Hold-down device for holding down a measuring sensor and transmitting an electrical measuring signal

Abstract

Fluid-carrying assembly (16) for a domestic appliance (100), in particular a continuous flow heater, hot water system, drinking water heat pump, small storage tank, wall storage tank, standing storage tank and / or boiling water appliance, with - a fluid-conducting component (15) with a fluid-conducting component line section (17) extending through the component (15), which has a connection on each of the opposite sides for connection to a respective fluid-conducting line (9, 10, 11); - a measuring sensor (21) which projects at least partially into the component line section (17); - a hold-down device (23) electrically conductively connected to the measuring sensor (21) for forwarding an electrical measuring signal between the measuring sensor (21) and a control device (3) of the domestic technology device (100), wherein the hold-down device (23) has a hold-down section (23a) for holding down the measuring sensor (21) and forming an electrically conductive connection with the measuring sensor (21) and a connecting section (23b) electrically conductively connected to the hold-down section (23a) for closing an electrical connection with the control device (3).

Description

[0001] The invention relates to a fluid-conducting assembly for a domestic appliance, in particular a continuous-flow water heater, comprising a fluid-conducting component with a fluid-conducting component line section extending through the component, which has a connection on opposite sides for connection to a respective fluid-conducting line; and a measuring sensor projecting at least partially into the component line section.

[0002] Fluid-conducting domestic appliances include, for example, instantaneous water heaters, which are used to generate hot water using, in particular, electrical energy. Such an instantaneous water heater comprises one or more electrical heating elements, with which a fluid, typically water, conveyed through channels in the instantaneous water heater can be heated to a desired, preset temperature depending on the electrical power supplied to the heating elements. Instantaneous water heaters supply hot water without standby losses because they only heat water when hot water is needed. Although the above has been described with reference to instantaneous water heaters, the teaching of the invention is analogously applicable to other fluid-conducting domestic appliances.

[0003] Modern instantaneous water heaters are equipped with either a bare-wire heating element or a metal-sheathed heating element. The potential difference between the bare wire and the water inlet and outlet channels, which are electrically connected to earth potential, leads to corresponding leakage currents during operation of the heating device. Accordingly, leakage paths are provided to prevent excessive electrical leakage currents at the water inlet and outlet connections, which are connected to earth potential. The magnitude of these leakage currents depends, among other things, on the conductivity of the water flowing through the channels. Furthermore, with a bare-wire heating element system, there is a risk of the wire element overheating if air bubbles enter the device with the water.

[0004] DE 28 03 951 A1 describes an electric instantaneous water heater, wherein two electrodes are arranged in the channel, the distance between which forms a resistance path, so that a direct voltage derived from the mains voltage of the radiator is applied to the electrodes and that one electrode is connected to an electronic comparison circuit which emits a switch-off signal when the resistance value falls below a minimum value.

[0005] DE 10 2014 000 536 A1 shows an invention which proposes a measuring device for detecting an electrical conductivity of water in an electric instantaneous water heater.

[0006] WO 2004 / 048 676 A1 describes a conductivity sensor for washing water, an installation structure of the conductivity sensor and a method for controlling the washing machine.

[0007] Document EP 1 690 971 A2 describes a heating device for a washing machine or dishwasher. The heating device is provided in a water conduit, comprising at least one heating element and mounted in an opening in the wall of the water conduit by means of a holder. A conductivity measuring device is also arranged on the holder and extends into the water conduit. The heating device and conductivity measuring device form a single structural unit.

[0008] In order to monitor and control compliance with a specified leakage current limit, EP 2 840 404 B1 proposes a control device comprising an evaluation unit configured to determine a hypothetical leakage current value based on the conductivity value and at least one specified, design-related device parameter, and adapted to reduce the heating power of the bare wire heating device if the hypothetical leakage current value exceeds a specified leakage current threshold. By determining the hypothetical leakage current value, it is possible to precisely determine the leakage current actually flowing to earth as a function of the conductivity value and the device parameter, and only if the specified leakage current threshold is exceeded can the leakage current actually flowing to earth be reduced by reducing the heating power of the bare wire heating device.However, the document does not address the question of how a measuring sensor can be attached.

[0009] The object underlying the present invention is therefore to provide a fluid-carrying assembly for a domestic appliance, in particular an electric instantaneous water heater for hot water preparation, of the aforementioned type, which enables an advantageous, in particular simple and cost-effective, fastening of the measuring sensor to the domestic appliance and an advantageous, in particular simple and cost-effective, electrical connection of the measuring sensor to a control device of the domestic appliance.

[0010] According to the invention, this object is achieved in that the fluid-conducting assembly has a hold-down device which is electrically conductively connected to the measuring sensor for transmitting an electrical measuring signal between the measuring sensor and the control device of the domestic appliance, wherein the hold-down device has a hold-down section for holding down the measuring sensor and forming an electrically conductive connection with the measuring sensor and a connecting section which is electrically conductively connected to the hold-down section for closing an electrical connection with the control device.

[0011] Particularly noteworthy is the advantage provided by the assembly according to the invention: the retainer allows for the measurement sensor to be attached to the assembly while simultaneously ensuring a stable electrical connection between the measurement sensor and the control device. This fulfills both requirements in a simple and cost-effective manner.

[0012] The domestic appliance is or includes in particular at least one appliance selected from the following list: an instantaneous water heater, a hot water system, a drinking water heat pump, a small storage tank, a wall-mounted storage tank, a free-standing storage tank and / or a boiling water appliance.

[0013] According to a preferred embodiment of the invention, the hold-down section has openings for the passage of the measuring sensor, which is configured as two spaced-apart electrodes. The hold-down section, in particular the openings, and the outer surface of the electrodes are adapted to one another in such a way that a force-fitting, form-fitting, and / or material-fitting connection exists between the hold-down section and the measuring sensor.

[0014] Preferably, an annular inner edge of the opening defined by the opening can engage in a locking manner in an annular notch arranged in an area between a lower section and an upper section of the electrodes and can be supported against the notch by an elastic spring force. The elastic spring force can be realized by two spring legs extending from the inner edge of the opening in opposite directions into the hold-down device. Alternatively or additionally, an upper electrode section can be provided with a thread so that a material projection arranged in the lower electrode section (e.g., the diameter or circumference can be larger than the opening in the hold-down section in at least part of the lower electrode section) can be clamped against an underside of the hold-down device by means of a fastening nut.

[0015] According to a further preferred embodiment of the invention, the hold-down device has a fastening section and / or the fluid-conducting component has fastening means for fastening, in particular for holding down, the hold-down device to the fluid-conducting component. One possible fastening option is a fastening means that can be fixed to the component through an opening arranged in the fastening section, such as a screw that can be screwed into a thread provided in the component as a fastening means. This not only allows the measuring sensor to be fixed in the measuring section, but also provides a fastening point for the electrical cable leading to the control device. As a further possible fastening option, the hold-down device and the component are designed such that the hold-down device can be partially pushed by the measuring sensor into a substantially U-shaped material projection provided on the component.However, it should be noted that the present invention is not limited to specific embodiments of the hold-down, but in particular a clipping, locking or bayonet closure can also be used to lock the measuring sensor.

[0016] According to a further preferred embodiment of the invention, the hold-down device is constructed in two parts, and each hold-down part has a hold-down section for holding down and contacting a respective electrode of the measuring sensor configured as two spaced-apart electrodes, and a respective connecting section electrically connected to the hold-down section for establishing a respective electrical connection to the control device. In this embodiment, the measuring sensor can be understood as an assembly having two electrodes. This embodiment is characterized by its simplicity and the fact that no particularly high demands are placed on the manufacturing accuracy of the hold-down parts.

[0017] The design provides a defined distance between the two electrodes in the component of the home automation device. For example, if the component is manufactured using injection molding, the position of the electrodes in the component is precisely defined without requiring any special precision for the retaining parts. The defined distance between the electrodes can reduce measurement inaccuracies and eliminates the need for calibration of a resistance threshold, for example, for conductance measurement.

[0018] According to an alternative embodiment of the invention, the hold-down device is formed in one piece and has two hold-down sections, each with a hold-down section for holding down and contacting a respective electrode of the measuring sensor configured as two spaced-apart electrodes, and each with a connecting section electrically conductively connected to the hold-down section for establishing a respective electrical connection to the control device. In this embodiment, the hold-down device preferably has or consists of a printed circuit board, so that the two electrically separated hold-down sections can be implemented, in particular by the non-conductive printed circuit board. This embodiment is characterized by its simplicity and the fact that only one component is required for holding down and contacting two electrodes.Furthermore, the electrical connection to the control device can be made via only one (two-pin) plug.

[0019] According to a further preferred embodiment of the invention, the component is made of a non-conductive material. This eliminates the need for electrical insulation of the electrically conductive areas of the hold-down device from the component. The component is, for example, a flange of the domestic appliance, into which the hold-down device according to the invention and optionally other components, for example for conductivity measurement, are screwed or attached.

[0020] According to a further preferred embodiment of the invention, the component is designed as a flange having a connection to a pipeline on one side and a connection to a heating line section on an opposite side. The pipeline is preferably a hot water pipeline. This means that the measuring sensor is arranged in a downstream section, allowing the measuring sensor to detect the measurement signal in a section where the most critical (highest) conductivity is expected. Other flange variants, for example, with a connection to a cold water pipe or flanges that include heating line sections on both sides, are also possible.

[0021] According to a further preferred embodiment of the invention, the connecting section is designed as an elongated flat piece. The elongated flat piece is shaped, for example, for connection to a flat plug sleeve or a snap-in connector. This results in a plug connection that can be easily removed in the event of repair, maintenance, or the like.

[0022] Particularly preferably, the measuring sensor is designed as two electrodes spaced apart from one another. The electrodes are preferably designed as two electrodes spaced transversely to the flow channel of the component line section. The arrangement, in particular transversely, i.e., optionally with a longitudinal component in the direction of the flow channel, or orthogonally, i.e., at right angles to the flow channel, results in lower pressure losses in the flow channel. This is relevant to flow, particularly with regard to laminar or turbulent flow, especially with small channel cross-sections.

[0023] In principle, the electrodes can be formed from any electrically conductive and water-carrying component. Particularly preferably, the electrodes are drinking water-compliant in the field of instantaneous water heaters. These can, in particular, be selected from the group consisting of heating bolts, temperature sensors, measuring probes, inlet and / or outlet pipes, cooling pipes, locking clips, locking clips, pressure sensors, engine valve spindles, screws, and throttle screws. In principle, it is possible for at least one electrode to be formed by the heating element. However, the heating element is preferably not part of the measuring sensor, and in addition to the heating element, two electrodes are provided for detecting the resistance value. With regard to drinking water-compliant materials, stainless steel is particularly worth mentioning due to its ease of procurement, corrosion resistance, resistance to fouling or limescale deposits, and organic effects.Furthermore, metal-coated, anodized, chrome-plated and nickel-plated materials such as metals, plastics, non-ferrous metals and sintered materials are conceivable.

[0024] Furthermore, it is preferred that the measuring device be operated with low alternating current, preferably safety extra-low voltage. This reduces undesirable electrolysis effects on the measuring device, particularly on the electrodes. To minimize disruptive polarization effects on the measuring device, particularly on the electrodes, it is further preferred that the measuring device be operated in the low-voltage range.

[0025] According to a further embodiment of the invention, a measuring section formed by the electrodes runs transversely to the flow direction. The measuring section formed by the electrodes represents the shortest connection within the fluid-carrying line between the electrodes. Preferably, the measuring section runs transversely, in particular orthogonally, to the flow direction. This prevents interference currents and minimizes flow influences and pressure losses.

[0026] The object underlying the invention is also achieved by a domestic appliance, in particular an instantaneous water heater, hot water system, drinking water heat pump, small storage tank, wall-mounted storage tank, free-standing storage tank and / or boiling water appliance, with a fluid-carrying line; a heating element extending over a heating line section for heating the fluid flowing through the line; a control device for controlling a heating output of the heating element for heating the fluid flowing through the line; and a fluid-carrying assembly connected to the fluid-carrying line as described here.

[0027] According to a preferred embodiment of the invention, the measuring sensor is designed to pick up a measuring signal characteristic of the conductivity of the fluid flowing through the fluid-carrying line, and the control device is preferably designed to control the heating power on the basis of the conductivity.

[0028] To protect the main electronics from interference effects (e.g. EMC, burst, surge effects), the control device preferably has a measuring circuit designed to determine the measuring signal and a heating circuit designed to control the heating power, and the measuring circuit is galvanically isolated from the heating circuit.

[0029] To avoid repetition, in connection with the domestic technology device according to the invention, reference is made to the previously made statements on the assembly, which also represent corresponding embodiments of the domestic technology device according to the invention.

[0030] The object underlying the invention is also achieved by using an electrically conductive hold-down device for holding down a measuring sensor and forwarding an electrical measuring signal between the measuring sensor, which projects at least partially into a fluid-carrying line of a domestic appliance, in particular a continuous flow heater, a hot water system, a drinking water heat pump, a small storage tank, a wall-mounted storage tank, a standing storage tank and / or a boiling water device, and a control device of the domestic appliance, wherein the hold-down device has a hold-down section for holding down the measuring sensor and forming an electrically conductive connection with the measuring sensor and a connecting section, which is electrically conductively connected to the hold-down section, for closing an electrical connection with the control device.

[0031] Preferably, the hold-down device and / or the domestic appliance, in particular the instantaneous water heater, is configured as described in more detail here. To avoid repetition, in connection with the use according to the invention, reference is made to the above statements regarding the assembly and the domestic appliance, which each also represent corresponding embodiments of the use according to the invention.

[0032] Further preferred and / or expedient features and embodiments of the invention will become apparent from the dependent claims and the description. The invention is described in more detail below using exemplary embodiments with reference to the accompanying figures. Similar or identical components are designated by the same reference numerals.

[0033] Here we show: Fig. 1 a schematic view of a preferred embodiment of a domestic appliance according to the invention; Fig. 2 a perspective view of a hot water outlet side flange of a preferred embodiment of a domestic appliance according to the invention; Fig. 3 the in Fig. 2 hot water outlet side flange shown in plan view; Fig. 4 a view of the hot water outlet side flange in section along the Fig. 3 shown level AA; Fig. 5 a perspective view of the Fig. 2 to 4 alone and in combination with other components of a preferred embodiment of the domestic appliance according to the invention; and Fig. 6 Partial views of further embodiments of a domestic appliance according to the invention in section and from above.

[0034] Fig. 1 shows a domestic appliance 100, in particular an electric instantaneous water heater, with a fluid-carrying line 9, 10, 11, in which a heating element 12 extends in a line section 9 for heating the fluid flowing through the line 9, 10, 11. Heating element 12 can be designed as a bare wire heating element or tubular heating element, preferably a bare wire heating element. The domestic appliance further comprises a cold water inlet 6 for connection to a water supply line and a hot water outlet 7. The hot water outlet 7 can be connected to a faucet via a hot water line (not shown). In particular, if the heating element 12 is a bare wire element, the line has an upstream section 10 and a downstream section 11 upstream and downstream of the heating element 12.These are unheated channels that serve as resistance paths for the high voltages present at the current-carrying heating element 12, preventing high leakage currents from flowing at the connections. When the cold water inlet 6 and hot water outlet 7 are properly connected to a protective conductor, the leakage current flows through the protective conductor.

[0035] According to the invention, the domestic appliance 100 comprises a fluid-carrying assembly 16, which in the present illustration is designed as a flange on the hot water outlet side. The assembly 16 comprises a measuring sensor 21 (preferably in Fig. 4), which is conductively connected to an electronic control device 3.

[0036] In this embodiment, the measuring sensor 21 has two electrodes 22, 22'. The measuring sensor 21, or the electrodes 22, 22', protrude, see. Fig. 2, at least partially into a component line section 17.

[0037] The measuring sensor 21 is preferably designed to detect a value of a parameter dependent on the conductivity of the fluid, in particular an electrical resistance or conductivity value. The control device 3 is configured to control a heating power of the heating element 12 for heating the fluid flowing through the line.

[0038] The home automation device 100 can further comprise one, several or the following Fig. 1 shown components optionally. - Inlet temperature sensor 4 and / or outlet temperature sensor 8, which can be arranged in a line section 10 leading to the heating element 12 (upstream section) or in a line section 11 leading away from the heating element 12 (downstream section); and / or - Flow sensor 2, which can be arranged in the line 9, 10, 11, e.g. in the upstream section 10; and / or - Valve 1 (in Fig. 1 shown as a motor-operated valve), which can be arranged in the upstream section 10; and / or - Control unit 5 for operating and / or maintaining the building services device 100.

[0039] Preferably, the aforementioned components (if present) are functionally coupled to the control device 3, so that the control device 3 controls the heating power of the heating element 12 and / or valve position of the valve 1 as a function of the flow rate and / or inlet and / or outlet temperature of the fluid and / or a desired (predetermined) hot water temperature.

[0040] Fig. 2 shows the assembly 16 with a component 15 designed as a hot water outlet-side flange, a holding-down device 23 and a measuring sensor 21 designed as an electrode 22, 22'. The holding-down device 23 is designed in two parts and has two holding-down parts 23', 23", which are fastened to the upper side of the housing of the component 15. In the example shown, the fastening of the holding-down parts 23', 23" is each by a Fig. 5 is achieved by a fastening element 26 (here: screw) passing through the fastening section 23c of the hold-down parts 23', 23" shown in more detail. The special feature of the structure is shown by the combination of holding down measuring electrodes and their electrical contact for the transmission of measuring signals.

[0041] Fig. 3 shows the assembly 16 from above. A sectional view through plane AA is shown in Fig. 4. In the Fig. 4A and in particular the section view shown in Fig. 4B, it can be seen that the component 15 has a cylindrical material recess extending from the surface for receiving a lower electrode section 22b and a thread extending from the same surface for fastening the hold-down device 23 or hold-down part 23' by means of a fastening element 26. Furthermore, electrodes 22, 22' in an upper electrode section 22a have a thread for clamping the lower electrode section 22b, which has a material projection, against the underside of the hold-down part 23', 23" by means of a lock nut 25. The electrodes 22, 22', which can also be referred to as measuring bolts, extend through the component 15 into the interior of the component line section 17, so that they are in contact with fluid flowing through the line 9.For sealing, the lower electrode section 22b is provided with circumferential seals (here, two O-rings). In this exemplary embodiment, the measuring pins extend into the line 9 forming the hot water channel, while in other embodiments, the lines 10, 11 can also be used in the same way.

[0042] A detailed representation of a hold-down part 23', 23" with a centrally arranged hold-down section 23a and a connecting section 23b and fastening section 23c arranged on opposite sides of the hold-down section 23a for fastening the hold-down part 23', 23" by means of the fastening element 26 is shown in Fig. 5. In this embodiment, an annular inner edge defined by the opening engages in a locking manner in an annular notch arranged in an area between a lower section 22b and an upper section 22a of the electrodes 22, 22' and is supported against the notch by the elastic spring force of two spring legs extending from the inner edge of the opening into the hold-down device. This achieves a force-fitting, form-fitting, and / or material-fitting connection between the hold-down part 23', 23" and the respective electrode 22, 22'. An additional lock nut for clamping the electrodes 22, 22' against the underside of the hold-down part 23', 23" can be dispensed with. To establish an electrical connection with the control device 3, the connecting section 23b of the hold-down parts 23', 23" is designed as an elongated flat piece for plugging into the flat receptacle 24.The connecting section 24b preferably extends opposite to the flow direction 14 of the hot water outlet (cf. . Fig. 2) in order, on the one hand, to keep a connected electrical cable away from heat-conducting metal pipes and, on the other hand, to guide the cable along a short route to the control device 3.

[0043] Fig. 6 shows partial views of further embodiments of an assembly 16 according to the invention in section and from above.

[0044] In Fig. 6A, the fastening of the hold-down device 23 to the component 15 is achieved by a fastening element 26 designed as a fastening bolt that engages positively in the component 15. The measuring sensor 21 is designed as two bolt-shaped electrodes 22, 22', one end of which projects into the component lead section 17. The electrodes 22, 22' have an annular collar 22d in a region between the upper electrode section and the lower electrode section, which, together with the hold-down device 23, prevents movement of the electrodes 22, 22' in the axial direction of the electrodes. The flat plug sleeve 24 can be used to establish an electrical connection with the control device 3 via the Fig. 6B not further specified connecting section 23b.

[0045] In Fig. 6B, the fastening of the hold-down device 23 to the component 15 is achieved in that the hold-down device 23 is urged by the electrode 22, 22' into a substantially U-shaped material projection 29 provided on the component side. The electrode 22, 22' is designed as a measuring bolt, one end of which projects into the component lead section 17. The electrodes 22, 22' have an upper electrode section and a lower electrode section which is wider than the upper electrode section and which can be clamped against the underside of the hold-down part 23', 23" by means of the lock nut 25, so that movement of the electrodes 22, 22' in the axial direction of the electrodes is prevented. The flat plug sleeve 24 can be used to establish an electrical connection with the control device 3 via the Fig. 6B not further specified connecting section 23b. It should be noted that other fastening options are also conceivable, for example, a connection without screwing as in Fig. 6A conceivable.

[0046] In the Fig. 6C, conductor tracks 23d for contacting electrodes 22, 22' projecting into the component lead section 17 are applied to a one-piece (circuit board) formed hold-down device 23. The electrical contact between hold-down device 23 and electrodes 22, 22' is preferably force-fitting, form-fitting, and / or material-fitting. The hold-down device 23 can be screwed, clipped, or latched to the component 15 by means of a fastening element 26. A latching plug for connection to the control device 3 can be connected to the hold-down device 23 formed as a circuit board (in Fig. 6C not shown). List of reference symbols: 1 Motorized valve 2 flow sensor 3 Control device 4 Inlet temperature sensor 5 Control panel 6 Cold water inlet 7 Hot water outlet 8 Outlet temperature sensor 9, 10, 11 Fluid-carrying line 12 Heating element 14 Flow direction of hot water outlet 15 component 16 assembly 17 Component line section 21 measuring sensor 22, 22' electrodes 22a Upper electrode section 22b Lower electrode section 22c lead wire 22d collar 23 hold-down clamps 23', 23" hold-down part 23a Hold-down section 23b connecting section 23c Fastening section 23d conductor track 24 flat receptacles 25 Lock nut 26 Fastening element 29 Material advantage 100 home automation devices

Claims

[1] Fluid-carrying assembly (16) for a domestic appliance (100), in particular a continuous flow heater, hot water system, drinking water heat pump, small storage tank, wall storage tank, standing storage tank and / or boiling water device, with - a fluid-conducting component (15) with a fluid-conducting component line section (17) extending through the component (15), which has a connection on each of the opposite sides for connection to a respective fluid-conducting line (9, 10, 11); - a measuring sensor (21) which projects at least partially into the component line section (17); - a hold-down device (23) electrically conductively connected to the measuring sensor (21) for forwarding an electrical measuring signal between the measuring sensor (21) and a control device (3) of the domestic technology device (100), wherein the hold-down device (23) has a hold-down section (23a) for holding down the measuring sensor (21) and forming an electrically conductive connection with the measuring sensor (21) and a connecting section (23b) electrically conductively connected to the hold-down section (23a) for closing an electrical connection with the control device (3). [2] Fluid-conducting assembly (16) according to claim 1, wherein the hold-down section (23a) has openings for the passage of the measuring sensor (21) designed as two spaced-apart electrodes (22, 22'). [3] Fluid-conducting assembly (16) according to claim 2, wherein the hold-down section (23a), in particular the openings, and a lateral surface of the electrodes (22, 22') are adapted to one another in such a way that a force-fitting, form-fitting and / or material-fitting connection exists between the hold-down section (23) and the measuring sensor (21). [4] Fluid-conducting assembly (16) according to one of the preceding claims, wherein the hold-down device (23) has a fastening section (23c) and / or the fluid-conducting component (15) has fastening means for fastening the hold-down device (23) to the fluid-conducting component (15). [5] Fluid-conducting assembly (16) according to one of the preceding claims, wherein the hold-down device (23) is formed in two parts and each hold-down part (23', 23") has a hold-down section (23a) for holding down and forming an electrically conductive connection with a respective electrode (22', 22") of the measuring sensor (21) designed as two spaced-apart electrodes and a respective connecting section (23b) electrically conductively connected to the hold-down section (23a) for closing a respective electrical connection with the control device (3). [6] Fluid-conducting assembly (16) according to one of claims 1 to 4, wherein the hold-down device (23) is formed in one piece and has two hold-down sections, each with a hold-down section (23a) for holding down and forming an electrically conductive connection with a respective electrode (22, 22') of the measuring sensor (21) designed as two spaced-apart electrodes, and each with a connecting section (23b) electrically conductively connected to the hold-down section (23a) for closing a respective electrical connection with the control device (3). [7] Fluid-conducting assembly (16) according to one of the preceding claims, wherein the component (15) is made of a non-conductive material. [8] Fluid-conducting assembly (16) according to one of the preceding claims, wherein the component (15) is designed as a flange (15) which has on one side a connection to a pipeline (10, 11), in particular a cold water pipeline and / or a hot water pipeline, and on an opposite side a connection to a heating line section (9). [9] Fluid-conducting assembly (16) according to one of the preceding claims, wherein the connecting section (23b) is formed as an elongated flat piece, preferably for connection to a flat plug sleeve (24) or a snap-in connector. [10] Fluid-conducting assembly (16) according to claim 1 or one of claims 3 to 9, wherein the measuring sensor (21) is designed as two electrodes (22, 22') spaced apart from one another, in particular as two electrodes (22, 22') formed transversely to the flow channel of the component line section (17). [11] Domestic appliance (100), in particular instantaneous water heater, hot water system, drinking water heat pump, small storage tank, wall storage tank, standing storage tank and / or boiling water device, with - a fluid-carrying line (9, 10, 11); - a heating element (12) extending over a heating line section (9) for heating the fluid flowing through the line (9, 10, 11); - a control device (3) for controlling a heating power of the heating element (12) for heating the fluid flowing through the line; and - a fluid-carrying assembly (16) according to one of the preceding claims connected to the fluid-carrying line (9, 10, 11). [12] Domestic appliance (100), in particular a continuous flow heater, according to claim 11, wherein the measuring sensor (21) is designed to pick up a measuring signal characteristic of the conductivity of the fluid flowing through the fluid-carrying line (9, 10, 11), and the control device (3) is preferably designed to control the heating power on the basis of the conductivity. [13] Use of an electrically conductive hold-down device (23) for holding down a measuring sensor (21) and forwarding an electrical measuring signal between the measuring sensor (21) projecting at least partially into a fluid-carrying line (9, 10, 11) of a domestic appliance (100), in particular a continuous-flow heater, a hot water system, a drinking water heat pump, a small storage tank, a wall-mounted storage tank, a standing storage tank and / or a boiling water device, and a control device (3) of the domestic appliance (100), wherein the hold-down device (23) has a hold-down section (23a) for holding down the measuring sensor (21) and forming an electrically conductive connection with the measuring sensor (21) and a connecting section (23b) electrically conductively connected to the hold-down section (23a) for closing an electrical connection with the control device (3).

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