SIPHON FOR A LAUNDRY CARE APPLIANCE

Description

[0001] The present invention relates to a siphon for a laundry care appliance and a laundry care appliance.

[0002] The water supply for laundry care appliances is subject to various normative and practical functional requirements. For example, DIN EN 61770 requires the provision of a safety device that prevents used or contaminated water from being sucked back into the water supply line, and thus particularly into a household's drinking water supply, in the event of negative pressure in the water supply line, for example. Furthermore, it is desirable to be able to prevent water from backing up into the water supply line, for example in the event of a blocked drain in the laundry care appliance or downstream of it. In the prior art, it is common practice to provide an air gap for this purpose, which allows pressure equalization and thus prevents contaminated water from being sucked in.The air gap interrupts the water supply line, which is otherwise closed to the outside, and creates a connection to the environment. For example, the air gap can be located in a detergent drawer between the dispenser tray and a water supply. However, due to the connection to the environment, there is always the possibility that, for example, condensed water or hot steam from a treatment chamber of the laundry care appliance could escape into the environment. This can cause damage to components of the laundry care appliance and / or objects in the surrounding area. Furthermore, the escape of condensed water, steam, etc. can cause inconvenience for a user of the laundry care appliance. In the prior art, it is therefore common practice to provide a siphon to prevent such escape.Typically, the siphon is arranged below the detergent drawer and / or in an inlet bellows and is in particular U- or V-shaped.

[0003] However, especially in light of automatic dosing systems, which may no longer require a detergent drawer at all, it is desirable to find alternative and, if possible, optimized solutions. In particular, it is advantageous to reduce the space required by conventional systems consisting of a siphon and / or dispenser tray in order to use the freed-up space for other purposes and / or to reduce the size of the laundry care appliance.

[0004] US 2019 024 293 AA shows a laundry care appliance with a detergent dosing tray. The dosing tray sits in a receiving tray, and the arrangement of the two forms a siphon that ensures that the receiving tray is almost completely emptied.

[0005] US 2009 260 404 AA also shows a laundry care appliance with a siphon formed in a detergent chamber and used to almost completely empty this chamber.

[0006] It is therefore an object of the present invention to provide an alternative, reliable and space-saving device which can equally prevent the back-suction of used or contaminated water into the water supply line and the escape of condensed water, steam, etc. into the environment.

[0007] This object is achieved by a siphon having the features of claim 1 and a laundry care appliance having the features of claim 10. Further advantages and features of the invention emerge from the subclaims as well as the description and the attached figures.

[0008] According to a first aspect of the present invention, a siphon is provided for installation in a laundry care appliance with or without a detergent drawer. The siphon comprises a first tubular element comprising a first end and a second end in a longitudinal direction, a second tubular element arranged and / or arrangeable at least partially in the first tubular element, having a siphon end facing the first end and spaced therefrom, and an outer end opposite the siphon end, a cover plate arranged in the second tubular element between the siphon end and the outer end and sealing the second tubular element, a third tubular element arranged at least partially in the first tubular element and at least partially in the second tubular element, having an inlet end facing the second end and the cover plate and spaced from the cover plate, and an outlet end opposite the inlet end,and a fluid inlet opening leading into a region between the first tubular element and the second tubular element and an overflow opening leading from this region, wherein the first tubular element comprises a base plate with a base opening at its first end, wherein the third tubular element extends fluid-tightly through the base opening, wherein the overflow opening is arranged between the inlet end of the third tubular element and the fluid inlet opening, viewed in the longitudinal direction.

[0009] The siphon according to the invention can be provided for laundry care appliances with an automatic detergent dosing function, in particular for laundry care appliances without a detergent drawer. Advantageously, the siphon according to the invention can offer a very compact and structurally simple design. In particular, it has been shown that a narrower siphon width can be realized compared to devices used in the prior art. For example, the siphon according to the invention, including its fluid inlet opening and its overflow opening, can be approximately 40% narrower than a corresponding device from the prior art. The tubular design of the siphon components also enables reliable permeability with lower flow resistance compared to the prior art. The siphon can optionally also be used for laundry care appliances with a detergent drawer.

[0010] The longitudinal direction preferably corresponds substantially to the direction of gravity when the siphon is installed in a laundry care appliance and the laundry care appliance is set up ready for use. The term "substantially" here and below refers in particular to a deviation of less than 10°, preferably less than 5°, and particularly preferably less than 3°, whereby a deviation of 0° is also included in any case. For other specifications, in particular distance, ratio, area, or length specifications, "substantially" means a deviation of less than 15%, preferably less than 10%, particularly preferably less than 5%. The longitudinal direction is preferably aligned substantially parallel to a central axis of at least one section of the first tubular element. The section comprises in particular the part of the first tubular element in which the second tubular element and / or the second tubular element are arranged.According to a preferred embodiment, the first tubular element can be straight, wherein in particular the central axis of the first tubular element can be aligned substantially parallel to the longitudinal direction. Within the scope of this invention, a transverse direction can indicate a direction perpendicular to the longitudinal direction. The transverse direction can be identical to a radial direction, in particular if the first, second and / or third tubular element is cylindrical and / or has a cross-section that is at least partially circular. The first tubular element preferably has an extension in the transverse direction which is in a ratio of 0.3 to 1.5, preferably 0.6 to 1.0, particularly preferably 0.8 to 0.9 to an extension of the first tubular element in the longitudinal direction. This ratio can be particularly advantageous with regard to the compactness of the first tubular element.In addition, a ratio of 0.8 to 0.9 can enable good permeability and / or a low risk of clogging of the siphon. The first end can preferably be arranged opposite the second end. Preferably, a cross-sectional area of ​​the first end can be arranged substantially parallel to a cross-sectional area of ​​the second end. In the context of this invention, the cross-sectional area of ​​an end can be assumed to be the area delimited by the circumference of the end, in particular a flat area. In particular, in the case of a substantially straight pipe element, the normal of the cross-sectional area can run parallel to the straight extension of the pipe element. Alternatively and / or additionally, the normal of the cross-sectional area can run parallel to the central axis of the pipe element in the region of the respective end. The first pipe element can have, at least in sections, a substantially constant internal cross-section.The internal cross-section of the first tubular element can be substantially constant over the entire area of ​​the first tubular element, with the exception of a section at the first end and / or a section at the second end. This section can, for example, comprise 1% to 15% of the longitudinal extent of the first tubular element. For example, the first tubular element can have a smaller and / or tapered internal cross-section in the first end and / or second end sections.

[0011] The second pipe element can have a siphon end and an outer end opposite the siphon end. Preferably, at least the section of the second pipe element which is arranged in the first pipe element can be designed to be substantially straight, in particular substantially parallel to the longitudinal direction. This can advantageously be a design which minimally impedes the flow through the siphon. In other words, flow resistance can thus be kept low. Particularly preferably, the entire second pipe element can be designed to be substantially straight. In particular, a central axis of the second pipe element can run substantially parallel to the longitudinal axis. This can enable a siphon which is particularly easy to manufacture and saves space. Preferably, the siphon end can be arranged in the first pipe element. The siphon end faces the first end."Facing" can mean, in particular, that a normal of a cross-sectional area of ​​the siphon end, pointing away from the second pipe element, points to a cross-sectional area of ​​the first end and / or that the normal or an extension of the normal intersects the cross-sectional area of ​​the first end. Preferably, the normal can be arranged centrally on the cross-sectional area. An analogous definition can also be applied to other ends that are referred to as facing each other. The cross-sectional area of ​​the siphon end can be arranged and / or can be arranged substantially parallel to the cross-sectional area of ​​the first end of the first pipe element."Arrangable," here with reference to the second pipe element and / or the siphon end, can be understood within the scope of this invention to mean that the second pipe element and / or the siphon end as well as the first pipe element are designed such that these two pipe elements are or can be joined together in a predetermined manner by at least one corresponding securing element. This can apply in particular if the first pipe element and the second pipe element are separate components. Securing elements can, for example, be recesses and / or projections of the first pipe element and / or the second pipe element. For example, the first pipe element can have a first securing element, and the second pipe element can have a matching second securing element. Preferably, the at least one securing element can be arranged at the outer end and / or at the second end or in the region of the second end."In the region of the second end" can mean that the at least one securing element is closer to the second end than to the first end, but is spaced from the second end. This allows for a secure hold between the pipe elements. The siphon end can comprise a retaining tab, in particular an arcuate one. The retaining tab can preferably be rigid. The retaining tab can, in particular, be designed to extend circumferentially around the entire circumference of the outer end and / or at least around a large part of the circumference of the outer end. The retaining tab can protrude radially outward from the second pipe element in an arcuate manner. The retaining tab can comprise two sections that are essentially perpendicular to each other. The retaining tab can connect to the second pipe element at a substantially right angle. The first pipe element can have a projection, in particular extending circumferentially around at least part of the circumference of the first pipe element.The projection can be spaced from the second end and / or arranged closer to the second end than to the first end. The distance of the projection from the second end, viewed in the longitudinal direction, can be in a ratio of 0.01 to 0.49, preferably 0.05 to 0.4, particularly preferably 0.1 to 0.2, to the total extension of the first tubular element in the longitudinal direction. The projection can be designed to cooperate with the retaining tab when the first and second tubular elements are assembled. In particular, the projection can be designed to limit the positioning of the retaining tab and / or to fix the retaining tab. The outer end and the second end can be and / or can be arranged to be substantially flush with one another, viewed in the longitudinal direction.Preferably, the second pipe element and / or at least the section of the second pipe element arranged in the first pipe element can be spaced apart from the first pipe element in the transverse direction, in particular can be spaced apart substantially uniformly in all directions transverse to the longitudinal direction. The second pipe element can preferably have an extension in the transverse direction which is in a ratio of 0.2 to 1.5, preferably 0.5 to 1.0, particularly preferably 0.7 to 0.9 to an extension of the second pipe element in the longitudinal direction. In particular, in interaction with the above-mentioned size ratio of the first pipe element and / or with the size ratios of the third pipe element mentioned below, this ratio can be particularly favorable with regard to good permeability of the siphon.

[0012] The third pipe element can have an inlet end and an outlet end. The inlet end and the outlet end can be diametrically opposite one another in the longitudinal direction. This ensures good fluid flow between both ends. The inlet end can preferably be arranged in the first pipe element and / or in the second pipe element. The cross-sectional area of ​​the inlet end can be arranged parallel to the cross-sectional area of ​​the second end and / or the first end of the first pipe element. The longitudinal extension of the section of the third pipe element arranged in the second pipe element can be in a ratio of 0.1 to 2.0, preferably 0.5 to 1.5, particularly preferably 1.0 to 1.2, to a distance between the base plate and the siphon end in the longitudinal direction. Advantageously, with such a ratio, clogging of the siphon, for example by laundry treatment agents, can be particularly effectively prevented.Preferably, at least the section of the third pipe element which is arranged in the first pipe element and / or in the first pipe element can be designed to be substantially straight, in particular substantially parallel to the longitudinal direction. If the first pipe element and at least the sections of the other two pipe elements which are arranged in the first pipe element are designed to be straight, a design which hardly impedes the flow through the siphon can advantageously be enabled. Particularly preferably, the entire third pipe element can be designed to be substantially straight. In particular, a central axis of the third pipe element can run substantially parallel to the longitudinal axis. A straight third pipe element can enable a largely unimpeded flow through the third pipe element, which forms the last section of the siphon, in particular as seen in the flow direction.Preferably, the center axes of the first, second, and third tubular elements can run substantially parallel to one another, at least in some regions. In other words, the longitudinal extent of the three tubular elements can be substantially parallel to one another, at least in some regions. The cross-sections of the three tubular elements can have a qualitatively similar, in particular substantially identical, geometric shape, wherein the dimensions of the cross-sections can preferably differ. The cross-sectional area of ​​the second tubular element can be larger than the cross-sectional area of ​​the first tubular element and smaller than the cross-sectional area of ​​the first tubular element, at least in the region in which the first tubular element is arranged. The term "regionally" can refer in particular to the section of the tubular elements that are arranged one within the other.Preferably, the third tubular element can be spaced apart from the second tubular element in the transverse direction, in particular can be spaced substantially evenly in all directions running transversely to the longitudinal direction. The third tubular element can preferably have an at least central extension in the transverse direction which is in a ratio of 0.1 to 1.5, preferably 0.4 to 1.0, to an extension of the third tubular element in the longitudinal direction. The outlet end of the third tubular element can be designed to be flush with the first tubular element. This can enable a particularly compact design. With an outlet end that is flush with the first end, the third tubular element can particularly preferably have an extension in the transverse direction which is in a ratio of 0.6 to 1.0, very particularly preferably 0.7 to 0.9, to an extension of the third tubular element in the longitudinal direction.Alternatively, the outlet end can be arranged outside the first tubular element and at a distance from the first tubular element. In other words, the third tubular element can extend beyond the first end beyond the first tubular element. Advantageously, the third tubular element can be designed and / or suitable, for example, for connecting a continuing fluid line, for example a corrugated bellows. If the outer end is arranged outside the first tubular element, the third tubular element can particularly preferably have an extension in the transverse direction which is in a ratio of 0.4 to 0.9, very particularly preferably 0.5 to 0.6, to an extension of the third tubular element in the longitudinal direction. The third tubular element can be formed integrally with the first tubular element and / or connected to the first tubular element in such a way that separation is not reversible or non-destructive.For example, the third pipe element can be welded to the side edges of the bottom opening of the base plate. It can preferably be provided that the third pipe element is not in direct contact with the second pipe element. In particular, it can be provided that the third pipe element is only in direct contact with the base plate, but not with any other element of the siphon. The first pipe element, the second pipe element and / or the third pipe element can have or can have a rounded, in particular circular, cross-section, at least in sections. The cross-section of the third pipe element can be designed to taper in the longitudinal direction towards the first end. A tapered design can, for example, enable an improved flow. Therefore, the high flow through the siphon can be achieved even at a low water pressure.Additionally or alternatively, the cross-section of the second and / or third tubular element may be substantially constant in the longitudinal direction.

[0013] The base plate of the first tubular element can have a base opening through which the third tubular element extends in a fluid-tight manner. Fluid-tight can mean that an edge of the base opening adjoins an outer wall of the third tubular element in a fluid-tight manner or is in direct contact with this. In other words, the base opening and the third tubular element can be designed and arranged such that a fluid cannot pass between the edge of the base opening and the outer wall of the third tubular element. A fluid within the meaning of this invention can be, for example, water and / or a water-laundry treatment agent mixture. Additionally or alternatively, a fluid can be, for example, water vapor and / or condensed water, which can arise, for example, in a treatment chamber of the laundry care appliance.Preferably, the base plate has no further openings other than the base opening and / or completely closes the cross-sectional area of ​​the first end except for the base opening, in particular in a fluid-tight manner. Thus, the first tube element can have a cup-like structure. In particular, a fluid path through the first end of the first tube element can be enabled exclusively by the third tube element, in particular from the inlet end to the outlet end. The first tube element and the third tube element can be formed integrally with one another. Thus, production of the siphon can be efficient due to the fewer individual parts.

[0014] The cover plate can be arranged between the siphon end and the outer end and seal the second pipe element, in particular in a longitudinal direction. This can preferably mean that the cover plate, at its position in the second pipe element, covers or closes off the entire cross-section of the second pipe element in a fluid-tight manner, in particular such that a fluid cannot pass through the second pipe element from the siphon end to the outlet end. The cover plate can preferably be flat and in particular aligned parallel to the cross-sectional area of ​​the siphon end and / or the inlet end of the first pipe element. The cover plate is arranged in particular between the first end of the first pipe element and the second end of the first pipe element.

[0015] The fluid inlet opening can lead into a region between the first pipe element and the second pipe element. In other words, the fluid inlet opening is arranged in particular such that a fluid admitted through it into the siphon initially reaches the region between the first pipe element and the second pipe element. The fluid inlet opening can be round, in particular circular and / or elliptical. The fluid inlet opening can be designed to be connectable to a fluid supply line, e.g., a household water supply. A supply pipe section can be connected in a fluid-tight manner to the fluid inlet opening, in particular to an outer side of the siphon. The supply pipe section can, for example, be curved. The normal of the cross-sectional area of ​​an inlet opening of the supply pipe section can be substantially transverse (e.g.,orthogonally). Advantageously, a curved supply pipe section can enable a space-saving connection of a fluid supply line to the siphon. The fluid inlet opening can be arranged in the region of the second end. In particular, viewed in the longitudinal direction, the fluid inlet opening can be arranged in a region whose distance from the second end is in a ratio of 0 to 0.5, preferably 0 to 0.3, particularly preferably 0 to 0.2, to its distance from the first end. This reliably prevents gases from passing through the siphon. The fluid inlet opening can preferably be arranged closer to the second end, viewed in the longitudinal direction, than the inlet end of the third pipe element and / or than the cover plate. Advantageously, a cross-section of the fluid inlet opening can be aligned substantially parallel to an opening cross-section of the second end. The fluid inlet opening can be arranged on the retaining tab.In particular, the retaining tab can have an opening that corresponds to the fluid inlet opening and / or through which the fluid inlet opening leads. Preferably, the fluid inlet opening can be arranged on a surface of the retaining tab whose normal is aligned substantially parallel to the longitudinal direction.

[0016] The base plate, the first pipe element, the second pipe element, the third pipe element and the cover plate can form a functional siphon section which can prevent the passage of steam or condensed liquid from the outlet end to the second end. A preferred function of the siphon in its operating position is explained below. The base plate can represent a lower part of the siphon section in which fluid can collect when fluid is supplied, and the cover plate represents an upper part of the siphon section beneath which steam or gases can potentially collect. A liquid which enters the siphon through the fluid inlet opening can first be guided downwards between the first pipe element and the second pipe element to the base plate.Due to the fluid pressure, the fluid can rise between the second pipe element and the third pipe element until it reaches the inlet end of the third pipe element. From there, the fluid can then flow through the third pipe element to the outlet end, from where it can be further conveyed, e.g., via a filling hose, particularly into a treatment chamber of the laundry care appliance.

[0017] The overflow opening is preferably designed to serve as overflow and / or backflow protection. This can be made possible in particular by the overflow opening being arranged between the siphon end and the fluid inlet opening, viewed in the longitudinal direction. The overflow opening is preferably spaced apart from the fluid inlet opening, viewed in the longitudinal direction. A distance of the overflow opening in the longitudinal direction from the fluid inlet opening and / or to the first end (starting in particular from the nearest edge of the overflow opening) can preferably be in a ratio of 0.1 to 0.3 to a distance of the first end from the second end. Advantageously, for example, if a negative pressure arises in a water line leading to the fluid inlet opening, this negative pressure can be compensated for by the overflow opening, such that suction of fluid or liquid from the third pipe element can be prevented.On the other hand, if, for example, a fluid enters the siphon through the outlet end, for example due to a blocked drain line of the laundry care appliance, the overflow opening can prevent the fluid from reaching the fluid inlet opening and thus the water supply. In other words, if the fluid level within the siphon rises, the overflow opening can prevent the fluid from reaching the fluid inlet opening because the fluid first escapes through the overflow opening. While prior art laundry care appliances preferably provide the air gap through a region above the dispenser tray, according to the invention, an air gap can be provided through the overflow opening.This can be more space-saving than with prior art devices, and it also eliminates the need for a dispenser tray, which can be advantageous, for example, in automatic dosing systems as part of further automation. Preferably, the overflow opening can be connected to the fluid inlet opening. This reliably prevents fluid from being sucked from the siphon into the fluid inlet opening.

[0018] Additionally or alternatively, the overflow opening can be arranged between the siphon end and the second end of the first pipe element. This can prevent a fluid, for example water or a water mixture, from escaping from the siphon through the overflow opening during the supply through the fluid inlet opening, if there is no overflow or backflow in the laundry care appliance. In the context of this invention, a water mixture can be understood as a mixture of water and at least one further substance. In particular, the at least one further substance can comprise a detergent and / or dirt particles. The overflow opening can be arranged in the transverse direction substantially opposite the fluid inlet opening. Advantageously, this can prevent fluid or water from escaping, for example due to fluid turbulence.Splashing of liquid can be prevented, in particular, by ensuring that there is no direct, straight connection between the two openings. Preferably, the overflow opening can be arranged in a side wall of the first tubular element, or the first tubular element can include the overflow opening in a side wall. The side wall of the first tubular element can, in particular, be an outer shell whose normal runs at least locally parallel to the transverse direction and / or perpendicular to the longitudinal direction.

[0019] According to one embodiment, the first tubular element, the second tubular element, and / or the third tubular element can be at least partially cylindrical. "At least partially" can mean that the first tubular element, the second tubular element, and / or the third tubular element can be cylindrical, at least in sections, particularly in the region of their longitudinal intersection. The "region of their intersection" is understood to mean, in particular, the section with which the second tubular element is arranged in the first tubular element and / or with which the third tubular element is arranged in the second tubular element and the first tubular element. Preferably, the central axis of at least one cylindrical section of the first tubular element, the second tubular element, and / or the third tubular element can be oriented substantially parallel to the longitudinal axis.The first tubular element, the second tubular element and / or the third tubular element can have, at least in sections, a round, in particular circular, cross-section, wherein the cross-section can be substantially constant, in particular in the longitudinal direction. Preferably, the diameter of the first tubular element can be larger than the diameter of the second tubular element. The diameter of the second tubular element can preferably be larger than the diameter of the third tubular element. The fluid inlet opening can be offset by substantially 180° compared to the overflow opening, viewed in the longitudinal direction. In other words, the fluid inlet opening can be arranged on the opposite side of the circle defined by the circular intersection surfaces of the cylinder, in particular of the first tubular element, with respect to the overflow opening.Advantageously, a cylindrical design of the tube elements enables an enlarged cross-section of the siphon area, which is formed by the tube elements overlapping in the longitudinal direction. The circular cross-section of the siphon thus formed can reduce flow resistance compared to the prior art. Furthermore, the siphon can be more compact than prior art models. Furthermore, at least one of the tube elements can be designed to be rotationally symmetrical about the longitudinal direction. This ensures a uniform flow of fluid through the siphon and reduces flow resistance.

[0020] According to a further embodiment, the inner diameter of the third tubular element can have a ratio of 0.2 to 0.95, preferably 0.5 to 0.85, particularly preferably 0.6 to 0.8, to the inner diameter of the second tubular element. The specified ratios can preferably be determined based on the average inner diameters of the tubular elements, particularly in the case of variable inner diameters within a tubular element. The ratios of the inner diameters can, in particular, influence and / or define the cross-sectional dimensions of the fluid path through the siphon. The specified ratios of the inner diameters can be advantageous in that they can enable a fluid flow that effectively facilitates the supply of liquid for the operation of the laundry care appliance, while at the same time taking into account the most space-saving design possible.A ratio of 0.5 to 0.85 can be particularly effective in preventing the siphon from clogging. A ratio of 0.6 to 0.8 can combine a favorable flow cross-section and good pressure equalization between the fluid inlet and overflow openings with a moderate amount of fluid collecting in the siphon.

[0021] According to a further embodiment, the first pipe element can be arranged concentrically to the second pipe element and / or to the third pipe element. A circumferential, in particular circular, siphon can be formed by the three pipe elements. A concentric arrangement can enable particularly uniform use of the spaces between the pipe elements, whereby flow resistance can be effectively reduced. Furthermore, a concentric arrangement can ensure that in the event of a backflow of liquid, a flow path to the overflow opening and to the fluid inlet opening is equally well guaranteed, without, on the one hand, unnecessarily high flow resistance being generated for the liquid flowing in through the fluid inlet opening and, on the other hand, without, if necessary, potentially severely impeding outflow through the overflow opening.Additionally or alternatively, the cross-sectional areas of the first pipe element, the second pipe element, and the third pipe element can be arranged parallel to one another. This can further improve uniform flow characteristics. Furthermore, the round shape of the siphon also allows the overflow edges, around which the fluid is deflected upon passing through the siphon, to be longer than in known U-shaped or V-shaped siphons from the prior art. This allows for a compact siphon with increased fluid permeability.

[0022] According to a further embodiment, the siphon can comprise a cover ring, wherein the cover ring can cover the area between the first pipe element and the second pipe element in a fluid-tight manner at the second end of the first pipe element, wherein the cover ring can in particular encompass the fluid inlet opening. Advantageously, the second end and the outer end can be arranged in substantially the same position when viewed in the longitudinal direction. Together with the cover plate, the outer ring can completely cover the siphon in the direction of the second end, optionally with the exception of the fluid inlet opening, or completely cover the siphon upwards in the installed state, so that from the second end or from above, in particular only something can penetrate into the siphon through the fluid inlet opening. The cover ring can provide additional protection against vapor or gas escaping from the siphon.In addition, the cover ring can provide protection against the penetration of foreign objects into the siphon. The cover ring can be part of the retaining tab described above. Furthermore, the cover ring can be formed integrally with the first pipe element to minimize the number of separate parts of the siphon.

[0023] According to a further embodiment, the second pipe element can comprise a ventilation opening arranged longitudinally between the inlet end and the cover plate. The ventilation opening can preferably be dimensioned such that the escape of steam through the ventilation opening is substantially prevented, at least as long as no excess pressure prevails. The length of the ventilation opening in the longitudinal direction can be in a ratio of 0.01 to 0.10, preferably 0.05 to 0.08, to the length of the second pipe element from the cover plate to the siphon end. Advantageously, this can still substantially prevent the escape of steam from the area between the second pipe element and the first pipe element, while at the same time counteracting an excessive buildup of pressure in this area. The ventilation opening can be arranged on a side of the second pipe element facing away from the overflow opening.The ventilation opening can be arranged longitudinally directly adjacent to the cover plate. The ventilation opening can comprise a closing mechanism for closing the ventilation opening. The closing mechanism can be configured to be automatically closable by means of a control mechanism and / or comprise the control mechanism. A closable ventilation opening can be advantageous, for example, to prevent ozone from escaping from the ventilation opening during ozone treatment of laundry by closing the ventilation opening. The ventilation opening can be implemented as a check valve. This allows for a particularly simple design.

[0024] According to a further embodiment, the second pipe element and the first pipe element can be designed as separate components. Advantageously, a separate design can facilitate production on the one hand and maintenance of the siphon on the other. For example, the first pipe element and the second pipe element can be realized as injection-molded parts, which enables efficient production of the siphon. To connect the first pipe element to the second pipe element, the second pipe element can have a retaining tab and / or the first pipe element can have a projection. The second pipe element and / or the first pipe element can have at least one fixing element, for example a locking lug and / or a recess, which is designed to establish a rotational orientation of the first pipe element relative to the second pipe element about a rotational axis parallel to the longitudinal axis.Advantageously, a fixed rotational position of the two tube elements relative to each other can be established when assembled. The third tube element and the first tube element can be an integral component. Thus, the siphon can be composed of only two separate components, which keeps assembly of the siphon simple while still allowing parallel siphon structures to be manufactured using the injection molding process.

[0025] According to a further embodiment, the opening cross-section of the fluid inlet opening can be smaller than the opening cross-section of the overflow opening, wherein the areas of the opening cross-sections are in particular in a ratio of 0.2 to 0.8, preferably 0.4 to 0.6, particularly preferably 0.45 to 0.55. This advantageously ensures that the penetration of fluid or liquid, in particular contaminated water, into the fluid inlet opening through the overflow opening is reliably prevented. The given conditions have proven to be particularly effective in enabling a sufficient exit path for backflowing liquid. A ratio of 0.4 to 0.6 is also particularly favorable for compensating for negative pressure in the inflow line.A ratio of 0.45 to 0.55 can further optimize these two properties and also be small enough to prevent particles and dirt from entering the siphon from the outside. Advantageously, the overflow opening can be designed to allow a flow rate of at least 11 l / min, preferably at least 16 l / min. This allows the siphon to be used even at high flow rates.

[0026] According to a further embodiment, the ratio of the extension of the overflow opening to the distance between the first end and the second end, viewed in the longitudinal direction, can be from 0.05 to 0.5, preferably from 0.1 to 0.3, particularly preferably from 0.15 to 0.25. Such a ratio can be particularly advantageous with regard to the functionality of the overflow opening, in particular with regard to the purpose of preventing backflow via the fluid inlet opening into a supply line. At a ratio of from 0.1 to 0.3, in particular from 0.15 to 0.25, this functionality is further improved. A ratio in the range from 0.1 to 0.3 can also enable particularly efficient spatial division of the components of the siphon, for example by allowing the extension of the third pipe element within the first pipe element to be selected particularly well.A ratio of 0.15 to 0.25 can also allow a particularly good adaptation to favorable sizes of the cross-sections of the fluid inlet opening and / or the inlet end of the third pipe element.

[0027] According to a further aspect of the present invention, a laundry care appliance comprising a siphon according to the invention as described herein is provided. The features and advantages described for the siphon apply analogously to the laundry care appliance and vice versa. The laundry care appliance can preferably comprise a treatment chamber for treating laundry. The treatment chamber can in particular comprise a laundry drum. The siphon can preferably be fluidically connected to the treatment chamber. The laundry care appliance can comprise a fluid line, wherein the fluid line fluidically connects the siphon to the treatment chamber. The fluid line can in particular be connected to the outlet end of the third tubular element. Preferably, the siphon is arranged in the laundry care appliance such that the fluid line to the treatment chamber runs beyond the outlet end of the tubular element, viewed in the longitudinal direction.The laundry care appliance can comprise a sealing sleeve and a door designed to close and open an access opening to the treatment chamber in a fluid-tight manner. The sealing sleeve can comprise an access path to the treatment chamber, wherein in particular the fluid line can be connected to the treatment chamber via the access path of the sealing sleeve. The access path can preferably be arranged in an upper half of the treatment chamber when properly installed. The access path of the sealing sleeve can preferably be arranged below the siphon and / or longitudinally beyond the outlet end of the third pipe element when properly installed. Additionally or alternatively, the siphon can be arranged in an edge region of the laundry care appliance when viewed in the transverse direction.An edge area can, in particular, be the area extending transversely from one end of the laundry care appliance up to a maximum of 25% of the laundry care appliance's length. When the laundry care appliance is properly installed, the siphon can be located at the top left front when viewed from the front of the laundry care appliance or the door to the laundry care appliance's treatment chamber. The laundry care appliance can comprise an automatic detergent dosing system and / or a detergent storage container, whereby it can, in particular, be provided that the laundry care appliance does not comprise a detergent drawer.

[0028] The invention is also directed to the use of a siphon according to the invention, as described herein, for a laundry care appliance. The features and advantages described for the siphon and the laundry care appliance apply analogously to the use, and vice versa. For example, the siphon can be arranged in a location where a detergent drawer is usually provided or directly beneath a detergent drawer.

[0029] Further advantages and features will become apparent from the following description of preferred embodiments of the subject matter of the invention with reference to the accompanying figures. The following description serves only to clarify the invention and should not be construed as limiting the appended claims to one of the embodiments. Individual features of the individual embodiments can be combined with one another within the scope of the invention. They show Fig. 1 a perspective view of a siphon according to a first embodiment of the invention, Fig. 2 a perspective view of a sectional view of a siphon according to the first embodiment of the invention, Fig. 3 a perspective view of a second pipe element according to a second embodiment of the invention, Fig. 4a perspective view of a first pipe element together with a third pipe element according to the second embodiment of the invention, Fig. 5 a side view of a second pipe element according to a third embodiment of the invention, Fig. 6 a side view of a first pipe element together with a third pipe element according to the third embodiment of the invention, Fig. 7 a perspective view of a siphon together with a fluid line according to a further embodiment of the invention and Fig. 8 a perspective view of a laundry care appliance according to a further embodiment of the invention in which side walls are shown transparent.

[0030] In Figure 1 is a perspective view of a siphon 1 according to a first embodiment of the invention. For a better insight into the interior, Figure 2a perspective view of a sectional view of the siphon 1 according to the first embodiment of the invention. The siphon comprises an outer first pipe element 10, a second pipe element 20 arranged therein, and a third pipe element 30 arranged partially or sectionally in the second pipe element 20 and the first pipe element 10. The pipe elements 10, 20, 30 are cylindrical, arranged essentially concentrically, and oriented such that their common center axis extends parallel to a longitudinal direction L. The second pipe element 20 is seated on the first pipe element 10 by means of a circumferential retaining tab 28 and is additionally secured by a circumferential projection 14 of the first pipe element 10. The first pipe element 10 and the second pipe element 20 can be firmly connected to one another or, alternatively, can be designed as separate components.The siphon 1 comprises a cover ring 8, which covers the area between the first pipe element 10 and the second pipe element 20 at the second end 12 of the first pipe element or the outer end 24 of the second pipe element 20 and which is part of the retaining tab 28. The cover ring 8 comprises a fluid inlet opening 4 (not visible here), to which a supply pipe section 5 is connected. A liquid, in particular water, can be supplied to the siphon 1 via the supply pipe section 5 and the fluid inlet opening 4. The liquid is guided downward in the area between the first pipe section 10 and the second pipe section approximately parallel to the longitudinal direction L or following gravity until it encounters a base plate 18. The third pipe element 30 extends through a bottom opening of the base plate 18 in a fluid-tight manner.The liquid collects on the base plate 18 and rises due to the pressure of oncoming liquid in the area between the second pipe element 20 and the third pipe element 30, which begins at the siphon end 21 of the second pipe element 20. The line path available for the water line in the siphon 1 has a circular cross-section both between the first pipe element 10 and the second pipe element 20 and between the second pipe element 20 and the third pipe element 30. This makes it possible to achieve a particularly efficient water line by combining a large cross-section with low flow resistance and, accordingly, only a small space requirement. As soon as the level of the liquid between the second pipe element 20 and the third pipe element 30 has risen sufficiently that the inlet end 31 of the third pipe element 30 is reached oris exceeded, the liquid can flow into the interior of the third pipe element 30 and be passed on through this via the outlet end 32, for example to a subsequent fluid line 7 and / or a treatment chamber 3 of a laundry care appliance 2. A cover plate 24 and the side walls of the second pipe element 20 form an area in which warm / hot vapors or gases coming from the third pipe element can collect. These are advantageously prevented from rising further by the cover plate 24. Since the fluid path formed between the second pipe element 20 and the third pipe element 30 leads downwards and / or since liquid coming from the fluid inlet opening has collected in this area, these vapors or gases are retained in this area. The siphon 1 can thus fulfill the general function of a siphon according to the prior art, wherein it can have the advantages mentioned.The siphon 1 additionally has an overflow opening 6 in the side wall 16 of the first pipe element 10. The overflow opening 6 is arranged, as viewed in the longitudinal direction L, between the inlet end 31 of the third pipe element 30 and the fluid inlet opening 4 or the supply pipe section 5. It serves the purpose of ensuring that in the event of backflow, e.g. due to a blocked sewer line, when liquid rises in the siphon, this first reaches the overflow opening 6 before the fluid inlet opening 4 can be reached. Furthermore, in the event of a negative pressure in the supply pipe section 5 or in a water supply line of the laundry care appliance 2, in particular in the groundwater supply of a building and / or household, liquid, in particular dirty water, is prevented from being sucked via the third pipe element 30 into the supply pipe section 6 and via it into the water supply line or the groundwater supply.The negative pressure can be compensated for by the overflow opening 6. This advantageously prevents, in particular, contamination of the groundwater supply. The opening cross-section of the fluid inlet opening 4 is smaller than the opening cross-section of the overflow opening 6, and the fluid inlet opening 4 is arranged transversely opposite the overflow opening 6.

[0031] The Figure 3 shows a perspective view of a second pipe element 20 according to a second embodiment of the invention and the Figure 4shows a perspective view of an associated first pipe element 10 together with a third pipe element 30 according to the second embodiment of the invention. The second pipe element 20 and the first pipe element 10 are designed here as separate components, which can be connected to one another by means of the circumferential retaining tab 28 of the second pipe element 20 and the circumferential projection 14 of the first pipe element 10. A separate design of these two pipe elements 10, 20 can enable simplified production and / or simplified maintenance of the siphon 1. The first pipe element 10 can be formed integrally with the third pipe element 30 and / or, for example, welded to the third pipe element 30. The siphon 1 shown here can otherwise be designed analogously to the Figures 1 and 2 shown embodiments.

[0032] The Figure 5shows a side view of a second pipe element 20 according to a third embodiment of the invention and the Figure 6shows a side view of a first pipe element 10 together with a third pipe element 30 according to the third embodiment of the invention. In this embodiment, too, the first pipe element 10 and the second pipe element 20 are designed separately. The second pipe element 20 also has a ventilation opening 26, which is arranged directly below the cover plate 24 or, in the longitudinal direction L, directly adjacent to the cover plate 24. The ventilation opening 26 can serve to counteract a build-up of excess pressure in the area below the cover plate 24. The ventilation opening 26 is relatively small in size or has a small cross-sectional opening, so that the escape of larger quantities of steam can be prevented, at least when there is no excess pressure. The third embodiment shown can, with regard to its further features, be comparable to that shown in the Figures 1 and 2 shown first embodiment and / or the Figures 3 and 4correspond to the second embodiment shown.

[0033] The Figure 7 shows a perspective view of a siphon 1 together with a fluid line 7 according to a further embodiment of the invention. The siphon 1 can be constructed according to one of the Figures 1 to 6 The fluid line 7 is connected to the third pipe element 30 and is designed to conduct a liquid, in particular water or a water mixture, from the siphon 1 to a treatment chamber 3 of a laundry care appliance 2.

[0034] The Figure 8shows a perspective view of a laundry care appliance 2 according to a further embodiment of the invention, in which side walls and other components are shown as transparent for a better view of the interior. The laundry care appliance 2 comprises a siphon 1 according to the invention, which is arranged in a front upper left corner of the laundry care appliance 2. The siphon 1 is fluidically connected to the treatment chamber 3 via a fluid line 7 and a sealing sleeve of a door of the treatment chamber 3 of the laundry care appliance 2. List of reference symbols:

[0035] 1Siphon 2Laundry care device 3Treatment chamber 4Fluid inlet opening 5Supply pipe section 6Overflow opening 7Fluid line 8Cover ring 10First pipe element 11First end 12Second end 14Protrusion 16Side wall of the first pipe element 18Bottom plate 20Second pipe element 21Siphon end 22Outer end 24Cover plate 26Ventilation opening 28Retaining tab 30Third pipe element 31Inlet end 32Outlet end LLongitudinal direction

Claims

1. Siphon (1), provided for arrangement in a laundry care appliance (2), comprising - a first tube element (10) comprising a first end (11) and a second end (12) in a longitudinal direction (L), - a second tube element (20), which is and / or can be arranged in the first tube element (10), at least in sections, with a siphon end (21) that faces towards the first end (11) and is spaced apart therefrom and an outer end (22) that lies opposite the siphon end (21), - a lid plate (24), which is arranged in the second tube element (20) between the siphon end (21) and the outer end (22) and seals off the second tube element (20), - a third tube element (30), which is arranged in the first tube element (10), at least in sections, and in the second tube element (20), at least in sections, with an input end (31) that faces towards the second end (12) and the lid plate (24) and is spaced apart from the lid plate (24) and an output end (32) that lies opposite the input end (31), and - a fluid inlet opening (4) which leads into a region between the first tube element (10) and the second tube element (20) as well as an overflow opening (6) which leads out of said region, - wherein the first tube element (10) comprises a base plate (18) with a base opening at its first end (11), - wherein the third tube element (30) extends through the base opening in a fluid-tight manner, characterised in that - the overflow opening (6) is arranged between the input end (31) of the third tube element (30) and the fluid inlet opening (4), when viewed in the longitudinal direction (L).

2. Siphon (1) according to claim 1, - wherein the first tube element, the second tube element (20) and / or the third tube element (30) are embodied as at least partially cylindrical.

3. Siphon (1) according to one of the preceding claims, - wherein the inner diameter of the third tube element has a ratio of 0.2 to 0.95, preferably 0.5 to 0.85, particularly 0.6 to 0.8, in relation to the internal diameter of the second tube element, as does the internal diameter of the second tube element in relation to the internal diameter of the first tube element.

4. Siphon (1) according to one of the preceding claims, - wherein the first tube element (10) is arranged concentrically in relation to the second tube element (20) and / or the third tube element (30).

5. Siphon (1) according to one of the preceding claims, comprising a cover ring (8), - wherein the cover ring (8) covers the region between the first tube element (10) and the second tube element (20) in a fluid-tight manner at the second end (12) of the first tube element, - wherein the cover ring (8) in particular comprises the fluid inlet opening (4).

6. Siphon (1) according to one of the preceding claims, - wherein the second tube element (20) comprises a ventilation opening (26) that is arranged between the input end (31) and the lid plate (24) in the longitudinal direction (L).

7. Siphon (1) according to one of the preceding claims, - wherein the second tube element (20) and the first tube element (10) are embodied as separate components.

8. Siphon (1) according to one of the preceding claims, - wherein the opening cross-section of the fluid inlet opening (4) is less than the opening cross-section of the overflow opening (6), - wherein the areas of the opening cross-sections in particular have a ratio of 0.2 to 0.8, preferably 0.4 to 0.6, particularly preferably 0.45 to 0.55.

9. Siphon (1) according to one of the preceding claims, - wherein an extension of the overflow opening (6) has a ratio of 0.005 to 0.5, preferably 0.1 to 0.3, particularly preferably 0.15 to 0.25, in relation to a spacing between the first end (11) and the second end (12), when viewed in the longitudinal direction (L).

10. Laundry care appliance (2) comprising a siphon (1) according to one of the preceding claims.