Milk frothing device and associated beverage dispenser

Abstract

The milk frothing device (28) comprises a mixing element (42) comprising a mixing portion, a hot water / steam inlet aperture, and a main flow conduit connecting the hot water / steam inlet aperture to the mixing portion; a closing portion (96) movable relative to the mixing element (42), and a milk supply conduit connected to the main flow conduit. The closing portion (96) includes at least one viewing window (97) facing the mixing portion when the closing portion (96) is in the closed position.

Description

Field of the Invention

[0001] The present invention relates to the field of beverage dispensing machines, and more particularly to preferably automatic coffee machines. More specifically, the present invention relates to the field of milk foaming devices for use in conjunction with beverage dispensing machines, such as coffee machines. Such foaming devices in particular allow the production of beverages based on coffee and milk foam when they are combined with a coffee machine. Background Art

[0002] A milk foaming device is known from WO2005 / 063093, which comprises:

[0003] - a mixing element, comprising:

[0004] + a mixing part;

[0005] + a hot water / steam inlet hole and a main flow pipe connecting the hot water / steam inlet hole to the mixing part;

[0006] - a closing part which moves between a closed position and an open position relative to the mixing element, in the closed position, the closing part closes the mixing part and the main flow pipe, and in the open position, the mixing part and the main flow pipe are open and accessible to allow cleaning of the mixing part and the main pipe; and

[0007] - a milk supply pipe connected to the main flow pipe.

[0008] The specific construction of the milk foaming device described in document WO2005 / 063093, more specifically the specific construction of the mixing part and the closing part, allows the cleaning of the milk foaming device.

[0009] However, such a foaming device is still complex to use and does not guarantee optimized foaming performance over time. Summary of the Invention

[0010] The present invention aims to overcome these drawbacks.

[0011] The technical problem on which the present invention is based is to provide a foaming device whose use is simplified and the foaming performance of milk is improved.

[0012] To this end, the present invention relates to a milk foaming device for use in conjunction with a beverage dispenser, the milk foaming device comprising: a mixing element including a mixing portion, a hot water / steam inlet hole, and a main flow conduit connecting the hot water / steam inlet hole to the mixing portion; a closing portion movable relative to the mixing element between a closed position and an open position, in the closed position, the closing portion closes the mixing portion and the main flow conduit, and in the open position the mixing portion and the main flow conduit are open and accessible to allow cleaning of the mixing portion and the main flow conduit; and a milk supply conduit connected to the main flow conduit. According to the present invention, the closing portion includes at least one observation window that faces the mixing portion when the closing portion is in the closed position.

[0013] Thanks to the present invention, the foaming device is simpler to use because the user only needs to look through the observation window to see whether the foaming device has been used and whether it needs to be cleaned before making a beverage. In addition, the user can check the correct operation of the foaming device through the observation window. Moreover, the user no longer needs to separate the foaming device from the beverage dispenser and / or move the closing portion to the open position to perform such an inspection. Finally, the foaming performance is improved because the user simply sees that milk protein, for example, has dried in the main flow conduit and a cleaning operation needs to be performed to optimize the foaming performance.

[0014] According to an advantageous but non-compulsory aspect of the present invention, in any technically allowable combination, such a foaming device may incorporate one or more of the following features.

[0015] According to an advantageous feature of the present invention, the mixing portion includes a liquid inlet, a liquid outlet, and a mixing chamber extending between the liquid inlet and the liquid outlet, the mixing chamber including an open upper end and an observation window that faces the open upper end when the closing portion is in the closed position.

[0016] This arrangement allows the user to observe the mixing chamber to identify whether the foaming device has been used and needs to be cleaned, and also to observe the good operation of the foaming device during its operation by looking through the observation window at the texture of the milk foam in the mixing chamber.

[0017] According to an advantageous feature of the present invention, the open upper end forms an access opening to the mixing chamber, and when the closing portion is in the closed position, the closing portion closes the access opening.

[0018] This arrangement allows for easy cleaning of the mixing chamber while ensuring that the mixing chamber is closed by the closing portion when the foaming device is in use.

[0019] According to an advantageous feature of the invention, the mixing chamber has a substantially circular cross-section perpendicular to the vertical axis, and the main flow conduit opens substantially tangentially into the mixing chamber, such that the mixing chamber is of the cyclone type.

[0020] This arrangement allows for the promotion of the mixing and homogenization of the milk foam in the mixing chamber.

[0021] According to an advantageous feature of the invention, the mixing chamber extends along the vertical axis, and the liquid inlet opens into the upper part of the mixing chamber, for example into the high point of the mixing chamber, and the liquid outlet is located in the lower part of the mixing chamber, and for example at the low point of the mixing chamber.

[0022] This arrangement allows for the promotion of the flow of the liquid in the mixing chamber and provides good performance in terms of milk foaming and the flow rate of the milk foam.

[0023] According to an advantageous feature of the invention, the milk foaming device includes a seal arranged in the engagement area between the mixing element and the closing part and extending around the periphery of the mixing part and the main flow conduit, and the closing part is adapted to be supported on the seal when the closing part is in the closed position.

[0024] This arrangement allows for ensuring the seal between the mixing element and the closing part, thus ensuring optimized foaming performance.

[0025] According to an advantageous feature of the invention, the closing part includes an air supply conduit adapted to be connected to the main flow conduit when the closing part is in the closed position, and an air flow regulating device configured to regulate the air flow flowing in the air supply conduit.

[0026] This arrangement allows for the regulation of the texture of the foam, in particular the amount of air mixed with the milk.

[0027] According to an advantageous feature of the invention, the closing part forms a substantially flat cover adapted to cover the mixing part and the main flow conduit.

[0028] This arrangement allows for obtaining a foaming device with an optimized structure and volume.

[0029] According to an advantageous feature of the invention, the foaming device includes a milk container defining an upper filling opening, and the mixing element and the closing part are adapted to cover the upper filling opening.

[0030] This arrangement allows for combining the milk storage and foaming functions in the milk tank.

[0031] According to an advantageous feature of the invention, the milk foaming device is adapted to be integrated into the beverage dispensing head of a beverage dispenser including a hot water / steam dispensing outlet, and when the foaming device is received in the beverage dispensing head, the hot water / steam inlet hole is adapted to be fluidly connected to the hot water / steam dispensing outlet.

[0032] This arrangement allows for a simplified integration of the milk foaming device into the beverage dispensing head, and in particular into the beverage dispenser.

[0033] According to an advantageous feature of the invention, the closing part is configured to be hinged to the mixing element by a hinge defining a substantially horizontal axis of rotation.

[0034] This arrangement allows for a simplified operation of the milk foaming device, and in particular of the closing part. In fact, the hinging of the closing part to the mixing element allows the closing part to remain connected to the mixing element regardless of its position, and allows for an easy movement of the closing part to the next open or closed position if the user wishes to clean or use the foaming device. In addition, the association of the foaming device with the beverage dispenser becomes easier. Finally, the foaming performance is improved because cleaning is easier, and because the closing part allows for ensuring a good seal of the main flow conduit.

[0035] According to an advantageous feature of the invention, the observation window is formed by a part of the closing part made of a transparent material.

[0036] This arrangement allows for a simplified fabrication of the observation window.

[0037] According to an advantageous feature of the invention, the access opening is arranged on the upper surface of the mixing element, the outlet is arranged on the lower surface of the mixing element, and advantageously, the main flow conduit is also arranged on the upper surface of the mixing element.

[0038] According to an advantageous feature of the invention, the main flow conduit extends along a substantially horizontal plane and includes an upper opening, also referred to as an open upper end, over at least 50% of its length, preferably over at least 70% of its length, which is adapted to be closed when the closing part is in the closed position.

[0039] According to an advantageous feature of the invention, the closing part is configured to cover the upper surface of the upper wall of the mixing element, and the closing part forms a substantially flat lid that is adapted to cover the upper surface of the upper wall, in particular the mixing part and the main flow conduit.

[0040] The invention also relates to a beverage dispenser including a hot water / steam dispensing outlet and a milk foaming device. According to the invention, the milk foaming device is as described above, and the hot water / steam inlet hole is adapted to be fluidly connected to the hot water / steam dispensing outlet.

[0041] This arrangement allows for the obtaining of a foam milk-based beverage with optimized texture and quality from a beverage dispenser.

[0042] According to an advantageous feature of the invention, the beverage dispenser includes a beverage dispensing head that includes a hot water / steam dispensing outlet and a receiving compartment for a milk foaming device, and the beverage dispensing head includes an upper facade that is provided with an observation area of an observation window when the milk foaming device is positioned in the receiving compartment.

[0043] This arrangement allows for improved user safety and facilitates the integration of the foaming device into the beverage dispenser. This particularly allows for positioning the milk dispensing outlet of the foaming device near the beverage (e.g., coffee) dispensing outlet of the beverage dispenser. Additionally, this arrangement allows for observing the interior of the mixing section through the observation area and the observation window. Description of the Drawings

[0044] The objects, aspects, and advantages of the present invention will be better understood from the following description of specific embodiments of the present invention given by way of non-limiting example with reference to the accompanying drawings, in which:

[0045] Figure 1 is a front view of a beverage dispenser that includes a beverage dispensing head for receiving a milk foaming device according to a first embodiment of the present invention.

[0046] Figure 2 is Figure 1 a perspective view of the beverage dispensing head of

[0047] Figure 3 is Figure 1 a perspective view of the beverage dispensing head of

[0048] Figure 4 is a sectional side view along the vertical cutting plane of line IV-IV of the beverage dispensing head of Figure 2

[0049] Figure 5 is Figures 1 to 4 a perspective view of the milk foaming device of

[0050] Figure 6 is similar to Figure 5 the view of

[0051] Figure 7 in which the closing part is in the open position;

[0052] Figure 8 ​Yes Figure 7 Partial perspective view of the foaming device, in which the closing part and the holding system of the closing part are omitted.

[0053] Only the elements necessary for understanding the present invention are shown. For ease of reading the drawings, the same elements carry the same reference numerals from one figure to another. Detailed description of the invention

[0054] In the remainder of this specification, foam or foaming refers to obtaining foam from a liquid, whether it is only the foam of that liquid (i.e., milk foam) or a mixture of that liquid and the foam of that liquid (i.e., a mixture of milk and milk foam).

[0055] It should be noted that, herein, the terms "horizontal", "vertical", "lower", "upper", "top", "bottom", "front", "rear", "longitudinal", "lateral" used to describe the beverage dispenser and its related elements refer to the beverage dispenser and its related elements in the usage situation when the machine is placed flat on the workbench.

[0056] Furthermore, the terms "upstream" and "downstream" or "inlet" and "outlet" are defined according to the flow direction of the beverage or steam in the beverage dispenser and in the milk foaming device.

[0057] The terms "outer" and "inner" and the terms "external" and "internal" are defined relative to the central axis of the beverage dispenser or the milk foaming device. Therefore, the inner / internal part will be closer to the central axis than the outer / external part.

[0058] Figure 1 The beverage dispenser shown is a coffee machine 10. As a variant, the beverage dispenser is a hot water or tea dispenser.

[0059] The coffee machine 10 is advantageously an automatic coffee machine.

[0060] The coffee machine 10 includes a frame 12 and a receiving area 16 for a utensil or container, and the utensil / container (not shown) is adapted to be placed on this receiving area.

[0061] The coffee machine 10 further includes a beverage dispensing head 18.

[0062] The coffee machine 10 advantageously includes a human-machine interface not visible in the figure, through which the user can select the type of beverage to be dispensed and advantageously input the adjustment parameters of the coffee machine 10.

[0063] The coffee machine 10 further includes a beverage preparation unit (not shown) integrated into the frame 12.

[0064] The preparation unit includes a control circuit for managing the production of beverages according to instructions given by the user. The preparation unit also includes a boiler for generating hot water and / or steam and a reservoir forming a cold water reserve. The reservoir allows water to be supplied to the boiler to generate hot water and / or steam.

[0065] The preparation unit also advantageously includes, in a known manner not shown, a coffee bean reservoir, an automatic coffee bean grinder, and a brewing chamber adapted to receive the ground coffee beans and be supplied with hot water by the boiler. The brewing chamber is fluidly connected to the dispensing head 18 such that the machine 10 is adapted to dispense coffee-based beverages via the beverage dispensing head 18.

[0066] The coffee machine 10 also includes a hot water / steam outlet fitting (not shown in the figures) adapted to be supplied with hot water and / or steam by the boiler. The hot water / steam outlet fitting opens near the beverage dispensing head 18 in order to supply it with hot water / steam.

[0067] In Figures 1 to 4 the embodiment, the beverage dispensing head 18 includes a hot water / steam dispensing outlet 20, visible in Figure 4 which is fluidly connected to the hot water / steam outlet fitting.

[0068] The hot water / steam outlet fitting is formed, for example, by a pipe adapted to be connected to the hot water / steam dispensing outlet 20.

[0069] The beverage dispensing head 18 also includes a beverage dispensing member 22 adapted to be fluidly connected to the brewing chamber and to dispense coffee-based beverages.

[0070] The beverage dispensing member 22 advantageously includes two beverage dispensing outlets, only one of which 36 is visible in Figure 4 such that it is adapted to simultaneously convey coffee-based beverages into two cups.

[0071] As Figure 4 shown, the beverage dispensing head 18 includes a region 24 for receiving the beverage dispensing member 22, preferably a rear region, and a region defining a receiving compartment 26 for the milk foaming device 28, preferably a front region.

[0072] The beverage dispensing head 18 is advantageously height-adjustable.

[0073] The beverage dispensing head 18 also includes a milk supply inlet 29 for the foaming device 28.

[0074] Advantageously, as Figure 3 shown, the supply inlet 29 opens onto the side of the beverage dispensing head 18. The supply inlet 29 is adapted to receive a milk supply pipe fluidly connected to a milk container which is preferably remote from the machine 10.

[0075] As Figure 2 andFigure 3 As shown, the beverage dispensing head 18 includes a body 30 that defines a receiving compartment 26 for the foaming device 28 and a receiving area 24 for the beverage dispensing member 22.

[0076] The body 30 includes an open front end 32 for accessing the receiving compartment 26.

[0077] The beverage dispensing head 18 further includes a closure body 34 for the front end 32.

[0078] In the illustrated embodiment, the closure body 34 is pivotally mounted on the body 30. The closure body 34 is adapted to move between an open position and a closed position. In the open position, the receiving compartment 26 of the foaming device 28 is accessible. In the closed position, the closure body at least partially closes the receiving compartment 26, particularly the front end 32 of the body 30.

[0079] The closure body 34 is rotatably hinged to the body 30 along a substantially horizontal longitudinal axis X. The hinge is located, for example, between the upper wall 38 of the body 30 and the upper wall 40 of the closure body 34.

[0080] In Figures 1 to 6 the example, the foaming device 28 is removable relative to the beverage dispensing head 18, particularly relative to the receiving compartment 26. In other words, the foaming device is adapted to be integrated into the beverage dispensing head 18.

[0081] As Figure 6 shown, the foaming device 28 includes a mixing element 42 that includes a mixing portion 44, a hot water / steam inlet hole 46, and a main flow conduit 48 that connects the hot water / steam inlet hole 46 to the mixing portion 44.

[0082] The foaming device 28 and particularly the mixing element 42 further include a connecting member 50 for connecting the foaming device to the hot water / steam distribution outlet 20.

[0083] The connecting member 50 leads to the rear surface 52 of the foaming device 28, particularly the mixing element 42.

[0084] When the foaming device 28 is positioned in the receiving compartment 26, the connecting member 50 is adapted to be connected to the hot water / steam distribution outlet 20 in order to be supplied with hot water / steam.

[0085] The hot water / steam inlet hole 46 is fluidly connected to the connecting member 50 in order to receive the hot water / steam conveyed by the hot water / steam distribution outlet 20 when the connecting member 50 is connected to the hot water / steam distribution outlet 20.

[0086] As a variant, the hot water / steam inlet hole 46 is adapted to be directly connected to the hot water / steam distribution outlet 20 when the foaming device 28 is positioned in the receiving compartment 26.

[0087] Typically, the hot water / steam inlet hole 46 is adapted to be fluidly connected to the hot water / steam distribution outlet 20 when the foaming device 28 is received in the beverage dispensing head 18. This connection is reversible because the connecting member is adapted to connect / disconnect the hot water / steam distribution outlet 20.

[0088] The mixing element 42 includes an upper wall 54.

[0089] The foaming device 28, in particular the mixing element 42, includes two side walls 56, 58.

[0090] The side walls 56, 58 each define a gripping area 56A, 58A by which a user grips the foaming device 28. The user of the foaming device 28 can manipulate the foaming device 28 and position it in the receiving compartment 26 by manipulating the foaming device with fingers at the gripping areas 56A, 58A.

[0091] The side walls 56, 58 are each provided with retaining / locating lugs 62, 64 for retaining / locating the foaming device 28 in the beverage dispensing head 18.

[0092] The lugs 62, 64 are adapted to cooperate with the closing body 34, which forms a retaining means for retaining the foaming device 28 in the beverage dispensing head 18, as will be explained in the following detailed description of the closing body 34 and its interaction with the foaming device 28.

[0093] The side walls 56, 58 are also each provided with guiding elements 66, 68 which are adapted to cooperate with corresponding guiding elements 70, 72 located in the beverage dispensing head 18.

[0094] The guiding elements 66, 68 are formed, for example, by ribs arranged at the side walls 56, 58.

[0095] The guiding elements 70, 72 are, for example, grooves adapted to receive the ribs corresponding to the guiding elements 66, 68 and form a sliding connection with the ribs.

[0096] The guiding elements 70, 72 are arranged in the upper part of the receiving compartment 26.

[0097] The guiding elements 66, 68 are, for example, located in front of the gripping area in the direction in which the foaming device 28 is inserted into the dispensing head 18.

[0098] Advantageously, as shown, the guiding elements 66, 68 are formed by a part of the corresponding side walls 56, 58 forming the ribs.

[0099] The lugs 62, 64 advantageously project relative to the guide elements 66, 68 along the longitudinal axis X, and more generally relative to the other elements forming the side walls 56, 58. In other words, they extend along the longitudinal axis X beyond the guide elements 66, 68 towards the outside of the foaming device 28.

[0100] As Figure 4 and Figure 6 As can be seen, the mixing section 44 includes a liquid inlet 74, a liquid outlet 76, and a mixing chamber 78 extending between the liquid inlet 74 and the liquid outlet 76.

[0101] The mixing chamber 78 extends along the vertical axis Z.

[0102] The mixing chamber 78 includes an open upper end 80. The open upper end 80 forms an access opening for accessing the mixing chamber 78.

[0103] The mixing chamber 78 opens into the upper surface of the upper wall 54 of the mixing element 42.

[0104] The mixing chamber 78 has a substantially circular cross-section perpendicular to the vertical axis Z.

[0105] The liquid inlet 74 opens into the upper part of the mixing chamber 78, for example into the high point of the mixing chamber 78, the liquid outlet 76 is located in the lower part of the mixing chamber 78, and for example at the low point of the mixing chamber 78.

[0106] The open upper end 80 is arranged on the upper surface of the mixing element 42, and thus on the upper surface of the upper wall 54.

[0107] The liquid outlet 76 is provided on the lower surface of the mixing element 42.

[0108] The main flow pipe 48 is provided in the upper surface of the upper wall 54 and opens into the mixing chamber 78 at the liquid inlet 74.

[0109] The main flow pipe 48 opens into the mixing chamber 78 substantially tangentially, such that the mixing chamber 78 is of the cyclone type. Thus, the liquid flowing from the main flow pipe 48 into the mixing chamber 78 passes through the mixing chamber by swirling along the walls of the mixing chamber 78.

[0110] As Figure 6 As shown, the main flow pipe 48 includes, for example, a cross-section restriction 84 located in the central part of the main flow pipe 48. The main flow pipe 48 particularly includes a first pipe section 48.1 located upstream of the cross-section restriction 84 and extending to the cross-section restriction, and a second pipe section 48.2 located downstream of the cross-section restriction 84 and extending from the cross-section restriction 84 to the mixing chamber 78. Advantageously, the first pipe section 48.1 has a passage cross-section that decreases in the direction of the cross-section restriction 84, and the second pipe section 48.2 has a passage cross-section that increases in the direction of the mixing chamber 78.

[0111] The hot water / steam inlet hole 46 leads to the first pipe section 48.1, more specifically, opposite to the mixing chamber 78. Thus, the main flow pipe 48 is configured to fluidly connect the hot water / steam inlet hole 46 to the mixing chamber 78 and allow the hot water / steam to flow in the main flow pipe 48 to the mixing chamber 78.

[0112] The foaming device 28 includes a milk supply pipe 90 connected to the main flow pipe 48. When the foaming device 28 is positioned in the receiving compartment 26, the milk supply pipe 90 extends between the main flow pipe 48 and the milk supply inlet 29.

[0113] The milk supply pipe 90 is adapted to be fluidly connected to a remote milk reservoir separated from the milk foaming device 28.

[0114] The milk supply pipe 90 is fluidly connected to the main flow pipe 48 and is thus configured to be fluidly connected to the mixing chamber 78 via the main flow pipe 48. According to the embodiment shown in the figure, the mixing element 42 includes the milk supply pipe 90, more specifically, the mixing element and the milk supply pipe are made in one piece.

[0115] The milk supply pipe 90 includes a substantially vertical portion that preferably extends from near the lower surface of the mixing element 42 and leads into the main flow pipe 48 at the cross-sectional restriction 84. When the foaming device 28 is positioned in the receiving compartment 26, the lower end of the vertical portion is adapted to be fluidly connected to the milk supply inlet 29.

[0116] In the figure, only the portion of the milk supply pipe 90 that leads into the main flow pipe 48 can be seen.

[0117] The foaming device 28 further includes an air introduction passage 92 for introducing air into the main flow pipe 48. According to the embodiment shown, the mixing element 42 includes the air introduction passage 92.

[0118] Advantageously, the air introduction passage 92 is provided in the upper surface of the upper wall 54 of the mixing element 42.

[0119] The air introduction passage 92 leads into the main flow pipe 48 at the cross-sectional restriction 84. Thus, the air introduction passage 92 is configured to be fluidly connected to the mixing chamber 78 via the main flow pipe 48.

[0120] As previously described, the cross-sectional restriction 84 causes an increase in the velocity of the steam flowing in the main flow conduit 48, which creates a negative pressure in the milk supply conduit 90 and the air introduction passage 92. Accordingly, the cross-sectional restriction 84 is more particularly configured to form a milk and air suction system based on the Venturi effect. Thus, the main flow conduit 48 is configured such that the hot water / steam flow in the main flow conduit from the hot water / steam inlet hole 46 to the mixing chamber 78 creates a negative pressure in the milk supply conduit 90 and a negative pressure in the air introduction passage 92, and thus causes milk and air to be sucked into the main flow conduit 48, and the sucked milk and air flow to the mixing chamber 78.

[0121] In addition, the second conduit portion 48.2 has an increasing passage cross-section in the direction towards the mixing chamber 78, which promotes a first mixing of the steam, milk, and air respectively from the hot water / steam inlet hole 46, the milk supply conduit 90, and the air introduction passage 92 before reaching the mixing chamber 78.

[0122] In addition, due to the positioning of the main flow conduit 48 relative to the mixing chamber 78, the first mixture of steam, milk, and air undergoes a swirling motion when reaching the mixing chamber and swirls along the walls of the mixing chamber 78, which further promotes mixing and obtains milk foam with an optimal consistency. Thus, the mixing chamber 78 allows for the homogenization of the above-mentioned first mixture and completes the mixing that starts in the second conduit portion 48.2.

[0123] The main flow conduit 48, as well as the hot water / steam inlet hole 46, the air introduction passage 92, and the mixing chamber 78 advantageously include open upper ends. In other words, they form a liquid flow passage that opens outwards at their upper parts.

[0124] The foaming device 28 includes a closing part 96 that is movable relative to the mixing element 42 between a closed position and an open position. In the closed position, the closing part 96 closes the mixing part 44 and the main flow conduit 48. In the open position, the mixing part 44 and the main flow conduit 48 are open and accessible to allow cleaning of the mixing part 44 and the main flow conduit 48.

[0125] In the closed position, the closing part 96 particularly closes the open upper ends of the hot water / steam inlet hole 46, the main flow conduit 48, and the mixing chamber 78.

[0126] Advantageously, in the closed position, the closing part 96 also at least partially closes the air introduction passage 92, particularly the open upper end of the air introduction passage.

[0127] Advantageously, the main flow conduit 48 extends along a substantially horizontal plane and includes an upper opening, also referred to as an open upper end, over at least 50% of its length, preferably over at least 70% of its length, which is adapted to be closed when the closing part 96 is in the closed position.

[0128] The closing part 96 is configured to cover the upper surface of the upper wall 54 of the mixing element 42. The closing part 96 forms a substantially flat cover that is adapted to cover the upper surface of the upper wall 54, in particular the mixing part 44 and the main flow duct 48.

[0129] The closing part 96 is configured to be hinged to the mixing element 42 via a hinge that defines a substantially horizontal axis of rotation Y. The axis of rotation Y is advantageously perpendicular to the longitudinal axis X when the foaming device is positioned in the receiving compartment 26. In a variant (not shown), the axis of rotation Y is parallel to the longitudinal axis X.

[0130] The hinge allows for simplified operation of the foaming device by holding the closing part 96 on the mixing element 42 regardless of the position of the closing part. In addition, if the user wishes to clean or use the foaming device, the hinge allows the closing part to be easily moved to the next open or closed position.

[0131] Advantageously, the side walls 56, 58 of the foaming device, including the side wall of the closing part 96 and the side wall of the mixing element 42, form guiding elements 66, 68 when the closing part 96 is in the closed position. This arrangement allows for ensuring the closing of the foaming device 28, i.e., the closing of the closing part 96, when the foaming device 28 is inserted into the receiving compartment 26 and the guiding elements 66, 68 interact with the corresponding guiding elements 70, 72. In addition, this arrangement allows for ensuring that the closing part 96 remains in the closed position when the foaming device 28 is received in the receiving compartment 26, since the guiding elements 70, 72 extend along a substantially vertical direction on either side of the corresponding guiding elements 66, 68 and ensure that the side wall of the closing part 96 remains in contact / adjacent to the side wall of the mixing element 42.

[0132] In other words, each guiding element 70, 72 is adapted to hold the closing part 96 of the foaming device in the closed position, i.e., in contact with the mixing element 42 when the foaming device 28 is inserted into the receiving compartment 26.

[0133] In a variant (not shown), the foaming device 28 includes a holding system (not shown) that is configured to hold the closing part 96 in the closed position. The holding system is formed, for example, by a locking member, such as a locking clip integral with the closing part, and is adapted to be held in a corresponding groove formed in the mixing element 42, in particular in its wall / upper surface 54, by form-fitting when the closing part is in the closed position. The holding system is adapted to move between a locked position and an unlocked position of the closing part 96 in the closed position.

[0134] The closing part 96 includes an observation window 97, as Figure 5 shown, when the closing part 96 is in the closed position, the observation window 97 faces the mixing part 44, in particular the mixing chamber 78.

[0135] When the closing part 96 is in the closed position, the viewing window 97 faces the open upper end 80.

[0136] The viewing window 97 is formed, for example, as part of a closing part made of a transparent material such that when the closing part 96 is in the closed position, the user can observe the interior of the mixing chamber 78.

[0137] The viewing window 97 allows the user to observe whether the foaming device 28 has been used and whether it needs to be cleaned before making a beverage. In fact, the user can observe the interior of the mixing chamber 78 through this window. Additionally, the user can check the correct operation of the foaming device 28 by visually inspecting whether the milk passes through the mixing chamber 78 and indeed has a swirling motion along the walls of the chamber 78 through the viewing window.

[0138] The closing part 96 further includes an air supply duct 98, as Figure 6 shown, the air supply duct being adapted to be fluidly connected to the main flow duct 48 when the closing part 96 is in the closed position, and an air flow regulating device 99 configured to regulate the air flow flowing into the main flow duct 48 in the air supply duct 98. When the closing part 96 is in the closed position, the air supply duct 98 is advantageously connected to the air introduction channel 92 so as to be fluidly connected to the main flow duct 48.

[0139] The air supply duct 98 is, for example, a hole passing through the closing part 96 along the vertical axis Z when the closing part 96 is in the closed position.

[0140] According to the embodiment shown in the figure and as Figure 4 more clearly visible in, the air flow regulating device 99 includes a support part 100 fixed to the closing part 96 and protruding from the upper surface of the closing part 96. The air flow regulating device 99 further includes an air flow regulating member 102, such as a flow regulating button, which is supported by the support part 100 and is movably mounted, and is, for example, movably mounted relative to the support part 100 along a movement direction D2 in a helical motion, and the movement direction D2 can be, for example, substantially vertical.

[0141] The flow regulating member 102 is configured to occupy a plurality of regulating positions offset from each other along the movement direction D2.

[0142] The air flow regulating device 99 further includes a sealing element 104, which is fixed to the flow regulating member 102 and is configured to define an air flow passage with the support part 100, and the air flow passage has a passage cross-section that varies according to the position occupied by the flow regulating member 102.

[0143] The flow rate regulating member 102 can more particularly move between a maximum regulating position where the passage cross-section of the air flow passage is the largest and a minimum regulating position where the passage cross-section of the air flow passage is the smallest (e.g., zero or substantially zero).

[0144] According to the embodiment shown in the figures, the support part 100 includes an insertion hole 106 which, for example, may have a diameter greater than 1 mm and preferably greater than 1.5 mm, is oriented substantially parallel to the movement direction D2, and the air flow rate regulating device 99 includes a passage restricting member not visible in the figures, such as a generally cylindrical pin or needle having a lower end portion received in the insertion hole 106. The passage restricting member is integrally movable with the flow rate regulating member 102 and is thus mounted to be movable in the insertion hole 106 along the movement direction D2. The insertion hole 106 and the passage restricting member more specifically define a calibrated air passage that is fluidly connected to the air supply pipe 98.

[0145] The air flow rate regulating device 99 allows the regulation of the air flow rate injected into the main flow pipe 48, thereby regulating the size of the bubbles contained in the milk foam at the outlet of the foaming device 28. By changing the size of the bubbles, the volume of the milk foam is changed.

[0146] According to a variant embodiment of the present invention, the mixing element 42 may not have an air introduction passage 92, and when the closing part 96 is in the closed position, the air supply pipe 98 may be directly connected to the main flow pipe 48.

[0147] The milk foaming device 28 includes a seal 110, as Figure 6 shown, which is arranged in the joint area between the mixing element 42 and the closing part 96. The seal 110 extends around the mixing part 44 and the periphery of the main flow pipe 48.

[0148] The closing part 96 is adapted to ensure support on the seal 110 when the closing part 96 is in the closed position.

[0149] As Figure 6 more specifically shown, the seal 110 extends around the mixing chamber 78, particularly around the open upper end 80, the main flow pipe 48, the air introduction passage 92, and the hot water / steam inlet hole 46. For this purpose, the mixing element 42 includes a receiving groove 112 provided in the upper surface of the upper wall 54, and the seal 110 is received in the receiving groove 112.

[0150] According to the embodiment shown in the figures, the seal 110 includes a sealing body integrally received in the receiving groove 112 and a sealing lip extending along the sealing body and protruding from the receiving groove 112. Advantageously, the seal 110 is continuous and may, for example, have a constant cross-section.

[0151] Closing part 96 allows the use of a seal 110 to ensure sealing at the upper wall 54, the main flow pipe 48, and the hot water / steam inlet hole 46, the air introduction channel 92, and the mixing chamber 78. Thus, the optimized performance of the foaming device 28 is ensured.

[0152] The milk foaming device 28 further includes a foamed milk dispensing element 114 adapted to be reversibly connected to the mixing element 42.

[0153] The foamed milk dispensing element 114 advantageously includes an inlet channel 116 for foamed milk and two outlet channels 118, 120.

[0154] The foamed milk dispensing element 114, in particular the inlet channel 116, is adapted to be fluidly connected to the liquid outlet 76 when connected to the mixing element 42.

[0155] The foamed milk dispensing element 114 is adapted to simultaneously deliver foamed milk to two cups via the two outlet channels 118, 120.

[0156] In the illustrated embodiment, the closing body 34 forms a holding device for holding the foaming device 28 in the receiving compartment 26.

[0157] The holding device takes the form of a holding rod 130 that is movable between an open position and a closed position. In the open position, the receiving compartment is accessible, and in the closed position, the holding rod 130 is adapted to cooperate with the milk foaming device 28 to hold it in the receiving compartment 26.

[0158] When the holding rod 130 is in the open position, the user can access the compartment 26, in particular the foaming device 28, in order to remove it from the compartment 26 and perform operations such as cleaning the foaming device.

[0159] When the holding rod 130 is in the closed position and the foaming device 28 is received in the compartment 26, the holding rod 130 is adapted to cooperate with the milk foaming device 28 to hold it in the receiving compartment 26.

[0160] The holding rod 130 is mounted to pivot relative to the receiving compartment along the longitudinal axis X.

[0161] As shown, the open position of the holding rod 130 corresponds to a high position, and the closed position corresponds to a low position.

[0162] The holding rod 130 particularly includes axial protrusions 132, 134 that are adapted to abut against the foaming device 28 when the holding rod 130 moves from the open position to the closed position and the foaming device 28 is positioned in the receiving compartment 26.

[0163] The axial protrusions 132, 134 extend from the lower surface of the upper wall 40.

[0164] The axial protrusions 132, 134 extend in a substantially vertical plane.

[0165] Each of the axial protrusions 132, 134 is adapted to cooperate with the respective lugs 62, 64 when the foaming device 28 is improperly positioned in the receiving compartment 26 to prevent the retaining lever from moving to the closed position. The lugs 62, 64 form anti-misalignment elements that allow ensuring the correct positioning of the foaming device 28 in the receiving compartment 26.

[0166] Advantageously, each of the axial protrusions 132, 134 includes a relief adapted to cooperate with the respective lugs 62, 64, such as a hook-shaped relief.

[0167] In fact, if the foaming device 28 is poorly positioned, in particular not fully inserted into the receiving compartment 26 along the insertion direction, the lugs are adapted to cooperate with the axial protrusions and advantageously with the reliefs to prevent the retaining lever 130 from moving to the closed position. Thus, the user realizes that the foaming device 28 is not fully inserted into the receiving compartment 26 and can correct its positioning.

[0168] Advantageously, each of the axial protrusions 132, 134 and advantageously each relief is adapted to cooperate with the respective lugs 62, 64 when the foaming device 28 is correctly positioned in the receiving compartment 26 and the retaining lever 130 is moved to the closed position. More precisely, each relief is adapted to exert an axial force on the respective lugs 62, 64 when the foaming device 28 is correctly positioned in the receiving compartment 26 and the retaining lever 130 is moved to the closed position.

[0169] The axial force is exerted along the direction in which the foaming device 28 is inserted into the receiving compartment 26 to ensure the correct positioning of the foaming device 28 in the beverage dispensing head 18 and to ensure that the connecting member 50 is connected to the hot water / steam dispensing outlet 20.

[0170] The axial protrusions 132, 134 allow ensuring the cooperation of the connecting member 50 with the hot water / steam dispensing outlet 20 and the connection of the milk supply pipe 90 to the milk supply inlet 29 by means of the axial force, thus ensuring the correct operation of the foaming device 28.

[0171] The axial protrusions 132, 134 are arranged on either side of the central axis of the beverage dispensing head 18. The central axis is a vertical axis.

[0172] As a variant, the retaining lever 130 includes a single axial protrusion.

[0173] The retaining lever 130 further includes a front surface that is provided with a gripping area 135 for gripping by the user to manipulate the retaining lever 130 between its open and closed positions.

[0174] Advantageously, the beverage dispensing head 18 includes an upper face equipped with a through - hole 136 for the air flow regulating member 102. Advantageously, the through - hole 136 is formed through the upper wall 38 of the body 30.

[0175] Advantageously, the beverage dispensing head 18 includes an upper face, such as the upper wall 40, which is equipped with an observation area 138 for the mixing portion 44 of the foaming device 28. The observation area 138 is formed, for example, by a hole provided through the upper wall 40 of the closing body 34. As a variant, the observation area 138 is a transparent area provided in the upper wall 40.

[0176] The observation area 138 is arranged to face the observation window 97 when the holding lever 130 and / or the closing body 34 is in the closed position and the foaming device 28 is received in the receiving compartment 26. The observation area 138 allows the mixing chamber 78 to be observed through the observation window 97. Thus, the user can observe the mixing chamber 78 and the foamed milk flowing through the foaming chamber. This allows the user to visually check whether the foaming device 28 needs to be cleaned and the proper operation of the foaming device 28 by examining the swirling motion of the milk and advantageously examining the texture of the milk.

[0177] The closing body 34 also forms a support device on the closing portion 96 of the foaming device 28.

[0178] The support device is adapted to apply a support force on the closing portion 96 when the foaming device 28 is positioned in the receiving compartment 26 to ensure a seal between the mixing element 42 and the closing portion 96.

[0179] The support device also allows a constant distance to be maintained between the closing portion 96 and the upper wall 54 when the closing portion 96 is in the closed position. Thus, when the foaming device 28 is used, the dimensions of the main flow pipe 48 and the air introduction channel 92 are maintained over time, and the foaming performance is optimized and ensured over time. The support device ensures that the closing portion 96 is well - pressed against the mixing element 42 to ensure the dimensions of the pipe 48 and the channel 92 and to avoid possible deformation of the closing portion 96.

[0180] The support device is formed by the holding lever 130, which is pivotally mounted relative to the receiving compartment 26 and is adapted to move between an open position in which the receiving compartment 26 is accessible and a closed position in which the support device applies a support force on the closing portion 96 to ensure that the closing portion 96 abuts against the mixing element 42. The holding lever 130 is particularly adapted to press the closing portion 96 against the seal 110.

[0181] The support force extends particularly along a substantially vertical direction.

[0182] The retaining lever 130 particularly includes upper ribs 140 disposed on the lower surface of the upper wall 40, preferably two upper ribs 140, 142.

[0183] The ribs 140, 142 extend from the lower surface of the upper wall 40.

[0184] The ribs 140, 142 are adapted to abut against the foaming device 28 when the retaining lever 130 moves from the open position to the closed position while the foaming device 28 is located in the receiving compartment 26.

[0185] The ribs 140, 142 are adapted to exert a supporting force on the closing part 96 to ensure a good seal between the mixing element 42 and the closing part 96.

[0186] Advantageously, the retaining lever further includes two additional ribs 144, 146 located on the inner wall of the front facade of the lever 130. The additional ribs 144, 146 preferably extend along the longitudinal axis X. The additional ribs 144, 146 are adapted to abut against the foamed milk dispensing element 114 when the retaining lever 130 moves from the open position to the closed position while the foaming device 28 is positioned in the receiving compartment 26.

[0187] As a variant, the closing body is the front covering cap of the beverage dispensing head, which is adapted to close the receiving compartment 26, in particular the front end 32 of the body 30. In this variant, the beverage dispensing head 18 includes a retaining lever 130 hinged to the body 30 and separated from the closing body. The retaining lever 130 is movable between an open position where the receiving compartment is accessible and a closed position where the receiving compartment is partially closed. In this variant, the retaining lever is positioned between the body 30 and the closing body and has substantially similar features to the embodiment shown in the figure, except that it does not function as the covering cap of the dispensing head 18.

[0188] As a variant, the closing part 96 includes a substantially horizontal first part and a substantially vertical part. The substantially horizontal first part forms a cover that is adapted to close the access opening 80 and the main flow conduit 48 when the closing part is in the closed position. The substantially vertical part forms a mixing chamber 78 with the mixing element 42 and advantageously forms the foamed milk dispensing element 114 when the closing part 96 is in the closed position.

[0189] The additional ribs 144, 146 are adapted to exert a supporting force on the mixing chamber 78 and the foamed milk dispensing element 114 respectively. The supporting force is exerted along a substantially horizontal direction. The additional ribs 144, 146 are particularly useful in the above variant to ensure the sealing of the mixing chamber and the foamed milk dispensing element 114.

[0190] In Figures 7 to 8 the embodiment of, the foaming device 228 complies with the second embodiment of the present invention.

[0191] In the following description, reference will be made toFigure 7 and Figure 8 Describe the foaming device 228 according to the second embodiment, and similar elements of the second embodiment will carry reference numerals that are the same as those in the first embodiment but increased by 200. Only the differences of the second embodiment relative to the first embodiment will be described.

[0192] The foaming device 228 forms a milk jug adapted to be connected to the hot water / steam nozzle of a coffee machine.

[0193] The foaming device 228 includes a milk reservoir 233 that defines an internal volume for containing milk and includes an upper filling opening 237.

[0194] The foaming device 228 includes a connecting end piece 239 that is configured to be connected to the hot water / steam outlet end piece (not shown) of a coffee machine. For example, the hot water steam outlet end piece is connected to the hot water / steam nozzle of the coffee machine. Advantageously, the connecting end piece 239 extends radially with respect to the central axis X233 of the milk reservoir 233.

[0195] The foaming device 228 includes a mixing element 242 that includes a mixing portion 244, a hot water / steam inlet hole 246, and a main flow pipe 248 that connects the hot water / steam inlet hole 246 to the mixing portion 244.

[0196] In a manner similar to the first embodiment, the mixing portion 244 includes a liquid inlet, a liquid outlet, and a mixing chamber 278 that extends between the liquid inlet and the liquid outlet.

[0197] The mixing chamber 278 includes an open upper end 280.

[0198] The foaming device 228 further includes a milk supply pipe 290 that is connected to the main flow pipe 248.

[0199] The mixing element further includes an air introduction channel 292.

[0200] The mixing element 242 is adapted to cover the upper filling opening 237.

[0201] The mixing element 242 further includes a receiving groove 312 in which a seal (not shown) is received.

[0202] The mixing element 242 is provided with a generally flat upper surface.

[0203] The mixing element 242 is configured to partially close the milk reservoir 233 and is removable relative to the milk reservoir 233. The mixing element 242 includes, for example, a tubular mounting portion 241 that is configured to be mounted in the milk reservoir 233, more specifically inserted into the milk reservoir 233 through the upper opening 237 of the milk reservoir 233.

[0204] The mixing element 242 further includes a milk discharge conduit 243 which is fluidly connected to the liquid outlet of the mixing chamber 278 and is configured to allow hot milk and milk foam to be discharged into a container, such as a cup vertically arranged below the milk discharge conduit 243. Advantageously, the milk discharge conduit 243 is configured to extend radially with respect to the central axis of the milk reservoir 233.

[0205] Advantageously, the milk foaming device 228 includes fixing means which are configured to prevent the mixing element 242 from rotating relative to the milk reservoir 233 when the tubular mounting portion 241 is received in the milk reservoir 233. The fixing means may for example include fixing ribs 245 provided on the upper peripheral edge of the milk reservoir 233 and distributed around the central axis of the milk reservoir 233, and fixing grooves 247 provided on the mixing element 242 and configured to cooperate with the fixing ribs 245 respectively.

[0206] The foaming device 228 includes a closing portion 296 which is movable relative to the mixing element 242 between Figure 7 the shown closed position and open position. In the closed position, the closing portion 296 closes the mixing portion 244 and the main flow conduit 248. In the open position, the mixing portion 244 and the main flow conduit 248 are open and accessible to allow them to be cleaned.

[0207] Advantageously, in the closed position, the closing portion 296 also at least partially closes the air introduction channel 292.

[0208] The closing portion 296 includes an observation window 297 which, as Figure 7 shown, faces the mixing portion 244, particularly the open upper end 280 of the mixing chamber 278, when the closing portion 296 is in the closed position.

[0209] The mixing element 242 and the closing portion 296 are configured to close the milk reservoir 233 and are removable relative to the milk reservoir 233. Thus, the mixing element 242 and the closing portion 296 form a lid configured to close the milk reservoir 233.

[0210] According to Figure 7 and Figure 8In the illustrated embodiment, the closing part 296 includes a filling opening configured to oppose a channel opening 324 provided on the mixing element 242 and leading to the milk reservoir 233, and a movable flap 326 pivotally mounted, for example, between an open position and a closed position. In the open position, the flap 326 at least partially releases the filling opening and allows milk to be introduced into the milk reservoir 233. In the closed position, the flap 326 at least partially closes the filling opening. The channel opening is defined by a cutout 324a formed through the mixing element 242.

[0211] As Figure 7 more specifically shown, the closing part 296 further includes an air flow regulating device 299 configured to regulate the air flow flowing in the air supply conduit, particularly in the air introduction channel 292.

[0212] The air flow regulating device 299 includes a flow regulating member 302, such as a flow regulating button. The flow regulating member 302 includes an adjusting portion and a manipulation portion 327, the manipulation portion being integral with the adjusting portion and configured to be manipulated by a user to move the flow regulating member 302 along a moving direction D2.

[0213] Advantageously, the milk foaming device 228 further includes a holding system 328 configured to hold the closing part 296 in the closed position and ensure compression of the seal when the closing part 296 is in the closed position. The holding system 328 is more specifically configured to press the closing part 296 against the upper surface of the mixing element 242 when the closing part 296 is in the closed position, thereby compressing the seal. According to the illustrated embodiment, the holding system 328 is further configured to removably, i.e., temporarily and reversibly, fix the mixing element 242 and the closing part 296 to the milk reservoir 233.

[0214] The holding system 328 includes a locking part 331, such as a locking ring, pivotally mounted relative to the closing part 296 about a rotation axis and between a release position and a locking position. In the release position, the locking part 331 allows the closing part 296 to move towards the open position. In the locking position, the locking part 331 prevents the closing part 296 from moving towards the open position. When the mixing element 242 is received in the milk reservoir 233 and the closing part 296 occupies the closed position, the rotation axis is advantageously substantially parallel to the central axis X233 of the milk reservoir 233 and, for example, collinear with the central axis X233 of the milk reservoir 233.

[0215] When the locking part 296 moves from the release position to the locking position, the locking part drives the closing part 296 to move axially in a vertical direction perpendicular to the central axis 233 to ensure compression of the seal and hold the closing part 296 in the closed position.

[0216] The retaining system 328 further includes a plurality of fixing members provided on the locking part 331 and distributed around the rotation axis, such as fastening ramps or fastening grooves, and a plurality of fixing elements 337 provided on the milk reservoir 233 and distributed around the central axis of the milk reservoir 233, such as fixing lugs or fixing notches. The fixing elements 337 are configured to cooperate with the fixing members provided on the locking part 331 respectively when the locking part 331 rotates from the release position to the locking position, so as to move the locking part 331 in the direction of the mixing element 242. The fixing members and the fixing elements 337 can form, for example, a bayonet fixing system or a screw-nut type fixing system.

[0217] Of course, the present invention is in no way limited to the embodiments described and shown, which are given only by way of example. Modifications are still possible without departing from the scope of protection of the present invention, in particular from the perspective of the constitution of the various elements or by the substitution of technical equivalents.

Claims

1. A milk foaming device (28, 228) cooperating with a beverage dispenser (10), the milk foaming device (28, 228) comprising: - A mixing element (42, 232), which includes: + A mixing portion (44, 244); + A hot water / steam inlet hole (46, 246) and a main flow pipeline (48, 248) connecting the hot water / steam inlet hole (46, 246) to the mixing portion (44, 244); - A closing portion (96, 296), which is movable relative to the mixing element (42, 242) between a closed position and an open position. In the closed position, the closing portion (96, 296) closes the mixing portion (44, 244) and the main flow pipeline (48, 248). In the open position, the mixing portion (44, 244) and the main flow pipeline (48, 248) are open and accessible to allow cleaning of the mixing portion (44, 244) and the main flow pipeline (48, 248), and - A milk supply pipeline (90, 290) connected to the main flow pipeline (48), characterized in that the closing portion (96, 296) includes at least one observation window (97, 297), and when the closing portion (96, 296) is in the closed position, the observation window faces the mixing portion (44, 244).

2. The milk foaming device (28, 228) according to claim 1, characterized in that, The mixing portion (44, 244) includes a liquid inlet (74), a liquid outlet (76), and a mixing chamber (78, 278) extending between the liquid inlet (74) and the liquid outlet (76). The mixing chamber (78, 278) includes an open upper end (80, 280) and an observation window (97, 297), and when the closing portion (96, 296) is in the closed position, the observation window faces the open upper end (80, 280).

3. The milk foaming device (28, 228) according to the previous claim, characterized in that, The open upper end (80, 280) forms an access opening of the mixing chamber (78, 278), and when the closing portion is in the closed position, the closing portion (96, 296) closes the access opening.

4. The milk foaming device (28, 228) according to claim 2 or 3, characterized in that, The mixing chamber (78, 278) has a substantially circular cross-section perpendicular to the vertical axis, and the main flow pipeline (48, 248) substantially tangentially leads into the mixing chamber (78, 278), so that the mixing chamber is of a cyclone type.

5. The milk foaming device (28, 228) according to any one of claims 2 to 4, characterized in that, The mixing chamber (78, 278) extends along the vertical axis, and the liquid inlet (74) leads into the upper part of the mixing chamber (78, 278), and for example, leads into the high point of the mixing chamber, and the liquid outlet (76) is located in the lower part of the mixing chamber (78, 278), and for example, is located in the low point of the mixing chamber.

6. The milk foaming device (28, 228) according to any one of the preceding claims, characterized in that, The milk foaming device (28, 228) includes a seal (110) arranged in the engagement area between the mixing element (42, 242) and the closing part (96, 296), and extending around the mixing part (44, 244) and the main flow pipe (48, 248). The closing part (96, 296) is adapted to provide support to the seal (110) when the closing part (96, 296) is in the closed position.

7. The milk foaming device (28, 228) according to any one of the preceding claims, characterized in that, The closing part (96, 296) includes an air supply pipe (98) adapted to be connected to the main flow pipe (48) when the closing part (96, 296) is in the closed position, and an air flow regulating device (99, 299) configured to regulate the air flow flowing in the air supply pipe.

8. The milk foaming device (28, 228) according to any one of the preceding claims, characterized in that The closing part (96, 296) forms a substantially flat cover adapted to cover the mixing part (44, 244) and the main flow pipe (48, 248).

9. The milk foaming device (228) according to any one of the preceding claims, characterized in that, The foaming device (228) includes a milk container (233) defining an upper filling opening (237), and the mixing element (242) and the closing part (296) are adapted to cover the upper filling opening (237).

10. The milk foaming device (28) according to any one of claims 1 to 8, characterized in that, The milk foaming device (28) is adapted to be integrated into a beverage dispensing head (18) of a beverage dispenser (10). The beverage dispenser includes a hot water / steam dispensing outlet (20), and the hot water / steam inlet hole (46) is adapted to be fluidly connected to the hot water / steam dispensing outlet (20) when the foaming device (28) is received in the beverage dispensing head (18).

11. The milk foaming device (28) according to any one of the preceding claims, characterized in that, The closing part (96) is configured to be hinged to the mixing element (42) by a hinge defining a substantially horizontal axis of rotation.

12. The milk foaming device (28) according to any one of the preceding claims, characterized in that, The observation window (97, 297) is formed by a part of the closing part (96, 296) made of transparent material.

13. A beverage dispenser (10) comprising a hot water / steam dispensing outlet (20) and a milk foaming device (28, 228), characterized in that, The milk foaming device (28, 228) is as described in any one of the preceding claims, and the hot water / steam inlet holes (46, 246) are adapted to be fluidly connected to the hot water / steam dispensing outlet (20).

14. The beverage dispenser (10) according to the previous claim, characterized in that, The beverage dispenser (10) includes a beverage dispensing head (18) that includes a hot water / steam dispensing outlet (20) and a receiving compartment (26) for the milk foaming device, and the beverage dispensing head (18) includes an upper facade equipped with an observation area (138) of the observation window (97) when the milk foaming device (28) is positioned in the receiving compartment (26).

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