EP3515275B1 - Domestic dishwasher - Google Patents

Description

The present invention relates to a household dishwasher.

In household dishwashers, items to be cleaned are usually loaded with washing liquor using rotatable spray arms. Such spray arms comprise a large number of spray arm nozzles through which the washing liquor emerges. The recoil of the exiting wash liquor sets the spray arm in rotation. Since the spray arm nozzles move on a circular path, a round crockery basket adapted to this circular path is ideal with regard to the loading of the wash ware with wash liquor. However, since the basic shape of most household dishwashers extends in length and width dimension, there can also be areas in a polygonal crockery basket that cannot be optimally loaded with washing liquor. To keep the spray shadow as small as possible, several spray arms can be used instead of one spray arm. If several intermeshing spray arms are arranged on an identical spray arm level, mutual control of the intermeshing spray arms is required. This can be done via belts, toothed pulleys, gears, stepper motors, electronic brakes or the like.

The WO 2004/023968 A2 describes a dishwasher with a first spray arm and a second spray arm. The spray arms are arranged in different spray arm levels, the axes of rotation of the spray arms being tilted toward one another. The EP 0 559 466 B1 describes a dishwasher with several spray arms, which are arranged in different spray arm levels, so that the spray arms are placed one above the other.

The DE 10 2010 032005 A1 discloses a household dishwasher according to the preamble of claim 1.

Against this background, it is an object of the present invention to provide an improved household dishwasher.

Accordingly, a household dishwasher with a first spray arm, which has a first spray circuit, a second spray arm, which is one with the first Has spray circuit overlapping second spray circuit, and a synchronizing device which is configured to adapt a speed of the first spray arm to a speed of the second spray arm or vice versa. The synchronization device comprises a first magnetic field assigned to the first spray arm and a second magnetic field assigned to the second spray arm, the first magnetic field and the second magnetic field having the same polarization, so that the first magnetic field and the second magnetic field repel one another when the household dishwasher is operating to prevent contact of the first spray arm and the second spray arm during a rotational movement of the same.

For example, the first magnetic field and the second magnetic field are each designed as a north pole or as a south pole. The synchronizing device enables the speed of rotation of the first spray arm and the speed of the second spray arm to be synchronized without requiring mechanical coupling of the spray arms. The first magnetic field and the second magnetic field are each generated with the aid of a magnetic element or a magnetizable, in particular ferromagnetic, material. The magnetic field and / or the magnetizable material can be part of the synchronizing device. The synchronization device can comprise a large number of magnetic fields. The spray circles overlap in particular in an overlap area. In the overlap area, washware is particularly intensively loaded with washing liquor, which results in a particularly good cleaning effect in the overlap area.

According to one embodiment, the first spray arm and the second spray arm are arranged in a common spray arm plane.

The spray arm level can, for example, run centrally through the two spray arms and each divide them into an upper shell and a lower shell. Alternatively, the spray arm level can also be spanned by spray arm nozzles of the spray arms. Because the first spray arm and the second spray arm are arranged in a common spray arm plane, they engage in one another when the same is rotated. This results in a particularly small space requirement in a vertical direction.

According to a further embodiment, the first spray arm and / or the second spray arm are at least partially made of a magnetizable material.

As a result, additional magnetic elements can be dispensed with. In particular, the magnetizable material is a ferromagnetic material.

According to a further embodiment, the first spray arm and / or the second spray arm are at least partially made of metal or a magnetizable plastic material.

For example, the spray arms each have an upper shell and a lower shell, which are connected to one another with the aid of injection-molded connecting elements. The connecting elements can be made of the magnetizable plastic material. In this way, material savings can be achieved through the economical use of the magnetizable plastic material. Alternatively, the spray arms can be made, for example, at least in sections of a magnetizable metal sheet.

According to a further embodiment, the first spray arm and / or the second spray arm each have a magnetic element, in particular a permanent magnet element.

The magnetic element can, for example, be glued or clipped onto the respective spray arm. Alternatively, the magnetic element can be arranged within the material of the respective spray arm.

According to a further embodiment, the magnetic element is extrusion-coated with a plastic material.

This protects the magnetic element from moisture. Additional fastening means for fastening the magnetic element to the respective spray arm can be dispensed with.

According to a further embodiment, two magnetic fields with different polarization are assigned to each spray arm.

Each spray arm is preferably assigned four magnetic fields, two magnetic fields each having the same polarization. That is, two magnetic fields are formed as the south pole and two magnetic fields as the north pole.

According to a further embodiment, each spray arm has a first spray arm section, a second spray arm section and an axis of rotation arranged centrally between the spray arm sections, wherein each spray arm section is assigned two magnetic fields with different polarization.

The number of spray arm sections is arbitrary. Three or four spray arm sections can also be provided. With the help of the axis of rotation, the respective spray arm is rotatably mounted on a washing container of the household dishwasher. Rinsing liquor can also be supplied to the respective spray arm via the axis of rotation.

According to a further embodiment, the household dishwasher comprises a third to nth spray arm which has a third to nth spray circuit which overlaps with the first spray circuit or the second spray circuit, the third to nth spray arm having a third to n- The first magnetic field or the second magnetic field and the third to nth magnetic field have the same polarization, so that the first magnetic field or the second magnetic field and the third to nth magnetic field repel one another when the household dishwasher is operating to prevent contact of the first spray arm or the second spray arm and the third to nth spray arms when the same is rotated.

The number of spray arms is arbitrary. For example, six spray arms are provided. n is preferably greater than four and an integer. In particular, the spray arms can have spray circles with different diameters. For example, a third to sixth spray arm each have a spray circle whose diameter is smaller than a diameter of a respective spray circle of the first spray arm and the second spray arm. The third to sixth spray arms can then each be arranged in a corner of a washware receptacle of the household dishwasher. In this way, a particularly uniform loading of the wash ware with wash liquor can be achieved.

According to a further embodiment, the household dishwasher comprises a washing container on which the spray arms are rotatably mounted.

Alternatively, the spray arms can also be rotatably mounted on items to be washed in the household dishwasher. The household dishwasher preferably comprises a plurality of washware receptacles which are placed one above the other in the wash container. A large number of spray arms can be assigned to each washware receptacle, which are each arranged above or below the respective washware receptacle.

Further possible implementations of the household dishwasher also include combinations of features or embodiments described above or below with reference to the exemplary embodiments that are not explicitly mentioned. The person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the household dishwasher.

Fig. 1

zeigt eine schematische perspektivische Ansicht einer Ausführungsform einer Haushalts-Geschirrspülmaschine;

Fig. 2

zeigt eine schematische Aufsicht einer Spülgutaufnahme für die Haushalts-Geschirrspülmaschine gemäß Fig. 1;

Fig. 3

zeigt eine schematische Ansicht mehrerer Sprüharme für die Haushalts-Geschirrspülmaschine gemäß Fig. 1;

Fig. 4

zeigt eine schematische Schnittansicht eines Sprüharms für die Haushalts-Geschirrspülmaschine gemäß Fig. 3; und

Fig. 5

zeigt eine weitere schematische Schnittansicht eines Sprüharms für die Haushalts-Geschirrspülmaschine gemäß Fig. 1.

Further advantageous refinements and aspects of the household dishwasher are the subject of the subclaims and the exemplary embodiments of the household dishwasher described below. Furthermore, the household dishwasher is explained in more detail based on preferred embodiments with reference to the accompanying figures.

Fig. 1

shows a schematic perspective view of an embodiment of a household dishwasher;

Fig. 2

shows a schematic plan view of a washware receptacle for the household dishwasher according to Fig. 1 ;

Fig. 3

shows a schematic view of several spray arms for the household dishwasher according to Fig. 1 ;

Fig. 4

shows a schematic sectional view of a spray arm for the household dishwasher according to Fig. 3 ; and

Fig. 5

shows a further schematic sectional view of a spray arm for the household dishwasher according to Fig. 1 .

In the figures, elements that are the same or have the same function have been provided with the same reference symbols, unless stated otherwise.

The Fig. 1 shows a schematic perspective view of an embodiment of a domestic dishwasher 1. The domestic dishwasher 1 comprises a washing container 2, which can be closed by a door 3, in particular in a watertight manner. For this purpose, a sealing device can be provided between the door 3 and the washing container 2. The rinsing container 2 is preferably cuboid. The washing container 2 can be arranged in a housing of the domestic dishwasher 1. The washing container 2 and the door 3 can form a washing chamber 4 for washing dishes.

The door 3 is in the Fig. 1 shown in their open position. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at a lower end of the door 3. With the help of the door 3, a loading opening 6 of the washing compartment 2 can be closed or opened. The washing compartment 2 has a base 7, a ceiling 8 arranged opposite the base 7, a rear wall 9 arranged opposite the closed door 3 and two side walls 10, 11 arranged opposite one another. The bottom 7, the ceiling 8, the rear wall 9 and the side walls 10, 11 can for example be made of a stainless steel sheet. Alternatively, for example, the bottom 7 can be made of a plastic material.

The household dishwasher 1 also has at least one washware receptacle 12 to 14. Preferably, several, for example three, washware receptacles 12 to 14 can be provided, a first washware receptacle 12 being a lower dish rack or lower basket, a second washware receptacle 13 an upper dish rack or upper basket and a third washware receptacle 14 being a cutlery drawer. As the Fig. 1 further shows, the items to be washed 12 to 14 are arranged one above the other in the washing container 2. Each washware receptacle 12 to 14 can either be moved into or out of the washing tub 2. In particular, each wash item is 12 to 14 in can be pushed into the washing compartment 2 in an insertion direction E and pulled out of the washing compartment 2 in a pull-out direction A against the insertion direction E.

The Fig. 2 shows a schematic top view of the washware receptacle 14. However, the technical features explained below can also apply to the washware receptacles 12, 13. The household dishwasher 1 comprises a first spray arm 15, which is rotatably mounted on the washing container 2, in particular on the ceiling 8. The first spray arm 15 comprises a first spray arm section 16, a second spray arm section 17 and an axis of rotation 18 arranged centrally between the spray arm sections 16, 17. Rinse liquor for cleaning items to be washed can be supplied to the first spray arm 15 via the axis of rotation 18. With the help of the axis of rotation 23, the second spray arm 20 is rotatably mounted on the washing container 2. The first spray arm 15 has a first spray circuit 19, the center of which is the axis of rotation 18.

The household dishwasher 1 further comprises a second spray arm 20 which, like the first spray arm 15, has a first spray arm section 21, a second spray arm section 22 and an axis of rotation 23 arranged centrally between the spray arm sections 21, 22. Rinsing liquor can be supplied to the second spray arm 20 via the axis of rotation 23. The second spray arm 20 comprises a second spray circuit 24, the center of which is the axis of rotation 23.

The first spray circuit 19 and the second spray circuit 24 overlap one another in the Fig. 2 hatched overlap area 25. That is, in the operation of the domestic dishwasher 1, in which the spray arms 15, 20 rotate about their respective axes of rotation 18, 23, the first spray arm 15 engages in the second spray arm 20 or vice versa.

The first spray arm 15 and the second spray arm 20 are arranged in a common spray arm plane SE. The spray arm level SE can each be arranged above one of the washware receptacles 12 to 14. For example, the spray arm level SE can be arranged between the first washware holder 12 and the second washware holder 13, between the second washware holder 13 and the third washware holder 14 or above the third washware holder 14. The spray arm level SE can also be arranged below the respective washware receptacle 12 to 14. Anyone can do it Washware receptacles 12 to 14 can be assigned a separate spray arm level SE with the respective spray arms 12, 20. The spray circuits 19, 24 can have the same diameter or different diameters.

The household dishwasher 1 can furthermore have a third spray arm 26 with a first spray arm section 27, a second spray arm section 28 and an axis of rotation 29 arranged between the spray arm sections 27, 28. Rinsing liquor can be fed to the third spray arm 26 via the axis of rotation 29. The third spray arm 26 is rotatably mounted on the washing container 2 with the aid of the axis of rotation 29. The third spray arm 26 comprises a third spray circle 30, the diameter of which is preferably smaller than the diameter of the spray circles 19, 24. The third spray circle 30 overlaps with the second spray circle 24 in an overlap region 31, which is shown in FIG Fig. 2 is hatched.

Furthermore, the household dishwasher 1 can comprise a fourth spray arm 32 with a fourth spray circuit 33, the fourth spray circuit 33 being in one with the first spray circuit 19 Fig. 2 hatched overlap area 34 intersects. The fourth spray arm 32 is preferably constructed identically to the third spray arm 26. Furthermore, a fifth spray arm 35 can be provided with a fifth spray circle 36, which overlaps with the first spray circle 19 in an overlapping area 37 shown with hatching. A sixth spray arm 38 comprises a sixth spray circuit 39, which overlaps with the second spray circuit 24 in an overlapping area 40 shown with hatching. The spray arms 26, 32, 35, 38 are optional.

As the Fig. 2 shows, the spray arms 26, 32, 35, 38 can each be placed in a corner of the washware receptacle 14. The spray circles 19, 24, 30, 33, 36, 39 thus cover almost the entire washware receptacle 14, with a particularly intensive application of washware to the washware being ensured in the overlapping areas 25, 31, 34, 37, 40. The number of spray arms 15, 20, 26, 32, 35, 38 is arbitrary. However, the domestic dishwasher 1 has at least the first spray arm 15 and the second spray arm 20.

The Fig. 3 shows the first spray arm 15 and the second spray arm 20 in a plan. The functionality of the spray arms 26, 32, 35, 38 corresponds to the functionality of the spray arms 15, 20. In the following, however, only the first spray arm 15 and the second spray arm 20 are discussed. The household dishwasher 1 comprises a synchronizing device 41, which is set up to adapt a speed of the first spray arm 15 to a speed of the second spray arm 20 or vice versa. Here, however, the spray arms 15, 20 are mechanically decoupled from one another. This means that there is no mechanical or electromechanical connection in the form of a transmission, belt, synchronized electric motors or the like between the first spray arm 15 and the second spray arm 20.

The synchronization device 41 comprises a first magnetic field 42 assigned to the first spray arm 15 and a second magnetic field 43 assigned to the second spray arm 20. The first magnetic field 42 and the second magnetic field 43 have the same polarization. For example, the first magnetic field 42 and the second magnetic field 43 are designed as north poles N, so that the first magnetic field 42 and the second magnetic field 43 repel one another when the household dishwasher 1 is in operation. This prevents contact between the first spray arm 15 and the second spray arm 20 when the same is rotated.

Each spray arm section 16, 17, 21, 22 is preferably assigned two magnetic fields 42, 44 and 43, 45. The two magnetic fields 42, 44 and 43, 44 of each spray arm section 16, 17, 21, 22 have different polarizations. For example, the magnetic fields 44, 45 are designed as south poles S.

The first spray arm 15 and / or the second spray arm 20 are at least partially made of a magnetizable material. For example, the spray arms 15, 20 can be made of metal or at least partially made of metal. Alternatively, the spray arms 15, 20 can be made at least partially from a magnetizable plastic material. For example, a two-component injection molding process can be used for this.

For example, the spray arms 15, 20, as in the Fig. 4 shown, each have an upper shell 46 and a lower shell 47, which are subsequently injection molded with the aid of two Connecting elements 48, 49 are interconnected. The connecting elements 48, 49 can be made from the magnetizable plastic material, for example the connecting element 48 forming a north pole N and the connecting element 49 forming a south pole S. The spray arm level SE can extend centrally through the spray arms 15, 20. The connecting elements 48, 49 can be part of the synchronization device 41.

Alternatively, the spray arms 15, 20, as in the Fig. 5 shown, each have a magnetic element 50, in particular a permanent magnet element. The magnetic element 50 can be extrusion-coated with a plastic material 51 in a plastic injection molding process. The magnetic element 50 can be part of the synchronizing device 41.

The functionality of the domestic dishwasher 1 is explained below. The spray arms 15, 20 comprise spray arm nozzles through which the washing liquor exits into the washing chamber 4. The spray arms 15, 20, 26, 32, 35, 38 are set in rotation by the pressure of the exiting washing liquor. With the aid of the synchronizing device 41, the repulsion of the magnetic fields 42 to 45 ensures that the spray arms 15, 20, 26, 32, 35, 38 do not touch and synchronization of the speeds of the spray arms 15, 20, 26, 32, 35, 38 takes place. This means that the spray arms 15, 20, 26, 32, 35, 38 are each accelerated or braked depending on one another.

The synchronization device 41 ensures that the spray arms 15, 20, 26, 32, 35, 38 are synchronized without a mechanical or electromechanical coupling. Spray shadows can be minimized by using the small spray arms 26, 32, 35, 38. This can be achieved in particular by placing the small spray arms 26, 32, 35, 38 in the corners of the washware receptacle 14. Electrical or mechanical synchronization means can thus be dispensed with in the area of the washing tub 2 which is subjected to washing liquor. Since such synchronization means are dispensed with, they cannot fail either. There is also no fear of energy loss due to mechanical synchronization means.

When the household dishwasher 1 is switched off, when testing a possible spray arm blockage by rotating one of the spray arms 15, 20, 26, 32, 35, 38, the spray arms 15, 20, 26, 32, 35, 38 can be prevented from colliding with one another. The Spray arms 15, 20, 26, 32, 35, 38 can be easily removed for cleaning without having to consider a gear or other coupling means. No correct positioning of the spray arms 15, 20, 26, 32, 35, 38 is required. All spray arms 15, 20, 26, 32, 35, 38 can be used in a common spray arm level SE, since they control each other. Since corner nozzles or drive nozzles of the spray arms 15, 20, 26, 32, 35, 38 no longer have to be set so obliquely due to the synchronization device 41, the washing liquor hits the washing container 2 more flatly, as a result of which less noise is generated.

The overlapping areas 25, 31, 34, 37, 40 are applied particularly intensively with washing liquor and can be highlighted in color for the user as intensive zones. The large spray circles 19, 24 make it possible to reduce the nozzle pressure since the nozzle spray angle can be better adapted to the load. The items to be washed, in particular cups, can be set steeply, since the accessibility of the items to be washed is improved by the larger spray circuits 19, 24. Due to the steeper cup position, less residual water remains in the cup base, which means that less water has to be evaporated. This leads to energy savings.

Although the present invention has been described using exemplary embodiments, it can be modified in many ways.

Reference symbols used:

1

Household dishwasher

2nd

Rinsing tank

3rd

door

4th

Rinsing chamber

5

Swivel axis

6

Loading opening

7

ground

8th

ceiling

9

Back wall

10th

Side wall

11

Side wall

12th

Washware intake

13

Washware intake

14

Washware intake

15

Spray arm

16

Spray arm section

17th

Spray arm section

18th

Axis of rotation

19th

Spray circuit

20

Spray arm

21

Spray arm section

22

Spray arm section

23

Axis of rotation

24th

Spray circuit

25th

Overlap area

26

Spray arm

27

Spray arm section

28

Spray arm section

29

Axis of rotation

30th

Spray circuit

31

Overlap area

32

Spray arm

33

Spray circuit

34

Overlap area

35

Spray arm

36

Spray circuit

37

Overlap area

38

Spray arm

39

Spray circuit

40

Overlap area

41

Synchronizer

42

Magnetic field

43

Magnetic field

44

Magnetic field

45

Magnetic field

46

Upper shell

47

Lower shell

48

Fastener

49

Fastener

50

Magnetic element

51

Plastic material

A

Extension direction

E

Direction of insertion

N

North Pole

S

South Pole

SE

Spray arm level

Claims (10)

1. Household dishwasher (1) with a first spray arm (15), which has a first spraying circle (19), a second spray arm (20), which has a second spraying circle (24) which overlaps with the first spraying circle (19), and a synchronisation facility (41), which is configured to adapt a rotational speed of the first spray arm (15) to a rotational speed of the second spray arm (20), or vice versa, characterised in that the synchronisation facility (41) comprises a first magnetic field (42) allocated to the first spray arm (15) and a second magnetic field (43) allocated to the second spray arm (20), wherein the first magnetic field (42) and the second magnetic field (43) have the same polarisation, so that the first magnetic field (42) and the second magnetic field (43) repel one another during operation of the household dishwasher (1), in order to prevent contact between the first spray arm (15) and the second spray arm (20) during a rotational movement of the same.
2. Household dishwasher according to claim 1, characterised in that the first spray arm (15) and the second spray arm (20) are arranged in a common spray arm plane (SE).
3. Household dishwasher according to claim 1 or 2, characterised in that the first spray arm (15) and/or the second spray arm (20) are at least partially manufactured from a magnetisable material.
4. Household dishwasher according to claim 3, characterised in that the first spray arm (15) and/or the second spray arm (20) are at least partially manufactured from metal or a magnetisable plastic material.
5. Household dishwasher according to one of claims 1 to 4, characterised in that the first spray arm (15) and/or the second spray arm (20) each have a magnet element (50), in particular a permanent magnet element.
6. Household dishwasher according to claim 5, characterised in that the magnet element (50) is overmoulded with a plastic material (51).
7. Household dishwasher according to one of claims 1 to 6, characterised in that each spray arm (15, 20) is allocated two magnetic fields (42 - 45) with different polarisation in each case.
8. Household dishwasher according to claim 7, characterised in that each spray arm (15, 20) has a first spray arm section (16, 21), a second spray arm section (17, 22) and an axis of rotation (18, 23) arranged centrally between the spray arm sections (16, 17, 21, 22), wherein each spray arm section (16, 17, 21, 22) is allocated two magnetic fields (42 - 45) with different polarisation.
9. Household dishwasher according to one of claims 1 to 8, characterised by a third to nth spray arm (26, 32, 35, 38), which has a third to nth spraying circle (30, 33, 36, 39) overlapping with the first spraying circle (19) or the second spraying circle (24), wherein the third to nth spraying circle (26, 32, 35, 38) is allocated a third to nth magnetic field, and wherein the first magnetic field (42) or the second magnetic field (43) and the third to nth magnetic field have the same polarisation, so that the first magnetic field (42) or the second magnetic field (43) and the third to nth magnetic field repel one another during operation of the household dishwasher (1), in order to prevent contact between the first spray arm (15) or the second spray arm (20) and the third to nth spray arm (26, 32, 35, 38) during a rotational movement of the same.
10. Household dishwasher according to one of claims 1 to 9, characterised by a dishwasher cavity (2), on which the spray arms (15, 20) are installed in a rotatable manner.

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