EP2192852B1 - Dishwasher - Google Patents

Dishwasher Download PDF

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Publication number
EP2192852B1
EP2192852B1 EP08785206A EP08785206A EP2192852B1 EP 2192852 B1 EP2192852 B1 EP 2192852B1 EP 08785206 A EP08785206 A EP 08785206A EP 08785206 A EP08785206 A EP 08785206A EP 2192852 B1 EP2192852 B1 EP 2192852B1
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EP
European Patent Office
Prior art keywords
dishwasher
nozzle
recited
flow obstacle
spray
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.)
Active
Application number
EP08785206A
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German (de)
French (fr)
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EP2192852A1 (en
Inventor
Seyfettin Kara
Martin Kornberger
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Miele und Cie KG
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Miele und Cie KG
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Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Priority to PL08785206T priority Critical patent/PL2192852T3/en
Publication of EP2192852A1 publication Critical patent/EP2192852A1/en
Application granted granted Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/14—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/18—Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with movably-mounted spraying devices
    • A47L15/22—Rotary spraying devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4278—Nozzles
    • A47L15/4282—Arrangements to change or modify spray pattern or direction
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4289—Spray-pressure measuring or regulating arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/28—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3415—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with swirl imparting inserts upstream of the swirl chamber

Definitions

  • the present invention relates to a dishwasher according to the preamble of claim 1.
  • a dishwashing machine with pulsating nozzles wherein an arm has a plurality of nozzles which are supplied with each other via different channels.
  • a channel is in connection with so-called auxiliary nozzles, wherein the supply of rinsing liquid to these auxiliary nozzles can be shut off via a valve. This ensures that the rinsing liquid exits pulsating and partially the spraying of rinsing liquid is avoided from the auxiliary nozzles.
  • a dishwashing machine with a spray arm is known in which individual spray nozzles can be activated or deactivated without the use of additional actuators. Depending on the change in the pump pressure, a pulsation of the spraying of the dishes can be achieved in order to allow effective cleaning.
  • elastic means are provided which can open and close the individual nozzles.
  • the spray jet in the prior art nozzles always exits according to the nozzle opening. It is not intended that the spray jets be changed in geometry and therefore may not enter well in problem areas such as pots, sink corners or other hard to reach areas. Because despite the possibility of a pulsating operation, the geometry of the exiting spray jet remains predetermined.
  • At least one spray arm is used, in which a rotating element generates pulsating sprays inside.
  • a spray arm with spray nozzles is known whose spray jet characteristic can be changed via diaphragm-shaped actuating elements. For this purpose, a manual intervention of the user is required.
  • the present invention poses the problem of providing a dishwasher in which the flushing liquid emerging in the spray jet can be at least partially adapted from simply constructed spray arms.
  • a flow obstacle for changing the geometry of the spray jet is provided within the spray arm in front of at least one nozzle. It has been found that by a flow obstruction adjacent to the nozzle but within the spray arm, the geometry of the exiting spray jet can be changed so that it not only straight out of the spray arm, but also has other geometries, which increases the effectiveness of the cleaning performance. Because, in particular, by changing the geometry of the spray can also poorly accessible areas, as well as in pots or corners reach.
  • the spray arm is designed as a hollow body and a flow obstacle is held on the opposite to the nozzle inner wall of the hollow body.
  • defined flow channels are formed within the spray arm, so that the exiting fluid generates a spray jet in accordance with the design of the flow obstacle and the nozzle.
  • the flow obstacle may protrude to just before the exit surface of the spray jet at the nozzle, for example in a range of less than 4 mm.
  • the flow obstacle is movable relative to the adjacent nozzle.
  • a plurality of nozzles are provided distributed over the spray arm, each associated with a flow obstacle.
  • a suitable flow obstruction of the nozzle can be assigned depending on the seat of the nozzle.
  • flow obstacles are advantageous, which produce a somewhat wider spray jet, while radially inner nozzles on the spray arm can produce a narrower, more powerful jet.
  • the flow obstacle may preferably be formed as a pin with a rounded surface, so that there is a conical spray. It is also possible to form the flow obstruction as a V-shaped ramp, as a helix, or as a pin to produce a particular spray.
  • a spray arm 1 is arranged in a washing compartment of a dishwasher, not shown in more detail. It is designed as a hollow body 2 and provided centrally at a central opening with a connection 3 for connection to a pipe system of the dishwasher. Thus, rinsing fluid can be pumped into the spray arm 1 via a pump, also not shown.
  • the connection 3 is arranged on a central axis of rotation A of the spray arm 1.
  • nozzles 5 On the hollow body 2 a plurality of nozzles 5 are formed in a first wall 4, can be sprayed via the rinsing liquid not shown in detail ware. Furthermore, one or more drive nozzles 6 can be provided, which ensure a rotation of the spray arm 1 during the rinsing operation.
  • the nozzles 5 may be directed upward as shown in the figures. Alternatively, downward orientation is also conceivable in order to clean dishes under the spray arm.
  • flow obstacles 8 are arranged in the hollow body 2, which extend from the opposite wall 7 of the hollow body 2 in the direction of the nozzles 5.
  • Each flow obstacle 8 is associated with a nozzle 5.
  • FIG. 2A a nozzle 5 of a spray arm is shown, as used in the prior art.
  • the nozzle 5 is directed upwards and has an exit surface 9, through which the rinsing liquid emerges in a punctiform jet 10. Due to the volume flow, the jet 10 can be varied in intensity in flushing liquid, but not in the geometry. The ray shape thus remains the same.
  • the spray arm 1 according to the invention is shown with the flow obstacle 8, which is designed as a pin and has a rounded surface, preferably as a hemisphere, which is arranged adjacent to the nozzle 5.
  • the flow obstacle 8 is arranged directly adjacent to the nozzle 5 in front of the circular exit surface 9, so that the flow of the rinsing liquid is influenced on the way into the nozzle 5.
  • the shape of a jet 11 is changed out of the nozzle 5, so that due to the peg-shaped flow obstacle 8, the jet emerges from the outlet surface 9 in a cone shape.
  • This jet shape can cover a larger area, which is supplied with rinsing liquid.
  • a modified flow obstruction 18 is arranged in the spray arm 1, which is designed as a thin pin which projects through the nozzle 5.
  • a tip 19 is arranged outside the exit surface 9 of the nozzle 5.
  • a spray jet 20 is formed, which is designed as a hollow cone. Due to the cone-shaped spreading of the jet, on the one hand a relatively large spray area is covered and on the other hand the volume flow in the area of the outer surface of the hollow cone jet 20 is greater than in the case of a full cone jet 11.
  • a ramp which extends in a wall shape and adjacent to the nozzle 5 is V-shaped, so that directed to the nozzle 5 slopes 29 form.
  • the spray jet 30 emerging from the exit surface 9 is formed as a flat jet, widening wedge-shaped.
  • FIG. 2E another embodiment of a flow obstacle 38 is shown, which is provided as a helix with a helical channel 39. This helix ends shortly before the exit surface 9 of the nozzle 5, so that the outgoing jet 40 is formed as a vortex jet.
  • the flow obstacle 8, 18, 28 and 38 forms a kind of throttle for the nozzle 5, so that due to the predetermined flow conditions adjacent to the nozzle 5, a certain geometry of spray jet 11, 20, 30 or 40 is generated, which may also depend on Volume flow is.
  • a certain geometry of spray jet 11, 20, 30 or 40 is generated, which may also depend on Volume flow is.
  • a spray arm 1 which, in turn, is designed as a hollow body 2 with a central connection 3, the connection 3 running along a central axis of rotation A is arranged.
  • the hollow body 2 has in its upper wall 4 nozzles 5 and also one or more drive nozzles 6.
  • nozzles 5 extends within the hollow body 2, starting from the opposite wall 7 each have a flow obstacle 8 'in the direction of a nozzle which is adjustable on the bottom 7 of the Low spray 2 is held.
  • the flow obstacle 8 ' is designed as a pin with a rounded surface, wherein on the pin 8' an external thread 9 'is formed, which is in engagement with a thread (not shown) on the wall 7.
  • the flow obstacle can be moved closer to the nozzle 5 or away from the nozzle 5 by turning the pin 8 '.
  • FIG. 4A the pin 8 'is moved away from the nozzle 5 via a tool, not shown, which is in engagement with a slot 10', so that the influencing of the flow path of the rinsing liquid is reduced and insofar the geometry of the jet emerging from the nozzle 5 is changed ,
  • the hemispherical surface is arranged immediately adjacent to the nozzle 5, so that the flow path of the rinsing liquid to the nozzle 5 is relatively strongly influenced, so that the outgoing jet has a fanned-out geometry than in the case of FIG shown position.
  • the user can adjust the geometry of the spray jet by manually screwing or unscrewing the pins 8 'on the spray arm 1'.
  • FIG. 3 Flow obstacles are shown in the form of pin 8 ', wherein it is of course also possible in the FIGS. 2C to E shown flow obstacles 18, 28 or 38 as needed to provide the individual nozzles 5.
  • FIG. 5 a further embodiment of a spray arm 1 according to the invention is shown, which is designed as a hollow body 2 and has a connection 3 around a central axis of rotation 4.
  • the hollow body 2 has distributed over the length of a plurality of nozzles 5, wherein drive nozzles 6 are provided as a rotary drive.
  • Adjacent to the nozzles 5 are provided as flow obstacles pins 8 "with a rounded surface, but these are not fixedly arranged on the nozzle 5 opposite wall 7 of the hollow body 2, but via a spring element 9" movable. Thereby, the distance of the flow obstacle 8 "to the nozzle 5 is dependent on the pressure within the spray arm 1, so that at increased pump speed, the flow obstacles 8" further pushed away from the nozzle 5 than at low pump speed. As a result, the spray jet is varied from the nozzles 5 depending on the pressure within the spray arm 1.
  • FIG. 6A is the storage of in FIG. 5
  • the pin 8 is mounted on a helical spring 9", preferably made of steel, the spring 9 "being supported on a receptacle 10" on the wall 7 of the spray arm 1 ".
  • FIG. 6B it is also possible to provide on the wall 7 of the spray arm 1, a membrane 9 "', on which then a flow obstacle 8'" is movably mounted in the form of a pin.
  • the flow obstacles 8 are either fixedly mounted on the bottom 7, adjustable on the bottom 7 or resiliently on the bottom 7. It is of course also possible to provide different flow obstacles 8 on a spray arm, which are partially fixed, partially adjustable and partially spring-mounted.
  • the geometry of the flow obstacles may differ within a spray arm, so that different geometries of spray jets at the individual nozzles 5 can be generated. In this case, instead of a circular exit surface on the nozzle 5, a slot hole or another geometry may be provided.

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  • Washing And Drying Of Tableware (AREA)

Abstract

A dishwasher includes a washing chamber and at least one spray arm rotatably mounted in the washing chamber. The at least one spray arm is provided with a plurality of nozzles, each configured to spray wash water in a respective spray jet. The plurality of nozzles are supplied with wash water by a pump. A flow obstacle is disposed in the spray arm upstream of a first nozzle of the plurality of nozzles and configured to change a geometry of the respective spray jet.

Description

Die vorliegende Erfindung betrifft einen Geschirrspüler nach dem Oberbegriff des Anspruches 1.The present invention relates to a dishwasher according to the preamble of claim 1.

Aus der EP 1 040 786 A1 ist eine Geschirrspülmaschine mit pulsierenden Düsen bekannt, wobei ein Arm mehrere Düsen aufweist, die über unterschiedliche Kanäle miteinander versorgt werden. Ein Kanal steht in Verbindung mit sogenannten Hilfsdüsen, wobei die Zuführung von Spülflüssigkeit zu diesen Hilfsdüsen über ein Ventil absperrbar ist. Dadurch wird erreicht, dass die Spülflüssigkeit pulsierend austritt und teilweise das Aussprühen von Spülflüssigkeit aus den Hilfsdüsen vermieden wird.From the EP 1 040 786 A1 a dishwashing machine with pulsating nozzles is known, wherein an arm has a plurality of nozzles which are supplied with each other via different channels. A channel is in connection with so-called auxiliary nozzles, wherein the supply of rinsing liquid to these auxiliary nozzles can be shut off via a valve. This ensures that the rinsing liquid exits pulsating and partially the spraying of rinsing liquid is avoided from the auxiliary nozzles.

Aus der DE 10 2004 018 878 A1 ist eine Geschirrspülmaschine mit einem Sprüharm bekannt, bei dem ohne den Einsatz zusätzlicher Aktoren einzelne Sprühdüsen aktiviert bzw. deaktiviert werden können. Je nach Veränderung des Pumpendrucks kann dadurch ein Pulsieren des Besprühen des Geschirrs erreicht werden, um eine effektive Reinigung zu ermöglichen. Hierfür sind elastische Mittel vorgesehen, die die einzelnen Düsen öffnen und schließen können. Allerdings besteht das Problem, dass der Sprühstrahl bei den vorbekannten Düsen immer entsprechend der Düsenöffnung austritt. Es ist nicht vorgesehen, dass die Sprühstrahlen in der Geometrie verändert werden und daher nicht gut in Problemzonen, beispielsweise bei Töpfen, Spülraumecken oder anderen schwer zugänglichen Bereichen eintreten können. Denn trotz der Möglichkeit eines pulsierenden Betriebes bleibt die Geometrie des austretenden Sprühstrahles vorgegeben.From the DE 10 2004 018 878 A1 a dishwashing machine with a spray arm is known in which individual spray nozzles can be activated or deactivated without the use of additional actuators. Depending on the change in the pump pressure, a pulsation of the spraying of the dishes can be achieved in order to allow effective cleaning. For this purpose elastic means are provided which can open and close the individual nozzles. However, there is the problem that the spray jet in the prior art nozzles always exits according to the nozzle opening. It is not intended that the spray jets be changed in geometry and therefore may not enter well in problem areas such as pots, sink corners or other hard to reach areas. Because despite the possibility of a pulsating operation, the geometry of the exiting spray jet remains predetermined.

Bei der Geschirrspülmaschine gemäß der DE 10 2005 026 558 B3 kommt mindestens ein Sprüharm zum Einsatz, bei dem im Inneren ein rotierendes Element pulsierende Sprühstrahlen erzeugt.In the dishwasher according to the DE 10 2005 026 558 B3 At least one spray arm is used, in which a rotating element generates pulsating sprays inside.

Aus der EP 1 334 687 A1 ist ein Sprüharm mit Sprühdüsen bekannt, deren Sprühstrahlcharakteristik über blendenförmige Betätigungselemente geändert werden kann. Hierzu ist ein manueller Eingriff des Benutzers erforderlich.From the EP 1 334 687 A1 For example, a spray arm with spray nozzles is known whose spray jet characteristic can be changed via diaphragm-shaped actuating elements. For this purpose, a manual intervention of the user is required.

Der vorliegenden Erfindung stellt sich das Problem, einen Geschirrspüler zu schaffen, bei dem aus einfach aufgebauten Sprüharmen die austretende Spülflüssigkeit im Sprühstrahl zumindest teilweise anpassbar ist.The present invention poses the problem of providing a dishwasher in which the flushing liquid emerging in the spray jet can be at least partially adapted from simply constructed spray arms.

Diese Aufgabe wird mit einem Geschirrspüler mit den Merkmalen des Anspruches 1 gelöst.This object is achieved with a dishwasher having the features of claim 1.

Erfindungsgemäß ist vorgesehen, dass innerhalb des Sprüharmes vor mindestens einer Düse ein Strömungshindernis zur Veränderung der Geometrie des Sprühstrahles vorgesehen ist. Es hat sich herausgestellt, dass durch ein Strömungshindernis benachbart zu der Düse aber innerhalb des Sprüharmes die Geometrie des austretenden Sprühstrahles verändert werden kann, so dass dieser nicht nur geradlinig aus dem Sprüharm heraustritt, sondern auch andere Geometrien aufweist, was die Effektivität der Reinigungsleistung erhöht. Denn insbesondere durch die Veränderung der Geometrie des Sprühstrahles lassen sich auch schlecht zugängliche Bereiche, wie bei Töpfen oder in Ecken gut erreichen.According to the invention it is provided that within the spray arm in front of at least one nozzle, a flow obstacle for changing the geometry of the spray jet is provided. It has been found that by a flow obstruction adjacent to the nozzle but within the spray arm, the geometry of the exiting spray jet can be changed so that it not only straight out of the spray arm, but also has other geometries, which increases the effectiveness of the cleaning performance. Because, in particular, by changing the geometry of the spray can also poorly accessible areas, as well as in pots or corners reach.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist der Sprüharm als Hohlkörper ausgebildet und ein Strömungshindernis ist an der zur Düse gegenüberliegenden Innenwand des Hohlkörpers gehalten. Dadurch sind definierte Strömungskanäle innerhalb des Sprüharmes gebildet, so dass das austretende Fluid entsprechend der Gestaltung des Strömungshindernisses und der Düse einen Sprühstrahl erzeugt. Um den Einfluss von Druckschwankungen möglichst gering zu halten, kann dabei das Strömungshindernis bis kurz vor die Austrittsfläche des Sprühstrahles an der Düse ragen, beispielsweise in einem Bereich von weniger als 4 mm.According to a preferred embodiment of the invention, the spray arm is designed as a hollow body and a flow obstacle is held on the opposite to the nozzle inner wall of the hollow body. As a result, defined flow channels are formed within the spray arm, so that the exiting fluid generates a spray jet in accordance with the design of the flow obstacle and the nozzle. In order to keep the influence of pressure fluctuations as low as possible, the flow obstacle may protrude to just before the exit surface of the spray jet at the nozzle, for example in a range of less than 4 mm.

Gemäß einer weiteren Ausgestaltung der Erfindung ist das Strömungshindernis relativ zu der benachbarten Düse bewegbar. Dadurch lässt sich die Gestaltung des Sprühstrahles einstellen, wobei sowohl eine manuelle Einstellung vor dem Spülvorgang als auch eine automatische Einstellung erfolgen kann, beispielsweise abhängig vom Druck.According to a further embodiment of the invention, the flow obstacle is movable relative to the adjacent nozzle. As a result, the design of the spray jet can be adjusted, wherein both a manual adjustment before flushing and an automatic adjustment can take place, for example, depending on the pressure.

Vorzugsweise sind über den Sprüharm verteilt mehrere Düsen vorgesehen, denen jeweils ein Strömungshindernis zugeordnet ist. Dadurch kann je nach Sitz der Düse ein passendes Strömungshindernis der Düse zugeordnet werden. Beispielsweise sind in einem äußeren Bereich Strömungshindernisse von Vorteil, die einen etwas breiteren Sprühstrahl erzeugen, während an dem Sprüharm radial innenliegende Düsen eher einen schmaleren kräftigeren Strahl erzeugen können.Preferably, a plurality of nozzles are provided distributed over the spray arm, each associated with a flow obstacle. As a result, depending on the seat of the nozzle a suitable flow obstruction of the nozzle can be assigned. For example, in an outer region, flow obstacles are advantageous, which produce a somewhat wider spray jet, while radially inner nozzles on the spray arm can produce a narrower, more powerful jet.

Das Strömungshindernis kann vorzugsweise als Zapfen mit einer gerundeten Oberfläche ausgebildet sein, so dass sich ein kegelförmiger Sprühstrahl ergibt. Es ist auch möglich, das Strömungshindernis als V-förmige Rampe, als Wendel oder als Stift auszubilden, um einen bestimmten Sprühstrahl zu produzieren.The flow obstacle may preferably be formed as a pin with a rounded surface, so that there is a conical spray. It is also possible to form the flow obstruction as a V-shaped ramp, as a helix, or as a pin to produce a particular spray.

Die Erfindung wird nachfolgend anhand mehrerer Ausführungsbeispiele mit Bezug auf die beigefügten Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine geschnittene Seitenansicht eines Ausführungsbeispieles eines erfindungsgemäßen Sprüharmes;
Figuren 2A bis 2E
mehrere Detailansichten von unterschiedlichen Strömungshindernissen für einen Sprüharm;
Figur 3
eine geschnittene Seitenansicht eines zweiten Ausführungsbeispieles eines erfindungsgemäßen Sprüharmes;
Figuren 4A und 4B
eine Detailansicht des Sprüharmes der Figur 3 mit einem Strömungshin- dernis in unterschiedlichen Positionen;
Figur 5
eine geschnittene Seitenansicht eines Sprüharmes gemäß einem dritten Ausführungsbeispiel;
Figur 6A
eine Detailansicht eines Strömungshindernisses des Sprüharmes der Figur 5, und
Figur 6 B
eine Detailansicht eines modifizierten Strömungshindernisses für einen Sprüharm gemäß Figur 5.
The invention will be explained in more detail with reference to several embodiments with reference to the accompanying drawings. Show it:
FIG. 1
a sectional side view of an embodiment of a spray arm according to the invention;
FIGS. 2A to 2E
several detailed views of different flow obstacles for a spray arm;
FIG. 3
a sectional side view of a second embodiment of a spray arm according to the invention;
FIGS. 4A and 4B
a detailed view of the spray arm of FIG. 3 with a flow obstacle in different positions;
FIG. 5
a sectional side view of a spray arm according to a third embodiment;
FIG. 6A
a detailed view of a flow obstacle of the spray arm of FIG. 5 , and
FIG. 6B
a detailed view of a modified flow obstacle for a spray arm according to FIG. 5 ,

Ein Sprüharm 1 ist in einem nicht näher gezeigten Spülraum eines Geschirrspülers angeordnet. Er ist als Hohlkörper 2 ausgebildet und mittig an einer zentralen Öffnung mit einem Anschluss 3 zur Verbindung mit einem Leitungssystem des Geschirrspülers versehen. So kann über eine ebenfalls nicht dargestellte Pumpe Spülflüssigkeit in den Sprüharm 1 gepumpt werden. Der Anschluss 3 ist dabei an einer zentralen Drehachse A des Sprüharmes 1 angeordnet.A spray arm 1 is arranged in a washing compartment of a dishwasher, not shown in more detail. It is designed as a hollow body 2 and provided centrally at a central opening with a connection 3 for connection to a pipe system of the dishwasher. Thus, rinsing fluid can be pumped into the spray arm 1 via a pump, also not shown. The connection 3 is arranged on a central axis of rotation A of the spray arm 1.

An dem Hohlkörper 2 sind in einer ersten Wand 4 mehrere Düsen 5 ausgebildet, über die Spülflüssigkeit auf nicht näher gezeigtes Spülgut versprüht werden kann. Ferner können ein oder mehrere Antriebsdüsen 6 vorgesehen sein, die für ein Rotieren des Sprüharmes 1 während des Spülbetriebes sorgen. Die Düsen 5 können, wie in den Figuren gezeigt, nach oben gerichtet sein. Alternativ ist auch eine Ausrichtung nach unten denkbar, um unter dem Sprüharm befindliches Spülgut zu reinigen.On the hollow body 2 a plurality of nozzles 5 are formed in a first wall 4, can be sprayed via the rinsing liquid not shown in detail ware. Furthermore, one or more drive nozzles 6 can be provided, which ensure a rotation of the spray arm 1 during the rinsing operation. The nozzles 5 may be directed upward as shown in the figures. Alternatively, downward orientation is also conceivable in order to clean dishes under the spray arm.

Zumindest vor einem Teil der Düsen 5 sind in dem Hohlkörper 2 Strömungshindernisse 8 angeordnet, die sich von der gegenüber liegenden Wand 7 des Hohlkörpers 2 in Richtung der Düsen 5 erstrecken. Jedes Strömungshindernis 8 ist dabei einer Düse 5 zugeordnet.At least in front of part of the nozzles 5, flow obstacles 8 are arranged in the hollow body 2, which extend from the opposite wall 7 of the hollow body 2 in the direction of the nozzles 5. Each flow obstacle 8 is associated with a nozzle 5.

Die Funktion des Strömungshindernisses wird mit Bezug auf die Figuren 2A bis 2E erläutert.The function of the flow obstacle is with respect to the FIGS. 2A to 2E explained.

In Figur 2A ist eine Düse 5 eines Sprüharmes gezeigt, so wie sie im Stand der Technik Verwendung findet. Die Düse 5 ist nach oben gerichtet und weist eine Austrittsfläche 9 auf, durch die die Spülflüssigkeit in einem punktförmigen Strahl 10 austritt. Durch den Volumenstrom kann der Strahl 10 an Spülflüssigkeit in der Intensität variiert werden, nicht jedoch in der Geometrie. Die Strahtform bleibt somit gleich.In FIG. 2A a nozzle 5 of a spray arm is shown, as used in the prior art. The nozzle 5 is directed upwards and has an exit surface 9, through which the rinsing liquid emerges in a punctiform jet 10. Due to the volume flow, the jet 10 can be varied in intensity in flushing liquid, but not in the geometry. The ray shape thus remains the same.

In Figur 2B ist der erfindungsgemäße Sprüharm 1 mit dem Strömungshindernis 8 dargestellt, das als Zapfen ausgebildet ist und eine gerundete Oberfläche aufweist, vorzugsweise als Halbkugel, die benachbart zu der Düse 5 angeordnet ist. Das Strömungshindernis 8 ist dabei direkt benachbart zu der Düse 5 vor der kreisförmigen Austrittsfläche 9 angeordnet, so dass die Strömung der Spülflüssigkeit auf dem Weg in die Düse 5 beeinflusst wird. Dadurch wird die Form eines Strahls 11 aus der Düse 5 verändert, so dass aufgrund des zapfenförmigen Strömungshindernisses 8 der Strahl aus der Austrittsfläche 9 kegelförmig austritt. Durch diese Strahlform lässt sich ein größerer Bereich abdecken, der mit Spülflüssigkeit versorgt wird.In FIG. 2B the spray arm 1 according to the invention is shown with the flow obstacle 8, which is designed as a pin and has a rounded surface, preferably as a hemisphere, which is arranged adjacent to the nozzle 5. The flow obstacle 8 is arranged directly adjacent to the nozzle 5 in front of the circular exit surface 9, so that the flow of the rinsing liquid is influenced on the way into the nozzle 5. As a result, the shape of a jet 11 is changed out of the nozzle 5, so that due to the peg-shaped flow obstacle 8, the jet emerges from the outlet surface 9 in a cone shape. This jet shape can cover a larger area, which is supplied with rinsing liquid.

In Figur 2C ist ein modifiziertes Strömungshindernis 18 in dem Sprüharm 1 angeordnet, das als dünner Stift ausgebildet ist, der durch die Düse 5 ragt. Dabei ist eine Spitze 19 außerhalb der Austrittsfläche 9 der Düse 5 angeordnet. Durch diese Ausgestaltung des Strömüngshindernisses als dünner durch die Austrittsfläche 9 ragenden Stift 18 wird ein Sprühstrahl 20 gebildet, der als Hohlkegel ausgebildet ist. Durch die kegelförmige Aufspreizung des Strahles wird einerseits eine relativ große Sprühfläche abgedeckt und andererseits ist der Volumenstrom im Bereich der Außenfläche des Hohlkegelstrahls 20 größer als bei einem Vollkegelstrahl 11.In Figure 2C a modified flow obstruction 18 is arranged in the spray arm 1, which is designed as a thin pin which projects through the nozzle 5. In this case, a tip 19 is arranged outside the exit surface 9 of the nozzle 5. As a result of this configuration of the flow obstacle as a thin pin projecting through the exit surface 9, a spray jet 20 is formed, which is designed as a hollow cone. Due to the cone-shaped spreading of the jet, on the one hand a relatively large spray area is covered and on the other hand the volume flow in the area of the outer surface of the hollow cone jet 20 is greater than in the case of a full cone jet 11.

Bei dem in Figur 2D gezeigten Ausführungsbeispiel für ein Strömungshindernis 28 ist an dem Boden 7 des Hohlkörpers eine Rampe ausgebildet, die sich wandförmig erstreckt und benachbart zu der Düse 5 V-förmig ausgebildet ist, so dass sich zu der Düse 5 gerichtete Schrägen 29 ausbilden. Dadurch wird der aus der Austrittsfläche 9 austretende Sprühstrahl 30 als Flachstrahl ausgebildet, der sich keilförmig erweitert.At the in FIG. 2D shown embodiment for a flow obstacle 28 is formed on the bottom 7 of the hollow body, a ramp which extends in a wall shape and adjacent to the nozzle 5 is V-shaped, so that directed to the nozzle 5 slopes 29 form. As a result, the spray jet 30 emerging from the exit surface 9 is formed as a flat jet, widening wedge-shaped.

In Figur 2E ist eine weitere Ausführungsform eines Strömungshindernisses 38 dargestellt, das als Wendel mit einem schraubenförmigen Kanal 39 versehen ist. Diese Wendel endet kurz vor der Austrittsfläche 9 der Düse 5, so dass der austretende Strahl 40 als ein Wirbelstrahl ausgebildet ist.In Figure 2E another embodiment of a flow obstacle 38 is shown, which is provided as a helix with a helical channel 39. This helix ends shortly before the exit surface 9 of the nozzle 5, so that the outgoing jet 40 is formed as a vortex jet.

Bei den Ausführungsformen der Figuren 2B bis 2E bildet das Strömungshindernis 8, 18, 28 und 38 eine Art Drossel für die Düse 5 aus, so dass aufgrund der vorbestimmten Strömungsverhältnisse benachbart zu der Düse 5 eine bestimmte Geometrie an Sprühstrahl 11, 20, 30 oder 40 erzeugt wird, die gegebenenfalls auch abhängig vom Volumenstrom ist. Durch die Variation der Geometrie des Sprühstrahles können aber auch schlecht zugängliche Bereiche innerhalb eines Spülraumes eines Geschirrspülers erreicht werden. Eine Verstellmöglichkeit ist bei diesem Ausführungsbeispiel nicht vorgesehen, da die Strömungshindernisse 8, 18, 28 und 38 fest mit dem Boden 7 des Sprüharmes 1 verbunden sind.In the embodiments of the Figures 2B to 2E the flow obstacle 8, 18, 28 and 38 forms a kind of throttle for the nozzle 5, so that due to the predetermined flow conditions adjacent to the nozzle 5, a certain geometry of spray jet 11, 20, 30 or 40 is generated, which may also depend on Volume flow is. By varying the geometry of the spray but also poorly accessible areas can be achieved within a washing compartment of a dishwasher. An adjustment is not provided in this embodiment, since the flow obstacles 8, 18, 28 and 38 are fixedly connected to the bottom 7 of the spray arm 1.

Bei dem in Figur 3 gezeigten Ausführungsbeispiel ist ein Sprüharm 1 vorgesehen, der wiederum als Hohlkörper 2 mit einem mittigen Anschluss 3 ausgebildet ist, wobei der Anschluss 3 entlang einer zentralen Drehachse A angeordnet ist. Der Hohlkörper 2 besitzt in seiner oberen Wand 4 Düsen 5 und außerdem ein oder mehrere Antriebsdüsen 6. Hier erstreckt sich innerhalb des Hohlkörpers 2 ausgehend von der gegenüber liegenden Wand 7 jeweils ein Strömungshindernis 8' in Richtung einer Düse, das verstellbar an dem Boden 7 des Sprüharmes 2 gehalten ist. Das Strömungshindernis 8' ist dabei als Zapfen mit einer abgerundeten Oberfläche ausgebildet, wobei an dem Zapfen 8' ein Außengewinde 9' angeformt ist, das in Eingriff mit einem Gewinde (nicht dargestellt) an der Wand 7 steht. Dadurch kann durch Drehen des Zapfens 8' das Strömungshindernis näher zur Düse 5 oder weg von der Düse 5 bewegt werden.At the in FIG. 3 In the embodiment shown, a spray arm 1 is provided which, in turn, is designed as a hollow body 2 with a central connection 3, the connection 3 running along a central axis of rotation A is arranged. The hollow body 2 has in its upper wall 4 nozzles 5 and also one or more drive nozzles 6. Here extends within the hollow body 2, starting from the opposite wall 7 each have a flow obstacle 8 'in the direction of a nozzle which is adjustable on the bottom 7 of the Low spray 2 is held. The flow obstacle 8 'is designed as a pin with a rounded surface, wherein on the pin 8' an external thread 9 'is formed, which is in engagement with a thread (not shown) on the wall 7. As a result, the flow obstacle can be moved closer to the nozzle 5 or away from the nozzle 5 by turning the pin 8 '.

In Figur 4A wird der Zapfen 8' über ein nicht dargestelltes Werkzeug, das in Eingriff mit einem Schlitz 10' steht, von der Düse 5 wegbewegt, so dass die Beeinflussung des Strömungsweges der Spülflüssigkeit geringer wird und insofern die Geometrie des aus der Düse 5 austretenden Sprühstrahles verändert wird.In FIG. 4A the pin 8 'is moved away from the nozzle 5 via a tool, not shown, which is in engagement with a slot 10', so that the influencing of the flow path of the rinsing liquid is reduced and insofar the geometry of the jet emerging from the nozzle 5 is changed ,

Bei der in Figur 4B gezeigten Position des Zapfens 8' ist die halbkugelförmige Oberfläche unmittelbar benachbart zu der Düse 5 angeordnet, so dass der Strömungsweg der Spülflüssigkeit zu der Düse 5 relativ stark beeinflusst ist, so dass der austretende Strahl eine weiter aufgefächerte Geometrie besitzt, als bei der in Figur A gezeigten Position. Insofern kann der Benutzer durch manuelles Eindrehen oder Ausdrehen der Zapfen 8' an dem Sprüharm 1' die Geometrie des Sprühstrahles einstellen.At the in FIG. 4B 1, the hemispherical surface is arranged immediately adjacent to the nozzle 5, so that the flow path of the rinsing liquid to the nozzle 5 is relatively strongly influenced, so that the outgoing jet has a fanned-out geometry than in the case of FIG shown position. In this respect, the user can adjust the geometry of the spray jet by manually screwing or unscrewing the pins 8 'on the spray arm 1'.

In Figur 3 sind Strömungshindernisse in Form von Zapfen 8' dargestellt, wobei es natürlich auch möglich ist, die in den Figuren 2C bis E gezeigten Strömungshindernisse 18, 28 oder 38 je nach Bedarf an den einzelnen Düsen 5 vorzusehen.In FIG. 3 Flow obstacles are shown in the form of pin 8 ', wherein it is of course also possible in the FIGS. 2C to E shown flow obstacles 18, 28 or 38 as needed to provide the individual nozzles 5.

In Figur 5 ist eine weitere Ausführungsform eines erfindungsgemäßen Sprüharmes 1 gezeigt, der als Hohlkörper 2 ausgebildet ist und um eine zentrale Rotationsachse 4 einen Anschluss 3 aufweist. Der Hohlkörper 2 weist über die Länge verteilt mehrere Düsen 5 auf, wobei als Rotationsantrieb auch Antriebsdüsen 6 vorgesehen sind.In FIG. 5 a further embodiment of a spray arm 1 according to the invention is shown, which is designed as a hollow body 2 and has a connection 3 around a central axis of rotation 4. The hollow body 2 has distributed over the length of a plurality of nozzles 5, wherein drive nozzles 6 are provided as a rotary drive.

Benachbart zu den Düsen 5 sind als Strömungshindernisse Zapfen 8" mit gerundeter Oberfläche vorgesehen. Diese sind allerdings nicht fest an der den Düsen 5 gegenüber liegenden Wand 7 des Hohlkörpers 2 angeordnet, sondern über ein Federelement 9" bewegbar. Dadurch ist der Abstand des Strömungshindernisses 8" zu der Düse 5 abhängig von dem Druck innerhalb des Sprüharmes 1, so dass bei erhöhter Pumpendrehzahl die Strömungshindernisse 8" weiter von der Düse 5 weggedrückt werden als bei niedriger Pumpendrehzahl. Dadurch wird abhängig vom Druck innerhalb des Sprüharmes 1 der Sprühstrahl aus den Düsen 5 variiert.Adjacent to the nozzles 5 are provided as flow obstacles pins 8 "with a rounded surface, but these are not fixedly arranged on the nozzle 5 opposite wall 7 of the hollow body 2, but via a spring element 9" movable. Thereby, the distance of the flow obstacle 8 "to the nozzle 5 is dependent on the pressure within the spray arm 1, so that at increased pump speed, the flow obstacles 8" further pushed away from the nozzle 5 than at low pump speed. As a result, the spray jet is varied from the nozzles 5 depending on the pressure within the spray arm 1.

In Figur 6A ist die Lagerung des in Figur 5 gezeigten Strömungshindernisses 8" vergrößert dargestellt. Der Zapfen 8" ist an einer Schraubenfeder 9", vorzugsweise aus Stahl gelagert, wobei die Feder 9" an einer Aufnahme 10" an der Wand 7 des Sprüharmes 1" abgestützt ist.In FIG. 6A is the storage of in FIG. 5 The pin 8 "is mounted on a helical spring 9", preferably made of steel, the spring 9 "being supported on a receptacle 10" on the wall 7 of the spray arm 1 ".

Entsprechend Figur 6B ist es auch möglich, an der Wand 7 des Sprüharmes 1 eine Membran 9"' vorzusehen, an der dann ein Strömungshindernis 8'" in Form eines Zapfens bewegbar gelagert ist.Corresponding FIG. 6B it is also possible to provide on the wall 7 of the spray arm 1, a membrane 9 "', on which then a flow obstacle 8'" is movably mounted in the form of a pin.

Auch bei einer federnden Lagerung der Strömungshindernisse 8" oder 8'" kann die Geometrie der Strömungshindernisse relativ frei gewählt werden, insbesondere können die in den Figuren 2C bis 2E gezeigten Strömungshindernisse ebenfalls federnd gelagert werden.Even with a resilient mounting of the flow obstacles 8 "or 8 '", the geometry of the flow obstacles can be chosen relatively freely, in particular, in the FIGS. 2C to 2E shown flow obstacles are also resiliently mounted.

In den gezeigten Ausführungsbeispielen sind die Strömungshindernisse 8 entweder fest an dem Boden 7, verstellbar an dem Boden 7 oder federnd an dem Boden 7 gelagert. Es ist natürlich auch möglich, an einem Sprüharm unterschiedliche Strömungshindernisse 8 vorzusehen, die teilweise fest, teilweise verstellbar und teilweise federnd gelagert sind. Zudem kann die Geometrie der Strömungshindernisse innerhalb eines Sprüharmes abweichen, so dass unterschiedliche Geometrien an Sprühstrahlen an den einzelnen Düsen 5 erzeugt werden können. Dabei kann statt einer kreisförmigen Austrittsfläche an der Düse 5 auch ein Schlitzloch oder eine andere Geometrie vorgesehen sein.In the embodiments shown, the flow obstacles 8 are either fixedly mounted on the bottom 7, adjustable on the bottom 7 or resiliently on the bottom 7. It is of course also possible to provide different flow obstacles 8 on a spray arm, which are partially fixed, partially adjustable and partially spring-mounted. In addition, the geometry of the flow obstacles may differ within a spray arm, so that different geometries of spray jets at the individual nozzles 5 can be generated. In this case, instead of a circular exit surface on the nozzle 5, a slot hole or another geometry may be provided.

Claims (12)

  1. A dishwasher comprising a washing chamber in which is rotatably mounted at least one spray arm (1) which is provided with a plurality of nozzles (5, 6) for spraying wash water, said nozzles being supplied with wash water by a pump,
    characterized in,
    that a flow obstacle (8, 8', 8", 8"', 18, 28, 38) is provided within the spray arm (1) upstream of at least one nozzle (5) to change the geometry of the spray jet (11, 20, 30, 40).
  2. The dishwasher as recited in claim 1,
    characterized in,
    that the spray arm (1) takes the form of a hollow member (2, 2', 2"), and a flow obstacle (8, 8', 8", 8"', 18, 28, 38) is held to the inner wall of the hollow member (2, 2', 2") opposite the nozzle (5).
  3. The dishwasher as recited in claim 1 or 2,
    characterized in,
    that the flow obstacle (8, 8', 8", 8"', 18, 28, 38) extends into close proximity to the exit area of the spray jet at the nozzle (5).
  4. The dishwasher as recited in one of claims 1 through 3,
    characterized in,
    that the flow obstacle (8, 8', 8", 8"', 18, 28, 38) is movable relative to the nozzle (5) located in the vicinity thereof.
  5. The dishwasher as recited in one of claims 1 through 4,
    characterized in,
    that the spray arm (1) is provided with a plurality of distributed nozzles which are each associated with a flow obstacle (8, 8', 8", 8"', 18, 28, 38).
  6. The dishwasher as recited in one of claims 1 through 5,
    characterized in,
    that the flow obstacle is in the form of a peg (8, 8', 8", 8"') having a rounded surface, preferably in the form of a hemisphere.
  7. The dishwasher as recited in one of claims 1 through 6,
    characterized in,
    that the flow obstacle takes the form of a V-shaped ramp (28).
  8. The dishwasher as recited in one of claims 1 through 7,
    characterized in,
    that the flow obstacle includes a helix (38) for swirling the wash water upstream of the nozzle.
  9. The dishwasher as recited in one of claims 1 through 8,
    characterized in,
    that the flow obstacle includes a pin (18) projecting into the exit area of the spray jet at the nozzle.
  10. The dishwasher as recited in one of claims 1 through 9,
    characterized in,
    that each flow obstacle (8') is adjustable in position relative to the nozzle located in the vicinity thereof.
  11. The dishwasher as recited in one of claims 1 through 10,
    characterized in,
    that each flow obstacle (8", 8"') is movably supported by a spring (9", 9"').
  12. The dishwasher as recited in one of claims 1 through 11,
    characterized in,
    that a spray arm is provided with a plurality of nozzles (5) which are associated with different flow obstacles (8, 8', 8", 8"', 18, 28, 38).
EP08785206A 2007-08-14 2008-07-30 Dishwasher Active EP2192852B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08785206T PL2192852T3 (en) 2007-08-14 2008-07-30 Dishwasher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007038469 2007-08-14
PCT/EP2008/006260 WO2009021626A1 (en) 2007-08-14 2008-07-30 Dishwasher

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EP2192852A1 EP2192852A1 (en) 2010-06-09
EP2192852B1 true EP2192852B1 (en) 2011-09-14

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AT (1) ATE524099T1 (en)
ES (1) ES2369727T3 (en)
PL (1) PL2192852T3 (en)
WO (1) WO2009021626A1 (en)

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US11026555B2 (en) 2015-12-21 2021-06-08 Electrolux Appliances Aktiebolag Dishwasher comprising a wash arm arrangement
US11464391B2 (en) 2017-10-31 2022-10-11 Electrolux Appliances Aktiebolag Spray arm assembly

Also Published As

Publication number Publication date
ES2369727T3 (en) 2011-12-05
WO2009021626A1 (en) 2009-02-19
ATE524099T1 (en) 2011-09-15
US20110203619A1 (en) 2011-08-25
PL2192852T3 (en) 2011-12-30
EP2192852A1 (en) 2010-06-09

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