EP3545813A1 - Dishwasher, specifically domestic dishwasher - Google Patents

Abstract

The invention relates to a dishwasher, in particular a domestic dishwasher, with a washing compartment (3) providing a washing compartment (4) for receiving items to be cleaned, a collecting pot (5) into which the washing compartment (3) flows fluidically, and a circulating pump (9) which is fluidly connected to the collecting pot (5) by means of a suction line (10), wherein the circulation pump (9) is an axial pump, and a second suction line (19) is provided, by means of which the circulation pump (9) to the collecting pot (5) is fluidically connected.

Description

The invention relates to a dishwasher, in particular in the embodiment of a domestic dishwasher, with a washing compartment providing a washing compartment, which serves to receive items to be cleaned, a collecting pot, in which the washing fluidly opens and a circulation pump, the fluidically to the collecting pot by means of a suction line connected.

Dishwashers of the type described above are well known from the prior art, which is why a separate documentary proof at this point is not required. It is therefore only an example of the DE 10 2005 008 987 B3 directed.

Dishwashers of the generic type have a washing container, which provides a washing compartment. This washing compartment is accessible on the user side via a charging opening which can be closed in a fluid-tight manner by means of a pivotally mounted flushing door. In the intended use case, the washing container serves to receive items to be cleaned, which in the case of a domestic dishwasher may be, in particular, dishes, cutlery pieces and / or the like.

For loading of items to be cleaned with rinsing liquid, also called rinsing liquor, the dishwasher has a scavenging chamber side formed spray. This spraying device generally provides rotatably mounted spray arms, with typically two or three such spray arms being provided. In the intended use case, a loading of the items to be cleaned with rinse liquor by means of rotating spray arms.

In order to supply the spray arms with rinsing liquor, a circulating pump is provided, which is fluidly connected on the one hand to the collecting pot and on the other hand to the spray arms.

When used as intended, that of the sprayer collects discharged rinsing liquor in the collecting pot, in which the washing fluid flows out. In recirculation mode, the circulating pump conveys the rinsing liquor accumulating in the collecting pot to the spray arms of the spraying device, from where then a discharge of the washing liquor to the items to be cleaned takes place.

In terms of fluid technology, the collecting pot, into which the rinsing container discharges, is separated from the rinsing container provided by the rinsing container by a screening device. The rinsing liquor circulated in the intended use case by the circulating pump therefore accumulates in the collecting pot only after passing through the screening device inserted into the collecting pot. Leftovers, dirt particles and / or similar impurities are retained by the sieve device, so that it comes to circulation of a so far purified by screening rinsing liquor.

A screening device of the previously known type typically has a coarse screen, a fine screen and a flat screen. In this case, the surface sieve comes to lie in the final assembled state in a recess corresponding to the surface sieve in the bottom of the washing container.

The fine screen of the screening device is typically cylindrical. In normal operation, the fine sieve is flowed through from the inside to the outside, so that accumulated on the fine sieve impurities accumulate inside the cylinder-shaped fine sieve and form there a so-called filter cake. With increasing filter cake, the permeability of the fine sieve for rinsing liquor is reduced, which hampers the intended course of a rinsing program. In particular, the fine screen is therefore from time to time to clean manually by the user, which is expensive and the extent that the user perceived as disadvantageous. If such a cleaning on the part of the user does not occur, insufficient washing results may result.

Based on the above-described prior art, it is the object of the invention to constructively further develop a dishwasher of the type mentioned so that the user side a simplified handling of the screening device is made possible.

To solve this problem is with the invention, a dishwasher of initially mentioned type, which is characterized in that the circulation pump is an axial pump and that a second suction line is provided, by means of which the circulation pump is fluidly connected to the collecting pot.

The circulating pumps typically used in the prior art are radial pumps, as in the embodiment according to the aforementioned DE 10 2005 008 987 B3 , In contrast to this, it is proposed with the invention that an axial pump is used as a circulation pump.

The big advantage of an axial pump compared to a radial pump is that it is possible by reversing the impeller rotation to change the pump delivery direction. An axial pump can therefore be switched from left to right rotation and vice versa, which leads to a change in delivery direction. By means of an axial pump, it is therefore possible to selectively divert rinsing liquid from the collecting pot by means of a change of the impeller turning direction or to introduce it into the collecting pot.

According to the invention, a second suction line is further provided. By means of this second suction line formed as an axial circulation pump is fluidly connected to the collecting pot. In contrast to the prior art, a first suction line and a second suction line are therefore provided, wherein both suction lines form a fluidic connection of the circulating pump to the collecting pot.

As a result of this innovation according to the invention, it is possible to reverse the direction of the circulation pump, wherein depending on the adjusted direction of the circulating pump suction of wash liquor from the collecting pot takes place either via the first suction or via the second suction.

The possibility created by the construction according to the invention of being able to change the conveying direction of the circulation pump and thus to be able to guide the rinsing fluid flow either via the first or the second suction line offers the advantage of being able to backwash. Such backwashing effects that a filter cake formed on the inside of the fine sieve is broken up and detached from the fine sieve. The detached as a result of such backwashing filter cake can then on the same to the collecting pot connected sewer line are discharged. As a result, intermediate cleaning of the fine screen by backwashing is possible, which minimizes, if not eliminates, the need for manual cleaning of the fine screen by the user. Thus, the inventive design allows a total simplified user-side handling of the screening device.

A backwashing is also known from the prior art according to DE 10 2005 008 987 B3 possible. However, the construction described here is very complicated and comparatively complicated in the control technology handling. Because the construction after the DE 10 2005 008 987 B3 requires the use of a separate backwash pump. Accordingly, not only a sewage pump and a circulating pump are provided, but also a backwashing pump. Accordingly, it also requires complex lines to realize the fluidic connection of all pumps.

The embodiment of the invention is compared to the construction of the DE 10 2005 008 987 B3 built much easier, and in particular, because a separate backwash pump is not required. For in the embodiment according to the invention, both the rinsing operation and the backwashing operation are carried out via one and the same circulating pump. The construction according to the invention is therefore much more compact in contrast to the prior art. In addition, the conduction paths in the embodiment according to the invention are much shorter than in the prior art, which has a favorable effect on water consumption. Because for a proper flushing operation, it requires a minimum level within the collecting pot, so that a more cable path inevitably leads to increased water consumption.

As a result of the design according to the invention is overall that the fine filter of the screening device can be backwashed in a simple manner with the help of the already existing circulation pump. This simplifies the handling of the dishwasher by the user and in particular allows a minimization of a fine screen cleaning to be carried out manually by the user.

According to a further feature of the invention, it is provided that the second suction line has a suction section projecting into the collecting pot.

According to this embodiment, the suction line does not open into the collecting pot on the circumference, but instead a suction section in the form of a nozzle is provided, which protrudes into the collecting pot. Thus, there is a spacing between the suction-side suction port of the suction pipe and the bottom of the collecting pot. Accordingly, the suction section provides a suction opening that lies above the bottom of the collecting pot. The spacing provides the advantage that in the case of a backwash from the filter solubilizing particles can accumulate at the bottom of the collecting pot and not sucked through the second suction and circulated in the backwash.

It is therefore also provided according to a further feature of the invention that the suction section provides a suction opening, which is above the junction of a sewer connected to the sewer pipe. It is thus advantageously allowed to replace adhering particles by backwashing the filter, which then accumulate in the lower part of the collecting pot, from where then after completion of a backwash pumping can take place through the sewer pipe. The particles accumulating in the collection pot through a backwash can thus be discharged via the sewer pipe.

It is provided according to a further feature of the invention that the circulation pump is connected directly to the second suction line. According to this embodiment, both the first and second intake pipes are directly connected to the circulation pump. Depending on the direction of rotation of the circulating pump is thus a suction of wash liquor either via the first suction line or the second suction, wherein an introduction into the circulation pump takes place directly. The circulation pump has accordingly to have two connections for suction lines.

According to an alternative embodiment of the invention, it is provided that the circulation pump is connected to a supply line leading to a spray arm arranged in the washing container, wherein the second suction line opens into the supply line. Accordingly, the second suction line is not connected directly to the circulation pump, but indirectly with the interposition of a portion of a supply line connected to the circulation pump.

A circulation pump is typically connected to a suction line and to a Supply line connected. In the rinsing mode, rinsing fluid passes via the suction line to the circulating pump, from where the supply line is then acted upon. The supply line is in turn connected to at least one spray arm of the spray device of the dishwasher. In normal operation, therefore, the Spülflottenfluss from the collecting pot via the intake takes place in the circulation pump and from there via the supply line to the spray arm.

The inventively provided second intake pipe is now connected to the supply line. In the backwashing operation, therefore, suction of washing liquor from the collecting pot takes place via the second suction line, wherein the washing liquor conveyed via the second suction line flows into the supply line connected to the suction line and from there to the circulating pump. The delivery of the so-washed rinse liquor back into the collecting pot via the serving in the rinsing operation as a first suction line. Accordingly, in the backwashing operation, a recirculation circuit results via the second intake line, the supply line, the circulation pump and the first intake line, wherein the first intake line does not act as intake, but as discharge line in the backflushing operation.

In order to ensure that in normal operation no rinsing water introduced into the supply line flows via the second suction line into the collection pot, a blocking means, in particular a check valve, cooperating with the second suction line is provided. In normal flushing operation, this blocking means or check valve and thus also the second suction line is blocked. The rinsing liquor promoted in pump operation is thus conveyed solely via the supply line to the spray arm connected thereto. As soon as the circulating pump switches into the backwashing operation, the blocking means of the second suction line is opened, so that washing liquor can be conveyed from the collecting pot via the second suction line and the adjoining supply line in the reverse conveying direction.

In particular, a water diverter may be provided as a blocking means, in particular the already existing water diverter, which, moreover, serves to guide the rinsing liquor, starting from the circulating pump, alternately to the different spray arms. This water switch can be connected downstream of the circulation pump and / or integrated into the circulation pump or the circulation pump housing.

In contrast to a direct connection of the second supply line to the circulating pump, the connection of the second intake line to the supply line is preferred because the already existing line paths, in particular the already existing supply line, can be used. Both the construction costs and the length of the cable routes are minimized.

It is provided according to a further feature of the invention, that the second suction line is formed by a line section of a collecting duct projecting through the collecting pot and connected to a spray arm.

The spraying device of a dishwasher typically has three spray arms. There are provided an upper, a middle and a lower spray arm. The upper and middle spray arm are operated via separate or via a common supply line with rinsing liquor. The lower spray arm is connected to a separate supply line, which makes it possible to operate the lower spray arm independently of the other two spray arms. The supply line provided for the lower spray arm is guided, starting from the circulation pump or a water distributor connected thereto, through the collecting pot. This structural design is particularly useful when both the collecting pot and the lower spray arm are aligned centrically in relation to the Spülbehälterboden. A portion of this leading to the lower spray arm supply line can be used according to the invention as a second suction line. Thus, this line is used in the flushing operation as a supply line for the lower spray arm and backwash as suction for the circulation pump.

The supply line has a suction opening which automatically opens and / or closes depending on the spooling pressure; in particular, it is in a first direction through the supply line when the rinsing liquor is conveyed. in rinsing, closed and in the promotion of the washing liquor in the opposite direction, i. in backwash mode, opened.

The supply line is for this purpose preferably formed in two parts, wherein the two line parts are arranged telescopically to each other. In the overlap region of the pipe parts openings are formed in the pipe walls. These come in the contracted state of the two line parts in coverage. In the extended state of the two line parts such coverage is not given. This configuration has the effect that, in the rinsing operation, the rinsing pool pressure generated by the circulating pump ensures that the two line parts are moved apart, so that the supply line is tight due to lack of coverage of the wall openings, thus promoting the rinsing liquor to the spray arm connected to the supply line in the intended manner can take place. In the backflushing operation, there is no need for the two line parts to move apart from each other at the rinsing pool pressure, so that, following gravity, they move into one another following a stop. In this position, the two wall openings come into coverage, so that forms the necessary for a backwash suction.

The invention further proposes a method for operating a dishwasher of the type described above, is sucked in the rinsing mode rinse by means of the circulation pump via the first suction, in which for a backwash the direction of rotation of the circulating pump is reversed compared to the rinsing, so that rinsing is sucked by means of the circulation pump via the second suction line.

The method according to the invention makes it possible to differentiate between flushing operation on the one hand and backwashing operation on the other hand. In the backwash mode, rinse liquor is conveyed via the second suction line to the circulating pump and from there back into the collecting pot. As a result of the conveying direction reversal particles located on the inside of the fine filter, impurities and / or the like are replaced, which then accumulate in the lower part of the collecting pot, from where they can be pumped out and discarded by the sewage pump. The process implementation according to the invention thus makes possible an automated cleaning of the fine filter arranged in the collecting pot, so that a cleaning to be carried out manually on the user side is preferably no longer necessary, but at least less frequent in contrast to the prior art.

According to a further feature of the method according to the invention, it is provided that the second intake pipe is blocked in the rinsing operation. This ensures that rinsing water does not unintentionally flow past the spray arm, which is actually to be acted upon in the bypass, back into the collecting pot during rinsing operation.

Fig. 1

in rein schematischer Seitendarstellung eine Geschirrspülmaschine der erfindungsgemäßen Art im Spülbetrieb;

Fig. 2

in rein schematischer Seitendarstellung eine Geschirrspülmaschine der erfindungsgemäßen Art im Rückspülbetrieb;

Fig. 3

ausschnittsweise die erfindungsgemäße Geschirrspülmaschine in schematischer Perspektivdarstellung;

Fig. 4

die Ausschnittsdarstellung nach Fig. 3, wobei der Spülbetrieb der Geschirrspülmaschine gezeigt ist;

Fig. 5

die Ausschnittsdarstellung nach Fig. 3, wobei der Rückspülbetrieb der Geschirrspülmaschine gezeigt ist;

Fig. 6

in schematischer Seitenansicht der Rückspülbetrieb der erfindungsgemäßen Geschirrspülmaschine;

Fig. 7

in einer Ausschnittsdarstellung eine zweite Ausführungsform, wobei der Spülbetrieb der Geschirrspülmaschine gezeigt ist,

Fig. 8

die Darstellung nach Fig. 7, wobei der Rückspülbetrieb der Geschirrspülmaschine gezeigt ist;

Fig. 9

in einer Ausschnittsdarstellung eine dritte Ausführungsform, wobei der Spülbetrieb der Geschirrspülmaschine gezeigt ist,

Fig. 10

die Darstellung nach Fig. 9, wobei der Rückspülbetrieb der Geschirrspülmaschine gezeigt ist; und

Fig.11

in rein schematischer Seitendarstellung eine Geschirrspülmaschine nach dem Stand der Technik.

Further features and advantages of the invention will become apparent from the following Description based on the figures. Showing:

Fig. 1

in a purely schematic side view of a dishwasher of the type according to the invention in the rinsing operation;

Fig. 2

in a purely schematic side view of a dishwasher of the type according to the invention in the backwash operation;

Fig. 3

Sectionally the dishwasher according to the invention in a schematic perspective view;

Fig. 4

the cut-out representation after Fig. 3 showing the rinse operation of the dishwasher;

Fig. 5

the cut-out representation after Fig. 3 showing the backflushing operation of the dishwasher;

Fig. 6

in a schematic side view of the backwash operation of the dishwasher according to the invention;

Fig. 7

in a sectional view of a second embodiment, wherein the rinsing operation of the dishwasher is shown,

Fig. 8

the representation after Fig. 7 showing the backflushing operation of the dishwasher;

Fig. 9

in a sectional view of a third embodiment, wherein the rinsing operation of the dishwasher is shown,

Fig. 10

the representation after Fig. 9 showing the backflushing operation of the dishwasher; and

Figure 11

in a purely schematic side view of a dishwasher according to the prior art.

Fig. 11 can be seen in a purely schematic representation of a dishwasher 1 according to the prior art.

The dishwasher 1 has a housing 2 which accommodates a washing container 3. The washing container 3 in turn provides a washing compartment 4 for receiving items to be cleaned. For loading the washing compartment with items to be cleaned, the washing compartment 3 has a charging opening 16. This charging opening 16 can be closed in a fluid-tight manner by means of a flushing door 17, wherein the washing compartment door 17 is rotatably pivotable about a horizontally extending pivot axis.

When used as intended, the dishes to be cleaned are treated with rinsing liquor, for which purpose the dishwasher 1 has a spraying device 6. In the exemplary embodiment shown, the spray device 6 includes an upper spray arm 7 and a lower spray arm 8.

The spraying device 6 is fluidly connected by means of a supply line 11 to a circulation pump 9, by means of which the spray arms 7 and 8 of the spraying device 6 are supplied with rinsing liquor in the case of a rinsing operation.

The washing compartment 3, which provides the washing compartment 4, opens with respect to the plane of the drawing Fig. 11 on the underside in a collecting pot 5 a. At this collecting pot 5, the circulation pump 9 is connected by means of a suction line 10. Fluidtechnisch is between the collecting pot 5 and the washing compartment 4 a in Fig. 11 Screening device not shown arranged.

The rinsed in the intended use case of the circulation pump 9 rinse water passes from the collection 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 6 and 8 of the sprayer 6. From this, the rinsing liquor in the direction of the arrows Dispensed 18 to the items to be cleaned, from which it then drips and accumulates again after passing through the screen device in the collection pot 5.

Furthermore, a sewer pipe 13 together with drainage pump 12 is connected to the collecting pot 5. After completion of a purge operation carried out as intended, the rinsing liquor located in the collecting pot 5 and no longer required be pumped by the drain pump 12 in the direction of arrow 15 and transferred to a sewer system not shown in detail.

The dishwashing machine 1 designed according to the invention is in each case in a schematic side view in the FIGS. 1 and 2 shown. It shows Fig. 1 the so-called rinsing and Fig. 2 the so-called backwash operation.

The circulating pump 9 according to the prior art is a radial pump. In contrast, the embodiment according to the invention as a circulation pump 9 provides an axial pump. In addition, a second suction line 19 is provided, which connects the circulation pump 9 with the collecting pot 5 fluidically. By means of a check valve 20, the second suction line 19 can be blocked for the passage of rinsing water in case of need.

The in Fig. 1 Rinsing operation shown is carried out in the manner known from the prior art. By means of the circulation pump 9 located in the collecting pot rinsing liquor is sucked in via the first suction line 10 and then out in the direction of the arrow 14 via the supply line 11 to the spraying device 6. The check valve 20 is locked during the purging operation, so that sucked via the suction line 10 rinsing water can not unintentionally enter the second intake 19.

Fig. 2 shows the backwash operation. In contrast to a radial pump, the pump impeller rotation is reversible with an axial pump, with the effect that the pump's direction of pumping also reverses.

For the backwash operation, the pump impeller rotation direction of the circulation pump 9 is to be reversed. In addition, the check valve 20 is open. As a result, an aspiration of wash liquor takes place from the collection top 5 via the second suction line 19, in correspondence with the direction of the arrow 21. The wash liquor conveyed by the circulation pump 9 is conveyed back into the collecting pot 5 via the suction line 10 in the direction of the arrow 22 , In backflushing, therefore, no charging of the spraying device 6 with rinsing liquor takes place. In addition, in the backwash operation, the suction line 10 does not serve as a conduit for sucking rinsing water, but it is used as a line for returning the rinsing liquor sucked via the second suction 19 back into the collecting pot 5.

The possibility given by the construction according to the invention, according to the rinsing operation Fig. 1 in the backwash after Fig. 2 to be able to switch provides the advantage that a sieve arranged in the collecting pot 5 can be backwashed. Impurities, dirt particles and / or the like, which have settled on the screen as a result of a purge operation, can be solved in the backwash and then pumped out by means of the sewage pump 12 and disposed of with it. The possible according to the construction of the invention backwashing thus allows an automated cleaning of a sieve located in the collecting pot 5, whereby a user-side manual sieve cleaning is unnecessary.

The others FIGS. 3 to 10 let the embodiment of the invention partially detail in detail.

Fig. 3 shows the bottom 24 of the washing container 3. The bottom 24 is equipped with a recess 26, to which the collecting pot 5 connects. When used as intended, flushing liquor located in the washing compartment 4 can flow into the collecting pot 5 via the recess 26.

Between the washing compartment 4 and the collecting pot 5, a screening device is arranged. In the exemplary embodiment shown, this screening device has an area sieve 25 inserted into the recess 26 and a filter unit 27, which in turn has a coarse sieve 28 and a fine sieve 29.

To the collecting pot 5, the circulating pump 9 is fluidly connected with the interposition of a first suction line 10 in a conventional manner. On the output side, the supply line 11 is connected to the circulation pump 9, which leads in the embodiment shown here to the spray arm 7 of the spray 6.

According to the invention, a second suction line 19 is provided which opens into the supply line 11 in terms of flow. In this case, the second supply line 19 is equipped with a check valve 20, which allows to selectively lock the second supply line 19.

The second supply line 19 has an intake section 30, which protrudes into the collecting pot 5 in the manner of a pipe socket. Collecting pot side presents the suction section 30 an intake opening 31 ready, which lies in the height direction above the junction of the collecting pot 5 also connected to the sewer pipe 13.

Fig. 4 lets you recognize the normal rinse operation. Rinsing liquor discharged from the spray arm 7 enters the washing chamber 4, collects there and flows in correspondence with the arrows 30 in the collecting pot 5. The flushing liquor flowing into the collecting pot 5 in correspondence with the arrows 30 can either pass through the flat sieve 35 to the suction line 10 or through the coarse screen 28, followed by the fine screen 29 into the suction line 10. Via the suction line 10, the rinsing liquor passes under the action of the pumping power of the circulation pump 9 to the supply line 11, through which the rinsing liquor is guided in correspondence with the arrows 14 to the spray arm 7. The check valve 20 is locked in the purge mode, so that the pumped through the supply line 11 wash liquor can not get into the second intake 19.

Fig. 5 lets the backwash operation be detected. The pump impeller rotation direction of the circulation pump 9 designed as an axial pump is reversed. In addition, the check valve 20 is opened. As a result, located in the collecting pot wash liquor 20 is sucked in via the second suction line 19, passes the open check valve 20 and passes in correspondence of the arrow 21 to the circulation pump 9. From this, the wash liquor on the first suction line 10 in accordance with the arrow 22 back into the collecting pot. 5 promoted. As can be seen from the presentation Fig. 5 results in the arrows 22, the fine sieve 29 of the filter unit 27 is flowed through in the reverse direction in the rinsing operation in comparison to the rinsing, resulting in a detachment of located on the inside of the fine screen 29 impurities, dirt particles and / or the like. This factual relationship also arises in particular from the presentation Fig. 6 ,

As Fig. 6 can recognize, a filter cake 32 has attached on the inside of the fine sieve 29 due to a purge operation. This filter cake 32 contains impurities, soiling and / or similar particles 34. According to the prior art, this filter cake 32 forming in the rinsing operation is to be removed manually on the user side by cleaning the fine sieve 29. The embodiment of the invention allows automated cleaning.

In backwashing, namely, a flow through the fine screen 29 in a reverse direction compared to the flushing direction, in the direction of the arrows 22. As a result, the filter cake 32 forming particles dissolve 34 and fall in the collecting pot 5 down, where they are in the lower area accumulate the collecting pot 5, as in Fig. 6 can be seen. With completion of the backwash operation then the drain pump 12 is turn on, which then the accumulated in the lower region 33 of the collecting pot 5 particles 34 are pumped through the sewer line 13.

As can be seen from the presentation Fig. 6 results, the second intake 19 has a suction section 30 which projects into the collecting pot 5 in the manner of a nozzle, whereby the suction port 31 is located in the height direction above the junction of the sewer pipe 13 connected to the collecting pot. It is thus ensured that particles dissolving in the backwashing operation 34 can accumulate in the lower region 33 of the collecting pot and can not be sucked in via the second suction line 19 and then recirculated.

The FIGS. 7 and 8th let recognize another embodiment. It shows Fig. 7 the dishwashing operation of the dishwasher and Fig. 8 shows the backwashing of the dishwasher.

The embodiment according to the FIGS. 7 and 8th corresponds to the one after the FIGS. 4 and 5 , but with the difference that the second intake pipe 19 is not connected to the supply line 11, but directly to the circulation pump 9. The circulating pump 9 is equipped for this purpose with a corresponding water separator, which releases the fluidic connection between the second intake pipe 19 and circulating pump 9 in the backwash mode. In the flushing operation, the fluidic connection between the second suction line 19 and circulating pump 9 is blocked by the water switch.

The second embodiment according to the FIGS. 7 and 8th has compared to the first embodiment according to the FIGS. 4 and 5 the advantage that can be dispensed with a separate check valve 20 in the second intake 19. As blocking means in the circulation pump 9 already existing water separator is used.

A third and preferred embodiment is in Figures 9 and 10 shown. It shows Fig. 9 the dishwashing operation of the dishwasher and Fig. 10 shows the backwashing of the dishwasher.

The peculiarity of the embodiment according to the Figures 9 and 10 consists in that the second suction line 19 in the flushing operation the fluidic connection of a lower spray arm 41 to the supply line 11 is used. Like this Fig. 9 can be seen, in the flushing operation of the circulating pump 9 in accordance with the arrows 35 sucked rinsing carried not only on the supply line 11 to the upper spray arm 7, but also on the second suction line 19 to a lower spray arm 41.

The second intake pipe 19 has a first portion 36 and a second portion 37 which are telescopically arranged to each other. In this case, the second section 37 in the height direction 40 relative to the first section 36 to move translationally. In the embodiment shown, a coupling element 38 is provided for connecting the second portion 37 to the first portion 36, the through holes 39 provides.

In the rinse mode, as in Fig. 9 is shown, the pump pressure caused by the circulation pump 9 ensures that the second, ie the upper portion 37 of the suction line 19 moves in the height direction 40 relative to the lower portion 36 upwards. In this upwardly moved position of the second portion 37, the holes 39 are sealed fluid-tight. The rinsing fluid circulated by the circulating pump 9 can therefore be conveyed via the suction line 19 to the lower spray arm 41.

Fig. 10 lets the backwash operation be detected. In the case of the backwashing operation, no pressure is applied to the second suction line 19 by rinsing water conveyed by the circulation pump 9. As a result, the second section 37 lowers in the height direction 40 in relation to the first section 36 downwards. As a result, the holes 39 are released, so that located in the collecting pot rinsing can be sucked in the backwash by the circulation pump 9.

The opening or blocking of the bores 39 can be structurally achieved in a simple manner in that an inside of the holes 39 provided aperture element, the holes 39 are free or blocks, depending on whether the two Sections 36 and 37 of the second intake pipe 19 in the height direction 40 are moved up or down.

reference numeral

• 1 dishwasher
• 2 housings
• 3 rinse tanks
• 4 washroom
• 5 collection pot
• 6 spraying device
• 7 spray arm
• 8 spray arm
• 9 circulation pump
• 10 first suction line
• 11 supply line
• 12 drain pump
• 13 sewer pipe
• 14 arrow
• 15 arrow
• 16 feed opening
• 17 washroom door
• 18 arrow
• 19 second suction line
• 20 check valve
• 21 arrow
• 22 arrow
• 24 floor
• 25 area sieve
• 26 recess
• 27 filter unit
• 28 coarse strainer
• 29 fine sieve
• 30 intake section
• 31 intake opening
• 32 filter cake
• 33 area
• 34 particles
• 35 arrow
• 36 first section
• 37 second section
• 38 coupling element
• 39 bore
• 40 height direction
• 41 lower spray arm

Claims (9)

Dishwasher, in particular domestic dishwasher, with a washing compartment (4) providing a Spülbehälter (3), which serves to receive items to be cleaned, a collecting pot (5), in which the washing compartment (3) fluidly opens, and a circulating pump (9) is fluidically connected to the collecting pot (5) by means of a suction line (10),
characterized,
that the circulation pump (9) is an axial pump and in that a second suction line (19) is provided, by means of which the circulating pump (9) to the collecting pot (5) is fluidly connected. Dishwasher according to claim 1, characterized in that the second suction duct (19) has a suction section (30) projecting into the collecting pot (5). Dishwasher according to claim 2, characterized in that the suction section (30) provides a suction opening (31) which lies above the junction of a sewer (5) connected to the sewer pipe (13). Dishwasher according to one of the preceding claims, characterized in that the circulation pump (9) is connected directly to the second suction line (19). Dishwasher according to one of the preceding claims 1 to 3, characterized in that the circulating pump (9) is connected to a supply line (11) leading to a spray arm (7, 8) arranged in the washing container (3), the second connecting line (19) in the supply line (11) opens. Dishwasher according to one of the preceding claims, characterized by a check valve (20) cooperating with the second suction line (19). Dishwasher according to one of the preceding claims, characterized in that the second suction line (19) through a line section a feed line extending through the collecting pot (5) and connected to a spray arm (6, 7) is formed. Method for operating a dishwasher according to one of the preceding claims, wherein in the rinsing mode rinsing is sucked by means of the circulation pump (9) via the first suction line (10), in which for a backwash the direction of rotation of the circulation pump is reversed compared to the rinsing, so that Rinsing fluid is sucked by means of the circulation pump via the second suction line (19). A method according to claim 8, characterized in that the second intake pipe (19) is blocked in the purge mode.

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