RU2605383C2 - Water-consuming domestic appliance with mist generation device - Google Patents

Abstract

FIELD: personal use and household items.

SUBSTANCE: water-consuming domestic appliance (1), in particular, linen processing device (1), includes mist generation device (2). Mist generation device (2) includes container (20) for liquid and ultrasound generator (32). Ultrasound generator (32) is intended for water-containing liquid (25) conversion into mist, which is poured into container (20) for liquid. Container (20) for liquid is made so, that when viewed in working position, in direction from top to bottom, starting from certain specified filling level (26), to which, at least approximately, water-containing liquid (25) is regularly topped up during operation, its inner cross-section (28), oriented perpendicular to vertical direction (22), is reducing.

EFFECT: disclosed is water-consuming domestic appliance with mist generation device.

10 cl, 5 dwg

Description

Technical field

The invention relates to a water-consuming household appliance, in particular to a processing appliance for treating laundry. In particular, the invention relates to the field of laundry treating devices that serve to wash and / or dry laundry, such as, for example, washing machines, clothes dryers and washing and drying machines.

State of the art

From a patent document DE 10 2010 038 619 A1, a household appliance with an ozone generator is known. A well-known household appliance has a treatment area and a steam generator, the steam produced by the steam generator can be conducted to the treatment zone. It is possible to carry ozone produced by the ozone generator into the treatment zone along with steam. It is possible to produce an ozone generator, for example, in the form of an ultraviolet lamp, in particular a UV lamp, or the production of ozone from air using a quiet discharge. As a result of this, a treatment that reduces the number of microorganisms is possible, in which an effect that reduces the number of microorganisms is carried out even at a steam temperature below 60 ° C.

From a patent document DE 10 2010 038 620 A1, a household appliance with an ozone generator is known. The well-known household appliance has a fog generator and an ozone generator. In this case, an ozone-containing fog can be produced by an ozone generator and a fog generator. Then the ozone-containing mist is conducted into the treatment zone. In particular, it is possible to obtain water enriched with ozone. After that, by means of a fog generator, it is possible to produce ozone-containing fog from ozone-enriched water. The fog generator can be made in the form of an ultrasonic aerosol spray.

A household appliance, known from patent document DE 10 2010 038 620 A1, has the disadvantage that the internal volume of the fog generator, which serves as a water intake, occupies a certain installation space. In particular, in water-consuming household appliances such as a washing machine or a tumble dryer, the available installation space inside the housing is already limited. This makes it difficult to carry out an effective treatment with ozone fog. True, it is possible to select the smallest overall dimensions of the fog generator, however, at the same time, the amount of fog produced per unit time is also reduced, which, among other things, increases the processing time. In addition, in the case of tipping of a household appliance, which may occur, for example, during transportation, there is a problem of leakage of water available inside the fog generator.

Disclosure of invention

The objective of the invention is the creation of a water-consuming household appliance of improved design. In particular, the objective of the invention is to indicate such a water-consuming household appliance in which the production of fog, in particular ozone-containing fog, is performed in a way that saves water and optimizes size.

This problem is solved by a household appliance in accordance with an independent claim. Signs and measures presented in the dependent clauses or in the following description or displayed in the attached drawing allow the implementation of preferred improvement options for a household appliance according to the invention.

Therefore, the problem is solved by a water-consuming household appliance, which serves, in particular, as a device for treating linen, moreover, there is provided a fog generating device, the fog generating device comprising a liquid reservoir and an ultrasound generator, the ultrasound generator being designed to turn water-containing into a fog fluid poured into the fluid reservoir, the fluid reservoir, when viewed in a working position, from top to bottom starting from a certain nd filling level to which, at least approximately, the aqueous liquid can regularly topped up during operation, it is arranged at least predominantly decreasing internal cross section oriented perpendicular to the direction from top to bottom.

Under the fog in this case refers to an aerosol, which is a mixture of suspended solid and / or liquid particles and gas. Thus, the term “fog generation device” means a device that is configured to produce such an aerosol. The fog preferably consists of air and water and / or liquid cleaners. Accordingly, the concept of an aqueous liquid, which is based on water and in some cases may also consist solely of water, must also be considered. Moreover, as the aqueous base of such a liquid, not only fresh water is possible, but also water stored as an intermediate carrier, in particular flushing water. In addition, it is possible that the aqueous liquid is first enriched with ozone, and then converted into fog. However, it is also possible to mix the mist with gas, in particular with ozone, in order to form the desired mixture in this way.

Before bringing the water-consuming household appliance into action, it is installed properly and thereby brought into working position. This working position, as a rule, is essential for functioning. In particular, gravity is usually used to bring water to the proper places of a water-consuming household appliance. For example, a provided washing solution tank is possible in which a suction pipe is connected to the lower outlet of the washing solution tank. Then, in the operating position, it is possible to empty the washing solution tank through the pumping line. The top-down direction for the device is preferably determined so that in the operating position it is at least substantially parallel to the direction of gravity.

It is preferable that the fluid reservoir be such that when viewed in the operating position in a downward direction, starting from a predetermined fill level, the inner cross-section of the reservoir decreases monotonically. Thus, the internal cross section decreases in the direction from the bottom up, and in some areas the internal cross section may also remain constant. In addition, the reservoir for the liquid is preferably made so that when it is in the working position, if we consider it in the direction from top to bottom, starting from a given level of filling, the internal cross section of the reservoir decreases strictly monotonously. In this embodiment, the inner cross section decreases continuously, and such portions in which the inner cross section remains constant in a downward direction are not provided. An advantage of such embodiments of the fluid reservoir is that it is possible to obtain a fluid surface that is relatively large relative to the volume of the fluid reservoir. In particular, due to this, a large surface is realized on which the formation of fog occurs. As a result of this, the installation space is optimally used. In addition, the amount of liquid required to turn a certain amount of water-containing liquid into a fog per unit time is reduced. In particular, when the ultrasonic element is located in the bottom of the liquid reservoir, it is possible to reduce the internal cross section to the size that is required for the ultrasonic element.

It is also preferable that the liquid reservoir be constructed in such a way that, when viewed in the operating position in a downward direction, starting from a predetermined filling level, there is at least one extended portion in which the internal cross section decreases in a strictly monotonous direction from top to bottom. In particular, if the ultrasonic element is located on the bottom of the liquid reservoir, then in this embodiment, the preferred propagation of ultrasonic waves emitted into the water to the surface of the aqueous liquid. Thus, the conversion of an aqueous fluid to fog is effective.

However, it is also preferable that the liquid reservoir be such that when viewed in the operating position in a downward direction, starting from a predetermined filling level, there is at least one convex portion in which the internal cross section decreases in a strictly monotonous direction from top to bottom. Thus, in this embodiment, in the convex portion, the steepness of the inner wall increases in a downward direction. This means that the internal cross section, when viewed from the top to the bottom, is first reduced relatively sharply, and then less. As a result of this, a bell-shaped execution is realized. In this case, in particular, in the case of a club-shaped distribution of the intensity of the ultrasound source placed in the bottom of the liquid tank, without further changing the capacity of the liquid tank, a further increase in the surface is achieved on which effective fogging occurs.

It is also preferable that the liquid reservoir be such that when viewed in the operating position in a downward direction, starting from a predetermined filling level, there is at least one concave portion in which the internal cross section decreases in a strictly monotonous direction from top to bottom. The concave embodiment may be illustrated with a concave mirror. In particular, with an ultrasonic element which, in whole or in part, points in the direction from top to bottom, the focusing of the ultrasonic waves by the concave portion thus produced is possible. As a result of this, a particularly effective conversion to fog is achieved, since the curvature of the concave portion allows, within certain limits, a preferred setting.

It is also preferable that the liquid reservoir be constructed in such a way that when it is examined in the working position from top to bottom, starting from a given filling level, there is at least one such section, which is made as part of the surface of the rotation ellipsoid, and in which the internal cross section is strictly monotonously decreases in the direction from top to bottom. This embodiment implements a concave portion. As a result of this, it is possible to use the principle of the concave mirror with respect to the ultrasonic waves of the ultrasonic element in order to purposefully achieve the formation of fog, for example, on the elliptical surface of an aqueous fluid.

Thus, it is also preferable that the ultrasound generator has at least one ultrasonic element such that the activation area of the ultrasonic element is located in the fluid reservoir at least at a predetermined filling level, the activation area of the ultrasonic element facing at least substantially in the upper direction way down. In this case, if necessary, it is possible to adapt to the design of the reservoir for the liquid by purposefully creating an inclination relative to the vertical direction from top to bottom.

In addition, it is preferable that there is a partition, which is located at a predetermined filling level in the liquid reservoir, and horizontal separation is provided by the partition of the region of the ultrasonic element in which the ultrasonic element is located, from the fog region in which the aqueous liquid is at least essentially turns into fog. As a result of this, it is possible to create fog arising in the fog region in a concentrated form above the surface of the water.

The ultrasound generator preferably contains only one ultrasonic element. However, it is also possible that there are several ultrasonic elements in the ultrasound generator. It is also possible that one ultrasonic element is located at a predetermined filling level, while another ultrasonic element is located in the bottom of the liquid reservoir, in which case the bottom of the liquid reservoir is at least substantially formed by the activation surface of this second ultrasonic element.

Preferred embodiments of the invention are explained in more detail in the following description based on the accompanying drawings, in which the corresponding elements are provided with uniform designations. Showing:

Brief Description of the Drawings

FIG. 1 is a water consuming household appliance according to a first embodiment in a schematic fragmentary view;

FIG. 2 is a fog generating device of a water consuming household appliance of FIG. 1, in accordance with a second embodiment, in a schematic sectional view;

FIG. 3 is a fog generating device of a water consuming household appliance of FIG. 1, in accordance with a third embodiment, in a schematic sectional view;

FIG. 4 - the fog generating device shown in FIG. 3, in a schematic representation, a view in the direction indicated by IV, and

FIG. 5 illustrates the fog generating device of FIG. 4, in a schematic sectional view along the line indicated by V.

The implementation of the invention

In FIG. 1 shows a water consuming household appliance 1 in a schematic fragmentary view in accordance with a first embodiment. It is possible, in particular, to design a household appliance 1 in the form of a processing device for treating laundry and serving, inter alia, for washing and / or drying laundry. In particular, it is possible to implement the household appliance 1 as a washing machine, a washer-dryer or a tumble dryer. However, with appropriate modification, the household appliance 1 according to the invention is also suitable for other applications.

The water consuming household appliance 1 has a mist generation device 2 and a processing gas generator 3. The processing gas generator 3 in this embodiment is configured as an ozone generator 3. In addition, the water consuming household appliance 1 has a processing area 4, which is provided within the processing tank 5. The processing tank 5 in this embodiment is designed as a washing solution tank 5.

The household appliance 1 has a fresh water supply 6, which, before putting the appliance into operation, is connected, for example, to the water supply system of the sanitary equipment of the building. Thus, through the supply of fresh water 6, it is possible to supply fresh water to the household appliance 1. At the same time, a shut-off valve 7 and a shut-off valve 8 are provided, which are controlled, for example, by means of a control system not shown in accordance with the sequence of program operations.

When the shut-off valve 7 is opened, fresh water from the fresh water supply 6 through the conduit 9 and the free open section 10 is conducted into the wash tray 11. As a result, the laundry treatment means, in particular the detergent laid in the wash tray 11, is introduced through the inlet pipe 12 to processing area 4. Thus, it becomes possible to wash in the processing area 4 of the laundry loaded there, which is produced, as a rule, using a drum not shown. After the washing process, the washing solution through the pumping line 13, in which the pump 14 is located, is pumped from the treatment area 4 to the outlet 15 of the waste water. By subsequently supplying fresh water to the treatment area 4, it is also possible to connect one or more rinsing processes.

Before activating the household appliance 1, it is installed in such a way that it is in the working position. In this case, the working position is set relative to the direction of gravity 16, or in accordance with the direction of gravity acceleration 16. This ensures, among other things, the free passage of water inside the household appliance 1. For example, due to this, fresh water entering the flushing tray 11 is transported through a downwardly directed pipe 12 of the supply pipe to the treatment area 4. In addition, in this way, when pumping the pump 14, the waste water, at least almost completely, flows into the pipe 13 for pumping.

The fog generating device 2 has a fluid reservoir 20. The fluid reservoir 20 has an axis 21 with respect to which the fluid reservoir 20 is axisymmetric.

In addition, in this embodiment, a certain direction 22 is selected for the household appliance 1 from top to bottom. Such a possible direction 22 from top to bottom is different in that it points down and that, for example, it is possible to transport freely flowing water under the influence of gravity in this direction. The downward direction 22 preferably indicates at least substantially in the direction of gravity acceleration 16. In particular, it is possible a direction 22 from top to bottom, exactly coinciding with the direction 16 of the acceleration of gravity, or, accordingly, oriented parallel to the direction 16 of the acceleration of gravity. In the operating position of the household appliance 1, the direction 22 from top to bottom is usually oriented perpendicular to the upper side of the housing not shown.

The reservoir 20 for the liquid is located so that in the working position, the direction 22 from top to bottom is on the axis 21 of the reservoir 20 for the liquid, or, accordingly, that the direction 22 is from top to bottom parallel to the axis 21.

When the shut-off valve 8 is opened, fresh water from the fresh water supply 6 through the pipe 23 enters the interior 24 of the liquid tank 20. As a result of this, the interior space 24 is partially filled with water-containing liquid 25. Under the water-containing liquid 25, simply fresh water can be meant. However, it is also possible to add appropriate substances to the fresh water supplied. For example, as a result of this, it is possible to dissolve 25 aromatic substances in an aqueous liquid. In a modified embodiment, it is also possible to obtain an aqueous liquid 25 by adding ozone.

An aqueous liquid 25 is poured to a predetermined filling level 26. Moreover, during operation, using the appropriate control system, it is possible to add fresh water in such a way that the water-containing liquid 25 is always filled in the liquid tank 20 at least up to the filling level 26.

The reservoir 20 for the liquid has a conical section 27. In this case, the conical section 27 narrows in the direction 22 from top to bottom. The inner cross section 28 of the inner space 24 of the fluid reservoir 20 in the operating position decreases, starting from a predetermined filling level 26 in the direction 22 from top to bottom to the bottom 29 of the fluid reservoir 20, since the tapered portion 27 extends from the filling level 26 to the bottom 29. When this inner cross-section 28 in the area from the level 26 of the filling to the bottom 29 decreases strictly monotonously.

Thus, the reservoir 20 for the liquid, if we consider it in the working position, starting from a predetermined filling level 26, to which the aqueous liquid 25 is regularly replenished during operation, is made with an internal cross section 28 oriented perpendicular to the vertical direction 22, decreasing in the direction 22 top down. In a modified embodiment, short portions may also preferably be provided in which the inner cross section 28 does not change in the direction 22 from top to bottom, or in which the inner cross section 28 even extends somewhat, which occurs, for example, at the ribs or at the joints, in particular, welds.

Thus, the design of the fluid reservoir 20 with a tapered portion 27 is an embodiment of the fluid reservoir, which, when viewed in the operating position, starting from a predetermined filling level 26, in the direction 22 from top to bottom, is made with a strictly monotonously decreasing internal cross section . If one or more sections with a constant internal cross section are additionally provided, then the fluid reservoir is made with a monotonously but not strictly monotonously decreasing internal cross section.

The bottom 29 of the liquid reservoir 20 in this embodiment is formed by the activation surface 30 of the ultrasonic element 31 of the ultrasound generator 32. When the ultrasonic element 31 is activated, the water-containing liquid 25 is sprayed into small droplets on its surface 33 so that a mist 34 forms above the surface 33. Ultrasonic element 31 may have, for example, a piezoelectric oscillatory element. Moreover, in the inner space 24 above the surface 33 there is still a residual volume in which the fog 34 accumulates.

The treatment gas generator 3 includes a fan that, through a pneumatic pipe 35, delivers the produced treatment gas to a volume located above the surface 33 of the inner space 24. Then, through another pneumatic pipe 36, the mist 34 mixed with the treatment gas is conducted to the treatment tank 5 . Thus, it is possible in the processing area 4 to process, for example, the laundry inside the treatment tank 5 enriched in mist 34, in particular ozone mist 34. In this case, the corresponding modifications are admissible. In one of the modifications, for example, it is possible to carry out in the processing region 4 only sprayed water-containing liquid 25 in the form of a mist 34.

Due to the conical shape of the section 27, a preferred propagation of the ultrasonic wave produced by the ultrasonic element 31 is created to the surface 33 of the liquid 25. In particular, a club-shaped shape of the distribution of the intensity of the ultrasonic waves, preferably extending upward, and the area covered by ultrasound, is expanding accordingly. In this case, by choosing a piezocrystal or similar element and a suitable sound frequency for it, it is possible to adapt to the appropriate application, in particular, to the size of the liquid tank 20.

The funnel-shaped embodiment of the fluid reservoir 20 allows the surface 33, which is large compared to the activation surface 30, to serve as a soothing zone.

Thus, it is possible to optimize the size of the liquid tank 20, since the volume of the inner space 24 is optimized with respect to the form of its execution and therefore can be relatively small, without compromising its functional efficiency.

In addition, on a relatively large surface 33, or on a correspondingly large area of the internal cross section 28 in the region of the fill level 26, there is enough space for further components inside or outside. This makes it possible, for example, to easily implement appropriate sensor systems and / or actuators for monitoring water levels or similar tasks.

In FIG. 2 is a schematic sectional view of a mist generating device 2 of a water consuming household appliance 1 shown in FIG. 1, in accordance with a second embodiment In this embodiment, the fluid reservoir 20 has a convex portion 37. In this embodiment, the convex portion 37 extends from the fill level 26 to the bottom 29 of the fluid reservoir 20. Moreover, in addition, the convex section 37 is made so that the inner cross section 28 from the filling level 26 to the bottom 29 decreases strictly monotonously. In addition, the convex section 37 is made axisymmetric with respect to the axis 21. Thus, on the convex section 37, curved side surfaces are formed in its profile, protruding by the bulges into the interior space 24. A liquid reservoir 20 is obtained having a bell shape to some extent, starting from bottom 29 to fill level 26. Thereby, a preferred form of activation of the produced ultrasonic waves is achieved with respect to the respective applications and the club-shaped distribution of their intensity, which makes it possible to efficiently convert the water-containing liquid 25 into fog on its surface 33.

In FIG. 3 shows a sectional view of a mist generating device 2 of a water consuming household appliance 1 shown in FIG. 1, in accordance with the second embodiment In this embodiment, the fluid reservoir 20 is in a working position, when viewed in the direction 22 from top to bottom, starting from a predetermined filling level 26, is made with a concave portion 38 in which the inner cross section 28 of the inner space 24 decreases in the direction 22 from top to bottom strictly monotonously. The concave portion 38 in this embodiment forms a bottom 29 made in a concave shape.

In addition, in this embodiment, the concave portion 38 is formed as part 38 of the surface of the ellipsoid of revolution. Moreover, as also described by figures 4 and 5, the reservoir 20 for the liquid is not axisymmetric with respect to axis 21.

In addition, the fog generating device 2 in this embodiment has an ultrasonic element 40 located in the region of the fill level 26. The activation surface 41 of the ultrasonic element 40 is thus approximately at a predetermined filling level 26. However, in this case, the activation surface 41 during operation is lower than the surface 33 of the aqueous liquid 25 in order to make it possible to efficiently produce ultrasonic waves in the liquid 25. The activation surface 41 is turned downward in the direction 22.

In addition, a baffle 42 is provided, which is located at fill level 26 in the fluid reservoir 20. The partition 42 separates horizontally in the region of the surface 33 of the liquid 25, the region 43 of the ultrasonic element in which the ultrasound element 40 is located, from the region 44 of the fog, in which fog 34 is produced by spraying the water-containing liquid 25. At the same time, the bottom 29 is made thanks to the shape of the concave section 38 so that sound waves emanating from the activation surface 41 of the ultrasonic element 40 are directed to the fog region 44 and concentrated there. This is schematically illustrated by the arrows depicted in FIG. 3. In this case, it is the shape of the reservoir 20 for the liquid, which differs from rotational symmetry about the axis 21, contributes to the separation into the region of the ultrasonic element 43 and the region 44 of the fog.

During operation, level 45 of activation surface 30 is approximately at fill level 26. Moreover, the level 45 is so lower than the filling level 26 that, if hysteresis of the adjustment is possible, the activation surface 30 is always below the surface 33 to fill the fluid reservoir 20. This means that the lower hysteresis level around fill level 26 is set above level 45.

In FIG. 4 shows the fog generating device 2 of FIG. 3, in a schematic representation in the form determined by direction IV. The reservoir 20 for the liquid is shown open. Moreover, in FIG. 4 shows the inner cross section 28 of the reservoir in the upper region, the inner cross section 28 being elliptical. The elliptical shape of the inner cross section 28 is determined by the major axis 46 and the minor axis 47. In this case, the lengths of the major axis 46 and the minor axis 47 when viewed in the direction 22 from top to bottom, starting from fill level 26, are strictly monotonously reduced.

In FIG. 5 shows the fog generating device of FIG. 4, in a schematic sectional view along the line indicated by V. The ultrasonic element 40 is located in the region 43 of the ultrasonic element. In this case, the level 45 of the activation surface 41 of the ultrasonic element 40 is slightly lower than the filling level 26. The level 48, which reaches the partition 42 in the direction 22 from top to bottom, lies even lower than the level 45 of the ultrasonic element 40. As a result, the partition 42 provides a reliable separation between the region 43 of the ultrasonic element and the region 44 of the fog. Both pipelines 35, 36 preferably flow into the mist region 44 above the surface 33 of the aqueous fluid 25 in the interior space 24.

When implementing a household appliance 1, several modifications are possible. In particular, rotationally asymmetric embodiments of the fluid reservoir 20 can also be based on a rectangular, in particular square, internal cross-section 28. As a result of this, in particular, pyramidal or truncated pyramid-shaped shapes are achieved. In addition, a suitable curvature of one or more walls may additionally be provided. In this case, it is possible to vary the angle of inclination or curvature of individual walls. In particular, it is possible to provide curvature for only one wall. In addition, to use the principle of operation of a concave mirror, in particular a parabolic reflector, which directs sound waves from an ultrasonic element 40 located in the region 43 of the ultrasonic element to the region 44 of the fog, another shape other than a fragment of a rotation ellipsoid is also possible. In an embodiment in the form of a fragment of a rotation ellipsoid, the ultrasonic element 40 is preferably located at one of its foci, so that the generated sound waves are concentrated in the other focus of the rotation ellipsoid. In addition, in this embodiment, the travel time for all wave paths is the same. The path of sound waves constructed in such a way allows one to further reduce the necessary volume of the internal space 24. In addition, the arrangement of the ultrasonic element 40 in the internal space initially allows avoiding possible leaks in the bottom 29. Moreover, it is possible to choose the bottom 29 of the reservoir 20 for the liquid according to its properties in particular, according to the material chosen and the surface quality, which suitably meet the requirements for sound reflection and for slight absorption of ultrasound waves of waves.

In addition, due to the small amount of internal space 24 to the filling level 26, filling is quickly performed at the start of operation when the fluid reservoir 20 is empty. Moreover, when emptying by means of a shut-off valve 50 or the like, the advantage is a short emptying time. For example, emptying may occur through a conduit 51, in which a shut-off valve 50 is located and which flows into the conduit 13 for pumping out. In addition, due to the small amount of internal space 24, leakages are minimized with the liquid tank 20 not emptied, if the household appliance is tilted, for example, for transportation.

The invention is not limited to the described embodiments.

Designations

1 water consuming household appliance

2 fog generating device

3 processing gas generator

4 processing area

5 processing tank

6 fresh water supply

7, 8 check valve

9 pipeline

10 free open area

11 flush tray

12 inlet pipe

13 pumping line

14 pump

15 waste water outlet

16 direction

20 fluid tank

21 axis

22 downward direction

23 pipeline

24 interior space

25 water-containing liquid

26 fill level

27 conical section

28 internal cross section

29 bottom

30 activation surface

31 ultrasonic element

32 ultrasound generator

33 surface

34 fog

35, 36 pipeline

37 convex section

38 concave section

40 ultrasonic element

41 activation surface

42 partition

43 area of the ultrasonic element

44 area of fog

45 level

46 major axis

47 minor axis

48 level

50 shutoff valve

51 pipelines.

Claims (10)

1. A water-consuming household appliance (1), in particular a laundry treating appliance (1), with a treatment area (4) and a fog generating device (2), the fog generating device (2) comprising a liquid reservoir (20) and a generator (32) ultrasound, and the generator (32) of ultrasound is designed to turn into fog water-containing liquid (25), poured into a reservoir (20) for liquid, and conversion into fog occurs on the surface (33) of water-containing liquid (25), and the supply atomized water-containing liquid (25) in the form of fog (34) in volume part (4) of the treatment, characterized in that the reservoir (20) for the liquid, when considering it in the working position, starting from a certain predetermined filling level (26), to which at least approximately an aqueous liquid (25) can regularly topped up during operation, is made with at least mainly decreasing in the direction (22) from top to bottom of the inner cross section (28), oriented perpendicular to the direction (22) from top to bottom. 2. A household appliance according to claim 1, characterized in that the reservoir (20) for the liquid is made in such a way that when viewed in the operating position in the direction (22) from top to bottom, starting from a predetermined filling level (26), the internal cross section (28) the reservoir decreases monotonously, in particular, strictly monotonously decreases. 3. A household appliance according to claim 1, characterized in that the reservoir (20) for the liquid is made in such a way that, when viewed in the operating position in the direction (22) from top to bottom, starting from a predetermined filling level (26), is provided for at least one conical section (27), in which the internal cross section strictly monotonously decreases in the direction (22) from top to bottom. 4. A household appliance according to claim 1, characterized in that the reservoir (20) for the liquid is made in such a way that, when viewed in the operating position in the direction (22), from top to bottom, starting from a predetermined filling level (26), at least at least one convex section (37), in which the internal cross section (28) strictly monotonously decreases in the direction (22) from top to bottom. 5. A household appliance according to claim 1, characterized in that the reservoir (20) for the liquid is made in such a way that when it is examined in the operating position in the direction (22) from top to bottom, starting from a predetermined filling level (26), at least at least one concave section (38), in which the inner cross section (28) strictly monotonously decreases in the direction (22) from top to bottom. 6. A household appliance according to claim 1, characterized in that the reservoir (20) for the liquid is made in such a way that, when viewed in the operating position in the direction (22), from top to bottom, starting from a predetermined filling level (26), at least at least one section (37, 38), which is made in the form of a part of the surface of the ellipsoid of revolution, and in which the internal cross section (28) strictly monotonously decreases in the direction (22) from top to bottom. 7. A household appliance according to claim 1, characterized in that the ultrasound generator (32) comprises at least one ultrasonic element (40), and the activation surface (41) of the ultrasonic element (40) is located at least approximately filling level (26) in the fluid reservoir (20), the activation surface (41) of the ultrasonic element (40) extending at least substantially in the direction (22) from top to bottom. 8. A household appliance according to claim 7, characterized in that a partition (42) is provided, which is located at a predetermined fill level (26) in the liquid reservoir (20), while the partition (42) horizontally separates the ultrasound region (43) the element in which the ultrasonic element (40) is located, from the fog region (44) in which the atomization of the aqueous liquid (25) is ensured, at least substantially. 9. A household appliance according to one of claims. 1-8, characterized in that the ultrasound generator (32) contains at least one ultrasonic element (31), while the bottom (29) of the liquid reservoir (20) is formed by at least essentially an activation surface (30) ultrasonic element (31). 10. A household appliance according to one of claims. 1-8, characterized in that a processing gas generator (3) is provided for generating the processing gas, and a mixture comprising sprayed liquid (25) and the processing gas generated by the generator (3) is provided to the treatment area (4).

Images