Heat pump and domestic dishwasher

Abstract

The invention relates to a heat pump (26) for a domestic dishwasher (1), said heat pump comprising: a heat pump housing (41); an impeller (45), which is provided in the heat pump housing (41), for conveying washing liquor and / or fresh water (F) from a fluid inlet (44) of the heat pump housing (41) to at least one fluid outlet (59, 60) of the heat pump housing (41); and a heating device (69, 69'), which is provided in the heat pump housing (41), for introducing heat (Q) into the washing liquor and / or fresh water (F); wherein the impeller (45) is mounted in the heat pump housing (41) for rotation about a central axis (40) of the heat pump housing (41); wherein the fluid inlet (44) and the at least one fluid outlet (59, 60) extend along the central axis (40); and wherein the heating device (69, 69') has a P-shaped geometry from a top-down view of the heating device (69, 69') along the central axis (40).

Description

[0001] 202401472

[0002] 1 / 37

[0003] Heating pump and household dishwasher

[0004] The present invention relates to a heating pump for a household dishwasher and a household dishwasher with such a heating pump.

[0005] A dishwasher has a wash tub into which items are placed for washing. Spray devices, such as rotating spray arms, can be provided in the wash tub to spray the items with wash water and / or fresh water. These spray devices are part of the dishwasher's hydraulic circuit. A pump sump is located at the bottom of the wash tub, to which a heating pump can be connected; this pump is also part of the hydraulic circuit. The heating pump supplies the wash water and / or fresh water to the spray devices. Furthermore, the heating pump can introduce heat into the wash water and / or fresh water. For this purpose, the heating pump has a heating element.

[0006] DE 102011 079 887 A1, DE 102007 060 193 A1 and DE 102005 043 026 A1 describe such heating pumps for dishwashers.

[0007] Against this background, one object of the present invention is to provide an improved heating pump for a household dishwasher.

[0008] Accordingly, a heating pump for a household dishwasher is proposed. The heating pump comprises a heating pump housing, an impeller arranged within the heating pump housing for pumping wash liquor and / or fresh water from a fluid inlet of the heating pump housing to at least one fluid outlet of the heating pump housing, and a heating device arranged within the heating pump housing for introducing heat into the wash liquor and / or the fresh water, wherein the impeller is rotatably mounted in the heating pump housing about a central axis of the heating pump housing, wherein the fluid inlet and the at least one fluid outlet extend along the central axis, and wherein the heating device is located in a position along the 202401472

[0009] 2 / 37

[0010] The central axis-oriented top view of the heating device has a P-shaped geometry.

[0011] Because the heating element has a P-shaped geometry, it can be manufactured cost-effectively using a bending process due to its simple geometry. Furthermore, the P-shaped geometry allows for the integration of a thermal fuse unit within the heating element.

[0012] The heating pump is a key component of the hydraulic circuit in a household dishwasher. This hydraulic circuit can include several spray devices, such as rotating spray arms. The heating pump supplies these spray devices with wash water and / or fresh water. Simultaneously, the heating pump, via its heating element, can introduce heat into the wash water and / or fresh water. Therefore, a "heating pump" in this context is defined as a pump capable of circulating wash water and / or fresh water within the hydraulic circuit, as well as supplying heat to the circulated wash water and / or fresh water (i.e., the treatment fluid). This circulation is achieved by means of the impeller.The impeller pumps the cleaning solution and / or fresh water from the fluid inlet to at least one fluid outlet during operation of the heating pump. Heat is supplied by the heating element, which is integrated into the heating pump. This type of heating pump can also be called a compact heating pump.

[0013] The heating pump housing is preferably multi-part. For example, the heating pump housing can have a lower housing section and an upper housing section connected to the lower housing section. The impeller is located inside the heating pump housing, and in particular between the lower housing section and the upper housing section. Specifically, the impeller is positioned downstream of the fluid inlet. The impeller can be driven, in particular, by means of a drive motor of the heating pump. The drive motor is an electric motor, in particular a BLDC (brushless DC) motor or a permanent magnet synchronous motor (PMSM) operating as a wet rotor. The drive motor is integrated into the heating pump. In particular, the drive motor can be rigidly connected to the upper housing section. The drive motor has a drive shaft.

[0014] 3 / 37 which rotates around the central axis during operation. The drive shaft is coupled to the impeller.

[0015] The heating pump housing can be constructed, at least in sections, with rotational symmetry about its central axis. This means that parts of the housing may be rotationally symmetrical about the central axis, while other parts may not be. The central axis can also be referred to as the axis of symmetry or the axis of rotation. The heating pump is arranged or installed in the household dishwasher such that the central axis runs along or parallel to a direction of gravity. The central axis is therefore vertically oriented. The heating pump can thus also be called a vertical heating pump.

[0016] The fluid inlet can be fluidically connected to the pump sump of the household dishwasher. This allows the heating pump to draw dishwashing liquid and / or fresh water from the pump sump. The fluid inlet is located, 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 heating 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 located, in particular, on the underside of the heating pump housing, while at least one fluid outlet is located on the top side of the heating pump housing.

[0017] The heating 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 located on the upper part of the housing. The fluid outlets are tubular or hollow cylindrical and run parallel to the central axis. The fluid outlets are spaced apart from the central axis when viewed along a radial direction of the heating pump. The fluid outlets can be arranged unevenly around the central axis. The radial direction is oriented perpendicular to the central axis and points away from it. 202401472

[0018] 4 / 37

[0019] The fluid outlets are part of a water diverter integrated into the heating pump. The water diverter comprises a water diverter disc rotatably mounted in the heating pump housing. The water diverter disc is ring-shaped and features multiple perforations. These perforations allow for the selective opening or closing of individual or multiple fluid outlets. This enables the water diverter to selectively supply individual spray devices with cleaning solution and / or fresh water while simultaneously deactivating other spray devices. It is also possible to supply all spray devices with cleaning solution and / or fresh water simultaneously. Furthermore, the water diverter disc can be used to close all fluid outlets associated with the spray devices and located downstream of the water diverter.However, fluid outlets may also be provided that exit the heating pump housing below or upstream of the water diverter.

[0020] The water diverter disc is arranged within the heating 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, and in particular rotated about its central axis, by means of a water diverter drive, especially a worm gear drive. This water diverter drive can include a drive ring coupled to the water diverter disc and a worm shaft for driving the drive ring. The water diverter drive comprises an electric motor. The drive motor of the water diverter drive can preferably be a BLDC (brushless DC) motor or a permanent magnet synchronous motor that is electrically commutated. This drive motor of the water diverter drive can, in particular, be designed as a wet rotor motor.

[0021] The heating device is, in particular, a so-called tubular heating element. The heating device preferably comprises a metallic outer casing containing a magnesium oxide filling. The outer casing may be made of stainless steel. The magnesium oxide filling consists of compressed magnesium oxide. (In the magnesium oxide filling 202401472)

[0022] 5 / 37 is an embedded heating element, specifically in the form of a spirally wound heating wire. The heating element is electrically connected to connector tabs. The connector tabs can be received in a connector housing. This makes it possible to connect the heating device to a power supply using the connector housing.

[0023] The P-shaped geometry is formed, in particular, by a heating section of the heating device that is at least partially annular, to which a long leg section and a short leg section are attached at their ends. The heating section and the two leg sections together constitute the heating device. In this context, "top view" refers specifically to the view seen by an observer when viewing the heating device along its central axis, i.e., perpendicular to the heating device. The P-shaped geometry can be rotated about the central axis in any orientation. For example, the P-shaped geometry can be positioned horizontally or upside down.

[0024] According to one embodiment, the heating device has a heating section configured to emit heat, a long leg section and a short leg section, wherein the heating section is arranged between the long leg section and the short leg section, wherein the heating section rotates at least partially around the central axis, and wherein the long leg section and the short leg section run parallel to each other at least partially.

[0025] The heating section can be constructed, in particular at least partially, rotationally symmetrical about the central axis. The long leg section and the short leg section each have straight sections or straight areas. These straight sections or straight areas run parallel to each other and are spaced apart. The heating device, in particular the heating section, preferably has exactly one turn. This means, in particular, that the heating device, in particular the heating section, rotates a maximum of one revolution around the central axis. Multiple turns, which are arranged, for example, in a spiral or helical configuration, are therefore preferably not provided. 202401472

[0026] 6 / 37

[0027] According to another embodiment, the heating section and the impeller are arranged concentrically.

[0028] In other words, the heating section and the impeller are at least partially rotationally symmetrical about their common central axis. Specifically, the impeller, viewed along the radial direction of the heating pump, is located within the heating section. Thus, viewed along the radial direction, the heating section is spaced apart from the impeller and arranged around it. The drive motor can also be positioned within the heating section when viewed along the radial direction.

[0029] According to another embodiment, the long leg section and the short leg section have a length ratio of 2:1 to 5:1.

[0030] In particular, the straight section of the long leg and the straight section of the short leg have the aforementioned length ratio. Any other length ratio can also be chosen.

[0031] According to another embodiment, the heating section has an oval cross-sectional geometry, with the long leg section and the short leg section each having a round cross-sectional geometry.

[0032] The oval cross-sectional geometry prevents flow separation at the heating section when flushing fluid and / or fresh water flows into it. This improves heat transfer from the heating section to the flushing fluid and / or fresh water. This, for example, makes it possible to optimize the heating output of the heating system. Due to the round cross-sectional geometry of the long and short leg sections, these can be more easily sealed against the heating pump housing.

[0033] According to a further embodiment, the heating device has a thermal protection unit arranged within the long leg section, with a heat-conducting lance of the thermal protection unit extending into the heating section. 202401472

[0034] 7 / 37

[0035] Thus, the heat-conducting lance extends into an area of ​​the heating unit that is surrounded and therefore cooled by the cleaning solution and / or fresh water. This prevents unwanted false tripping of the thermal safety unit. In addition to the heat-conducting lance, the thermal safety unit preferably includes a fusible link. The heat-conducting lance can supply heat to the fusible link to trigger it. The thermal safety unit is operatively connected to the heating element of the heating unit.

[0036] According to another embodiment, the heating device has a heating element, wherein the heating element and the temperature protection unit are located in a common horizontal plane.

[0037] The heating element can be a heating wire. The horizontal plane can be identical to the previously mentioned plane of symmetry.

[0038] According to another embodiment, the temperature protection unit is located at least partially in a fluid-enclosed area.

[0039] The arrangement in the fluid-enclosed area prevents a false triggering of the temperature safety unit, as it is cooled by the rinsing solution and / or the fresh water.

[0040] According to another embodiment, the temperature safety unit is arranged tangentially to the heating element.

[0041] According to another embodiment, the ratio of an unheated surface area of ​​the long leg section and the short leg section to a heated surface area of ​​the heating section is 1 to 1.5.

[0042] As mentioned previously, only the heating section is suitable for emitting heat. The long leg section and the short leg section are not suitable for emitting heat. The unheated surface of the long leg section and the short leg section 202401472

[0043] 8 / 37

[0044] The leg section is preferably larger than the heated surface area of ​​the heating section. However, the reverse ratio is also possible.

[0045] According to another embodiment, the heating device has a plane of symmetry with respect to which the heating device is symmetrically constructed, wherein the plane of symmetry intersects the impeller.

[0046] In particular, the heating section of the heating device is constructed symmetrically with respect to the plane of symmetry. The P-shaped geometry can lie within the plane of symmetry. The plane of symmetry preferably passes centrally through the heating device, so that the heating device is constructed symmetrically with respect to the plane of symmetry. The plane of symmetry is such that it intersects the impeller. In other words, the plane of symmetry passes through the impeller. The plane of symmetry can also intersect the drive shaft of the drive motor. In particular, a cross-section or cross-sectional area of ​​the heating device is constructed or designed symmetrically with respect to the plane of symmetry.

[0047] According to another embodiment, the plane of symmetry is oriented perpendicular to the central axis.

[0048] In the present case, "perpendicular" shall be understood to mean in particular an angle of 90° ± 10°, preferably of 90° ± 5°, more preferably of 90° ± 3°, more preferably of 90° ± 1°, and more preferably of exactly 90°.

[0049] According to another embodiment, the heating pump has additional fluid outlets provided on the heating pump housing, which open out of the heating pump housing below a water diverter of the heating pump.

[0050] The other fluid outlets can also be referred to as secondary outlets. These additional fluid outlets can lead to a water tank, a fleet storage tank, and / or a heat pump.

[0051] According to another embodiment, a connector housing, in particular a RAST 5 connector, is attached to the heating device. 202401472

[0052] 9 / 37

[0053] Furthermore, a household dishwasher with such a heating pump is proposed.

[0054] 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 may contain several compartments, such as a lower rack, an upper rack, and a cutlery drawer. These compartments hold items that can be sprayed with wash water and / or fresh water by means of the aforementioned hydraulic circuit. 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. These spray devices are also part of the hydraulic circuit. The heating pump supplies the spray devices with wash water and / or fresh water to wet the items being washed.Selective or targeted control of individual or all spray devices is achieved using the water diverter integrated into the heating pump. A spray device in the form of an intensive spray zone can also be provided.

[0055] Other possible implementations of the heating pump and / or the household dishwasher also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In such cases, a person skilled in the art would also add individual aspects as improvements or additions to the respective basic form of the heating pump and / or the household dishwasher.

[0056] Further advantageous embodiments and aspects of the heating pump and / or the household dishwasher are the subject of the dependent claims and the exemplary embodiments of the heating pump and / or the household dishwasher described below. The heating pump and / or the household dishwasher are further explained below with reference to preferred embodiments and the accompanying figures. 202401472

[0057] 10 / 37

[0058] Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher;

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

[0060] Fig. 3 shows a schematic sectional view of an embodiment of a heating pump for the household dishwasher according to Fig. 1;

[0061] Fig. 4 shows the detailed view IV according to Fig. 3;

[0062] Fig. 5 shows a schematic sectional view of the heating pump according to the section line VV of Fig. 3;

[0063] Fig. 6 shows a schematic top view of an embodiment of a heating device for the heating pump according to Fig. 3;

[0064] Fig. 7 shows a schematic sectional view of the heating device according to Fig. 6; and

[0065] Fig. 8 shows a schematic perspective detail view of the heating device according to Fig. 6.

[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. 202401472

[0068] 11 / 37

[0069] 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.

[0070] 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 dishware holder 12 can be a lower dishware holder or a lower basket, dishware holder 13 an upper dishware holder or an upper basket, and 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 pulled or moved out of the wash tub 2 in an extension direction A opposite to the insertion direction 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. 202401472

[0072] 12 / 37

[0073] 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 from above by means of a sieve system 17, preferably inside the rinsing tank 2. The sieve system 17 comprises a surface filter or a surface sieve 18 that covers the pump sump 16.

[0074] 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.

[0075] A drain 22 opens from the pump sump 16, specifically from the pipe section 20. A dewatering pump or emptying pump 23 is connected to the drain 22. Using the dewatering pump 23, contaminated cleaning solution 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 in a building.

[0076] Furthermore, a drain or connecting channel 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 or connecting channel 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. 202401472

[0077] 13 / 37

[0078] 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.

[0079] 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.

[0080] The spray devices 28, 29 can be rotatably mounted spray arms, whereas the spray device 30 can 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 lower rotatable spray arm, is rotatably mounted below the dishware intake 12 about a pivot axis 31 on the base 7, on the pump sump 16, on the screen system 17, or on the heating pump 26. The spray device 28 has spray nozzles that spray the wash liquor and / or the fresh water F upwards into the dishware intake 12 and downwards towards the screen system 17, as shown in Fig. 2.

[0081] The spray device 29, in particular an upper rotatable 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 supplies the dishware holder 14 with wash water and / or fresh water F from above in the orientation shown in Fig. 2. 202401472

[0082] 14 / 37

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Each spray device 28, 29, 30 can have its own supply line 34, 35, 36. Alternatively, some 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.

[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 further comprises a control unit 38. Different wash programs of the household dishwasher 1 can be executed using the control unit 38. For this purpose, wash programs can be stored or saved in the control unit 38. The control unit 38 is preferably arranged outside the wash tub 2. 202401472

[0089] 15 / 37

[0090] The control unit 38 can be arranged in or on the door 3. Preferably, the control unit 38 is provided on an upper edge of the door 3 (not shown). However, the control unit 38 can also be housed in the base support 15. The control unit 38 can be operated or actuated by means of operating elements (not shown). These operating elements can include, for example, buttons, knobs, and / or touchscreens. These can be attached to 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 washing holders 12, 13, 14 (not shown in Fig. 2). The items 39 can be sprayed with washing solution and / or fresh water F by means of the spray devices 28, 29, 30.

[0093] Fig. 3 shows a schematic sectional view of an advantageous embodiment of a heating pump 26 as previously mentioned. Fig. 4 shows the detailed view IV according to Fig. 3. Fig. 5 shows a schematic sectional view of the heating pump 26 according to section line VV of Fig. 3. Reference is made hereafter to Figs. 3 to 5 simultaneously.

[0094] The heating pump 26 is assigned an axial direction AX, which extends from bottom to top in the orientation shown in Fig. 3. 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 is assigned 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.

[0095] The central axis 40 runs along the direction of gravity g or is oriented parallel to it.

[0096] 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 snapped or locked together. However, a bayonet connection and / or a screw connection can also be provided.

[0097] 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.

[0098] 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.

[0099] The lower housing part 42 accommodates an impeller 45, which is arranged downstream of the fluid inlet 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 during operation of the heating pump 26. A rotor 48 of the drive motor 46 is also non-rotatably connected to the drive shaft 47 next to the impeller 45.

[0100] 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 rotates about- 202401472

[0101] Section 17 / 37 closes 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. The first receiving section 49 is closed by a closure 51, oriented downwards in the direction of the impeller 45, as shown in Fig. 3. The drive shaft 47 passes through the closure 51 and can be supported by it.

[0102] The drive motor 46 can preferably be 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.

[0103] 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.

[0104] An annular receiving chamber 53 is provided between the first receiving section 49 and the second receiving section 52. A stator 54 of the drive motor 46 is arranged in the receiving chamber 53. The stator 54 can be bonded to the first receiving section 49 and / or the second receiving section 52.

[0105] 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 extends around the central axis 40, adjoins the wall section 56. The upper housing section 43 is connected to the lower housing section 42 at the connecting section 58. 202401472

[0106] 18 / 37

[0107] The upper housing part 43 has several fluid outlets 59, 60, of which only two are shown in Fig. 3. The supply lines 34, 35, 36 are connected to the fluid outlets 59, 60. If three spray devices 28, 29, 30 are provided, preferably exactly three fluid outlets 59, 60 are also provided. If, for example, four spray devices 28, 29, 30 are provided, four fluid outlets 59, 60 are accordingly provided. The fluid outlets 59, 60 are arranged unevenly distributed around the central axis 40. The fluid outlets 59, 60 are oriented vertically upwards and thus along the central axis 40.

[0108] Fluid outlets 59 and 60 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. In addition to fluid outlets 59 and 60, the heating pump 26 may have a secondary side outlet for a possible additional feature.

[0109] The fluid outlets 59, 60 are tubular and extend along the central axis 40 or along the axial direction AX. The fluid outlets 59, 60 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.

[0110] The fluid outlets 59, 60 extend from a closing plate 61 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 62 runs around the closing plate 61, by means of which the upper housing part 43 is connected to the connecting section 58 of the lower housing part 42.

[0111] The upper housing part 43 further comprises a tubular or hollow cylindrical wall section 63, which is arranged within the wall section 56 of the lower housing part 42. The wall section 63 is, in particular, part of the second receiving section 52. The wall section 63 is rotationally symmetrical about the central axis 40. An annular gap or supply chamber 64 is formed between the two wall sections 56, 63, which is filled with flushing solution and / or fish water F during operation of the heating pump 26. [202401472]

[0112] 19 / 37

[0113] During operation of the heating pump 26, the rinsing fluid and / or the fresh water F flows around the central axis 40 through the supply chamber 64.

[0114] A water diverter disc 65, rotatable about the central axis 40, is arranged between the upper housing part 43, in particular the end plate 61, and the lower housing part 42. The water diverter disc 65 is part of the water diverter 27. The water diverter disc 65 is rotationally symmetrical about the central axis 40. The water diverter disc 65 has a central opening 66. The second receiving section 52 with the wall section 63 passes through the opening 66. The opening 66 is preferably circular. The water diverter disc 65 is annular, in particular circular. The feed chamber 64 supplies the rinsing solution and / or the fresh water F to the water diverter disc 65.

[0115] Furthermore, the water diverter disc 65 has several openings 67, of which only one is shown in Fig. 3. By rotating the water diverter disc 65 about the central axis 40, the fluid outlets 59, 60 can be selectively blocked or opened using the openings 67. In Fig. 3, for example, fluid outlet 59 is opened and fluid outlet 60 is blocked, so that flushing fluid and / or fresh water F can only flow out through fluid outlet 59.

[0116] The openings 67 can be circular. The openings 67 can also be oblong. Using the oblong geometry, it is possible to open several of the fluid outlets 59, 60 simultaneously. The number of openings 67 can correspond to the number of fluid outlets 59, 60. However, this is not mandatory. The fluid outlets 59, 60 can be combined in any way using the water diverter disc 65.

[0117] A water diverter drive, for example comprising an electric motor, is provided to rotate the water diverter disc 65 about the central axis 40. The water diverter 27 thus has the previously described water diverter disc 65 and the water diverter drive. The water diverter drive has a drive ring coupled to the water diverter disc 65 and a worm shaft for driving the drive ring. The water diverter drive includes an electric motor, for example in the form of a permanent magnet synchronous motor. 202401472

[0118] 20 / 37

[0119] The feed chamber 64 extends to the water diverter disc 65. The feed chamber 64 is rotationally symmetrical about the central axis 40. In front of the water diverter disc 65, the feed chamber 64 widens and distributes the rinsing solution and / or the fresh water F onto the water diverter disc 65. Alternatively, the feed chamber 64 can also be bounded along its longitudinal extent from bottom to top by parallel wall sections 63, 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 65 is integrated into the feed chamber 64. The fluid outlets 59, 60 open out of the feed chamber 64.

[0120] In the annular supply chamber 64, 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. 5) around the central axis 40 and through those fluid outlets 59, 60 which 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.

[0121] 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 68. 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.

[0122] The heating pump 26 further comprises a heating element 69 for introducing heat Q into the flushing solution and / or the fresh water F. The heating element 69 is an electric heating element. The heating element 69 can be a tubular heating element or be described as such. The heating element 69 is annular and rotates at least partially around the central axis 40. The heating element 69 can be rotationally symmetrical about the central axis 40, at least partially. The heating element- 202401472

[0123] 21 / 37 The heating element 69 is located below the supply chamber 64 and is surrounded by flushing fluid and / or fresh water F during operation of the heating pump 26. Viewed along the axial direction AX, the heating element 69 is located at least partially at the level of the impeller 45.

[0124] The heating device 69 is associated with a plane of symmetry 70, with respect to which the heating device 69 is symmetrically constructed. The plane of symmetry 70 intersects the central axis 40 and is arranged perpendicular to it. The plane of symmetry 70 also intersects the impeller 45. Furthermore, the plane of symmetry 70 can also intersect the drive shaft 47.

[0125] The heating element 69 is placed on spacer feet 71, 72, 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 71, 72 can be provided, which can be arranged evenly distributed around the central axis 40. The spacer feet 71, 72 are not shown in Fig. 4. The spacer feet 71, 72 can be made, for example, of metal, plastic, or ceramic. If the spacer feet 71, 72 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 71, 72 can also be overmolded with a material from which the lower housing part 42 is made.The spacer feet 71, 72 prevent the heating device 69 from resting directly on the floor section 55, so that a complete flow around the heating device 69 with rinsing solution and / or fresh water F is possible.

[0126] As shown in Fig. 4, the heating device 69 comprises a metallic outer casing 73 filled with a compressed magnesium oxide filling 74. The magnesium oxide filling 74 is shown hatched. A heating element 75, for example in the form of a heating wire, is embedded in the magnesium oxide filling 74. The heating element 75 may be spirally wound. The outer casing 73 may be made of stainless steel.

[0127] The heating device 69, in particular a cross-section or cross-sectional area of ​​the heating device 69, can be assigned a center point 76 which lies on the plane of symmetry 70. The center point 76 is located midway along the radial direction R between the wall sections 56, 63, in particular between the inner surfaces of the wall sections 56, 63. 202401472

[0128] 22 / 37

[0129] The heating element 69 can be constructed with a cross-section that is rotationally symmetrical or approximately rotationally symmetrical about the center point 76. Preferably, the center point 76 also serves as the center point of a curved inner surface 77A of the rounded section 57. This means that the heating element 69 and the inner surface 77A share the center point 76. In particular, the heating element 69 is positioned such that it is located centrally between the inner surface 77A and a curved inner surface 77B of the upper housing part 43. The radii of the heating element 69 and the two inner surfaces 77A, 77B can, in particular, lie at least approximately on a common line or straight line.

[0130] The outer radius of the heating element 69 and the inner radius of the inner surface 77A have approximately the same center point 76. The heating element 69 is located in a 90° deflection zone 78 of the cleaning solution and / or the fresh water F. The heating element 69 lies, at least in some areas, on the same plane as the impeller 45. The heating element 69 and the impeller 45 are preferably arranged concentrically. The deflection zone 78 distributes the cleaning solution and / or the fresh water F radially outwards.

[0131] Preferably, the heating device 69 is not circular in cross-section, but at least partially elliptical or oval, as indicated in Fig. 4 by a dashed line and the reference numeral 69'. In this case as well, the heating device 69' is symmetrical about the plane of symmetry 70. The oval cross-sectional geometry of the heating device 69' prevents flow separation at the heating device 69' when flushing liquor and / or fresh water F flows onto it, thus improving heat transfer from the heating device 69' to the flushing liquor and / or fresh water F. This increases the efficiency of the heating device 69'.

[0132] The heating device 69 is arranged at least partially within the deflection area 78 located below the supply chamber 64. The deflection area 78 extends from the fluid inlet 44 to the supply chamber 64. A boundary 79 between the supply chamber 64 and the deflection area 78 is shown in Fig. 4 with a dotted line. The boundary 79 can be defined by a lower edge of the second 202401472

[0133] 23 / 37

[0134] The intake section 52 is formed. The heating device 69 can project at least partially from the deflection area 78 into the feed chamber 64.

[0135] In the deflection area 78, the cleaning solution and / or the fresh water F is deflected, in particular by 90°. The heating device 69 is positioned in the deflection area 78 such that the gap width of each gap between the lower housing part 42 and the upper housing part 43, through which the cleaning solution and / or the fresh water F can flow, is the same on the right and left sides of the heating device 69 in the orientation shown in Fig. 4.

[0136] During operation of the heating pump 26, the cleaning solution and / or the fresh water F flows from the impeller 45 along the radial direction R outwards towards the radius 57. At the inner surface 77A of the radius 57, the cleaning solution and / or the fresh water F is diverted upwards along the axial direction AX towards the water diverter disc 65. Simultaneously, the cleaning solution and / or the fresh water F flows around the central axis 40 along the flow direction S. In this process, the heating element 69 is surrounded by the cleaning solution and / or the fresh water F, and the heating element 69 transfers heat Q to the cleaning solution and / or the fresh water F.

[0137] The heating element 69 is located on the same plane as the impeller 45 when viewed along the axial direction AX. Thus, the heating element 69 is directly exposed to the flushing solution and / or the fresh water F flowing from the impeller 45, generating optimal heat transfer from the heating surface of the heating element 69. To further optimize energy dissipation from the heating element 69, the flushing solution and / or the fresh water F is deflected upwards directly in the deflection area 78 where the heating element 69 is positioned. The lower housing part 42 and the upper housing part 43 thus enclose the heating element 69, forming an optimal flow space for energy dissipation from the heating surface. This optimized energy dissipation allows for an increased surface load on the heating element 69, resulting in a lower overall material usage and reduced costs.

[0138] Above the heating device 69 is the supply chamber 64 in front of the water diverter 27, which is controlled by the horizontally aligned water diverter disc 65, which is controlled by 202401472

[0139] The various fluid outlets 59, 60 are opened and closed by the perforations 67 of 24 / 37. The water diverter disc 65 is also positioned by the lower housing part 42 and the upper housing part 43.

[0140] The water diverter disc 65 is mounted in a floating manner in the aforementioned drive ring, so that the water diverter disc 65 can be driven via the drive ring. Furthermore, the water diverter disc 65 floats upwards 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 integrated openings for the fluid outlets 59, 60 in the housing upper part 43 as tightly as possible without requiring an additional elastomer seal. Minor leakage is permissible at this point; however, the smaller this leakage, the lower the flow losses in the hydraulic circuit 37.

[0141] The fluid outlet 59 extends vertically upwards, so that no further deflection of the rinsing solution and / or the fresh water F is necessary for the flow to the spray device 28, and thus flow losses are minimal. This also applies to the remaining fluid outlets 60. Here, too, no further deflection of the rinsing solution and / or the fresh water F is necessary for passage into the rinsing chamber 4.

[0142] Fig. 6 shows a schematic top view of an embodiment of a heating device 69 as previously described. In the top view, the heating device 69 has a P-shaped geometry. The P-shaped geometry is shown lying down in Fig. 6. The heating device 69 comprises two connector tabs 80, 81, which are electrically connected to the heating element 75.

[0143] The heating device 69 has a heating section 82, shown in hatched areas. Only the heating section 82 is capable of emitting heat Q. The heating section 82 is annular. In particular, the heating section 82 is rotationally symmetrical about the central axis 40. The heating section 82 and the impeller 45 are arranged concentrically. In addition to the heating section 82, the heating device 69 has two leg sections 83, 84, which are at least partially straight, and to which the connector tabs 80, 81 are attached.

[0144] 25 / 37

[0145] A long or first leg section 83 and a second or short leg section 84 are provided. The heating section 82 is arranged between the leg sections 83 and 84. The leg sections 83 and 84 are not suitable for dissipating heat Q. The heating section 82 preferably has an oval cross-section, whereas the leg sections 83 and 84 preferably have a round cross-section. The leg sections 83 and 84 run parallel to each other, at least in sections.

[0146] Returning to Fig. 5, the heating device 69 has a connector housing 85 in which the connector tabs 80, 81 are received. The connector housing 85 can be plugged onto the connector tabs 80, 81 and locked or snapped into place with them. The leg sections 83, 84 are guided radially out of the deflection area 78 by means of a flange section 86 integrally formed on the lower part of the housing 42. The flange section 86 is not shown in Fig. 3. The connector housing 85 is attached to the flange section 86. A latching or snap-fit ​​connection can be provided for this purpose.

[0147] The heating pump 26 offers the following advantages: a very compact design, a very low profile, a reduced number of parts and therefore lower complexity, a reduced number of pressurized seals, and optimized installation through a single vertical mounting movement. The drive motor 46 is located in the center of the heating pump 26, resulting in reduced noise emission. Flow-optimized integration of the heating element 69 into the heating pump 26 is achieved with lower material costs. Hydraulic losses are reduced, resulting in optimized system efficiency of the hydraulic circuit 37.

[0148] Fig. 7 shows a schematic sectional view of the heating device 69. Fig. 8 shows a schematic detail view of the heating device 69. Reference is made hereafter to Figs. 7 and 8 simultaneously.

[0149] The heating device 69 has two connecting bolts 87, 88, which extend outwards from the leg sections 83, 84. The connector tab 80 is attached to the connecting bolt 87. The connector tab 81 is attached to the connecting bolt 88. The connecting bolt 88 is electrically connected to the heating element 75. 202401472

[0150] 26 / 37

[0151] The connecting bolt 88 extends through the short leg section 84 into the heating section 82.

[0152] A thermal fuse unit 89 is positioned between the connecting bolt 87 and the heating element 75. The thermal fuse unit 89 is not shown in Fig. 5. The thermal fuse unit 89 comprises a fuse 90 and a heat-conducting lance 91. The connecting bolt 87 is connected to the heating element 75 via the thermal fuse unit 89. The heat-conducting lance 91 extends into the heating section 82.

[0153] An end piece 92 with a grounding lug 93 is attached to leg sections 83 and 84. The grounding lug 93 is electrically connected to the outer sheath 73. For this purpose, the grounding lug 93 can be electrically connected to the outer sheath 73 by means of the end piece 92. The grounding lug 93, together with the plug lugs 80 and 81, is accommodated in the plug housing 85.

[0154] The leg sections 83, 84 are enclosed in a capsule body 94 shown in Fig. 5, which is designed as an insert in the lower housing part 42. The capsule body 94 extends through the wall section 56 of the lower housing part 42. The capsule body 94 is at least partially received in the flange section 86. The capsule body 94 serves to displace cleaning solution and / or fresh water F from the flange section 86, thus ensuring that the fusible link 90 is always located outside the cleaning solution and / or fresh water F and is not cooled by it. The fusible link 90 is intended to react only to the temperature of the heating element 75.Without the capsule body 94 in the flange section 86, the situation could otherwise arise that there is too little or no flushing fluid and / or fresh water F in the deflection area 78, so that the heating element 75 becomes uncooled and very hot, while there is still flushing fluid and / or fresh water F in the flange area 86, which cools the fusible link 90, so that the fusible link 90 does not respond in time.

[0155] The heating element 69 is bent into a P-shaped geometry only in two dimensions. Due to the P-shaped geometry, a long straight section is formed in the shape of the long leg section 83. The long leg section 83 is longer than the short leg section 84. The long leg section 83 is used for integration 202401472.

[0156] 27 / 37 of the temperature safety unit 89 is important because in an area of ​​the heating device 69 where the temperature safety unit 89 is located, no mechanical deformation and / or bending of the heating device 69 is possible.

[0157] The two leg sections 83, 84 form a length ratio of between 2:1 and 5:1 in their straight portions. Because the leg sections 83, 84 are not heated, no post-processing of the outer contour of the heating element 69, in particular no post-embossing, is required. Therefore, the heating element 69 can have a round cross-section at the leg sections 83, 84, whereas the heating area 82 has an oval cross-section, as indicated in Fig. 4 by the dashed line and the reference numeral 69'. This round cross-sectional geometry makes it possible to represent the necessary sealing and press geometry for mounting the heating element 69 in the heating pump 26.

[0158] Due to its size and dimensions, the heating element 69 has a ratio between an unheated surface and a heated surface in the range of 1 to 1.5. The heating element 69 can, for example, have a heating output of 2080W. The ideal curved diameter of the heating section 82 is between 75 mm and 100 mm.

[0159] The temperature protection unit 89 of the heating device 69 is positioned within the long leg section 83 of the P-shaped geometry of the heating device 69 such that at least areas and / or partial areas of the temperature protection unit 89 are still exposed to rinsing solution and / or fresh water F. For this purpose, the heat-conducting lance 91 projects into the heating section 82. The geometry of the heating device 69 is selected such that the long leg section 83 approaches a bending radius of the heating section 82 tangentially, thus minimizing mechanical stress in the area of ​​the temperature protection unit 89 when the P-shaped geometry is bent.

[0160] The position of the temperature safety unit 89 in the heating pump 26 when the heating device 69 is installed is defined such that the temperature safety unit 89 is located at least partially or completely in an area of ​​the heating pump 26 through which flushing fluid and / or fresh water F flows, and thus during normal operation of the heating pump 26.

[0161] 28 / 37 pump 26 with heating an area of ​​the heating device 69, in which the temperature safety unit 89 is connected to the heating element 75, receives good cooling.

[0162] The advantage here is that the thermal fuse unit 89 can be designed so that, during normal operation of the heating pump 26, it is cooled by the cleaning solution and / or the fresh water F. This ensures that in the event of a fault, for example, if the heating element 69 is unintentionally switched on without cleaning solution and / or fresh water F, the thermal fuse 90 trips very quickly due to its connection to the heating element 75, thus preventing further damage. This cooling during normal operation prevents the thermal fuse unit 89 from tripping unintentionally and ensures a rapid shutdown of the heating element 69 in the event of a fault.

[0163] The leg sections 83, 84, and thus also the connecting bolts 87, 88, are arranged parallel to each other by the P-shaped geometry and can be spaced 10 mm to 20 mm apart. The connector tabs 80, 81, which are required for the electrical contact of the heating element 75, are arranged so that they are mirror images of each other. The corresponding grounding tab 93 is integrated between the two connector tabs 80, 81. The spacing is chosen such that the grounding tab 93 is located between the connector tabs 80, 81, and the connector tabs 80, 81 and the grounding tab 93 have a pitch of 5 mm, which makes it possible to connect the heating device 69 with a standardized 3-pin RAST 5 connector, for example in the form of the connector housing 85.

[0164] The heating pump 26 with the heating element 69 has the following advantages. The P-shaped geometry is a simple bending geometry. This results in an advantage in manufacturing and therefore also a cost advantage. The integration of the thermal safety unit 89 into a cooled area of ​​the heating element 69 enables a reliable design of the tripping temperature of the thermal safety unit 89. This results in a robust and intrinsically safe design due to the integrated thermal safety unit 89. This increases the safety of the device. The two-dimensional bending geometry of the heating element 69 allows for simple crimping of the heating section 82 to achieve an oval cross-sectional geometry. (202401472)

[0165] 29 / 37 result in service life advantages. The RAST 5 connector area allows the use of the standardized 85 connector housing. This results in cost advantages.

[0166] Although the present invention has been described using exemplary embodiments, it can be modified in many ways.

[0167] 202401472

[0168] 30 / 37

[0169] Reference symbols used:

[0170] 1 household dishwasher

[0171] 2 washing containers

[0172] 3 Door

[0173] 4. Dishwashing area

[0174] 5 swivel axes

[0175] 6 Feed opening

[0176] 7 Floor

[0177] 8 ceiling

[0178] 9 Back panel

[0179] 10 side wall

[0180] 11 Side wall

[0181] 12 Dishwashing tray

[0182] 13 Dishwashing tray

[0183] 14 Dishwashing tray

[0184] 15 base carriers

[0185] 16 Pump sump

[0186] 17 Sieve system

[0187] 18 surface sieve

[0188] 19 fine sieve

[0189] 20 Raw area

[0190] 21 Cleanroom

[0191] 22 Procedure

[0192] 23 Drain pump

[0193] 24 Wastewater pipe

[0194] 25 Procedure

[0195] 26 Heating pump

[0196] 27 Water diverter

[0197] 28 Spray device

[0198] 29 Spray device

[0199] 30 Spray device

[0200] 31 Rotation axis

[0201] 32 Rotary axis 202401472

[0202] 31 / 37

[0203] 33 Rotation axis

[0204] 34 Supply line

[0205] 35 Supply line

[0206] 36 Supply line

[0207] 37 Hydraulic circuit

[0208] 38 Control unit

[0209] 39 items washed

[0210] 40 Center axis

[0211] 41 Heating pump housings

[0212] 42 Lower housing part

[0213] 43 Housing top

[0214] 44 Fluid inlet

[0215] 45 wheel

[0216] 46 Drive motor

[0217] 47 Drive shaft

[0218] 48 Rotor

[0219] 49 Recording section

[0220] 50 recording room

[0221] 51 Closure

[0222] 52 Recording section

[0223] 53 Recording room

[0224] 54 Stator

[0225] 55 floor section

[0226] 56 Wall section

[0227] 57 Rounding

[0228] 58 Connecting section

[0229] 59 Fluid outlet

[0230] 60 Fluid outlet

[0231] 61 End plate

[0232] 62 Connecting section

[0233] 63 Wall section

[0234] 64 Feed room

[0235] 65 Water soft disc

[0236] 66 Breakthrough 202401472

[0237] 32 / 37

[0238] 67 Breakthrough

[0239] 68 Arrow

[0240] 69 Heating system

[0241] 69' Heating system

[0242] 70 Plane of symmetry

[0243] 71 feet of spacer

[0244] 72 feet

[0245] 73 Outer shell

[0246] 74 Magnesium oxide filling

[0247] 75 Heating element

[0248] 76 Center point

[0249] 77A Internal surface

[0250] 77B Interior surface

[0251] 78 Deflection area

[0252] 79 border

[0253] 80 plug flag

[0254] 81 plug flag

[0255] 82 Heating section

[0256] 83 thigh section

[0257] 84 thigh section

[0258] 85 connector housings

[0259] 86 Flange section

[0260] 87 connecting bolts

[0261] 88 connecting bolts

[0262] 89 Temperature fuse unit

[0263] 90 fuse

[0264] 91 Heat conduction lance

[0265] 92 End piece

[0266] 93 Grounding flag

[0267] 94 capsule bodies

[0268] A Extraction direction

[0269] AX Axial direction

[0270] E Insertion direction 202401472

[0271] 33 / 37 F Rinsing solution and / or fresh water g Gravity direction

[0272] Q Heat

[0273] R Radial direction

[0274] S Flow direction x x-direction y y-direction z z-direction

Claims

202401472 34 / 37 PATENT CLAIMS 1. Heating pump (26) for a household dishwasher (1), comprising a heating pump housing (41), an impeller (45) arranged within the heating pump housing (41) for conveying wash liquor and / or fresh water (F) from a fluid inlet (44) of the heating pump housing (41) to at least one fluid outlet (59, 60) of the heating pump housing (41), and a heating device (69, 69') arranged within the heating pump housing (41) for introducing heat (Q) into the wash liquor and / or the fresh water (F), wherein the impeller (45) is rotatably mounted in the heating pump housing (41) about a central axis (40) of the heating pump housing (41), wherein the fluid inlet (44) and the at least one fluid outlet (59, 60) extend along the central axis (40), and wherein the heating device (69, 69') is mounted in a position along the central axis (40) oriented top view of the heating device (69, 69') has a P-shaped geometry.

2. Heating pump according to claim 1, characterized in that the heating device (69, 69') has a heating section (82) configured to emit heat (Q), a long leg section (83) and a short leg section (84), wherein the heating section (82) is arranged between the long leg section (83) and the short leg section (84), wherein the heating section (82) rotates at least partially around the central axis (40), and wherein the long leg section (83) and the short leg section (84) run parallel to each other at least partially.

3. Heating pump according to claim 2, characterized in that the heating section (82) and the impeller (45) are arranged concentrically.

4. Heating pump according to claim 2 or 3, characterized in that the long leg section (83) and the short leg section (84) have a length ratio of 2:1 to 5:

1. 202401472 35 / 37 5. Heating pump according to one of claims 2 - 4, characterized in that the heating section (82) has an oval cross-sectional geometry, wherein the long leg section (83) and the short leg section (84) each have a round cross-sectional geometry.

6. Heating pump according to one of claims 2 - 5, characterized in that the heating device (69, 69') has a temperature protection unit (89) which is arranged within the long leg section (83), wherein a heat conducting lance (91) of the temperature protection unit (89) extends into the heating section (82).

7. Heating pump according to claim 6, characterized in that the heating device (69, 69') has a heating element (75), wherein the heating element (75) and the temperature protection unit (89) are located in a common horizontal plane.

8. Heating pump according to claim 6 or 7, characterized in that the temperature protection unit (89) is located at least partially in a fluid-flowing area.

9. Heating pump according to one of claims 6 - 8, characterized in that the temperature protection unit (89) is arranged tangentially to the heating element (75).

10. Heating pump according to one of claims 2 - 9, characterized in that the ratio of an unheated surface of the long leg section (83) and the short leg section (84) to a heated surface of the heating section (82) is 1 to 1.

5.

11. Heating pump according to one of claims 1 - 10, characterized in that the heating device (69, 69') has a plane of symmetry (70) with respect to which the heating device (69, 69') is symmetrically constructed, wherein the plane of symmetry (70) intersects the impeller (45). 202401472 36 / 37 12. Heating pump according to claim 11, characterized in that the plane of symmetry (70) is oriented perpendicular to the central axis (40).

13. Heating pump according to one of claims 1 - 12, characterized by further fluid outlets provided on the heating pump housing (41), which open out of the heating pump housing (41) below a water diverter (27) of the heating pump (26).

14. Heating pump according to one of claims 1 - 13, characterized in that a plug housing (85), in particular a RAST 5 plug, is attached to the heating device (69, 69').

15. Household dishwasher (1) with a heating pump (26) according to one of claims 1 - 14.

Images