EP1296586B1 - Method for operating a dishwashing machine - Google Patents

Method for operating a dishwashing machine Download PDF

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Publication number
EP1296586B1
EP1296586B1 EP01933763A EP01933763A EP1296586B1 EP 1296586 B1 EP1296586 B1 EP 1296586B1 EP 01933763 A EP01933763 A EP 01933763A EP 01933763 A EP01933763 A EP 01933763A EP 1296586 B1 EP1296586 B1 EP 1296586B1
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EP
European Patent Office
Prior art keywords
cleaning liquid
pressure
liquid
gaseous
conveyed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP01933763A
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German (de)
French (fr)
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EP1296586A2 (en
Inventor
RĂ¼diger EIERMANN
Hans-Peter Nannt
Helmut Jerg
Ignacio Perez-Nivela
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1296586A2 publication Critical patent/EP1296586A2/en
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/0002Washing processes, i.e. machine working principles characterised by phases or operational steps
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00Washing methods characterised by the use of a particular treatment
    • A47L2601/03Pressurised, gaseous medium, also used for delivering of cleaning liquid

Definitions

  • the invention relates to a method for operating a dishwasher in the is cleaned with a cleaning liquid.
  • a Dishwasher using such a method is known from document DE 1 503 853.
  • This cleaning liquid is usually by means of a circulation pump, the z. B. can be designed as a centrifugal pump, from a constantly refilling Storage container conveyed via liquid feed lines to spray devices, by means of which the liquid is applied to the items to be cleaned.
  • a sufficient cleaning result is achieved when the Good to be cleaned by the amount of chemical additives that the cleaning liquid can be added, but mainly by a sufficient Duration of exposure to the goods to be cleaned and the duration of the time mechanical removal of dirt on the goods to be cleaned achieved. This means, in addition to what is necessary for conveying the cleaning liquid Energy expenditure a long duration of the cleaning program.
  • the liquid With conventional pumping methods, e.g. B. with ordinary pumps, the liquid must be below inflow own hydrostatic pressure from a reservoir into the pump.
  • the active, moving part of the pump in the case of the centrifugal pump the impeller, generates one Vacuum and sucks the liquid into the pump.
  • This negative pressure is caused by the Limited supply of the liquid. If the hydrostatic pressure on the suction side is not is sufficient to press a sufficient amount of liquid into the pump and the Limiting the above-mentioned negative pressure can be achieved by the suction nozzle Absolute pressure drop below the vapor pressure of the liquid, which has the consequence that the Liquid evaporates and now steam, instead of the liquid, gets into the pump. As a result, the delivery rate to a fraction of the intended Flow rate drops. Furthermore, in this process - called cavitation - there is a excessive noise from condensation of the vapor bubbles is caused.
  • the liquid is tried, as already described above under its own sufficient hydrostatic pressure, e.g. B. from a storage container, to flow into the pump.
  • a minimum height of the liquid e.g. B. in said storage container
  • NPSH Net Positive Suction Head
  • the liquid cannot always be guaranteed, because this z. B. in one Dishwasher is not spatially possible and the structure of the dishwasher complicated and time-consuming or because an additional template is required Mass of liquid that is basically unused for the operation is undesirable.
  • the invention is therefore based on the object of a method for operating a To create a dishwasher of the type mentioned, in which energy and Water can be saved and there are no special inlet requirements for its use must be observed.
  • This object is achieved in that the cleaning liquid by means of of a pressurized, gaseous pumped medium.
  • the cleaning liquid is by means of a pressurized, gaseous medium conveyed at intervals. If the goods to be cleaned are acted on at intervals, everyone does so At the beginning of the application, an increase in pressure in the application cleaning liquid as well as at each end of the application a drop in the pressure in the application Cleaning fluid. In practice it has been shown that the alternating Rise and fall of the pressure of the cleaning liquid and the pressure caused alternating increases and decreases on the pollution the mechanical forces to be cleaned, a sufficient cleaning result with a shorter one compared to the prior art described above Duration of exposure is reached, which means the duration of the cleaning program is shortened.
  • the cleaning liquid is conveyed impulsively, with which the alternating rise and fall of the pressure of the cleaning liquid and the alternating rise and fall of the mechanical forces acting on the dirt on the goods to be cleaned very short period of time. in practice it has been shown that this Significant improvement in the cleaning result with a shorter duration of exposure of the items to be cleaned can be achieved.
  • Pulse duration becomes the cleaning effect of the pressurized goods applied cleaning fluid optimized.
  • the clocked pumping method is achieved by that the gaseous medium is pumped in one cycle, z. B. piston or diaphragm pump, etc. is promoted.
  • the gaseous delivery medium can also be clocked from a supply source Applying the cleaning liquid.
  • the cleaning liquid is by means of a Tactical plug process promoted, in which the cleaning liquid through the gaseous Pumped medium is pressurized, which alternates between two pressure levels is changed so that at a low pressure level at which a negative pressure prevails, sucked in and by applying the higher pressure level at which a Overpressure prevails, the cleaning liquid is conveyed in the desired direction of delivery becomes.
  • the cleaning fluid can still be low Inlet height can be sucked in in sufficient quantity.
  • the cleaning liquid is forced to be delivered through repression. Since the gaseous medium is also sucked in for compression must, with this measure, this already existing negative pressure also used to promote the cleaning liquid, especially for acceleration the flow of a new amount of cleaning fluid to be pumped.
  • the gaseous medium is expediently air, which is the most common Occurring gas is used to promote the cleaning liquid.
  • a partial program step "Drying" the gaseous medium into a treatment room the dishwasher passed, whereby the already existing gaseous medium - the air - when drying by blowing off the to be cleaned Well-preserved moisture, the drying result improves and the duration of the Sub-program step "drying" significantly shortened.
  • the cleaning liquid with that in the household dishwasher 25 water to be cleaned is not shown, that may be mixed with detergents or rinse aids and possibly also with worn ones Leftovers is dirty.
  • the household dishwasher 25 has a washing container 26 for placing and Rinsing of not shown goods to be cleaned, which by - in household dishwashers usually pivotable about a horizontal axis - not closer described door can be closed.
  • Dishwashing baskets are in the washing compartment 26 27, 28 arranged, in which the material to be cleaned, not shown, for. B. cutlery, plates, Cups, glasses, etc., which is classified with the cleaning liquid Spray devices, e.g. B. so-called spray arms 29, 30 according to the invention Procedure is applied.
  • the pump pot 9 or drain pan which collects from that arranged in crockery baskets, not shown, to be cleaned Cleaning fluid.
  • the cleaning liquid is cleaned by means of a pressurized gaseous medium, in the described embodiment of the invention Process promoted at intervals and impulsively.
  • the gaseous Pumped medium in the described embodiment is air.
  • the process is carried out by means of a clocked pump process, in the described execution process by means of a clock test method, in one described below, best seen in Fig. 2, device 1 promoted.
  • the device 1 for conveying the cleaning liquid in the exemplary embodiments shown has an arrangement 10 in which the gaseous medium is conveyed a compressor 2 is pressurized. In the direction of flow of the gaseous medium after the compressor 2, that is to say at a pressure outlet 3 of the compressor a pressure vessel 4 is connected into which the gaseous medium is introduced and is stored.
  • the arrangement 10 has one with the pump pot 9 fluid-pressure-connected pressure chamber 11.
  • the gaseous medium controlled by a valve 5, introduced.
  • This valve 5 to control the introduction of the gaseous medium into the pressure chamber 11 is in the described embodiment in a connecting line 21 between the Pressure vessel 4 and an inlet 20 of the gaseous medium into the pressure chamber 11 arranged.
  • a liquid drain 12 With the pressure chamber 11 and the pump pot 9 is a liquid drain 12 connected liquid-conducting.
  • a valve 15 in the described embodiment Opening and closing the connection between the pump pot 9 and the pressure chamber 11 arranged, which in the embodiment is a check valve with a spherical Closing body is that a liquid leak from the pump pot 9 when a closes flow directed against the pump pot 9.
  • a valve 16 for opening and closing the liquid drain 12 is arranged in the exemplary embodiment is a check valve with a spherical closing body, which Liquid drainage 12 when one occurs against the pump pot 9 or against the Liquid drain closes 12 directed flow.
  • the pressure chamber 11 has one further with a valve 17 controlled input 18 to which a vent line 19 is connected.
  • the entry 20 of the gaseous medium into the pressure chamber 11 is in the use position, i.e. H. from a frontal view of Figures 1 and 2, above and the Entry of the liquid line 13, d. H. the branch 14, arranged below.
  • the arrangement furthermore has a connection 22 between the exemplary embodiment the liquid discharge line 12 and the compressor 2 for the gaseous medium, in Embodiment shown between the liquid drain 12 and the pressure vessel 4 on.
  • the connection 22 there is a further valve 6 for controlling the introduction of the gaseous delivery medium arranged in the liquid discharge line 12.
  • connection 23 between the pressure chamber 11 and a Suction line 7 of the compressor 2, the suction line 7 of the compressor 2 in the flow direction of the gaseous medium before the branch for the connection 23 with the valve 17 and further with a valve 17 controlled input 20 of the Pressure chamber 11 opposite another valve 8 for opening or closing the suction line 7 the surrounding area.
  • Valves 5, 6, 8 and 16 are initially closed, valves 15 and 17 are open.
  • the liquid extends in the pump bowl 9 to the liquid level N1 and in the pressure chamber 11 due to the suction function of the Vacuum to the much higher liquid level N1 '.
  • By closing the Valve 17 and simultaneous opening of the valve 5 is that under an overpressure gaseous delivery medium introduced into the pressure chamber 11, causing the liquid is displaced to a lower liquid level N2.
  • the valve 15 closed and the valve 16 opened so that the liquid continues into the liquid drain 12 penetrates, taking an equal amount of liquid from the liquid drain 12 is moved to the spray arms 29, 30.
  • the valve 8 opened so that the compressor 2 can suck in gas and a pressure and Volume equalization of the gas takes place.
  • valve 5 is closed and the rest Valve 6 for controlling the introduction of the gaseous medium into the liquid discharge 12 can be opened - or it can, in reverse order, first the further valve 6 for controlling the introduction of the gaseous medium into the Liquid drain 12 opened and then the valve 5 are closed -, which in both alternative process steps, the gaseous medium into the liquid discharge 12 is passed and the second application of the higher pressure level to Pressurization of the liquid takes place, causing a reprint the liquid located in the liquid discharge line 12 is effected so that again Liquid is moved to the spray arms 29, 30.
  • the valve 16 is closed.
  • valve 6 and valve 8 are also closed and valve 17 opened, thereby the gaseous pumping medium located in the pressure chamber 11 via the vent line 19 and the suction line 7 is passed to the compressor 2 and a negative pressure arises in the pressure chamber 11.
  • the valve 15 By the vacuum or, in the event that the valve 15 is not a check valve, by external control, the valve 15 now opens, so that Liquid from the pump chamber due to the negative pressure prevailing in the pressure chamber 11 9 is sucked into the pressure chamber 11.
  • the valve 16 is held in the closed position.
  • the valve 17 is closed and at the same time the valve 8 is opened again. This process is now repeated as long as fluid delivery is required.
  • a pause of about half a second inserted In front the reopening of the valve 5 for introducing the pressurized gaseous Delivery medium in the pressure chamber 11 is in the described embodiment a pause of about half a second inserted.
  • FIG. 3 The time course of a spray pulse generated with the method described above is shown in Fig. 3, the figure showing the timing and the water pressure generated from the time the valve 17 is opened to suck in the cleaning liquid shows in the pressure chamber 11.
  • the period of suction is designated in FIG. 3 with Ts and is about a second.
  • Ts The period of suction
  • Tp the period of suction
  • Tp the period of suction
  • Tp the period of about half a second.
  • the impulsive delivery of the cleaning liquid by opening the valve 5 a pulse height If of approximately 310 millibars in the exemplary embodiment and the pressing by opening the valve 6 with an additional pulse height In of in the exemplary embodiment approx. 90 millibars together over a time period Ti of half in the exemplary embodiment Second.
  • the ratio is the duration the time interval (Ts + Tp) of the delivery of the cleaning liquid to the Duration of the cleaning liquid Ti approximately 3: 1. With this very short pulse duration Ti becomes the cleaning effect that is applied under pressure to the items to be cleaned Cleaning fluid optimized.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)

Abstract

A method of operating a dishwasher in which items that are to be cleaned includes subjecting the items to the action of a cleaning liquid by delivering the liquid with a pressurized, gaseous delivery medium. In the method, energy and water can be saved and it is not necessary to comply with any specific inflow requirements to use the method.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer GeschirrspĂ¼lmaschine in der zu reinigendes Gut mit einer ReinigungsflĂ¼ssigkeit beaufschlagt wird. Eine GeschirrspĂ¼lmaschine, die ein solches Verfahren verwendet, ist aus Dokument DE 1 503 853 bekannt.The invention relates to a method for operating a dishwasher in the is cleaned with a cleaning liquid. A Dishwasher using such a method is known from document DE 1 503 853.

In allen bisher bekannten GeschirrspĂ¼lmaschinen, auch insbesondere in Haushalt-GeschirrspĂ¼lmaschinen, wird das zu reinigende Gut mit einer ReinigungsflĂ¼ssigkeit, die normalerweise aus Wasser, evtl. mit Beimischung von Reinigungs- oder KlarspĂ¼lmitteln, besteht, kontinuierlich beaufschlagt.In all previously known dishwashers, especially in household dishwashers, is to be cleaned with a cleaning liquid, the usually from water, possibly with the addition of detergents or rinse aids, exists, continuously applied.

Diese ReinigungsflĂ¼ssigkeit wird Ă¼blicherweise mittels einer Umwälzpumpe, die z. B. als Kreiselpumpe ausgelegt sein kann, von einem sich ständig wieder auffĂ¼llenden Vorratsbehälter Ă¼ber FlĂ¼ssigkeitszuleitungen zu SprĂ¼heinrichtungen gefördert, mittels derer die FlĂ¼ssigkeit auf das zu reinigende Gut aufgebracht wird.This cleaning liquid is usually by means of a circulation pump, the z. B. can be designed as a centrifugal pump, from a constantly refilling Storage container conveyed via liquid feed lines to spray devices, by means of which the liquid is applied to the items to be cleaned.

Ein ausreichendes Reinigungsergebnis wird bei einer derartigen Beaufschlagung des zu reinigenden Gutes durch die Menge der chemischen Zusätze, die der ReinigungsflĂ¼ssigkeit beigemischt werden können, aber hauptsächlich durch eine ausreichende Dauer der Beaufschlagung des zu reinigenden Gutes und den dabei Ă¼ber die Zeitdauer erfolgenden mechanischen Abtrag von Verschmutzungen auf dem zu reinigenden Gutes erzielt. Dies bedeutet neben dem fĂ¼r das Fördern der ReinigungsflĂ¼ssigkeit notwendigen Aufwand an Energie eine lange Dauer des Reinigungsprogrammes.A sufficient cleaning result is achieved when the Good to be cleaned by the amount of chemical additives that the cleaning liquid can be added, but mainly by a sufficient Duration of exposure to the goods to be cleaned and the duration of the time mechanical removal of dirt on the goods to be cleaned achieved. This means, in addition to what is necessary for conveying the cleaning liquid Energy expenditure a long duration of the cleaning program.

Beim Einsatz von Kreiselpumpen tritt durch die Zentrifugalwirkung eine Entmischung von Gasen bzw. Feststoffpartikeln auf, wodurch die Fördermenge und der Wirkungsgrad der Pumpe beeinträchtigt wird.When using centrifugal pumps, segregation occurs due to the centrifugal effect Gases or solid particles on, whereby the flow rate and the efficiency of Pump is affected.

Bei Ă¼blichen Pumpverfahren, z. B. mit gewöhnlichen Pumpen, muĂŸ die FlĂ¼ssigkeit unter eigenem hydrostatischen Druck aus einem Vorlagebehälter in die Pumpe einflieĂŸen. Der aktive, bewegte Teil der Pumpe, im Falle der Kreiselpumpe das Laufrad, erzeugt einen Unterdruck und saugt die FlĂ¼ssigkeit in die Pumpe ein. Dieser Unterdruck wird durch den Zulauf der FlĂ¼ssigkeit begrenzt. Wenn der hydrostatische Druck auf der Saugseite nicht ausreicht, eine ausreichende Menge an FlĂ¼ssigkeit in die Pumpe einzudrĂ¼cken und den oben genannten Unterdruck zu begrenzen, kann der sich am Saugstutzen einstellende Absolutdruck unter den Dampfdruck der FlĂ¼ssigkeit sinken, was zur Folge hat, daĂŸ die FlĂ¼ssigkeit verdampft und nunmehr Dampf, anstelle der FlĂ¼ssigkeit, in die Pumpe gelangt. Dies hat zur Folge, daĂŸ die Förderleistung auf einen Bruchteil der vorgesehenen Fördermenge absinkt. Ferner stellt sich bei diesem - Kavitation genannten Vorgang - eine Ă¼bermĂ¤ĂŸigen Geräuschentwicklung ein, die von einer Kondensation der Dampfblasen hervorgerufen wird.With conventional pumping methods, e.g. B. with ordinary pumps, the liquid must be below inflow own hydrostatic pressure from a reservoir into the pump. The active, moving part of the pump, in the case of the centrifugal pump the impeller, generates one Vacuum and sucks the liquid into the pump. This negative pressure is caused by the Limited supply of the liquid. If the hydrostatic pressure on the suction side is not is sufficient to press a sufficient amount of liquid into the pump and the Limiting the above-mentioned negative pressure can be achieved by the suction nozzle Absolute pressure drop below the vapor pressure of the liquid, which has the consequence that the Liquid evaporates and now steam, instead of the liquid, gets into the pump. As a result, the delivery rate to a fraction of the intended Flow rate drops. Furthermore, in this process - called cavitation - there is a excessive noise from condensation of the vapor bubbles is caused.

Da sich der Dampfdruck bei höheren Temperaturen und beim Vorhandensein von Feststoffpartikeln, sogenannten Keimen, erhöht, d. h. in die Nähe des Atmosphärendrucks verschoben wird, treten solche Erscheinungen beim Pumpen von warmen und verschmutzten FlĂ¼ssigkeiten, wie dies insbesondere in GeschirrspĂ¼lmaschinen der Fall ist, besonders stark und häufig auf, was zu den oben beschriebenen schweren Störungen des Betriebes, bis hin zur Zerstörung der Pumpe, fĂ¼hren kann und die oben beschriebene Ă¼bermĂ¤ĂŸige Geräuschentwicklung hervorruft.Since the vapor pressure changes at higher temperatures and when solid particles are present, so-called germs, increased, d. H. close to atmospheric pressure such phenomena occur when pumping warm and dirty Liquids, as is particularly the case in dishwashers, particularly strong and frequent on what leads to the serious disorders described above of operation, up to the destruction of the pump, and that described above causes excessive noise.

Zur Vermeidung dieser Nachteile, wird versucht, wie oben schon beschrieben, die FlĂ¼ssigkeit unter einem eigenen, ausreichenden hydrostatischen Druck, z. B. aus einem Vorlagebehälter, in die Pumpe einflieĂŸen zu lassen. Hierzu ist auf der Saugseite der Pumpe, z. B. in dem genannten Vorlagebehälter, eine Mindesthöhe der FlĂ¼ssigkeit, die sogenannte NPSH (Net Positive Suction Head), einzuhalten, wodurch der notwendige hydrostatische Druck entstehen kann. Diese - Ă¼blicherweise Zulaufhöhe genannte - Mindesthöhe der FlĂ¼ssigkeit kann allerdings nicht immer gewährleistet werden, weil dies z. B. in einer GeschirrspĂ¼lmaschine räumlich nicht möglich ist und den Aufbau der GeschirrspĂ¼lmaschine kompliziert und aufwendig macht oder weil eine dafĂ¼r benötigte Vorlage einer zusätzlichen Masse an im Grunde fĂ¼r den Betrieb ungenutzter FlĂ¼ssigkeit unerwĂ¼nscht ist.To avoid these disadvantages, the liquid is tried, as already described above under its own sufficient hydrostatic pressure, e.g. B. from a storage container, to flow into the pump. For this, on the suction side of the pump, z. B. in said storage container, a minimum height of the liquid, the so-called NPSH (Net Positive Suction Head) must be observed, which makes the necessary hydrostatic Pressure can arise. This - usually called inlet height - minimum height However, the liquid cannot always be guaranteed, because this z. B. in one Dishwasher is not spatially possible and the structure of the dishwasher complicated and time-consuming or because an additional template is required Mass of liquid that is basically unused for the operation is undesirable.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Betreiben einer GeschirrspĂ¼lmaschine der eingangs genannten Art zu schaffen, bei dem Energie und Wasser eingespart werden kann und zu dessen Anwendung keine besonderen Zulaufvoraussetzungen eingehalten werden mĂ¼ssen. The invention is therefore based on the object of a method for operating a To create a dishwasher of the type mentioned, in which energy and Water can be saved and there are no special inlet requirements for its use must be observed.

Diese Aufgabe wird erfindungsgemĂ¤ĂŸ dadurch gelöst, daĂŸ die ReinigungsflĂ¼ssigkeit mittels eines unter Druck stehenden, gasförmigen Fördermediums gefördert wird.This object is achieved in that the cleaning liquid by means of of a pressurized, gaseous pumped medium.

Bei der Förderung der ReinigungsflĂ¼ssigkeit mittels eines unter Druck stehenden, gasförmigen Fördermediums werden keine besondere Zulauf- und Ansaugbedingungen notwendig, was einen einfacheren Aufbau der GeschirrspĂ¼lmaschine ermöglicht. Da zur Förderung der ReinigungsflĂ¼ssigkeit keine Pumpe eingesetzt wird, werden keine MindesteinfĂ¼llmengen an ReinigungsflĂ¼ssigkeit benötigt, womit der Wasserverbrauch gegenĂ¼ber dem eingangs erläuterten Stand der Technik gesenkt werden kann. Daher wird fĂ¼r die Förderung der ReinigungsflĂ¼ssigkeit auch weniger Energie benötigt als fĂ¼r den kontinuierlichen Einsatz einer elektrisch betriebenen Umwälzpumpe nach dem Stand der Technik. Mit der Erfindung ist es gelungen, ein Verfahren zum Betreiben einer GeschirrspĂ¼lmaschine der eingangs genannten Art zu schaffen, bei dem Energie und Wasser eingespart werden kann und zu dessen Anwendung keine besonderen Zulaufvoraussetzungen eingehalten werden mĂ¼ssen.When conveying the cleaning liquid by means of a pressurized, gaseous one No special inlet and suction conditions are necessary, which enables a simpler construction of the dishwasher. As for promotion no pump is used in the cleaning liquid, there will be no minimum filling quantities of cleaning fluid required, with which the water consumption compared the prior art explained at the outset can be reduced. Therefore, for the Conveying the cleaning liquid also requires less energy than for the continuous Use of an electrically operated circulation pump according to the state of the art. With the invention, a method for operating a dishwasher has been achieved of the type mentioned at the beginning, in which energy and water are saved can be met and no special admission requirements are met for its application Need to become.

Nach einem bevorzugten Merkmal der Erfindung wird die ReinigungsflĂ¼ssigkeit mittels eines unter Druck stehenden, gasförmigen Fördermediums in zeitlichem Abstand gefördert. Bei einer Beaufschlagung des zu reinigenden Gutes im zeitlichen Abstand erfolgt bei jedem Beginn der Beaufschlagung ein Druckanstieg in der beaufschlagenden ReinigungsflĂ¼ssigkeit sowie bei jedem Ende der Beaufschlagung ein Abfall des Druckes in der beaufschlagenden ReinigungsflĂ¼ssigkeit. In der Praxis hat sich gezeigt, daĂŸ durch das abwechselnde Ansteigen und Abfallen des Druckes der ReinigungsflĂ¼ssigkeit und der damit verursachten abwechselnden Ansteigen und Abfallen der auf die Verschmutzungen auf dem zu reinigenden Gut wirkenden mechanischen Kräfte, ein ausreichendes Reinigungsergebnis bei einer im Verhältnis zu dem oben beschriebenen Stand der Technik kĂ¼rzeren Dauer der Beaufschlagung erreicht wird, womit die Dauer des Reinigungsprogrammes verkĂ¼rzt wird.According to a preferred feature of the invention, the cleaning liquid is by means of a pressurized, gaseous medium conveyed at intervals. If the goods to be cleaned are acted on at intervals, everyone does so At the beginning of the application, an increase in pressure in the application cleaning liquid as well as at each end of the application a drop in the pressure in the application Cleaning fluid. In practice it has been shown that the alternating Rise and fall of the pressure of the cleaning liquid and the pressure caused alternating increases and decreases on the pollution the mechanical forces to be cleaned, a sufficient cleaning result with a shorter one compared to the prior art described above Duration of exposure is reached, which means the duration of the cleaning program is shortened.

Nach einem weiteren Merkmal der Erfindung erfolgt die Förderung der ReinigungsflĂ¼ssigkeit impulsartig, womit das abwechselnde Ansteigen und Abfallen des Druckes der ReinigungsflĂ¼ssigkeit und der damit verursachten abwechselnde Ansteigen und Abfallen der auf die Verschmutzungen auf dem zu reinigenden Gut wirkenden mechanischen Kräfte in sehr kurzer Zeitdauer stattfindet. in der Praxis hat sich gezeigt, daĂŸ dadurch eine weitere, wesentliche Verbesserung des Reinigungsergebnisses bei kĂ¼rzerer Dauer der Beaufschlagung des zu reinigenden Gutes erreicht werden kann.According to a further feature of the invention, the cleaning liquid is conveyed impulsively, with which the alternating rise and fall of the pressure of the cleaning liquid and the alternating rise and fall of the mechanical forces acting on the dirt on the goods to be cleaned very short period of time. in practice it has been shown that this Significant improvement in the cleaning result with a shorter duration of exposure of the items to be cleaned can be achieved.

Nach einer bevorzugten AusfĂ¼hrungsform der Erfindung ist das Verhältnis der Dauer des zeitlichen Abstandes der Förderungen der ReinigungsflĂ¼ssigkeit zu der Dauer der Förderung der ReinigungsflĂ¼ssigkeit in etwa 3:1, wobei nach einer vorteilhaften AusfĂ¼hrungsform der Erfindung die Dauer der Förderung etwa 0,5 Sekunden ist. Mit dieser sehr kurzen Impulsdauer wird die Reinigungswirkung der unter Druck auf das zu reinigende Gut aufgebrachten ReinigungsflĂ¼ssigkeit optimiert.According to a preferred embodiment of the invention, the ratio of the duration of the time interval between the funding of the cleaning liquid and the duration of the funding the cleaning liquid in about 3: 1, whereby according to an advantageous embodiment the invention the duration of funding is about 0.5 seconds. With this very short Pulse duration becomes the cleaning effect of the pressurized goods applied cleaning fluid optimized.

Um auf einfache Art und Weise die erfindungsgemĂ¤ĂŸe Beaufschlagung des zu reinigenden Gutes zu erreichen, wird nach einer bevorzugten AusfĂ¼hrungsform der Erfindung das gasförmige Fördermedium mittels eines getakteten Pumpverfahren gefördert.In order to act in a simple manner on the cleaning according to the invention To achieve good, according to a preferred embodiment of the invention conveyed gaseous medium by means of a clocked pumping process.

Das getakte Pumpverfahren wird nach einer vorteilhaften AusfĂ¼hrungsform dadurch erreicht, daĂŸ das gasförmige Fördermedium mittels einer in einem Takt arbeitenden Pumpe, z. B. Kolben- oder Membranpumpe usw., gefördert wird.According to an advantageous embodiment, the clocked pumping method is achieved by that the gaseous medium is pumped in one cycle, z. B. piston or diaphragm pump, etc. is promoted.

Alternativ kann das gasförmige Fördermedium auch getaktet aus einer Vorratsquelle zur Beaufschlagung der ReinigungsflĂ¼ssigkeit eingeleitet werden.Alternatively, the gaseous delivery medium can also be clocked from a supply source Applying the cleaning liquid.

Nach einer bevorzugten AusfĂ¼hrungsform wird die ReinigungsflĂ¼ssigkeit mittels eines Taktpropfenverfahrens gefördert, bei dem die ReinigungsflĂ¼ssigkeit durch das gasförmige Fördermedium mit einem Druck beaufschlagt wird, der zwischen zwei Druckniveaus abwechselnd so verändert wird, daĂŸ bei einem niedrigen Druckniveau, bei dem ein Unterdruck herrscht, eingesaugt und durch Anlegen des höheren Druckniveaus, bei dem ein Ăœberdruck herrscht, die ReinigungsflĂ¼ssigkeit in die gewĂ¼nschte Förderrichtung gefördert wird. Durch das Anlegen des niedrigen Druckes kann die ReinigungsflĂ¼ssigkeit trotz niedriger Zulaufhöhe in ausreichender Menge angesaugt werden. Durch die folgende Beaufschlagung mit höherem Druck erfolgt die Förderung der ReinigungsflĂ¼ssigkeit zwangsweise durch Verdrängung. Da das gasförmige Fördermedium zum Verdichten auch angesaugt werden muĂŸ, wird mit dieser MaĂŸnahme, dieser ohnehin vorhandene Unterdruck auch zur Förderung der ReinigungsflĂ¼ssigkeit verwendet, insbesondere zur Beschleunigung des NachflieĂŸens einer neuen, zu fördernden ReinigungsflĂ¼ssigkeitsmenge. According to a preferred embodiment, the cleaning liquid is by means of a Tactical plug process promoted, in which the cleaning liquid through the gaseous Pumped medium is pressurized, which alternates between two pressure levels is changed so that at a low pressure level at which a negative pressure prevails, sucked in and by applying the higher pressure level at which a Overpressure prevails, the cleaning liquid is conveyed in the desired direction of delivery becomes. By applying the low pressure, the cleaning fluid can still be low Inlet height can be sucked in in sufficient quantity. By the following application at a higher pressure, the cleaning liquid is forced to be delivered through repression. Since the gaseous medium is also sucked in for compression must, with this measure, this already existing negative pressure also used to promote the cleaning liquid, especially for acceleration the flow of a new amount of cleaning fluid to be pumped.

ZweckmĂ¤ĂŸigerweise ist das gasförmige Fördermedium Luft, womit das am Häufigsten vorkommende Gas zur Förderung der ReinigungsflĂ¼ssigkeit verwendet wird.The gaseous medium is expediently air, which is the most common Occurring gas is used to promote the cleaning liquid.

Nach einer bevorzugten AusfĂ¼hrungsform der Erfindung wird während eines Teilprogrammschrittes "Trocknen" das gasförmige Fördermedium in einen Behandlungsraum der GeschirrspĂ¼lmaschine geleitet, wodurch das ohnehin vorhandene gasförmige Fördermedium - die Luft - beim Trocknen durch Abblasen der auf dem zu reinigenden Gut verbliebenen Feuchtigkeit, das Trocknungsergebnis verbessert und die Dauer des Teilprogrammschrittes "Trocknen" wesentlich verkĂ¼rzt.According to a preferred embodiment of the invention, during a partial program step "Drying" the gaseous medium into a treatment room the dishwasher passed, whereby the already existing gaseous medium - the air - when drying by blowing off the to be cleaned Well-preserved moisture, the drying result improves and the duration of the Sub-program step "drying" significantly shortened.

Die Erfindung wird nachstehend anhand dem in der Zeichnung dargestellten AusfĂ¼hrungsbeispiel erläutert. Es zeigen

Fig. 1
eine schematische Darstellung einer Haushalt-GeschirrspĂ¼lmaschine mit einer Vorrichtung zur AusfĂ¼hrung des erfindungsgemĂ¤ĂŸen Verfahrens,
Fig. 2
eine schematische Darstellung der Vorrichtung zur AusfĂ¼hrung des erfindungsgemĂ¤ĂŸen Verfahrens und
Fig. 3
den zeitlichen Verlauf eines SprĂ¼himpules nach dem erfindungsgemĂ¤ĂŸen Verfahren.
The invention is explained below with reference to the embodiment shown in the drawing. Show it
Fig. 1
1 shows a schematic illustration of a household dishwasher with a device for carrying out the method according to the invention,
Fig. 2
a schematic representation of the device for performing the method according to the invention and
Fig. 3
the time course of a spray pulse according to the inventive method.

Im AusfĂ¼hrungsbeispiel wird das erfindungsgemĂ¤ĂŸe Verfahren bei einer in Fig. 1 gezeigten Haushalt-GeschirrspĂ¼lmaschine 25 beschrieben, in der eine Vorrichtung 1 zur DurchfĂ¼hrung des erfindungsgemĂ¤ĂŸen Verfahrens eingebaut ist. In der beschriebenen Haushalt-GeschirrspĂ¼lmaschine 25 ist die ReinigungsflĂ¼ssigkeit mit der in der Haushalt-GeschirrspĂ¼lmaschine 25 nicht gezeigtes zu reinigendes Gut beaufschlagt wird Wasser, das ggf. mit Reinigungs- oder KlarspĂ¼lmitteln vermischt und ggf. auch mit abgetragenen Speiseresten verschmutzt ist. In the exemplary embodiment, the method according to the invention is shown in FIG Household dishwasher 25 described in which a device 1 for carrying out of the method according to the invention is installed. In the household dishwasher described 25 is the cleaning liquid with that in the household dishwasher 25 water to be cleaned is not shown, that may be mixed with detergents or rinse aids and possibly also with worn ones Leftovers is dirty.

Die Haushalt-GeschirrspĂ¼lmaschine 25 weist einen SpĂ¼lbehälter 26 zum Einordnen und SpĂ¼len von nicht gezeigtem zu reinigendem Gut auf, der durch eine - bei Haushalt-GeschirrspĂ¼lmaschinen Ă¼blicherweise um eine waagrechte Achse schwenkbaren - nicht näher beschriebene TĂ¼r verschlossen werden kann. In dem SpĂ¼lbehälter 26 sind Geschirrkörbe 27, 28 angeordnet, in die das nicht gezeigte zu reinigende Gut, z. B. Besteck, Teller, Tassen, Gläser usw., eingeordnet wird, das mit der ReinigungsflĂ¼ssigkeit durch SprĂ¼heinrichtungen, z. B. sogenannten SprĂ¼harmen 29, 30 nach dem erfindungsgemĂ¤ĂŸen Verfahren beaufschlagt wird. In einem untersten Abschnitt des SpĂ¼lbehälters 26, der Ă¼blicherweise Pumpentopf 9 oder Ablaufwanne genannt wird, sammelt sich die von dem in Geschirrkörben eingeordneten, nicht gezeigten zu reinigendem Gut zurĂ¼cklaufende ReinigungsflĂ¼ssigkeit.The household dishwasher 25 has a washing container 26 for placing and Rinsing of not shown goods to be cleaned, which by - in household dishwashers usually pivotable about a horizontal axis - not closer described door can be closed. Dishwashing baskets are in the washing compartment 26 27, 28 arranged, in which the material to be cleaned, not shown, for. B. cutlery, plates, Cups, glasses, etc., which is classified with the cleaning liquid Spray devices, e.g. B. so-called spray arms 29, 30 according to the invention Procedure is applied. In a lowermost section of the washing container 26, the is usually called pump pot 9 or drain pan, which collects from that arranged in crockery baskets, not shown, to be cleaned Cleaning fluid.

ErfindungsgemĂ¤ĂŸ wird die ReinigungsflĂ¼ssigkeit mittels eines unter Druck stehenden, gasförmigen Fördermediums, in dem beschriebenen AusfĂ¼hrungsbeispiel des erfindungsgemĂ¤ĂŸen Verfahrens in zeitlichem Abstand und impulsartig gefördert. Das gasförmige Fördermedium in dem beschriebenen AusfĂ¼hrungsbeispiel ist Luft. Das erfindungsgemĂ¤ĂŸe Verfahren wird mittels eines getakteten Pumpverfahren, im beschriebenen AusfĂ¼hrungsverfahren mittels eines Taktpropfenverfahrens, in einer im folgenden beschriebenen, am besten in Fig. 2 zu erkennenden, Vorrichtung 1 gefördert.According to the invention, the cleaning liquid is cleaned by means of a pressurized gaseous medium, in the described embodiment of the invention Process promoted at intervals and impulsively. The gaseous Pumped medium in the described embodiment is air. The invention The process is carried out by means of a clocked pump process, in the described execution process by means of a clock test method, in one described below, best seen in Fig. 2, device 1 promoted.

Die Vorrichtung 1 zur Förderung der ReinigungsflĂ¼ssigkeit in dem gezeigten AusfĂ¼hrungsbeispiele weist eine Anordnung 10 auf, in der das gasförmige Fördermedium mittels eines Verdichters 2 unter Druck gestellt wird. In Strömungsrichtung des gasförmigen Fördermediums nach dem Verdichter 2, das heiĂŸt an einem Druckausgang 3 des Verdichters ist ein Druckbehälter 4 angeschlossen, in den das gasförmigen Fördermedium eingeleitet und bevorratet wird.The device 1 for conveying the cleaning liquid in the exemplary embodiments shown has an arrangement 10 in which the gaseous medium is conveyed a compressor 2 is pressurized. In the direction of flow of the gaseous medium after the compressor 2, that is to say at a pressure outlet 3 of the compressor a pressure vessel 4 is connected into which the gaseous medium is introduced and is stored.

Die Anordnung 10 weist in dem beschriebenen AusfĂ¼hrungsbeispiel einen mit dem Pumpentopf 9 flĂ¼ssigkeitsleitend verbundenen Druckraum 11 auf. In den Druckraum 11 wird das gasförmige Fördermedium, gesteuert durch ein Ventil 5, eingeleitet. Dieses Ventil 5 zur Steuerung der Einleitung des gasförmigen Fördermediums in den Druckraum 11 ist in dem beschriebenen AusfĂ¼hrungsbeispiel in einer Verbindungsleitung 21 zwischen dem Druckbehälter 4 und einem Eintritt 20 des gasförmigen Fördermediums in den Druckraum 11 angeordnet. Mit dem Druckraum 11 und dem Pumpentopf 9 ist eine FlĂ¼ssigkeitsableitung 12 flĂ¼ssigkeitsleitend verbunden. In dem beschriebenen AusfĂ¼hrungsbeispiel ist eine FlĂ¼ssigkeitsleitung 13 von dem Pumpentopf 9 bis zur FlĂ¼ssigkeitsableitung 12 fortgesetzt, die eine Abzweigung 14 zu dem Druckraum 11 aufweist. Zwischen dem Pumpentopf 9 und dem Druckraum 11 ist bei dem beschriebenen AusfĂ¼hrungsbeispiel ein Ventil 15 zum Ă–ffnen und SchlieĂŸen der Verbindung zwischen dem Pumpentopf 9 und dem Druckraum 11 angeordnet, das im AusfĂ¼hrungsbeispiel ein RĂ¼ckschlagventil mit kugelförmigem SchlieĂŸkörper ist, das einen FlĂ¼ssigkeitsaustritt aus dem Pumpentopf 9 bei Auftreten einer gegen den Pumpentopf 9 gerichteten Strömung verschlieĂŸt. Zwischen dem Druckraum 11 und der FlĂ¼ssigkeitsableitung 12 ist bei dem beschriebenen AusfĂ¼hrungsbeispielen ein Ventil 16 zum Ă–ffnen und SchlieĂŸen der FlĂ¼ssigkeitsableitung 12 angeordnet, das im AusfĂ¼hrungsbeispiel ein RĂ¼ckschlagventil mit kugelförmigem SchlieĂŸkörper ist, das die FlĂ¼ssigkeitsableitung 12 bei Auftreten einer gegen den Pumpentopf 9 oder gegen die FlĂ¼ssigkeitsableitung 12 gerichteten Strömung verschlieĂŸt. Der Druckraum 11 weist einen weiteren mit einem Ventil 17 gesteuerten Eingang 18 auf, an den eine EntlĂ¼ftungsleitung 19 angeschlossen ist. Der Eintritt 20 des gasförmigen Fördermediums in den Druckraum 11 ist in Gebrauchslage, d. h. aus frontaler Sicht auf die Figuren 1 und 2, oben und der Eintritt der FlĂ¼ssigkeitsleitung 13, d. h. die Abzweigung 14, unten angeordnet. In dem gezeigten AusfĂ¼hrungsbeispiel weist die Anordnung weiterhin eine Verbindung 22 zwischen der FlĂ¼ssigkeitsableitung 12 und dem Verdichter 2 fĂ¼r das gasförmige Fördermedium, im gezeigten AusfĂ¼hrungsbeispiel zwischen der FlĂ¼ssigkeitsableitung 12 und dem Druckbehälter 4 auf. In der Verbindung 22 ist ein weiteres Ventil 6 zur Steuerung der Einleitung des gasförmigen Fördermediums in die FlĂ¼ssigkeitsableitung 12 angeordnet. Ferner weist die beschriebene Anordnung eine Verbindung 23 zwischen dem Druckraum 11 und einer Saugleitung 7 des Verdichters 2 auf, wobei die Saugleitung 7 des Verdichters 2 in Strömungsrichtung des gasförmigen Fördermediums vor der Abzweigung fĂ¼r die Verbindung 23 mit dem Ventil 17 des weiteren mit einem Ventil 17 gesteuerten Eingangs 20 des Druckraumes 11 ein weiteres Ventil 8 zum Ă–ffnen oder SchlieĂŸen der Saugleitung 7 gegenĂ¼ber der Umgebung aufweist.In the exemplary embodiment described, the arrangement 10 has one with the pump pot 9 fluid-pressure-connected pressure chamber 11. In the pressure chamber 11 the gaseous medium, controlled by a valve 5, introduced. This valve 5 to control the introduction of the gaseous medium into the pressure chamber 11 is in the described embodiment in a connecting line 21 between the Pressure vessel 4 and an inlet 20 of the gaseous medium into the pressure chamber 11 arranged. With the pressure chamber 11 and the pump pot 9 is a liquid drain 12 connected liquid-conducting. In the described embodiment, one is Liquid line 13 continued from the pump pot 9 to the liquid drain 12, which has a branch 14 to the pressure chamber 11. Between the pump bowl 9 and the pressure chamber 11 is a valve 15 in the described embodiment Opening and closing the connection between the pump pot 9 and the pressure chamber 11 arranged, which in the embodiment is a check valve with a spherical Closing body is that a liquid leak from the pump pot 9 when a closes flow directed against the pump pot 9. Between the pressure room 11 and the liquid drain 12 is in the described embodiments a valve 16 for opening and closing the liquid drain 12 is arranged in the exemplary embodiment is a check valve with a spherical closing body, which Liquid drainage 12 when one occurs against the pump pot 9 or against the Liquid drain closes 12 directed flow. The pressure chamber 11 has one further with a valve 17 controlled input 18 to which a vent line 19 is connected. The entry 20 of the gaseous medium into the pressure chamber 11 is in the use position, i.e. H. from a frontal view of Figures 1 and 2, above and the Entry of the liquid line 13, d. H. the branch 14, arranged below. In the shown The arrangement furthermore has a connection 22 between the exemplary embodiment the liquid discharge line 12 and the compressor 2 for the gaseous medium, in Embodiment shown between the liquid drain 12 and the pressure vessel 4 on. In the connection 22 there is a further valve 6 for controlling the introduction of the gaseous delivery medium arranged in the liquid discharge line 12. Further points the arrangement described a connection 23 between the pressure chamber 11 and a Suction line 7 of the compressor 2, the suction line 7 of the compressor 2 in the flow direction of the gaseous medium before the branch for the connection 23 with the valve 17 and further with a valve 17 controlled input 20 of the Pressure chamber 11 opposite another valve 8 for opening or closing the suction line 7 the surrounding area.

Das erfindungsgemĂ¤ĂŸe Verfahren zum Betreiben einer GeschirrspĂ¼lmaschine 25 und die darin durchgefĂ¼hrte impulsartige Förderung der ReinigungsflĂ¼ssigkeit, bei der die ReinigungsflĂ¼ssigkeit in der Anordnung durch das gasförmige Fördermedium abwechselnd mit einem Unterdruck und in einem zeitlichem Abstand mit einem Ăœberdruck beaufschlagt wird, wird im AusfĂ¼hrungsbeispiel mit der erläuterten Vorrichtung 1 wie folgt ausgefĂ¼hrt: The inventive method for operating a dishwasher 25 and impulse-like conveying of the cleaning liquid, in which the cleaning liquid in the arrangement by alternating with the gaseous medium a negative pressure and at an interval with an excess pressure is carried out in the exemplary embodiment with the illustrated device 1 as follows:

Die Ventile 5, 6, 8 und 16 sind anfänglich geschlossen, die Ventile 15 und 17 sind geöffnet. Die FlĂ¼ssigkeit erstreckt sich in dem Pumpentopf 9 auf das FlĂ¼ssigkeitsniveau N1 und in dem Druckraum 11 aufgrund der weiter unten beschriebenen Saugfunktion des Unterdruckes auf das wesentlich höhere FlĂ¼ssigkeitsniveau N1'. Durch SchlieĂŸen des Ventils 17 und gleichzeitiges Ă–ffnen des Ventils 5 wird das unter einem Ăœberdruck stehende gasförmige Fördermedium in den Druckraum 11 eingeleitet, wodurch die FlĂ¼ssigkeit bis zu einem unteren FlĂ¼ssigkeitsniveau N2 verdrängt wird. Dabei wird das Ventil 15 geschlossen und das Ventil 16 geöffnet, so daĂŸ die FlĂ¼ssigkeit weiter in die FlĂ¼ssigkeitsableitung 12 eindringt, wobei eine gleiche Menge FlĂ¼ssigkeit aus der FlĂ¼ssigkeitsableitung 12 zu den SprĂ¼harmen 29, 30 bewegt wird. In etwa gleichzeitig mit dem Ventil 5 wird auch das Ventil 8 geöffnet, damit der Verdichter 2 Gas einsaugen kann und ein Druckund Mengenausgleich des Gases erfolgt. Nun wird das Ventil 5 geschlossen und das weitere Ventil 6 zur Steuerung der Einleitung des gasförmigen Fördermediums in die FlĂ¼ssigkeitsableitung 12 geöffnet, werden - oder es kann, in umgekehrter Reihenfolge, zuerst das weitere Ventil 6 zur Steuerung der Einleitung des gasförmigen Fördermediums in die FlĂ¼ssigkeitsableitung 12 geöffnet und dann das Ventil 5 geschlossen werden -, wodurch in beiden alternativen Verfahrensschritten das gasförmige Fördermedium in die FlĂ¼ssigkeitsableitung 12 geleitet wird und das zweite Anlegen des höheren Druckniveaus zur Beaufschlagung der FlĂ¼ssigkeit mit einem Ăœberdruck erfolgt, wodurch ein NachdrĂ¼cken der in der FlĂ¼ssigkeitsableitung 12 befindlichen FlĂ¼ssigkeit bewirkt wird, so daĂŸ nochmals FlĂ¼ssigkeit zu den SprĂ¼harmen 29, 30 bewegt wird. Das Ventil 16 wird geschlossen. Nun werden auch das Ventil 6 und das Ventil 8 geschlossen und das Ventil 17 geöffnet, wodurch das in dem Druckraum 11 befindliche gasförmige Fördermedium Ă¼ber die EntlĂ¼ftungsleitung 19 und die Saugleitung 7 zum Verdichter 2 geleitet wird und ein Unterdruck in der Druckkammer 11 entsteht. Durch den Unterdruck oder, fĂ¼r den Fall, daĂŸ das Ventil 15 kein RĂ¼ckschlagventil ist, durch Fremdsteuerung, öffnet sich nun das Ventil 15, so daĂŸ FlĂ¼ssigkeit durch den in der Druckkammer 11 herrschenden Unterdruck aus dem Pumpentopf 9 in den Druckraum 11 eingesaugt wird. Das Ventil 16 wird in SchlieĂŸlage gehalten. Nun wird das Ventil 17 geschlossen und gleichzeitig wird das Ventil 8 wieder geöffnet. Dieser Vorgang wird nun solange FlĂ¼ssigkeitsförderung benötigt wird wiederholt. Vor dem erneuten Ă–ffnen des Ventils 5 zum Einleiten des unter Druck stehenden gasförmigen Fördermediums in den Druckraum 11 wird in dem beschriebenen AusfĂ¼hrungsbeispiel des erfindungsgemĂ¤ĂŸen Verfahrens eine Pause von etwa einer halben Sekunde eingelegt.Valves 5, 6, 8 and 16 are initially closed, valves 15 and 17 are open. The liquid extends in the pump bowl 9 to the liquid level N1 and in the pressure chamber 11 due to the suction function of the Vacuum to the much higher liquid level N1 '. By closing the Valve 17 and simultaneous opening of the valve 5 is that under an overpressure gaseous delivery medium introduced into the pressure chamber 11, causing the liquid is displaced to a lower liquid level N2. The valve 15 closed and the valve 16 opened so that the liquid continues into the liquid drain 12 penetrates, taking an equal amount of liquid from the liquid drain 12 is moved to the spray arms 29, 30. At about the same time as the valve 5 also the valve 8 opened so that the compressor 2 can suck in gas and a pressure and Volume equalization of the gas takes place. Now valve 5 is closed and the rest Valve 6 for controlling the introduction of the gaseous medium into the liquid discharge 12 can be opened - or it can, in reverse order, first the further valve 6 for controlling the introduction of the gaseous medium into the Liquid drain 12 opened and then the valve 5 are closed -, which in both alternative process steps, the gaseous medium into the liquid discharge 12 is passed and the second application of the higher pressure level to Pressurization of the liquid takes place, causing a reprint the liquid located in the liquid discharge line 12 is effected so that again Liquid is moved to the spray arms 29, 30. The valve 16 is closed. Now valve 6 and valve 8 are also closed and valve 17 opened, thereby the gaseous pumping medium located in the pressure chamber 11 via the vent line 19 and the suction line 7 is passed to the compressor 2 and a negative pressure arises in the pressure chamber 11. By the vacuum or, in the event that the valve 15 is not a check valve, by external control, the valve 15 now opens, so that Liquid from the pump chamber due to the negative pressure prevailing in the pressure chamber 11 9 is sucked into the pressure chamber 11. The valve 16 is held in the closed position. Now the valve 17 is closed and at the same time the valve 8 is opened again. This process is now repeated as long as fluid delivery is required. In front the reopening of the valve 5 for introducing the pressurized gaseous Delivery medium in the pressure chamber 11 is in the described embodiment a pause of about half a second inserted.

Der zeitlichen Verlauf eines mit dem oben geschilderten Verfahren erzeugten SprĂ¼himpulses ist in Fig. 3 gezeigt, wobei die Figur den zeitlichen Ablauf und den erzeugten Wasserdruck ab dem Zeitpunkt des Ă–ffnen des Ventils 17 zum Ansaugen der ReinigungsflĂ¼ssigkeit in den Druckraum 11 zeigt. Der Zeitraum zum Ansaugen ist in Fig. 3 mit Ts bezeichnet und beträgt etwa eine Sekunde. In dem beschriebenen AusfĂ¼hrungsbeispiel wird nun Ă¼ber eine Zeitdauer Tp von etwa einer halben Sekunde eine Pause eingelegt. Nun folgt die impulsartige Förderung der ReinigungsflĂ¼ssigkeit durch Ă–ffnen des Ventils 5 mit einer Impulshöhe If von im AusfĂ¼hrungsbeispiel ca. 310 Millibar und das NachdrĂ¼cken durch Ă–ffnen des Ventils 6 mit einer Impulshöhe In von im AusfĂ¼hrungsbeispiel zusätzlich ca. 90 Millibar zusammen Ă¼ber eine Zeitdauer Ti von im AusfĂ¼hrungsbeispiel einer halben Sekunde. In dem beschriebenen AusfĂ¼hrungsbeispiel ist also das Verhältnis der Dauer des zeitlichen Abstandes (Ts + Tp) der Förderungen der ReinigungsflĂ¼ssigkeit zu der Dauer der Förderung der ReinigungsflĂ¼ssigkeit Ti in etwa 3:1. Mit dieser sehr kurzen Impulsdauer Ti wird die Reinigungswirkung der unter Druck auf das zu reinigende Gut aufgebrachten ReinigungsflĂ¼ssigkeit optimiert.The time course of a spray pulse generated with the method described above is shown in Fig. 3, the figure showing the timing and the water pressure generated from the time the valve 17 is opened to suck in the cleaning liquid shows in the pressure chamber 11. The period of suction is designated in FIG. 3 with Ts and is about a second. In the described embodiment now take a break over a period Tp of about half a second. Now follows the impulsive delivery of the cleaning liquid by opening the valve 5 a pulse height If of approximately 310 millibars in the exemplary embodiment and the pressing by opening the valve 6 with an additional pulse height In of in the exemplary embodiment approx. 90 millibars together over a time period Ti of half in the exemplary embodiment Second. In the exemplary embodiment described, the ratio is the duration the time interval (Ts + Tp) of the delivery of the cleaning liquid to the Duration of the cleaning liquid Ti approximately 3: 1. With this very short pulse duration Ti becomes the cleaning effect that is applied under pressure to the items to be cleaned Cleaning fluid optimized.

Bei einer Beaufschlagung des zu reinigenden Gutes im zeitlichen Abstand erfolgt bei jedem Beginn der Beaufschlagung ein Druckanstieg in der beaufschlagenden ReinigungsflĂ¼ssigkeit sowie bei jedem Ende der Beaufschlagung ein Abfall des Druckes in der beaufschlagenden ReinigungsflĂ¼ssigkeit. In der Praxis hat sich gezeigt, daĂŸ durch das abwechselnde Ansteigen und Abfallen des Druckes der ReinigungsflĂ¼ssigkeit und der damit verursachten abwechselnde Ansteigen und Abfallen der auf die Verschmutzungen auf dem zu reinigenden Gut wirkenden mechanischen Kräfte, ein ausreichendes Reinigungsergebnis bei einer im Verhältnis zu dem oben beschriebenen Stand der Technik kĂ¼rzeren Dauer der Beaufschlagung erreicht wird, insbesondere wenn die Förderung der ReinigungsflĂ¼ssigkeit impulsartig erfolgt, wobei das abwechselnde Ansteigen und Abfallen des Druckes der ReinigungsflĂ¼ssigkeit und der damit verursachten abwechselnde Ansteigen und Abfallen der auf die Verschmutzungen auf dem zu reinigenden Gut wirkenden mechanischen Kräfte in sehr kurzer Zeitdauer und damit sehr intensiv stattfindet. If the goods to be cleaned are acted on at intervals, everyone does so At the beginning of the application, an increase in pressure in the application cleaning liquid as well as at each end of the application a drop in the pressure in the application Cleaning fluid. In practice it has been shown that the alternating Rise and fall of the pressure of the cleaning liquid and the pressure caused alternating increases and decreases on the pollution the mechanical forces to be cleaned, a sufficient cleaning result with a shorter one compared to the prior art described above Duration of exposure is reached, especially when the cleaning fluid is pumped takes place in an impulsive manner, the alternating rise and fall of the Pressure of the cleaning liquid and the alternating increase caused thereby and falling of the mechanical acting on the dirt on the goods to be cleaned Forces in a very short period of time and thus takes place very intensively.

Ferner wird bei dem beschriebenen AusfĂ¼hrungsbeispiel der Erfindung während eines Teilprogrammschrittes "Trocknen" das gasförmige Fördermedium in den SpĂ¼lbehälter 26 der Haushalt-GeschirrspĂ¼lmaschine 25 geleitet, wodurch das ohnehin vorhandene gasförmige Fördermedium - die Luft - beim Trocknen durch Abblasen der auf dem zu reinigenden Gut verbliebenen Feuchtigkeit, das Trocknungsergebnis verbessert und die Dauer des Teilprogrammschrittes "Trocknen" wesentlich verkĂ¼rzt.Furthermore, in the described embodiment of the invention during a Sub-program step "drying" the gaseous medium into the rinsing tank 26 of the household dishwasher 25 passed, whereby the already existing gaseous medium - the air - when drying by blowing off on the cleaning good remaining moisture, the drying result improves and the duration of the sub-program step "drying" is significantly reduced.

Bei der Förderung der ReinigungsflĂ¼ssigkeit mittels eines unter Druck stehenden, gasförmigen Fördermediums werden keine besondere Zulauf- und Ansaugbedingungen notwendig, was einen einfacheren Aufbau der GeschirrspĂ¼lmaschine ermöglicht. Da zur Förderung der ReinigungsflĂ¼ssigkeit keine Pumpe eingesetzt wird, werden keine MindesteinfĂ¼llmengen an ReinigungsflĂ¼ssigkeit benötigt, womit der Wasserverbrauch gegenĂ¼ber dem eingangs erläuterten Stand der Technik gesenkt werden kann. Daher wird fĂ¼r die Förderung der ReinigungsflĂ¼ssigkeit auch weniger Energie benötigt als fĂ¼r den kontinuierlichen Einsatz einer elektrisch betriebenen Umwälzpumpe nach dem Stand der Technik. Mit der Erfindung ist es gelungen, ein Verfahren zum Betreiben einer GeschirrspĂ¼lmaschine der eingangs genannten Art zu schaffen, bei dem Energie und Wasser eingespart werden kann und zu dessen Anwendung keine besonderen Zulaufvoraussetzungen eingehalten werden mĂ¼ssen.When conveying the cleaning liquid by means of a pressurized, gaseous one No special inlet and suction conditions are necessary, which enables a simpler construction of the dishwasher. As for promotion no pump is used in the cleaning liquid, there will be no minimum filling quantities of cleaning fluid required, with which the water consumption compared the prior art explained at the outset can be reduced. Therefore, for the Conveying the cleaning liquid also requires less energy than for the continuous Use of an electrically operated circulation pump according to the state of the art. With the invention, a method for operating a dishwasher has been achieved of the type mentioned at the beginning, in which energy and water are saved can be met and no special admission requirements are met for its application Need to become.

Claims (11)

  1. Method of operating a dishwashing machine (25), in which the stock to be cleaned is acted on by a cleaning liquid, characterised in that the cleaning liquid is conveyed by means of a gaseous conveying medium disposed under pressure.
  2. Method according to claim 1, characterised in that the cleaning liquid is conveyed at spacing in time by means of a gaseous conveying medium standing under pressure.
  3. Method according to claim 1 or 2, characterised in that the conveying of the cleaning liquid is carried out in pulsation-like manner.
  4. Method according to one of claims 1 to 3, characterised in that the ratio of the duration of the time spacing of the conveying phases of the cleaning liquid to the duration of the conveying of the cleaning liquid is approximately 3:1.
  5. Method according to one of claims 1 to 4, characterised in that the duration of the conveying is approximately 0.5 seconds.
  6. Method according to one of claims 1 to 5, characterised in that the gaseous conveying medium is conveyed by means of a cyclic pumping method.
  7. Method according to claim 6, characterised in that the gaseous conveying medium is conveyed by means of a pump (10) operating in a cycle.
  8. Method according to claim 6, characterised in that the gaseous conveying medium is introduced cyclically from a reservoir source (4) for action on the cleaning liquid.
  9. Method according to one of claims 1 to 6, characterised in that the cleaning liquid is conveyed by means of a cyclic stopper method in which the cleaning liquid is acted on by the gaseous conveying medium at a pressure which is so varied in alternation between two pressure levels that at a low pressure level at which an underpressure prevails it is sucked in and by application of the higher pressure level at which an excess pressure prevails the cleaning liquid is conveyed in the desired conveying direction.
  10. Method according to one of claims 1 to 9, characterised in that the gaseous conveying medium is air.
  11. Method according to one of claims 1 to 9, characterised in that during a part program step of 'drying' the gaseous conveying medium is conducted into a treatment chamber (26) of the dishwashing machine (25).
EP01933763A 2000-04-06 2001-03-27 Method for operating a dishwashing machine Expired - Lifetime EP1296586B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10017243A DE10017243A1 (en) 2000-04-06 2000-04-06 Method for operating a dishwasher
DE10017243 2000-04-06
PCT/EP2001/003486 WO2001076447A2 (en) 2000-04-06 2001-03-27 Method for operating a dishwashing machine

Publications (2)

Publication Number Publication Date
EP1296586A2 EP1296586A2 (en) 2003-04-02
EP1296586B1 true EP1296586B1 (en) 2004-02-04

Family

ID=7637866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01933763A Expired - Lifetime EP1296586B1 (en) 2000-04-06 2001-03-27 Method for operating a dishwashing machine

Country Status (8)

Country Link
US (1) US20020083966A1 (en)
EP (1) EP1296586B1 (en)
CN (1) CN1148149C (en)
AT (1) ATE258760T1 (en)
AU (1) AU6016001A (en)
DE (2) DE10017243A1 (en)
ES (1) ES2215899T3 (en)
WO (1) WO2001076447A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007017283B4 (en) 2007-04-12 2009-01-29 BSH Bosch und Siemens Hausgeräte GmbH Device for blocking a fluid passage through a tubular part by means of a check valve, in particular in a domestic appliance
EP2009165A1 (en) * 2007-06-28 2008-12-31 Bonferraro S.p.A. Operating cycle for the drain pump of a household washing appliance
US10893790B2 (en) * 2016-06-23 2021-01-19 Illinois Tool Works Inc. Warewasher with air assisted prescrapping

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1124528A (en) * 1955-04-05 1956-10-12 Liquid pump running on compressed gas
DE1503853A1 (en) * 1965-05-03 1969-05-29 Neff Werke Dishwasher
GB1338607A (en) * 1971-06-12 1973-11-28 Kingsdown Instr Co Ltd Apparatus for dispensing a predetermined and variable volume of liquid
DE3018872A1 (en) * 1980-05-16 1981-11-26 BHT Hygiene-Technik GmbH, 8000 MĂ¼nchen Cleaning system for glass chemical vessels - interrupts cleaning-liquid spray long enough for films to break on vessels

Also Published As

Publication number Publication date
DE10017243A1 (en) 2001-10-11
ES2215899T3 (en) 2004-10-16
WO2001076447A3 (en) 2002-04-11
US20020083966A1 (en) 2002-07-04
DE50101449D1 (en) 2004-03-11
ATE258760T1 (en) 2004-02-15
AU6016001A (en) 2001-10-23
CN1148149C (en) 2004-05-05
CN1383370A (en) 2002-12-04
EP1296586A2 (en) 2003-04-02
WO2001076447A2 (en) 2001-10-18

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