CN106988399B

CN106988399B - Flushing toilet with water heater

Info

Publication number: CN106988399B
Application number: CN201611272986.3A
Authority: CN
Inventors: S·巴赫曼
Original assignee: Geberit International AG
Current assignee: Geberit International AG
Priority date: 2015-11-18
Filing date: 2016-11-18
Publication date: 2022-07-19
Anticipated expiration: 2036-11-18
Also published as: ES2778101T3; CN106988399A; EP3170940B1; EP3170940A1; PT3170940T; DK3170940T3; PL3170940T3

Abstract

The present invention relates to a flush toilet with an automatic descaling procedure comprising a cyclic step.

Description

Flushing toilet with water heater

Technical Field

The present invention relates to a toilet bowl (flush toilet) having a flushing function.

Background

Such devices have been known for decades and have gained increasing attention in recent years also in europe. The development of this technology has also been directed to hot water production (warmwasherbereituring) in accordance with a number of other perspectives. For this purpose, water boilers (i.e. hot water reservoirs with heaters) and instantaneous water heaters are known in principle, which have particular advantages and disadvantages, respectively.

In the case of flush toilets with instantaneous water heaters, particle filters have been provided in the water piping system to prevent functional damage in the flush head or flush arm due to flushed particles (in particular calcified residues). Reference is made, as an example, to european patent application EP 11004229 and to the prior art cited in the prosecution procedure of this application.

WO2015143571a1 discloses a descaling capsule for a flushing toilet, wherein the descaling process is carried out by removing the nozzle at the front end of the flushing arm of the flushing toilet and replacing the descaling capsule with a descaling agent.

The present inventors have confirmed that: for example, if the use of particulate filters is to be avoided in order to avoid the expenditure of backwashing or replacement, or in order to increase the operational safety beyond the scale achieved with such particulate filters, there is a need for further improvements with regard to the particle problem.

Disclosure of Invention

The object of the present invention is therefore to provide an improved flushing toilet with good functional safety.

This task is solved by flushing the toilet bowl as follows: the flushing toilet has a water heater for heating flushing water, the water heater having a water supply connection and a flushing arm pipe connection, and a circulation pipe provided on the water heater for circulating water through the water heater, characterized in that: the circulation conduit is a return conduit between the water supply interface of the water heater and the flush arm conduit interface, and the flush toilet has a control device configured to perform automatic descaling, wherein a descaling solvent circulates through the water heater and the return conduit.

Preferred configurations are the subject of the dependent claims and are explained in detail below as an addition to the most general structural embodiments of the invention.

The invention is based on a flushing toilet with a water heater, wherein the water heater can be particularly related to a Boiler (Boiler) or a instantaneous water heater (durchlaugerfitzer); that is, the present invention is not directed to only flush toilets with instantaneous water heaters. In the case of such a flushing toilet, a control device is provided which can perform automatic descaling. Such descaling should have unique functions and high efficiency by: for this purpose, a return line is provided between the water supply connection and the flushing arm line connection of the water heater. Thus, during the descaling procedure a circulating flow may be performed, which contains and flows through the water heater.

That is, in this way, a multiple action (or a permanent action) of a limited amount of descaling solvent on the water heater is ensured. This is interesting because it is experienced that the problem of scale is only present in the parts of the hot water pipe of the toilet that are heated particularly strongly. The described functional modes are only associated with the respective return line. In the case of a conventional plumbing arrangement for flushing the toilet bowl, although in some cases precautions may be taken against this, such as injecting a descaling solvent in the boiler; however, when a flushing flow is desired, this descaling solvent may thus only be conducted away and lost through the flush arm pipe and the flush arm or the flush head.

However, according to the invention, a limited amount of descaling solvent can be circulated in a circulating manner through the water heater over a defined period of time (and, as it were, a plurality of times), wherein both the action time and the flow or turbulence (Agitation) of the water can support the descaling process. The control device according to the invention can automatically carry out this cyclical process in a stored procedure and in this respect. Here, "automatically" does not mean: the control means forcibly autonomously recognizes the need for descaling (however this is preferred) or even autonomously initiates the descaling procedure. Typically, the user manually feeds the descaling solvent and then performs the descaling procedure.

Preferably, descaling is effected by means of a descaling solvent heated by a water heater. In this case, it is not mandatory to maintain the same temperature as for the flushing operation, and in particular higher temperatures can be used.

Preferably, a switchable valve is provided in the return line, so that this switchable valve can be switched off outside the circulation step (or outside the descaling program).

According to a further preferred embodiment, an instantaneous water heater and a boiler (i.e. two water heaters) are provided. These two water heater types have particular advantages: the two are combined to facilitate the working efficiency of flushing the toilet. In particular, instantaneous water heaters are fast reacting and can be directly supplemented with thermal energy during use: (

nachfluen), i.e. the water is warmed or hot water is prepared. In contrast to this, the boiler can store energy and can already be equipped with a defined hot water store before use. With regard to further details of the effective combination of the instantaneous water heater and the boiler with each other in flushing the toilet bowl, reference is first made to prior art EP2357423a1, wherein the boiler is provided as an accumulator in combination with the instantaneous water heater. Both are connected in series and the flushing time is extended at a predetermined water temperature. In particular, a relatively high water temperature is generated here, and the heated water is mixed with the cold water itself before being fed to the rinse arm in order to be adjusted to the desired temperature.

Further, please refer to european patent application EP 15184518 filed by the same applicant shortly before the present application.

In summary, in the case of such a combined arrangement of two water heaters, a return line according to the invention is preferred which is provided for the two water heaters in common, i.e. two connections of these water heaters are connected, wherein the respective other connections are connected to one another. This circulation then flows through the two water heaters and the return line.

The descaling solvent circulation according to the invention is preferably only part of the descaling procedure. Preferably, additionally provided are: the water heater or one of the water heaters leads out the descaling solvent via the respective rinse arm pipe and rinse arm for descaling the pipe area arranged outside the circulation line and the rinse arm and the rinse head. In this case, a corresponding portion of the descaling solvent is lost. In this respect, however, this step can also be carried out simultaneously with the circulation step, in that a portion of the descaling solvent is conveyed from the water heater to the circulation line and another portion of the descaling solvent is conveyed to the rinse arm. Preferably, however, the described steps are carried out after the circulation step, i.e. only when the descaling solvent is already sufficiently effective inside the circulation line and in particular in the water heater or heaters.

In the case of the preferred embodiment described in EP 15184518 already cited, not only two water heaters are provided, but also a respective flushing nozzle associated with each water heater is provided, i.e. for example one flushing nozzle is used for the boiler and the other flushing nozzle is used for the instantaneous water heater. The individual water heaters and the associated flushing nozzles are connected to one another by a separate nozzle line.

This results in the following possible scenarios: the flushing function is selectively operated by means of the two water heaters, the nozzle lines and the nozzles or by means of only one of the groups, i.e. by means of only one "flushing branch" (consisting of a boiler or instantaneous water heater and the associated nozzle line and nozzle).

In this case, for example, in the case of limited electrical power (i.e., for example, in the case of only instantaneous water heaters or only water boilers being available at the same time), nevertheless a variably good rinsing beam effect can be achieved. Since the two "flushing branches" can then be operated in parallel with the boiler already heated, and a particularly good and efficient flushing jet effect is achieved without a common nozzle being loaded for this purpose, preferably with a high water pressure or a high water flow. However, even in the case of operation of only one of the two flushing branches, the respective nozzle is then loaded with a suitable quantity of water. This applies for example to: the boiler is still not heated and an instantaneous boiler is used, or the boiler is reheated in a flushing operation (nachhezen) and the instantaneous boiler is switched off in the process, that is to say in the event of a drop in the water temperature.

In other words, the above-described possibilities relate in particular to the requirement for a rinsing function after the switching-on process within such a short time interval that the boiler still does not reach the correct water temperature. Thus, satisfactory rinsing operation is at least always possible with the aid of the invention, with only one of the two nozzles mentioned above.

In the prior art, a rinsing arm with two nozzles is frequently involved, wherein each nozzle has in each case a special automatic function, i.e. for example either for anal or private parts cleaning. In contrast, the nozzles are often offset in the above-described position along the rinse arm and/or differ with respect to the spray angle; furthermore, these nozzles are often dedicated to: for example, a different water jet quality (e.g., higher pressure) is provided for anal cleaning than for private area cleaning. However, in the present invention, the two mentioned nozzles can also be arranged adjacently.

In the case of two water heaters, which are assigned to the flushing nozzle lines and the flushing nozzles, respectively, these preferably lead water out via the respective flushing nozzle lines and the flushing nozzles for descaling these lines and nozzles, wherein these steps can be carried out simultaneously or also in a time-staggered manner.

If a boiler is provided in addition to the instantaneous water heater, it can be easily realised that: the liquid content of the boiler is significantly greater than the amount of descaling solvent necessary for the previously described steps of flushing the flush nozzle lines and the flush nozzles. In this case, these steps (or this step) can be followed by a further recycling step to further distribute the remainder of the unconsumed descaling solvent in the boiler.

Furthermore, the descaling procedure may be provided with a descaling step for rinsing the arm cleaning device. In this case, the water heater or a water heater (in particular a boiler) can remove the descaling solvent by leading it out through the rinsing arm cleaning device. It may also relate, for example, to a device for external brushing of the rinse arm or to a device for cleaning an inner region of the rinse arm. Preferably, this step is arranged after the previously described step of dispersing the descaling solvent in the boiler. Furthermore, this step is preferably arranged after descaling of the flushing nozzle.

In the case of a further preferred embodiment, the water reservoir is arranged in the water supply line of the instantaneous water heater (in the case of a combined arrangement of instantaneous water heater and boiler) and is connected to the boiler via an overflow. The water reservoir then serves as a filling reservoir for the instantaneous water heater, which, however, can also fill the boiler at the same time. For this purpose, water flows from the water reservoir into the boiler via an overflow structure. The water reservoir is typically substantially smaller in content than the boiler. In the case of descaling, the boiler and the water reservoir are preferably jointly filled with descaling solvent. In other cases, it is nevertheless possible to have the descaling solvent dispersed in one of the boiler and the water reservoir by means of a circulation step.

Preferably, the above-mentioned return conduit between the outlet of the instantaneous water heater provided for the heated water and the corresponding outlet of the boiler has a switchable valve by means of which the conduit can be opened and closed. This pipe thus increases the flexibility on the other hand and outside the descaling process. The pipeline for example proposes the following possibilities: the water heated in the instantaneous water heater can also flow through a line which originally connects the boiler to the nozzles associated with the boiler, for example in order to flush the boiler with hot water and to expel the cold water contained therein before driving the respective nozzle. Known for such a rinsing process are: the mentioned cold water is forced out through the heated water before the original nozzle function, in order to avoid that the user first comes into contact with the cold water when rinsing. During the rinsing process, the corresponding water can be applied in or on the rinsing arm, for example for cleaning purposes, or be discarded as waste.

It is particularly preferred to provide the control device with such an arrangement for flushing the nozzle lines initially loaded by the instantaneous water heater and subsequently (in the future) the nozzle lines to be loaded by the boiler after the switching-on process by means of the water heated in the instantaneous water heater.

Furthermore, the water heated by the instantaneous water heater (at a previous time) can be used for introduction into the boiler, in particular within the framework of the described flushing process, for which purpose a shunt is configured. Thus, the water in the boiler can then be heated intensively, and/or the water in the boiler can be mixed better if heated by the boiler, and/or the colder parts of these waters can be heated in particular. It should be noted for the last aspect that the outlet of the boiler forcibly leads water out in its lower region, so that the entire boiler content can be utilized, and in the case of boilers there is a general tendency for temperature stratification (temperature) to form on heating.

When the instantaneous water heater should have a water reservoir in its water conveying pipe, then this water reservoir is connected in a preferred manner to the boiler by means of an overflow structure. This water reservoir of the instantaneous water heater and the boiler can thus be filled jointly by the fact that the filling water flows first into the water reservoir of the instantaneous water heater and via the overflow structure into the boiler through the water delivery line.

It has already been mentioned that in the case of heated flushing water being required for a boiler too early, only the flushing branch of the instantaneous water heater is applied first. Preferably, when the boiler is capable of supplying hot water, the two flushing branches are only used, so that a particularly intensive flushing function can be achieved. Here, the instantaneous water heater is operated and a hot water reserve in the boiler is applied. This can of course be associated with a corresponding operation by the user. Additionally or as an optional advantage of the invention, it should be taken into account that only the flush branch of the instantaneous water heater is still applied after the hot water reserve in the boiler has been exhausted (or after the hot water reserve in the boiler has dropped to an excessive temperature). This possibility is of course not taken into account independently of the procedure already described in the event of an early request for a flushing function.

Drawings

The invention is explained in detail below with reference to specific embodiments, wherein the individual features can also be essential features of the invention in other combinations and (as already mentioned) implicitly relate to all generic categories of the invention.

FIG. 1: block circuit diagrams for explaining specific embodiments are shown, and

FIG. 2 is a schematic diagram: the distal end of the rinse arm is shown in cross-section for purposes of explaining a particular embodiment.

Detailed Description

In fig. 1, the fresh water interface, indicated with 1, according to a particular embodiment, for flushing a toilet bowl is shown at the upper left. From the fresh water feed line 2, the fresh water flows through the particle filter 3 and the regulating valve 4 and the switching valve 5 to the vertical separation section 6, which is specified for hygiene reasons. From this vertical separation section 6, a line 7 leads to a water tank, indicated as a whole with 8. This water tank is divided into two parts: i.e. on the left is a fresh water tank 9 for the instantaneous water heater 10 and on the right is a boiler 11 with an electric heater 12. The fresh water tank 9 and the boiler 11 are connected to one another via an overflow 13, so that both (fresh water tank 9 and boiler 11) can be filled jointly via the fresh water connection 1 and the line 7. The boiler 11 has a heater 12 and a temperature sensor 19.

The pipe 14 connects the outlet of the fresh water tank 9 via a pump 31 with an instantaneous water heater 10, which instantaneous water heater 10 is provided in a usual manner with sensors for the water volume flow and the water temperature upstream and downstream of the instantaneous water heater. Downstream of the instantaneous water heater 10, a pipe 15 leads the water heated in operation further through a particle filter 16 to a multi-way valve 17.

On the other hand, the boiler 11 has a drain port disposed at a lower portion thereof, and the drain port is provided in the T-shaped member. The connection of the T-piece 18 leads via a pump 32 to the right to a flushing arm, not shown here, that is to the so-called Boost nozzle 20 of the flushing arm.

The connection of the valve 17 likewise leads to the flushing arm, i.e. to the anal nozzle 21 of the flushing arm which is arranged directly next to the booster nozzle 20. Finally, the valve 17 is connected to the other port of the tee 18 via a return line 22.

Fig. 2 shows a cross-sectional view through the distal end of the flush arm 24 in the bowl rim 23 of a flush toilet according to the present invention. This flush toilet has in a general manner a toilet bowl, wherein only a partial view of the bowl rim 23 is visible. In the basin rim 23 there is a channel-shaped opening, visible in fig. 2, in which and behind which the flushing device is mounted. This flushing device comprises a flushing arm 24, which flushing arm 24 projects from the upper left to the lower right in fig. 2 and has the two already mentioned

nozzles

20 and 21 on its right end (distal end).

Even though the precise configuration of these nozzles is not very important for the present invention, it should be mentioned that two spherical swirl chambers 25 are provided in the central region of the cross-sectional view of the rinse arm, for which swirl chambers 25 reference is made to prior art EP 2628546. These swirl chambers 25 emit swirling water jets at the upper end shown in fig. 2, which flow out through the diametrically

enlarged nozzle openings

20 and 21 and in this case receive air from the environment inside the rinse arm. The two

nozzles

20 and 21 are in relatively close proximity and have a spacing (on the upper surface of the rinse arm) of about twice the diameter of the nozzle openings. The nozzle 20 is called Boost-nozzle (Boost-D ase) and the nozzle 21 is called anal nozzle (anal nozzle); both of which are identical with respect to their geometry and are fed through a duct of the same cross section. These ducts are not shown here, but are located in front of and behind the plane of the sectional view.

Below these two swirl chambers 25, a movable nozzle arm 26 is visible, which nozzle arm 26 carries a nozzle opening, not shown, at its right (distal) end, and which nozzle arm 26 can be removed for vaginal irrigation as required. For this purpose, water is supplied via a channel 27, which water displaces the arm 26 against the force of an undesignated helical spring and loads the arm 26. This part of the flushing device is not essential to the invention.

Above the channel 27, a channel 28 is arranged, which channel 28 communicates with the ventilation structure of the

nozzles

20 and 21 according to fig. 2. This channel 28 can furthermore guide the washing water, which flows out via the

nozzles

20 and 21, when the rinse arm 24 is fully moved back (not shown).

Furthermore, a cleaning device 29 can be seen in fig. 2, which cleaning device 29 forms the distal end of the guide structure of the rinse arm 24 and is held in the basin rim 23. This cleaning device 29 can be supplied with wash water through a passage 30 and applied to clean its outer surface when the rinse arm 24 is moved out and back. Reference is made to prior art EP 2626478 for this.

Based on the two cited documents, further details are given in addition by the construction of a typical flushing toilet.

In contrast to many irrigation devices of the prior art, the two

nozzles

20 and 21 arranged on the upper side of the irrigation arm are not used for various anatomical purposes, but rather the two nozzles 20 and 21 (having the same structure and the same beam direction and being directly adjacent) are used for anal cleaning (anal reiniging). In the prior art, the second nozzle opening is typically provided for vaginal cleaning (vaginale reiniging), which can be performed by the nozzle arm 26 in the case of the present invention.

In other words, the two

nozzles

20 and 21 have the advantage that they can be simultaneously acted upon by the hot water supply system of fig. 1, that is to say the booster nozzle 20 is acted upon by the T at the outlet of the boiler 11 and the anal nozzle 21 is acted upon by the valve 17 and the instantaneous water heater 10. However, the two

nozzles

20 and 21 can also be operated individually without changing their respective jet characteristics.

A typical run-time procedure is as follows: the flushing of the toilet bowl can identify the user (e.g. by means of an infrared sensor), which triggers the control device to switch on the boiler 11, i.e. in particular its heater 12. This may also already occur when the user is only in the vicinity of the flushing toilet. However, instead of switching on the boiler 11 when the start of the toilet use is detected (for example by a touch sensor), the control device can also switch on the pumps in the instantaneous water heater 10 and the line 14 and adjust the valve 17 in such a way that the heated water is flushed through the nozzle line to the flushing nozzle 21 and the cold water is drained away. This can also be achieved before the rinse arm 24 is removed, so that the water flowing out of the nozzle 21 performs a certain cleaning function with respect to the rinse arm.

The nozzle line between the booster nozzle 20 and the boiler 11 can then be flushed with hot water (for example after the flushing function has been triggered) via the return line 22 (in the case of the corresponding state of the valve 17), to be precise again with full utilization of the instantaneous water heater 10. At the same time, a volume flow of 1/3, for example water, can be introduced into the boiler 11 through the T-piece 18 in order to provide improved mixing there and in particular heating of the cold zone in the vicinity of the drain opening.

The rinse arm can thus be cleaned in a manner known per se on removal, for example again with water heated by the instantaneous water heater 10 and in a state in which the valve 17 is not explained in detail here, on the basis of which the water passes via the interface 30 into the cleaning device 29. If the flush arm 24 has been removed, the two

nozzles

20 and 21 described above can be applied, wherein the valve 17 locks the return line 22 and each nozzle is supplied by the boiler 11 or by the instantaneous water heater 10 through its own nozzle line.

In contrast, if the requirement for the flushing function is carried out so early that the above-described operation of the boiler 11 with water of a sufficient temperature is not meaningful, it is therefore possible to operate only the anal nozzle 21 with water heated by the instantaneous water heater 10 as an emergency procedure to a certain extent, and the power-assisted nozzle 20 is operated only after a sufficient water temperature is available in the boiler 11.

Of course, other modes of operation (and not relevant to this particular embodiment) are possible, such as: normal flush function is only performed with the use of boiler water and power assisted nozzle 20 (as long as the boiler water is hot enough); it is only desired that the anal nozzle 21 is switched on (which then means that the instantaneous water heater 10 is switched on). In this case, the name of the nozzle can also be changed, since the anal nozzle 21 now functions to some extent as a booster nozzle.

In summary, the present embodiment shows: the separate line guidance between the two nozzles and the associated water heater 10 or 11 enables various advantages to be achieved, which can be used in a flexible manner. If the return line 22 is already present, this also relates to the already described flushing process up to the booster nozzle 20, with the energy content in the boiler 11 being maintained.

The functions described so far are handled by an electronic control device, which is not illustrated but is integrated in the flushing toilet. This control device has a descaling program according to the invention in order to carry out automatic descaling. This will be explained in detail below.

First, the water tank 8 is filled with a suitable descaling solvent, that is to say, which is then present both in the fresh water tank 9 and also in the boiler 11. In a first descaling step, the technical components, i.e. in particular the instantaneous water heater 10, the particle filter 16, the multi-way valve 17, the T-piece 18 and, of course, the fresh water tank 9 and the boiler 11 containing the heater 12 and the temperature sensor 19, are then descaled. For this purpose, a pump 31, which is indicated in the line 14 in fig. 1 and is provided in the original case for the anal nozzle 21, is operated, and the multi-way valve 17 is switched on in such a way that the descaling solvent fed through the

lines

14 and 15 is continuously fed through the line 22 and a pump 32 (in fig. 1 on the right side of the T-piece 18) associated with the booster nozzle 20 is blocked. In this case, a circulation flow through the boiler 11, the instantaneous water heater 10 and the return line 22 is thereby generated. Illustratively, the pump 31 may run for one minute and then pause for eight minutes for this purpose, and this process can be repeated, for example, three times.

In a second program step, the anal nozzle 21 and the nozzle line leading to the anal nozzle 21 are descaled. For this purpose, the multi-way valve 17 is switched in such a way that the descaling solvent is emitted through the anal nozzle 21 and does not reach the return line 22. Accordingly, this procedural step also facilitates descaling of the

pipes

14 and 15, the particulate filter 16, the instantaneous water heater 10, and of course the pump 31. In addition, the corresponding parts of the multi-way valve 17, the piping downstream thereof leading to the anal nozzle 21, and the anal nozzle 21 are descaled. It is thus possible, for example, for the quantity of descaling solvent present in the fresh water tank 9 to be used up, whereas the quantity of descaling solvent in the boiler 11 is not used.

Then, in a third step, the booster nozzle 20 and the flushing line leading to the booster nozzle 20 together with the pump 32 can be descaled. For this purpose, this pump 32 is operated, the descaling solvent passing through the boiler 11 and being ejected via the booster nozzle 20, the entire process lasting, for example, 5 seconds.

Then, in a fourth step, the fresh water tank 9, which was previously almost evacuated, is filled again with fresh water.

In a fifth step, a further circulation step, for example lasting 12 seconds, can then be carried out completely analogously to the circulation step described at the outset, by means of which the descaling solvent still present in the boiler 11 is dispersed in the system, using the pump 31.

In a sixth further step, the rinse arm cleaning device 29 described with reference to fig. 2 is descaled. For this purpose, the multi-way valve 17 is adjusted accordingly, and the descaling solvent is conveyed from the fresh water tank 9 via the pump 31 and the

lines

14 and 15, then by means of conveying lines not shown in fig. 1 and finally via the channel 30 (fig. 2) to the cleaning device 29. For example, the content of the fresh water tank 9 can here be substantially exhausted again.

In a seventh, subsequent step, the booster nozzle 20 can then be descaled again, as already described. Since in this case there is also a descaling solvent in the boiler 11, the steps need to be repeated.

In a following eighth step, the fresh water tank 9 and the boiler 11 are then refilled with water.

This is followed by a ninth (as already described) further recycling step for the dispersion of the descaling solvent which is always still present in the boiler 11.

Thus, the descaling solvent is again distributed in the system, but is clearly diluted. In order to flush the system, in a tenth step, the fresh water tank 9 can now first be emptied via the anal nozzle 21 and thus via the

lines

14 and 15 and the multi-way valve 17.

Then, in an additional eleventh rinsing step, the contents of the boiler 11 may be emptied via the booster nozzle 20 (i.e. via the tee 18 and the pump 32). Then, in a twelfth step, the two water tanks (i.e., the fresh water tank 9 and the boiler 11) are refilled with water.

Thereafter, in a further (thirteenth) rinsing step, the fresh water tank 9 is emptied again, but this time via the rinsing-arm cleaning device 29 (i.e. again via the

conduits

14 and 15 and the multi-way valve 17). In a fourteenth step, the boiler 11 is then emptied again, as already described. The two tanks, namely the fresh water tank 9 and the boiler 11, are filled with fresh water in a fifteenth step. These rinsing steps can of course be repeated, depending on the need and the aggressiveness of the original descaling solvent.

In summary, the descaling procedure is characterized by various recycling steps which firstly improve the utilization of the descaling solvent itself, but also improve the thoroughness of the descaling itself (Gr ndlichkeit), and which can then be used in a further course for dispersing the residual part of the descaling solvent in the system. In particular, in the circulation step, a thorough flushing of not only the boiler 11 but also the instantaneous water heater 10 can be achieved. Nevertheless, the

nozzles

20 and 21, the flushing lines associated with these

nozzles

20 and 21, and the flushing arm cleaning device 29 can also be descaled and flushed in a special descaling step, which does not require a circulation.

Claims

1. A flushing toilet having a water heater (10, 11) for heating flushing water, the water heater having a water supply connection and a flushing arm pipe connection, and a circulation pipe (22) provided on the water heater (10, 11) for circulating water through the water heater (10, 11), characterized in that:

The circulation conduit (22) is a return conduit between the water supply interface of the water heater (10, 11) and the rinse arm conduit interface; and is

The flushing toilet has an electronic control device integrated in the flushing toilet, in which a predefined automatic descaling program is provided for carrying out an automatic descaling in which a descaling solvent circulates through the water heater (10, 11) and the return line.

2. The flushing toilet according to claim 1, having two water heaters (10, 11), which are an instantaneous water heater and a boiler, which are connected to each other by a pipe, wherein the return pipe is connected to a respective further connection of each of the two water heaters (10, 11), so that a descaling solvent can be circulated jointly through the two water heaters (10, 11) during automatic descaling.

3. The flushing toilet bowl according to claim 2, wherein during automatic descaling an additional step is provided in which the water heater (10, 11) or at least one of the two water heaters (10, 11) delivers descaling solvent via the flushing nozzle (20, 21) and in this case the lines leading to the flushing nozzle (20, 21) are descaled.

4. The toilet bowl according to claim 2 or 3, wherein at least two flushing nozzles (20, 21) are provided for emitting heated flushing water, wherein each flushing nozzle of the flushing nozzles (20, 21) is assigned to a respective water heater of the water heaters (10, 11) and is connected to this water heater (10, 11) via a respective nozzle line.

5. The flush toilet of claim 4, wherein the following steps are provided during automatic descaling: in this step, a further water heater (10, 11) outputs descaling solvent via a further flushing nozzle (20, 21) and thereby descales the lines leading to this flushing nozzle (20, 21).

6. The toilet according to claim 5, wherein one of the two water heaters (10, 11) is an instantaneous water heater and the other is a boiler, and

after the descale solvent passing through the instantaneous water heater and through the boiler is output through the two rinse nozzles (20, 21), a circulation step is performed for dispersing the descale solvent still contained in the boiler.

7. The toilet according to claim 6, wherein means (29) for cleaning the flush arm are provided, which can be supplied with hot water by said water heater, wherein the automatic descaling comprises the following steps: in this step, the water heater outputs a descaling solvent via the rinse arm cleaning device (29) for descaling the same.

8. The flush toilet of claim 7, wherein the descaling solvent contained in the boiler is applied to descale the flush arm cleaner (29) after the descaling solvent passing through the instantaneous water heater and through the boiler is output through the two flush nozzles (20, 21).

9. A toilet according to claim 2, said toilet having a reservoir (9) in the water supply line (7, 14) of said instantaneous water heater, the reservoir (9) being connected to said boiler in the water supply line (7, 14) of said instantaneous water heater by an overflow arrangement (13) so that both can be filled jointly upstream of the reservoir (9) through said water supply line (7, 14).

10. The flushing toilet according to claim 4, wherein the control device is designed to flush the nozzle line to which the instantaneous water heater is applied and the flushing nozzle to which the instantaneous water heater is applied with water heated by the instantaneous water heater during the switching-on process, and to flush the nozzle line to which the boiler is applied and the flushing nozzle to which the boiler is applied with heated water after a certain time.

11. The flush toilet of claim 10, wherein the control device is designed to flush the nozzle line loaded by the boiler during switch-on with water heated by the instantaneous water heater via a return line between the outlet of the instantaneous water heater and the outlet of the boiler.

12. The flush toilet of claim 11, wherein said control device is configured to divert a portion of the water heated by said instantaneous water heater from said return conduit to said boiler.

13. The flushing toilet according to claim 12, wherein the control device is designed such that, after a switch-on process and in the event that the user operates the flushing function of the flushing toilet so early that the water in the boiler has not yet been heated or has not yet been completely heated, only the instantaneous water heater, the nozzle line loaded by the instantaneous water heater and the flushing nozzle loaded by the instantaneous water heater are used for the flushing function, and

in case of a later operation of the flushing function, the instantaneous water heater and the boiler as well as the nozzle lines and the flushing nozzles (21, 20) loaded by the instantaneous water heater and the boiler, respectively, are simultaneously used for the flushing function.

14. Use of a flushing toilet for descaling according to an automatic descaling program predefined by a control device, the flushing toilet being according to one of the preceding claims 1 to 13.