EP3586713A1 - Bras pulvérisateur pour un lave-vaisselle - Google Patents

Bras pulvérisateur pour un lave-vaisselle Download PDF

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Publication number
EP3586713A1
EP3586713A1 EP19172707.2A EP19172707A EP3586713A1 EP 3586713 A1 EP3586713 A1 EP 3586713A1 EP 19172707 A EP19172707 A EP 19172707A EP 3586713 A1 EP3586713 A1 EP 3586713A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
opening
flow
spray arm
space
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.)
Granted
Application number
EP19172707.2A
Other languages
German (de)
English (en)
Other versions
EP3586713B1 (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
Anticipated expiration legal-status 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
    • A47L15/42—Details
    • A47L15/4278—Nozzles

Definitions

  • the invention relates to a spray arm for a dishwasher, with a base body formed at least partially from plastic and a nozzle which is formed integrally with the base body as an integral part thereof. Furthermore, the invention relates to a dishwasher equipped with a spray arm.
  • Dishwashers as such and spray arms for dishwashers are known per se from the prior art, which is why there is no need for a separate documentary proof at this point.
  • Dishwashers of the known type have a washing container which provides a washing compartment.
  • This wash cabinet is accessible by the user via a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted wash cabinet door.
  • the washing container serves to hold items to be cleaned, which in the case of a domestic dishwasher can be, in particular, dishes, cutlery and / or the like.
  • the dishwasher has a spray device on the wash cabinet side for loading washware to be cleaned with washing liquid, the so-called washing liquor.
  • This spray device generally provides rotatable spray arms, typically two or three such spray arms being provided. In the intended use, washware to be cleaned is acted upon by means of rotating spray arms.
  • a circulation pump is provided for the purpose of supplying the spray arms with washing liquor, which is connected on the one hand to a collecting pot into which the washing container flows in terms of flow technology, and on the other hand is connected to the spray arms in terms of flow technology.
  • the washing liquor dispensed by the spraying device collects in the collecting pot.
  • the circulating pump conveys the washing liquor accumulating in the collecting pot to the spray arms of the spray device, from where the washing liquor is then discharged in the direction of the wash ware to be cleaned takes place.
  • a spray arm typically has a base body which is at least partially formed from plastic.
  • the base body is formed in two parts and has an upper shell on the one hand and a lower shell arranged thereon on the other. 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 to form a volume space, for example glued or welded to one another.
  • the spray arm provides at least one nozzle, preferably a plurality of nozzles, through which rinsing liquor is dispensed in the intended use.
  • the nozzles are integrally formed with the base body as an integral part thereof. In the simplest case, the nozzles are formed by respective recesses in the upper shell of the base body, the volume space provided by the base body flowing into the nozzles.
  • funnel-shaped or conical nozzles have proven particularly useful. Because the cone shape has two main advantages. On the one hand, the nozzle can be inclined in its vertical orientation to the horizontal without having to change the demolding direction of the tool provided for the injection molding of the upper shell. On the other hand, the conical shape of the nozzle constricts the water jet formed by the nozzle in the intended use. This in turn leads to the hydraulic diameter of the water jet being smaller than the geometric diameter of the nozzle outlet opening, which has the advantage that the nozzle has an overall reduced tendency to clog.
  • a spray arm for a dishwasher with an at least partially of plastic formed body and a nozzle which is formed as an integral part of the base body in one piece with this, wherein the nozzle has a nozzle chamber and one in the direction of flow to the nozzle area has downstream flow space, which directly adjoins the nozzle space with the interposition of a flow opening.
  • the nozzle according to the configuration according to the invention has a nozzle chamber known per se from the prior art.
  • a flow-through space is also provided which adjoins the nozzle space in terms of flow in the flow-through direction of the nozzle.
  • a fluid flowing through the nozzle in the intended use thus initially reaches the nozzle space on the inlet side, from where it reaches the flow space adjoining the nozzle space. This provides an outlet opening on the nozzle outlet side, through which the fluid leaves the nozzle.
  • the flow space directly adjoins the nozzle space with the interposition of a flow opening.
  • the outlet opening of the nozzle chamber and the inlet opening of the flow-through space therefore coincide and form the flow-through opening.
  • the refinement according to the invention has the advantage that the nozzle outlet is offset to the rear by the flow connection of the flow space.
  • the tear-off edge on the nozzle chamber exit side for the fluid flowing through the nozzle and the nozzle outlet opening provided by the base body on the outlet side of the flow chamber separate spatially.
  • any degree of injection which cannot be avoided due to the manufacturing process, on the contour of the base body delimiting nozzle outlet opening, but not on the separation edge spaced apart and defined by the throughflow opening.
  • this results in an expression of the fluid jet formed by the nozzle, regardless of any degree of spraying. This can lead to the formation of a fluid jet which is undisturbed and thus controlled in terms of its geometric configuration.
  • the configuration according to the invention has a further advantage.
  • the throughflow opening spaced apart from the spatial end edge of the base body, or the flow opening defined here by a defined tear-off edge can be made correspondingly inclined, which, in contrast to the prior art, does not require an enlarged nozzle space and thus also does not require an increased installation space.
  • no additional nozzle components that may otherwise be required are required in order to realize a nozzle outlet surface that is inclined to the horizontal.
  • the configuration according to the invention produces the synergetic effect that, on the one hand, a proper jet design is achieved and, on the other hand, that an inclined nozzle design is also allowed without increasing space requirements, and this, in addition, without additional nozzle components.
  • a flow-through space is connected downstream of the actual nozzle space in terms of flow technology, the nozzle space providing the nozzle inlet opening on the inlet side and the nozzle outlet opening providing the flow-through space on the outlet side of the nozzle.
  • the nozzle space and the flow-through space are formed directly adjacent to one another with the interposition of a flow-through opening, which flow-through opening defines the tear-off edge for a fluid flowing through the nozzle.
  • This tear-off edge defined by the throughflow opening can also be oriented inclined to the horizontal, which, in the intended use, produces a beam formation 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 throughflow opening.
  • the nozzle space There is a funnel-shaped or conical configuration of the nozzle space. This leads to the formation of a nozzle jet in a manner known per se in the intended use.
  • 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 throughflow opening or equal to the cross section of the throughflow opening.
  • the throughflow opening forms, in the manner already described, the tear-off edge for the fluid flowing through the nozzle in the intended use. It can be provided according to a first alternative of the invention that the cross section of the outlet-side nozzle outlet opening and the cross section of the flow opening are the same size. In this case, the nozzle emits a straight jet in the vertical direction.
  • the flow opening is designed 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 direction of flow.
  • the throughflow opening delimiting the funnel or cone shape can, in accordance with the above statements, either be oriented plane-parallel to the cross sections of the nozzle inlet opening or the nozzle outlet opening or inclined thereto.
  • the flow-through space is designed in the form of a circular cone in the flow-through direction.
  • a guide which widens in the direction of the nozzle outlet opening can also be provided. critical is that the throughflow opening is designed to be degree-free, which is achieved according to the invention in that the nozzle outlet opening and the throughflow opening are spatially separated from one another by the flow-through space adjoining the nozzle space in terms of flow technology.
  • the surface normals of the cross-sectional areas of the nozzle inlet opening and 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, 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 throughflow opening and nozzle inlet or nozzle outlet opening are aligned parallel to one another.
  • a parallel to the vertical ie. H. a nozzle jet aligned at right angles to the base body.
  • the surface normals of the cross-sectional areas of the throughflow opening and nozzle outlet opening run transversely to one another.
  • the throughflow opening is oriented inclined to the horizontal or to the vertical, which in the intended use leads to the fact that the fluid passed through the nozzle forms a nozzle jet inclined to the vertical.
  • the base body has an upper shell and a lower shell arranged on it, the upper shell being formed from plastic and providing the nozzle.
  • the lower shell can also be made of plastic.
  • the upper shell and the lower shell can be glued and / or welded together.
  • the lower shell can be made of a different material, for example metal.
  • the upper shell of the base body preferably accommodates not only one nozzle but a multiplicity of nozzles which can be designed differently, in particular with regard to the inclination of the flow opening provided in each case.
  • the outer surface of the upper shell or of the base body on the nozzle side is flat. Accordingly, the nozzles do not protrude in sections from the outer surface of the base body and there are also no surface recesses in the area of a nozzle, which is particularly advantageous for reasons of better 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 throughflow opening is offset from the outer surface of the upper shell by 0.1 mm to 1.0 mm in the height direction downwards. In the manner already described, the throughflow 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. A spacing of the throughflow opening from the nozzle outlet opening of 0.1 mm to 1.0 mm is preferred.
  • the invention further proposes a dishwasher, in particular a household dishwasher, with a washing compartment which provides a washing compartment and is used to hold items to be cleaned, the washing container for loading items to be washed having a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted washing compartment door , and with a spray device for loading washware to be cleaned with washing liquor, the spray device having a spray arm of the type described above.
  • a dishwasher in particular a household dishwasher, with a washing compartment which provides a washing compartment and is used to hold items to be cleaned, the washing container for loading items to be washed having a loading opening which can be closed in a fluid-tight manner by means of a pivotably mounted washing compartment door , and with a spray device for loading washware to be cleaned with washing liquor, the spray device having a spray arm of the type described above.
  • a dishwasher designed in the manner according to the invention provides the advantages already explained above.
  • the beam direction can be set by providing a tear-off edge that is not aligned plane-parallel to the body edge.
  • the configuration according to the invention also has the advantage that a design level, i.e. flat outer surface can be formed with respect to the spray arms. Imprints or curvatures on the spray arm, as are known from the prior art, can therefore be dispensed with.
  • Figure 4 can be seen in a schematic representation in side view of a dishwasher 1, as is basically known from the prior art.
  • the dishwasher 1 has a housing 2 that receives a washing container 3.
  • the washing compartment 3 in turn provides a washing compartment 4 for receiving items to be cleaned.
  • the wash container 3 has a loading opening 16.
  • This loading opening 16 can be closed in a fluid-tight manner by means of a wash cabinet door 17, the wash cabinet door 17 being mounted so as to be pivotable about a horizontally extending pivot axis.
  • the washware to be cleaned is subjected to washing liquor, for which purpose 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 connected in terms of flow to a circulation pump 9 by means of a supply line 11, 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 circulation pump 9 by means of a supply line 11, 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 switches may not be shown in the drawing, for example in such a way that loading with rinsing liquor of the spray arms 7 and 8 on the one hand and the spray arm 19 on the other hand is possible.
  • the washing compartment 3 providing the washing compartment 4 opens out with reference to the drawing level Figure 4 on the underside in a collecting pot 5.
  • the circulation pump 9 is connected to this collecting pot 5 by means of a suction line 10.
  • the rinsing liquor circulated in the intended use by the circulation pump 9 passes from the collecting pot 5 via the suction line 10, the circulation pump 9 and the supply line 11 in the direction of arrow 14 to the spray arms 7, 8 and 19 of the spray device 6. From here the rinsing liquor becomes Dispensed in the direction of arrows 18 and 20 onto the items to be cleaned, from which it then drips and, after passing through the sieving device, accumulates again in the collecting pot 5.
  • a wastewater line 13 together with a drain pump 12 is also connected to the collection pot 5. After completion of a washing operation carried out as intended, the washing liquor located in the collecting pot 5 and no longer required can be pumped out by means of the drain pump 12 in the direction of the arrow 15 and transferred to a sewage system (not shown).
  • Figure 5 shows schematically in a partially sectioned side view of the 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 extension, this is formed from an upper shell 22 and a lower shell 23, which form a volume space 24 between them. In the exemplary embodiment shown, both the upper shell 22 and the lower shell 23 are formed from 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, in the intended use, deliver washing liquor in the direction of the items to be cleaned in accordance with the arrows 20.
  • the washing liquor first flows over 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 dispensed in the manner described above in the direction of the wash ware to be cleaned.
  • a nozzle configuration known from the prior art is shown in 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.
  • the nozzle space 30, which is funnel-shaped or conical, is formed between the nozzle inlet opening 28 and the nozzle outlet opening 29.
  • a nozzle jet is formed, as is shown schematically by the arrows 33.
  • the funnel or cone shape of the nozzle space 20 has two main advantages.
  • the funnel or cone shape of the nozzle 27 leads to the constriction of the nozzle jet symbolized by the arrows 33. This in turn leads to the hydraulic cross section 32 of the nozzle jet being 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 clog is reduced.
  • the upper shell 22 is made of plastic and is preferably produced by injection molding.
  • an upper tool 34 in the vertical direction and a lower tool 35 in the vertical direction are used, such as 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.
  • the upper shell 22 is removed from the mold with respect to the sheet plane Figure 7 up or down instead. This direction of removal also allows inclined nozzle contours to be formed, as is the case with Figures 8 and 9 reveal.
  • Figure 8 shows a schematic sectional view of a nozzle 27, which in comparison to the symmetrical nozzle design (dashed line) in the sectional view Figure 8 has left-hand wall, which is formed inclined to the outside. This creates a nozzle geometry which, when used as intended, forms a nozzle jet inclined to the vertical, in accordance with the arrow 38.
  • Figure 9 shows a comparable nozzle design, but with the difference that the nozzle geometry shown here to an inclination of the nozzle jet in accordance with the arrow 38 with reference to the plane of the drawing Figure 9 leads to the left.
  • the nozzle 27 shown here is also not symmetrical to the center line 37, but rather demonstrates with reference to the cutting plane Figure 9 a right-hand wall, which tapers in the direction of flow through the nozzle 27 less steeply than the configuration of the nozzle 27 symmetrical to the center line 37 according to the dashed line.
  • the nozzle 27 has according to Figure 1 a nozzle space 30 and a flow space 40 arranged downstream of the nozzle space 30 in the flow direction 39.
  • the flow-through space 40 directly adjoins the nozzle space 30 with the interposition of a flow-through opening 41.
  • the throughflow opening 41 and the nozzle outlet opening 39 are thus spatially separated from one another in the height direction.
  • the height H of the flow-through space 40 is preferably 0.1 mm to 1.0 mm.
  • the embodiment according to the invention has the advantage that the tear-off edge of the flow defined by the throughflow opening 41 and the outer body edge of the upper shell 22, which coincides with the edge of the tool separation during manufacture, are spatially separated from one another, as is shown in particular in FIG Figure 2 reveals.
  • the upper shell 22 has an injection degree at the tool separating edge, this does not influence the flow of a fluid passed 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.
  • this represents lower tool 35
  • the nozzle contour 36 is ready in a manner known per se, which, in contrast to the prior art, has a shoulder 42 which, in the intended use, takes care of the formation of the flow-through space 40.
  • the nozzle inlet opening 28 or the nozzle outlet opening 29 and the throughflow opening 41 are aligned plane-parallel to one another.
  • the surface normals ni, 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.
  • the result of this configuration results in a nozzle jet running in the direction of the center line 37, ie in the vertical direction, in the intended use.
  • Figure 3 shows an alternative embodiment.
  • the throughflow opening 41 is then inclined to the vertical, so that 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.
  • the result of this configuration results in a nozzle jet inclined to the vertical when used as intended, as symbolized by the arrows 33.
  • no enlarged nozzle inlet opening 28 In contrast to the configuration according to the prior art according to FIG Figures 8 and 9 no enlarged nozzle inlet opening 28.
  • the inclined nozzle jet geometry is not achieved by the nozzle inlet opening 28 being enlarged as a result of an inclined nozzle wall configuration, but by the fact that the throughflow opening 41 formed between nozzle chamber 30 and flow chamber 40 is inclined in its orientation to the vertical.
  • the space requirement of a nozzle 27 with an inclined nozzle jet is thus equal to the space requirement of a nozzle 27 with a non-inclined nozzle jet.

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  • Washing And Drying Of Tableware (AREA)
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 true EP3586713A1 (fr) 2020-01-01
EP3586713B1 EP3586713B1 (fr) 2023-04-26

Family

ID=66429235

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428349A1 (de) * 1963-07-18 1968-11-21 Bosch Gmbh Robert Geschirrspuelmaschine
DE1628813A1 (de) * 1966-08-27 1970-07-16 Stierlen Werke Ag Waschstrahlduese fuer Geschirrspuelmaschinen
JPH09248270A (ja) * 1996-03-15 1997-09-22 Matsushita Electric Ind Co Ltd 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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428349A1 (de) * 1963-07-18 1968-11-21 Bosch Gmbh Robert Geschirrspuelmaschine
DE1628813A1 (de) * 1966-08-27 1970-07-16 Stierlen Werke Ag Waschstrahlduese fuer Geschirrspuelmaschinen
JPH09248270A (ja) * 1996-03-15 1997-09-22 Matsushita Electric Ind Co Ltd 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

Also Published As

Publication number Publication date
PL3586713T3 (pl) 2023-07-17
EP3586713B1 (fr) 2023-04-26

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