EP3897334A1

EP3897334A1 - Domestic dishwasher

Info

Publication number: EP3897334A1
Application number: EP19824280.2A
Authority: EP
Inventors: Michael Lugert; Bernd Eisenbart; Werner Oblinger
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2018-12-21
Filing date: 2019-12-12
Publication date: 2021-10-27
Also published as: WO2020126838A1; US20220061625A1; CN113226144A; US11849899B2; DE102018222849A1

Abstract

The invention relates to a domestic dishwasher (1) with a washing container (2) and at least one spraying device (23-25) which is arranged within the washing container (2) for spraying wash liquor and/or fresh water (F) in the washing container (2), wherein the spraying device (23-25) comprises a nozzle (40-42) for spraying the wash liquor and/or the fresh water (F) and a spiral-shaped flow conducting element (43-45) for supplying the wash liquor and/or the fresh water (F) to the nozzle (40-42), and the spiral-shaped flow conducting element (43-45) is designed to supply the wash liquor and/or the fresh water (F) to the nozzle (40-42) during the operation of the spraying device (23-25) such that the wash liquor and/or the fresh water (F) exits the nozzle (40-42) as a rotating conical spray jet (46).

Description

Household dishwasher

The present invention relates to a household dishwasher.

A dishwasher can have a washing container and spray devices arranged in the washing container, such as a roof gyro or rotatable spray arms, for spraying washware with washing liquor and / or fresh water.

EP 3 254 600 A1 shows a dishwasher with a washing container and a spray arm rotatably mounted on a washing container of the dishwasher. The spray arm comprises a large number of spray nozzles, to which rinsing liquor is supplied by means of flow control elements.

EP 2 397 060 A2 describes a dishwasher with a spray device, comprising a deflector which is set up to deflect the washing liquor directed onto it in order to generate a variable spray pattern.

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

Accordingly, a household dishwasher is proposed. The household dishwasher comprises a washing container and at least one spray device arranged inside the washing container for spraying washing liquor and / or fresh water in the washing container, the spraying device having a nozzle for spraying the washing liquor and / or fresh water and a spiral-shaped flow guide element for supplying the Rinsing liquor and / or the fresh water to the nozzle includes. The spiral flow guiding element is designed to supply the washing liquor and / or the fresh water to the nozzle in the operation of the spray device such that the washing liquor and / or the fresh water emerges from the nozzle as a rotating cone spray jet.

The fact that the washing liquor and / or the fresh water emerges from the nozzle as a rotating cone spray jet means that items to be washed located in the washing container can be particularly good be wetted with the washing liquor and / or the fresh water, since a chaotic spray image can be generated. This improves the cleaning performance of the household dishwasher.

The spray device can, for example, be fixedly attached to the washing container, to a spray arm that is rotatably mounted in the washing container, or to a washware receptacle taken up in the washing container. In particular, the spray device can also be provided on a floor or a ceiling of the washing compartment. Vorzugswei se a variety of spray devices is provided. In the present case, a “cone spray jet” is to be understood as a spray jet which has a conical outer surface. The cone spray emerges from the nozzle at a defined exit angle. The fact that the cone spray jet “rotates” means in the present case in particular that the cone spray jet rotates about an axis of rotation or axis of rotation when it emerges from the nozzle.

According to one embodiment, the spiral flow guiding element is designed in the form of an Archimedean spiral or in the form of a logarithmic spiral.

Depending on the choice of the direction of rotation of the wash liquor and / or the fresh water from the nozzle, both left-handed and right-handed spiral geometry can be selected. Under "left-handed" in the present case, in particular, an anti-clockwise direction of rotation of the spiral flow guide element is to be understood. In the present case, “right-handed” is to be understood in particular to mean that the spiral-shaped flow guide element winds in a clockwise direction. The term "left-handed" can also be replaced by the terms "left-handed" or "curved to the left". Accordingly, the term "right-handed" can be replaced by the terms "clockwise" or "curved to the right". A respective direction of curvature of the spiral flow guide element is thus equated with the smoothness of the spiral flow guide element. That is to say, in the event that the spiral flow guide element is left-handed, it has, in particular, a left-hand curved curvature. Accordingly, in the event that the spiral flow guide element is right-handed, it has a curvature direction that is curved in particular to the right. The aforementioned exit angle of the cone spray from the nozzle can be changed by changing the distance of a wall of the spiral flow guide element can be influenced to a center of the respective nozzle. A distance from the center of a logarithmic spiral changes by the same factor with each revolution. If this factor is selected to be very small, the exit angle can be reduced. Conversely, the exit angle can be increased if the factor is increased. When using an Archimedean spiral, the distance can be made variable if a spiral radius is increased or decreased accordingly.

According to a further embodiment, the spray device has a rotatably mounted gyro element which can be acted upon by the washing liquor and / or the fresh water during operation of the spray device in order to set the gyro element in rotation.

The fact that the gyroscope element can be "impinged upon" with the washing liquor and / or the fresh water means that the gyroscope with the washing liquor and / or the fresh water flows against it during operation of the spraying device, as a result of which the gyro element rotates about an axis of rotation set in rotation. The fact that the rinsing liquor and / or the fresh water emerges from the nozzle as a rotating cone spray jet means that a drive torque acting on the gyro element can be increased, since the cone spray jet not only strikes a hub but also on blades of the circle l element.

According to a further embodiment, the gyro element has blades, where a direction of curvature of the blades coincides with a direction of curvature of the spiral flow element.

In the event that the blades are curved to the left, the spiral flow guide element also comprises a left curved direction of curvature or the spiral flow guide element is left-handed. In the event that the blades are curved to the right, the spiral flow guide element also has a direction of curvature oriented to the right or the spiral flow guide element is right-handed. With the help of the identical curvature directions, the drive torque acting on the gyro element can be increased again. This further improves the spray pattern. According to a further embodiment, the gyro element is taken up in a cage and rotatably supported in this.

The cage preferably has a plurality of struts which are connected to one another and which are connected to a housing of the spraying device, for example snapped or locked. The webs meet at a connecting section which has a bore in which the hub of the gyroscopic element is rotatably mounted.

According to a further embodiment, the domestic dishwasher further comprises an intensive zone which has a plurality of spray devices.

A plurality of such intensive zones are preferably provided. The intensive zones can, for example, be fastened to the washware receptacles of the household dishwasher. For example, each intensive zone has three such spray devices. However, the number of spray devices is arbitrary.

According to a further embodiment, the intensive zone has a valve in order to bring the intensive zone from an active state into an inactive state and vice versa.

The valve is preferably a manually operated valve. For example, the valve can have a valve body which can be moved linearly from the active state to the inactive state and vice versa in order to move the spray device.

According to a further embodiment, the intensive zone has a housing on or in which the spiral flow guide elements are molded.

The housing is preferably a plastic component. The housing can, for example, have a base and a cover, which are firmly connected to one another. Preferably, the spiral flow guide elements of the spray devices are formed on the lid. According to a further embodiment, the household dishwasher further comprises a spray arm which is rotatably mounted in the washing container and which has a plurality of spraying devices.

In particular, several spray arms can also be provided. The spray arms are provided, for example, on the items to be washed, on the ceiling of the washing container or on the bottom of the washing container.

According to a further embodiment, the spiral-shaped flow guide elements of adjacent spraying devices have mutually different curvature directions.

The spray devices are preferably arranged such that a right-handed spiral flow guide element is arranged between two left-hand spiral flow guide elements and vice versa. This can further improve the wetting effect. The spiral flow guide elements can also have identical directions of curvature.

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.

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 top view of an embodiment of an intensive zone for the domestic dishwasher according to FIG. 1;

FIG. 3 shows a schematic bottom view of the intensive zone according to FIG. 2;

Fig. 4 shows a schematic sectional view of the intensive zone according to the section line IV-IV of Fig. 2;

Fig. 5 shows a schematic view of an embodiment of a spiral flow guiding element for the intensive zone according to Fig. 2;

FIG. 6 shows a schematic view of a further embodiment of a spiral-shaped flow guide element for the intensive zone according to FIG. 2;

FIG. 7 shows a schematic view of a further embodiment of a spiral-shaped flow guide element for the intensive zone according to FIG. 2;

8 shows a schematic sectional view of a further embodiment of an intensive zone for the domestic dishwasher according to FIG. 1;

FIG. 9 shows a schematic sectional view of an embodiment of a spray arm for the domestic dishwasher according to FIG. 1;

Fig. 10 shows a further schematic sectional view of the spray arm according to the section line X-X of Fig. 9; and

1 1 shows a schematic sectional view of a further embodiment of a spray arm for the domestic 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.

FIG. 1 shows a schematic perspective view of an embodiment of a domestic dishwasher 1. The domestic dishwasher 1 comprises one Rinsing container 2, which can be closed by a door 3, in particular watertight. 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 Ge of the household dishwasher 1. The washing compartment 2 and the door can form a washing compartment 4 for washing items to be washed.

The door 3 is shown in its open position in FIG. 1. 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 rinsing container 2 has a bottom 7, a ceiling 8 arranged opposite the bottom 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, for example three, washware receptacles 12 to 14 can be provided, the washware receptacle 12 being a lower washware receptacle or a lower basket, the washware receptacle 13 an upper washware receptacle or an upper basket and the washware receptacle 14 being a cutlery drawer. 1 also shows, the washware receptacles 12 to 14 are one above the other in the washing container 2 angeord net. Each washware receptacle 12 to 14 can either be moved into or out of the washing tub 2. In particular, each washware receptacle 12 to 14 can be inserted or retracted in a direction of insertion E into the washing container 2 and can be pulled out or withdrawn from the washing container 2 in a pull-out direction A against the direction of insertion E.

FIG. 2 shows a schematic top view of an intensive zone 15. FIG. 3 shows a schematic bottom view of the intensive zone 15 and FIG. 4 shows a schematic sectional view of the intensive zone according to the section line IV-IV of FIG. 2 2 to 4 referred to simultaneously. The intensive zone 15 is arranged inside the washing compartment 2. In particular, several such intensive zones 15 can be provided within the washing compartment 2. However, only one intensive zone 15 is referred to below. The intensive care zone

15 can for example be releasably or non-releasably connected to one of the washware receptacles 12 to 14. Furthermore, the intensive zone 15 can also be provided on the floor 7, the ceiling 8, the rear wall 9 or on one of the side walls 10, 11. The intensive zone 15 can be attached to the washing compartment 2 or the respective washware receptacle 12 to 14 in such a way that it can be separated again from the washing tub 2 or the washware receptacle 12 to 14. For example, the intensive zone 15 can be clipped onto the respective washware receptacle 12 to 14 or locked with it. The household dishwasher 1 can thus be modularly equipped with one intensive zone 15 or with several intensive zones 15.

The intensive zone 15 comprises a housing 16 with a base 17, which is not shown in FIG. 3, and a cover 18. The base 17 and the cover 18 are connected to one another with the aid of a connecting element 19. The housing 16 comprises the connecting element 19. For example, the bottom 17, the cover 18 and the connecting element 19 are glued or welded to one another.

Furthermore, the housing 16 comprises a coupling element 20, by means of which the intensive zone 15 is detachably connected to a feed pipe, not shown, of the domestic dishwasher 1. For example, in the event that the intensive zone 15 is provided on one of the washware receptacles 12 to 14, the coupling element 20 when the washware receptacle 12 is pushed in in the insertion direction E into the washing tub 2 with the feed pipe, and when pulled out the washware receptacle 12 to 14 in the pull-out direction A, the coupling element 20 is separated again from the feed pipe. With the help of the coupling element 20, the intensive zone 15 can thus be supplied with washing liquor and / or fresh water F during operation of the domestic dishwasher 1.

Furthermore, the housing 16 comprises a feed line 21 which is provided downstream of the coupling element 20. Furthermore, the intensive zone 15 can be on the housing

16 include provided valve 22, which can be switched manually, for example, in order to activate and deactivate the intensive zone 15. The coupling element 20, the supply device 21 and the valve 22 can be connected to the cover 18 of the housing 16 in one piece, in particular in one piece. The valve 22 comprises a valve body, not shown, which is movable in order to activate and deactivate the intensive zone 15.

The intensive zone 15 comprises a plurality of spray devices 23 to 25. The number of spray devices 23 to 25 is arbitrary. For example, three such spraying devices 23 to 25 can be provided. The spray devices 23 to 25 can also be seen individually on the inside on the washing container 2 or on the washware receptacles 12 to 14. This means that the spray devices 23 to 25 are not necessarily assigned to an intensive zone 15 as explained above.

Each spray device 23 to 25 comprises a gyro element 26 which is rotatably mounted in a cage 27 about an axis of rotation R (FIG. 4). The rotor element 26 comprises a plurality of, for example three, rotor blades 28 to 30. The rotor blades 28 to 30 are connected to one another with the aid of a connecting ring 31 running around the rotor element 26. Furthermore, the rotor blades 28 to 30 are connected to one another with the aid of a hub 32 which is rotatably mounted on the cage 27.

The cage 27 comprises a plurality of struts 33 to 35 which are connected to the cover 18. For example, the struts 33 to 35 are snapped or snapped into the cover 18. Alternatively, the struts 33 to 35 can also be formed in one piece, in particular in one piece with the cover 18. The number of struts 33 to 35 is arbitrary. For example, three such struts 33 to 35 are provided, which are positioned at an angle of 120 ° to one another. As shown in FIG. 4, a locking element 36 can be provided at the ends of the ends 33 to 35, which is snapped or locked into an opening 37 of the cover 18. The struts 33 to 35 meet on egg NEM bearing portion 38 which has a bore 39 in which the hub 32 of the Kreiselele element 26 is rotatably mounted.

The spray devices 23 to 25 are preferably constructed identically. As FIG. 3 also shows, the spray devices 23 to 25 each comprise a nozzle 40 to 42. That is, each spray device 23 to 25 is assigned a nozzle 40 to 42. The nozzles 40 to 42 are suitable for spraying the washing liquor and / or the fresh water F in the washing container 2. Each spray device 23 to 25 is also assigned a spiral flow guide element 43 to 45 shown in FIG. 3. With the aid of the spiral flow guide elements 43 to 45, the washing liquor and / or the fresh water F is fed to the respective nozzle 40 to 42. The spiral flow guide elements 43 to 45 can be right-handed or left-handed. "Right-handed" means clockwise curved. "Left-handed" means counter-clockwise curved. As shown in FIG. 3, the spiral flow elements 43 to 45 are right-handed. That is, the rinse liquor and / or the fresh water F is fed clockwise to the respective nozzle 40 to 42.

The spiral flow guide elements 43 to 45 can, as shown in FIG. 5, each be designed as a logarithmic spiral. 5, the spiral flow guide element 43 is designed as a left-handed logarithmic spiral. A logarithmic spiral is a spiral in which, with each revolution around its center, a distance a (FIG. 7) from this center changes by the same factor. A radius of the logarithmic spiral thus grows in proportion to an arc or spiral length of the spiral. As previously mentioned, the spiral flow guide 43 can also be right-handed.

As FIG. 6 shows, the spiral flow guide elements 43 to 45 can, however, also each be designed as an Archimedean spiral. 6, the spiral-shaped flow guide element 43 is designed as a left-handed Archimedean spiral. An archimedical spiral arises when a radius of the spiral grows in proportion to its angle of rotation during a rotary movement.

The functionality of the intensive zone 15 or the spray device 23 to 25 is explained below. Because each spray device 23 to 25 is assigned a spiral-shaped flow guide element 43 to 45, the washing liquor and / or the fresh water F exits from the nozzles 40 to 42 in the form of a rotating cone spray jet 46 (FIG. 4). The cone spray jet 46 strikes the gyro element 26 and sets it in rotation about the axis of rotation R. Here, an outlet direction of rotation of the washing liquor and / or the fresh water F from the respective nozzle 40 to 42 is dependent on the current speed of the spiral flow guide elements 43 to 45 preferably equal to a rotary device of the gyro element 26 selected. As a result, a higher drive torque can be applied to the gyro element 26. Furthermore, the blades 28 to 30 and not only the hub 32 can be directly flowed through by generating the Ke spray spray 46, whereby the drive torque is increased again. The gyro element 26 is more compatible with dirt and less susceptible to blockages.

An exit angle a (FIG. 4) of the conical spray jet 46 which occurs during operation of the intensive zone 15 or of the spray devices 23 to 25 can, as shown in FIG. 7 with the aid of a left-handed logarithmic spiral, by changing the aforementioned distance a of the spiral flow guide element 43 to a center point of the respective nozzle 40 to 42 or the respective spiral flow guide element 43 to 45 are influenced. The distance a from the center of the nozzle 40 or of the spiral flow guide element 43 changes with each revolution of the spiral flow guide element 43 by the center by the same factor. If this factor is chosen to be very small, the exit angle α can be reduced. Conversely, the exit angle α can be increased if the aforementioned factor is increased.

When an Archimedean spiral is used for the spiral flow guide element 43, on the other hand, the distance a can be made variable if a radius of the spiral flow guide element 43 is increased or decreased accordingly. That is, the further a wall of the spiral flow guide element 43 is arranged away from the nozzle 40, the greater the exit angle α.

8 shows a schematic sectional view of a further embodiment of an intensive zone 15. In this embodiment of the intensive zone 15, the spray devices 23 to 25 comprise neither a gyro element 26 nor a cage 27. That is, the rotating cone spray jet 46 emerges from the nozzle 40 without hitting the gyro element 26. The functionality remains otherwise identical.

FIG. 9 shows a schematic sectional view of an embodiment of a spray arm 47 for the domestic dishwasher 1. FIG. 10 shows a further schematic sectional view of the spray arm 47 according to the section line XX of FIG. 9. 11 shows a schematic sectional view of a further embodiment of a spray arm 47. In the following, reference is made to FIGS. 9 to 11 simultaneously.

The spray arm 47 is rotatably mounted in the washing container 2. For example, the spray arm 47 can be fastened on the underside to one of the items to be washed 12 to 14, to the ceiling 8 or to the bottom 7 of the washing container 2. A plurality of such spray arms 47 are preferably provided. The spray arm 47 comprises a plurality of spray devices 23 to 25, as explained above, of which only three are shown in FIGS. 9 to 11 with a reference number.

As shown in FIG. 10, as previously explained, each spray device 23 to 25 is assigned a nozzle 40 to 42 and a spiral flow guide element 43 to 45. In the imple mentation form of the spray arm 47 according to FIGS. 9 and 10, all spiral flow guiding elements are right-handed. In the embodiment of the spray arm 47 according to FIG. 11, the spiral flow guide elements 43 to 45 are alternately clockwise and counterclockwise. In the embodiment of the spray arm 47 according to FIGS. 9 and 10, an outlet direction of rotation of the rinsing liquid and / or the fresh water F is effected in a clockwise direction on all nozzles 40 to 42.

In the embodiment of the spray arm 47 according to FIG. 11, on the other hand, the wash liquor te and / or the fresh water F emerges alternately clockwise and counterclockwise. With an appropriate arrangement of the nozzles 40 to 42 and the design of the exit angle a of the cone spray jet 46, seamless, direct wetting of the washware can be achieved compared to known concentric spray jet circular paths.

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

1 household dishwasher

2 rinsing tanks

3 door

4 washroom

5 swivel axis

6 loading opening

7 floor

8 blanket

9 rear wall

10 side wall

11 side wall

12 Washware intake

13 Washware intake

14 Washware intake

15 intensive zone

16 housing

17 floor

18 lid

19 connecting element

20 coupling element

21 supply line

22 valve

23 spraying device

24 spraying device

25 spraying device

26 gyro element

27 cage

28 moving blade

29 moving blade

30 blade

31 connecting ring

32 hub 33 strut

34 strut

35 strut

36 locking element

37 opening

38 storage section

39 hole

40 nozzle

41 nozzle

42 nozzle

43 flow control element

44 flow guiding element

45 flow guiding element

46 cone spray

47 Spray arm a distance

A Extension direction

E direction of insertion

F Rinse liquor and / or fresh water

R axis of rotation

a exit angle

Claims

PATENT CLAIMS

1. Household dishwasher (1) with a washing container (2) and at least one inside the washing container (2) arranged spray device (23-25) for spraying washing liquor and / or fresh water (F) in the washing container (2), the Sprüheinrich device (23 - 25) a nozzle (40 - 42) for spraying the washing liquor and / or the fresh water (F) and a spiral flow guide element (43 - 45) for supplying the washing liquor and / or the fresh water (F) of the nozzle (40-42), and wherein the spiral flow guide element (43-45) is set up to operate the spraying device (23-25), the washing liquor and / or the fresh water (F) of the nozzle (40-42 ) to be fed in such a way that the washing liquor and / or the fresh water (F) emerges from the nozzle (40 - 42) as a rotating cone spray jet (46).

2. Household dishwasher according to claim 1, characterized in that the spiral flow guide element (43 - 45) is designed in the form of an Archimedean spiral or in the form of a logarithmic spiral.

3. Household dishwasher according to claim 1 or 2, characterized in that the spray device (23-25) has a rotatably mounted gyroscopic element (26) which, during operation of the spray device (23-25) with the washing liquor and / or the

Fresh water (F) can be acted upon in order to set the gyroscopic element (26) in rotation.

4. Household dishwasher according to claim 3, characterized in that the gyro element (26) has blades (28-30), wherein a direction of curvature of the blades (28-30) corresponds to a direction of curvature of the spiral flow guide element (43-45).

5. Household dishwasher according to claim 3 or 4, wherein the gyroscopic element (26) is accommodated in a cage (27) and is rotatably mounted therein.

6. Household dishwasher according to one of claims 1-5, further comprising an intensive zone (15) which has a plurality of spray devices (23-25).

7. Household dishwasher according to claim 6, characterized in that the intensive zone (15) has a valve (22) to move the intensive zone (15) from an active state to an inactive state and vice versa.

8. Household dishwasher according to claim 6 or 7, characterized in that the intensive zone (15) has a housing (16) on or in which the spiral

Flow guide elements (43 - 45) are integrally formed.

9. Household dishwasher according to one of claims 1-8, further comprising a spray arm (47) rotatably mounted in the washing container (2) and having a plurality of spray devices (23-25).

10. Household dishwasher according to claim 9, characterized in that the spiral flow guide elements (43-45) of adjacent spray devices (23-25) have mutually different directions of curvature.