Jet regulator for a dual-stream tap

Abstract

A jet regulator (1) for a dual-stream tap (2), the jet regulator (1) comprising: a first channel (3) for a first liquid stream and a second channel (4) for a second liquid stream, wherein the second channel (4) comprises a flow-through structure (5) for passage of said second liquid stream, said flow-through structure (5) having a concave bottom surface (50).

Description

Technical field of the invention

[0001] The present invention relates to the field of jet regulators for dual-stream taps.Background of the invention

[0002] Taps for dispensing liquids are an essential component of modern kitchens and households, providing a convenient source of water or other drinks, such as soft drinks, tea and coffee. One of the primary challenges in the field of taps is ensuring the delivery of high-quality water or other drinks while maintaining a user-friendly and aesthetically pleasing design. Consumers expect their taps to provide water or drinks that are free from contaminants, unwanted odors, and unpleasant tastes.

[0003] Dual-stream taps meet a need for versatility in the types of water delivered by the tap. For example, for some applications, consumers may prefer filtered, heated or chilled water, while for other applications, municipal water may be desired. Dual-stream taps typically provide multiple types of water, independently from each other, from the same tap. However, the design of the dual-stream tap end, or the point where the water is dispensed, plays a crucial role. The tap end should be optimized to minimize splashing and ensure a controlled flow of water, not only to enhance the convenience of use but also provide enhanced hygiene by reducing the potential for water spillage and contamination.

[0004] Furthermore, lime buildup is a problem with taps, as it may block the passage of liquid through the taps. In the state of the art, aerators exist having a flexible end surface. The flexible end surface allows the clogged liquid passage to be manually reopened by rubbing over this pattern. However, physical contact is possible in this process. This contact can lead to additional contamination or bacterial growth at the dispensing point.

[0005] Despite the advancements made in the field of taps, there is still room for improvement. Consumers continue to seek taps that offer reduced risk of clogging and improved quality of the dispensed liquid, such as reduced contamination. Thus, there is a need in the art for innovative designs that can effectively solve any of the above problems.Summary of the invention

[0006] It is an object of embodiments of the present invention to provide a good jet regulator for a dual-stream tap.

[0007] This objective is accomplished by a jet regulator for a dual-stream tap, and a dual-stream tap comprising the jet regulator, according to the invention.

[0008] In the first aspect, the present invention relates to a jet regulator for a dual-stream tap. The jet regulator comprises: a. a first channel for a first liquid stream, and b. a second channel for a second liquid stream. The second channel comprises a flow-through structure for passage of said second liquid stream, said flow-through structure having a hollow, or concave, bottom surface.

[0009] The inventors have observed that liquid (e.g., water) remains - after terminating the second liquid stream through the second channel - at the hollow or concave bottom surface of the second channel, so that the liquid surface is located below the bottom surface of the flow-through structure. Without being bound by theory, this appears to be a result of the improved interfacial area between said liquid and the bottom surface, due to the latter being hollow. The liquid then sticks to the hollow surface as a result of surface tension, and does not retract.

[0010] Thus, said liquid is effectively retained at the bottom surface of the flow-through structure, providing a liquid or water pocket at the bottom surface, and does not retract to components such as meshes or filters upstream of the flow-through structure. Therefore, lime scale buildup at the flow-through structure may be prevented, as lime may remain dissolved in the liquid or water pocket, or move sideways away from the bottom surface, preventing clogging of the flow-through structure by lime scale buildup. Furthermore, passage of air may be prevented so that any components within the second channel, upstream of the hollow bottom surface, remain wetted by the second liquid after terminating liquid flow. As such, the hollow bottom surface may reduce the buildup of lime scale on said upstream components, such as meshes or filters, effectively preventing clogging.

[0011] The bottom surface being hollow may mean that the bottom surface is concave or curved inward. In embodiments, a cross-section of the hollow bottom surface, in a plane perpendicular to a surface normal, may form a segment of a circle. For example, a radius of curvature of the bottom surface, e.g., of the segment of the circle, may be from 0.1 cm to 10 cm, for example from 0.2 cm to 5 cm. Said radius of curvature may depend on physical space and strength of the material, e.g., ribs, containing or defining the hollow bottom surface. Alternatively, a cross-section of the hollow bottom surface, in a plane perpendicular to a surface normal, may have a V shape or a U shape.

[0012] In embodiments, the first channel may be an inner channel, and the second channel may be an outer channel enclosing said inner channel. In embodiments, the inner channel may be substantially coaxial with the outer channel. In embodiments, the flow-through structure may encircle the inner channel. In embodiments, said flow-through structure may comprise substantially radially oriented ribs. The ribs may help keep the flow stable and laminar. Furthermore, spaces between adjacent ribs may be formed relatively broadly to prevent clogging. In embodiments, the ribs may be substantially conformal, so have a substantially conformal shape. In embodiments, the ribs may be substantially equidistant about the inner channel. This may provide even and uniform flow distribution of the second liquid stream.

[0013] In embodiments, the first channel may project downward with respect to said hollow bottom surface. In embodiments, a distance between a lower end of the first channel and a lower end of the bottom surface of the second channel is at least 1 mm or at least 5 mm or at least 1 cm, such as from 1 mm to 10 cm, from 5 mm to 10 cm or from 1 cm to 10 cm. It is an advantage of these embodiment that the first and second liquid stream may remain effectively separated, and cross-contamination between the first channel and the second channel may be effectively eliminated. Indeed, the projection provides a barrier for liquid retaining at the hollow bottom surface of the flow-through structure from moving into the first channel. Furthermore, the inventors have observed that, when the first channel is an inner channel and the second channel is an outer channel enclosing said inner channel, and when a second liquid flows from the second, outer channel, an air bubble is formed at the end of the first, downwardly projecting channel. Said air bubble effectively prevents any second liquid from entering the first channel. As such, when the first channel projects downward with respect to the hollow surface, components (such as sieves) of the first channel do not come into contact with the second liquid stream.

[0014] In embodiments, the flow-through structure may be located at an outlet of the second channel. Preferably, components within the second channel are located upstream of the flow-through structure.

[0015] In embodiments, the jet regulator may comprise, in the second channel, at least one second filter for blocking small particles, upstream of the flow-through structure. The second filter may prevent said small particles from leaving the tap, which could result in contamination In embodiments, the jet regulator may comprise, in the second channel, one or more second meshes for rendering the second liquid stream into a laminar flow, upstream of the flow-through structure, and downstream of the at least one second filter, if present. This specific location prevents small particles from clogging the second meshes, while at the same time preventing lime sedimentation on the second meshes.

[0016] Although the second liquid stream may be provided as a laminar flow, the invention is not limited thereto. Instead, the second liquid stream may be provided as an aerated liquid stream. A typical technique to obtain an aerated jet is by providing openings through a side wall of a housing of an aerator. Through these openings, air is drawn in with the second liquid stream, creating an aerated stream. The aerated liquid stream may alternatively be provided by: mechanical aeration involving devices like impellers, rotors, or propeller aspirators; diffused aeration typically using diffusers, e.g., porous devices that release air bubbles into the liquid; or surface aeration, comprising propelling the liquid into the air, breaking it into small droplets that absorb oxygen from the air.

[0017] In embodiments, the jet regulator may comprise, in the second channel and upstream of the flow-through structure, a structure comprising tapered holes, the tapered holes narrowing downstream. The tapered holes provide further flow control and help prevent splashing.

[0018] In embodiments, the filters may comprise or be formed of stainless steel, such as RVS 316L. Alternatively, the filters may comprise or be formed of a plastic.

[0019] In embodiments, the bottom surface or the flow-through structure comprises, or is formed of, a metal, such as stainless steel, or a polymer material, such as polyphenylsulfone. It is an advantage of these embodiments that polyphenulsulfone is suitable for contact with food, has a wide thermal range that allows sterilization via steam, and has a low absorption when exposed to solvents. Preferably, the flow-through structure does not repel water, but may be hydrophilic, although this is not strictly required and depends on the shape of the hollow bottom surface. For example, polyphenylsulfone typically provides a contact angle with water of 137°, and is generally considered hydrophobic, but appears to provide the effect of the present invention, with water remaining at the hollow or concave bottom surface as well. For example, materials or plastics normally used in taps may be used for the bottom surface or the flow-through structure. In embodiments, the contact angle (as a measure of hydrophilicity) for water on a material of which the hollow bottom surface or the flow-through structure is formed is less than 150°, preferably less than 140°. In some embodiments, the contact angle may be less than 120°, such as less than 90° (with a contact angle of less than 90° commonly being indicated as hydrophilic).

[0020] In the second aspect, the present invention relates to a dual-stream tap, comprising the jet regulator according to any embodiments of the first aspect.

[0021] In embodiments, the jet regulator may be present at an outlet of the tap. In embodiments the jet regulator may be used in a dispenser apparatus, which may be for example be a tabletop or portable apparatus.

[0022] In embodiments, the dual-stream tap may further comprise: a. a first tube fluidically coupled to the first channel, and b. a second tube fluidically coupled to the second channel.

[0023] In embodiments, the first tube may be fluidically coupled to a first liquid source. In embodiments, the second tube may be fluidically coupled to a second liquid source. The first liquid source may be different from the second liquid source. A first liquid stream may be provided, by the first liquid source, to the first channel and a second liquid stream may be provided, by the second liquid source, to the second channel. The first liquid stream may be different from the second liquid stream. For example, the purity or temperature may be different. A different purity may be the result of different filtering. One of the liquids may be tap water, while another of liquids is mineral water. As another example, one of the liquids may be still water, while the other liquid may sparkling water. As still another example, one of the liquids may be water, while the other liquid contains a beverage such as coffee, tea or a soft drink. As another example, the first (e.g., inner) channel may dispense heat or cooled liquids, while the second channel dispenses tap water.

[0024] As the first and second liquid stream may be of another type, it is preferred that the first and second liquid stream remain separated from each other. This may be effectively achieved by the jet regulator in accordance with embodiments of the present invention, preventing cross-contamination between the first and second liquid streams.

[0025] Particular and preferred aspects of the invention are set out in the accompanying independent and dependent claims. Features from the dependent claims may be combined with features of the independent claims and with features of other dependent claims as appropriate and not merely as explicitly set out in the claims.

[0026] Although there has been constant improvement, change and evolution of devices in this field, the present concepts are believed to represent substantial new and novel improvements, including departures from prior practices, resulting in the provision of more efficient, stable and reliable devices of this nature.

[0027] The above and other characteristics, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. This description is given for the sake of example only, without limiting the scope of the invention. The reference figures quoted below refer to the attached drawings.Brief description of the drawings

[0028] Fig. 1A is a perspective view of a jet regulator according to embodiments of the present invention. Fig. 1B is an exploded view of the jet regulator of FIG. 1A. Fig. 1C is a vertical cross-section of the jet regulator of FIG. 1A wherein water sticks to the hollow bottom surface. Fig. 2A and 2B are cross-sectional views of a dual-stream tap comprising the jet regulator according to embodiments of the present invention, with the second liquid stream and first liquid stream being dispensed, respectively. Fig. 3 is an exploded view of a dual-stream tap comprising the jet regulator according to embodiments of the present invention.

[0029] In the different figures, the same reference signs refer to the same or analogous elements.Description of illustrative embodiments

[0030] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn on scale for illustrative purposes. The dimensions and the relative dimensions do not correspond to actual reductions to practice of the invention.

[0031] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0032] Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other orientations than described or illustrated herein.

[0033] It is to be noticed that the term "comprising", used in the claims, should not be interpreted as being restricted to the means listed thereafter; it does not exclude other elements or steps. It is thus to be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. The term "comprising" therefore covers the situation where only the stated features are present and the situation where these features and one or more other features are present. The word "comprising" according to the invention therefore also includes as one embodiment that no further components are present. Thus, the scope of the expression "a device comprising means A and B" should not be interpreted as being limited to devices consisting only of components A and B. It means that with respect to the present invention, the only relevant components of the device are A and B.

[0034] Similarly, it is to be noticed that the term "coupled", also used in the claims, should not be interpreted as being restricted to direct connections only. The terms "coupled" and "connected", along with their derivatives, may be used. It should be understood that these terms are not intended as synonyms for each other. Thus, the scope of the expression "a device A coupled to a device B" should not be limited to devices or systems wherein an output of device A is directly connected to an input of device B. It means that there exists a path between an output of A and an input of B which may be a path including other devices or means. "Coupled" may mean that two or more elements are either in direct physical or electrical contact, or that two or more elements are not in direct contact with each other but yet still co-operate or interact with each other.

[0035] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments.

[0036] Similarly it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

[0037] Furthermore, while some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention, and form different embodiments, as would be understood by those in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0038] Furthermore, some of the embodiments are described herein as a method or combination of elements of a method that can be implemented by a processor of a computer system or by other means of carrying out the function. Thus, a processor with the necessary instructions for carrying out such a method or element of a method forms a means for carrying out the method or element of a method. Furthermore, an element described herein of an apparatus embodiment is an example of a means for carrying out the function performed by the element for the purpose of carrying out the invention.

[0039] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0040] The invention will now be described by a detailed description of several embodiments of the invention. It is clear that other embodiments of the invention can be configured according to the knowledge of persons skilled in the art without departing from the technical teaching of the invention, the invention being limited only by the terms of the appended claims.Example 1: Jet-regulator

[0041] Reference is made to Fig. 1A and Fig. 1B that are perspective and exploded views, respectively, of an exemplary jet-regulator (1) for a dual-stream tap, in accordance with embodiments of the present invention. The jet regulator (1) comprises: a. a first channel for a first liquid stream (3), and b. a second channel for a second liquid stream (4), wherein the second channel (4) includes a flow-through structure (5) for the passage of the second liquid stream. The flow-through structure (5) contains a hollow bottom surface (50). The hollow bottom surface (50) efficiently prevents the retraction of the second liquid into the second channel (4).

[0042] In this example, the first channel (3) may be an inner channel, while the second channel (4) may be an outer channel that encloses the inner channel (3), providing a compact and efficient design. The flow-through structure (5) encircles the inner channel (3).

[0043] As illustrated in Fig. 1A and 1B, the jet regulator (1) features a cylindrical lower housing (91) with a smooth, continuous surface, that may be tapering slightly towards the bottom. At the center, the inner channel (3) is visible, characterized by a circular opening. Encircling the inner channel (3) is the second channel (4), which includes a flow-through structure (5) with a hollow or concave bottom surface (50). The bottom surface (50) is the downstream oriented surface. A surface normal on the bottom surface (50) is typically directed substantially in the flow direction of the second liquid stream, that is, in the downstream direction. The bottom surface (50) typically faces downstream, or in the flow direction of the second liquid stream or jet. Thus, the bottom surface (50) typically faces the second liquid stream or jet after it leaves the jet regulator (1). The bottom surface (50) is preferably located at an exit or outlet of the jet regulator (1).

[0044] In this example, the flow-through structure (5) features substantially radially oriented ribs (51) that are equidistantly spaced around the inner channel (3), contributing to a conformal, stable and laminar flow of the second liquid stream. The hollow bottom surface (50) is concave, ensuring that liquid, e.g., water, remains at the end of the outer channel (4) after usage. For example, when water starts flowing through the second, outer channel (4), the water fills up the hollow or cavity first before flowing out of the jet regulator (1). When the flow rate is high enough, the water jet centers itself while keeping a laminar flow. When the flow of water stops, the water sticks to the concave bottom surface (50) as a result of surface tension, as shown in Fig. 1C that is a vertical cross-section of the jet regulator (1) wherein liquid or water (55) sticks to the concave bottom surface (50). This prevents lime-scale deposition at components in the second channel (4) upstream of the concave bottom surface (50), as well as in the first channel (3) as the sticking liquid or water (55) cannot move into the first channel (3). The latter also prevents cross-contamination.

[0045] The bottom surface (50) being hollow or concave typically means that - along a laterally outward direction from the first channel (3) - said bottom surface (50) is hollow or concave. The bottom surface (50) being hollow or concave may mean that - along a laterally outward direction from the first channel (3) - said bottom surface (50) curves inwards or has a retracted central portion, e.g., first curves upwards and then curves downwards. The bottom surface (50) being hollow or concave may mean that - along a laterally outward direction from the first channel (3) - said bottom surface (50) forms a ∩ or Λ shape. As such, within the vertical cross-sectional view of FIG. 1C, on each of both opposing, lateral sides of the first channel (3), the bottom surface (50) is hollow or concave.

[0046] Referring back to Fig. 1A and 1B, the inner channel (3) and / or the outer channel (4) may comprise first meshes (32) and second meshes (42), respectively, separated from each other by first spacers (34) and second spacers (44), respectively. These meshes (32, 42) are typically designed or adapted to render the liquid stream into a laminar flow to ensure minimal splashing and smooth water delivery. In particular, the present example provides three of each of these meshes (32, 42), so that a good laminar flow is provided. Herein, the three first meshes (32) may be identical, and / or the three second meshes (42) may be identical.

[0047] The jet regulator (1) may also include, in the second channel (4), at least one second filter (41) for blocking small particles, positioned upstream of the flow-through structure (5) to protect it from clogging. The first channel (3) may contain at least one corresponding first filter (not shown). The one or more second meshes (42) are, in this example, positioned upstream of the flow-through structure (5), and downstream of the second filter (41) so that particles are blocked by the second filter (41) and cannot clog the second meshes (42).

[0048] In the present example, the first channel (3) comprises - upstream of the first meshes (32) and first spacers (34) - a jet splitter (31) for splitting the first liquid stream in individual smaller water jets by pushing the water through holes typically having a small diameter. In the present example, the holes are tapered in a downstream direction, so the diameter reduces along a downstream direction. This may ensure a stable flow of the first liquid stream after passage through the jet splitter (31). In the present example, the holes are evenly divided over the jet splitter (31), but this is not strictly required.

[0049] For a corresponding purpose with respect to the second liquid stream, in the present example, the second channel (4) comprises a jet splitter contained in a cylindrical upper housing (92). In other words, the upper housing (92) contains a structure (43) comprising tapered holes, the tapered holes (430) narrowing downstream. In the present example, the upper housing (92) comprises - for ease of assembly - a recess for receiving the second filter (41). The jet regulator (1) is thus arranged such that water first passes through the second filter (41) before passing through said tapered holes (430). This may prevent clogging of the tapered holes (430).

[0050] In the present example, the lower housing (91) and the upper housing (92) are adapted to fit together by, for example, a detachable click connection. In the present example, the second meshes (42) and second spacers (44) are stacked between the flow-through structure (5) of said lower housing (91) and the structure (43) comprising tapered holes of said upper housing (92). Herein, the second meshes (42) and second spacers (44) are laterally restricted by side walls defining the outer channel (4) of the jet regulator (1). In the present example, the side walls are integral with the lower housing (91). In the present example, the jet splitter (31) fits on the inside of the lower housing (91) with a detachable click connection. The first meshes (32) and first spacers (34) are stacked between a ridge projecting from the walls of the inner channel (3) contained in the lower housing (91), and the jet splitter (31).

[0051] In the present example, the jet splitter (31) contains a spacer (not shown), for providing a space between the holes of the jet splitter (31) and the first meshes (32) underneath. The spacer may, for example, comprise a central wall projecting from the center of the bottom surface of the jet-splitter, and an outer wall projecting at the periphery from the bottom surface of the jet-splitter. Said spacer may - for ease of assembly - be integral with the jet splitter (31).Example 2: Dual-stream tap

[0052] Fig. 2A is a vertical cross-sectional view of a dual-stream tap (2) in accordance with embodiments of the present invention, illustrating an arrangement of the jet regulator (1) in accordance with embodiments of the present invention at the outlet of the tap (2). In this example, the jet regulator (1) of the present example is the same as that of Example 1.

[0053] In this example, the first channel (3) is depicted as an inner channel, while the second channel (4) is the outer channel that encloses or encircles the inner channel (3). The first channel (3) and the second channel (4) are completely separated from each other by a wall, ensuring that the two streams do not mix. The flow-through structure (5) with a hollow bottom surface (50) is located at the outlet of the tap (2). With the bottom surface is meant the surface of the flow-through structure (5) directed downstream, or, in other words, the outlet-sided surface of the flow-through structure (5).

[0054] In embodiments of the present invention, the bottom surface (50) being hollow may mean that the surface is concave. Herein, the vertical cross-section of said bottom surface (50) (i.e., the cross-section normal or perpendicular to the bottom surface (50)) may form part of a circle, e.g., half of a circle, or part of an ellipsoid, but this is not required. Generally, as understood by the skilled person, the bottom surface (50) being hollow or concave may mean that said surface (50) curves inward or has a retracted central portion. This hollow shape ensures a large interfacial area between the liquid and the surface (50), so that surface forces may result in retention of the liquid at the surface (50).

[0055] The first channel (3), that is in this example an inner channel (3), projects downward - so in the flow direction or in the downstream direction - with respect to the hollow bottom surface (50) of the flow-through structure (5) in the outer channel (4). It has been observed by the inventors that, as a result of the projecting part of the first, inner channel (3), when a second liquid stream (55) (indicated by the dashed lines), e.g., water, flows through the second, outer channel (4), an air bubble (550) exists at the outlet (33) of the first channel (3). Said air bubble (550) effectively blocks the second liquid stream (55) from entering the first channel (3). As a result, contamination of the first, inner channel (3) by liquid from the second liquid stream (55) may be effectively averted.

[0056] In addition, as is shown in FIG. 2B, as the first channel (3) projects past a lower end of the hollow bottom surface (50) of the flow-through structure (5) in the outer channel (4), a first liquid stream leaving the inner channel (3) typically cannot contact any second liquid (55) sticking to or located at the hollow bottom surface (50). As such, the projecting inner channel (3) may effectively prevent cross-contamination - in both directions - between the first (3) and second channel (4).

[0057] Simultaneous reference is made to Fig. 3, showing an exploded view of the dual-stream tap (2) of the present example. The tap neck (8) features an inner thread at its lower end, designed to engage with the outer thread of a housing connector (26). The housing connector (26) is cylindrical and includes two O-rings (260) for sealing. In turn, a jet regulator housing (27) with the jet regulator (1) contained in its inner space, contains an inner thread for mounting on the housing connector (26) that contains a corresponding outer thread. The housing connector (26) thus allows for connecting the tap neck (8) to the jet regulator housing (27), with the jet regulator (1) housed in the latter.

[0058] Within the tap neck (8), an inner tube (7) carries a first liquid stream, that may, for example, be filtered water, cooled water (± 4°C), sparkling water, or hot water (max. 98 °C). The inner tube (7) terminates in an inner tube connector (28), which, in turn, engages with an inner jet connector (29) connected to the jet regulator (1). An inner tube filter may be provided in the inner tube connector (28) for preventing small particles from entering the jet regulator (1). The inner jet connector (29) has a star-shaped outer ring (290) that allows said first liquid stream to flow from the tap neck (8) to the jet regulator (1). The inner jet connector (29) can freely rotate and is held in place by the housing connector (26). A jet regulator gasket (270) ensures a waterproof connection between the housing connector (26) and the jet regulator (1).

[0059] The jet regulator (1) contains the upper housing (92) and lower housing (91) that fit together with a detachable click connection, and that were further described in Example 1. The jet regulator (1) is free to rotate within the jet regulator housing (27). As the jet regulator housing (27) is connected to the housing connecter (26), all inner components (e.g., filters and meshes contained in the jet regular (1)) are pushed into place. The jet regulator (1) contains an inner channel (3) that is fluidically coupled to the inner tube (7), in this example via the inner tube connector (28) and inner jet connector (29).

[0060] In this example, a second liquid stream, which may be tap water, is provided through the tap neck (8) that is thus serving as a second tube. The second liquid stream is fluidically separated from the first liquid stream that is contained in the inner tube (7) passing through the tap neck (8). The second tube (8) is fluidically connected to the outer channel (4) of the jet regulator (1). The second liquid stream passes along an outside of the inner tube connector (28) and inner jet connector (29) to enter the outer channel (4) of the jet regulator. The overall design of the jet regulator (1) ensures that the two types of water from the first, inner channel (3) and the second, outer channel (4) remain fully separated until they exit the jet regulator (1).

[0061] It is to be understood that although preferred embodiments, specific constructions and configurations, as well as materials, have been discussed herein for devices according to the present invention, various changes or modifications in form and detail may be made without departing from the scope of this invention. Steps may be added or deleted to methods described within the scope of the present invention.

Examples

example 1

Jet-regulator

[0041]Reference is made to Fig. 1A and Fig. 1B that are perspective and exploded views, respectively, of an exemplary jet-regulator (1) for a dual-stream tap, in accordance with embodiments of the present invention. The jet regulator (1) comprises:

a. a first channel for a first liquid stream (3), and b. a second channel for a second liquid stream (4),

wherein the second channel (4) includes a flow-through structure (5) for the passage of the second liquid stream. The flow-through structure (5) contains a hollow bottom surface (50). The hollow bottom surface (50) efficiently prevents the retraction of the second liquid into the second channel (4).

[0042]In this example, the first channel (3) may be an inner channel, while the second channel (4) may be an outer channel that encloses the inner channel (3), providing a compact and efficient design. The flow-through structure (5) encircles the inner channel (3).

[0043]As illustrated in Fig. 1A and 1B, the jet regulator (1)...

example 2

Dual-stream tap

[0052]Fig. 2A is a vertical cross-sectional view of a dual-stream tap (2) in accordance with embodiments of the present invention, illustrating an arrangement of the jet regulator (1) in accordance with embodiments of the present invention at the outlet of the tap (2). In this example, the jet regulator (1) of the present example is the same as that of Example 1.

[0053]In this example, the first channel (3) is depicted as an inner channel, while the second channel (4) is the outer channel that encloses or encircles the inner channel (3). The first channel (3) and the second channel (4) are completely separated from each other by a wall, ensuring that the two streams do not mix. The flow-through structure (5) with a hollow bottom surface (50) is located at the outlet of the tap (2). With the bottom surface is meant the surface of the flow-through structure (5) directed downstream, or, in other words, the outlet-sided surface of the flow-through structure (5).

[0054]In e...

Technical field of the invention

[0001] The present invention relates to the field of jet regulators for dual-stream taps.Background of the invention

[0002] Taps for dispensing liquids are an essential component of modern kitchens and households, providing a convenient source of water or other drinks, such as soft drinks, tea and coffee. One of the primary challenges in the field of taps is ensuring the delivery of high-quality water or other drinks while maintaining a user-friendly and aesthetically pleasing design. Consumers expect their taps to provide water or drinks that are free from contaminants, unwanted odors, and unpleasant tastes.

[0003] Dual-stream taps meet a need for versatility in the types of water delivered by the tap. For example, for some applications, consumers may prefer filtered, heated or chilled water, while for other applications, municipal water may be desired. Dual-stream taps typically provide multiple types of water, independently from each other, from the same tap. However, the design of the dual-stream tap end, or the point where the water is dispensed, plays a crucial role. The tap end should be optimized to minimize splashing and ensure a controlled flow of water, not only to enhance the convenience of use but also provide enhanced hygiene by reducing the potential for water spillage and contamination.

[0004] Furthermore, lime buildup is a problem with taps, as it may block the passage of liquid through the taps. In the state of the art, aerators exist having a flexible end surface. The flexible end surface allows the clogged liquid passage to be manually reopened by rubbing over this pattern. However, physical contact is possible in this process. This contact can lead to additional contamination or bacterial growth at the dispensing point.

[0005] Despite the advancements made in the field of taps, there is still room for improvement. Consumers continue to seek taps that offer reduced risk of clogging and improved quality of the dispensed liquid, such as reduced contamination. Thus, there is a need in the art for innovative designs that can effectively solve any of the above problems.Summary of the invention

[0006] It is an object of embodiments of the present invention to provide a good jet regulator for a dual-stream tap.

[0007] This objective is accomplished by a jet regulator for a dual-stream tap, and a dual-stream tap comprising the jet regulator, according to the invention.

[0008] In the first aspect, the present invention relates to a jet regulator for a dual-stream tap. The jet regulator comprises: a. a first channel for a first liquid stream, and b. a second channel for a second liquid stream. The second channel comprises a flow-through structure for passage of said second liquid stream, said flow-through structure having a hollow, or concave, bottom surface.

[0009] The inventors have observed that liquid (e.g., water) remains - after terminating the second liquid stream through the second channel - at the hollow or concave bottom surface of the second channel, so that the liquid surface is located below the bottom surface of the flow-through structure. Without being bound by theory, this appears to be a result of the improved interfacial area between said liquid and the bottom surface, due to the latter being hollow. The liquid then sticks to the hollow surface as a result of surface tension, and does not retract.

[0010] Thus, said liquid is effectively retained at the bottom surface of the flow-through structure, providing a liquid or water pocket at the bottom surface, and does not retract to components such as meshes or filters upstream of the flow-through structure. Therefore, lime scale buildup at the flow-through structure may be prevented, as lime may remain dissolved in the liquid or water pocket, or move sideways away from the bottom surface, preventing clogging of the flow-through structure by lime scale buildup. Furthermore, passage of air may be prevented so that any components within the second channel, upstream of the hollow bottom surface, remain wetted by the second liquid after terminating liquid flow. As such, the hollow bottom surface may reduce the buildup of lime scale on said upstream components, such as meshes or filters, effectively preventing clogging.

[0011] The bottom surface being hollow may mean that the bottom surface is concave or curved inward. In embodiments, a cross-section of the hollow bottom surface, in a plane perpendicular to a surface normal, may form a segment of a circle. For example, a radius of curvature of the bottom surface, e.g., of the segment of the circle, may be from 0.1 cm to 10 cm, for example from 0.2 cm to 5 cm. Said radius of curvature may depend on physical space and strength of the material, e.g., ribs, containing or defining the hollow bottom surface. Alternatively, a cross-section of the hollow bottom surface, in a plane perpendicular to a surface normal, may have a V shape or a U shape.

[0012] In embodiments, the first channel may be an inner channel, and the second channel may be an outer channel enclosing said inner channel. In embodiments, the inner channel may be substantially coaxial with the outer channel. In embodiments, the flow-through structure may encircle the inner channel. In embodiments, said flow-through structure may comprise substantially radially oriented ribs. The ribs may help keep the flow stable and laminar. Furthermore, spaces between adjacent ribs may be formed relatively broadly to prevent clogging. In embodiments, the ribs may be substantially conformal, so have a substantially conformal shape. In embodiments, the ribs may be substantially equidistant about the inner channel. This may provide even and uniform flow distribution of the second liquid stream.

[0013] In embodiments, the first channel may project downward with respect to said hollow bottom surface. In embodiments, a distance between a lower end of the first channel and a lower end of the bottom surface of the second channel is at least 1 mm or at least 5 mm or at least 1 cm, such as from 1 mm to 10 cm, from 5 mm to 10 cm or from 1 cm to 10 cm. It is an advantage of these embodiment that the first and second liquid stream may remain effectively separated, and cross-contamination between the first channel and the second channel may be effectively eliminated. Indeed, the projection provides a barrier for liquid retaining at the hollow bottom surface of the flow-through structure from moving into the first channel. Furthermore, the inventors have observed that, when the first channel is an inner channel and the second channel is an outer channel enclosing said inner channel, and when a second liquid flows from the second, outer channel, an air bubble is formed at the end of the first, downwardly projecting channel. Said air bubble effectively prevents any second liquid from entering the first channel. As such, when the first channel projects downward with respect to the hollow surface, components (such as sieves) of the first channel do not come into contact with the second liquid stream.

[0014] In embodiments, the flow-through structure may be located at an outlet of the second channel. Preferably, components within the second channel are located upstream of the flow-through structure.

[0015] In embodiments, the jet regulator may comprise, in the second channel, at least one second filter for blocking small particles, upstream of the flow-through structure. The second filter may prevent said small particles from leaving the tap, which could result in contamination In embodiments, the jet regulator may comprise, in the second channel, one or more second meshes for rendering the second liquid stream into a laminar flow, upstream of the flow-through structure, and downstream of the at least one second filter, if present. This specific location prevents small particles from clogging the second meshes, while at the same time preventing lime sedimentation on the second meshes.

[0016] Although the second liquid stream may be provided as a laminar flow, the invention is not limited thereto. Instead, the second liquid stream may be provided as an aerated liquid stream. A typical technique to obtain an aerated jet is by providing openings through a side wall of a housing of an aerator. Through these openings, air is drawn in with the second liquid stream, creating an aerated stream. The aerated liquid stream may alternatively be provided by: mechanical aeration involving devices like impellers, rotors, or propeller aspirators; diffused aeration typically using diffusers, e.g., porous devices that release air bubbles into the liquid; or surface aeration, comprising propelling the liquid into the air, breaking it into small droplets that absorb oxygen from the air.

[0017] In embodiments, the jet regulator may comprise, in the second channel and upstream of the flow-through structure, a structure comprising tapered holes, the tapered holes narrowing downstream. The tapered holes provide further flow control and help prevent splashing.

[0018] In embodiments, the filters may comprise or be formed of stainless steel, such as RVS 316L. Alternatively, the filters may comprise or be formed of a plastic.

[0019] In embodiments, the bottom surface or the flow-through structure comprises, or is formed of, a metal, such as stainless steel, or a polymer material, such as polyphenylsulfone. It is an advantage of these embodiments that polyphenulsulfone is suitable for contact with food, has a wide thermal range that allows sterilization via steam, and has a low absorption when exposed to solvents. Preferably, the flow-through structure does not repel water, but may be hydrophilic, although this is not strictly required and depends on the shape of the hollow bottom surface. For example, polyphenylsulfone typically provides a contact angle with water of 137°, and is generally considered hydrophobic, but appears to provide the effect of the present invention, with water remaining at the hollow or concave bottom surface as well. For example, materials or plastics normally used in taps may be used for the bottom surface or the flow-through structure. In embodiments, the contact angle (as a measure of hydrophilicity) for water on a material of which the hollow bottom surface or the flow-through structure is formed is less than 150°, preferably less than 140°. In some embodiments, the contact angle may be less than 120°, such as less than 90° (with a contact angle of less than 90° commonly being indicated as hydrophilic).

[0020] In the second aspect, the present invention relates to a dual-stream tap, comprising the jet regulator according to any embodiments of the first aspect.

[0021] In embodiments, the jet regulator may be present at an outlet of the tap. In embodiments the jet regulator may be used in a dispenser apparatus, which may be for example be a tabletop or portable apparatus.

[0022] In embodiments, the dual-stream tap may further comprise: a. a first tube fluidically coupled to the first channel, and b. a second tube fluidically coupled to the second channel.

[0023] In embodiments, the first tube may be fluidically coupled to a first liquid source. In embodiments, the second tube may be fluidically coupled to a second liquid source. The first liquid source may be different from the second liquid source. A first liquid stream may be provided, by the first liquid source, to the first channel and a second liquid stream may be provided, by the second liquid source, to the second channel. The first liquid stream may be different from the second liquid stream. For example, the purity or temperature may be different. A different purity may be the result of different filtering. One of the liquids may be tap water, while another of liquids is mineral water. As another example, one of the liquids may be still water, while the other liquid may sparkling water. As still another example, one of the liquids may be water, while the other liquid contains a beverage such as coffee, tea or a soft drink. As another example, the first (e.g., inner) channel may dispense heat or cooled liquids, while the second channel dispenses tap water.

[0024] As the first and second liquid stream may be of another type, it is preferred that the first and second liquid stream remain separated from each other. This may be effectively achieved by the jet regulator in accordance with embodiments of the present invention, preventing cross-contamination between the first and second liquid streams.

[0025] Particular and preferred aspects of the invention are set out in the accompanying independent and dependent claims. Features from the dependent claims may be combined with features of the independent claims and with features of other dependent claims as appropriate and not merely as explicitly set out in the claims.

[0026] Although there has been constant improvement, change and evolution of devices in this field, the present concepts are believed to represent substantial new and novel improvements, including departures from prior practices, resulting in the provision of more efficient, stable and reliable devices of this nature.

[0027] The above and other characteristics, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. This description is given for the sake of example only, without limiting the scope of the invention. The reference figures quoted below refer to the attached drawings.Brief description of the drawings

[0028] Fig. 1A is a perspective view of a jet regulator according to embodiments of the present invention. Fig. 1B is an exploded view of the jet regulator of FIG. 1A. Fig. 1C is a vertical cross-section of the jet regulator of FIG. 1A wherein water sticks to the hollow bottom surface. Fig. 2A and 2B are cross-sectional views of a dual-stream tap comprising the jet regulator according to embodiments of the present invention, with the second liquid stream and first liquid stream being dispensed, respectively. Fig. 3 is an exploded view of a dual-stream tap comprising the jet regulator according to embodiments of the present invention.

[0029] In the different figures, the same reference signs refer to the same or analogous elements.Description of illustrative embodiments

[0030] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn on scale for illustrative purposes. The dimensions and the relative dimensions do not correspond to actual reductions to practice of the invention.

[0031] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0032] Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other orientations than described or illustrated herein.

[0033] It is to be noticed that the term "comprising", used in the claims, should not be interpreted as being restricted to the means listed thereafter; it does not exclude other elements or steps. It is thus to be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. The term "comprising" therefore covers the situation where only the stated features are present and the situation where these features and one or more other features are present. The word "comprising" according to the invention therefore also includes as one embodiment that no further components are present. Thus, the scope of the expression "a device comprising means A and B" should not be interpreted as being limited to devices consisting only of components A and B. It means that with respect to the present invention, the only relevant components of the device are A and B.

[0034] Similarly, it is to be noticed that the term "coupled", also used in the claims, should not be interpreted as being restricted to direct connections only. The terms "coupled" and "connected", along with their derivatives, may be used. It should be understood that these terms are not intended as synonyms for each other. Thus, the scope of the expression "a device A coupled to a device B" should not be limited to devices or systems wherein an output of device A is directly connected to an input of device B. It means that there exists a path between an output of A and an input of B which may be a path including other devices or means. "Coupled" may mean that two or more elements are either in direct physical or electrical contact, or that two or more elements are not in direct contact with each other but yet still co-operate or interact with each other.

[0035] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments.

[0036] Similarly it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

[0037] Furthermore, while some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention, and form different embodiments, as would be understood by those in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0038] Furthermore, some of the embodiments are described herein as a method or combination of elements of a method that can be implemented by a processor of a computer system or by other means of carrying out the function. Thus, a processor with the necessary instructions for carrying out such a method or element of a method forms a means for carrying out the method or element of a method. Furthermore, an element described herein of an apparatus embodiment is an example of a means for carrying out the function performed by the element for the purpose of carrying out the invention.

[0039] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0040] The invention will now be described by a detailed description of several embodiments of the invention. It is clear that other embodiments of the invention can be configured according to the knowledge of persons skilled in the art without departing from the technical teaching of the invention, the invention being limited only by the terms of the appended claims.Example 1: Jet-regulator

[0041] Reference is made to Fig. 1A and Fig. 1B that are perspective and exploded views, respectively, of an exemplary jet-regulator (1) for a dual-stream tap, in accordance with embodiments of the present invention. The jet regulator (1) comprises: a. a first channel for a first liquid stream (3), and b. a second channel for a second liquid stream (4), wherein the second channel (4) includes a flow-through structure (5) for the passage of the second liquid stream. The flow-through structure (5) contains a hollow bottom surface (50). The hollow bottom surface (50) efficiently prevents the retraction of the second liquid into the second channel (4).

[0042] In this example, the first channel (3) may be an inner channel, while the second channel (4) may be an outer channel that encloses the inner channel (3), providing a compact and efficient design. The flow-through structure (5) encircles the inner channel (3).

[0043] As illustrated in Fig. 1A and 1B, the jet regulator (1) features a cylindrical lower housing (91) with a smooth, continuous surface, that may be tapering slightly towards the bottom. At the center, the inner channel (3) is visible, characterized by a circular opening. Encircling the inner channel (3) is the second channel (4), which includes a flow-through structure (5) with a hollow or concave bottom surface (50). The bottom surface (50) is the downstream oriented surface. A surface normal on the bottom surface (50) is typically directed substantially in the flow direction of the second liquid stream, that is, in the downstream direction. The bottom surface (50) typically faces downstream, or in the flow direction of the second liquid stream or jet. Thus, the bottom surface (50) typically faces the second liquid stream or jet after it leaves the jet regulator (1). The bottom surface (50) is preferably located at an exit or outlet of the jet regulator (1).

[0044] In this example, the flow-through structure (5) features substantially radially oriented ribs (51) that are equidistantly spaced around the inner channel (3), contributing to a conformal, stable and laminar flow of the second liquid stream. The hollow bottom surface (50) is concave, ensuring that liquid, e.g., water, remains at the end of the outer channel (4) after usage. For example, when water starts flowing through the second, outer channel (4), the water fills up the hollow or cavity first before flowing out of the jet regulator (1). When the flow rate is high enough, the water jet centers itself while keeping a laminar flow. When the flow of water stops, the water sticks to the concave bottom surface (50) as a result of surface tension, as shown in Fig. 1C that is a vertical cross-section of the jet regulator (1) wherein liquid or water (55) sticks to the concave bottom surface (50). This prevents lime-scale deposition at components in the second channel (4) upstream of the concave bottom surface (50), as well as in the first channel (3) as the sticking liquid or water (55) cannot move into the first channel (3). The latter also prevents cross-contamination.

[0045] The bottom surface (50) being hollow or concave typically means that - along a laterally outward direction from the first channel (3) - said bottom surface (50) is hollow or concave. The bottom surface (50) being hollow or concave may mean that - along a laterally outward direction from the first channel (3) - said bottom surface (50) curves inwards or has a retracted central portion, e.g., first curves upwards and then curves downwards. The bottom surface (50) being hollow or concave may mean that - along a laterally outward direction from the first channel (3) - said bottom surface (50) forms a ∩ or Λ shape. As such, within the vertical cross-sectional view of FIG. 1C, on each of both opposing, lateral sides of the first channel (3), the bottom surface (50) is hollow or concave.

[0046] Referring back to Fig. 1A and 1B, the inner channel (3) and / or the outer channel (4) may comprise first meshes (32) and second meshes (42), respectively, separated from each other by first spacers (34) and second spacers (44), respectively. These meshes (32, 42) are typically designed or adapted to render the liquid stream into a laminar flow to ensure minimal splashing and smooth water delivery. In particular, the present example provides three of each of these meshes (32, 42), so that a good laminar flow is provided. Herein, the three first meshes (32) may be identical, and / or the three second meshes (42) may be identical.

[0047] The jet regulator (1) may also include, in the second channel (4), at least one second filter (41) for blocking small particles, positioned upstream of the flow-through structure (5) to protect it from clogging. The first channel (3) may contain at least one corresponding first filter (not shown). The one or more second meshes (42) are, in this example, positioned upstream of the flow-through structure (5), and downstream of the second filter (41) so that particles are blocked by the second filter (41) and cannot clog the second meshes (42).

[0048] In the present example, the first channel (3) comprises - upstream of the first meshes (32) and first spacers (34) - a jet splitter (31) for splitting the first liquid stream in individual smaller water jets by pushing the water through holes typically having a small diameter. In the present example, the holes are tapered in a downstream direction, so the diameter reduces along a downstream direction. This may ensure a stable flow of the first liquid stream after passage through the jet splitter (31). In the present example, the holes are evenly divided over the jet splitter (31), but this is not strictly required.

[0049] For a corresponding purpose with respect to the second liquid stream, in the present example, the second channel (4) comprises a jet splitter contained in a cylindrical upper housing (92). In other words, the upper housing (92) contains a structure (43) comprising tapered holes, the tapered holes (430) narrowing downstream. In the present example, the upper housing (92) comprises - for ease of assembly - a recess for receiving the second filter (41). The jet regulator (1) is thus arranged such that water first passes through the second filter (41) before passing through said tapered holes (430). This may prevent clogging of the tapered holes (430).

[0050] In the present example, the lower housing (91) and the upper housing (92) are adapted to fit together by, for example, a detachable click connection. In the present example, the second meshes (42) and second spacers (44) are stacked between the flow-through structure (5) of said lower housing (91) and the structure (43) comprising tapered holes of said upper housing (92). Herein, the second meshes (42) and second spacers (44) are laterally restricted by side walls defining the outer channel (4) of the jet regulator (1). In the present example, the side walls are integral with the lower housing (91). In the present example, the jet splitter (31) fits on the inside of the lower housing (91) with a detachable click connection. The first meshes (32) and first spacers (34) are stacked between a ridge projecting from the walls of the inner channel (3) contained in the lower housing (91), and the jet splitter (31).

[0051] In the present example, the jet splitter (31) contains a spacer (not shown), for providing a space between the holes of the jet splitter (31) and the first meshes (32) underneath. The spacer may, for example, comprise a central wall projecting from the center of the bottom surface of the jet-splitter, and an outer wall projecting at the periphery from the bottom surface of the jet-splitter. Said spacer may - for ease of assembly - be integral with the jet splitter (31).Example 2: Dual-stream tap

[0052] Fig. 2A is a vertical cross-sectional view of a dual-stream tap (2) in accordance with embodiments of the present invention, illustrating an arrangement of the jet regulator (1) in accordance with embodiments of the present invention at the outlet of the tap (2). In this example, the jet regulator (1) of the present example is the same as that of Example 1.

[0053] In this example, the first channel (3) is depicted as an inner channel, while the second channel (4) is the outer channel that encloses or encircles the inner channel (3). The first channel (3) and the second channel (4) are completely separated from each other by a wall, ensuring that the two streams do not mix. The flow-through structure (5) with a hollow bottom surface (50) is located at the outlet of the tap (2). With the bottom surface is meant the surface of the flow-through structure (5) directed downstream, or, in other words, the outlet-sided surface of the flow-through structure (5).

[0054] In embodiments of the present invention, the bottom surface (50) being hollow may mean that the surface is concave. Herein, the vertical cross-section of said bottom surface (50) (i.e., the cross-section normal or perpendicular to the bottom surface (50)) may form part of a circle, e.g., half of a circle, or part of an ellipsoid, but this is not required. Generally, as understood by the skilled person, the bottom surface (50) being hollow or concave may mean that said surface (50) curves inward or has a retracted central portion. This hollow shape ensures a large interfacial area between the liquid and the surface (50), so that surface forces may result in retention of the liquid at the surface (50).

[0055] The first channel (3), that is in this example an inner channel (3), projects downward - so in the flow direction or in the downstream direction - with respect to the hollow bottom surface (50) of the flow-through structure (5) in the outer channel (4). It has been observed by the inventors that, as a result of the projecting part of the first, inner channel (3), when a second liquid stream (55) (indicated by the dashed lines), e.g., water, flows through the second, outer channel (4), an air bubble (550) exists at the outlet (33) of the first channel (3). Said air bubble (550) effectively blocks the second liquid stream (55) from entering the first channel (3). As a result, contamination of the first, inner channel (3) by liquid from the second liquid stream (55) may be effectively averted.

[0056] In addition, as is shown in FIG. 2B, as the first channel (3) projects past a lower end of the hollow bottom surface (50) of the flow-through structure (5) in the outer channel (4), a first liquid stream leaving the inner channel (3) typically cannot contact any second liquid (55) sticking to or located at the hollow bottom surface (50). As such, the projecting inner channel (3) may effectively prevent cross-contamination - in both directions - between the first (3) and second channel (4).

[0057] Simultaneous reference is made to Fig. 3, showing an exploded view of the dual-stream tap (2) of the present example. The tap neck (8) features an inner thread at its lower end, designed to engage with the outer thread of a housing connector (26). The housing connector (26) is cylindrical and includes two O-rings (260) for sealing. In turn, a jet regulator housing (27) with the jet regulator (1) contained in its inner space, contains an inner thread for mounting on the housing connector (26) that contains a corresponding outer thread. The housing connector (26) thus allows for connecting the tap neck (8) to the jet regulator housing (27), with the jet regulator (1) housed in the latter.

[0058] Within the tap neck (8), an inner tube (7) carries a first liquid stream, that may, for example, be filtered water, cooled water (± 4°C), sparkling water, or hot water (max. 98 °C). The inner tube (7) terminates in an inner tube connector (28), which, in turn, engages with an inner jet connector (29) connected to the jet regulator (1). An inner tube filter may be provided in the inner tube connector (28) for preventing small particles from entering the jet regulator (1). The inner jet connector (29) has a star-shaped outer ring (290) that allows said first liquid stream to flow from the tap neck (8) to the jet regulator (1). The inner jet connector (29) can freely rotate and is held in place by the housing connector (26). A jet regulator gasket (270) ensures a waterproof connection between the housing connector (26) and the jet regulator (1).

[0059] The jet regulator (1) contains the upper housing (92) and lower housing (91) that fit together with a detachable click connection, and that were further described in Example 1. The jet regulator (1) is free to rotate within the jet regulator housing (27). As the jet regulator housing (27) is connected to the housing connecter (26), all inner components (e.g., filters and meshes contained in the jet regular (1)) are pushed into place. The jet regulator (1) contains an inner channel (3) that is fluidically coupled to the inner tube (7), in this example via the inner tube connector (28) and inner jet connector (29).

[0060] In this example, a second liquid stream, which may be tap water, is provided through the tap neck (8) that is thus serving as a second tube. The second liquid stream is fluidically separated from the first liquid stream that is contained in the inner tube (7) passing through the tap neck (8). The second tube (8) is fluidically connected to the outer channel (4) of the jet regulator (1). The second liquid stream passes along an outside of the inner tube connector (28) and inner jet connector (29) to enter the outer channel (4) of the jet regulator. The overall design of the jet regulator (1) ensures that the two types of water from the first, inner channel (3) and the second, outer channel (4) remain fully separated until they exit the jet regulator (1).

[0061] It is to be understood that although preferred embodiments, specific constructions and configurations, as well as materials, have been discussed herein for devices according to the present invention, various changes or modifications in form and detail may be made without departing from the scope of this invention. Steps may be added or deleted to methods described within the scope of the present invention.

Examples

example 1

Jet-regulator

[0041]Reference is made to Fig. 1A and Fig. 1B that are perspective and exploded views, respectively, of an exemplary jet-regulator (1) for a dual-stream tap, in accordance with embodiments of the present invention. The jet regulator (1) comprises:

a. a first channel for a first liquid stream (3), and b. a second channel for a second liquid stream (4),

wherein the second channel (4) includes a flow-through structure (5) for the passage of the second liquid stream. The flow-through structure (5) contains a hollow bottom surface (50). The hollow bottom surface (50) efficiently prevents the retraction of the second liquid into the second channel (4).

[0042]In this example, the first channel (3) may be an inner channel, while the second channel (4) may be an outer channel that encloses the inner channel (3), providing a compact and efficient design. The flow-through structure (5) encircles the inner channel (3).

[0043]As illustrated in Fig. 1A and 1B, the jet regulator (1)...

example 2

Dual-stream tap

[0052]Fig. 2A is a vertical cross-sectional view of a dual-stream tap (2) in accordance with embodiments of the present invention, illustrating an arrangement of the jet regulator (1) in accordance with embodiments of the present invention at the outlet of the tap (2). In this example, the jet regulator (1) of the present example is the same as that of Example 1.

[0053]In this example, the first channel (3) is depicted as an inner channel, while the second channel (4) is the outer channel that encloses or encircles the inner channel (3). The first channel (3) and the second channel (4) are completely separated from each other by a wall, ensuring that the two streams do not mix. The flow-through structure (5) with a hollow bottom surface (50) is located at the outlet of the tap (2). With the bottom surface is meant the surface of the flow-through structure (5) directed downstream, or, in other words, the outlet-sided surface of the flow-through structure (5).

[0054]In e...

Claims

1. A jet regulator (1) for a dual-stream tap (2), the jet regulator (1) comprising: a first channel (3) for a first liquid stream and a second channel (4) for a second liquid stream, wherein the second channel (4) comprises a flow-through structure (5) for passage of said second liquid stream, said flow-through structure (5) having a concave bottom surface (50).

2. The jet regulator (1) according to claim 1, wherein the first channel (3) projects downward with respect to said concave bottom surface (50).

3. The jet regulator (1) according to claim 1 or 2, wherein the first channel (3) is an inner channel, and the second channel (4) is an outer channel enclosing said inner channel (3).

4. The jet regulator (1) according to claim 3, the flow-through structure (5) encircling the inner channel (3).

5. The jet regulator (1) according to claim 4, wherein said flow-through structure (5) comprises substantially radially oriented ribs (51).

6. The jet regulator (1) according to claim 5, wherein the ribs (51) are substantially equidistant about the inner channel (3).

7. The jet regulator (1) according to any of claims 3 to 6, wherein the inner channel (3) is substantially coaxial with the outer channel (4).

8. The jet regulator (1) according to any of the previous claims, wherein the flow-through structure (5) is located at an outlet (40) of the second channel (4).

9. The jet regulator (1) according to any of the previous claims, comprising, in the second channel (4), at least one second filter (41) for blocking small particles, upstream of the flow-through structure (5).

10. The jet regulator (1) according to any of the previous claims, comprising, in the second channel (4), one or more second meshes (42) for rendering the second liquid stream into a laminar flow, upstream of the flow-through structure (5), and downstream of the at least one second filter (41), if present.

11. The jet regulator (1) according to any of the previous claims, comprising, in the second channel (4) and upstream of the flow-through structure (5), a structure (43) comprising tapered holes, the tapered holes (430) narrowing downstream.

12. A dual-stream tap (2), comprising the jet regulator (1) according to any of the previous claims.

13. The dual-stream tap (2) according to claim 12, wherein the jet regulator (1) is present at an outlet of the tap (2).

14. The dual-stream tap (2) according to claim 12 or 13, further comprising: a first tube (7) fluidically coupled to the first channel (3), and a second tube (8) fluidically coupled to the second channel (4).

Images