Domestic dishwasher

Abstract

The invention relates to a domestic dishwasher (1) comprising: a washing container (2) for holding washware (39); a pump sump (16) provided on the washing container (2); a screen system (17); a lye pump (23); and a circulation pump (26), wherein the screen system (17) has a surface screen (18) that covers at least part of the pump sump (16), wherein the screen system (17) has a divider screen (19) that divides the pump sump (16) into an unclean region (20) and a clean region (21), wherein the lye pump (23) is connected to the unclean region (20) and the circulation pump (26) is connected to the clean region (21), wherein the divider screen (19) has a fluid-permeable divider screen filter section (49), wherein the divider screen filter section (49) has a first perforated region (65) with a first perforation (66) and a second perforated region (68), that is separated from the first perforated region (65), with a second perforation (69) different from the first perforation (66), and wherein, starting from the first perforated region (65), the second perforated region (68) is positioned facing the surface screen (18).

Description

[0001] household dishwasher

[0002] The present invention relates to a household dishwasher.

[0003] A dishwasher has a wash tub in which wash ware can be accommodated. Spray devices, for example in the form of rotatable spray arms, can be provided in the wash tub to apply wash liquor and / or fresh water to the wash ware. These spray devices are part of a hydraulic circuit of the dishwasher. A pump sump is arranged on the underside of the wash tub, to which a sieve system is assigned. The sieve system comprises a flat sieve that covers at least part of the pump sump, and a usually cylindrical fine or micro sieve that is arranged within the pump sump. A circulating pump is connected to the pump sump, which, with the aid of the sieve system, feeds filtered wash liquor and / or fresh water to the spray devices via the hydraulic circuit.Furthermore, a drain pump is connected to the pump sump, which is designed to pump contaminated rinsing liquid and / or fresh water out of the hydraulic circuit.

[0004] Due to the dirt load on the sieve system during a dishwasher cycle, it may be necessary to manually clean the fine or micro sieve, which is clogged with dirt, cyclically to maintain a good filtering effect and thus ensure good washing performance. However, according to internal experience, a sieve cleaning nozzle can be provided on one of the spray devices to clean the flat sieve. However, the fine or micro sieve is located below the flat sieve in the pump sump and therefore cannot be cleaned automatically or only with considerable design effort.

[0005] Against this background, it is an object of the present invention to provide an improved household dishwasher.

[0006] Accordingly, a household dishwasher is proposed with a washing container for receiving wash ware, a pump sump provided on the washing container, a sieve system, a drain pump and a circulation pump.The screening system comprises a surface screen which covers the pump sump at least in sections, wherein the screening system comprises a separating screen which separates the pump sump into a raw area and a clean area, wherein the drain pump is connected to the raw area and the circulation pump is connected to the clean area, wherein the screening system comprises a fluid-permeable separating screen filter section, wherein the separating screen filter section has a first perforation area with a first perforation and a second perforation area separate from the first perforation area and with a second perforation different from the first perforation, and wherein, starting from the first perforation area, the second perforation area is arranged facing the surface screen. The second perforation area is therefore located between the first perforation area and the surface screen.

[0007] The separating screen or separating screen filter section separates the raw zone and the clean zone, allowing dirt particles of a specific size to remain in the raw zone. At the same time, an exchange of rinse liquor and / or fresh water can take place between the raw zone and the clean zone, and vice versa. A coarse filter volume flow of rinse liquor and / or fresh water flowing into the raw zone can only flow through the separating screen filter section with a defined filter stage into the clean zone. This exchange of rinse liquor and / or fresh water is maintained even when the separating screen filter section is partially closed, for example, if it is clogged with dirt particles.

[0008] Because the separating sieve filter section has two separate perforation areas with different perforations, the filtering effectiveness of the separating sieve can be varied across the surface of a largest side of the separating sieve filter section. For example, the first perforation of the first perforation area can be impermeable to both small and medium-sized dirt particles. The aforementioned dirt particles are therefore filtered out of the rinse solution and / or the fresh water in the area of ​​the first perforation area. In contrast, the second perforation area can also be impermeable to medium-sized dirt particles, but permeable to smaller dirt particles. Medium-sized dirt particles are therefore also filtered out by the second perforation area, whereas smaller dirt particles can pass through the perforation of the second perforation area.This prevents the second perforation area from becoming clogged with smaller dirt particles. During normal operation, the exchange of rinse water and / or fresh water takes place via the first perforation area. In the event of high dirt loads or if the first perforation area becomes gradually clogged with dirt particles, the exchange of rinse water and / or fresh water takes place via the second perforation area and the washing operation can be maintained without a noticeable deterioration in washing performance. If the second perforation area were not there, the raw area could fill up and dirt particles of all sizes would be fed back into the washing container. In contrast, the second perforation area results in significantly better washing performance because it forms a type of overflow through which the rinse water and / or fresh water is directed into the raw area even when the first perforation area is clogged.

[0009] The washing compartment is preferably cuboid-shaped. The washing compartment can be closed by means of a door pivotably attached to the washing compartment. Several washware receptacles, for example, a lower basket, an upper basket, and a cutlery drawer, can be provided within the washing compartment. The washware can be accommodated in the receptacles, which are then subjected to wash liquor and / or fresh water via a hydraulic circuit of the household dishwasher. The drain pump and the circulation pump are preferably part of the hydraulic circuit. "Surface" in this case can include spraying or wetting the washware. "Wash liquor" in this case refers to water containing an additive, such as detergent and / or rinse aid, and / or dirt particles detached from the washware.

[0010] The fact that the pump sump is "provided" on the washing tank is understood in particular to mean that the pump sump is attached or mounted to the washing tank. In particular, the pump sump can be attached to a bottom of the washing tank. The pump sump can be part of the bottom. The pump sump can also be referred to as a pump pot. The screening system is preferably multi-part and comprises the flat screen and the separating screen. The flat screen and the separating screen are preferably at least partially removable from the washing tank. The fact that the separating screen "separates" the pump sump into the raw area and the clean area means in particular that the separating screen is arranged at least partially between the raw area and the clean area. The bottom areas of the raw and / or clean areas are preferably formed, at least in part, by the bottom of the pump sump.

[0011] Both the flat screen and the separating screen are fluid-permeable, at least in sections. "Fluid-permeable" in this context means that rinsing solution and / or water can flow through the flat screen and / or the separating screen. The fluid-permeable sections of the flat screen and the separating screen each have a perforation with a plurality of openings. The first perforation in the first perforation area of ​​the separating screen is smaller or finer than the perforation of the flat screen. This means that the openings in the first perforation of the separating screen preferably each have a smaller cross-sectional area than the openings in the flat screen.

[0012] “With different perforations” is to be understood here to mean that the first perforation is formed by a plurality of first openings and the second perforation by a plurality of second openings, wherein the diameters and / or the cross-sectional areas of the first openings and the second openings differ, in particular the first openings of the first perforation have a larger diameter and / or a larger cross-section than the second openings of the second perforation. The openings can be circular or rectangular, in particular square, triangular, honeycomb-shaped or elliptical. In the event that the openings in a perforation area are not uniformly designed, the preceding statement refers in each case to the average diameters and / or cross-sectional areas.

[0013] The drain pump and the circulation pump are both arranged adjacent to the pump sump and preferably mounted on the pump sump. The drain pump and the circulation pump are preferably arranged and preferably mounted on the pump sump such that the pump sump is located between the drain pump and the circulation pump. The raw area of ​​the pump sump can also be referred to as the dirty area. The clean area can also be referred to as the circulation area. The separation screen, in particular a fluid-permeable separation screen filter section of the separation screen, is arranged between the raw area and the clean area. To filter the rinse liquor and / or the fresh water, these flow partially from the raw area into the clean area through the separation screen, in particular through the separation screen filter section. Dirt particles are separated on the separation screen, in particular on the separation screen filter section, on the raw area side.

[0014] The flat screen can have any desired geometry. Preferably, the flat screen is ring-shaped or has the shape of a ring segment. However, the flat screen can also be rectangular or elliptical. The screen system is preferably removable. In particular, the separating screen can also be removed from the flat screen. This makes it possible, for example, to remove the separating screen from the household dishwasher without dismantling the flat screen. The separating screen can be positively connected to the flat screen. A positive connection is created by two components interlocking or engaging behind one another. For example, the separating screen is locked to the flat screen. The flat screen can be or comprise, for example, a perforated metal sheet or a metal mesh overmolded with plastic, or a plastic component. Any combination of these designs is also conceivable.It can be particularly advantageous if the surface screen has sections with different perforations or filtering effects. The same applies to the separating screen. The separating screen, in particular the separating screen filter section, can particularly preferably be a grid-shaped or mesh-shaped plastic component.

[0015] According to one embodiment, the openings of the second perforation are at least twice, preferably three times, particularly preferably four times as large as the openings of the first perforation.

[0016] In this case, this means that the openings of the second perforation have a diameter that is at least twice, preferably three times, and particularly preferably four times the diameter of the openings of the first perforation. If the openings are circular, the cross-sectional areas of the second openings of the second perforation are at least four times, preferably nine times, and particularly preferably sixteen times the cross-sectional areas of the first openings of the first perforation.

[0017] According to one embodiment, a total area of ​​all openings in the first perforation region is comparable in size to a total area of ​​all openings in the second perforation region. Comparably large in this case means that the sizes of the aforementioned total areas differ from one another by no more than 30%, preferably by no more than 20%, more preferably by no more than 10%, or particularly preferably by no more than 5%. This ensures that a volume flow of rinsing liquor and / or fresh water, which flows through the first perforation region during normal operation, can also flow through the second perforation region if the first perforation region is clogged with dirt particles, without the pump chamber overflowing.

[0018] This comparable size of the total areas of the two perforation areas can be achieved, for example, by a height of the second perforation area being a maximum of 66%, preferably a maximum of 50%, more preferably a maximum of 33% or particularly preferably a maximum of 20% of the height of the first perforation area.

[0019] According to a further embodiment, the separating sieve filter section has a third region which is arranged between the first perforation region and the second perforation region with respect to a vertical direction, wherein the third region is free of perforations or has a perforation which is formed by openings which are larger in diameter and / or cross-sectional area than the openings of the first perforation region and smaller than the openings of the second perforation region.

[0020] Any number of perforation areas can be provided. The perforation areas can be directly adjacent to one another. Optionally, however, a third area which is free of perforations can be provided between the first perforation area and the second perforation area. The perforation-free third area can achieve an increased flow velocity in the area of ​​the first perforation area and / or the second perforation area. This can promote the detachment of dirt particles, particularly during operation of the drain pump. In this case, the vertical direction is understood to be the spatial direction oriented perpendicular to the ground and pointing distally away from the earth's center.

[0021] However, the third region can also have a perforation. This perforation can have openings whose cross-sectional areas and / or diameters increase from the first perforation region toward the second perforation region. This also allows for a dynamic, seamless transition from normal operation, in which flow passes through the first perforation region, to operation in which flow passes through the second perforation region.

[0022] According to a further embodiment, the separating screen filter section is flat.

[0023] This means, in particular, that the separating screen filter section is plate-shaped or planar. However, to increase the surface area of ​​the separating screen filter section, the separating screen filter section can also be designed alternatively, such as wave-shaped or pleated, at least in a partial area. Other configurations are also conceivable depending on the installation space and design.

[0024] According to a further embodiment, the separating sieve filter section is oriented, at least in a partial area, at an angle of 45° to 90°, in particular perpendicular to the surface sieve.

[0025] In the present case, "perpendicular" means an angle of 90° ± 10°, preferably 90° ± 5°, more preferably 90° ± 3°, more preferably 90° ± 1°, more preferably exactly 90°.

[0026] According to a further embodiment, the separating screen has a non-return valve which can only be opened for a volume flow from the clean area into the raw area.

[0027] In this context, a check valve is an opening or aperture that allows the flow of rinse water and / or fresh water only in one direction. Flow in a direction opposite to the flow direction is not possible.

[0028] In this case, the check valve is preferably part of the separating screen. It is arranged and aligned such that the flow direction points from the clean area to the untreated area. Consequently, rinsing solution and / or fresh water can only flow through the check valve from the clean area to the untreated area. When the circulation pump is operating, rinsing solution and / or fresh water flows from the untreated area to the clean area, causing the check valve to close and / or remain closed. Consequently, flow through the check valve is not possible during this operating state. This eliminates any influence of the check valve on the filter effectiveness of the separating screen filter section.

[0029] When the drain pump is operating, however, the non-return valve opens or remains open. Wash liquor and / or fresh water can then flow from the clean area through the non-return valve into the dirty area and be pumped away by the drain pump. This can be particularly advantageous if the separating screen filter section is clogged with dirt particles, particularly on the side of the separating screen filter section facing the clean area. This allows the wash liquor and / or fresh water to be pumped out even if the separating screen filter section is clogged with dirt particles, as described above. This can increase the robustness of the household dishwasher.

[0030] According to a further embodiment, the non-return valve is arranged at an end section of the separating screen facing away from the surface screen.

[0031] By arranging the check valve at an end section of the separating screen facing away from the flat screen, the check valve is positioned particularly close to a pump sump outlet belonging to the drain pump. As a result, when the drain pump is in operation, the smallest possible area of ​​the separating screen and / or the separating screen filter section is affected by the flow through the check valve. The area of ​​the separating screen filter section arranged from the check valve in the direction of the flat screen is therefore also flowed through from the clean area to the dirty area when the check valve is open. This ensures that dirt particles are detached from the separating screen filter section even when the check valve is open, thus cleaning the separating screen. Manual cleaning of the separating screen is either unnecessary or the time intervals for manual cleaning are at least significantly extended.

[0032] An embodiment of the invention is also conceivable in which one of the perforated areas is formed by the non-return valve described above. Furthermore, even a household dishwasher with a washing container for holding wash ware, a pump sump provided on the washing container, a sieve system, a drain pump, and a circulating pump would be conceivable, in which the sieve system has a surface sieve that covers the pump sump at least in sections, wherein the sieve system further has a separating sieve that separates the pump sump into a raw area and a clean area, wherein the drain pump is connected to the raw area and the circulating pump is connected to the clean area, and wherein the sieve system has a fluid-permeable separating sieve filter section that is formed by a non-return valve described above.

[0033] An exchange of rinsing solution and / or fresh water would then only be possible from the clean area to the raw area and exclusively through the check valve.

[0034] Further possible implementations of the household dishwasher also include combinations of features or embodiments described above or below with regard to the exemplary embodiments that are not explicitly mentioned. In this case, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the household dishwasher.

[0035] Further advantageous configurations and aspects of the household dishwasher are the subject of the dependent claims and the exemplary embodiments of the household dishwasher described below. The household dishwasher is explained in more detail below using preferred embodiments with reference to the accompanying figures.

[0036] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher;

[0037] Fig. 2 shows a schematic sectional view of the household dishwasher according to Fig. 1;

[0038] Fig. 3 shows a schematic plan view of an embodiment of a filter system for the household dishwasher according to Fig. 1; Fig. 4 shows view IV according to Fig. 3;

[0039] Fig. 5 shows a schematic side view of the screening system according to Fig. 3;

[0040] Fig. 6 shows a further schematic plan view of the screening system according to Fig. 3;

[0041] Fig. 7 shows a schematic plan view of an embodiment of a separating screen for the screening system according to Fig. 3;

[0042] Fig. 8 shows a schematic sectional view of another embodiment of a sieve system for the household dishwasher according to Fig. 1;

[0043] Fig. 9 shows a schematic development of an embodiment of a separation screen for the filter system according to Fig. 8;

[0044] Fig. 10 shows a further schematic plan view of the screening system according to Fig. 3;

[0045] Fig. 11 shows a schematic sectional view of the screening system according to Fig. 3;

[0046] Fig. 12 shows a further schematic sectional view of the screening system according to Fig. 3;

[0047] Fig. 13 shows a further schematic plan view of the separating sieve according to Fig. 7;

[0048] Fig. 14 shows a further schematic plan view of the separating sieve according to Fig. 7;

[0049] Fig. 15 shows a further schematic sectional view of the screening system according to Fig. 3;

[0050] Fig. 16 shows a schematic partial sectional view of an embodiment of a bearing cone for the screening system according to Fig. 3;

[0051] Fig. 17 shows a further schematic plan view of the separating sieve according to Fig. 7;

[0052] Fig. 18 shows a schematic sectional view of the separating sieve along the section line XVIII-XVIII of Fig. 17; Fig. 19 shows another schematic sectional view of the household

[0053] Dishwasher according to Fig. 1 ; and

[0054] Fig. 20 shows a schematic block diagram of a method for operating the household dishwasher according to Fig. 1.

[0055] In the figures, identical or functionally equivalent elements have been given the same reference numerals unless otherwise stated.

[0056] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a washing container 2, which can be closed, in particular watertight, by a door 3. For this purpose, a sealing device can be provided between the door 3 and the washing container 2. The washing container 2 is preferably cuboid-shaped. The washing container 2 can be arranged in a housing of the household dishwasher 1. The washing container 2 and the door 3 can form a washing chamber 4 for washing dishes.

[0057] The door 3 is shown in its open position in Fig. 1. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at a lower end of the door 3. With the help of the door 3, a loading opening 6 of the washing container 2 can be closed or opened. The washing container 2 has a base 7, a ceiling 8 arranged opposite the base 7, a rear wall 9 arranged opposite the closed door 3 and two side walls 10, 11 arranged opposite one another. The base 7, the ceiling 8, the rear wall 9 and the side walls 10, 11 can be made, for example, from a stainless steel sheet. Alternatively, the base 7 can be made, for example, from a plastic material.

[0058] The household dishwasher 1 further comprises at least one dishware receptacle 12 to 14. Preferably, several, for example three, dishware receptacles 12 to 14 can be provided, wherein the dishware receptacle 12 can be a lower dishware receptacle or a lower basket, the dishware receptacle 13 can be an upper dishware receptacle or an upper basket, and the dishware receptacle 14 can be a cutlery drawer. As Fig. 1 further shows, the dishware receptacles 12 to 14 are arranged one above the other in the washing compartment 2. Each dishware receptacle 12 to 14 can be selectively moved into or out of the washing compartment 2. In particular, each dishware receptacle 12 to 14 can be pushed or moved into the washing compartment 2 in an insertion direction E and pulled or moved out of the washing compartment 2 in a pull-out direction A opposite to the insertion direction E.

[0059] Fig. 2 shows a highly schematic sectional view of the household dishwasher 1.

[0060] In addition to the washing tub 2, the household dishwasher 1 comprises a base support 15, which supports the washing tub 2. The base support 15 is, for example, a plastic component, in particular an injection-molded plastic component. The base support 15 is box-shaped or cuboid-shaped. A direction of gravity g is oriented from top to bottom in the orientation shown in Fig. 2. The household dishwasher 1 is assigned a coordinate system with a width direction or x-direction x, a height direction or y-direction y, and a depth direction or z-direction z. The directions x, y, z are oriented perpendicular to one another.

[0061] A pump sump 16 is provided at the base 7. The pump sump 16 is pot-shaped and extends downward from the base 7 in the orientation shown in Fig. 2. The pump sump 16 can be a plastic component, in particular an injection-molded plastic component. A sieve system 17 comprises a surface filter or a surface sieve 18 that covers the pump sump 16 at least in sections. The surface sieve 18 replaces the base 7 of the washing container 2 at least in sections.

[0062] The screening system 17 further comprises a separating filter or a separating screen 19, which is arranged at least in sections within the pump sump 16. The separating screen 19 separates the pump sump 16 into a raw area 20 and a clean area 21 and can, for example, be plate-shaped. Rinse liquor and / or fresh water F can enter the clean area 21 through the flat screen 18. Furthermore, rinse liquor and / or fresh water F can flow through the separating screen 19 from the raw area 20 into the clean area 21 and vice versa. The raw area 20 can also be referred to as the dirty area. The clean area 21 can also be referred to as the circulation area.

[0063] A drain 22 flows out of the pump sump 16, particularly from the raw area 20. A drain pump 23 is connected to the drain 22. With the help of the drain pump 23, contaminated rinse water and / or fresh water F can be pumped out via a wastewater line 24. The wastewater line 24 can be connected to a stationary drain of a building.

[0064] Furthermore, an outlet 25 leads from the pump sump 16, in particular from the clean area 21. A circulation pump 26 is connected to the outlet 25. With the aid of the circulation pump 26, wash liquor and / or fresh water F can be circulated in the wash chamber 4. The circulation pump 26 is in particular a heating pump and can therefore also be referred to as such. The circulation pump 26 is designed to circulate wash liquor and / or fresh water F. Furthermore, the circulation pump 26 is also designed to introduce heat into the wash liquor and / or the fresh water F. The circulation pump 26 can be attached to the pump sump 16.

[0065] Both the drain pump 23 and the circulation pump 26 are preferably connected to a lower end of the raw area 20 or the clean area 21, i.e., to an area of ​​the pump sump 16 facing away from the flat screen 18. Accordingly, the outlets 22 and 25 are each arranged in the lower half, preferably in the lower third, of the pump sump 22. In order to completely or as completely prevent the retention of residual water after pumping by the drain pump 23, the outlet 22 for the drain pump 23 can be arranged at the lowest point of the raw area 20.

[0066] The circulation pump 26 is in fluid connection with a water diverter 27. The water diverter 27 can be integrated into the circulation pump 26. With the aid of the water diverter 27, it is possible to selectively direct the washing solution and / or the fresh water F pumped by the circulation pump 26 to different spray devices provided in the washing container 2.

[0067] 28, 29, 30. With the help of the water switch 27, the spray devices 28,

[0068] 29, 30 can be optionally supplied with wash liquor and / or fresh water F or not. The spray devices 28, 29, 30 can be spray arms, but the spray device 30 can also be designed as a roof rotor. In addition, further spray devices (not shown) can be provided, which can serve, for example, to form a preferably switchable, intensive spray zone or to assist in sieve cleaning. For example, the spray device 28 is mounted below the washware holder 12 so as to be rotatable about an axis of rotation 31 on the floor 7, on the pump sump 16, on the sieve system 17 or on the circulating pump 26. The spray device 28 has spray nozzles which spray the wash liquor and / or the fresh water F in the orientation of Fig. 2 upwards into the washware holder 12 and downwards towards the sieve system 17.

[0069] The spray device 29 can be mounted on the washware holder 13 so as to be rotatable about a rotation axis 32. The spray device 29 also has spray nozzles designed to spray the wash liquor and / or fresh water F downwards and / or upwards in the orientation shown in Fig. 2. The spray device 30 can be mounted on the ceiling 8 so as to be rotatable about a rotation axis 33. The spray device 30 applies wash liquor and / or fresh water F to the washware holder 14 from above in the orientation shown in Fig. 2.

[0070] The spray device 28 is fluidly connected to the circulation pump 26, in particular to the water diverter 27, by means of a supply line 34. The circulation pump 26 can supply the spray device 28 with rinsing solution and / or fresh water F via the supply line 34.

[0071] The spray device 29 is assigned a supply line 35, which fluidically connects the spray device 29 to the circulation pump 26. The circulation pump 26 can supply the spray device 29 with rinsing solution and / or fresh water F via the supply line 35.

[0072] The spray device 30 is assigned a supply line 36, which fluidically connects the spray device 30 to the circulation pump 26. The circulation pump 26 can supply the spray device 30 with rinsing solution and / or fresh water F via the supply line 36.

[0073] Each spray device 28, 29, 30 can be assigned its own supply line 34, 35, 36. Alternatively, all spray devices 28, 29, 30 can have a common supply line that branches out. In particular, the supply lines 34, 35, 36 are formed by a common component, in particular a common plastic injection-molded component. The supply lines 34, 35, 36 are routed along the rear wall 9 from the floor 7 toward the ceiling 8. The supply lines 34, 35, 36, or at least some of the supply lines 34, 35, 36, can be routed through the sieve system 17, in particular through the flat sieve 18.

[0074] The circulation pump 26 preferably has a separate connection or fluid outlet for each supply line 34, 35, 36. The circulation pump 26, the spray devices 28, 29, 30, and the supply lines 34, 35, 36 together form a hydraulic circuit 37 of the household dishwasher 1. The circulation pump 26 circulates the wash liquor and / or the fresh water F in this hydraulic circuit 37. The circulation pump 26 can be part of the hydraulic circuit 37. However, this is not mandatory.

[0075] The household dishwasher 1 further comprises a control device 38. With the help of the control device 38, for example, different washing programs of the household dishwasher 1 can be executed. For this purpose, washing programs can be stored or stored in the control device 38. The control device 38 is preferably arranged outside the washing compartment 2.

[0076] The control device 38 can be arranged in or on the door 3. The control device 38 is preferably provided on an upper edge of the door 3 (not shown). However, the control device 38 can also be accommodated in the base support 15. The control device 38 can be operated or actuated using control elements (not shown). The control elements can comprise, for example, keys, buttons, and / or touchscreens. These can be attached to the door 3. However, operation by an external device, such as a smartphone or a tablet, via a wireless communication connection is also possible.

[0077] The control device 38 can be used to control the circulation pump 26. For example, the control device 38 can be used to turn the circulation pump 26 on and off and / or change its speed. The control device 38 can receive and evaluate information from the circulation pump 26, such as a speed of the circulation pump 26 and / or a motor current of the circulation pump 26. Furthermore, the control device 38 can also control the water diverter 27 to selectively switch the spray devices 28, 29, 30 on or off.

[0078] The wash tub 2 contains items 39 to be cleaned. These items 39 may include, for example, glasses, plates, pots, bowls, cutlery, or the like. In particular, the items 39 are accommodated in the items receptacles 12, 13, 14 (not shown in Fig. 2). Using the spray devices 28, 29, 30, the items 39 can be sprayed with wash liquor and / or fresh water F.

[0079] Fig. 3 shows a schematic plan view of an embodiment of a screening system 17 as mentioned above. Fig. 4 shows the view IV according to Fig. 3. Fig. 5 shows a side view of the screening system 17. In the following, reference is made simultaneously to Figs. 3 to 5.

[0080] The sieve system 17 comprises a surface sieve 18, as mentioned above, which is ring-segment-shaped. The surface sieve 18 has an outer edge 40, with which the surface sieve 18 can rest on the pump sump 16 and / or the bottom 7 of the rinsing container 2. Furthermore, the surface sieve 18 can be assigned an inner edge 41 facing away from the outer edge 40. A central part 74 of the sieve system 17, not shown in Fig. 3, is connected to the inner edge 41. The rotational axis 31 of the spray device 28 extends in the region of this central part 74. The spray device 28 can be mounted, for example, on the pump sump 16.

[0081] The flat screen 18 has a perforation 42, only a section of which is shown. The perforation 42 comprises a plurality of openings 43, for example in the form of bores. The openings 43 can be circular. However, the openings 43 can also be rectangular, in particular square, triangular, honeycomb-shaped, or elliptical. The flat screen 18 can be made of a plastic material and / or a metallic material. The screening system 17 is assigned a radial direction R. The radial direction R is oriented perpendicular to the axis of rotation 31 and away from it in the direction of the inner edge 41 of the flat screen 18. The flat screen 18 can be constructed, at least in sections, rotationally symmetrical to the axis of rotation 31. The filter system 17 further comprises a separating screen 19, as mentioned above, which separates the pump sump 16 into the raw area 20 and the clean area 21. The separating sieve 19 can be removed for cleaning purposes. The separating sieve 19 has a groove shown in Fig.4. The inlet opening 44 is closed with a grid-shaped coarse screen 45. The coarse screen 45 is fluid-permeable. The coarse screen 45 is suitable for preventing coarse dirt residues from entering the raw area 20 of the pump sump 16.

[0082] The separation screen 19 further comprises a raw area cover 46. The raw area cover 46 is fluid-permeable. For this purpose, the raw area cover 46 has a perforation 47 with a plurality of openings 48. The perforations 42, 47 can be identical. However, this is not mandatory.

[0083] Fig. 3 shows the spray device 28, which is mounted on the pump housing 16 for rotation about the rotation axis 31. The spray device 28 extends radially beyond the flat screen 18, viewed along the radial direction R. Facing the flat screen 18, the spray device 28 has a first dirt feed device 50, which is embodied here as a spray nozzle. Alternatively, the first dirt feed device 50 can also be a wiper, a spatula, a broom, or the like, or can also comprise multiple spray nozzles.

[0084] The first dirt feed device 50 is, in particular, a fan nozzle. The first dirt feed device 50 has a slot-shaped nozzle opening 51. With the aid of the nozzle opening 51, a fan-shaped spray jet 52 of rinsing solution and / or fresh water F can be generated, which is directed obliquely onto the flat screen 18. The first dirt feed device 50 can also be referred to as the first screen cleaning nozzle.

[0085] Furthermore, the spray device 28 has a second dirt feed device 53, which here is also designed as a spray nozzle. The second dirt feed device 53 is also a fan nozzle. Alternatively, the second dirt feed device 53 can also be a wiper, a spatula, a broom or the like, or can again comprise several spray nozzles. The second dirt feed device 53 has a slot-shaped nozzle opening 54, which is designed to generate a fan-shaped spray jet 55 of rinsing liquor and / or fresh water F. In the illustrated embodiment, the nozzle openings 51, 54 are oriented obliquely to one another, but can also be aligned parallel to one another. The spray jet 55 of the second dirt feed device 53 is oriented counter to the radial direction R and obliquely to the surface sieve 18. The spray jets 52, 55 of the two dirt feed devices 50 and 53 can overlap.However, this is not absolutely necessary. Instead of two dirt feed devices 50, 53, exactly one dirt feed device (not shown) can be provided. Furthermore, more than two dirt feed devices 50, 53 can also be provided. The second dirt feed device 53 can also be referred to as a second screen cleaning nozzle. Ultimately, the only decisive factor is that the number, arrangement, and design of the dirt feed device or devices are suitable for cleaning at least the majority of, preferably the entire, surface of the flat screen 18 facing the rinsing container 2.

[0086] The functionality of the filter system 17 is explained below. During operation of the household dishwasher 1, the spray device 28 rotates in a direction of rotation D about the axis of rotation 31. The direction of rotation D can be oriented clockwise. To drive the spray device 28, drive nozzles can be provided from which wash liquor and / or fresh water F emerges in order to set the spray device 28 in motion in the direction of rotation D. In this case, the spray device 28 is recoil-driven or passively driven. However, the spray device 28 can also be actively driven. In this case, a drive element, in particular in the form of an electric motor, is provided to drive the spray device 28.

[0087] Soiling 56 may be located on the floor 7 and / or on the surface sieve 18 and / or on the central section 74 of the sieve system 17. The soiling 56 may comprise food residues in solid and liquid form. The spray device 28 rotates in the direction of rotation D, and the soil advancing devices 50, 53 are in operation and are subjected to rinsing liquor and / or fresh water F, so that the spray jets 52, 55 are formed. With the aid of the spray jet 55, the soiling 56 is rinsed radially away from the floor 7 onto the surface sieve 18, counter to the radial direction R. The spray jet 52, on the other hand, rinses the soiling 56 along the direction of rotation D in the direction of the inlet opening 44, at which the coarse sieve 45 is provided. The spray jet 52 flushes the soiling 56 through the coarse sieve 45 into the inlet opening 44 of the raw area 20. Particularly large portions of the soiling 56 remain stuck to the coarse sieve 45 and can be removed manually.The soiling 56 is then passed together with rinsing liquor and / or fresh water F through the inlet opening 44 into the raw area 20 of the pump sump 16, thereby forming a coarse screen volume flow VG of rinsing liquor and / or fresh water F. In other words, all of the soiling 56 and all of the rinsing liquor and / or fresh water F that penetrates the pump sump 16 through the inlet opening 44 is passed into the raw area 20. At the same time, rinsing liquor and / or fresh water F can enter the clean area 21 through the surface screen 18, thereby forming a surface screen volume flow VL.

[0088] There is no direct fluid connection between the inlet opening 44 and the clean area 21. However, the separating screen 19 has a fluid-permeable separating screen filter section 49 in the area where it separates the raw area 20 from the clean area 21. Rinse liquor and / or fresh water F can reach the clean area 21 if they pass through the separating screen filter section 49, thereby forming a separating screen volume flow VF. Rinse liquor and / or fresh water F that passes through the flat screen 18 is directed exclusively into the clean area 21.

[0089] When the circulation pump 26 is running, the rinsing liquor and / or fresh water that has reached the clean area 21 via the flat screen 18 is distributed to the spray devices 28, 29, 30 via the water diverter 27 and the supply lines 34, 35, 36. However, rinsing liquor and / or fresh water from the raw area 20 also initially reaches the clean area 21 through the separating screen filter section 49 of the separating screen 19 and from there also into the hydraulic circuit. In the process, however, the soiling 56 contained in the rinsing liquor and / or fresh water F of the raw area 20 is filtered out of the rinsing liquor and / or fresh water F with the aid of the separating screen filter section 49. The separating screen filter section 49 becomes clogged with components of the soiling 56. In order to clean the separating screen filter section 49, the circulation pump 26 is switched off and the drain pump 23 is switched on.

[0090] The drain pump 23 now pumps the rinse liquor and / or fresh water F together with the soiling 56 contained therein from the uncleaned area 20. Due to the suction force of the drain pump 23 in the uncleaned area 20, however, rinse liquor and / or fresh water from the clean area 21 is also sucked through the separating screen filter section 49 of the separating screen 19, thereby flushing the separating screen filter section 49. The soiling 56 thereby detached from the separating screen filter section 49 is then pumped out with the aid of the drain pump 23. Manual cleaning of the separating screen 19, in particular of the separating screen filter section 49, is thus advantageously dispensed with. The separating screen 19 is thus self-cleaning.

[0091] Fig. 6 shows a further schematic plan view of the filter system 17. Fig. 7 shows a schematic view of the separation sieve 19.

[0092] The surface sieve 18 of the sieve system 17 forms a fluid-permeable surface sieve surface A1, which is shown hatched in Fig. 6. The surface sieve surface A1 preferably does not represent a closed ring, but rather a ring segment, which is supplemented by the raw area cover 46, which is shown double-hatched in Fig. 6, such that the surface sieve 18 together with the raw area cover has a ring shape, or in the event that the raw area cover 46, as shown in Fig. 5, extends obliquely to the surface sieve 18, the projection of the surface sieve 18 and the raw area cover 46 from vertically above represents a closed ring.

[0093] The raw area cover 46, which can be part of the separation screen 19 or the flat screen 18 or can also form a separate unit, is fluid-permeable. For this purpose, the raw area cover 46 has a perforation 47 with a plurality of openings 48. Rinse liquor and / or fresh water F passing through the perforation 47 of the raw area cover 46 is directed exclusively into the raw area 20 as part of the coarse filter volume flow VG.

[0094] In particular, only the separating screen filter section 49 of the separating screen 19 is shown in Fig. 7. The separating screen filter section 49 is fluid-permeable and has a separating screen area A2.

[0095] The ratio of the surface sieve area A1 to the separating sieve area A2 must have a lower limit of greater than or equal to 5 to 1. Possible upper limits of the above-mentioned ratio can be less than or equal to 30 to 1, 20 to 1, 15 to 1, 10 to 1,

[0096] 8 to 1 or 6 to 1. Therefore, the following applies:

[0097] Al: A 2 > 5: 1

[0098] Furthermore, the following may also apply:

[0099] A1:A2 < 30:1

[0100] This aforementioned ratio of the screen surfaces A1, A2 to one another allows, on the one hand, the best possible filtering effect to be achieved with the highest possible volume flows of rinse liquor and / or fresh water F, and, on the other hand, an increased flow through the separating screen surface A2 during operation of the drain pump 23. This simplifies and improves the cleaning of the separating screen 19.

[0101] Fig. 8 shows a schematic sectional view of another embodiment of a screening system 17A. Fig. 9 shows a schematic development of an embodiment of a separating screen 19A for the filter system 17A. In the following, reference is made simultaneously to Figs. 8 and 9.

[0102] In contrast to the separating screen 19 of the filter system 17, the separating screen 19A of the filter system 17A is not plate-shaped or flat, but cylindrical. The separating screen 19A can be constructed rotationally symmetrically to the rotation axis 31. The separating screen 19A is accommodated in the pump sump 16 and separates it into the raw area 20, which is provided inside the separating screen 19A, and the clean area 21, which is provided outside the separating screen 19A. The drain pump 23 is connected to the raw area 20. The circulation pump 26 is connected to the clean area 21.

[0103] The separation screen 19A has a separation screen filter section 57 which is fluid-permeable.

[0104] The separating screen filter section 57 has a perforation 58 (shown in detail) with a plurality of openings 59. In the orientation of Figs. 8 and 9, the separating screen filter section 57 is provided at a lower end of the separating screen 19A. The separating screen filter section 57 is thus arranged at an end section of the separating screen 19A facing away from the flat screen 18. The separating screen filter section 57 has a height h57.

[0105] Furthermore, the separating screen 19A comprises a jacket section 60 that is not fluid-permeable. The jacket section 60 directly adjoins the separating screen filter section 57.

[0106] The shell section 60 and the separating screen filter section 57 together have a height h60. The height h57 of the separating screen filter section 57 is a maximum of 25% of the height h60.

[0107] A coarse filter 61 adjoins the casing section 60. The casing section 60 is thus arranged between the separating sieve filter section 57 and the coarse filter 61. The coarse filter 61 comprises a plurality of openings 62.

[0108] During operation of the filter system 17A, rinse liquor and / or fresh water F enters the clean area 21 through the flat screen 18. At the same time, rinse liquor and / or fresh water F enters the raw area 20 through the coarse filter 61. The rinse liquor and / or fresh water F are then filtered by the separating screen filter section 57 when they enter the clean area 20 from the raw area 20 through the separating screen filter section 57 while the circulation pump 26 is running. In the process, the separating screen filter section 57 becomes clogged with contaminants.

[0109] To clean the separating screen filter section 57, the circulation pump 26 is switched off and the drain pump 23 is switched on. Rinse liquor and / or fresh water F then flows from the clean area 21 through the separating screen filter section 57 into the dirty area 20. This rinses the separating screen filter section 57 clean. By keeping the separating screen filter section 57 as small as possible in terms of area, improved flow dynamics are achieved at the separating screen filter section 57, which results in improved self-cleaning of the separating screen 19A.

[0110] The advantages of a separating screen filter section 57, which is arranged at an end section of the separating screen 19A facing away from the flat screen 18, were illustrated here using a filter system 17A with a cylindrical separating screen 19A, but of course apply equally to embodiments with a plate-shaped or flat separating screen 17 according to Figures 2 to 7. Figure 10 shows a further schematic plan view of the filter system 17.

[0111] In Fig. 10, the flat screen 18 is not shown. Of the separating screen 19, only the separating screen filter section 49 is shown, which separates the pump sump 16, at least in a partial area, into the raw area 20 and the clean area 21. The pump sump 16 is shown as cylindrical, with the raw area 20 and the clean area 21 being the same size. However, the pump sump 16 can have any desired geometry. The raw area 20 and the clean area 21 can be different sizes.

[0112] Particularly preferably, the drain pump 23 and the circulation pump 26 are arranged such that the pump sump 16 is placed between the drain pump 23 and the circulation pump 26. However, this arrangement is not mandatory. The aforementioned arrangement of the pump sump 16, the drain pump 23, and the circulation pump 26 allows a flow of the wash liquor and / or the fresh water F to be oriented perpendicularly or at least approximately perpendicularly to the separation screen filter section 49, both from the raw area 20 through the separating screen filter section 49 into the clean area 21 and from the clean area 21 through the separating screen filter section 49 into the raw area 20.

[0113] In particular, for cleaning the separating screen filter section 49, for which the circulation pump 26 is switched off and the drain pump 23 is switched on, a suction force of the drain pump 23 acts homogeneously across the previously explained separating screen surface A2 (Fig. 7). A flow of the rinse liquor and / or the fresh water is designated by reference numeral 63 in Fig. 10. The flow 63 is oriented perpendicular to the separating screen filter section 49 or the separating screen surface A2. This leads to the most uniform self-cleaning possible of the separating screen 19, in particular of the separating screen filter section 49, due to the high dynamics acting on the separating screen filter surface A2.

[0114] 11 and 12 each show a further schematic sectional view of the filter system 17. Figs. 13 and 14 each show a further schematic plan view of the separating screen 19, in particular of the separating screen filter section 49 of the separating screen 19. In the following, reference is made simultaneously to Figs. 11 to 14. The separating screen 19 or the separating screen filter section 49 has the task of separating the raw area 20 and the clean area 21 from one another in such a way that dirt particles 64 of a certain size remain in the raw area 20. At the same time, an exchange of rinsing liquor and / or fresh water F must be possible between the raw area 20 and the clean area 21 and vice versa. The coarse filter volume flow VG (Fig. 5) of rinsing liquor and / or fresh water F, which flows into the raw area 20 via the inlet opening 44, must flow through the separating screen filter section 49 with a defined filter stage into the clean area 21.This exchange of rinsing liquor and / or fresh water F must be maintained even if the separating sieve filter section 49 is partially closed, for example if it is clogged with dirt particles 64.

[0115] To always enable the aforementioned exchange of rinsing liquor and / or fresh water F between the raw area 20 and the clean area 21, the separating sieve filter section 49 has a first perforation area 65 with a first perforation 66. The first perforation 66 is formed by a plurality of openings 67, which may be circular. The openings 67 each have a cross-sectional area A67, shown hatched. The first perforation area 65 has a height h65.

[0116] Furthermore, the separating screen filter section 49 has a second perforation region 68, which, viewed along the vertical direction y, is arranged above the first perforation region 65. The second perforation region 68 has a second perforation 69. The second perforation 69 is formed by a plurality of openings 70, which may be circular. The openings 70 each have a cross-sectional area A70, shown hatched. The cross-sectional area A70 is preferably at least as large as the cross-sectional area A67. The openings 70 may have a larger diameter than the openings 67. The second perforation region 68 has a height h68. The total area of ​​all openings 67 of the first perforation 66 is comparable in size to the total area of ​​all openings 70 of the second perforation 69.The total areas of all openings 67 in the first perforation 66 and the total area of ​​all openings 70 in the second perforation 69 should therefore not differ from one another by more than 30%, preferably by no more than 20%, more preferably by no more than 10%, and particularly preferably by no more than 5%. Any number of perforation regions 65, 68 can be provided. The perforation regions 65, 68 can be directly adjacent to one another. Optionally, a perforation-free region 71 that is impermeable to fluids can be provided between the perforation regions 65, 68. However, the region 71 is not necessarily perforated. The region 71 can also have a perforation. This perforation can have openings that are larger in diameter and / or cross-sectional area than the openings 67 in the first perforation 66 and smaller than the openings 70 in the second perforation 69.

[0117] During normal operation, the exchange of rinsing solution and / or fresh water F takes place via the first perforation area 65. With high dirt loads or when the first perforation area 65 becomes progressively clogged, the exchange of rinsing solution and / or fresh water F also takes place, at least in part, via the second perforation area 68, and rinsing operation can be maintained without a noticeable deterioration in rinsing performance. If the second perforation area 68 were not present, the raw area 20 could overflow, and dirt particles 64 of all sizes would be fed into the hydraulic circuit 37. This would result in noticeably poorer rinsing performance.

[0118] In Figs. 11 and 13, a liquid level of the rinsing liquor and / or the fresh water F in the pump sump 16 during normal operation is designated by reference numeral 72. In Figs. 12 and 14, a liquid level of the rinsing liquor and / or the fresh water F in the pump sump 16 at a high dirt load is designated by reference numeral 73. The liquid level 73 is higher than the liquid level 72. The two liquid levels 72, 73 do not exist simultaneously, but rather show two different states resulting from two different dirt loads.

[0119] 11 and 12. The check valve 93 is part of the separating screen 19 and is preferably arranged at an end section of the separating screen 19 facing away from the flat screen 18. The check valve 93 is arranged and aligned such that when the circulating pump 26 is operating, i.e. when rinse liquor and / or fresh water F flows from the raw area 20 into the clean area 21, the check valve 93 closes and / or is closed. In Fig. 11, the check valve 93 is shown closed. Flow through the check valve 93 is not possible during this operating state. When the drain pump 23 is operating, however, the check valve 93 opens or remains open. In Fig. 12, the check valve 93 is shown open. Rinse liquor and / or fresh water F can flow from the clean area 21 through the non-return valve 93 into the raw area 20 and be pumped out by the drain pump 23.This can be particularly advantageous if the separating screen filter section 49 is clogged with dirt particles 94, particularly on the side of the separating screen filter section 49 facing the clean area 21. This is because pumping out the rinse liquor and / or the fresh water F can thus take place even if the separating screen filter section 49 is clogged as described above. The dirt particles 94 in the clean area 21 are smaller than the dirt particles 64 in the unclean area 20.

[0120] The check valve 93 is arranged at an end section of the separating screen 19 facing away from the flat screen 18. The check valve 93 is thus arranged particularly close to the outlet 22 associated with the drain pump 23. As a result, when the drain pump 23 is operating, the smallest possible area of ​​the separating screen 19 and / or the separating screen filter section 49 is influenced by the flow through the check valve 93. This ensures that dirt particles 94 are detached from the separating screen filter section 49 even when the check valve 93 is open, thus cleaning the separating screen 19.

[0121] Fig. 15 shows another schematic sectional view of the screening system 17.

[0122] The pump sump 16 and the separating sieve 19 are not shown in Fig. 15. A central part 74 of the sieve system 17 is arranged within the ring- or ring-segment-shaped surface sieve 18, on which central part the spray device 28 is mounted so as to be rotatable about the axis of rotation 31. However, the spray device 28 can also be mounted on another component in this area, in particular on the pump sump 16. The central part 74 is conical or pyramid-shaped and comprises a central filter section 75 which is permeable to fluid. In the exemplary embodiment shown, the central part 74 also comprises a bearing pin 76 provided on the top of the central filter section 75 in the orientation of Fig. 15, on which bearing pin the spray device 28 is mounted so as to be rotatable about the axis of rotation 31. If the spray device 75 is mounted in a different way, the central part 74 does not have a bearing pin 76.The central part 74 and the central filter section 75 are not accessible to the spray jets 52, 55 or are only accessible to a limited extent and therefore cannot be cleaned with the spray jets 52, 55. However, the central filter section 75 should not become dirty on either side, i.e., on the outside facing the rinsing container 2 or on the inside facing the pump sump 16. Furthermore, the rinsing solution and / or the fresh water F should be returned to the pump sump 16 as quickly as possible, which leads to a reduction in circulation, and has a venting function. Furthermore, the rinsing performance should not be negatively affected. To enable cleaning of the central filter section 75 and simultaneous venting, the central filter section 75 is perforated.

[0123] Fig. 16 shows a schematic partial sectional view of the central filter section 75.

[0124] The central filter section 75 has a wall 77 surrounding the rotation axis 31, with an outer side 78 and an inner side 79 facing away from the outer side 78. As previously mentioned, the central filter section 75 is perforated and comprises a perforation 80 with a plurality of openings 81 that penetrate the wall 77. The openings 81 can have a frustoconical geometry and taper from the inner side 79 toward the outer side 78. The wall 77 is inclined at an angle of inclination a relative to the rotation axis 31. The angle of inclination a can be, for example, 4° to 85°.

[0125] The conical or pyramidal shape of the central part 74 enables rapid and targeted transport of rinsing liquor and / or fresh water F, in particular an acceleration of the rinsing liquor and / or fresh water F as well as dirt transport on the outer side 78 of the wall 77 in the case of dirt particles 64 that are larger than the openings 81 of the perforation 80, as shown by an arrow 82 (Fig. 15), in the direction of the flat sieve 18. Thus, all dirt particles 64 that are larger than the openings 81 of the perforation 80 are specifically fed to the flat sieve 18 and then transported to the inlet opening 44 (Fig. 4) with the aid of the dirt feed devices 50, 53. This leads to a rapid return of rinsing liquor and / or fresh water F and rapid dirt transport. Through the perforation 80 of the central part filter section 75, the central part 74 is flowed through with rinsing liquor and / or fresh water F.As a result, a portion of the rinsing solution and / or fresh water F also flows along the inner side 79 of the central filter section 75, actively cleaning and keeping the inner side 79 clean, although the inner side 79 could become contaminated by splash water and foam 83. In particular, dirt particles 64 that are smaller than the openings 81 of the perforation 80 can be rinsed off the inner side, as indicated by arrows 84. The dirt particles 64 can, for example, be carried to the inner side 79 with the foam 83, as indicated by arrows 85. This prevents contamination of the inner side 79.

[0126] The perforation 80 is to be selected such that all functions are maintained and not impaired by dirt particles 64 introduced into the downstream hydraulic circuit 37. This means that the flushing performance is not affected. Furthermore, the perforation 80 enables the venting of an interior space 86 enclosed by the central filter section 75 of air that could collect below it if the central filter section were closed. The venting of the interior space 86 is indicated by arrows 87, 88. As previously mentioned, the perforation 80, in particular the openings 81, are conical, so that the openings 81 have a smaller diameter on the outer side 78 than on the inner side 79.

[0127] Fig. 17 shows a further schematic plan view of the separating sieve 19. Fig. 18 shows a schematic sectional view of the separating sieve 19 according to the section line XVII l-XVI II of Fig. 17. In the following, reference is made simultaneously to Figs. 17 and 18.

[0128] In particular, only the separating screen filter section 49 of the separating screen 19 is shown in Figs. 17 and 18. As previously mentioned, the separating screen filter section 49 has a first perforation area 65 with a first perforation 67 and a second perforation area 68 with a second perforation 69.

[0129] The first perforation area 65 can be at least partially covered by a protective shield 89, which is connected to the area 71 of the separating screen filter section 49 by a connecting section 90. The protective shield 89 is arranged at a distance a from the first perforation area 65. The distance a can be, for example, 1 to 20 mm. The protective shield 89 is fluid-impermeable or at least less fluid-permeable than the separating screen filter section (49). The protective shield 89 is arranged within the clean area 21 of the pump sump 16.

[0130] With the help of the protective shield 89, the strain on the first perforation area 65 caused by dirt on the side of the drain pump 23 can be reduced during circulation operation. A suction effect or a volume flow through the first perforation area 65 toward the circulation pump 26 is reduced to prevent or at least reduce the burying of dirt particles 64 in the first perforation area 65.

[0131] The suction effect or the volume flow through the first perforation area 65 is reduced by the protective shield 89. The protective shield 89 represents a hydraulic resistance. Preferably, the protective shield 89 is mounted on the suction side of the circulation pump 26 in the clean area 21 and directly in front of the first perforation area 65 in order to reduce the volume flow or the flow velocity of the rinsing liquor and / or the fresh water F through the first perforation area 65.

[0132] Due to the slow flow, less dirt is introduced and less dirt particles 64 are drawn into and / or buried in the first perforation 66, and can thus be more easily removed from the separating screen filter section 49 when the rinse liquor and / or fresh water F are pumped out. Due to the opposite flow during the pumping out of the rinse liquor and / or fresh water F, the dirt particles 64 adhering to the separating screen filter section 49 are easily removed, ensuring the permeability of the separating screen filter section 49.

[0133] The protective shield 89 thus generates a hydraulic resistance which reduces the dirt load on the separating sieve filter section 49 in order to easily remove the dirt particles 64 during the pumping process. When the wash liquor and / or the fresh water F is pumped out, the flow around the protective shield 89 is such that the greatest possible turbulence and flow through the separating sieve filter section 49, in particular the first perforation 65, takes place in order to ensure the function of the separating sieve 19 over the service life of the household dishwasher 1. Fig. 19 shows a further schematic sectional view of the household dishwasher 1. Fig. 20 shows a schematic block diagram of a method for operating the household dishwasher 1. Reference is made below to Figs. 19 and 20 simultaneously.

[0134] To rinse the wash ware 39, a detergent 91 is required, which is introduced into the hydraulic circuit 37 in powder, gel, or tab form via a detergent dispenser. When a detergent lid of the detergent dispenser is opened, the detergent 91 enters the wash chamber 4. If the detergent 91 is a tab, it either falls into a defined dissolving position, in particular into a so-called tab tray, or falls undefined into the wash chamber 4 and is dissolved there via the returning wash liquor and / or the fresh water F and effectively distributed over the wash ware 39.

[0135] If an annular surface sieve 18 and dirt feed devices 50, 53 for actively cleaning the surface sieve 18 are provided as previously explained, the cleaning agent 91, particularly if it is in powder form, could be flushed into the inlet opening 44 (Fig. 4) without additional measures and pumped out of the raw area 20 by means of the drain pump 23, without the cleaning agent 91 being able to exert its cleaning effect. The result would be a significantly reduced washing performance, since a lower concentration of cleaning enzymes would be effective on the items 39 to be washed. This must be prevented by additional measures to be explained below.

[0136] When the detergent addition is activated, the active dirt transport with the help of the dirt feed devices 50, 53 and thus the unwanted transport of the detergent 91 into the untreated area 20 is at least partially deactivated and thus rendered ineffective. Several options are available for this. Firstly, the spray device 28 can not be activated within a first time interval S1 between the opening of the detergent addition until the dissolution of the detergent 91. This means that the spray device 28 is not subjected to rinsing liquor and / or fresh water F. An unwanted transport of the detergent 91 into the untreated area 20 is thus avoided or at least significantly reduced. During the dissolution of the detergent 91, all other spray devices 29, 30 can be active except for the spray device 28. Secondly, it is possible to apply a low spray pressure to the spray device 28 until the cleaner 91 is dissolved.This prevents rotation of the spray device 28 and thus active dirt transport. The cleaner 91 is thus not inadvertently transported into the dirty area 20.

[0137] Thirdly, an increase in the liquid level 92 of the wash liquor and / or the fresh water F, or an increase in the bath volume in the wash chamber 4, is possible during the wash operation up to above the flat screen 18, so that active screen cleaning and dirt transport are no longer possible. The cleaning agent 91 can thus dissolve in the wash liquor and / or the fresh water F and remains in the hydraulic circuit 37.

[0138] Fourthly, the use of dynamic dirt feed devices 50, 53 is possible, which only open above a certain pressure. During the activation of the detergent addition or during the dissolution of the detergent 91, the spray pressure is so low that the dirt feed devices 50, 53 remain inactive and thus transport neither dirt nor the detergent 91 into the uncleaned area 20. Only after the dissolution of the detergent 91, during a second time interval S2, are the dirt feed devices 50, 53 subjected to a higher spray pressure and spray out rinsing solution and / or fresh water F. A combination of the aforementioned options can also be used.

[0139] With the aforementioned measures, it is thus possible to prevent the unwanted entry of the cleaner 91 into the raw area 20. The effectiveness of the cleaner 91 and the flushing performance can be ensured. The cleaner 91 remains safely in the hydraulic circuit 37.

[0140] Although the present invention has been described using exemplary embodiments, it is susceptible to numerous modifications. Reference symbols used:

[0141] 1 household dishwasher

[0142] 2 rinsing containers

[0143] 3 Door

[0144] 4 Washing-up area

[0145] 5 swivel axis

[0146] 6 Loading opening

[0147] 7 Floor

[0148] 8 Ceiling

[0149] 9 Rear wall

[0150] 10 Side wall

[0151] 11 Side wall

[0152] 12 Dishwasher waste holder

[0153] 13 Dishwasher drawer

[0154] 14 Dishwasher waste holder

[0155] 15 base supports

[0156] 16 Pump sump

[0157] 17 Screening system

[0158] 17A screening system

[0159] 18 Flat sieve

[0160] 19 Separating sieve

[0161] 19A Separating sieve

[0162] 20 Raw area

[0163] 21 Clean area

[0164] 22 Procedure

[0165] 23 Drain pump

[0166] 24 sewer line

[0167] 25 Procedure

[0168] 26 Circulation pump

[0169] 27 Water switch

[0170] 28 Spray device

[0171] 29 Spray device

[0172] 30 Spray device 31 Rotation axis

[0173] 32 axis of rotation

[0174] 33 axis of rotation

[0175] 34 supply line

[0176] 35 supply line

[0177] 36 supply line

[0178] 37 Hydraulic circuit

[0179] 38 Control device

[0180] 39 items to be washed

[0181] 40 outer edge

[0182] 41 inner edge

[0183] 42 holes

[0184] 43 Breakthrough

[0185] 44 Inlet opening

[0186] 45 coarse sieve

[0187] 46 Raw area coverage

[0188] 47 holes

[0189] 48 Breakthrough

[0190] 49 Separating sieve filter section

[0191] 50 dirt feed device

[0192] 51 Nozzle opening

[0193] 52 spray jet

[0194] 53 Dirt feed device

[0195] 54 Nozzle opening

[0196] 55 spray jet

[0197] 56 Soiling

[0198] 57 Separating sieve filter section

[0199] 58 holes

[0200] 59 Breakthrough

[0201] 60 jacket section

[0202] 61 coarse filters

[0203] 62 Breakthrough

[0204] 63 Current

[0205] 64 Dirt particles 65 Hole area

[0206] 66 holes

[0207] 67 Breakthrough

[0208] 68 punching area

[0209] 69 holes

[0210] 70 Breakthrough

[0211] 71 Area

[0212] 72 Fluid level

[0213] 73 Fluid level

[0214] 74 bearing cones

[0215] 75 cone section

[0216] 76 bearing journals

[0217] 77 wall

[0218] 78 Outside

[0219] 79 Inside

[0220] 80 holes

[0221] 81 Breakthrough

[0222] 82 Arrow

[0223] 83 foam

[0224] 84 Arrow

[0225] 85 Arrow

[0226] 86 Interior

[0227] 87 Arrow

[0228] 88 Arrow

[0229] 89 Protective Shield

[0230] 90 connecting section

[0231] 91 cleaners

[0232] 92 Fluid level

[0233] 93 Check valve

[0234] 94 dirt particles a distance

[0235] A Extension direction

[0236] A1 Flat screen area A2 Separating screen area

[0237] A67 Cross-sectional area

[0238] A70 cross-sectional area

[0239] D Direction of rotation

[0240] E Insertion direction

[0241] F Rinse solution and / or fresh water g Direction of gravity h57 Height h60 Height h65 Height h68 Height

[0242] R Radial direction

[0243] 51 Time interval

[0244] 52 time interval

[0245] VF separating screen volume flow

[0246] VG coarse screen volume flow

[0247] VL Surface sieve volume flow x x-direction y y-direction z z-direction a Inclination angle

Claims

PATENT CLAIMS 1. Household dishwasher (1) with a washing container (2) for receiving wash ware (39), a pump sump (16) provided on the washing container (2), a sieve system (17), a drain pump (23) and a circulation pump (26), wherein the sieve system (17) has a surface sieve (18) which covers the pump sump (16) at least in sections, wherein the sieve system (17) has a separating sieve (19) which separates the pump sump (16) into a raw area (20) and a clean area (21), wherein the drain pump (23) is connected to the raw area (20) and the circulation pump (26) is connected to the clean area (21), wherein the separating sieve (19) has a fluid-permeable separating sieve filter section (49), wherein the separating sieve filter section (49) has a first perforation area (65) with a first perforation (66) and a second perforation area (68) separated from the first perforation area (65) with a second perforation (69) different from the first perforation (66),and wherein, starting from the first perforation area (65), the second perforation area (68) is arranged facing the surface screen (18).

2. Household dishwasher according to claim 1, characterized in that openings (70) of the second perforation (69) are at least twice, preferably three times, particularly preferably four times as large as openings (67) of the first perforation (66).

3. Household dishwasher according to claim 1 or 2, characterized in that a total area of ​​all openings (67) of the first perforation (66) is comparable in size to a total area of ​​all openings (70) of the second perforation (69).

4. Household dishwasher according to claim 3, characterized in that the total areas of all openings (67) of the first perforation (66) and the total area of ​​all openings (70) of the second perforation (69) differ from each other by no more than 30%, preferably by no more than 20%, more preferably by no more than 10%, particularly preferably by no more than 5%.

5. Household dishwasher according to claim 3 or 4, characterized in that a height (h86) of the second perforation area (68) is a maximum of 66%, preferably a maximum of 50%, more preferably a maximum of 33% or particularly preferably a maximum of 20% of the height (h65) of the first perforation area (65).

6. Household dishwasher according to one of claims 1 - 5, characterized in that the separating sieve filter section (49) has a region (71) which is arranged between the first perforation region (65) and the second perforation region (68) with respect to a vertical direction, wherein the region (71) is free of perforations or has a perforation which is formed by openings which are larger in diameter and / or cross-sectional area than the openings (67) of the first perforation (66) and smaller than the openings (70) of the second perforation (69).

7. Household dishwasher according to one of claims 1-6, characterized in that the separating sieve filter section (49) is flat.

8. Household dishwasher according to one of claims 1 - 7, characterized in that the separating sieve filter section (49), at least in a partial area, is oriented at an angle between 45° and 90°, in particular perpendicular to the surface sieve (18).

9. Household dishwasher according to one of claims 1 - 8, characterized in that the separating sieve (19) has a non-return valve (93) which can only be opened for a volume flow from the clean area (21) into the dirty area (20).

10. Household dishwasher according to claim 9, characterized in that one of the perforated areas (65, 68) is formed by the non-return valve (93).

11. Household dishwasher according to claim 9 or 10, characterized in that the non-return valve (93) is arranged on an end section of the separating sieve (19A) facing away from the surface sieve (18).

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