Mixing device and coffee machine

Abstract

The utility model discloses a mixing device, which comprises a box body, a stirring device and a stirring device, the sealing piece is arranged on the outer wall of the box body, the sealing piece and the box body are matched to form a liquid conveying channel, the liquid conveying channel comprises a channel inlet and a channel outlet, and the channel inlet communicates with the liquid containing cavity; the venturi structure is connected to the channel outlet, the venturi structure comprises a mixing cavity and a steam channel communicated with the mixing cavity, and the channel outlet is communicated with the mixing cavity; the mixing device further comprises a gas channel, the gas channel is communicated with the mixing cavity, a one-way valve is arranged in the gas channel, and the one-way valve is opened based on negative pressure formed in the mixing cavity to allow air to enter the mixing cavity. The sealing piece and the box body are connected to form the liquid conveying channel, and the one-way valve is arranged in the gas channel, so that milk / milk foam is prevented from overflowing from the gas channel to block the air inlet hole at the upstream of the one-way valve on the premise of not influencing the air to enter the mixing cavity, and the milk foam making effect and stability are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of beverage preparation, in particular to a mixing device and a coffee machine. Background Art

[0002] The mixing device heats and / or foams the liquid by using steam. When foaming the liquid, gas needs to be supplied to the liquid and the liquid is mixed with the gas. In many cases, the liquid to be foamed is milk.

[0003] During the process of foaming milk, the gas is mixed with the milk to obtain the required milk foam. Under the influence of steam, the temperature of the milk increases. In practical applications, the mixing device is frequently used, and the holes or channels for supplying gas may be contaminated. In many cases, the holes or channels are relatively narrow and are particularly prone to being blocked by milk fat and bacterial growth in the milk, thus affecting the effect and stability of milk foam production. Moreover, it is difficult to clean the holes or channels due to their small cross-sectional area. Especially in the field of making coffee and coffee-containing beverages, it is necessary to be able to clean the parts in contact with milk in a user-friendly manner and avoid blockage of the air inlet holes. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mixing device that is convenient to clean and reliable in use.

[0005] The purpose of the utility model is to provide a coffee machine that is convenient to clean and reliable in use.

[0006] To achieve the above-mentioned utility model purpose, the utility model provides a mixing device, comprising:

[0007] A box body defining a liquid containing cavity;

[0008] A seal configured on the outer wall of the box body, the seal cooperating with the box body to form a liquid delivery channel, the liquid delivery channel including a channel inlet and a channel outlet, the channel inlet communicating with the liquid containing cavity;

[0009] A Venturi structure connected to the channel outlet, the Venturi structure including a mixing cavity and a steam channel communicating with the mixing cavity, the channel outlet communicating with the mixing cavity;

[0010] The mixing device further includes a gas channel communicating with the mixing cavity, and a one-way valve is provided in the gas channel, and the one-way valve is opened based on the negative pressure formed in the mixing cavity to allow air to enter the mixing cavity.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: The liquid delivery channel formed by the engagement of the seal and the box body solves the problem that traditional milk tubes are not easy to clean. And by providing a one-way valve in the gas channel, the one-way valve opens based on the negative pressure formed in the mixing cavity to allow air to enter, which can prevent milk / milk foam from overflowing from the gas channel and blocking the air inlet hole upstream of the one-way valve without affecting the entry of air into the mixing cavity, thereby ensuring the effect and stability of milk foam production.

[0012] As a further improvement of an embodiment of the present utility model, the liquid delivery channel includes a narrow channel portion, and the narrow channel portion is located between the channel inlet and the channel outlet; the cross-sectional area of the liquid delivery channel is the smallest at the narrow channel portion; the position where the gas channel communicates with the liquid delivery channel is located between the channel outlet and the narrow channel portion.

[0013] As a further improvement of an embodiment of the present utility model, the liquid delivery channel further includes a guiding portion, the guiding portion is provided at at least one end of the narrow channel portion along the liquid flow direction, and the slope of the guiding portion is less than 1:1.

[0014] As a further improvement of an embodiment of the present utility model, the liquid delivery channel includes a wide channel portion between the channel inlet and the narrow channel portion, and the ratio of the cross-sectional area of the narrow channel portion to the cross-sectional area of the wide channel portion is between 1:3 and 1:7.

[0015] As a further improvement of an embodiment of the present utility model, the mixing device further includes a support seat provided with the Venturi structure, the support seat is detachably connected to the box body, and the seal is provided on the support seat;

[0016] The gas channel includes an intake main channel, the intake main channel is provided on the support seat, and the one-way valve is provided in the intake main channel.

[0017] As a further improvement of an embodiment of the present utility model, the support seat includes a constriction portion forming the mixing cavity, and the intake main channel is provided in the relief space of the constriction portion.

[0018] As a further improvement of an embodiment of the present utility model, the intake main channel is provided horizontally on the support seat, and the horizontal position of the center line of the intake main channel is higher than the horizontal position of the center line of the steam channel.

[0019] As a further improvement of an embodiment of the present utility model, the intake main channel includes a connected connecting channel portion and an installation channel portion, and the one-way valve is provided in the installation channel portion;

[0020] Along the direction in which the gas flows into the mixing chamber, the connecting channel portion is disposed between the mounting channel portion and the mixing chamber, and a descending step portion is formed between the mounting channel portion and the connecting channel portion.

[0021] As a further improvement of an embodiment of the present invention, the main air inlet channel includes a connected connecting channel portion and a mounting channel portion. Along the direction in which the gas flows into the mixing chamber, the connecting channel portion is disposed downstream of the mounting channel portion. The connecting channel portion is disposed between the mounting channel portion and the mixing chamber. The one-way valve is disposed in the mounting channel portion, and the mounting channel portion is disposed on the support seat in the vertical direction.

[0022] As a further improvement of an embodiment of the present invention, the mixing device further includes a sealing sheet disposed in the main air inlet channel. Along the direction in which the gas flows into the mixing chamber, the sealing sheet is disposed upstream of the one-way valve; the sealing sheet has an air inlet hole, and the one-way valve communicates with external air through the air inlet hole; a sealing plug is installed at the inlet end of the main air inlet channel, and the sealing sheet and the one-way valve are fixed in the main air inlet channel through the sealing plug.

[0023] As a further improvement of an embodiment of the present invention, the gas channel communicates with the mixing chamber through the channel outlet. The gas channel includes an air passage opening located on the sealing member, and the horizontal height of the air passage opening is higher than or equal to the horizontal height of the channel outlet.

[0024] As a further improvement of an embodiment of the present invention, the mixing device further includes a support seat for setting the Venturi structure. The support seat is detachably connected to the box body, and the sealing member is disposed on the support seat;

[0025] The gas channel includes a main air inlet channel and a secondary air inlet channel. The main air inlet channel is disposed on the support seat, and the sealing member and the box body cooperate to further form the secondary air inlet channel. The secondary air inlet channel communicates with the main air inlet channel through the air passage opening.

[0026] As a further improvement of an embodiment of the present invention, the gas channel includes a secondary air inlet channel. The sealing member and the box body cooperate to further form the secondary air inlet channel. The secondary air inlet channel extends from the air passage opening to the channel outlet.

[0027] As a further improvement of an embodiment of the present invention, the secondary air inlet channel extends downward and bends from the air passage opening to a preset position to communicate with the liquid delivery channel, and the horizontal height of the preset position is lower than the horizontal height of the channel outlet.

[0028] As a further improvement of an embodiment of the present utility model, the outer wall of the box body is provided with a first rib and a second rib. The first rib abuts against the sealing member to form the liquid delivery channel, and the second rib abuts against the sealing member to form the air intake secondary channel. The channel inlet and the channel outlet are surrounded by the first rib, and the air through-hole is surrounded by the second rib. The first rib and the second rib form a closed figure on the outer wall of the box body.

[0029] As a further improvement of an embodiment of the present utility model, the bottom of the liquid accommodation cavity is provided with a recess, and the position of the recess corresponds to that of the channel inlet.

[0030] The present utility model also relates to a coffee machine, which includes the mixing device according to any one of the above embodiments. The coffee machine includes a front panel connected to an outlet assembly, and the mixing device is detachably connected to the front panel and is located on one side of the outlet assembly. Description of the Drawings

[0031] Figure 1 is a schematic diagram of a mixing device according to an embodiment of the present utility model.

[0032] Figure 2 is Figure 1 a cross-sectional schematic diagram of the mixing device in [reference number] along line A-A.

[0033] Figure 3 is Figure 1 a three-dimensional schematic diagram of the box body of the mixing device in [reference number].

[0034] Figure 4 is Figure 1 a three-dimensional schematic diagram of one perspective of the support base of the mixing device in [reference number].

[0035] Figure 5 is Figure 1 a three-dimensional schematic diagram of another perspective of the support base of the mixing device in [reference number].

[0036] Figure 6 is Figure 1 a cross-sectional schematic diagram of the mixing device in [reference number] along line B-B.

[0037] Figure 7 is Figure 6 an enlarged schematic diagram of part a of the mixing device in [reference number].

[0038] Figure 8 is Figure 6 a cross-sectional schematic diagram of the mixing device in [reference number] along line C-C.

[0039] Figure 9 is a schematic diagram of a mixing device according to another embodiment of the present utility model.

[0040] Figure 10 is Figure 9 A schematic cross-sectional view of the mixing device in [device name] along line D-D.

[0041] Figure 11 is Figure 9 A three-dimensional schematic view of the box body of the mixing device in [device name].

[0042] Figure 12 is Figure 9 A partial three-dimensional schematic view of the support base of the mixing device in [device name].

[0043] Figure 13 is Figure 10 A partial cross-sectional view of the mixing device in [device name] along line E-E.

[0044] Figure 14 is a schematic view of one of the box bodies of the mixing device according to an embodiment of the present utility model.

[0045] Figure 15 is a schematic view of another box body of the mixing device according to an embodiment of the present utility model.

[0046] Figure 16 is a schematic view of yet another box body of the mixing device according to an embodiment of the present utility model.

[0047] Figure 17 is a schematic view of still another box body of the mixing device according to an embodiment of the present utility model.

[0048] Figure 18 is a schematic view of a coffee machine according to an embodiment of the present utility model.

[0049] The repeated use of reference numerals in this specification and the drawings is intended to represent the same or similar features or elements of the present application. Detailed Embodiments

[0050] The present utility model will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, these embodiments do not limit the present utility model, and any structural, methodical, or functional changes made by those of ordinary skill in the art based on these embodiments are included within the scope of protection of the present utility model.

[0051] It should be understood that the terms indicating relative spatial positions used herein, such as "upper", "above", "lower", "below", etc., are for the purpose of facilitating description of the relationship of one unit or feature to another unit or feature as shown in the accompanying drawings. The terms indicating relative spatial positions may be intended to include different orientations of the device in use or operation other than the orientations shown in the figures. The terms "first", "second", and "third" used herein may be used interchangeably to distinguish one component from another, and these terms are not intended to indicate the position or importance of each component. The terms "upstream" and "downstream" refer to the relative direction with respect to the fluid flow in the fluid passage. For example, "upstream" refers to the direction from which the fluid flows, and "downstream" refers to the direction to which the fluid flows.

[0052] Taking the mixing device 100 for a coffee machine as an example, the specific implementation manner of the present utility model will be described. Refer to Figures 1 to 4 As shown, in this embodiment, the mixing device 100 includes a box body 20 and a seal 31. The box body 20 defines a liquid containing cavity 21, and milk or other liquids to be mixed can be stored in the liquid containing cavity 21. The box body 20 includes a box bottom 201 and a surrounding wall 202, and the box bottom 201 and the surrounding wall 202 enclose to form the liquid containing cavity 21. The seal 31 is detachably arranged on the outer wall of the box body 20, that is, on the outer side of the surrounding wall 202 of the box body 20. The seal 31 and the box body 20 cooperate to form a liquid delivery channel 23. The liquid delivery channel 23 is arranged outside the liquid containing cavity 21, and there is no need to provide a separate liquid delivery pipe inside the box body 20, thus forming a design without a milk pipe. The seal 31 and the outer wall of the box body 20 can be hermetically connected to form the liquid delivery channel 23. The liquid delivery channel 23 is formed by two open parts. When the seal 31 and the box body 20 are disassembled, the two open parts forming the liquid delivery channel 23 are separated, and the liquid delivery channel 23 can be conveniently and deeply cleaned.

[0053] The liquid delivery channel 23 includes a channel inlet 231 and a channel outlet 232 which are oppositely arranged. The channel inlet 231 communicates with the liquid containing cavity 21, and the liquid in the liquid containing cavity 21 can enter the liquid delivery channel 23 through the channel inlet 231. When the mixing device 100 is placed on a horizontal plane, the direction perpendicular to the horizontal plane is defined as the up-down direction, that is, the vertical direction. The liquid delivery channel 23 can extend along the vertical direction, or can extend obliquely from the bottom of the box body 20 to the top of the box body 20. As long as the liquid delivery channel 23 can realize the upward delivery of the liquid. The channel inlet 231 can be located at the bottom of the liquid delivery channel 23, and the channel outlet 232 can be located at the top of the liquid delivery channel 23. The seal 31 is configured as a strip adapted to the box body 20, is arranged along the vertical direction, and is detachably engaged with the surrounding wall 202.

[0054] Refer toFigure 3 and Figure 4 , the mixing device 100 further includes a Venturi structure 40, and the channel outlet 232 is connected to the Venturi structure 40. The Venturi structure 40 is disposed on one side of the box body 20, and this side can be the upper side of the box body 20, the front and rear sides of the box body 20, or the left and right sides of the box body 20. Among them, the Venturi structure 40 includes a mixing chamber 41 and a steam channel 42 communicating with the mixing chamber 41, and the channel outlet 232 communicates with the mixing chamber 41. The steam channel 42 is used to communicate with a steam source, and the steam generated by the steam source can enter the mixing chamber 41 from the steam channel 42, so as to form a negative pressure in the mixing chamber 41. Under the action of the negative pressure, the liquid in the box body 20 is sucked into the mixing chamber 41 through the liquid delivery channel 23. The Venturi structure 40 further includes a liquid inlet channel 43 communicating with the mixing chamber 41 and an outlet channel 44 for output. Among them, the liquid inlet channel 43 is communicated with the liquid storage chamber 21 through the liquid delivery channel 23, that is to say, the mixing chamber 41 is communicated with the liquid storage chamber 21 through the liquid inlet channel 43 and the liquid delivery channel 23, and the liquid in the liquid storage chamber 21 can enter the mixing chamber 41 through the liquid delivery channel 23 and the liquid inlet channel 43, and the mixed liquid is output through the outlet channel 44.

[0055] Refer to Figure 3 and Figure 5, the mixing device 100 further includes a gas channel 45. The gas channel 45 communicates with the mixing chamber 41. A check valve 51 is provided in the gas channel 45. The check valve 51 is opened based on the negative pressure formed in the mixing chamber 41 to allow air to enter the mixing chamber 41. Since the diameter of the air inlet hole of the mixing device 100 applying the Venturi effect is very small, the air inlet hole is easily blocked. In this embodiment, the check valve 51 is provided in the gas channel 45, and the check valve 51 is opened based on the negative pressure formed in the mixing chamber 41 to allow air to enter. By providing the check valve 51, it is possible to prevent the milk / milk foam from overflowing from the gas channel 45 and blocking the air inlet hole upstream of the check valve 51 without affecting the entry of air into the mixing chamber 41, thereby ensuring the effect and stability of making milk foam. The liquid delivery channel 23 includes a narrow channel portion 233. The narrow channel portion 233 is located between the channel inlet 231 and the channel outlet 232; the cross-sectional area of the liquid delivery channel 23 is the smallest at the narrow channel portion 233; the position where the gas channel 45 communicates with the liquid delivery channel 23 is located between the channel outlet 232 and the narrow channel portion 233. During the process of sucking milk along the liquid delivery channel 23 into the mixing chamber 41, when the milk passes through the narrow channel portion 233, the flow rate of the milk increases, and a negative pressure will also be formed near the narrowing of the cross-section of the liquid delivery channel 23, that is, a negative pressure will also be formed near the narrow channel portion 233. The double negative pressure ensures the smooth opening of the check valve 51 and the smooth entry of air. When starting to make milk foam, the milk passing through the narrow channel portion 233 will form a negative pressure, which causes the check valve 51 to open, and the air enters and mixes with the milk, and then enters the interior of the mixing chamber 41 of the Venturi structure 40 at the same time. This can make the milk and air enter the mixing chamber 41 at a fixed ratio at the same time, making the effect of the made milk foam better, and at the same time increasing the temperature rise of the milk foam. The milk foam effect can reach the third-level milk foam standard, and the temperature rise of the milk foam can reach above 55°C.

[0056] To better guide the liquid, the liquid delivery channel 23 further includes a guiding portion 234. The guiding portion 234 is provided at at least one end of the narrow channel portion 233 along the liquid flow direction, and the slope of the guiding portion 234 is less than 1:1. Refer to Figure 1 As shown, the slope of the guiding portion 234 is defined as the ratio of the rising height H of the guiding portion 234 to the length L. The length L refers to the distance passed by the guiding portion 234 along the extending direction of the liquid delivery channel 23. Among them, the guiding portion 234 can be a transition surface composed of an inclined surface or an arc surface. Setting the slope of the guiding portion 234 to be less than 1:1 can improve the guiding property of the liquid, thereby ensuring the effect of generating negative pressure.

[0057] The guide portion 234 can be arranged only on the side of the narrow channel portion 233 close to the channel inlet 231, or only on the side close to the channel outlet 232, both of which can enhance the effect of negative pressure generation. Of course, the guide portion 234 can also be arranged on both sides of the narrow channel portion 233 along the liquid flow direction. If the guide portion 234 is arranged on both sides of the narrow channel portion 233, the negative pressure generation effect is best.

[0058] In some embodiments, the liquid delivery channel 23 includes a wide channel portion 235 from the channel inlet 231 to the narrow channel portion 233, and the ratio of the cross-sectional area A1 of the narrow channel portion 233 to the cross-sectional area A2 of the wide channel portion 235 is between 1:3 and 1:7. The cross-sectional area of ​​the narrow channel portion 233 is reduced relative to the cross-sectional area of ​​the wide channel portion 235 to ensure that a negative pressure sufficient to open the one-way valve 51 is generated. If the cross-sectional area of ​​the narrow channel portion 233 is large, the one-way valve 51 may not be opened, and air may not be able to smoothly enter the mixing chamber 41.

[0059] Further, the mixing device 100 further includes a support seat 30 on which the venturi structure 40 is disposed, a seal 31 is disposed on the support seat 30, a gas channel 45 includes an inlet main channel 452, the inlet main channel 452 is disposed on the support seat 30, and a one-way valve 51 is disposed in the inlet main channel 452. The one-way valve 51 is disposed in the inlet main channel 452 on the support seat 30, which facilitates the installation of the one-way valve 51 and does not affect the installation and removal between the seal 31 and the box body 20.

[0060] Reference Figure 5 The support seat 30 includes a contraction portion 341 forming a mixing chamber 41, and the main air intake channel 452 is arranged in the clearance space of the contraction portion 341. The main air intake channel 452 can make full use of the clearance space of the contraction portion 341, so that the structure of the support seat 30 can be more compact. Among them, the support seat 30 includes a main body 34 forming a venturi structure 40, the mixing chamber 41 is arranged in the main body 34, and the main air intake channel 452 can be arranged in the clearance space of the contraction portion 341 on the main body 34.

[0061] In this embodiment, the main air inlet channel 452 is arranged in the main body 34 along the horizontal direction. The main body 34 is easy to manufacture, and the entrance of the main air inlet channel 452 will not be blocked or blocked due to the falling of foreign objects. The horizontal position of the center line X1 of the main air inlet channel 452 is higher than the horizontal position of the center line X2 of the steam channel, which can further prevent milk / milk foam from overflowing from the gas channel 45 and contaminating the one-way valve 51. In addition, the venturi structure 40 protrudes to the side away from the box body 20, and the support seat 30 is provided with a wall 35 surrounding the venturi structure 40. The mixing device 100 also includes an end cover 36, and the end cover 36 is covered on the wall 35. In this way, the side of the venturi structure 40 facing away from the box body 20 is blocked by the end cover 36. The one-way valve 51 is arranged in the space blocked by the end cover 36. The end cover 36 is arranged to cover the wall 35, and the venturi structure 40 and the one-way valve 51 can be closed together with the wall 35, thereby improving the appearance of the mixing device 100. Furthermore, the hidden danger caused by the one-way valve 51 being exposed can be avoided.

[0062] Reference Figures 6 to 8 The main inlet passage 452 includes a connecting passage portion 455 and a mounting passage portion 456 that are connected, and the one-way valve 51 is disposed in the mounting passage portion 456; along the direction in which the gas flows from the one-way valve 51 into the mixing chamber 41, the connecting passage portion 455 is disposed downstream of the mounting passage portion 456. Along the direction in which the gas flows into the mixing chamber 41, the connecting passage portion 455 is disposed between the mounting passage portion 456 and the mixing chamber 41, and a descending step portion 457 is formed between the mounting passage portion 456 and the connecting passage portion 455. The connecting channel portion 455 is arranged below the one-way valve 51, that is, the connecting channel portion 455 is arranged at a lower position relative to the one-way valve 51, and a step portion 457 is arranged in the main air intake channel 452, which can further prevent milk from entering the installation channel portion 456, and also facilitate the milk / water in the installation channel portion 456 (if the one-way valve 51 is not dried when disassembled and cleaned) to flow back into the liquid holding chamber 21 through the step portion 457, the connecting channel portion 455, the air intake secondary channel 451 and the liquid delivery channel 23, thereby preventing the one-way valve 51 from being damaged.

[0063] The air inlet is arranged upstream of the one-way valve 51. The opening size of the air inlet has a great influence on the milk froth effect. If the opening of the air inlet is large, less milk will be supplied, the milk temperature will rise, and milk froth may splash. If the opening of the air inlet is small, more milk will be supplied, the milk temperature rise will be low, and the resulting drink will be similar to hot milk. Moreover, if the opening of the air inlet is too small, it will be easier to get clogged. Therefore, the opening size accuracy of the air inlet is unstable, resulting in the milk froth effect and the milk froth temperature rise being not stable enough.

[0064] In some embodiments, the mixing device 100 includes a sealing piece 52 disposed in the main air inlet passage 452. Along the gas inflow direction, the sealing piece 52 is disposed upstream of the one-way valve 51. The one-way valve 51 includes a support portion 511 at the upstream end and a valve nozzle portion 512 at the downstream end. An inlet of the one-way valve 51 is formed on the support portion 511, and the inlet is covered by the sealing piece 52. The sealing piece 52 has an air inlet hole 521, and the one-way valve 51 communicates with the external air through the air inlet hole 521. Preferably, the air inlet hole 521 is formed at the center of the sealing piece 52. The sealing piece 52 can define that air can only enter the one-way valve 51 from the air inlet hole 521. By providing an independent sealing piece 52 to form the air inlet hole 521, it is convenient for processing, and the size of the air inlet hole 521 can be accurately processed, so as to accurately control the air intake volume and ensure the required milk foam quality. Among them, the one-way valve 51 is configured as a duckbill valve, which has low cost and reliable use. The sealing piece 52 can be a metal sheet, and the air inlet hole 521 for air intake is provided on the metal sheet, and the accuracy of the size can be guaranteed.

[0065] A sealing plug is installed at the inlet end of the main air inlet passage 452, and the sealing piece 52 and the one-way valve 51 are fixed in the main air inlet passage 452 by the sealing plug. The sealing plug includes a detachable connection outer shell 53 and an inner plug 54. The outer shell 53 is inserted into the main air inlet passage 452 and is limited by the end of the main air inlet passage 452. The inner plug 54 is hollowly arranged, and an installation space is formed inside it. A step is provided inside the inner plug 54, and the support portion 511 abuts against the step. The valve nozzle portion 512 extends from the inner plug 54 towards the air passage port 453. The outer shell 53 is inserted into the installation space and fixes the support portion 511 of the sealing piece 52 and the one-way valve 51 between the step of the inner plug 54 and the outer shell 53. Installing the sealing piece 52 and the one-way valve 51 between the outer shell 53 and the inner plug 54 facilitates the tight fitting of the sealing piece 52 and the one-way valve 51, thereby effectively avoiding air leakage. In addition, it is also convenient for the installation and disassembly of the one-way valve 51, and at the same time ensures that the airtightness and fixation of the one-way valve 51 are more reliable when the mixing device 100 is in use. Preferably, the outer shell 53 and the inner plug 54 are connected by an interference fit, and the outer shell 53 is provided with an air inlet through hole for facilitating communication with the external air.

[0066] When the mixing device 100 is in use, steam rapidly jets out from the steam nozzle hole 421 of the steam channel 42, the pressure near the steam nozzle hole 421 becomes smaller, the air pressure on the milk liquid surface in the liquid containing cavity 21 is large, and the milk is sucked into the mixing cavity 41 along the liquid delivery channel 23; at the same time, air first enters the liquid delivery channel 23 through the one-way valve 51 to be pre-mixed with the milk, and the mixture of milk and air enters the mixing cavity 41. In the mixing cavity 41, milk, steam, and air are mixed. When stopping making milk foam, since the air inlet hole 521 on the sealing piece 52 is located upstream of the one-way valve 51, and at this time the one-way valve 51 has been closed, the metal sealing piece 52 will not be contaminated by the milk, and the air inlet hole 521 for air intake is effectively protected and will not block the air inlet hole 521, thus ensuring the effect and stability of subsequent milk foam making.

[0067] Continue to refer to Figures 3 to 4 , the gas channel 45 communicates with the mixing cavity 41 through the channel outlet 232. The gas channel 45 includes an air passage port 453 located on the sealing member, and the horizontal height of the air passage port 453 is higher than or equal to the horizontal height of the channel outlet 232. The gas channel 45 communicates with the liquid delivery channel 23, and there is no need to separately set a channel communicating with the mixing cavity 41 for air intake, which can simplify the Venturi structure 40. When making milk foam, air and milk can be pre-mixed before entering the mixing cavity 41, and the mixture of air and milk enters the mixing cavity 41 together through the channel outlet 232.

[0068] When stopping making milk foam, since the air passage port 453 is not lower than above the channel outlet 232, and the channel outlet 232 is the inlet of the liquid inlet channel 43, the liquid inlet channel 43 directly communicates with the mixing cavity 41, and there is no negative pressure in the channel. Under the action of gravity, the excess milk will fall into the liquid containing cavity 21 from the liquid delivery channel 23 and the air passage port 453. At this time, the one-way valve 51 has been closed, and the air inlet upstream of the one-way valve 51 is effectively protected and will not be blocked.

[0069] In particular, the horizontal height of the air passage port 453 is higher than the horizontal height of the channel outlet 232, and it is more difficult for the milk to flow counter-gravitationally through the air passage port 453 at a higher position to the one-way valve 51, which can further protect the one-way valve 51 from being easily contaminated. Even if it enters, the excess milk will more easily fall into the liquid containing cavity 21 from the liquid delivery channel 23 and the air passage port 453.

[0070] Continue to refer to Figure 1 and Figure 3, the gas passage 45 further includes an intake secondary passage 451. The intake secondary passage 451 is disposed between the box body 20 and the seal 31. It can be understood that the intake secondary passage 451 is formed by the cooperation between the box body 20 and the seal 31. The intake secondary passage 451 extends from the air passage port 453 to the passage outlet 232, facilitating a more compact arrangement of the intake secondary passage 451 and the liquid delivery passage 23. In this embodiment, the intake secondary passage 451 communicates with the intake main passage 452 through the air passage port 453 to ensure the reliability of the intake structure.

[0071] The intake secondary passage 451 extends downward and bends from the air passage port 453 to a preset position to communicate with the liquid delivery passage 23. The horizontal height of the preset position is lower than the horizontal height of the passage outlet 232. The intake secondary passage 451 communicating with the liquid delivery passage 23 at the preset position can ensure that the liquid and gas are fully pre-mixed before entering the mixing chamber 41 together from the passage outlet 232, ensuring a better mixing effect.

[0072] The outer wall of the box body 20 is provided with a first rib 251 and a second rib 252. The outer wall of the box body 20 is the outer side of the surrounding wall 202. The first rib 251 is used to define the liquid delivery passage 23, and the second rib 252 is used to define the intake secondary passage 451 of the gas passage 45. The first rib 251 abuts against the seal 31 to form the liquid delivery passage 23, and the second rib 252 abuts against the seal 31 to form the intake secondary passage 451 of the gas passage 45. The outer wall of the box body 20 forms an open passage, which is more convenient for cleaning and the connection with the seal 31 is also easy to operate. Among them, the passage inlet 231 and the passage outlet 232 are surrounded by the first rib 251, and the air passage port 453 is surrounded by the second rib 252. The first rib 251 and the second rib 252 form a closed figure on the surrounding wall 202 to ensure the sealing performance of the liquid delivery passage 23 and the intake secondary passage 451. In addition, the depth of the liquid delivery passage 23 is greater than the depth of the intake secondary passage 451, ensuring that the area of the communication port between the intake secondary passage 451 and the liquid delivery passage 23 is more suitable for the introduction of air and it is more difficult for the liquid to enter the intake secondary passage 451, and it can also meet the mixing ratio of the liquid and air.

[0073] Further, the passage inlet 231 communicates with the liquid receiving cavity 21, and a recess 26 is provided at the bottom of the liquid receiving cavity 21. The position of the recess 26 corresponds to that of the passage inlet 231. By providing the recess 26, the passage inlet 231 of the liquid delivery passage 23 corresponds to the recess 26. The lowermost end of the recess 26 is lower than the lowest liquid level in the box body 20. When the milk in the box body 20 is used up to the lowest liquid level, milk foam can still be made continuously, and finally there is less residual milk left in the recess 26, thereby improving the utilization rate of milk and reducing waste.

[0074] It can be understood that the channel inlet 231 is flush with the bottom of the recess 26, which can achieve substantially no residual milk.

[0075] Referring Figures 9 to 13 As shown, in another embodiment, the mixing device 200 includes a box body 20 and a seal 31. The box body 20 defines a liquid containing cavity 21, and the box bottom 201 and the surrounding wall 202 form the liquid containing cavity 21. The seal 31 is detachably disposed on the outer wall of the box body, that is, the outer side of the surrounding wall 202. The seal and the box body cooperate to form a liquid delivery channel 23. The liquid delivery channel 23 is disposed outside the liquid containing cavity 21, and there is no need to provide a separate liquid delivery pipe in the box body 20, thus forming a design without a milk pipe. The liquid delivery channel 23 includes a channel inlet 231 and a channel outlet 232 which are oppositely arranged. The channel inlet 231 communicates with the liquid containing cavity 21, and the liquid in the liquid containing cavity 21 can enter the liquid delivery channel 23 through the channel inlet 231. Among them, the channel inlet 231 is located at the bottom of the liquid delivery channel 23, and the channel outlet 232 is located at the top of the liquid delivery channel 23, and the liquid can be conveyed upward from the bottom of the liquid delivery channel 23 into the mixing cavity 41.

[0076] The mixing device 100 further includes a Venturi structure 40, and the channel outlet 232 is connected to the Venturi structure. Among them, the Venturi structure 40 includes a mixing cavity 41 and a steam channel 42 communicating with the mixing cavity 41, and the channel outlet 232 communicates with the mixing cavity. The mixing device further includes a gas channel 45a. The gas channel 45 communicates with the mixing cavity 41. A one-way valve 51 is provided in the gas channel 45a. The one-way valve 51 is opened based on the negative pressure formed in the mixing cavity 41 to allow air to enter the mixing cavity 41. By providing the one-way valve 51, it is possible to prevent the milk / milk foam from overflowing from the gas channel 45a and blocking the air inlet hole upstream of the one-way valve 51 without affecting the entry of air into the mixing cavity 41, thereby making the production of milk foam more reliable.

[0077] In this embodiment, components or parts with the same reference numerals have the same structure and effects as those in the foregoing embodiment, and will not be described herein again. Different from the above embodiment, the main air inlet passage 452a of the gas passage 45a includes a connected connection passage portion 455a and an installation passage portion 456a. Along the direction of gas flowing into the mixing chamber 41, the connection passage portion 455a is disposed downstream of the installation passage portion 456a. The connection passage portion 455a is disposed between the installation passage portion 456a and the mixing chamber 41. The one-way valve 51 is disposed in the installation passage portion 456a, and the installation passage portion 456a is provided with a support seat 30 in the vertical direction. By arranging the installation passage portion 456a in the vertical direction and the connection passage portion 455a being disposed at a lower position relative to the one-way valve 51, it is also possible to prevent milk from entering the installation passage portion 456a. At the same time, it is convenient for the milk / water in the installation passage portion 456a (such as when the one-way valve 51 is disassembled and cleaned without being dried) to flow back into the liquid storage chamber 21 through the connection passage portion 455a, the secondary air inlet passage 451a, and the liquid delivery passage 23, preventing damage to the one-way valve 51.

[0078] Specifically, the horizontal height of the air through-port 453a is substantially equal to the horizontal height of the passage outlet 232. When the installation passage portion 456a is arranged in the vertical direction, even if the milk in the liquid delivery passage 23 enters the air through-port 453a, the excess milk will more easily fall from the air through-port 453a through the liquid delivery passage 23 into the liquid storage chamber 21 under the action of gravity.

[0079] The one-way valve 51 is fixed in the installation passage portion 456a by a sealing plug. The specific structures of the one-way valve 51 and the sealing plug are the same as those in the above embodiment. The difference is that both ends of the housing 53a protrude downward and are stuck on the front and rear edges of the support seat 30, facilitating the disassembly of the mixing device 200.

[0080] Refer to Figure 14 , in some embodiments, the secondary air inlet passage 451b extends linearly from the air through-port 453 to communicate with the liquid delivery passage 23. Arranging the secondary air inlet passage 451b to extend linearly facilitates the manufacture of the cartridge 20. Specifically, the second rib 252b includes a first annular portion 257, the second rib 252 includes a second annular portion 258 and a narrow passage portion 259. The first annular portion 257 surrounds the air through-port 453, the second annular portion 258 surrounds the passage outlet 232, and the first annular portion 257 and the second annular portion 258 are hermetically connected through the narrow passage portion 259. Spacing the first annular portion 257 and the second annular portion 258 through the narrow passage portion 259 more reliably seals the peripheries of the passage outlet 232 and the air through-port 253.

[0081] Refer to Figure 15, in some embodiments, the intake sub-channel 451c extends linearly from the air passage port 453 to communicate with the liquid delivery channel 23. The linear extension of the intake sub-channel 451c facilitates the manufacture of the cartridge 20. Among them, the second rib 252c is configured in a runway shape. Along the extension direction of the intake sub-channel 451c and along the extension direction of the liquid delivery channel 23, the first rib 251c and the second rib 252c intersect to form a closed connection, and both the air passage port 453 and the channel outlet 232 are located within the range defined by the second rib 252c, thereby simplifying the manufacture of the cartridge.

[0082] Referring to Figure 16 , in some embodiments, the intake sub-channel 451 extends downward and bends from the air passage port 453 to a preset position to communicate with the liquid delivery channel 23, and the horizontal height of the preset position is lower than the horizontal height of the channel outlet 232. The intake sub-channel 451 communicates with the liquid delivery channel 23 at the preset position, which can ensure that the liquid and gas are premixed and then enter the mixing chamber 41 together from the channel outlet 232, ensuring better mixing effect. Among them, the liquid delivery channel 23 includes a platform portion 239 provided inside the first rib 251. The platform portion 239 is arranged around the channel outlet 232, that is, the platform portion 239 can be considered as a partial runway-shaped surface formed around the center of the channel outlet 232. By providing the platform portion 239, the part of the first rib 251 corresponding to the channel outlet 232 can increase the space for premixing of gas and liquid and improve the mixing effect. In addition, the liquid delivery channel 23 further includes a guiding portion 235a. The guiding portion 235a is provided at at least one end of the narrow channel portion 233 along the liquid flow direction, and the slope of the guiding portion 235a is greater than 1:1. Providing the guiding portion 235a can also create a negative pressure near the narrowing of the cross-section of the liquid delivery channel 23, and the double negative pressure ensures that the one-way valve 51 opens smoothly and air enters smoothly.

[0083] Referring to Figure 17 , in some embodiments, the intake sub-channel 451 extends downward and bends from the air passage port 453 to a preset position to communicate with the liquid delivery channel 23, and the horizontal height of the preset position is lower than the horizontal height of the channel outlet 232. Different from the above embodiment, the liquid delivery channel 23 does not have a narrowed cross-section part, and the gas and liquid are introduced into the mixing chamber through the channel outlet 232 based on the negative pressure in the mixing chamber 41.

[0084] Referring to Figure 16, the present utility model also provides a coffee machine 10, which includes the mixing device in the above embodiment. The coffee machine 10 includes a front panel 11 connected to the outlet assembly. The mixing device 100 is detachably connected to the front panel 11 and is located on one side of the outlet assembly 12. Among them, an installation groove 13 is provided on the front panel 11. The mixing device 100 can connect the steam joint into the installation groove 13 to realize the connection between the steam channel 42 and the steam output pipeline inside the coffee machine 10.

[0085] The above mixing device is not limited to being applied in a coffee machine, and can also be used in other beverage brewing devices, such as a tea machine or other devices for brewing beverages.

[0086] In the above embodiment, the liquid delivery channel formed by the engagement of the seal and the box body solves the problem that the traditional milk pipe is not easy to clean. And by providing a one-way valve 51 in the gas channel 45, the one-way valve 51 automatically opens based on the negative pressure formed in the mixing chamber 41 to allow external air to enter, which can prevent milk / milk foam from overflowing from the gas channel 45 and blocking the air inlet hole upstream of the one-way valve 51 without affecting the entry of air into the mixing chamber 41, so that making milk foam is more reliable.

[0087] It should be understood that although this specification is described according to embodiments, not every embodiment only contains 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.

[0088] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not used to limit the protection scope of the present utility model. Any equivalent embodiments or changes made without departing from the technical spirit of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A mixing device comprising: A box body defines a liquid containing cavity; A sealing member is disposed on the outer wall of the box body, wherein the sealing member cooperates with the box body to form a liquid delivery channel, wherein the liquid delivery channel includes a channel inlet and a channel outlet, and the channel inlet communicates with the liquid containing cavity; A venturi structure connected to the channel outlet, the venturi structure comprising a mixing chamber and a steam channel connected to the mixing chamber, and the channel outlet is connected to the mixing chamber; It is characterized in that the mixing device also includes a gas channel, which is connected to the mixing chamber. A one-way valve is provided in the gas channel, and the one-way valve opens based on the negative pressure formed in the mixing chamber to allow air to enter the mixing chamber.

2. The mixing device according to claim 1, characterized in that The liquid delivery channel comprises a narrow channel portion, which is located between the channel inlet and the channel outlet; the cross-sectional area of ​​the liquid delivery channel is the smallest in the narrow channel portion; and the position where the gas channel communicates with the liquid delivery channel is located between the channel outlet and the narrow channel portion.

3. The mixing device according to claim 2, characterized in that The liquid delivery channel also includes a guide portion, which is arranged at at least one end of the narrow channel portion along the liquid flow direction, and the slope of the guide portion is less than 1:

1.

4. The mixing device according to claim 2, characterized in that The liquid delivery channel includes a wide channel portion from the channel inlet to the narrow channel portion, and a ratio of a cross-sectional area of ​​the narrow channel portion to a cross-sectional area of ​​the wide channel portion is between 1:3 and 1:

7.

5. The mixing device according to any one of claims 1 to 4, characterized in that The mixing device further comprises a support seat for setting the Venturi structure, the support seat is detachably connected to the box body, and the sealing member is arranged on the support seat; The gas channel comprises a main air intake channel, the main air intake channel is arranged on the support seat, and the one-way valve is arranged in the main air intake channel.

6. The mixing device according to claim 5, characterized in that The support seat comprises a contraction portion forming the mixing chamber, and the main air intake channel is arranged in a clearance space of the contraction portion.

7. The mixing device according to claim 5, characterized in that The main air intake channel is arranged on the support seat along the horizontal direction, and the horizontal position of the center line of the main air intake channel is higher than the horizontal position of the center line of the steam channel.

8. The mixing device according to claim 7, characterized in that The main air intake channel comprises a connecting channel portion and an installation channel portion which are in communication with each other, and the one-way valve is arranged in the installation channel portion; Along the direction in which the gas flows into the mixing chamber, the connecting channel portion is arranged between the mounting channel portion and the mixing chamber, and a descending step portion is formed between the mounting channel portion and the connecting channel portion.

9. The mixing device according to claim 5, characterized in that The main air intake channel includes a connecting channel portion and an installation channel portion that are connected. Along the direction in which the gas flows into the mixing chamber, the connecting channel portion is arranged downstream of the installation channel portion, and the connecting channel portion is arranged between the installation channel portion and the mixing chamber. The one-way valve is arranged in the installation channel portion, and the installation channel portion is arranged on the support seat along the vertical direction.

10. The mixing device according to claim 5, characterized in that The mixing device further comprises a sealing sheet arranged in the main air inlet passage, and the sealing sheet is arranged upstream of the one-way valve along the direction in which the gas flows into the mixing chamber; the sealing sheet has an air inlet hole, and the one-way valve is connected to the external air through the air inlet hole; A sealing plug is installed at the inlet end of the main air intake passage, and the sealing sheet and the one-way valve are fixed in the main air intake passage through the sealing plug.

11. The mixing device according to any one of claims 1 to 4, characterized in that The gas channel is connected to the mixing chamber through the channel outlet, and the gas channel includes an air through port located on the sealing member, and the level of the air through port is higher than or equal to the level of the channel outlet.

12. The mixing device according to claim 11, characterized in that The mixing device further comprises a support seat for setting the Venturi structure, the support seat is detachably connected to the box body, and the sealing member is arranged on the support seat; The gas channel includes a main intake channel and a secondary intake channel. The main intake channel is arranged on the support seat. The sealing member cooperates with the box body to form the secondary intake channel. The secondary intake channel is connected to the main intake channel through the air through-port.

13. The mixing device according to claim 11, characterized in that The gas channel includes an air intake sub-channel, and the sealing member cooperates with the box body to form the air intake sub-channel, and the air intake sub-channel extends from the air through-port to the channel outlet.

14. The mixing device according to claim 12, characterized in that The air intake secondary channel bends downward from the air passage and extends to a preset position to communicate with the liquid delivery channel, and the level of the preset position is lower than the level of the channel outlet.

15. The mixing device according to claim 12, characterized in that The outer wall of the box body is provided with a first convex rib and a second convex rib, the first convex rib abuts against the sealing member to form the liquid delivery channel, the second convex rib abuts against the sealing member to form the air intake secondary channel, the channel inlet and the channel outlet are surrounded by the first convex rib, the air passage is surrounded by the second convex rib, and the first convex rib and the second convex rib form a closed pattern on the outer wall of the box body.

16. The mixing device according to any one of claims 1 to 4, characterized in that A recessed portion is provided at the bottom of the liquid containing chamber, and the recessed portion corresponds to the position of the channel entrance.

17. A coffee machine, characterized in that: The coffee machine comprises a mixing device as claimed in any one of claims 1 to 16, wherein the coffee machine comprises a front panel connected to an outlet assembly, and the mixing device is detachably connected to the front panel and is located at one side of the outlet assembly.

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