CN114561782A

CN114561782A - Household appliance for treating a treatment substance, comprising a water tank

Info

Publication number: CN114561782A
Application number: CN202111409261.5A
Authority: CN
Inventors: A·阿耶奈尔; N·帕特尔; D·佩利茨
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2020-11-27
Filing date: 2021-11-25
Publication date: 2022-05-31
Also published as: DE102020214963A1; EP4006225A1

Abstract

The invention relates to a household appliance for treating a treatment substance, comprising a treatment chamber for receiving the treatment substance, a supply device for supplying water from a fresh water connection to the treatment chamber, the supply device having a front chamber, a first supply line connecting the fresh water connection to the front chamber, in which an inlet valve assembly comprising at least one first valve is arranged, and a first air section connected to the front chamber is arranged between the first valve and the front chamber, and at least one transfer line connecting the front chamber to the treatment chamber, and a water tank, which is connected to the fresh water connection via a second supply line, which has a second valve. In addition, a second air path is arranged in the second supply line between the second valve and the water tank, the second air path being connected to the front chamber, and the second supply line opening into the water tank below a predetermined water level. The household appliance is in particular designed as a laundry care machine for treating laundry as a treatment product.

Description

Household appliance for treating a treatment substance, comprising a water tank

Technical Field

The invention relates to a household appliance for treating a treatment substance, comprising a treatment chamber for receiving the treatment substance, a supply device for supplying water from a fresh water connection to the treatment chamber, and a water tank, wherein the supply device has a front chamber, a first supply line connecting the fresh water connection to the front chamber, and at least one transfer line connecting the front chamber to the treatment chamber, wherein an inlet valve assembly comprising at least one first valve is arranged in the first supply line, and a first air section connected to the front chamber is arranged between the first valve and the front chamber, wherein the water tank is connected to the fresh water connection via a second supply line having a second valve.

Background

Document EP 2850241B 1 discloses a household appliance of the type defined above. The household appliance is designed in particular as a laundry care machine for the care of laundry, in particular as a washing machine or a washer-dryer, and has a mist generator. The mist generator comprises a water tank filled with fresh water from a fresh water interface, in which tank an ultrasonic generator is arranged. By means of the ultrasonic generator, a cold mist can be generated in the water tank above the water level, which cold mist is supplied to the treatment substance present in the treatment chamber, in particular in the lye container with the rotatable drum situated therein, by means of the air flow generated by the blower via a mist channel configured as a circuit. Further, the mist passage includes a reaction gas generator for generating a reaction gas, particularly ozone, which can be supplied to the treatment object together with the mist through the mist passage. Finally, a reaction gas filter is also contained in the mist channel, with which reaction gas can be removed from the air flow in order to prevent uncontrolled diffusion of the reaction gas.

Document EP 2855754B 1 discloses a water-conducting household appliance having a treatment gas generator and an immersion assembly and a mist generator. A mist passage for introducing the process gas and the mist into the process chamber having the treatment object is communicated with a flush-in module connected to the process chamber through a plurality of water containers or siphon structures.

Document EP 2858545B 1 discloses a water-conducting household appliance having an ozone generator and a mist generator as well as an ozone filter, which are arranged in a mist channel, which forms a substantially closed circuit with the treatment chamber and in which there is also a blower for driving an air flow which conducts ozone and mist to the treatment chamber. For the purpose of guidance to the treatment chamber, the blower is operated such that the air flow flows in the main direction through the mist channel. In order to remove ozone after the treatment of the supplied treatment substance has been completed, the blower is operated in such a way that the air flow flows through the mist channel counter to the main direction. In this way, ozone passes from the treatment chamber in the mist channel to the ozone filter, where it is decomposed, in particular by reaction with activated carbon.

Document EP 2598682B 1 discloses a household appliance having an ozone generator. The ozone generator is supplied with a stream of air spiked with water vapour and ozone is generated in the air stream by the action of ultraviolet light from a respective light source. Then, the air flow thus doped with ozone is supplied to a treatment chamber having the treatment substance so as to treat the treatment substance with ozone.

Standard DIN EN 61770/A11: 2018 require that the household appliance directing the water is connected to a fresh water interface of a supply network for human water, each material of the household appliance that is in contact with such water is not allowed to cause health risks nor any changes in quality, external impression, smell or taste. Therefore, such a household appliance must ensure that no backflow of water into the fresh-water interface occurs, and that the fresh water introduced into the household appliance is only allowed to come into contact with any material or agent, which is a potential risk of damage to the fresh water used by humans, on the downstream side of the respective backflow-preventing safety device. The air section can be used as a safety against backflow; this is a device which can be installed in a pipe system or a hose system and in which the flowing liquid flows from one pipe connection to another over a short-circuit section without pipe connections. Instructions for designing such air sections are known from the standards.

A household appliance is understood here to mean a device which is suitable and intended for achieving the results in terms of the materials sought here when managing private households. In this case, particular attention is paid to domestic appliances which are used to introduce water, i.e. domestic appliances in which water is effective in the desired result, wherein the water must be extracted in particular from a supply network for human water. Such household appliances can be, in particular, dishwashers for washing dishes and laundry care machines for caring for, in particular washing, laundry.

Disclosure of Invention

The object of the invention is to provide a further developed domestic appliance of the type defined at the outset.

In order to solve this task, a household appliance is proposed according to the invention, which additionally has the features according to the embodiments.

Preferred embodiments of the invention are explained in the following description and can also be used in combination with one another, provided that technical considerations permit this, even if this is not explicitly carried out here.

In order to solve this object, a household appliance for treating a treatment substance is accordingly proposed according to the invention, comprising a treatment chamber for receiving the treatment substance, a supply device for supplying water from a fresh water connection to the treatment chamber, and a water tank, wherein the supply device has a front chamber, a first supply line connecting the fresh water connection to the front chamber, and at least one transfer line connecting the front chamber to the treatment chamber, wherein an inlet valve assembly comprising at least one first valve is arranged in the first supply line, and a first air section connected to the front chamber is arranged between the first valve and the front chamber, wherein the water tank is connected to the fresh water connection via a second supply line having a second valve, and wherein furthermore, in the household appliance, a second air section connected to the front chamber is arranged in the second supply line between the second valve and the water tank, and the second supply line opens into the water tank below a predetermined water level.

In the domestic appliance according to the invention, the water tank is therefore connected to the fresh water connection in accordance with the effective provisions for supplying fresh water from the respective supply network, on the one hand, and the air space above the water level in the water tank prevents connection to further air-conducting regions of the domestic appliance, in particular of the front chamber, on the other hand. A safety device in the form of such a second air section, which prevents the backflow of water from the water tank, is combined with the first air section in the following manner: two air sections are connected to the interior of the front chamber and thus to the interior of the process chamber, the first air section being a safety device preventing backflow from the front chamber. The second air section thus maintains the isolation of the system consisting of the water tank and the treatment chamber. The same air pressure is always present on both air sections. Thus, both air sections respond simultaneously in the event of a suck-back.

In principle, the invention can be applied to any type of water-conducting household appliance, especially because the costs required for applying the invention are rather low. In particular, as household appliances of this kind, laundry care machines, such as washing machines and washer-dryers, and dishwashers for cleaning dishes are considered.

In principle, the water tank can be provided in the domestic appliance for any purpose. For example, the function may be to form a counterweight for damping vibrations in certain operating states of the domestic appliance, which vibrations are generated, for example, by a spinning process in a washing machine by whipping or centrifuging. The water tank can also be used for storing water for a specific treatment process, for example for treating a treatment substance by means of steam or mist, which is generated from the stored water by a corresponding generator. Finally, water stored in this way can be used to dilute or dissolve specific agents, such as detergents, rinsing agents and water softeners.

In a preferred embodiment of the invention, the water level corresponds to a minimum filling level of the water tank that is predefined for the use of the water tank. In the context of the use of the household appliance, the filling level of the water tank must therefore be so high that the actual water level is as high as or higher than the water level corresponding to the minimum filling level. This ensures that a blockage of the air space in the water tank exists in each conceivable operating state of the household appliance.

In a further preferred embodiment of the invention, the water tank is connected via a discharge line and a discharge valve to a pump-out line, which is connected to the waste water connection. In this way, water which may remain in the tank can be drained into the waste water connection in order to end the use of the domestic appliance.

In a further preferred embodiment of the invention, the front chamber is covered on the upper side by a cover, and the second air path section is mounted on the cover and has a connection to the front chamber through the cover. It is further preferred that the second air path section is a bulge of the cover, to which two first pipe connections are connected, to which the second supply line is connected. Here, it is still further preferred that the second air path section, the first pipe connection and the cover are integrally formed. In this way, the second air section is largely integrated into the construction of the existing components of the household appliance, and can therefore be produced simply and cost-effectively and integrated firmly into the structure of the household appliance.

In a further preferred embodiment of the invention, the first valve assembly/inlet valve assembly and the second valve are spatially connected to one another, in particular arranged and fixed together on the front chamber. This also allows simple and cost-effective production and a secure integration into the structure of the domestic appliance.

In an additional preferred embodiment of the invention, the water tank and the treatment chamber are connected to a circuit via a process air channel. Further preferably, the circuit is substantially closed on itself. It is also further preferred that the process air duct has a blower by means of which an air flow flowing in the main direction can be formed in the circuit. It is also preferred that the blower is arranged upstream of the water tank with respect to the main direction. In a domestic appliance of this type of construction, it is possible to load the treatment chamber with the treatment substance located therein in that the blower pushes steam or mist generated by the water present in the water tank into the treatment chamber through the process air channel in a main direction. It can also be provided that the blower is operated such that the air flow in the process air duct flows in the opposite direction to the main direction and in this way returns the mist remaining in the treatment chamber after the treatment has been completed to the process air duct for removal.

In a particularly preferred embodiment of the invention, a reaction gas generator for generating reaction gas is arranged in the circuit downstream of the blower and upstream of the process chamber with respect to the main direction, and a reaction gas filter for eliminating reaction gas is arranged upstream of the blower and downstream of the process chamber with respect to the main direction. The treatment substance can thus be treated with a reactive gas which is generated in the process air channel in addition to the steam or mist. The arrangement of the reaction gas generator downstream of the water tank is such that a reaction gas is generated in the steam-or mist-enriched air stream, wherein the reaction gas can be generated by reaction with the water of the steam or mist, if necessary, or the reaction gas is combined with the steam or mist (for example by diffusion of the reaction gas into the droplets of the mist). The treatment may also be arranged such that a reaction takes place on or in the treatment, the reaction requiring the simultaneous presence of water and a reactive gas, wherein the steam or mist ensures that an effective amount of water is present on or in the treatment. Finally, it has also been advantageous to provide a visual indication with a mist which is visible to the user of the household appliance, from the occurrence of which the user can perceive the treatment of the treatment substance with the reactive gas.

In yet another preferred embodiment of the present invention, the reaction gas generator is configured to generate ozone as the reaction gas, and the reaction gas filter is an activated carbon filter. Thus, the invention can be developed independently of or in addition to other treatment processes for the use of ozone, a very effective oxidizing agent, which for example enables the decomposition of recalcitrant dirt and the effective deodorization and disinfection of the treated items, in particular of the laundry.

In a further preferred embodiment of the invention, the water tank belongs to a mist generator, by means of which a mist can be generated, which can be conveyed into the treatment chamber via the process air channel. Further preferably, the mist generator is arranged for generating a cold mist. In addition, an ultrasonic generator for generating cold mist is preferably arranged in the water tank. The cold mist is a dispersion of very fine water droplets in air and is generated only by the action of the ultrasonic waves generated by the ultrasonic generator on the water in the water tank without significantly increasing the temperature of the water or mist. Thus, the mist generator does not require an increased temperature relative to the surroundings of the household appliance in order to form the mist, which increases the operational safety of the household appliance.

In a further preferred embodiment of the invention, the respective household appliance is provided as a laundry care machine for treating laundry as treatment substance. Here, it is further preferred that the household appliance is configured for washing laundry. In addition, a rotatable perforated drum is preferably arranged in the treatment chamber for receiving the laundry. It is further preferred that the front chamber has a flushing assembly, in particular a flushing housing, in which fresh water flowing through towards the treatment chamber can be mixed with treatment agents, in particular laundry care agents such as detergents and softeners.

Drawings

Embodiments of the invention are explained in detail below with the aid of the figures. The figures show:

FIG. 1 is a schematic front view of a household appliance constructed in accordance with the present invention;

fig. 2 is a schematic view of a second air section in the household appliance according to fig. 1; and

fig. 3 is a schematic view in vertical section of a water tank in the household appliance according to fig. 1.

Detailed Description

Fig. 1 shows a schematic first embodiment of a household appliance 1 according to the invention (here embodied as a washing machine 1) for treating a treatment substance 2 (here a laundry 2). The household appliance 1 comprises a treatment chamber 3 for receiving the treatment substance 2, the treatment chamber 3 being configured here as a vibrationally suspended lye container 3 in which a rotatable and perforated drum 4 is arranged, which drum receives the treatment substance 2 and is moved by rotation during the washing or other treatment, for which purpose a catch 5 is also used.

The supply means 7 are able to supply water to the treatment chamber 3 from a fresh water interface 6 connected to a network for supplying water determined for human use (drinking water). The supply device 7 has a front chamber 8 with a cover 9 and a first supply line 10 which connects the fresh-water connection 6 to the front chamber 8, wherein an inlet valve assembly comprising at least one first valve 11 is arranged in the first supply line 10, and a first air section 12 which is connected to the front chamber 8 is arranged between the first valve 11 and the front chamber 8. The pre-chamber 8 is here a flushing chamber 8 which has a flushing assembly arranged therein, which is not shown in fig. 1 for the sake of clarity, in which fresh water flowing through towards the treatment chamber 3 can be mixed with a treatment agent, here in particular a washing or softening agent. The one first valve 11 can here be seen as representative of a plurality or number of valves for sequentially flushing in different amounts of treating agent, which can be in different chamber sections of the flushing assembly. At least one transfer line 13 connecting the pre-chamber 8 with the treatment chamber 3 is used for supplying water to the treatment chamber 3. If necessary, water mixed with the treatment agent can be guided to different regions of the treatment chamber 3 via a plurality of transfer lines 13, in particular in order to achieve uniform wetting of the treatment substance 2.

The pump-out line 14 with the lye pump 15 arranged therein serves to discharge water, washing lye or rinsing lye out of the treatment chamber 3 after the treatment has ended and to discharge it via a waste water connection 16 into a connected network for discharging waste water.

The household appliance 1 further has a mist generator 17 for generating and supplying mist to the treatment chamber 3. The mist generator 17 has a water tank 18 and is provided for generating cold mist in that an ultrasonic generator 19 provided for generating cold mist is arranged below the water level 20 in the water tank 18. The cold mist is the dispersion of the finest water droplets in the air and is generated only by the action of the ultrasonic waves generated by the ultrasonic generator 19 on the water in the water tank 18 without significantly increasing the temperature of the water or mist.

The water tank 18 is connected to the fresh water connection 6 via a second supply line 21, which second supply line 21 has a second valve 22, wherein a second air section 23 is arranged in the second supply line 21 between the second valve 22 and the water tank 18, which second air section is connected to the front chamber 8. Furthermore, the first valve assembly and the second valve 22 are spatially connected to one another, wherein they form in particular a unified valve assembly comprising all first valves 11 and second valves 22.

The water level 20 corresponds to a minimum filling quantity of the water tank 18 that is predefined for using the water tank 18. In the context of the use of the household appliance 1, the filling quantity of the water tank 18 must be so high that the actual water level is as high as or higher than the water level 20 corresponding to the minimum filling quantity. This ensures that a blockage of the air space in the water tank 18 is present in any conceivable operating state of the household appliance 1.

A drain line 24 and a drain valve 25 are provided to allow water remaining in the tank 18 to flow to the pump-out line 14 after treatment.

The mist generator 17 with the water tank 18 and the treatment chamber 3 is connected via a process air channel 26 to a circuit, wherein the circuit is essentially closed on itself. The process air duct 26 also has a blower 27, by means of which an air flow flowing in a main direction 28 can be formed in the circuit. The blower 27 is arranged upstream of the mist generator 17 with respect to the main direction 28. Thereby reducing the application of mist to the blower. If necessary, a blower can also be provided for running the air flow in the opposite direction to the main direction 28 in order to suck the mist out of the treatment chamber 3 almost in the opposite direction.

In addition to the mist generator 17, in the circuit, a reaction gas generator 29 for generating reaction gas is arranged downstream of the blower 27 and upstream of the process chamber 3 with respect to the main direction 28, and a reaction gas filter 30 for eliminating reaction gas is arranged upstream of the blower 27 and downstream of the process chamber 3 with respect to the main direction 28. The reaction gas generator 29 is configured to generate ozone as the reaction gas, and the reaction gas filter 30 is an activated carbon filter 30 on which ozone is decomposed as necessary. Thereby, the treatment object 2 can be treated with ozone, which is generated in the mist channel 26 in addition to the mist. The arrangement of the reactive gas generator 29 downstream of the mist generator 17 is such that the reactive gas is generated in the mist-rich air stream. Ozone is a very effective oxidizing agent which, for example, enables the stubborn dirt to be decomposed and the washing 2 to be deodorized and disinfected independently of or in addition to further treatment processes, such as washing and rinsing.

Fig. 2 shows a schematic view of the second air section 23 in the household appliance 1 according to fig. 1. The front chamber 8, which is not visible in fig. 2, is covered on its upper side by a cover 9, and the second air section 23 is mounted on the cover 9 and has a connection 31 which connects to the front chamber 8 through the cover 9. The second air path section 23 is thus a bulge of the cover 9, to which two first pipe connections 32 are connected, to which the second supply line 21 is connected. The second air passage section 23, the first pipe connection 32 and the cover 9 are integrally formed here, in particular by injection molding.

According to fig. 2, in the air section 23, the ends of the two first pipe connections 32 adjacent to one another are spaced apart from one another by a distance, wherein, according to the respectively mentioned standard DIN EN 61770/a 11: 2018 determine the corresponding distance. Corresponding to the illustration in fig. 1, fresh water flows through the air section 23 from left to right. The fresh water flows out of the first pipe connection 32 on the left via the connection 31 and is free to fly a short distance through the air in order then to enter the first pipe connection 32 on the right and to flow to the water tank 18. If the supply pressure of the fresh water at the fresh water connection 6 changes from positive to negative as a result of a pressure surge, a suction force is generated in the second supply line 21, but this suction force continues only to the second air section 23 and there separates a free-flying jet of water between the ends of the first pipe connection 32. The return of fresh water from the second supply line 21 downstream of the second air section 23 is thereby excluded.

Fig. 3 shows a schematic view of a vertical section of the water tank 18 in the household appliance according to fig. 1. The second supply line 21 is connected to a second pipe connection 33 which is located below the water level 20 which is positioned as intended when the mist generator 17 is in operation and which therefore projects into the region of the water tank 18 which is filled with water for operation. This prevents air enriched with mist and/or ozone from reaching the process air channel 26, to which the region of the water tank 18 not filled with water belongs according to fig. 1, into the second air section 23 and into the front chamber 8. A seal is thus formed, which separates the process air channel 26 from the front chamber 8. This is used in particular to prevent an uncontrolled transfer of ozone from the air space in the process air duct 26 and the water tank 18 into the front chamber 8. Ozone on the one hand has an odor which is generally unpleasant to the touch and on the other hand attacks the mucous membranes in correspondingly high concentrations. This blocking substantially helps to prevent an uncontrolled outflow of ozone from the household appliance 1.

In the household appliance 1 according to the invention, on the one hand, the water tank 18 is connected to the fresh-water connection 6 according to applicable provisions for supplying fresh water from a respective supply network, and on the other hand, the air space above the water level 20 in the water tank 18 prevents connection to other air-conducting regions of the household appliance 1, in particular of the front chamber 8. This safety device in the form of the second air section 23, which prevents the back flow of water from the water tank 18, is combined with the first air section 12 in the following manner: two

air sections

12 and 23 are connected to the interior of the front chamber 8 and thus to the interior of the treatment chamber 3, the first air section being a safety device preventing backflow from the front chamber 8. The second air section 23 thus maintains the isolation of the system consisting of the water tank 18 and the treatment chamber 3. The same air pressure is always present on both

air sections

12 and 23. Thus, both

air sections

12 and 23 respond simultaneously in the event of a suck-back.

List of reference numerals

1 household appliance, washing machine

2 treatment of articles and washing

3 processing chamber

4 roller

5 driving part

6 fresh water interface

7 supply device

8 front chamber

9 cover

10 first supply line

11 first valve

12 first air path section

13 transfer pipeline

14 pump-out pipeline

15 lye pump

16 waste water interface

17 fog generator

18 water tank

19 ultrasonic generator

20 water level

21 second supply line

22 second valve

23 second air path section

24 discharge line

25 discharge valve

26 Process air channel

27 blower

28 main direction

29 reaction gas generator

30 reaction gas filter

31 connecting part

32 first pipe joint

33 second pipe joint.

Claims

1. Household appliance (1) for treating a treatment substance (2), comprising a treatment chamber (3) for receiving the treatment substance (2), a supply device (7) for supplying water from a fresh water connection (6) to the treatment chamber (3), and a water tank (18), wherein the supply device (7) has a front chamber (8), a first supply line (10) connecting the fresh water connection (6) with the front chamber (8), and at least one transfer line (13) connecting the front chamber (8) with the treatment chamber (3), wherein an inlet valve assembly comprising at least one first valve (11) is arranged in the first supply line (10), and a first air section (12) connected with the front chamber (8) is arranged between the first valve (11) and the front chamber (8), wherein the water tank (18) is connected to the fresh water connection (6) via a second supply line (21), wherein the second supply line (21) has a second valve (22), characterized in that a second air section (23) is arranged in the second supply line (21) between the second valve (22) and the water tank (18), wherein the second air section is connected to the front chamber (8), and wherein the second supply line (21) opens into the water tank (18) below a predetermined water level (20).

2. The household appliance (1) according to claim 1, wherein the water level (20) corresponds to a minimum filling quantity of the water tank (18) predefined for using the water tank (18).

3. The household appliance (1) according to any one of the preceding claims, wherein the water tank (28) is connected to a pump-out line (14) connected to a waste water interface (16) through a drain line (24) and a drain valve (25).

4. The household appliance (1) according to any one of the preceding claims, wherein the front chamber (8) is covered on the upper side by a cover (9), and the second air section (23) is mounted on the cover (9) and has a connection (31) which is connected to the front chamber (8) through the cover (9).

5. Household appliance (1) according to claim 4, wherein said second air section (23) is a bulge of said cover (9) to which two first nipples (32) are connected, to which said second supply line (21) is connected.

6. Household appliance (1) according to claim 5, wherein the second air section (23), the first pipe joint (32) and the cover (9) are integrally formed.

7. The household appliance (1) according to any one of the preceding claims, wherein said first valve assembly and said second valve (22) are spatially connected to each other.

8. The household appliance (1) according to any one of the preceding claims, wherein the water tank (18) and the treatment chamber (3) are connected in a circuit by a process air channel (26).

9. Household appliance (1) according to claim 8, wherein said circuit is substantially closed on itself.

10. Household appliance (1) according to one of claims 8 and 9, wherein the process air channel (26) has a blower (27) by means of which an air flow flowing in a main direction (28) can be configured in the circuit.

11. The household appliance (1) according to claim 10, wherein the blower (27) is arranged upstream of the water tank (18) with respect to the main direction (28).

12. Household appliance (1) according to claim 11, wherein in said circuit, downstream of said blower (27) and upstream of said treatment chamber (3) with respect to said main direction (28), a reactive gas generator (29) for generating a reactive gas is arranged, and upstream of said blower (27) and downstream of said treatment chamber (3) with respect to said main direction (28), a reactive gas filter (30) for eliminating a reactive gas is arranged.

13. The household appliance (1) according to claim 12, wherein the reaction gas generator (29) is configured for generating ozone as the reaction gas, wherein the reaction gas filter (30) is an activated carbon filter (30).

14. The household appliance (1) according to any one of claims 8 to 13, wherein the water tank (18) belongs to a mist generator (17) by means of which a mist can be generated, which can be conveyed into the treatment chamber (3) through the process air channel (26).

15. The household appliance (1) according to claim 12, wherein said mist generator (17) is arranged for generating a cold mist.

16. The household appliance (1) according to claim 13, wherein an ultrasonic generator (19) arranged for generating said cold mist is arranged in said water tank (18).

17. The household appliance (1) according to any one of the preceding claims, provided as a laundry care machine (1), for treating laundry (2) as a treatment substance (2).

18. Household appliance (1) according to claim 15, configured for washing said laundry (2).

19. Household appliance (1) according to any of claims 15 and 16, wherein a rotatable and perforated drum (4) is arranged in said treatment chamber (3) for receiving said laundry (2).

20. Household appliance (1) according to any of claims 15 to 17, wherein said front chamber (8) has a flush-in assembly in which fresh water flowing towards said treatment chamber (3) can be mixed with a treatment agent.