Patent Publication Number: US-2009217823-A1

Title: System for preparing a predetermined amount of beverage suitable for consumption, exchangeable holder, and apparatus for such a system

Description:
The invention relates to a system for preparing a predetermined amount of beverage suitable for consumption, provided with an exchangeable holder and an apparatus provided with a fluid dispensing device which is detachably connected with the holder for in use dispensing under pressure at least an amount of first fluid such as a liquid and/or a gas, in particular such as water and/or steam, to the exchangeable holder, wherein the exchangeable holder is provided with at least one storage space which is filled with a second fluid such as a concentrate, wherein the holder is further provided with at least a first mixing chamber, at least one outflow opening which is in fluid communication with the first mixing chamber for dispensing the beverage from the first mixing chamber, wherein in use at least one fluid communication between the storage space and the first mixing chamber for dispensing the second fluid to the first mixing chamber is present, wherein the holder comprises at least one inlet opening which in use is detachably connected with an outlet opening of the fluid dispensing device for supplying the first fluid to the first mixing chamber, wherein the fluid dispensing device is arranged for supplying the first fluid under pressure to the first mixing chamber, so that in the first mixing chamber the first fluid and the second fluid mix together for obtaining beverage which thereupon leaves the exchangeable holder via the outflow opening. 
     Such a system is known. 
     In the known system, the apparatus is provided with a fluid dispensing device with an outlet opening which can be detachably connected with the inlet opening of the exchangeable holder for dispensing the first fluid to the first mixing chamber. In use, after connecting the outlet opening with the inlet opening, the first fluid is spouted into the first mixing chamber, where this fluid mixes with a second fluid which is for instance already present in the first mixing chamber or is introduced into the first mixing chamber simultaneously with the first fluid. 
     A disadvantage of the known system is that the discharge opening of the nozzle can only be positioned inaccurately, or with little accuracy, in front of the inlet opening of the holder, so that the first fluid, in use, is inaccurately supplied from the fluid dispensing device into the first mixing chamber. As a result, it is possible that the first fluid chiefly hits an inner wall of the first mixing chamber adjacent the inlet opening of the first mixing chamber. The first fluid will then flow along an inner wall as the first mixing chamber is being filled. In this way, no optimum mixing of the first and the second fluid is obtained, so that the beverage eventually prepared does not possess the desired properties or quality. 
     The object of the invention is to provide a system with which this disadvantage can be prevented. More specifically, the object of the invention is to provide a system in which the discharge opening of the fluid dispensing device can be positioned accurately before the inlet opening of the holder, whereby in use the first fluid can be supplied into the first mixing chamber in a desired manner, whereby a proper mixing of the first and the at least second fluid is obtained. 
     To achieve this objective, the holder of the system according to the invention is further provided with a stop against which a fluid supply element of the fluid dispensing device forming at least a part of the outlet opening abuts in use, such that in use the first fluid is supplied through the inlet opening of the holder into the first mixing chamber and then, along a certain path within the first mixing chamber, does not hit any inner walls of the first mixing chamber. By means of such a stop, the fluid supply element forming at least a part of the outlet opening, upon each renewed use of the system, is positioned in the same manner before the inlet opening of the holder. In use, the outlet opening comes to lie in the desired position before the inlet opening of the holder, after which the fluid dispensing device can supply the first fluid under pressure to the first mixing chamber. Since during the supply of the first fluid to the first mixing chamber the fluid, along a certain path within the first mixing chamber, does not hit any inner walls of the first mixing chamber, the first fluid forms a jet which ends up with a particular speed in the first mixing chamber. Because the jet, after traversing the certain path, strikes an inner wall somewhere in the first mixing chamber with a particular speed, this jet will be rebounded, which causes whirls in the first and/or second fluid, which promotes a proper mixing. Preferably, in use, the outlet opening is situated before the inlet opening of the holder, while using the outlet opening a jet of the first fluid is formed which spouts direct into the first mixing chamber. According to a further elaboration of the invention, the inlet opening of the holder preferably also forms an inlet opening of the first mixing chamber. 
     The certain path which the first fluid travels in the first mixing chamber preferably has a length of at least one-third of a length of the first mixing chamber viewed in a direction of the entering fluid. This minimum length of the certain path provides for a better rebound, resulting in better whirls for further promoting a proper mixing of the beverage. Also, the minimum length of the certain path ensures that air can be drawn into the jet of the first fluid, so that an airy beverage or a beverage provided with a froth layer can be prepared. The above-mentioned inner wall is preferably an inner wall of the first mixing chamber that is situated opposite the inlet opening of the first mixing chamber, which inner wall of the first mixing chamber is first hit by the entering first fluid. Preferably, the inner wall extends substantially perpendicularly to the direction of the path which the entering first fluid follows within the first mixing chamber. Such an inner wall receives the jet of the first fluid that is spouted into the first mixing chamber with a particular speed, whereby the inner wall provides for the rebound of the jet, which further promotes turbulence in the first fluid, the second fluid and/or the beverage. 
     In a further elaboration of the invention, the stop extends substantially parallel between a first wall bounding the first mixing chamber and a second wall, situated opposite the first wall, bounding the first mixing chamber, while preferably a distance from the stop to the first wall and a distance from the stop to the second wall are substantially equal, or a distance from a plane through the stop to a plane through the first wall is substantially equal to a distance from the plane through the stop to a plane through the second wall. 
     Such a positioning of the stop provides that the outlet opening of the fluid supply element is favorably situated relative to both the first and the second wall bounding the mixing chamber at the time of supply of the first fluid to the first mixing chamber, so that the chance of the fluid hitting an inner wall of the first mixing chamber adjacent the inlet opening is further reduced. Also in the event of small tolerances in the dimensions of the exchangeable holder, for instance in the thickness of the stop, the outlet opening will be positioned relative to the inlet opening such that the first fluid, even then, is supplied to the first mixing chamber without hitting the inner walls along the certain path. 
     According to a further elaboration of the invention, the outlet opening is formed at least for a part by the fluid supply element, provided on the apparatus, having a first fluid channel, while in use adjacent an end of the fluid channel a first nozzle is provided for dispensing the first fluid. Such a nozzle accomplishes a desired shape of the jet of fluid, the behavior of the jet of fluid being determined by the nozzle, so that no unexpected deflection or otherwise unwanted direction of entry of the jet of fluid occurs. Also, by varying the diameter of the nozzle, the kind of jet can be determined, for instance a strong jet or a mist. In this way, the first fluid is spouted into the inlet opening in a manner desired for the beverage to be prepared. 
     According to a further elaboration of the invention, the first nozzle may be formed at least for a part by a groove and/or channel provided in a side of the stop situated opposite the fluid supply element, substantially transversely to the fluid channel, while the groove and/or the channel extends from the fluid channel to the inlet opening. Such a nozzle is simple to manufacture because it is manufactured with the exchangeable holder. Further, such a nozzle does not need to be cleaned since, along with the exchangeable holder, it is taken from the system after preparation of the beverage. For a next beverage to be prepared, a new nozzle is used which is provided in the new exchangeable holder. 
     In another elaboration of the invention, the first nozzle may be formed at least for a part by a groove, which is provided in a side of the fluid supply element situated opposite the stop, substantially transversely to the fluid channel, and a side of the stop situated opposite the fluid supply element, while the groove extends from the fluid channel as far as an outermost side of the fluid supply element. Such a nozzle is relatively easy to clean. What is also accomplished by this construction of the nozzle is that instances of clogging of the nozzle are comparatively rare. Such a nozzle provides that with each exchangeable holder, the first fluid is spouted from the fluid supply element into the first mixing chamber in the same manner. 
     In a further elaboration of the invention, the stop comprises an abutment surface which has substantially an equal shape and equal dimensions to the side of the fluid supply element situated opposite the stop. Thus, the fluid supply element fits onto the stop in just a single manner and/or position, which further promotes accurate positioning of the nozzle relative to the inlet opening of the first mixing chamber. 
     According to a further elaboration of the invention, the stop is provided with a notch or a protrusion, which notch or protrusion is situated substantially opposite the groove in the side of the fluid supply element situated opposite the stop and substantially connects to circumferential edges of the groove for forming a larger or a smaller nozzle, respectively. Through such a notch or protrusion that may be provided in the exchangeable holder, the diameter of the nozzle can be adjusted. In this way, it is possible to supply more or less fluid to the first mixing chamber during a same unit of time. For instance, in preparing a particular beverage, it may be desired to supply more fluid to the first mixing chamber in a shorter period than when preparing a different beverage. Owing to the notch, or the protrusion, being provided in the exchangeable holder, always the right nozzle is formed that is needed for the concentrate present in the holder, for preparing the associated beverage. 
     In a further elaboration of the invention, the system is provided with at least one gas supply opening which is, or can be set, in fluid communication for supplying gas, such as air or CO 2 , to the beverage in the system. Such a gas supply opening is for instance favorable for preparing a beverage with a fine-bubble froth layer or, for instance, a carbonated beverage. Preferably, such a gas supply opening can be formed by a second fluid channel provided in the fluid supply element, with the first fluid channel being arranged for supplying the first fluid, for instance water or steam, while the second fluid channel is arranged for supplying gas, for instance air or CO 2 . 
     In a further elaboration of the invention, an end of the second fluid channel is situated substantially above an end of the first nozzle in an outermost sidewall of the fluid supply element viewed from the side of the fluid supply element situated opposite the stop. If the fluid supply element is placed on the stop in the proper manner, both the first fluid, for instance hot water, and simultaneously also air can be supplied to the first mixing chamber. In this way, for instance a frothy hot cocoa can be prepared if a cocoa concentrate is provided in the storage space. 
     According to a further elaboration of the invention, slidably around the fluid supply element, a closing means is provided, which closing means is slidable from an open position in which the end of the second fluid channel and the end of the first nozzle are open, to a closed position in which one of the ends is closed to supply only the first fluid to the first mixing chamber or to supply only gas, such as air or CO 2 , to the first mixing chamber, respectively. According to a further elaboration of the invention, it is then preferred that the stop is provided with a cam, the cam being arranged to bring the closing means in use to a desired position and to keep it in a desired position. Depending on the kind of concentrate comprised by the exchangeable holder, for instance, there may or may not be a cam provided on the stop. If the concentrate merely requires that, in preparing the beverage, water be supplied to the concentrate, the cam on the stop will be arranged such that the outlet opening is closed to air. If both air and water are to be added to the concentrate, no cam will be provided on the stop of the exchangeable holder, or, for instance, a cam which is arranged such that the end of the second fluid channel and the end of the first nozzle are open. 
     In another embodiment of the invention, an end of the second fluid channel may be situated in the same plane in which the first fluid channel extends and be situated adjacent the end of the first fluid channel. It is possible that, according to a further elaboration of the invention, an end of the second fluid channel is in fluid communication with the first nozzle. Both the first fluid, for instance the hot water, and the air are supplied to the first mixing chamber via the same nozzle. Here, the stop, in a further elaboration of the invention, can comprise a closing cam which in use at least partly closes the fluid communication between the second fluid channel and the first nozzle. This closing cam may for instance be provided if only the first fluid is desired for preparing the beverage, for instance tea, where no froth layer is desired. 
     In a further embodiment of the invention, adjacent the end of the second fluid channel, a second nozzle is provided for dispensing gas, such as air or CO 2 , to the first mixing chamber. According to a further elaboration of the invention, the second nozzle may be formed at least for a part by a groove and/or channel, provided in a side of the stop situated opposite the fluid supply element, substantially transversely to the second fluid channel, while the groove and/or the channel extends from the second fluid channel to the inlet opening, while the first and second nozzles are situated substantially next to each other viewed from the side of the stop situated opposite the fluid supply element. The second nozzle, too, like the first nozzle when it is manufactured in this way, is replaced when exchanging the holder. 
     It is also possible, according to a further elaboration of the invention, that the second nozzle is formed at least for a part by a groove, which is provided in a side of the fluid supply element situated opposite the stop, substantially transversely to the second fluid channel, and a side of the stop situated opposite the fluid supply element, while the groove extends from the fluid channel as far as an outermost side of the fluid supply element, while the nozzles are situated substantially next to each other, viewed from the side of the fluid supply element situated opposite the stop. The second nozzle, too, is easy to manufacture in this way and also easy to clean, which is favorable to hygienic aspects of the system. 
     In a further elaboration of the invention, rotatably about the fluid supply element, a closing means may be provided which is rotatable from an open position, in which an end of the second nozzle and an end of the first nozzle are open, to a closed position, in which one of the ends is closed to supply only the first fluid to the first mixing chamber or to supply only gas, such as air or CO 2 , to the first mixing chamber, respectively. Such a closing means works in a same manner as the slidable closing means mentioned earlier. This closing means, too, can be positioned such that, for instance depending on the concentrate in the exchangeable holder, only the first fluid can be supplied, only air can be supplied or both can be supplied to the first mixing chamber simultaneously. 
     According to a further elaboration of the invention, the stop comprises at least one of a notch and/or a protrusion which in use is situated opposite at least one of the grooves of the first and second nozzles, while the at least one notch and/or protrusion substantially connects to circumferential edges of the respective grooves for respectively enlarging, reducing or closing the at least one nozzle. Such notches and/or protrusions provide an enlarged or reduced nozzle which, depending on the kind of concentrate in the holder, supplies a desired quantity of first fluid and/or gas in a particular unit of time to the first mixing chamber. Depending on the beverage to be prepared, the magnitude, more in particular the diameter of the nozzle, can be determined. If for instance the second fluid is a coffee concentrate and the first fluid is hot water and a cup of coffee with a slight froth layer is to be prepared, the second nozzle can be chosen to be relatively small by providing for instance a relatively large protrusion on the stop opposite the second nozzle. For instance for preparing a frothy cocoa from a cocoa concentrate and hot water, the second nozzle can be relatively large, for instance with a comparable diameter to the first nozzle. A large amount of air is then supplied to the first mixing chamber simultaneously with the hot water, so that the first and the second fluid mix and simultaneously are provided with much air in order to obtain the frothy composition. 
     Further, for preparing the beverage, a user of the system does not need to perform any extra operations to regulate the supply of the first fluid and/or the gas, such as air, to the first mixing chamber, since this is automatically done by the construction of the stop. 
     According to a further embodiment of the invention, between the side of the fluid supply element situated opposite the stop, and the side of the stop situated opposite the fluid supply element, a sealing is provided. Such a sealing forms a fluid-tight closure between the fluid supply element and the first mixing chamber and prevents leakage of the first fluid and/or air to other parts of the apparatus. Also, no loss of the fluid occurs during the supply of the fluid to the first mixing chamber. In this way, an accurate dosing of the first fluid is ensured, so that the beverage obtains the desired concentration. 
     In a further elaboration of the invention, the sealing comprises at least one sealing groove and a sealing edge fitting into the sealing groove, while the sealing groove extends adjacent the circumferential edge of the side of the fluid supply element situated opposite the stop and the sealing edge extends adjacent the circumferential edge of the side of the stop situated opposite the fluid supply element, or vice versa. In use, when the fluid supply element has been placed on the stop, the sealing edge falls into the sealing groove, thereby forming the sealing. 
     According to a further elaboration of the invention, the system may be provided with a control device for controlling the fluid dispensing device. Such a control device can for instance be arranged such that the fluid dispensing device independently supplies the first fluid and the gas to the first mixing chamber. Thus, for instance, first the first fluid may be supplied and after that an amount of air. It is also possible, however, that the fluid dispensing device is controlled to supply the first fluid and the air simultaneously. It is clear that also a different order of supply of the first fluid and air can be effected by the control. 
     In a further elaboration of the invention, the stop is rigid. Such a stop has as an advantage that the stop does not deform when the fluid supply element is placed on it, which limits deviations in the positioning of the outlet opening relative to the inlet opening of the first mixing chamber. In another embodiment of the invention, in use, under the stop, a retainer member is provided, such that when the fluid supply element is situated on the stop, the stop cannot deform. When the stop is not rigid, the retainer member can be placed under the stop, such that the stop retains its shape when the fluid supply element is placed on it. In this way, too, deviations in the positioning of the outlet opening relative to the inlet opening will be limited. 
     The invention further relates to an exchangeable holder arranged to be connected with an apparatus provided with a fluid dispensing device for in use dispensing under pressure at least a first fluid such as a gas and/or liquid to the exchangeable holder for preparing a beverage suitable for consumption, wherein the exchangeable holder is provided with at least one storage space which is filled with a second fluid such as a concentrate, wherein the holder is further provided with at least a first mixing chamber, at least one outlet opening which is in fluid communication with the first mixing chamber for dispensing the beverage from the first mixing chamber, wherein in use at least one fluid communication between the storage space and the first mixing chamber for dispensing the second fluid to the first mixing chamber is present, wherein the holder comprises at least one inlet opening which, in use, is detachably connected with an outlet opening of the fluid dispensing device for supplying the first fluid to the first mixing chamber, wherein the fluid dispensing device is designed for supplying the first fluid under pressure to the first mixing chamber, so that in the first mixing chamber the first fluid and the second fluid mix together for obtaining the beverage which thereupon leaves the exchangeable holder via the outflow opening, wherein the holder is further provided with a stop against which a fluid supply element of the fluid dispensing device forming at least a part of the outlet opening abuts in use, such that in use the first fluid is supplied through the inlet opening of the holder into the first mixing chamber and then, along a certain path within the first mixing chamber, does not hit any inner walls of the first mixing chamber. 
     Such an exchangeable holder has the same advantages and effects as those mentioned in connection with the system described above. 
     Finally, the invention relates to an apparatus for use in a system as described above. Such an apparatus provides equal advantages to those mentioned in connection with the above-described system. 
     Further advantageous embodiments of the invention are set forth in the dependent claims. 
    
    
     
       The invention will now be further elucidated with reference to the drawing, in which 
         FIG. 1   a  shows a first embodiment of a system for preparing a predetermined amount of beverage suitable for consumption; 
         FIG. 1   b  shows the system according to  FIG. 1   a  in operational condition; 
         FIG. 1   c  shows the system according to  FIG. 1   a  in operational condition; 
         FIG. 2   a  shows a top plan view of an exchangeable holder; 
         FIG. 2   b  shows a partly perspective view of the exchangeable holder from  FIG. 2   a  and the fluid supply element; 
         FIGS. 3   a - 3   d  schematically show cross sections A-A′ of different embodiments of the holder and the fluid supply element from  FIG. 2   b;    
         FIG. 4   a  shows a schematic cross section B-B′ of an embodiment of the holder and the fluid supply element from  FIG. 2   b;    
         FIG. 4   b  shows a perspective bottom view of a fluid supply element; 
         FIG. 4   c  shows a perspective view of a part of the holder; and 
         FIG. 5  shows a schematic cross section B-B′ of an embodiment of the holder and the fluid supply element from  FIG. 2   b.    
     
    
    
     Reference is first made to  FIGS. 1   a - 1   c . In  FIG. 1 , reference numeral  1  designates a system for preparing a predetermined amount of beverage suitable for consumption. The system (see  FIG. 1   a ) is provided with an exchangeable holder  2 . It is noted that an embodiment of the holder  2  will be described in more detail later, with reference to  FIGS. 2   a - b ,  3   a - d ,  4   a - b  and  5 . The system  1  is further provided with an apparatus  4  which is provided with, inter alia, a fluid dispensing device  6  arranged for dispensing, under pressure, at least one amount of at least a first fluid such as a liquid and/or a gas, more particularly such as water and/or steam. In this example, in use, the fluid dispensing device  6  dispenses water. The fluid dispensing device  6  will also be described in more detail later, as will the cooperation of the fluid dispensing device  6  with the exchangeable holder  2 . In  FIGS. 1   a - 1   c , for the purpose of the initial description of the system and its operation, the holder  2  and the fluid dispensing device  6  are as yet only represented in a highly schematic manner. 
     The exchangeable holder  2  is provided with at least one storage space  8 , which is filled with a second fluid, such as a beverage, a concentrate or a powder. In this example, the storage space  8  is formed by a rigid wall. However, this is not requisite. In this example, a concentrate for preparing coffee is involved. The holder  2  is further provided with at least a first mixing chamber  10  and at least one outflow opening  12 , which is in fluid communication with the first mixing chamber  10 . The holder  2  is further provided with a fluid communication  14  between the storage space  8  and the first mixing chamber  10 . The holder  2  is furthermore provided with at least one inlet opening  16 , which is detachably connected with an outlet opening  18  of the fluid dispensing device  6 . In  FIG. 1   a , the inlet opening  16  has not yet been connected with the outlet opening  18 , while in  FIG. 1   b  it has been connected. In this example, the inlet opening  16  in  FIG. 1   a  is still closed off by a closure that can be removed, such as a removable seal. This also holds for the outflow opening  12 . In use, both removable seals are removed whereupon the outlet opening  18  can be connected with the inlet opening  16  as shown in  FIG. 1   b.    
     In this example, the system is further provided with a restriction  20  which is included in a fluid flow path  22  which extends, via the outlet opening  18  of the fluid dispensing device  6 , the inlet opening  16  and the first mixing chamber  10 , from the fluid dispensing device  6  to the outflow opening  12 . 
     More particularly, it holds in this example that the restriction  20  is included in a fluid flow path  22  which extends, via the outlet opening  18  of the fluid dispensing device  6  and the inlet opening  16  of the exchangeable holder  2 , from the fluid dispensing device  6  to the first mixing chamber  10 . 
     The storage space  8  forms at least a part of a dosing device  24  as will be further explained hereinafter. In this example, this dosing device  24  is further provided with a needle  24  which, in use, is pierced through a wall of the storage space  8  for supplying a third fluid to the second fluid in the storage space  8  for dispensing the second fluid in a dosed manner to the first mixing chamber  10 . In this example, the dosing device  24  is further provided with a fluid dispensing unit  32  which is connected to the needle  28 . The fluid dispensing unit  32  and the needle  28  form part of the apparatus  4 . The fluid dispensing unit  32  is detachably connected, in this example at least via the needle  28 , with the holder  2 . 
     The apparatus  4  is further provided with a control device  34  for controlling the fluid dispensing device  6  and the fluid dispensing unit  32 . To control the fluid dispensing device  6  and the fluid dispensing unit  32 , the control device  34  generates control signals ŝ which are supplied to the fluid dispensing device  6  and the fluid dispensing unit  32 . In this example, the control device  34  is designed for controlling the fluid dispensing device  6  and the fluid dispensing unit  32  independently of each other. 
     The system  1  described up to this point works as follows. For the purpose of preparing a predetermined amount of beverage suitable for consumption, the exchangeable holder  2  is placed in the apparatus  4 . Here, the storage space  8  of the exchangeable holder  2  is placed under the needle  28 . Also, as shown in  FIG. 1   b , the outlet opening  18  is connected to the inlet opening  16 . The apparatus is now ready for use. For instance by pushing a button  36  of the control device  34 , the control device causes the fluid dispensing unit  32  to move the needle  28  in the direction of the arrow Pa. As a result, the needle  28  is pierced through a wall of the storage space  8  and the third fluid is supplied under pressure to the second fluid in the storage space. As a result, the third fluid will apply a pressure and/or force to the second fluid. As a result, in this example, the pressure in the storage space  8  will increase. Here, the fluid communication  14  may for instance be provided with a sealing  38 , for instance in the form of a breakable membrane  38  which, as a result of the increase of the pressure in the storage space  8  resulting from the supply of the third fluid, tears open. As a result, in this example, the coffee concentrate will flow in a dosed manner from the storage space  8  via the fluid communication  14  to the first mixing chamber  10 . Simultaneously, the control device  34  causes the fluid dispensing device  6  to be activated. This has as a result that the fluid dispensing device  6  starts to dispense the first fluid, in this example water, under pressure. In this example, this water is hot water with a temperature of, for instance, 80-98° C. This hot water flows via the fluid flow path  22  to the restriction  20 . Having arrived at the restriction  20 , by means of the restriction  20  a jet of the hot water is generated. This jet spouts via the outlet opening  18  and the inlet opening  16  into the first mixing chamber  10 . In the first mixing chamber  10 , the hot water will start mixing well with the concentrate. Here, the flow rate at which the concentrate is supplied to the first mixing chamber  10  is regulated by the control device  34 , through control of the fluid dispensing unit  32 . Further, the flow rate at which the hot water is supplied to the first mixing chamber  10  is also regulated by the control device  34  through control of the fluid dispensing device  6 . In the first mixing chamber, as a result of the jet, the concentrate will mix well with the hot water, so that the beverage is formed. This beverage can then leave the outflow opening  12  and be captured in, for instance, a cup  40 . 
     Since in the system  1  according to the invention both the dosing of the concentrate over time and the dosing of the hot water over time can be regulated well, it can be provided that the concentration of the amount of concentrate in the beverage can be accurately determined. Furthermore, it can be provided that the beverage which, during its preparation, leaves the outflow opening  12 , is of constant quality, i.e., the concentration of the concentrate in the beverage that is dispensed can be kept substantially constant during dispensing, if so desired. The fact is that in this example, the flow rate of the water and the flow rate of the concentrate that are supplied to the first mixing chamber  10  can each, if so desired, be controlled independently of each other. Therefore, it holds in this example, that the system  1  is designed such that the fluid dispensing device  6  and the dosing device  24  can supply, independently of each other, the first fluid and the second fluid, respectively, to the first mixing chamber  10 . This implies that the magnitude of the flow rate of the first fluid and the period during which the first fluid is dispensed are independent (in this example through control of the control device) of the magnitude of the flow rate of the second fluid and the period during which the second flow is dispensed. 
     It further holds in this example that the dosing device  24  is a controllable and active dosing device for supplying the second fluid to the first mixing chamber by applying an increased pressure or force to the second fluid. Herein, an active dosing device is understood to mean that the second fluid flows through the fluid communication from the storage space to the first mixing chamber as a result of an excess pressure or force applied on the side of the storage space. 
     In the example, the system  1  is further provided with an air inlet opening  42 . The air inlet opening  42  ensures that air is supplied to the first mixing chamber  10  so that, in use, air is beaten into the beverage for obtaining a beverage with a fine-bubble froth layer. Thus, a café crème can be obtained. In this example, the air inlet opening  42  is in fluid communication with the first mixing chamber  10  downstream of the restriction  20 . In this example, the air inlet opening  42  terminates, via a fluid communication  44 , in the fluid flow path  22 . In this example it therefore holds that the air inlet opening  42  and the restriction  20  each form part of the apparatus  4 . However, this is not requisite. It will be clear that the air inlet opening  42  and/or the restriction  20  can form part of the exchangeable holder  2 . 
     After the beverage, in this example coffee with a fine-bubble froth layer, has been prepared, the control device  34  stops the fluid dispensing device  6 . The control device  34  also ensures that the third fluid is no longer supplied to the second fluid in the storage space, and that the needle  28  is retracted from the respective wall of the storage space  8 , i.e., in a direction opposite that of the arrow Pa. Here, it may be that the control device  34  first provides that the dispensing of the second fluid to the first mixing chamber is stopped and that after that, the supply of the first fluid (in this example water) is stopped. Thus, the risk of the second fluid contaminating, for instance, the restriction  20  is reduced. 
       FIG. 1   c  shows a situation where the needle  28  is pierced through a wall of the storage space  8  and the third fluid is supplied under pressure to the second fluid in the storage space  8 . The situation shown occurs at the moment at which the control device  34  will stop the supply of hot water to the first mixing chamber  10 , will no longer cause the third fluid to be supplied to the second fluid in the storage space  8 , and will cause the needle  28  to be retracted from the respective wall of the storage space  8  so that the holder  2  may thereupon be taken from the apparatus  4  again. 
     After this, a user can remove the exchangeable holder  2  and, if a new amount of beverage is to be prepared, place a new exchangeable holder in the apparatus  4 . The new exchangeable holder may be provided with an entirely different type of second fluid, such as, for instance, a milk concentrate. When, with the aid of the new exchangeable holder, milk is prepared in a manner comparable to that as described for the preparation of coffee based on coffee concentrate, no trace of the previously prepared type of beverage will be found in the milk prepared. The reason is that the first mixing chamber  10  forms part of the exchangeable holder and when a new exchangeable holder is placed in the apparatus  4 , also an entirely new and hence clean first mixing chamber is placed in the holder. Accordingly, there can be no contamination involved. 
     In the example of  FIGS. 1   a - 1   c , the dosing device  24  is designed for supplying the third fluid under pressure to the second fluid in the storage space  8  for dispensing the second fluid in a dosed manner to the first mixing chamber  10 . It will be clear that in addition or as an alternative, the dosing device  24  may be provided with a compression unit for compressing the storage space  8  for dispensing the second fluid to the first mixing chamber  10  in a dosed manner, as described, for instance, in WO 2006/043808. 
     In the example of  FIGS. 1   a - 1   c , the jet of the first fluid spouts into the first mixing chamber  10 . It is possible that here, the jet strikes an inner wall of the first mixing chamber  10 , whereby swirls are formed in the first mixing chamber  10 , with the result that concentrate, the first fluid and optionally air are mixed together. It is also possible that the jet strikes a jet impact element in the first mixing chamber  10 . Upon impact of the jet on the jet impact element, the liquid is atomized, allowing air to be properly beaten in. 
     Reference is now made to  FIGS. 2   a  and  2   b . The exchangeable holder  2 , storage space  8 , first mixing chamber  10 , outflow opening  12 , fluid communication  14 , and inlet opening  16  shown in  FIGS. 1   a - 1   c , are indicated in the other  FIGS. 2-5  as, respectively, the holder  102 , the storage space  108 , the first mixing chamber  110 , the outflow opening  112 , the fluid communication  114 , and the inlet opening  116 . Since the general operation of the holder and the system have already been described with reference to  FIGS. 1   a - 1   c , the description with reference to  FIGS. 2-5  will be limited to the differences and further elaborations of the holder and the system. 
       FIG. 2   a  shows a top plan view of an exchangeable holder according to an embodiment of the invention. The holder  102  in this example comprises a blister package and may for instance be a disposable package, with a first portion  102   a  being preferably a deep-drawn part, for instance from a plastic, and a second portion (not shown) being a covering (see  FIGS. 3-5 ) of, for instance, film. 
     The holder  102  has two storage spaces  108 ,  109 , which both can comprise different second fluids, for instance concentrates, for instance a coffee concentrate and a milk concentrate for preparing for instance cappuccino or café au lait. It is noted that in the example shown, the holder  102  has two outflow openings  112 . 
     The holder is further provided with a stop  117 , against which a fluid supply element (not shown) of the fluid dispensing device  6  (see  FIGS. 1   a - 1   c ) forming at least a part of the outlet opening  18  (see  FIGS. 1-1   c ) abuts in use, such that in use the first fluid is supplied through the inlet opening  116  of the first mixing chamber  110  and then, along a certain path within the mixing chamber  110 , does not hit any inner walls of the first mixing chamber. This will be clarified with reference to  FIGS. 3   a - 3   d.    
     Reference is now made to  FIG. 2   b , showing a partly perspective view of a holder  102  and the fluid supply element  118  forming at least a part of the outlet opening  18 . The inlet opening  116  of the holder  102  also forms the inlet opening  116  of the first mixing chamber  110 . The first mixing chamber  110  has an inner wall  111  which is situated opposite the inlet opening  116  of the first mixing chamber  110 . This inner wall  111  is the inner wall of the first mixing chamber  110  which in this example, in use, i.e. when the fluid supply element  118  of the fluid dispensing device has been placed on the stop  117 , is hit first by the entering first fluid. The entering fluid will in use strike against the wall  111  in the direction represented by arrow R 2 . Preferably, the inner wall  111  extends substantially perpendicularly to the direction of the path (direction R 2 ) which the entering first fluid in use follows within the first mixing chamber  110 . The path traveled in use by the first fluid in the first mixing chamber  110  preferably has a length of at least one-third of the length of the first mixing chamber  110  viewed in the direction R 2  of the entering first fluid. The second fluid may already be present in the first mixing chamber  110  at entry of the first fluid or be simultaneously supplied to the first mixing chamber  110 . As a result of the first fluid striking against the inner wall  111 , swirls arise in the fluid, so that the fluid mixes properly, thereby forming a beverage of the desired quality. It is also possible that the inner wall  111  is positioned at a different location within the first mixing chamber for instance to obtain different whirls and/or other mixing properties. In use, the fluid supply element  118  is placed in direction R 1  into the holder  102 , such that a side  118   a  of the fluid supply element  118  situated opposite the stop lies on the stop  117  upon placement. The covering (not shown) may also be provided over the inlet opening  116 . In that case, the fluid supply element  118 , when the system is put into operation, is inserted through the sealing before it is positioned against the stop  117 . The stop  117  comprises an abutment surface  117   a  which is arranged for receiving the side  118   a  of the fluid supply element  118  situated opposite the stop. The abutment surface  117   a  has substantially an equal shape and equal dimensions to the bottom side  118   a  of the fluid supply element  118 , in this exemplary embodiment substantially round. The stop  117  is rigid in this exemplary embodiment and therefore retains its shape when the fluid supply element  118  is placed on the abutment surface  117   a . In another embodiment, when the stop  117  is not rigid, a retainer member (not shown) may be provided in the apparatus  4  which in use is placed under the stop  117 . Such a retainer member prevents the stop from deforming when the fluid supply element  118  is placed on the stop  117 . In the fluid supply element  118   a  first fluid channel  119  is provided, through which fluid can be displaced from the fluid dispensing device to the outlet opening  18  of the fluid supply element  118 . 
     Reference is now made to  FIG. 3   a , showing a schematic cross section A-A′ of an embodiment of the holder  102  and the fluid supply element  118 . In  FIG. 3   a  the position of the fluid supply element  118  and the holder  102  in use is represented. The side  118   a  of the element  118  that is situated opposite the stop lies on the abutment surface  117   a  of the stop  117  of the holder  102 . The outlet opening  18  is situated opposite the inlet opening  116  of the holder  102 , while, in use, using the outlet opening  18   a  jet of the first fluid is formed which spouts direct into the first mixing chamber  110 . The stop  117  is therefore arranged for cooperating with the fluid supply element  118  forming the outlet opening  18 . The stop  117  extends substantially parallel between a first wall  110   a  bounding the first mixing chamber and a second wall  110   b  of the first mixing chamber  110 , situated opposite the first wall, bounding the first mixing chamber. Preferably, the distance h 1  from a plane through the stop  117  to a plane through the first wall  110   a  of the first mixing chamber  110  is substantially equal to the distance h 2  from the stop to the second wall  110   b  of the first mixing chamber  110 . Since the jet flows into the first mixing chamber  110  approximately in the middle, what is prevented is that the fluid flows into the first mixing chamber  110  along the inner walls. Thus a proper mixing of the first and the second fluid is obtained. It is noted that the first wall  110   a  of the first mixing chamber  110  bounding the first mixing chamber is formed by the covering  199  and the second wall  110   b  of the first mixing chamber  110 , bounding the first mixing chamber, is formed by a part  102   a  of the holder  102  remote from the covering. The nozzle  120  is provided adjacent an end of the first fluid channel  119  and is arranged to dispense the first fluid and supply it into the inlet opening  116  of the first mixing chamber  110 . The nozzle  120  is formed by a groove  122  which is provided in the side  118   a  of the fluid supply element  118 , situated opposite the stop, in this example substantially transversely to the fluid channel  119 . It will be clear that the fluid channel can also extend at different angles relative to the groove. The groove extends from fluid channel  119  as far as an outermost side  118   b  of the fluid supply element  118 . Such a nozzle  120  is easy to clean and will not readily clog up. The stop  117  is arranged for cooperating with a nozzle  120  of the fluid supply element  118 , while the nozzle  120  may be formed at least for a part by a groove and/or channel provided in the fluid supply element  118 . For this purpose, the stop  117  may be flat, so that the volume and the cross section of the nozzle  120  are determined entirely by the groove  122 . However, as is shown in  FIG. 3   b , the stop  117  may be provided with a notch  125 . In use, this notch  125  is situated opposite the groove  122  of the nozzle  120  in the side  118   a  of the fluid supply element  118  situated opposite the stop. The notch  125  has substantially identical circumferential edges to the groove  122 . In this way, the volume and the cross section of the nozzle  120  are determined by the joint volumes and cross sections of the groove  122  and the notch  125 , so that a larger nozzle  120  is formed. In this way, the nozzle  120  can be adjusted in such a way that the nozzle  120  is suitable for the concentrate present in the holder  102  and the associated beverage to be made. It is also possible that the stop  117  is not provided with a notch  125  but with a protrusion. In that case, the protrusion will reduce the volume and the cross section of the groove  122 , so that a smaller nozzle  120  is obtained. By varying in notches and/or protrusions, the most suitable shape of the cross section and the size of the cross section of the nozzle  120  can be determined by the holder  102 , for instance depending on the content thereof. A consumer therefore does not need to perform any extra operations after placing the holder  102  in the apparatus  4 , since the holder  102  determines the size of the nozzle  120 . In use, depending on the shape and size of the cross section of the nozzle  120 , a jet of the first fluid is generated which is then spouted into the inlet opening  116 . In the general description of  FIGS. 1   a - 1   c  it has been described that a restriction  20  may be included in a fluid flow path  22 . Alternatively, the nozzle  20  may form the restriction, but the restriction may also be provided in the nozzle  120  (not shown). The restriction can generate a jet, but also for instance a mist. It will be clear that any other shape of the entering first fluid can be determined by a particular restriction. 
     In  FIG. 3   c , another embodiment of the invention is shown. In this embodiment, the system is provided with a gas supply opening which is, or can be set, in fluid communication for supplying gas, such as air or CO 2 , to the beverage in the system. The gas supply opening is formed by a second fluid channel  121  which is arranged for supplying for instance air to the fluid present in the first mixing chamber  110 . The end of the second fluid channel  121 , the outlet opening  123   a , is situated above an end of the first nozzle  120  in the outermost sidewall  118   b  of the fluid supply element  118 , viewed from the side  118   a  of the fluid supply element  118  situated opposite the stop  117 . The second fluid channel  121  is likewise connected with the fluid dispensing device. As mentioned earlier in the description with reference to  FIGS. 1   a - 1   c , a control device may be provided for controlling the fluid dispensing device. This control device can control the fluid dispensing device for independently determining the pressure, amount and/or temperature of the first fluid and air which is operatively supplied to the first mixing chamber  110  depending on the desired beverage. The first fluid and the air can be supplied to the first mixing chamber  110  simultaneously or consecutively. The control device may control the fluid dispensing device depending on a code that may be provided on the holder  102 . 
     In  FIG. 3   d , a further elaboration of the exemplary embodiment of  FIG. 3   c  is represented. Provided slidably around the fluid supply element  118  is a closing means  124 . This closing means  124  is slidable from an open position to a closed position in which one of the ends  18 ,  123   a  is closed. In this case, the outlet opening  123   a  of the second fluid channel  121  is closed, so that no air ends up in the first mixing chamber  110 . Naturally, it is also possible to close off just the first fluid channel  119 , so that only air is supplied to the first mixing chamber  110 . For bringing the closing means  124  either in an open or in a closed position, a cam  125  is provided on the stop  117 . This cam  125  stops the closing means  124  in part when the fluid supply element  118  is being placed on the stop  117 . Clearly, by variation in the cam  25 , different positions of the closing means  124  can be obtained. It is also possible to incorporate the setting of the closing means  124  into an open or closed position in the earlier-mentioned code on the holder. The control device can then on the basis of this information in the code control the closing means as well. In that case, no cam  125  needs to be provided on the stop  117 . It will be clear that it is also possible for the closing means to close off both ends  18 ,  123   a , for instance in an inoperative condition, for instance to prevent contamination. 
     Such a closing means may also be provided in the embodiment of the invention as represented in  FIGS. 4   a  and  4   c . In this embodiment of the invention, the two fluid channels  119 ,  121  extend in a same plane and the respective nozzles  120 ,  123  are situated substantially next to each other, viewed from the side  118   a  of the fluid supply element  118  situated opposite the stop. The second nozzle  123  in this exemplary embodiment is formed by a groove which in this example extends substantially transversely to the second fluid channel  121  and runs approximately parallel to the first nozzle  120 . A similar closing means to that represented in  FIG. 3   d , which may work similarly, may in this case be provided rotatably around the fluid supply element  118  (not shown). This closing means may also be brought into an open or closed position by e.g. a cam which is provided on the stop  117  or by the control device which is controlled by information on the position of the closing means that is included in a code provided on the holder. 
     In  FIG. 4   b , a perspective bottom view of a further embodiment of the invention is shown, in which the end of the second fluid channel  121  is in fluid communication with the first nozzle  120  which is connected with the first fluid channel  119 . In this way, only one outlet opening  18  is needed for simultaneously supplying the first fluid and air to the first mixing chamber  110 . Such a fluid communication between the second fluid channel  121  and the nozzle  120  can be closed in a simple manner with a closing cam (not shown) which may be provided on the stop  117 , if supply of air to the first mixing chamber  110  is unwanted, for instance when preparing a frothless beverage such as tea. 
     In  FIG. 4   c , a perspective view of the stop  117  is shown, where two notches  125 ,  126  are provided which in use are situated opposite the grooves of the first nozzle  120  and the second nozzle  123 , while in this example the circumferential edges of the notches  125 ,  126  substantially connect to the respective circumferential edges of the grooves of the nozzles  120 ,  123 . In this way, two enlarged nozzles are obtained. Naturally, instead of notches  125 ,  126 , also protrusions may be provided as described earlier with reference to  FIG. 3   b . By variation in the size of the nozzles  120 ,  123 , both a beverage with a slight froth layer can be prepared, viz. if the nozzle  123  for air is relatively small, and a frothy beverage if the nozzle  123  for air is relatively large. 
     Finally,  FIG. 5  shows an embodiment of the invention in which a sealing  128  is provided between the side  118   a  of the fluid supply element  118  situated opposite the stop, and the side of the stop  117  situated opposite the fluid supply element, the abutment surface  117   a , for fluid-tight closure of the fluid supply element  118  on the holder  102 . This sealing  128  prevents leakage of air and/or the first fluid, such as hot water or steam, outside the fluid flow path  22  (see  FIGS. 1   a - 1   c ). This sealing comprises a sealing groove  129  which is provided adjacent the circumferential edge of the stop  117  and a sealing edge  130  which fits in the sealing groove  129 , the sealing edge  130  extending adjacent the circumferential edge of the side  118   a  of the fluid supply element  118  situated opposite the stop. The sealing  128  may also comprise a groove  129  on the side  118   a  of the fluid supply element  118  situated opposite the stop, and an edge  130  on the stop  117 . Also other forms of sealings provided between the fluid supply element  118  and the stop  117  are options. 
     It will be clear that the invention is not limited to the exemplary embodiment described. Various modifications are possible within the framework of the invention as set forth in the appended claims. The stop of the exchangeable holder may for instance be provided with at least one groove and/or channel for forming at least one nozzle, arranged for operatively cooperating with a fluid channel that is provided in the fluid supply element. The groove and/or the channel is then provided in a side of the stop situated opposite the fluid supply element, substantially transversely to the fluid channel, and extends from the fluid channel to the inlet opening. In such an embodiment of the holder, it is not necessary that a groove is provided in the fluid supply element. The fluid supply element can therefore be made of relatively simple design and along with the exchangeable holder the nozzle is replaced, so that it does not need to be cleaned. Evidently, the nozzle may be formed in the stop by merely a groove, merely a channel or a combination of a groove and a channel, extending from an end of the at least one fluid channel to the inlet opening of the first mixing chamber to spout fluid into the first mixing chamber. Further, it is clear that different shapes of the groove and/or the channel also belong to the invention. 
     Further, an exchangeable holder, instead of comprising one or two storage spaces for a further second fluid, may also comprise more than two storage spaces for several possibly different second fluids. The second fluids may for instance be miscible with and/or soluble in the first fluid. In the example, the storage spaces were filled with coffee concentrate and/or milk concentrate. Other fluids, whether or not based on concentrate, are also conceivable. To be considered here, for instance, are a squash or powder for preparing a lemonade. When through the second fluid channel of the fluid supply element CO 2  is supplied to the first mixing chamber, a carbonated lemonade can be prepared. The apparatus may further be provided with additional storage spaces which may for instance be filled with additives such as, for instance, soluble powders or concentrates. These powders too may be supplied to the first mixing chamber for instance through displacement using a third fluid, or by emptying the respective storage space through squeezing. Here, for instance, flavor enhancers, sugars, cocoa and the like can be involved. Also, milk powder and/or milk creamer can be considered. Generally, it holds that the second fluid, apart from being a liquid such as a concentrate, can also be a powder and the like, which is for instance soluble in the first fluid or miscible with the first fluid, for instance soluble in a liquid such as water. Also, a second fluid in the storage space may comprise both a concentrate and a powder, whether or not in mixed form. 
     Such variants are each and all understood to fall within the framework of the invention. The temperature of the first fluid can vary. For instance, the first fluid can also consist of water at room temperature, or cold water. Also, the temperature of the first fluid which is supplied to the holder for preparing a beverage may vary over time. Further, the gas supply opening may be arranged for supplying air or CO 2  to the first mixing chamber. However, it is also possible for steam to be supplied to the first mixing chamber through the gas supply opening. The control device can control the fluid dispensing device for dispensing the first fluid and/or the gas to the first mixing chamber through the fluid supply element, but may also control any closing means for closing at least one outlet opening. The control device can also control the fluid supply element for the positioning thereof on the stop. 
     The volume of a storage space may for instance vary from 5 to 150 ml, more particularly from 6 to 50 ml. A passage opening of the restriction can for instance vary from 0.4 to 1.5 mm, more particularly from 0.6 to 1.3 mm, still more particularly from 0.7 to 0.9 mm. The pressure at which, in use, the liquid dispensing device dispenses the first fluid can vary from 0.6 to 12 bar, more particularly from 0.7 to 2 bar, preferably from 0.9 to 1.5 bar. The period during which the first fluid is supplied to the first mixing chamber for preparing the beverage can vary from 2 to 90 seconds, more particularly from 10 to 50 seconds. The size of the air inlet opening, when this is fully opened, can vary from, for instance, 0.005 to 0.5 mm 2 .