Milk froth regulating device and coffee machine

Abstract

The utility model discloses a kind of milk froth adjusting device, and coffee machine is disclosed, wherein milk froth adjusting device includes box, box cover assembly and adjusting assembly, box is equipped with the containing cavity for containing milk, box cover assembly includes bottom cover, flexible seal and top cover, bottom cover cover is in containing cavity, bottom cover is equipped with milk froth generation flow channel, milk froth generation flow channel has steam inlet, milk inlet, air inlet and milk froth outlet, milk inlet communicates containing cavity, flexible seal cover is in milk froth generation flow channel, top cover is connected to bottom cover, and flexible seal is located between bottom cover and top cover, adjusting assembly has push pressure part, push pressure part abuts on the side of flexible seal away from bottom cover, adjusting assembly is rotatably arranged in top cover, to increase or reduce the minimum distance between flexible seal and air inlet, the adjustment of the effective opening of air inlet can be realized, and finally obtain milk froth of different size, the demand of different user can be satisfied.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine technology, and in particular to a milk frothing adjustment device and a coffee machine. Background Technology

[0002] In coffee machines, the milk tank assembly uses the machine's steam output to deliver high-temperature steam, which mixes with air entering the assembly from the outside and the milk to create milk foam. However, existing milk tank assemblies cannot control the amount of air entering the machine or adjust the size of the milk foam, thus failing to meet the needs of different users. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a milk frothing regulating device capable of adjusting the air intake, thereby adjusting the size of the milk froth.

[0004] This utility model also proposes a coffee machine having the above-mentioned milk foam adjustment device.

[0005] The milk frothing device according to a first aspect embodiment of the present invention includes: The box body has a receiving cavity for holding milk; A lid assembly includes a bottom cover, a flexible seal, and a top cover. The bottom cover is disposed on the receiving cavity and has a milk foam generating channel. The milk foam generating channel has a steam inlet, a milk inlet, an air inlet, and a milk foam outlet. The milk inlet communicates with the receiving cavity. The flexible seal is disposed on the milk foam generating channel. The top cover is connected to the bottom cover, and the flexible seal is located between the bottom cover and the top cover. An adjustment assembly has a pushing part that abuts against the side of the flexible seal opposite to the bottom cover. The adjustment assembly is rotatably disposed on the top cover to increase or decrease the minimum distance between the flexible seal and the air inlet.

[0006] The milk frothing device according to the first aspect of the present invention has at least the following beneficial effects: During milk foam production, high-temperature steam from the coffee machine's steam output unit flows into the milk foam generation channel through the steam inlet. External air flows into the milk foam generation channel through the air inlet, and milk from the container flows into the milk foam generation channel through the milk inlet. The milk, steam, and air mix within the milk foam generation channel to form milk foam. To obtain smaller foam, the user can rotate the adjustment component to move the pusher towards the flexible seal, reducing the effective opening of the air inlet and thus decreasing the air intake. To obtain larger foam, the user can rotate the adjustment component in the opposite direction, moving the pusher away from the air inlet. The flexible seal rebounds due to its elasticity, increasing the effective opening of the air inlet and thus increasing the air intake. This allows for adjustment of the effective opening of the air inlet, enabling users to increase or decrease the air intake according to their preferences through simple rotation, ultimately obtaining milk foam of different sizes to meet the needs of different users.

[0007] According to some embodiments of the present invention, the flexible seal is provided with a protrusion, at least a portion of which is accommodated within the air inlet, and the pushing portion is capable of pushing the protrusion to move along the direction of entering the air inlet.

[0008] According to some embodiments of the present invention, the width of the protrusion gradually increases from the bottom cover to the top cover.

[0009] According to some embodiments of the present invention, the adjusting component is provided with an external thread, and the top cover is provided with an internal thread that matches the external thread, so that the adjusting component is threadedly connected to the top cover.

[0010] According to some embodiments of the present invention, the milk foam generating channel includes a first channel and a second channel connected to the first channel. The steam inlet, the milk foam outlet and the milk inlet are all located in the first channel. The second channel is provided with the air inlet, and the air outlet of the second channel is located between the steam inlet and the milk inlet.

[0011] According to some embodiments of the present invention, the first flow channel includes a first flow section, a second flow section, and a third flow section connected in sequence. The effective flow area of ​​the first flow section and the effective flow area of ​​the third flow section are both greater than the effective flow area of ​​the second flow section. The steam inlet is located in the first flow section, and the milk inlet is located in the third flow section.

[0012] According to some embodiments of the present invention, in the direction from the first flow section to the third flow section, the effective flow area of ​​the second flow section first decreases and then increases.

[0013] According to some embodiments of the present invention, a sealing structure is provided between the flexible seal and the bottom cover, and the sealing structure is used to seal the milk foam generation channel.

[0014] According to some embodiments of the present invention, the sealing structure includes a sealing groove provided on the bottom cover and a sealing protrusion provided on the flexible sealing element. The sealing groove extends circumferentially along the milk foam generating channel, and the sealing protrusion is accommodated in the sealing groove and abuts against the side wall of the sealing groove.

[0015] The coffee machine according to a second aspect of the present invention includes the milk frothing adjustment device described in the above embodiments.

[0016] The coffee machine according to the second aspect of the present invention has at least the following beneficial effects: The milk foam regulating device according to the first aspect of this utility model, during milk foam production, high-temperature steam output from the steam output device of the coffee machine flows into the milk foam generating channel through the steam inlet, external air flows into the milk foam generating channel through the air inlet, and milk in the receiving cavity flows into the milk foam generating channel through the milk inlet. After the milk, steam, and air mix in the milk foam generating channel, milk foam is formed. To obtain smaller milk foam, the user can rotate the regulating component to make the pushing part push the flexible seal to move in the direction closer to the air inlet, thereby reducing the effective opening of the air inlet and thus reducing the air intake volume to obtain smaller milk foam. To obtain larger milk foam, the user can rotate the regulating component in the opposite direction to make the pushing part move in the direction away from the air inlet. The flexible seal rebounds under its own elasticity, thereby increasing the effective opening of the air inlet and thus increasing the air intake volume to obtain larger milk foam. The effective opening of the air inlet can be adjusted. Users can increase or decrease the air intake volume by simple rotation operation according to their personal preferences to obtain milk foam of different sizes, which can meet the needs of different users.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a milk box assembly according to an embodiment of the present invention; Figure 2 This is an exploded view of a milk box assembly according to an embodiment of the present invention; Figure 3 This is a top view of a milk box assembly according to an embodiment of the present invention; Figure 4for Figure 3 Sectional view of line AA in the middle; Figure 5 This is a schematic diagram of the bottom cover of one embodiment of the present utility model; Figure 6 This is a top view of the bottom cover according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a sealing element according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the top cover of one embodiment of the present utility model.

[0019] Icon labels: Box body 100, receiving cavity 110, box cover assembly 200, milk foam generating channel 210, first channel 211, first flow section 2111, second flow section 2112, third flow section 2113, second channel 212, steam inlet 220, air inlet 230, milk inlet 240, milk storage tank 250, milk foam outlet 251, bottom cover 260, sealing groove 261, top cover 270, internal thread 271, flexible seal 280, protrusion 281, sealing protrusion 282, adjusting assembly 300, connecting rod 301, screwing part 302, pushing part 310, external thread 320, straw 400. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] In related technologies, the milk tank assembly in a coffee machine outputs high-temperature steam through the machine's steam output device during operation. This steam, combined with air entering the milk tank assembly from the outside, mixes with the milk to form milk foam. However, existing milk tank assemblies cannot control the amount of air intake or adjust the size of the milk foam, thus failing to meet the needs of different users.

[0025] Reference Figures 1 to 4 The milk frothing regulating device according to a first aspect of this utility model includes a housing 100, a lid assembly 200, and an regulating assembly 300. The housing 100 has a receiving cavity 110 for receiving milk. The lid assembly 200 includes a bottom cover 260, a flexible sealing element 280, and a top cover 270. The bottom cover 260 covers the receiving cavity 110 and has a milk frothing channel 210. The milk frothing channel 210 has a steam inlet 220, a milk inlet 240, an air inlet 230, and a milk frothing outlet 251. The milk inlet 240 communicates with the receiving cavity 110. The flexible sealing element 280 covers the milk frothing channel 210. The top cover 270 is connected to the bottom cover 260, and the flexible seal 280 is located between the bottom cover 260 and the top cover 270. The adjustment component 300 has a pushing part 310, which abuts against the side of the flexible seal 280 away from the bottom cover 260. The adjustment component 300 is rotatably disposed on the top cover 270 so that the minimum distance between the flexible seal 280 and the air inlet 230 can be increased or decreased, thereby realizing the adjustment of the effective opening of the air inlet 230. Users can increase or decrease the air intake by simple rotation operation according to their personal preferences, and finally obtain milk foam of different sizes to meet the needs of different users.

[0026] For example, during milk foam production, high-temperature steam output from the coffee machine's steam output device flows into the milk foam generation channel 210 through the steam inlet 220. External air flows into the milk foam generation channel 210 through the air inlet 230. Milk in the receiving cavity 110 flows into the milk foam generation channel 210 through the milk inlet 240. The milk, steam, and air mix in the milk foam generation channel 210 to form milk foam. To obtain smaller milk foam, the user can rotate the adjusting component 300 to push the flexible seal 280 towards the air inlet 230, thereby effectively opening the air inlet 230. The air intake is reduced to obtain smaller milk foam. To obtain larger milk foam, the user can rotate the adjusting component 300 in the opposite direction so that the pushing part 310 moves away from the air inlet 230. The flexible seal 280 rebounds under its own elasticity, which increases the effective opening of the air inlet 230, thereby increasing the air intake and obtaining larger milk foam. The effective opening of the air inlet 230 can be adjusted. Users can increase or decrease the air intake by simple rotation according to their personal preferences, and finally obtain milk foam of different sizes to meet the needs of different users.

[0027] It should be noted that the greater the air intake, the larger and fluffier the milk foam; conversely, the smaller the air intake, the smaller and denser the milk foam. This will not be elaborated further here.

[0028] It should be noted that the milk foam generating channel 210 also has a milk storage tank 250, which is located between the milk inlet 240 and the milk foam outlet 251. After the milk, air and steam are mixed to form milk foam, the milk foam flows out from the milk foam outlet 251 through the milk storage tank 250, so that the milk foam can be temporarily stored in the milk storage tank 250. When the user needs to use the milk foam again, it can be directly obtained from the milk foam outlet 251, which can improve the convenience of use and user experience. No restrictions are imposed here.

[0029] It should be noted that the lid assembly 200 also includes a straw 400. One end of the straw 400 is connected to the milk inlet 240, and the other end of the straw 400 extends into the receiving cavity 110. Due to the high flow rate of the high-temperature steam, when the high-temperature and high-speed steam passes through the milk inlet 240, the air pressure at the milk inlet 240 is lower than the air pressure in the receiving cavity 110 under the siphon effect. That is, a negative pressure zone is formed at the milk inlet 240. The milk in the receiving cavity 110 can flow from the milk inlet 240 into the milk foam generating channel 210 through the straw 400, which is beneficial for mixing milk, steam and external air, and can facilitate the generation of milk foam.

[0030] Reference Figure 4 , Figure 5 and combined Figure 7In this embodiment, the flexible seal 280 is provided with a protrusion 281, at least a portion of which is accommodated within the air inlet 230. The pushing part 310 can push the protrusion 281 to move along the direction of entering the air inlet 230. By directly pushing the protrusion 281, the effective opening of the air inlet 230 can be adjusted, making the adjustment of the air intake more direct and precise. At the same time, the protrusion 281 helps to achieve a better sealing effect at the minimum opening, preventing milk leakage or steam escape.

[0031] For example, when the pressing part 310 presses against the flexible seal 280, the protrusion 281 moves in the direction of entering the air inlet 230, thereby reducing the effective opening of the air inlet 230 and decreasing the amount of air intake. When the pressing part 310 moves away from the bottom cover 260, the protrusion 281 moves in the direction of exiting the air inlet 230, thereby increasing the effective opening of the air inlet 230 and increasing the amount of air intake, making the adjustment of the air intake more direct and precise. At the same time, the protrusion 281 helps to achieve a better sealing effect at the minimum opening, preventing milk leakage or vapor escape.

[0032] It should be noted that the protrusion 281 can also increase the structural strength of the flexible seal 280, which can prevent the flexible seal 280 from being squeezed and torn by the pushing part 310, thereby improving the service life of the flexible seal 280.

[0033] In this embodiment, the width of the protrusion 281 gradually increases from the bottom cover 260 to the top cover 270. The protrusion 281 has a conical structure. During the movement, the protrusion 281 contacts the wall of the air inlet 230 more smoothly, playing a self-guiding role, preventing the flexible seal 280 from tilting, and ensuring smooth and stable adjustment.

[0034] Reference Figure 4 , Figure 8 In this embodiment, the adjustment component 300 is provided with an external thread 320, and the top cover 270 is provided with an internal thread 271 that matches the external thread 320, so that the adjustment component 300 and the top cover 270 are threadedly connected. By using the threaded pair to convert the rotational motion into linear displacement, the position of the pushing part 310 can be accurately and stably controlled.

[0035] For example, the adjustment assembly 300 includes a connecting rod 301 and a screwing member 302 connected to one end of the connecting rod 301. An external thread 320 is provided on the connecting rod 301, and a pushing part 310 is provided at the end of the connecting rod 301 away from the screwing member 302. The screwing member 302 is located above the top cover 270. The user can rotate the connecting rod 301 by rotating the screwing member 302 so that the pushing part 310 can push the flexible seal 280. By using the threaded pair to convert the rotational motion into linear displacement, precise and stable control of the position of the pushing part 310 can be achieved.

[0036] It should be noted that the self-locking characteristic of the threaded pair ensures that the adjusting component 300 will not change unexpectedly during operation, thus ensuring the stability of the milk foam quality, which will not be elaborated further here.

[0037] In another embodiment, the adjusting component 300 is a cam, and the pushing part 310 is the eccentric part of the cam, which can also push the flexible seal 280, and is not limited here.

[0038] Reference Figure 5 , Figure 6 In this embodiment, the milk foam generating channel 210 includes a first channel 211 and a second channel 212 connected to the first channel 211. The steam inlet 220 and the milk inlet 240 are both located in the first channel 211, which is connected to the milk storage tank 250. The second channel 212 is provided with an air inlet 230, and the air outlet of the second channel 212 is located between the steam inlet 220 and the milk inlet 240. High-speed steam enters the first channel 211 from the steam inlet 220. When it flows through the air outlet of the second channel 212, it will draw air from the air inlet 230 using the Venturi effect. The steam and air mix first to form a gas-liquid two-phase flow. Then, this mixed airflow impacts the milk drawn in from the milk inlet 240, which can better cut and disperse the air in the milk, thereby generating finer and denser milk foam.

[0039] For example, by setting up an independent second flow channel 212 and arranging the air outlet of the second flow channel 212 between the steam inlet 220 and the milk inlet 240, the high-temperature steam mixes with the air first and then acts on the milk. The steam kinetic energy can be used to entice the air, which improves the air mixing efficiency and makes the mixing of milk, steam and air more thorough and uniform, thereby helping to generate milk foam with a finer and denser texture.

[0040] Reference Figure 5 , Figure 6 In this embodiment, the first flow channel 211 includes a first flow section 2111, a second flow section 2112, and a third flow section 2113 connected in sequence. The effective flow area of ​​the first flow section 2111 and the effective flow area of ​​the third flow section 2113 are both larger than the effective flow area of ​​the second flow section 2112. The steam inlet 220 is located in the first flow section 2111, and the milk inlet 240 is located in the third flow section 2113. According to fluid mechanics, when the fluid passes through a narrow channel, the flow velocity increases and the pressure decreases. When the steam enters the second flow section 2112 with a small cross-section from the first flow section 2111 with a large cross-section, the flow velocity increases sharply and the pressure drops sharply. This low-pressure zone can more effectively draw milk from the milk inlet 240. After that, the fluid enters the third flow section 2113 with a large cross-section, and the flow velocity decreases, which is conducive to more complete energy exchange and mixing and emulsification of steam, air, and milk.

[0041] For example, by designing the first flow channel 211 as a three-section structure, the narrow channel formed by the second flow section 2112 can accelerate the steam flow rate and generate negative pressure, which can enhance the suction capacity of milk. Subsequently, in the third flow section 2113 where the effective flow area is expanded, the fluid velocity is reduced, providing more space and time for milk, steam and air to mix. This not only improves the efficiency of milk foam generation, but also further optimizes the density and quality of milk foam.

[0042] Reference Figure 5 , Figure 6 In this embodiment, from the first flow section 2111 to the third flow section 2113, the effective flow area of ​​the second flow section 2112 first decreases and then increases, which can optimize the fluid dynamic characteristics in the first flow channel 211, reduce the resistance, eddies and energy loss in the steam flow process, and make the acceleration and deceleration process of the steam flow more stable and efficient, thereby improving the suction force and mixing effect while reducing working noise and energy consumption.

[0043] For example, the second flow section 2112 includes a smooth converging section and a smooth expanding section, which can reduce the flow resistance of the fluid, avoid the generation of eddies and energy loss, and make the fluid accelerate more smoothly and efficiently. The smooth expanding section can reduce the energy loss of the fluid during diffusion, make the pressure recovery more gradual, and make the mixing process more stable. It can reduce flow loss, thereby improving energy utilization efficiency and the stability of the mixing process.

[0044] Reference Figure 6 , Figure 7 In this embodiment, a sealing structure is provided between the flexible seal 280 and the bottom cover 260. The sealing structure is used to seal the milk foam generation channel 210, which can prevent high-pressure steam and milk from leaking from the milk foam generation channel 210. On the one hand, it can ensure the working pressure and suction force required for the milk foam generation process, and on the other hand, it can maintain the cleanliness and hygiene of the inside of the coffee machine.

[0045] In this embodiment, the sealing structure includes a sealing groove 261 provided on the bottom cover 260 and a sealing protrusion 282 provided on the flexible seal 280. The sealing groove 261 extends circumferentially along the milk foam generation channel 210, and the sealing protrusion 282 is accommodated in the sealing groove 261 and abuts against the side wall of the sealing groove 261. This can prevent high-pressure steam and milk from leaking from the milk foam generation channel 210. On the one hand, it can ensure the working pressure and suction force required for the milk foam generation process, and on the other hand, it can maintain the cleanliness and hygiene of the inside of the coffee machine.

[0046] For example, by adopting a sealing structure in which the sealing groove 261 and the sealing protrusion 282 interlock, the sealing contact area between the bottom cover 260 and the sealing element can be increased to provide better radial sealing force. This can withstand the high steam pressure inside the milk foam generation channel 210 and prevent high-pressure steam and milk from leaking from the milk foam generation channel 210. On the one hand, this ensures the working pressure and suction force required for the milk foam generation process, and on the other hand, it maintains the cleanliness and hygiene inside the coffee machine.

[0047] It should be noted that the positions of the sealing groove 261 and the sealing protrusion 282 can be interchanged, that is, the sealing groove 261 is located on the sealing element and the sealing protrusion 282 is located on the bottom cover 260, without any restrictions.

[0048] As another implementation, the sealing structure is a sealing ring, which is sleeved on the outer periphery of the milk foam generating channel 210 and sandwiched between the bottom cover 260 and the sealing element. It can also seal the milk foam generating channel 210, which will not be described in detail here.

[0049] For example, the coffee machine of the second aspect of this utility model includes the milk frothing regulating device of the first aspect of this utility model. Since the coffee machine adopts all the technical solutions of the milk frothing adjustment device of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0050] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A milk frothing regulating device, characterized in that, include: The box body (100) is provided with a receiving cavity (110) for holding milk. The lid assembly (200) includes a bottom cover (260), a flexible seal (280), and a top cover (270). The bottom cover (260) covers the receiving cavity (110). The bottom cover (260) is provided with a milk foam generating channel (210). The milk foam generating channel (210) has a steam inlet (220), a milk inlet (240), an air inlet (230), and a milk foam outlet (251). The milk inlet (240) communicates with the receiving cavity (110). The flexible seal (280) covers the milk foam generating channel (210). The top cover (270) is connected to the bottom cover (260), and the flexible seal (280) is located between the bottom cover (260) and the top cover (270). The adjustment assembly (300) has a pushing part (310) that abuts against the side of the flexible seal (280) away from the bottom cover (260). The adjustment assembly (300) is rotatably disposed on the top cover (270) to increase or decrease the minimum distance between the flexible seal (280) and the air inlet (230).

2. The milk frothing regulating device according to claim 1, characterized in that: The flexible seal (280) is provided with a protrusion (281), at least a portion of which is accommodated in the air inlet (230), and the pushing part (310) is capable of pushing the protrusion (281) to move in the direction of entering the air inlet (230).

3. The milk frothing regulating device according to claim 2, characterized in that: The width of the protrusion (281) gradually increases from the bottom cover (260) to the top cover (270).

4. The milk frothing regulating device according to claim 1, characterized in that: The adjusting component (300) is provided with an external thread (320), and the top cover (270) is provided with an internal thread (271) that matches the external thread (320), so that the adjusting component (300) is threadedly connected to the top cover (270).

5. The milk frothing regulating device according to claim 1, characterized in that: The milk foam generating channel (210) includes a first channel (211) and a second channel (212) connected to the first channel (211). The steam inlet (220), the milk foam outlet (251) and the milk inlet (240) are all located in the first channel (211). The second channel (212) is provided with the air inlet (230). The air outlet of the second channel (212) is located between the steam inlet (220) and the milk inlet (240).

6. The milk frothing regulating device according to claim 5, characterized in that: The first flow channel (211) includes a first flow section (2111), a second flow section (2112), and a third flow section (2113) connected in sequence. The effective flow area of ​​the first flow section (2111) and the effective flow area of ​​the third flow section (2113) are both greater than the effective flow area of ​​the second flow section (2112). The steam inlet (220) is located in the first flow section (2111), and the milk inlet (240) is located in the third flow section (2113).

7. The milk frothing regulating device according to claim 6, characterized in that: In the direction from the first flow segment (2111) to the third flow segment (2113), the effective flow area of ​​the second flow segment (2112) first decreases and then increases.

8. The milk frothing regulating device according to claim 1, characterized in that: A sealing structure is provided between the flexible seal (280) and the bottom cover (260), and the sealing structure is used to seal the milk foam generation channel (210).

9. The milk frothing regulating device according to claim 8, characterized in that: The sealing structure includes a sealing groove (261) provided on the bottom cover (260) and a sealing protrusion (282) provided on the flexible seal (280). The sealing groove (261) extends circumferentially along the milk foam generating channel (210), and the sealing protrusion (282) is accommodated in the sealing groove (261) and abuts against the side wall of the sealing groove (261).

10. A coffee machine, characterized in that, include: The milk frothing device according to any one of claims 1 to 9.

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