Domestic dishwasher with a pump device and pump device for a water-carrying domestic appliance

Abstract

The invention relates to a domestic dishwasher (1) with a washing container (2) for holding items to be washed (G), a hydraulic circuit (33) for applying the rinsing liquid (F) to the items to be washed (G), and a pump device (19) having a fluid-conveying channel (121) and for circulating the rinsing liquid (F) in the hydraulic circuit (33), wherein the pump device (19) has a central axis (20) orientated along a direction of gravity (g), wherein the pump device (19) has a water diverter (23) integrated in a housing (35) of the pump device (19) for selectively distributing the rinsing liquid (F) to multiple fluid outlets (51, 52, 53, 54) of the pump device (19), and wherein multiple, in particular all, fluid outlets (51, 52, 53, 54) are orientated along the central axis (20).

Description

[0001] Household dishwasher with a pumping device and pumping device for a water-conducting household appliance

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

[0003] A household dishwasher has a wash tub in which washware can be accommodated. A hydraulic circuit or circulation circuit is provided to supply the washware with wash liquid, i.e., so-called wash liquor and / or fresh water. This circuit comprises spray devices and / or other liquid supply units in the wash chamber of the wash tub, as well as the wash chamber itself. The spray devices can, for example, be designed as spray arms rotatably mounted in or on the wash tub. To supply the spray devices and / or the other liquid supply units with wash liquid, the hydraulic circuit of the household dishwasher has a circulation pump.This is fluidically connected to a liquid collection area in the bottom area of ​​the washing container and / or below it, in which the washing liquid introduced into the washing chamber by means of the spray elements and / or other liquid application units collects under the influence of gravity. In particular, a pump sump is provided as the liquid collection area, which is preferably arranged below the bottom of the washing container and in which the washing liquid sprayed or otherwise distributed in the washing chamber by means of the spray devices and / or the other liquid application units, in particular onto the washware, collects. The pump sump can in particular be designed as a pot-shaped container which is arranged below an opening in the bottom wall of the washing container and is connected in a liquid-tight manner to an edge of the bottom wall of the washing container surrounding the opening.The breakthrough opening can preferably be covered on the top, in particular at least partially, by a surface filter. If necessary, one or more further filters, such as a coarse filter and / or a microfilter, can be accommodated in the pump sump as part of a filter system. The circulation pump is fluidly connected to this pump sump, in particular via an intake nozzle or connecting channel. It preferably sucks in washing liquid from the liquid collection area, in particular the pump sump, during washing operation of the household dishwasher and pumps this either directly to the spray devices and / or other liquid application units and / or via a downstream water diverter into supply lines that lead to the spray devices and / or other liquid application units.The distribution of the rinsing liquid to at least a portion of the various spray devices and / or other liquid application units is therefore carried out with the aid of a so-called water switch as a further component of the hydraulic circuit. With the aid of this, the rinsing liquid delivered by the circulation pump can be pumped optionally into the supply lines to these spray devices and / or other liquid application units, which can be fluidically connected to it. Optionally means that by means of the water switch, the supply line leading to the respective spray device and / or the respective liquid application unit, which can be fluidically connected to it, can be individually, i.e.can be selectively supplied with rinsing liquid (and all other supply lines are blocked), or several or even all of the supply lines that are fluidically connected to it and lead to the spray devices and / or to the other liquid supply units can be supplied with rinsing liquid at the same time. In practice, a circulating pump has usually been used for household dishwashers to date, in which the motor shaft of its drive motor, which drives an impeller or impeller in rotation in the pump chamber of the circulating pump, is generally arranged horizontally. In order to be able to heat the rinsing liquid pumped by the circulating pump to a desired temperature when required, e.g. for a cleaning and / or rinsing cycle of a dishwashing program, a heater can also be integrated into the pump housing of the circulating pump. Alternatively, the heater can also be separate from the pump housing, e.g.be arranged after the circulation pump and before the water switch.

[0004] Against this background, it is an object of the present invention to provide an improved household dishwasher.

[0005] Accordingly, a household dishwasher is proposed, comprising a washing container for holding wash ware, a hydraulic circuit or circulation circuit for supplying wash liquid to the wash ware, and a pumping device for circulating the wash liquid in the hydraulic circuit. The pumping device has a central axis oriented along a direction of gravity. The pumping device has a water diverter integrated into a housing of the pumping device for selectively distributing the wash liquor and / or the fresh water to a plurality of fluid outlets. At least one of the fluid outlets, preferably several of the fluid outlets, and in particular all of the fluid outlets, is oriented along the central axis.

[0006] By integrating the water diverter into the housing of the pumping device, a particularly compact design of the pumping device can be achieved. Furthermore, since at least one of the fluid outlets, preferably several of the fluid outlets, in particular all of them, are oriented along the central axis, complete venting of the pumping device is possible without any additional measures.

[0007] The washing compartment is preferably cuboid-shaped. The washing compartment can be closed by means of a door, in particular a front door, pivotably attached to the washing compartment. Several washware receptacles, for example, a lower basket, an upper basket, and a cutlery drawer, can be provided in the washing compartment. The washware can be accommodated in the receptacles, to which wash liquid is applied via the hydraulic circuit. The wash liquid can, in particular, be so-called wash liquor and / or fresh water. "Applying" in this case can, in particular, include spraying or wetting the washware. "Wash liquor" is understood to mean water to which, depending on the wash phase of a dishwashing program, a cleaning agent, rinse aid, and / or dirt particles detached from the washware are added.

[0008] The hydraulic circuit or circulation circuit can preferably comprise a plurality of spray devices, for example in the form of spray arms and / or intensive spray zones, and / or other fluid supply units, which are arranged within the washing chamber of the washing container. The spray devices and / or fluid supply units can, in particular, be rotatably mounted in the washing container. The spray devices and / or other fluid supply units are connected to the fluid outlets of the pump device via supply lines. The pump device forms a component of the hydraulic circuit. The fact that the pump device "supplies" the hydraulic circuit with washing fluid means, in this case, in particular, that the pump device pumps the washing fluid through the hydraulic circuit. The pump device is, in particular, a circulation pump, preferably a heating pump.The pumping device can therefore also be referred to as a circulation pump or a heating pump. Particularly preferably, the pumping device is a compact heating pump and can therefore also be referred to as such.

[0009] The pumping device is designed to circulate washing liquid in the hydraulic circuit, which includes the washing container as a component. Furthermore, the pumping device can also be designed to introduce heat into the washing liquid. For this purpose, it can have a heater in its housing. The pumping device is preferably fluidically connected to a pump sump of the household dishwasher. In particular, it can be attached to the pump sump of the household dishwasher. The pumping device is preferably arranged below the bottom wall of the washing container in a base support of the household dishwasher.

[0010] The pumping device is preferably constructed essentially rotationally symmetrically to its central axis. "Essentially" means that parts of the pumping device are constructed rotationally symmetrically to the central axis, although it cannot be ruled out that other parts of the pumping device are not constructed rotationally symmetrically to the central axis. The central axis is oriented, in particular, parallel to the direction of gravity.

[0011] The fact that the central axis is "oriented" along the direction of gravity or parallel to the direction of gravity can, in this case, mean in particular that the central axis is inclined or tilted relative to the direction of gravity by up to ± 20°, preferably by up to ± 10°, more preferably by up to ± 5°, more preferably by up to ± 3°, more preferably by up to ± 1°. However, the central axis can also run exactly along the direction of gravity, so that no tilting or inclination relative to the direction of gravity occurs. Depending on the installation situation, a suitable slight tilt or inclination can be selected. According to an advantageous embodiment, the water diverter has a water diverter element accommodated within the housing and rotatable about the central axis for selectively opening and closing the fluid outlets.

[0012] According to an advantageous development of the invention, viewed from bottom to top along the central axis, the functional sections of the liquid conveying channel of the pumping device according to the invention are provided at successive heights, as functional sections of the liquid conveying channel of the pumping device according to the invention, including a pump inlet, a pump chamber or impeller chamber with an impeller or impeller that can be driven in rotation therein for conveying the rinsing liquid, a pressure and / or diffuser chamber arranged downstream of the pump chamber, a water diverter element that can be rotated about the central axis in the upper end section of the pressure and / or diffuser chamber, and the plurality of fluid outlets of the pumping device. The term "liquid conveying channel" is understood to mean the cavity provided in the housing of the pumping device according to the invention, which is filled and flowed through by the rinsing liquid during conveying operation of the pumping device.Due to this vertical sequence of the various functional sections of the liquid conveying channel of the pumping device according to the invention, the flushing liquid is guided from the pump inlet to the outlet opening of the respective fluid outlet in the housing, rising from bottom to top, against the direction of gravity. Deflections and / or reflections of the flushing liquid with a directional component in the direction of gravity, i.e. in the opposite direction to its bottom-up conveying direction, are largely avoided. A retrograde flow of the flushing liquid conveyed by the impeller on its way through the liquid conveying channel from bottom to top is therefore largely avoided. In addition, the sequential arrangement of the various functional sections of the liquid conveying channel is advantageous for a simple design and the associated simple manufacture of the pumping device according to the invention. Conversely, this can bein the event of repair, it can be easily disassembled and every essential component of the pump device according to the invention is accessible. Furthermore, this sequence of the various functional sections of the liquid conveying channel ensures that the flushing liquid can flow completely downwards via the pump inlet solely through the effect of gravity when the drive motor for the impeller is switched off and the impeller is stationary. To ensure that the liquid conveying channel runs completely dry, it is particularly advantageous if the pump inlet is expediently provided at the lowest point of the pump device according to the invention. This prevents residual water from remaining in the liquid conveying channel of the housing of the pump device according to the invention when the drive motor of its impeller is out of operation.As a result, there is little or no risk of dirty water and / or lye carryover when changing from one partial wash cycle, such as the cleaning cycle, to the subsequent partial wash cycle, such as the intermediate rinse cycle or final rinse cycle of the wash cycle of a dishwashing program. This is because, when changing the rinse bath, the rinse liquid used for the respective partial wash cycle can now flow at least almost completely out of the pump device according to the invention and be removed from the hydraulic circuit, in particular by pumping out the pump sump using a drain pump. New rinse liquid, in particular fresh water, can be supplied to the hydraulic circuit for the next partial wash cycle without this being able to mix with dead or residual water from the previous partial wash cycle. As a result, fewer or no stains from dirt particles, limescale particles, etc., remain on the rinsed and subsequently dried items.more available, resulting in improved rinsing results. In particular, the intermediate rinse cycle previously required between the cleaning cycle and the final rinse cycle can now be carried out with a smaller amount of fresh water, if necessary, or even eliminated entirely, since rinsing out residual or dead water contaminated with dirt particles and / or cleaning agents from the pumping device is no longer absolutely necessary.

[0013] In particular, in the pump device according to the invention, with the central axis oriented along the direction of gravity, which preferably corresponds to the axis of rotation of the motor shaft for the impeller, the pump inlet or the suction opening is arranged centrally to the at least approximately vertically aligned motor shaft and the impeller mounted concentrically thereon, i.e., its suction direction runs at least approximately vertically from bottom to top. As a result, the flushing fluid present in the fluid conveying channel, i.e., in the fluid-conducting cavity of the housing, can flow particularly quickly and completely from top to bottom out of the pump inlet when the drive motor for the impeller drive shaft changes from its on state to its off state.According to an advantageous development of the invention, the pumping device has a fluid conveying channel with such fluid-directing geometries of its wall boundaries that direct the flushing fluid from bottom to top, at least after the pump chamber arranged downstream of the pumping device's pump inlet, in which the impeller for conveying the flushing fluid is rotatably housed, in particular from the inlet opening of the pump inlet, to the outlet opening of the fluid outlet, which can be opened by means of the water diverter, in particular the water diverter element, and supplied with flushing fluid. This improves the hydraulic efficiency of the pumping device according to the invention. Furthermore, it can be improved, in particular at least almost completely, idle when the drive motor associated with its impeller or impeller is switched off. Zones, in particular flat, horizontal surfaces, or depressions, depressions, etc. ..., on or in which flushing liquid can remain as dead water or residual water in the housing of the pump device after the drive motor for the impeller has been switched off, are thus minimized or even non-existent.

[0014] In particular, the pumping device according to the invention conveys the rinsing liquid from the pump inlet, in particular at least after leaving the pump chamber with the impeller, with a primary preferred direction, i.e. at least approximately parallel to the central axis from bottom to top. There are no lateral horizontal surfaces arranged perpendicular to the central axis or even depressions on which rinsing liquid would remain when the drive motor of the impeller stops, on or in the boundary walls of the liquid conveying channel in the housing of the pumping device according to the invention. When the drive motor of the impeller is switched on, i.e. during conveying operation of the pumping device according to the invention, air inclusions in the liquid conveying channel are thus at least almost avoided.

[0015] According to an advantageous development of the invention, the pump inlet, the pump chamber with the impeller rotatably provided therein, the diffuser and / or pressure chamber, and / or the water diverter element in the upper end section of the pressure and / or diffuser chamber, which is widened in particular with regard to its passage cross-section, are each arranged and designed rotationally symmetrically to the central axis. This is advantageous in order to ensure the lowest possible hydraulic resistance within the liquid conveying channel for the flushing liquid conveyed or pumped there from bottom to top by the impeller when the impeller is driven in rotation by the drive motor. The structure and design of the pumping device are also simplified by the rotational symmetry of its functional sections or units.

[0016] The fluid outlets are expediently each tubular or nozzle-shaped, and their outlet openings are arranged, in particular, at the highest point(s) of the fluid conveying channel of the pumping device leading from the pump inlet to the outlet openings of the fluid outlets. This optimizes the hydraulic efficiency of the pumping device according to the invention. This is because the flushing fluid, conveyed from bottom to top through the pressure and / or diffuser chamber by the rotating impeller, continues its forward movement, parallel to the central axis and directed from bottom to top, at least virtually unchanged through the fluid outlet opened by the water diverter element.As a result, the hydraulic resistance for the flushing fluid as it flows from the pressure and / or diffuser chamber into the one or more fluid outlets opened by means of the water diverter element can be kept low or minimal, unlike in the case of fluid outlets leading radially outwards from the pressure and / or diffuser chamber.In addition, complete venting of the liquid conveying channel upwards is ensured when filling the pump device with flushing liquid via its pump inlet, which is fluidically connected to the pump sump (with the drive motor for the impeller stopped and / or running) and / or during operation of the drive motor, in which the liquid conveying channel in the housing of the pump device leading from the pump inlet to the fluid outlet opened by the water diverter element is completely filled with flushing liquid and the fluid flows through it from bottom to top, since there are no air chambers in the upper area of ​​the housing of the pump device, such as those that can occur with radially running fluid outlets. The always complete venting of the pump device according to the invention is very advantageous for its smooth pumping and conveying operation. Its full hydraulic efficiency is always available. Furthermore, annoying snorkeling noises are avoided.

[0017] The pump device according to the invention, which is designed in particular as an at least almost "vertical rotor", is characterized in particular in that when its liquid conveying channel is filled with rinsing liquid, any air present in the housing is automatically displaced upwards by the upwardly rising rinsing liquid level and can escape from the housing via the upwardly directed, in particular protruding, fluid outlets. The liquid conveying channel runs from the pump inlet of the pump device according to the invention to the outlet opening of the respective fluid outlet released, i.e. opened, by the water diverter element. Between the pump inlet and the respective open fluid outlet, it comprises the pump chamber with the impeller accommodated there, as well as the downstream pressure and / or diffuser chamber of the pump device according to the invention.In particular, when the cavity of the liquid conveying channel is completely filled with rinsing liquid, all of the air is displaced upwards from the liquid conveying channel, i.e. from the liquid-conducting cavity of the housing of the pumping device according to the invention. The motor shaft with the impeller can also be stationary when the pumping device is being filled with rinsing liquid, i.e. the drive motor for the shaft can be switched off. When the drive motor is put into operation or when the drive motor is started and / or, of course, also during ongoing conveying operation of the pumping device according to the invention, which then pumps rinsing liquid from bottom to top against the direction of gravity in its pumping chamber by means of an impeller or impeller, any air bubbles present in the liquid conveying channel of the housing are entrained or carried away by the upward-flowing rinsing liquid.entrained and always reliably pushed out of the housing of the pumping device according to the invention via the upwardly directed fluid outlets.

[0018] In contrast, in a radial pump with a horizontally aligned center axis, its pump inlet or intake port is positioned centrally to the horizontally arranged motor shaft with the impeller, i.e., its intake direction is horizontal. As a result, when the horizontally arranged radial pump is stationary—i.e., when its drive motor is switched off and the motor shaft with the impeller is stationary—a residual amount of flushing fluid always remains at the bottom of the pump chamber as dead water, with a water level that is lower than the lower edge or bottom of the intake port.Above this residual water there is air in the pump chamber of the pump housing of this horizontally arranged radial pump. When the radial pump is restarted this air is drawn radially inwards to a central area around the axis of rotation of the impeller attached to the front of the motor shaft, while the flushing liquid set in rotation by the impeller is thrown radially outwards due to its greater mass and the centrifugal forces acting on it. This creates an air bubble enclosed radially on the outside by flushing liquid in the central area of ​​the pump chamber defined by the axis of rotation of the impeller or its imaginary extension. In order to be able to remove this air via the radial outlet of the radial pump, a diffuser element such as a fixed guide vane with preferably helical blade sections is provided in the pressure chamber downstream of the pump chamber.

[0019] In the pumping device according to the invention, however, the air can always escape completely upwards from the pump housing via the fluid outlets oriented along the central axis, preferably projecting vertically, thus ensuring complete venting of the housing of the pumping device according to the invention. It can remain free of a guide vane, thus saving a component.

[0020] The housing of the pump device is preferably made up of several parts. For example, the housing can have a lower housing part, an upper housing part, and an inner housing part. The lower housing part, the upper housing part, and / or the inner housing part can be plastic components, in particular injection-molded plastic components. This allows the pump device to be manufactured cost-effectively. The lower housing part, the upper housing part, and / or the inner housing part can be connected to one another in a form-fitting manner. A form-fitting connection is created by the interlocking or engaging of two components. Latching hooks, snap hooks, or the like can be provided to create the form-fitting connection.

[0021] The fact that the water diverter is "integrated" into the housing means in particular that the water diverter is at least partially located within the housing. However, it is possible for the housing to be at least partially part of the water diverter. For example, the aforementioned inner housing part and the upper housing part are at least partially part of the water diverter. The water diverter is therefore not spatially separated from the pumping device. With the help of the water diverter, it is possible to selectively distribute the rinsing liquid, i.e., the rinsing solution and / or the fresh water, to the various fluid outlets. Selected fluid outlets can be selectively blocked or released. This means that either the respective fluid outlet is individually, i.e., selectively blocked, released, or opened, or several, i.e., at least two, fluid outlets are simultaneously or jointly blocked, blocked, released, or opened.For this purpose, a water diverter element rotatably mounted in the housing is preferably provided. As previously mentioned, at least a portion of the fluid outlets is in fluid communication with the spray devices and / or other fluid application units. The water diverter thus makes it possible to specifically control individual spray devices and / or other fluid application units.

[0022] It is also possible to supply all spray devices and / or other liquid application units with rinsing liquid, i.e., rinsing liquor and / or fresh water, simultaneously.

[0023] The fluid outlets are preferably tubular or nozzle-shaped. The fluid outlets can, in particular, be part of the water diverter. The fluid outlets can, in particular, have a circular, oval, or annular cross-section. The fact that the fluid outlets are "oriented" along the central axis means, in particular, that the fluid outlets extend out of the housing along the central axis or along an axial direction of the pumping device. The axial direction is oriented parallel to the central axis or coincides with it. The respective fluid outlet is oriented along the central axis. In particular, it is directed upwards. Preferably, it protrudes upwards at least almost vertically.

[0024] A radial direction of the pumping device, however, is arranged in particular perpendicular to the central axis or perpendicular to the axial direction. Preferably, several of the, in particular all or all, fluid outlets of the pumping device leading to spray devices and / or other liquid impingement units, whose passages for rinsing liquid or rinsing liquor can be controlled or regulated by means of the water diverter, in particular partially or completely opened and / or closed, run along the central axis or along the axial direction. If necessary, the pumping device can also have, in addition to these one or more fluid outlets running parallel to the central axis, one or more fluid outlets that are oriented transversely to the central axis, in particular perpendicular to the central axis and thus along the radial direction.

[0025] According to an advantageous development of the invention, the water diverter element can be arranged at least approximately in a plane perpendicular to the central axis, i.e. in an at least almost horizontal plane, when viewed in plan view from above along the central axis, and can preferably be at least approximately circular in shape. Between its inner circular edge and its outer circular edge, which is arranged concentrically to the inner circular edge at a radial outward distance, it has a plurality of openings or through openings in the axial direction, in particular in the vertical direction, with the aid of which individual or several of the fluid outlets or all of the fluid outlets can be opened in a targeted manner. For this purpose, the water diverter element is rotated in such a way that an opening in the water diverter element is located upstream of the respective fluid outlet to be opened.To block or close one or more of the fluid outlets or all of the fluid outlets, the water diverter element is rotated in such a way that its closed wall part covers the inlet opening of the inlet opening(s) of the several or all of the fluid outlets on the upstream side.

[0026] According to a further embodiment, the water diverter element comprises a circular disc and a drive ring for driving the circular disc. It is thus preferably constructed in two parts. The drive ring is expediently coupled to the circular disc in a force-transmitting manner for rotating it in its direction of rotation.

[0027] The annular disc can preferably be arranged on top of the drive ring, in particular resting on it when the pumping device is emptied of flushing liquid, and mechanically coupled to the drive ring in the circumferential direction. From a spatial perspective, the drive ring, apart from its external toothing, can in particular be shaped approximately like a thin-walled annular cylinder with a small vertical extension and a small radial wall thickness. Its external toothing is located on the outer surface of this annular cylinder below its upper, annular end face, which serves to preferably flatly support the annular disc of the water diverter element in a plane perpendicular to the central axis, in particular at least approximately horizontal. The central axis of the pumping device according to the invention runs through its center. The annular disc can lie flat on the upper end wall of this drive ring, for examplethe pumping device is emptied of flushing fluid and / or the impeller is stationary. In particular, the outer diameter of the annular disc corresponds at least approximately to the outer diameter of the drive ring or is slightly smaller than this. The inner diameter of the annular disc is, in particular, twice a predetermined radial projection width smaller than the inner diameter of the drive ring. Thus, the annular disc projects beyond the circular-cylindrical inner surface of the drive ring with a radially inwardly projecting annular wall in which the previously described openings of the water diverter element are provided.

[0028] The aforementioned openings in the water diverter element are preferably provided on the annular disc. The drive ring preferably has a toothing, in particular an external toothing, to drive the drive ring. It is designed, in particular, as an annular gear ring.

[0029] The drive ring preferably comprises one or more drivers to establish a force-transmitting coupling or connection between the drive ring and the annular disc when the drive ring rotates in its respective rotational direction. These drivers can preferably extend from the top, in particular upwards, out of an upwardly facing end face of the drive ring. The drivers are particularly designed to engage in recesses provided on the annular disc, which can in particular be provided, for example, on the outer edge, so that the drive ring is coupled to the annular disc in a force-transmitting manner in its respective rotational direction.The recesses in the annular disc for engaging the drivers of the drive ring can be through-holes, in particular from bottom to top, preferably perpendicular to the plane of the annular disc, or they can be blind holes provided in the underside of the annular disc assigned to the top side of the drive ring. The drivers are preferably distributed unevenly around the central axis on the upper end face of the drive ring, so that when the annular disc and the drive ring are assembled, a coding is implemented which prevents incorrect assembly of the water diverter disc (Poka Yoke). Viewed along the central axis or along the axial direction, the annular disc can be lifted off the drive ring, so that the annular disc can float on the flushing liquid when the pumping device is in operation. However, the connection orCoupling is maintained between the drive ring and the annular disc in the respective rotational direction of the drive ring. As the annular disc floats, it can be pressed internally against a preferably flat end plate of the housing's interior to reliably seal fluid outlets that need to be closed.

[0030] In particular, the drivers of the drive ring sit in their associated recesses in the annular disc with play such that, during pumping operation of the pumping device, the annular disc can be pushed upwards and floated by the flushing fluid pumped from bottom to top until it is pressed in the pressure / diffuser chamber against a preferably flat end plate of the housing interior or against a limiting element protruding downwards from the end plate in order to reliably seal fluid outlets that are to be closed. However, the respective driver remains in engagement with the recess in the annular disc assigned to it. For this purpose, it bears in particular on a partial length of the limiting wall of the recess assigned to it, towards which it runs when the drive ring is driven to rotate in its respective direction of rotation.

[0031] In particular, the circular disc sits on top of the upper end face of the drive ring when the level of the rinsing liquid in the pressure and / or diffuser chamber is lower than the upper end face of the drive ring, in particular when the drive motor of the feed pump of the pumping device according to the invention is switched off and the rinsing liquid has flowed out of the liquid feed channel downwards via the pump inlet from the housing of the pumping device.

[0032] Preferably, the respective driver protrudes from the top of the drive ring in the vertical or axial direction (along the central axis) with a height extension that is greater than the maximum intended floating or lifting distance of the annular disc in the vertical direction. This ensures that the respective driver of the drive ring always overlaps with a boundary wall of the recess in the associated recess of the annular disc, at least over a partial length of its height extension.The maximum floating distance corresponds in particular to the free height difference between the height of the upper side of the annular disc, when it rests in contact with the upper end face of the drive ring, and the underside of the cover plate, which is preferably a component of the inner housing part and covers the annular outlet opening of the upper section of the pressure and / or diffuser chamber - preferably widened in terms of its passage cross-sectional width - and in particular has the fluid outlets directed upwards along the central axis, or at least a limiting element that is attached to the underside of the cover plate in a downwardly projecting manner. The drivers of the drive ring thus remain in engagement with the annular disc even when it floats upwards, i.e.The coupling between the drive ring and the annular disc remains intact in the direction of rotation of the drive ring, even when the annular disc floats. Thus, the annular disc can be rotated circumferentially, i.e., both clockwise and counterclockwise, by rotating the drive ring, even when it floats.

[0033] The drive ring expediently has a flat upper side or end face when viewed in its at least approximately horizontal plane, so that the annular disc can sit there in a defined reference position when the level of the flushing liquid is lower than the height of the upper end face of the drive ring, e.g. when the drive motor of the feed pump is switched off and the flushing liquid has completely flowed out of the housing from the pressure and / or diffuser chamber and the pump chamber downwards via the pump inlet. This reference position of the annular disc largely ensures that the annular disc can float up without critical tilting when the drive motor of the feed pump is switched on due to the pumped flushing liquid pressing upwards from below. The teeth of the drive ring are provided in particular below the flat upper support or seating surface on its radially outward-facing wall.According to a further embodiment, the drive ring is received in an annular groove provided in the housing, in particular a circular-cylindrical groove. The annular groove preferably runs vertically from bottom to top parallel to the central axis and is open, i.e., accessible, from above. The drive ring can thus be inserted into it from above during assembly of the pumping device or removed from it upwards during disassembly of the pumping device. The annular groove is preferably formed on the upper end section of the circular-cylindrical wall of the upper housing section.

[0034] The annular groove is preferably formed on the upper housing section, in particular on its upper, approximately circular-cylindrical end section. The annular groove is filled with rinsing solution and / or fresh water when the pressure and / or diffuser chamber is completely filled with rinsing liquid. The drive ring is located in the annular groove. The annular groove runs completely around the central axis of the pump device.

[0035] According to a further embodiment, the housing has a drainage opening pointing in the direction of the central axis, which is in fluid communication with the annular groove.

[0036] Exactly one drainage opening can be provided. However, multiple drainage openings can also be provided. The drainage opening allows flushing fluid to drain from the annular groove. The fact that the drainage opening is "fluidically connected" to the annular groove means, in this case, that the flushing fluid can flow from the annular groove through the drainage opening in the direction of the central axis into the pressure and / or diffuser chamber.

[0037] According to a further embodiment, the drive ring is rotatably mounted on guide webs that project radially into the annular groove. The guide webs are preferably provided on the radially inner wall of the annular groove. They project radially outwards into the annular groove, i.e., viewed in the radial direction, they project into the annular groove, and each form bearing points for the inner edge of the drive ring. They hold the drive ring in a defined position, preferably with respect to the central axis of the pumping device as its predetermined axis of rotation, when it is rotated into a desired angular position. Viewed in a sectional plane perpendicular to the central axis, they are preferably designed in the shape of a circular ring segment. Between each two guide webs that are adjacent in the circumferential direction, there is a radial gap or radial play between the drive ring and the radially inner wall of the annular groove.In this way, when the drive ring rotates, it only rubs along the guide webs provided in sections along the circumferential direction, which contributes to reducing friction between the drive ring and the ring groove. This allows for reduced friction when the drive ring rotates. The number of guide webs is optional. Preferably, however, at least three guide webs are provided. However, four or more than four guide webs can also be provided.

[0038] According to a modified design variant, it may be advantageous if the one or more drivers are provided on the annular disc and the corresponding recesses are provided on the drive ring. The above statements regarding the two-part variant of the water diverter element, in which the one or more drivers are located on the drive ring and the corresponding recesses are located on the annular disc, apply accordingly to the modified design variant.

[0039] As an alternative to the two-part variant of the water diverter element explained above, in which the drive ring and the annular disc are provided as two components that can be coupled to one another in the direction of rotation and moved away from one another vertically or along the central axis, according to an advantageous embodiment, the drive ring and the annular disc can be firmly connected to one another to form a single unit or can be formed, in particular molded, as a single unit. They can, in particular, form a single, preferably one-piece, preferably material-synthetic, component. They then float together as a whole when the pumping device is in pumping operation.

[0040] According to a further embodiment, the water diverter comprises a water diverter drive for driving the drive ring, wherein a drive shaft of the water diverter drive is oriented transversely, in particular perpendicularly, to the central axis. "Perpendicularly" in this case means an angle of 90° ± 10°, preferably 90° ± 5°, more preferably 90° ± 3°, more preferably 90° ± 1°, more preferably exactly 90°. The water diverter drive comprises an electric motor. The water diverter drive is preferably a so-called wet-running drive. Preferably, the motor shaft and the rotor of the drive motor of the water diverter drive attached thereto are located in the wet space of a housing that is fluidically connected to the pressure and / or diffuser space and is thus also filled with the flushing fluid when the pump space and the pressure and / or diffuser space are filled with flushing fluid via the pump inlet, particularly, for example, during pumping operation of the pump device.The water diverter drive can preferably comprise a first, in particular tubular, housing part, which is integrally formed with the upper housing part of the pump device housing. It is fluidly connected to the upper region of the pressure and / or diffuser chamber, in particular to the annular groove into which the drive ring is inserted. A second, in particular tubular, housing part can expediently be positively connected, in particular latched or snapped, to the first housing part, preferably as an extension thereof, with the second housing part closing the first housing part like a lid. The two housing parts enclose an interior space which is filled with flushing fluid when the pump device is completely filled with flushing fluid, in particular during operation of the pump device.The water diverter drive further comprises, in particular, a stator attached to the outside of the second housing part and a rotor rotatable centrally to the stator, which is arranged within the fluid-filled interior of the second housing part. The rotor is connected in a rotationally fixed manner to the drive shaft or motor shaft of the water diverter drive motor, which in turn is rotatably mounted on the two housing parts. A worm is attached to the drive shaft—preferably at its end section facing away from the rotor—which engages with the toothing, in particular external toothing, of the drive ring to form a meshing area. In particular, where the meshing zone is between the worm and the toothing, in particular external toothing, of the drive ring, the radially outer wall of the annular groove is omitted or interrupted. The toothing of the drive ring and the worm can, in particular, have globoid toothing.The interior of the water diverter drive can preferably be drained in the direction of the central axis via the annular groove in which the drive ring is accommodated and the drainage opening. In particular, with regard to a drive ring with external gearing, it may be expedient if the section, in particular the end section of the drive shaft opposite the drive motor of the water diverter drive, which has the gear worm, rests at least approximately tangentially on the outside against the external gearing of the drive ring, forming a meshing area between the external gearing of the drive ring and the gear worm, in which they mesh.

[0041] In particular, with regard to a drive ring with external toothing, on which the gear worm of the water diverter drive engages to form an external meshing area, it can be expedient if one or more guide webs are provided on the side of the drive ring opposite the external meshing area, viewed in the radial direction, projecting radially outwards on the inner part of the housing, in particular on the radially inner wall of the annular groove. These guide webs act as a counterbearing for the drive ring when the worm of the water diverter drive meshes with the external toothing of the drive ring. This is because they support the inner edge of the drive ring from the inside. This can be particularly advantageous if the drive ring has radial play in the annular groove.In particular, a guide web can be arranged in the meshing area between the external toothing of the drive ring and the gear worm engaging it, on the two edge zones of the meshing area, symmetrically to its center or on both sides of the meshing area, from the inner housing part, in particular from the radially inner wall of the annular groove, projecting radially outwards into the annular groove against the inner edge of the drive ring. This largely prevents the drive ring from deflecting radially inwards when the worm meshes in and / or on its external toothing. This ensures perfect power transmission from the worm to the drive ring in the tangential direction, so that the drive ring can be rotated efficiently by the worm.

[0042] According to a further embodiment, the pump device comprises a drive motor with a rotor for driving the impeller of the pump device and a stator, wherein the rotor is received in a first receiving section of the housing, and wherein the stator is received in a second receiving section of the housing. Preferably, the first receiving section and the second receiving section are part of the housing interior. The first receiving section is preferably pot-shaped and is closed off in the direction of the pump chamber with the impeller there by means of a closure. The first receiving section encloses a receiving space in which the rotor is received. The rotor is connected in a rotationally fixed manner to a drive shaft or motor shaft of the drive motor. Likewise, the impeller is connected in a rotationally fixed manner to the drive shaft, preferably at its end section opposite the rotor, which projects downwards into the pump chamber along the central axis.The drive shaft is preferably rotatably mounted on the first receiving section and optionally on the closure. The second receiving section is preferably also pot-shaped. The first receiving section and the second receiving section are arranged in opposite directions so that the second receiving section is open facing away from the impeller. The second receiving section is arranged radially at a distance from the first receiving section and concentrically surrounds the first receiving section so that, viewed in a sectional plane perpendicular to the central axis, an annular receiving space is formed between the first receiving section and the second receiving section. Viewed spatially, this receiving space is circularly cylindrical. It is accessible from above. The stator of the drive motor can be easily inserted into it from above.The second receiving section thus encloses a preferably circular-cylindrical receiving space in which the preferably circular-cylindrical stator of the drive motor is accommodated. The stator can, for example, be glued to the first receiving section and / or to the second receiving section or secured in some other way in the receiving space between the first receiving section and the second receiving section.

[0043] According to an advantageous embodiment, the first receiving section is arranged within the second receiving section.

[0044] Preferably, both the first receiving section and the second receiving section are constructed rotationally symmetrically to the central axis of the pumping device, with the first receiving section being arranged within the second receiving section and the second receiving section being arranged outside the first receiving section. According to a further advantageous embodiment, the second receiving section extends through the water diverter element, in particular through its annular disc.

[0045] In particular, the second receiving section can also function as a bearing for the water diverter element. The second receiving section extends, in particular, through both the drive ring and the annular disc of the water diverter element. The second receiving section preferably extends through the central opening of the water diverter element, in particular the annular disc and the drive ring. Viewed differently, the water diverter element, in particular the annular disc and the drive ring of the water diverter element, surrounds the second receiving section on the outside.

[0046] According to a further advantageous embodiment, a pressure and / or diffuser chamber is formed in the housing, which, viewed along a radial direction of the pump device, is delimited radially inwardly by the second receiving section and radially outwardly by a tubular heating element encircling the second receiving section. Spatially, the tubular heating element surrounds at least one tubular section of the second receiving section oriented along the central axis, in particular a circular-cylindrical section, in particular at least approximately concentrically with a predetermined radial spacing.Thus, at least the longitudinal section of the pressure and / or diffuser chamber, which is formed between the wall section of the second receiving section oriented along the central axis, in particular extending at least approximately perpendicularly, and the tubular heating element arranged radially further outwardly relative to the central axis, in particular at least approximately concentrically, is annular in a sectional plane perpendicular to the central axis, and, spatially speaking, is at least approximately circular-cylindrical in shape. As a result, a small amount of flushing fluid in the pump device according to the invention is sufficient to efficiently heat it to a desired temperature by means of the tubular heating element.This is because in the annular, in particular circular-cylindrical, gap between the tubular heating element, which is arranged radially on the outside and oriented along the central axis, and the wall section of the second receiving section, which is arranged radially further inwards and oriented along the central axis, a rotational flow of the pumped flushing liquid, generated by the impeller arranged in the pump chamber, moves from bottom to top (in the axial direction). This brings about an at least largely uniform heat transfer from the tubular heating element to the flushing liquid, both in the circumferential direction and along the longitudinal extent of the tubular heating element (parallel to the central axis). When the impeller arranged in the pump chamber is rotated by means of the motor shaft of the drive motor, the liquid in the pump chamber is set in rotation. A rotational flow or circulating flow of the flushing liquid is created in the radially outer region of the pump chamber orImpeller chamber, which moves through the pressure and / or diffuser chamber fluidically arranged downstream of the pump chamber (viewed in a sectional plane perpendicular to the central axis) in a ring-shaped manner, spatially viewed in particular at least in sections in a circular-cylindrical manner, from bottom to top along the central axis of the pump device according to the invention (in the axial direction).

[0047] In particular, the pressure and / or diffuser chamber extends at least along the entire vertical extent of the stator of the drive motor. This allows the waste heat of the entire stator to be transferred to the flushing fluid flowing through the pressure and / or diffuser chamber via the partition wall of the second receiving section of the housing, which is parallel to the central axis and in particular vertical, which further improves the energy efficiency of the pumping device according to the invention.

[0048] According to an advantageous development of the invention, the pressure and / or diffuser chamber has an upward outlet opening at the upper end of its end section, which is in particular widened with respect to its passage cross-section. The water diverter element, in particular its annular disc, at least partially covers the annular, in particular circular, upward-facing outlet opening of the upper, in particular widened, annular, spatially viewed in particular at least approximately circular-cylindrical section of the pressure and / or diffuser chamber, which outlet opening is located in a plane perpendicular to the central axis, in particular arranged in an at least approximately horizontal plane. The annular, in particular circular, outlet opening of the pressure and / or diffuser chamber is preferably positioned higher than the ceiling wall of the first receiving section of the housing.In summary, this means in particular that the rinsing liquid comes into direct contact with the tubular heating element when flowing through the pressure and / or diffuser chamber. The tubular heating element is tubular or hollow cylindrical. The tubular heating element is in particular a thick-film heating element. The pressure and / or diffuser chamber extends from the pump or impeller chamber of the pumping device in the direction of its water diverter, in particular in the direction of its water diverter element. Viewed in a sectional plane perpendicular to the central axis, the impeller chamber is preferably disc-shaped, while the pressure and / or diffuser chamber fluidically downstream of the impeller chamber is annular, in particular circular, in the region of the tubular heating element and the second receiving section.From a spatial perspective, the pressure and / or diffuser chamber is thus preferably circular-cylindrical in shape, particularly at least where the tubular heating element is assigned to it as its outer boundary wall. If necessary, it can widen in its upper section towards the water diverter of the pumping device in order to be able to provide a required outer diameter and inner diameter of the annular disc of the water diverter element and thus a desired radial width of the annular disc. This may be necessary in order to be able to provide the one or more openings in the annular disc through which flushing liquid is to flow, each with a required radial extent that at least approximately matches the respective radial extent of the one or more fluid outlets. In particular, the radial extent or width of the respective opening corresponds to the radial extent or radial width of the inlet opening of the respective fluid outlet assigned to it.

[0049] According to a further advantageous embodiment, the housing has a lower housing part and an upper housing part, wherein the tubular heating element is arranged between the lower housing part and the upper housing part, viewed along the central axis.

[0050] The tubular heating element is preferably sealed from the lower housing section by means of a sealing device. A sealing element, for example in the form of an O-ring, can also be provided to seal the tubular heating element from the upper housing section. According to a further advantageous embodiment, the fluid conveying channel can widen from the pump inlet toward the water diverter. This particularly means that the cross-sectional area of ​​the fluid conveying channel can increase from the pump inlet toward the water diverter, in particular the water diverter element.

[0051] In particular, the upper end section of the pressure and / or diffuser chamber of the liquid conveying channel, viewed in the conveying direction, can be widened compared to its one or more upstream, below or lower, preceding sections, the pressure and / or In particular, the pressure and / or diffuser chamber, viewed in the axial direction, widens after the tubular heating element in its upper end section in the region of the water switch, in particular the water switch element, i.e. there in the region of the water switch element, the passage cross-sectional area of ​​the pressure and / or diffuser chamber is larger than the passage cross-sectional area of ​​its upstream or in front of and lower section, which in particular comprises the tubular heating element as a radially outer boundary wall.

[0052] According to an advantageous development, a deflection section for the rinsing liquid can be provided between the, in particular at least approximately horizontally extending, floor of the pump chamber and the lower end section of the upwardly directed, in particular at least approximately vertically upwardly projecting, pressure and / or diffuser chamber. The deflection section is designed to deflect the rinsing liquid coming with a radial directional component from the, in particular at least approximately horizontally arranged, pump chamber upwards in the axial direction. Starting from the radially outer region of the floor of the pump chamber, it extends upwards, in particular in a concave shape, and nestles with its upper end section against the upright, in particular at least approximately vertical, inner wall surface of the lower section of the pressure and / or diffuser chamber or merges into it. This meansIt advantageously forms a negative (concave) rounded edge, in particular an edge of at least approximately 90°, between the bottom section of the pump chamber or the lower housing part, which in particular extends at least approximately horizontally, and the lower end section of the outer wall of the upwardly, preferably at least approximately vertically, projecting pressure and / or diffuser chamber. As a result, reflections and / or turbulences of the flushing fluid flow are largely avoided in the transition region between the bottom of the pump chamber and the upwardly, in particular at least approximately vertically, projecting outer wall of the lower section of the pressure and / or diffuser chamber.The hollow-shaped transition area between the floor of the pump chamber, which in particular runs at least approximately horizontally, and the upwardly directed, in particular at least approximately vertically upwardly projecting, outer wall of the lower end section of the pressure and / or diffuser chamber prevents the flushing liquid flow from detaching from the outer wall boundary in the transition zone of the liquid flow channel, which lies between the pump chamber, which runs transversely, in particular at least approximately perpendicularly, to the central axis, and the pressure and / or diffuser chamber, which is arranged downstream of the pump chamber in the conveying direction and projects upwards, in particular at least approximately vertically. This optimizes the hydraulic efficiency of the pump device for its conveying operation, reduces the dead volume of the pump device, and reduces or minimizes residues.The accumulation of rinsing fluid within the pumping device occurs when the pumping device's feed pump is switched off, and the rinsing fluid flows back from the rinsing fluid channel to the pump inlet under gravity and out of it. This helps improve the pumping device's idling. This also leads to improved hygienic conditions within the pumping device.

[0053] According to an advantageous development, a sealing device can be provided between the lower housing part and the tubular heating element of the pump device. The sealing device is designed to seal the tubular heating element fluid-tight against the lower housing part. In particular, the sealing device is arranged and constructed rotationally symmetrically to the central axis. The sealing device is preferably a sealing ring. In particular, the sealing device can comprise a V-shaped receiving section, which is received in an annular groove in the lower housing part that is shaped to match its outer geometry. The V-shaped receiving section expediently has an annular groove that runs completely around the central axis in the circumferential direction and in which the tubular heating element is received.The annular groove is preferably provided between a first, upwardly projecting leg and a second, upwardly projecting leg of the receiving section arranged radially further inwards relative to the first leg.

[0054] The sealing device can preferably comprise a deflection section for the rinsing liquid. In particular, the deflection section can extend from the top side of the second leg. The deflection section is designed to deflect the rinsing liquid, which comes with a radial directional component from the pump chamber, which is arranged at least approximately horizontally, upwards in the axial direction. The deflection section expediently has an annular, in particular circular, contact surface on the underside, with which it rests on the inside against the housing lower part. From there, it extends upwards, in particular in a concave shape, and nestles with its upper end section against the upright, in particular at least approximately vertical, inner wall surface of the tubular heating element. This meansIt advantageously forms a negative (concave) rounded edge, here in the exemplary embodiment in particular an edge of at least approximately 90°, between the floor section of the pump chamber or the housing base, which in particular runs at least approximately horizontally, and the lower end section of the tubular heating element projecting upwardly, preferably at least approximately vertically. As a result, reflections and / or turbulences of the flushing fluid flow are largely avoided in the transition area between the floor of the pump chamber and the tubular heating element projecting upwardly, in particular at least approximately vertically.Due to the hollow-shaped transition area between the floor of the pump chamber, which in particular runs at least approximately horizontally, and the lower end section of the tubular heating element, which is directed upwards, in particular projects at least approximately vertically upwards, a detachment of the fluid flow from the outer wall boundary in the transition zone of the liquid flow channel, which lies between the pump chamber, which runs transversely, in particular at least approximately perpendicularly, to the central axis, and the pressure and / or diffuser chamber arranged downstream of the pump chamber in the conveying direction and projects upwards, in particular at least approximately vertically, is avoided, which improves the hydraulic efficiency of the pump device.

[0055] This sealing device thus fixes the tubular heating element within the pumping device and simultaneously seals it. Furthermore, the sealing device comprises a hydraulically optimized geometry that optimizes the hydraulic efficiency of the pumping device for its conveying operation, reduces the dead volume of the pumping device, and reduces or minimizes residues or accumulations of flushing fluid within the pumping device when the pumping device's feed pump is switched off and the flushing fluid flows back from the flushing fluid channel to the pump inlet under gravity and out of it. It thus helps improve the pumping device's idling. This also leads to improved hygienic conditions within the pumping device.

[0056] According to a further embodiment, the pump inlet is designed rotationally symmetrically to the central axis and oriented along the central axis. It is preferably arranged centrally in the bottom region of the housing of the pump device according to the invention.

[0057] In particular, the pump inlet forms the lowest point of the pumping device. This allows the pumping device to be completely emptied of rinsing liquid. A suction port or connecting channel can be connected to the pump inlet, which is in fluid communication with the pump sump of the household dishwasher.

[0058] According to a further embodiment, the housing has a one-piece housing inner part on which the fluid outlets, the first receiving section and the second receiving section are formed.

[0059] In this context, the term "one-piece" or "single-part" means that the housing inner part is not composed of different sub-components, but rather that the fluid outlets, the first receiving section, and the second receiving section form a common component, namely the housing inner part. In particular, the housing inner part can be manufactured "in one piece." This means that the housing inner part is made entirely of the same base material. For example, the housing inner part is made of plastic. The housing inner part can be a plastic injection-molded component. It can be manufactured, in particular, from the same material using a 1K (one-component) plastic injection molding process, or from two different plastics using a 2K (two-component) plastic injection molding process, in one piece, i.e., as a single component.Accordingly, the housing lower part and / or the housing upper part can also be integral components, particularly made of a single material. The housing inner part can be part of the water diverter, at least in sections.

[0060] According to an advantageous development, this one-piece housing inner part can be guided through the central opening of the water diverter element, in particular through the central opening of its annular disc and through the central opening of its drive ring, during assembly of the pump device according to the invention. According to an advantageous development, the housing inner part pre-equipped with the stator and the rotor as well as the impeller can be brought, in particular moved, along the central axis, preferably from above, into the first pre-assembled structural unit formed by the housing lower part and housing upper part and the tubular heating element arranged between them as a second pre-assembled or prepared structural unit, at least for the most part. These two structural units are then preferably mechanically fastened to one another in a releasable manner, such as, for example,by locking, screwing, etc. In this way, the assembly and disassembly of the pump device according to the invention is facilitated.

[0061] If necessary, only the housing base and the tubular heating element can be provided as the first preassembled unit, while the housing top is omitted. The function of the housing top can instead be implemented on the housing inner part. In particular, the housing top can be integrally molded onto the housing inner part and together with it form the second preassembled unit, while the first preassembled unit is then formed by the housing base and the tubular heating element.

[0062] It may be expedient if the water diverter element, in particular the annular disc, is guided on the inside at its, in particular its, central opening by means of guide sections in such a way that it, in particular it, is rotatably mounted about the central axis on the outer circumference of the cylindrical, in particular circular-cylindrical, at least approximately vertical wall section of the second receiving section. The number of guide sections is arbitrary. However, it is particularly preferred to provide three guide sections which are evenly distributed in the circumferential direction around the central axis, i.e. are arranged offset from one another by approximately 120° in the circumferential direction. The guide sections can in particular be part of the inner part of the housing. In particular, they can be provided so as to project radially outwards on the at least approximately vertically extending, cylindrical, in particular circular-cylindrical, outer casing of the second receiving section.

[0063] Alternatively, it may also be expedient if the guide sections are attached, in particular formed, in the area of ​​the inner edge of the annular disc.

[0064] Instead of spaced-apart guide sections, a continuous annular guide section, in particular at least approximately circular when viewed in a sectional plane perpendicular to the central axis, can also be provided, in particular formed, preferably on the housing inner part, in particular on the at least approximately vertical wall section of the second receiving section, or on the inner edge of the annular disc, where it preferably projects downwards into the upper region of the pressure and / or diffuser chamber. It preferably fills a 90° corner region in the upper region of the pressure and / or diffuser chamber between the approximately circular-cylindrical, at least approximately vertically projecting part of the second

[0065] receiving section and the end plate and / or between the approximately circular-cylindrical, at least approximately vertically projecting part of the second

[0066] receiving section and the circular disk arranged at least approximately in a horizontal plane. In particular, it has an upwardly directed, inclined flow surface for the air conveyed from bottom to top.

[0067] Flushing liquid flow is generated so that it is directed towards the locations of the openings in the annular disc that can be supplied with flushing liquid and which are arranged radially further outwards than the inner edge of the annular disc.

[0068] According to a further advantageous development of the invention, when the feed pump of the pumping device is switched on, the flushing fluid, which is pumped from bottom to top, rotates in a preferred direction of rotation in the end region of the pressure and / or diffuser chamber. In order to be able to flow flushing fluid to a specific fluid outlet, the annular disc of the water diverter element is rotated such that one of its apertures is positioned in front of the inlet opening of the fluid outlet to which flushing fluid is to flow, thus exposing the inlet opening.The respective fluid outlet is expediently designed such that, viewed in the preferred direction of rotation, its inlet section has a larger bend radius at an upstream boundary wall region along which the rotational flow exhibiting the preferred direction of rotation first enters the inlet opening of the fluid outlet than a downstream boundary wall region viewed in the preferred direction of rotation. This allows the flushing fluid flow arriving in the preferred direction of rotation to better conform to the boundary wall region of the transition section, which has a larger bend radius. Separation of the flushing fluid flow from this boundary wall region and / or reflections of the flushing fluid flow at this boundary wall region, as well as the associated turbulence, are thus largely avoided.By designing the upwardly directed, rounded flank of the inlet section, along which the rotational flow having the preferred direction of rotation first runs, expediently flatter than the opposite flank of the inlet section downstream in the circumferential direction, an asymmetrical inlet funnel is provided for the flushing fluid flow arriving in the preferred direction of rotation, which largely or almost completely captures or receives it and feeds it into the connecting section of the fluid outlet arranged downstream of the inlet section. Viewed differently, according to an advantageous development, a steeper, rounded, upwardly directed boundary wall region of the inlet section is located opposite the flatter, rounded boundary wall region of the inlet section in the preferred direction of rotation, spaced by the width of the asymmetric inlet opening of the inlet section.The latter has a smaller radius of curvature than the boundary wall area of ​​the inlet section, along which the rotating flow of the rinsing liquid arriving in the preferred direction of rotation first flows and enters the connecting section of the fluid outlet arranged downstream of the inlet section. The inlet section of the fluid outlet thus has an inlet zone in its inlet area that is more strongly widened on one side, where the liquid flow rotating in the preferred direction of rotation enters first, while the opposite inlet zone of the inlet section, spaced apart from it in the preferred direction of rotation, is less widened. The latter can, in particular, introduce any residual flow of the rinsing liquid circulating counter to the preferred direction of rotation into the inlet opening of the fluid outlet.It can be particularly expedient if the contour of the boundary wall of the respective opening of the water switch element which is subjected to flushing liquid, in particular its annular disc which is arranged upstream in front of the end plate of the inner housing part, continues the contour of the inlet section of the respective fluid outlet upstream, so that a smooth transition for the flushing liquid arriving in the upper end section of the pressure and / or diffuser chamber with a preferred direction of rotation into the fluid outlet is ensured. In other words, a flow separation of the flushing liquid flow when the flushing liquid flows over from the upper end section of the pressure and / or diffuser chamber via the respective opening of the.

[0069] Water diverter element, especially its circular disc, in the

[0070] The fluid outlet through which the flushing fluid flows is largely eliminated. This reduces the hydraulic resistance of the pumping device and improves its hydraulic efficiency.

[0071] According to an advantageous development, the outer diameter of the stator of the water diverter drive is selected to be equal to or smaller than the inner diameter of the central recess or the central cutout of the stator of the drive motor of the feed pump of the pumping device. This dimensioning specification allows the stator lamination, in particular the stator lamination stack, of the water diverter drive and the stator lamination, in particular the stator lamination stack, of the drive motor of the feed pump of the pumping device to be manufactured from a common, i.e., one and the same, blank, in particular to be punched out of it. This reduces the waste of stator lamination material.

[0072] Generally speaking, the geometric shape of a first stator lamination, in particular a stator lamination stack, for the stator of a first drive motor and, at the same time, the geometric shape of a second stator lamination, in particular a stator lamination stack, with a smaller diameter, for the stator of a second drive motor can be machined from one and the same blank, particularly by punching. This is both cost-effective in terms of production and minimizes waste.

[0073] The first stator lamination, in particular stator lamination stack, expediently has a circumferential ring section, in particular a circular ring section, from which a plurality of root sections or teeth extend radially inwards. The teeth are preferably evenly distributed around the circumference of the ring section, i.e. two adjacent teeth in the circumferential direction have the same circumferential angular offset from one another. Between each two adjacent teeth there is therefore in particular a groove that is open radially inwards. Each of the teeth can preferably have the turns of an electrical coil wound around it in a winding process carried out at a later time in order to produce the stator of the first drive motor. At the root sections or teeth, the first stator lamination, in particular stator lamination stack, which is provided for the stator of the first drive motor, has a predetermined inner diameter.The second stator lamination, in particular stator lamination stack, expediently also has, as its geometric shape, a circumferential ring section, in particular a circular ring section, from which a plurality of root sections or teeth extend radially inward. The teeth are preferably evenly distributed around the circumference of the ring section, i.e., two adjacent teeth in the circumferential direction have the same circumferential angular offset from one another. Thus, between each two adjacent teeth, there is in particular a groove open radially inward. Each of the teeth can preferably be wound with the turns of an electrical coil in a winding process carried out later in order to produce the stator of the second drive motor.The annular portion of the second stator lamination, in particular the stator lamination stack, has an outer diameter that is equal to or smaller than the inner diameter of the first stator lamination, in particular the stator lamination stack, so that the second stator lamination, in particular the stator lamination stack, is arranged within the first stator lamination, in particular the stator lamination stack, when machined from the blank. In other words, the size ratios of the first stator lamination, in particular the stator lamination stack, and the second stator lamination, in particular the stator lamination stack, are such that the first stator lamination, in particular the stator lamination stack, for the stator of the first drive motor essentially concentrically surrounds the second stator lamination, in particular the stator lamination stack, for the stator of the second drive motor when they are machined from the blank or, for comparison, are placed one inside the other in a common plane in the most space-saving manner possible.

[0074] According to an alternative development of the invention, the housing can have a housing outer part, in particular a one-piece or single-piece housing outer part, which delimits the liquid conveying channel, which is at least almost rotationally symmetrical to the central axis, to the outside, in particular up to the fluid outlets, wherein at least one tubular heater is accommodated in the liquid conveying channel. This can further simplify the structure or design of the pumping device according to the invention. It may already be sufficient if the housing of the pumping device consists of only two parts - the housing outer part and the housing inner part. At most, a cover part can also be provided, with which the upper opening of the housing inner part can be closed. This allows the stator accommodated in the housing inner part between its first receiving section and second receiving section to be reliably protected against moisture and / or rinsing fluid.The outer housing part and the inner housing part inserted into or immersed in it can be mechanically connected to each other, for example, by a snap-in, locking, and / or bayonet connection and / or other coupling. The fact that at least one tubular heating element is housed in the fluid conveying channel formed between the inner housing part and the outer housing part also improves heat transfer between the tubular heating element and the flushing fluid conveyed from bottom to top through the fluid conveying channel by means of the impeller or pump wheel of the pumping device.

[0075] In particular, the second receiving section forms at least a partial section of the inner boundary wall of the liquid conveying channel.

[0076] The tubular heater is expediently provided downstream of the impeller of the pumping device in the fluid conveying channel along its flow path, in particular arranged at least virtually rotationally symmetrically to the central axis, preferably at least virtually concentrically to the second receiving section. It is expediently arranged symmetrically with respect to the central axis of the preferably circular-cylindrical fluid conveying channel such that, viewed in the respective passage cross-sectional plane of the fluid conveying channel, at least approximately the same gap width results between the tubular heater and the inner boundary wall of the fluid conveying channel formed by the inner housing part, as well as between the tubular heater and the outer boundary wall of the fluid conveying channel formed by the outer housing part, for the rinsing fluid flowing through there.This allows the tubular heater to be supplied with a largely uniform flow of the pumped flushing liquid, which is beneficial for the transfer of heat from the tubular heater to the flushing liquid flowing past it.

[0077] In particular, it may be sufficient and / or advantageous if the tubular heater is accommodated in the liquid conveying channel with only approximately one turn or partial turn section and runs around the central axis, preferably around the second receiving section of the housing inner part. In this way, impairments of the flow conditions caused by the tubular heater in the liquid conveying channel can be minimized or largely avoided. In this regard and / or also from a structural point of view, it may be particularly advantageous if the turn or partial turn section of the tubular heater is arranged at least approximately horizontally or in a plane orthogonal to the central axis. However, it is also possible for the tubular heater to run around the central axis in the liquid conveying channel with more than one turn, e.g. if a higher heat transfer to the rinsing liquid is required.

[0078] Furthermore, the invention can also relate to the pumping device described above for a liquid-conducting, in particular water-conducting, household appliance, in particular a household dishwasher. It can also be provided, for example, for a washing machine, a tumble dryer, or a washer-dryer.

[0079] The invention therefore also relates, quite generally, to a water-conveying pumping device for a water-conducting household appliance, in particular for a household dishwasher as described above and / or configured according to claims 1 to 24, according to claim 25. Such a pumping device according to the invention can be implemented in particular in washing machines, tumble dryers, or other water-conducting household appliances. It can be configured, in particular, as described above and / or according to claims 1 to 24.

[0080] Other advantageous developments of the invention are set forth in the dependent claims. The advantageous developments and refinements of the invention explained above and / or set forth in the dependent claims can be applied individually or in any combination with one another - except, for example, in cases of clear dependencies or incompatible alternatives.

[0081] The invention and its advantageous developments and further developments as well as their advantages are explained in more detail below with reference to drawings.

[0082] They show, in a schematic principle sketch:

[0083] Figure 1 is a schematic perspective view of an advantageous embodiment of a household dishwasher designed according to the invention,

[0084] Figure 2 is a schematic sectional view of the household dishwasher according to Fig. 1 with its hydraulic circuit,

[0085] Figure 3 is a schematic sectional view of an advantageous embodiment of a pumping device of the hydraulic circuit of the household dishwasher according to Figures 1 and 2,

[0086] Figure 4 is a schematic plan view of the pumping device according to Fig. 3,

[0087] Figure 5 is a schematic plan view of an advantageous embodiment of a water diverter element for the pumping device according to Figure 3,

[0088] Figure 6 is a schematic sectional view of the water diverter element according to Figure 5,

[0089] Figure 7 is a schematic perspective exploded view of the water diverter element according to Figures 5 and 6, which comprises a circular disc and a drive ring for rotating the circular disc, Figure 8 is a schematic perspective view of an embodiment of the drive ring of the water diverter element according to Figures 5 to 7,

[0090] Figure 9 is a schematic sectional view of an advantageous embodiment of a water diverter for the pumping device according to Figure 3, which comprises the drive ring of the water diverter element of Figures 5 - 7 in an annular groove and a water diverter drive, wherein the annular disc is omitted,

[0091] Figure 10 is a schematic sectional view of an advantageous embodiment of a fluid outlet for the pumping device according to Figure 3,

[0092] Figure 11 is a schematic plan view of an advantageous embodiment of a sealing device between the housing lower part and the tubular heating element of the pumping device according to Figure 3

[0093] Figure 12 is a schematic sectional view of the sealing device according to Figure 11 in a section along its diameter in a sectional plane perpendicular to the image plane of Figure 11,

[0094] Figure 13 is a schematic plan view of an embodiment of a blank for producing the stator lamination, in particular the stator lamination stack, of the drive motor of the feed pump of the pumping device of Figure 3 and the stator lamination, in particular the stator lamination stack, of the water switch drive of the pumping device according to Figure 3;

[0095] Figure 14 shows an embodiment of an arrangement from the blank according to Figure 13, which provides the punched-out stator sheet, in particular stator sheet stack, of the drive motor of the feed pump of the pumping device of Figure 3 and at the same time the punched-out stator sheet, in particular stator sheet stack, of the water switch drive of the pumping device of Figure 3, and

[0096] Figure 15 is a schematic sectional view of a variant of a pumping device in the hydraulic circuit of the household dishwasher according to Figures 1 and 2, which variant is modified compared to the advantageous embodiment of Figure 3,

[0097] In the figures, elements that are identical or have the same function or effect are provided with the same reference symbols, unless otherwise stated.

[0098] Figure 1 shows a schematic perspective view of an embodiment of a household dishwasher 1 with a pumping device 19 constructed according to the inventive principle. Such a pumping device can, in principle, also be implemented in another water-conducting household appliance, such as a washing machine or a washer-dryer.

[0099] Figure 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a washing compartment 2, which can be closed, in particular watertight, by a (front) door 3. For this purpose, a sealing device can be provided between the door 3 and the washing compartment 2. The washing compartment 2 is preferably cuboid-shaped. The washing compartment 2 can be arranged in a housing of the household dishwasher 1. The washing compartment 2 and the door 3 can form a washing chamber 4 for washing dishes when the door is brought into its preferably at least approximately vertical closing end position.

[0100] The door 3 is shown in Figure 1 in its open, at least approximately horizontal, end-of-opening position. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at a lower end of the door 3. A front loading opening 6 of the washing compartment 2 can be closed or opened with the aid of the front door 3. The washing compartment 2 has a bottom wall 7, a top wall 8 arranged opposite the bottom wall 7, a rear wall 9 arranged opposite the closed front door 3, and two side walls 10, 11 arranged opposite one another. The bottom wall 7, the top wall 8, the rear wall 9, and the side walls 10, 11 can be made, for example, from a stainless steel sheet. Alternatively, the bottom wall 7 can be made, for example, from a plastic material. The household dishwasher 1 further has at least one dishware holder 12 to 14.Preferably, several, for example three, dishware receptacles 12 to 14 can be provided, wherein the dishware receptacle 12 can be a lower dishware receptacle or a lower basket, the dishware receptacle 13 can be an upper dishware receptacle or an upper basket, and the dishware receptacle 14 can be a cutlery drawer above the upper dishware receptacle or the upper basket. As Figure 1 further shows, the dishware receptacles 12 to 14 are arranged one above the other in the washing container 2. Each dishware receptacle 12 to 14 can be selectively moved into or out of the washing container 2. In particular, each dishware receptacle 12 to 14 can be pushed or moved into the washing container 2 in an insertion direction E and pulled or moved out of the washing container 2 in a pull-out direction A opposite to the insertion direction E.

[0101] Figure 2 shows a highly schematic sectional view of the household dishwasher 1 with its hydraulic circuit or circulation circuit. In addition to the washing tub 2, the household dishwasher 1 comprises a base support 15, which supports the washing tub 2 above it. The base support 15 is, for example, a plastic component, in particular an injection-molded plastic component.

[0102] A pump sump 16 is provided on the bottom wall 7. The pump sump 16 is cup-shaped and, in the orientation shown in Fig. 2, extends downwards from the bottom wall 7. The pump sump 16 is thus located lower than the bottom wall 7 of the washing container 2, so that washing liquid can collect in it during the washing operation of the household dishwasher, flowing from above into its collection opening. The pump sump 16 can be a plastic component, in particular an injection-molded plastic component. The cup-shaped pump sump 16 has an outlet opening 17 in a wall, in particular an upright wall, or in its bottom wall. In this exemplary embodiment, a tubular drain 17' preferably opens out of the pump sump 16. This drain can also be omitted if necessary. The pump sump 16 is equipped with a sieve system 18.This can, in particular, comprise a surface filter that at least partially or completely covers the upper opening of the pump sump from above on the wash chamber side. It can, in particular, form a partial surface of the bottom of the wash tub, preferably being arranged substantially flush with the bottom wall 7. In addition to or independently of the surface filter, the sieve system 18 can comprise a coarse filter and a fine filter.

[0103] A pumping device 19 is connected to the outlet opening 17 or to the drain 17'. The pumping device 19 is designed to circulate rinsing liquid F, i.e. rinsing solution and / or fresh water. For this purpose, it comprises a circulating pump or feed pump for conveying rinsing liquid F. Furthermore, the pumping device 19 is also designed to introduce heat into the rinsing liquid F. For this purpose, it has a heater for heating the rinsing liquid F conveyed by the feed pump. It is thus designed as a heating pump and can therefore also be referred to as such. The pumping device 19 is particularly preferably a compact heating pump and can therefore also be referred to as such. The pumping device 19 can be attached to the pump sump 16 and / or to the bottom wall 7 of the washing container 2.The pumping device 19 is preferably arranged completely or at least partially below the bottom wall 7 and / or the screening system 18 of the pump sump 16.

[0104] The pumping device 19 is constructed essentially rotationally symmetrically to a symmetry or central axis 20. The central axis 20 is oriented parallel to a direction of gravity g. The pumping device 19 has a (feed) pump 21, which is in fluid communication with the outlet opening 17 or the drain 17' of the pump sump 16 by means of an intake port 22, so that the pumping device 19 can suck in rinsing liquid F from the pump sump 16 via the intake port 22 and the outlet opening 17, or as here in the embodiment of Figure 2, via the intake port 22 and the drain 17. Generally speaking, the pumping device 19 is in fluid communication with the outlet opening 17 of the pump sump 16, preferably via a connecting channel.

[0105] In addition to the pump 21, the pumping device 19 has a water diverter 23 integrated into the pumping device 19. With the aid of the water diverter 23, it is possible to selectively distribute the rinsing liquid F conveyed by the feed pump 21 of the pumping device 19 to different spray devices 24, 25, 26 and / or other liquid application units provided in the rinsing container 2. With the aid of the water diverter 23, the spray devices 24, 25, 26 can be selectively supplied with rinsing liquid F, in particular rinsing liquor and / or fresh water, or not. Optionally means in particular that either the respective spray device and / or liquid application unit can be selectively supplied with rinsing liquid or not, or that several spray devices and / or liquid application units can be supplied with rinsing liquid simultaneously or not.

[0106] The spray devices 24, 25 can preferably be rotatable spray arms, whereas the spray device 26 can in particular be a rotatable roof gyroscope or a fixed roof shower. In addition, switchable intensive spray zones, such as on and / or in the dishware receptacles or a screen cleaning nozzle (not shown), can be provided. For example, the lower spray device 24 is mounted below the dishware receptacle 12, in particular below the lower basket, so as to be rotatable about an axis of rotation 27 on the floor 7, on the pump sump 16 or on the pump device 19. The spray device 24 has spray nozzles which spray the washing liquid F, in particular washing liquor and / or fresh water, upwards into the dishware receptacle 12 in the orientation of Figure 2.

[0107] The upper spray device 25 can be mounted on the dishware holder 13, in particular the upper basket, so as to be rotatable about a rotation axis 28. The upper spray device 25 also has spray nozzles designed to spray the rinsing liquid F downwards and / or upwards in the orientation shown in Figure 2. The spray device 26, in particular a roof rotor, can be mounted on the ceiling 8 of the washing container 2 so as to be rotatable about a rotation axis 29. The spray device 26 applies rinsing liquid F to the dishware holder 14, in particular a cutlery basket, and the dishware holders 12, 13 located therebelow, in the orientation shown in Figure 2, from top to bottom.

[0108] The lower spray device 24 is fluidly connected to the pumping device 19, in particular to the water diverter 23, by means of a supply line 30. The pumping device 19 can supply the spray device 24 with rinsing fluid via the supply line 30.

[0109] The upper spray device 25 is assigned a supply line 31, which fluidically connects the spray device 25 to the pump device 19. The pump device 19 can supply the spray device 25 with rinsing fluid F via the supply line 31.

[0110] The uppermost spray device 26 is assigned a supply line 32, which fluidically connects the spray device 26 to the pump device 19. The pump device 19 can supply the spray device 26 with rinsing fluid F via the supply line 32.

[0111] Each spray device 24, 25, 26 can be assigned its own supply line 30, 31, 32. Alternatively, all or several of the spray devices 24, 25, 26 can have a common supply line that branches out. In particular, several of the or all of the supply lines 30, 31, 32 can be formed by a common component, in particular by a common plastic injection-molded component. In particular, the supply lines 31, 32 to the upper spray devices 25, 26 are guided along the rear wall 9 from the base wall 7 in the direction of the ceiling wall 8. The supply lines 30, 31, 32 or at least some of the supply lines 30, 31, 32, for example 31, 32, can be guided through the sieve system 18 and / or the base wall 7.

[0112] The pumping device 19 preferably has a separate connection or fluid outlet for each supply line 30, 31, 32. The pumping device 19, the spraying devices 24, 25, 26 and their associated supply lines 30, 31, 32, as well as the washing chamber, which is defined by the walls of the washing container 2 and the front door 3 closing its front loading opening, together form the hydraulic circuit or circulation circuit 33 of the household dishwasher 1. The pumping device 19 circulates the washing liquid F in this hydraulic circuit 33.

[0113] The household dishwasher 1 further comprises at least one regulating and / or control device 34. With the aid of the regulating and / or control device 34, for example, different washing programs of the household dishwasher 1 can be carried out. For this purpose, washing programs can be stored or saved in the regulating and / or control device 34. The regulating and / or control device 34 is preferably arranged outside the washing compartment 2. One or more components of the regulating and / or control device 34 can be arranged in particular in or on the door 3. They can preferably be provided on an upper edge of the door 3 (not shown). The regulating and / or control device 34 or one or more components thereof can, however, also be accommodated in the base support 15. The regulating and / or control device 34 can be operated or actuated using operating elements (not shown).The control elements may include, for example, buttons, knobs, and / or touchscreens. These may be mounted on door 3.

[0114] The pumping device 19 can be controlled by means of the regulating and / or control device 34. For example, the feed pump 21 can be switched on and off and / or its speed can be changed by means of the regulating and / or control device 34. The regulating and / or control device 34 can receive and evaluate information from the pumping device 19, such as the speed of the feed pump 21 and / or a motor current of the feed pump 21. Furthermore, the regulating and / or control device 34 can also control the water diverter 23 in order to selectively switch on or off the spray devices 24, 25, 26 and / or other liquid application units.

[0115] Dishware G to be cleaned is arranged in the washing container 2. The dishware G can include, for example, glasses, plates, pots, bowls, cutlery, or the like. In particular, the dishware G is accommodated in the dishware receptacles 12, 13, 14 not shown in Figure 2. The dishware G can be exposed to rinsing liquid F using the spray devices 24, 25, 26 and / or other liquid application units not shown in Figure 2.

[0116] Figure 3 shows a schematic sectional view of an embodiment of a pumping device 19 as mentioned above. The pumping device 19 is assigned an axial direction AX which, in the orientation of Figure 3, extends from bottom to top, in particular at least approximately in the vertical direction. The axial direction AX coincides with the central axis 20 or is oriented parallel to it. Furthermore, the pumping device 19 is assigned a radial direction R. The radial direction R is oriented perpendicular to the central axis 20 and away from it. The axial direction AX and the radial direction R are thus oriented perpendicular to one another. As mentioned above, the pumping device 19 has the feed pump 21 and the water diverter 23. The pumping device 19 differs from the feed pump 21 in that the pumping device 19 also has the water diverter 23 in addition to the feed pump 21.

[0117] The pump device 19 comprises a housing 35 with a lower housing part 36, an upper housing part 37, and an inner housing part 38. The lower housing part 36 has a pump inlet 39, to which the intake nozzle 22 connected to the outlet nozzle 17' of the pump sump 16 or, more generally, the connecting channel fluidically connected to the outlet opening 17 of the pump sump 16 is connected. For example, the intake nozzle 22 is mounted on the pump inlet 39 and sealed therefrom by means of a sealing element, for example in the form of an O-ring. The housing 35 is constructed essentially rotationally symmetrically to the central axis 20. The pump inlet 39 is preferably arranged in the bottom, in particular centrally in the bottom, of the housing 35, in particular in the bottom wall of the lower housing part 36. It is preferably located at the lowest point of the pump device 19.In particular, it can be designed as an intake opening whose cross-sectional area widens in the direction of flow. It is preferably rotationally symmetrical. Its axis of symmetry preferably runs along the central axis 20, in particular, it coincides with it.

[0118] A tubular heating element 40 is placed between the lower housing part 36 and the upper housing part 37. In particular, the tubular heating element 40 can be held between the lower housing part 36 and the upper housing part 37. The tubular heating element 40 can preferably be a thick-film heating element. It is tubular or hollow-cylindrical. It is arranged and designed, i.e. constructed, rotationally symmetrical to the central axis 20. The tubular heating element 40 can expediently be sealed with respect to the lower housing part 36 and the upper housing part 37 by means of sealing elements, for example in the form of O-rings. During operation of the pump device 19, the rinsing liquid F flows along the inside of the tubular heating element 40. The lower housing part 36 and the upper housing part 37 are preferably connected to one another in a form-fitting manner (not shown).For this purpose, one or more locking hooks, snap hooks, screw connections, or the like can be provided, which enable a positive-locking connection of the lower housing part 36 to the upper housing part 37. A positive-locking connection is created by two connecting partners engaging with one another or behind one another, in this case the lower housing part 36 and the upper housing part 37. The housing inner part 38 is positively connected to the upper housing part 37. One or more corresponding locking hooks, snap hooks, screw connections, or the like are also provided for this purpose. In particular, the housing inner part 38 and the upper housing part can be coupled to one another by a bayonet lock. The housing lower part 36, the upper housing part 37, and the housing inner part 38 are plastic components, in particular plastic injection-molded components.

[0119] The lower housing part 36 accommodates an impeller 41, which is arranged downstream of the pump inlet 39 in a pump chamber or pump space, i.e. in an impeller space 119. The impeller space 119 is arranged and designed rotationally symmetrical to the central axis 20 and extends radially outwards from the central axis 20 to the side wall of the lower housing part 36. The impeller 41 is driven by a drive motor 42. The drive motor 42 is an electric motor. The impeller 41 can also be referred to as an impeller. The drive motor 42 comprises a drive shaft 43 which is connected in a rotationally fixed manner to the impeller 41 and which rotates about the central axis 20 as the axis of rotation during operation of the pump device 19. In addition to the impeller 41, a rotor 44 of the drive motor 42 is connected in a rotationally fixed manner to the drive shaft 43.

[0120] The rotor 44 is rotatably mounted about the central axis 20 in a cup-shaped first receiving section 45 of the housing inner part 38. The first receiving section 45 encloses a receiving space 46 in which the rotor 44 is received. The first receiving section 45 is closed with a closure 47 in the orientation shown in Figure 3 downwards, i.e. in the direction of the impeller 41. The drive shaft 43 is guided centrally through the closure 47 and can be mounted thereon. The receiving space 46 can be filled with rinsing liquid F, i.e. rinsing solution and / or fresh water. For this purpose, the receiving space 46 of the first receiving section 45 can be fluidically connected to the impeller space 119 by targeted leak points. For example, one or more small through-openings and / or one or more channels in the drive shaft 43 can be provided in the closure 47; these channels have been omitted here in the exemplary embodiment shown in Figure 3 for the sake of clarity.In this way, the drive motor 42 for the impeller 41 is designed as a so-called wet-running motor. In addition to the first receiving section 45, the housing inner part 38 comprises a second receiving section 48. The second receiving section 48 is also pot-shaped. However, in contrast to the first receiving section 45, the second receiving section 48, in the orientation of Fig. 3, is open not on the bottom but on the top. The first receiving section 45 is arranged within the second receiving section 48. The second receiving section 48 thus has a larger diameter than the first receiving section 45. It preferably surrounds the first receiving section 45 concentrically with a gap 120 that is annular, in particular circular, when viewed in cross-section (section plane perpendicular to the central axis 20).From a spatial perspective, this gap space 120 is formed in the shape of a circular ring cylinder between the first receiving section 45 arranged radially inward and the second receiving section 48 arranged concentrically with respect to the first receiving section 45 and further outward at a predetermined radial distance.

[0121] Thus, a receiving space 49, which is annular, in particular circular, when viewed in cross-section, is provided between the first receiving section 45 and the second receiving section 48. The stator 50 of the drive motor 42 is arranged in the receiving space 49. The stator 50 can be glued to the first receiving section 45 and / or the second receiving section 48, for example, or can be held there in the receiving space 49 in some other way.

[0122] The feed pump 21 is formed in particular by the drive motor 42, the impeller 41, and at least parts of the housing 35. The tubular heating element 40 can also be part of the pump 21. In particular, the two receiving sections 45, 48 of the housing inner part 38 are part of the feed pump 21. In contrast, the pump device 19 also has the water diverter 23 in addition to the feed pump 21.

[0123] Figure 4 shows a schematic plan view of the pump device 19. The housing inner part 38 has a plurality of fluid outlets, such as 51, 53, 54, to which the supply lines, such as 30, 31, 32, are connected downstream. If three spray devices, such as 24, 25, 26, are provided, preferably exactly three fluid outlets, such as 51, 53, 54, can be provided. If, for example, four spray devices are provided, correspondingly four fluid outlets, such as 51, 52, 53, 54, can expediently be provided.

[0124] In the present exemplary embodiment, the fluid outlet 51 is assigned to the spray device 24. If necessary, the fluid outlet 51 can simultaneously function as a bearing for the spray device 24. The fluid outlet 52 is, in particular, an additional outlet, which can, for example, be assigned to an intensive spray zone (not shown). For example, an additional fluid outlet—such as the fluid outlet 52 in the exemplary embodiment in Figure 4—can be provided, which leads via a supply line to a special spray zone. The fluid outlet 53 is assigned to the spray device 26, and the fluid outlet 54 is assigned to the spray device 25. However, the assignments between the fluid outlets and the spray devices and / or other liquid application units can also be selected differently.

[0125] The fluid outlets 51, 52, 53, 54 are tubular and extend along the central axis 20 or along the axial direction AX at least approximately vertically from bottom to top. Preferably, they project upwards from

[0126] The inner housing part 38. The fluid outlets 51, 52, 53, 54 can each have a circular or an elliptical or oval cross-section or

[0127] Have a cross-section shaped like a circular ring. During operation of the pumping device 19, the rinsing solution and / or the fresh water F can be discharged via the fluid outlets 51, 52, 53, 54.

[0128] The fluid outlets 51, 52, 53, 54 extend at least approximately vertically upwards from a closure plate 55 of the housing inner part 38, which closes off the front of the housing upper part 37. In the present exemplary embodiment, all fluid outlets fluidically connected to the supply lines, such as 30, 31, 32, leading to the spray devices, such as 24, 25, 26, run at least approximately parallel to the central axis 20 of the pump device 19. A tubular or hollow-cylindrical connecting section 56 extends around the peripheral edge of the closure plate 55, by means of which the housing inner part 38 is connected to the housing upper part 37.

[0129] Now returning to Figure 2, a water diverter element 57 which is rotatable about the central axis 20 is arranged between the housing inner part 38, in particular the end plate 55, and the housing upper part 37 and is also shown in a plan view in Figure 5. Figure 6 shows a schematic sectional view of the water diverter element 57. Figure 7 shows a schematic perspective exploded view of the water diverter element 57. The water diverter element 57 is preferably two-part and has an annular disc 58 and a drive ring 59, which is shown in a separate schematic perspective view in Figure 8.

[0130] The water diverter element 57 is part of the water diverter 23. The water diverter element 57 is arranged and designed rotationally symmetrically to the central axis 20. It has a central breakthrough or a central opening 60. The central breakthrough or the central hole 60 is provided in particular on the annular disc 58. The central breakthrough opening or the hole 60 is preferably circular. Furthermore, the water diverter element 57 has a plurality of breakthroughs or holes penetrating the plate of the annular disc 58, such as 61, 62, 63, with which the fluid outlets such as 51, 52, 53, 54 can be selectively blocked or opened by rotating the annular disc 58. The breakthroughs such as 61, 62, 63 penetrate the annular plate of the annular disc 58 along the central axis 20, in particular at least approximately in the vertical direction. Through the respective breakthrough such as61, the flushing liquid F pumped from bottom to top by the impeller 41 can flow through from bottom to top and into a fluid outlet to be flowed through, i.e. to be supplied with flushing liquid, such as 51, 52, 53, 54, if this opening is brought into position in front of this fluid outlet to be flowed through, such as 51, 52, 53, 54, by corresponding rotation of the annular disc 58 about the central axis 20 (viewed from bottom to top in the axial direction or liquid conveying direction AX), such that it partially or completely releases its inlet opening, such as E51, E52, E53, E54. The openings, such as 61, 62, 63, can be circular or oval. The openings can advantageously also be in the shape of an elongated hole, in particular in the shape of a circular ring section. With the help of the slot-shaped geometry of the respective opening such as 61, 62, 63, it is possible to release several of the fluid outlets such as 51, 52, 53, 54 at the same time.The number of openings can correspond to the number of fluid outlets, such as 51, 53, 54. However, this is not mandatory. With the aid of the water diverter element 57, in particular with the aid of its annular disc 58, the fluid outlets, such as 51, 52, 53, 54, can be combined as desired with respect to their release for the application of flushing fluid or their blocking against the entry and passage of fluid. For example, it is possible to release the fluid outlets 51, 52 and block the fluid outlets 53, 54.

[0131] The housing inner part 38, with its second, pot-shaped receiving section 48 containing the first, pot-shaped receiving section 45, is guided through the central, preferably circular disk-shaped, opening 60 of the annular disc 58. In the assembled state of the pump device 19, the second receiving section 48, with its cylindrical, in particular circular-cylindrical, at least approximately vertical wall section, extends partially or optionally completely through the central, preferably circular disk-shaped, opening 60 of the annular disc 58 from top to bottom against the axial direction AX - as here in the exemplary embodiment of Figure 3.The annular disc 58 expediently encloses with its radially inner edge, which delimits its central opening 60, - as shown here in the embodiment of Figure 3 in the final assembly state of the pump device 19 - the cylindrical, in particular circular-cylindrical, at least approximately vertical wall of the second receiving section 48 of the housing inner part 38. The opening 60 in the center of the annular disc 58 can preferably be selected to be somewhat larger than the outer diameter of the cylindrical, in particular circular-cylindrical, at least approximately vertical wall section of the second receiving section 48.As a result, during assembly of the pump device 19, the housing inner part 38, which is expediently pre-equipped with the stator 50, the rotor 44, the motor shaft 43, the closure 47 (if present), and the impeller 41, can be guided, in particular pushed, through the central opening 60 of the annular disc 58 - preferably from top to bottom - with some play. It may be expedient if the water diverter element 57, in particular the annular disc 58, is guided on the inside at its, in particular its, central opening 60 by means of guide sections such as 64, 65, 66 in such a way that it, in particular it, is rotatably mounted about the central axis 20 on the outer circumference of the cylindrical, in particular circular-cylindrical, at least approximately vertical wall section of the second receiving section 48. These guide sections are indicated by dash-dotted lines in Figure 5. The number of guide sections is arbitrary.Particularly preferably, however, three guide sections 64, 65, 66 can be provided, which are distributed evenly in the circumferential direction around the central axis 20, i.e., are arranged offset from one another by approximately 120° in the circumferential direction. The guide sections 64, 65, 66 can, in particular, be part of the housing inner part 38. In particular, they can be provided on the at least approximately vertically extending, cylindrical, in particular circular-cylindrical, outer shell of the second receiving section 48, projecting radially outward.

[0132] Alternatively, it may also be expedient if the guide sections are attached, in particular formed, in the region of the inner edge of the annular disc 58.

[0133] Instead of spaced-apart guide sections such as 64, 65, 66, a continuous annular, in particular at least approximately circular, guide section (not shown) can also be provided, preferably on the housing inner part 38, in particular on the at least approximately vertical wall section of the second receiving section 48 or on the inner edge of the circular disc. In Figure 3, a guide section UL is indicated by dotted lines, which is additionally attached, in particular molded, to the inner edge of the circular disc 58 and projects downwards. It is spatially circular in shape.It fills a 90° corner area in the upper area of ​​the pressure and / or diffuser chamber 92 between the approximately circular-cylindrical, at least approximately vertically projecting part of the second receiving section 48 and the end plate 55 and / or between the approximately circular-cylindrical, at least approximately vertically projecting part of the second receiving section 48 and the annular disc 58 arranged at least approximately in a horizontal plane. In particular, it has an upwardly directed inclined flow surface for the flushing liquid flow conveyed from bottom to top, so that this is directed in the direction of the locations of the openings to which flushing liquid F can be applied, such as 61, 62, 63, which are arranged radially further outwards than the inner edge of the annular disc.

[0134] The drive ring 59 is expediently coupled to the annular disc 58 in a force-transmitting manner for the rotation of the latter in its respective direction of rotation. In order to establish a force-transmitting coupling or connection between the drive ring 59 and the annular disc 58 when the drive ring 59 rotates in its respective direction of rotation, the drive ring 59 preferably has, in this exemplary embodiment (see Figures 5 - 8), one or more drivers such as 73, 74, 75 extending from the top of an upwardly facing end face of the drive ring 59. The one or more drivers are particularly designed to engage in recesses assigned to them on the annular disc 58, such as 67, 68, 69, which can be provided in particular on the outer edge, so that the drive ring 59 is coupled to the annular disc 58 in a force-transmitting manner in its respective direction of rotation.The recesses on the annular disc 58 for engaging the drivers of the drive ring 59 can be through-holes, in particular from bottom to top, preferably perpendicular to the plane of the annular disc 58, or else blind holes, which are provided in the underside of the annular disc 58 associated with the top side of the drive ring 59.

[0135] In particular, the drivers of the drive ring 59 are seated in their associated recesses of the annular disc 58 with play such that, during pumping operation of the pump device 19, the annular disc 58 can be pushed upwards and floated by the flushing fluid F conveyed from bottom to top until it is pressed in the pressure / diffuser chamber 92 against a preferably flat end plate 55 of the housing inner part 38 or against at least one limiting element projecting downwards on the underside of the end plate, in order to reliably seal fluid outlets such as 51, 52, 53, 54 that are to be closed. However, the respective driver, such as 73, 74, 75, remains engaged with its associated recess, such as 67, 68, 69, of the annular disc 58.For this purpose, it rests, in particular, overlapping a partial length of the boundary wall of the recess assigned to it, toward which it converges when the drive ring 59 is driven to rotate in its respective direction of rotation. It can be particularly advantageous if, as in the exemplary embodiment here (see Figures 5-8), the circular disc 58 has outer, open-edged openings as recesses, facing away from the central opening 60. In this exemplary embodiment, preferably exactly three recesses 67, 68, 69 are provided.

[0136] The drive ring 59 has an annular base section 70, in particular a circular-cylindrical base section of low height. A circumferential toothing 71, in particular a helical toothing, is attached to the outside of the base section 70. It is designed in particular as an annular gear ring. Drivers such as 73, 74, 75 extend from an end face 72 of the base section 70, which end face is directed upwards in the orientation of Figure 8. The drivers such as 73, 74, 75 are designed to engage in their associated recesses such as 67, 68, 69 in the annular disc 58 in such a way that the drive ring 59 drives the annular disc 58 in its respective direction of rotation. The drivers such as 73, 74, 75 as well as the corresponding recesses such as 67, 68, 69 are preferably uneven around the central axis 20, iein the circumferential direction, distributed so that when the circular ring disc 58 and the drive ring 59 are assembled, a coding is realized which prevents faulty assembly (Poka Yoke).

[0137] Viewed along the central axis 20 or the axial direction AX, the annular disc 58 can be lifted vertically upwards from the drive ring 59, so that the annular disc 58 can float on the flushing liquid F conveyed from bottom to top by means of the rotating impeller 41 during operation of the pump device 19. However, the force-transmitting coupling between the annular disc 58 and the drive ring 59 for rotating the annular disc by means of the drive ring in its respective direction of rotation is always maintained. The annular disc 58 remains coupled to the drive ring 59 in the circumferential direction even when it floats upwards on the flushing liquid flowing towards it from below, which is conveyed upwards by the rotating impeller 41 during conveying operation of the pump device 19.As a result, the annular disc can be rotated into a desired rotational position in the circumferential direction during delivery operation of the feed pump 21 by rotating the drive ring 59 by means of the water diverter drive 76. Preferably, the respective driver such as 73, 74, 75 protrudes from the top side of the drive ring 59 in the vertical or axial direction (along the central axis 20) with a vertical extension that is greater than the maximum intended floating or lifting distance of the annular disc 58 in the vertical direction. This ensures that the respective driver such as 73, 74, 75 of the drive ring 59 in the recess assigned to it, such as 67, 68, 69 of the annular disc 58, always overlaps with a boundary wall of the recess at least over a partial length of its vertical extension.The maximum floating distance corresponds in particular to the free height difference between the height of the upper side of the annular disc, when it rests in contact with the upper end face of the drive ring, and the underside of the end plate 55, which is preferably a component of the housing inner part 38 and covers the annular outlet opening A92 of the upper section of the pressure and / or diffuser chamber 92 - preferably widened with respect to its passage cross-sectional width - and in particular has the fluid outlets directed upwards along the central axis 20, such as 51, 52, 53, 54, or at least one limiting element (not shown in Figure 3), which is attached to the underside of the end plate 55 in a downwardly projecting manner. The drivers, such as 73, 74, 75 of the drive ring 59, thus remain engaged with the annular disc 58 even when it floats upwards, i.e.The coupling of drive ring 59 and annular disc 58 to each other is maintained in the respective rotational direction of the drive ring 59, even when the annular disc 58 floats upwards. Thus, the annular disc 58 can be rotated in the circumferential direction, i.e., both clockwise and counterclockwise, even when it floats upwards by rotating the drive ring 59. This is indicated in Figure 7 by two arrows U pointing in opposite directions in the circumferential direction.

[0138] The drive ring 59 expediently has a flat upper side or end face when viewed in its at least approximately horizontal plane, so that the annular disc 58 can sit there in a defined reference position when the level of the flushing liquid F is lower than the height of the upper end face of the drive ring 59, e.g. when the drive motor 42 of the feed pump 21 is switched off and the flushing liquid F has run completely out of the housing 35 from the pressure and / or diffuser chamber 92 and the pump chamber 119 downwards via the pump inlet 39. This reference position of the annular disc 58 largely ensures that the annular disc 58 can float up without critical tilting when the drive motor 42 of the feed pump 21 is switched on due to the pumped flushing liquid F pressing upwards from below. The teeth 71 of the drive ring 59 are particularly arranged below the flat upper side and / or end face.Seating surface provided on its radially outward facing wall.

[0139] The water diverter element 57, in particular its annular disc 58, which opens and closes the various fluid outlets 51, 52, 53, 54 as desired, is shaped as a circular ring so that it can be guided along an inner starting diameter or bearing diameter and driven along an outer side thereof, as will be explained below. Preferably, an inner diameter of the annular disc 58 is larger than an outer diameter of the upwardly directed, cylindrical, in particular circular-cylindrical, wall of the second receiving section 48 of the housing inner part 38, in which the stator 50 of the drive motor 42 is accommodated. Due to this arrangement, at least three of the fluid outlets 51, 52, 53, 54 can be opened and closed on the same pitch circle in a corresponding combination. However, four or five fluid outlets are also possible.In addition, it is possible to arrange the fluid outlets 51, 52, 53, 54 geometrically further apart from each other than was possible with previous water diverter solutions with a rotatable circular disc as a water diverter element, which results in shorter paths to the different spray devices 24, 25, 26.

[0140] Fig. 9 shows a schematic sectional view of an embodiment of a water diverter 23 as mentioned above in a horizontal sectional plane below the annular disc 58 through the drive ring 59. In Figure 9, the end plate 55 with the fluid outlets 51, 52, 53, 54 and the annular disc 58 of the water diverter 23 are not visible, but only the drive ring 59, an upper part of the upper housing part 37, and a water diverter drive 76 for rotating the drive ring 59 (and the annular disc 58 coupled to it) about the central axis 20, so that the fluid outlets 51, 52, 53, 54 can be selectively blocked and released. In this embodiment, the water diverter drive 76 has a first housing part 77 which is integrally formed on the upper housing part 37.A second housing part 78 is positively connected, in particular latched or snapped, to the first housing part 77—here preferably along its longitudinal extent—with the second housing part 78 closing the first housing part 77. Between the first housing part.

[0141] A sealing element, for example in the form of an O-ring, can be provided between the first housing part 77 and the second housing part 78. The housing parts 77, 78 enclose a common interior space 79, which is filled with rinsing fluid F during operation of the pump device 19.

[0142] The water switch drive 76 further comprises a stator 80 mounted externally on the second housing part 78 and a rotatable rotor 81 arranged within the fluid-filled interior space 79. The rotor 81 is rotationally fixedly connected to a drive shaft 82, which in turn is rotatably mounted on the two housing parts 77,

[0143] 78 is mounted. Attached to the drive shaft 82 at its end section opposite the rotor 81 and the stator 80 associated with it outside the second housing part is a worm 83, which engages with the toothing 71 of the drive ring 59. A lower edge of the worm 83 is positioned no lower than the lower edge of the drive ring 59, so that the interior 79 can be drained. The water diverter drive 76 is a wet-running motor. The water diverter drive 76 is an electric motor.

[0144] The drive ring 59 is received in an annular groove 84 filled with rinsing liquor and / or fresh water F, which is preferably formed on the upper region of the housing upper part 37, in particular the end region of the latter. Several guide webs 85, 86, 87, 88 project radially outward from the radially inner boundary wall of the annular groove 84, along which the drive ring 59 is guided on the inside. The number of guide webs is arbitrary. Preferably, at least three guide webs are provided. The annular groove 84 can be drained via a drainage opening 89 in the direction of the central axis 20. The drainage opening 89 can, as in this exemplary embodiment, preferably be provided in the meshing area of ​​the screw 83 with the drive ring 59, so that this meshing area can be advantageously rinsed free of any dirt particles, solid detergent residues, lime particles, etc. that may have been carried there with the rinsing liquid.However, it can also be provided on a different circumferential section of the annular groove 84. The drainage opening 89 opens below the annular disc 58 at the level of the bottom of the annular groove 84 or below this into the upper region of the pressure and / or diffuser chamber 92. Its drain bottom begins at the bottom of the annular groove 84 and then preferably breaks through the radially inner boundary wall of the annular groove with a gradient in the direction of the central axis 20 to the pressure and / or diffuser chamber 92. So that flushing fluid can drain freely from the meshing area of ​​the worm gear 83 and drive ring 59 via the drainage or drain opening 89, it is expedient if the bottom or base of the housing 77, 78 of the wet-running water switch drive 76 is the same height as or higher than the bottom of the annular groove 84.It can be particularly beneficial for the drainage of the flushing liquid if the bottom of the housing 77, 78 of the wet-running water diverter drive 76 has a gradient in the direction of the meshing area between the external toothing 71 of the drive ring 59 and the worm gear 83. In particular, the worm 83 is freely rotatable with a free height clearance from the bottom of the annular groove 84 or from the bottom of the housing 77, 78 of the water diverter drive 76, so that the flushing liquid can flow out of its interior 79 via the drainage opening 89 into the pressure and / or diffuser chamber 92 and is not blocked or locked by the worm 83 as a barrier when the feed pump 21 of the pump device 21 is switched off. The interior 79 of the water diverter drive 76 is thus in fluid communication with the annular groove 84. Thus, the interior space 79 can also be drained via the annular groove 84 and the drainage opening 89 in the direction of the central axis 20.

[0145] The interior space 79 and the annular groove 84 form a fluid chamber 90 filled with flushing fluid F. Within the fluid chamber 90 are the rotor 81, the drive shaft 82, the worm 83 and the drive ring 59. Thus, no dynamic or moving seal is required.

[0146] In order to be able to vary the required electrical input power and the direction of rotation of the water switch drive 76, the water switch drive 76 is preferably designed as a brushless motor. In particular, the water switch drive 76 is a permanent synchronous motor (PMSM). Preferably, the water switch drive 76 is a brushless direct current (BLDC) motor. The water switch drive 76 is electronically commutated.

[0147] A brushless alternating current (BLAC) motor can also be used for the water switch drive 76. Depending on the motor type selected for the water switch drive 76, suitable sensor functions can be incorporated.

[0148] The water diverter drive 76 is designed as a wet rotor, so that no losses, in particular friction losses and / or leakage losses, are generated by dynamic or moving seals during operation of the pumping device 19. In particular, the wet rotor water diverter drive does not have a drive shaft seal, preferably a drive shaft mechanical seal, as is the case with a dry rotor, in which the rotor chamber equipped with the rotor is separated from the chamber filled with the pumped flushing liquid, preferably by a partition wall, and sealed off from it to keep it dry, and the drive shaft connected to the rotor projects from the rotor chamber through a breakthrough opening sealed by a shaft seal into the chamber filled with the pumped flushing liquid.In addition, the worm gear 83 on the drive shaft 82 offers the possibility of transmitting a maximum gear ratio and thus the maximum torque with the lowest possible electrical input power to the drive ring 59 of the water diverter element 57 with just one gear stage. The gear ratio between the worm gear 83 and the drive ring 59 is preferably in the range of 1:50 to 1:250. A hard ferrite ring is preferably used as the material for the rotor 81. This eliminates the need for corrosion protection.

[0149] The advantages of this previously explained arrangement, which does not require a seal, in particular a dynamic seal, preferably a shaft seal, include minimizing the losses that would otherwise be associated with dynamic or moving seals, no wear on the seals over the service life of the pump device 19, and a dirt-tolerant gear system, since the worm 83 removes dirt from the gearing 71 of the drive ring 59 as it rotates. This offers a particular advantage over spur gearing. The worm 83 can, in particular, have globoid gearing.

[0150] Furthermore, a change in direction of rotation and a change in speed are possible. It is possible to generate the highest possible gear ratio with only one gear stage. The worm 83 can be designed with a single thread. The drive ring 59 has the largest possible diameter to generate the highest possible gear ratio and the greatest possible torque with the smallest possible water switch drive 76. This conserves resources.

[0151] The water diverter drive 76, in particular its worm gear, can preferably be positioned at an angle of at least approximately 90° to the central axis 20 or to the axis of rotation of the drive ring 59 in its at least approximately horizontal or horizontal plane, as shown in the sectional plane of Figure 9. If necessary, it may also be expedient if the water diverter drive 76 is arranged at an angle other than 90° transverse to the central axis 20. In particular, it can be advantageous if the water diverter drive 76 is inclined or obliquely arranged such that the bottom of its elongated housing formed from the first housing part 77 and the second housing part 78 has a gradient in the direction of the worm 83. The second housing part 78, in which the rotor 81 is accommodated, is arranged higher than the first housing part 77 with the worm 83.Thus, flushing fluid can flow out of the elongated housing of the water diverter drive 76, formed by the first housing part 77 and the second housing part 78, into the annular groove 84, and from there back into the diffuser chamber 92 via the drainage opening 89 when the feed pump 21 is switched off. In this way, blind holes or collection points in the water diverter drive 76 and in the annular groove 84 with the drive ring 59, in which flushing fluid or dirt can remain, are largely avoided. The water diverter 23 is thus particularly resistant to dirt.

[0152] By using the worm gear 83 and the toothing 71 of the drive ring 59, a self-locking mechanism can be achieved, preventing the water diverter element 57 from accidentally rotating. The high transmission ratio between the worm gear 83 and the toothing 71 of the drive ring 59 ensures that the water diverter disc 57 can always be rotated reliably, even in the event of frictional forces acting between the drive ring 59 and the upper housing section 37.

[0153] The previously explained arrangement of the pumping device 19 offers several advantages. It advantageously eliminates the need for a pressurized sealing point between the feed pump 21 and the water separator 23. This results in a reduced overall height and thus a smaller installation space requirement for the entire pumping device 19. A reduction in water consumption and the so-called round-flow volume is possible. In particular, the total flushing fluid capacity of the pumping device 19 can be reduced compared to previous pumping devices. The pumping device 19 enables a circulation pump system with higher efficiency. This results in more possible positions and / or a combination of open and closed fluid outlets such as 51, 52, 53, 54. There is a uniform flow to the fluid outlets such as 51, 52, 53, 54. There is also the possibility of spatial separation of the fluid outlets such as 51, 52, 53, 54.

[0154] The water diverter element 57 is, as previously explained, preferably constructed in two parts within the pump device 19. The function of the annular disc 58 as a perforated disc is decoupled from the drive ring 59, which serves as the drive for the annular disc 58. This arrangement allows the drive ring 59 to be driven preferably tangentially via the toothing 71, thus optimally designing a bearing clearance between the drive ring 59 and the driving screw 83. In addition, the circular ring disk 58 can be mounted in a floating manner on the drive ring 59, so that when water pressure is applied, it can float upwards in the axial direction AX from the drive ring 59 and, with its one or more closed wall sections, which are located between its circumferentially distributed openings such as 61, 62, 63 which can be supplied with rinsing liquid, the inlet openings such as E51, E52, E53, E54 of fluid outlets to be blocked, such as e.g.B. 51, 52, 53, 54 can be sealed more effectively.

[0155] The floating of the annular disc 58 (along the central axis 20) can in particular be in the range of 0.2 mm to 2 mm in order to generate the lowest possible flow losses in the area of ​​a support between the annular disc 58 and the drive ring 59. As already explained above, the drivers 73, 74, 75 on the drive ring 59 are expediently positioned so that the annular disc 58 can only be mounted in a defined position (Poka Yoke). Plastic, for example polyoxymethylene (POM), is preferably used as the material for the drive ring 59 and the annular disc 58. An inner diameter of the drive ring 59 and the annular disc 58 can in particular be in the range of 50 mm to 120 mm. An outer diameter of the drive ring 59 and the annular disc 58 can preferably vary between 90 mm and 200 mm.The axial thickness of the annular disc 58 (in the axial direction AX) is, for example, 1.4 mm to ensure a certain degree of flexibility. Preferably, the axial thickness of the annular disc is in a range between 0.8 mm and 3 mm.

[0156] This advantageously allows for a floating mounting of the annular disc 58. This results in as many output combinations as possible with the openings 61, 62, 63 in the annular disc 58 on the same pitch circle. The floating mounting of the annular disc allows it to seal off fluid outlets 51, 52, 53, 54 that are to be blocked particularly well. The two-part design of the water diverter disc 57 simplifies the floating of the annular disc 58. This reduces the risk of tilting and / or jamming of the annular disc 58.

[0157] The floating bearing of the annular disc 58 decouples it from any bearing play of the water diverter drive 76. The complexity of different water diverter elements 57, which can vary in particular with regard to the number, shape and / or size of their openings provided for liquid distribution, is shifted into a structurally simple to manufacture part, namely the annular disc 58. Since the drive ring 59 does not float, or floats to a lesser extent, and maintains its position relative to the element driving it, in the form of the worm 83 of the water diverter drive 76, a more precise orreduced center distance tolerance (between the rotational axis of the drive shaft 82 of the water diverter drive 76, which has the worm 83, and the rotational axis of the drive ring) in the gear stage formed by the worm 83 and the toothing 71 of the drive ring 59, and thus a more precise positioning between the worm 83 and the toothing 71 of the drive ring 59. This results in a defined engagement of the worm 83 in the drive ring 59. The water diverter 23 is easy to repair, since in the event of wear, the drive ring 59 can be replaced independently of the annular disc 58. Reduced friction of the drive ring 59 on the housing 35 is achieved when the pump device 19 is switched off, ie when its feed pump 21 is off and the drive ring 59 is rotated by means of the water diverter drive. This leads to a reduction in wear. This results in a pump device 19 switched on (iewhose feed pump 21 is running) a uniform flow of flushing liquid onto the annular disc 58 from below and thus a lower risk of the annular disc 58 tipping over. Not several closure elements are required, but only a single closure element in the form of the annular disc 58 within the pump device 19.

[0158] Figure 10 shows a sectional view of an embodiment of a fluid outlet as mentioned above, such as 51, in a sectional plane parallel to the central axis 20. All subsequent explanations regarding the fluid outlet 51 are applicable accordingly to the fluid outlets 52, 53, 54. In the orientation shown in Figure 10, the fluid outlet 51 extends from the top of the end plate 55. The fluid outlet 51 has the geometry of an asymmetric funnel.

[0159] The fluid outlet 51 comprises a tubular connecting section 91. The connecting section 91 can be circular, oval, or elliptical in cross-section, i.e., in a plane perpendicular to the central axis. An oval cross-section has the advantage that installation space can be saved along the radial direction R, while, compared to a circular cross-section, a larger flow cross-section can be achieved with the same installation space along the radial direction R. One of the supply lines 30, 31, 32 is connected to the connecting section 91 on the outlet side.

[0160] Viewed in a sectional plane perpendicular to the central axis 20, an annular, in particular circular, pressure and / or diffuser chamber 92 is formed between the housing lower part 36, the tubular heating element 40, the housing upper part 37 as the outer wall, and the second receiving section 48 of the housing inner part 38 as the inner wall. The pressure and / or diffuser chamber 92 extends from the pump chamber 119 equipped with the impeller 43 in the direction of the water diverter element 57. The pressure and / or diffuser chamber 92 is constructed rotationally symmetrically to the central axis 20. Viewed spatially, it is at least approximately circularly cylindrical, at least in sections.Preferably, the upper end section of the pressure and / or diffuser chamber 92, which is located upstream of the water diverter element 57 in the flow direction of the flushing liquid F pumped upwards by the feed pump 21, is widened compared to the upstream section of the pressure and / or diffuser chamber 92, to which, in particular, the tubular heating element is assigned as an outer wall. It distributes the flushing liquid F onto the annular disc 58 of the water diverter element 57. The water diverter element 57 is integrated into the pressure and / or diffuser chamber 92. The fluid outlets 51, 52, 53, 54 open out of the pressure and / or diffuser chamber 92, in particular projecting at least approximately vertically.

[0161] In the area below the water diverter element 57, in particular below its annular disk 58, the rinsing liquid F flows in a flow direction S (see Figure 4) in a circle around the central axis 20 in the pressure and / or diffuser chamber 92, which is annular in a sectional plane perpendicular to the central axis 20, when the pump device 19 is in operation. It leaves the pressure and / or diffuser chamber 92 through those fluid outlets such as 51, 52, 53, 54, which are released with the help of the water diverter 23, along the axial direction AX upwards to the corresponding supply lines 30, 31, 32 in order to supply the spray devices 24, 25, 26 with rinsing liquid F. This is because the impeller 43, which is driven to rotate in the pump chamber 119, imparts a rotational orThe circulation flow is preferably directed in a preferred direction of rotation (preferred direction of rotation) S, which moves from bottom to top in the axial direction through the circular-cylindrical gap of the pressure and / or diffuser chamber 92. In the exemplary embodiment, the preferred direction of rotation S of the rotational flow is clockwise.

[0162] As Figure 10 shows, the connection section 91 is adjoined on the downstream side by a transition section or inlet section 93, by means of which the tubular connection section 91 is connected to the housing inner part 38, in particular its upper end plate 55. The transition section 93 has an asymmetrical funnel geometry as mentioned above. This geometry can also be referred to as shoe-shaped.

[0163] The transition section 93 has a rounded portion or a radius 94. Opposite the radius 94, a bevel 95 is provided, which, with the aid of a radius 96, merges into the end plate 55 and, with the aid of a radius 97, into the connecting section 91. The transition section 93 runs completely around the connecting section 91, with the radius 94, the bevel 95, and the radii 96, 97 merging into one another. The geometry of the fluid outlet 51 is adapted in the preferred flow direction S within the pump device 19 by the radii 94, 96, 97 and the bevel 95 and by the resulting asymmetrical geometry toward the connecting section 91, so that an optimal inflow of the rinsing liquor and / or the fresh water F into the fluid outlet 51 is possible.

[0164] This asymmetrical geometry, which can also be referred to as a shoe geometry, at least approximately simulates a small spiral casing for the fluid outlet 51. Furthermore, the radii 94, 96 of the fluid outlet 51 are continued by means of radii 98, 99 at the openings 61, 62, 63 of the annular disk 58 of the water diverter 23. Furthermore, radius 94 is also applied to a side of the fluid outlet 51 facing away from the preferred direction of rotation S of the flushing fluid, so that flushing fluid F flowing opposite to the preferred flow direction or main flow direction S can also flow into the fluid outlet 51. The preferably elliptical cross-sectional geometry of the fluid outlet 51 or the connection section 91 also enables an enlargement of the flow cross-section without an enlargement of a diameter of the water diverter element 57, in particular its annular disc 58, and / or a diameter of the pump device 19.

[0165] For the flushing liquid pumped during operation of the pumping device 19, the flow geometric conditions in the transition area between the upper end section of the pressure and / or diffuser chamber, the water diverter element accommodated there, in particular its annular disc, and the fluid outlet to be supplied with flushing liquid can be summarized as follows:

[0166] When the feed pump 21 is switched on, the flushing fluid F, which is pumped from bottom to top, rotates in the end region of the pressure and / or diffuser chamber 92 with a preferred direction of rotation S, in this embodiment, clockwise, for example. In order to be able to flow flushing fluid F to a specific fluid outlet, such as 51, the annular disc 58 of the water diverter element 57 is rotated such that one of its openings, such as 61, comes to rest in front of the inlet opening E51 of the fluid outlet 51 to which flushing fluid F is to flow, and exposes the inlet opening E51.The fluid outlet 51 is expediently designed such that, viewed in the preferred direction of rotation S, its transition section 93 has a larger bending radius at an upstream boundary wall region along which the rotational flow having the preferred direction of rotation S first deflects into the inlet opening E51 of the fluid outlet 51, than a downstream boundary wall region viewed in the preferred direction of rotation S. As a result, the rinsing liquid flow arriving with the preferred direction of rotation S can adapt to the upstream boundary wall region of the transition section 93 facing it, which has a larger bending radius. Separation of the rinsing liquid flow from this boundary wall region or reflections of the rinsing liquid flow at this boundary wall region, as well as the associated turbulence or whirling of the rinsing liquid flow, are thus largely avoided.By designing the upwardly upturned, rounded flank of the transition section 93, along which the rotational flow having the preferred direction of rotation S first runs, flatter than the opposite flank of the transition section 93 downstream in the circumferential direction, an asymmetric inlet funnel is provided for the flushing liquid flow arriving in the preferred direction of rotation S, which at least largely or almost completely captures said flow and feeds it into the connecting section 91 of the fluid outlet 51. Viewed differently, the flatter, rounded boundary wall region of the transition section 93 in the preferred direction of rotation S, with the width of the asymmetric inlet opening of the transition section, is opposed by a steeper, rounded, upwardly directed boundary wall region of the transition section 93.The latter has a smaller rounding radius than the boundary wall area of ​​the inlet section, along which the rotational flow of the rinsing liquid arriving in the preferred direction of rotation first runs and enters the connecting section of the fluid outlet arranged downstream of the inlet section. The transition section 93 is thus more widely flared on one side in its inlet area where the fluid flow rotating in the preferred direction of rotation S first enters, while the opposite inlet zone of the inlet or transition section 93, spaced apart from it in the preferred direction of rotation S, is less flared. The latter can, in particular, introduce any residual flow of the rinsing liquid circulating counter to the preferred direction of rotation S into the inlet opening E51 of the fluid outlet 51.The advantage of this arrangement shown in Figure 10 is the optimal deflection of the flushing fluid at the fluid outlet 51 in order to achieve the greatest possible hydraulic efficiency of the pumping device 19. This results in optimal utilization of the flow cross-section of the fluid outlet 51, since no, or at least less, turbulence occurs when the flushing fluid F flows into the fluid outlet 51, and thus its entire flow cross-section can be utilized. The preferably elliptical cross-section of the fluid outlet 51 or of the connecting section 91 enables an increase in the flow cross-section without increasing the diameter of the water diverter element 57 of the water diverter 23 and thus leads to a more compact pumping device 19.

[0167] Figure 11 shows a schematic plan view of an advantageous embodiment of a sealing device 100 between the housing lower part 36 and the tubular heating element 40 of the pumping device 19 according to Figure 3. Figure 12 shows a schematic sectional view of the sealing device 100 in a section along its diameter in a sectional plane perpendicular to the image plane of Figure 11. The sealing device 100 is designed to seal the tubular heating element 40 in a fluid-tight manner with respect to the housing lower part 36.

[0168] The sealing device 100 is arranged and constructed rotationally symmetrically to the central axis 20. The sealing device 100 is a sealing ring. The sealing device 100 comprises a V-shaped receiving section 101, which is received in an annular groove of the housing lower part 36, shaped to suit its outer geometry. The receiving section 101 has an annular groove 102 that runs completely around the central axis 20 in the circumferential direction and in which the tubular heating element 40 is received. The annular groove 102 is provided between a first, upwardly projecting leg 103 and a second, upwardly projecting leg 104 of the receiving section 101, arranged radially further inward relative to the first leg.

[0169] A deflection section 105 extends from the top of the second leg 104 and is designed to deflect the rinsing liquid F emerging with a radial directional component from the pump chamber 119, which is arranged at least approximately horizontally, upwards in the axial direction AX, as indicated by an arrow 106. The deflection section 105 has an annular, in particular circular, contact surface 107 on the underside, with which the deflection section 105 bears against the inside of the housing lower part 36. From there, it extends upwards, in particular in the shape of a concave groove, and nestles with its upper end section against the upright, in particular at least approximately vertical, inner wall surface of the tubular heating element 40. That isIt forms a negative (concave) rounded edge, here in the exemplary embodiment in particular an edge of at least approximately 90°, between the bottom section of the pump chamber 119 or the housing lower part 36, which in particular runs at least approximately horizontally, and the lower end section of the tubular heating element 40 projecting upwardly, preferably at least approximately vertically. As a result, reflections and / or turbulences of the rinsing liquid flow are largely avoided in the transition region between the bottom of the pump chamber 119 and the tubular heating element 40 projecting upwardly, in particular at least approximately vertically.Due to the hollow-shaped transition region between the floor of the pump chamber 119 and the lower end section of the upwardly directed, in particular at least approximately vertically upwardly projecting, tubular heating element 40, a detachment of the fluid flow from the outer wall boundary in the transition zone of the liquid flow channel, which lies between the pump chamber 119 running transversely, in particular at least approximately perpendicularly, to the central axis and the pressure and / or diffuser chamber 92 arranged downstream of it in the conveying direction and projecting upwards, in particular at least approximately vertically, is avoided, which improves the hydraulic efficiency of the pump device 19.

[0170] Facing away from the contact surface 107, the deflection section 105 has a radius 108. The rinsing solution and / or the fresh water F are deflected by means of the radius 108, as indicated by the arrow 106. The radius 108 forms a fluid-facing side of the sealing device 100. A cylindrical outer surface 109 is provided on the deflection section 105, which is arranged and constructed rotationally symmetrically to the central axis 20. With the outer surface 109, the deflection section 105 rests on the inside against the tubular heating element 40.

[0171] The sealing device 100 seals and fixes the tubular heating element 40 and at the same time directs rinsing liquid F emerging from the impeller 41 upwards in the direction of the tubular heating element 40 with the aid of the radius 108 or a chamfer. No residues or accumulations of rinsing liquid, i.e. rinsing solution and / or fresh water, F form within the pumping device 19. This makes it possible to optimize the hydraulic efficiency of the pumping device 19, avoid residues of the rinsing solution and / or fresh water F within the pumping device 19 and reduce the circulation volume, in particular reduce a dead volume, of the pumping device 19. A corner orThis avoids the formation of an edge in which flushing liquid could otherwise remain if the drive motor 42 of the feed pump 21 is switched off and the flushing liquid F flows back to the pump inlet 39 against its feed direction and flows out of the latter. This reduces the dead volume of the pump device 19. If the feed pump 21 is switched off, the gradient of the groove-shaped deflection section 105 ensures that the flushing liquid flowing back from top to bottom in the pressure and / or diffuser chamber 92 is directed to the impeller 41 in the pump chamber 119 and from there flows out of the pump device 19 via the pump inlet 39 arranged below it. The emptying of the pump device 19 is thus improved if the drive motor 42 of the feed pump 21 is switched off.

[0172] The sealing device 100 fixes the tubular heating element 40 within the pumping device 19 and simultaneously seals it. Furthermore, the sealing device 100 with the radius 108 comprises a hydraulically optimized geometry to optimize the hydraulic efficiency of the pumping device 19 and minimize residues of flushing fluid F within the pumping device 19 after pumping.

[0173] The V-shaped receiving section 101 fixes and seals the tubular heating element 40 and, at the same time, during continuous conveying operation of the feed pump 21 (with the drive motor 42 switched on), smoothly guides the flushing fluid F emerging from the impeller 41 upwards to the tubular heating element 40 with the aid of the aforementioned chamfer or radius 108 on the fluid-facing side of the sealing device 100. Furthermore, this fills the aforementioned annular groove of the housing base 36, preventing any residues or accumulations of the flushing fluid F from forming within the pump device 19.

[0174] The advantages of this previously explained arrangement are an optimization of the hydraulic efficiency of the pumping device 19, the avoidance of a residual amount of rinsing liquid F within the pumping device 19, which leads to a more hygienic design, and a reduction of the circulation amount of rinsing liquid F and thus a reduction in dead volume.

[0175] Returning again to Figure 3, when the pump device 19 is in operation and the drive motor 42 is switched on, the impeller 41 draws flushing liquid F from the pump sump 16 via the intake port 22 connected to the pump inlet 39. The flushing liquid F is conveyed upwards via the pressure and / or diffuser chamber 92 in the direction of the water diverter 23, in particular in the direction of the water diverter element 57.The rinsing liquid F flows through the pump inlet 39 arranged centrally at the lowest point of the pump device 19 into the pump chamber 119 equipped with the impeller 41, flows within this along the radial direction R outwards to the radius 108 of the sealing device 100 and is deflected from there into the pressure and / or diffuser chamber 92 fluidically arranged downstream of the pump chamber 1119 in the orientation of Figure 3 when viewed spatially in particular in a helical manner upwards and along the axial direction AX, i.e. against the direction of gravity g, and is conveyed towards the water diverter element 57 which is accommodated in the upper end section of the pressure and / or diffuser chamber 92.

[0176] Within the pressure and / or diffuser chamber 92, the flushing liquid F flows along the preferred direction of rotation S around the central axis 20 (see Figure 4) and moves from bottom to top, i.e., it moves as a helical flow from bottom to top. The preferred direction of rotation or main flow direction S is clockwise in the present case. However, the preferred direction of rotation S can also be counterclockwise. The annular disc 58 of the water diverter element 57 floats on the flushing liquid F, with the annular disc 58 being lifted off the end face 72 of the drive ring 59 and pressed against the inside of the end plate 55. As a result, the annular disc 58 is sealed off from the end plate 55, so that the rinsing liquid F can only flow out of the pump device 19 through those fluid outlets 51, 52, 53, 54 that are exposed to the annular disc 58.The circular disc 58 is driven by the drivers 73, 74, 75 of the drive ring 59 in its direction of rotation, so that even when it floats during ongoing delivery operation of the feed pump 21, it can be brought into a desired rotational position by rotating the drive ring 59 using the motor of the water diverter drive 76. Even when the circular disc 58 is lifted off the drive ring 59, the connection between the circular disc 58 and the drive ring 59 remains in its respective direction of rotation, so that the water diverter drive 76 can still rotate the circular disc 58.

[0177] During operation of the pump device 19, the regulating and / or control device 34 can actuate the water diverter drive 76 to rotate the water diverter disc 57 and thus selectively open and / or close individual or all fluid outlets 51, 52, 53, 54. This allows the spray devices 24, 25, 26 to be switched on or off separately. It is thus possible, for example, to specifically apply rinsing fluid F only to the two spray devices 24, 25 and not to the spray device 26.

[0178] The spray devices 24, 25, 26 can therefore be activated or deactivated as desired. The activation or deactivation of the spray devices 24, 25, 26 preferably occurs during a rinsing cycle, which is carried out using a rinsing program. The rinsing program can be stored in the regulating and / or control device 34. Any number of different rinsing programs can be stored in the regulating and / or control device 34.

[0179] The pump inlet 39 forms in particular a lowest point of the pump device 19. This leads to the rinsing liquid F completely draining out of the pump device 19 due to gravity, as indicated in Figure 3 by means of an arrow 110.

[0180] The previously explained design of the pumping device 19 results in the carryover of rinse liquid from one rinse bath to the next being kept as low as possible during a wash cycle of the household dishwasher 1. This goal is achieved by keeping the residual amount of rinse liquid F after pumping out as low as possible, especially in the pump sump 16, the outlet connection 17' (if present), the intake connection 22, and the pumping device 19. A significant effect of reducing the residual amount of rinse liquid F is an improvement in the so-called stain value after drying. This results from the fact that fewer detergent and / or dirt residues can dry onto the dishes and thus become visible when less cleaning liquid or lye is carried over from the cleaning phase of the respective dishwashing program into the final rinse bath of the final rinse phase.

[0181] To ensure complete idling of the pump device 19, the drive motor 42 with the impeller 41 is aligned at least approximately vertically. This means that the central axis 20 runs at least approximately parallel to the direction of gravity g. Likewise, the fluid outlets 51, 52, 53, 54 are arranged at least approximately vertically. To ensure the lowest possible installation height, the water diverter 23 is integrated into the pump device 19. The pressure and / or diffuser chamber 92 of the pump device 19 is preferably an at least partially circular-cylindrical annular gap which surrounds the drive motor 42 on one side, in particular the inside, and is delimited by the tubular heating element 40 on the other side, in particular the outside.

[0182] An exemplary distance between the drive motor 42 and the tubular heating element 40, or a gap width of the at least partially circular-cylindrical pressure and / or diffuser chamber 92, is between 3 mm and 12 mm. This arrangement also allows the waste heat from the drive motor 42 to be transported away by the rinsing liquid F and used to heat it. Furthermore, this arrangement ensures optimal venting of the pumping device 19, since no air chambers are present in an upper region of the pumping device 19, particularly in the area of ​​the water diverter 23.

[0183] This means that when the pump sump 16 is filled with rinsing liquid F, the pumping device 19 fills up with rinsing liquid F in parallel, just like two communicating pipes, and no air chambers are formed, which is advantageous for trouble-free operation of the pumping device 19. The outer boundary of the fluid outlets, such as 51, 52, 53, 54 of the water diverter 23 to the spray devices, such as 24, 25, 26, are preferably located on an outer circular ring, and the inner boundary of the fluid outlets, such as 51, 52, 53, 54 of the water diverter 23 to the spray devices, such as 24, 25, 26, are preferably located on an inner circular ring. This means that they can be optimally arranged there, and on the other hand, one or more openings in the annular disc 58 of the water diverter element 57 can be optimally assigned to them.At least some of the fluid outlets may not have a circular flow cross-section, but rather an oval or circular ring-like flow cross-section.

[0184] During a pumping process with the aid of the pumping device 19, all of the rinsing liquid F flows back into the pump sump 16. One effect is an improvement in the rinsing result. In particular, this leads to fewer stains on the dishes G to be washed. Complete venting of the pumping device 19 is possible without any additional measures. The drive motor 42 can be cooled or cooled via the contact of the stator 50 with the pressure and / or diffuser chamber 92. In this case, only the second receiving section 48, which delimits the pressure and / or diffuser chamber 92 from the inside, is arranged between the stator 50 and the pressure and / or diffuser chamber 92. This results in a very compact design for the pumping device 19, thus resulting in corresponding space advantages.

[0185] In summary, viewed from bottom to top along the central axis 20, the functional sections of the liquid conveying channel 121 of the pumping device 19 are provided at successive heights as a pump inlet 39, a pump chamber or impeller chamber 119 with an impeller or impeller 41 that can be driven to rotate therein for conveying the rinsing liquid F, a pressure and / or diffuser chamber 92 arranged downstream of the pump chamber 119, a water diverter element 57 that can be rotated about the central axis 20 in the upper end section of the pressure and / or diffuser chamber 92, and the plurality of fluid outlets such as 51, 52, 53, 54 of the pumping device 19. The term liquid conveying channel is understood to mean the cavity provided in the housing 35 of the pumping device 19, which is filled and flowed through by the rinsing liquid F during conveying operation of the pumping device 19.As a result of this vertical sequence of the various functional sections of the liquid conveying channel 121 of the pumping device, the flushing liquid F is guided from the pump inlet 39 to the outlet opening such as A51, A52, A53, A54 of the respective fluid outlet such as 51, 52, 53, 54, as viewed in the housing 35 from bottom to top, rising upwards against the direction of gravity g. Deflections and / or reflections of the conveyed flushing liquid F with a directional component in the direction of gravity g, i.e. in the opposite direction to its bottom-up conveying direction, are largely avoided. A retrograde flow of the flushing liquid F conveyed by the impeller 41 from bottom to top on its way through the liquid conveying channel 121 is therefore largely avoided.In addition, the sequential arrangement of the various functional sections of the liquid conveying channel 121 is favorable for a simple structure and the associated simple manufacture of the pumping device 19. Conversely, the pumping device 19 can be easily disassembled, for example in the event of repair, and every essential component of the pumping device can be made accessible. Furthermore, this sequence of the various functional sections of the liquid conveying channel 121 ensures that the rinsing liquid F can flow completely downwards via the pump inlet 39 solely through the action of gravity when the drive motor 42 for the impeller 41 is switched off and the impeller 41 is stationary. In order to ensure that the liquid conveying channel 121 runs as completely empty as possible, it is particularly favorable if the pump inlet 39 is expediently provided at the lowest point of the pumping device 19.This prevents residual water from remaining in the liquid conveying channel 121 of the housing 35 of the pumping device 19 when the drive motor 42 of its impeller 41 is out of operation. As a result, there is little or no risk of dirty water and / or lye carryover when changing the rinse bath from one partial rinse cycle, such as the cleaning cycle, to the subsequent partial rinse cycle, such as the intermediate rinse cycle or final rinse cycle of the rinse cycle of a dishwashing program.This is because when the rinsing bath is changed, the rinsing liquid used for the respective partial rinse cycle can now at least almost completely flow out of the pump device 19 and be removed from the hydraulic circuit, in particular by pumping out the pump sump 16 using a drain pump (not shown in Figures 2 and 3), and new rinsing liquid, in particular fresh water, can be fed to the hydraulic circuit 33 for the next partial rinse cycle without this being able to mix with dead or residual water from the previous partial rinse cycle. As a result, there are fewer or no stains from dirt particles, limescale particles, etc. on the rinsed and subsequently dried items G, i.e. the rinsing result is improved. In particular, the intermediate rinse cycle previously provided between the cleaning cycle and the final rinse cycle can now be carried out if necessary.be carried out with a smaller amount of fresh water or even be eliminated entirely, since rinsing out residual or dead water containing dirt particles and / or cleaning agent from the pumping device 19 is no longer absolutely necessary.

[0186] In particular, in the pump device 19 with the central axis 20 oriented along the direction of gravity g, which preferably corresponds to the axis of rotation of the motor shaft 43 for the impeller 41, the pump inlet or the suction opening 39 is arranged centrally to the at least approximately vertically aligned motor shaft 43 and the impeller 41 mounted concentrically thereon, i.e. its suction direction runs at least approximately vertically from bottom to top. As a result, the rinsing liquid F present in the liquid conveying channel 121, i.e. in the liquid-conducting cavity of the housing 35, can flow particularly quickly and completely from top to bottom out of the pump inlet 39 when the drive motor 42 for the drive shaft 43 of the impeller 41 changes from its switched-on state to its switched-off state.

[0187] The pumping device 19 expediently has a liquid conveying channel 121 with such fluid-directing geometries of its wall boundaries which direct the rinsing liquid at least after the pump chamber 119 arranged downstream of the pump inlet 39 of the pumping device 19, in which the impeller 41 for conveying the rinsing liquid F is rotatably accommodated, in particular from the inlet opening 122 of the pump inlet 39, to the outlet opening of the fluid outlet such as 51, 52, 53, 54, which can be opened by means of the water diverter 23, in particular the water diverter element 57, and can be supplied with rinsing liquid F, in a continuously upward direction from bottom to top. This improves the hydraulic efficiency of the pumping device 19. In addition, it can be idled more effectively, in particular at least almost completely, when the drive motor 42 assigned to its impeller or impeller 41 is switched off. Zones, especially flat, horizontal surfaces, or depressions, hollows, etc..., on or in which flushing liquid F can remain as dead water or residual water in the housing 35 of the pumping device 19 after the drive motor 42 provided for the impeller has been switched off, are thus minimized or even non-existent. In particular, the pumping device 19 conveys the flushing liquid F from the pump inlet 39, in particular at least after leaving the pump chamber 119 with the impeller 41, with a preferred direction primarily, i.e. at least approximately parallel to the central axis 20 from bottom to top. There are no lateral, horizontal surfaces arranged perpendicular to the central axis 20 or even depressions on which flushing liquid would remain when the drive motor 42 of the impeller 41 stops, on or in the boundary walls of the liquid conveying channel 121 in the housing of the pumping device 19. When the drive motor 42 of the impeller 41 is switched on, i.e.During the conveying operation of the pumping device 19, air inclusions in the liquid conveying channel 121 are thus at least almost avoided.

[0188] Advantageously, the pump inlet 39, the pump chamber 119 with the impeller 41 rotatably provided therein, the diffuser and / or pressure chamber 92, and / or the water diverter element 57 in the upper end section of the pressure and / or diffuser chamber 92, which is particularly widened with respect to its passage cross-section, are each arranged and configured rotationally symmetrically to the central axis 20. This is advantageous in order to ensure the lowest possible hydraulic resistance within the liquid conveying channel 121c for the flushing liquid F conveyed or pumped there from bottom to top by the impeller 41 when the impeller 41 is driven in rotation by the drive motor 42. The structure and design of the pumping device 19 are also simplified by the rotational symmetry of its functional sections or units.

[0189] The fluid outlets such as 51, 52, 53, 54 are expediently each designed to be tubular or nozzle-shaped and their outlet openings such as A51, A52, A53, A54 are arranged in particular at the highest point or at the highest points of the liquid conveying channel 121 of the pumping device 19 leading from the pump inlet 39 to the outlet openings of the fluid outlets. This optimizes the hydraulic efficiency of the pumping device 19. This is because the rinsing liquid F conveyed from bottom to top through the pressure and / or diffuser chamber 92 by the rotating impeller 41 continues its forward movement from bottom to top, running parallel to the central axis 20, at least almost unchanged, through the fluid outlet such as 51, 52, 53, 54 opened in each case by means of the water diverter element 57.As a result, the hydraulic resistance for the flushing liquid F when flowing from the pressure and / or diffuser chamber 92 into the one or more fluid outlets opened by means of the water diverter element 57, such as 51, 52, 53, 54, can be kept low or minimal, unlike in the case of fluid outlets leading radially outwards from the pressure and / or diffuser chamber 92.In addition, complete venting of the liquid conveying channel 121 upwards is ensured when filling the pumping device 19 with flushing liquid F via its pump inlet 39, which is fluidically connected to the pump sump 16 (with the drive motor 42 for the impeller 41 stopped and / or running) and / or during operation of the drive motor 42, in which the liquid conveying channel 121 in the housing 35 of the pumping device 19 leading from the pump inlet 39 to the fluid outlet opened by the water diverter element 57 is completely filled with flushing liquid and flows through it from bottom to top, since there are no air chambers in the upper region of the housing 35 of the pumping device 19, such as can be associated with radially running fluid outlets, for example. The constant complete venting of the pumping device 19 is very advantageous for its smooth pumping and conveying operation. Its full hydraulic efficiency is always available.In addition, annoying snorkeling noises are avoided.

[0190] The pumping device 19, which is designed as at least almost a “vertical rotor”, is characterized in particular by the fact that when its liquid conveying channel 121 is filled with rinsing liquid F, the air present in the housing 35 is automatically displaced upwards by the upwardly rising rinsing liquid level and is discharged via the one or more upwardly directed, in particular protruding, fluid outlets opened by means of the water diverter element 57, such as

[0191] 51, 52, 53, 54 can escape from the housing 35. The liquid conveying channel 121 runs from the pump inlet 39 of the pump device 19 to the outlet opening (e.g. A51, A52, A53, A54) of the respective fluid outlet released by the water diverter element 57, ie opened, such as 51, 52, 53, 54. It comprises between the pump inlet 39 and the respective opened fluid outlet, such as 51,

[0192] 52, 53, 54 the pump chamber 119 with the impeller 41 accommodated therein as well as the downstream pressure and / or diffuser chamber 92 of the pump device 19. In particular, when the cavity of the liquid conveying channel 121 is completely filled with flushing liquid F, all of the air is displaced upwards from the liquid conveying channel 121, i.e. from the liquid-conducting cavity of the housing 35 of the pump device 19. In this case, the motor shaft 43 with the impeller 41 can also be stationary when the pump device 19 is being filled with flushing liquid F, i.e. the drive motor 42 for the shaft 43 can be off. During commissioning or when the drive motor 42 is started and / or of course also during ongoing conveying operation of the pump device 19, which is then driven by means of the impeller orSince the impeller 41 in its pump chamber 119 pumps flushing liquid F from bottom to top against the direction of gravity g, any air bubbles present in the liquid conveying channel 121 of the housing 35 are entrained or carried along by the upward-flowing flushing liquid and are always reliably pushed out of the housing of the pump device according to the invention via the one or more upward-facing fluid outlets such as 51, 52, 53, 54 opened by means of the water diverter element 57. In the case of the pump device 19, the air can therefore always escape completely upwards from the pump housing 35 via the fluid outlets such as 51, 52, 53, 54 which are oriented along the central axis 20 and preferably project vertically, so that complete venting of the housing 35 of the pump device 19 is always ensured. In this case, the pump device can advantageously remain free of a guide wheel, which saves a component.

[0193] Figure 13 shows a schematic plan view of an embodiment of a blank 111 for producing the stator 50 of the drive motor 42 and the stator 80 of the water switch drive 76. Figure 14 shows a plan view of an arrangement 112 comprising a first stator lamination, in particular stator lamination stack, 113, which is assigned to the stator 50, and a second stator lamination, in particular stator lamination stack, 114, which is assigned to the stator 80.

[0194] The arrangement 112 of the two stator laminations, in particular stator lamination stacks, 113, 114 is manufactured from the common blank 111. The blank 111 can be circular. However, the blank 111 can fundamentally have any desired geometry. The arrangement 112 can be manufactured from the blank 111, in particular using a stamping process. During the manufacture of the arrangement 112, the first stator lamination, in particular stator lamination stack, 113, and the second stator lamination, in particular stator lamination stack, 114 are preferably manufactured simultaneously, in particular punched out simultaneously from the common blank such as 111. The stator 50 expediently comprises a stack of first stator laminations 113. Accordingly, the stator 80 expediently comprises a stack of second stator laminations 114. The respective stator lamination stack has a plurality of metal sheets, in particular electrical sheets, layered or stacked one above the other.

[0195] The first stator lamination, in particular stator lamination stack, 113 has as its geometric shape a circumferential ring section, in particular a circular ring section, 115, from which a plurality of root sections or teeth 116 extend radially inward. The teeth 116 are preferably evenly distributed around the circumference of the ring section, i.e., two adjacent teeth 116 in the circumferential direction have the same circumferential angular offset from one another. A groove that is open radially inward is thus present between each two adjacent teeth 116. Each of the teeth 116 can preferably have the turns of an electrical coil wound around it in a winding process carried out later in order to produce the stator 50 of the drive motor 42. At the root sections or teeth 116, the first stator lamination, in particular stator lamination stack, 113 has an inner diameter di.The second stator lamination, in particular stator lamination stack, 114 also has a circumferential ring section, in particular a circular ring section, 117, from which a plurality of foot sections or teeth 118 extend radially inward. The teeth 118 are preferably evenly distributed around the circumference of the ring section, i.e., two adjacent teeth 118 in the circumferential direction have the same circumferential angular offset from one another. A groove that is open radially inward is thus present between each two adjacent teeth 118. Each of the teeth 118 can preferably be wound with the turns of an electrical coil in a winding process carried out later in order to produce the stator 80 of the water switch drive 76.The ring portion 117 has an outer diameter da that is equal to or smaller than the inner diameter di, so that the second stator lamination, in particular the stator lamination stack, 114 is arranged within the first stator lamination, in particular the stator lamination stack, 113. In other words, the first stator lamination, in particular the stator lamination stack, 113 of the stator 50 of the drive motor 42 essentially concentrically surrounds the second stator lamination, in particular the stator lamination stack, 114 of the stator 80 of the water switch drive 76.

[0196] It is thus possible to produce both the stator lamination, in particular the stator lamination stack, 113 of the stator 50 of the drive motor 42 and the stator lamination, in particular the stator lamination stack, 114 of the stator 80 of the water switch drive 76 from one and the same blank 111, each with a desired geometric shape, in particular by punching them out. For this purpose, the stator 80 of the water switch drive 76 is dimensioned such that it is smaller than or the same size as a stator cutout in the center of the stator 50 of the drive motor 42 and then forms the stator 80 for the water switch drive 76. Thus, the stator lamination, in particular the stator lamination stack, for the stator 50 of the drive motor 42 and the stator lamination, in particular the stator lamination stack, for the stator 80 of the water switch drive 76 can be produced preferably in a single process step. In this way, the overall waste of stator lamination can be reduced.

[0197] Since the pump device 19 and the water diverter drive 76 are always required in pairs to manufacture the household dishwasher 1, this leads to simplified production and also a reduction in costs. This could be applied analogously to the combination of the stator 50 of the drive motor 42 and the stator of a drain pump.

[0198] It is thus possible to use punching waste generated during the production of the stator 50 of the drive motor 42 to manufacture a stator for another motor, in this case the water switch drive 76, which leads to material savings. In particular, two stator punch packs can be produced simultaneously in a single process step, which leads to manufacturing cost savings. Only one punch pack tool is required, which also reduces investment costs. This advantageously results in resource conservation with regard to material consumption.

[0199] In general terms, the geometric shape of a first stator lamination, in particular a stator lamination stack, for the stator of a first drive motor and, at the same time, the geometric shape of a second stator lamination, in particular a stator lamination stack, which is smaller in diameter, for the stator of a second drive motor are machined from one and the same blank, in particular by punching.

[0200] Figure 15 shows a schematic sectional view of an embodiment of the pumping device 19 modified from the embodiment of Figure 3. In contrast to Figure 3, here in Figure 15 the housing 35 of the pumping device 19 has a one-piece outer housing part 367 which delimits the liquid conveying channel 121, which is at least almost rotationally symmetrical to the central axis 20, to the outside, in particular up to the fluid outlets such as 51 - 54. Instead of the tubular heating element 40, at least one tubular heating element RH is now accommodated in the liquid conveying channel 121. This allows the structure or design of the pumping device according to the invention to be further simplified. It may already be sufficient if the housing 35 of the pumping device 19 is composed of only two parts - the outer housing part 367 and the inner housing part 38. If necessary, a cover part DE can also be provided, with which the upper opening of the inner housing part 38 can be closed.Such a cover part DE is only indicated by dash-dotted lines in Figure 15 for the sake of simplicity of the drawing. This allows the stator 50 accommodated in the housing inner part 38 between its first receiving section 45 and second receiving section 48 to be reliably protected against moisture and / or rinsing fluid. The housing outer part 367 and the housing inner part 38 inserted into or immersed in it can be mechanically connected to one another, for example, by a snap-in, locking, and / or bayonet connection and / or other coupling. Furthermore, the fact that at least one tubular heating element RH is accommodated in the fluid conveying channel 121 formed between the housing inner part 38 and the housing outer part 367 results in improved heat transfer between the tubular heating element RH and the rinsing fluid F conveyed from bottom to top through the fluid conveying channel 121 by means of the impeller or pump wheel 41 of the pumping device 19.

[0201] In particular, the second receiving section 48 forms at least a partial section of the inner boundary wall of the liquid conveying channel 121.

[0202] The tubular heating element RH is expediently provided in the liquid conveying channel 121 along its flow path after the impeller 41 of the pumping device 19, in particular arranged at least almost rotationally symmetrically to the central axis 20, preferably at least almost concentrically to the second receiving section 48. It is expediently arranged with respect to the central axis orThe central axis of the preferably circular-cylindrical liquid conveying channel 121 is arranged symmetrically in such a way that, viewed in the respective passage cross-sectional plane of the liquid conveying channel 121, there is at least approximately the same gap width for the rinsing liquid F flowing through the tubular heating element RH and the inner boundary wall of the liquid conveying channel 121 formed by the housing inner part 38, as well as between the tubular heating element RH and the outer boundary wall of the liquid conveying channel 121 formed by the housing outer part 367. The tubular heating element RH can thus be largely evenly flowed through by the conveyed rinsing liquid F, which is favorable for the transfer of heat from the tubular heating element to the rinsing liquid flowing past it.

[0203] In particular, it may be sufficient and / or advantageous if the tubular heater RH is accommodated in the liquid conveying channel 121 with only approximately one turn or a partial turn section and runs around the central axis 20, preferably around the second receiving section 48 of the housing inner part 38. In this way, impairments of the flow conditions by the tubular heater RH in the liquid conveying channel 121 can be minimized or largely avoided. In this regard and / or also from a structural point of view, it may be particularly advantageous if the turn or the partial turn section of the tubular heater RH is arranged at least approximately horizontally or in a plane orthogonal to the central axis 20. However, it is also possible for the tubular heater RH to run around the central axis 20 with more than one turn in the liquid conveying channel 121, e.g. if a higher heat transfer to the rinsing liquid is required.

[0204] Reference symbols used:

[0205] 1 household dishwasher

[0206] 2 rinsing containers

[0207] 3 Door

[0208] 4 Washing compartment

[0209] 5 swivel axis

[0210] 6 Loading opening

[0211] 7 Floor

[0212] 8 Ceiling

[0213] 9 Rear wall

[0214] 10 Side wall

[0215] 11 Side wall

[0216] 12 Dishwasher waste holder

[0217] 13 Dishwasher drawer

[0218] 14 Dishwasher drawer

[0219] 15 base supports

[0220] 16 Pump sump

[0221] 17 Outlet opening of the pump sump

[0222] 17' Drain or outlet connection of the pump sump

[0223] 18 Sieve system

[0224] 19 Pumping device

[0225] 20 Central axis

[0226] 21 (Liquid) feed pump

[0227] 22 intake manifold

[0228] 23 Water switch

[0229] 24 spray device

[0230] 25 Spray device

[0231] 26 Spray device

[0232] 27 axis of rotation

[0233] 28 axis of rotation

[0234] 29 axis of rotation

[0235] 30 supply line

[0236] 31 Supply line 32 Supply line

[0237] 33 Hydraulic circuit

[0238] 34 Control and regulation device

[0239] 35 housings

[0240] 36 Housing base

[0241] 37 Upper housing part

[0242] 38 Housing interior

[0243] 39 Pump inlet

[0244] 40 tubular heating element

[0245] 41 Impeller

[0246] 42 drive motor

[0247] 43 Drive shaft

[0248] 44 Rotor

[0249] 45 Recording section

[0250] 46 Recording Room

[0251] 47 Closure

[0252] 48 Recording section

[0253] 49 Recording Room

[0254] 50 Stator

[0255] 51 Fluid outlet

[0256] 52 Fluid outlet

[0257] 53 Fluid outlet

[0258] 54 Fluid outlet

[0259] 55 end plate

[0260] 56 connecting section

[0261] 57 Water switch disc

[0262] 58 circular disc

[0263] 59 Drive ring

[0264] 60 Breakthrough

[0265] 61 Breakthrough

[0266] 62 Breakthrough

[0267] 63 Breakthrough

[0268] 64 guide section

[0269] 65 Guide section 66 Guide section

[0270] 67 recess

[0271] 68 recess

[0272] 69 Recess 70 Base section

[0273] 71 Gearing

[0274] 72 front side

[0275] 73 drivers

[0276] 74 Driver 75 Driver

[0277] 76 Water switch drive

[0278] 77 Housing part

[0279] 78 Housing part

[0280] 79 Interior 80 Stator

[0281] 81 Rotor

[0282] 82 drive shaft

[0283] 83 Snail

[0284] 84 Annular groove 85 Guide web

[0285] 86 guide bar

[0286] 87 Guide bridge

[0287] 88 Guide bridge

[0288] 89 Drainage opening 90 Fluid chamber

[0289] 91 connecting section

[0290] 92 Diffuser room

[0291] 93 Transition section

[0292] 94 Radius 95 Bevel

[0293] 96 radius

[0294] 97 radius

[0295] 98 radius

[0296] 99 Radius 100 Sealing device

[0297] 101 Recording Section

[0298] 102 ring groove

[0299] 103 legs

[0300] 104 legs

[0301] 105 diversion section

[0302] 106 Arrow

[0303] 107 contact surface

[0304] 108 radius

[0305] 109 exterior area

[0306] 110 Arrow

[0307] 111 blank

[0308] 112 Arrangement

[0309] 113 Stator lamination, in particular stator lamination stack

[0310] 114 Stator lamination, in particular stator lamination package

[0311] 115 ring section

[0312] 116 Foot section

[0313] 117 ring section

[0314] 118 Foot section

[0315] 119 Pump room or impeller room

[0316] 120 annular gap between the first receiving section and the second receiving section of the housing inner part

[0317] 122 Pump inlet opening

[0318] 367 one-piece housing outer part

[0319] A Extension direction

[0320] A51 - A54 Outlet openings of the fluid outlets 51 - 54

[0321] A92 Outlet opening of the pressure and / or diffuser chamber 92

[0322] AX axial direction da outer diameter

[0323] DE Cover part di inner diameter

[0324] E Insertion direction E51 - E54 Inlet openings of the fluid outlets 51 - 54

[0325] F Rinse solution and / or fresh water g Direction of gravity

[0326] G Dishes R Radial direction

[0327] RH tubular radiators

[0328] U circumferential direction

[0329] UL guide section

[0330] S Flow direction

Claims

PATENT CLAIMS 1. A household dishwasher (1) comprising a washing container (2) for holding wash ware (G), a hydraulic circuit (33) for supplying wash liquid to the wash ware (G), and a pumping device (19) having a liquid conveying channel (121) for circulating the wash liquid (F) in the hydraulic circuit (33), wherein the pumping device (19) has a central axis (20) oriented along a direction of gravity (g), wherein the pumping device (19) has a water diverter (23) integrated into a housing (35) of the pumping device (19) for selectively distributing the wash liquid (F) to a plurality of fluid outlets (51, 52, 53, 54) of the pumping device (19), and wherein at least one of the, in particular all, fluid outlets (51, 52, 53, 54) are oriented along the central axis (20).

2. Household dishwasher according to claim 1, characterized in that the water diverter (23) has a water diverter element (57) accommodated within the housing (35) and rotatable about the central axis (20) for selectively releasing and blocking the fluid outlets (51, 52, 53, 54).

3. Household dishwasher according to claim 2, characterized in that viewed from bottom to top along the central axis (20) at successive heights a pump inlet (39), a pump chamber (119) with an impeller (41) rotatably provided there for conveying the washing liquid (F), a pressure and / or diffuser chamber (92) arranged downstream of the pump chamber (119), the water diverter element (57) in the upper end section of the pressure and / or diffuser chamber (92), and the plurality of fluid outlets (51, 52, 53, 54) of the pump device (19) are provided.

4. Household dishwasher according to claim 3, characterized in that that the liquid conveying channel (121) of the pumping device (19) is provided with such fluid-directing geometries of its wall boundaries (105, 40, 37, 48, UL, 51, 52, 53, 54) which direct the rinsing liquid (F) from bottom to top in a continuously upward direction, at least after the pump chamber (119) arranged downstream of the pump inlet (39) of the pumping device (19), in which the impeller (41) for conveying the rinsing liquid is rotatably accommodated, in particular from the inlet opening (122) of the pump inlet (39), to the outlet opening (A51, A52, A53, A54) of the fluid outlet (51, 52, 53, 54) which can be opened by means of the water diverter (23), in particular the water diverter element (57), and which can be supplied with rinsing liquid (F).

5. Household dishwasher according to one of claims 3 or 4, characterized in that the pump inlet (39) is provided at the lowest point of the pump device (19).

6. Household dishwasher according to at least one of claims 3 - 5, characterized in that the pump inlet (39), the pump chamber (119) with the impeller (41) rotatably provided there, the pressure and / or diffuser chamber (92), and / or the water diverter element (57) in the upper end section of the pressure and / or diffuser chamber (92) are each arranged and designed rotationally symmetrically to the central axis (20).

7. Household dishwasher according to at least one of claims 3 - 6, characterized in that the fluid outlets (51, 52, 53, 54) are each tubular or nozzle-shaped and their outlet openings (A51, A52, A53, A54) are arranged in particular at the highest point or at the highest points of the liquid conveying channel (121) of the pump device (19) leading from the pump inlet (39) to the outlet openings (A51, A52, A53, A54) of the fluid outlets (51, 52, 53, 54).

8. Household dishwasher according to at least one of claims 2 - 7, characterized in that the water diverter element (57) has an annular disc (58) and a drive ring (59) for driving the annular disc (58), wherein the annular disc (58) has one or more openings (e.g. 61, 62, 63) which can be selectively assigned to the inlet openings (E51, E52, E53, E54) of the plurality of fluid outlets (51, 52, 53, 54) by rotating the annular disc (58) by means of the drive ring (59), in particular can be selectively brought into overlap with the inlet openings (E51, E52, E53, E54) of the plurality of fluid outlets (51, 52, 53, 54).

9. Household dishwasher according to claim 8, characterized in that the drive ring (59) is coupled to the annular disc (58) in a force-transmitting manner in its direction of rotation (U).

10. Household dishwasher according to claim 9, characterized in that the annular disc (58) is coupled to the drive ring (59) in such a way that it lifts off from the top of the drive ring (59) along the central axis (20) and floats on the conveyed rinsing liquid (F) when the impeller (41) is driven in rotation and conveys the rinsing liquid (F) upwards to the annular disc (58), wherein the annular disc (58) remains coupled to the drive ring (59) in the direction of rotation (II).

11. Household dishwasher according to at least one of claims 8 - 10, characterized in that the annular disc (58) closes the outlet opening (A92) of the diffuser and / or pressure chamber (92).

12. Household dishwasher according to at least one of claims 8 - 11, characterized in that the drive ring (59) is received in an annular groove (84) provided in the housing (35).

13. Household dishwasher according to claim 12, characterized in that the housing (35) has a drainage opening (89) pointing in the direction of the central axis (20) which is in fluid communication with the annular groove (84).

14. Household dishwasher according to claim 12 or 13, characterized in that the drive ring (59) is rotatably mounted on guide webs (85, 86, 87, 88) projecting radially into the annular groove (84).

15. Household dishwasher according to at least one of the preceding claims, characterized in that the water diverter (23) has a water diverter drive (76) for driving the drive ring (59), wherein a drive shaft (82) of the water diverter drive (76) is oriented transversely, in particular perpendicularly, to the central axis (20).

16. Household dishwasher according to at least one of the preceding claims, characterized in that the pumping device (19) has a drive motor (42) with a rotor (44) for driving its impeller (41) rotatable in the pumping chamber (119) of the pumping device (19) and a stator (50), wherein the rotor (44) is received in a first receiving section (45) of the housing (35), and wherein the stator (50) is received in a second receiving section (48) of the housing (35).

17. Household dishwasher according to claim 16, characterized in that the first receiving section (45) is arranged within the second receiving section (48).

18. Household dishwasher according to claim 16 or 17, characterized in that the second receiving section (48) surrounds the first receiving section (45) concentrically with an at least approximately circular-cylindrical gap space (120) in which the stator (50) is accommodated.

19. Household dishwasher according to at least one of claims 16 - 18, characterized in that the second receiving section (48) is guided through the central opening (60) of the water diverter element (57), in particular its annular disc (58).

20. Household dishwasher according to at least one of claims 16 - 19, characterized in that in the housing (35), viewed along a radial direction (R) of the pump device (19), its pressure and / or diffuser chamber (92) is delimited by the second receiving section (48) and by a tubular heating element (40) encircling the second receiving section (48).

21. Household dishwasher according to claim 20, characterized in that the housing (35) has a lower housing part (36) and a housing upper part (37), wherein the tubular heating element (40) is arranged between the lower housing part (36) and the upper housing part (37) viewed along the central axis (20).

22. Household dishwasher according to at least one of claims 1 - 20, characterized in that the housing (35) has a, in particular one-piece or one-piece, housing outer part (367) which delimits the liquid conveying channel (121) which is at least almost rotationally symmetrical to the central axis (20) towards the outside, in particular up to the fluid outlets (51, 52), and in that at least one tubular heating element (RH) is accommodated in the liquid conveying channel (121).

23. Household dishwasher according to at least one of claims 16 - 22, characterized in that the housing (35) has a one-piece housing inner part (38) on which the fluid outlets (51, 52, 53, 54), the first receiving section (45) and the second receiving section (48) are formed.

24. Household dishwasher according to at least one of claims 3 - 23, characterized in that the pressure and / or diffuser chamber (92) widens in its upper section in the direction of the water diverter (23).

25. Pumping device (19) for a water-conducting household appliance, in particular for a household dishwasher according to at least one of the preceding claims, wherein it has a central axis (20) which is oriented along a direction of gravity (g), wherein it has a water diverter (23) integrated into a housing (35) of the pumping device (19) for selectively distributing the water to a plurality of fluid outlets (51, 52, 53, 54) of the pumping device (19), and wherein at least one of the, in particular all, fluid outlets (51, 52, 53, 54) are oriented along the central axis (20).

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