Drainage device of a sanitary device

Abstract

The invention relates to a drainage device (1) of a sanitary device (1), at least comprising: - a basin (3) with a first chamber (4) and a second chamber (5) which are connected to each other via at least one closable opening (6); wherein the second chamber (5) has a closable outflow (7) for a liquid (8); - a first fresh-water line (9) for feeding fresh water (10) into the first chamber (4); and a return line (11) for returning liquid (8) from the first chamber (4) towards the sanitary device (1).

Description

[0001] Drainage device of a sanitary facility

[0002] The present invention relates to a drain device of a sanitary facility, wherein the sanitary facility can be used in particular by persons in sanitary rooms, such as bathrooms, for showering, bathing and / or for personal hygiene.

[0003] The use of sanitary facilities such as showers or bathtubs can result in high water consumption. For this reason, sanitary facilities are known in which at least a portion of the used water can be recycled back into the sanitary facilities for reuse. In such a recycling system, it is almost impossible to avoid contact with foam.

[0004] Known solutions for dealing with foam are currently unsatisfactory and involve disadvantages for the user:

[0005] - for example, the foam-added water is automatically drained away via a drain, so that only a poor level of efficiency can be achieved:

[0006] - the foam is separated using filter media, which entails higher costs and higher maintenance requirements;

[0007] - no separation of the foam takes place, which leads to immense foam formation and thus contamination of the system; a breeding ground for germs and bacteria is created.

[0008] The object of the invention is therefore to at least partially solve the problems described with reference to the prior art and, in particular, to provide a drain device for a sanitary facility that is suitable for removing foam and for cleaning the system (i.e., for cleaning at least parts of the sanitary facility). These objects are achieved by a drain device according to the features of the independent patent claim. Further advantageous embodiments of the invention are specified in the dependent patent claims. It should be noted that the features individually listed in the dependent patent claims can be combined with one another in any technologically expedient manner and define further embodiments of the invention. Furthermore, the features specified in the patent claims are specified and explained in more detail in the description, with further preferred embodiments of the invention being presented.

[0009] A drainage device for a sanitary facility is proposed, comprising at least: a basin with a first chamber and a second chamber, which are connected to one another via at least one closable opening; wherein the second chamber has a closable drain for a liquid; a first fresh water line for supplying fresh water to the first chamber; and a return line for returning liquid from the first chamber to the sanitary facility.

[0010] In particular, in a first state of the drainage device, the drain is open and the opening is closed, thus fluidically separating the first chamber from the second chamber.

[0011] In particular, in a second state of the drainage device, the drain is closed and the opening is open, thus fluidically connecting the first chamber to the second chamber. In particular, in a third state of the drainage device, the drain is open and the opening is open, thus fluidically connecting the first chamber to the second chamber.

[0012] In particular, the second chamber is delimited by a wall, wherein the wall has a recess for fluid connection to a collecting device (a basin) of the sanitary facility, so that a liquid discharged by a discharge device of the sanitary facility flows from the collecting device via the recess into the second chamber.

[0013] A sanitary facility is further proposed, at least comprising: at least one dispensing device for a liquid; the described drainage device, at least comprising o a basin with a first chamber and a second chamber, which are connected to one another via at least one closable opening; wherein the second chamber has a closable drain for a liquid; and o a first fresh water line for supplying fresh water to the first chamber; and o a return line for returning liquid from the first chamber as a circulating liquid to the sanitary facility; a circulating device.

[0014] The return line forms the circulation device, through which at least a portion of the liquid in the basin can be supplied to the dispensing device as the circulating liquid. The circulation device comprises, in particular, a pump arranged in the return line. The pump can suck liquid from the basin or the first chamber and convey it to the dispensing device.

[0015] In particular, the sanitary facility additionally has at least one second fresh water line for supplying fresh water to the dispensing device.

[0016] In particular, the sanitary facility has a control device by means of which the different states of the drainage device can be adjusted.

[0017] A method for operating the described sanitary facility is further proposed. In a first operating mode of the sanitary facility, the drain device is in a first state, with the drain open and the opening closed, thus fluidically separating the first chamber from the second chamber. In the first operating mode, the fresh water is directed into the first chamber via the first fresh water line.

[0018] In particular, in the first operating mode, the liquid present in the first chamber is returned from the first chamber to the discharge device via the return line. Liquid discharged via the discharge device is only directed to the second chamber and from there to the drain.

[0019] In a second operating mode of the sanitary facility, the drain device is in a second state, with the drain closed and the opening open, thus fluidically connecting the first chamber to the second chamber. In the second operating mode, a liquid dispensed via the dispensing device is directed into the second chamber and at least also into the first chamber, with at least a portion of the liquid in the basin being fed as circulating liquid via the return line of the dispensing device.

[0020] In the second operating mode, depending on the fill level in the pool, the drain is opened at least temporarily, and the liquid from the pool is directed into the drain. The fill level can be monitored, in particular, by a fill level sensor. If the fill level is low (lack of liquid), water can be added via the first fresh water line. If there is too much water in the pool, the drain does not need to be raised, as it can have an overflow function. Excess water can then be drained from the pool at any time via the overflow of the drain plug (the drain).

[0021] In particular, the sanitary facility additionally comprises at least one second fresh water line for supplying fresh water to the dispensing device. In a third operating mode of the sanitary facility, the drain device is in a first state, with the drain open and the opening closed, thus fluidically separating the first chamber from the second chamber. In the third operating mode, fresh water is supplied to the dispensing device exclusively via the second fresh water line, with the liquid dispensed via the dispensing device being directed only into the second chamber and from there into the drain.

[0022] In a fourth operating mode of the sanitary facility, the drain device is initially in a first state, with the drain open and the opening closed, thus fluidically separating the first chamber from the second chamber. In the fourth operating mode, the fresh water is initially directed into the first chamber via the first fresh water line (until, for example, a certain fill level is reached in the first chamber), and then the drain device switches to a third state, with the drain open and the opening open, thus fluidically connecting the first chamber to the second chamber.

[0023] In the fourth operating mode, the first chamber in particular is at least partially filled with fresh water, e.g., up to a maximum fill level. The drain device is then transferred to the third state, in which the drain and the opening are open, thus fluidly connecting the first chamber to the second chamber. This opening allows the fresh water retained in the first chamber to flow out, and any foam present in the second chamber can be discharged via the drain.

[0024] In the fourth operating mode, the fresh water present in the first chamber can also be led to the dispensing device, in particular via the return line.

[0025] The combination of the first fresh water line and the drainage system divided into two chambers makes it possible to flush the system with fresh water as quickly as possible without drawing in recycled water (circulating fluid), which may be contaminated with foam and impurities, via the return line. The incoming fresh water is introduced in such a way that a short-term cleaning of the drainage system, or at least the first chamber, is achieved.

[0026] In addition, the drainage system is designed in such a way that recycling water flowing into the pool cannot flow towards the pump's intake port (i.e. the return line) during the cleaning cycle.

[0027] This allows for the fastest possible cleaning of sanitary components that come into contact with recycled water through a freshwater flush. Furthermore, system cleaning can also be used during a shower, for example, to flush water containing surfactants from the system. In particular, there are no wearing parts. Maintenance is also not required.

[0028] In particular, the sanitary facility has a control device by means of which the different operating modes of the sanitary facility and the states of the drainage device can be adjusted.

[0029] In particular, at least one data processing system is provided which has means which are suitably equipped, configured or programmed to carry out the method or which carry out the method.

[0030] In particular, the sanitary facility comprises a data processing system, e.g. the control device, which has means for executing the method and / or which has means that are suitably equipped, configured or programmed to execute the method or that execute the method.

[0031] The means include, for example, a processor and a memory in which instructions to be executed by the processor are stored, as well as data lines or transmission devices that enable the transmission of instructions, measured values, data or the like between the elements mentioned.

[0032] The "means" may in particular comprise one or more of the following components: controller(s), microcontroller, data memory, data connection, display devices (such as a display), counter or timer, at least one further sensor, an energy source, etc. Furthermore, a computer program is proposed, comprising instructions which, when the program is executed by a computer, cause the computer to carry out the described method.

[0033] Furthermore, a computer-readable storage medium is proposed, comprising instructions which, when executed by a computer, cause the computer to carry out the described method or the steps of the described method.

[0034] The statements regarding the method are particularly applicable to the sanitary facility, the drainage device, the data processing system and / or the computer-implemented method (i.e. the computer program and the computer-readable storage medium) and vice versa.

[0035] The sanitary facility is, in particular, a facility for a person’s personal hygiene. For this purpose, the sanitary facility can, for example, be designed in the manner of a shower or bathtub and / or be arranged in a sanitary room, such as a bathroom. In addition, the sanitary facility can be used for therapeutic applications. The sanitary facility has at least one dispensing device for a liquid. The at least one dispensing device can, in particular, be a shower, overhead shower, hand shower, nozzle and / or outlet opening. A liquid, in particular water, can be dispensed through at least one dispensing opening of the dispensing device into (at least) one basin of the sanitary facility (the collecting device) or into the basin or the second chamber of the drainage device.

[0036] The basin or collection device can be designed, in particular, in the manner of a shower tray or a bathtub. Furthermore, the basin can be arranged or attached in a stationary manner, for example, to a building floor. In particular, only the basin of the drainage device in the second chamber has (at least) one outlet for the liquid on a basin floor. The liquid can be fed, in particular, to a public sewer system via the outlet. It is possible for a single basin or a single outlet to be assigned to multiple discharge devices, but this is not mandatory.

[0037] The sanitary facility further comprises, in particular, a thermostat (in the simplest embodiment, a mixing device without its own temperature control), by means of which hot water and cold water can be mixed to form a temperate mixed water. The hot water and cold water are each fresh water and can be mixed by the thermostat to form mixed water with a desired mixed water temperature. A hot water temperature of the hot water can, in particular, be a maximum of 90 °C (degrees Celsius), preferably 25 °C to 90 °C, particularly preferably 55 °C to 65 °C, and / or a cold water temperature of the cold water can, in particular, be a maximum of 25 °C (degrees Celsius), preferably 1 °C to 25 °C, particularly preferably 5 °C to 20 °C. The desired temperature of the liquid dispensed via the dispensing device can, for example, be 30 °C to 50 °C, preferably 35 °C to 45 °C, particularly preferably 35 °C to 40 °C.

[0038] The hot water can be supplied to the thermostat, for example, from a hot water source, such as a boiler, a (private and / or local) thermal solar system or a heat pump, via a hot water pipe and / or the cold water from a cold water source, such as a building water connection, a public water supply network or a (private / local) well, via a cold water pipe. The hot water pipe and / or cold water pipe can be designed at least partially in the manner of a pipeline. Furthermore, the hot water pipe and / or cold water pipe can run at least partially through a building wall and / or a building floor. The thermostat can have a hot water inlet for the hot water and / or a cold water inlet for the cold water. The hot water pipe can be connected to the hot water inlet and / or the cold water pipe can be connected to the cold water inlet.In addition, the thermostat can be located at least partially in the building wall or the building floor.

[0039] The combined water pipe may be designed at least partially in the form of a pipe and / or hose line.

[0040] In particular, the sanitary facility has a circulation system. The circulation system comprises at least one return line, which can be designed at least partially in the manner of a pipeline. Furthermore, the return line can extend at least partially through a building wall and / or a building floor. Liquid in the basin or in the first chamber is returned to the dispensing device as circulating liquid via the circulation system.

[0041] The return line can be used to supply the fluid, particularly to the thermostat, or directly to the mixed water line. The return line is not supplied to the thermostat, but directly to the dispensing device. In a recycling shower, it is particularly important to separate fresh water and recirculating water. For example, the dispensing device has a two-way showerhead, so that one connection of the dispensing device can be used for fresh water and the other for recirculating water.

[0042] The sanitary facility can have an (electronic) control device with which a mixing ratio between the circulating fluid and the mixed water (or the hot water and / or the cold water) can be controlled such that the fluid dispensed via the dispensing device has a desired temperature. The sanitary facility can, in particular, be operated in various modes. For example, only fresh water can be used. Furthermore, only circulating fluid can be used. Furthermore, mixed operation can be provided, in which fresh water and circulating fluid are used simultaneously, at least temporarily.

[0043] The desired temperature of the liquid dispensed via the dispensing device can be adjusted by a user of the sanitary facility, for example, via an actuating element of the sanitary facility and / or the thermostat. Furthermore, the dispensed quantity of the liquid dispensed via the dispensing device can be adjusted by the user of the sanitary facility via the actuating element or another actuating element.

[0044] The use of indefinite articles ("a", "an", "an" and "another"), particularly in the patent claims and the description reproducing them, is to be understood as such and not as a numeral. Terms or components introduced accordingly are therefore to be understood as being present at least once and, in particular, can also be present multiple times.

[0045] As a precaution, it should be noted that the numerals used here ("first", "second", ...) primarily serve (only) to distinguish between several similar objects, quantities or processes, and therefore in particular do not necessarily prescribe any dependency and / or sequence of these objects, quantities or processes. Should a dependency and / or sequence be necessary, this is explicitly stated here or it will be obvious to the person skilled in the art upon studying the specifically described embodiment. To the extent that a component can occur multiple times ("at least one"), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory. The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be noted that the invention is not intended to be limited by the exemplary embodiments cited.It should be noted that the figures, and in particular the proportions depicted, are only schematic. They show:

[0046] Fig. 1: a sanitary facility;

[0047] Fig. 2: a drain device in a first state in a third operating mode of the sanitary device;

[0048] Fig. 3: the discharge device according to Fig. 2 in a second state at a second

[0049] Operating mode of the sanitary facility;

[0050] Fig. 4: the drain device according to Figs. 2 and 3 in a first state in a first operating mode of the sanitary device; and

[0051] Fig. 5: the drain device according to Fig. 2 to 4 in a third state in a fourth operating mode of the sanitary device.

[0052] Fig. 1 shows a sanitary facility 2. The sanitary facility 2 has a dispensing device 15 for a liquid 8, a drainage device 1, and a circulation device 17. The drainage device 1, which is described in more detail in Figs. 2 to 5, comprises a basin 3, a first fresh water line 9 for supplying fresh water 10 into the first chamber 4 of the basin 3, and a return line 11 for returning liquid 8 from the first chamber 4 as a circulating liquid 16 to the sanitary facility 2. The return line 11 forms the circulation device 17, through which at least a portion of the liquid 8 in the basin 3 can be supplied to the dispensing device 15 as the circulating liquid 16.

[0053] The circulation device 17 comprises a pump 23 arranged in the return line 11. Liquid 8 can be sucked from the basin 3 or the first chamber 4 via the pump 23 and conveyed to the dispensing device 15. The sanitary facility 2 additionally has a second fresh water line 18 (here, two fresh water lines 18 for hot water 20 and cold water 21) for supplying fresh water 10 to the dispensing device 15.

[0054] The sanitary facility 2 is designed like a shower. The dispensing device 15 is a showerhead. A liquid 8 can be dispensed through a dispensing opening of the dispensing device 15 into a basin of the sanitary facility 2 (the collecting device 14) or into the basin 3 or the second chamber 5 of the drain device 1.

[0055] Only the basin 3 of the drainage device 1 has the outlet 7 for the liquid 8 in the second chamber 5 at a basin bottom. The liquid 8 can be fed to a public sewer system 26 via the outlet 7.

[0056] The sanitary facility 2 comprises a thermostat 19, by means of which hot water 20 and cold water 21 can be mixed to form a tempered mixed water 22. The hot water 20 and the cold water 21 are each fresh water 10 and can be mixed by the thermostat 19 to form mixed water 22 with a desired mixed water temperature. The liquid 8 can be supplied to the thermostat 19 via the return line 11. The sanitary facility 2 has an (electronic) control device 25, with which a mixing ratio between the circulating liquid 16 and the mixed water 22 (or the hot water 20 and / or the cold water 21) can be controlled such that the liquid 8 dispensed via the dispensing device 15 has a desired temperature.

[0057] Sanitary facility 2 can be operated in various modes. For example, only fresh water 10 can be used. Furthermore, only circulating fluid 16 can be used. Furthermore, mixed operation can be provided, in which fresh water 10 and circulating fluid 16 are used simultaneously, at least temporarily.

[0058] The individual operating modes can be selected and adjusted via the control devices 25, so that the sanitary facility 2 can be operated in the selected operating mode. Furthermore, the individual states of the drain device 1 can be set or established via the control device 25.

[0059] Fig. 2 shows a drain device 1 in a first state during a third operating mode of the sanitary device 2. A perspective view of the drain device 1 is shown on the left in Fig. 2, and a top view is shown on the right in Fig. 2. Reference is made to the explanations for Fig. 1.

[0060] The drainage device 1 comprises a basin 3 with a first chamber 4 and a second chamber 5, which are connected to one another via two closable openings 6, wherein the second chamber 5 has a closable drain 7 for a liquid 8. The drainage device 1 further comprises a first fresh water line 9 for supplying fresh water 10 into the first chamber 4 and a return line 11 for returning liquid 8 from the first chamber 4 to the sanitary facility 2 or to the dispensing device 15.

[0061] The second chamber 5 is delimited by a wall 12, wherein the wall 12 has a recess 13 for fluid connection to the collecting device 14 (a basin 3) of the sanitary device 2, so that a liquid 8 discharged by a discharge device 15 of the sanitary device 2 flows from the collecting device 14 via the recess 13 into the second chamber 5.

[0062] In the first state of the drainage device 1, the drain 7 is open and the openings 6 are closed, thus fluidically separating the first chamber 4 from the second chamber 5.

[0063] In the third operating mode of the sanitary facility 2, the drainage device 1 is in a first state, with the drain 7 open and the openings 6 closed, thus fluidically separating the first chamber 4 from the second chamber 5. In the third operating mode, fresh water 10 is supplied to the dispensing device 15 exclusively via the second fresh water line 18, with the liquid 8 dispensed via the dispensing device 15 being directed only into the second chamber 5 and from there into the drain 7.

[0064] Fig. 3 shows the drainage device 1 according to Fig. 2 in a second state in a second operating mode of the sanitary device 2. On the left in Fig. 2 there is a perspective view of the drainage device 1, on the right in Fig. 2 a plan view. Reference is made to the explanations for Fig. 2. In the second operating mode of the sanitary device 2, the drainage device 1 is in a second state, wherein the drain 7 is closed and the openings 6 are open and thus the first chamber 4 is fluidly connected to the second chamber 5. In the second operating mode, a liquid 8 dispensed via the dispensing device 15 is conducted into the second chamber 5 and at least also into the first chamber 4, wherein at least part of the liquid 8 located in the basin 3 is supplied as circulating liquid 16 via the return line 11 to the dispensing device 15.

[0065] In the second operating mode, depending on a fill level of the basin 3 monitored by a fill level sensor 24, the drain 7 is opened at least temporarily and the liquid 8 is led from the basin 3 into the drain 7.

[0066] Fig. 4 shows the drain device 1 according to Figs. 2 and 3 in a first state during a first operating mode of the sanitary device 2. A perspective view of the drain device 1 is shown on the left in Fig. 2, and a top view is shown on the right in Fig. 2. Reference is made to the explanations for Figs. 2 and 3.

[0067] In the first operating mode of the sanitary facility 2, the drain device 1 is in a first state, with the drain 7 open and the openings 6 closed, thus fluidically separating the first chamber 4 from the second chamber 5. In the first operating mode, the fresh water 10 is directed into the first chamber 4 via the first fresh water line 9.

[0068] In the first operating mode, the liquid 8 present in the first chamber 4 is returned from the first chamber 4 to the discharge device 15 via the return line 11. A liquid 8 discharged via the discharge device 15 is only directed into the second chamber 5 and from there into the drain 7. Fig. 5 shows the drain device 1 according to Figs. 2 to 4 in a third state in a fourth operating mode of the sanitary device 2. Reference is made to the explanations regarding Figs. 2 to 4.

[0069] In the fourth operating mode of the sanitary facility 2, the drainage device 1 is initially in a first state, wherein the drain 7 is open and the openings 6 are closed, thus fluidically separating the first chamber 4 from the second chamber 5. In the fourth operating mode, the fresh water 10 is first conducted via the first fresh water line 9 into the first chamber 4 (until, for example, a certain fill level in the first chamber 4 is reached) and then the drainage device 1 changes to a third state, in which the drain 7 and the openings 6 are open, thus fluidically connecting the first chamber 4 to the second chamber 5.

[0070] In the fourth operating mode, the first chamber 4 is at least partially filled with fresh water 10, e.g., up to a maximum fill level, wherein the drainage device 1 is then transferred to the third state, in which the drain 7 and the openings 6 are open, thus fluidly connecting the first chamber 4 to the second chamber 5. By opening the openings 6, the fresh water 10 retained in the first chamber 4 can flow out and discharge any foam present in the second chamber 5 via the drain 7.

[0071] In the fourth operating mode, the fresh water 10 present in the first chamber 4 can also be led to the discharge device 15 via the return line 11.

[0072] The combination of the first fresh water line 9 and the drain device 1, which is divided into two chambers 4, 5, makes it possible to flush the system with fresh water 10 as quickly as possible without drawing in recycled water (circulating fluid 16), which may be contaminated with foam and impurities, via the return line 11. The incoming fresh water 10 is introduced in such a way that a short-term cleaning of the drain device 1 or at least the first chamber 4 is achieved.

[0073] In addition, the drainage device 1 is constructed in such a way that recycling water flowing into the basin 3 cannot reach the suction port of the pump 23 (i.e. the return line 11) during the cleaning cycle.

[0074] This allows for the fastest possible cleaning of the components of the sanitary facility 2 that come into contact with recycled water by flushing with fresh water 10. Furthermore, system cleaning can also be used during a shower, for example, to flush surfactant-containing water from the system.

[0075] List of reference symbols

[0076] 1 drainage device

[0077] 2 sanitary facilities

[0078] 3 pools

[0079] 4 first chamber

[0080] 5 second chamber

[0081] 6 Opening

[0082] 7 Drain

[0083] 8 Liquid

[0084] 9 first fresh water pipe

[0085] 10 Fresh water

[0086] 11 Return line

[0087] 12 wall

[0088] 13 Recess

[0089] 14 Collection facility

[0090] 15 Dispensing facility

[0091] 16 Circulating fluid

[0092] 17 Circulation device

[0093] 18 second fresh water pipe

[0094] 19 Thermostat

[0095] 20 hot water

[0096] 21 cold water

[0097] 22 Mixed water

[0098] 23 Pump

[0099] 24 Level sensor

[0100] 25 Control device

[0101] 26 Sewer system

Claims

Drainage device (1) of a sanitary facility (2), at least comprising: a basin (3) with a first chamber (4) and a second chamber (5), which are connected to one another via at least one closable opening (6); wherein the second chamber (5) has a closable drain (7) for a liquid (8); a first fresh water line (9) for supplying fresh water (10) into the first chamber (4); and a return line (11) for returning liquid (8) from the first chamber (4) to the sanitary facility (2). Drainage device (1) according to patent claim 1, wherein in a first state of the drainage device (1), the drain (7) is open and the opening (6) is closed, thus fluidically separating the first chamber (4) from the second chamber (5).Drainage device (1) according to one of the preceding claims, wherein in a second state of the drainage device (1), the outflow (7) is closed and the opening (6) is opened, thus fluidically connecting the first chamber (4) to the second chamber (5). Drainage device (1) according to one of the preceding claims, wherein in a third state of the drainage device (1), the outflow (7) is opened and the opening (6) is opened, thus fluidically connecting the first chamber (4) to the second chamber (5). Drainage device (1) according to one of the preceding claims, wherein the second chamber (5) is delimited by a wall (12), wherein the wall (12) has a recess (13) for fluid connection to a collecting device (14) of the sanitary device (1), so that a discharge device (15) of the sanitary device (1) flows from the collecting device (14) via the recess (13) into the second chamber (5). Sanitary device (2) at least comprising: at least one dispensing device (15) for a liquid (8); a drainage device (1) according to one of the preceding claims; and a circulation device (17); wherein the return line (11) of the drainage device (1) forms the circulation device (17), through which at least a portion of the liquid (8) located in the basin (3) of the drainage device (1) can be supplied as the circulating liquid (16) to the dispensing device (15). Sanitary device (2) according to claim 6, additionally comprising at least one second fresh water line (18) for supplying fresh water (10) to the dispensing device (15).Method for operating a sanitary device (2) according to one of the preceding claims 6 and 7, wherein in a first operating mode of the sanitary device (2) the drain device (1) is in a first state, wherein the drain (7) is open and the opening (6) is closed and thus the first chamber (4) is fluidically separated from the second chamber (5); wherein in the first operating mode the fresh water (10) is conducted into the first chamber (4) via the first fresh water line (9). Method according to claim 8, wherein in the first operating mode, the liquid present in the first chamber (4) is returned from the first chamber (4) to the dispensing device (15) via the return line (11); wherein a liquid (8) dispensed via the dispensing device (15) is guided only into the second chamber (5) and from there into the drain (7).Method according to one of the preceding claims 8 and 9, wherein in a second operating mode of the sanitary facility (2), the drainage device (1) is in a second state, wherein the drain (7) is closed and the opening (6) is opened, thus fluidically connecting the first chamber (4) to the second chamber (5); wherein in the second operating mode, a liquid (8) discharged via the discharge device (15) is conducted into the second chamber (5) and at least also into the first chamber (4), wherein at least a portion of the liquid (8) in the basin (3) is supplied as circulating liquid (16) via the return line (11) to the discharge device (15). Method according to claim 10, wherein in the second operating mode, depending on a fill level of the basin (3), the drain (7) is opened at least temporarily, and the liquid (8) is conducted from the basin (3) into the drain (7).Method according to one of the preceding claims 8 to 11, wherein the sanitary facility (2) additionally has at least one second fresh water line (18) for supplying fresh water (10) to the dispensing device (15); wherein in a third operating mode of the sanitary facility (2) the drain device (15) is in a first state, wherein the drain (7) is opened and the opening (6) is closed and thus the first chamber (4) is fluidically separated from the second chamber (5). is separated; wherein in the third operating mode, fresh water (10) is supplied to the dispensing device (15) exclusively via the second fresh water line (18), wherein the liquid (8) dispensed via the dispensing device (15) is only directed into the second chamber (5) and from there into the drain (7).Method according to one of the preceding claims 8 to 12, wherein in a nerved operating mode of the sanitary facility (2) the drainage device (15) is initially in a first state, wherein the drain (7) is open and the opening (6) is closed and thus the first chamber (4) is fluidically separated from the second chamber (5); wherein in the fourth operating mode the fresh water (10) is firstly conducted via the first fresh water line (9) into the first chamber (4) and then the drainage device (15) changes to a third state in which the drain is open (7) and the opening (6) is open and thus the first chamber (4) is fluidically connected to the second chamber (5).

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