Milk frothing device

Abstract

The milk frothing device (2) of the invention comprises a mixing portion (6) comprising a main flow conduit (23) provided with a cross-section restriction (24) and a mixing chamber (21) fluidically connected to the main flow conduit (23), a closing portion configured to close the mixing chamber (21) and the main flow conduit (23), a water supply conduit comprising a water outlet orifice (29) opening into the main flow conduit (23), a milk supply conduit comprising a milk outlet orifice (35) opening into the main flow conduit (23) and having a passage cross-section greater than the passage cross-section of a downstream end of a first conduit portion belonging to the main flow conduit (23) and upstream of the cross-section restriction (24), and an air supply conduit fluidically connected to the main flow conduit (23).

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. Summary of the Invention

[0006] The present invention aims to overcome all or part of these disadvantages.

[0007] The technical problem upon which this invention is based is particularly to provide a milk foaming system that can be easily disassembled and cleaned, while allowing the preparation of cold beverages based on milk foam.

[0008] Therefore, the present invention relates to a milk frothing device for use in conjunction with beverage dispensing equipment, the milk frothing 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, and a second conduit portion; the first conduit portion being located upstream of the cross-sectional constraint and extending to the cross-sectional constraint; and the second conduit portion being 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, which is fluidly connected to the main flow duct. The milk outlet hole has a cross-sectional area that is larger than the cross-sectional area of ​​the downstream end of the first conduit portion.

[0009] This construction of the mixing section, and in particular the main flow conduit and the milk outlet orifice, ensures a significantly greater milk suction flow rate in the main flow conduit (compared to prior art milk foaming devices). This allows for a significant reduction in the heating of the milk by the steam flowing in the main flow conduit, and thus the generation of milk foam that is essentially at ambient temperature, also known as cold milk foam.

[0010] Therefore, the milk foaming device according to the present invention can be easily disassembled and cleaned, while allowing the preparation of cold beverages based on milk foam.

[0011] The milk frothing device may also have one or more of the following features, which may be used alone or in combination.

[0012] 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.

[0013] According to one embodiment of the present invention, the ratio of the cross-sectional area of ​​the milk outlet orifice to the cross-sectional area of ​​the downstream end of the first conduit portion is greater than 3. This value of the ratio implies that the downstream end of the first conduit portion is designed to be too small and the milk outlet orifice is designed to be too large. This results in increased head loss within the first conduit portion and increased milk flow rate within the main flow conduit. Therefore, this value of the ratio allows for further reduction in the heating of the milk by the steam flowing in the main flow conduit.

[0014] According to one embodiment of the invention, the ratio of the cross-section of the milk outlet hole to the cross-section of the downstream end of the first conduit portion is between 3 and 40, advantageously between 3.5 and 31, and for example equal to about 10.5 or 14.5.

[0015] According to one embodiment of the invention, the milk outlet orifice has a diameter between 3 mm and 6 mm, and for example equal to 4.3 mm. This size design of the milk outlet orifice allows for a further increase in the milk suction flow rate in the main flow conduit, and thus a further reduction in the heating of the milk by the steam flowing in the main flow conduit.

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

[0017] In other words, the main flow conduit is configured such that the flow of water in the main flow conduit from the water outlet to the mixing chamber 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. This configuration of the milk frothing device allows control over the amount of air and milk entering the mixing chamber without the need for complex and expensive entry devices.

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

[0019] According to one embodiment of the present invention, the downstream end of the first catheter portion has a diameter between 0.5 mm. 2 Up to 2mm 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 section allows for increased head loss within the first conduit section, and thus increased negative pressure at the cross-sectional limit and consequently at the milk outlet.

[0020] According to one embodiment of the present invention, the upstream end of the second catheter portion has a diameter between 2 mm. 2 Up to 18 mm 2 Between, advantageously between 3 mm 2 Up to 15 mm 2 Between and, for example, between 6mm 2 Up to 11 mm 2 The cross section between them.

[0021] According to one embodiment of the present invention, the first conduit portion has a generally rectangular cross-section.

[0022] According to one embodiment of the invention, the downstream end of the first conduit portion has a width between 0.4 mm and 2 mm, and for example equal to 1 mm.

[0023] According to one embodiment of the invention, the downstream end of the first conduit portion has a height between 0.6 mm and 1.5 mm, and for example equal to 0.8 mm or 1.2 mm.

[0024] According to one embodiment of the invention, the second conduit portion has a generally rectangular cross-section.

[0025] According to one embodiment of the invention, the upstream end of the second conduit portion has a height between 1.5 mm and 3.5 mm, advantageously between 1.8 mm and 2.8 mm, and for example equal to 2.3 mm.

[0026] According to one embodiment of the invention, the upstream end of the second conduit portion has a width between 2 mm and 5 mm, and for example equal to 3.5 mm or 4 mm.

[0027] According to one embodiment of the present invention, the downstream end of the second conduit portion has a width between 2 mm and 6 mm.

[0028] According to one embodiment of the invention, the bottom wall of the second conduit portion 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 mixing chamber.

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

[0030] According to one embodiment of the invention, the second conduit portion includes two sidewalls that are parallel or divergent along the direction of the mixing chamber, and the two sidewalls are inclined relative to each other at an angle between 0° and 20°, and advantageously between 0° and 10°.

[0031] According to one embodiment of the invention, the main flow conduit is entirely defined by the mixing portion and the closing portion. Therefore, the milk proteins contained in the milk flowing in the main flow conduit cannot alter the geometry of the main flow conduit, and thus will not affect the amount of air introduced into the mixing chamber.

[0032] According to one embodiment of the invention, the milk frothing device includes an airflow regulating device configured to regulate the airflow rate flowing in the air supply duct. This configuration of the milk frothing device according to the invention, and more specifically, the presence of the airflow regulating device, allows a 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 rate introduced into the mixing chamber to obtain more or less stable milk foam.

[0033] According to one embodiment of the present invention, the 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 flow regulating member.

[0034] This configuration of the airflow regulating device allows for easy adjustment of the amount of air introduced into the main flow duct by displacing the flow regulating member to an adjustment position corresponding to the desired foam consistency.

[0035] According to one embodiment of the present invention, the flow regulating member is displaceable between a maximum regulating position and a minimum regulating position, wherein the cross-section of the airflow passage is at its maximum at the maximum regulating position and at its minimum regulating position.

[0036] According to one embodiment of the invention, the sealing element is fixed to the flow regulating member. This arrangement of the sealing element allows for easy installation of the air flow regulating device.

[0037] According to one embodiment of the invention, the 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 this calibrated air passage allows excessive air to be prevented from entering the mixing chamber, and thus avoids obtaining over-aerated and / or milk foam with large-diameter bubbles.

[0038] According to one embodiment of the invention, the calibration air passage is located downstream of the airflow regulating device, and for example, downstream of the airflow passage.

[0039] According to one embodiment of the present invention, the airflow regulating device includes at least one air inlet opening, and the airflow passage is configured to fluidly connect the at least one air inlet opening to the calibrated air passage.

[0040] According to one embodiment of the present invention, the airflow regulating device includes a support portion fixed to the closing portion and configured to support the flow regulating member, the flow regulating member being mounted to move relative to the support portion.

[0041] According to one embodiment of the invention, the support portion includes an insertion hole, and the airflow regulating device further includes a passage limiting member at least partially received in the insertion hole, the insertion hole and the passage limiting member defining the calibration air passage. This configuration of the calibration air passage allows for easy cleaning of the milk frothing device, and particularly the calibration 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 the calibration air passage substantially limits the risk of blockage, because the continuous movement of the flow regulating member along the displacement direction results in the discharge of any particles, such as dust particles, retained in the calibration air passage.

[0042] According to one embodiment of the present invention, the passage limiting member moves integrally with the flow regulating member. Therefore, the passage limiting member is installed to move along the displacement direction within the insertion hole.

[0043] According to one embodiment of the present invention, the sealing element and the support portion define the airflow passage.

[0044] According to one embodiment of the invention, the support portion includes an example support surface, which is disposed, for example, on the upper end surface of the support portion. The support surface is annular, and the sealing element is compressible against the support surface.

[0045] According to one embodiment of the invention, the support portion includes a passage groove disposed in the support surface provided on the support portion, and the passage groove partially defines the airflow passage. The passage groove may extend substantially radially, for example, relative to the central axis of the support surface.

[0046] According to one embodiment of the invention, the insertion hole has a diameter greater than 1 mm, preferably greater than 1.5 mm. The insertion hole may, for example, have a diameter between 1.5 mm and 2 mm, advantageously between 1.7 mm and 1.9 mm, and for example equal to about 1.8 mm.

[0047] According to one embodiment of the invention, the mixing portion includes an upper surface, the main flow conduit is disposed in the upper surface, and the mixing chamber opens to the upper surface.

[0048] According to one embodiment of the invention, the shut-off portion includes the air supply conduit. This arrangement of the air supply conduit allows for a significant limitation of the risk of spoilage caused by milk proteins contained in the milk flowing in the main flow conduit, and thus ensures a controlled amount of air entering the mixing chamber.

[0049] According to one embodiment of the invention, the mixing portion at least partially includes the milk supply conduit.

[0050] According to one embodiment of the invention, the milk supply conduit includes a calibrated flow path configured to define a predetermined milk flow rate within the milk supply conduit. These arrangements allow a predetermined amount of milk to enter the mixing chamber, thereby obtaining milk foam with appropriate consistency.

[0051] According to one embodiment of the present invention, the milk foaming device includes a sealing joint disposed in an engagement area between the mixing section and the closing section, the sealing joint extending around the mixing chamber and the main flow conduit.

[0052] According to one embodiment of the invention, each mixing section includes an air inlet channel configured to be closed by the closing section, the air inlet channel connecting the air supply conduit to the main flow conduit. Advantageously, the sealing joint extends around the air inlet channel.

[0053] According to one embodiment of the invention, the air inlet channel leads to the main flow duct near the cross-sectional limiting member.

[0054] According to one embodiment of the invention, the air inlet channel is disposed in the upper surface of the mixing portion.

[0055] According to one embodiment of the invention, the main flow conduit, and more specifically the second conduit portion, is configured to allow water, milk, and air from the water outlet, the milk supply conduit, and the air inlet channel to mix for the first time before they reach the mixing chamber.

[0056] According to one embodiment of the invention, the mixing chamber is cyclone-shaped and configured to extend substantially vertically, the main flow conduit leads to the upper part of the mixing chamber, and the outlet orifice of the mixing chamber is located in the lower part of the mixing chamber. This configuration of the mixing chamber facilitates the mixing of air, milk, and hot water, cold water, or steam introduced into the mixing chamber.

[0057] According to one embodiment of the invention, the closed portion is configured to cover the mixing portion.

[0058] According to one embodiment of the invention, the milk foaming device includes a milk reservoir with an upper filling opening, the mixing portion being disposed at the upper filling opening and, for example, at least partially contained within the milk reservoir.

[0059] According to one embodiment of the invention, the milk supply conduit includes a milk suction tube that extends substantially vertically and leads to the lower part of the milk storage container.

[0060] According to one embodiment of the invention, the milk frothing device includes a milk pouring conduit that is fluidly connected to the outlet hole of the mixing chamber and configured to be vertically positioned above a container, such as a cup.

[0061] According to one embodiment of the invention, the mixing portion is configured to at least partially close the milk storage container and is configured to be removable relative to the milk storage container.

[0062] According to one embodiment of the invention, the mixing portion forms a lid, the lid being configured to close the milk storage container.

[0063] According to one embodiment of the invention, the milk frothing device includes a holding system configured to hold the closed portion in a closed position. This configuration of the holding system allows for the prevention of untimely displacement of the closed portion toward the open position.

[0064] According to one embodiment of the invention, the retaining system is configured to removably, that is, temporarily and reversibly, fix the closing portion to the mixing portion.

[0065] According to one embodiment of the invention, the retaining system is configured to abut the closing portion against the mixing portion when the closing portion is in the closed position, thereby compressing the sealing joint, and more specifically, the sealing lip of the sealing joint. This configuration of the retaining system allows for improved efficiency of the sealing joint and thus limits the risk of fluid leakage at the sealing joint.

[0066] According to one embodiment of the invention, the milk foaming device includes a fixing system configured to removably, that is, temporarily and reversibly fix the mixing portion to the milk storage container.

[0067] 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 device according to the invention, the water supply conduit of the milk frothing device being configured to be fluidly connected to the water outlet end.

[0068] 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.

[0069] 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

[0070] 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.

[0071] Figure 1 This is a three-dimensional top view of the milk foaming device according to the present invention.

[0072] Figure 2 yes Figure 1 A top view of a milk foaming device.

[0073] Figure 3 yes Figure 1 A longitudinally truncated perspective view of a milk foaming device.

[0074] Figure 4 yes Figure 1 A three-dimensional view of the sealing joint of the milk foaming device.

[0075] Figure 5 yes Figure 1 A partial three-dimensional top view of a milk foaming device.

[0076] Figure 6 yes Figure 1 A partial three-dimensional top view of the milk foaming device, in which a sealing joint has been placed.

[0077] Figure 7 yes Figure 1 A three-dimensional top view of the mixing and closing parts of a milk frothing device.

[0078] Figure 8 yes Figure 1 An exploded three-dimensional diagram of a milk foaming device.

[0079] Figure 9 It is equipped with Figure 4 A partial three-dimensional top view of the mixed part of the sealing joint.

[0080] Figure 10 It is equipped with Figure 4 A magnified top view of the mixing section of the sealing joint.

[0081] Figure 11 yes Figure 1 A partial perspective view of the milk foaming device cut longitudinally.

[0082] Figure 12 yes Figure 1 A three-dimensional bottom view of a sub-component of a milk foaming device.

[0083] Figure 13 It belongs to Figure 1 A three-dimensional top view of the locking part of the milk foaming device.

[0084] Figure 14 This is a partial top view of the mixed section.

[0085] Figure 15 yes Figure 1 A cross-sectional view of a milk foaming device.

[0086] Figure 16 It belongs to Figure 1 A partial three-dimensional top view of the airflow regulating device of the milk foaming device.

[0087] Figure 17 It belongs to Figure 15 A three-dimensional top view of the support part of the airflow regulating device.

[0088] Figure 18 It belongs to Figure 16 A three-dimensional top view of the support part and passage restriction component of the airflow regulating device.

[0089] Figure 19 yes Figure 16 A partial three-dimensional top view of the airflow regulating device.

[0090] Figure 20 yes Figure 16 A longitudinal sectional view of the airflow regulating device.

[0091] Figure 21 It is equipped with Figure 1 A 3D diagram of an automatic coffee machine with a milk frothing device. Detailed Implementation

[0092] 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.

[0093] 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.

[0094] Unless otherwise specified, the term “substantially” in this document means “precise or within 10% or 10° of the exact value”.

[0095] Figures 1 to 20 A milk frothing device 2 is shown, which is used in conjunction with a beverage dispensing device 3 (see...). Figure 21 For example, it can work in conjunction with a coffee machine such as an automatic coffee machine. As a variation, the beverage dispensing device 3 can be a water dispenser, and especially a hot water or tea dispenser.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The milk frothing device 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 milk reservoir 4. The milk reservoir 4 may have, for example, a rectangular, circular, or elliptical cross-section.

[0101] The milk foaming device 2 also includes a mixing section 6, which is arranged at the upper filling opening 5.

[0102] According to the embodiment shown in the figure, the mixing part 6 includes a closing body 7 configured to close the milk reservoir 4 and to be removable relative to the milk reservoir 4. More specifically, the closing body 7 is configured to be housed in the upper part of the milk reservoir 4 and to be inserted into the milk reservoir 4 through the upper filling opening 5 of the milk reservoir 4.

[0103] Advantageously, the closing body 7 is configured to remain stationary relative to the milk storage container 4 when it is housed within the milk storage container 4. For this purpose, the closing body 7 advantageously has a rectangular cross-section.

[0104] According to the embodiment shown in the figure, the closing body 7 includes a lower body 7.1 (see figure 7.1). Figure 14 ) and the upper main body 7.2 (see Figure 8 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.

[0105] like Figure 14 As shown, the milk foaming device 2 includes a fixing device 9 configured to removably, that is, temporarily and reversibly fix the mixing portion 6, more specifically the closing body 7, to the milk storage container 4.

[0106] According to the embodiment shown in the figure, the fixing device 9 includes a plurality of locking members 11, such as locking fingers, housed in the internal receiving portion 8. Each locking member 11 is more specifically configured to protrude beyond the closing body 7 through a corresponding through opening 12 leading to the outer peripheral surface of the closing body 7.

[0107] The fixing device 9 also includes a plurality of locking elements 13 disposed on the milk reservoir 4 and near the upper filling opening 5. According to the embodiment shown in the figures, each locking element 13 is formed by a locking hole configured to receive a corresponding locking member 11 when the closing body 7 is fixed to the 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 milk reservoir 4.

[0108] More specifically, the locking member 11 is mounted to slide relative to the 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 closing body 7 through a corresponding through opening 12 and is configured to cooperate with a corresponding locking element 13 to secure the closing body 7 to the milk reservoir 4. In the released position, each locking member 11 is configured to release the corresponding locking element 13, allowing the closing body 7 to be removed from the milk reservoir 4. Advantageously, the sliding direction D1 extends substantially orthogonally to the central axis of the closing body 7.

[0109] Each locking member 11 may be configured, for example, to retract into place from the outer peripheral surface of the closing body 7 or to be flush with the outer peripheral surface when the locking member 11 is in the released position.

[0110] More specifically, Figure 14 As shown, the milk frothing device 2 includes an actuation mechanism 14, which is disposed on the closing body 7 and configured to displace the locking member 11 to the release position when the actuation mechanism 14 is actuated by the user.

[0111] The actuation mechanism 14 more specifically includes an actuation member 15, such as an actuation button, which can be manually actuated by a user and is configured to displace the locking member 11 from a locked position to a released position. Advantageously, the actuation member 15 is mounted to slide relative to the closing body 7 along a sliding direction D1 between a first actuation position and a second actuation position. The actuation mechanism 14 and the locking member 11 are more specifically configured such that displacement of the actuation member 15 from the first actuation position to the second actuation position causes displacement of the locking member 11 from the locked position to the released position.

[0112] According to the embodiment shown in the figure, the actuation mechanism 14 includes two connecting members 16, which are housed in the internal receiving portion 8 and are each configured to mechanically connect the actuating member 15 to a corresponding locking member 11. Each connecting member 16 includes: a first end portion on which the actuating member 15 is hingedly mounted about a first hinge axis; a second end portion on which a corresponding locking member 11 is hingedly mounted about a second hinge axis; and an intermediate portion mounted to rotate relative to the closing body 7 about a rotation axis that is substantially parallel to the corresponding first and second hinge axes.

[0113] More specifically, the actuation mechanism 14 is configured such that displacement of the actuating member 15 from the first actuating position to the second actuating position causes pivoting of the two connecting members 16 along the first pivoting direction and displacement of the two locking members 11 from the locked position to the released position, and displacement of the actuating member 15 from the second actuating position to the first actuating position causes pivoting of the two connecting members 16 along the second pivoting direction and displacement of the two locking members 11 from the released position to the locked position.

[0114] Advantageously, the actuation mechanism 14 includes a reset element 17, such as a reset spring, which is configured to reset the actuation mechanism 15 to a first actuation position and thus to reset the two locking members 11 to a locked position.

[0115] According to the embodiment shown in the figure, the mixing part 6 also includes a mixing body 18, which is fastened to the closing body 7, for example, by a snap-fit. More specifically, the mixing body 18 has a generally flat upper surface 19.

[0116] The mixing body 18 also includes a mixing chamber 21, also called a homogenization chamber, which opens to the upper surface 19 of the mixing body 18 and is equipped with an outlet orifice 22. The 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 mixing chamber 21. According to the embodiment shown in the figures, the mixing chamber 21 is cyclone-type and configured to extend vertically, and the main flow conduit 23 opens tangentially into the mixing chamber 21. Advantageously, the main flow conduit 23 opens to the upper part of the mixing chamber 21, and for example to the high point of the mixing chamber 21, and the outlet orifice 22 is located in the lower part of the mixing chamber 21, and for example at the low point of the mixing chamber 21.

[0117] More specifically, Figure 9As shown, the 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 cross-sectional limiting member 24 and extending to the cross-sectional limiting member 24; and a second conduit portion 26 located downstream of the cross-sectional limiting member 24 and extending from the cross-sectional limiting member 24 to the mixing chamber 21. Advantageously, the first conduit portion 25 has a passing cross-section that decreases along the direction of the cross-sectional limiting member 24. The second conduit portion 26 has a passing cross-section that increases along the direction of the mixing chamber 21.

[0118] According to the embodiment shown in the figure, the second conduit portion 26 includes two sidewalls that radiate along the direction of the mixing chamber 21 and are inclined relative to each other at an angle between 0° and 20°, advantageously between 0° and 10°, and for example about 4°.

[0119] like Figure 9 As shown, the second conduit portion 26 includes a bottom wall having at least one surface portion that is inclined relative to a 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°.

[0120] According to the embodiment shown in the figure, the first conduit portion 25 has a generally rectangular cross-section, and the second conduit portion 26 also has a generally rectangular cross-section.

[0121] The downstream end of the first catheter portion 25 may, for example, have a width between 0.4 mm and 2 mm and a height between 0.6 mm and 1.5 mm, while the upstream end of the second catheter portion 26 may, for example, have a width between 2 mm and 5 mm and a height between 1.8 mm and 2.8 mm. According to one embodiment of the invention, the downstream end of the first catheter portion 25 has a width equal to 1 mm and a height equal to 0.8 mm, while the upstream end of the second catheter portion 26 has a width equal to 3.5 mm and a height equal to 2.3 mm. According to another embodiment of the invention, the downstream end of the first catheter portion 25 has a width equal to 1 mm and a height equal to 1.2 mm, while the upstream end of the second catheter portion 26 has a width equal to 4 mm and a height equal to 2.3 mm.

[0122] The downstream end of the first catheter portion 25 may, for example, have a diameter between 0.5 mm. 2 Up to 2 mm 2 Between and advantageously between 0.75 mm 2 Up to 1.3 mm 2The cross-section between them, and the upstream end of the second conduit portion 26 may, for example, have a cross-section between 2 mm. 2 Up to 18 mm 2 Between, advantageously between 3mm 2 Up to 15 mm 2 Between and, for example, between 6 mm 2 Up to 11 mm 2 The cross section between them.

[0123] The 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 produce hot water and / or steam. Advantageously, the connecting end piece 27 extends radially relative to the central axis of the mixing body 18, and is configured to extend radially relative to the central axis of the milk storage tank 4.

[0124] Mixing section 6 also includes water supply conduit 28 (see Figure 11 The water supply conduit 28 is fluidly connected to the connecting end 27, and the water supply conduit 28 is provided with a water outlet hole 29, which leads to the first conduit portion 25 and is more specifically opposite the mixing chamber 21. Advantageously, the water supply conduit is a hot water / steam supply conduit.

[0125] Therefore, the main flow conduit 23 is configured to fluidly connect the water outlet orifice 29 to the mixing chamber 21, and is configured to allow hot water, cold water, or steam to flow into the main flow conduit 23 and into the mixing chamber 21.

[0126] The milk foaming device 2 also includes a milk supply conduit 31, which is fluidly connected to the main flow conduit 23 and is thus configured to be fluidly connected to the mixing chamber 21 via the main flow conduit 23.

[0127] More specifically, Figure 3 As shown, the milk supply conduit 31 includes: a milk suction tube 32 fixed to the mixing section 6 (and more specifically to the mixing body 18), configured to extend vertically and lead to the lower part of the milk reservoir 4; and a calibrated flow passage 33 defined by the mixing body 18 and fluidly connected to the milk suction tube 32, for example via a connecting conduit 34. Therefore, the calibrated flow passage 33 is located downstream of the milk suction tube 32 and is configured to define a predetermined milk flow rate in the milk supply conduit 31.

[0128] The calibrated flow path 33 more specifically includes a milk outlet orifice 35, which leads to the main flow conduit 23 at the cross-sectional constraint 24. Advantageously, the milk outlet orifice 35 has a circular cross-section and a diameter between 3 mm and 6 mm, and for example equal to 4.3 mm.

[0129] More specifically, the milk outlet orifice 35 has a cross-sectional area larger than that of the downstream end of the first conduit portion 25. Advantageously, the ratio of the cross-sectional area of ​​the milk outlet orifice 35 to that of the downstream end of the first conduit portion is between 3 and 40, and advantageously between 3.5 and 31. Such a ratio may, for example, be equal to about 10.5 or 14.5.

[0130] This construction of the downstream end of the first conduit section 25 and the milk outlet hole 35 ensures a significantly greater milk suction flow rate in the main flow conduit 23 (relative to prior art milk foaming devices), 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.

[0131] According to the embodiment shown in the figure, the 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 the main flow conduit 23 at the cross-sectional limiting member 24. Therefore, the air inlet channel 36 is configured to be fluidly connected to the mixing chamber 21 via the main flow conduit 23.

[0132] The aforementioned cross-sectional limiting member 24 causes an increase in the velocity of the steam flowing in the main flow conduit 23, which generates negative pressure in the milk supply conduit 31 and the air inlet channel 36. Therefore, the cross-sectional limiting member 24 is more specifically configured to form a milk and air suction system based on the Venturi effect. Thus, the main flow conduit 23 is configured such that the flow of hot water, cold water, or steam from the water outlet 29 to the mixing chamber 21 generates negative pressure in the milk supply conduit 31 and in the air inlet channel 36, thereby causing milk and air to be drawn into the main flow conduit 23 and the drawn milk and air to flow into the mixing chamber 21. Furthermore, the second conduit portion 26, having a 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, milk supply conduit 31, and air inlet channel 36 before they reach the mixing chamber 21, where homogenization of the mixture is achieved, particularly through cyclonic motion. Therefore, the second conduit portion 26 forms a first mixing zone in which the first mixing takes place, and the mixing chamber 21 forms a second mixing zone in which the mixing that began in the first mixing zone continues.

[0133] The mixing section 6 also includes a milk pouring conduit 37, which is fluidly connected to the outlet port 22 of the mixing chamber 21 and 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, the milk pouring conduit 37 is configured to extend radially relative to the central axis of the milk reservoir 4.

[0134] More specifically, Figure 4 and Figure 9 As shown, the milk foaming device 2 includes a sealing joint 38 that extends around the mixing chamber 21, the main flow conduit 23, and the air inlet channel 36. For this purpose, the mixing body 18 includes a receiving groove 39 disposed in the upper surface 19 of the mixing body 18, and the sealing joint 38 is received in the receiving groove 39.

[0135] According to the embodiment shown in the figure, the sealing joint 38 includes: a joint body 38.1 integrally received in a receiving groove 39; and a sealing lip 38.2 extending along the joint body 38.1 and protruding beyond the receiving groove 39. Advantageously, the sealing joint 38 is continuous.

[0136] The milk frothing device 2 also includes a closing portion 41 configured to cover the mixing body 18 and to abut against the mixing body 18.

[0137] like Figure 3 As shown, the closing portion 41 is generally flat, and the sealing joint 38 is therefore arranged in the engagement area between the mixing portion 6 and the closing portion 41, which is generally flat.

[0138] More specifically, the closing portion 41 is installed to move relative to the mixing portion 6 between a closed position and an open position. In the closed position, the closing portion 41 closes the mixing chamber 21, the main flow duct 23, and the air inlet channel 36. In the open position, the mixing chamber 21, the main flow duct 23, and the air inlet channel 36 are open and accessible for cleaning.

[0139] Advantageously, the milk frothing device 2 includes a holding system 42 (see Figure 11 The retaining system 42 is configured to hold the closing portion 41 in the closed position and to ensure that the sealing joint 38 is compressed when the closing portion 41 is in the closed position. More specifically, the retaining system 42 is configured to cause the closing portion 41 to abut against the upper surface 19 of the mixing body 18 when the closing portion 41 is in the closed position, so as to compress the sealing joint 38, and more specifically, to compress the sealing lip 38.2 of the sealing joint 38. According to the embodiment shown in the figure, the retaining system 42 is also configured to removably, that is, temporarily and reversibly secure the closing portion 41 to the mixing portion 6.

[0140] like Figure 3 As shown, the retaining system 42 includes a locking portion 43, such as a locking ring, which is mounted to rotate relative to the 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 closing portion 41 to displace toward the open position, and in the locked position, the locking portion 43 prevents the closing portion 41 from displacing toward the open position. When the mixing portion 6 is housed in the 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 milk reservoir 4.

[0141] According to the embodiment shown in the figure, the 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 sealing joint 38 and is thus positioned facing the mixing chamber 21 and the main flow conduit 23 and spaced apart from the mixing portion 6. The holding system 42 is configured to displace the closing portion 41 from the intermediate position to the closed position along the direction of the mixing portion 6 when the locking portion 43 is displaced from the release position to the locking position, and thus is configured to bring the closing portion 41 close to the mixing portion 6.

[0142] like Figure 5 and Figure 12 As shown, the retaining system 42 further includes: a plurality of fixing members 44, such as fixing ramps or fixing grooves, which are disposed on the mixing body 18 and distributed around the central axis of the mixing body 18; and a plurality of fixing elements 45, such as fixing lugs, which are disposed on the locking portion 43 and distributed around the rotation axis A. The fixing elements 45 are configured to cooperate with the fixing members 44 disposed on the mixing body 18 when the locking portion 43 is rotated from the release position to the locking position, so as to displace the locking portion 43 in the direction of the mixing portion 6. The fixing members 44 and fixing elements 45 can, for example, form a bayonet-type or screw-nut type fixing system. According to the embodiment shown in the figure, the fixing members 44 are disposed on the outer surface of the mixing body 18, and the fixing elements 45 are disposed on the inner surface of the locking portion 43.

[0143] Advantageously, the locking portion 43 includes a support surface 46 (see especially) Figure 11The support surface 46 extends transversely to the axis of rotation A, and is configured to displace the closing portion 41 toward the 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, the support surface 46 is configured to slide on the closing portion 41 when the locking portion 43 rotates between the release position and the locking position. Advantageously, the support surface 46 is annular and configured to abut against the peripheral edge of the closing portion 41.

[0144] According to one embodiment of the present invention, the locking portion 43 can be non-removably mounted on the closing portion 41, such that the locking portion 43 and the closing portion 41 form a non-removable sub-assembly.

[0145] like Figure 6 and Figure 12 As shown, the milk frothing device 2 includes a translational guide device configured to guide the closing portion 41 to translate relative to the mixing portion 6 along a translational direction D2 when the closing portion 41 is displaced between an intermediate position and a closed position. This translational direction D2 is, for example, perpendicular to the engagement area and therefore parallel to the rotation axis A. The translational guide device may include, for example, two guide members 47, such as guide posts, disposed on the closing portion 41; and two guide elements 48, such as guide holes, disposed on the mixing body 18 and capable of receiving the two guide members 47 respectively.

[0146] More specifically, Figure 20 As shown, the shut-off portion 41 further includes: an air supply duct 49 connected to the main flow duct 23 via an air inlet channel 36; and an air flow regulating device 51 configured to regulate the air flow rate in the air supply duct 49. However, according to a variation of the invention, the mixing portion 6 may not have an air inlet channel 36, and the air supply duct 49 may be directly connected to the main flow duct 23.

[0147] According to the embodiment shown in the figure, the airflow regulating device 51 includes: a support portion 52 fixed to the closing portion 41 and protruding from the upper surface of the closing portion 41; and a flow regulating member 53, such as a flow regulating button, which is supported by the support portion 52 and mounted to move relative to the 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 milk frothing device 2 is placed on a horizontal surface.

[0148] The flow regulating member 53 and the support portion 52 may extend coaxially relative to each other, for example, and the support portion 52 may include, for example, two guide fingers 54 (see in particular). Figure 16 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 flow regulating member 53.

[0149] According to the embodiment shown in the figure, the flow regulating member 53 includes an regulating portion 53.1 configured to cover the support portion 52, and the regulating portion 53.1 includes an upper wall covering the support portion 52 and a peripheral wall having a generally tubular shape and extending around the support portion 52. More specifically as Figure 1 and Figure 20 As shown, the flow regulating member 53 also includes an operating part 53.2, which is integrated with the regulating part 53.1 and configured to be operated by the user to displace the flow regulating member 53 along the displacement direction D3.

[0150] The flow regulating member 53 is configured to occupy multiple regulating positions offset from each other along the displacement direction D3. Advantageously, when the mixing part 6 is housed in the milk storage tank 4 and the closing part 41 is in the closed position, the displacement direction D3 is substantially parallel to the central axis of the milk storage tank 4.

[0151] The airflow regulating device 51 also includes a sealing element 56, which is annular and fixed to the flow regulating member 53. According to the embodiment shown in the figure, the support portion 52 includes a support surface 57 disposed on the upper end surface of the support portion 52, which is annular, and the sealing element 56 can be compressed against the support surface 57 according to the position occupied by the flow regulating member 53.

[0152] The sealing element 56 and the support portion 52 are configured to define an airflow passage 58 (see Figure 19 The airflow passage 58 has a cross-section that varies depending on the position occupied by the flow regulating member 53. More specifically, the airflow passage 58 is configured to fluidly connect an air inlet opening 59, defined by the air flow regulating device 51, to an air supply duct 49. According to the embodiment shown in the figure, the air inlet opening 59 is defined by a functional gap between the flow regulating member 53 and the support portion 52.

[0153] More specifically, the flow regulating member 53 can be displaced between a maximum regulating position and a minimum regulating position, in which the cross-section of the airflow passage 58 is at its maximum and in which the cross-section of the airflow passage 58 is at its minimum.

[0154] like Figure 18As shown, the support portion 52 includes a passage groove 61 disposed in the support surface 57, and the passage groove 61 partially defines an airflow passage 58. The passage groove 61 may extend radially, for example, relative to the displacement direction D3, and have a generally V-shaped cross-section. The flow regulating device may be configured, for example, such that when the flow regulating member 53 is in its minimum regulating position, the sealing element 56 cannot completely close the passage groove 61 and allows minimal airflow through the airflow passage 58.

[0155] More specifically, Figure 20 As shown, the air supply duct 49 includes a calibration air passage 62 located downstream of the flow regulating member 53, and the calibration air passage 62 is configured to limit the maximum air flow in the air supply duct 49.

[0156] According to the embodiment shown in the figure, the 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 the 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 insertion hole 63. The passage limiting member 64 is integrally movable with the flow regulating member 53 and is thus mounted to move within the insertion hole 63 along the displacement direction D3. Advantageously, the passage limiting member 64 is elongated and extends in an extension direction parallel to the displacement direction D3. The insertion hole 63 and the passage limiting member 64 more specifically define a calibrated air passage 62 such that the calibrated air passage 62 is annular.

[0157] According to the embodiment shown in the figure, the support portion 52 includes a cavity 65 opening to the upper end surface of the support portion 52, and an insertion hole 63 opening into the cavity. The cavity 65 and the flow regulating member 53 define an inner chamber 66 configured to fluidly connect an airflow passage 58 to the insertion hole 63.

[0158] According to another embodiment of the invention, not shown in the figures, the milk frothing device 2 may not include a milk reservoir. In this embodiment, the 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 the 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 the connecting end 27 and separate from one or more coffee outlet nozzles 304A, 304B.

[0159] 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 device (2) for use in conjunction with a beverage dispensing device (3), the milk frothing device (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) that moves between a closed position and an open position relative to the mixing section (6), wherein in the closed position the closing section (41) closes the mixing chamber (21) and the main flow conduit (23), and in the open position the mixing chamber (21) and the main flow conduit (23) are open and accessible for cleaning; - A water supply conduit (28) including a water outlet hole (29) leading to the first conduit portion (25); - A milk supply conduit (31), the milk supply conduit (31) including a milk outlet (35) leading to the main flow conduit (23); and - An air supply duct (49) is fluidly connected to the main flow duct (23). The milk outlet hole (35) is characterized in that its cross-section is larger than that of the downstream end of the first conduit portion (25).

2. The milk foaming device (2) according to claim 1, wherein, 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.

3. The milk foaming device (2) according to claim 2, wherein, 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.

4. The milk frothing device (2) according to any one of claims 1 to 3, wherein, The milk outlet hole (35) has a diameter between 3 mm and 6 mm.

5. The milk frothing device (2) according to any one of claims 1 to 4, wherein, The first conduit portion (25) has a generally rectangular cross-section.

6. The milk frothing device (2) according to any one of claims 1 to 5, wherein, The downstream end of the first catheter portion (25) has a width between 0.4 mm and 2 mm, and / or the downstream end of the first catheter portion (25) has a height between 0.6 mm and 1.5 mm.

7. The milk frothing device (2) according to any one of claims 1 to 6, wherein, The downstream end of the first catheter portion (25) has a diameter between 0.5 mm. 2 Up to 2 mm 2 The cross section between them.

8. The milk frothing device (2) according to any one of claims 1 to 7, wherein, The second conduit portion (26) has a generally rectangular cross-section.

9. The milk frothing device (2) according to any one of claims 1 to 8, wherein, The upstream end of the second catheter portion (26) has a height between 1.5 mm and 3.5 mm, and / or the upstream end of the second catheter portion (26) has a width between 2 mm and 5 mm.

10. The milk frothing device (2) according to any one of claims 1 to 9, wherein, The upstream end of the second catheter portion (26) has a diameter between 2 mm. 2 Up to 18 mm 2 The cross section between them.

11. The milk frothing device (2) according to any one of claims 1 to 10, wherein, The bottom wall of the second conduit portion (26) includes 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).

12. The milk frothing device (2) according to any one of claims 1 to 11, wherein, The first conduit portion (25) has a passing cross section that decreases along the direction of the cross section limiting member (24), and the second conduit portion (26) has a passing cross section that increases along the direction of the mixing chamber (21).

13. The milk frothing device (2) according to any one of claims 1 to 12, wherein, The mixing chamber (21) is cyclone-type and is configured to extend substantially vertically, the main flow conduit (23) leads to the upper part of the mixing chamber (21), and the outlet hole (22) is located in the lower part of the mixing chamber (21).

14. The milk frothing device (2) according to any one of claims 1 to 13, wherein, The second conduit portion (26) includes two sidewalls that are parallel or divergent along the direction of the mixing chamber (21) and that are inclined relative to each other at an angle between 0° and 20°.

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

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