Milk frothing device and coffee machine having same

Abstract

The utility model relates to milk foaming equipment and a coffee machine with the milk foaming equipment, and aims to solve the technical problems that capsules of existing similar rubber products are easy to be uneven after being placed in a cavity, so that the falling smoothness of waste capsules is not smooth, and the capsules are easy to be blocked and the cavity is blocked. An adjusting mechanism in a milk box of the milk foaming equipment comprises a steam input channel, an air suction channel, a gas-liquid suction channel and a milk foam output channel which are communicated with one another; the adjusting mechanism is characterized in that a main body of the adjusting mechanism is a four-way valve body, the valve body is fixedly arranged in the milk box, a gas-liquid suction channel of the valve body and the circular end face of the top of the suction pipe connector are provided with a static hole and a moving hole respectively, and the moving hole and the static hole move relatively. The change of the minimum through-flow area between the gas-liquid suction channel and the air suction channel in the axis direction is adjusted; the milk froth has at least two drift diameter specifications, the drift diameter specifications correspond to two different milk froth temperatures respectively, and the different milk froth temperatures specifically include hot milk and cold milk.

Description

Technical Field

[0001] The utility model relates to a milk foaming device of a coffee machine, which is a milk foaming device and a coffee machine with the device. Background Art

[0002] A coffee machine is an electrical device for coffee making, generally divided into semi-automatic and fully automatic types. Among them, the semi-automatic coffee machine is a traditional Italian coffee machine, which grinds, presses, loads, brews, and manually removes residues according to manual operations. Some coffee machines require a milk foaming device to improve the taste of the drink. There are generally three ways to achieve milk foam in existing coffee machines: steam wand, straw, and milk box. The implementation principles of the above three methods are basically the same, that is, based on the Venturi effect, high-speed steam is used to inhale air or milk to form milk foam. Among them, the milk box solution has been more popular in recent years. With the progress of technology, a solution for providing cold milk foam has emerged. The cold milk foam refers to the inhaled milk temperature of about 4°C, and the output milk foam temperature is lower than 30°C (lower than body temperature, with a low temperature feeling). To solve the above solutions in the prior art, manufacturers often need to configure two types of milk boxes, cold and hot, to provide hot milk foam and cold milk foam respectively. During user use, the user needs to replace the milk box set matched with the main machine by himself; such a solution is more cumbersome for users and has a higher overall machine cost for manufacturers, so it is not the best solution. The milk box or milk foam device of existing coffee machines, such as the application number 202310673296.2 disclosed in Chinese patent literature, the application publication date is October 3, 2023, and the invention name is "Milk Foam Device and Its Milk Foam Intake Assembly and Button Locking Assembly"; another example is the application number 202311101956.6 disclosed in Chinese patent literature, the application publication date is November 7, 2023, and the invention name is "A Steam Valve Assembly and a Coffee Machine with the Same"; and the application number 202311189998.X disclosed in Chinese patent literature, the application publication date is December 22, 2023, and the invention name is "A Coffee Machine Milk Foaming Device and Its Air Conditioning Mechanism"; the structural designs of the above products and similar products are not good, resulting in inconvenient production and assembly and higher production costs. In particular, the channel structure design of the four-way in the valve body is not good, which is not suitable for cold and hot milk foaming and extraction use, and the interlocking and unlocking structure design of the overall loading and unloading of the milk box is not good; at the same time, some existing similar products need to be combined with the hot water structure function for use, resulting in a more complex structural design. Summary of the Invention

[0003] To overcome the above deficiencies, the purpose of the utility model is to provide a milk foaming device and a coffee machine with the device to the art, so as to solve the technical problems that the valve body channel structure design of the milk foaming device in existing coffee machine products is not good, not suitable for cold and hot milk foaming and extraction use, and the interlocking and unlocking structure design of the overall loading and unloading of the milk box is not good. Its purpose is achieved through the following technical solutions.

[0004] A milk foaming device, which includes a milk box and a milk carton. The bottom of the milk carton is buckled with the box opening at the top of the milk box. An adjusting mechanism is provided in the milk carton. The adjusting mechanism includes a steam input channel, an air inhalation channel, a gas-liquid inhalation channel, and a milk foam output channel. The above four channels are interconnected. The straw of the adjusting mechanism in the milk carton extends into the milk box, and the straw is connected to the gas-liquid inhalation channel of the adjusting mechanism through a straw connector. A steam joint is provided on one side of the steam input channel of the adjusting mechanism. One side of the air inhalation channel of the adjusting mechanism is communicated with the air pressure small hole of the air inlet valve at the air inlet knob. The milk outlet pipe on one side of the milk foam output channel of the adjusting mechanism extends out of the milk carton. The key point of its structural design is that the main body of the adjusting mechanism is a four-way valve body, which is fixedly arranged in the milk carton. A stationary hole and a moving hole are respectively provided on the top circular end surface of the gas-liquid inhalation channel of the valve body and the straw connector. The moving hole makes relative movement with the stationary hole to adjust the change of the minimum flow area between the gas-liquid inhalation channel and the air inhalation channel along the axial direction. The specific shapes of the above moving hole and stationary hole are not limited to the following long strip-shaped orifice and special-shaped hole structures, as long as the two ends of the moving hole have different diameters, the diameter of the stationary hole is fixed, and rotating the straw connector at the moving hole or the straw connector at the stationary hole can change the minimum flow area.

[0005] The orifice at the gas-liquid inhalation channel of the valve body is a long strip-shaped stationary hole, and the moving hole at the top circular end surface of the straw connector at the gas-liquid inhalation channel of the valve body is a special-shaped hole. The special-shaped hole of the straw connector is eccentrically arranged on one side of the top circular end surface of the straw connector. The special-shaped hole is arc-shaped and increases from one end to the other end. A protruding adjusting ear is provided on one side of the straw connector extending out of the bottom of the valve body. The straw connector is integrally formed with the straw or the straw. Thus, the above structure can adjust the minimum diameter of the straw through the adjusting ear of the straw connector, that is, the diameter between the special-shaped hole of the straw connector and the gas-liquid inhalation channel of the valve body changes, and there are at least two diameter specifications. These two diameter specifications respectively correspond to two different milk foam temperatures, and the two different milk foam temperatures are specifically hot milk and cold milk. Meanwhile, the shape of the above-mentioned special-shaped hole can also be set in the gas-liquid suction channel of the valve body, and the long-strip-shaped orifice at the gas-liquid suction channel of the valve body can also be set in the special-shaped hole of the straw connector to achieve mutual replacement setting. Figure 1

[0006] One end of the steam joint on the side of the steam input channel of the valve body extends out of the milk carton. The intake valve on the side of the air intake channel of the adjustment mechanism is connected to the intake knob at the top of the milk carton. The air intake channel is aligned with the air pressure small hole of the intake valve. Inside the main channel at one end of the valve body, there is a steam joint with a conical boss at the end that is sleeved and limited and fixed inside the valve body through the end of the steam joint. On both sides of the boss of the steam joint, there are symmetrically arranged triangular notches. When the steam input channel of the central hole at the boss of the steam joint is aligned with the milk foam output channel in the main channel of the valve body, there is a channel gap at the orifice between the steam input channel of the steam joint and the milk foam output channel of the valve body. Above the steam input channel of the steam joint, there is an air intake channel in the main channel of the valve body. Below the steam input channel of the steam joint, there is a gas-liquid intake channel in the main channel of the valve body. At the connection points of the steam joint, the straw connector, and the milk outlet pipe with the valve body, there are respectively provided sealing rings or sealed connections. The above intake valve can also be arranged inside the milk carton according to the prior art and achieve quick connection through the inserted quick connector; the channel gap inside the above valve body is used for the regulation and buffering of the pressure inside the valve body.

[0007] The gas-liquid intake channel is arranged in a vertically offset and eccentric manner below the air intake channel in the main channel of the valve body with respect to the milk foam output channel. The above design of the offset and eccentric structure makes the milk foaming effect inside the valve body better and is not prone to blockage.

[0008] In the middle of the straw connector where it fits into the chamber below the gas-liquid intake channel of the valve body, there is a through horizontal hole. The special-shaped hole above and the straw hole below in the horizontal hole are arranged in a staggered manner. The horizontal hole of the straw connector sealed inside the gas-liquid intake channel of the valve body is used for regulating and buffering the pressure of the foamed milk.

[0009] Inside the milk carton, there is a swing rod lock button. The milk carton includes a milk carton upper cover and a milk carton lower cover. One end of the swing rod lock button is hinged and fixed to the pin column at the inner top of the milk carton lower cover. The buckle hook at the other end of the swing rod lock button extends out of the milk carton upper cover. On one side of the middle arc-shaped bulge of the swing rod lock button, there is a protruding pressing head. The pressing head of the swing rod lock button extends out of the button hole on one side of the milk carton upper cover. The milk cover is fixed to the hook groove on one side of the machine body through the buckle hook of the swing rod lock button. The middle arc-shaped bulge of the swing rod lock button is arranged on the outside of the valve body inside the milk carton. The swing rod lock button with the above structure facilitates unlocking the swing rod lock button through the button head extending out on one side, so as to remove the milk foaming device without affecting the use of other components inside the milk carton.

[0010] On the outer diameter of the milk carton upper cover at the buckle hook of the swing rod lock button, there is a protruding rectangular groove. The buckle hook of the swing rod lock button is aligned with the opening on one side of the rectangular groove of the milk carton upper cover. Thus, while facilitating the positioning and fixing of the milk carton to the machine body, it is further fixed through the buckle hook of the swing rod lock button.

[0011] The snap hook of the swing rod latch button and the rectangular groove of the upper lid of the milk carton are arranged on one side of the upper lid of the milk carton above the steam joint. The end of the steam joint protruding from the milk carton has an isosceles trapezoidal head. Thus, while the milk foaming device is connected to the steam interface at the steam pipe inside the machine body through the steam joint, the snap hook of the swing rod latch button and the rectangular groove of the upper lid of the carton are fixed to the corresponding hook groove and side groove on one side of the machine body.

[0012] The milk box and the milk carton are correspondingly rectangular. The steam joint is arranged on the short side of the milk carton, and the milk outlet pipe is arranged on the long side of the milk carton. The above is a specific embodiment of the shapes of the milk box and the milk carton, and the positions of the steam joint and the milk outlet pipe are set according to the specific shapes.

[0013] The steam joint protrudes from the lower lid of the milk carton inside the milk box and the semi-circular opening on one side corresponding to the top opening of the milk box. A circular ring is provided on one side of the bottom of the protruding part of the steam joint on the lower lid of the milk carton. While the steam joint extends into the main channel of the valve body through the circular ring of the lower lid of the milk carton, the locking post protruding from the outer diameter side of the steam joint is screwed into and fastened to the locking hole at the bottom of the spiral groove through the opening at the spiral groove on one side of the main channel of the valve body. The above is a specific structural embodiment of the steam joint fixed to the milk carton and the valve body, and its safety in use is improved through the double-limit locking structure.

[0014] The milk outlet pipe extends out of the U-shaped opening on one side of the top of the milk box in an L shape through the pipe hole in the groove on one side of the lower lid of the milk carton at the milk carton. The U-shaped opening on the lower lid of the milk carton corresponds to the upper U-shaped opening at the lid opening of the upper lid of the milk carton, and the inner U-shaped groove at the top inside the groove of the lower lid of the milk carton. The above is a specific structural embodiment, and other existing structural forms can also be adopted to meet the use of the milk outlet pipe and the assembly of the corresponding components.

[0015] The milk outlet pipe includes an L-shaped pipe seat and an obliquely upward pipe head at one end. Columns and grooves with symmetric convex ribs on both sides of the annular ring are respectively provided at the connection between the L-shaped pipe seat and the obliquely upward pipe head of the milk outlet pipe, as well as a special-shaped gasket with a corresponding shape. The above structure facilitates the assembly production, cleaning of the milk outlet pipe, and the adjustment of the use angle.

[0016] Symmetric positioning ribs are provided on both sides of the knob sleeve at the bottom of the intake knob. While the positioning ribs of the intake knob are inserted into the positioning grooves on both sides of the inner diameter at the knob hole on the top of the upper lid of the milk carton, the knob sleeve of the intake knob is inserted into the intake valve. A spiral intake groove is provided on the inner wall of the intake valve. A strip-shaped groove is provided on the outer diameter side of the knob sleeve at the bottom of the intake knob corresponding to the intake groove. Limit blocks larger than the knob hole on the top of the upper lid of the milk carton are provided on both sides of the top hole of the intake valve. The limit blocks of the intake valve are fastened to the block holes on both sides of the top hole of the valve body. The above is a specific design of the air pressure adjustment structure, and the valve body of the existing similar air pressure adjustment structure can also be adopted.

[0017] On both sides of the inner bottom annular groove above the knob sleeve of the intake knob, there are symmetrically arranged integrally formed limiting ribs. On the outside of the knob hole at the top of the upper lid of the milk carton corresponding to the bottom annular groove of the intake knob, there are protruding limiting posts. The annular groove of the intake knob is inserted into the limiting posts on the upper lid of the milk carton. The above structure facilitates the use and positioning of the intake knob.

[0018] According to the structural characteristics of the above milk foaming device, the specific structural features of the coffee machine with this device are as follows: The milk box and the milk carton are integrated and arranged on one side of the machine body. The steam joint extending out of the milk carton is inserted and fixed into the steam interface of the machine body. Thus, with this milk foaming device, the corresponding coffee machine can make foamed milk and, at the same time, adjust the diameter between the special-shaped hole of the straw connector and the gas-liquid suction channel of the valve body to meet the use of two different milk foam temperatures.

[0019] When the steam joint is inserted and fixed into the steam interface of the machine body, the buckle hook extending from one end of the swing rod lock button is buckled with the hook groove at the machine body. The protrusion at the milk carton at the buckle hook is inserted into the side groove at the hook groove of the machine body. One end of the swing rod lock button extending out of the buckle hook inside the milk carton is arranged on one side opening of the protrusion or rectangular groove above the steam joint. The other end of the swing rod lock button inside the milk carton is hinged and fixed inside the milk carton. The pressing head on one side in the middle of the swing rod lock button inside the milk carton extends out of the milk carton. Thus, by pressing the pressing head of the swing rod lock button, the buckle hook of the swing rod lock button is driven to disengage from the machine body, and then the milk foaming device can be taken out.

[0020] The milk foaming device with the structure of the present utility model is reasonably designed, convenient for overall disassembly, cleaning, with good foaming effect and safe to use. It is especially suitable for the extraction and foaming of hot milk and cold milk at two temperatures; it is suitable for use as a milk foaming device and a coffee machine with this device, as well as the structural improvement of similar products. Description of the Drawings

[0021] Figure 2 It is an exploded structural schematic diagram of an embodiment of the present utility model. The framed part in the figure is the enlarged structure on the other side of the steam joint and the enlarged structure of the straw connector.

[0022] Figure 1 It is Figure 1 the three-dimensional structure schematic Figure 1 , and the dotted lines in the figure are the internal structures of the milk box and the milk carton.

[0023] Figure 3 It is Figure 1 the three-dimensional structure schematic Figure 2 , and the dotted line in the figure is the upper lid of the milk carton of the milk carton, and the framed part is the opened structure of the milk outlet pipe.

[0024] Figure 4 It is Figure 1 the bottom structure schematic diagram of the valve body.

[0025] Figure 5 is Figure 1 The schematic top view structure diagram after assembly. The dotted lines in the figure are the internal partial sectional structures. Part A is framed, and sectional views A-A, B-B, and C-C are made.

[0026] Figure 6 is Figure 5 The enlarged view of Part A of

[0027] Figure 7 is Figure 6 The schematic structure diagram of the change in the through diameter between the special-shaped hole and the gas-liquid suction channel after the rotation of the straw connector of

[0028] Figure 8 is Figure 5 The schematic sectional view A-A of , where Part B is framed in the figure.

[0029] Figure 9 is Figure 8 The enlarged view of Part B of

[0030] Figure 10 is Figure 5 The schematic sectional view B-B of , where the framed part is the enlarged bottom structure diagram of the air intake knob.

[0031] Figure 11 is Figure 5 The schematic sectional view C-C of , where the framed part is the enlarged structure diagram of the air intake valve.

[0032] Figure 12 is the schematic diagram I of the working principle of another moving hole and stationary hole of the present utility model.

[0033] Figure 13 is the schematic diagram II of the working principle of another moving hole and stationary hole of the present utility model.

[0034] Reference numerals and names of the drawings: 1. Milk box, 2. Lower cover of milk carton, 201. Pin column, 3. Straw, 4. Straw connector, 401. Special-shaped hole, 402. Adjusting ear, 403. Horizontal hole, 5. Valve body, 501. Air suction channel, 502. Gas-liquid suction channel, 503. Milk foam output channel, 504. Channel gap, 6. Milk outlet pipe, 601. L-shaped pipe seat, 602. Oblique pipe head, 603. Special-shaped gasket, 7. Air intake valve, 701. Air pressure small hole, 702. Air intake groove, 703. Limit block, 8. Swing rod lock button, 801. Buckle hook, 802. Pressing head, 9. Upper cover of milk carton, 10. Air intake knob, 1001. Positioning rib, 1002. Strip-shaped groove, 1003. Limit rib, 11. Steam joint, 1101. Steam input channel, 1102. Notch, 1103. Lock column. Detailed implementation manners

[0035] With reference to the accompanying drawings, the structure and use of the present utility model will be further described. As Figures 1 - 11 shown, the milk foaming device includes a milk box 1 and a milk carton. The milk carton includes an upper milk carton cover 9 and a lower milk carton cover 2. The bottom of the milk carton is buckled with the box opening at the top of the milk box. An adjusting mechanism is provided inside the milk carton. The adjusting mechanism includes a steam input channel 1101, an air suction channel 501, a gas-liquid suction channel 502, and a milk foam output channel 503. The above four channels are interconnected. The straw 3 of the adjusting mechanism inside the milk carton extends into the milk box. The straw is connected to the gas-liquid suction channel of the adjusting mechanism through a straw connector 4. One end of the steam joint 11 on one side of the steam input channel of the adjusting mechanism extends out of the milk carton. The air inlet valve 7 on one side of the air suction channel of the adjusting mechanism is connected to the air inlet knob 10 at the top of the milk carton. The air suction channel is communicated with the air pressure small hole 701 of the air inlet valve. The milk outlet pipe 6 on one side of the milk foam output channel of the adjusting mechanism extends out of the milk carton. The main body of the above adjusting mechanism is a four-way valve body 5. The valve body is fixedly arranged inside the milk carton. A steam joint is arranged in the main channel at one end of the valve body. The end of the steam joint is sleeved and limited and fixed inside the valve body by a conical boss at the end of the steam joint passing through the steam joint. Triangular notches 1102 are symmetrically arranged on both sides of the boss of the steam joint. When the steam input channel of the central hole at the boss of the steam joint is aligned with the milk foam output channel in the main channel of the valve body, a channel gap 504 is provided at the orifice between the steam input channel of the steam joint and the milk foam output channel of the valve body. An air suction channel is provided in the main channel of the valve body above the steam input channel of the steam joint. A gas-liquid suction channel is provided in the main channel of the valve body below the steam input channel of the steam joint. Double-layer sealing rings are respectively provided at the joints of the steam joint, the straw connector, and the milk outlet pipe with the valve body. The gas-liquid suction channel is vertically and eccentrically arranged below the air suction channel in the main channel of the valve body and is offset from the milk foam output channel. At the same time, the orifice at the gas-liquid suction channel of the valve body is strip-shaped. An irregular hole 401 is provided on the circular end face at the top of the straw connector at the gas-liquid suction channel of the valve body. The irregular hole of the straw connector is eccentrically arranged on one side of the circular end face at the top of the straw connector. The irregular hole is arc-shaped and increases from one end to the other end. A raised adjusting ear 402 is provided on one side of the straw connector extending out of the bottom of the valve body. A through horizontal hole 403 is provided in the middle of the straw connector at the joint of the straw connector and the lower chamber of the gas-liquid suction channel of the valve body. The irregular hole above the horizontal hole and the straw hole below are arranged in a staggered manner.

[0036] A swing rod latch button 8 is provided inside the above-mentioned milk carton. One end of the swing rod latch button is hinged and fixed to a pin 201 on the inner top of the lower cover of the milk carton. The buckle hook 801 at the other end of the swing rod latch button extends out of the upper cover of the milk carton. A convex pressing head 802 is provided on one side of the middle arc-shaped bulge of the swing rod latch button. The pressing head of the swing rod latch button extends out of the button hole on one side of the upper cover of the milk carton. The milk cap is fixed to the hook groove on one side of the machine body through the buckle hook of the swing rod latch button. One side of the middle arc-shaped bulge of the swing rod latch button is arranged outside the valve body inside the milk carton. There is a convex rectangular groove on the outer diameter of the upper cover of the milk carton at the buckle hook of the swing rod latch button. The buckle hook of the swing rod latch button is aligned with the opening on one side of the rectangular groove of the upper cover of the milk carton. The buckle hook of the swing rod latch button and the rectangular groove of the upper cover of the milk carton are arranged on one side of the upper cover of the milk carton above the steam joint. The end of the steam joint extending out of the milk carton is in the shape of an isosceles trapezoid head.

[0037] The above-mentioned milk box and milk carton are correspondingly rectangular. The steam joint is arranged on one short side of the milk carton, and the milk outlet pipe is arranged on one long side of the milk carton. The steam joint extends out of the lower cover of the milk carton inside the milk box and the semi-circular opening on one side of the top box opening of the corresponding milk box. There is a circular ring on the bottom side of the extension of the steam joint of the lower cover of the milk carton. The steam joint extends into the main channel of the valve body through the circular ring of the lower cover of the milk carton. At the same time, the locking post 1103 protruding from one side of the outer diameter of the steam joint is screwed into and fastened to the locking hole at the bottom of the spiral groove through the opening of the spiral groove at the side hole of the main channel of the valve body. The milk outlet pipe extends out of the U-shaped opening on one side of the top box opening of the milk box in an L shape through the pipe hole in the groove on one side of the lower cover of the milk carton at the milk carton. The U-shaped opening of the lower cover of the milk carton corresponds to the upper U-shaped opening at the cover opening of the upper cover of the milk carton and the inner U-shaped groove at the top of the groove inside the lower cover of the milk carton. The milk outlet pipe includes an L-shaped pipe seat 601 and an inclined pipe head 602 with one end upturned. Column parts and grooves with symmetric convex ribs on both sides of the annular ring are respectively provided at the connection between the L-shaped pipe seat and the inclined pipe head of the milk outlet pipe, and a special-shaped gasket 603 with a corresponding shape.

[0038] Symmetric positioning ribs 1001 are provided on both sides of the knob sleeve at the bottom of the above-mentioned air intake knob. The positioning ribs of the air intake knob are inserted into the positioning grooves on both sides of the inner diameter at the knob holes on the top of the upper cover of the milk carton. At the same time, the knob sleeve of the air intake knob is inserted into the air intake valve 7. The inner wall of the air intake valve is provided with a spiral air intake groove 702. A strip-shaped groove 1002 is provided on one side of the outer diameter of the knob sleeve at the bottom of the air intake knob corresponding to the air intake groove. Limiting blocks 703 larger than the knob holes on the top of the upper cover of the milk carton are provided on both sides of the top hole of the air intake valve. The limiting blocks of the air intake valve are fastened to the block holes on both sides of the top hole of the valve body. Symmetrically integrated limiting ribs 1003 are provided on both sides of the bottom annular groove above the knob sleeve of the air intake knob. A protruding limiting post is provided outside the knob hole on the top of the upper cover of the milk carton corresponding to the bottom annular groove of the air intake knob. The annular groove of the air intake knob is inserted into the limiting post of the upper cover of the milk carton.

[0039] When in use, open the milk box, take out the milk carton, and adjust the minimum diameter of the straw through the adjusting ear of the straw connector, then you can select the cold milk or hot milk extraction method (the larger the diameter, the more fresh milk per unit diameter in the refrigerator, and the closer the temperature is to that of fresh milk in the refrigerator when foaming; the larger the diameter, the less fresh milk per unit diameter in the refrigerator, and the closer the temperature is to that of hot milk when foaming); then, while inserting the steam connector of the milk foaming device into the steam interface fixed on the machine body, the milk box and the milk carton are integrally fixed to one side of the machine body through the buckle hook of the swing rod lock button and the protrusion at this position. Rotate the air intake knob to unlock and adjust the air intake intensity, and the milk in the milk box can be directly extracted or extracted after being mixed with hot water. When adding milk, press the pressing head of the swing rod lock button to take out the milk box and the milk carton, open the milk box, add fresh milk in the refrigerator to the milk box, and after the milk box is reinstalled into the milk carton, the whole is reinstalled on one side of the machine body.

[0040] As Figure 12 and Figure 13 shown, the shapes of the long strip-shaped orifice at the liquid suction channel and the special-shaped orifice of the straw connector are not limited to the above structures. They are respectively used as the moving orifice and the stationary orifice, and it is only necessary to satisfy the relative movement between the moving orifice and the stationary orifice to adjust the change of the minimum flow area in the axial direction between the gas-liquid suction channel and the air suction channel.

[0041] In summary, the present invention provides a solution that can provide two kinds of milk foams, cold and hot, with only one milk carton set, so as to reduce the operation difficulty of users and lower the overall cost of the machine. The milk foaming device includes a steam input channel, an air suction channel, a gas-liquid suction channel, and a milk foam output channel, and the above four channels are interconnected. The milk foaming device includes a regulating mechanism as a valve body, and the regulating mechanism is used to regulate the minimum flow area of the gas-liquid suction channel, and at least two specifications of minimum flow areas are realized through the regulating mechanism to match the optimal gas-liquid suction channels required for making cold and hot milk foams.

Claims

1. A milk frothing device, comprising a milk box (1) and a milk case, wherein the bottom of the milk case is buckled with the box opening at the top of the milk box, and a regulating mechanism is provided in the milk box, wherein the regulating mechanism comprises a steam input channel (1101), an air suction channel (501), a gas-liquid suction channel (502) and a milk froth output channel (503), wherein the four channels are interconnected, a suction pipe (3) of the regulating mechanism in the milk box extends into the milk box, the suction pipe is connected to the gas-liquid suction channel of the regulating mechanism through a suction pipe connector (4), a steam connector (11) is provided on one side of the steam input channel of the regulating mechanism, one side of the air suction channel of the regulating mechanism is connected to an air pressure hole (701) of an air intake valve (7) at an air intake knob (10), and a milk outlet pipe (6) on one side of the milk froth output channel of the regulating mechanism extends out of the milk box; characterized in that The main body of the regulating mechanism is a four-way valve body (5), which is fixedly arranged in the milk box. The gas-liquid suction channel (502) of the valve body and the circular end surface of the top of the straw connector (4) are respectively provided with a static hole and a moving hole. The moving hole and the static hole move relative to each other to adjust the change of the minimum flow area between the gas-liquid suction channel and the air suction channel along the axial direction.

2. The milk frothing device according to claim 1, characterized in that The opening at the gas-liquid suction channel (502) of the valve body (5) is in the shape of a long strip and is a static hole. The moving hole at the circular end surface of the top of the straw connector (4) at the gas-liquid suction channel of the valve body is a special-shaped hole (401). The special-shaped hole of the straw connector is eccentrically arranged on one side of the circular end surface of the top of the straw connector. The special-shaped hole is in the shape of an arc and increases from one end to the other end. A protruding adjustment ear (402) is provided on one side of the straw connector extending out from the bottom of the valve body. The straw connector and the straw (3) are integrally formed.

3. The milk frothing device according to claim 1, characterized in that One end of the steam connector (11) on the steam input channel side of the valve body (5) extends out of the milk box, the air intake valve (7) on the air intake channel side of the regulating mechanism is connected to the air intake knob (10) on the top of the milk box, the air intake channel is aligned with the air pressure hole (701) of the air intake valve, a steam connector (11) is provided in the main channel at one end of the valve body, the other end of the steam connector is inserted into and fixed in the valve body through a conical boss at the end of the steam connector, triangular notches (1102) are symmetrically provided on both sides of the boss of the steam connector, and the center hole at the boss of the steam connector is The steam input channel (1101) of the steam connector is aligned with the milk froth output channel (503) in the main channel of the valve body, a channel gap (504) is provided at the opening between the steam input channel of the steam connector and the milk froth output channel of the valve body, an air suction channel (501) is provided in the main channel of the valve body above the steam input channel of the steam connector, and a gas-liquid suction channel (502) is provided in the main channel of the valve body below the steam input channel of the steam connector, and sealing rings or sealing connections are provided at the connection points between the steam connector, the straw connector (4), the milk outlet pipe (6) and the valve body.

4. The milk frothing device according to claim 3, characterized in that The gas-liquid suction channel (502) below the air suction channel (501) in the main channel of the valve body (5) is vertically offset and eccentrically arranged on the milk foam output channel (503).

5. The milk frothing device according to claim 4, characterized in that A through transverse hole (403) is provided in the middle of the straw connector where the straw connector (4) and the lower chamber of the gas-liquid suction channel (502) of the valve body (5) are sheathed, and the upper irregular hole (401) in the transverse hole is staggered with the lower straw hole.

6. The milk frothing device according to claim 1, characterized in that The milk box is provided with a swing lever lock button (8), and the milk box comprises an upper cover (9) and a lower cover (2). One end of the swing lever lock button is hingedly fixed to a pin (201) at the top of the lower cover of the milk box, and a snap hook (801) at the other end of the swing lever lock button extends out of the upper cover of the milk box. A raised pressing head (802) is provided on one side of the middle arc-shaped arch of the swing lever lock button, and the pressing head of the swing lever lock button extends out of a button hole on one side of the upper cover of the milk box. The milk cover is fixed to a hook groove on one side of the body through the snap hook of the swing lever lock button, and one side of the middle arc-shaped arch of the swing lever lock button is arranged on the outside of the valve body (5) in the milk box.

7. The milk frothing device according to claim 6, characterized in that A raised rectangular groove is provided on the outer diameter of the milk box upper cover (9) at the snap hook (801) of the swing lever lock button (8), and the snap hook of the swing lever lock button is aligned with one side opening of the rectangular groove of the milk box upper cover.

8. The milk frothing device according to claim 6, characterized in that The snap hook (801) of the swing lever lock button (8) and the rectangular groove of the milk box upper cover (9) are arranged on one side of the milk box upper cover above the steam joint (11), and the end extending out of the steam joint (11) of the milk box is in the form of an isosceles trapezoidal head.

9. The milk frothing device according to claim 6, characterized in that The milk box (1) and the milk box are rectangular in shape, respectively; the steam joint (11) is arranged on one side of a short side of the milk box, and the milk outlet pipe (6) is arranged on one side of a long side of the milk box.

10. The milk frothing device according to claim 9, characterized in that The steam joint (11) extends out of the lower cover (2) of the milk box at the milk box in the milk box (1) and corresponds to a semicircular opening on one side of the box opening at the top of the milk box. A ring is provided on one side of the bottom of the protruding part of the steam joint of the lower cover of the milk box. The steam joint extends into the main channel of the valve body (5) through the ring of the lower cover of the milk box. At the same time, a lock column (1103) protruding on one side of the outer diameter of the steam joint is screwed into the opening of the spiral groove at the hole opening on one side of the main channel of the valve body and is buckled and fixed to the lock hole at the bottom of the spiral groove.

11. The milk frothing device according to claim 9, characterized in that The milk outlet pipe (6) extends out in an L-shape through a pipe hole in a groove on one side of the lower cover (2) of the milk box to a U-shaped opening on one side of the top box opening of the milk box (1). The U-shaped opening of the lower cover of the milk box corresponds to the upper U-shaped opening of the cover of the upper cover (9) of the milk box and the inner U-shaped groove at the top of the groove of the lower cover of the milk box.

12. The milk frothing device according to claim 11, characterized in that The milk outlet pipe (6) comprises an L-shaped pipe seat (601) and an oblique pipe head (602) with one end tilted up, and the connection between the L-shaped pipe seat and the oblique pipe head of the milk outlet pipe is respectively provided with a column portion and a groove with symmetrical convex ribs on both sides of the annular ring, and a special-shaped gasket (603) of a corresponding shape.

13. The milk frothing device according to claim 1, characterized in that The knob sleeve at the bottom of the air inlet knob (10) is symmetrically provided with positioning ribs (1001) on both sides, and the positioning ribs of the air inlet knob are inserted into the positioning grooves corresponding to the inner diameters of the two sides of the knob hole at the top of the milk box cover (9). At the same time, the knob sleeve of the air inlet knob is inserted into the air inlet valve (7), and the inner wall of the air inlet valve is provided with a spiral air inlet groove (702), and a strip groove (1002) is provided on the outer diameter side of the knob sleeve at the bottom of the air inlet knob corresponding to the air inlet groove. Limiting blocks (703) larger than the knob hole at the top of the milk box cover are provided on both sides of the top opening of the air inlet valve, and the limiting blocks of the air inlet valve are buckled and fixed to the block holes on both sides of the top opening of the valve body (5).

14. The milk frothing device according to claim 9, characterized in that Integrally formed limiting ribs (1003) are symmetrically arranged on both sides of the bottom annular groove above the knob sleeve of the air intake knob (10), and a raised limiting column is arranged on the outer side of the knob hole at the top of the milk box upper cover (9) corresponding to the annular groove at the bottom of the air intake knob, and the limiting column of the milk box upper cover is inserted into the annular groove of the air intake knob.

15. A coffee machine comprising the milk frothing device according to any one of claims 1 to 14, characterized in that The milk box (1) and the milk case are connected as a whole and are arranged on one side of the machine body, and the steam connector (11) extending out of the milk case is inserted into a steam interface fixed to the machine body.

16. The coffee machine according to claim 15, characterized in that When the steam connector (11) is inserted into the steam interface fixed to the machine body, the snap hook (801) extending from one end of the swing rod lock button (8) is snapped into the hook groove of the machine body, the protrusion at the milk box of the snap hook is inserted into the side groove of the hook groove of the machine body, one end of the swing rod lock button in the milk box extends out of the snap hook and is arranged on one side opening of the protrusion above the steam connector or the rectangular groove, the other end of the swing rod lock button in the milk box is hinged and fixed in the milk box, and the pressing head (802) on one side of the middle of the swing rod lock button in the milk box extends out of the milk box.

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