Milk foaming system for preparing hot and cold milk foam

Abstract

The milk frothing system of the invention comprises a hot and a cold milk frothing device each comprising a mixing portion (6) comprising a main flow conduit (23) equipped with a first conduit portion (25) and a second conduit portion (26) disposed on either side of a cross section limiter (24) and a water supply conduit and a milk supply conduit each opening into the main flow conduit (23). The milk outlet aperture (35) of the cold milk frothing device (2') has a passage cross section different from the passage cross section of the milk outlet aperture of the hot milk frothing device (2) and the downstream end of the first conduit portion (25) of the cold milk frothing device (2') has a passage cross section different from the passage cross section of the downstream end of the first conduit portion (25) of the hot milk frothing device (2).

Description

Technical Field

[0001] This invention relates to the field of beverage dispensing equipment, and more particularly to the field of milk frothing devices for use in conjunction with coffee machines. Background Technology

[0002] Document FR3136356 discloses a milk foaming device, comprising: - A mixing portion, the mixing portion comprising: o A main flow conduit, the main flow conduit comprising: a cross-sectional constraint; a first conduit portion located upstream of the cross-sectional constraint and extending to the cross-sectional constraint; and a second conduit portion located downstream of the cross-sectional constraint and extending from the cross-sectional constraint; o A mixing chamber, which is fluidly connected to the main flow conduit and is equipped with an outlet orifice; - A closing section, which moves relative to the mixing section between a closed position and an open position, wherein in the closed position the closing section closes the mixing chamber and the main flow conduit, and in the open position the mixing chamber and the main flow conduit are open and accessible for cleaning; - A water supply conduit, the water supply conduit including a water outlet orifice leading to the first conduit portion; - A milk supply conduit, the milk supply conduit including a milk outlet orifice leading to the main flow conduit; and - An air supply duct that is fluidly connected to the main flow duct.

[0003] More specifically, the main flow conduit is configured such that the flow of liquid, especially water and especially water vapor, from the water outlet to the mixing chamber in the main flow conduit creates negative pressure in the milk supply conduit and negative pressure in the air supply conduit, causing milk and air to be drawn into the main flow conduit.

[0004] The specific construction of the milk frothing device described in document FR3136356, and more specifically the specific construction of the mixing and shut-off sections, allows for easy cleaning of the milk frothing device.

[0005] The milk foam produced using the above-mentioned milk foaming device has a high temperature, for example, about 50°C to 60°C, making the milk foaming device unsuitable for preparing cold beverages.

[0006] To allow users to prepare either cold beverages based on cold milk foam or hot beverages based on hot milk foam as desired, it is known to equip beverage dispensing equipment with a hot milk foaming device and a cold milk foaming device, each of which can be connected to a hot water / steam outlet end of the beverage dispensing equipment.

[0007] In order to produce the best hot milk foam or the best cold milk foam using this beverage dispensing equipment, it is necessary to adapt the heat regulation of the boiler of the beverage dispensing equipment according to the selected formula. This is to ensure that the temperature of the milk foam produced by the cold milk foaming device is not too high and the temperature of the milk foam produced by the hot milk foaming device is not too low.

[0008] Therefore, the beverage dispensing equipment includes a detection device capable of automatically detecting milk frothing devices (in hot and cold milk frothing devices) connected to the beverage dispensing equipment, and a control unit equipped with the beverage dispensing equipment is capable of automatically adjusting the heat regulation of the boiler equipped with the beverage dispensing equipment based on the detected milk frothing devices.

[0009] However, the complexity and manufacturing cost of such beverage dispensing equipment are high. Summary of the Invention

[0010] The present invention aims to overcome all or part of these disadvantages.

[0011] The technical problem upon which this invention is based is particularly to provide a milk foaming system that allows the preparation of beverages based on cold milk foam and hot milk foam, while limiting the manufacturing cost of beverage dispensing equipment equipped with such a milk foaming system.

[0012] Therefore, the present invention relates to a milk frothing system, comprising a hot milk frothing device and a cold milk frothing device, each of the hot milk frothing device and the cold milk frothing device being configured to cooperate with a beverage dispensing device, each of the hot and cold milk frothing devices comprising: - A mixing portion, the mixing portion comprising: o A main flow conduit, the main flow conduit comprising: a cross-sectional constraint; a first conduit portion located upstream of the cross-sectional constraint and extending to the cross-sectional constraint; and a second conduit portion located downstream of the cross-sectional constraint and extending from the cross-sectional constraint; o A mixing chamber, which is fluidly connected to the main flow conduit and is equipped with an outlet orifice; - A closing section, configured to occupy a closed position and an open position, wherein in the closed position, the closing section closes the corresponding mixing chamber and the corresponding main flow conduit, and in the open position, the corresponding mixing chamber and the corresponding main flow conduit are open and accessible for cleaning; - A water supply conduit, the water supply conduit including a water outlet orifice leading to the respective first conduit portion; - A milk supply conduit, the milk supply conduit including a milk outlet orifice leading to the corresponding main flow conduit; and - An air supply duct, which is fluidly connected to the corresponding main flow duct. The milk outlet hole of the cold milk frothing device has a different cross-section than the milk outlet hole of the hot milk frothing device, and the downstream end of the first conduit portion of the cold milk frothing device has a different cross-section than the downstream end of the first conduit portion of the hot milk frothing device.

[0013] This configuration of the milk frothing system allows for the production of hot milk foam using a hot milk frothing unit and cold milk foam using a cold milk frothing unit, without requiring modifications to the associated beverage dispensing equipment, and especially the heating elements, and more specifically the thermal regulation of the boiler, which generates hot water or steam for delivery via water supply conduits. Therefore, it is particularly unnecessary to equip the beverage dispensing equipment with a detection device capable of automatically detecting the milk frothing units (in the hot and cold milk frothing units) connected to the beverage dispensing equipment, or even to adapt a user interface to the beverage dispensing equipment that allows the user to indicate which milk frothing unit (in the hot and cold milk frothing units) is connected to the beverage dispensing equipment. This allows for a significant reduction in the manufacturing cost of the beverage dispensing equipment and simplifies its use.

[0014] The milk foaming system may also have one or more of the following features, which may be used alone or in combination.

[0015] According to one embodiment of the present invention, the water supply conduit is a cold water, hot water, or steam supply conduit, and preferably a hot water / steam supply conduit.

[0016] According to one embodiment of the invention, each cross-sectional limiting member forms a milk and air suction system based on the Venturi effect.

[0017] In other words, each main flow conduit is configured such that the flow of water in the main flow conduit from the corresponding water outlet to the corresponding mixing chamber creates negative pressure in the corresponding milk supply conduit and negative pressure in the corresponding air supply conduit, resulting in the drawing of milk and air into the corresponding main flow conduit. This configuration of each of the cold and hot milk frothing devices allows control over the amount of air and milk entering the corresponding mixing chamber without the need for complex and expensive entry devices.

[0018] According to one embodiment of the invention, each milk supply conduit leads to the corresponding main flow conduit near the corresponding cross-sectional limiting member.

[0019] According to one embodiment of the invention, the milk outlet orifice of the cold milk frothing device has a larger cross-sectional area than that of the milk outlet orifice of the hot milk frothing device. This construction of the cold milk frothing device, and especially its milk outlet orifice, ensures a significantly higher milk flow rate in the main flow conduit (compared to that of the hot milk frothing device). This allows for reduced heating of the milk by water flowing in the main flow conduit, and especially by steam, and thus produces milk foam at a temperature much lower than that produced by the hot milk frothing device.

[0020] According to one embodiment of the invention, the ratio of the cross-sectional area of ​​the milk outlet hole of the cold milk frothing device to the cross-sectional area of ​​the milk outlet hole of the hot milk frothing device is greater than 2, and for example, between 2 and 15, and advantageously between 4 and 9.

[0021] According to one embodiment of the invention, the milk outlet orifice of the cold milk frothing device has a diameter between 3 mm and 6 mm, and for example, equal to about 4.3 mm. This size design of the milk outlet orifice of the cold milk frothing device allows for a further increase in the milk suction flow rate in the corresponding main flow conduit, and thus further reduces the heating of the milk by the water flowing in the main flow conduit, and especially by water vapor.

[0022] According to one embodiment of the invention, the milk outlet hole of the cold milk frothing device has a diameter between 1 mm and 2 mm, and for example equal to about 1.6 mm.

[0023] According to one embodiment of the invention, the downstream end of the first conduit portion of the cold milk frothing device has a smaller cross-sectional area than the downstream end of the first conduit portion of the hot milk frothing device. This configuration of the cold milk frothing device allows for an increase in head loss within the first conduit portion of the cold milk frothing device, and on the other hand, an increase in milk suction flow rate in the corresponding main flow conduit. Therefore, this value of the aforementioned ratio allows for a further reduction in the heating of the milk by water flowing in the main flow conduit of the cold milk frothing device, and especially by water vapor, and thus a further reduction in the temperature of the milk foam generated by the cold milk frothing device.

[0024] According to one embodiment of the present invention, the downstream end of the first conduit portion of the cold milk frothing device has a diameter between 0.5 mm. 2 Up to 3 mm 2 Between and, for example, between 0.7 mm 2 Up to 1.3 mm 2 The cross-section between them. This dimensional design of the downstream end of the first conduit portion of the cold milk frothing device allows for increased head loss within the first conduit portion, and thus increased negative pressure at the corresponding cross-sectional limit and therefore at the corresponding milk outlet.

[0025] According to one embodiment of the present invention, the ratio of the cross-sectional area of ​​the downstream end of the first conduit portion of the hot milk foaming device to the cross-sectional area of ​​the downstream end of the first conduit portion of the cold milk foaming device is greater than 1.1 and, for example, between 1.1 and 2.5.

[0026] According to one embodiment of the present invention, the upstream end of the second conduit portion of the cold milk foaming device has a cross-sectional area smaller than that of the upstream end of the second conduit portion of the hot milk foaming device.

[0027] According to one embodiment of the present invention, the upstream end of the second conduit portion of the hot milk frothing device has a diameter of 2.2 mm. 2 Up to 3.5 mm 2 Between and, for example, between 2.4 mm 2 Up to 2.8 mm 2 The cross section between them.

[0028] According to one embodiment of the present invention, the upstream end of the second conduit portion of the cold milk frothing device has a diameter of 4 mm. 2 Up to 18 mm 2 Between, advantageously between 5mm 2 Up to 15 mm 2 Between and, for example, between 5 mm 2 Up to 12 mm2 The cross section between them.

[0029] According to one embodiment of the invention, each first conduit portion has a through cross-section that decreases along the direction of the corresponding cross-sectional limiting member, and each second conduit portion has a through cross-section that increases along the direction of the corresponding mixing chamber.

[0030] According to one embodiment of the invention, the second conduit portion of each of the hot and cold milk frothing devices includes two sidewalls that are parallel or diverge in the direction of the respective mixing chamber. Advantageously, the two sidewalls of the second conduit portion of the hot milk frothing device are inclined relative to each other at an angle between 10° and 25°, and for example, an angle equal to about 15°, and the two sidewalls of the second conduit portion of the cold milk frothing device are inclined relative to each other at an angle between 0° and 10°, and for example, an angle equal to about 4°.

[0031] According to one embodiment of the present invention, the taper of the second conduit portion of the cold milk foaming device is smaller than the taper of the second conduit portion of the hot milk foaming device.

[0032] According to one embodiment of the present invention, the upstream end of the second conduit portion of the cold milk foaming device has a width greater than the width of the upstream end of the second conduit portion of the hot milk foaming device.

[0033] According to one embodiment of the invention, the upstream end of the second conduit portion of the cold milk foaming device has a width greater than or equal to 2 mm, advantageously between 2.5 mm and 5 mm, and for example equal to 3.5 mm or 4 mm.

[0034] According to one embodiment of the invention, the upstream end of the second conduit portion of the hot milk foaming device has a width of less than 2 mm and, for example, equal to about 1.5 mm.

[0035] According to one embodiment of the present invention, the downstream end of the second conduit portion of the cold milk foaming device has a width between 2 mm and 6 mm.

[0036] According to one embodiment of the invention, the upstream end of the second conduit portion of each of the hot and cold milk foaming devices has a height between 1.5 mm and 4 mm.

[0037] According to one embodiment of the present invention, the minimum height of the second conduit portion of the cold milk frothing device is greater than the minimum height of the second conduit portion of the hot milk frothing device.

[0038] According to one embodiment of the present invention, the upstream end of the second conduit portion of the cold milk foaming device has a greater height than the upstream end of the second conduit portion of the hot milk foaming device.

[0039] According to one embodiment of the present invention, the upstream end of the second conduit portion of the hot milk frothing device has a height between 1.5 mm and 2 mm, and for example equal to about 1.7 mm, and the upstream end of the second conduit portion of the cold milk frothing device has a height between 2 mm and 4 mm, and for example equal to about 2.3 mm.

[0040] According to one embodiment of the invention, the first conduit portion of each of the cold and hot milk frothing devices has a generally rectangular cross-section.

[0041] According to one embodiment of the invention, the second conduit portion of each of the cold and hot milk frothing devices has a generally rectangular cross-section.

[0042] According to one embodiment of the present invention, the downstream end of the first conduit portion of the cold milk frothing device has a width smaller than the width of the downstream end of the first conduit portion of the hot milk frothing device.

[0043] According to one embodiment of the invention, the downstream end of the first conduit portion of the cold milk foaming device has a width between 0.7 mm and 1.1 mm, and for example equal to about 1 mm.

[0044] According to one embodiment of the invention, the downstream end of the first conduit portion of the hot milk frothing device has a width between 1.1 mm and 1.5 mm, and for example equal to about 1.25 mm.

[0045] According to one embodiment of the present invention, the downstream end of the first conduit portion of the cold milk foaming device has a lower height than the downstream end of the first conduit portion of the hot milk foaming device.

[0046] According to one embodiment of the invention, the downstream end of the first conduit portion of the cold milk foaming device has a height between 0.6 mm and 1.1 mm, and for example equal to about 0.9 mm.

[0047] According to one embodiment of the invention, the downstream end of the first conduit portion of the hot milk frothing device has a height between 1.1 mm and 1.5 mm, and for example equal to about 1.25 mm.

[0048] According to one embodiment of the present invention, the air supply conduit of the cold milk foaming device has a cross-sectional area that is larger than that of the air supply conduit of the hot milk foaming device.

[0049] According to one embodiment of the invention, for the cold milk frothing device, the ratio of the cross-sectional area of ​​the milk outlet to the cross-sectional area of ​​the downstream end of the first conduit portion is greater than 3 and, for example, between 3 and 40, and advantageously between 3.5 and 31. This configuration of the cold milk frothing device, and particularly the main flow conduit and the milk outlet, ensures a significantly greater milk flow rate in the main flow conduit (compared to the hot milk frothing device), which allows for a significant reduction in the heating of the milk by the water flowing in the main flow conduit, and especially by water vapor, and thus produces milk foam that is substantially at ambient temperature.

[0050] According to one embodiment of the invention, the bottom wall of the second conduit portion of the cold milk frothing device includes at least one surface portion that is inclined relative to the horizontal plane (advantageously between 5° and 25° and, for example, an inclination angle of about 15°), such that the height of the second conduit portion increases along the direction of the respective mixing chamber.

[0051] According to one embodiment of the invention, each main flow conduit is completely defined by the corresponding mixing section and the corresponding closing section. Therefore, the milk proteins contained in the milk flowing in each main flow conduit cannot change the geometry of the main flow conduit, and thus will not affect the amount of air introduced into the corresponding mixing chamber.

[0052] According to one embodiment of the invention, each of the hot and cold milk frothing devices includes an airflow regulating device configured to regulate the airflow rate flowing in the respective air supply duct. The presence of such an airflow regulating device allows the user to adapt the consistency of the obtained milk foam to their desired consistency and also to modify the volume and / or quantity of the obtained foam. The user can, for example, adjust the airflow introduced into the respective mixing chamber to obtain more or less stable milk foam.

[0053] According to one embodiment of the present invention, each airflow regulating device includes: - A flow regulating component, such as a flow regulating button, said flow regulating component is mounted to move along the displacement direction, and is mounted, for example, to move by translation or also by helical motion, and is configured to occupy a plurality of regulating positions offset from each other along the displacement direction; and - A sealing element, such as an annular sealing element, which partially defines an airflow passage having a cross-section that varies depending on the position occupied by the corresponding flow regulating member.

[0054] This configuration of the airflow regulating device allows for easy adjustment of the amount of air introduced into the corresponding main flow duct by displacing the flow regulating member to an adjustment position corresponding to the desired foam consistency.

[0055] According to one embodiment of the invention, each sealing element is fixed to the corresponding flow regulating member.

[0056] According to one embodiment of the invention, each air supply conduit includes a calibrated air passage, such as an annular calibrated air passage, configured to define a maximum airflow rate in the air supply conduit. The presence of such a calibrated air passage allows excessive air to be prevented from entering the corresponding mixing chamber, and thus avoids obtaining over-aerated and / or milk foam with large-diameter bubbles.

[0057] According to one embodiment of the invention, each calibrated air passage is located downstream of the corresponding airflow regulating device, and for example, downstream of the corresponding airflow passage.

[0058] According to one embodiment of the present invention, each airflow regulating device includes a support portion fixed to the corresponding closing portion and configured to support the corresponding flow regulating member, each flow regulating member being mounted to move relative to the corresponding support portion.

[0059] According to one embodiment of the invention, each support portion includes an insertion hole, and each airflow regulating device further includes a passage limiting member at least partially received in the respective insertion hole, each insertion hole and the respective passage limiting member defining the respective calibrated air passage. This configuration of each calibrated air passage allows for easy cleaning of the respective milk frothing device, and particularly the calibrated air passage, by removing the passage limiting member outside the insertion hole and then cleaning, in particular, the passage limiting member and the insertion hole. Furthermore, this configuration of each calibrated air passage substantially limits the risk of blockage, because the continuous movement of the respective flow regulating member along the displacement direction results in the discharge of any particles, such as dust particles, retained in the calibrated air passage.

[0060] According to one embodiment of the present invention, the sealing element and the support portion of each of the airflow regulating devices define the corresponding airflow path.

[0061] According to one embodiment of the invention, each closed portion is configured to cover the corresponding mixed portion.

[0062] According to one embodiment of the invention, each shut-off section includes the corresponding air supply conduit. This arrangement of each air supply conduit allows for a significant limitation of the risk of spoilage caused by milk proteins contained in the milk flowing in the corresponding main flow conduit, and thus ensures a controlled amount of air entering the corresponding mixing chamber.

[0063] According to one embodiment of the invention, each mixing section includes at least a portion of the corresponding milk supply conduit.

[0064] According to one embodiment of the invention, each of the hot and cold milk foaming devices includes a sealing joint disposed in an engagement area between the respective mixing section and the respective shut-off section, and each sealing joint extends around the respective mixing chamber and the respective main flow conduit.

[0065] According to one embodiment of the invention, each mixing section includes an air inlet channel configured to be closed by a corresponding closing section, and each air inlet channel connects the corresponding air supply conduit to the corresponding main flow conduit. Advantageously, each sealing joint extends around the corresponding air inlet channel.

[0066] According to one embodiment of the invention, each air inlet channel leads to the corresponding main flow duct near the corresponding cross-sectional constraint.

[0067] According to one embodiment of the invention, each mixing chamber is cyclone-shaped and configured to extend substantially vertically, with each main flow conduit leading to the upper part of the respective mixing chamber, and the outlet orifice of each mixing chamber located in the lower part of the mixing chamber. This configuration of each mixing chamber facilitates the mixing of air, milk, and hot water, cold water, or steam introduced into the mixing chamber.

[0068] According to one embodiment of the invention, each of the hot and cold milk frothing devices includes a milk reservoir, the milk reservoir including an upper filling opening, and each mixing portion is arranged at the corresponding upper filling opening.

[0069] According to one embodiment of the invention, each mixing section is configured to at least partially close the corresponding milk reservoir and is configured to be removable relative to the milk reservoir.

[0070] According to one embodiment of the invention, each of the cold and hot milk frothing devices includes a milk pouring conduit that is fluidly connected to the outlet hole of the respective mixing chamber and configured to be vertically positioned above a container, such as a cup.

[0071] According to one embodiment of the invention, each of the cold and hot milk frothing devices includes a holding system configured to hold the corresponding closed portion in a closed position. This configuration of the holding system allows for the avoidance of untimely displacement of the corresponding closed portion toward an open position.

[0072] According to one embodiment of the invention, each retaining system is configured to removably, that is, temporarily and reversibly, fix the respective closed portion to the respective mixed portion.

[0073] According to one embodiment of the invention, each of the cold and hot milk frothing devices includes a fixing system configured to removably, that is, temporarily and reversibly fix the respective mixing portion to the respective milk storage container.

[0074] According to one embodiment of the invention, each mixing section includes an upper surface, in which a corresponding main flow conduit is disposed, and the corresponding mixing chamber opens to the upper surface.

[0075] The present invention also relates to a beverage dispensing device and a coffee machine, such as an automatic coffee machine, the beverage dispensing device comprising a water outlet end and a milk frothing system according to the invention, wherein the water supply conduit of each of the hot and cold milk frothing devices is configured to be fluidly connected to the water outlet end.

[0076] According to one embodiment of the invention, the beverage dispensing device includes a boiler configured to generate hot water and / or steam. Advantageously, the water outlet end is fluidly connected to the boiler.

[0077] The term "automatic coffee machine" can be understood as a coffee machine that includes, in particular, an infusion chamber that can be supplied with coffee grounds by a grinder incorporated into the machine, or an infusion chamber that can hold coffee capsules or small packets of coffee, or an infusion chamber formed by a spoon-shaped piece for filling with coffee grounds and manually emptying them. Attached Figure Description

[0078] The invention will be better understood with reference to the following illustrative drawings, which illustrate embodiments of the milk frothing device by way of non-limiting example.

[0079] Figure 1 This is a three-dimensional top view of the milk foaming device according to the present invention.

[0080] Figure 2 yes Figure 1 A top view of a milk foaming device.

[0081] Figure 3 yes Figure 1 A longitudinally truncated perspective view of a milk foaming device.

[0082] Figure 4 yes Figure 1 A three-dimensional view of the sealing joint of the milk foaming device.

[0083] Figure 5 yes Figure 1 A partial three-dimensional top view of a milk foaming device.

[0084] Figure 6 yes Figure 1 A partial three-dimensional top view of the milk foaming device, in which a sealing joint has been placed.

[0085] Figure 7 This is a partial perspective top view of the hot milk foaming device according to the present invention.

[0086] Figure 8 yes Figure 7 A partial three-dimensional top view of the milk foaming device, in which a sealing joint has been placed.

[0087] Figure 9 yes Figure 1 A three-dimensional top view of the mixing and closing parts of a milk frothing device.

[0088] Figure 10 yes Figure 7 A partial exploded view of the milk foaming device.

[0089] Figure 11 yes Figure 1 The milk frothing device is equipped with Figure 4 A partial three-dimensional top view of the mixed part of the sealing joint.

[0090] Figure 12 yes Figure 1 The milk frothing device is equipped with Figure 4 A magnified top view of the mixing section of the sealing joint.

[0091] Figure 13 yes Figure 7 The milk frothing device is equipped with Figure 4 A partial three-dimensional top view of the mixed part of the sealing joint.

[0092] Figure 14 yes Figure 7 The milk frothing device is equipped with Figure 4 A magnified top view of the mixing section of the sealing joint.

[0093] Figure 15 yes Figure 1 A partial perspective view of the milk foaming device cut longitudinally.

[0094] Figure 16 yes Figure 1 A three-dimensional bottom view of a sub-component of a milk foaming device.

[0095] Figure 17 It belongs to Figure 1 A three-dimensional top view of the locking part of the milk foaming device.

[0096] Figure 18 yes Figure 1 A partial top view of the mixing section of the milk foaming device.

[0097] Figure 19 yes Figure 1 A cross-sectional view of a milk foaming device.

[0098] Figure 20 It belongs to Figure 1 A partial three-dimensional top view of the airflow regulating device of the milk foaming device.

[0099] Figure 21 It belongs to Figure 20 A three-dimensional top view of the support part of the airflow regulating device.

[0100] Figure 22 It belongs to Figure 20 A three-dimensional top view of the support part and passage restriction component of the airflow regulating device.

[0101] Figure 23 yes Figure 20 A partial three-dimensional top view of the airflow regulating device.

[0102] Figure 24 yes Figure 20 A longitudinal sectional view of the airflow regulating device.

[0103] Figure 25 It is equipped with Figure 1 A 3D diagram of an automatic coffee machine with a milk frothing device. Detailed Implementation

[0104] In this document, the term "open" in relation to the main flow conduit means that the main flow conduit is open for at least 70% of its length and, for example, for its entire length.

[0105] In this document, the terms “upstream” and “downstream” for the main flow duct are defined relative to the direction of fluid circulation within the main flow duct under the operating conditions of the corresponding milk foaming device.

[0106] Unless otherwise specified, the term “substantially” in this document means “precise or within 10% or 10° of the exact value”.

[0107] Figures 1 to 25 A milk frothing system is shown, comprising a hot milk frothing device 2 and a cold milk frothing device 2', each of which is used in conjunction with a beverage dispensing device 3 (see...). Figure 25 For example, it can be used in conjunction with a coffee machine such as an automatic coffee machine 5. As a variation, the beverage dispensing device 3 can be a water dispenser, and especially a hot water or tea dispenser.

[0108] In the following description, the same reference numerals are used to designate the corresponding elements forming the hot milk frothing device 2 and the cold milk frothing device 2'.

[0109] The beverage dispensing device 3 specifically includes a frame 301, a container support 302, and a beverage dispensing head 303, on which the container can be mounted. The beverage dispensing head 303 includes at least one nozzle, preferably two coffee outlet nozzles 304A and 304B.

[0110] The beverage dispensing device 3 includes a control circuit 305 for managing the dispensing of beverages according to instructions given by the user. The beverage dispensing device 3 also advantageously includes a boiler 306 for generating hot water and / or steam, and a storage tank 307 for forming a cold water reserve. The storage tank 307 allows for the supply of hot water and / or steam to the boiler 306.

[0111] The beverage dispensing device 3 also includes a water outlet end piece 308. The water outlet end piece 308 is connected to the reservoir 307. Advantageously, the outlet end piece 308 is a hot water / steam outlet end piece suitable for supplying hot water and / or steam by the boiler 306.

[0112] In a known but not shown manner, the beverage dispensing device 3 advantageously includes a coffee bean storage container, an automatic grinder, and a brewing chamber adapted to hold ground coffee beans and to be supplied with hot water by a boiler 306. The brewing chamber is fluidly connected to a beverage dispensing head 303, such that the beverage dispensing device 3 is adapted to dispense coffee-based beverages at coffee outlet nozzles 304A, 304B.

[0113] Each of the hot and cold milk frothing devices 2, 2' includes a milk reservoir 4, which defines an internal volume for containing milk and includes an upper filling opening 5 through which milk can be guided into the respective milk reservoir 4. Each milk reservoir 4 may have, for example, a rectangular, circular, or elliptical cross-section.

[0114] Each of the hot and cold milk frothing devices 2 and 2' also includes a mixing section 6, which is arranged at the corresponding filling opening 5.

[0115] According to the embodiment shown in the figure, each mixing section 6 includes a closing body 7 configured to close the corresponding milk reservoir 4 and configured to be removable relative to the corresponding milk reservoir 4. More specifically, each closing body 7 is configured to be received in the upper part of the corresponding milk reservoir 4 and configured to be inserted into the corresponding milk reservoir 4 via the corresponding upper filling opening 5.

[0116] Advantageously, each closing body 7 is configured to remain stationary relative to the corresponding milk reservoir 4 when it is housed within the respective milk reservoir 4. For this purpose, each closing body 7 advantageously has a rectangular cross-section.

[0117] According to the embodiment shown in the figure, each closing body 7 includes a lower body 7.1 (see figure 7.1). Figure 18 ) and the upper main body 7.2 (see Figure 10 The lower body 7.1 and the upper body 7.2 are fixed to each other, and the lower body 7.1 and the upper body 7.2 define the internal accommodating portion 8, the function of which will be described below.

[0118] like Figure 18 As shown, each of the hot and cold milk frothing devices 2 and 2' includes a fixing device 9 configured to removably, that is, temporarily and reversibly fix the corresponding mixing portion 6, more specifically the corresponding closing body 7, to the corresponding milk storage container 4.

[0119] According to the embodiment shown in the figure, each fixing device 9 includes a plurality of locking members 11, such as locking fingers, housed in a corresponding internal receiving portion 8. Each locking member 11 is more specifically configured to protrude beyond the corresponding closing body 7 through a corresponding through opening 12 leading to the outer peripheral surface of the corresponding closing body 7.

[0120] Each fixing device 9 also includes a plurality of locking elements 13 disposed on the corresponding milk reservoir 4 and located near the corresponding filling opening 5. According to the embodiment shown in the figures, each locking element 13 is formed by a locking hole configured to receive the corresponding locking member 11 when the corresponding closing body 7 is fixed to the corresponding milk reservoir 4. However, according to a variation of the invention, the locking element 13 may, for example, be a locking receiving portion disposed on the inner surface of the corresponding milk reservoir 4.

[0121] More specifically, the locking member 11 is mounted to slide relative to the corresponding closing body 7 along the sliding direction D1 between a locked position and a released position. In the locked position, each locking member 11 protrudes beyond the corresponding closing body 7 through the corresponding through opening 12 and is configured to cooperate with the corresponding locking element 13 to secure the corresponding closing body 7 to the corresponding milk reservoir 4. In the released position, each locking member 11 is configured to release the corresponding locking element 13, allowing the corresponding closing body 7 to be removed from the corresponding milk reservoir 4. Advantageously, the sliding direction D1 extends substantially orthogonally to the central axis of the corresponding closing body 7.

[0122] Each locking member 11 may be configured, for example, to retract into place from the outer peripheral surface of the corresponding closing body 7 or to be flush with the outer peripheral surface when the locking member 11 is in the released position.

[0123] like Figure 18 As shown, each of the hot and cold milk frothing devices 2, 2' includes an actuation mechanism 14 disposed on the respective closing body 7 and configured to displace the respective locking member 11 to a released position when the actuation mechanism 14 is actuated by the user.

[0124] Each actuating mechanism 14 more specifically includes an actuating member 15, such as an actuation button, which can be manually actuated by a user and is configured to displace a corresponding locking member 11 from a locked position to a released position. Advantageously, each actuating member 15 is mounted to slide relative to the corresponding closing body 7 between a first actuated position and a second actuated position along a sliding direction D1. Each actuating mechanism 14 and the corresponding locking member 11 are more specifically configured such that displacement of the corresponding actuating member 15 from the first actuated position to the second actuated position causes displacement of the corresponding locking member 11 from the locked position to the released position.

[0125] According to the embodiment shown in the figure, each actuation mechanism 14 includes two connecting members 16 housed in a respective internal receiving portion 8, and each connecting member 16 is configured to mechanically connect a respective actuating member 15 to a respective locking member 11. Each connecting member 16 includes: a first end portion on which the respective actuating member 15 is hingedly mounted about a first hinge axis; a second end portion on which the respective locking member 11 is hingedly mounted about a second hinge axis; and an intermediate portion mounted to rotate relative to the respective closing body 7 about a rotation axis substantially parallel to the respective first and second hinge axes.

[0126] More specifically, each actuation mechanism 14 is configured such that displacement of the corresponding actuating member 15 from a first actuating position to a second actuating position causes pivoting of the two corresponding connecting members 16 along a first pivoting direction and displacement of the two corresponding locking members 11 from a locked position to a released position, and such that displacement of the corresponding actuating member 15 from a second actuating position to a first actuating position causes pivoting of the two corresponding connecting members 16 along a second pivoting direction and displacement of the two corresponding locking members 11 from a released position to a locked position.

[0127] Advantageously, each actuation mechanism 14 includes a reset element 17, such as a reset spring, which is configured to reset the corresponding actuation mechanism 15 to a first actuation position and thus to reset the two corresponding locking members 11 to a locked position.

[0128] According to the embodiment shown in the figure, each mixing part 6 also includes a mixing body 18, which is fastened to the corresponding closing body 7, for example, by a snap fastener. Each mixing body 18 is more specifically provided with a generally flat upper surface 19.

[0129] Each mixing body 18 also includes a mixing chamber 21, also referred to as a homogenization chamber, which opens to the upper surface 19 of the mixing body 18 and is equipped with an outlet orifice 22. Each mixing body 18 also includes a main flow conduit 23 disposed in the upper surface 19 of the mixing body 18 and opening to the corresponding mixing chamber 21. According to the embodiment shown in the figures, each mixing chamber 21 is cyclone-shaped and configured to extend vertically, and each main flow conduit 23 opens tangentially to the corresponding mixing chamber 21. Advantageously, each main flow conduit 23 opens to the upper part of the corresponding mixing chamber 21, and for example to the high point of the mixing chamber 21, and each outlet orifice 22 is located in the lower part of the corresponding mixing chamber 21, and for example at the low point of the mixing chamber 21.

[0130] Each main flow conduit 23 is advantageously formed within a corresponding mixing body 18, which is, for example, a plastic component. Therefore, each main flow conduit 23 is advantageously made of plastic and does not contain any elastomeric material. This arrangement limits the risk of blockage in each main flow conduit 23, which would impair the performance of the corresponding milk frothing device.

[0131] More specifically, Figure 11As shown, each main flow conduit 23 includes: a cross-sectional limiting member 24, which is located, for example, in the central portion of the main flow conduit 23; a first conduit portion 25 located upstream of the corresponding cross-sectional limiting member 24 and extending to the corresponding cross-sectional limiting member 24; and a second conduit portion 26 located downstream of the corresponding cross-sectional limiting member 24 and extending from the corresponding cross-sectional limiting member 24 to the corresponding mixing chamber 21. Advantageously, each first conduit portion 25 has a passing cross-section that decreases along the direction of the corresponding cross-sectional limiting member 24. Each second conduit portion 26 has a passing cross-section that increases along the direction of the corresponding mixing chamber 21.

[0132] According to the embodiment shown in the figure, the second conduit portion of each of the hot and cold milk frothing devices 2 and 2' includes two sidewalls that radiate outwards along the direction of the respective mixing chamber 21. Advantageously, the second conduit portion 26 of the cold milk frothing device 2' has a smaller taper than the second conduit portion 26 of the hot milk frothing device 2.

[0133] The two sidewalls of the second conduit portion 26 of the hot milk frothing device 2 are advantageously inclined relative to each other at an angle between 10° and 25° and, for example, an angle equal to about 15°, and the two sidewalls of the second conduit portion 26 of the cold milk frothing device 2' are advantageously inclined relative to each other at an angle between 0° and 10° and, for example, an angle equal to about 4°.

[0134] like Figure 11 As shown, the second conduit portion 26 of the cold milk frothing device 2' includes a bottom wall having at least one surface portion that is inclined relative to the horizontal plane, such that the height of the second conduit portion 26 increases along the direction of the mixing chamber 21. Advantageously, the surface portion is inclined relative to the horizontal plane at an angle between 5° and 25°, and for example, about 15°.

[0135] Advantageously, the downstream end of the first conduit portion 25 of the cold milk frothing device 2' has a cross-section that is different from and, for example, smaller than the cross-section of the downstream end of the first conduit portion 25 of the hot milk frothing device 2.

[0136] The ratio of the cross-sectional area of ​​the downstream end of the first conduit portion 25 of the hot milk foaming device 2 to the cross-sectional area of ​​the downstream end of the first conduit portion 25 of the cold milk foaming device 2' is advantageously between 1.1 and 2.5.

[0137] According to one embodiment of the present invention, the downstream end of the first conduit portion 25 of the cold milk frothing device 2' has a diameter between 0.5 mm. 2 Up to 3 mm 2 Between and, for example, between 0.7mm 2 Up to 1.3 mm2 The cross-section between them. This dimensional design of the downstream end of the first conduit portion 25 of the cold milk foaming device 2' allows for increased head loss within the first conduit portion 25, and thus increases the negative pressure at the corresponding cross-sectional limiter 24.

[0138] According to one embodiment of the present invention, the upstream end of the second conduit portion 26 of the cold milk frothing device 2' may, for example, have a diameter between 4 mm. 2 Up to 18 mm 2 Between, advantageously between 5 mm 2 Up to 15 mm 2 Between and, for example, between 5 mm 2 Up to 12mm 2 The cross-section between them, and the upstream end of the second conduit portion 26 of the hot milk frothing device 2 can, for example, have a cross-section between 2.2 mm and 3.2 mm. 2 Up to 3.5 mm 2 Between and, for example, between 2.4 mm 2 Up to 2.8 mm 2 The cross section between them.

[0139] According to the embodiment shown in the figure, each first catheter portion 25 has a generally rectangular cross-section, and each second catheter portion 26 also has a generally rectangular cross-section.

[0140] The downstream end of the first conduit portion 25 of the cold milk frothing device 2' advantageously has a width smaller than the width of the downstream end of the first conduit portion 25 of the hot milk frothing device 2, and has a height smaller than the height of the downstream end of the first conduit portion 25 of the hot milk frothing device 2.

[0141] The downstream end of the first conduit portion 25 of the cold milk frothing device 2' may, for example, have a width between 0.7 mm and 1.1 mm (and for example equal to about 1 mm) and a height between 0.6 mm and 1.1 mm, for example equal to 0.9 mm, and the downstream end of the first conduit portion 25 of the hot milk frothing device 2 may, for example, have a width between 1.1 mm and 1.5 mm (and for example equal to about 1.25 mm) and a height between 1.1 mm and 1.5 mm, for example equal to about 1.25 mm.

[0142] The upstream end of the second conduit portion 26 of the cold milk frothing device 2' advantageously has a width greater than the width of the upstream end of the second conduit portion 26 of the hot milk frothing device 2, and has a height greater than the height of the upstream end of the second conduit portion 26 of the hot milk frothing device 2.

[0143] The upstream end of the second conduit portion 26 of the cold milk frothing device 2' may, for example, have a width greater than or equal to 2 mm, advantageously between 2.5 mm and 5 mm and for example equal to 3.5 mm or 4 mm, and a height between 2 mm and 4 mm and for example equal to about 2.3 mm; and the upstream end of the second conduit portion 26 of the hot milk frothing device 2 may, for example, have a width less than 2 mm and for example equal to about 1.5 mm, and a height between 1.5 mm and 2 mm and for example equal to about 1.7 mm.

[0144] In other words, the upstream end of the second conduit section of each of the hot and cold milk frothing devices 2 and 2' has a height between 1.5 mm and 4 mm.

[0145] Each mixing section 6 also includes a connecting end piece 27 configured to connect to the water outlet end piece 308 of the beverage dispensing device 3, and advantageously configured to be fluidly connected to a boiler 306 equipped with the beverage dispensing device 3, and configured to generate hot water and / or steam. Advantageously, each connecting end piece 27 extends radially relative to the central axis of the corresponding mixing body 18, and is configured to extend radially relative to the central axis of the corresponding milk reservoir 4.

[0146] Each mixing section 6 also includes a water supply conduit 28 (see...) Figure 15 The water supply conduit 28 is fluidly connected to the corresponding connecting end 27, and the water supply conduit 28 is provided with a water outlet hole 29, which leads to the corresponding first conduit portion 25 and is more specifically opposite to the corresponding mixing chamber 21. Advantageously, each water supply conduit is a hot water / steam supply conduit.

[0147] Therefore, each main flow conduit 23 is configured to fluidly connect the water outlet orifice 29 to the corresponding mixing chamber 21, and is configured to allow hot water, cold water or steam to flow into the corresponding main flow conduit 23 and up to the corresponding mixing chamber 21.

[0148] Each of the hot and cold milk frothing devices 2, 2' also includes a milk supply conduit 31 which is fluidly connected to a corresponding main flow conduit 23 and is thus configured to be fluidly connected to a corresponding mixing chamber 21 via the corresponding main flow conduit 23.

[0149] More specifically, Figure 3As shown, each milk supply conduit 31 includes: a milk suction tube 32 fixed to the corresponding mixing portion 6 (and more specifically to the mixing body 18), configured to extend vertically and lead to the lower part of the corresponding milk reservoir 4; and a calibrated flow passage 33 defined by the corresponding mixing body 18 and fluidly connected to the corresponding milk suction tube 32, for example via a connecting conduit 34. Therefore, each calibrated flow passage 33 is located downstream of the corresponding milk suction tube 32 and is configured to define a predetermined milk flow rate in the corresponding milk supply conduit 31.

[0150] Each calibrated flow path 33 more specifically includes a milk outlet orifice 35, which is, for example, a circular cross-section, leading to a corresponding main flow conduit 23 at a corresponding cross-section limiter 24.

[0151] Advantageously, the milk outlet orifice 35 of the cold milk frothing device 2' has a cross-sectional area different from, and more specifically larger than, the cross-sectional area of ​​the milk outlet orifice 35 of the hot milk frothing device 2. The ratio of the cross-sectional area of ​​the milk outlet orifice 35 of the cold milk frothing device 2' to that of the hot milk frothing device 2' is advantageously greater than 2 and, for example, between 2 and 15, and advantageously between 4 and 9. This dimensional design of the milk outlet orifice 35 of the cold milk frothing device 2' allows for an increase in the milk suction flow rate in the corresponding main flow conduit 23 and thus reduces the heating of the milk by the steam flowing in the main flow conduit 23.

[0152] According to one embodiment of the present invention, the milk outlet hole 35 of the cold milk frothing device 2' has a diameter between 3 mm and 6 mm and, for example, equal to 4.3 mm, and the milk outlet hole 35 of the hot milk frothing device 2 has a diameter between 1 mm and 2 mm and, for example, equal to about 1.6 mm.

[0153] Advantageously, the cold milk frothing device 2' is configured such that the ratio of the cross-section of the milk outlet hole 35 to the cross-section of the downstream end of the first conduit portion 25 is between 3 and 40, and for example between 3.5 and 31. Such a ratio may be, for example, equal to about 10.5 or 14.5.

[0154] This construction of the downstream end of the first conduit section 25 and the milk outlet hole 35 of the cold milk foaming device 2' ensures a significantly greater milk suction flow rate in the corresponding main flow conduit 23 (relative to the milk suction flow rate in the main flow conduit 23 of the hot milk foaming device 2), which allows for a significant reduction in the heating of the milk by the steam flowing in the main flow conduit 23 and thus the generation of cold milk foam, that is, milk foam at essentially ambient temperature.

[0155] According to the embodiment shown in the figure, each mixing body 18 further includes an air inlet channel 36 disposed in the upper surface 19 of the mixing body 18, and the air inlet channel 36 leads to a corresponding main flow conduit 23 at a corresponding cross-sectional limiting member 24. Therefore, each air inlet channel 36 is configured to be fluidly connected to a corresponding mixing chamber 21 via the corresponding main flow conduit 23.

[0156] Each cross-sectional limiting member 24 induces an increase in the velocity of the steam flowing in the corresponding main flow conduit 23, which generates negative pressure in the corresponding milk supply conduit 31 and the corresponding air inlet channel 36. Therefore, each cross-sectional limiting member 24 is more specifically configured to form a milk and air suction system based on the Venturi effect. Thus, each main flow conduit 23 is configured such that the flow of hot water, cold water, or steam from the water outlet 29 to the corresponding mixing chamber 21 generates negative pressure in the corresponding milk supply conduit 31 and the corresponding air inlet channel 36, thereby causing milk and air to be drawn into the corresponding main flow conduit 23 and the drawn milk and air to flow into the corresponding mixing chamber 21. Furthermore, each second conduit portion 26, having a through cross-section that increases in the direction of the mixing chamber 21, promotes the first mixing of steam, milk, and air from the water outlet 29, the corresponding milk supply conduit 31, and the corresponding air inlet channel 36, respectively, before they reach the corresponding mixing chamber 21, where homogenization of the mixture is achieved, particularly through cyclonic motion. Therefore, each second conduit portion 26 forms a first mixing zone in which the first mixing takes place, and each mixing chamber 21 forms a second mixing zone in which the mixing that began in the corresponding first mixing zone continues.

[0157] Each mixing section 6 also includes a milk pouring conduit 37, which is fluidly connected to the outlet port 22 of the corresponding mixing chamber 21 and is configured to allow milk and milk foam to be poured into a container, such as a cup, positioned vertically below the milk pouring conduit 37. Advantageously, each milk pouring conduit 37 is configured to extend radially relative to the central axis of the corresponding milk reservoir 4.

[0158] More specifically, Figure 4 and Figure 11 As shown, each of the hot and cold milk frothing devices 2 and 2' includes a sealing joint 38 extending around the respective mixing chamber 21, the respective main flow conduit 23, and the respective air inlet channel 36. For this purpose, each mixing body 18 includes a receiving recess 39 disposed in the upper surface 19 of the mixing body 18, and the respective sealing joint 38 is received in the receiving recess 39.

[0159] According to the embodiment shown in the figure, each sealing joint 38 includes: a joint body 38.1 integrally received in a corresponding receiving groove 39; and a sealing lip 38.2 extending along the corresponding joint body 38.1 and protruding beyond the corresponding receiving groove 39. Advantageously, each sealing joint 38 is continuous.

[0160] Each of the hot and cold milk frothing devices 2, 2' also includes a closing portion 41 configured to cover and abut against the respective mixing body 18.

[0161] like Figure 3 As shown, each closing portion 41 is generally flat, and each sealing joint 38 is therefore arranged in the engagement area between the corresponding mixing portion 6 and the corresponding closing portion 41, which is generally flat.

[0162] Each closing section 41 is more specifically mounted to move between a closed position and an open position relative to the corresponding mixing section 6. In the closed position, the closing section 41 closes the corresponding mixing chamber 21, the corresponding main flow duct 23, and the corresponding air inlet channel 36. In the open position, the mixing chamber 21, the corresponding main flow duct 23, and the corresponding air inlet channel 36 are open and accessible for cleaning.

[0163] Advantageously, each of the hot and cold milk frothing devices 2, 2' includes a holding system 42 configured to hold the corresponding shut-off portion 41 in the closed position and to ensure that the corresponding sealing joint 38 is compressed when the corresponding shut-off portion 41 is in the closed position. More specifically, each holding system 42 is configured to abut the corresponding shut-off portion 41 against the upper surface 19 of the corresponding mixing body 18 when the corresponding shut-off portion 41 is in the closed position, so as to compress the corresponding sealing joint 38, and more specifically, to compress the sealing lip 38.2 of the corresponding sealing joint 38. According to the embodiment shown in the figures, each holding system 42 is also configured to removably, that is, temporarily and reversibly secure the corresponding shut-off portion 41 to the corresponding mixing part 6.

[0164] like Figure 3 As shown, each retaining system 42 includes a locking portion 43, such as a locking ring, which is mounted to rotate relative to the corresponding closing portion 41 about a rotation axis A between a released position and a locked position. In the released position, the locking portion 43 allows the corresponding closing portion 41 to displace toward the open position, and in the locked position, the locking portion 43 prevents the corresponding closing portion 41 from displacing toward the open position. When the mixing portion 6 is housed in the corresponding milk reservoir 4 and the closing portion 41 is in the closed position, the rotation axis A is advantageously substantially parallel to and, for example, collinear with the central axis of the corresponding milk reservoir 4.

[0165] According to the embodiment shown in the figure, each closing portion 41 is configured to occupy an intermediate position between a closed position and an open position, and in this intermediate position, the closing portion 41 rests on the sealing lip 38.2 of the corresponding sealing joint 38 and is thus positioned facing the corresponding mixing chamber 21 and the corresponding main flow conduit 23 and spaced apart from the corresponding mixing portion 6. Each retaining system 42 is configured to displace the corresponding closing portion 41 from the intermediate position to the closed position along the direction of the corresponding mixing portion 6 when the locking portion 43 is displaced from the release position to the locking position, and is thus configured to bring the corresponding closing portion 41 closer to the corresponding mixing portion 6.

[0166] like Figure 5 and Figure 17 As shown, each retaining system 42 further includes: a plurality of retaining members 44, such as retaining ramps or retaining grooves, which are disposed on the respective mixing body 18 and distributed around the central axis of the mixing body 18; and a plurality of retaining elements 45, such as retaining lugs, which are disposed on the respective locking portion 43 and distributed around the axis of rotation A. The retaining elements 45 are configured to cooperate with the retaining members 44 disposed on the respective mixing body 18 when the respective locking portion 43 is rotated from the released position to the locked position, so as to displace the locking portion 43 in the direction of the respective mixing portion 6. The retaining members 44 and retaining elements 45 belonging to the same retaining system 42 can, for example, form a bayonet-type or screw-nut type retaining system. According to the embodiment shown in the figure, the retaining members 44 are disposed on the outer surface of the respective mixing body 18, and the retaining elements 45 are disposed on the inner surface of the respective locking portion 43.

[0167] Advantageously, each locking portion 43 includes a support surface 46 (see in particular) Figure 15 The support surface 46 extends transversely to the axis of rotation A, and is configured to cause the corresponding closing portion 41 to displace toward the corresponding mixing portion 6 and parallel to the axis of rotation A when the locking portion 43 rotates from the release position toward the locking position. More specifically, each support surface 46 is configured to slide on the corresponding closing portion 41 as the corresponding locking portion 43 rotates between the release and locking positions. Advantageously, each support surface 46 is annular and configured to abut against the peripheral edge of the corresponding closing portion 41.

[0168] According to one embodiment of the present invention, each locking portion 43 can be non-removably mounted on the corresponding closing portion 41, such that the locking portion 43 and the corresponding closing portion 41 form a non-removable sub-assembly.

[0169] like Figure 5 and Figure 16As shown, each of the cold and hot milk frothing devices 2 and 2' includes a translation guide configured to guide the corresponding closed portion 41 to translate relative to the corresponding mixing portion 6 along a translation direction D2 when the corresponding closed portion 41 is displaced between an intermediate position and a closed position. This translation direction D2 is, for example, perpendicular to the engagement area and therefore parallel to the axis of rotation A. Each translation guide may include, for example, two guide members 47, such as guide posts, disposed on the corresponding closed portion 41; and two guide elements 48, such as guide holes, disposed on the corresponding mixing body 18 and capable of receiving the two corresponding guide members 47 respectively.

[0170] More specifically, Figure 24 As shown, each shut-off section 41 further includes: an air supply duct 49 connected to a corresponding main flow duct 23 via a corresponding air inlet channel 36; and an air flow regulating device 51 configured to regulate the air flow rate in the corresponding air supply duct 49. However, according to a variation of the invention, each mixing section 6 may not have an air inlet channel 36, and the air supply duct 49 may be directly connected to the corresponding main flow duct 23.

[0171] According to the embodiment shown in the figure, each airflow regulating device 51 includes: a support portion 52 fixed to a corresponding closing portion 41 and protruding from the upper surface of the corresponding closing portion 41; and a flow regulating member 53, such as a flow regulating button, which is supported by the corresponding support portion 52 and mounted to move relative to the corresponding support portion 52 in a displacement direction D3, and is mounted, for example, to move according to a helical motion, wherein the displacement direction D3 may be substantially vertical, for example, when the corresponding milk frothing device is placed on a horizontal surface.

[0172] Each flow regulating member 53 and its corresponding support portion 52 may extend coaxially relative to each other, for example, and each support portion 52 may include, for example, two guide fingers 54 (see in particular). Figure 20 The two guide fingers 54 are radially opposite each other and are mounted to slide in two spiral guide grooves 55 respectively provided on the corresponding flow regulating member 53.

[0173] According to the embodiment shown in the figure, each flow regulating member 53 includes an regulating portion 53.1 configured to cover a corresponding support portion 52, and the regulating portion 53.1 includes an upper wall covering the corresponding support portion 52 and a peripheral wall having a generally tubular shape and extending around the corresponding support portion 52. More specifically as Figure 1 and Figure 24As shown, each flow regulating member 53 also includes an operating part 53.2, which is integrated with the corresponding regulating part 53.1 and configured to be operated by the user to displace the flow regulating member 53 along the displacement direction D3.

[0174] Each flow regulating member 53 is configured to occupy multiple regulating positions offset from each other along the displacement direction D3. Advantageously, when the corresponding mixing part 6 is housed in the milk reservoir 4 and the corresponding closing part 41 is in the closed position, the displacement direction D3 is substantially parallel to the central axis of the corresponding milk reservoir 4.

[0175] Each airflow regulating device 51 also includes a sealing element 56, which is annular and fixed to the corresponding flow regulating member 53. According to the embodiment shown in the figures, each support portion 52 includes a support surface 57 disposed on the upper end surface of the support portion 52. The support surface 57 is annular, and the corresponding sealing element 56 can be compressed against the support surface 57 according to the position occupied by the corresponding flow regulating member 53.

[0176] The sealing element 56 and the support portion 52, belonging to the same airflow regulating device 51, are configured to define the airflow passage 58 (see...). Figure 23 The airflow passage 58 has a cross-section that varies depending on the position occupied by the corresponding flow regulating member 53. More specifically, each airflow passage 58 is configured to fluidly connect an air inlet opening 59 defined by the corresponding air flow regulating device 51 to a corresponding air supply duct 49. According to the embodiment shown in the figure, each air inlet opening 59 is defined by a functional gap between the corresponding flow regulating member 53 and the corresponding support portion 52.

[0177] More specifically, each flow regulating member 53 can be displaced between a maximum regulating position and a minimum regulating position, where the cross-section of the corresponding airflow passage 58 is at its maximum and the cross-section of the corresponding airflow passage 58 is at its minimum in the minimum regulating position.

[0178] like Figure 22 As shown, each support portion 52 includes a passage groove 61 disposed in a corresponding support surface 57, and the passage groove 61 partially defines a corresponding airflow passage 58. Each passage groove 61 may extend radially, for example, relative to the displacement direction D3, and has a generally V-shaped cross-section. Each flow regulating device may be configured, for example, such that when the corresponding flow regulating member 53 is in its minimum regulating position, the corresponding sealing element 56 cannot completely close the corresponding passage groove 61 and allows minimal airflow through the corresponding airflow passage 58.

[0179] More specifically, Figure 24 As shown, each air supply duct 49 includes a calibration air passage 62 located downstream of the corresponding flow regulating member 53, and the calibration air passage 62 is configured to limit the maximum air flow rate in the corresponding air supply duct 49. According to one embodiment of the invention, the calibration air passage 62 of the cold milk frothing device 2' has a cross-sectional area larger than that of the calibration air passage 62 of the hot milk frothing device 2.

[0180] According to the embodiment shown in the figure, each support portion 52 includes an insertion hole 63 oriented substantially parallel to the displacement direction D3 (the insertion hole 63 has a diameter between 1.5 mm and 2 mm and, for example, equal to about 1.8 mm), and each airflow regulating device 51 includes a passage limiting member 64, such as a generally cylindrical pin or needle, having a lower end portion received in the corresponding insertion hole 63. Each passage limiting member 64 is integrally movable with the corresponding flow regulating member 53 and is thus mounted to move along the displacement direction D3 in the corresponding insertion hole 63. Advantageously, each passage limiting member 64 is elongated and extends in an extension direction parallel to the displacement direction D3. The insertion holes 63 and passage limiting members 64 belonging to the same milk frothing device more specifically define corresponding calibrated air passages 62, such that each calibrated air passage 62 is annular.

[0181] According to the embodiment shown in the figure, each support portion 52 includes a cavity 65 opening to the upper end surface of the support portion 52, and a corresponding insertion hole 63 opening into the cavity. The cavities 65 and flow regulating members 53 belonging to the same milk frothing device define an inner chamber 66 configured to fluidly connect a corresponding airflow passage 58 to a corresponding insertion hole 63.

[0182] According to another embodiment of the invention not shown in the figures, each of the hot and cold milk frothing devices 2, 2' may be without a milk reservoir. In this embodiment, each milk supply conduit 31 may be fluidly connected to a milk reservoir directly integrated into the beverage dispensing device 3 (or located on or near a container support 302 belonging to the beverage dispensing device 3), and the beverage dispensing head 303 belonging to the beverage dispensing device 3 may include a water outlet adapted to connect to each connection end 27 and be separate from one or more coffee outlet nozzles 304A, 304B.

[0183] The hot and cold milk frothing devices 2 and 2', through the design and corresponding geometry of their mixing bodies 18, allow for the generation of hot milk foam and cold milk foam respectively when associated with the beverage dispensing device 3, without having to adapt the control of the water circulation pump in the boiler 306 and the beverage dispensing device 3 to the milk frothing devices connected to the beverage dispensing device 3. Therefore, in particular, it is unnecessary to equip the beverage dispensing device 3 with a detection device capable of automatically detecting the milk frothing devices (in both the hot and cold milk frothing devices) connected to the beverage dispensing device 3.

[0184] Beverage dispensing equipment 3 is suitable for dispensing cold or hot beverages, such as cold or hot coffee, also known as "cold brew," and includes: - If the cold milk foaming device 2′ is associated with the beverage dispensing device 3, the cold milk foam will be produced at a temperature of less than 35°C, preferably less than 30°C, and more preferably less than 20°C. - If the hot milk foaming device 2 is associated with the beverage dispensing device 3, the hot milk foam will be heated to a temperature of 40°C, preferably 50°C.

[0185] Of course, the present invention is by no means limited to the embodiments described and shown by way of example only. Modifications can be made without departing from the scope of protection of the present invention, especially from the viewpoint of the construction of various elements or by substituting technical equivalents.

Claims

1. A milk frothing system comprising a hot milk frothing device (2) and a cold milk frothing device (2'), each of the hot milk frothing device (2) and the cold milk frothing device (2') being used in conjunction with a beverage dispensing device (3), each of the hot and cold milk frothing devices (2, 2') comprising: - Mixing portion (6), said mixing portion (6) includes: o Main flow conduit (23), the main flow conduit (23) comprising: a cross-sectional constraint (24), a first conduit portion (25), and a second conduit portion (26); the first conduit portion (25) is located upstream of the cross-sectional constraint (24) and extends to the cross-sectional constraint (24); the second conduit portion (26) is located downstream of the cross-sectional constraint (24) and extends from the cross-sectional constraint (24); o Mixing chamber (21), which is fluidly connected to the main flow conduit (23) and is equipped with an outlet port (22); - A closing section (41) is configured to occupy a closed position and an open position, wherein in the closed position, the closing section (41) closes the corresponding mixing chamber (21) and the corresponding main flow conduit (23), and in the open position, the corresponding mixing chamber (21) and the corresponding main flow conduit (23) are open and accessible for cleaning; - A water supply conduit (28) including a water outlet hole (29) leading to a corresponding first conduit portion (25); - A milk supply conduit (31), the milk supply conduit (31) including a milk outlet hole (35) leading to the corresponding main flow conduit (23); and - An air supply duct (49) is fluidly connected to the corresponding main flow duct (23). The cold milk foaming device (2') is characterized in that the milk outlet hole (35) has a cross-section different from that of the hot milk foaming device (2), and the downstream end of the first conduit portion (25) of the cold milk foaming device (2') has a cross-section different from that of the downstream end of the first conduit portion (25) of the hot milk foaming device (2).

2. The milk foaming system (2) according to claim 1, wherein, The milk outlet hole (35) of the cold milk foaming device (2') has a cross-sectional area that is larger than that of the milk outlet hole (35) of the hot milk foaming device (2).

3. The milk foaming system (2) according to claim 2, wherein, The ratio of the cross-section of the milk outlet hole (35) of the cold milk foaming device (2') to the cross-section of the milk outlet hole (35) of the hot milk foaming device (2) is greater than 2.

4. The milk foaming system (2) according to any one of claims 1 to 3, wherein, The downstream end of the first conduit portion (25) of the cold milk foaming device (2') has a cross-section smaller than that of the downstream end of the first conduit portion (25) of the hot milk foaming device (2).

5. The milk foaming system (2) according to claim 4, wherein, The ratio of the cross-section of the downstream end of the first conduit portion (25) of the hot milk foaming device (2) to the cross-section of the downstream end of the first conduit portion (25) of the cold milk foaming device (2') is greater than 1.

1.

6. The milk foaming system (2) according to any one of claims 1 to 5, wherein, Each first conduit section (25) has a passing cross section that decreases along the direction of the corresponding cross section limiter (24), and each second conduit section (26) has a passing cross section that increases along the direction of the corresponding mixing chamber (21).

7. The milk foaming system (2) according to claim 6, wherein, The taper of the second conduit portion (26) of the cold milk foaming device (2') is smaller than that of the second conduit portion (26) of the hot milk foaming device (2).

8. The milk foaming system (2) according to any one of claims 1 to 7, wherein, The width of the upstream end of the second conduit portion (26) of the cold milk foaming device (2') is greater than the width of the upstream end of the second conduit portion (26) of the hot milk foaming device (2).

9. The milk foaming system (2) according to any one of claims 1 to 8, wherein, The minimum height of the second conduit portion (26) of the cold milk foaming device (2') is greater than the minimum height of the second conduit portion (26) of the hot milk foaming device (2).

10. The milk foaming system (2) according to any one of claims 1 to 9, wherein, The width of the downstream end of the first conduit portion (25) of the cold milk foaming device (2') is smaller than the width of the downstream end of the first conduit portion (25) of the hot milk foaming device (2).

11. The milk foaming system (2) according to any one of claims 1 to 10, wherein, The air supply duct (49) of the cold milk foaming device (2') has a cross-section that is larger than that of the air supply duct (49) of the hot milk foaming device (2).

12. The milk foaming system (2) according to any one of claims 1 to 11, wherein, For the cold milk foaming device (2'), the ratio of the cross-section of the milk outlet hole (35) to the cross-section of the downstream end of the first conduit portion (25) is greater than 3.

13. The milk foaming system (2) according to any one of claims 1 to 12, wherein, Each mixing chamber (21) is cyclone-type and is configured to extend substantially vertically, with each main flow conduit (3) leading to the upper part of the corresponding mixing chamber (21) and the outlet port (22) of each mixing chamber (21) located in the lower part of the mixing chamber (21).

14. The milk foaming system (2) according to any one of claims 1 to 13, wherein, Each of the hot and cold milk foaming devices (2, 2') includes a milk reservoir (4) with an upper filling opening (5) and each mixing portion (6) is arranged at the corresponding upper filling opening (5).

15. A beverage dispensing device (3) comprising a water outlet end (308) and a milk foaming system (2) according to any one of claims 1 to 14, wherein a water supply conduit (28) of each of the hot and cold milk foaming devices (2, 2') is configured to be fluidly connected to the water outlet end (308).

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