Circulating pump, in particular heat pump, and water-conducting domestic appliance, in particular domestic dishwasher

Abstract

The invention relates to a circulating pump, in particular a heat pump, (26), for a water-conducting domestic appliance, in particular a domestic dishwasher (1), comprising a pump housing (41), an impeller (45) mounted within the pump housing (41) for conveying a treatment liquid, in particular a washing liquor and / or fresh water (F), from a fluid inlet (44) of the pump housing (41) to a plurality of fluid outlets (59, 60, 61, 62) of the pump housing (41), and a water diverter (27) integrated into the pump housing (41) for supplying the treatment liquid, in particular a washing liquor and / or fresh water (F), to fluid outlets (59, 60, 61, 62) selected using the water diverter (27), wherein the impeller (45) is mounted in the pump housing (41) so as to be rotatable about a central axis (40) of the pump housing (41), the water diverter (27) has a water diverter drive (77), and the water diverter drive (77) is designed to have a mechanical blocking effect in a reference position (P0) such that the reference position (P0) can be determined using the motor current of the water diverter drive (77).

Description

[0001] 202401693

[0002] 1 / 36

[0003] Circulating pump, in particular heating pump, and water-bearing household appliance, in particular household dishwasher

[0004] The present invention relates to a circulation pump, in particular a heating pump, for a water-bearing household appliance, in particular a household dishwasher, and to a water-bearing household appliance, in particular a household dishwasher, with such a circulation pump, in particular a heating pump.

[0005] For example, a household dishwasher has a wash tub in which the items to be cleaned are placed. To spray the items with the cleaning fluid, especially the wash solution or so-called rinse water, spray devices, for example in the form of rotating spray arms, can be provided in the wash tub. Depending on the specific phase of a dishwasher program, the wash solution or rinse water can preferably be fresh water and / or water containing detergent or rinse aid. The spray devices are part of a hydraulic circuit or circulation system of the household dishwasher, in which the wash solution is circulated by a pump.A heating device can also be integrated into the hydraulic circuit to heat the wash fluid to a required temperature during the respective wash phase of a given dishwashing program. For this purpose, the heating device has at least one heating element. Preferably, the heating device can be assigned to the circulation pump, and in particular integrated into it, thus forming a so-called heating pump. A pump sump is preferably arranged on the underside of the wash tank, to which the heating pump can be connected as part of the hydraulic or circulation circuit. The heating pump can then supply the wash fluid to the spray system, particularly via one or more supply lines.To distribute the rinsing solution and / or fresh water to the spray devices, a so-called water diverter can be used, which is connected downstream of the circulation pump, especially the heating pump. The water diverter allows several fluid outlets to be controlled, with each fluid outlet assigned to a spray device. For this purpose, the water diverter has a water diverter disc with several 202401693.

[0006] 2 / 36

[0007] Openings allow for the selective opening and closing of individual fluid outlets. A sensor, in the simplest form of a switch, is required for position detection of the water diverter disc; this sensor is actuated by a actuator or a cam disc.

[0008] Furthermore, washing machines or washer-dryers, for example, may also have circulation pumps in their hydraulic or circulation circuits to circulate dirty clothing with wash water. A heating element may be associated with the respective circulation pump; in particular, a heating element may be integrated into the respective circulation pump.

[0009] Against this background, one object of the present invention is to provide an improved circulation pump, in particular a heating pump, for a water-bearing household appliance, in particular a household dishwasher.

[0010] Accordingly, a circulation pump, in particular a heating pump, is proposed for a water-bearing household appliance, in particular for a household dishwasher.The circulating pump, in particular a heating pump, comprises a pump housing, an impeller arranged within the pump housing for pumping treatment fluid, in particular rinsing liquor and / or fresh water, from a fluid inlet of the pump housing to several fluid outlets of the pump housing, and a water diverter integrated into the pump housing for supplying selected fluid outlets with treatment fluid, in particular rinsing liquor and / or fresh water, wherein the impeller is rotatably mounted in the pump housing about a central axis of the pump housing, wherein the water diverter has a water diverter drive, and wherein the water diverter drive is configured to mechanically lock in a reference position, so that the reference position can be determined by means of a motor current of the water diverter drive.

[0011] Because the water diverter actuator is mechanically blocked in the reference position, allowing the reference position to be determined using the detected motor current of the water diverter actuator, additional sensors for determining the reference position are unnecessary. This enables a simple design of the circulation pump, 202401693

[0012] 3 / 36 especially heating pump, and cost-effective manufacturing of the circulation pump, especially heating pump, .

[0013] The circulation pump, in particular a heating pump, is a component of the hydraulic circuit of a water-bearing household appliance, especially a household dishwasher. In addition to the circulation pump, the hydraulic circuit may include several spray devices, for example, in the form of rotatably mounted spray arms, and / or other units that dispense treatment fluid. The circulation pump, in particular a heating pump, supplies the spray devices and / or other units that dispense treatment fluid with treatment fluid, in particular wash liquor and / or fresh water. Simultaneously, the circulation pump can introduce heat into the treatment fluid, in particular wash liquor and / or fresh water, by means of a heating element.Accordingly, a "heating pump" in this context is understood to be a pump that is suitable both for circulating treatment fluid, in particular rinsing solution and / or fresh water, in the hydraulic circuit, and for supplying heat to the circulated treatment fluid, in particular rinsing solution and / or fresh water. Circulation is achieved by means of the impeller. With the aid of the impeller, the treatment fluid, in particular rinsing solution and / or fresh water, is conveyed from the fluid inlet to the fluid outlets during operation of the circulating pump, in particular the heating pump. Heat is supplied by means of the heating element. The heating element is integrated into the circulating pump, thus forming a heating pump. The heating pump can also be referred to as a compact heating pump.

[0014] The pump housing is preferably multi-part. For example, the pump housing can have a lower housing section and an upper housing section connected to the lower housing section. The impeller is arranged inside the pump housing and, in particular, between the lower housing section and the upper housing section. In particular, the impeller is positioned downstream of the fluid inlet. The impeller can be driven, in particular, by means of a drive motor of the circulating pump, especially a heating pump. The drive motor is an electric motor, in particular a BLDC (brushless DC) motor or a permanent magnet synchronous motor (PMSM), which preferably operates as a wet rotor. The drive motor is integrated into the circulating pump, in particular a heating pump. In particular, the drive motor can be rigidly connected to the upper housing section.

[0015] 4 / 36 bound. The drive motor has a drive shaft which rotates around the central axis during operation. The drive shaft is coupled to the impeller.

[0016] The pump housing can be constructed, at least in sections, with rotational symmetry about its central axis. This means that parts of the pump housing can be rotationally symmetric about the central axis, while other parts of the pump housing cannot be rotationally symmetric about the central axis. The central axis can also be referred to as the axis of symmetry or the axis of rotation.

[0017] The circulation pump, in particular the heating pump, is advantageously arranged or installed in the household dishwasher such that its central axis runs at least approximately along or parallel to a direction of gravity. The central axis is thus preferably arranged at least approximately vertically. The circulation pump, in particular the heating pump, can therefore also be referred to as a vertical circulation pump, in particular a vertical heating pump.

[0018] Advantageously, the fluid inlet can be connected to a pump sump of the water-bearing household appliance, in particular a household dishwasher. This allows the circulation pump, in particular a heating pump, to draw treatment fluid, in particular wash liquor and / or fresh water, from the pump sump. The fluid inlet is provided, in particular, on the lower part of the housing. The fluid inlet can be rotationally symmetrical about the central axis. In other words, the fluid inlet can be located centrally on the pump housing. The fluid inlet can be at least partially tubular or hollow cylindrical. The fluid inlet extends along the central axis. This means, in particular, that the fluid inlet runs parallel to the central axis. The fluid inlet is provided, in particular, on the underside of the pump housing, whereas the fluid outlets are provided on the top side of the pump housing.

[0019] The pump housing can have any number of fluid outlets. In particular, each of the aforementioned spray devices can be assigned such a fluid outlet. For example, three or four fluid outlets are provided. The fluid outlets are arranged on the upper part of the housing. The fluid outlets are tubular or hollow cylindrical and preferably run parallel to the central axis. The fluid outlets are 202401693

[0020] 5 / 36 along a radial direction of the circulation pump, in particular a heating pump, viewed at a distance from the central axis. The fluid outlets can be arranged unevenly distributed around the central axis. The radial direction is oriented perpendicular to the central axis and points away from it.

[0021] The fluid outlets are, in particular, part of the water diverter integrated into the circulation pump, especially the heating pump. The water diverter engages a water diverter disc that is rotatably mounted in the pump housing. The water diverter disc is, in particular, annular, especially circular. The water diverter disc has perforations with multiple openings. These openings allow individual fluid outlets or multiple fluid outlets to be selectively opened or closed. Thus, it is possible to selectively supply individual spray devices and / or other treatment fluid dispensing units with treatment fluid, in particular rinsing solution and / or fresh water, while simultaneously deactivating other spray devices and / or treatment fluid dispensing units.All spray devices can also be supplied with treatment fluid, in particular rinsing solution and / or fresh water, simultaneously.

[0022] The water diverter disc is arranged within the pump housing. Specifically, the water diverter disc is positioned between the lower and upper housing sections. The water diverter disc may be floatingly mounted. The water diverter disc can be driven, in particular rotated about its central axis, by means of the water diverter drive. The water diverter drive may include a drive ring coupled to the water diverter disc and a worm shaft for driving the drive ring. The water diverter drive comprises a drive motor. The drive motor is preferably a BLDC motor or a permanent magnet synchronous motor that is electronically commutated. This drive motor of the water diverter drive may, in particular, be designed as a wet rotor motor.

[0023] The fact that the water diverter is "integrated" into the pump housing means, in this case, that the water diverter is not a separate assembly from the circulation pump, in particular the heating pump, but rather that the water diverter is arranged inside the pump housing and / or that the water diverter is at least partially separated from the 202401693

[0024] 6 / 36

[0025] The pump housing is formed. For example, the water diverter disc is arranged inside the pump housing, and the fluid outlets, which are part of the water diverter, are also part of the pump housing.

[0026] The fact that fluid outlets can be "selected" using the water diverter means, in this case, that certain fluid outlets can be opened and others closed by rotating the water diverter disc. This rotation of the water diverter disc can be performed, for example, depending on the current operating program of the water-using household appliance, particularly the current wash cycle of a household dishwasher. The water diverter can be initialized from the reference position. For this purpose, a reference run with reduced motor current can be performed, for example, to avoid excessive mechanical stress on the water diverter drive. The reference position can be assigned to the water diverter disc.

[0027] The motor current of the water diverter drive, particularly the drive motor, can be detected, for example, by a control unit of the water-bearing household appliance, especially a household dishwasher. If the control unit detects, for instance, a sudden increase in motor current, it can be expected that the reference position has been reached, as the water diverter drive is mechanically blocked. Therefore, as soon as the motor current increases abruptly, the water diverter drive, particularly the drive motor, can be switched off, and simultaneously the control unit receives the information that the reference position has been reached. In this context, "mechanical blockage" means that components of the water diverter drive are in such a way that further rotation of the water diverter disc in a specific direction is no longer possible.

[0028] According to one embodiment, the fluid inlet and fluid outlets extend along the central axis.

[0029] As mentioned previously, the fluid inlet is preferably at least partially tubular or hollow cylindrical. The fluid outlets are also preferably at least partially tubular or hollow cylindrical. The fluid inlet extends 202401693

[0030] 7 / 36, in particular, the fluid outlets extend from the underside of the pump housing, and the fluid outlets preferably extend from the top of the pump housing. The fluid inlet and the fluid outlets preferably run along or parallel to the central axis.

[0031] According to a further embodiment, the water diverter has a water diverter disc rotatably mounted in the pump housing for releasing or blocking selected fluid outlets, wherein the water diverter disc can be rotated from the reference position clockwise or counterclockwise to different positions by means of the water diverter drive.

[0032] The water diverter disc has the aforementioned openings for opening or closing selected fluid outlets. These openings can be, in particular, elongated. The water diverter disc can have several such openings, which can be of different sizes. For example, the water diverter disc has exactly three openings, with at least one opening being larger than the other two. The water diverter disc is preferably annular, and in particular circular. The positions that the water diverter disc can reach differ from one another in that different fluid outlets are opened or closed in the different positions. The different positions can be reached, for example, during a specific operating program of the water-using household appliance, in particular the washing program of a household dishwasher.

[0033] According to another embodiment, the pump housing has a lower housing part and an upper housing part connected to the lower housing part, with the water diverter disc being arranged between the lower housing part and the upper housing part.

[0034] The lower and upper housing parts are preferably made of plastic, in particular injection-molded plastic. The lower and upper housing parts can be latched or snapped together. A bayonet connection between the lower and upper housing parts can also be provided. During operation of the circulation pump, in particular a heating pump, the water diverter disc is preferably pressed against the upper housing part. This provides additional protection. 202401693

[0035] 8 / 36 The seal between the upper housing part and the water diverter disc is unnecessary. In particular, the water diverter disc is floatingly mounted between the lower housing part and the upper housing part.

[0036] According to a further embodiment, the water diverter drive has a drive ring coupled to the water diverter disc and a worm shaft, wherein the drive ring and the worm shaft interlock positively to drive the water diverter disc, and wherein the drive ring and the worm shaft mechanically lock in the reference position.

[0037] A positive-locking connection is created by the interlocking or overlapping of two connecting parts, in this case the drive ring and the worm shaft. The drive ring is ring-shaped and preferably has an annular toothed section with a multitude of external teeth. The drive ring is thus toothed. The worm shaft engages with these teeth of the drive ring with a helical or spiral worm gear to drive the drive ring. The drive ring is, in turn, positively connected to the water diverter disc. For example, the drive ring has coupling ribs that positively engage in corresponding receiving recesses of the water diverter disc. The worm shaft is driven by the drive motor of the water diverter drive.

[0038] According to another embodiment, the drive ring has a stop ridge extending between two adjacent teeth in order to mechanically block the worm shaft in the reference position using the stop ridge.

[0039] Preferably, the drive ring has exactly one stop ridge. The stop ridge preferably runs horizontally between two adjacent teeth. In the reference position, the stop ridge mechanically blocks the worm shaft. For this purpose, the worm shaft contacts the stop ridge or rests against it.

[0040] According to a further embodiment, the worm shaft has worm teeth, wherein a first end geometry and a second end geometry are integrally formed at the end of the worm teeth, and wherein in the reference position either the first end geometry or the second end geometry abuts the stop rib. 202401693

[0041] 9 / 36

[0042] The first and second end geometries are preferably surfaces provided at the ends of the worm gear. In the reference position, either the first end geometry rests against a first stop surface of the stop rib, or the second end geometry rests against a second stop surface of the stop rib. Contact between both end geometries and both stop surfaces is therefore not intended. The first and second stop surfaces are positioned facing away from each other on the stop rib.

[0043] According to another embodiment, the first end geometry and the second end geometry are designed to clear spaces between the teeth of the drive ring during operation of the water diverter drive.

[0044] This allows, for example, dirt particles to be removed from the gaps. This prevents unwanted blockage of the water diverter drive by dirt particles. It also reliably prevents the gaps from becoming increasingly clogged with dirt particles, which could lead to the water diverter drive becoming stiffer.

[0045] According to a further embodiment, the drive ring and the screw shaft are arranged in the pump housing in such a way that the drive ring and the screw shaft are immersed at least partially in the treatment fluid, in particular rinsing liquor and / or fresh water, during operation of the circulation pump, in particular heating pump.

[0046] In other words, sealing of the water diverter drive is unnecessary. This allows for a simpler design of the circulation pump, especially a heating pump, and reduces manufacturing costs. The drive ring is specifically mounted in a groove provided on the lower housing, which is filled with treatment fluid, especially rinsing solution and / or fresh water.

[0047] Furthermore, a household dishwasher with such a circulation pump, in particular a heating pump, is proposed. 202401693

[0048] 10 / 36

[0049] The household dishwasher preferably has a cuboid-shaped wash tub. The wash tub can be closed by means of a hinged door. The wash tub can contain several compartments, for example, a lower rack, an upper rack, and a cutlery drawer. These compartments hold items that can be supplied with wash water and / or fresh water via the aforementioned hydraulic circuit. The circulation pump, in particular the heating pump, is part of this hydraulic circuit. The wash tub also contains several spray devices, for example, in the form of rotating spray arms, and / or one or more other units that dispense treatment fluid. These spray devices and / or units that dispense treatment fluid are also part of the hydraulic circuit.The circulation pump, in particular the heating pump, supplies the spray devices and / or other treatment fluid dispensing units with rinsing solution and / or fresh water to wet the items being cleaned. Selective or targeted control of individual or all spray devices and / or treatment fluid dispensing units is achieved using the water diverter integrated into the circulation pump, in particular the heating pump. A spray device in the form of an intensive spray zone may also be provided.

[0050] The circulation pump described above, in particular the heating pump, can also be implemented in other water-bearing household appliances. For example, it can also be found in a washing machine or a washer-dryer.

[0051] Further possible implementations of the circulation pump, in particular the heating pump, and / or the water-bearing household appliance, in particular the household dishwasher, also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments that are not explicitly mentioned. In doing so, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the circulation pump, in particular the heating pump, and / or the water-bearing household appliance, in particular the household dishwasher. 202401693

[0052] 11 / 36

[0053] Further advantageous embodiments and aspects of the circulation pump, in particular the heating pump, and / or the water-bearing household appliance, in particular the household dishwasher, are the subject of the dependent claims and the exemplary embodiments of the circulation pump, in particular the heating pump, and / or the household dishwasher described below.

[0054] The invention and its advantageous embodiments and further developments, as well as their advantages, are explained in more detail below with reference to advantageous embodiments and the accompanying figures.

[0055] They show, each in a schematic diagram:

[0056] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher;

[0057] Fig. 2 shows a schematic sectional view of the household dishwasher according to Fig. 1;

[0058] Fig. 3 shows a schematic sectional view of an embodiment of a heating pump for the household dishwasher according to Fig. 1;

[0059] Fig. 4 shows a schematic top view of the heating pump according to Fig. 3;

[0060] Fig. 5 shows a schematic bottom view of an embodiment of a water diverter for the heating pump according to Fig. 3;

[0061] Fig. 6 shows a schematic perspective view of an embodiment of a drive ring for the water diverter according to Fig. 5;

[0062] Fig. 7 shows a schematic perspective view of an embodiment of a worm shaft for the water diverter according to Fig. 5;

[0063] Fig. 8 shows view VIII according to Fig. 5; and 202401693

[0064] 12 / 36

[0065] Fig. 9 shows a schematic view of possible approachable positions of the water diverter according to Fig. 5.

[0066] In the figures, identical or functionally equivalent elements have been given the same reference symbols, unless otherwise indicated.

[0067] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a wash tub 2, which can be closed by a door 3, in particular in a watertight manner. For this purpose, a sealing device can be provided between the door 3 and the wash tub 2. The wash tub 2 is preferably cuboid in shape. The wash tub 2 can be arranged in a housing of the household dishwasher 1. The wash tub 2 and the door 3 can form a wash chamber 4 for washing dishes.

[0068] The door 3 is shown in its open position in Fig. 1. The door 3 can be opened or closed by pivoting it about a pivot axis 5 located at one of its lower ends. The door 3 can be used to open or close a loading opening 6 of the wash tank 2. The wash tank 2 has a base 7, a top 8 opposite the base 7, a rear wall 9 opposite the closed door 3, and two opposing side walls 10 and 11. The base 7, the top 8, the rear wall 9, and the side walls 10 and 11 can, for example, be made of stainless steel. Alternatively, the base 7 can, for example, be made of a plastic material.

[0069] The household dishwasher 1 further comprises at least one dishware holder 12, 13, 14. Preferably, several, for example three, dishware holders 12, 13, 14 can be provided, wherein the dishware holder 12 can be a lower dishware holder or a lower basket, the dishware holder 13 an upper dishware holder or an upper basket, and the dishware holder 14 a cutlery drawer. As further shown in Fig. 1, the dishware holders 12, 13, 14 are arranged one above the other in the wash tub 2. Each dishware holder 12, 13, 14 can be selectively moved into or out of the wash tub 2. In particular, each dishware holder 12, 13, 14 can be pushed or moved into the wash tub 2 in an insertion direction E and 202401693

[0070] 13 / 36 can be pulled out or extended from the washing container 2 in a pull-out direction A in the opposite direction of insertion E.

[0071] Figure 2 shows a highly schematic sectional view of the household dishwasher 1. Besides the wash tub 2, the household dishwasher 1 includes a base support 15, which supports the wash 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. In the orientation of Figure 2, the direction of gravity g is oriented from top to bottom. The household dishwasher 1 is associated with a coordinate system with a horizontal direction (x-direction x), a vertical direction (y-direction y), and a horizontal direction (z-direction z). The directions x, y, and z are oriented perpendicular to each other.

[0072] A pump sump 16 is provided at the base 7. The pump sump 16 is pot-shaped and extends downwards 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. The pump sump 16 is covered by a sieve system 17. The sieve system 17 comprises a surface filter or a surface sieve 18 that covers the pump sump 16.

[0073] Furthermore, the screening system 17 comprises a fine filter or fine screen 19, which is arranged at least partially within the pump sump 16. The fine screen 19 can be plate-shaped and separates the pump sump 16 into a raw area 20 and a clean area 21. Rinsing liquor and / or fresh water F can enter the raw area 20 and / or the clean area 21 through the flat screen 18. Furthermore, rinsing liquor and / or fresh water F can flow through the fine screen 19 from the raw area 20 to 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 recirculation area.

[0074] A drain 22 opens from the pump sump 16, specifically from the pipe section 20. A drain pump 23 is connected to the drain 22. The drain pump 23 can be used to remove contaminated rinse water and / or fresh water. F 202401693

[0075] The wastewater from 14 / 36 can be pumped out via a wastewater pipe 24. The wastewater pipe 24 can be connected to a stationary drain of a building.

[0076] Furthermore, a drain 25 opens from the pump sump 16, specifically from the clean area 21. The drain 25 can open from the bottom or side of the pump sump 16. A heating pump 26 is connected to the drain 25. The heating pump 26 circulates the wash liquor and / or fresh water F in the wash chamber 4. The heating pump 26 is designed to circulate the wash liquor and / or fresh water F. It is also designed to introduce heat into the wash liquor and / or fresh water F. The heating pump 26 can be attached to the pump sump 16. The heating pump 26 is a compact heating pump and can therefore also be referred to as such.

[0077] In the orientation shown in Fig. 2, the heating pump 26 is arranged at the level of the pump sump 16 with respect to the direction of gravity g, so that flushing fluid and / or fresh water F can also drain from the heating pump 26 back into the pump sump 16 when the heating pump 26 is switched off. However, the heating pump 26 can also be arranged below the pump sump 16 or at least partially above the pump sump 16.

[0078] The heating pump 26 is connected to a water diverter 27. The water diverter 27 is integrated into the heating pump 26. The water diverter 27 is therefore part of the heating pump 26. With the aid of the water diverter 27, it is possible to selectively distribute the rinsing solution and / or the fresh water F supplied by the heating pump 26 to different spray devices 28, 29, 30 provided in the rinsing tank 2. With the aid of the water diverter 27, the spray devices 28, 29, 30 can be selectively supplied with rinsing solution and / or fresh water F or not.

[0079] The spray devices 28, 29 can be rotatable spray arms, whereas the spray device 30 can preferably be a roof-mounted rotary sprayer or a roof-mounted shower head. Additionally, switchable intensive spray zones or one or more screen cleaning nozzles (not shown) can be provided. For example, the spray device 28, in particular a rotatable lower spray arm, is rotatable about a pivot axis 31 below the dishwashing container 12 on the base 7, on the pump sump 16, on the screen system. 202401693

[0080] 15 / 36 tern 17 or mounted on the heating pump 26. The spray device 28 has spray nozzles which spray the rinsing solution and / or the fresh water F upwards into the wash goods intake 12 and downwards towards the sieve system 17 in the orientation of Fig. 2.

[0081] The spray device 29, in particular a rotatable upper spray arm, can be rotatably mounted on the dishware holder 13 about a pivot axis 32. The spray device 29 also has spray nozzles which are configured to spray the wash water and / or the fresh water F downwards and / or upwards in the orientation shown in Fig. 2. The spray device 30 can be rotatably mounted on the ceiling 8 about a pivot axis 33. The spray device 30 applies wash water and / or fresh water F to the dishware holder 14 from above in the orientation shown in Fig. 2.

[0082] The spray device 28 is connected to the heating pump 26, and in particular to the water diverter 27, via a supply line 34. The heating pump 26 can supply the spray device 28 with rinsing solution and / or fresh water F via the supply line 34.

[0083] A supply line 35 is assigned to the spray device 29, which fluidically connects the spray device 29 to the heating pump 26. The heating pump 26 can supply the spray device 29 with rinsing solution and / or fresh water F via the supply line 35.

[0084] A supply line 36 is assigned to the spray device 30, which fluidically connects the spray device 30 to the heating pump 26. The heating pump 26 can supply the spray device 30 with rinsing solution and / or fresh water F via the supply line 36.

[0085] Each spray device 28, 29, 30 can have its own supply line 34, 35, 36. Alternatively, some or all of the spray devices 28, 29, 30 can share a common supply line that branches out. In particular, the supply lines 34, 35, 36 are formed by a common component, especially a common injection-molded plastic component. The supply lines 34, 35, 36 are routed along the rear wall 9 from the floor 7 towards the ceiling 8. The supply lines 34, 35, 36, or at least a portion of them, can pass through the sieve system 17. 202401693

[0086] 16 / 36

[0087] The heating pump 26 preferably has a separate connection or fluid outlet for each supply line 34, 35, 36. The heating 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 heating pump 26 circulates the wash liquor and / or the fresh water F in this hydraulic circuit 37. The heating pump 26 can be part of the hydraulic circuit 37, but this is not mandatory.

[0088] The household dishwasher 1 also includes a control unit 38. Different wash programs of the household dishwasher 1 can be carried out using the control unit 38. For this purpose, the following can be configured in the control unit:

[0089] 38 wash programs may be stored or saved. The control unit 38 is preferably located outside the wash tank 2.

[0090] The control unit 38 can be located, for example, in or on the door 3 or in a base support below the wash tank s2. The control unit 38 can also be housed in the base support 15. The control unit 38 can be operated or controlled using operating elements not shown. These operating elements can include, for example, buttons, knobs, and / or touchscreens. These can be located on the door 3.

[0091] The heating pump 26 can be controlled using the control unit 38. For example, the heating pump 26 can be switched on and off and / or its speed changed using the control unit 38. The control unit 38 can receive and evaluate information from the heating pump 26, such as its speed and / or motor current. Furthermore, the control unit 38 can also control the water diverter 27 to selectively switch the spray devices 28, 29, 30 on or off.

[0092] The items to be cleaned 39 are arranged in the washing container 2. These items 39 can include, for example, glasses, plates, pots, bowls, cutlery, or the like. In particular, the items 39 are held in the item holders 12, 13, 14 (not shown in Fig. 2). The items can be washed by means of the spray devices 28, 29, 30.

[0093] 39 with rinsing solution and / or fresh water F. 202401693

[0094] 17 / 36

[0095] Figure 3 shows a schematic sectional view of an advantageous embodiment of a heating pump 26 as previously mentioned. Figure 4 shows a top view of the heating pump 26. Reference is made hereafter to Figures 3 and 4 simultaneously.

[0096] The heating pump 26 has an axial direction AX, which, in the orientation shown in Fig. 3, extends from bottom to top (opposite the direction of gravity g). The axial direction AX can coincide with the y-direction y. In particular, the axial direction AX coincides with or is oriented parallel to a symmetry or central axis 40 of the heating pump 26. Furthermore, the heating pump 26 has a radial direction R. The radial direction R is perpendicular to and oriented away from the central axis 40. The axial direction AX and the radial direction R are thus perpendicular to each other. The heating pump 26 is therefore vertically oriented. The central axis 40 runs along the direction of gravity g or is oriented parallel to it.

[0097] The heating pump 26 has a heating pump housing 41 with a one-piece lower housing part 42 and a one-piece upper housing part 43. The lower housing part 42 and the upper housing part 43 can be plastic components, in particular injection-molded plastic components. The lower housing part 42 and the upper housing part 43 can be rusted or snapped together. However, a bayonet connection and / or a screw connection can also be provided.

[0098] The lower housing part 42 has a fluid inlet 44 to which the outlet 25 is connected. For example, the outlet 25 is pushed onto the fluid inlet 44 and sealed against it by means of a sealing element, for example in the form of an O-ring. The heating pump housing 41 is essentially rotationally symmetrical about the central axis 40.

[0099] The lower housing part 42 and the upper housing part 43 are positively connected to each other (not shown). For this purpose, locking hooks, snap hooks, or the like may be provided, enabling a positive connection between the lower housing part 42 and the upper housing part 43. A positive connection is created by the interlocking or overlapping of two connecting parts, in this case the lower housing part 42 and the upper housing part 43. 202401693

[0100] 18 / 36

[0101] The lower part of the housing 42 accommodates an impeller 45, which is located downstream of the fluid inlet.

[0102] The impeller 45 is arranged in Fig. 44. The impeller 45 is not shown in section in Fig. 3. The impeller 45 can be a vane or be described as such. The impeller 45 is driven by a drive motor 46. The drive motor 46 is an electric motor. The impeller 45 can also be described as an impeller. The drive motor 46 comprises a drive shaft 47 that is non-rotatably connected to the impeller 45 and rotates about the central axis 40 when the heating pump 26 is in operation. In addition to the impeller 45, a rotor 48 of the drive motor 46 is non-rotatably connected to the drive shaft 47.

[0103] The rotor 48 is rotatably mounted about the central axis 40 in a cup-shaped first receiving section 49 of the upper housing part 43. The first receiving section 49 encloses a receiving chamber 50 in which the rotor 48 is received. The receiving chamber 50 can be filled with rinsing solution and / or fresh water F. In the orientation shown in Fig. 3, the first receiving section 49 is oriented downwards, i.e., towards the impeller.

[0104] 45 is closed with a closure 51. The drive shaft 47 passes through the closure 51 and can be supported by it.

[0105] The drive motor 46 is preferably a BLDC (brushless DC) motor or a permanent magnet synchronous motor (PMSM), in particular a wet rotor motor, with a vertical orientation. The drive motor 46, with the drive shaft 47 oriented vertically, is integrated and / or embedded in the upper housing part 43. The drive motor 46 drives the impeller 45, which draws in the cleaning solution and / or the fresh water F from below, deflects it by 90°, and accelerates it outwards in the radial direction R.

[0106] In addition to the first receiving section 49, the upper part of the housing 43 includes a second receiving section 52. The second receiving section 52 is also cup-shaped. In contrast to the first receiving section 49, the second receiving section 52, in the orientation shown in Fig. 3, is open at the top rather than the bottom. The first receiving section 49 is located inside the second receiving section 52. The second receiving section 52 therefore has a larger diameter than the first receiving section 49.

[0107] An annular recording chamber 53 is provided between the first recording section 49 and the second recording section 52. A stator 202401693 is located in the recording chamber 53.

[0108] 19 / 36

[0109] The stator 54 is arranged on the drive motor 46. The stator 54 can be bonded to the first receiving section 49 and / or the second receiving section 52.

[0110] The lower housing section 42 has a plate-shaped base section 55 and a tubular or hollow cylindrical wall section 56. The fluid inlet 44 is provided on the base section 55. Both the base section 55 and the wall section 56 are rotationally symmetrical about the central axis 40. The base section 55 and the wall section 56 transition into each other by means of a circumferential radius 57 around the central axis 40. A connecting section 58, which also circumferentially 40, adjoins the wall section 56. The upper housing section 43 is connected to the lower housing section 42 at the connecting section 58.

[0111] The upper housing part 43 has several fluid outlets 59, 60, 61, 62. Supply lines 34, 35, 36 are connected to the fluid outlets 59, 60, 61, 62. If three spray devices 28, 29, 30 are provided, preferably exactly three fluid outlets 59, 60, 61, 62 are also provided. If, for example, four spray devices 28, 29, 30 are provided, four fluid outlets 59, 60, 61, 62 are accordingly provided. The fluid outlets 59, 60, 61, 62 are arranged unevenly around the central axis 40. The fluid outlets 59, 60, 61, 62 are oriented vertically upwards and thus along the central axis 40.

[0112] Fluid outlets 59, 60, 61, and 62 are part of the water diverter 27. Therefore, the upper housing section 43 can be at least partially part of the water diverter 27. In this case, fluid outlet 59 is assigned to the spray device 28. Fluid outlet 60 is an auxiliary outlet, which could, for example, be assigned to an intensive spray zone (not shown). Fluid outlet 61 is assigned to the spray device 30, and fluid outlet 62 is assigned to the spray device 29. However, the assignment can also be different.

[0113] The fluid outlets 59, 60, 61, 62 are tubular and extend along the central axis 40 or along the axial direction AX. The fluid outlets 59, 60, 61, 62 can each have a circular, elliptical, or oval cross-section. During operation of the heating pump 26, flushing fluid and / or fresh water F can be discharged via the fluid outlets 59, 60, 61, 62. 202401693

[0114] 20 / 36

[0115] The fluid outlets 59, 60, 61, 62 extend from a closing plate 63 of the upper housing part 43, which closes off the end face of the upper housing part 43. A tubular or hollow cylindrical connecting section 64 runs around the closing plate 63, by means of which the upper housing part 43 is connected to the connecting section 58 of the lower housing part 42.

[0116] The upper housing part 43 further comprises a tubular or hollow cylindrical wall section 65, which is arranged within the wall section 56 of the lower housing part 42. The wall section 65 is, in particular, part of the second receiving section 52. The wall section 65 is rotationally symmetrical about the central axis 40. An annular gap or supply chamber 66 is formed between the two wall sections 56 and 65, which is filled with cleaning solution and / or fresh water F during operation of the heating pump 26. During operation of the heating pump 26, the cleaning solution and / or fresh water F flows around the central axis 40 through the supply chamber 66.

[0117] The heating pump 26 further comprises a heating element 67 for introducing heat Q into the flushing solution and / or the fresh water F. The heating element 67 is an electric heating element. The heating element 67 can be a tubular heating element or be described as such. The heating element 67 is annular and rotates at least partially around the central axis 40. The heating element 67 can be rotationally symmetrical about the central axis 40, at least partially. The heating element 67 is located below the supply chamber 66 and is surrounded by flushing solution and / or fresh water F during operation of the heating pump 26. Viewed along the axial direction AX, the heating element 67 is located at least partially at the level of the impeller 45.

[0118] The heating device 67 is associated with a plane of symmetry 68, with which the heating device 67 is symmetrically constructed. The plane of symmetry 68 intersects the central axis 40 and is arranged perpendicular to it. The plane of symmetry 68 also intersects the impeller 45. Furthermore, the plane of symmetry 68 can also intersect the drive shaft 47.

[0119] The heating device 67 has a metallic outer casing filled with a compressed magnesium oxide filling. A heating element, for example in the form of a heating wire, is embedded in the magnesium oxide filling. The heating element can be spirally shaped. 202401693

[0120] The heating element 67 may be coiled 21 / 36. The outer casing may be made of stainless steel. Preferably, the heating element 67 may not have a circular cross-section, but at least partially, particularly where it is exposed to cleaning liquor and / or fresh water, elliptical or oval. In this case as well, the heating element 67 is symmetrical about the plane of symmetry 68.

[0121] The heating element 67 is placed on spacer feet 69, 70, of which only two are shown in Fig. 3. These are preferably provided on the lower housing part 42, in particular on its bottom section 55. Any number of spacer feet 69, 70 can be provided, which can be arranged evenly distributed around the central axis 40. The spacer feet 69, 70 can be made, for example, of metal, plastic, or ceramic. If the spacer feet 69, 70 are made of metal or ceramic, they can be received in pockets that are integrally formed on the lower housing part 42. The spacer feet 69, 70 can also be overmolded with a material from which the lower housing part 42 is made. The spacer feet 69, 70 prevent the heating element 67 from resting directly on the bottom section 55, so that a complete flow of cleaning solution and / or fresh water F around the heating element 67 is possible.

[0122] The fluid inlet 44 forms, in particular, the lowest point of the heating pump 26. This allows the flushing solution and / or the fresh water F to drain completely from the heating pump 26 by gravity when the heating pump 26 is not in operation. This drainage of the flushing solution and / or the fresh water F is indicated in Fig. 3 by an arrow 71. The flushing solution and / or the fresh water F can thus flow back into the pump sump 16 by gravity. The heating pump 26 can therefore empty itself.

[0123] A water diverter disc 72, rotatable about the central axis 40, is arranged between the upper housing part 43, in particular the end plate 63, and the lower housing part 42. The water diverter disc 72 is part of the water diverter 27, which is shown in a bottom view in Fig. 5, i.e., looking from the fluid inlet 44 towards the fluid outlets 59, 60, 61, 62. The feed chamber 66 supplies the rinsing solution and / or the fresh water F to the water diverter disc 72. 202401693

[0124] 22 / 36

[0125] The water diverter disk 72 is rotationally symmetrical about the central axis 40. The water diverter disk 72 has a central opening 73. The second receiving section 52 with the wall section 65 passes through the opening 73. The opening 73 is preferably circular. The water diverter disk 72 is annular.

[0126] Furthermore, the water diverter disk 72 has several openings 74, 75, 76 in its otherwise closed annular, in particular circular, disk surface. With the aid of the openings 74, 75, 76, the fluid outlets 59, 60, 61, 62 can be selectively blocked or opened for flushing fluid and / or fresh water by rotating the water diverter disk 72 about the central axis 40. In Fig. 3, for example, the fluid outlet 59 is opened and the fluid outlet 62 is blocked, so that flushing fluid and / or fresh water F can only flow out through the fluid outlet 59.

[0127] The openings 74, 75, 76 can be circular. The openings 74, 75, 76 can also be elongated. Using the elongated geometry, it is possible to open several of the fluid outlets 59, 60, 61, 62 simultaneously. The number of openings 74, 75, 76 can correspond to the number of fluid outlets 59, 60, 61, 62. However, this is not mandatory. Using the water diverter disc 72, the fluid outlets 59, 60, 61, 62 can be combined in any way.

[0128] A water diverter drive 77, for example comprising a drive motor 78, is provided for rotating the water diverter disc 72 about the central axis 40. The water diverter 27 thus has the previously described water diverter disc 72 and the water diverter drive 77. The water diverter drive 77 has a drive ring 79 coupled to the water diverter disc 72 and a worm shaft 80 for driving the drive ring 79. The axis of rotation of the drive ring 79 is preferably arranged along the central axis 40, i.e., the drive ring 79 can be driven to rotate about the central axis 40. The drive motor 78 is preferably a BLDC (brushless DC) motor or a permanent magnet synchronous motor that is electronically commutated. The drive motor 78 is housed in a drive housing 81. The drive motor 78 is located laterally and tangentially on the heating pump housing 41, in particular on the lower housing part 42. 202401693

[0129] 23 / 36

[0130] The feed chamber 66 extends to the water diverter disc 72. The feed chamber 66 is rotationally symmetrical about the central axis 40. In this exemplary embodiment, the feed chamber 66 widens in front of the water diverter disc 72 and distributes the rinsing solution and / or the fresh water F onto the water diverter disc 72. Alternatively, the feed chamber 66 can also be bounded along its longitudinal extent from bottom to top by parallel wall sections 65, 56 of the upper housing part 43 and the lower housing part 42, meaning that its cross-sectional width (perpendicular to the central axis 40) is then at least approximately the same at every point along its height. The water diverter 27 and / or the water diverter disc 72 is integrated into the feed chamber 66. The fluid outlets 59, 60, 61, 62 open out of the feed chamber 66.

[0131] In the annular supply chamber 66, during operation of the heating pump 26, the cleaning solution and / or the fresh water F flows in a circular or spiral direction S (Fig. 4) around the central axis 40 and through those fluid outlets 59, 60, 61, 62 that are opened by means of the water diverter 27, upwards along the axial direction AX to the corresponding supply lines 34, 35, 36 in order to supply the spray devices 28, 29, 30 with cleaning solution and / or fresh water F. The flow direction S can be oriented counterclockwise or clockwise.

[0132] The water diverter disc 72 is floatingly mounted in the aforementioned drive ring 79, so that the water diverter disc 72 can be driven via the drive ring 79. Furthermore, the water diverter disc 72 floats towards the housing upper part 43 due to the flow and pressure of the flushing solution and / or the fresh water F, thus sealing the openings integrated in the housing upper part 43 for the fluid outlets 59, 60, 61, 62 as tightly as possible without requiring an additional elastomer seal.

[0133] Fig. 6 shows a schematic perspective view of an embodiment of a drive ring 79 as previously mentioned. The drive ring 79 has an annular toothed section 82 with a plurality of outwardly projecting teeth 83, 84, of which only two are provided with a reference numeral in Fig. 6. A stop rib 85 extends perpendicular to the teeth 83, 84 and thus horizontally between two adjacent teeth 83, 84 (viewed in the circumferential direction). The stop rib 85 connects 202401693

[0134] 24 / 36 the two teeth 83, 84 mesh with each other. The drive ring 79 is mounted on the lower housing part 42 by the toothed section 82.

[0135] Furthermore, the drive ring 79 comprises an annular coupling section 86, which extends inwards from the toothed section 82 in the opposite direction to the radial direction R. The coupling section 86 is divided into several coupling subsections 87, 88, 89, between which coupling webs 90, 91, 92 are positioned for coupling the drive ring 79 to the water diverter disc 72. The coupling webs 90, 91, 92 are preferably positively engaged in receiving pockets 93, 94, 95 (Fig. 5) of the water diverter disc 72 that correspond to the coupling webs 90, 91, 92. This enables torque transmission from the drive ring 79 to the water diverter disc 72.

[0136] Fig. 7 shows a schematic perspective view of an embodiment of a worm shaft 80 as previously mentioned. The worm shaft 80 is driven by the drive motor 78 to rotate the drive ring 79 about the central axis 40. For this purpose, a drive shaft of the drive motor 78 is non-rotatably connected to the worm shaft 80.

[0137] The worm shaft 80 comprises a shaft section 96. The shaft section 96 is coupled to the drive motor 78. A spiral or helical worm gear 97 is attached to the outside of the shaft section 96, which is arranged to engage with the toothed section 82 of the drive ring 79.

[0138] The worm gear 97 has a first end geometry 98 and a second end geometry 99. Both end geometries 98 and 99 are designed to abut or bear against the stop rib 85. The first end geometry 98 is a surface formed at the end of the worm gear 97. Similarly, the second end geometry 99 is also a surface formed at the end of the worm gear 97.

[0139] Fig. 8 shows view VIII according to Fig. 5. The drive ring 79 is connected with its toothed section 82 to a shoulder 100 integrally formed on the lower housing part 42. 202401693

[0140] 25 / 36 bearings. The shoulder 100 runs in a ring shape around the central axis 40. The drive ring

[0141] 79 is completely immersed in the cleaning solution and / or fresh water F during operation of the heating pump 26. The water diverter disc 72 is also completely covered by the cleaning solution and / or fresh water F.

[0142] The stop 85 has a first stop surface 101 for the first end geometry 98 and a second stop surface 102 for the second end geometry 99. The stop surfaces 101 and 102 are positioned facing away from each other on the stop 85. In the orientation shown in Fig. 8, the first stop surface 101 points downwards, whereas the second stop surface 102 points upwards.

[0143] In Fig. 8, the worm shaft 80 rests with its first end geometry 98 against the first stop surface 101. By rotating the worm shaft 80, the second end geometry 99 can be brought into contact with the second stop surface 102. Thus, either the first end geometry 98 rests against the first stop surface 101, or the second end geometry 99 rests against the second stop surface 102.

[0144] With the aid of the stop lug 85 provided on the drive ring 79 and the end geometries 98, 99 of the worm shaft 80, it is possible to implement a mechanical end stop in the water diverter drive 77 such that the water diverter 27 cannot bind. Depending on the direction of rotation of the driving worm shaft 80, one of the end geometries 98, 99 is blocked against the stop lug 85. This blockage can be detected, for example, by the control unit 38 during a reference run via a motor current from the drive motor 78, which informs the control electronics, which can be part of the control unit 38, that the water diverter 27 has reached a reference position. Once the reference position is detected, the water diverter 27 can be initialized. In the reference position, for example, the spray device 28 can be supplied with rinsing solution and / or fresh water F.

[0145] Since the water diverter drive 77 is located directly next to the water diverter disc 72, it is not possible to isolate the drive ring 79 and the worm shaft 80 from the rinsing solution and / or fresh water F. Therefore, the drive ring 79 and the worm shaft run continuously.

[0146] 80 is exposed to wastewater at least temporarily. This can lead to dirt particles entering the area of ​​the drive ring 79 and the worm shaft 80. (Reference 202401693)

[0147] 26 / 36 In order to prevent clogging of the teeth 83, 84, the worm gear 97 is shaped in such a way that the end geometries 98, 99, which are used for an end stop on the stop bar 85 as previously explained, simultaneously function as clearing teeth for dirt particles.

[0148] Furthermore, the aforementioned reference run, which serves to determine the zero position, can be performed with a special control system to avoid placing excessive mechanical stress on the water diverter 27. Ideally, the heating pump 26, and in particular the drive motor 46, is switched off to reduce frictional torque between the water diverter disc 72 and the upper housing part 43. During the reference run, the water diverter drive 77 operates at a reduced speed and with reduced motor current until one of the end geometries 98, 99 contacts the corresponding stop surface 101, 102.

[0149] Advantageously, this allows for position detection of the water diverter disc 27 without additional sensors. The worm shaft 80 and the drive ring 79 do not bind. The end geometries 98, 99 on the worm gear 97 simultaneously serve to clean the spaces between the teeth 83, 84 of the gear section 82. A reference run with reduced motor current is possible to avoid excessive mechanical stress on the water diverter 27.

[0150] Fig. 9 shows a schematic view of possible approachable positions of the water diverter 27, in particular the water diverter disc 72. PO denotes a reference position as previously mentioned. In the reference position PO, one of the end geometries 98, 99 rests against its corresponding stop surface 101, 102. From the reference position PO, the water diverter disc 72 can be rotated clockwise or counterclockwise. In the reference position PO, all fluid outlets 59, 60, 61, 62 are closed.

[0151] For example, the water diverter disc 72 can be rotated from the reference position PO to position P1. In position P1, for example, a lower basket spray arm in the form of the spray device 28 and an additional feature or function, for example in the form of an intensive spray zone, are supplied with rinse water and / or fresh water F. In other words, the fluid outlets 59, 60 are supplied with rinse water and / or fresh water F. 202401693

[0152] 27 / 36

[0153] In position P2, for example, a roof sprayer or roof shower in the form of spray device 30 and the previously mentioned additional function are supplied with rinsing solution and / or fresh water F. In other words, in position P2 only the fluid outlets 60 and 61 are supplied with rinsing solution and / or fresh water F. In position P3, an upper basket spray arm in the form of spray device 29 and a roof sprayer or roof shower in the form of spray device 30 are activated. Thus, in position P3, the fluid outlets 61 and 62 are supplied with rinsing solution and / or fresh water F.

[0154] In position P4, only the spray devices 28 and 29, and thus the fluid outlets 59 and 62, are supplied with cleaning solution and / or fresh water F. In position P5, only the fluid outlet 60 is supplied with cleaning solution and / or fresh water F, thus activating the additional function. In position P6, only the spray device 30, in particular a roof-mounted sprayer or a roof shower, is active. This means that in position P6, only the fluid outlet 61 is open. In position P7, only the spray device 29, in particular an upper basket spray arm, is supplied with cleaning solution and / or fresh water F. Thus, in position P7, only the fluid outlet 62 is open.

[0155] In position P8, only the spray device 28, specifically a lower basket spray arm, is active, and thus the fluid outlet 59 is open. In position P9, both the spray device 28 and the auxiliary function are supplied with rinsing solution and / or fresh water F. Therefore, in position P9, only the fluid outlets 59 and 60 are supplied with rinsing solution and / or fresh water F. In position P10, however, rinsing solution and / or fresh water F is supplied to the spray devices 28 and 30. This means that the fluid outlets 60 and 61 are open in position P10. From the reference position PO, the water diverter disc 72 can be rotated to either position P1 or position P10, depending on which of the end geometries 98 and 99 of the driving screw shaft 80 was previously blocked against the stop 85.

[0156] Although the present invention has been described using exemplary embodiments, it can be modified in many ways. 202401693

[0157] 28 / 36 In particular, the heating device in the heating pump described above may also be omitted, so that a circulation pump with integrated water diverter without heating function is provided.

[0158] In particular, the above explanations regarding the heating pump of the household dishwasher can also be applied to the circulation pumps, especially heating pumps, of other water-bearing household appliances such as washing machines, washer-dryers, or tumble dryers.

[0159] 202401693

[0160] 29 / 36

[0161] Reference symbols used:

[0162] 1 household dishwasher

[0163] 2 washing containers

[0164] 3 Door

[0165] 4. Dishwashing area

[0166] 5 swivel axes

[0167] 6 Feed opening

[0168] 7 Floor

[0169] 8 ceiling

[0170] 9 Back panel

[0171] 10 side wall

[0172] 11 Side wall

[0173] 12 Dishwashing tray

[0174] 13 Dishwashing tray

[0175] 14 Dishwashing tray

[0176] 15 base carriers

[0177] 16 Pump sump

[0178] 17 Sieve system

[0179] 18 surface sieve

[0180] 19 fine sieve

[0181] 20 Raw area

[0182] 21 Cleanroom

[0183] 22 Procedure

[0184] 23 Drain pump

[0185] 24 Wastewater pipe

[0186] 25 Procedure

[0187] 26 Heating pump

[0188] 27 Water diverter

[0189] 28 Spray device

[0190] 29 Spray device

[0191] 30 Spray device

[0192] 31 Rotation axis

[0193] 32 Rotary axis 202401693

[0194] 30 / 36

[0195] 33 Rotation axis

[0196] 34 Supply line

[0197] 35 Supply line

[0198] 36 Supply line

[0199] 37 Hydraulic circuit

[0200] 38 Control unit

[0201] 39 items washed

[0202] 40 Center axis

[0203] 41 Heating pump housings

[0204] 42 Lower housing part

[0205] 43 Housing top

[0206] 44 Fluid inlet

[0207] 45 wheel

[0208] 46 Drive motor

[0209] 47 Drive shaft

[0210] 48 Rotor

[0211] 49 Recording section

[0212] 50 recording room

[0213] 51 Closure

[0214] 52 Recording section

[0215] 53 Recording room

[0216] 54 Stator

[0217] 55 floor section

[0218] 56 Wall section

[0219] 57 Rounding

[0220] 58 Connecting section

[0221] 59 Fluid outlet

[0222] 60 Fluid outlet

[0223] 61 Fluid outlet

[0224] 62 Fluid outlet

[0225] 63 End plate

[0226] 64 Connecting section

[0227] 65 wall section

[0228] 66 Feed room 202401693

[0229] 31 / 36

[0230] 67 Heating system

[0231] 68 Plane of symmetry

[0232] 69 feet of space

[0233] 70 feet

[0234] 71 Arrow

[0235] 72 Water switch disc

[0236] 73 Breakthrough

[0237] 74 Breakthrough

[0238] 75 Breakthrough

[0239] 76 Breakthrough

[0240] 77 Water switch drive

[0241] 78 Drive motor

[0242] 79 Drive ring

[0243] 80 worm shaft

[0244] 81 Drive housing

[0245] 82 Gear section

[0246] 83 teeth

[0247] 84 teeth

[0248] 85 Stop bar

[0249] 86 Coupling section

[0250] 87 Coupling subsection

[0251] 88 Coupling subsection

[0252] 89 Coupling subsection

[0253] 90 Coupling bridge

[0254] 91 Coupling bridge

[0255] 92 Coupling bridge

[0256] 93 Recording bag

[0257] 94 Recording bag

[0258] 95 Recording bag

[0259] 96 wave section

[0260] 97 worm gear

[0261] 98 End geometry

[0262] 99 End geometry

[0263] 100 paragraph 202401693

[0264] 32 / 36

[0265] 101 Stop surface

[0266] 102 Stop surface

[0267] A Extraction direction

[0268] AX Axial direction

[0269] E Insertion direction

[0270] F F Rinsing liquid and / or fresh water g Gravity direction

[0271] Q Heat

[0272] R Radial direction

[0273] PO Reference Position

[0274] P1 Position

[0275] P2 Position

[0276] P3 Position

[0277] P4 Position

[0278] P5 Position

[0279] P6 Position

[0280] P7 Position

[0281] P8 Position

[0282] P9 Position

[0283] P10 Position

[0284] S Flow direction x x-direction y y-direction z z-direction

Claims

202401693 33 / 36 PATENT CLAIMS 1. Circulating pump, in particular heating pump, (26) for a water-bearing household appliance, in particular for a household dishwasher (1), comprising a pump housing (41), an impeller (45) arranged within the pump housing (41) for pumping treatment fluid, in particular wash liquor and / or fresh water (F), from a fluid inlet (44) of the pump housing (41) to several fluid outlets (59, 60, 61, 62) of the pump housing (41), and a water diverter (27) integrated into the pump housing (41) for supplying selected fluid outlets (59, 60, 61, 62) with treatment fluid, in particular wash liquor and / or fresh water (F) by means of the water diverter (27), wherein the impeller (45) is rotatably mounted in the pump housing (41) about a central axis (40) of the pump housing (41), wherein the water diverter (27) water diverter drive (77), wherein the water diverter drive (77) is configured to mechanically lock in a reference position (PO),so that the reference position (PO) can be determined using a motor current of the water diverter drive (77).

2. Circulating pump according to claim 1, characterized in that the fluid inlet (44) and the fluid outlets (59, 60, 61, 62) extend along the central axis (40).

3. Circulating pump according to claim 1 or 2, characterized in that the water diverter (27) has a water diverter disk (72) rotatably mounted in the pump housing (41) for releasing or blocking selected fluid outlets (59, 60, 61, 62), wherein the water diverter disk (72) can be rotated from the reference position (PO) clockwise or counterclockwise to different positions (P1, P2, P3, P4, P5, P6, P7, P8, P9, P10) by means of the water diverter drive (77).

4. Circulating pump according to claim 3, characterized in that the pump housing (41) comprises a lower housing part (42) and a housing part (43) connected to the lower housing part. 202401693 34 / 36 has a bonded housing upper part (43), wherein the water diverter disc (72) is arranged between the housing lower part (42) and the housing upper part (43).

5. Circulating pump according to claim 3 or 4, characterized in that the water diverter drive (77) has a drive ring (79) coupled to the water diverter disk (72) and a worm shaft (80), wherein the drive ring (79) and the worm shaft (80) interlock positively to drive the water diverter disk (72), and wherein the drive ring (79) and the worm shaft (80) mechanically lock each other in the reference position (PO).

6. Circulating pump according to claim 5, characterized in that the drive ring (79) has a stop rib (85) extending between two adjacent teeth (83, 84) to mechanically block the screw shaft (80) in the reference position (PO) by means of the stop rib (85).

7. Circulating pump according to claim 6, characterized in that the worm shaft (80) has a worm gear (97) wherein a first end geometry (98) and a second end geometry (99) are integrally formed at the end of the worm gear (97), wherein in the reference position (PO) either the first end geometry (98) or the second end geometry (99) rests against the stop rib (85).

8. Circulating pump according to claim 7, characterized in that the first end geometry (98) and the second end geometry (99) are configured to clear spaces between the teeth (83, 84) of the drive ring (79) during operation of the water diverter drive (77).

9. Circulating pump according to one of claims 5 - 8, characterized in that the drive ring (79) and the screw shaft (80) are arranged in the pump housing such that the drive ring (79) and the screw shaft (80) are immersed at least partially in the treatment fluid, in particular rinsing liquor and / or the fresh water (F) during operation of the circulating pump (26). 202401693 35 / 36 10. Water-bearing household appliance, in particular household dishwasher (1) with a circulation pump (26) according to any one of claims 1-9.

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