Patent Application
20160198891
This application claims priority to European Patent Application No. 15405001.7, filed Jan. 9, 2015, which application is hereby incorporated by reference in its entirety.
The invention relates to a beverage outlet for a beverage preparation machine, for example for a coffee maker, comprising an outlet tube, one end of which can be connected to the beverage preparation machine and the other end of which has an outlet opening for dispensing a beverage from the beverage preparation machine, as well as comprising a beverage guide element, which runs coaxially to the outlet tube and a first section of which is arranged inside the outlet tube and a second section of which projects out of the outlet opening of the outlet tube. The invention furthermore relates to a beverage preparation machine comprising such a beverage outlet.
Beverage outlets are known from the prior art and are used, for instance, in coffee makers, in particular in fully automatic coffee makers, or the like. The central beverage guide element, which is arranged coaxially to the outlet tube and which partially projects out of the latter, thereby serves to calm the beverage flow, which escapes from the outlet opening, for instance the coffee stream. It is also known that a relatively large inner diameter of the outlet tube, for instance of more than 6 mm, can also contribute to calm the escaping beverage stream.
Beverage guide elements, which, for example, have four wings in the shape of a cross or star, which extend radially outwards relative to the longitudinal direction of the beverage guide element, are thus known from the prior art from time to time. The first section of the beverage guide element, which is arranged inside the outlet tube, can have a length of 3.5 mm, for instance, while the second section typically projects only a few millimeters, maximally 3 mm, out of the outlet opening of the outlet tube. In addition, provision can be made for the wing cross to be embodied in the shape of a pyramid in outlet direction. The pyramid tip in the center of the escaping beverage stream thereby serves as drip edge or drip tip, respectively.
However, it turned out that the escaping beverage stream is oftentimes still too turbulent from time to time in spite of the presence of beverage guide elements. In the case of coffee makers, in particular in the case of fully automatic coffee makers, contaminations occur in many cases on the machine front, the cup tray and the tray base, which are caused by splashes of the coffee stream, which escapes from the coffee outlet. These splashes furthermore lead to undesired, brown scatter stains on the surface of the white milk froth, for instance when obtaining a cappuccino. Such splash effects, however, do not only occur in the case of coffee outlets of coffee makers, but for instance also in the case of outlets of milk frothers on coffee makers or in the case of other beverage preparation machines, for instance in the case of tee preparation machines or beverage preparation machines, which allow to obtain different beverages and liquids, for example soups, tees, coffees, etc..
It is thus the object of the invention to specify a beverage outlet for a beverage preparation machine of any type, but in particular for coffee makers, as well as a beverage preparation machine, in particular a coffee maker, in the case of which the beverage stream escapes from the outlet opening in a significantly calmer manner and in the case of which the afore-described splash effects are furthermore avoided or are at least minimized.
This object is solved by means of a beverage outlet as well as a beverage preparation machine, embodiments of which are detailed herein. Further advantageous embodiments of the invention are detailed herein.
It has been recognized in a manner according to the invention that the unrest and the splashes of the escaping beverage stream are caused by trapped air in the beverage stream. In the case of a coffee maker, for instance, for example in the case of a fully automatic coffee maker, comprising a closed fluid system, that is, in the case of a coffee maker, which does not have pressure compensating openings or other pressure compensating options, from the brewing unit to the coffee outlet, air is trapped in the fluid path after obtaining coffee as a result of the opening and closing of the brewing unit. The next time coffee is obtained, this trapped air moves with the prepared beverage in the direction of the beverage outlet. On the way there, the trapped air expands further as a function of the cross section of the fluid path and can then lead to the formation of beverage air bubbles in the area of the outlet opening, which then typically burst in response to and shortly after escaping the beverage outlet, which leads to the undesired splash effects and to the unrest moments in the escaping beverage stream.
To counteract this, the invention makes provision in the case of the afore-described beverage outlets for the outlet tube to have at least one notch, which extends frontally from the outlet opening-side end of the outlet tube opposite to the beverage dispensing direction and which forms a passage opening between the inner and the outer area of the outlet tube.
As a result, it is attained that the air, which is trapped in the fluid path, can escape from the outlet tube very quickly to the side through the at least one notch, before larger beverage air bubbles, which could then burst subsequently, are created at the outlet opening.
According to an advantageous embodiment of the invention, the at least one notch can have a semicircular, rectangular, square, triangular or trapezoidal contour or shape, respectively (in each case viewed in a direction, which extends radially to the longitudinal axis or central axis, respectively, of the outlet tube through the at least one notch). These shapes can be embodied as frontal notches in the outlet tube in a particularly simple manner and ensure a sufficient lateral air discharge.
Provision can thus be made, for example, for the width of the notch in circumferential direction of the outlet tube and the depth of the notch in longitudinal direction of the outlet tube to be approximately 1.5 mm in the case of a rectangular notch.
In the case of a particularly preferred embodiment of the invention, provision is made for the at least one notch on the outlet opening-side end of the outlet tube to have a width in circumferential direction of the outlet tube, which is larger than or equal to the depth of the notch in longitudinal direction of the outlet tube. It turned out that the formation of bubbles at the outlet opening can be avoided through this in a particularly effective manner.
To increase the lateral air discharge capability, provision is made in the case of a further advantageous embodiment of the invention for the outlet tube to have a plurality of, in particular two, three, four, five, six or seven, preferably three such notches, which are preferably distributed evenly across the circumference of the outlet tube.
To destroy bubbles, which are created in the outlet tube in spite of frontal notches, in the formation phase prior to becoming larger, provision can be made in the case of a further advantageous embodiment of the invention for the outlet opening-side end of the outlet tube to have an acute-angled or rectangular edge towards the central axis of the outlet tube. Because it is sharp-edged, such an acute-angled or rectangular edge has the effect that bubbles, which are created, are cut directly at the outlet opening, so that only minimal splash effects occur, if applicable, because, due to the notch, such residual bubbles are only very small—if anything.
In addition, provision can be made for the inner diameter of the outlet tube to be reduced as compared to the outlet tubes, which are known from the prior art, so that bubbles, which might possibly be created in spite of the notches according to the invention, remain as small as possible. Advantageously, the inner diameter of the outlet tube is thus smaller than 5 mm, preferably smaller than or equal to 4.6 mm.
In addition to the notches, the beverage guide element provided according to the invention, in particular the second section of the beverage guide element, which projects out of the outlet opening in beverage dispensing direction, has the effect that, on the one hand, the beverage stream, which escapes from the outlet opening, is guided and calmed. On the other hand, the second section, which projects out below the outlet opening-side end of the outlet tube, has the effect that possible small residual bubbles are carried away with the beverage stream and thus possibly burst only later, for instance in a mug, glass, cup or the like, located underneath the beverage outlet.
To optimally utilize this advantageous effect of the second projecting section of the beverage guide element, provision can be made in an advantageous embodiment of the invention for the second section of the beverage guide element to project at least 4 mm, preferably at least 6 mm, from the outlet opening of the outlet tube.
According to a further advantageous embodiment of the invention, a beverage guide element, which is designed in a particularly simple manner, yet which acts in a highly effective manner, is embodied as cylinder comprising a round, square or evenly polyhedral cross section, at least area by area, in particular in the first and/or in the second section of the beverage guide element.
In the alternative or in addition, the beverage guide element can have at least one wing, which extends from the central axis of the outlet tube radially to the outside, at least in the area of the second section. Such a wing supports the guiding and calming of the beverage stream, which escapes form the outlet opening, in an advantageous manner. This effect is increased in an advantageous manner, when the at least one wing extends in longitudinal direction of the beverage guide element across the entire length of the second section and/or also extends across the first section of the beverage guide element at least area by area.
With the same goal as well as to support the wing against the outlet tube, provision can be made for the at least one wing to extend radially to the outlet opening-side end of the outlet tube and/or to the inside of the outlet tube, in particular to be connected to the outlet opening-side end and/or to the inside of the outlet tube.
According to a further advantageous embodiment of the invention, the at least one wing can furthermore have a wing edge, which points in beverage dispensing direction and which is inclined in beverage dispensing direction towards the central axis of the outlet tube at an angle of less than 90°, in particular of larger than 45°, preferably of below 60°. As a result, it is attained that the escaping beverage stream is guided towards the central axis of the outlet tube and is thus concentrated on the central axis of the outlet tube and is centered relative to the central axis of the outlet tube.
Advantageously, the beverage guide element can have a plurality of wings comprising a wing edge of the afore-mentioned type. The latter leads to a particularly strongly pronounced centering of a beverage stream, which escapes from the outlet opening, relative to the central axis of the outlet tube. In addition, possible remainders of beverages, which trickle out of the outlet after the beverage is dispensed, can drain centrally in the area of the central axis of the outlet tube due to the inclined wing edge.
In an advantageous manner, the beverage guide element has a plurality of, in particular two, three, four, five, six or seven, preferably three wings, which are distributed evenly in particular with regard to the circumference of the outlet tube.
To optimally utilize the advantageous effect of the notches in the outlet tube with the effect of the wings, provision is made in the case of a further advantageous embodiment of the invention for the number of the wings to correspond to the number of the notches on the outlet tube, wherein one notch is preferably assigned in each case to each segment space between two adjacent wings.
Preferably, the beverage guide element is embodied in one piece with the at least one wing.
The instant invention furthermore relates to a beverage preparation machine, for example a coffee maker, in particular a fully automatic coffee machine, comprising a beverage outlet according to the invention, as described above.
Further goals, advantages and possible uses of the instant invention follow from the description below of an exemplary embodiment by means of the drawings.
In the case of both embodiments of the beverage outlet 1 shown in
In the case of both embodiments according to
The beverage guide element 120, 220, in particular the second section 122, 222, which projects out of the outlet opening in beverage dispensing direction D, has the effect that the beverage stream, which escapes from the outlet opening 111, 211, is guided and calmed. In addition, the second section 122, 222, which projects out below the outlet opening-side end 112, 212 of the outlet tube 110, 210, has the effect that small bubbles, which might be present, are carried away with the beverage stream prior to bursting and thus possibly burst only later, for instance in a mug, glass or cup, located underneath the beverage outlet 1. Preferably, the second section 122, 222 of the beverage guide element 120, 220 projects at least 4 mm, in the case at hand approximately 6 mm, from the outlet opening 111, 211 of the outlet tube 110, 210 for this purpose.
To already suppress the creation of bubbles, the outlet tube 110, 210 according to the invention has at least one notch 115, 215, which extends frontally from the outlet opening-side end 112, 212 opposite to the beverage dispensing direction D and which forms a passage opening between inner and outer area of the outlet tube 110, 210. As a result, it is attained that the air, which is trapped in the fluid path, can escape from the outlet tube 110, 210 very quickly to the side through the at least one notch 115, 215, before larger beverage air bubbles, which could then burst subsequently (that is, downstream from the outlet opening-side end 112, 212 of the outlet tube 110, 210 with regard to the beverage dispensing direction D), are created at the outlet opening 111, 211.
In the two alternative embodiments of the beverage outlet 1 according to
In particular, the width B of each notch 115, 215 in circumferential direction of the outlet tube 110, 210 is equal to the depth T of the notch 115, 215 in longitudinal direction of the outlet tube 110, 210. In the case at hand, the depth T and the width B is 1.5 mm in each case. However, it is preferred to select the width B of each notch 115, 215 to be larger than the depth T. This is so, because it turned out that this specific embodiment of the notches 115, 215 is particularly well suited to ensure a sufficiently effective lateral air discharge from the outlet tube 110, 210.
In addition, the outlet opening-side end 112, 212 in both embodiments of the outlet tube 110, 210 has a rectangular and thus sharp edge 113, 213 towards the central axis M of the outlet tube 110, 210, which has the effect that bubbles, which are nonetheless created in spite of notches 115, 215, are cut directly at the outlet opening 111, 211, so that only minimal splash effects occur, if applicable.
In addition, provision can be made for the inner diameter of the outlet tube 110, 210 to be chosen as small as possible, so that bubbles, which might possibly be created in spite of the notches according to the invention, remain as small as possible. The inner diameter of the outlet tube 110, 210 in the case of the two exemplary embodiments at hand is thus 4.6 mm.
In the case of the embodiment according to
As can in particular be seen in
In the case of the second embodiment of the invention according to
The wings 223 further extend radially to the outlet opening-side end 212 of the outlet tube 210 or to the inside of the outlet tube 210, respectively. In particular, the wings 223 in the exemplary embodiment shown in the case at hand are connected to the outlet opening-side end 212 and to the inside of the outlet tube 210. As a whole, the beverage guide element 220 comprising the wings 223 is embodied in one piece in terms of a simple and cost-efficient production.
In addition, the three wings 223 in each case have a wing edge 224, which points in beverage dispensing direction D and which is inclined at an angle α of 60° in beverage dispensing direction D towards the central axis M of the outlet tube 210. As a result, the three-winged, star-like beverage guide element 220 has a pyramid-shaped end section, which points in beverage dispensing direction D and which makes it possible for beverage residues, which trickle, to drain centrally in the area of the central axis M of the outlet tube 110.
| Number | Date | Country | Kind |
|---|---|---|---|
| 15405001.7 | Jan 2015 | EP | regional |
