Dishwasher, especially household dishwasher

Abstract

Dishwasher, in particular household dishwasher, with a washing container (3) providing a washing chamber (4) which serves to hold items to be cleaned, a collection pot (5) into which the washing container (3) flows, and a circulation pump (9) designed as an axial pump which is connected to the collection pot (5) by means of a suction line (10), characterized in that a second suction line (19) is provided by means of which the circulation pump (9) is connected to the collection pot (5) by means of a suction line.

Description

[0001] The invention relates to a dishwasher, in particular in the configuration of a household dishwasher, with a washing container providing a washing chamber for receiving items to be cleaned, a collection pot into which the washing container flows, and a circulation pump which is connected to the collection pot via a suction line.

[0002] Dishwashers of the type described above are well known from the prior art, which is why a separate printed reference is not required here. Therefore, reference is made only to DE 10 2005 008 987 B3 as an example.

[0003] Dishwashers of this type have a wash chamber that provides a washing area. This washing area is accessible to the user via a loading opening, which can be sealed fluid-tight by means of a pivoting wash chamber door. Under normal operating conditions, the wash chamber serves to hold items to be cleaned, which in the case of a household dishwasher may be dishes, cutlery, and / or the like.

[0004] To spray the items to be cleaned with cleaning fluid, also called rinse water, the dishwasher has a spray system integrated into the wash chamber. This spray system typically consists of rotating spray arms, usually two or three of which are provided. Under normal operating conditions, the items to be cleaned are sprayed with the rinse water by means of rotating spray arms.

[0005] A circulation pump is provided to supply the spray arms with rinsing solution; this pump is connected to the collection tank on one side and to the spray arms on the other.

[0006] Under normal operating conditions, the cleaning solution discharged by the spray system collects in the collection tank, into which the wash container flows. During recirculation mode, the circulation pump pumps the collected solution to the spray arms of the spray system, from where it is then discharged onto the items to be cleaned.

[0007] In terms of fluid technology, the collection tank into which the wash tank empties is separated from the wash chamber provided by the wash tank by a filter system. Under normal operating conditions, the wash water circulated by the pump only collects in the collection tank after passing through the filter system. Food residues, dirt particles, and / or similar contaminants are retained by the filter system, resulting in a circulating wash water that has been cleaned by filtration.

[0008] A screening device of the previously known type typically comprises a coarse screen, a fine screen, and a flat screen. In its fully assembled state, the flat screen rests in a recess in the bottom of the washing tank that corresponds to the size of the flat screen.

[0009] The fine screen of the screening unit is typically cylindrical. Under normal operating conditions, the water flows through the fine screen from the inside out, causing impurities retained by the screen to accumulate on the inside of the cylindrical screen and form a so-called filter cake. As the filter cake grows, the permeability of the fine screen to the cleaning solution decreases, hindering the proper functioning of a cleaning program. Therefore, the fine screen must be cleaned manually by the user from time to time, which is time-consuming and thus perceived as a disadvantage. If this cleaning is omitted, the cleaning result may be inadequate.

[0010] JP 2005334027 A discloses a dishwasher with a washing container, a collection pot into which the washing container flows and a circulation pump designed as an axial pump, which is connected to the collection pot by means of a suction line.

[0011] Based on the aforementioned prior art, the object of the invention is to further develop a dishwasher of the type mentioned at the outset in such a way as to enable simplified handling of the sieve device by the user.

[0012] To solve this problem, the invention proposes a dishwasher with the features of claim 1.

[0013] The circulation pumps typically used in the prior art are radial pumps, as is also the case in the embodiment according to DE 10 2005 008 987 B3 mentioned at the outset. In contrast, the invention proposes that an axial pump be used as the circulation pump.

[0014] The major advantage of an axial pump over a radial pump is that the pump's delivery direction can be changed by reversing the impeller's direction of rotation. An axial pump can therefore be switched from counterclockwise to clockwise rotation and vice versa, resulting in a change of delivery direction. Thus, by changing the impeller's direction of rotation, an axial pump can be used to either drain or introduce cleaning fluid into the collection tank.

[0015] According to the invention, a second suction line is further provided. The circulation pump, designed as an axial pump, is fluidically connected to the collection tank via this second suction line. Thus, in contrast to the prior art, a first suction line and a second suction line are provided, with both suction lines forming a fluidically direct connection between the circulation pump and the collection tank.

[0016] As a result of this innovation according to the invention, it is possible to reverse the direction of rotation of the circulation pump, whereby, depending on the set direction of rotation of the circulation pump, the suction of flushing fluid from the collection pot takes place either via the first suction line or via the second suction line.

[0017] The ability to change the flow direction of the circulation pump, thereby selectively directing the flushing liquor flow via either the first or the second suction line, is made possible by the inventive design and offers the advantage of backwashing. Such backwashing breaks up and detaches the filter cake formed inside the fine screen. The detached filter cake can then be discharged via the wastewater line, which is also connected to the collection tank. As a result, intermediate cleaning of the fine screen is possible through backwashing, minimizing, if not completely eliminating, the need for manual cleaning by the user. Thus, the inventive design as a whole simplifies the operation of the screening system by the user.

[0018] Backwashing is also possible according to the prior art as described in DE 10 2005 008 987 B3. However, the design described here is very complex and comparatively complicated in terms of control engineering. This is because the design according to DE 10 2005 008 987 B3 requires the use of a separate backwash pump. Therefore, not only a wastewater pump and a circulation pump are required, but also a backwash pump. Consequently, more complex piping systems are needed to implement the flow-related connection of all pumps.

[0019] The design according to the invention is much simpler in construction compared to the design according to DE 10 2005 008 987 B3, particularly because a separate backwash pump is not required. In the design according to the invention, both the flushing and backwashing operations are handled by one and the same circulation pump. The design according to the invention is therefore also much more compact than the prior art. In addition, the pipe runs in the design according to the invention are much shorter than in the prior art, which has a positive effect on water consumption. This is because a minimum fill level within the collection tank is required for proper flushing operation, so a longer pipe run inevitably leads to increased water consumption.

[0020] The result of the inventive design is that the fine filter of the sieve assembly can be easily backwashed using the existing circulation pump. This simplifies the user's operation of the dishwasher and, in particular, minimizes the need for manual cleaning of the fine filter by the user.

[0021] According to a further feature of the invention, the second suction line has a suction section projecting into the collection pot. In this embodiment, the suction line does not open circumferentially into the collection pot, but rather a suction section in the form of a nozzle is provided, which projects into the collection pot. This creates a gap between the suction-side intake opening of the suction line and the bottom of the collection pot. Thus, the suction section provides an intake opening located above the bottom of the collection pot. This gap offers the advantage that, in the event of backwashing, particles that detach from the filter can accumulate at the bottom of the collection pot and are not drawn in via the second suction line and circulated in the backwash circuit.

[0022] Therefore, according to a further feature of the invention, the intake section provides an intake opening located above the connection point of a wastewater pipe connected to the collection tank. This advantageously allows particles adhering to the filter to be dislodged by backwashing. These particles then accumulate in the lower part of the collection tank, from where they can be pumped out through the wastewater pipe after backwashing is complete. The particles that accumulate at the bottom of the collection tank during backwashing can thus be discharged via the wastewater pipe.

[0023] According to a further feature of the invention, the circulation pump is directly connected to the second suction line. In this embodiment, both the first and second suction lines are directly connected to the circulation pump. Depending on the direction of rotation of the circulation pump, cleaning fluid is thus drawn in either via the first suction line or the second suction line, and introduced directly into the circulation pump. The circulation pump must therefore have two connections for suction lines.

[0024] According to an alternative embodiment of the invention, the circulation pump is connected to a supply line leading to a spray arm located in the rinsing tank, with the second suction line opening into the supply line. Accordingly, the second suction line is not directly connected to the circulation pump, but indirectly via a section of a supply line connected to the circulation pump.

[0025] A circulation pump is typically connected to a suction line and a supply line. During the wash cycle, the wash water flows through the suction line to the circulation pump, from where it then supplies the supply line. The supply line is, in turn, connected to at least one spray arm of the dishwasher's spray system. Under normal operating conditions, the wash water flows from the sump through the suction line into the circulation pump and from there through the supply line to the spray arm.

[0026] The second suction line provided according to the invention is now connected to the supply line. During backwashing, flushing liquor is drawn from the collection tank via the second suction line. The flushing liquor conveyed via the second suction line flows into the supply line connected to the suction line and from there to the circulation pump. The discharge of the flushing liquor thus drawn back into the collection tank occurs via the line that serves as the first suction line during backwashing. Therefore, during backwashing, a circulation loop is created via the second suction line, the supply line, the circulation pump, and the first suction line, whereby the first suction line functions not as a suction line but as a discharge line during backwashing.

[0027] To ensure that no flushing solution introduced into the supply line flows into the collection tank via the second suction line during normal operation, a blocking device, specifically a shut-off valve, is provided in conjunction with the second suction line. During normal flushing operation, this blocking device or shut-off valve, and therefore the second suction line, is closed. The flushing solution pumped during operation is thus conveyed solely via the supply line to the connected spray arm. As soon as the circulation pump switches to backwash mode, the blocking device of the second suction line opens, allowing flushing solution to be drawn from the collection tank in the reverse direction via the second suction line and the subsequent supply line.

[0028] A water diverter can be used as a blocking device, in particular the existing water diverter, which also serves to alternately direct the rinsing solution from the circulation pump to the various spray arms. This water diverter can be located downstream of the circulation pump and / or integrated into the circulation pump or its housing.

[0029] Connecting the second suction line to the supply line is preferable to a direct connection of the second supply line to the circulation pump because existing pipework, especially the existing supply line, can be used. This minimizes both construction effort and pipe length.

[0030] According to a further feature of the invention, the second suction line is formed by a section of a supply line that extends through the collection pot and is connected to a spray arm.

[0031] The spray system of a dishwasher typically has three spray arms: an upper, a middle, and a lower spray arm. The upper and middle spray arms are supplied with wash water via separate or a shared supply line. The lower spray arm is connected to a separate supply line, allowing it to be operated independently of the other two. The supply line for the lower spray arm runs from the circulation pump or a water diverter connected to it through the sump. This design is particularly advantageous when both the sump and the lower spray arm are centered relative to the bottom of the wash tub. According to the invention, a section of this supply line leading to the lower spray arm can be used as a second suction line.This line thus serves as a supply line for the lower spray arm during flushing operation and as a suction line for the circulation pump during backwashing operation.

[0032] The supply line has a suction opening that opens and / or closes automatically depending on the flushing pressure; in particular, it is closed when the flushing liquor is conveyed in a first direction through the supply line, i.e., during flushing operation, and open when the flushing liquor is conveyed in the opposite direction, i.e., during backwashing operation.

[0033] The supply line is preferably designed in two parts, with the two sections being telescopically arranged relative to each other. Openings are formed in the pipe walls in the area where the pipe sections overlap. These openings overlap when the two pipe sections are retracted. When the two pipe sections are extended, this overlap is absent. This design ensures that, during flushing operation, the flushing fluid pressure generated by the circulation pump moves the two pipe sections apart, so that the supply line is sealed due to the lack of coverage of the wall openings. This allows the flushing fluid to be conveyed to the spray arm connected to the supply line as intended. During backwashing operation, this flushing fluid pressure, which moves the two pipe sections apart, is absent, so they move towards each other under the influence of gravity.In this position, the two wall openings overlap, creating the suction opening necessary for backwashing operation.

[0034] The invention further proposes a method for operating a dishwasher of the type described above, in which, during the washing operation, washing liquid is drawn in via the first suction line by means of the circulation pump, and in which, for a backwash operation, the direction of rotation of the circulation pump is reversed compared to the washing operation, so that washing liquid is drawn in via the second suction line by means of the circulation pump.

[0035] The process according to the invention allows a distinction between rinsing operation on the one hand and backwashing operation on the other. In backwashing operation, the rinsing solution is conveyed via the second suction line to the circulation pump and from there back into the collection tank. As a result of the reversal of the flow direction, particles, impurities, and / or the like located on the inside of the fine filter are dislodged and then accumulate in the lower part of the collection tank, from where they can be pumped out and discarded by means of the wastewater pump. The process according to the invention thus enables automated cleaning of the fine filter arranged in the collection tank, so that manual cleaning by the user is preferably no longer necessary, or at least less frequently required compared to the prior art.

[0036] According to a further feature of the method according to the invention, the second suction line is blocked during rinsing operation. This ensures that, during rinsing operation, rinsing fluid does not unintentionally flow back into the collection pot via a bypass around the spray arm that is actually intended to be sprayed.

[0037] Further features and advantages of the invention will become apparent from the following description with reference to the figures. These show: Fig. 1 in a purely schematic side view of a dishwasher of the type according to the invention in washing operation; Fig. 2 in purely schematic side view a dishwasher of the type according to the invention in backwash operation; Fig. 3. Partial view of the dishwasher according to the invention in schematic perspective representation; Fig. 4 the section view according to Fig. 3, showing the washing operation of the dishwasher; Fig. 5 the section view according to Fig. 3, showing the backwash operation of the dishwasher; Fig. 6 in schematic side view of the backwash operation of the dishwasher according to the invention; Fig. 7 in a partial view a second embodiment, showing the washing operation of the dishwasher, Fig. 8 the representation according Fig. 7, showing the backwash operation of the dishwasher; Fig. 9 in a partial view a third embodiment, showing the washing operation of the dishwasher, Fig. 10 the representation according Fig. 9, showing the backwash operation of the dishwasher; and Fig. 11 in a purely schematic side view of a state-of-the-art dishwasher.

[0038] Fig. Figure 11 shows a state-of-the-art dishwasher 1 in a purely schematic representation.

[0039] The dishwasher 1 has a housing 2 that accommodates a wash tub 3. The wash tub 3, in turn, provides a wash chamber 4 for receiving items to be cleaned. For loading the wash chamber with items to be cleaned, the wash tub 3 has a loading opening 16. This loading opening 16 can be closed in a fluid-tight manner by means of a wash chamber door 17, the wash chamber door 17 being mounted to pivot about a horizontally extending pivot axis.

[0040] In its intended use, the dishwasher 1 provides a spray device 6 to spray the items to be cleaned. In the illustrated embodiment, the spray device 6 comprises an upper spray arm 7 and a lower spray arm 8.

[0041] The spray device 6 is connected to a circulation pump 9 via a supply line 11, by means of which the spray arms 7 and 8 of the spray device 6 are supplied with rinsing liquor in the event of a rinsing operation.

[0042] The washing container 3, which provides the washing chamber 4, opens with reference to the drawing plane to Fig. 11 into a collection pot 5 from below. The circulation pump 9 is connected to this collection pot 5 by means of a suction line 10. In terms of fluid technology, there is a gap between the collection pot 5 and the washing chamber 4. Fig. 11 sieve devices not shown in detail are arranged.

[0043] In normal use, the cleaning solution circulated by the circulation pump 9 flows from the collection tank 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 spray device 6. From here, the cleaning solution is discharged in the direction of arrows 18 onto the items to be cleaned, from which it then drips off and, after passing through the sieve device, collects again in the collection tank 5.

[0044] Furthermore, a wastewater pipe 13, including a drain pump 12, is connected to the collection tank 5. After completion of a properly performed rinsing operation, the rinsing solution remaining in the collection tank 5 and no longer required can be pumped out by the drain pump 12 in the direction of arrow 15 and transferred to a wastewater system (not shown).

[0045] The dishwasher 1 designed according to the invention is shown in a schematic side view in the Fig. 1 and Fig. 2 is shown. This shows Fig. 1 the so-called flushing operation and Fig. 2 the so-called backwash operation.

[0046] The circulation pump 9 according to the prior art is a radial pump. In contrast, the embodiment according to the invention provides for an axial pump as the circulation pump 9. In addition, a second suction line 19 is provided, which connects the circulation pump 9 to the collection tank 5 in terms of flow. By means of a shut-off valve 20, the second suction line 19 can be closed to allow the passage of flushing fluid if necessary.

[0047] The in Fig. The flushing operation shown in Figure 1 is carried out in a manner known from the prior art. Flushing solution located in the collection tank is drawn in by the circulation pump 9 via the first suction line 10 and then conveyed in the direction of arrow 14 via the supply line 11 to the spray device 6. The shut-off valve 20 is closed during the flushing operation, so that flushing solution drawn in via the suction line 10 cannot unintentionally enter the second suction line 19.

[0048] Fig. Figure 2 shows the backwash operation. Unlike a radial pump, the impeller rotation direction of an axial pump is reversible, with the effect that the pump's delivery direction is also reversed.

[0049] For backwashing, the impeller rotation of the circulation pump 9 must be reversed. Additionally, the shut-off valve 20 must be opened. Consequently, cleaning solution is drawn from the collection tank 5 via the second suction line 19, in the direction indicated by arrow 21. The cleaning solution thus pumped by the circulation pump 9 is returned to the collection tank 5 via the suction line 10 in the direction indicated by arrow 22. During backwashing, the spray device 6 is therefore not supplied with cleaning solution. Furthermore, during backwashing, the suction line 10 is not used for drawing in cleaning solution, but rather for returning the cleaning solution drawn in via the second suction line 19 back to the collection tank 5.

[0050] The possibility, given by the inventive design, of switching from the rinsing operation to Fig. 1 into backwash mode after Fig. Being able to switch between positions 2 offers the advantage that a sieve located in the collection pot 5 can be backwashed. Contaminants, dirt particles, and / or the like that have accumulated on the sieve as a result of normal rinsing can be loosened during backwashing and then pumped out by the wastewater pump 12 for disposal. The backwashing made possible by the design according to the invention thus allows for automated cleaning of a sieve located in the collection pot 5, thereby eliminating the need for manual sieve cleaning by the user.

[0051] The further Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. Figure 10 shows the embodiment according to the invention in detail in excerpts.

[0052] Fig. Figure 3 shows the base 24 of the wash tank 3. The base 24 is equipped with a recess 26 to which the collection pot 5 is connected. In normal use, wash water in the wash chamber 4 can flow into the collection pot 5 via the recess 26.

[0053] A sieve assembly is arranged between the washing chamber 4 and the collection pot 5. In the illustrated embodiment, this sieve assembly has a surface 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.

[0054] The circulation pump 9 is connected to the collection tank 5 in a manner known per se, via a first suction line 10. The supply line 11 is connected to the output side of the circulation pump 9 and, in the embodiment shown here, leads to the spray arm 7 of the spray device 6.

[0055] According to the invention, a second suction line 19 is provided, which flows into the supply line 11. The second supply line 19 is equipped with a shut-off valve 20, which makes it possible to selectively shut off the second supply line 19.

[0056] The second supply line 19 has a suction section 30, designed like a pipe stub, which projects into the collection tank 5. On the collection tank side, the suction section 30 provides a suction opening 31, which is located vertically above the connection point of the wastewater line 13, which is also connected to the collection tank 5.

[0057] Fig. Figure 4 indicates normal washing operation. The washing solution discharged from the spray arm 7 enters the washing chamber 4, collects there, and flows into the collection pot 5 in accordance with arrows 30. The washing solution flowing into the collection pot 5 in accordance with arrows 30 can either pass through the flat screen 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 washing solution, driven by the pumping action of the circulation pump 9, reaches the supply line 11, through which the washing solution is directed to the spray arm 7 in accordance with arrows 14. The shut-off valve 20 is closed during washing operation, so that the washing solution pumped through the supply line 11 cannot enter the second suction line 19.

[0058] Fig. Figure 5 indicates the backwashing operation. The impeller rotation of the axial-driven circulation pump 9 is reversed. Additionally, the shut-off valve 20 is opened. Consequently, the flushing solution 20 in the collection tank is drawn in via the second suction line 19, passes through the open shut-off valve 20, and flows to the circulation pump 9 in the direction indicated by arrow 21. From there, the flushing solution is pumped back into the collection tank 5 via the first suction line 10 in the direction indicated by arrow 22. As can be seen from the illustration... Fig. As shown in Figure 5 with reference to arrows 22, the fine screen 29 of the filter unit 27 is subjected to reverse flow during rinsing compared to the rinsing direction, which leads to the removal of impurities, dirt particles, and / or the like located inside the fine screen 29. This connection is also particularly evident from the illustration in Figure 5. Fig. 6.

[0059] How Fig. As can be seen in Figure 6, a filter cake 32 has accumulated on the inside of the fine screen 29 as a result of normal rinsing operation. This filter cake 32 contains impurities, dirt, and / or similar particles 34. According to the prior art, this filter cake 32, which forms during rinsing operation, must be removed manually by the user by cleaning the fine screen 29. The design according to the invention allows for automated cleaning.

[0060] During backwashing, the flow through the fine screen 29 occurs in the opposite direction to backwashing, namely in the direction of arrows 22. As a result, the particles 34 forming the filter cake 32 are dislodged and fall to the bottom of the collection pot 5, where they accumulate in the lower part of the collection pot 5, as shown in Fig. 6 can be seen. Once the backwashing operation is complete, the drain pump 12 is switched on, which then pumps out the particles 34 that have accumulated in the lower area 33 of the collection tank 5 via the wastewater line 13.

[0061] As can be seen from the presentation according to Fig. As 6 results, the second suction line 19 has a suction section 30 that projects into the collection tank 5 in the manner of a nozzle, so that the suction opening 31 is located vertically above the connection point of the wastewater line 13 connected to the collection tank 5. This ensures that particles 34 released during backwashing can accumulate in the lower area 33 of the collection tank and are not drawn in via the second suction line 19 and then recirculated.

[0062] The Fig. 7 and Fig. Figure 8 shows a further embodiment. This shows Fig. 7 the washing operation of the dishwasher and Fig. Figure 8 shows the backwash operation of the dishwasher.

[0063] The embodiment according to the Fig. 7 and Fig. 8 corresponds to the one according to the Fig. 4 and Fig. 5, but with the difference that the second suction line 19 is not connected to the supply line 11, but directly to the circulation pump 9. For this purpose, the circulation pump 9 is equipped with a corresponding water diverter, which, during backwashing, opens the flow connection between the second suction line 19 and the circulation pump 9. During flushing, however, the water diverter blocks the flow connection between the second suction line 19 and the circulation pump 9.

[0064] The second embodiment according to the Fig. 7 and Fig. 8 has, compared to the first embodiment, according to the Fig. 4 and Fig. 5. This has the advantage that a separate shut-off valve 20 in the second suction line 19 can be dispensed with. The water diverter already present in the circulation pump 9 is used as the shut-off device.

[0065] A third and preferred embodiment is described in the Fig. 9 and Fig. 10 is shown. This shows Fig. 9 the washing operation of the dishwasher and Fig. Figure 10 shows the backwash operation of the dishwasher.

[0066] The special feature according to the embodiment according to the Fig. 9 and Fig. 10 consists in the fact that the second suction line 19 serves, during flushing operation, for the flow-related connection of a lower spray arm 41 to the supply line 11. How this Fig. As can be seen from 9, during flushing operation the flushing fluid drawn in by the circulation pump 9 in accordance with arrows 35 is conveyed not only via the supply line 11 to the upper spray arm 7, but also via the second suction line 19 to a lower spray arm 41.

[0067] The second intake pipe 19 has a first section 36 and a second section 37, which are arranged telescopically relative to each other. The second section 37 can move translationally in the vertical direction 40 relative to the first section 36. In the illustrated embodiment, a coupling element 38 is provided for connecting the second section 37 to the first section 36; this coupling element provides through-holes 39.

[0068] In the dishwashing operation, as it is in Fig. As shown in Figure 9, the pump pressure generated by the circulation pump 9 causes the second, i.e., the upper, section 37 of the suction line 19 to move upwards in the vertical direction 40 relative to the lower section 36. In this upward position of the second section 37, the bores 39 are fluid-tight. The flushing solution circulated by the circulation pump 9 can therefore be conveyed via the suction line 19 to the lower spray arm 41.

[0069] Fig. Figure 10 indicates the backwashing operation. During backwashing, the second suction line 19 is not pressurized by the flushing fluid pumped by the circulation pump 9. As a result, the second section 37 lowers in the vertical direction 40 relative to the first section 36. Consequently, the bores 39 are opened, allowing the flushing fluid in the collection tank to be drawn in by the circulation pump 9 during backwashing.

[0070] The opening or blocking of the bores 39 can be achieved in a simple way by means of a baffle element provided inside the bores 39, which opens or blocks the bores 39 depending on whether the two sections 36 and 37 of the second intake line 19 have moved upwards or downwards in the vertical direction 40. Reference sign 1 dishwasher 2 cases 3 washing containers 4. Dishwashing area 5 collection pot 6 Spray device 7 spray arm 8 spray arm 9 Circulation pump 10 first intake pipe 11 Supply line 12 Drain pump 13 Wastewater pipe 14 Arrow 15 Arrow 16 Loading opening 17 Dishwashing area door 18 Arrow 19 second intake pipe 20 shut-off valve 21 Arrow 22 Arrow 24 floor 25 surface sieve 26 Exclusion 27 filter units 28 Coarse sieve 29 fine sieve 30 Intake section 31 Intake opening 32 filter cakes 33 Area 34 particles 35 Arrow 36 first section 37 second section 38 coupling element 39 bore 40 Altitude direction 41 lower spray arm

Claims

Dishwasher, in particular household dishwasher, with a washing container (3) providing a washing chamber (4) which serves to hold items to be cleaned, a collection pot (5) into which the washing container (3) flows, and a circulation pump (9) designed as an axial pump which is connected to the collection pot (5) by means of a suction line (10), characterized in that a second suction line (19) is provided by means of which the circulation pump (9) is connected to the collection pot (5) by means of a suction line. Dishwasher according to claim 1, characterized in that the second suction line (19) has a suction section (30) projecting into the collection pot (5). Dishwasher according to claim 2, characterized in that the suction section (30) provides a suction opening (31) which is located above the connection point of a wastewater line (13) connected to the collection pot (5). Dishwasher according to one of the preceding claims, characterized in that the circulation pump (9) is directly connected to the second suction line (19). Dishwasher according to one of the preceding claims 1 to 3, characterized in that the circulation pump (9) is connected to a supply line (11) leading to a spray arm (7, 8) arranged in the wash tub (3), wherein the second suction line (19) opens into the supply line (11). Dishwasher according to one of the preceding claims, characterized by a shut-off 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) is formed by a section of a supply line extending through the collection pot (5) and connected to a spray arm (6, 7). Method for operating a dishwasher according to one of the preceding claims, wherein in the washing operation washing liquor is drawn in by means of the circulation pump (9) via the first suction line (10), wherein for a backwash operation the direction of rotation of the circulation pump is reversed compared to the washing operation, so that washing liquor is drawn in by means of the circulation pump via the second suction line (19). Method according to claim 8, characterized in that the second suction line (19) is blocked during flushing operation.

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