Emulsifying device and beverage dispenser

Abstract

The emulsifying device comprises a hollow body, the hollow body is provided with a mixing cavity, the mixing cavity is communicated with a steam channel, a liquid inlet channel, an air inlet channel and an outlet channel, the steam channel is used for being communicated with a steam source, the liquid inlet channel is used for being communicated with a liquid storage source, and the air inlet channel is used for being communicated with air; the outlet channel is used for outputting mixed fluid generated by the mixing cavity based on the Venturi effect; the switching structure is used for connecting the liquid inlet channel and the air inlet channel, the operation part is used for driving the switching structure, and the switching structure is inserted into the liquid inlet channel and the air inlet channel to form a liquid flow variable part and an air flow variable part respectively; the operation part is used for driving the switching structure to move so that the liquid inlet amount of the liquid inlet channel can be changed through the liquid flow variable part, and the air inlet amount of the air inlet channel can be changed through the air flow variable part.

Description

Technical Field

[0001] The present invention relates to the technical field of beverage preparation, and particularly relates to an emulsifying device and a beverage machine. Background Art

[0002] Modern beverage machines are often provided with an emulsifying device for preparing milk foam or hot milk. The emulsifying device is usually connected to a steam delivery joint provided on the beverage machine. The emulsifying device includes a foaming body, on which a steam joint, a milk outlet pipe and a milk inlet pipe are provided. A mixing chamber is provided inside the foaming body, and an air inlet is provided at the upper end of the foaming body. During use, steam enters the mixing chamber from the steam joint, forms a negative pressure in the mixing chamber, drives milk to flow into the mixing chamber from the milk inlet pipe, and a small amount of air is sucked into the mixing chamber through the air inlet, and is mixed with the milk in the mixing chamber to form milk foam. The milk foam finally flows out from the milk outlet pipe, so as to be used for making milk coffee.

[0003] For the existing emulsifying device, the size of the milk foam is mainly adjusted by controlling the amount of air intake to output milk foam with different fineness degrees, but the milk foam with a large temperature difference range cannot be output by controlling the amount of air intake. Obviously, this cannot meet the user's need to obtain milk foam at different temperatures. Summary of the Invention

[0004] The purpose of the present invention is to provide an emulsifying device that is convenient to operate and can meet the user's needs.

[0005] The purpose of the present invention is to provide a beverage machine that is convenient to operate and can meet the user's needs.

[0006] To achieve the above-mentioned invention purposes, the present invention provides an emulsifying device, including a hollow body, the hollow body has a mixing chamber, the mixing chamber communicates with a steam channel, a liquid inlet channel, an air inlet channel and an outlet channel. The steam channel is used to communicate with a steam source, the liquid inlet channel is used to communicate with a liquid storage source, the air inlet channel is used to communicate with air, and the outlet channel is used to output the mixed fluid generated by the mixing chamber based on the Venturi effect;

[0007] It further includes a switching structure connecting the liquid inlet channel and the air inlet channel and an operating part for driving the switching structure. The switching structure is inserted into the liquid inlet channel and the air inlet channel to respectively form a variable liquid flow part and a variable air flow part. The operating part is used to drive the switching structure to move to change the liquid inlet amount of the liquid inlet channel through the variable liquid flow part, and change the air intake amount of the air inlet channel through the variable air flow part.

[0008] As a further improvement of an embodiment of the present invention, the airflow variable part and the liquid flow variable part are arranged at intervals, and are spaced by an air groove therebetween. The air groove communicates with the liquid inlet channel, and air enters the mixing chamber together with the liquid in the liquid inlet channel after passing through the airflow variable part and the air groove in sequence.

[0009] As a further improvement of an embodiment of the present invention, the switching structure includes a plurality of connection channels arranged between the liquid inlet channel and the mixing chamber. The cross-sectional areas of the plurality of connection channels are different, and the plurality of connection channels are configured as the liquid flow variable part. By switching one of the plurality of connection channels to communicate with the mixing chamber, the liquid inlet volume of the liquid inlet channel is changed.

[0010] As a further improvement of an embodiment of the present invention, each connection channel has an upstream opening and a downstream opening, and at least one of the upstream opening and the downstream opening communicates with the air groove. Air enters the mixing chamber together with the liquid in the connection channel from the air groove.

[0011] As a further improvement of an embodiment of the present invention, the switching structure includes a single conversion member connecting the liquid inlet channel. The single conversion member extends into the air inlet channel along the extending direction of the air inlet channel. When the single conversion member moves relative to the hollow body, the air inlet volume of the air inlet channel and the liquid inlet volume of the liquid inlet channel are changed, and the liquid inlet volume of the liquid inlet channel has a preset corresponding relationship with the air inlet volume of the air inlet channel.

[0012] As a further improvement of an embodiment of the present invention, the single conversion member is provided with a plurality of connection channels. The cross-sectional areas of the plurality of connection channels are different, and the plurality of connection channels are configured as the liquid flow variable part. The single conversion member drives one of the plurality of connection channels to communicate with the liquid inlet channel to change the liquid inlet volume of the liquid inlet channel.

[0013] As a further improvement of an embodiment of the present invention, the single conversion member is configured as a cylindrical shape. The single conversion member extends from the air inlet channel into the liquid inlet channel. The plurality of connection channels are arranged at intervals along the circumferential direction and penetrate through the single conversion member in the radial direction. The single conversion member rotates relative to the hollow body to select the connection channel communicating with the liquid inlet channel.

[0014] As a further improvement of one embodiment of the present invention, the emulsification device also includes a sealing member that at least partially extends into the air inlet channel, and the sealing member is sleeved on the periphery of the single conversion member, and a longitudinally extending variable-section air inlet groove is provided on one of the inner wall of the sealing member and the outer wall of the single conversion member, and a sealing rib is provided on the other of the inner wall of the sealing member and the outer wall of the single conversion member, and the matching portion of the sealing rib and the variable-section air inlet groove constitutes the variable airflow portion.

[0015] As a further improvement of one embodiment of the present invention, a connecting groove is arranged between the variable-section air inlet groove and the multiple connecting channels, and the connecting groove includes an annular groove and a plurality of air grooves connected to the multiple connecting channels one by one, and the annular groove extends along the circumference of the single conversion component and axially connects the variable-section air inlet groove and the multiple air grooves respectively.

[0016] As a further improvement of one embodiment of the present invention, the variable-section air inlet groove is constructed as a stepped groove, the number of steps of the stepped groove is the same as the number of the multiple connecting channels and corresponds one to one, and the sealing rib is constructed as a stepped sealing rib corresponding to the stepped groove.

[0017] As a further improvement of one embodiment of the present invention, the switching structure includes a first conversion component connected to the liquid inlet channel and a second conversion component connected to the air inlet channel, and the operating part drives the first conversion component and the second conversion component to move synchronously to change the size of the air intake volume of the air inlet channel and the size of the liquid intake volume of the liquid inlet channel. The size of the liquid intake volume of the liquid inlet channel and the size of the air intake volume of the air inlet channel are in a preset corresponding relationship.

[0018] As a further improvement of an embodiment of the present invention, the operating part is transmission-connected with the first conversion member or the second conversion member, and the first conversion member is transmission-connected with the second conversion member; or the operating part is transmission-connected with the first conversion member and the second conversion member respectively.

[0019] As a further improvement of an embodiment of the present invention, the first conversion member is transmission-connected with the second conversion member, the second conversion member is configured as an active member, and the first conversion member is configured as a driven member.

[0020] As a further improvement of an embodiment of the present invention, the second conversion member extends into the intake passage along an extension direction of the intake passage, and the second conversion member rotates around a center line of the intake passage to drive the first conversion member to move linearly.

[0021] As a further improvement of an embodiment of the present invention, the second conversion member extends into the intake passage along a direction perpendicular to the extension of the intake passage, and the second conversion member rotates relative to the hollow body to drive the first conversion member to move linearly.

[0022] As a further improvement of an embodiment of the present invention, the liquid inlet passage and the intake passage communicate with different positions of the mixing chamber. The liquid inlet passage is provided with a first opening, the first conversion member extends into the liquid inlet passage from the first opening, the intake passage has a second opening, the second conversion member extends into the liquid inlet passage from the second opening, and the first opening and the second opening face the same direction.

[0023] As a further improvement of an embodiment of the present invention, a through port cooperating with the first conversion member is provided in the liquid inlet passage, and the cooperating portion of the first conversion member and the through port is configured as the variable liquid flow portion. The first conversion member changes the liquid inflow volume of the liquid inlet passage by adjusting the fluid passage area of the through port.

[0024] As a further improvement of an embodiment of the present invention, the first conversion member includes a plurality of air flow channels connected to the intake passage, the plurality of air flow channels are configured as the variable air flow portion, the cross-sectional areas of the plurality of air flow channels are different, and the intake volume of the intake passage is changed by switching different air flow channels to communicate with the mixing chamber.

[0025] As a further improvement of an embodiment of the present invention, it further includes a tank body and a cover assembly covering the upper part of the tank body. The tank body has a liquid storage chamber for storing liquid, and the hollow body is arranged on the cover assembly; an installation opening is provided outside the cover assembly, the switching mechanism passes through the installation opening and is connected to the operation portion, the operation portion is configured as a knob, and the knob drives the switching mechanism to move so as to simultaneously change the liquid inflow volume of the liquid inlet passage and the intake volume of the intake passage.

[0026] The present invention also relates to a beverage machine, which includes an emulsifying device as described in any one of the above embodiments. The beverage machine includes a front panel provided with a beverage outlet, and the steam passage of the emulsifying device communicates with the beverage machine.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: By driving the switching structure to move through an operation portion, the liquid inflow volume of the liquid inlet passage and the intake volume of the intake passage can be adjusted simultaneously, which is more convenient for users. Through one-key operation of the operation portion, the air supply volume and the liquid supply volume change simultaneously, and milk foam with different temperatures and ensured quality can be generated. Description of the Drawings

[0028] Figure 1 Schematic perspective view of an emulsifying device according to an embodiment of the present invention.

[0029] Figure 2 It is Figure 1 Exploded schematic view of the emulsifying device in

[0030] Figure 3 It is Figure 1 Schematic perspective view of some components of the emulsifying device in

[0031] Figure 4 It is Figure 1 Front view of the emulsifying device in

[0032] Figure 5 It is Figure 4 Cross-sectional schematic view of the emulsifying device along line A-A in

[0033] Figure 6 It is Figure 4 Cross-sectional schematic view of the emulsifying device along line B-B in

[0034] Figure 7 Schematic view of an emulsifying device according to the second embodiment of the present invention.

[0035] Figure 8 It is Figure 7 Schematic view of the air intake part of the emulsifying device in

[0036] Figure 9 Schematic perspective view of an emulsifying device according to the third embodiment of the present invention.

[0037] Figure 10 It is Figure 9 Exploded schematic view of the emulsifying device in

[0038] Figure 11 It is Figure 10 Schematic perspective assembly view of some components of the emulsifying device in

[0039] Figure 12 It is Figure 11 Exploded schematic view between the second conversion part and the seal of the emulsifying device in

[0040] Figure 13 It is Figure 9 Cross-sectional schematic view of the emulsifying device along line C-C in

[0041] Figure 14 It is Figure 9 Cross-sectional schematic view of the emulsifying device along line D-D in

[0042] Figure 15 Schematic perspective view of an emulsifying device according to the third embodiment of the present invention.

[0043] Figure 16 is Figure 15 a schematic exploded view of the emulsifying device in

[0044] Figure 17 is Figure 15 a schematic perspective assembly view of some components of the emulsifying device in

[0045] Figure 18 is Figure 15 a schematic sectional view of the emulsifying device in along line E - E

[0046] Figure 19 is Figure 18 an enlarged schematic view of part a of the emulsifying device in

[0047] Figure 20 is Figure 19 a schematic view of the second conversion part of the emulsifying device in cooperating with the base to form an air gap

[0048] Figure 21 is Figure 15 a schematic sectional view of the emulsifying device in along line F - F Detailed Embodiments

[0049] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included within the protection scope of the present invention.

[0050] It should be understood that the spatially relative terms such as "upper", "above", "lower", "below", etc. used herein are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The spatially relative terms may be intended to include different orientations of the device in use or operation other than the orientation shown in the figures.

[0051] The emulsifying device in the specific embodiments of the present invention will be described by taking the emulsifying device used in conjunction with a beverage machine as an example. Refer to Figures 1 to 6As shown, in this embodiment, the emulsifying device 100 includes a hollow body 20. The hollow body 20 has a mixing chamber 21. The mixing chamber 21 communicates with a steam channel 22, a liquid inlet channel 23, an air inlet channel 24, and an outlet channel 25. The steam channel 22 is used to communicate with a steam source, the liquid inlet channel 23 is used to communicate with a liquid storage source, the air inlet channel 24 is used to communicate with air, and the outlet channel 25 is used to output the mixed fluid generated in the mixing chamber 21 based on the Venturi effect. Among them, the steam channel 22 is defined as the channel between the steam joint communicating with the steam source and the mixing chamber 21, the liquid inlet channel 23 is defined as the channel from the liquid storage source to the mixing chamber 21, the air inlet channel 24 is defined as the channel from the external air to the mixing chamber 21, and the outlet channel 25 is defined as the channel flowing from the mixing chamber 21 to the user's beverage cup. The hollow body 20 forms a Venturi tube. When the steam is ejected, a negative pressure is generated in the mixing chamber 21 under the Venturi effect. Under the action of the negative pressure, the liquid storage source (such as milk) will be sucked into the mixing chamber 21 to be mixed with the steam, so as to obtain milk with a certain temperature rise; or the liquid storage source (such as milk) and air will be sucked into the mixing chamber 21 to be mixed with the steam and air together. In this process, the steam, milk, and air are fully and evenly mixed, so that delicate milk foam can be formed and discharged from the outlet channel.

[0052] The hollow body 20 is connected to a steam nozzle 28. The steam nozzle 28 is hermetically connected to the hollow body 20 through a sealing ring. The steam nozzle 28 is adapted to the contraction part 213 of the Venturi tube through a conical nozzle head, so that a vacuum will be formed in the mixing chamber 21 of the Venturi tube after the steam flows through the steam nozzle 28. The vacuum can effectively suck air and milk into the mixing chamber 21. The mixing chamber 21 includes a first mixing chamber 211. The contraction part 213 is arranged at the end of the first mixing chamber 211. When the steam is ejected, a local vacuum is generated in the first mixing chamber 211. Under the action of the negative pressure, the milk of the liquid storage source will be sucked in to be mixed with the steam and air together.

[0053] Preferably, the mixing chamber 21 may include a first mixing chamber 211 and a second mixing chamber 212 arranged in sequence along the direction of fluid input to output. The milk foam after foaming in the first mixing chamber 211 enters the second mixing chamber 212 under the action of inertia and subsequent steam propulsion. In the second mixing chamber 212, the steam, milk, and air are further mixed to obtain a fully and evenly compact milk foam, and the foaming degree also increases accordingly. The formed milk foam will be discharged from the outlet channel 25. The outlet channel 25 is connected to an outlet pipe 26 and is output to the user's beverage cup through the outlet pipe 26.

[0054] The emulsifying device 100 further includes a switching structure connecting the liquid inlet channel 23 and the air inlet channel 24, and an operating part 50 for driving the switching structure. The switching structure is inserted into the liquid inlet channel 23 and the air inlet channel 24 to form a variable liquid flow part and a variable air flow part respectively. The operating part 50 is used to drive the switching structure to move so as to change the liquid inlet volume of the liquid inlet channel 23 through the variable liquid flow part, and change the air inlet volume of the air inlet channel 24 through the variable air flow part.

[0055] By driving the switching structure to move with an operating part 50, the liquid inlet volume of the liquid inlet channel 23 and the air inlet volume of the air inlet channel 24 can be adjusted simultaneously, which is more convenient for users. Through a one-key operation of the operating part 50, the air supply volume and the liquid supply volume change simultaneously, and milk foam with different temperatures and ensured quality can be generated, such as cold milk foam with a temperature in the range of 10°C to 30°C and hot milk foam with a temperature in the range of 40°C to 70°C. The emulsifying device can output cold and hot milk foam to meet the needs of different users for more flavors.

[0056] Among them, the variable liquid flow part is defined as the structural part where the liquid inlet volume can be changed, and the variable air flow part is defined as the structural part where the air inlet volume can be changed. In this embodiment, the variable air flow part and the variable liquid flow part are arranged at intervals. Air enters the mixing chamber 21 together with the liquid in the liquid inlet channel 23. The variable air flow part and the variable liquid flow part are arranged at intervals through an air groove 513. The air groove 513 communicates with the liquid inlet channel 23. Air enters the mixing chamber 21 together with the liquid in the liquid inlet channel 23 after passing through the variable air flow part and the air groove in sequence, that is, the variable air flow part is arranged upstream of the air groove 513, and the variable air flow part is indirectly connected to the variable liquid flow part. The variable air flow part and the variable liquid flow part are arranged at intervals, so that the air inlet volume and the liquid inlet volume can be set more flexibly, and the control of the sizes of the air inlet volume and the liquid inlet volume is more accurate. In addition, air and liquid can enter the mixing chamber 21 through the same inlet, and air and liquid can be premixed before entering the mixing chamber 21 to further improve the foaming effect in the mixing chamber 21.

[0057] In this embodiment, the switching structure includes a first connection channel 231 and a second connection channel 232 arranged between the liquid inlet channel 23 and the mixing chamber 21. The channel cross-sectional areas of the first connection channel 231 and the second connection channel 232 are different. The first connection channel 231 and the second connection channel 232 are configured as variable liquid flow parts. By switching one of the first connection channel 231 and the second connection channel 232 to communicate with the mixing chamber 21, the liquid inlet volume of the liquid inlet channel 23 is changed. By setting two connection channels with different fixed cross-sectional areas, the liquid inlet volume can be controlled more accurately to adapt to the liquid inlet volumes required for two different milk foam quality / temperature requirements. Of course, more connection channels can also be set to provide more choices for users. Two or more connection channels constitute a stepped adjustment of the liquid inlet volume, making it more convenient for users to operate.

[0058] Specifically, the first connection channel 231 and the second connection channel 232 respectively have an upstream opening 234 and a downstream opening 235. At least one of the upstream opening 234 and the downstream opening 235 communicates with the air groove 513. Air enters the mixing chamber 21 from the air groove 513 together with the liquid in the first connection channel 23 or the second connection channel 232. Preferably, air grooves 513 are provided at both the upstream opening 234 and the downstream opening 235. The two air grooves 513 can achieve air intake simultaneously from the upstream opening 234 and the downstream opening 235, ensuring more reliable air intake.

[0059] In this embodiment, the switching structure includes a single conversion member 51 connected to the liquid inlet channel 23. The single conversion member 51 extends into the air inlet channel 24 along the extension direction of the air inlet channel 24. When the single conversion member 51 moves relative to the hollow body 20, it changes the air intake amount of the air inlet channel 24 and the liquid intake amount of the liquid inlet channel 23. The liquid intake amount of the liquid inlet channel 23 and the air intake amount of the air inlet channel 24 have a preset corresponding relationship. The single conversion member 51 adjusts the air intake amount and the liquid intake amount simultaneously, with a simpler structure. The connection between the single conversion member 51 and the hollow body 20 is more compact. The preset corresponding relationship means that as the operation part 50 adjusts and moves in one direction, the changes in the air supply amount and the liquid supply amount cause the temperature of the output milk foam to increase; when the operation part 50 adjusts and moves in the opposite direction, the changes in the air supply amount and the liquid supply amount cause the temperature of the output milk foam to decrease. Specifically, when the milk supply cross-sectional area is less than or equal to the first preset value, as the air supply cross-sectional area increases, the temperature of the output milk foam increases; when the milk supply cross-sectional area is greater than or equal to the second preset value, as the air supply cross-sectional area increases, the temperature of the output milk foam decreases, where the second preset value is more than twice the first preset value, preferably three times. By setting the correspondence between the liquid supply amount and the air supply amount, milk foam outputs with different hot and cold temperatures can be obtained, and the quality of the output milk foam is stable.

[0060] Among them, the first connection channel 231 and the second connection channel 232 are provided on the single conversion member 51. Of course, the single conversion member 51 can also be provided with more connection channels with different cross-sectional areas. These multiple connection channels are configured as variable liquid flow parts. The single conversion member 51 drives one of the connection channels to communicate with the liquid inlet channel 23 to change the liquid intake amount of the liquid inlet channel 23. The connection channels are directly provided on the single conversion member 51, which is convenient for the connection between the single conversion member 51 and the hollow body 20, simple for installation and disassembly, and convenient for cleaning.

[0061] The single conversion member 51 is configured as a cylinder. The single conversion member 51 extends from the air inlet passage 24 into the liquid inlet passage 23. The first connection passage 231 and the second connection passage 232 are arranged at intervals along the circumferential direction and penetrate the single conversion member 51 in the radial direction. The single conversion member 51 rotates relative to the hollow body 20 to select the connection passage communicating with the liquid inlet passage 23. The single conversion member 51 switches different connection passages by rotating, ensuring the seal between the single conversion member 51 and the liquid inlet passage 23, and making the liquid inlet adjustment more convenient.

[0062] Further, the emulsifying device 100 further includes a seal member 244 at least partially extending into the air inlet passage 24. The seal member 244 is sleeved around the single conversion member 51. A longitudinally extending variable cross-section air inlet groove 511 is provided on one of the inner wall of the seal member 244 and the outer wall of the single conversion member 51, and a sealing rib 245 is provided on the other of the inner wall of the seal member 244 and the outer wall of the single conversion member 51. The matching part of the sealing rib 245 and the variable cross-section air inlet groove 511 constitutes an air flow variable part. The cooperation between the variable cross-section air inlet groove 511 and the sealing rib 245 realizes stepless adjustment of the air intake volume. In other implementable ways, it can also be that the liquid intake volume is steplessly adjusted while the air intake volume is stepwise adjusted. Among them, the setting of the sealing rib 245 enables the cross-sectional area of the variable cross-section air inlet groove 511 to change in the same way when the single conversion member 51 rotates in two opposite directions from a preset position, and can be switched to another gear along two directions, facilitating the user to select a gear.

[0063] A communication groove is provided between the variable cross-section air inlet groove 511 and the two connection passages. The communication groove includes an annular groove 512 and air grooves 513 corresponding to and communicating with the two connection passages respectively. The number of air grooves 513 can be two, three or four. The annular groove 512 extends along the circumferential direction of the single conversion member 51 and axially communicates with the variable cross-section air inlet groove 511 and the plurality of air grooves 513 respectively. When there are multiple connection passages, the annular groove 512 communicates with the multiple connection passages through the corresponding air grooves 513. Only one variable cross-section air inlet groove 511 needs to be provided, and at different milk foam temperature gears, the mixing chamber 21 can be supplied with air through the corresponding connection passages, simplifying the air intake structure and having good air intake volume consistency.

[0064] In this embodiment, the emulsifying device 100 is configured as a milk tank. The milk tank includes a tank body 11 and a cover assembly 12 covering the upper part of the tank body 11. The tank body 11 has a liquid storage cavity for containing liquid, and the hollow body 20 is arranged on the cover assembly 12. An installation opening 123 is provided on the outer part of the cover assembly 12. The switching mechanism passes through the installation opening 123 and is connected to the operation part 50. The operation part 50 is configured as a knob, and the knob drives the switching mechanism to move so as to simultaneously change the liquid inlet volume of the liquid inlet channel 23 and the air inlet volume of the air inlet channel 24. To facilitate the manufacture of the hollow body 20, the air inlet channel 24 is arranged along the vertical direction, and the vertical direction is defined as the direction perpendicular to the horizontal direction of the tabletop when the milk tank is placed on the tabletop. A part of the liquid inlet channel 23 is horizontally arranged, and the pipe walls of this part of the liquid inlet channel 23 and the air inlet channel 24 are integrally formed with the hollow body 20. Another part of the liquid inlet channel 23 is formed in the L-shaped milk supply pipe 113, and the milk supply pipe 113 is detachably connected to the hollow body 20, which is convenient for cleaning. A single conversion part 51 can extend into the horizontal liquid inlet channel 23 along the vertical direction, and the liquid inlet volume and the air inlet volume can be simultaneously changed by rotation.

[0065] Referring to Figure 7 and Figure 8 As shown, the emulsifying device 200 of the second preferred embodiment of the present invention is different from the first embodiment in that the variable cross-section air inlet groove 511a is configured as a stepped groove, and the number of steps of the stepped groove is the same as and corresponds to the number of connection channels one by one. The sealing rib 245a is also configured as a stepped shape, and is a stepped sealing rib corresponding to the stepped groove along the circumferential direction of the inner wall of the seal 244. The liquid inlet volume and the air inlet volume are both set for stepped adjustment, and the air inlet and liquid inlet control are more accurate, and the consistency of the beverage is good.

[0066] Referring to Figures 9 to 14 As shown, the emulsifying device 300 of the third preferred embodiment of the present invention has components with the same reference numerals as those in the first embodiment, and their structures and functions are similar, so they will not be described in detail here.

[0067] The emulsifying device 300 includes a switching structure, which includes a first conversion member 52 connected to the liquid inlet channel 23 and a second conversion member 53 connected to the air inlet channel 24. The operating part 50a drives the first conversion member 52 and the second conversion member 53 to move synchronously to change the size of the air inlet volume of the air inlet channel 24 and the size of the liquid inlet volume of the liquid inlet channel 23, that is, the first conversion member 52 moves relative to the hollow body 20 to change the size of the liquid inlet volume of the liquid inlet channel 23, and the second conversion member 53 moves relative to the hollow body 20 to change the size of the air inlet volume of the air inlet channel 24. By setting two conversion members to change the size of the liquid inlet volume of the liquid inlet channel 23 and the size of the air inlet volume of the air inlet channel 24 respectively, the air inlet volume can be selected while selecting the liquid inlet volume, or the air inlet volume can be selected while selecting the air inlet volume, so that the air inlet volume and the air inlet volume can be set at appropriate gears to make beverages of various flavors. Among them, the size of the liquid inlet volume of the liquid inlet channel 23 and the size of the air inlet volume of the air inlet channel 24 are in a preset corresponding relationship, and the preset corresponding relationship is the same as the above embodiment.

[0068] The liquid inlet channel 23 and the air inlet channel 24 are connected to different positions of the mixing chamber 21, that is, the liquid and the gas enter the mixing chamber 21 in an independent manner, so that the interval setting between the variable flow portion and the variable liquid flow portion is achieved. For example, the liquid inlet channel 23 connected to the liquid inlet of the mixing chamber 21 and the air inlet channel 24 connected to the air inlet of the mixing chamber 21 are arranged at intervals, which can be arranged at intervals along the circumference of the hollow body 20, or can be arranged at intervals along the axial direction of the hollow body 20.

[0069] In this embodiment, the operating part 50a is in transmission connection with the second conversion member 53, and the second conversion member 53 is in transmission connection with the first conversion member 52, so that the first conversion member 52 and the second conversion member 53 can move synchronously to adjust the liquid inlet amount and the air inlet amount at the same time. The first conversion member 52 and the second conversion member 53 can be driven to move synchronously by one operating part 50a, so that the liquid inlet amount of the liquid inlet channel 23 and the air inlet amount of the air inlet channel 24 can be adjusted at the same time, which is more convenient for users to use. The operating part 50a can not only change the air supply amount, but also change the liquid supply amount synchronously. The air supply amount and the liquid supply amount are changed simultaneously, so that milk froth with different temperatures and guaranteed quality can be generated, and the output of hot and cold milk froth can be achieved, so as to meet the needs of different users for more flavors.

[0070] Among them, the second conversion member 53 is configured as a driving member, and the first conversion member 52 is configured as a driven member, making the structural connection more convenient. In other feasible solutions, it is also possible that the operating portion 50a is drivingly connected to the first conversion member 52, and the first conversion member 52 is drivingly connected to the second conversion member 53, that is, the operating portion 50a directly drives the first conversion member 52, and the operating portion 50a indirectly drives the second conversion member 53 through the first conversion member 52. In other embodiments, it is also possible to directly drive the first conversion member 52 and the second conversion member 53 by the operating portion 50a. For example, the operating portion 50a drives the first conversion member 52 to rotate and the second conversion member 53 to rotate simultaneously through gears, or the operating portion 50a drives the first conversion member 52 to rotate and the second conversion member 53 to move simultaneously. It is also possible that there is no direct driving relationship between the first conversion member 52 and the second conversion member 53, and the operating portion 50a drives one of the first conversion member 52 and the second conversion member 53 to rotate and drives the other to move.

[0071] Specifically, the second conversion member 53 extends into the intake passage 24 along the extending direction of the intake passage 24, and the second conversion member 53 rotates around the center line of the intake passage 24 to drive the first conversion member 52 to linearly move along the extending direction of the intake passage 24. By driving the first conversion member 52 to move through the rotation of the second conversion member 53 extending into the intake passage 24, when the operating portion 50a selects different flavors of milk foam output, the movement of the first conversion member 52 and the second conversion member 53 is more reliable, and the adjustment of the operating portion 50a is smoother.

[0072] A first opening 233 is provided on the liquid inlet passage 23. The first conversion member 52 is inserted into the liquid inlet passage 23 from the first opening 233. The intake passage 24 has a second opening 243. The second conversion member 53 extends into the intake passage 24 from the second opening 243. The first opening 233 and the second opening 243 face the same direction. By providing the first opening 233 and the second opening 243 facing the same direction, the installation of the first conversion member 52 and the second conversion member 53 is more convenient.

[0073] Among them, a through port 236 cooperating with the first conversion member 52 is provided in the liquid inlet passage 23. The first conversion member 52 changes the liquid inflow amount of the liquid inlet passage 23 by adjusting the fluid passage area of the through port 236. The cooperation between the first conversion member 52 and the through port is configured as a variable liquid flow portion. By changing the liquid inflow amount of the liquid inlet passage 23 in a stepless adjustment manner, more choices can be provided to the user.

[0074] A cylindrical seal 244a is provided in the intake passage 24. A through hole is provided at the bottom of the seal 244a. A longitudinally extending and gradually changing intake groove 511a is provided on the outer wall of the second conversion member 53. A sealing rib 245a is provided on the inner wall of the seal 244a. The gradually changing intake groove 511a communicates with the intake passage 24 through the through hole. The sealing rib 245a cooperates with the gradually changing intake groove 511a to change the intake air volume of the intake passage 24. The cooperating portion of the sealing rib 245a and the gradually changing intake groove 511a constitutes an air flow variable portion. The sealing rib 245a extends along both the circumferential and axial directions of the seal 244a. Thus, when the first conversion member 52 rotates relative to the seal 244a, the position where the gradually changing intake groove 511a cooperates with the sealing rib 245a is different, and the cross-sectional area of the intake groove changes, realizing the adjustment of the intake air volume. Among them, when the second conversion member 53 rotates in two opposite directions from a preset position, the change in the cross-sectional area of the intake groove is the same, and it can be switched to another gear along two directions, facilitating the user to select a gear.

[0075] In this embodiment, the operation portion 50a is configured as a knob. The knob is integrally provided or fixedly connected to the second conversion member 53. A guide post 531 is provided on the second conversion member 53. The first conversion member 52 includes a cam groove 521. The guide post 531 is inserted into the cam groove 521. When the knob drives the second conversion member 53 to rotate, the cam groove 521 drives the first conversion member 52 to move linearly under the guidance of the guide post 531. Specifically, the first conversion member 52 includes a switching rod 522 and a guide rod 523 arranged at intervals. The switching rod 522 extends into the liquid inlet passage 23 from the first opening 233 and is used to adjust the fluid passage area of the through port 236 to change the liquid inlet volume of the liquid inlet passage 23. The guide rod 523 extends into the guide cylinder 125 to guide the linear movement of the switching rod 522, making the movement of the switching rod 522 more reliable. The end of the first conversion member 52 extends into the liquid inlet passage 23 and a flow-through groove 524 is provided at this end, that is, a flow-through groove 524 is provided at the end of the switching rod 522. The flow-through groove 524 is configured as a groove with a gradually changing cross-section. The linear movement of the first conversion member 52 can adjust the communication area between the flow-through groove 524 and the through port 236, thereby controlling the liquid supply volume. The flow-through groove 524 is configured as a gradually changing groove, which can achieve a larger range of adjustment with a shorter movement distance of the first conversion member 52. The overall structure is compact, avoiding structural instability caused by a long-distance movement, and thus making the operation more reliable.

[0076] The emulsifying device 200 is configured as a milk can, which includes a tank body 11 and a cover assembly 12 covering the upper part of the tank body 11. The tank body 11 has a liquid storage cavity for containing liquid, and a hollow body 20 is arranged on the cover assembly 12. An installation opening 123a for defining a second conversion member 53 is provided outside the cover assembly 12. The knob is connected to the second conversion member 53 through the installation opening 123a, and the second conversion member 53 is in transmission connection with the first conversion member 52 inside the cover assembly 12. By only operating the knob on the milk can, the knob drives the second conversion member 53 to rotate and drives the first conversion member 52 to move linearly, so that the synchronous movement of the two conversion members can be realized, which is convenient for adjusting the corresponding relationship between the air supply amount and the liquid supply amount. For example, as the liquid supply amount increases, the air supply amount increases synchronously. The knob can be adjusted corresponding to the gears, and the user only needs to select the corresponding gear to obtain a drink with a suitable temperature.

[0077] Referring to Figures 15 to 21 As shown, this is the fourth preferred embodiment of the present invention. The components with the same reference numerals as those in the third embodiment have similar structures and functions, and will not be described in detail here.

[0078] The emulsifying device 400 includes a switching structure. The switching structure includes a first conversion member 52b connected to the liquid inlet channel 23 and a second conversion member 53b connected to the air inlet channel 24b. The operating part 50b drives the first conversion member 52b and the second conversion member 53b to move synchronously to change the air intake amount of the air inlet channel 24b and the liquid intake amount of the liquid inlet channel 23, that is, the first conversion member 52b moves relative to the hollow body 20 to change the liquid intake amount of the liquid inlet channel 23, and the second conversion member 53b moves relative to the hollow body 20 to change the air intake amount of the air inlet channel 24b. By setting two conversion members to respectively change the liquid intake amount of the liquid inlet channel 23 and the air intake amount of the air inlet channel 24b, the air intake amount can be selected while selecting the liquid intake amount, or the liquid intake amount can be selected while selecting the air intake amount, so that the air intake amount and the air intake amount can be set at appropriate gears to make various drinks with different flavors. Among them, the liquid intake amount of the liquid inlet channel 23 and the air intake amount of the air inlet channel 24b have a preset corresponding relationship, and this preset corresponding relationship is the same as that in the above embodiment.

[0079] In this embodiment, the operation part 50b is drivingly connected to the second conversion part 53b, and the operation part 50b or the second conversion part 53b is drivingly connected to the first conversion part 52b. That is to say, by one operation part 50b, the first conversion part 52b and the second conversion part 53b are driven to move synchronously, so that the liquid inlet volume of the liquid inlet channel 23 and the air inlet volume of the air inlet channel 24b can be adjusted simultaneously, which is more convenient for users. By the operating member, not only the air supply volume can be changed, but also the liquid supply volume can be changed synchronously. When the air supply volume and the liquid supply volume are changed simultaneously, milk foams with different temperatures and ensured quality can be generated, and the output of cold and hot milk foams can be realized, which can meet the needs of different users for more flavors. For example, cold milk foam with a temperature in the range of 10°C to 30°C and hot milk foam with a temperature in the range of 40°C to 70°C.

[0080] Preferably, the operation part 50b and the second conversion part 53b are integrally provided or at least circumferentially fixedly connected. The operation part 50b drives the second conversion part 53b to rotate to change the air inlet volume of the air inlet channel 24b, and the operation part 50b or the second conversion part 53b drives the first conversion part 52b to move to change the liquid inlet volume of the liquid inlet channel 23. The liquid inlet volume of the liquid inlet channel 23 and the air inlet volume of the air inlet channel 24b have a preset corresponding relationship. The preset corresponding relationship is the same as that in the above embodiment.

[0081] Specifically, the air inlet channel 24b includes a first section 241 and a second section 242 that are angled to each other. The first section 241 and the second section 242 are arranged along the direction of air inflow. The second conversion part 53b extends into the air inlet channel 24b along a direction perpendicular to the extension of the first section 241. The second conversion part 53b rotates relative to the air inlet channel 24b, and the operation part 50b or the second conversion part 53b drives the first conversion part 52b to move linearly. By setting the air inlet channel 24b as the first section 241 and the second section 242 that are angled to each other, the structure of the air inlet channel 24b can be made more compact, which is convenient for connecting with the first conversion part 52b.

[0082] A first opening 233b is provided on the liquid inlet channel 23, and the first conversion part 52b is inserted into the liquid inlet channel 23 from the first opening 233b. A second opening 243b is provided on the first section 241 of the air inlet channel 24b, and the second conversion part 53b is inserted into the air inlet channel 24b from the second opening 243b. The first opening 233b and the second opening 243b face the same direction. By setting the first opening 233b and the second opening 243b facing the same direction, the installation of the first conversion part 52b and the second conversion part 53b is more convenient. By the rotation of the second conversion part 53b inserted into the air inlet channel 24b to drive the first conversion part 52b to move, when different flavors of milk foam are selected through the operation part 50b, the movement of the first conversion part 52b and the second conversion part 53b is more reliable, and the adjustment of the operation part 50b is smoother.

[0083] Among them, a through port 236b that cooperates with the first conversion member 52b is provided in the liquid inlet passage 23. The first conversion member 52b changes the liquid inlet volume of the liquid inlet passage 23 by adjusting the fluid passage area of the through port 236b. The cooperation between the first conversion member 52b and the through port 236b is configured as a variable liquid flow portion. By changing the liquid inlet volume of the liquid inlet passage 23 in a stepless adjustment manner, more choices can be provided to the user.

[0084] In this embodiment, the operation portion 50b is configured as a knob. A cam groove 521b is provided on the outer circumference of the knob. A guide post 531b inserted into the cam groove 521b is provided on the first conversion member 52b. While the knob drives the second conversion member 53b to rotate, the guide post 531b drives the first conversion member 52b to move linearly under the guidance of the cam groove 521b. The knob drives the second conversion member 53b to rotate and drives the first conversion member 52b to move linearly, which can realize the synchronous movement of the two conversion members, facilitating the adjustment of the corresponding relationship between the air supply volume and the liquid supply volume. For example, as the liquid supply volume increases, the air supply volume increases synchronously. The knob can be adjusted corresponding to the gears, and the user only needs to select the corresponding gear to obtain a drink with a suitable temperature.

[0085] The emulsifying device 400 further includes a base body 32 that cooperates with the second conversion member 53b. An air gap 33 is formed between the second conversion member 53b and the base body 32 (refer to Figure 20 ), and the air inlet passage 24b establishes an air supply path to the mixing chamber 21 through the air gap 33. The second conversion member 53b can be operably moved relative to the base body 32 to change the air supply volume from the air inlet passage 24b to the mixing chamber 11 by adjusting the communication area of the air gap 33. The air gap 33 is configured as a variable air flow portion.

[0086] By providing the second conversion member 53b and the base body 32 that cooperates with it, the communication area of the air gap 33 can be changed by operating the second conversion member 53b to move. The installation direction of the second conversion member 53b forms an angle with the extending direction of the corresponding air inlet passage 24b. The cooperation accuracy between the second conversion member 53b and the base body 32 is high, so that the adjustment of the air supply volume is more accurate, the quality of the milk foam generated by the emulsifying device is stable, and the product consistency is good. Milk foams with different fineness degrees can be selected, thus meeting the user's pursuit of coffee taste.

[0087] Refer to Figures 16 to 20, a communication groove 321 extending through the substrate 32 in the first direction is formed on the substrate 32. A convex block 533 that fits against the bottom of the communication groove 321 is provided on the second conversion member 53b. An air gap 33 is formed between the convex block 533 and the side wall of the communication groove 321. The second conversion member 53b rotates to drive the convex block 533, so that the distance between the outer peripheral surface of the convex block 533 and the side wall of the communication groove 321 changes. The air gap 33 is formed between the outer peripheral surface of the convex block 533 and the side wall surface of the communication groove 321, which can be more precise in technology and convenient for manufacturing, and can reduce the manufacturing cost under the condition of better controlling the air supply volume.

[0088] Preferably in this embodiment, the convex block 533 has an elliptical outer peripheral surface or a cam-shaped outer peripheral surface. A raised portion 322 is provided at the bottom of the communication groove 321, and the convex block 533 fits against the raised portion 322. The convex block 533 is provided with an elliptical outer peripheral surface or a cam-shaped outer peripheral surface, which can make the area of the air gap 33 change regularly during the rotation of the convex block 533. The raised portion 322 at the bottom of the groove fits against the convex block 533, which can better seal the gap between the convex block 533 and the bottom of the groove, ensuring that air can only pass through the air gap 33 and guaranteeing the consistency of the air supply volume.

[0089] The first section 241 of the air inlet passage 24b extends along the first direction, and the second section 242 extends along the second direction. The second conversion member 53b rotates relative to the substrate 32 around an axis perpendicular to the first direction. The air inlet passage 24b is composed of two angled sections, which can provide sufficient space for the arrangement of the second conversion member 53b and the substrate 32, and the arrangement between the second conversion member 53b and the air inlet passage 24b is more compact.

[0090] Continue to refer to Figure 16, in this embodiment, the emulsifying device 400 is configured as a milk can, which includes a can body 11 and a cover assembly 12 covering the upper part of the can body 11. The can body 11 has a liquid storage cavity for containing liquid, and the hollow body 20 is arranged on the cover assembly 12; a bracket 41 for supporting the first section 241 is arranged inside the cover assembly 12, and an operating part 50b for connecting the second conversion part 53b is arranged outside the cover assembly 12. An installation opening 123b corresponding to the position of the second opening 243b is arranged on the cover assembly 12. The operating part 50b is connected to the second conversion part 53b through the installation opening 123b. The operating part 50b or the second conversion part 53b is in transmission connection with the first conversion part 52b outside the cover assembly 12, and a through hole for the first conversion part 52b to pass through can be arranged on the cover assembly 12. By directly operating the operating part 50b on the milk can to adjust the air supply amount, gear marks can be set around the operating part 50b for convenient adjustment. The hollow body 20 is arranged on the cover assembly 12, and the space of the cover assembly 12 can be utilized to make the overall structure of the milk can simple and compact. Among them, the cover assembly 12 includes an upper cover 121 and a lower cover 122. An accommodation space is defined between the upper cover 121 and the lower cover 122. The hollow body 20 is arranged in the accommodation space, and the air inlet channel 24b is also arranged in the accommodation space to prevent foreign objects from entering the mixing chamber from the air inlet channel.

[0091] The first section 241 of the air inlet channel 24b can be supported on the bracket 41, and a fixing part 42 is connected to the bracket 41. The fixing part 42 presses the second conversion part 53b towards the base body 32. A hook 421 extends towards the bracket 41 on the fixing part 42, and a corresponding slot 411 is arranged on the bracket 41. The hook 421 is inserted into the corresponding slot 411 to connect the fixing part 42 to the bracket 41, and the second conversion part 53b is limited by the fixing part 42. Preferably, the operating part 50b is connected to the fixing part 42. Along the rotation axis of the second conversion part 53b, the operating part 53b is limited by the fixing part 42. The fixing part 42 clamps the operating part 53b axially and presses the second conversion part 53b through the operating part 50b, that is, the fixing part 42 restricts the second conversion part 53b from moving away from the base body 32 through the operating part 50b to ensure that the second conversion part 53b is in close contact with the bottom of the communication groove 321 on the base body 32.

[0092] In the above embodiment, the second conversion part can also be set to include a plurality of air flow channels connected to the air inlet channel. The cross-sectional areas of the plurality of air flow channels are different, and the plurality of air flow channels are configured as an air flow variable part. By switching one of the plurality of air flow channels to communicate with the mixing chamber, the air intake amount of the air inlet channel can be changed. That is, the stepwise adjustment of the air intake amount can be realized, which can make the air intake control more accurate, the quality of the milk foam generated by the emulsifying device stable, and the product consistency better.

[0093] The present invention also relates to a beverage machine, which includes an emulsifying device according to any one of the above embodiments, and a steam channel 22 of the emulsifying device is in communication with the beverage machine. The beverage machine can generate a steam source, and when the steam channel 22 of the emulsifying device is in communication with the beverage machine, the beverage machine provides steam to the emulsifying device.

[0094] By providing two conversion components to respectively change the liquid inlet volume of the liquid inlet channel and the gas inlet volume of the gas inlet channel, the user can independently select different combinations of gas inlet volumes and liquid inlet volumes, and can also select the gas inlet volume while selecting the liquid inlet volume, or select the liquid inlet volume while selecting the gas inlet volume, so that the gas inlet volume and the liquid inlet volume can be set at appropriate gears to make various beverages with different flavors. In particular, the production of cold milk foam and hot milk foam can be achieved, thus meeting the needs of users. In addition, the production of cold milk foam and hot milk foam is carried out by using the same emulsifying device. Only the corresponding operating part needs to be operated, and there is no need to replace components, which is convenient to use and has a lower cost.

[0095] It should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0096] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An emulsifying device, comprising a hollow body having a mixing chamber, the mixing chamber communicating with a steam channel, a liquid inlet channel, an air inlet channel and an outlet channel, the steam channel being used to communicate with a steam source, the liquid inlet channel being used to communicate with a liquid storage source, the air inlet channel being used to communicate with air, and the outlet channel being used to output a mixed fluid generated in the mixing chamber based on the Venturi effect; It is characterized in that: It further includes a switching structure connecting the liquid inlet channel and the air inlet channel and an operating part for driving the switching structure. The switching structure is inserted into the liquid inlet channel and the air inlet channel to form a variable liquid flow part and a variable air flow part respectively. The operating part drives the switching structure to move to change the liquid inflow amount of the liquid inlet channel through the variable liquid flow part and change the air inflow amount of the air inlet channel through the variable air flow part.

2. The emulsifying device according to claim 1, characterized in that, The variable air flow part and the variable liquid flow part are arranged at intervals, and are separated by an air groove. The air groove communicates with the liquid inlet channel, and air enters the mixing chamber together with the liquid in the liquid inlet channel after passing through the variable air flow part and the air groove in sequence.

3. The emulsifying device according to claim 1, characterized in that, The switching structure includes a plurality of connecting channels arranged between the liquid inlet channel and the mixing chamber. The cross-sectional areas of the plurality of connecting channels are different, and the plurality of connecting channels are configured as the variable liquid flow part. By switching one of the plurality of connecting channels to communicate with the mixing chamber, the liquid inflow amount of the liquid inlet channel is changed.

4. The emulsifying device according to claim 2, wherein, Each connecting channel has an upstream opening and a downstream opening, and at least one of the upstream opening and the downstream opening communicates with the air groove, and air enters the mixing chamber together with the liquid in the connecting channel from the air groove.

5. The emulsifying device according to claim 1, characterized in that, The switching structure includes a single conversion member connecting the liquid inlet channel. The single conversion member extends into the air inlet channel along the extension direction of the air inlet channel. When the single conversion member moves relative to the hollow body, the air inflow amount of the air inlet channel and the liquid inflow amount of the liquid inlet channel are changed, and the liquid inflow amount of the liquid inlet channel and the air inflow amount of the air inlet channel have a preset corresponding relationship.

6. The emulsifying device according to claim 5, wherein, The single conversion member is provided with a plurality of connecting channels. The cross-sectional areas of the plurality of connecting channels are different, and the plurality of connecting channels are configured as the variable liquid flow part. The single conversion member drives one of the plurality of connecting channels to communicate with the liquid inlet channel to change the liquid inflow amount of the liquid inlet channel.

7. The emulsifying device according to claim 6, characterized in that, The single conversion member is configured as a cylindrical shape. The single conversion member extends from the air inlet channel into the liquid inlet channel. The plurality of connecting channels are arranged at intervals along the circumferential direction and penetrate through the single conversion member in the radial direction. The single conversion member rotates relative to the hollow body to select a connecting channel communicating with the liquid inlet channel.

8. The emulsifying device according to claim 6, characterized in that, The emulsifying device further includes a seal member at least partially extending into the intake passage, the seal member being sleeved around the periphery of the single conversion member. A longitudinally extending variable cross-section intake groove is provided on one of the inner wall of the seal member and the outer wall of the single conversion member, and a sealing rib is provided on the other of the inner wall of the seal member and the outer wall of the single conversion member. The mating portion of the sealing rib and the variable cross-section intake groove constitutes the variable airflow portion.

9. The emulsifying device according to claim 8, wherein, A communication groove is provided between the variable cross-section intake groove and the plurality of connection channels. The communication groove includes an annular groove and a plurality of air grooves respectively communicating with the plurality of connection channels one by one. The annular groove extends along the circumferential direction of the single conversion member and axially communicates with the variable cross-section intake groove and the plurality of air grooves respectively.

10. The emulsifying device according to claim 9, characterized in that, The variable cross-section intake groove is configured as a stepped groove, the number of steps of the stepped groove being the same as and corresponding one by one to the number of the plurality of connection channels. The sealing rib is configured as a stepped sealing rib corresponding to the stepped groove.

11. The emulsifying device according to claim 1, characterized in that, The switching structure includes a first conversion member connected to the liquid inlet passage and a second conversion member connected to the intake passage. The operating portion drives the first conversion member and the second conversion member to move synchronously to change the intake air volume of the intake passage and the liquid inlet volume of the liquid inlet passage. The liquid inlet volume of the liquid inlet passage has a preset corresponding relationship with the intake air volume of the intake passage.

12. The emulsifying device according to claim 11, wherein The operating portion is in transmission connection with the first conversion member or the second conversion member, and the first conversion member and the second conversion member are in transmission connection; or the operating portion is respectively in transmission connection with the first conversion member and the second conversion member.

13. The emulsifying device according to claim 11 or 12, characterized in that, The first conversion member and the second conversion member are in transmission connection. The second conversion member is configured as a driving member, and the first conversion member is configured as a driven member.

14. The emulsifying device according to claim 11, characterized in that, The second conversion member extends into the intake passage along the extending direction of the intake passage, and the second conversion member rotates around the center line of the intake passage to drive the first conversion member to move linearly.

15. The emulsifying device according to claim 11, characterized in that, The second conversion member extends into the intake passage along a direction perpendicular to the extension of the intake passage, and the second conversion member rotates relative to the hollow body to drive the first conversion member to move linearly.

16. The emulsifying device according to claim 11, wherein The liquid inlet passage and the intake passage communicate with different positions of the mixing chamber. A first opening is provided on the liquid inlet passage, and the first conversion member extends into the liquid inlet passage from the first opening. The intake passage has a second opening, and the second conversion member extends into the liquid inlet passage from the second opening. The orientations of the first opening and the second opening are the same.

17. The emulsifying device according to claim 11, characterized in that, A through port cooperating with the first conversion member is provided in the liquid inlet passage. The mating portion of the first conversion member and the through port is configured as the variable liquid flow portion. The first conversion member changes the liquid inlet volume of the liquid inlet passage by adjusting the fluid passing area of the through port.

18. The emulsifying device according to claim 11, wherein, The first conversion member includes a plurality of air flow channels connected to the intake passage. The plurality of air flow channels are configured as the variable airflow portion. The channel cross-sectional areas of the plurality of air flow channels are different, and the intake air volume of the intake passage is changed by switching different air flow channels to communicate with the mixing chamber.

19. The emulsifying device according to claim 1, characterized in that, It further includes a tank body and a cover assembly covering the upper part of the tank body. The tank body has a liquid storage cavity for containing liquid, and the hollow body is arranged on the cover assembly. An installation opening is provided on the outer part of the cover assembly, and the switching mechanism passes through the installation opening and is connected to the operation part. The operation part is configured as a knob, and the knob drives the switching mechanism to move so as to simultaneously change the liquid inlet volume of the liquid inlet channel and the air inlet volume of the air inlet channel.

20. A beverage machine, characterized in that, It includes an emulsifying device according to any one of claims 1 to 19, and a steam channel of the emulsifying device is communicated with the beverage machine.

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