, is provided, said sensor device being used for detecting a hydrostatic pressure profile of the wash liquid in the line system or a volumetric-flow profile of the wash liquid in the line system, wherein the control device is designed for comparing the detected pressure profile or the detected volumetric-flow profile with a predefined pressure profile or, respectively, with a predefined volumetric-flow profile.
  • a corresponding fault message is preferably output by means of an acoustic and/or optical interface.
  • a screen system which forms part of the wash system In the case of the solution according to the invention - as in the case of conventional cleaning of dishwashers - it is still necessary for a screen system which forms part of the wash system to be manually removed from the dishwasher before the cleaning process is started.
  • a detector device which is connected to a control device, to be associated with this screen system, said detector device being used for automatically detecting whether the screen system is in its state in which it is installed in the dishwasher. It is feasible in this case, for example, for this detector device to have an optically, capacitively or inductively operating sensor, in particular a Hall sensor, and/or a switch, in particular a reed switch.
  • control device of the dishwasher prefferably be designed to actuate the wash pump in a washing mode of the dishwasher only when the detector device detects that the screen system is in its state in which it is installed in the dishwasher, wherein the control device is further preferably designed in such a way that the wash pump is actuated in a cleaning mode of the dishwasher only when the detector device detects that the screen system is no longer in the state in which it is installed in the dishwasher.
  • a cleaning system which has at least one interior cleaning nozzle which is arranged in the treatment chamber (in the case of box-type dishwashers) or in the respective treatment zone (in the case of conveyor-type dishwashers) and can be connected to a fresh-water connection of the dishwasher by means of a fresh-water line system.
  • This at least one interior cleaning nozzle is preferably designed to spray the relevant treatment zone or the treatment chamber with fresh water from the inside in a cleaning mode of the dishwasher, wherein the interior cleaning nozzle is, for example, in the form of an all-round spray nozzle.
  • fig. 1 schematically shows a dishwasher, which is designed in the form of a conveyor-type dishwasher, according to one exemplary embodiment of the invention
  • fig. 2 schematically shows a dishwasher, which is designed in the form of a conveyor-type dishwasher, according to a further exemplary embodiment of the invention
  • fig. 3a schematically shows the design of a wash system for a dishwasher, which is in the form of a conveyor- type dishwasher or in the form of a box-type dishwasher, in the washing mode of the dishwasher
  • fig. 3b shows the wash system shown in fig. 3a in the cleaning mode of the dishwasher
  • FIG. 4 schematically shows the design of a further wash system for a dishwasher, which is in the form of a conveyor-type dishwasher or in the form of a box- type dishwasher, in the cleaning mode of the dishwasher;
  • fig. 5a schematically shows a first embodiment of a set of wash arms which can be used in the solution according to the invention;
  • fig. 5b schematically shows a further embodiment of a set of wash arms which can be used in the solution according to the invention.
  • Fig. 1 shows a schematic longitudinal section through a conveyor-type dishwasher 50 as an example of the solution according to the invention.
  • the conveyor-type dishwasher 50 according to the illustration in fig. 1 has a prewash zone 51 and a main-wash zone 52 which is arranged downstream of the prewash zone 51 as seen in the transportation direction T of the washware (not illustrated in fig. 1) .
  • a post-wash zone 53 and a final- rinse zone 54 are arranged downstream of the main-wash zone 52 in the case of the conveyor-type dishwasher 50 illustrated in fig. 1.
  • the washware which is either accommodated directly on the conveyor belt 58 or is retained by racks, runs, in the transportation direction T, through an inlet tunnel 55, the following prewash zone 51, the main-wash zone 52, the post-wash zone 53, the final-rinse zone 54 and through a drying zone 56, into an outlet section 57.
  • the abovementioned treatment zones 51, 52, 53, 54 of the conveyor-type dishwasher 50 each have associated spray nozzles 13-1, 13-2, 13-3, 134, 13-5 via which liquid is sprayed onto the washware which is transported through the respective treatment zones 51, 52, 53, 54 by the conveyor belt 58.
  • the spray nozzles 13-1, 13-2 of the wash system 10- 1, 10-2 which is associated with the prewash zone 51 and the main-wash zone 52 are in each case formed in an upper and a lower wash tube 15-1, 15-2, and therefore corresponding wash arms are used in these treatment zones.
  • the wash systems 10-1, 10-2, 10-3 used to have a plurality of wash tubes 15-1, 15-2 which form a set of wash arms, wherein the plurality of wash tubes is connected to the corresponding wash pump 11-1, 11-2, 11-3 by means of a preferably common line system 12-1, 12-2, 12-3.
  • At least each wash zone has an associated tank (wash tank 14-1, 14-2, 14-3) in which sprayed liquid is accommodated, and/or in which liquid is provided for the spray nozzles 13-1, 13-2, 13-3 of the relevant zones 51, 52, 53.
  • the prewash zone 51, the main-wash zone 52 and the post-wash zone 53 of the conveyor-type dishwasher 50 according to the embodiment illustrated in fig. 1 each have a wash system 10-
  • Each wash system 10-1, 10-2, 10-3 is made up of a wash tank 14-1, 14-2, 14-3, a wash pump 11-1, 11-2, 11- 3, a line system 12-1, 12-2, 12-3 which is connected to the wash pump 11-1, 11-2, 11-3, and the spray nozzles 13-1, 13-2, 13-3 which are connected to the line system 12-1, 12-2, 12-3.
  • control device 20 which serves (amongst other things) to actuate the respective wash pumps 11-1, 11-
  • final-rinse liquid in the form of fresh water which can be mixed with further additives, for example rinse aid is sprayed onto the washware (not illustrated in fig. 1) via the spray nozzles 13-4, which are arranged above and below the conveyor belt 58, of the final- rinse zone 54.
  • laterally arranged spray nozzles 13-5 are also provided in the final-rinse zone 54.
  • the sprayed final-rinse liquid is collected in the tank (post-wash tank 14-3) of the post-wash zone 53, from which it is conveyed to the spray nozzles 13-3 (post-wash nozzles) of the post-wash zone 53 via the wash pump 11-3 which is part of the wash system 10-3 of the post-wash zone 53.
  • wash liquid is rinsed off from the washware.
  • the liquid then flows from the wash tank 14-2 of the main- wash zone 52 into the prewash tank 14-1 of the prewash zone 51.
  • the liquid in the prewash tank 14-1 is sprayed onto the washware by means of a wash pump 11-1, which is part of the wash system 10-1 of the prewash zone 51, via the spray nozzles 13-1 (prewash nozzles) of the wash system 10-1, which is part of the prewash zone 51, in order to remove coarse dirt from the washware.
  • Each wash system 10-1, 10-2, 10-3 of the conveyor-type dishwasher 50 according to fig. 1 has a sensor device 30 which is connected to the control device 20.
  • the sensor devices 30 serve to detect a profile of the hydrostatic pressure of the liquid (wash liquid) which is conveyed in the respective line system 12-1, 12-2, 12-3 of the associated wash system 10-1, 10-2, 10-3, with the aid of the associated wash pump 11-1, 11-2, 11-3, to the corresponding spray nozzles 13-1, 13-2, 13-3.
  • the detected pressure profile is then compared with a predefined desired pressure profile which is stored in a memory device which is part of the control device 20.
  • each wash system 10-1, 10-2, 10-3 also has an associated waste-water line 2-1, 2-2, 2-3 which is or can be connected to the tank (prewash tank 14-1, main-wash tank 14- 2, post-wash tank 14-3) which forms part of the corresponding treatment zone by means of a valve 3-1, 3-2, 3-3 and issues into a main waste-water line 1. Since the corresponding valves 3-1, 3-2, 3-3 can be opened, the corresponding tanks 14-1, 14-2, 14-3 can be emptied, for example, in the cleaning mode of the conveyor-type dishwasher 50.
  • the prewash zone 51, the main-wash zone 52 and the post-wash zone 53 each also have an associated cleaning system in the embodiment illustrated in fig. 1.
  • Each cleaning system has at least one interior cleaning nozzle which is arranged in the relevant treatment zone and can be connected to a fresh-water connection of the conveyor-type dishwasher 50 by means of a fresh-water line system.
  • an interior cleaning nozzle 4-1 which is in the form of an all-round spray nozzle is arranged in the prewash zone 51 in the embodiment illustrated in fig. 1, it being possible for said interior cleaning nozzle to be connected to a main fresh-water connection 5 of the conveyor-type dishwasher 50 by means of the fresh-water line system which is denoted by reference numeral "5-1".
  • an interior cleaning nozzle 4-2 which is likewise in the form of an all-round spray nozzle is arranged in the main-wash zone 52, it being possible for said interior cleaning nozzle to be connected to the main fresh-water connection 5 by means of the fresh-water line system 5-2, while the interior cleaning nozzle 4-3 which is in the form of an all-round spray nozzle can be connected to the abovementioned main fresh-water connection 5 of the conveyor-type dishwasher 50 by means of the fresh-water line system 5-3 in the post-wash zone 53.
  • An interior cleaning nozzle 4-4 which is in the form of an all-round spray nozzle is also provided at the outlet of the final-rinse zone 54, it being possible for said interior cleaning nozzle to be connected to the main fresh-water connection 5 by means of the fresh-water line system 5-4.
  • the respective treatment zones of the conveyor-type dishwasher 50 illustrated by way of example in fig. 1 are separated from one another by means of curtains 7, wherein these curtains 7 serve to prevent liquid from overflowing, in particular in the washing mode of the conveyor-type dishwasher 50.
  • Corresponding curtains 7 are also provided at the inlet and at the outlet of the conveyor-type dishwasher 50 in order to prevent vapor escaping from the conveyor-type dishwasher 50.
  • the wash tubes 15-1, 15-2 which are arranged in the corresponding wash zones (prewash zone 51, main-wash zone 52) are in each case provided with a central cleaning opening which will be described in greater detail below with reference to the illustrations in figures 3 to 5.
  • the abovementioned interior cleaning nozzles 4-1, 4-2, 4-3 and 4-4 serve to rinse off the inner wall of the corresponding treatment chambers and the separating curtains 7 with fresh water in the cleaning mode of the conveyor-type dishwasher 50. It goes without saying that the invention is not restricted to a dishwasher in which only one single interior cleaning nozzle, in particular which is in the form of an all-round spray nozzle, can be used for each of the treatment zones.
  • Fig. 3a shows a schematic view of the design of a wash system for a conveyor-type dishwasher according to the invention or a dishwasher according to the invention which is in the form of a box-type dishwasher in a washing mode of the dishwasher.
  • each wash system which is associated with a treatment zone in the case of a conveyor-type dishwasher and which is associated with the treatment chamber in the case of a dishwasher which is in the form of a box- type dishwasher, comprises a wash tank 14-1, 14-2, 14-3 and a line system 12-1, 12-2, 12-3 which is connected to the wash tank 14-1, 14-2, 14-3 by means of a wash pump 11-1, 11-2, 11- 3 in order to supply wash liquid which is stored in the wash tank 14-1, 14-2, 14-3, at least to a wash tube 15-1, 15-2 which is arranged in the corresponding treatment zone or treatment chamber.
  • a plurality of spray nozzles 13-1, 13-2 are formed in the at least one wash tube 15-1, 15-2 for the purpose of spraying the wash liquid which is supplied by means of the wash pump 11-1, 11-2, 11-3.
  • the spray nozzles are formed in the at least one wash tube 15-1, 15-2 for the purpose of spraying the wash liquid which is supplied by means of the wash pump 11-1, 11-2, 11
  • the upper wash tube 15-1 and the lower wash tube 15-2 of the wash system 10-1, 10-2 each have a central cleaning opening 8-1, 8-2 which is closed in the washing mode of the dishwasher 50, so that the wash liquid which is supplied to the corresponding wash tube 15-1, 15-2 by the wash pump 11-1, 11-2 is discharged by means of the plurality of spray nozzles 13-1, 13-2 which are formed in the wash tube 15-1, 15-2 and is sprayed onto the washware (not illustrated in fig. 3a) .
  • the wash liquid sprayed then flows back into the wash tank 14-1, 14-2 due to the force of gravity.
  • a screen system 17 is associated with the wash system 10- 1, 10-2 for the purpose of separating out solid particles of dirt from the wash liquid which is sprayed onto the washware, which is to be cleaned, by means of the spray nozzles 13-1,
  • the screen system 17 is arranged above the wash tank
  • the wash system 10-1, 10-2 illustrated in fig. 3a also has a detector device 18 which is connected to the control device 20 of the dishwasher 50 and automatically detects whether the screen system 17 is in its state in which it is correctly installed.
  • the detector device 18 can have, for example, an optically, capacitively or inductively operating sensor, in particular a Hall sensor, and/or a switch, in particular a reed switch.
  • the control device 20 of the dishwasher 50 is preferably designed in such a way that the corresponding wash pumps 11- 1, 11-2 are actuated in a washing mode of the dishwasher 50 only when the detector device 18 detects that the screen system 17 is in its state in which it is installed in the dishwasher 50.
  • the control device 20 is designed in such a way that the corresponding wash pump 11-1, 11-2 is actuated in a cleaning mode of the dishwasher 50 only when the detector device 18 detects that the screen system 17 is not in its state in which it is installed in the dishwasher 50, that is to say has been manually removed from the dishwasher 50.
  • a sensor device 30 which is connected to the control device 20 is also used and detects a hydrostatic pressure profile of the wash liquid in the line system 12-1, 12-2, 12-3. The hydrostatic pressure profile which is detected by the sensor device 30 is then compared with a prespecified pressure profile in the control device 20.
  • the control device 20 is preferably designed to output a fault message by means of an optical and/or acoustic interface (not illustrated in the drawings) when the detected pressure profile is continuously below the prespecified pressure profile in a washing mode of the dishwasher 50. It can then specifically be assumed that the central cleaning openings 8-1, 8-2 of the wash tubes 15-1, 15-2 are not closed or at least are not correctly closed.
  • the embodiment illustrated in fig. 3a also shows a cleaning system which has an interior cleaning nozzle 4-1, 4-2 which is connected to a fresh-water pump 16 by means of a fresh ⁇ water line system 5-1, 5-2.
  • Fresh water is correspondingly supplied to the interior cleaning nozzle 4-1, 4-2 in the cleaning mode of the dishwasher 50 in order to spray-wash the inner walls of the treatment zone or of the treatment chamber with fresh water from the inside and also to spray-wash the wash tubes present in the treatment zone or in the treatment chamber with fresh water from the outside.
  • the wash system 10-1, 10-2 described above with reference to the illustration in fig. 3a is illustrated in a cleaning mode of the dishwasher 50 in fig. 3b.
  • the central cleaning openings 8-1, 8-2 of the wash tubes 15-1, 15-2 are then opened and wash liquid is supplied to the wash tubes 15-1, 15-2 with the aid of the wash pump 11-1, 11- 2.
  • the central cleaning openings 8-1, 8-2 are formed in such a way that at least some of the wash liquid which is supplied to the wash tubes 15-1, 15-2 by the wash pump 11-1, 11-2 flows back into the wash tank 14-1, 14-2 by means of the central cleaning openings 8-1, 8-2 in a cleaning mode of the dishwasher 50.
  • a closure element 9-1, 9-2 which can be manually operated or can be automatically actuated, is associated with each central cleaning opening 8-1, 8-2 for the purpose of selectively opening the central cleaning opening 8-1, 8-2 in a cleaning mode of the dishwasher 50 and for the purpose of selectively closing the central cleaning opening 8-1, 8-2 in a washing mode of the dishwasher 50.
  • the closure element 9-1, 9-2 used is a valve which can be automatically actuated by means of the control device 20.
  • the closure element 9-1, 9-2 used to be a valve which can be manually operated or a closure which can be manually removed from the central cleaning opening 8-1, 8-2.
  • the central cleaning opening may be formed at the distal end of the wash tube that faces downwardly.
  • wash liquid is recirculated with the open cleaning openings 8-1, 8-2 in the cleaning mode of the dishwasher 50.
  • the wash tubes 15-1, 15-2 are flushed and the insides of the wash tubes 15-1, 15-2 are cleaned.
  • Waste-water outlet valves valves 3-1, 3-2, 3-3 in fig. 1 are then opened for the purpose of emptying the corresponding wash tanks 14-1, 14-2, 14-3 into a waste-water system.
  • the interior cleaning nozzles 4-1, 4-2, 4-3, 4-4 (fig. 1) are actuated after a prespecified time.
  • the wash arms are also cleaned from the outside, as are the wash tanks 14-1, 14-2, 14-3 of the individual wash zones 51, 52, 53 or of the treatment chamber.
  • Fig. 4 schematically shows the design of a further wash system 10-1, 10-2 for a dishwasher 50, which is in the form of a conveyor-type dishwasher or in the form of a box-type dishwasher, in the cleaning mode of the machine.
  • the embodiment illustrated in fig. 4 corresponds substantially to the embodiment shown in fig. 3b, with the exception that, in the embodiment illustrated in fig. 4, the cleaning system has an interior cleaning nozzle 4-1, 4-2 which is not connected to a fresh-water pump but rather to a central fresh-water connection 5 by means of a fresh-water line system 5-1, 5-2.
  • Fig. 5a schematically shows a first embodiment of a set of wash arms which can be used in the case of the solution according to the invention and which is preferably used when the wash system 10-1, 10-2 has a plurality of wash tubes 15- 1, 15-2.
  • the plurality of wash tubes 15-1, 15-2 can be connected to a wash pump by means of a preferably common line system.
  • a central cleaning opening 8-1, 8-2 is used for the set of wash arms, said central cleaning opening being formed in such a way that at least some of the wash liquid which is supplied to the plurality of wash tubes 15-1, 15-2 by the wash pump flows back into the wash tank by means of the central cleaning opening 8-1, 8-2 in a cleaning mode of the dishwasher 50.
  • the central cleaning opening 8-1, 8-2 is angled downward or upward in the state in which the set of wash arms are installed .
  • Fig. 5b schematically shows a further embodiment of a set of wash arms which can be used in the case of the solution according to the invention.
  • the central cleaning opening 8-1, 8-2 is arranged laterally in the state in which the set of wash arms is installed.
  • wash system 10-1, 10-2 It is particularly preferred when the wash system 10-1, 10-2,
  • 10-3 of the dishwasher which is in the form of a box-type dishwasher or in the form of a conveyor-type dishwasher has a plurality of wash tubes 15-1, 15-2 which form a set of wash arms, wherein the plurality of wash tubes 15-1, 15-2 is connected to the associated wash pump 11-1, 11-2, 11-3 by means of a preferably common line system 12-1, 12-2, 12-3, and wherein the central cleaning opening 8-1, 8-2 is formed in such a way that at least some of the wash liquid which is supplied to the plurality of wash tubes 15-1, 15-2 by the wash pump 11-1, 11-2, 11-3 flows back into the wash tank 14- 1, 14-2, 14-3 via the central cleaning opening 8-1, 8-2 in a cleaning mode of the dishwasher.
  • said dishwasher has a control device 20 for actuating the corresponding wash pump or pumps 11-1, 11-2,
  • the dishwasher can also have a sensor device 30, which is connected to the control device 20, for detecting a hydrostatic pressure profile of the wash liquid in the line system 12-1, 12-2, 12-3 and for comparing the detected pressure profile with a predefined pressure profile.
  • the control device 20 is preferably designed to output a fault message by means of an optical and/or acoustic interface if the detected pressure profile is continuously below the predefined pressure profile in a washing mode of the dishwasher.
  • a closure element 9-1, 9-2 in the form of a valve which can be actuated by means of the control device 20 is associated with the central cleaning opening 8-1, 8-2, it is feasible for the control device 20 to be designed to automatically close the valve if the detected pressure profile is continuously below the predefined pressure profile in a washing mode of the dishwasher.
  • control device 20 is designed to actuate the wash pump or pumps 11-1, 11-2, 11-3 in a washing mode of the dishwasher only when a detector device 18 detects that the screen system 17, which forms part of the corresponding wash system 10-1, 10-2, 10-3, is in its state in which it is installed in the dishwasher.
  • control device 20 is intended to be designed in such a way that it actuates the wash pump or pumps 11-1, 11-2, 11-3 in a cleaning mode of the dishwasher only when the detector device 18 detects that the screen system 17 is not in its state in which it is installed in the dishwasher.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

La présente invention se rapporte à un lave-vaisselle du type caisson qui comprend une chambre de traitement ou à un lave-vaisselle du type transporteur qui comprend au moins une zone de traitement. Un système de lavage de la chambre de traitement ou de la zone de traitement comprend un réservoir de lavage pour un liquide de lavage, une pluralité de buses de pulvérisation agencées dans au moins un tube de lavage et destinées à pulvériser le liquide de lavage sur la vaisselle, et une pompe de lavage, raccordée audit au moins un tube de lavage par un système de conduite et destinée à fournir le liquide de lavage depuis le réservoir de lavage aux buses de pulvérisation. Le ou les tubes de lavage présentent une ouverture de nettoyage centrale qui est formée de telle sorte qu'au moins une certaine quantité de liquide de lavage qui est fournie au tube de lavage par la pompe de lavage, est renvoyée au réservoir de lavage par l'intermédiaire de l'ouverture de nettoyage centrale au cours d'un mode de nettoyage du lave-vaisselle lorsque l'ouverture de nettoyage centrale est ouverte pour permettre un écoulement.
PCT/US2012/050697 2011-08-19 2012-08-14 Lave-vaisselle et procédé permettant de nettoyer automatiquement un lave-vaisselle WO2013028392A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280039918.6A CN103841873B (zh) 2011-08-19 2012-08-14 洗碗机和用于自动清洁洗碗机的方法
AU2012299228A AU2012299228B2 (en) 2011-08-19 2012-08-14 Dishwasher and method for automatically cleaning a dishwasher
EP12748141.4A EP2744385B1 (fr) 2011-08-19 2012-08-14 Lave-vaisselle et procédé permettant de nettoyer automatiquement un lave-vaisselle

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DE102011081246.6 2011-08-19
DE201110081246 DE102011081246B4 (de) 2011-08-19 2011-08-19 Spülmaschine sowie Verfahren zum automatischen Reinigen einer Spülmaschine

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WO2013028392A1 true WO2013028392A1 (fr) 2013-02-28

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DE102014206119B4 (de) * 2013-12-18 2016-09-22 BSH Hausgeräte GmbH Verfahren zum Betreiben einer Pumpe in einem Haushaltsgerät und wasserführendes Haushaltsgerät
CN105212863B (zh) * 2015-10-05 2018-11-02 陈炎杰 一种节能环保喷式洗碗机
DE102016111132A1 (de) * 2016-06-17 2017-12-21 Illinois Tool Works Inc. System zum selektiven Zuführen von Flüssigkeit zu verschiedenen Düsenanordnungen und Spülmaschine mit solch einem System
CN106073674A (zh) * 2016-08-05 2016-11-09 科普瑞（天津）厨房设备有限公司 长龙式洗碗机进口端垃圾自动清洁系统
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DE102018201218A1 (de) 2018-01-26 2019-08-01 Meiko Maschinenbau Gmbh & Co. Kg Waschsystem zum reinigen von reinigungsgut
US11000174B2 (en) * 2018-03-29 2021-05-11 Illinois Tool Works Inc. Warewasher and associated spray arm assembly
DE102019114116A1 (de) * 2019-05-27 2020-12-03 Illinois Tool Works Inc. Verfahren zum Reinigen von Besteck oder Besteckteilen, Besteckaufnahmevorrichtung zur Aufnahme von in einer Spülmaschine zu reinigendem Besteck sowie Spülmaschine
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CN103841873A (zh) 2014-06-04
CN103841873B (zh) 2017-02-15
DE102011081246B4 (de) 2014-02-06
EP2744385B1 (fr) 2015-08-05
AU2012299228A1 (en) 2014-04-10
EP2744385A1 (fr) 2014-06-25
DE102011081246A1 (de) 2013-02-21
AU2012299228B2 (en) 2015-05-21

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