EP2484265B1 - Method for manufacturing a dishwasher and dishwasher - Google Patents

Method for manufacturing a dishwasher and dishwasher Download PDF

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Publication number
EP2484265B1
EP2484265B1 EP12152276.7A EP12152276A EP2484265B1 EP 2484265 B1 EP2484265 B1 EP 2484265B1 EP 12152276 A EP12152276 A EP 12152276A EP 2484265 B1 EP2484265 B1 EP 2484265B1
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EP
European Patent Office
Prior art keywords
sealing
bed
acrylic resin
lacquer
sealing bed
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EP12152276.7A
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German (de)
French (fr)
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EP2484265A3 (en
EP2484265A2 (en
Inventor
Hans Gebauer
Peter Karl
Christian Noje
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2484265A3 publication Critical patent/EP2484265A3/en
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    • 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
    • A47L15/4251—Details of the casing
    • A47L15/4257—Details of the loading door
    • A47L15/4263—Door sealing arrangements

Definitions

  • the invention relates to a method for producing a dishwasher, in particular a domestic dishwasher, according to the preamble of claim 1 and a dishwasher according to the preamble of claim 8.
  • a method for corrosion protection of sealing channels, in particular in water-bearing devices with at least one sealing channel, which essentially has a polygonal cross-section for the exception of a sealing spring is, for example, from the document DE 101 56 422 A1 known.
  • a substantial area of the sealing channel is provided with a sealing coating material before the sealing chain is inserted into the sealing channel.
  • the sealing coating material preferably has a lacquer-like consistency and preferably consists of organo-functional silanes and their metal compounds.
  • the publication EP 0 610 831 A2 discloses a process for preparing functional coatings with organo-functional silanes of a metal compound and low-volatility oxides, wherein in a first step a hydrolytic condensation of at least one crosslinkable organo-functional silane and of at least one metal compound is carried out. In a second step, an organic crosslinkable prepolymer is added to this hydrolytic condensate, before, in a third step, the coating solution thus obtained is applied to a substrate and then cured. Furthermore, this publication also discloses a coating material for the production of coatings on substrates, wherein at least one organofunctional silane prepared and crosslinkable by the disclosed process is used.
  • rinsing containers of a dishwashing machine may, for example, be made of a box-shaped container jacket forming the bottom wall, the two side walls and the top wall. Its rear side is closed, for example, with a sheet metal part serving as a rear wall.
  • a sealing bed for the door seal of the dishwasher can be formed in the front of the container shell.
  • the container jacket with the sealing bed integrated therein is made of a high-grade CrNi steel sheet in order to prevent crevice corrosion within the sealing bed.
  • a dishwashing machine in which the door seal for the appliance door is inserted in a sealing bed made of sheet steel.
  • the sealing bed is formed as a separate from the washing compartment frame part.
  • the frame part is connected by means of welded connection with the front side of the container jacket of the washing compartment.
  • the container shell of the washing is made of a cheaper Cr-steel.
  • the associated front frame part is made of high-grade CrNi steel.
  • the object of the invention is to provide a method for producing a dishwasher and a dishwasher, by which manufacturing technology easily and with reduced material and manufacturing costs corrosion resistance in the region of the sealing bed of the door seal for the door of a dishwasher, especially a domestic dishwasher is achieved ,
  • an acrylic resin lacquer is used as the liquid lacquer, that the acrylic resin lacquer is applied by utilizing capillary forces in the connecting joint or in the capillary gap and that the acrylic resin lacquer is cured in the connecting joint or in the capillary gap.
  • a corrosion resistance in the region of the sealing bed of the door seal for the appliance door of a dishwashing machine, in particular a domestic dishwasher can be achieved in a simple manufacturing process and with reduced material and production costs.
  • At least partial regions of the sealing bed, in particular together with at least one container wall of the washing container, are preferably formed from a jacket plate.
  • the curing can be done for example by infrared drying using an infrared radiator.
  • infrared drying using an infrared radiator.
  • it is sufficient to treat the surface of the sealing bed which is in contact with the door-sealing element and thus particularly susceptible to crevice corrosion with acrylic resin paint.
  • the sealing bed can therefore be formed of the same material and / or in one piece with the container shell of the washing, in contrast to the above-mentioned prior art, wherein the formation of this component unit, the use of inexpensive Cr-steel is sufficient. Corresponding can be completely dispensed with the use of CrNi steel in the manufacture of the washing.
  • liquid paint layer of acrylic resin with a material thickness in a range of 1 to 5 microns, in particular in a range of 2 to 3 microns, sufficient corrosion protection can be achieved.
  • the required material usage is correspondingly low in order to achieve the necessary corrosion protection in the region of the sealing bed of the door seal for the appliance door of a dishwasher, in particular a domestic dishwasher.
  • the sealing base and an outer side of the groove wall of the sealing bed in the device side direction can be formed as an outwardly graded expression directly in the container shell of the washing.
  • the inner groove wall of the sealing bed may in contrast be formed by a separate sheet metal strip, which is welded to the container casing of the washing. In such a construction, therefore, results between the sealing base and, formed by the metal strip inner groove wall a connecting joint or a capillary gap, in which moisture can collect disadvantageously.
  • the corrosion protection layer can cover in particular the open in the sealing bed interior joint.
  • a gap between the sheet metal part ends is to be understood with very small gap width. Due to the surface effects, which are very prominent in comparison to larger gap widths, the capillarity increasingly occurs in the capillary gap, in which the liquid lacquer, due to its surface tension, becomes caulked in the capillary gap and can no longer flow out until the curing is complete.
  • the corrosion protection layer can, as already mentioned above, preferably be applied in liquid form as a special lacquer in the sealing bed.
  • the still liquid special coating can easily be incorporated by capillary action in the above-mentioned joint between the metal strip and the container shell. This ensures that the dense bed room is sealed corrosion-resistant.
  • the application of the anticorrosive layer takes place after assembly or molding of the sealing bed.
  • the anticorrosive layer can preferably be introduced first into the sealing bed in liquid form by means of a spraying device.
  • a correct position applying the corrosion protection layer within the sealing bed is of great importance in order to avoid optically disadvantageous traces of the special paint outside of the sealing bed.
  • a so-called signature spray device which can spray the special paint into the sealing bed without fogging is suitable. Additional covering measures outside of the sealing bed are therefore not required.
  • the introduction of the special lacquer is preferably carried out by a robot-controlled marking spray gun. Subsequently, the applied special lacquer is dried by infrared drying.
  • the anticorrosive layer can also already be applied to the still planar jacket plate before the assembly or the shaping of the sealing bed or the rinsing container.
  • a screen printing process or also a Signiersprüh compiler is particularly suitable.
  • the sheet metal strip which delimits the sealing bed on the inside in an assembled or formed state can hereby be provided with the corrosion protection layer at least in some areas.
  • Fig. 1 a front-side door sealing region of a dishwasher designed in the present embodiment as a household dishwasher.
  • the dishwasher has a washing container 1, which consists of a in the Fig. 3
  • Example shown planar cover plate 3 is made.
  • the jacket plate 3 is formed in a bending process so that a box-shaped container shell, consisting of a bottom wall, a top wall and two side walls arises.
  • the rear side of the container jacket is closed in the present embodiment by a sheet metal part serving as a rear wall.
  • the front side of the container casing forms a feed opening 5, which in a known manner is surrounded by a rubber-like door seal element 7.
  • the door seal member 7 is in Fig. 1 shown dotted in an undeformed state.
  • the front sheet metal part geometry of a lateral container wall 9 of the washing compartment 1 is shown, which has a groove-shaped sealing bed 6 into which the door sealing element 7 is inserted.
  • the container wall 9 to the front side out in the device side direction x stepped outward expression.
  • the latter forms a sealing base 13 of the sealing bed 6 that is angled outward about a bending edge 11 and that merges via a further outer bending edge 15 into an outer groove wall 17 of the sealing bed 6 that is parallel to the container wall 9.
  • the outer groove wall 17 is extended to the front side up to an outwardly angled front flange 19.
  • the groove side 21 inner groove wall 21 in the housing side direction is formed by a separate sheet metal strip 22, which is fixed to the inside of the container wall 9 by spot welding.
  • the door seal 7 is used, which is in the closed dishwasher in sealing contact with the dashed lines indicated inner door 23 of a door.
  • the container casing of the washing compartment 1 is also fastened on the front side on a circumferential front frame 25 in a known side.
  • both the rinsing container 1 and the step-shaped form integrally formed thereon in one piece and in one piece are made of a corrosion-susceptible, but less expensive Cr sheet steel.
  • the sealing bed 6 Around Within the sealing bed 6 to avoid the risk of crevice corrosion, the sealing bed 6 on its, the door seal 7 facing surface on a corrosion protection layer of acrylic resin lacquer 27, which is applied as a liquid paint with low material thickness in a range of 2 to 3 microns.
  • the corrosion protection layer of acrylic resin paint 27 is in the Fig. 1 shown with exaggerated material thickness. Accordingly, the corrosion protection layer of acrylic resin paint 27 covers both the lateral groove walls 17, 21 and the sealing base 13. As shown in Fig.1 Furthermore, the particularly corrosion-prone joint 29 between the sealing base 13 and the inner groove wall 21 oriented at right angles thereto is also covered by the corrosion protection layer of acrylic resin lacquer 27.
  • the corrosion protection layer of acrylic resin lacquer 27 according to the invention can be introduced into the sealing bed 6 in different ways. According to the Fig. 2 the application of the corrosion protection layer of acrylic resin lacquer 27 takes place after the completion of the washing container 1 and the sealing bed 6. A robot-controlled signing spray gun 31 with its picking nozzle is moved into the sealing bed 6 and the acrylic resin lacquer 27 is applied. The acrylic resin paint 27 is subsequently dried in a curing step and cured.
  • Fig. 3 a further variant for applying the corrosion protection layer of acrylic resin lacquer 27 is shown, in contrast to Fig. 2 is already applied to the still planar jacket 3 prior to a shaping of the washing compartment 1 and thus the sealing bed 6.
  • the application of the cross-hatched corrosion protection layer of acrylic resin lacquer 27 is carried out according to the Fig. 3 only in that, the sealing bed 6 forming region of the jacket plate 3.
  • the in the Fig. 3 still held as a separate component sheet metal strip 22, which also forms the inner groove wall 21 in a molded and assembled state, is also provided on its, in assembly position of the door seal 7 facing surface with the corrosion protection layer of acrylic resin paint 27.

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  • Gasket Seals (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Geschirrspülmaschine, insbesondere eine Haushaltsgeschirrspülmaschine, gemäß dem Oberbegriff des Anspruchs 1 sowie eine Geschirrspülmaschine gemäß dem Oberbegriff des Anspruchs 8.The invention relates to a method for producing a dishwasher, in particular a domestic dishwasher, according to the preamble of claim 1 and a dishwasher according to the preamble of claim 8.

Ein Verfahren zum Korrosionsschutz von Dichtungskanälen, insbesondere bei wasserführenden Geräten mit mindestens einem Dichtungskanal, der im Wesentlichen einen polygonförmigen Querschnitt zur Ausnahme eines Dichtungskeders ausweist, ist beispielsweise aus der Druckschrift DE 101 56 422 A1 bekannt. Bei diesem Verfahren ist vorgesehen, dass ein wesentlicher Bereich des Dichtungskanals mit einem dichtenden Beschichtungsmaterial versehen wird, bevor der Dichtungskeder in den Dichtungskanal eingesetzt wird. Das dichtende Beschichtungsmaterial weist bevorzugt eine lackartige Konsistenz auf und besteht bevorzugt aus organo-funktionellen Silanen und deren Metallverbindungen. In durchgeführten Versuchen mit Geschirrspülmaschinen, insbesondere Haushaltsgeschirrspülmaschinen, deren Dichtbett für das Türdichtungselement mit diesem dichtenden Beschichtungsmaterial versehen war, hat sich nach 80 bis 100 Spülgängen ein vollständiger Abtrag des dichtenden Beschichtungsmaterials, nicht zuletzt aufgrund der geringen thermischen Beständigkeit von organo-funktionellen Silanen, gezeigt, so dass kein effektiver Korrosionsschutz in dem Dichtbett des Türdichtungselements für die Gerätetür der Geschirrspülmaschine mehr gegeben war.A method for corrosion protection of sealing channels, in particular in water-bearing devices with at least one sealing channel, which essentially has a polygonal cross-section for the exception of a sealing spring is, for example, from the document DE 101 56 422 A1 known. In this method it is provided that a substantial area of the sealing channel is provided with a sealing coating material before the sealing chain is inserted into the sealing channel. The sealing coating material preferably has a lacquer-like consistency and preferably consists of organo-functional silanes and their metal compounds. In experiments with dishwashers, especially household dishwashers, whose sealing bed for the door sealing element was provided with this sealing coating material, a complete removal of the sealing coating material has been shown after 80 to 100 rinses, not least because of the low thermal stability of organo-functional silanes so that no effective corrosion protection in the sealing bed of the door sealing element for the appliance door of the dishwasher was given more.

Die Druckschrift EP 0 610 831 A2 offenbart ein Verfahren zur Herstellung von funktionellen Beschichtungen mit organo-funktionellen Silanen einer Metallverbindung und schwerflüchtigen Oxiden, wobei man in einem ersten Schritt eine hydrolytische Kondensation von mindestens einem vernetzbaren organo-funktionellen Silan und von mindestens einer Metallverbindung durchführt. In einem zweiten Schritt gibt man zu diesem hydrolytischen Kondensat ein organisches vernetzbares Prepolymer hinzu, ehe man in einem dritten Schritt die so erhaltene Beschichtungslösung auf ein Substrat aufbringt und anschließend aushärtet. Ferner offenbart diese Druckschrift auch ein Beschichtungsmaterial zur Herstellung von Beschichtungen auf Substraten, wobei mindestens ein nach dem offenbarten Verfahren hergestelltes und vernetzbares organofunktionelles Silan verwendet wird.The publication EP 0 610 831 A2 discloses a process for preparing functional coatings with organo-functional silanes of a metal compound and low-volatility oxides, wherein in a first step a hydrolytic condensation of at least one crosslinkable organo-functional silane and of at least one metal compound is carried out. In a second step, an organic crosslinkable prepolymer is added to this hydrolytic condensate, before, in a third step, the coating solution thus obtained is applied to a substrate and then cured. Furthermore, this publication also discloses a coating material for the production of coatings on substrates, wherein at least one organofunctional silane prepared and crosslinkable by the disclosed process is used.

Allgemein kann Spülbehälter einer Geschirrspülmaschine zum Beispiel aus einem die Bodenwand, die beiden Seitenwände und die Deckwand bildenden kastenförmigen Behältermantel ausgeführt sein. Dessen Rückseite wird zum Beispiel mit einem als Rückwand dienenden Blechteil geschlossen. In der Vorderseite des Behältermantels kann demgegenüber ein Dichtbett für die Türdichtung der Geschirrspülmaschine eingeformt sein. Üblicherweise ist der Behältermantel mit dem darin integrierten Dichtbett aus einem hochwertigen CrNi-Stahlblech hergestellt, um innerhalb des Dichtbetts eine Spaltkorrosion zu vermeiden.In general, rinsing containers of a dishwashing machine may, for example, be made of a box-shaped container jacket forming the bottom wall, the two side walls and the top wall. Its rear side is closed, for example, with a sheet metal part serving as a rear wall. In contrast, a sealing bed for the door seal of the dishwasher can be formed in the front of the container shell. Usually, the container jacket with the sealing bed integrated therein is made of a high-grade CrNi steel sheet in order to prevent crevice corrosion within the sealing bed.

Aus der Druckschrift DE 10 2005 062 478 A1 ist eine Geschirrspülmaschine bekannt, bei der die Türdichtung für die Gerätetür in einem aus Stahlblech hergestellten Dichtbett eingesetzt ist. Gemäß diesem Stand der Technik ist das Dichtbett als ein von dem Spülbehälter separates Rahmenteil ausgebildet. Das Rahmenteil ist mittels Schweißverbindung mit der Frontseite des Behältermantels des Spülbehälters verbunden. Zur Reduzierung der Materialkosten ist der Behältermantel des Spülbehälters aus einem kostengünstigeren Cr-Stahl hergestellt. Demgegenüber ist das damit verbundene frontseitige Rahmenteil aus hochwertigem CrNi-Stahl hergestellt. Diese mehrteilige Ausführung des Spülbehälters, bestehend aus dem Behältermantel und dem frontseitigen Rahmenteil, in dem das Dichtbett integriert ist, ist fertigungstechnisch aufwändig. Außerdem ist bei der Fertigung des Spülbehälters für das frontseitige Rahmenteil nach wie vor der Einsatz von kostspieligem CrNi-Stahl erforderlich, um eine Korrosionsbeständigkeit in dem Dichtbett der Türdichtung zu gewährleisten.From the publication DE 10 2005 062 478 A1 a dishwashing machine is known in which the door seal for the appliance door is inserted in a sealing bed made of sheet steel. According to this prior art, the sealing bed is formed as a separate from the washing compartment frame part. The frame part is connected by means of welded connection with the front side of the container jacket of the washing compartment. To reduce the cost of materials, the container shell of the washing is made of a cheaper Cr-steel. In contrast, the associated front frame part is made of high-grade CrNi steel. This multi-part design of the washing container, consisting of the container shell and the front frame part, in which the sealing bed is integrated, is technically complex. In addition, the production of the washing container for the front frame part still requires the use of expensive stainless steel to ensure corrosion resistance in the sealing bed of the door seal.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zur Herstellung einer Geschirrspülmaschine sowie eine Geschirrspülmaschine bereitzustellen, durch welche fertigungstechnisch einfach sowie mit reduzierten Material- und Fertigungskosten eine Korrosionsbeständigkeit in dem Bereich des Dichtbetts der Türdichtung für die Gerätetür einer Geschirrspülmaschine, insbesondere einer Haushaltsgeschirrspülmaschine, erreicht wird.The object of the invention is to provide a method for producing a dishwasher and a dishwasher, by which manufacturing technology easily and with reduced material and manufacturing costs corrosion resistance in the region of the sealing bed of the door seal for the door of a dishwasher, especially a domestic dishwasher is achieved ,

Erfindungsgemäß ist vorgesehen, dass als Flüssiglack ein Acrylharzlack verwendet wird, dass der Acrylharzlack unter Ausnutzung von Kapillarkräften in die Verbindungsfuge oder in den Kapillarspalt eingebracht wird und dass der Acrylharzlack in der Verbindungsfuge oder in dem Kapillarspalt ausgehärtet wird.According to the invention, it is provided that an acrylic resin lacquer is used as the liquid lacquer, that the acrylic resin lacquer is applied by utilizing capillary forces in the connecting joint or in the capillary gap and that the acrylic resin lacquer is cured in the connecting joint or in the capillary gap.

Durch das erfindungsgemäße Verfahren lässt sich eine Korrosionsbeständigkeit in dem Bereich des Dichtbetts der Türdichtung für die Gerätetür einer Geschirrspülmaschine, insbesondere einer Haushaltsgeschirrspülmaschine, fertigungstechnisch einfach sowie mit reduzierten Material- und Fertigungskosten erreichen.By means of the method according to the invention, a corrosion resistance in the region of the sealing bed of the door seal for the appliance door of a dishwashing machine, in particular a domestic dishwasher, can be achieved in a simple manufacturing process and with reduced material and production costs.

Es werden bevorzugt in einem Formgebungsschritt zumindest Teilbereiche des Dichtbetts, insbesondere zusammen mit zumindest einer Behälterwand des Spülbehälters, aus einer Mantelplatine geformt. Dadurch kann die Fertigung der Geschirrspülmaschine aufgrund einer Reduzierung der Fertigungsschritte vereinfacht werden.In a shaping step, at least partial regions of the sealing bed, in particular together with at least one container wall of the washing container, are preferably formed from a jacket plate. As a result, the production of the dishwasher can be simplified due to a reduction of the manufacturing steps.

Die Aushärtung kann beispielsweise durch Infrarottrocknung mittels eines Infrarotstrahlers erfolgen. Für den gewünschten Korrosionsschutz ist es ausreichend, die mit dem Türdichtungselement in Kontakt befindliche und damit gegenüber Spaltkorrosion besonders anfällige Oberfläche des Dichtbetts mit Acrylharzlack zu behandeln.The curing can be done for example by infrared drying using an infrared radiator. For the desired corrosion protection, it is sufficient to treat the surface of the sealing bed which is in contact with the door-sealing element and thus particularly susceptible to crevice corrosion with acrylic resin paint.

Auf diese Weise kann bei der Herstellung des Dichtbetts auf den Einsatz von kostspieligem CrNi-Stahl gänzlich verzichtet werden und anstelle dessen ein kostengünstiger, jedoch korrosionsanfälliger Cr-Stahl verwendet werden. Vorzugsweise wird ausnahmslos nur der Oberflächenbereich des Dichtbetts mit dem Acrylharzlack versehen, bei dem es tatsächlich zu einer Spaltkorrosion kommen kann. Die anderen Stahlblech-Bereiche des Dichtbetts verbleiben demgegenüber ohne die erfindungsgemäße Oberflächenbehandlung.In this way, in the production of the sealing bed on the use of expensive stainless steel can be completely dispensed with and instead a cost-effective, but susceptible to corrosion Cr steel can be used. Without exception, only the surface region of the sealing bed is preferably provided with the acrylic resin lacquer, in which crevice corrosion can actually occur. In contrast, the other steel sheet areas of the sealing bed remain without the surface treatment according to the invention.

Wie oben angegeben, ist es nicht mehr erforderlich, das Dichtbett aus kostspieligem, korrosionsfestem CrNi-Stahlblech herzustellen. Das Dichtbett kann daher im Unterschied zum oben angegebenen Stand der Technik materialeinheitlich und/oder einstückig mit dem Behältermantel des Spülbehälters ausgebildet werden, wobei zur Bildung dieser Bauteileinheit der Einsatz von kostengünstigem Cr-Stahl ausreichend ist. Entsprechend kann bei der Herstellung des Spülbehälters gänzlich auf den Einsatz von CrNi-Stahl verzichtet werden.As stated above, it is no longer necessary to produce the sealing bed from costly, corrosion-resistant CrNi steel sheet. The sealing bed can therefore be formed of the same material and / or in one piece with the container shell of the washing, in contrast to the above-mentioned prior art, wherein the formation of this component unit, the use of inexpensive Cr-steel is sufficient. Corresponding can be completely dispensed with the use of CrNi steel in the manufacture of the washing.

Dabei kann bereits durch das Auftragen einer Flüssiglackschicht aus Acrylharz mit einer Materialstärke in einem Bereich von 1 bis 5 µm, insbesondere in einem Bereich von 2 bis 3 µm, ein ausreichender Korrosionsschutz erreicht werden. Entsprechend gering ist der erforderliche Materialeinsatz, um den notwendigen Korrosionsschutz in dem Bereich des Dichtbetts der Türdichtung für die Gerätetür einer Geschirrspülmaschine, insbesondere einer Haushaltsgeschirrspülmaschine, zu erreichen.In this case, by applying a liquid paint layer of acrylic resin with a material thickness in a range of 1 to 5 microns, in particular in a range of 2 to 3 microns, sufficient corrosion protection can be achieved. The required material usage is correspondingly low in order to achieve the necessary corrosion protection in the region of the sealing bed of the door seal for the appliance door of a dishwasher, in particular a domestic dishwasher.

Der Dichtgrund und eine in Geräteseitenrichtung äußere Nutwand des Dichtbetts kann als eine nach außen abgestufte Ausprägung unmittelbar in dem Behältermantel des Spülbehälters ausgebildet werden. Die innere Nutwand des Dichtbetts kann demgegenüber durch eine separate Blechleiste ausgebildet sein, die mit dem Behältermantel des Spülbehälters verschweißt ist. Bei einer solchen Konstruktion ergibt sich daher zwischen dem Dichtgrund und der, durch die Blechleiste gebildeten inneren Nutwand eine Verbindungsfuge oder ein Kapillarspalt, in dem sich nachteilig Feuchtigkeit sammeln kann. Um hier die Gefahr von Spaltkorrosion zu vermeiden, kann die Korrosionsschutzschicht insbesondere die in den Dichtbett-Innenraum offene Verbindungsfuge überdecken.The sealing base and an outer side of the groove wall of the sealing bed in the device side direction can be formed as an outwardly graded expression directly in the container shell of the washing. The inner groove wall of the sealing bed may in contrast be formed by a separate sheet metal strip, which is welded to the container casing of the washing. In such a construction, therefore, results between the sealing base and, formed by the metal strip inner groove wall a connecting joint or a capillary gap, in which moisture can collect disadvantageously. In order to avoid the risk of crevice corrosion here, the corrosion protection layer can cover in particular the open in the sealing bed interior joint.

Als Kapillarspalt im Sinne der Erfindung ist ein Spalt zwischen den Blechteilenden mit sehr geringer Spaltbreite zu verstehen. Durch die im Vergleich zu größeren Spaltbreiten stark im Vordergrund tretenden Oberflächeneffekte tritt in dem Kapillarspalt verstärkt die Kapillarität auf, bei der der Flüssiglack aufgrund seiner Oberflächenspannung sich in dem Kapillarspalt quasi verstemmt und nicht mehr herausfließen kann bis die Aushärtung abgeschlossen ist.As a capillary gap in the context of the invention, a gap between the sheet metal part ends is to be understood with very small gap width. Due to the surface effects, which are very prominent in comparison to larger gap widths, the capillarity increasingly occurs in the capillary gap, in which the liquid lacquer, due to its surface tension, becomes caulked in the capillary gap and can no longer flow out until the curing is complete.

Die Korrosionsschutzschicht kann, wie bereits oben erwähnt, bevorzugt in flüssiger Form als ein Speziallack in dem Dichtbett appliziert werden. Der noch flüssige Speziallack kann dabei ohne weiteres durch Kapillarwirkung in die oben erwähnte Verbindungsfuge zwischen der Blechleiste und dem Behältermantel einfließen. Dadurch ist gewährleistet, dass der Dichtbettraum korrosionsfest versiegelt ist.The corrosion protection layer can, as already mentioned above, preferably be applied in liquid form as a special lacquer in the sealing bed. The still liquid special coating can easily be incorporated by capillary action in the above-mentioned joint between the metal strip and the container shell. This ensures that the dense bed room is sealed corrosion-resistant.

In dem obigen Fall erfolgt das Applizieren der Korrosionsschutzschicht nach dem Zusammenbau beziehungsweise der Formgebung des Dichtbetts. Die Korrosionsschutzschicht kann in diesem Fall bevorzugt mittels einer Sprüheinrichtung zunächst in flüssiger Form in das Dichtbett eingebracht werden. Hierbei ist ein lagerichtiges Aufbringen der Korrosionsschutzschicht innerhalb des Dichtbetts von großer Bedeutung, um optisch nachteilhafte Spuren des Speziallacks außerhalb des Dichtbetts zu vermeiden. Vor diesem Hintergrund eignet sich insbesondere eine sogenannte Signiersprüheinrichtung, die den Speziallack vernebelungsfrei in das Dichtbett einsprühen kann. Zusätzliche Abdeckmaßnahmen außerhalb des Dichtbetts sind daher nicht erforderlich. Das Einbringen des Speziallacks erfolgt bevorzugt durch eine robotergeführte Signiersprühpistole. Anschließend wird der aufgebrachte Speziallack durch Infrarottrocknung getrocknet.In the above case, the application of the anticorrosive layer takes place after assembly or molding of the sealing bed. In this case, the anticorrosive layer can preferably be introduced first into the sealing bed in liquid form by means of a spraying device. Here, a correct position applying the corrosion protection layer within the sealing bed is of great importance in order to avoid optically disadvantageous traces of the special paint outside of the sealing bed. Against this background, in particular, a so-called signature spray device which can spray the special paint into the sealing bed without fogging is suitable. Additional covering measures outside of the sealing bed are therefore not required. The introduction of the special lacquer is preferably carried out by a robot-controlled marking spray gun. Subsequently, the applied special lacquer is dried by infrared drying.

Alternativ dazu kann die Korrosionsschutzschicht auch bereits vor dem Zusammenbau beziehungsweise der Formgebung des Dichtbetts beziehungsweise des Spülbehälters bereits auf die noch ebenflächige Mantelplatine aufgebracht werden. Für ein lagerichtiges Aufbringen der Korrosionsschutzschicht eignet sich insbesondere ein Siebdruckverfahren oder ebenfalls ein Signiersprühverfahren. Der in einem zusammengebauten beziehungsweise geformten Zustand das Dichtbett innenseitig begrenzende Blechstreifen kann hierbei zumindest in Teilbereichen mit der Korrosionsschutzschicht versehen werden.As an alternative to this, the anticorrosive layer can also already be applied to the still planar jacket plate before the assembly or the shaping of the sealing bed or the rinsing container. For a correct position application of the corrosion protection layer is particularly suitable a screen printing process or also a Signiersprühverfahren. The sheet metal strip which delimits the sealing bed on the inside in an assembled or formed state can hereby be provided with the corrosion protection layer at least in some areas.

Nachfolgend ist ein Ausführungsbeispiel der Erfindung anhand der beigefügten Figuren beschrieben.Hereinafter, an embodiment of the invention with reference to the accompanying figures will be described.

Es zeigen:

Fig. 1
in einer vergrößerten Schnittdarstellung den Türdichtungsbereich einer Geschirrspülmaschine;
Fig. 2
eine Ansicht entsprechend der Fig. 1, anhand der ein Verfahren zur Aufbringung der Korrosionsschutzschicht veranschaulicht ist; und
Fig. 3
einen Ausschnitt aus einer Mantelplatine sowie einer zugeordneten Blechleiste, auf der vor einer Formgebung auf den, das Dichtbett bildenden Bereich eine Korrosionsschutzschicht aufgetragen ist.
Show it:
Fig. 1
in an enlarged sectional view of the door seal region of a dishwasher;
Fig. 2
a view corresponding to the Fig. 1 , which illustrates a method of applying the anticorrosion layer; and
Fig. 3
a detail of a jacket plate and an associated metal strip on which a corrosion protection layer is applied to the forming the sealing bed area before shaping a.

In der Fig. 1 ist ein frontseitiger Türdichtungsbereich einer in dem vorliegenden Ausführungsbeispiel als Haushaltsgeschirrspülmaschine ausgebildeten Geschirrspülmaschine gezeigt. Die Geschirrspülmaschine weist einen Spülbehälter 1 auf, der aus einer in der Fig. 3 beispielhaft gezeigten ebenflächigen Mantelplatine 3 hergestellt ist. Die Mantelplatine 3 wird in einem Biegeprozess so geformt, dass ein kastenförmiger Behältermantel, bestehend aus einer Bodenwand, einer Deckwand und zwei Seitenwänden, entsteht.In the Fig. 1 is shown a front-side door sealing region of a dishwasher designed in the present embodiment as a household dishwasher. The dishwasher has a washing container 1, which consists of a in the Fig. 3 Example shown planar cover plate 3 is made. The jacket plate 3 is formed in a bending process so that a box-shaped container shell, consisting of a bottom wall, a top wall and two side walls arises.

Die Rückseite des Behältermantels wird in dem vorliegenden Ausführungsbeispiel durch ein als Rückwand dienendes Blechteil verschlossen. Die Vorderseite des Behältermantels bildet demgegenüber eine Beschickungsöffnung 5, die in bekannter Weise von einem gummiartigen Türdichtungselement 7 umzogen ist. Das Türdichtungselement 7 ist in Fig. 1 gepunktet in einem unverformten Zustand dargestellt. In der Fig. 1 ist die frontseitige Blechteilgeometrie einer seitlichen Behälterwand 9 des Spülbehälters 1 gezeigt, die ein nutförmiges Dichtbett 6 aufweist, in welches das Türdichtungselement 7 eingesetzt ist.The rear side of the container jacket is closed in the present embodiment by a sheet metal part serving as a rear wall. In contrast, the front side of the container casing forms a feed opening 5, which in a known manner is surrounded by a rubber-like door seal element 7. The door seal member 7 is in Fig. 1 shown dotted in an undeformed state. In the Fig. 1 the front sheet metal part geometry of a lateral container wall 9 of the washing compartment 1 is shown, which has a groove-shaped sealing bed 6 into which the door sealing element 7 is inserted.

Zur Bildung des Dichtbetts 6 weist die Behälterwand 9 zur Frontseite hin eine in der Geräteseitenrichtung x nach außen abgestufte Ausprägung aus. Diese bildet einen um eine Biegekante 11 nach außen abgewinkelten Dichtgrund 13 des Dichtbetts 6, der über eine weitere äußere Biegekante 15 in eine äußere, zur Behälterwand 9 parallelen Nutwand 17 des Dichtbetts 6 übergeht. Die äußere Nutwand 17 ist zur Frontseite hin bis zu einem nach außen abgewinkelten Frontflansch 19 verlängert.To form the sealing bed 6, the container wall 9 to the front side out in the device side direction x stepped outward expression. The latter forms a sealing base 13 of the sealing bed 6 that is angled outward about a bending edge 11 and that merges via a further outer bending edge 15 into an outer groove wall 17 of the sealing bed 6 that is parallel to the container wall 9. The outer groove wall 17 is extended to the front side up to an outwardly angled front flange 19.

Die in der Gehäuseseitenrichtung x innere Nutwand 21 wird durch eine separate Blechleiste 22 gebildet, die mittels Punktschweißung an der Innenseite der Behälterwand 9 festgelegt ist. In dem so gebildeten nutförmigen Dichtbett 6 ist die Türdichtung 7 eingesetzt, die bei geschlossener Geschirrspülmaschine in Dichtkontakt mit der gestrichelt angedeuteten Innentür 23 einer Gerätetür ist. Der Behältermantel des Spülbehälters 1 ist außerdem in an sich bekannter Seite frontseitig an einem umlaufenden Frontrahmen 25 befestigt.The groove side 21 inner groove wall 21 in the housing side direction is formed by a separate sheet metal strip 22, which is fixed to the inside of the container wall 9 by spot welding. In the thus formed groove-shaped sealing bed 6, the door seal 7 is used, which is in the closed dishwasher in sealing contact with the dashed lines indicated inner door 23 of a door. The container casing of the washing compartment 1 is also fastened on the front side on a circumferential front frame 25 in a known side.

In dem, in der Fig. 1 gezeigten Ausführungsbeispiel ist sowohl der Spülbehälter 1 als auch die daran materialeinheitlich und einstückig angeformte stufenförmige Ausprägung aus einem korrosionsanfälligen, jedoch kostengünstigeren Cr-Stahlblech hergestellt. Um innerhalb des Dichtbetts 6 die Gefahr von Spaltkorrosion zu vermeiden, weist das Dichtbett 6 an seiner, der Türdichtung 7 zugewandten Oberfläche eine Korrosionsschutzschicht aus Acrylharzlack 27 auf, die als ein Flüssiglack mit geringer Materialstärke in einem Bereich von 2 bis 3 µm aufgetragen ist.In that, in the Fig. 1 In the embodiment shown, both the rinsing container 1 and the step-shaped form integrally formed thereon in one piece and in one piece are made of a corrosion-susceptible, but less expensive Cr sheet steel. Around Within the sealing bed 6 to avoid the risk of crevice corrosion, the sealing bed 6 on its, the door seal 7 facing surface on a corrosion protection layer of acrylic resin lacquer 27, which is applied as a liquid paint with low material thickness in a range of 2 to 3 microns.

Die Korrosionsschutzschicht aus Acrylharzlack 27 ist in der Fig. 1 mit übertrieben großer Materialstärke dargestellt. Demzufolge überdeckt die Korrosionsschutzschicht aus Acrylharzlack 27 sowohl die seitlichen Nutwände 17, 21 als auch den Dichtgrund 13. Wie aus der Fig.1 weiter hervorgeht, ist auch die besonders korrosionsanfällige Verbindungsfuge 29 zwischen dem Dichtgrund 13 und der dazu rechtwinklig ausgerichteten inneren Nutwand 21 ebenfalls von der Korrosionsschutzschicht aus Acrylharzlack 27 überdeckt.The corrosion protection layer of acrylic resin paint 27 is in the Fig. 1 shown with exaggerated material thickness. Accordingly, the corrosion protection layer of acrylic resin paint 27 covers both the lateral groove walls 17, 21 and the sealing base 13. As shown in Fig.1 Furthermore, the particularly corrosion-prone joint 29 between the sealing base 13 and the inner groove wall 21 oriented at right angles thereto is also covered by the corrosion protection layer of acrylic resin lacquer 27.

Die erfindungsgemäße Korrosionsschutzschicht aus Acrylharzlack 27 kann in unterschiedlicher Weise in das Dichtbett 6 eingebracht werden. Gemäß der Fig. 2 erfolgt das Applizieren der Korrosionsschutzschicht aus Acrylharzlack 27 nach der Fertigstellung des Spülbehälters 1 und des Dichtbetts 6. Dabei wird eine robotergeführte Signiersprühpistole 31 mit ihrer Eintragsdüse in das Dichtbett 6 eingefahren und der Acrylharzlack 27 aufgetragen. Der Acrylharzlack 27 wird darauffolgend in einem Aushärteschritt getrocknet und damit ausgehärtet.The corrosion protection layer of acrylic resin lacquer 27 according to the invention can be introduced into the sealing bed 6 in different ways. According to the Fig. 2 the application of the corrosion protection layer of acrylic resin lacquer 27 takes place after the completion of the washing container 1 and the sealing bed 6. A robot-controlled signing spray gun 31 with its picking nozzle is moved into the sealing bed 6 and the acrylic resin lacquer 27 is applied. The acrylic resin paint 27 is subsequently dried in a curing step and cured.

Anhand der Fig. 3 ist eine weitere Variante zum Aufbringen der Korrosionsschutzschicht aus Acrylharzlack 27 gezeigt, die im Unterschied zur Fig. 2 bereits vor einer Formgebung des Spülbehälters 1 und damit des Dichtbetts 6 auf die noch ebenflächige Mantelplatine 3 aufgetragen wird. Das Aufbringen der mit Kreuzschraffur dargestellten Korrosionsschutzschicht aus Acrylharzlack 27 erfolgt dabei gemäß der Fig. 3 ausschließlich in dem, das Dichtbett 6 bildenden Bereich der Mantelplatine 3. Die in der Fig. 3 noch als separates Bauteil vorgehaltene Blechleiste 22, welche in einem geformten und zusammengebauten Zustand auch die innere Nutwand 21 bildet, wird an ihrer, in Zusammenbaulage der Türdichtung 7 zugewandten Oberfläche ebenfalls mit der Korrosionsschutzschicht aus Acrylharzlack 27 versehen. Erst nach Aufbringen der Korrosionsschutzschicht aus Acrylharzlack 27 wird der Biege- und Fügeprozess zur Herstellung des Spülbehälters 1 und damit auch des Dichtbetts 6 gestartet, bei dem zunächst die Mantelplatine 3 um die gestrichelt angedeuteten Biegeachsen zu einem Behältermantel gebogen wird und anschließend die stufenförmige Ausprägung in die Vorderseite des Behältermantels eingeformt wird.Based on Fig. 3 a further variant for applying the corrosion protection layer of acrylic resin lacquer 27 is shown, in contrast to Fig. 2 is already applied to the still planar jacket 3 prior to a shaping of the washing compartment 1 and thus the sealing bed 6. The application of the cross-hatched corrosion protection layer of acrylic resin lacquer 27 is carried out according to the Fig. 3 only in that, the sealing bed 6 forming region of the jacket plate 3. The in the Fig. 3 still held as a separate component sheet metal strip 22, which also forms the inner groove wall 21 in a molded and assembled state, is also provided on its, in assembly position of the door seal 7 facing surface with the corrosion protection layer of acrylic resin paint 27. Only after application of the corrosion protection layer of acrylic resin lacquer 27 of the bending and joining process for producing the washing compartment 1 and thus also the sealing bed 6 is started, in which first the jacket plate 3 to the bending axes indicated by dashed lines to a Container shell is bent and then the step-shaped expression is formed in the front of the container shell.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Spülbehälterrinse tank
33
MantelplatineCoat board
55
Beschickungsöffnungloading port
66
DichtbettDensity bed
77
TürdichtungselementDoor seal element
99
Behälterwandcontainer wall
1111
Biegekantebending edge
1313
Dichtgrundsealing base
1515
Biegekantebending edge
1717
Äußere NutwandOuter groove wall
1919
Frontflanschfront flange
2121
Innere NutwandInner groove wall
2222
Blechleistesheet bar
2323
Innentürinterior door
2525
Frontrahmenfront frame
2727
Flüssiglack; AcrylharzlackLiquid paint; Acrylic resin varnish
2929
Verbindungsfuge beziehungsweise KapillarspaltConnecting joint or capillary gap
3131
SigniersprühpistoleSigniersprühpistole
xx
GeräteseitenrichtungDevice side direction
yy
BautiefenrichtungBautiefenrichtung

Claims (7)

  1. Method for manufacturing a dishwasher, in particular a household dishwasher, with a door sealing element (7) at least partially surrounding a loading opening (5) of the dishwasher which can be closed by an appliance door (23), which door sealing element (7) is inserted into a sealing bed (6) embodied in a groove-shaped manner with two side walls (17, 21) and a sealing base (13), and for the formation of said sealing bed a sheet metal strip (22) is connected to a container wall (9) of a washing container by forming a connecting joint or a capillary gap (29), wherein in an application step prior to inserting the door sealing element (7) a liquid lacquer (28) is applied as a corrosion protection layer at least on the surface of the sealing base (13) of the sealing bed (6) facing the door sealing element (7), and wherein in a curing step the liquid lacquer (27) is cured, characterised in that an acrylic resin lacquer (27) is used as the liquid lacquer (27), that the acrylic resin lacquer (27) is introduced into the connecting joint or into the capillary gap (29) using capillary forces and that the acrylic resin lacquer (27) is cured in the connecting joint or in the capillary gap (29).
  2. Method according to claim 1, characterised in that in a moulding step at least subareas of the sealing bed (6), in particular together with at least one container wall (9) of the washing container, are moulded from a casing plate (3).
  3. Method according to claim 1 or 2, characterised in that the groove-shaped sealing bed (6) embodied with two side walls (17, 21) and a sealing base (13) is manufactured at least partially, in particular completely, from a Cr steel sheet.
  4. Method according to one of the preceding claims, characterised in that the acrylic resin lacquer (27) is applied with a material strength in a range of 1 to 5 µm, in particular in a range of 2 to 3 µm.
  5. Method according to one of the preceding claims, characterised in that the sealing base (13) of the sealing bed (6) and, in the appliance side direction (x), an outer groove wall (17) of the sealing bed (6) is embodied as an outwardly stepped shape in the container wall (9) and that an inner groove wall (21) of the sealing bed (6) is formed by the separate sheet metal strip (22) connected to the container wall (9).
  6. Method according to one of the preceding claims, characterised in that in terms of time the application step and the curing step for applying and curing the acrylic resin lacquer (27) take place before the moulding step, wherein the acrylic resin lacquer (27) is applied at least to a subarea of an area of the casing plate (3) forming the sealing bed (6).
  7. Dishwasher, in particular manufactured according to a method according to one of the preceding claims, with a loading opening (5) which can be closed by an appliance door (23), which is surrounded at least partially by a door sealing element (7), which is inserted into a sealing bed (6) embodied in a groove-shaped manner with two side walls (17, 21) and a sealing base (13), and for the formation of said sealing bed a sheet metal strip (22) is connected to a container wall (9) of a washing container by forming a connecting joint or a capillary gap (29), wherein a cured liquid lacquer (27) is applied to the side of the sealing base (13) of the sealing bed (6) facing the door sealing element (7) as a corrosion protection layer and is cured, characterised in that the liquid lacquer which is introduced and hardened in the connecting joint or in the capillary gap (29) by utilising capillary forces is an acrylic resin lacquer (27).
EP12152276.7A 2011-02-08 2012-01-24 Method for manufacturing a dishwasher and dishwasher Active EP2484265B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110003789 DE102011003789A1 (en) 2011-02-08 2011-02-08 Process for the production of a dishwasher and dishwashing machine

Publications (3)

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EP2484265A2 EP2484265A2 (en) 2012-08-08
EP2484265A3 EP2484265A3 (en) 2013-08-07
EP2484265B1 true EP2484265B1 (en) 2019-04-10

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EP (1) EP2484265B1 (en)
DE (1) DE102011003789A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011004056A1 (en) * 2011-02-14 2012-08-16 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher and method for producing a washing container of a dishwasher
DE102017215754A1 (en) * 2017-09-07 2019-03-07 Robert Bosch Gmbh Tank with an inner container and an outer shell and method of manufacturing the tank
FR3075585B1 (en) * 2017-12-21 2021-10-01 Groupe Brandt DISHWASHER WITH SEAL BETWEEN THE WASHING TANK AND THE FRONT DOOR

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Publication number Priority date Publication date Assignee Title
DE4303570C2 (en) * 1993-02-08 1997-03-20 Fraunhofer Ges Forschung Process for the production of functional coatings, coated substrates and coating material
DE10156422B4 (en) * 2001-11-16 2004-01-08 BSH Bosch und Siemens Hausgeräte GmbH Process for sealing sealing channels
DE102005062478A1 (en) 2005-12-27 2007-07-05 BSH Bosch und Siemens Hausgeräte GmbH Dishwasher used in the household comprises a frame part made from a corrosion-resistant steel formed on the front end of a container hood

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* Cited by examiner, † Cited by third party
Title
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EP2484265A3 (en) 2013-08-07
EP2484265A2 (en) 2012-08-08

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