EP3586713B1 - Bras pulvérisateur pour un lave-vaisselle - Google Patents

Bras pulvérisateur pour un lave-vaisselle Download PDF

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Publication number
EP3586713B1
EP3586713B1 EP19172707.2A EP19172707A EP3586713B1 EP 3586713 B1 EP3586713 B1 EP 3586713B1 EP 19172707 A EP19172707 A EP 19172707A EP 3586713 B1 EP3586713 B1 EP 3586713B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
flow
opening
spray arm
cross
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
EP19172707.2A
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German (de)
English (en)
Other versions
EP3586713A1 (fr
Inventor
Benjamin STANKE
Stefan Havermann
Walter Assmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3586713A1 publication Critical patent/EP3586713A1/fr
Application granted granted Critical
Publication of EP3586713B1 publication Critical patent/EP3586713B1/fr
Active legal-status Critical Current
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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
    • A47L15/42—Details
    • A47L15/4278—Nozzles

Definitions

  • the invention relates to a spray arm for a dishwasher, with a base body that is at least partially made of plastic and a nozzle that is designed as an integral part of the base body in one piece with it. Furthermore, the invention relates to a dishwasher equipped with a spray arm.
  • Dishwashers as such and spray arms for dishwashers are well known per se from the prior art, which is why separate printed evidence is not required at this point.
  • Dishwashers of a previously known design have a washing compartment that provides a washing space.
  • This rinsing chamber is accessible to the user via a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted rinsing chamber door.
  • the washing compartment serves to accommodate items to be cleaned, which in the case of a household dishwasher can be, in particular, crockery, cutlery and/or the like.
  • the dishwasher In order to apply washing liquid, the so-called washing liquor, to items to be washed that are to be cleaned, the dishwasher has a spray device configured on the washing chamber side.
  • this spray device provides rotatably mounted spray arms, with typically two or three such spray arms being provided.
  • the dishes to be cleaned are subjected to washing liquor by means of rotating spray arms.
  • a circulating pump is provided which is fluidically connected on the one hand to a collection pot into which the washing container opens out and on the other hand to the spray arms.
  • the washing liquor released by the spray device collects in the collection pot.
  • the circulating pump conveys the washing liquor accumulating in the collection pot to the spray arms of the spray device, from where the washing liquor is then discharged in the direction of the items to be washed takes place.
  • a spray arm typically has a base body that is at least partially made of plastic.
  • the base body is designed in two parts and has an upper shell on the one hand and a lower shell arranged thereon on the other hand. Both the upper shell and the lower shell can be made of plastic.
  • the upper shell and the lower shell are connected to one another, for example glued or welded to one another, forming a volume space.
  • the spray arm provides at least one nozzle, preferably several nozzles, through which washing liquor is dispensed in the intended use case.
  • the nozzles are designed as an integral part of the base body in one piece with it. In the simplest case, the nozzles are formed by respective recesses in the upper shell of the base body, with the volume space provided by the base body flowing into the nozzles in terms of flow.
  • the DE 1628813 A1 discloses a washing jet nozzle made of plastic that can be attached to a connecting pipe, in which a first area is shaped as a contraction hollow truncated cone and a second area adjoining it as an expansion hollow truncated cone.
  • the DE 10 2010 043 019 A1 discloses a spray arm for a dishwasher with a base body that has an upper shell and a lower shell arranged thereon, the upper shell and lower shell being made of plastic.
  • a plurality of nozzle bodies are integrated into the upper shell, these being designed as separate components and protruding from the upper shell.
  • the DE1428349 A1 discloses a spray arm for a dishwasher with a base body which has an upper tube half and a lower tube half arranged thereon, it being possible for the tube halves to be made of plastic. Slot-shaped nozzles are provided in the upper half of the pipe in protruding thickenings.
  • nozzles in the shape of a funnel or cone have proven particularly effective. Because the cone shape has two main advantages. For one, the nozzle be inclined in their vertical alignment to the horizontal, without having to change the demoulding direction of the tool provided for injection molding the upper shell. On the other hand, the conical shape of the nozzle leads to a constriction of the water jet formed by the nozzle when used as intended. This in turn means that the hydraulic diameter of the water jet is smaller than the geometric diameter of the nozzle outlet opening, which has the advantage that the nozzle has an overall reduced tendency to clog.
  • the invention proposes a spray arm for a dishwasher with the features of claim 1.
  • the nozzle according to the configuration according to the invention has a nozzle chamber which is known per se from the prior art.
  • a through-flow space is also provided, which fluidically connects to the nozzle space in the through-flow direction of the nozzle.
  • a fluid flowing through the nozzle when used as intended therefore first reaches the nozzle chamber on the inlet side, from where it reaches the through-flow chamber adjoining the nozzle chamber. This provides an outlet opening on the nozzle outlet side, through which the fluid leaves the nozzle.
  • the through-flow space is directly connected to the nozzle space with a through-flow opening arranged in between.
  • the outlet opening of the nozzle chamber and the inlet opening of the through-flow chamber therefore coincide and form the through-flow opening.
  • the configuration according to the invention has the advantage that the nozzle outlet is offset to the rear due to the fluidic downstream connection of the through-flow space.
  • the tear-off edge for the fluid flowing through the nozzle on the outlet side of the nozzle chamber and the nozzle outlet opening provided by the base body on the outlet side of the through-flow chamber thus fall apart spatially.
  • any degree of spraying that cannot be avoided due to production is formed at the nozzle outlet opening that delimits the contour of the base body, but not at the tear-off edge that is spaced apart from it and defined by the through-flow opening.
  • the configuration according to the invention brings with it a further advantage.
  • the flow opening spaced apart from the spatial closing edge of the base body or the tear-off edge defined here can be designed correspondingly inclined, which, in contrast to the prior art, does not require an enlarged nozzle space and therefore no increased installation space.
  • the discharge of a fluid jet inclined to the horizontal results solely from the spatial separation according to the invention of the nozzle outlet opening on the one hand and the through-flow opening on the other hand, the through-flow opening being inclined to the horizontal, the surface normals of the cross-sectional areas of the nozzle outlet opening on the one hand and the through-flow opening on the other hand being aligned transversely to one another.
  • a through-flow chamber is downstream of the actual nozzle chamber in terms of flow, with the nozzle chamber providing the nozzle inlet opening on the inlet side and the through-flow chamber on the nozzle outlet side providing the nozzle outlet opening.
  • the nozzle space and the through-flow space are formed directly adjacent to one another with the interposition of a through-flow opening, which through-flow opening defines the tear-off edge for a fluid flowing through the nozzle.
  • This tear-off edge defined by the through-flow opening can also be aligned at an incline to the horizontal, which, when used as intended, results in a jet formation that is inclined to the vertical.
  • the nozzle has a nozzle inlet opening on the inlet side, the cross section of the nozzle inlet opening being larger than the cross section of the flow opening.
  • the nozzle has a nozzle outlet opening on the outlet side, the cross section of the nozzle outlet opening being smaller than the cross section of the flow opening or equal to the cross section of the flow opening.
  • the delimitation of the through-flow opening forms, in the manner already described above, the tear-off edge for the fluid flowing through the nozzle in the intended use case.
  • the cross section of the nozzle outlet opening on the outlet side and the cross section of the through-flow opening are of the same size. In this case, a jet straight in the vertical direction is discharged from the nozzle.
  • the through-flow opening is designed to be inclined to the horizontal.
  • the cross section of the nozzle outlet opening is smaller than the cross section of the flow opening.
  • the cross-section of the nozzle inlet opening and the cross-section of the nozzle outlet opening are aligned plane-parallel to one another.
  • the nozzle space is funnel-shaped or conical in the flow direction.
  • the through-flow opening delimiting the funnel or cone shape can be aligned either plane-parallel to the cross-sections of the nozzle inlet opening or the nozzle outlet opening or inclined thereto, in accordance with the above statements.
  • the through-flow space is designed in the shape of a circular cone in the through-flow direction.
  • a guide that widens in the direction of the nozzle outlet opening can also be provided.
  • the through-flow opening is designed without burrs, which is achieved according to the invention in that the nozzle outlet opening and the through-flow opening are spatially separated from one another by the through-flow space adjoining the nozzle space in terms of flow.
  • the surface normals of the cross-sectional surfaces of the nozzle inlet opening and the nozzle outlet opening run parallel to one another.
  • the base body providing the nozzle preferably an upper shell of the base body, provides a recess forming the nozzle, with the nozzle inlet opening and the nozzle outlet opening coinciding with the body edge of the base body or the upper shell. Accordingly, the nozzle inlet opening and the nozzle outlet opening are aligned plane-parallel to one another, and consequently also the surface normals of the respective cross-sectional areas of the nozzle outlet opening and nozzle inlet opening.
  • the surface normals of the cross-sectional areas of the flow opening and the nozzle inlet or nozzle outlet opening are aligned parallel to one another.
  • a nozzle jet is formed which is aligned parallel to the vertical, ie a jet which is aligned at right angles to the base body.
  • the surface normals of the cross-sectional areas of the flow opening and the nozzle outlet opening run transversely to one another.
  • the through-flow opening is oriented inclined to the horizontal or to the vertical, which, when used as intended, results in the fluid guided through the nozzle forming a jet that is inclined to the vertical.
  • the base body has an upper shell and a lower shell arranged thereon, the upper shell being made of plastic and providing a plurality of nozzles.
  • the lower shell can also be made of plastic.
  • the upper shell and the lower shell can be glued and/or welded to one another.
  • the lower shell can be made of a different material, for example metal.
  • the nozzles can preferably be designed differently with regard to the inclination of the flow opening provided in each case.
  • the nozzle-side outer surface of the upper shell or the base body is flat. Accordingly, the nozzles do not protrude in sections from the outer surface of the base body and there are also no surface depressions in the area of a nozzle, which is particularly advantageous for reasons of improved visual impression.
  • the flow space provided according to the invention which adjoins the nozzle space in the flow direction of a fluid passing through the nozzle, has an extension in the height direction of preferably 0.1 mm to 1.0 mm. Accordingly, the through-flow opening is offset downwards by 0.1 mm to 1.0 mm in the height direction, starting from the outer surface of the upper shell.
  • the through-flow opening defines the tear-off edge for a fluid passing through the nozzle, so that the tear-off edge for the fluid and the actual nozzle outlet opening are spatially separated from one another.
  • the through-flow opening is spaced from the nozzle outlet opening by 0.1 mm to 1.0 mm preferred.
  • the invention also proposes a dishwasher, in particular a domestic dishwasher, with a washing compartment that provides a washing compartment and is used to hold items to be cleaned, the washing compartment having a loading opening for loading items to be washed, which can be closed in a fluid-tight manner by means of a pivoted washing compartment door , and with a spray device for applying washing liquor to items to be cleaned, the spray device having a spray arm of the type described above.
  • a dishwasher designed in accordance with the invention provides the advantages already explained above.
  • the tool-side closing edge on the one hand and the nozzle tear-off edge on the other.
  • This separation of the closing edge and the tear-off edge prevents the tear-off edge from having a spray burr due to production, which would result in a spray jet that does not taper in an undesired manner.
  • the result is that the hydraulic cross-section of the discharged jet is larger than it should be in the event that the tear-off edge and the edge of the body collide.
  • jet direction can be adjusted by providing a tear-off edge that is not aligned plane-parallel to the edge of the body.
  • the configuration according to the invention also has the advantage that, for design reasons, an even, i.e. planar, outer surface can be formed with regard to the spray arms. Indentations or bulges on the spray arm, as are known from the prior art, can therefore be dispensed with.
  • figure 4 shows a schematic representation of a side view of a dishwasher 1, as is basically known from the prior art.
  • the dishwasher 1 has a housing 2 that accommodates a washing container 3 .
  • the washing compartment 3 in turn provides a washing chamber 4 for receiving items to be washed to be cleaned.
  • the washing compartment 3 has a loading opening 16 for loading the washing compartment 4 with items to be washed.
  • the dishwasher 1 has a spray device 6 .
  • the spray device 6 includes an upper spray arm 7, a middle spray arm 8 and a lower spray arm 19.
  • the spray device 6 is fluidically connected by means of a supply line 11 to a circulating pump 9, by means of which the spray arms 7, 8 and 19 of the spray device 6 are supplied with washing liquor in the case of a washing operation.
  • a circulating pump 9 by means of which the spray arms 7, 8 and 19 of the spray device 6 are supplied with washing liquor in the case of a washing operation.
  • water diverters can be provided, for example in such a way that the spray arms 7 and 8 on the one hand and the spray arm 19 on the other hand can be fed with washing liquid.
  • the rinsing container 3 providing the rinsing space 4 opens out with respect to the plane of the drawing figure 4 into a collection pot 5 on the underside.
  • the circulating pump 9 is connected to this collection pot 5 by means of a suction line 10 .
  • an in figure 4 arranged not shown screening device.
  • the dishwashing liquid circulated by the circulation pump 9 when used as intended reaches the collection pot 5 via the intake line 10, the circulation pump 9 and the supply line 11 in the direction of the arrow 14 to the spray arms 7, 8 and 19 of the spray device 6. From here the dishwashing liquid is Discharged in the direction of arrows 18 or 20 onto the items to be cleaned, from which it then drips and collects again in the collection pot 5 after passing through the sieve device.
  • a waste water line 13 together with a drain pump 12 is connected to the collection pot 5 .
  • the washing liquor that is no longer required in the collection pot 5 can be pumped out by means of the drain pump 12 in the direction of arrow 15 and transferred to a sewage system, not shown in detail.
  • FIG figure 5 shows schematically in a partially sectioned side view according to FIG figure 4 lower spray arm 19.
  • the other two spray arms 7 and 8 are constructed in the same way.
  • the spray arm 19 has a base body 21 . With regard to its vertical extent, this is formed from an upper shell 22 and a lower shell 23, which form a volumetric space 24 between them. In the exemplary embodiment shown, both the upper shell 22 and the lower shell 23 are made of plastic.
  • the lower shell 23 is equipped with a connection 25 for the supply of washing liquor.
  • the spray arm 19 rotates about the axis of rotation 26 defined by the connection 25, either clockwise or counterclockwise.
  • the upper shell 22 is equipped with a plurality of nozzles 27 which, when used as intended, dispense washing liquor in the direction of the items to be washed in accordance with the arrows 20 .
  • washing liquor initially flows via the connection 25 into the volume space 24 provided by the base body 21 . From here, the washing liquor is distributed to the individual nozzles 27, via which the washing liquor is then released in the manner already described above in the direction of the items to be washed.
  • a nozzle design known from the prior art is figure 6 shown.
  • the nozzle 27 provides a nozzle inlet opening 28 on the inlet side and a nozzle outlet opening 29 on the outlet side. Between the nozzle inlet opening 28 and the nozzle outlet opening 29, the nozzle space 30 is formed, which is funnel-shaped or conical. When used as intended, a jet forms, as is shown schematically by the arrows 33 .
  • the funnel or cone shape of the nozzle space 20 essentially has two advantages.
  • the funnel or conical shape of the nozzle 27 leads to the constriction of the nozzle jet symbolized by the arrows 33 .
  • This in turn means that the hydraulic cross section 32 of the jet is smaller than the geometric cross section 31 of the nozzle outlet opening 29.
  • This has the advantage that the tendency of the nozzle 27 to become clogged is reduced.
  • a further advantage of the funnel-shaped or conical design of the nozzle space 30 results from the fact that the nozzle 27 can also be designed to be inclined in its orientation, without the demolding direction of the tool having to be changed, as shown in FIG this from a synopsis of the others Figures 7 to 9 results.
  • the upper shell 22 is made of plastic and is preferably produced using an injection molding process.
  • an upper tool 34 in the vertical direction and a lower tool 35 in the vertical direction are used, like this figure 7 reveals.
  • the lower tool 35 has the corresponding nozzle contour 36 which takes care of the geometric configuration of the nozzle 27 .
  • a demolding of the upper shell 22 takes place with reference to the plane of the page figure 7 up or down instead. This direction of demoulding also makes it possible to form inclined nozzle contours, as is the case Figures 8 and 9 reveal.
  • figure 8 shows a schematic detail view of a nozzle 27 which, in comparison to the symmetrical nozzle configuration (dashed line), in the sectional view figure 8 has left-side wall, which is formed inclined outwards.
  • a nozzle geometry which, when used as intended, forms a nozzle jet inclined to the vertical, in accordance with arrow 38.
  • figure 9 shows a comparable nozzle design, but with the difference that the nozzle geometry shown here leads to an inclination of the nozzle jet in accordance with the arrow 38 with respect to the plane of the drawing figure 9 leads to the left.
  • the nozzle 27 shown here is also not embodied symmetrically to the center line 37, but instead points in relation to the sectional plane figure 9 a wall on the right-hand side, which tapers less steeply in the flow direction of the nozzle 27 than the configuration of the nozzle 27 which is symmetrical to the center line 37 according to the dashed line.
  • figure 1 a schematic detail view of a nozzle geometry according to the invention.
  • the nozzle 27 according to the invention has according to figure 1 a nozzle chamber 30 and a through-flow chamber 40 downstream of the nozzle chamber 30 in the through-flow direction 39 .
  • the through-flow space 40 directly adjoins the nozzle space 30 with the interposition of a through-flow opening 41 .
  • the through-flow opening 41 and the nozzle outlet opening 39 are thus spatially separated from one another in the vertical direction.
  • the height H of the through-flow space 40 is preferably 0.1 mm to 1.0 mm.
  • the configuration according to the invention has the advantage that the tear-off edge of the flow defined by the through-flow opening 41 and the outer body edge of the upper shell 22, which coincides with the edge of the tool separation during production, are spatially separated from one another, as is shown in particular in the illustration figure 2 reveals. Consequently, if the upper shell 22 has a degree of spattering at the tool parting edge, this does not affect the flow of a fluid guided through the nozzle 27, since the tear-off edge is of essential importance for the formation of the fluid jet shape.
  • figure 2 shows the upper tool 34 and the lower tool 35 for forming a nozzle 27 according to the invention.
  • the lower tool 35 provides the nozzle contour 36 in a manner known per se, which, in contrast to the prior art, has a shoulder 42 which ensures the formation of the through-flow space 40 when used as intended.
  • the nozzle inlet opening 28 or the nozzle outlet opening 29 and the through-flow opening 41 are aligned plane-parallel to one another.
  • the surface normals n 1 , n 2 and n 3 of the nozzle inlet opening 28, the nozzle outlet opening 29 and the flow opening 41 are therefore aligned parallel to one another.
  • figure 3 shows an alternative embodiment. Thereafter, the flow opening 41 is inclined to the vertical, whereby the surface normals n 1 and n 3 on the one hand and n 2 on the other hand are aligned transversely to one another.
  • a nozzle jet is produced which is inclined relative to the vertical, as is symbolized by the arrows 33 .
  • the inclined nozzle jet geometry is not achieved by enlarging the nozzle inlet opening 28 as a result of an inclined nozzle wall configuration but in that the through-flow opening 41 formed between the nozzle space 30 and the through-flow space 40 is inclined in its orientation to the vertical.
  • the space requirement of a nozzle 27 with an inclined nozzle jet is equal to the space requirement of a nozzle 27 with a non-inclined nozzle jet.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Claims (9)

  1. Bras d'aspersion pour une machine à laver la vaisselle, avec un corps de base (21), qui présente une coque supérieure (22) et une coque inférieure (23) agencée dessus, dans lequel la coque supérieure (22) est formée en matière plastique et fournit une pluralité de buses (27), qui sont formées comme partie intégrante du corps de base (21) d'une seule pièce avec celui-ci, dans lequel la surface extérieure côté buse de la coque supérieure (22) est formée plane, dans lequel les buses (27) présentent respectivement une chambre de buse (30) et une chambre de passage (40) agencée en aval de la chambre de buse (30) dans la direction de passage (39), qui se raccorde à la chambre de buse (30) directement avec interposition d'une ouverture de passage (41).
  2. Bras d'aspersion selon la revendication 1, caractérisé en ce que la buse (27) présente côté entrée une ouverture d'entrée de buse (28), dans lequel la section transversale de l'ouverture d'entrée de buse est supérieure à la section transversale de l'ouverture de passage (41).
  3. Bras d'aspersion selon la revendication 1 ou 2, caractérisé en ce que la buse (27) présente côté sortie une ouverture de sortie de buse (29), dans lequel la section transversale de l'ouverture de sortie de buse (29) est inférieure à la section transversale de l'ouverture de passage (41) ou identique à la section transversale de l'ouverture de passage (41).
  4. Bras d'aspersion selon l'une quelconque des revendications précédentes, caractérisé en ce que la chambre de buse (30) est en forme d'entonnoir dans la direction de passage (39).
  5. Bras d'aspersion selon l'une quelconque des revendications précédentes, caractérisé en ce que la chambre de passage (40) est en forme de cylindre circulaire dans la direction de passage (39).
  6. Bras d'aspersion selon l'une quelconque des revendications précédentes, caractérisé en ce que les normales à la surface (n1, n3) des surfaces en section transversale de l'ouverture de sortie de buse (29) et de l'ouverture d'entrée de buse (28) s'étendent parallèlement l'une à l'autre.
  7. Bras d'aspersion selon l'une quelconque des revendications
    précédentes 3 à 6, caractérisé en ce que les normales à la surface (n1, n2) des surfaces en section transversale de l'ouverture de sortie de buse (29) et de l'ouverture de passage (41) s'étendent transversalement l'une à l'autre.
  8. Bras d'aspersion selon l'une quelconque des revendications précédentes, caractérisé en ce que la chambre de passage (40) présente une étendue dans la direction de la hauteur de H = 0,1 mm à 1,0 mm, de préférence de H = 0,4 mm à 0,7 mm, plus préférablement de H = 0,5 mm à 0,6 mm.
  9. Machine à laver la vaisselle, en particulier machine à laver la vaisselle domestique, comprenant un dispositif d'aspersion (6) pour soumettre les articles à nettoyer à un bain de rinçage, caractérisée en ce que le dispositif d'aspersion (6) présente un bras d'aspersion (19) selon l'une quelconque des revendications précédentes.
EP19172707.2A 2018-05-15 2019-05-06 Bras pulvérisateur pour un lave-vaisselle Active EP3586713B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018111613 2018-05-15

Publications (2)

Publication Number Publication Date
EP3586713A1 EP3586713A1 (fr) 2020-01-01
EP3586713B1 true EP3586713B1 (fr) 2023-04-26

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ID=66429235

Family Applications (1)

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EP19172707.2A Active EP3586713B1 (fr) 2018-05-15 2019-05-06 Bras pulvérisateur pour un lave-vaisselle

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EP (1) EP3586713B1 (fr)
PL (1) PL3586713T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1302680B (fr) * 1963-07-18 1970-11-26
DE1628813B2 (de) * 1966-08-27 1971-09-02 Stierlen Werke AG 7550 Rastatt Waschstrahlduese fuer gewerbliche geschirrspuelmaschinen
JP3744049B2 (ja) * 1996-03-15 2006-02-08 松下電器産業株式会社 食器洗い乾燥機
DE102010043019A1 (de) * 2010-10-27 2012-05-03 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltsgerät, insbesondere Geschirrspülmaschine

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EP3586713A1 (fr) 2020-01-01
PL3586713T3 (pl) 2023-07-17

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