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WO2005051159A1 - Dispositif de dosage pour machine a laver la vaisselle - Google Patents

Dispositif de dosage pour machine a laver la vaisselle Download PDF

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Publication number
WO2005051159A1
WO2005051159A1 PCT/EP2004/013025 EP2004013025W WO2005051159A1 WO 2005051159 A1 WO2005051159 A1 WO 2005051159A1 EP 2004013025 W EP2004013025 W EP 2004013025W WO 2005051159 A1 WO2005051159 A1 WO 2005051159A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
pump
shut
rinsing
metering
Prior art date
Application number
PCT/EP2004/013025
Other languages
German (de)
English (en)
Inventor
Bruno Gaus
Ingo Wiegand
Bruno MÄNNLE
Original Assignee
Meiko Maschinenbau Gmbh & Co. Kg
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 Meiko Maschinenbau Gmbh & Co. Kg filed Critical Meiko Maschinenbau Gmbh & Co. Kg
Publication of WO2005051159A1 publication Critical patent/WO2005051159A1/fr

Links

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
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • A47L15/4427—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids entrained in the water supply line by a pressure drop, e.g. resulting from a Venturi throat
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps

Definitions

  • the invention relates to a device for introducing a liquid, e.g. liquid detergent or rinse aid in a dishwasher.
  • a liquid e.g. liquid detergent or rinse aid in a dishwasher.
  • DE 39 03 636 C2 relates to a dishwasher with an automatic dosing device for liquid cleaners.
  • the dishwasher includes a rinsing container with an automatic dosing device for liquid cleaners, in which a separate refillable storage container provided with a refill indicator and a dosing device downstream of the container via a detergent outlet are accessible on the washing-room side for receiving the detergent.
  • the dosing device can be operated using a machine program.
  • the storage container is designed as a large-volume built-in container and can be removed in a holding unit 8 and can be pivoted out of the holding unit about a horizontal or vertical position axis for filling.
  • DE 202 17 483 AI relates to a peristaltic pump.
  • This comprises a rotating squeeze roller carrier, a squeeze tube partially wrapping around the squeeze rollers and an arcuate contact wall for the squeeze tube opposite the effective surface of the squeeze rollers.
  • the abutment wall can be moved via an adjusting lever from a position which enables the assembly with the squeeze tube to a working position which presses the squeeze tube onto the squeeze rollers.
  • the contact wall forms part of a pump housing cover, on which the adjusting lever for displacing the cover is positioned on the outside in a pivotable manner.
  • the dishwashers known from the prior art usually have at least one washing chamber and one washing water tank.
  • a circulation pump draws in rinsing water from the rinsing water tank and sprays it onto the dirty items to be washed via a spray system inside the rinsing chamber.
  • the sprayed rinse water then falls back into the rinse water tank and is drawn in again by the circulation pump and sprayed onto the wash ware.
  • To the cleaning effect of the rinse water, which is pumped in this process step is added to the rinse water cleaner.
  • the invention is based on the object of designing a metering device for metering in liquids required by the process according to the preamble of patent claim 1 in such a way that the disadvantages listed above are eliminated.
  • a pressure difference between the surface of the process-required liquid in the storage container and the dosing point in the dishwasher is used to meter in the process-required liquids, such as detergent or rinse aid, in order to meter in the process-required liquid.
  • the pressure in the storage container is higher and is generally at an ambient pressure level than the pressure which acts on the dosing point of the dishwasher.
  • An embodiment variant to provide the required pressure difference consists in placing the dosing point of the liquid required for the process in the suction line of the pump.
  • the pressure difference is used by the negative pressure in the suction line of the pump and the surface of the liquids required in the process in the storage container.
  • the pump then conveys the rinsing water together with the metered-in liquids required for the process to the spray systems present in the rinsing chamber of the dishwasher.
  • the amount of liquid required for the process can be influenced via a shut-off device.
  • the shut-off device which can be designed, for example, as a solenoid-operated valve and which is controlled by a control system, can be controlled in terms of control time, flow rates or, in the case of cleaners, by detecting the conductance or using a combination of the setting parameters mentioned.
  • the detergent concentration in the rinse water is determined on the basis of the conductance, and when the conductivity falls below a certain value, the shut-off device is actuated, so that the detergent concentration in the rinse water rises again to the predetermined value.
  • the shut-off device In addition to electromagnetically actuated valves, pneumatically or hydraulically driven actuable valves are conceivable as shut-off devices.
  • shut-off elements are less sensitive than passively actuated check valves, since the sealing gap is always opened sufficiently when the listed valve types are actuated, so that there is no deposition of contaminants in the sealing gap.
  • the shut-off devices are preferably designed as direct-acting, media-separated valves, as a result of which the valve drive does not come into contact with the medium to be metered. This has the advantage that the area which is acted upon or contacted by the liquid required for the process is as small as possible and only a few components can be made chemically resistant to the sometimes very aggressive liquids, which has a positive effect on the manufacturing costs and the service life of the shut-off elements.
  • a further embodiment variant of the solution proposed according to the invention is to generate the underpressure which is required to produce a pressure difference between the surface of the liquid required in the process in the storage container and the metering point in the automatic dishwasher by integrating a water jet pump.
  • a water jet pump can be designed very simply in the form of a venturi nozzle, which can be connected downstream of a washing pump of the dishwasher.
  • the solution proposed according to the invention of utilizing a pressure difference between a metering point and a storage container for metering in a detergent or rinse aid can be implemented both on single-chamber dishwashers and on continuous dishwashers.
  • FIG. 1 schematically shows a washing system for cleaning items to be washed in an automatic dishwasher
  • Figure 2 is a schematic representation of a rinse aid system within an automatic dishwasher
  • FIG. 3 shows an embodiment variant of a media-separate valve serving as a shut-off element for the liquid required for the process
  • Figure 4 shows a continuous dishwasher with variants for generating a pressure difference.
  • FIG. 1 shows the components of a washing system of an automatic dishwasher in a schematic manner.
  • the washing system 1 of an automatic dishwasher shown in FIG. 1 comprises a pump 7, with which washing water is circulated within the automatic dishwasher.
  • the washing system 1 of an automatic dishwasher shown in FIG. 1 also comprises a storage container 2 in which a liquid required by the process, such as e.g. a detergent or rinse aid has been added.
  • a delivery line 4 extends from the storage container 2 to a metering point 5. At the metering point 5, the delivery line 4 is connected to a suction line 6 of the pump 7.
  • a shut-off device 3 is integrated in the delivery line 4, which is shown in more detail in FIG.
  • the shut-off valve 3 as shown in FIG. 1 controls the amount of the liquid to be metered into the rinsing water, e.g. Rinse aid or detergent.
  • the shut-off device 3 can be designed as an electromagnetic valve, or also as a pneumatically or hydraulically actuated valve and is designed in all design variants such that it can be actuated by the machine control of the dishwasher.
  • the control of the shut-off device 3 can take place with regard to the control duration, with regard to the amount of the liquid required for the process to be metered in and via the detection of the conductance of the liquid required for the process.
  • the listed setting parameters several of these setting parameters can also be used in combination to control the shut-off device 3.
  • the delivery line 4 opens into the suction line 6 of the pump 7.
  • the rinsing water is conveyed into spray arms 10 on the pressure side of the pump.
  • spray arms 10 which can be accommodated opposite one another within the washing chamber 9, are designed as spray nozzles via which the items to be cleaned contained in the washing chamber 9 are cleaned.
  • a collecting basin 11 In the lower area of the rinsing chamber 9 there is a collecting basin 11, into which the rinsing water 10 flows back.
  • the liquid level within the collecting basin 11 is identified by reference number 12.
  • the suction line 6 to the pump 7 runs below the collecting basin 11 of the washing chamber 9.
  • the liquid required for the process is metered in from the reservoir 2 by means of the negative pressure generated in the suction line 6 by the pump 7 at the metering point 5.
  • rinse water is simultaneously conveyed from the collecting basin 11 into the pump 7 and sprayed onto the items to be cleaned received in the rinsing chamber 9 by means of the spray nozzles formed on the spray arms 10.
  • the pump 7 mixes the rinsing water drawn in from the collecting basin 11 and the process-related required liquid entering the suction line 6 at the metering point 5.
  • the pump 7 conveys the rinse water together with the metered-in liquid required for the process into the spray arms 10 of the wash chamber 9.
  • the mixture of wash water and liquid required for the process emerges from the spray arms 10 via spray nozzles on the side facing the items to be cleaned contained in the wash chamber 9. Via the collecting basin 11, the liquid mixture of process-related required liquid and rinsing water is fed back via the suction line 6 to the pump 7, which circulates the liquid mixture.
  • the amount of the process-required liquid that is added to the rinsing water can be regulated.
  • the pressure difference required for metering in a cleaner or rinse aid can be brought about by connecting a water jet pump 13 to the pump 7 with which the rinsing water is circulated.
  • the water jet pump 13 can be designed as a Venturi nozzle, which is connected via a line to the storage container 2, in which the liquid required for the process to be metered in is contained.
  • FIG. 2 shows the components of a rinse aid system of an automatic dishwasher.
  • FIG. 2 shows that fresh water flows into a boiler or storage tank 24 via a fresh water connection 21 provided on site.
  • the fresh water supply is released or closed by a solenoid valve 22 accommodated in the fresh water line.
  • the solenoid valve 22 is followed by a free outlet 23, via which the fresh water flows to the boiler or storage tank 24.
  • the fresh water is heated to a temperature level between 60 ° C and 80 ° C.
  • a line runs from the boiler or storage tank 24, into which the delivery line 4 for the liquid to be metered in, which is required for the process, opens at the metering point 5 into the suction line 6 of the pump 7. Heated fresh water is sucked out of the boiler 24 via the suction line 6 and the liquid required from the reservoir 2 is sucked in due to the process when the delivery line 4 is released by the shut-off device 3 required liquid and the vacuum level generated by the pump 7 on the suction side. On the suction side, the pump 7 sucks only heated fresh water in accordance with the control of the shut-off element 3 and conveys it into the rinsing chamber 9, in which it is applied to the items to be cleaned via the spray arms 10 of the spray system 8.
  • the rinse aid system 20 shown in FIG. 2 offers the possibility of adding rinse aid to the fresh water drawn in from the boiler or storage tank 24 or another liquid required for the process to rinse out the items to be cleaned contained in the rinsing chamber 9.
  • the items to be cleaned are rinsed clear with fresh water together with the liquid required via the shut-off device 3, which is required for the process.
  • the variant shown in FIG. 2 makes it possible to dispense with a separate metering pump in which the pump 7 already present in the automatic dishwasher is used to meter in the liquid required for the process.
  • the pump 7 serves to draw in the liquid required for the process from the storage container in accordance with the activation duration of the shut-off element 3.
  • This is preferably designed as a media-separated valve, as will be explained in more detail below.
  • the pressure difference ⁇ p can be built up between the suction side of the pump 7 and the storage container 2, which is completely sufficient for metering in the liquid required for the process.
  • a chamber dishwasher is shown by way of example in FIG. 2, the washing chamber 9 of which is accessible via a pivotable door 26.
  • the pressure difference ⁇ p for metering in a cleaner or rinse aid can also be generated by means of a water jet pump 13 which is connected downstream of the pump 7.
  • the water jet pump 13 is connected to the storage container 2 via a line in which a shut-off device 3 is integrated.
  • a shut-off device 3 is integrated in the storage container 2 .
  • process-related liquid i.e. Detergent or rinse aid or the like added.
  • the water jet pump 13 as shown in Figure 2 can also be designed as a Venturi nozzle.
  • the representation according to FIG. 3 is a schematic embodiment of a shut-off device 3 which is accommodated in the delivery line for the liquid required for the process.
  • the shut-off device 3 shown in FIG. 3 is preferably designed as a media-separate valve 30.
  • the embodiment variant of the media-separated valve 30 shown in FIG. 3 represents a solenoid valve.
  • the solenoid valve comprises an excitable solenoid 31.
  • a spring 32 is embedded in the solenoid 31.
  • the spring 32 is supported on a housing of the solenoid valve shown in FIG. 3.
  • the spring 32 acts on an armature 33.
  • the armature 33 is connected to a flexible membrane 34 at a connection point 36.
  • the membrane 34 made of flexible material is clamped at clamping points 35 and can be moved by means of the armature 33 when the magnet coil 31 is excited.
  • the membrane 34 made of flexible material In the closed state, ie the non-energized solenoid 31 of the solenoid valve, the membrane 34 made of flexible material is in its closed state.
  • the on A tube 34 made of flexible material resting on a tube closes the top of the tube and thus the opening cross-section 38.
  • the liquid required in the delivery line 4, which is required for the process, is prevented from passing through the opening cross-section 38 which is closed by the deflectable membrane 34. An overflow in the flow direction 37 through the pipe into the delivery line 4 is consequently avoided.
  • the armature 33 opens against the action of the spring 32 of the media-separated valve 30. Since the armature 33 is connected to the deflectable membrane 34 at the connection point 36, the membrane 34 is deformed upward. Because of this, the membrane 34 lifts off on the upper end face of the tube in the delivery line 4 and releases the flow cross section 38. The chemically aggressive liquids required by the process are sealed off from contact with the armature 33 by the deflectable membrane 34.
  • the process-related liquid flows in the delivery line 4 in the flow direction 37 through the released opening cross-section 38 into the pipe and further towards the dosing point 5, at which the delivery line 4 for metering in the process-required liquid into the suction line 6 Pump 7 opens.
  • an admixture of process-related liquid is added to the fresh water, which is conveyed from the boiler or the storage tank 24 for rinsing or the rinsing water according to the in Figure 1 shown embodiment variant is added.
  • the activation duration of the media-separate valve serving as shut-off device 3 can be freely selected and stored within the machine control of the dishwasher. Furthermore, the control of the media-separated valve 30 serving as shut-off device 3, as shown in FIG. 3, can take place depending on the amount of the liquid required for the process, be it for rinsing water or fresh water.
  • the conductance of the liquid required for the process, which is to be added to either the fresh water or the rinsing water, can also be used as a setting parameter for the time period in which the media-separated valve 30 serving as a shut-off device 3 releases the opening cross section 38 for the passage of the liquid required for the process ,
  • the illustration according to FIG. 4 shows a schematically represented automatic dishwasher.
  • the continuous dishwashing machine shown in FIG. 4 has an endless conveyor belt, on which 40 items 41 are transported through the dishwasher in the working direction.
  • the endless conveyor belt is loaded within a machine inlet 46;
  • the cleaned items 41 are removed from the conveyor belt at the machine outlet 47.
  • the dishwasher according to the illustration in FIG. 4 comprises a washing zone 1, a rinse zone 20 and a drying zone 45. Inside the rinse zone 20 there is a circulation circuit for rinse and a fresh water rinse 44.
  • the rinsing water collected in the collecting basin 11 is fed via the suction line 6 to the pump 7, which in turn supplies the spray nozzles of the spray system 8 with rinsing water.
  • the flushing water level in the collecting basin 11 is indicated by reference number 12.
  • the delivery line 4, in which a shut-off device 3 is integrated, opens into the suction line 6 at the metering point 5.
  • the shut-off device 3 controls the amount of the liquid which is removed from the storage container 2 and is required for the process and which is introduced into the suction line 6 at the metering point 5.
  • the pressure difference between the dosing point 5 and the storage container 2 is indicated by ⁇ p.
  • a certain amount of a cleaner can be metered into the suction line 6 of the washing pump 7 via the delivery line 4 at the metering point 5.
  • a further embodiment variant for metering in a cleaner within the washing zone 1 consists in connecting a water jet pump 13 to the pump 7.
  • the water jet pump 13 is also connected via a further delivery line 4, in which a shut-off element 3 is received, with which the reservoir 2 required to be stored due to the method is connected.
  • the negative pressure for metering in the liquid required for the process is generated by the water jet pump 13, in which case a cleaner is mixed into the rinsing water which is circulated in the washing zone 1.
  • FIG. 4 also shows that the rinse zone 20 comprises a fresh water rinse 44.
  • a fresh water rinse 44 This is supplied from a storage tank or boiler 24 containing heated fresh water, to which a pump 7 can be connected upstream.
  • the delivery line 4 which contains a shut-off device 3, opens at the metering point 5.
  • the delivery line 4 is also connected to the storage container 2, in which the liquid required for the process is accommodated.
  • the storage tank or Boiler 24, the fresh water is supplied via a solenoid valve 22, optionally with the interposition of a free drain 23 from a fresh water connection 21 provided by the customer.
  • Rinse aid system 1-chamber dishwasher / rinse zone, passage through dishwasher, fresh water connection provided by customer, solenoid valve, free outlet, boiler / storage tank, pressure difference, drain on door

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

La présente invention concerne un dispositif et un procédé pour doser un liquide nécessaire à la mise en oeuvre du procédé, dans une machine à laver la vaisselle qui présente une chambre de lavage (9) comprenant un système de lavage (1) et un système de rinçage (20). La chambre de lavage (9) est alimentée en eau de lavage à faire circuler ou en eau de rinçage, par une pompe (7). Les liquides nécessaires à la mise en oeuvre du procédé, sont dosés dans l'eau de circulation ou l'eau de rinçage, par une différence de pression ( DELTA p) entre un emplacement de dosage (5) et la pression qui agit dans le réservoir de stockage (2) sur le liquide nécessaire à la mise en oeuvre du procédé.
PCT/EP2004/013025 2003-11-28 2004-11-17 Dispositif de dosage pour machine a laver la vaisselle WO2005051159A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10356353.9 2003-11-28
DE2003156353 DE10356353A1 (de) 2003-11-28 2003-11-28 Dosiervorrichtung für Geschirrspülautomaten

Publications (1)

Publication Number Publication Date
WO2005051159A1 true WO2005051159A1 (fr) 2005-06-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/013025 WO2005051159A1 (fr) 2003-11-28 2004-11-17 Dispositif de dosage pour machine a laver la vaisselle

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WO (1) WO2005051159A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019112483A1 (de) * 2019-05-13 2020-11-19 Tjare Schlemminger Geschirrspüler

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE710636C (de) * 1938-12-25 1941-09-18 Paul Neumann Geschirrspuelmaschine
US3166096A (en) * 1961-10-03 1965-01-19 Lang Helmut Dispenser for liquid additives to fluid streams
CH421412A (de) * 1963-09-20 1966-09-30 Nikolaus Nalbach Adolf Reinigungsautomat zum Waschen und Spülen von Geschirr, Kannen, Gläsern od. dgl. Artikel
DE1503825A1 (de) * 1965-03-05 1969-10-02 Lang Appbau Gmbh Vorrichtung fuer Geschirrspuelmaschinen zum mengenproportionalen Einbringen von Spuelmittel in die unter Druck stehende Waschwasserzuleitung
US4218264A (en) * 1979-03-09 1980-08-19 Federighi George B Dishwasher utilizing pump impeller suction for feeding detergent, sanitizing agent and rinse aid in timed sequences
DE9007642U1 (de) * 1990-06-09 1993-07-15 Henkel KGaA, 4000 Düsseldorf Gewerbliche Geschirrspülmaschine mit Injektordüse
DE19940645A1 (de) * 1999-08-26 2001-03-08 Henkel Ecolab Gmbh & Co Ohg Spülverfahren und Spülmaschine
DE10114256A1 (de) * 2001-03-22 2002-10-02 Henkel Kgaa Dosiersystem für Waschsubstanzen

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DE3215854A1 (de) * 1982-04-28 1983-11-03 Siemens AG, 1000 Berlin und 8000 München Waschmitteleinspuelvorrichtung
IT1232079B (it) * 1989-04-05 1992-01-23 Elbi Int Spa Dispositivo erogatore di liquido in particolare erogatore di detersivo per una macchina lavatrice
DE19641742A1 (de) * 1996-10-10 1998-04-23 Henkel Ecolab Gmbh & Co Ohg Dosierung von Waschmittelpasten
DE20009023U1 (de) * 2000-05-19 2000-09-07 GEMÜ Gebrüder Müller Apparatebau GmbH & Co. KG, 74653 Ingelfingen Membranventil
DE10295830B4 (de) * 2001-01-19 2007-11-08 Shin, Jae-Hyun Hydraulisch und pneumatisch betriebenes Membranventil

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE710636C (de) * 1938-12-25 1941-09-18 Paul Neumann Geschirrspuelmaschine
US3166096A (en) * 1961-10-03 1965-01-19 Lang Helmut Dispenser for liquid additives to fluid streams
CH421412A (de) * 1963-09-20 1966-09-30 Nikolaus Nalbach Adolf Reinigungsautomat zum Waschen und Spülen von Geschirr, Kannen, Gläsern od. dgl. Artikel
DE1503825A1 (de) * 1965-03-05 1969-10-02 Lang Appbau Gmbh Vorrichtung fuer Geschirrspuelmaschinen zum mengenproportionalen Einbringen von Spuelmittel in die unter Druck stehende Waschwasserzuleitung
US4218264A (en) * 1979-03-09 1980-08-19 Federighi George B Dishwasher utilizing pump impeller suction for feeding detergent, sanitizing agent and rinse aid in timed sequences
DE9007642U1 (de) * 1990-06-09 1993-07-15 Henkel KGaA, 4000 Düsseldorf Gewerbliche Geschirrspülmaschine mit Injektordüse
DE19940645A1 (de) * 1999-08-26 2001-03-08 Henkel Ecolab Gmbh & Co Ohg Spülverfahren und Spülmaschine
DE10114256A1 (de) * 2001-03-22 2002-10-02 Henkel Kgaa Dosiersystem für Waschsubstanzen

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