Milk emulsification air inlet structure, milk emulsifier and coffee machine

Abstract

The utility model discloses a milk emulsification air inlet structure, a milk emulsifier and a coffee machine, belongs to the coffee beverage brewing technology, and solves the problem that the performance of products produced in batches is unstable due to the fact that the aperture of an air inlet hole of an existing milk emulsifier is small and the aperture difference is large. A ball is placed in the funnel part, the diameter of the ball is larger than the inner diameter of the air hole and leans against the inner wall of the funnel part, and the surface of the ball is matched with the inner wall of the funnel part to form an airflow channel. Accordingly, the air inflow is determined through the air flow channel instead of the air holes. As the inner wall of the funnel part and the surface of the ball have outlines which are far larger than those of the air holes, when the surface of the ball is matched with the inner wall of the funnel part to form the air flow channel, even if some small errors are generated during processing, the errors are only smaller differences relative to the inner wall of the funnel part or / and the surface of the ball, so that the stability of the air flow channel is ensured, and the service life of the air flow channel is prolonged. And stable performance of products produced in batches is ensured.

Description

Technical Field

[0001] The utility model belongs to the technology of coffee beverage brewing, and particularly relates to a milk emulsification air intake structure, a milk emulsifier and a coffee machine. Background Art

[0002] A milk coffee is a mixture of coffee and milk foam. For a cup of high-quality milk coffee, high-quality coffee and delicate and stable milk foam are required. Milk foam is formed by fine air bubbles being wrapped by fine milk liquid. Therefore, the stability and consistency of the amount of air entering the milk emulsifier (or called milk foam emulsifier) are very important.

[0003] In the existing milk emulsifiers on the market, most of the air intake methods adopt round holes with a pore diameter of 0.5 mm to 1.2 mm or square grooves with a width and depth of 0.3 mm to 1.2 mm. The round holes and square grooves are collectively called air holes. Such a design has too high requirements for molds and processes. A very small error during processing will cause a large difference in the pore diameter specifications of the air holes, resulting in unstable product performance in batch production. Summary of the Utility Model

[0004] The technical problem to be solved and the technical task proposed by the utility model are to overcome the defect that the large difference in the pore diameter caused by the small air intake holes of the existing milk emulsifiers results in unstable product performance in batch production, and to provide a milk emulsification air intake structure, a milk emulsifier and a coffee machine, aiming to ensure the air intake stability of the milk emulsifier.

[0005] To achieve the above purpose, the milk emulsification air intake structure of the utility model includes:

[0006] An air hole, arranged vertically;

[0007] A funnel part, which is located above the air hole and has a large upper end and a small lower end. The lower end of the funnel part is communicated with the air hole;

[0008] A ball, which is located in the funnel part, has a diameter larger than the inner diameter of the air hole and relies on the inner wall of the funnel part. The surface of the ball and the inner wall of the funnel part cooperate to form an air flow channel.

[0009] Accordingly, the air intake amount is determined by the air flow channel rather than the air hole. Since the inner wall of the funnel part and the surface of the ball have a contour much larger than that of the air hole, when the air flow channel is formed by the cooperation of the surface of the ball and the inner wall of the funnel part, even if some very small errors occur during processing, these errors are only relatively small differences relative to the inner wall of the funnel part or / and the surface of the ball, thus ensuring the stability of the air flow channel and the stable performance of the products in batch production.

[0010] In one embodiment, the inner wall of the funnel part is a first conical surface, the first conical surface or / and the surface of the ball is a rough surface, and the air gaps in the rough surface form an air flow channel. The air flow channel of this structure depends on the roughness of the rough surface. Once the mold for processing the rough surface is made, the roughness of the rough surface processed by the mold will stabilize, ensuring the consistency of the air flow channel during mass production and guaranteeing the stable performance of the products produced in batches.

[0011] In one embodiment, the inner wall of the funnel part is a first conical surface, and groove-shaped patterns are distributed on the first conical surface or / and the surface of the ball. The groove-shaped patterns form an air flow channel. The air flow channel of this structure depends on the density of the groove-shaped patterns and the size of each groove. The groove-shaped patterns can be formed by embossing with a mold. Once the embossing mold is made, the groove-shaped patterns processed by the embossing mold will remain stable, ensuring the consistency of the air flow channel during mass production and guaranteeing the stable performance of the products produced in batches.

[0012] In one embodiment, the inner wall of the funnel part is a first conical surface, and grooves are distributed on the first conical surface. The grooves form an air flow channel. The air flow channel of this structure depends on the number of grooves and the size of each groove. Compared with the prior art, even if some very small errors occur during the processing of the grooves on the first conical surface, these errors are only relatively small differences relative to the first conical surface, thus ensuring the stability of the air flow channel and the stable performance of the products produced in batches.

[0013] In one embodiment, the inner wall of the funnel part is composed of at least three connected inclined surfaces, and corners are formed at the connecting parts of the inclined surfaces. The corners form an air flow channel. Accordingly, the air flow channel of this structure depends on the number of corners and the size of each corner. This mechanism forms at least three corners on the inner wall of the funnel part. Each corner is a relatively small part relative to the inner wall of the funnel part. Therefore, even if some very small errors occur in the processed corners, these errors are only relatively small differences relative to the first conical surface, thus ensuring the stability of the air flow channel and the stable performance of the products produced in batches.

[0014] Preferably, the diameter of the air hole is 2 - 6 mm, which reduces the processing difficulty.

[0015] A milk emulsifier according to an embodiment of the present invention includes a steam channel and an air channel. The outlet end of the steam channel and the outlet end of the air channel converge in a confluence area. The air channel is configured with the milk emulsifying air intake structure of the present invention. When working, the outlet end of the steam channel and the outlet end of the air channel of this milk emulsifier are inserted into the milk. As the steam flows, a negative pressure is generated in the confluence area, sucking in air and releasing it into the milk to emulsify the milk. Since this milk emulsifier is configured with the milk emulsifying air intake structure, the air intake volume can be precisely controlled, and delicate and uniform milk foam can be produced.

[0016] Preferably, this milk emulsifier includes:

[0017] A body having a front section of a steam channel;

[0018] A steam pipe connected to the body, the lumen of which is connected to the front section to form the steam channel;

[0019] A sleeve sleeved outside the steam pipe and maintaining a gap between the sleeve and the steam pipe, the gap forming the air channel, and a milk emulsification air intake structure being arranged in the sleeve.

[0020] Accordingly, the milk emulsifier is convenient for disassembly and cleaning.

[0021] Preferably, the outlet end of the sleeve is made into a reduced opening, and the outer wall of the outlet end of the steam pipe is made into a second conical surface, and the second conical surface is located within the reduced opening. This enhances the negative pressure during the operation of the confluence area, especially facilitating the formation of a swirl.

[0022] The milk emulsifier according to another embodiment of the present invention includes:

[0023] An emulsification area;

[0024] A steam channel, an air channel, and a milk channel located upstream of the emulsification area and communicating with the emulsification area; and,

[0025] A milk foam channel located downstream of the emulsification area and communicating with the emulsification area;

[0026] Wherein, the air channel is configured with the milk emulsification air intake structure of the present invention.

[0027] For this milk emulsifier, the inlet of the milk channel is placed in the milk. As the steam flows, milk and air are inhaled and mixed. After the milk is emulsified in the emulsification area, milk foam is output through the milk foam channel. Since it is configured with a milk emulsification air intake structure, the air intake volume can be precisely controlled to produce delicate and uniform milk foam.

[0028] Preferably, the milk emulsifier includes a preheating area located upstream of the emulsification area and adjacent to the emulsification area, and the emulsification area communicates with the steam channel, the air channel, and the milk channel through the preheating area. Accordingly, the milk and air can be preheated first and then emulsified to produce more delicate and uniform milk foam.

[0029] Preferably, the air channel and the milk channel converge to a mixing area, the mixing area then converges with the steam channel through a channel to the preheating area, and the preheating area communicates with the milk foam channel through the emulsification area. Accordingly, the milk and air can be fully mixed first, and then delicate and uniform milk foam can be obtained through preheating and emulsification.

[0030] The coffee machine of the present utility model includes a water tank, a water pump, and a heater that are sequentially connected in series through pipelines. The downstream of the heater is connected to the steam passage of the milk emulsifier of the present utility model through a pipeline. Accordingly, the automatic emulsification of milk is achieved. Since it is equipped with a milk emulsification air intake structure, the air intake can be precisely controlled, and delicate and uniform milk foam can be produced.

[0031] Preferably, the downstream of the heater is connected to a coffee brewer through a pipeline, and the heater alternatively conveys steam to the milk emulsifier or hot water to the coffee brewer. Accordingly, with a set of water tank, water pump, and heater, steam can be conveyed to the milk emulsifier, and hot water can also be conveyed to the coffee brewer. The structure is simplified.

[0032] In the present utility model, a funnel part is arranged above the vertically arranged air holes. A ball is placed inside the funnel part. The diameter of the ball is larger than the inner diameter of the air holes and it relies on the inner wall of the funnel part. The surface of the ball and the inner wall of the funnel part cooperate to form an air flow passage. Accordingly, the air intake is determined by the air flow passage rather than the air holes. Since the inner wall of the funnel part and the surface of the ball have a contour much larger than that of the air holes, when the air flow passage is formed by the cooperation of the surface of the ball and the inner wall of the funnel part, even if there are some very small errors during processing, these errors are only relatively small differences compared to the inner wall of the funnel part or / and the surface of the ball, thus ensuring the stability of the air flow passage and the stable performance of the products produced in batches. Description of the Drawings

[0033] Figure 1 Is an axonometric view of the coffee machine according to an embodiment of the present utility model;

[0034] Figure 2 Is Figure 1 The water circuit schematic diagram of the coffee machine shown;

[0035] Figure 3 Is a cross-sectional structural schematic diagram of the milk emulsifier according to an embodiment of the present utility model;

[0036] Figure 4 Is Figure 3 The enlarged schematic diagram of the milk emulsification air intake structure in;

[0037] Figure 5 Is Figure 4 The schematic diagram of the funnel part in a top-down view;

[0038] Figure 6 Is the schematic diagram of the funnel part in a top-down view of the second embodiment;

[0039] Figure 7 Is the schematic diagram of the funnel part in a top-down view of the third embodiment;

[0040] Figure 8 Is the schematic diagram of the funnel part in a top-down view of the fourth embodiment;

[0041] Figure 9 Schematic cross-sectional structure diagram of the milk emulsifier according to another embodiment of the present invention;

[0042] Description of the reference numerals in the figure:

[0043] 100 Milk emulsification air intake structure:

[0044] 110 Air holes;

[0045] 120 Funnel part, 121 First conical surface, 122 Rough surface, 123 Grooved pattern, 124 Groove, 125 Inclined surface, 126 Angle;

[0046] 130 Ball;

[0047] 20A, 20B Milk emulsifiers:

[0048] 201 Steam channel, 202 Air channel, 203 Emulsification area, 204 Milk channel, 205 Froth channel, 206 Preheating area, 207 Mixing area;

[0049] 210 Body, 211 Front section;

[0050] 220 Steam pipe, 221 Second conical surface;

[0051] 230 Sleeve, 231 Reduced opening;

[0052] 240 Gap;

[0053] 250 Confluence area;

[0054] 300 Coffee machine: 301 Water tank, 302 Water pump, 303 Heater, 304 Solenoid valve, 305 Check valve, 306 Pressure maintaining valve, 307 Safety valve, 308 Flow meter, 309 Return water box, 310 Coffee liquid outlet assembly, 311 Coffee brewer;

[0055] 400 Coffee cup. Detailed implementation manners

[0056] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0057] The terms "comprising" and "having" and any variations thereof in the description and claims of the present utility model are intended to cover non-exclusive inclusion. For example, a method or product comprising a series of technical features does not necessarily have to be limited to those clearly listed technical features, but may also include other technical features that can be included in the method or product but are not clearly listed.

[0058] The present utility model will be introduced in detail below in conjunction with specific embodiments and the accompanying drawings.

[0059] Figure 1 A perspective view of a coffee machine 300 showing an embodiment is presented.

[0060] Figure 2 Shows Figure 1 The water path of the coffee machine 300 shown: The water path includes a water tank 301, a water pump 302, and a heater 303 that are sequentially connected by pipelines. Downstream of the heater 303, it is connected to a coffee brewer 311 and Figure 3 the steam passage 201 of the milk emulsifier 20A shown. During operation, the water stored in the water tank 301 is transported by the water pump 302 to the heater 303. By changing the power of the heater or / and the water flow rate, the water flowing through the heater can be heated into hot water or steam. Among them, a check valve 305 is connected in the inlet pipeline of the coffee brewer 20A to prevent hot water from flowing back. An electromagnetic valve 304 is connected to the pipeline in front of the coffee brewer 311. The coffee brewer 311 and the electromagnetic valve 304 are in parallel with the coffee brewer 20A and the check valve 305. Therefore, the flow direction of the fluid is controlled by closing and opening the electromagnetic valve 304. When the electromagnetic valve 304 is closed, hot water is transported to the coffee brewer 311 to brew (extract) coffee beverages, and the coffee beverages flow from the coffee liquid outlet assembly 310 to the coffee cup 400. When the electromagnetic valve 304 is opened, steam is transported to the milk emulsifier 20A to emulsify the milk into milk foam.

[0061] Among them, the outlet of the coffee brewer 311 is connected to a pressure maintaining valve 306, which is used to maintain the water pressure in the coffee brewer at a set pressure. When the pressure is less than the set pressure of the pressure maintaining valve 306, the brewed coffee beverages cannot flow out from the coffee liquid outlet assembly 310. Also, when the electromagnetic valve 304 is opened to transport steam to the milk emulsifier 20A, the steam flow to the coffee brewer 311 can also be blocked. A safety valve 307 is connected to the pipeline between the heater 303 and the water pump 302. When the water pressure is too high, the water flow is relieved to the water return box 309 through the safety valve. A flow meter 308 is connected to the pipeline between the water pump 302 and the water tank 301 to measure the water flow.

[0062] As Figure 1 shown, the milk emulsifier 20A is installed on the front side of the coffee machine 300 for easy operation.

[0063] In other embodiments, steam and hot water can be respectively conveyed by two sets of water tanks, water pumps and heaters.

[0064] In other embodiments, Figure 3 the milk emulsifier 20A shown can be Figure 9 replaced by the milk emulsifier 20B shown.

[0065] Such as Figure 3 the milk emulsifier 20A shown, which includes a main body 210, a steam pipe 220 and a sleeve 230. The main body 210 has a front section 211 of a steam channel. The steam pipe 220 is connected to the main body 210, and the lumen of the steam pipe 220 is connected to the front section 211 to form a steam channel 201. In Figure 3 it, the dotted line indicates the path of the steam channel, and the arrow marked on the dotted line indicates the flow direction of the steam. The sleeve 230 is sleeved outside the steam pipe 220 and a gap 240 is maintained between the sleeve and the steam pipe. The gap 240 forms an air channel. The outlet end of the steam channel 201 and the outlet end of the air channel 202 converge in a confluence area 250. Moreover, the outlet end of the sleeve 230 is made into a reduced opening 231, and the outer wall of the outlet end of the steam pipe 220 is made into a second conical surface 221, and the second conical surface 221 is located within the reduced opening 231. In particular, a milk emulsification air intake structure 100 located at the inlet end of the air channel is arranged on the sleeve 230. Among them, the main body 210, the steam pipe 220 and the sleeve 230 are detachable for cleaning after use.

[0066] Figure 3 For the milk emulsifier 20A shown, when steam is input from the inlet of the steam channel 201 and output from the outlet of the steam channel 201, a negative pressure is formed in the confluence area 250, and air is inhaled from the air channel 202. At this time, the confluence area 250 is extended into the milk, and the milk is impacted by the mixture of steam and air and emulsified into milk foam.

[0067] Figure 9The milk emulsifier 20B shown includes an emulsification zone 203, a steam channel 201, an air channel, a milk channel 204, and a milk foam channel 205. Among them, the emulsification zone 203 emulsifies milk by the Venturi effect. The steam channel 201, the air channel, and the milk channel 204 are located upstream of the emulsification zone 203 and communicate with the emulsification zone. The milk foam channel 205 is located downstream of the emulsification zone 203 and communicates with the emulsification zone 203. Here, the communication can be either direct communication or indirect communication. A preheating zone 206 adjacent to the emulsification zone is provided upstream of the emulsification zone 203, and the emulsification zone 203 communicates with the steam channel 201, the air channel, and the milk channel 204 through the preheating zone 206. The air channel and the milk channel 204 converge to a mixing zone 207, and the mixing zone 207 then converges with the steam channel 201 through a channel to the preheating zone 206, and the preheating zone 206 communicates with the milk foam channel 205 through the emulsification zone 203. In particular, the air channel is configured with a milk emulsification air intake structure 100. And, compared with the air channel in Figure 3 the steam channel in Figure 9 is simplified to the holes on the pipe wall of the milk channel 204, that is, it is equivalent to directly configuring the milk emulsification air intake structure 100 on the pipe wall of the milk channel.

[0068] Among them, the emulsification zone 203, the steam channel 201, the air channel, the milk channel 204, and the milk foam channel 205 are assembled by detachable pipe fittings for easy cleaning after use.

[0069] Figure 9 For the milk emulsifier 20B shown, when steam is input from the inlet of the steam channel 201 to the emulsification zone 203, a negative pressure is formed. Under the action of the negative pressure, milk is sucked through the milk channel 204 extending into the milk, and air is sucked through the milk emulsification air intake structure 100 and flows through the emulsification zone 203. When the mixture of milk, air, and steam flows through the emulsification zone 203, it is emulsified into milk foam, and the milk foam is output through the milk foam channel 205. Figure 9 In, the flow directions of milk, air, steam, and milk foam are indicated by the arrows marked on the dotted lines.

[0070] Figure 3 and Figure 9 The milk emulsifiers shown are all configured with any one of the milk emulsification air intake structures 100 in the structural forms shown in Figure 4 and Figures 5 - 8 to ensure the stability of the air intake volume.

[0071] The milk emulsification air intake structure 100 described, such as Figure 4As shown, it includes: air hole 110, funnel part 120, and ball 130. The air hole 110 is arranged vertically. The illustrated air hole is an equal-diameter hole, and in other embodiments, it can also be a variable-diameter hole. The funnel part 120 is located above the air hole 110 and presents a large upper end and a small lower end. The lower end of the funnel part 120 communicates with the air hole 110. The ball 130 is located in the funnel part 120. The diameter of the ball 130 is larger than the inner diameter of the air hole 110 and will not fall into the air hole. The ball 130 relies on the inner wall of the funnel part 120, and the surface of the ball 130 mates with the inner wall of the funnel part 120 to form an air flow channel. Therefore, even if the air hole 110 has a relatively large aperture, the air flow rate is determined by the air flow channel. Thus, when emulsifying milk, the air flow channel determines the air flow rate rather than the air hole determining the air flow rate. In this way, the diameter of the air hole 110 is 2 - 6 mm, and its precision does not need to be strictly controlled, which is conducive to processing.

[0072] As Figure 5 shown, in the first embodiment, the inner wall of the funnel part is the first conical surface 121, and the first conical surface 121 or / and the surface of the ball is the rough surface 122. The air gaps in the rough surface 122 form the air flow channel. The air flow channel of this structure depends on the roughness of the rough surface. Once the mold for processing the rough surface is made, the roughness of the rough surface processed by the mold will stabilize, and the air flow channel will be kept consistent in mass production, ensuring the stable performance of the products in mass production.

[0073] As Figure 6 shown, in the second embodiment, the inner wall of the funnel part is the first conical surface 121, and groove-like patterns 123 are distributed on the first conical surface 121 or / and the surface of the ball. The groove-like patterns 123 form the air flow channel. The air flow channel of this structure depends on the density of the groove-like patterns and the size of each groove. The groove-like patterns can be formed by mold embossing. Once the embossing mold is made, the groove-like patterns processed by the embossing mold will remain stable, and the air flow channel will be kept consistent in mass production, ensuring the stable performance of the products in mass production.

[0074] As Figure 7 shown, in the third embodiment, the inner wall of the funnel part is the first conical surface 121, and grooves 124 are distributed on the first conical surface 121. The grooves 124 form the air flow channel. The air flow channel of this structure depends on the number of grooves and the size of each groove. Compared with the prior art, when processing grooves on the first conical surface, even if there are some very small errors during processing, these errors are only relatively small differences relative to the first conical surface, thus ensuring the stability of the air flow channel and the stable performance of the products in mass production.

[0075] As Figure 8As shown, in the fourth embodiment, the inner wall of the funnel portion 120 is composed of at least three connected inclined surfaces 125. The connected portions of the inclined surfaces 125 form angles 126, and the angles 126 constitute the air flow channels. Accordingly, the air flow channels of this structure depend on the number of angles and the size of each angle. This mechanism forms at least three angles by the inner wall of the funnel portion, and each angle is a relatively small part with respect to the inner wall of the funnel portion. Therefore, even if there are some very small errors in the processed angles, these errors are only relatively small differences with respect to the first conical surface, thereby ensuring the stability of the air flow channels and the stable performance of the products in mass production.

Claims

1. Milk emulsification air intake structure, characterized in that Comprising: Air holes (110), arranged vertically; A funnel part (120), which is located above the air holes (110) and has a large upper end and a small lower end, and the lower end of the funnel part (120) is communicated with the air holes (110); A ball (130), which is located in the funnel part (120), has a diameter larger than the inner diameter of the air holes (110) and relies on the inner wall of the funnel part, and the surface of the ball forms an air flow channel in cooperation with the inner wall of the funnel part.

2. The milk emulsification air intake structure according to claim 1, characterized in that: The inner wall of the funnel part (120) is a first conical surface (121), and the first conical surface (121) or / and the surface of the ball is a rough surface (122), and the air gaps in the rough surface (122) form an air flow channel.

3. The milk emulsification air intake structure according to claim 1, characterized in that: The inner wall of the funnel part (120) is a first conical surface (121), and groove-like patterns (123) are distributed on the first conical surface (121) or / and the surface of the ball, and the groove-like patterns (123) form an air flow channel.

4. The milk emulsification air intake structure according to claim 1, characterized in that: The inner wall of the funnel part (120) is a first conical surface (121), and grooves (124) are distributed on the first conical surface (121), and the grooves (124) form an air flow channel.

5. The milk emulsification air intake structure according to claim 1, wherein: The inner wall of the funnel part (120) is composed of at least three connected inclined surfaces (125), and corners (126) are formed at the connecting parts of the inclined surfaces, and the corners (126) form an air flow channel.

6. The milk emulsification air intake structure according to any one of claims 1-5, characterized in that: The diameter of the air holes (110) is 2 - 6 mm.

7. Milk emulsifier, comprising a steam channel (201) and an air channel (202), the outlet ends of the steam channel (201) and the air channel (202) converge in a confluence area (250), characterized in that: The air channel (202) is configured with the milk emulsification air intake structure (100) according to any one of claims 1 - 6.

8. The milk emulsifier according to claim 7, characterized in that Comprising: A body (210), which has a front section (211) of a steam channel; A steam pipe (220), which is connected to the body (210), and its pipe cavity is connected to the front section (211) to form the steam channel (201); A sleeve (230), which is sleeved outside the steam pipe (220) and a gap (240) is maintained between the sleeve and the steam pipe, and the gap (240) forms the air channel, and the milk emulsification air intake structure (100) is configured on the sleeve (230).

9. The milk emulsifier according to claim 8, characterized in that Comprising: The outlet end of the sleeve (230) is made into a reduced opening (231), and the outer wall of the outlet end of the steam pipe (220) is made into a second conical surface (221), and the second conical surface (221) is located in the reduced opening (231).

10. Milk emulsifier, characterized by Comprising: An emulsification area (203); A steam channel (201), an air channel and a milk channel (204) located upstream of the emulsification area (203) and communicated with the emulsification area; and, A milk foam channel (205) located downstream of the emulsification area (203) and communicated with the emulsification area; Wherein, the air channel is configured with the milk emulsification air intake structure (100) according to any one of claims 1 - 6.

11. The milk emulsifier according to claim 10, characterized in that Comprising: A preheating area (206) located upstream of the emulsification area (203) and adjacent to the emulsification area, and the emulsification area (203) is communicated with the steam channel (201), the air channel and the milk channel (204) through the preheating area (206).

12. The milk emulsifier according to claim 11, characterized in that Comprising: The air channel and the milk channel (204) converge to a mixing area (207), the mixing area (207) is then converged to the preheating area (206) through a channel with the steam channel (201), and the preheating area (206) is communicated with the milk foam channel (205) through the emulsification area (203).

13. Coffee machine, comprising a water tank (301), a water pump (302) and a heater (303) which are connected in sequence through pipelines, characterized in that: The steam passage (201) of the milk emulsifier according to any one of claims 7-12 is connected downstream of the heater (303) via a pipeline.

14. The coffee machine according to claim 13, characterized in that: The heater (303) is connected downstream to the coffee brewer (311) via a pipeline. The heater (303) alternatively conveys steam to the milk emulsifier or conveys hot water to the coffee brewer (311).

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