Water-conducting household appliance with a heating device having at least one temperature sensor

Abstract

A water-conducting household appliance, comprising a heating device (12) with at least one temperature sensor (28.1, 28.2) and a heating wall (21) which has a first surface (21.1) which is provided with at least one electrical resistance thick-film heating device (22) and which has a second surface (21.2) opposite the first surface (21.1) which forms a contact surface which is designed to thermally conduct the heat generated by the electrical resistance thick-film heating device (22) into the water to be heated, wherein the heating device (12) also has an electrical plug connector (24) which has a plug housing (25) and a plurality of electrical contacts (26, 26.1, 26.2) arranged in the plug housing (25), of which at least two electrical contacts (26.1, 26.2) are electrically connected to connection ends (27) of the electrical resistance thick-film heating device (22), wherein the plug connector (24) has the at least one temperature sensor (28.1, 28.2) which has a sensor body (34), a first electrical sensor connection (35.1) and a second electrical sensor connection (35.2), wherein the plug connector (24) has a first sensor contact (36.1), a second sensor contact (36.2) and a holder (37), and the first electrical sensor connection (35.1) is contacted to the first sensor contact (36.1), the second electrical sensor connection (35.2) is contacted to the second sensor contact (36.2), and the sensor body (34) is fastened to the holder (37), the holder (37) being resiliently mounted on the plug connector (24) in such a way that, when the plug connector (24) is fastened to the heating wall (21), the sensor body (34) is pressed against the heating wall (21) by means of the resiliently mounted holder (37), the holder (37) having a holding section (37.1) to which the sensor body (34) is fastened, and the holder (37) having a spring arm (37.2) flexibly connecting the holding section (37.1) to the plug housing (25), and the spring arm (37.2) being an electrically conductive metal spring arm and, together with the first electrical sensor connection (35.1) or, respectively, together with the second electrical sensor connection (35.2), forming a one-piece metal spring clip component.

Description

[0001] The invention relates to a water-conducting household appliance, comprising a heating device with at least one temperature sensor and a heating wall which has a first surface which is provided with at least one electrical resistance thick-film heating device and which has a second surface opposite the first surface which forms a contact surface which is designed to thermally conduct the heat generated by the electrical resistance thick-film heating device into the water to be heated, wherein the heating device also has an electrical plug connector which has a plug housing and a plurality of electrical contacts arranged in the plug housing, of which at least two electrical contacts are electrically connected to connection ends of the electrical resistance thick-film heating device.

[0002] DE 10 2012 200 398 A1 describes a water-conducting household appliance, in particular a dishwasher, with at least one body, in particular a circulating pump, which is subjected to liquid, in particular through which liquid flows, on which, in particular on the outside, a heating device is arranged, which has conductor tracks through which current can flow, wherein the conductor tracks run in such a way that individual sections of the conductor tracks are substantially parallel to the wall of the body, which is subjected to liquid, in particular through which liquid flows, and have a minimum distance from one another which corresponds approximately to three times the thickness of the body wall of the body, which is subjected to liquid, in particular through which liquid flows, and to which the heating device is assigned.The heating device is designed as a thick-film heater in which the current-carrying conductor tracks are printed on a glass-like paste on the outside of the body wall, so that a good heat transfer to the body and the fluid flowing past it or transported within it is ensured.

[0003] DE 10 2013 217 276 A1 describes a water-conducting household appliance, in particular a household dishwasher, with a heating pump comprising a heating device constructed using thick-film technology. The heating device is provided with a first temperature sensor and a second temperature sensor. Both temperature sensors are arranged directly on the insulating layer of the wall of the heating resistor assembly.

[0004] DE 10 2012 222 363 A1 describes a connector with a housing and several plug connections in this housing, wherein a temperature sensor is integrated into the connector. The device comprising the connector can be a heating device.

[0005] The KR 10 2010 0 001 223 A shows in the Fig. 6 and Fig. 7 a connector with a holder in which a temperature sensor is held.

[0006] The object of the invention is to provide a water-conducting household appliance having an improved heating device.

[0007] The object of the invention is achieved by a water-conducting household appliance, comprising a heating device with at least one temperature sensor and a heating wall, which has a first surface provided with at least one electrical resistance thick-film heating device and a second surface opposite the first surface, which second surface forms a contact surface designed to thermally conduct the heat generated by the electrical resistance thick-film heating device into the water to be heated, wherein the heating device further comprises an electrical plug connector having a plug housing and a plurality of electrical contacts arranged in the plug housing, of which at least two electrical contacts are electrically connected to connection ends of the electrical resistance thick-film heating device, wherein the plug connector has the at least one temperature sensor, which has a sensor body,a first electrical sensor connection and a second electrical sensor connection, wherein the connector has a first sensor contact, a second sensor contact, and a holder, and the first electrical sensor connection is contacted to the first sensor contact, the second electrical sensor connection is contacted to the second sensor contact, and the sensor body is fastened to the holder, wherein the holder is resiliently mounted on the connector such that, when the connector is fastened to the heating wall, the sensor body is pressed against the heating wall by means of the resiliently mounted holder, wherein the holder has a holding section to which the sensor body is fastened, and the holder has a spring arm flexibly connecting the holding section to the connector housing,and wherein the spring arm is an electrically conductive metal spring arm and, together with the first electrical sensor terminal or together with the second electrical sensor terminal, forms a one-piece metal spring clip component.

[0008] The water-conducting household appliance can be a dishwasher. The dishwasher can have a heating pump. In the case of a heating pump, the heating device according to the invention can be part of the heating pump.

[0009] One temperature sensor or two or more temperature sensors may be provided. Each temperature sensor may, for example, be a thermistor. In the case of a thermistor, it may, in particular, be a thermistor with a negative temperature coefficient (NTC). Each temperature sensor may be embodied as a discrete electrical component or as an SMD component.

[0010] If the connector has at least one temperature sensor, this can be understood to mean that the at least one temperature sensor is not only electrically connected to the connector, but is also mechanically held on the connector. Such a mechanical mounting of the temperature sensor on the connector or on a connector housing of the connector accordingly comprises not only a minimal attachment, which may be provided merely by electrical contact, i.e., via electrical connecting lines, but rather such a stable mechanical attachment that the connector, together with the at least one temperature sensor, can be handled as a separate assembly, separate from the heating device or separate from the heating wall.The at least one temperature sensor is therefore already mechanically and securely connected to the connector before the connector and, with it, the at least one temperature sensor, are mounted on the heating wall. This means that the at least one temperature sensor is already attached to the connector housing of the connector before the connector and heating wall are assembled. For example, the functionality of the temperature sensors can be tested even before the connector or temperature sensors are mounted on the heating wall, since the temperature sensors are already fully electrically pre-connected to the connector and can be electrically tested via the sensor connections.

[0011] Because the connector has at least one temperature sensor, the soldering step for electrically contacting a temperature sensor attached to the electrical resistance thick-film heating device with the electrical contacts of the connector can be omitted. If, as is known from the prior art, the temperature sensor were pre-mounted on the heating wall, the connector or its sensor contacts would have to be soldered to the electrical sensor terminals of the temperature sensor while the temperature sensor is already attached to the heating wall. However, since heat is introduced into the heating wall during soldering, this could potentially result in damage to the resistance thick-film heating device or its coating, which cannot be avoided with the solution according to the invention.This can be particularly true if the coating is a chromium-nickel (NiCr) coating, which can be produced by plasma deposition. Furthermore, since the connector has at least one temperature sensor, and thus no soldering of the temperature sensors to the electrical resistance thick-film heating device is necessary, floating and thus displacement of the temperature sensors applied to the heating wall can be avoided. This is particularly important when the temperature sensors are designed as SMD components.

[0012] According to the invention, the temperature sensor comprises a sensor body, a first electrical sensor terminal, and a second electrical sensor terminal. The connector comprises a first sensor contact, a second sensor contact, and a holder. The first electrical sensor terminal is connected to the first sensor contact, the second electrical sensor terminal is connected to the second sensor contact, and the sensor body is attached to the holder.

[0013] The contacts of the connector and the sensor connections can be designed as RAST connectors (RAST 2.5 or RAST 5.0). The holder mechanically connects the at least one temperature sensor to the connector or to the connector housing. The holder can be designed as a snap-in holder. The holder can be manufactured together with the connector housing as a one-piece plastic component.

[0014] According to the invention, the holder is resiliently mounted on the connector, such that when the connector is mounted on the heater wall, the sensor body is pressed against the heater wall by the resiliently mounted holder. This creates a particularly good thermal connection between the temperature sensor and its sensor body and the heater wall. Due to the resilient design of the holder, the material tension of the resiliently preloaded holder can generate a contact force that presses the sensor body against the heater wall.

[0015] According to the invention, the holder has a holding section to which the sensor body is fastened and the holder has a spring-elastic spring arm flexibly connecting the holding section to the plug housing. The spring arm is designed such that when the spring arm is in a relaxed state, i.e. in a state in which the plug connector is not yet mounted on the heating wall, the spring arm projects beyond the underside of the plug housing so that the temperature sensor is positioned outside the plug housing. Once the plug housing is mounted on the heating wall, the temperature sensor and thus also the holding section are repositioned inside the plug housing, wherein the spring arm is elastically pretensioned and exerts a pressing force on the temperature sensor so that it is pressed against the heating wall.

[0016] According to the invention, the spring arm is an electrically conductive metal spring arm and, together with the first electrical sensor connection or together with the second electrical sensor connection, is formed as a one-piece metal spring clip component. In such a variant, the metal spring arm not only forms a mechanical pressure means for the temperature sensor, but can simultaneously also form an electrical connection through which the respective electrical sensor connection of the temperature sensor is electrically connected to the associated sensor contact of the connector. A mechanical attachment of the temperature sensor to the metal spring arm can be realized by a solder joint connecting the sensor connection to the sensor contact, which also establishes the electrical contact.

[0017] The temperature sensor can be designed as an electrical SMD component as an alternative to a discrete electrical component. The SMD component can be mounted on a flexible circuit board and electrically contacted, wherein the flexible circuit board has a first electrical circuit board connection and a second electrical circuit board connection, and the connector has a first sensor contact that is contacted to the first electrical circuit board connection and a second sensor contact that is contacted to the second electrical circuit board connection, wherein the temperature sensor and the flexible circuit board are connected to the connector housing of the connector by means of a fixed mounting of the first sensor contact and the second sensor contact in the connector housing. Since the flexible circuit board generally does not have sufficiently high spring-elastic properties, i.e.is too soft to generate sufficient clamping force to press the temperature sensor against the heating wall, a separate spring arm can be provided on the connector, which supports the flexible circuit board at least in the area of the temperature sensor and presses it against the heating wall.

[0018] In all embodiments of the invention, where appropriate, the sensor body can be adhered to the heater wall using a thermally conductive adhesive. The thermally conductive adhesive can, on the one hand, form a fastening means that mechanically fixes the sensor body to the heater wall. On the other hand, the thermally conductive adhesive can form a thermally conductive body that improves the thermal conductivity properties and improves heat transfer from the heater wall to the sensor body, in particular by increasing the contact area between the heater wall and the sensor body. This can be particularly appropriate due to a convex shape of the heater wall and / or the sensor body.

[0019] The heating wall can generally be formed by a steel pipe section with a circular cross-section. The connector can have a metal tab, and the connector can be attached to the steel pipe section by a soldered or welded connection of the metal tab to the first surface of the heating wall.

[0020] For this purpose, the plug housing can, for example, have a locking pocket into which a fastening tongue of the metal tab is positively inserted. The welding tongue can be soldered or welded to the first surface of the heating wall by means of a soldering or welding point. A second or alternative metal tab can also form an electrical ground connection. For this purpose, this second metal tab also has a welding tongue, which can be soldered or welded to the first surface of the heating wall by means of a soldering or welding point. Instead of a fastening tongue, however, the second metal tab then has an electrical ground contact. By means of the first metal tab and / or the second metal tab, the plug connector or the plug housing of the plug connector is fastened to the heating wall or to the steel pipe section by means of a soldered or welded connection to the first surface of the heating wall.

[0021] The water-conducting household appliance, in particular the dishwasher, can have a heating pump with a pump housing in which a pump chamber is formed, in which a rotationally driven pump wheel is arranged, wherein the pump chamber has a chamber wall section formed by the heating wall.

[0022] The pump chamber can be delimited by an annular chamber wall section. The annular chamber wall section can have an inner surface facing the pump chamber, i.e., the water or the rinsing liquid. The annular chamber wall section can have an outer surface on an outer side opposite the inner surface. The heating device is thermally coupled to the chamber wall section. The heating device has a resistive thick-film heating device. The resistive thick-film heating device can be applied to the outer surface of the annular chamber wall section and cured there.

[0023] The steel pipe section, in particular a stainless steel pipe section, can be made from a flat steel strip bent into a circular tube shape, in which the end edges abutting in the circular tube shape are welded together. Alternatively, the steel pipe section, in particular the stainless steel pipe section, can be rolled as a seamless circular tube. The chamber wall section can, in particular, be designed to be electrically conductive. An electrical ground connection can be welded or soldered to the chamber wall section, in particular to the steel pipe section or stainless steel pipe section.

[0024] The heating pump can be a circulation pump and can be designed to circulate washing liquid, in particular tap water containing a cleaning agent, within a washing tub of the household dishwasher by sucking the washing liquid from a sump and spraying it onto the dishes to be washed via one or more washing liquid spray devices. In order to be able to treat the dishes with warm washing liquid, the circulation pump has the heating device, which is designed to heat the washing liquid as it is pumped through the heating pump. The heating pump is usually connected to a control device so that, in addition to the heating temperature or heating output, the flow rate or flow rate of the washing liquid can also be controlled and / or regulated, for example by changing the speed of a motor driving the circulation pump.

[0025] Specific embodiments of the invention are explained in more detail in the following description with reference to the accompanying figures. Regardless of the specific context in which they are mentioned, specific features of these embodiments may represent general features of the invention, even when considered individually or in combination.

[0026] They show: Fig. 1 a perspective view of a household dishwasher as an example of a water-conducting household appliance, Fig. 2 a sectional view of a heating pump of the household dishwasher according to Fig. 1, which is designed to circulate water or a rinsing solution, Fig. 3 a perspective partial view of a heating device according to the invention with a connector having a temperature sensor, Fig. 4 a perspective view of a first embodiment of the connector in isolation in a view from above, Fig. 5 a perspective view of the connector according to the first embodiment in isolation in a view from below, Fig. 6 an enlarged partial view of the connector according to Fig. 5 in the area of two temperature sensors, Fig. 7 an enlarged partial sectional view of the connector according to Fig. 4 and Fig. 5 in the area of a temperature sensor, Fig. 8 an enlarged partial sectional view of the connector according to Fig. 4 and Fig. 5 in the area of a sensor body glued to a heating wall, Fig. 9 is a perspective view of a device according to the first embodiment Fig. 5 modified second embodiment of a connector according to the invention, Fig. 10 a perspective view of three metal spring arms of the connector according to the second embodiment with two temperature sensors in SMD design in isolation, Fig. 11 is a perspective view of a third embodiment of a connector according to the invention with a flexible printed circuit board in a view from above, Fig. 12 a perspective view of the flexible printed circuit board according to Fig. 11 in a unique position in a view from above, Fig. 13 a perspective view of the third embodiment of the connector according to the invention with the flexible printed circuit board in a view from below, Fig. 14 a perspective view of the flexible printed circuit board according to Fig. 13 in a unique position in a view from below, Fig. 15 is a perspective view of a fourth embodiment of a connector according to the invention with a flexible printed circuit board in a view from above, Fig. 16 a perspective view of the fourth embodiment of the connector according to the invention with the flexible printed circuit board according to Fig. 15 in a view from below, Fig. 17 a sectional view through a connector according to the invention in the area of an exemplary electrical contact, and Fig. 18 a perspective view of an electrical contact according to Fig. 17 in unique position.

[0027] The Fig. 1 shows a household dishwasher 1a as an example of a water-conducting household appliance 1 with a washing tub 2 in which an upper basket 3 and a lower basket 4 are extendably mounted. An upper washing liquid spray device 5 is rotatably mounted below the upper basket 3, and a lower washing liquid spray device 6, in the present embodiment each in the form of a spray arm, is rotatably mounted below the lower basket 4. The lower washing liquid spray device 6 is supplied with washing liquid via a lower supply line 8, and the upper washing liquid spray device 5 is supplied with washing liquid via an upper supply line 7. A sump 9 with a sieve insert 10 is formed at the bottom of the washing tub 2, in which a heating pump 11 is arranged. The heating pump 11 is connected to the upper supply line 7 and the lower supply line 8.The heating pump 11 is designed to circulate washing liquid, in particular tap water containing a cleaning agent, within the washing container 2 by sucking the washing liquid from the sump 9 and spraying it onto the dishes to be washed in the baskets 3, 4 via the washing liquid spray devices 5, 6. In order to be able to treat the dishes with warm washing liquid, the heating pump 11 has a heating device 12 (. Fig. 2) which is designed to heat the rinsing liquid when it is pumped by the heating pump 11. The heating pump 11 is connected to a control device 13, so that in addition to the heating temperature or the heating power, the delivery rate or the delivery speed of the rinsing liquid can also be controlled, for example by changing the speed of an electric motor 14 ( Fig. 2) can be operated in a controlled and / or regulated manner.

[0028] In the Fig. 2, the exemplary heating pump 11 is shown in a longitudinal section. The heating pump 11 has a pump housing 15. The pump housing 15 includes, among other things, a pump chamber 16. A pump impeller 17 is rotatably mounted in the pump chamber 16. For its rotatable support, the pump impeller 17 is seated on a shaft 18 of the electric motor 14. The pump impeller 17 is designed to suck in a fluid, in particular a liquid, such as water or the rinsing liquid in the household dishwasher 1a, via an axial intake port 19 of the pump housing 15 arranged concentrically to the shaft 18 and to expel it again via a tangentially extending outlet port 20 of the pump housing 15. In the pump chamber 16, the water, in particular the rinsing liquid, is heated by the heating device 12.

[0029] In the Fig. 3 shows a first embodiment of the heating device 12. The heating device 12 has a heating wall 21. In the present embodiment, the heating wall 21 is formed by a steel pipe section with a circular cross-section, in particular a stainless steel pipe section. The heating wall 21 has a first surface 21.1 provided with at least one electrical resistance thick-film heating device 22. Furthermore, the heating wall 21 has a second surface 22.2 opposite the first surface 21.1, which forms a contact surface designed to thermally conduct the heat generated by the electrical resistance thick-film heating device 22 into the water to be heated.The heating wall 21 can be formed by bending a flat steel sheet strip into the circular steel pipe piece and soldering or welding the two butt-fitting ends of the steel sheet strip together to form a seam 23.

[0030] The heating device 12 has an electrical connector 24 according to the invention. The connector 24 has a connector housing 25 and a plurality of electrical contacts 26 arranged in the connector housing 25, of which at least two electrical contacts 26.1 and 26.2 are electrically connected to terminal ends 27 of the electrical resistance thick-film heating device 22. The connector 24 also has at least one, in the case of the present embodiment, two, temperature sensors 28.1, 28.2.

[0031] The plug connector 24 has a first metal tab 29.1. The first metal tab 29.1 has a fastening tab 30 and a welding tab 31. The first metal tab 29.1 is fastened to the connector housing 25 by means of the fastening tab 30. For this purpose, the connector housing 25 has a locking pocket 32 into which the fastening tab 30 of the first metal tab 29.1 is positively inserted. The welding tab 31 is soldered or welded to the first surface 21.1 of the heater wall 21 by means of a soldering or welding point 33. A second metal tab 29.2 also forms an electrical ground connection. For this purpose, the second metal tab 29.2 also has a welding tongue 31, which is soldered or welded to the first surface 21.1 of the heater wall 21 by means of a soldering or welding point 33. However, instead of a fastening tongue 30, the second metal tab 29.2 has the electrical ground contact 26.3. The first metal tab 29.1 and the second metal tab 29.2, the connector 24 or the connector housing 25 of the connector 24 is attached to the heater wall 21 or to the steel pipe section by a soldered or welded connection to the first surface 21.1 of the heater wall 21. The heater wall 21 forms a chamber wall section of the pump chamber 16 of the heating pump 11.

[0032] As in the first embodiment, in particular in Fig. 6, each temperature sensor 28.1, 28.2 has a sensor body 34, a first electrical sensor terminal 35.1 and a second electrical sensor terminal 35.2.

[0033] As in the first embodiment, in particular in Fig. As shown in Figure 4, the connector 24 has a first sensor contact 36.1, a second sensor contact 36.3, and a third sensor contact 36.3. The first electrical sensor terminal 35.1 of the first temperature sensor 28.1 is electrically connected to the third sensor contact 36.3, the first electrical sensor terminal 35.1 of the second temperature sensor 28.1 is electrically connected to the first sensor contact 36.1, and the two second electrical sensor terminals 35.2 of both the first temperature sensor 28.1 and the second temperature sensor 28.2 are electrically connected to each other at the common second sensor contact 36.3.

[0034] The connector housing 25 of the connector 24 has a holder 37 for each sensor body 34 of the two temperature sensors 28.1, 28.2. Each sensor body 34 is attached to its respective holder 37.

[0035] In the case of the first embodiment according to Fig. 3 to Fig. 8, the holder 37 is resiliently mounted on the connector 24 or on the connector housing 25 of the connector 24, as shown in particular in Fig. 8, such that, in an arrangement of the connector 24 fastened to the heating wall 21, the sensor body 34 is pressed against the heating wall 21, in particular against the first surface 21.1 of the heating wall 21, by means of the spring-loaded holder 37. As shown, the sensor body 34 can additionally be glued to the heating wall 21 by means of a heat-conducting adhesive 38.

[0036] The holder 37 has in the case of the first embodiment according to Fig. 3 to Fig. 8, a holding section 37.1 to which the sensor body 34 is fastened, and the holder 37 has a spring-elastic connecting section 39 that flexibly connects the holding section 37.1 to the connector housing 25. The holding section 37.1 can have two opposing holding jaws, between which the sensor body 34 is positively received and held. The spring arm 37.2 can have an arcuate connecting section 39. The spring arm 37.2 is in the case of the first embodiment according to Fig. 3 to Fig. 8 a plastic spring arm, which together with the holding section 37.1 and the plug housing 25 can be formed as a one-piece plastic component.

[0037] In the case of the second embodiment according to Fig. 9 and Fig. 10, the spring arm 37.2 is an electrically conductive metal spring arm, which, together with the first sensor contact 36.1 or together with the second sensor contact 36.2 or the third sensor contact 36.3, is formed as a one-piece metal spring clip component. In this second embodiment, the temperature sensor 28.1, 28.2 is also formed as an electrical SMD component 40. The SMD component 40 comprises a central cuboid element, which forms the sensor body 34, and two opposing metallic, i.e. electrically conductive, end plates, which form the first electrical sensor connection 35.1 and the second electrical sensor connection 35.2. The first electrical sensor connection 35.1 is soldered to the first sensor contact 36.1, and the second sensor connection 35.2 is soldered to the second sensor contact 36.2. The three sensor contacts 36.1-36.3 form an electrically separated group of sensor contacts, with the second sensor contact 36.2 forms a common connection for the two temperature sensors 28.1 and 28.2. The group of sensor contacts 36.1-36.3 is positively inserted into the connector housing.

[0038] In the case of the third embodiment according to Fig. 11 to Fig. 14, the two temperature sensors 28.1 and 28.2, i.e. the two SMD components 40, are mounted on a flexible circuit board 41 and electrically contacted by means of flexible conductor tracks 43. The flexible circuit board 41 has a first electrical circuit board connection 42.1, a second electrical circuit board connection 42.2 and a third electrical circuit board connection 42.3. The first sensor contact 36.1 is contacted to the first electrical circuit board connection 42.1. The second sensor contact 36.2 is contacted to the second electrical circuit board connection 42.2. The third sensor contact 36.3 is contacted to the third electrical circuit board connection 42.3. By means of a fastened mounting of the three sensor contacts 36.1 to 36.3 in the connector housing 25, the two temperature sensors 28.1 and 28.2 orThe two SMD components 40, together with the flexible circuit board 41, are connected to the connector housing 25 of the connector 24. The flexible circuit board 41 can be provided with an adhesive or a self-adhesive layer on the side facing the heating wall 21 in order to attach the flexible circuit board 41 to the heating wall 21 in such a way that the two temperature sensors 28.1 and 28.2, or the two SMD components 40, are pressed against the first surface 21.1 of the heating wall 21.

[0039] In the case of the fourth embodiment according to Fig. 15 and Fig. 16, the two temperature sensors 28.1 and 28.2, i.e., the two SMD components 40, are mounted on a flexible circuit board 41a and electrically contacted by means of flexible conductor tracks 43a. The flexible conductor tracks 43a are contacted to a first electrical circuit board terminal 42.1, a second electrical circuit board terminal 42.2, and a third electrical circuit board terminal 42.3. In contrast to the third exemplary embodiment, however, the three circuit board terminals 42.1, 42.2, and 42.3 are not arranged on the flexible circuit board 41a, but rather they are located on a separate fixed circuit board 41b, and the flexible conductor tracks 43a of the flexible circuit board 41a are soldered to the circuit board terminals 42.1, 42.2, and 42.3 of the fixed circuit board 41b. Since the fixed circuit board 41b is rigid, it can be inserted like a plug-in card into at least one slot 44 of the connector housing 25 in order to connect the two temperature sensors 28.1 and 28.2 or the two SMD components 40 together with the flexible circuit board 41a to the plug housing 25 of the plug connector 24. Here too, the flexible circuit board 41a can be provided with an adhesive or a self-adhesive layer on that side of the flexible circuit board 41a which faces the first surface 21.1 of the heating wall 21 in the installed position in order to fasten the flexible circuit board 41a to the heating wall 21 in such a way that the two temperature sensors 28.1 and 28.2, ie the two SMD components 40, are pressed against the first surface 21.1 of the heating wall 21, as is shown in particular in FIG. Fig. 15 is shown.

[0040] In all versions, according to Fig. 17 and Fig. 18, a contact shoe 45 rests under spring preload in a merely touching manner on the first connection end 27.1 and / or a further contact shoe 45 rests in a merely touching manner on the second connection end 27.2. The contact shoe 45 is connected to the electrical contact 26.1, 26.2 by means of a connecting bridge 46. The connecting bridge 46 has a resilient section 46.1, which in the case of the present exemplary embodiment is designed as a leg section 46.2 with a U-shaped cross section. The connecting bridge 46 therefore has a resilient section 46.1, which is designed to compensate for a change in position of the connection end 27.1, 27.2 occurring perpendicular to the contact surface of the connection end 27.1, 27.2 of the electrical resistance thick-film heating device 22. In the case of the present embodiment, the plug housing 25 also has a housing niche 48 and the spring-elastic section 46.1 orthe leg section 46.2 of the connecting bridge 46, which is U-shaped in cross section, is arranged in this housing niche 48.

[0041] The connecting bridge 46 is a metal connecting bridge which has a first bridge end 46a which is electrically and mechanically connected to the electrical contacts 26.1, 26.2 and which has a second bridge end 46b which is electrically and mechanically connected to the contact shoe 45, wherein the contact shoe 45 is electrically connected to the electrical contacts 26.1, 26.2 via the metal connecting bridge.

[0042] The contact shoe 45 is, as particularly shown in Fig. 17, is designed as a sliding contact that is displaceable relative to the connection end 27.1, 27.2 of the electrical resistance thick-film heating device 22, and in order to exert a contact force that establishes the electrical connection, the contact shoe 45 is resiliently mounted on the plug housing 25, specifically by a mechanical fastening of the electrical contact 26.1, 26.2 in the plug housing 25.

[0043] As particularly in Fig. 18, the contact shoe 45 can have several, in the present embodiment three, separately resilient contact tongues 47. The connecting bridge 46 can, as in particular in Fig. 18, together with the contact shoe 45 and the electrical contacts 26.1, 26.2, may be formed as a one-piece bent sheet metal part. LIST OF REFERENCE SYMBOLS 1 water-conducting household appliance 1a household dishwasher 2 rinsing containers 3 Upper basket 4 Lower basket 5 Upper rinsing liquid spray device 6 Lower rinsing liquid spray device 7 Upper supply line 8 Lower supply line 9 Swamp 10 sieve insert 11 Heating pump 12 Heating device 13 Control device 14 electric motor 15 Pump housing 16 Pump chamber 17 Pump wheel 18 Wave 19 intake manifold 20 outlet nozzles 21 Heating wall 21.1 first surface 21.2 second surface 22 Resistance thick-film heating device 23 Seam 24 connectors 25 connector housings 26, 26.1, 26.2 electrical contacts 26.3 Ground contact 27 connection ends 28.1,28.2 Temperature sensors 29.1 first metal tab 29.2 second metal tab 30 fastening tongue 31 Welding tongue 32 rest pocket 33 Welding point 34 sensor body 35.1 first electrical sensor connection 35.2 first electrical sensor connection 36.1 first sensor contact 36.2 second sensor contact 36.3 third sensor contact 37 holders 37.1 Holding section 37.2 Spring arm 38 Adhesive 39 connecting section 40 SMD components 41, 41a flexible circuit board 41b fixed circuit board 42.1 first electrical circuit board connection 42.2 second electrical circuit board connection 42.3 third electrical circuit board connection 43, 43a flexible conductor tracks 44 slot 45 contact shoe 46 connecting bridge 46.1 spring-elastic section 46.2 U-shaped leg section 46a first bridge end 46b second bridge end 47 contact tongues 48 housing niche

Claims

[1] Water-conducting household appliance, comprising a heating device (12) with at least one temperature sensor (28.1, 28.2) and a heating wall (21) which has a first surface (21.1) which is provided with at least one electrical resistance thick-film heating device (22) and which has a second surface (21.2) opposite the first surface (21.1) which forms a contact surface which is designed to thermally conduct the heat generated by the electrical resistance thick-film heating device (22) into the water to be heated, wherein the heating device (12) also has an electrical plug connector (24) which has a plug housing (25) and a plurality of electrical contacts (26, 26.1, 26.2) arranged in the plug housing (25), of which at least two electrical contacts (26.1, 26.2) are electrically connected to connection ends (27) of the electrical resistance thick-film heating device (22), wherein the plug connector (24) has the at least one temperature sensor (28.1, 28.2) which has a sensor body (34), a first electrical sensor connection (35.1) and a second electrical sensor connection (35.2), wherein the plug connector (24) has a first sensor contact (36.1), a second sensor contact (36.2) and a holder (37), and the first electrical sensor connection (35.1) is contacted to the first sensor contact (36.1), the second electrical sensor connection (35.2) is contacted to the second sensor contact (36.2), and the sensor body (34) is fastened to the holder (37), the holder (37) being resiliently mounted on the plug connector (24) in such a way that, when the plug connector (24) is fastened to the heating wall (21), the sensor body (34) is pressed against the heating wall (21) by means of the resiliently mounted holder (37), the holder (37) having a holding section (37.1) to which the sensor body (34) is fastened, and the holder (37) having a spring arm (37.2) flexibly connecting the holding section (37.1) to the plug housing (25), and the spring arm (37.2) being an electrically conductive metal spring arm and, together with the first electrical sensor connection (35.1) or, respectively, together with the second electrical sensor connection (35.2), forming a one-piece metal spring clip component. [2] Water-conducting household appliance according to claim 1, characterized byin that the temperature sensor (28.1, 28.2) is designed as an electrical SMD component which is mounted on a flexible printed circuit board (41, 41a) and is electrically contacted, wherein the flexible printed circuit board (41, 41a) has a first electrical printed circuit board connection (42.1) and a second electrical printed circuit board connection (42.2), and the plug connector (24) has a first sensor contact (36.1) which is contacted to the first electrical printed circuit board connection (42.1) and a second sensor contact (36.2) which is contacted to the second electrical printed circuit board connection (42.2), wherein by means of a fixed mounting of the first sensor contact (36.1) and the second sensor contact (36.2) in the plug housing (25), the temperature sensor (28.1, 28.2) and the flexible printed circuit board (41, 41a) are connected to the plug housing (25) of the plug connector (24). [3] Water-conducting household appliance according to one of claims 1 or 2, characterized bythat the sensor body (34) is glued to the heating wall (21) by means of a heat-conducting adhesive (38). [4] Water-conducting household appliance according to one of claims 1 to 3, characterized by that the heating wall (21) is formed by a steel pipe section with a circular cross-section, the plug-in connector (24) has a metal tab (29.1, 29.2) and the plug-in connector (24) is fastened to the steel pipe section by a soldered or welded connection of the metal tab (29.1, 29.2) to the first surface (21.1) of the heating wall (21). [5] Water-conducting household appliance according to one of claims 1 to 4, comprising a heating pump (11) with a pump housing (15) in which a pump chamber (16) is formed, in which a rotationally driven pump wheel (17) is arranged, wherein the pump chamber (16) has a chamber wall section formed by the heating wall (21).

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