EP2601878B1 - Dishwasher with automatic reversal of the direction of rotation of the spray arm - Google Patents

Description

The invention relates to a dishwasher having a washing compartment and a spray system provided in the washing compartment, which has a rotatably mounted spray arm, wherein the spray arm drive nozzles, which drive nozzles serve a rotary drive of the spray arm in the left direction on the one hand and in the right direction on the other.

Dishwashers of the type mentioned are known from the prior art per se. A separate documentary proof is therefore not required at this point.

Generic dishwashers have a Spülbottich, which in turn provides a Spülraum. The washing compartment is accessible via an opening in the washing tub, which opening can be closed in a fluid-tight manner by means of a door pivotably arranged on the washing tub.

When used as intended, the washing compartment of the dishwasher serves to receive items to be cleaned. This is applied as part of a designated Spülprogrammablaufs by means of rinsing liquid, the so-called wash liquor.

A dishwashing machine has a spray system provided in the washing compartment for loading items to be cleaned with washing liquor. Such a system typically has at least one rotatably mounted spray arm. In general, several such spray arms are provided, and depending on the design of the dishwasher two or three spray arms are common practice.

Each spray arm is connected to a supply line for rinsing water. In this case, rinsing liquor passes through this supply line to the spray arm, via which the rinsing liquor is discharged in the direction of the items to be cleaned. The rinsing liquor emitted by the spray arm collects in the washing compartment and is guided in an open flow circuit for a renewed spraying of the dishes. For this purpose, a circulation pump is used, which continuously circulates the rinsing liquor during a proper program implementation.

Typically, in a dishwasher of the type mentioned above, not all the spray arms are used at the same time in a designated program sequence. It is rather a feed to different sections of the program different spray arms with rinsing liquor instead, for the purpose of water saving preferably not more than two spray arms are operated simultaneously with rinsing water. For feeding different spray arms with rinsing fluid, a water switch cooperating with the circulation pump is regularly used, wherein a feeding of the spray arms takes place as a function of the position of the water distributor.

For the purpose of the rotary drive of the spray arm it has drive nozzles. The DE 3816408 A1 discloses a dishwasher in which drive nozzles are provided for a rotary drive of the spray arm in the left direction and drive nozzles for a rotary drive of the spray arm in the right direction. "Left direction" means a drive of the spray arm in the counterclockwise direction and "right direction" in the opposite direction, ie in the clockwise direction. The respective drive nozzles are connected to two separate channels in the spray arm, which are supplied via two separate supply lines with rinsing liquid. The supply lines are connected to separate output connections of the water separator.

The DE 103 55 343 B3 discloses a dishwashing machine in which a spray arm has two groups of nozzles. These are in fluid communication with a distribution chamber provided by the spray arm. When used as intended, rinse liquor flows into the distribution chamber of the spray arm, from where one or the other nozzle group is operated with rinsing liquor. The feeding of the nozzle groups with rinsing liquor takes place purely by chance via a ball present in the distribution chamber. When loading the spray arm with rinsing fluid, this ball is spent independently of control and completely randomly in a position in which either one nozzle group or the other nozzle group is released or locked. A targeted feeding of one or the other nozzle group with rinsing liquor is not possible.

The DE 1265366 B discloses a dishwasher with a rotatably mounted spray arm. This has a distribution chamber, which are fluidly connected via a first opening with drive nozzles, which are connected to a rotary drive of the spray arm in the left direction, and via a second opening fluidly with drive nozzles, which serve a rotary drive of the spray arm in the right direction. The openings can be closed by a ball.

It is based on the above, the object of the invention to further develop a dishwasher of the type mentioned in that a improved coverage of the washing compartment with rinsing liquor is achieved with the aim of improved Spülgutreinigung at the same time simplified, inexpensive and robust construction.

To solve this problem, the invention proposes a dishwasher with the features of claim 1.

The dishwasher according to the invention has a spray arm, which is equipped with a distribution chamber and a control. The distribution chamber is thus arranged within the spray arm and is supplied with rinsing liquid via only one supply line. The control is movably disposed within the distribution chamber of the spray arm. Depending on its positioning within the distribution chamber, there are alternately free either the drive nozzles for a rotary drive of the spray arm in the left direction or the drive nozzles for a rotary drive of the spray arm in the right direction. Advantageously, it comes with every new loading of the spray arm with rinsing water to a reversal of direction. Thus, if a twisting movement of the spray arm has taken place, for example, in the left-hand direction in a preceding program section, a twisting movement of the spray arm in the right-hand direction will be carried out after completion of this program section and subsequent recharge of the spray arm with wash liquor. The design according to the invention therefore yields a reversing upon each new loading of the spray arm with rinsing liquor, d. H. a sense of direction alternating in its direction of rotation.

Due to the alternating direction of rotation of the spray arm, different wash liquor jet directions, incidence angles and / or wash liquor jet shapes result with regard to the items to be washed picked up by the dishwasher's dishwasher compartment from the reversal of the direction of rotation to the reversal of the direction of rotation. Due to this, an optimized coverage of the washing compartment sets by different spray patterns, which results in an advantageous result to an improved cleaning result.

In dishwashers of the type mentioned initially typically a plurality of spray arms are used, each acting in a spray level. The requirements for the spray jet characteristic of a spray arm can change during a program run. The same applies to the realization of different washing programs or rinsing phases, such. B. Fine program, pot cleaning program, sieve cleaning program and the like. For this reason, the spray jet characteristic of the spray arms of previously known dishwashers represents a compromise that meets as many requirements as possible.

The embodiment of the invention provides an improvement here, as a result of a reversal of the direction of rotation of the spray arm with respect to the items to be cleaned a beam direction change, a beam shape change as well as a change in the Strahlauftreffwinkel causes, so that different Sprühstrahlcharaktistiken are reached. As a result, a better cleaning result can be achieved.

The recorded by the distribution chamber control allows in contrast to the embodiment of the DE 103 55 343 B3 a targeted, namely alternately closing the drive nozzles for a left-hand rotation of the spray arm on the one hand and a clockwise rotation of the spray arm on the other. Thus, in contrast to the prior art no random loading of the corresponding drive nozzles with rinsing liquor.

The control is according to a further feature of the invention, a ball. This serves as a closure means, wherein it closes the fluidic connection between the distribution chamber and the corresponding drive nozzles in the closed position. If the ball is not in its closed position, the fluidic connection between the corresponding drive nozzles and the distribution chamber of the spray arm is released.

The distribution chamber provides an annular space according to another feature of the invention. For this purpose, the distribution chamber of circular cross-section is equipped with a mandrel, preferably extending in the vertical direction of the axis of rotation of the spray arm. The ball is positively constrained within the annulus and is free to move around on the annular path provided by the annulus about the mandrel formed centrally in the distribution chamber. Further, in particular within the distribution chamber movable elements are not required for the closure and the activation of the fluidic connections to the drive nozzles. This ensures a comparatively simple and robust construction of the spray arm. The advance arrangement of the annulus around the axis of rotation of the spray arm avoids imbalance of the spray arm, which could limit the stability and longevity of the system.

The spray arm has two wings, each extending from the distribution chamber. Each wing provides a main channel and at least one secondary channel, preferably each wing provides a main channel and a first secondary channel and a second secondary channel. As a result, a particularly symmetrical structure can be achieved in a simple manner. The two first side channels of the wings and the two second side channels of the wings preferably each form a continuous secondary channel. Each of the secondary channels is connected to at least one drive nozzle. Typically, each of the secondary channels, in particular each of the first and second sub-channels exactly one drive nozzle, which is arranged in particular at its distal end.

When feeding the spray arm with rinsing liquor, it always flows into both wings of the spray arm, in particular always into the main duct as well as into one of the two auxiliary ducts. Simultaneous feeding of both secondary channels or in both secondary channels of a wing of the spray arm with rinsing water does not take place.

The main channel is connected to a plurality of spray nozzles. In the feed case, rinsing liquor is introduced into the washing compartment of the dishwasher in the direction of the items to be cleaned. The secondary channels meanwhile serve to feed the drive nozzles for the purpose of rotating the spray arm. In this case, a feed of a secondary channel causes a rotational movement of the spray arm in the left direction, whereas a feed of the other secondary channel leads to a rotational movement of the spray arm in the right direction. The position of the control within the distribution chamber, i. In this case, the ball within the annular space determines which secondary channel is charged with flushing solution in the charging case or which secondary channel is fluidically decoupled from the distribution chamber. In contrast, the main channel of both wings and the spray nozzles connected thereto are always, i. irrespective of the position of the control element, and thus in particular irrespective of the direction of rotation of the spray arm determined thereby, is supplied with rinsing liquor.

According to a preferred embodiment, a rotatably mounted spray arm of the dishwasher according to the invention comprises a distribution chamber and two vanes each extending from the distribution chamber, each wing having a main duct connected to a plurality of spray nozzles and at least one side duct via which the drive nozzles are fluidically connected to the distribution chamber; the spray arm further comprises a control disposed movably within the distribution chamber, which alternately releases either the drive nozzles for a rotary drive of the spray arm in the left direction or the drive nozzles for a rotary drive of the spray arm in the right direction, wherein the spray nozzles to which a main channel is connected independently are released from the positioning of the control. The distribution chamber provides, as described above, an annular space in which the ball-shaped control element is forcibly guided.

According to a further embodiment, the annulus provided by the distribution chamber has a bottom surface which is formed divided into two sections. In this case, the two sections on a respective slope, which in run in the opposite direction. Due to this gradient of the two sections, which are formed in the opposite direction, the sections merge into one another with the respective formation of a step.

For the purpose of the fluidic connection of the two secondary channels to the distribution chamber, an overflow opening, also called channel opening, is provided per secondary channel. The steps provided by the bottom surface of the annulus between the two bottom surface portions are radially offset from the two oppositely formed overflow openings arranged.

• Die als Steuerelement dienende Kugel liegt an einer der beiden Stufen des Ringraumbodens an. Bei einer Beschickung der Verteilkammer mit Spülflotte wird die Kugel über diese Stufe gehoben, infolgedessen sie in die dieser Stufe zugeordnete Überströmungsöffnung hinein bugsiert wird. Es kommt so zu einem Verschluss dieser Überströmungsöffnung, womit der zugehörige Nebenkanal strömungstechnisch von der Verteilkammer entkoppelt wird. Der andere Nebenkanal ist strömungstechnisch mit der Verteilkammer verbunden, so dass in diesen Spülflotte einströmen kann.

The construction described above causes a sequence in the intended use case as follows:

• The serving as a control ball abuts one of the two stages of the annular space floor. When loading the distribution chamber with rinsing fluid, the ball is lifted above this stage, as a result of which it is guided into the overflow opening assigned to this stage. It thus comes to a closure of this overflow opening, whereby the associated secondary channel is fluidically decoupled from the distribution chamber. The other secondary channel is fluidically connected to the distribution chamber, so that it can flow into this wash liquor.

As soon as the feed of the spray arm ends with wash liquor, the ball is no longer held in the overflow opening and falls out of this following the gravity. Since the step associated with this overflow opening is radially offset from the overflow opening, the ball falls onto the next section of the floor surface, where it rolls down the slope of this section until the next step is reached. At this stage, the ball remains until a renewed loading of the spray arm with rinsing liquor.

When the spray arm is recharged with rinsing liquor, the ball is lifted due to the inflowing rinsing liquor and conducted via the stage into the overflow opening assigned to this stage. As a result, it comes in comparison to the previous loading of a side channel now to feed the other side channel with rinsing liquor. As a result, this sets a change of direction with respect to the spray arm.

The construction according to the invention thus results in a result in constantly changing drive direction with respect to the spray arm. Each new loading of the spray arm with rinse liquor changes its direction of rotation.

Figur 1

in schematischer Draufsicht von oben einen Sprüharm nach der Erfindung;

Figur 2

in einer geschnittenen Detaildarstellung den Sprüharm nach Figur 1 gemäß Schnittlinie A - A gemäß einer ersten Betriebsstellung;

Figur 3

in einer geschnittenen Detaildarstellung den Sprüharm nach Figur 1 gemäß Schnittlinie A - A gemäß einer zweiten Betriebsstellung;

Figur 4

in einer geschnittenen Detaildarstellung den Sprüharm nach Figur 1 gemäß Schnittlinie A - A gemäß einer dritten Betriebsstellung;

Figur 5

in einer schematischen Draufsicht von oben ausschnittsweise den Sprüharm nach der Erfindung;

Figur 6

in teilgeschnittener Detaildarstellung den Sprüharm nach Figur 5 gemäß Schnittlinie B - B;

Figur 7

in teilgeschnittener Detaildarstellung den Sprüharm nach Figur 5 gemäß Schnittlinie B - B gemäß einer ersten Betriebsstellung;

Figur 8

in einer geschnittenen Darstellung in Längsrichtung den Sprüharm nach der Erfindung und

Figur 9

in perspektivischer Darstellung den Ausschnitt nach Figur 8.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. Showing:

FIG. 1

a schematic top view of a spray arm according to the invention;

FIG. 2

in a cut detail of the spray arm after FIG. 1 according to section line A - A according to a first operating position;

FIG. 3

in a cut detail of the spray arm after FIG. 1 according to section line A - A according to a second operating position;

FIG. 4

in a cut detail of the spray arm after FIG. 1 according to section line A - A according to a third operating position;

FIG. 5

in a schematic plan view from above fragmentary the spray arm according to the invention;

FIG. 6

in partial cut detail after the spray arm FIG. 5 according to section line B - B;

FIG. 7

in partial cut detail after the spray arm FIG. 5 according to section line B - B according to a first operating position;

FIG. 8

in a longitudinal sectional view of the spray arm according to the invention and

FIG. 9

in perspective the section after FIG. 8 ,

FIG. 1 can be seen in schematic plan view from above a spray arm 1 according to the invention. Such a spray arm 1 is part of an otherwise not shown spray system of a dishwasher, also not shown otherwise.

A dishwasher has a Spülbottich, which in turn provides a dishwasher. In the intended use case of the dishwasher, the washing compartment serves to receive items to be cleaned. Within the Spülraums a spray system is provided, which serves the delivery of rinsing liquid, the so-called rinsing liquor.

Such a spraying system also includes a spray arm 1, which is arranged rotatably within the washing compartment of the dishwasher, as it is in FIG FIG. 1 is shown. Typically, several such spray arms 1 are provided, which in the height direction of the Rinsing space are arranged one above the other and can be charged independently with rinsing liquor.

The spray arm 1 embodied according to the invention has the first wing 2 and a second wing 3, which extend from a distribution chamber 14. The distribution chamber 14 is provided on the upper side with a connection opening 26. It is used for connection to a supply line not shown in the figures, via which, in the intended use case, a loading of the spray arm 1 with rinsing liquor.

The two wings 2 and 3 each have a main channel 4 and two secondary channels 6 and 7. In this case, each wing 2 and 3 of the respective main channel 4 and the respective secondary channels 6 and 7 are fluidically connected to the distribution chamber 14.

With a feed of the spray arm 1 with rinse liquor passes through the connection opening 26 in the distribution chamber 14 of the spray arm 1. From there, the rinse liquor enters the two main channels 4 of the wings 2 and 3 and in one of the two side channels 6 or 7. A simultaneous Feeding the two secondary channels 6 and 7 with rinsing does not take place.

The secondary channels 6 and 7 have at their opposite end of the distribution chamber 14 via drive nozzles 8 and 9, wherein the first secondary channel, the drive nozzles 9 and the second secondary channel 7, the drive nozzles 8 are assigned.

When loading the first secondary channel 6 with rinsing liquor, the rinsing liquor reaches the drive nozzles 9, from which the rinsing liquor emerge in the direction of the arrow 10 shown by dashed lines. As a result of this, the spray arm 1 mounted so as to be rotatable about the rotation axis 22 is set in a twisting motion, in the direction of the arrow 11 to the left, d. H. in a counterclockwise left turn.

With a loading of the second secondary channel 7 with rinsing liquor, this is passed to the drive nozzles 8, from which it emerges in correspondence of the arrow 12. As a consequence, there is a twisting movement of the spray arm in the direction of arrow 13 to the right, d. H. to a clockwise rotation.

The main channel 4 has spray nozzles 5. When feeding the spray arm 1 with rinse liquor, it passes via the distribution chamber 14 into the main channel 4 and from there to the spray nozzles 5, via which the rinse liquor is dispensed onto washware arranged in the dishwasher rinse compartment.

When used as intended, the spray arm 1 is charged with rinsing liquor. Rinse liquor is introduced into the main channel 4 for delivery via the spray nozzles 5. Furthermore, rinsing liquor is introduced into either the first sub-channel 6 or the second sub-channel 7, so that there is also an escape of rinsing water from the drive nozzles 8 or 9. As a result of this charging takes place with simultaneous delivery of rinsing fluid through the spray nozzles 5 either a left twisting movement of the spray arm 1 in the direction of arrow 11 or a Rechtsverdrehbewegung the spray arm 1 in the direction of arrow 13th

A loading of the first secondary channel 6 or the second secondary channel 7 with rinsing carried out in dependence on the position of the freely movable within the distribution chamber 14 ball 15. This cooperates either with the channel opening 16 or with the channel opening 18, wherein the channel opening 16, the fluidic connection between the distribution chamber 14 and the first sub-channel 6 and the channel opening 18, the fluidic connection between the distribution chamber 14 and the second sub-channel 7 is formed. In this case, each channel opening 16 or 18 distribution chamber side has a chamfer, which is designed to match the ball radius of the ball 15. This chamfer 17 therefore represents a ball seat, which forms a seal sealed for rinse tank when ball 15 is received. By means of the ball 15 can thus be made a closure of either the channel opening 16 or the channel opening 18, wherein in the closed state of the channel opening 16 is a feed of the second secondary channel 7 with rinsing and in the closed state of the channel opening 18, a feed of the first secondary channel 6 with rinsing ,

The distribution chamber 14 has the connection opening 26 opposite a bottom surface 20. From this bottom surface 20 rises in the direction of the axis of rotation 22, a mandrel 19. To this mandrel 19 around the ball 15 can move freely in the direction of arrow 21. Thus, an annular space is provided by the distribution chamber 14, wherein the ball 15 can move on the bottom surface 20 of the distribution chamber 14 rolling within this annulus.

How in particular a synopsis of FIGS. 5 to 9 results, the bottom surface 20 of the distribution chamber 14 is formed into two sections 23 and 24 divided. In this case, each of the two sections 23 and 24 is formed inclined, ie equipped with gradient, with the slope on the one hand, starting from the axis of rotation 22 in the direction of the adjoining the respective section 23 and 24 main channel 4 and on the other hand starting from the one channel opening 16th or 18 to the opposite channel opening 18 and 16, respectively. Thus, for example, the section 23 on a slope, which, starting from the axis of rotation 22 with respect to the plane of the drawing FIG. 8 to extends right and simultaneously, starting from the channel opening 16 in the direction of the channel opening 18, which is particularly apparent from the representation of the FIGS. 6 and 7 results. The slope of the portion 24 is formed in the reverse manner and extends on the one hand by the channel opening 18 in the direction of the channel opening 16 and on the other hand by the rotation axis 22 with respect to the plane of the drawing FIG. 8 to the left.

As a consequence of this section gradient results between the two sections 23 and 24 each have a step 25, which may also be referred to as a stop. The sections 23 and 24 are formed in their geometric dimensions such that the formed between the two sections 23 and 24 stages 25 at a radial angle to the axis of rotation 22 are stationary, as can be seen in particular from the illustration FIGS. 8 and 9 results.

The operation of the spray arm 1 designed according to the invention results in particular from the illustration according to FIGS FIGS. 2 to 4 ,

FIG. 2 indicates an operating situation, which takes place according to a loading of the spray arm 1 with rinsing liquor. In the operating position shown, the ball 15 is pressed into the ball seat of the channel opening 16, wherein it is held in this position due to the inflowing into the distribution chamber 14 rinse. Since the ball 15 closes the channel opening 16, the rinsing liquor flowing into the distribution chamber 14 enters the main channel 4 and the second secondary channel 7. As a result, flushing fluid is emitted via the spray nozzles 5 to a clockwise rotation in the direction of the arrow 13 (cf. FIG. 1 ), since in the second sub-channel 7, a feed of the drive nozzles 8 with rinsing liquor in correspondence of the arrow 12 (see. FIG. 1 ) takes place.

As soon as the supply with rinsing liquor stops, that is, there is an interruption of the charging of the distribution chamber 14 with rinsing liquor, the holding force exerted by the rinsing liquor on the ball 15 is eliminated. As a result, the ball 15 disengages from the channel opening 16 and, following gravity, rolls on the section 23 of the bottom surface 20 in the direction of the slope defined by the section 23 (cf. FIG. 8 ). In this case, the ball 15 comes to lie in front of the channel opening 18 in front of the formed between the two sections 23 and 24 stage 25. In this respect, this level 25 can also be referred to as a stop. The ball 15 is due to the geometric configuration of the stage 15 is not centered in front of the channel opening 18, but slightly off-center offset.

If it comes to a renewed loading of the spray arm with rinsing liquor, the ball 15 is lifted through the step 25 as a result of the inflowing rinsing fluid and due to the pressure exerted by the rinsing fluid, the ball 15 in the channel opening 18th towed. There is a closure of the channel opening 18 and the rinsing fluid flowing into the distribution chamber 14 now no longer enters the second secondary channel 7 but rather into the first secondary channel 6.

The release of the channel opening 16 with simultaneous closure of the channel opening 18 leads to a change of direction with respect to the spray arm 1, because the rinsing fluid flowing in via the distribution chamber 14 now reaches the drive nozzles 9 via the first auxiliary channel 6, which leads to a twisting movement of the Spray arm 1 in the left direction, d. H. in the direction of arrow 11 leads.

Upon renewed pressure drop within the distribution chamber 14, the ball 15 falls out of the channel opening 18 back out. However, since the step 25 is slightly offset from the channel opening 18, the ball 15 does not fall back on the section 23 but rather follows the slope provided by the section 24 to the opposite step 25 between the two sections 23 and 24, which step 25 from the representation after the FIGS. 8 and 9 results.

Upon renewed charging of the distribution chamber 14 with rinsing liquor, the ball 15 is lifted over this step 25 and inserted into the channel opening 16 for closing the same. Thus, the operating situation arises again, as in FIG. 2 is shown.

LIST OF REFERENCE NUMBERS

1

spray arm

2

wing

3

wing

4

main channel

5

spray nozzle

6

first secondary channel

7

second secondary channel

8th

drive nozzle

9

drive nozzle

10

arrow

11

Arrow (left turn)

12

arrow

13

Arrow (clockwise rotation)

14

distribution chamber

15

Bullet

16

channel opening

17

chamfer

18

channel opening

19

mandrel

20

floor area

21

arrow

22

axis of rotation

23

section

24

section

25

Stage (stop)

26

port opening

Claims (11)

1. Dishwasher comprising a washing chamber and a spray system which is provided in the washing chamber and comprises a rotatably mounted spray arm (1), the spray arm (1) comprising drive nozzles (8, 9), which drive nozzles (8, 9) are for rotationally driving the spray arm (1) in both a left direction and a right direction,
   the spray arm (1) comprising a distribution chamber (14), to which the drive nozzles (8, 9) are fluidically connected, and a control element which is arranged so as to be movable within the distribution chamber (14), is formed as a sphere (15) and alternately opens either the drive nozzles (9) for rotationally driving the spray arm (1) in the left direction or the drive nozzles (8) for rotationally driving the spray arm (1) in the right direction,
   characterised in that
   the distribution chamber (14) provides an annular space in which the sphere (15) is positively guided and can move around the rotational axis (22) of the spray arm (1) on an annular path provided by the annular space.
2. Dishwasher according to any of the preceding claims,
   characterised in that
   the spray arm (1) comprises two blades (2, 3), each of which extends out from the distribution chamber (14).
3. Dishwasher according to claim 2,
   characterised in that
   each blade (2, 3) comprises a main channel (4) and at least one additional channel (6, 7).
4. Dishwasher according to any of the preceding claims,
   characterised in that
   the spray arm (1) comprises at least two additional channels (6, 7), each of which is connected to at least one drive nozzle (8, 9).
5. Dishwasher according to any of the preceding claims,
   characterised in that
   the spray arm (1) comprises a main channel (4) which is connected to a plurality of spray nozzles (5).
6. Dishwasher according to any of the preceding claims,
   characterised in that
   the annular space provided by the distribution chamber (14) comprises a bottom surface (20) divided into two portions (23, 24).
7. Dishwasher according to claim 6,
   characterised in that
   the portions (23, 24) of the bottom surface of the annular space have an incline in the opposing direction.
8. Dishwasher according to either claim 6 or claim 7,
   characterised in that
   the portions (23, 24) of the bottom surface of the annular space transition into one another by each forming a step (25).
9. Dishwasher according to any of the preceding claims,
   characterised in that
   the annular space comprises two overflow openings (16, 18), by means of which the additional channels (6, 7) are fluidically connected to the distribution chamber (14).
10. Dishwasher according to claim 9,
    characterised in that
    the steps (25) formed between the portions (23, 24) of the bottom surface of the annular space are radially offset from the overflow openings (16, 18) that are formed opposite one another.
11. Dishwasher according to any of claims 3 to 10,
    characterised in that
    the spray nozzles (5), to which a main channel (4) is connected, are open irrespective of the position of the control element.

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