EP1287779B1 - Device in the water inlet of a household appliance - Google Patents

Device in the water inlet of a household appliance Download PDF

Info

Publication number
EP1287779B1
EP1287779B1 EP20020016678 EP02016678A EP1287779B1 EP 1287779 B1 EP1287779 B1 EP 1287779B1 EP 20020016678 EP20020016678 EP 20020016678 EP 02016678 A EP02016678 A EP 02016678A EP 1287779 B1 EP1287779 B1 EP 1287779B1
Authority
EP
European Patent Office
Prior art keywords
fine
air
water
distribution device
air bubbles
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 - Fee Related
Application number
EP20020016678
Other languages
German (de)
French (fr)
Other versions
EP1287779A2 (en
EP1287779A3 (en
Inventor
Friedrich Mack
Holger Eckert
Jürgen RÖSCH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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
Priority claimed from DE10146443A external-priority patent/DE10146443A1/en
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Publication of EP1287779A2 publication Critical patent/EP1287779A2/en
Publication of EP1287779A3 publication Critical patent/EP1287779A3/en
Application granted granted Critical
Publication of EP1287779B1 publication Critical patent/EP1287779B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4217—Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops

Definitions

  • the invention relates to a device in the water inlet of a household appliance, in particular a dishwasher, with a water return prevention device, and a household appliance with such a device ( DE-A-29 08 824 ).
  • a back suction preventer is disposed in the water inlet, which is also referred to as a backflow preventer or free flow path.
  • the non-return valve prevents any contaminated water from the dishwasher from running back into the piping system of the domestic water connection.
  • the non-return valve has an air vent that communicates with the outside atmosphere. Air bubbles in the water, which flows through the non-return valve, lead to cavitation-like noises or pop noises in the region of the non-return valve from a certain size. Air bubbles in the water occur in particular in hot water connections and lines with a lot of air in the inlet, so that the noise caused by it are subjectively perceived as unpleasant.
  • a water tank for example, is arranged as a heat exchanger
  • the large bubbles cause a louder noise at the back suction preventer and thus exacerbate the noise problem just mentioned.
  • a device is provided in the water inlet of a water-conducting domestic appliance, which has a water return prevention device and a device upstream of the water return prevention device in the flow direction for the fine distribution of air bubbles.
  • a water return prevention device is regularly a device that prevents a return or sucking back of water from the household appliance to the domestic water supply line.
  • the water return prevention device is also referred to as sudsaugverhinderer or free flow path.
  • a device for the fine distribution of air bubbles is a device that comminutes or distributes air bubbles as it flows through the device. Air bubbles above a certain size, which flow through the device are discharged through the device into small and smallest air bubbles in the water flowing through.
  • the fine distribution device has a passage opening whose smallest dimension has only a fraction of the opening width or the opening cross-section of the inflow of the water return prevention device, behind the passage opening initially small air bubbles, their further growth is prevented by the fact that even the small air bubbles of the entrained water to be taken.
  • the smallest opening width of the passage opening is less than 4 mm, or to produce even smaller air bubbles less than 1 mm.
  • the fine distribution device limits only 1/3 to 1/10 of the opening cross section of the water return prevention device.
  • the fine distribution device does not need to limit the entire cross-sectional area in the inflow region of the water return prevention device. It is sufficient if the fine distribution device is arranged in a region of the inflow region, through which the air bubbles preferentially flow past in the incoming water. While maintaining the function of the fine distribution device, the flow resistance in the water inlet of the household appliance is not substantially increased. Particularly large air bubbles within the incoming water rise due to gravity upwards, so that, for example, the arrangement of the fine distribution device is sufficient at an upper edge of an obliquely formed inflow.
  • the fine distribution device is arranged in the inflow region of the water return prevention device, that the water flowing around the fine distribution device is passed past the outlet side of the fine distribution device, whereby the passing small air bubbles are entrained particularly effective.
  • the so-called Venturi effect is exploited, which counteracts the surface tension of the air bubbles when passing through the fine distribution device and sucks the air bubbles through the fine distribution device in front of the fine distribution device.
  • an air retainer By pre-switching an air retainer before the fine distribution device prevents large air bubbles or large amounts of air to rest directly on the fine distribution device and affect their function. From the air retaining device, the air is discharged in small quantities to the fine distribution device during the water supply by the passing water. In the air retainer, large air bubbles accumulate irregularly through the domestic water inlet into the water inlet or air bubbles accumulated from small air bubbles during standstill of the water in a water tank (e.g., heat exchanger) upstream of the water backflow prevention device.
  • a water tank e.g., heat exchanger
  • labyrinthine flow barriers are arranged between the air retention device and the fine distribution device, which are larger due to flow turbulences Distribute air bubbles in smaller air bubbles, before then the smaller air bubbles are further reduced by the fine distribution device.
  • Fig. 1 shows a schematic cross section through a remindsaugverhinderer 1 and an upstream heat exchanger tank 2 in the inlet region of a dishwasher.
  • the non-return valve 1 is an upwardly curved arcuate channel through which the fresh water from a domestic water supply system to the inside of the dishwasher is passed.
  • an air opening 3 is arranged centrally, which decouples the domestic water supply system from the water cycle within the dishwasher in a known manner.
  • the steam-containing atmosphere is guided past a dishwasher inside a dry phase, so that the steam is condensed on the walls of the heat exchanger tank 2 and collected as condensate.
  • the drying phase is shortened for the items stored in the dishwasher interior ware and on the other hand the Fresh water preheated for the next dishwasher cycle.
  • the device according to the invention for the fine distribution of air bubbles does not require the use of a heat exchanger tank 2.
  • An arrangement of the fine distribution device before the remindsaugverhinderer in a supply line with a conventional line cross section is also applicable.
  • the fresh water from the domestic water supply system passes through an inlet 4 in the heat exchanger tank 2, where it is deflected several times by deflecting webs 5, so that a good mixing of the water within the heat exchanger tank 2 results, and then flows into the inflow 6 of the remindsaugverhinderers 1.
  • the water From the remindsaugverhinderer 1, the water enters a channel 7 which supplies the water to a regeneration / dosing unit and a connection channel to the dishwasher interior (not shown).
  • the height of the remindsaugverhinderers 1, the heat exchanger tank 2 and the channel 7 and the elements arranged therein is approximately 1 to 3 cm.
  • an air blast atomizer 10 is arranged in the opening / resp. Inflow region 6 of the remindsaugverhinderers 1, an air blast atomizer 10 is arranged.
  • the air bubble atomizer 10 divides air bubbles 11 of average size above about 1 mm in diameter into small air bubbles 12 having a diameter of less than 1 mm, preferably below 0.5 mm.
  • a web 13 protrudes, which is arranged in the flow path in front of the air bubble atomizer 10.
  • the In the supplied fresh water dissolved or entrained air accumulates within the heat exchanger tank 2 at the top in the air chamber 14. From the volume of water within the heat exchanger tank 2, for example, during the heating of the water volume, air is outgassed from the water, which then collects in the air chamber 14. Or in the incoming fresh water larger air bubbles are included, which are also initially retained in the air chamber 14 when flowing through. During the water flow, the air bubbles 11 of average size are released from the air chamber 14 by the lower edge of the web 13. The air bubble break at the web 13 prevents large gas bubbles from accumulating in front of the air bubble atomizer 10 and thereby impairing its effectiveness.
  • Fig. 2 shows a detailed view of the inflow region 6 of the remindsaugverhinderers 1 adjacent to the heat exchanger tank 2.
  • the air blast atomizer 10 comprises a first web 20 and a second web 21, which are formed extending in the plane and the front side wall of the remindsaugverinder 1 and the heat exchanger tank 2 with the rear Connect sidewall. Between the upper inner wall of the heat exchanger tank 2 and the first web 20, a first gap 22 is formed and between the first and second web 20, 21, a second gap 23 is formed. The cross section of the first and second gap 22, 23 decreases in the flow direction. The smallest gap width is about 0.5 mm.
  • the air bubbles 11 of medium size in front of the air blast atomizer 10 are pressed by the flow accumulation and the flow suction on the outlet side in the gaps 22, 23 and discharged at the outlet side as small air bubbles 12 in the main water flow.
  • the main water flow flows at the exit side of the air blast atomizer 10 over and spatially distributes the bubbles 12.
  • Fig. 3 shows a second embodiment in which instead of in Fig. 1 illustrated, individual web 13 a plurality of upper webs 31 and a plurality of lower webs 32 together form an air bubble labyrinth 30.
  • an air chamber 14 is formed, collect in the larger amounts of air.
  • the deflection of the flow through the air bubble labyrinth 30 a pre-distribution of the air bubbles and comminution of the air bubbles in the air / water flow through the bubble labyrinth is achieved.
  • the size of the air bubbles 11 medium size is further reduced or ensured that no larger air bubbles from the air chamber 14 to the air blast atomizer 10 arrive.

Landscapes

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

Description

Die Erfindung betrifft eine Vorrichtung im Wasserzulauf eines Haushaltsgerätes, insbesondere einer Geschirrspülmaschine, mit einer Wasserrücklaufverhinderungseinrichtung, sowie ein Haushaltsgerät mit einer solchen Vorrichtung ( DE-A-29 08 824 ).The invention relates to a device in the water inlet of a household appliance, in particular a dishwasher, with a water return prevention device, and a household appliance with such a device ( DE-A-29 08 824 ).

Bei einer herkömmlichen Geschirrspülmaschine ist im Wasserzulauf ein Rücksaugverhinderer angeordnet, der auch als Rücklaufverhinderer bzw. freie Fließstrecke bezeichnet wird. Der Rücksaugverhinderer verhindert, daß evtl. verunreinigtes Wasser aus der Geschirrspülmaschine in das Leitungssystem des Hauswasseranschlusses zurückläuft. Der Rücksaugverhinderer hat eine Luftöffnung, die mit der Außenraumatmosphäre in Verbindung steht. Luftblasen im Wasser, das durch den Rücksaugverhinderer strömt, führen im Bereich des Rücksaugverhinderers ab einer bestimmten Größe zu kavitationsähnlichen Geräuschen bzw. Knallgeräuschen. Luftblasen im Wasser treten insbesondere bei Warmwasseranschlüssen und Leitungen mit viel Luft im Zulauf auf, so daß die dadurch verursachten Geräusche subjektiv als unangenehm empfunden werden. Wenn zwischen dem Hauswasseranschluß und dem Rücksaugverhinderer zusätzlich ein Wassertank z.B. als Wärmetauscher angeordnet ist, so können sich in diesem aufgrund der niedrigeren Fließgeschwindigkeiten und während der Standzeit des Wassers kleinere Luftblasen an der oberen Innenseite des Wärmetauschers sammeln und zu größeren Luftblasen verbinden. Die großen Blasen verursachen ein lauteres Geräusch am Rücksaugverhinderer und verschärfen somit das eben genannte Geräuschproblem.In a conventional dishwasher, a back suction preventer is disposed in the water inlet, which is also referred to as a backflow preventer or free flow path. The non-return valve prevents any contaminated water from the dishwasher from running back into the piping system of the domestic water connection. The non-return valve has an air vent that communicates with the outside atmosphere. Air bubbles in the water, which flows through the non-return valve, lead to cavitation-like noises or pop noises in the region of the non-return valve from a certain size. Air bubbles in the water occur in particular in hot water connections and lines with a lot of air in the inlet, so that the noise caused by it are subjectively perceived as unpleasant. If between the domestic water connection and the Rücksaugverhinderer additionally a water tank, for example, is arranged as a heat exchanger, it may be due to the lower flow velocities and during the service life of the water smaller air bubbles in the upper Collect the inside of the heat exchanger and connect to larger air bubbles. The large bubbles cause a louder noise at the back suction preventer and thus exacerbate the noise problem just mentioned.

Es ist daher Aufgabe der Erfindung, eine Vorrichtung im Wasserzulauf eines Haushaltsgerätes mit einer Wasserrücklaufverhinderungseinrichtung vorzusehen, bei der eine Geräuschentwicklung aufgrund von Luftblasen weitgehend reduziert ist.It is therefore an object of the invention to provide a device in the water inlet of a household appliance with a water return prevention device, in which a noise due to air bubbles is largely reduced.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.

Gemäß Anspruch 1 wird eine Vorrichtung im Wasserzulauf eines wasserführenden Haushaltsgerätes vorgesehen, die eine Wasserrücklaufverhinderungseinrichtung und eine der Wasserrücklaufverhinderungseinrichtung in Strömungsrichtung vorgeschaltete Einrichtung zum Feinverteilen von Luftblasen aufweist. Eine Wasserrücklaufverhinderungseinrichtung ist dabei regelmäßig eine Einrichtung, die ein Rücklaufen oder Rücksaugen von Wasser aus dem Haushaltsgerät zur Hauswasseranschlußleitung verhindert. Die Wasserrücklaufverhinderungseinrichtung wird auch als Rücksaugverhinderer oder freie Fließstrecke bezeichnet. Eine Einrichtung zum Feinverteilen von Luftblasen ist dabei eine Einrichtung, die Luftblasen beim Durchströmen der Einrichtung zerkleinert bzw. verteilt. Luftblasen oberhalb einer bestimmten Größe, die durch die Einrichtung strömen, werden durch die Einrichtung zerteilt in kleine und kleinste Luftblasen in das durchströmende Wasser abgegeben. Dadurch findet auch eine räumliche Verteilung der Luftblasen statt, so daß die Wahrscheinlichkeit reduziert ist, daß sich die Luftblasen beim Durchströmen der Wasserrücklaufverhinderungseinrichtung wieder vereinigen und so als große Luftblasen zur Geräuschentwicklung beitragen. Die oben genannten kavitationsähnlichen Geräusche treten bei kleinen Luftblasen nur mit erheblich verminderter Stärke bzw. gar nicht auf. Damit ist der Geräuschpegel des Haushaltsgerätes während des Frischwasserzulaufs erheblich reduziert.According to claim 1, a device is provided in the water inlet of a water-conducting domestic appliance, which has a water return prevention device and a device upstream of the water return prevention device in the flow direction for the fine distribution of air bubbles. A water return prevention device is regularly a device that prevents a return or sucking back of water from the household appliance to the domestic water supply line. The water return prevention device is also referred to as Rücksaugverhinderer or free flow path. A device for the fine distribution of air bubbles is a device that comminutes or distributes air bubbles as it flows through the device. Air bubbles above a certain size, which flow through the device are discharged through the device into small and smallest air bubbles in the water flowing through. As a result, there is also a spatial distribution of the air bubbles, so that the probability is reduced that the air bubbles in the Re-flow through the water return prevention device and thus contribute as a large air bubbles to noise. The above-mentioned cavitation-like noises occur with small air bubbles only with significantly reduced strength or not at all. Thus, the noise level of the household appliance during the fresh water intake is significantly reduced.

Dadurch, daß die Feinverteilungseinrichtung eine Durchtrittsöffnung aufweist, deren kleinste Abmessung lediglich einen Bruchteil der Öffnungsweite bzw. des Öffnungsquerschnittes des Einströmbereichs der Wasserrücklaufverhinderungseinrichtung aufweist, bilden sich hinter der Durchtrittsöffnung zunächst kleine Luftblasen, deren weiteres Anwachsen dadurch verhindert wird, daß bereits die kleinen Luftblasen von dem mitströmenden Wasser mitgenommen werden. Vorzugsweise ist die kleinste Öffnungsweite der Durchtrittsöffnung kleiner 4 mm, oder zur Erzeugung noch kleinerer Luftblasen kleiner 1 mm. Vorzugsweise begrenzt die Feinverteilungsvorrichtung nur 1/3 bis 1/10 des Öffnungsquerschnitts der Wasserrücklaufverhinderungseinrichtung.The fact that the fine distribution device has a passage opening whose smallest dimension has only a fraction of the opening width or the opening cross-section of the inflow of the water return prevention device, behind the passage opening initially small air bubbles, their further growth is prevented by the fact that even the small air bubbles of the entrained water to be taken. Preferably, the smallest opening width of the passage opening is less than 4 mm, or to produce even smaller air bubbles less than 1 mm. Preferably, the fine distribution device limits only 1/3 to 1/10 of the opening cross section of the water return prevention device.

Die Feinverteilungseinrichtung braucht dabei nicht die gesamte Querschnittsfläche im Einströmbereich der Wasserrücklaufverhinderungseinrichtung zu begrenzen. Es genügt, wenn die Feinverteilungseinrichtung in einem Bereich des Einströmbereichs angeordnet ist, durch den bevorzugt die Luftblasen im zulaufenden Wasser konzentriert vorbeiströmen. Unter Wahrung der Funktion der Feinverteilungseinrichtung wird der Strömungswiderstand im Wasserzulauf des Haushaltsgerätes nicht wesentlich erhöht. Besonders große Luftblasen innerhalb des zulaufenden Wassers steigen aufgrund der Schwerkraft nach oben, so daß z.B. die Anordnung der Feinverteilungseinrichtung an einer Oberkante eines schräg ausgebildeten Einströmbereichs ausreichend ist.The fine distribution device does not need to limit the entire cross-sectional area in the inflow region of the water return prevention device. It is sufficient if the fine distribution device is arranged in a region of the inflow region, through which the air bubbles preferentially flow past in the incoming water. While maintaining the function of the fine distribution device, the flow resistance in the water inlet of the household appliance is not substantially increased. Particularly large air bubbles within the incoming water rise due to gravity upwards, so that, for example, the arrangement of the fine distribution device is sufficient at an upper edge of an obliquely formed inflow.

Ganz besonders vorteilhaft wird die Feinverteilungseinrichtung derart im Einströmbereich der Wasserrücklaufverhinderungseinrichtung angeordnet, daß das Wasser, das die Feinverteilungseinrichtung umströmt, an der Austrittsseite der Feinverteilungseinrichtung vorbei geleitet wird, wodurch die durchtretenden, kleinen Luftblasen besonderes effektiv mitgerissen werden. Vorteilhaft wird dabei der sogenannte Venturi-Effekt ausgenutzt, der der Oberflächenspannung der Luftblasen beim Durchtritt durch die Feinverteilungseinrichtung entgegenwirkt und die Luftblasen vor der Feinverteilungseinrichtung durch die Feinverteilungseinrichtung hindurchsaugt.Most preferably, the fine distribution device is arranged in the inflow region of the water return prevention device, that the water flowing around the fine distribution device is passed past the outlet side of the fine distribution device, whereby the passing small air bubbles are entrained particularly effective. Advantageously, the so-called Venturi effect is exploited, which counteracts the surface tension of the air bubbles when passing through the fine distribution device and sucks the air bubbles through the fine distribution device in front of the fine distribution device.

Durch das Vorschalten einer Luftrückhalteeinrichtung vor die Feinverteilungseinrichtung wird verhindert, daß große Luftblasen bzw. große Luftmengen direkt an der Feinverteilungseinrichtung anliegen und deren Funktion beeinträchtigen. Von der Luftrückhalteeinrichtung wird während des Wasserzulaufs durch das vorbeiströmende Wasser die Luft in kleinen Mengen an die Feinverteilungseinrichtung abgegeben. In der Luftrückhalteeinrichtung sammeln sich große Luftblasen, die unregelmäßig durch den Hauswasseranschluß in den Wasserzulauf gelangen oder Luftblasen, die sich aus kleinen Luftblasen während des Stillstands des Wassers in einem der Wasserrücklaufverhinderungseinrichtung vorgeschalteten Wassertank (z.B. Wärmetauscher) angesammelt haben.By pre-switching an air retainer before the fine distribution device prevents large air bubbles or large amounts of air to rest directly on the fine distribution device and affect their function. From the air retaining device, the air is discharged in small quantities to the fine distribution device during the water supply by the passing water. In the air retainer, large air bubbles accumulate irregularly through the domestic water inlet into the water inlet or air bubbles accumulated from small air bubbles during standstill of the water in a water tank (e.g., heat exchanger) upstream of the water backflow prevention device.

Vorteilhaft sind zwischen der Luftrückhalteeinrichtung und der Feinverteilungseinrichtung labyrinthartige Strömungsbarrieren angeordnet, die durch Strömungsturbulenzen größere Luftblasen in kleinere Luftblasen verteilen, bevor dann die kleineren Luftblasen durch die Feinverteilungseinrichtung noch weiter zerkleinert werden.Advantageously, labyrinthine flow barriers are arranged between the air retention device and the fine distribution device, which are larger due to flow turbulences Distribute air bubbles in smaller air bubbles, before then the smaller air bubbles are further reduced by the fine distribution device.

Anhand von Figuren werden Ausführungsformen der Erfindung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Querschnitt durch einen Rücksaugverhinderer, der oberhalb eines Wärmetauscherbehälters angeordnet ist,
Fig. 2
eine Detailansicht von Fig. 1 mit einer Luftblasenbarriere und
Fig. 3
einen Luftblasenzerstäuber mit einem vorgeschalteten Luftblasenlabyrinth.
With reference to figures embodiments of the invention will be explained in more detail. Show it:
Fig. 1
a schematic cross section through a non-return valve, which is arranged above a heat exchanger tank,
Fig. 2
a detailed view of Fig. 1 with an air bubble barrier and
Fig. 3
an air bubble sprayer with an upstream bubble labyrinth.

Fig. 1 zeigt einen schematischen Querschnitt durch einen Rücksaugverhinderer 1 und einen vorgeschalteten Wärmetauscherbehälter 2 im Zulaufbereich einer Geschirrspülmaschine. Der Rücksaugverhinderer 1 ist ein nach oben gewölbter bogenförmiger Kanal, durch den das Frischwasser aus einem Hauswasserversorgungssystem zum Inneren der Geschirrspülmaschine geleitet wird. An der unteren Bogenwand ist mittig eine Luftöffnung 3 angeordnet, die auf bekannte Weise das Hauswasserleitungssystem vom Wasserkreislauf innerhalb der Geschirrspülmaschine entkoppelt. Am Wärmetauscherbehälter 2 wird während einer Trockenphase die dampfhaltige Atmosphäre aus einem Geschirrspülmaschineninnenraum vorbeigeleitet, so daß der Dampf an den Wänden des Wärmetauscherbehälters 2 kondensiert und als Kondensat aufgefangen wird. Dadurch wird einerseits die Trockenphase für das im Spülmaschineninnenraum lagernde Spülgut verkürzt und andererseits das Frischwasser für den nächsten Spülmaschinendurchlauf vorgewärmt. Die erfindungsgemäße Vorrichtung zur Feinverteilung von Luftblasen setzt jedoch nicht die Verwendung eines Wärmetauscherbehälters 2 voraus. Eine Anordnung der Feinverteilungseinrichtung vor dem Rücksaugverhinderer in einer Zuleitung mit herkömmlichem Leitungsquerschnitt ist ebenso einsetzbar. Fig. 1 shows a schematic cross section through a Rücksaugverhinderer 1 and an upstream heat exchanger tank 2 in the inlet region of a dishwasher. The non-return valve 1 is an upwardly curved arcuate channel through which the fresh water from a domestic water supply system to the inside of the dishwasher is passed. On the lower arch wall, an air opening 3 is arranged centrally, which decouples the domestic water supply system from the water cycle within the dishwasher in a known manner. At the heat exchanger tank 2, the steam-containing atmosphere is guided past a dishwasher inside a dry phase, so that the steam is condensed on the walls of the heat exchanger tank 2 and collected as condensate. As a result, on the one hand the drying phase is shortened for the items stored in the dishwasher interior ware and on the other hand the Fresh water preheated for the next dishwasher cycle. However, the device according to the invention for the fine distribution of air bubbles does not require the use of a heat exchanger tank 2. An arrangement of the fine distribution device before the Rücksaugverhinderer in a supply line with a conventional line cross section is also applicable.

Das Frischwasser vom Hauswasserversorgungssystem tritt durch einen Zulauf 4 in den Wärmetauscherbehälter 2, wird dort durch Umlenkstege 5 mehrfach umgelenkt, so daß sich eine gute Durchmischung des Wassers innerhalb des Wärmetauscherbehälters 2 ergibt, und mündet dann in den Einströmbereich 6 des Rücksaugverhinderers 1. Aus dem Rücksaugverhinderer 1 tritt das Wasser in einen Kanal 7, der das Wasser einer Regenerier-/Dosiereinheit und einem Verbindungskanal zum Spülmaschinen-innenraum zuführt (nicht dargestellt). Die Bauhöhe des Rücksaugverhinderers 1, des Wärmetauscherbehälters 2 und des Kanals 7 und der darin angeordneten Elemente beträgt ungefähr 1 bis 3 cm.The fresh water from the domestic water supply system passes through an inlet 4 in the heat exchanger tank 2, where it is deflected several times by deflecting webs 5, so that a good mixing of the water within the heat exchanger tank 2 results, and then flows into the inflow 6 of the Rücksaugverhinderers 1. From the Rücksaugverhinderer 1, the water enters a channel 7 which supplies the water to a regeneration / dosing unit and a connection channel to the dishwasher interior (not shown). The height of the Rücksaugverhinderers 1, the heat exchanger tank 2 and the channel 7 and the elements arranged therein is approximately 1 to 3 cm.

Im Öffnungs-/bzw. Einströmbereich 6 des Rücksaugverhinderers 1 ist ein Luftblasenzerstäuber 10 angeordnet. Der Luftblasenzerstäuber 10 zerteilt Luftblasen 11 mittlerer Größe oberhalb ungefähr 1 mm Durchmesser in kleine Luftblasen 12 mit einem Durchmesser kleiner 1 mm, vorzugsweise unterhalb 0,5 mm. Von der oberen Innenwand des Wärmetauscherbehälters 2 steht ein Steg 13 hervor, der im Strömungsweg vor dem Luftblasenzerstäuber 10 angeordnet ist. Durch den nach unten hervorstehenden Steg 13 und den schräg nach oben gerichteten Verlauf der oberen Innenwand des Wärmetauscherbehälters 2 in Richtung Öffnungsbereich 6 des Rücksaugverhinderers 1 wird eine Luftsammelkammer 14 ausgebildet. Die im zugeführten Frischwasser gelöste oder mitgerissene Luft sammelt sich innerhalb des Wärmetauscherbehälters 2 an dessen Oberseite in der Luftkammer 14. Aus dem Wasservolumen innerhalb des Wärmetauscherbehälters 2 wird beispielsweise während der Erwärmung des Wasservolumens Luft aus dem Wasser ausgegast, welches sich dann in der Luftkammer 14 sammelt. Oder im zuströmenden Frischwasser sind größere Luftblasen enthalten, die beim Durchströmen ebenfalls zunächst in der Luftkammer 14 zurückgehalten werden. Während der Wasserströmung lösen sich von der Unterkante des Steges 13 die Luftblasen 11 mittlerer Größe aus der Luftkammer 14. Durch den Luftblasenabriss am Steg 13 wird verhindert, daß sich große Gasblasen vor dem Luftblasenzerstäuber 10 ansammeln und dadurch dessen Wirksamkeit beeinträchtigen.In the opening / resp. Inflow region 6 of the Rücksaugverhinderers 1, an air blast atomizer 10 is arranged. The air bubble atomizer 10 divides air bubbles 11 of average size above about 1 mm in diameter into small air bubbles 12 having a diameter of less than 1 mm, preferably below 0.5 mm. From the upper inner wall of the heat exchanger tank 2, a web 13 protrudes, which is arranged in the flow path in front of the air bubble atomizer 10. By the downwardly projecting web 13 and the obliquely upward course of the upper inner wall of the heat exchanger tank 2 in the direction of the opening portion 6 of the Rücksaugverhinderers 1, an air collecting chamber 14 is formed. The In the supplied fresh water dissolved or entrained air accumulates within the heat exchanger tank 2 at the top in the air chamber 14. From the volume of water within the heat exchanger tank 2, for example, during the heating of the water volume, air is outgassed from the water, which then collects in the air chamber 14. Or in the incoming fresh water larger air bubbles are included, which are also initially retained in the air chamber 14 when flowing through. During the water flow, the air bubbles 11 of average size are released from the air chamber 14 by the lower edge of the web 13. The air bubble break at the web 13 prevents large gas bubbles from accumulating in front of the air bubble atomizer 10 and thereby impairing its effectiveness.

Fig. 2 zeigt eine Detailansicht des Einströmbereichs 6 des Rücksaugverhinderers 1 angrenzend an den Wärmetauscherbehälter 2. Der Luftblasenzerstäuber 10 umfaßt einen ersten Steg 20 und einen zweiten Steg 21, die in Zeichenebene verlaufend ausgebildet sind und die vordere Seitenwand des Rücksaugverhinderers 1 bzw. des Wärmetauscherbehälters 2 mit der hinteren Seitenwand verbinden. Zwischen der oberen Innenwand des Wärmetauscherbehälters 2 und dem ersten Steg 20 ist ein erster Spalt 22 ausgebildet und zwischen dem ersten und zweiten Steg 20, 21 ist ein zweiter Spalt 23 ausgebildet. Der Querschnitt des ersten und zweiten Spalts 22, 23 nimmt in Strömungsrichtung ab. Die kleinste Spaltbreite beträgt ungefähr 0,5 mm. Die Luftblasen 11 mittlerer Größe vor dem Luftblasenzerstäuber 10 werden durch den Strömungsstau und den Strömungssog auf der Auslaßseite in die Spalte 22, 23 gedrückt und an der Austrittsseite als Luftblasen 12 kleiner Größe in die Hauptwasserströmung abgegeben. Die Hauptwasserströmung fließt an der Austrittsseite des Luftblasenzerstäubers 10 vorbei und verteilt die Luftblasen 12 räumlich. Fig. 2 shows a detailed view of the inflow region 6 of the Rücksaugverhinderers 1 adjacent to the heat exchanger tank 2. The air blast atomizer 10 comprises a first web 20 and a second web 21, which are formed extending in the plane and the front side wall of the Rücksaugverinder 1 and the heat exchanger tank 2 with the rear Connect sidewall. Between the upper inner wall of the heat exchanger tank 2 and the first web 20, a first gap 22 is formed and between the first and second web 20, 21, a second gap 23 is formed. The cross section of the first and second gap 22, 23 decreases in the flow direction. The smallest gap width is about 0.5 mm. The air bubbles 11 of medium size in front of the air blast atomizer 10 are pressed by the flow accumulation and the flow suction on the outlet side in the gaps 22, 23 and discharged at the outlet side as small air bubbles 12 in the main water flow. The main water flow flows at the exit side of the air blast atomizer 10 over and spatially distributes the bubbles 12.

Fig. 3 zeigt eine zweite Ausführungsform bei der anstelle des in Fig. 1 dargestellten, einzelnen Stegs 13 mehrere obere Stege 31 und mehrere untere Stege 32 zusammen ein Luftblasenlabyrinth 30 ausbilden. Wie in Fig. 1 dargestellt wird vor dem rechts dargestellten, oberen Steg 31 eine Luftkammer 14 ausgebildet, in der sich größere Luftmengen sammeln. Durch die Umlenkung der Strömung durch das Luftblasenlabyrinth 30 wird eine Vorverteilung der Luftblasen und Zerkleinerung der Luftblasen in der Luft/Wasserströmung durch das Luftblasenlabyrinth erreicht. Damit wird die Größe der Luftblasen 11 mittlerer Größe noch weiter reduziert bzw. sichergestellt, daß keine größeren Luftblasen aus der Lüftkammer 14 zum Luftblasenzerstäuber 10 gelangen. Fig. 3 shows a second embodiment in which instead of in Fig. 1 illustrated, individual web 13 a plurality of upper webs 31 and a plurality of lower webs 32 together form an air bubble labyrinth 30. As in Fig. 1 is shown in front of the right illustrated, upper web 31, an air chamber 14 is formed, collect in the larger amounts of air. By the deflection of the flow through the air bubble labyrinth 30, a pre-distribution of the air bubbles and comminution of the air bubbles in the air / water flow through the bubble labyrinth is achieved. Thus, the size of the air bubbles 11 medium size is further reduced or ensured that no larger air bubbles from the air chamber 14 to the air blast atomizer 10 arrive.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1:1:
RücksaugverhindererRücksaugverhinderer
2:2:
WärmetauscherbehälterHeat exchanger tank
3:3:
Luftöffnungair opening
4:4:
ZulaufIntake
5:5:
Umlenkstegdeflection web
6:6:
Einströmbereichinflow
7:7:
Kanalchannel
10:10:
Zerstäuberatomizer
11:11:
Luftblase (mittlerer Durchmesser)Air bubble (medium diameter)
12:12:
Luftblase (kleiner Durchmesser)Air bubble (small diameter)
13:13:
Stegweb
14:14:
Luftkammerair chamber
20:20:
erster Stegfirst jetty
21:21:
zweiter Stegsecond bridge
22:22:
erster Spaltfirst gap
23:23:
zweiter Spaltsecond gap
30:30:
Labyrinthlabyrinth
31:31:
oberer Stegupper jetty
32:32:
unterer Steglower jetty

Claims (11)

  1. Device in the water supply of a domestic appliance, in particular of a dishwasher, having a return flow prevention device (1), characterised by a device (10) arranged upstream of the return flow prevention device (1) for fine distribution of air bubbles.
  2. Device according to claim 1, characterised in that the fine-distribution device (10) is arranged directly in the inflow region (6) of the return flow prevention device (1).
  3. Device according to claim 1 or 2, characterised in that in the fine-distribution device (10), at least one passage opening (22, 23) is formed, the opening width of which in at least one direction is only a fraction of the opening width of the inflow region (6) of the return flow prevention device (1).
  4. Device according to claim 1, 2 or 3, characterised in that the at least one opening width of the at least one passage opening (22, 23) is less than 4 mm, preferably less than 1 mm.
  5. Device according to one of the preceding claims, characterised in that the fine-distribution device (10) only partly restricts the cross-section of the inflow region (6), wherein the fine-distribution device (10) is arranged in the preferred flow region of air bubbles (11).
  6. Device according to claim 5, characterised in that the cross-section restriction is formed such that the greatest part of the quantity of water flow flows past the fine-distribution device (10) to the return flow prevention device (1), wherein the proportion is in particular more than 50% of the quantity of water flow.
  7. Device according to one of the preceding claims, characterised in that the outlet side of the fine-distribution device (10) adjoins the water flow passage, through which the quantity of water flow flowing past the fine-distribution device (10) flows to the return flow prevention device (1).
  8. Device according to one of the preceding claims, characterised in that the at least one passage opening (22, 23) has a cross-section which decreases in flow direction and/or at least one passage opening (22, 23) is formed like a slit.
  9. Device according to one of the preceding claims, characterised in that the fine-distribution device (10) has passage openings arranged like a sieve.
  10. Device according to one of the preceding claims, characterised in that an air-retaining device (14) is arranged upstream of the fine-distribution device (10) and/or the air-retaining device (14) has a separating bar (13) and/or a flow labyrinth (30) is arranged between the air-retaining device (14) and the fine-distribution device (10).
  11. Domestic appliance, in particular dishwasher, having a device according to one of the preceding claims in the water supply.
EP20020016678 2001-09-03 2002-07-26 Device in the water inlet of a household appliance Expired - Fee Related EP1287779B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10142885 2001-09-03
DE10142885 2001-09-03
DE10146443A DE10146443A1 (en) 2001-09-03 2001-09-20 Device in the water inlet of a household appliance
DE10146443 2001-09-20

Publications (3)

Publication Number Publication Date
EP1287779A2 EP1287779A2 (en) 2003-03-05
EP1287779A3 EP1287779A3 (en) 2006-10-18
EP1287779B1 true EP1287779B1 (en) 2009-09-09

Family

ID=26010051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020016678 Expired - Fee Related EP1287779B1 (en) 2001-09-03 2002-07-26 Device in the water inlet of a household appliance

Country Status (1)

Country Link
EP (1) EP1287779B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9445705B2 (en) 2011-09-22 2016-09-20 Electrolux Home Products, Inc. Fluid inlet for controlled filling of a dishwasher

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717168A (en) * 1971-05-12 1973-02-20 Design & Mfg Corp Water inlet unit for appliances
DE2908824A1 (en) * 1979-03-07 1980-09-18 Miele & Cie Backflow preventer for plumbed-in washing appliances - having centrifugal water flow around curved open surface between tangential jets
GB2155316B (en) * 1984-03-13 1988-06-15 Balay Sa Hydraulic feeder having a steam outlet for dishwashers

Also Published As

Publication number Publication date
EP1287779A2 (en) 2003-03-05
EP1287779A3 (en) 2006-10-18

Similar Documents

Publication Publication Date Title
EP0143944B1 (en) Device for cooling and granulating extruded thermoplastic synthetic resin
DE3317230C2 (en)
DE19505213C1 (en) Air supply device for vehicle
DE3330951A1 (en) FRESH AIR SUPPLY DEVICE FOR A HEATING VENTILATION AND / OR AIR CONDITIONING DEVICE
DE10122531A1 (en) Quenching tower, used for quenching coke, comprises quenching chamber, shaft into which vapor produced by quenching coke rises, removal devices in shaft in rising direction of vapor, and scrubbing devices
DE3213641A1 (en) DUST FILTER DEVICE
DE1729443C3 (en) Device for drying material fed in the form of a belt
DE2526912A1 (en) DEVICE FOR CLEANING A GAS FLOW
DE10351641B3 (en) Fresh air feeding unit for the cabin of a vehicle comprises a wash plate having a passage region impinged with a secondary air stream and forming a grid-like flat region of the wash plate
DE102009044117B4 (en) Separator system for separating drops from a flue gas flow
DE2348269C2 (en) Gas dedusting device
EP1287779B1 (en) Device in the water inlet of a household appliance
DE2509630A1 (en) FILTER SUMP ARRANGEMENT FOR AN EVAPORATIVE HEAT EXCHANGER
EP0058398A2 (en) Apparatus for dewatering and drying solid material, especially for synthetic material granulated under water
DE3623185C2 (en)
DE4112983A1 (en) Biological filter for washing exhaust air from cattle sheds - where water flows downwards through media in tower in which air is drawn upwards by a fan
DE3244168C2 (en) Steam distributor, in particular for humidification systems
DE2045082B2 (en) SPRAY BODY FOR HUMIDIFIER
DE4041196C1 (en)
EP2677242A1 (en) Device for bleeding off air
DE19923195C1 (en) Air intake appliance has bypass chamber connected to air-water, air, water ducts, with grid spaced apart from base
DE10146443A1 (en) Device in the water inlet of a household appliance
DE2629581A1 (en) METHOD AND DEVICE FOR DECONTAMINATING A LIQUID LOADED WITH POLLUTANTS
DE102008008401B4 (en) Device for separating solid or liquid substances from a gas stream
DE4424383C2 (en) Harvester screen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17P Request for examination filed

Effective date: 20061006

AKX Designation fees paid

Designated state(s): DE ES FR GB IT

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 50213830

Country of ref document: DE

Date of ref document: 20091022

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20091220

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20100610

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090909

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110201

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50213830

Country of ref document: DE

Effective date: 20110201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100802

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100726