Mixing mechanism, beverage brewing equipment and beverage preparation method

Abstract

A mixing mechanism (100), a beverage brewing device (1000) and a beverage preparation method, the mixing mechanism (100) comprises a pipeline (10) extending from an inlet end (11) to an outlet end (12), a flow path channel (20) is formed in the pipeline (10), a fluid in a gas-liquid mixed state is guided from the inlet end (11) to the outlet end (12), and a beverage with foam is formed. The size of the cross section of the flow path channel (20) in the flow direction of the fluid is at least partially reduced in the flow direction, and the flow speed is reduced when the fluid flows through the section of the flow path channel (20) which is in the reduced trend, so that gas and liquid in the fluid are gradually mixed, and the foamed beverage with stable quality is formed. The mixing mechanism (100) has a good foaming effect, and the pipeline (10) has a relatively large inner diameter, is not easy to block and is easy to clean, so that the beverage brewing equipment (1000) is easy to clean and maintain, and the quality of the beverage can be improved.

Description

Mixing mechanism, beverage dispensing equipment and beverage preparation method Technical Field

[0001] The present invention relates to the technical field of beverage dispensing, and in particular to a mixing mechanism, beverage dispensing equipment and a beverage preparation method. Background Art

[0002] Beverage preparation equipment, such as coffee machines or fully automatic milk frothers, requires frothing when preparing beverages. Specifically, air can be mixed into milk to create a dense foam, enhancing the taste of the drink. Existing technical solutions typically utilize flow restrictors, labyrinth devices, or pressurizing devices to extend the mixing time between milk and air to achieve frothing.

[0003] The flow limiting device mainly slows down the flow of liquid at the gear pump outlet, allowing the milk and air to fully mix (the flow rate is usually controlled between 2-10g / s). However, the flow limiting device needs to be cleaned promptly. If it is not cleaned promptly, the flow limiting hole will be blocked by milk scale, causing the pipeline to be unable to transport the beverage or causing beverage contamination. The maze device mainly allows the milk and air to fully mix by increasing the length of the common flow path of the gas-liquid mixture. However, the maze device has a complex structure, high processing difficulty, and many sanitary dead corners. It is not easy to be cleaned by cleaning fluid. After a long time, it will contaminate the entire milk system. In addition, the fluid is accelerated and decelerated many times during the mixing process, causing multiple increases and decreases in pressure and turbulence, resulting in unstable milk foam quality. During the milk foam production process, the pressure of the gas-liquid mixture in the booster device directly increases, making it impossible for the milk and air to fully blend, and the quality of the beverage is difficult to control. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a mixing mechanism, a beverage dispensing device and a beverage preparation method that are not easy to clog, easy to clean, and have a stable and easy-to-control foaming effect.

[0005] In order to solve the above technical problems, the present invention provides a mixing mechanism, comprising:

[0006] A pipeline having an inlet end and an outlet end, the pipeline extending from the inlet end to the outlet end, a flow channel connecting the inlet end and the outlet end is formed in the pipeline, the cross-sectional size of the flow channel in the flow direction of the fluid at least partially tends to decrease in the flow direction, and the flow velocity of the fluid slows down when flowing through the section of the flow channel with a decreasing trend.

[0007] In one embodiment, the flow channel includes a plurality of flow channel sections that are interconnected in the extending direction of the pipeline, and the flow directions of every two adjacent flow channel sections are different.

[0008] In one embodiment, in the extending direction of the pipeline, the maximum cross-sectional dimensions of the plurality of flow channel segments decrease in sequence.

[0009] In one embodiment, in each of the flow channel segments, the cross-sectional size of the flow channel segment gradually decreases along the flow direction; or,

[0010] In each of the flow channel segments, the cross-sectional dimensions of the flow channel segment vary segmentally along the flow direction, and the cross-sectional dimensions of the upstream of the flow channel segment in the flow direction are larger than the cross-sectional dimensions of the downstream thereof; or,

[0011] The cross-sectional dimensions of the plurality of flow channel sections gradually decrease in a step-like manner.

[0012] In one embodiment, the inner diameter of the inlet end is r1, the inner diameter of the outlet end is r2, and the ratio of r1 to 2r2 is greater than 1 and less than or equal to 3; and / or,

[0013] The fluid pressure at the inlet end is P1, the fluid pressure at the outlet end is P2, and the ratio of P2 to P1 is greater than or equal to 1.5 and less than or equal to 4; and / or,

[0014] The fluid flow rate at the inlet end is V1, the flow rate at the outlet end is V2, and the ratio of V1 to V2 is greater than or equal to 2.

[0015] In one embodiment, each of the flow channel segments is arranged in a spiral shape rotating around a rotation axis, and the extension direction of the rotation axis is the same as the extension direction of the pipeline; and / or,

[0016] Among the plurality of flow channel segments, the rotation directions of every two adjacent flow channel segments in the pipeline extending direction are opposite.

[0017] In one embodiment, the mixing mechanism further includes a core body inserted in the pipeline, wherein the core body and the inner wall of the pipeline define the flow channel, wherein the core body can be integrally formed or detachably inserted in the pipeline.

[0018] In one embodiment, the core includes a plurality of guide plates arranged in sequence along the extension direction of the pipeline, each guide plate is arranged in a rotating spiral shape, and the rotation directions of each two adjacent guide plates in the extension direction of the pipeline are opposite.

[0019] In one embodiment, each of the guide plates extends radially toward the wall of the pipeline, so that two flow channel spaces separated from each other are formed between two sides of each section of the guide plate and the wall of the pipeline.

[0020] In one embodiment, the flow channel is provided with a rotation axis, and the rear end plate edge of each section of the guide plate in the flow direction is rotated around the rotation axis by a specific angle compared with the front end plate edge thereof.

[0021] In one embodiment, the specific rotation angle is greater than 350 degrees and less than 370 degrees.

[0022] In one embodiment, in the normal plane of the rotation axis, the front plate edge of the guide plate in the latter section intersects with the rear plate edge of the guide plate in the former section at a specific angle.

[0023] In one embodiment, the specific angle is greater than 80 degrees and less than 100 degrees.

[0024] In one embodiment, the inner diameter of the pipeline gradually decreases along the extending direction of the pipeline, and the outer diameter of the core gradually decreases along the extending direction of the pipeline.

[0025] In one embodiment, an angle b between an outer contour line of the core along the axial direction and the rotation axis is greater than 0 degrees and less than or equal to 10 degrees.

[0026] In one embodiment, the pipeline has an opening at the inlet end, and the core is removably inserted into the pipeline through the opening. The opening is located along the path extending in the direction of the flow channel, and the mixing mechanism further includes a sealing member for sealing the opening. 17. The mixing mechanism of claim 16, wherein the pipeline extends in the vertical direction of gravity, the inlet end is located at the lower end of the pipeline, and the core is inserted into the pipeline from bottom to top through the opening.

[0027] In one embodiment, a protrusion extending toward the sealing element is provided on the core body, and the protrusion is provided on the flow path of the fluid introduced into the flow channel.

[0028] In one embodiment, a through hole is opened on the circumference of the pipeline, and the through hole is arranged relatively close to the inlet end and is used to introduce fluid into the flow channel.

[0029] In one embodiment, a protruding structure is provided on the inner periphery of the pipeline, and the protruding structure defines the flow channel.

[0030] In order to solve the above technical problems, the present invention provides a beverage dispensing device, comprising:

[0031] a body having a beverage outlet;

[0032] a mixing mechanism disposed in the machine body, the mixing mechanism including a pipeline, the pipeline having an inlet end and an outlet end, the pipeline extending from the inlet end to the outlet end, a flow channel connecting the inlet end and the outlet end formed in the pipeline, the cross-sectional size of the flow channel decreasing in the flow direction of the fluid, wherein the flow channel includes a plurality of flow channel segments sequentially adjacent and interconnected in the extension direction of the pipeline, and the flow directions of each two adjacent flow channel segments are different, the pipeline is provided with a through hole relatively close to the inlet end, and the outlet end is connected to the beverage outlet; and,

[0033] A delivery pipe, wherein the output end of the delivery pipe is connected to the flow channel through the through hole.

[0034] The fluid flow rate at the output end is V, the fluid flow rate at the outlet end is V2, V2 is less than or equal to 0.5V (0.5 times V); and / or,

[0035] The inner diameter of the delivery pipe at the output end is less than or equal to the minimum inner diameter of the pipeline; and / or,

[0036] The inner diameter of the delivery pipe at the output end is r, and the inner diameter of the inlet end is r1, and r1 is greater than 2r.

[0037] In one embodiment, the beverage mixing equipment further includes a fluid pump, a pulse air valve and a heating device, wherein the fluid pump is used to pump fluid into the delivery pipe, the pulse air valve is used to open and close intermittently, and the heating device is arranged downstream of the outlet end.

[0038] In one embodiment, temperature sensors are respectively provided upstream of the fluid pump and the heating device, and the beverage brewing equipment further includes a control device, which is electrically connected to the temperature sensor, the fluid pump, the pulse air valve and the heating device. The control device is used to obtain milk foam temperature-related parameters and the detection results of the temperature sensor, so as to control the operation of the fluid pump, the pulse air valve and the heating device according to the milk foam temperature-related parameters and the detection results of the temperature sensor.

[0039] In one embodiment, the beverage brewing equipment also includes a control device, which is electrically connected to the fluid pump and the pulse air valve and is used to obtain parameters related to the thickness of the beverage milk foam. The control device controls the operation of the fluid pump and the pulse air valve according to the parameters related to the milk foam thickness.

[0040] In one embodiment, a mounting plate is provided on the outer circumference of the pipeline, the mixing mechanism is mounted on the body through the mounting plate, the outlet end is connected to a three-way valve through a quick connector, and the three-way valve is connected to the beverage outlet and the waste outlet respectively.

[0041] In order to solve the above technical problems, the present invention provides a beverage dispensing device, comprising:

[0042] a mixing mechanism comprising a pipeline arranged in a vertical direction, the pipeline comprising an inlet end at a lower end and an outlet end at an upper end, a flow channel formed between the inlet end and the outlet end, the fluid flowing from bottom to top through the flow channel in a direction counter to gravity, the pipeline having a through hole relatively close to the inlet end; and;

[0043] a delivery pipe, arranged transversely relative to the pipeline direction, communicating with the flow channel through the through hole, the delivery pipe and the flow channel forming an angle;

[0044] Wherein, the transverse cross-sectional dimension of the flow channel in the flow direction of the fluid tends to decrease.

[0045] In one embodiment, the inlet end of the mixing mechanism is provided with an opening penetrating downward, a core body provided in the pipeline and pluggable from the opening, and a sealing member for covering the opening.

[0046] In one embodiment, a downwardly protruding column is provided at the lower end of the core body, the column is located in the flow channel, and the height of the column is greater than the inner diameter of the transversely arranged delivery pipe.

[0047] In one embodiment, when the fluid flows from the delivery pipe into the flow channel, it first contacts the protrusion laterally and then bends to flow along the flow channel.

[0048] In one embodiment, the highest point of the sealing member when installed in the flow channel does not exceed the highest point of the inner diameter height of the delivery pipe.

[0049] In one embodiment, an elastic device is sleeved on the outer periphery of the boss, and the elastic device is fixed between the core and the sealing member.

[0050] In one embodiment, the delivery pipe is arranged at an angle of 90 degrees to the pipeline.

[0051] To solve the above technical problems, the present invention provides a method for preparing a beverage, which prepares a beverage according to beverage parameters preset in a beverage mixing device or manually input by the beverage mixing device, and the preparation method comprises:

[0052] Get the volume of milk foam Vs to be prepared and the speed V of the fluid pump set in the brewing equipment 0、 And the air intake volume Z0 of a single opening and closing of the pulse air valve;

[0053] According to the formula V S= k (V0S0 + H0Z0), real-time adjustment of the fluid pump operation time S0 and the pulse air valve opening and closing times H0, where the value of k is greater than or equal to 1.2 and less than or equal to 2.0;

[0054] The milk froth volume Vs is discharged to the outside via a line of the beverage preparation device, wherein the line at least partially tapers in the direction of the milk froth flow.

[0055] In one embodiment, the beverage preparation device includes a liquid inlet temperature sensor and a steam heating device disposed upstream of the fluid pump, and the preparation method further includes:

[0056] Obtaining the desired milk foam temperature T2 and the inlet liquid temperature T measured by the inlet liquid temperature sensor;

[0057] The amount of steam released into the mixing chamber by the steam boiler per unit time is X1, and the time S2 for turning on the steam boiler is controlled according to the following parameters:

[0058] S2= k C (V0S0+ H0Z0)(T2- T1) / X, where C is the energy density of water vapor.

[0059] The technical solution provided by the present invention has the following advantages:

[0060] The present invention provides a mixing mechanism and a beverage dispensing device. The mixing mechanism includes a pipeline extending from an inlet end to an outlet end, wherein a flow channel is formed in the pipeline, and a gas-liquid mixed fluid is guided from the inlet end to the outlet end to form a foamy beverage. The cross-sectional dimension of the flow channel in the flow direction of the fluid at least partially decreases in the flow direction, and the flow velocity of the fluid slows down when it flows through the section of the flow channel that decreases, so that the gas and liquid in the fluid gradually mix to form a foamy beverage with stable quality. In the present invention, the mixing mechanism has a good foaming effect, and the pipeline has a large inner diameter, is not easy to clog, and is easy to clean, so that the beverage dispensing device is easy to clean and maintain, and can improve the quality of the beverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0062] FIG1 is a schematic diagram of a partial three-dimensional structure of an embodiment of a beverage dispensing device provided by the present invention;

[0063] FIG2 is a partial front view of the beverage brewing device in FIG1 ;

[0064] FIG3 is a cross-sectional view of the beverage dispensing device in FIG2 ;

[0065] FIG4 is an enlarged schematic diagram of point A in FIG3 ;

[0066] FIG5 is a schematic diagram showing the connection between the delivery pipe and the pipeline in FIG4 ;

[0067] FIG6 is a schematic diagram of the three-dimensional structure of the mixing mechanism in FIG1 ;

[0068] FIG7 is a schematic exploded perspective view of the three-dimensional structure of the mixing mechanism in FIG6 ;

[0069] FIG8 is a schematic diagram of the three-dimensional structure of the core body in FIG7;

[0070] FIG9 is a schematic diagram of the three-dimensional structure of a diversion section in FIG8 ;

[0071] FIG10 is a schematic diagram of the three-dimensional structure of the core in FIG9 from another viewing angle.

[0072] Description of reference numerals:

[0073] 1000-beverage mixing equipment; 100-mixing mechanism; 10-pipeline; 11-inlet end; 12-outlet end; 20-flow channel; 21-flow channel section; 211-flow channel space; 30-core; 31-guide plate; 311-front plate edge; 312-rear plate edge; 32-boss; 40-seal; 50-mounting plate; 60-channel; 61-mixing chamber; 62-liquid outlet temperature sensor; 200-delivery pipe; 201-through hole; 300-pulse air valve; 400-fluid pump; 500-three-way valve; L-outer contour line; R-rotation axis; S-normal plane of rotation axis. DETAILED DESCRIPTION

[0074] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0075] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0076] Please refer to Figures 1 to 4. The present invention provides a mixing mechanism 100 and a beverage dispensing device 1000 having the same. The mixing mechanism 100 is used to mix liquid beverage ingredients and air during the beverage preparation process to obtain a dense foamed beverage. The beverage dispensing device 1000 can be a foaming machine dedicated to beverage foaming, or it can be any product that extracts and brews food ingredients and has a foaming function to finally obtain a beverage. Specifically, the beverage dispensing device can be, but is not limited to, a coffee machine, a soymilk machine, a milk foam machine, etc. For ease of understanding, the following embodiments are all described by taking the beverage dispensing device as a coffee machine as an example. It can be understood that in other embodiments, according to the type of beverage dispensing device and the requirements of beverage preparation, the specific components of the gas and liquid mixed by the beverage dispensing device 1000 can be selected as needed.

[0077] Specifically, please continue to refer to Figures 3 to 10. In one embodiment, the beverage mixing device 1000 may include a body, a mixing mechanism 100 arranged on the body, and a fluid conveying mechanism. Among them, the body is a shell structure that carries the various components in the beverage mixing device, and it has a beverage outlet. The fluid conveying mechanism is used to transport milk and air into the mixing mechanism 100, so that the milk and air are fully fused in the mixing mechanism 100 to obtain milk foam. Specifically, the mixing mechanism 100 has an inlet end 11 and an outlet end 12. It should be noted that, in this embodiment, the inlet end 11 and the outlet end 12 are directional descriptions. The inlet end 11 refers to the area of ​​the mixing mechanism 100 that is relatively upstream of the fluid flow, and the outlet end 12 refers to the area of ​​the mixing mechanism that is relatively downstream of the fluid flow. The fluid delivery mechanism can preliminarily mix the milk and air before delivering the mixture to the inlet of the mixing mechanism 100 via the delivery tube 200. Alternatively, the same delivery tube 200 can be used to controllably deliver milk and air to the mixing mechanism 100, or separate delivery tubes can be used to deliver milk and air to the mixing mechanism 100. The milk foam formed by the mixing in the mixing mechanism 100 flows from the outlet 12 to the beverage outlet.

[0078] In this embodiment, the delivery mechanism includes a delivery tube 200, and also includes a fluid pump 400 and a pulse air valve 300 connected to the delivery tube 200. The fluid pump 400 is connected to the milk inlet to pump milk into the delivery tube 200, and the pulse air valve 300 is intermittently opened to simultaneously draw in external air while the fluid pump 400 draws milk, introducing air into the delivery tube 200. The delivery tube 200 then delivers the preliminarily mixed milk and air into the mixing mechanism 100. Optionally, in other embodiments, the delivery mechanism may further include an air pump that can automatically draw air to deliver air to the delivery tube 200.

[0079] Furthermore, the beverage dispensing device may also be provided with a heating device, which is located downstream of the mixing mechanism 100, that is, between the outlet end 12 and the beverage outlet, and preferably, is provided near the outlet end 12. The heating device may be provided in various forms such as a container with a built-in heating wire or a fluid heating pipe such as a thin film heater or a thick film heater. The present invention adopts a method in which the heating device is a steam boiler in a mixing chamber and a connection to the beverage dispensing device. When in operation, the steam boiler is preheated and pressurized so that steam can be transported through a pipeline to the mixing chamber to mix and heat the beverage flowing through it. The flow rate of the milk foam and / or the amount of steam entering can be controlled for the heating temperature to meet the required temperature standard of the beverage. A temperature sensor can be provided in the mixing chamber to detect the temperature after the steam and beverage are mixed.

[0080] Preferably, referring to Figures 1 and 2 , the beverage preparation device further includes a three-way valve 500 , which connects to the outlet of the mixing mechanism 100 and also connects to the beverage outlet and waste outlet, respectively. A heating device is disposed between the three-way valve 500 and the mixing mechanism 100 . During beverage preparation, the fluid pump 400 operates, directing milk from the milk inlet into the delivery pipe 200 . The pulse air valve 300 is intermittently opened as needed. The fluid pump 400 pumps air into the delivery pipe 200 under the suction action of the fluid pump 400 . The air and milk mixture then passes through the delivery pipe 200 and the mixing mechanism 100 , where it is fully mixed to produce milk froth. The milk froth is directed from the outlet of the mixing mechanism 100 through the three-way valve 500 to the beverage outlet. The heating device heats the milk froth flowing through it, ensuring that the temperature of the milk froth flowing out of the beverage outlet meets the required requirements. Preferably, temperature sensors are provided upstream of the fluid pump and downstream of the heating device to detect the real-time temperature of the fluid flowing therethrough, so that the heating device can accurately adjust its steam temperature and steam volume to achieve precise control of the beverage temperature.

[0081] It can be understood that in a preferred embodiment, the beverage delivery pipe 200 can also be connected to a cleaning solenoid valve, which can selectively connect clean water or cleaning liquid. When the equipment is started or each beverage is prepared, the cleaning solenoid valve is opened to connect clean water or cleaning liquid, and clean water or cleaning liquid is introduced into the delivery pipe 200 to flush the fluid pump 400, the delivery pipe 200, the mixing mechanism 100 and other piping systems. The flushing sewage can be selectively discharged through the waste outlet and / or the beverage outlet, wherein the waste outlet can be connected to the wastewater box and / or the waste residue box, or can be directly connected to the sewer pipe outside the equipment.

[0082] Preferably, the beverage mixing device 1000 further includes a control device that obtains parameters related to milk frothing in the beverage mixing device 1000 and is electrically connected to various functional components in the beverage mixing device 1000, such as the fluid pump 400, the pulse air valve, the heating device, etc., to receive and control and adjust the operating status of each functional component. The parameters related to milk frothing can be pre-set in the control system or indirectly generated by the control system based on relevant instructions or detection results.

[0083] According to the preset program of the control system, the beverage mixing device of the present invention can produce at least the following four beverages according to different needs: a. extracting a room temperature milk beverage from the milk tank; b. extracting a milk beverage from the milk tank and starting steam heating to obtain a heated milk beverage; c. extracting a milk beverage from the milk tank and mixing it with air to obtain a room temperature milk foam beverage of different thicknesses; d. extracting a milk beverage from the milk tank, mixing it with air, and then heating it with steam to obtain a heated milk foam beverage.

[0084] In one embodiment, the parameters related to milk froth production may include parameters related to milk froth temperature, such as a user-set beverage temperature or a beverage temperature automatically set based on beverage type identified by a control system. The control device is configured to obtain the milk froth temperature-related parameters and the detection results of the temperature sensor, and control the operation of the fluid pump, the pulse air valve, and the heating device based on the milk froth temperature-related parameters and the detection results of the temperature sensor. For example, the control device may adjust the speed of the fluid pump, the steam injection volume and steam temperature of the heating device, and the opening and closing logic of the pulse air valve, so that the temperature of the milk froth flowing out of the beverage outlet meets user requirements.

[0085] Optionally, the parameters related to milk froth production may include parameters related to milk froth thickness, such as a milk froth thickness set by the user, a beverage category automatically identified by the control system, etc. The control device is configured to obtain the parameters related to milk froth thickness and control the fluid pump and the pulse air valve based on the parameters related to milk froth thickness. For example, the control device may adjust the speed of the fluid pump, the on / off logic of the pulse air valve, and the opening ratio of the pulse air valve, so that the density of the milk froth flowing out of the beverage outlet meets user requirements.

[0086] It should be noted that in the above embodiment, the beverage category can be milk (whole fat, low fat or skim), coconut milk, oat milk, soy milk, almond milk, etc. Each type of beverage category has an impact on the thickness and temperature of the milk foam. By automatically identifying the beverage category through the control device and adjusting the control fluid pump, pulse air valve or heating device, etc., precise control of the taste of the beverage can be achieved, thereby improving the intelligence level of the equipment, improving the efficiency of beverage production and the stability of the quality of the finished product.

[0087] In one embodiment, referring to Figures 3 to 7 , the mixing mechanism 100 provided by the present invention includes a pipeline 10 having an inlet end 11 and an outlet end 12, and the pipeline 10 extends from the inlet end 11 to the outlet end 12. Specifically, the pipeline 10 can extend between the inlet end 11 and the outlet end 12 in a straight line, or in a curved or broken line shape. Preferably, the pipeline 10 extends approximately along an axis between the inlet end 11 and the outlet end 12 to facilitate the molding and internal cleaning of the pipeline 10. A flow channel 20 is formed within the pipeline 10, connecting the inlet end 11 and the outlet end 12. The flow channel 20 is used to supply a gas-liquid mixed fluid from the inlet end 11 to the outlet end 12.

[0088] Furthermore, the cross-sectional dimensions of the flow channel 20 in the direction of flow at least partially decrease in the direction of fluid flow, and the fluid's flow velocity slows as it flows through the decreasing sections of the flow channel. Specifically, the decreasing trend refers to the overall trend of the cross-sectional dimensions of the flow channel expanding and decreasing in the direction of fluid flow. It should be noted that this trend can be such that the cross-sectional dimensions consistently decrease at the same rate, decrease at different rates, or decrease in stages, meaning that the cross-sectional dimensions of each section may remain unchanged, or may partially increase and then decrease, while the cross-sectional dimensions of the subsequent section in the direction of flow remain smaller than those of the previous section. In this way, the fluid is compressed as it flows through the flow channel 20, allowing for thorough mixing of air and milk therein. It should be noted that the cross-sectional dimensions of the flow channel 20 can decrease in a stepped or gradual manner; can decrease entirely from the inlet end 11 to the outlet end 12, or can decrease locally between the inlet end 11 and the outlet end 12; can decrease entirely from the inlet end 11 to the outlet end 12, or can increase locally and then decrease while maintaining an overall decreasing trend. Preferably, the cross-sectional dimensions of the flow channel 20 gradually decrease from the inlet end 11 to the outlet end 12, so that the pressure of the gas-liquid mixture gradually changes and merges, achieving a good mixing effect while avoiding drastic pressure fluctuations, reducing turbulence, and improving the stability of the milk froth quality.

[0089] Preferably, the flow channel 20 extends in a tortuous direction within the pipeline 10 to change the flow direction of the fluid therein, thereby decelerating the gas-liquid mixture and extending its flow through the mixing mechanism 100. Specifically, the output end of the delivery tube 200 is connected to the inlet end 11 of the flow channel 20. The gas and / or liquid delivered by the delivery tube 200 enters the inlet end 11 of the flow channel 20, flows through the flow channel 20, and after thorough mixing, forms a foamed beverage and flows out from the outlet end 12.

[0090] Optionally, please refer to Figures 1 and 2 in combination. A mounting plate 50 may be provided on the outer peripheral side of the pipeline 10, and the mixing mechanism 100 is mounted on the body via the mounting plate 50. For example, it may be directly connected to the body or the flow channel 20, or it may be indirectly mounted on the body via other components such as a motor connected to the fluid pump 400. The connection method may be any convenient installation method such as screw connection or clip connection, so as to facilitate installation and disassembly and maintenance. The inlet end 11 is connected to the delivery pipe 200 via a quick connector, and the outlet end 12 is connected to the three-way valve 500 via a quick connector. In this way, the mixing mechanism 100 is installed in the body as a separate module, and the mixing mechanism 100 can be easily disassembled and assembled separately in the body. When the mixing mechanism 100 encounters abnormal conditions such as blockage and needs to be repaired, maintained or replaced, it can be operated very conveniently.

[0091] Optionally, when the pipeline 10 is installed inside the machine body, it is placed in a manner that extends substantially in the up-down direction, wherein the up-down direction can be roughly parallel to the direction of gravity, or have an angle of less than 80 degrees with the direction of gravity, and the inlet end 11 is located at the lower end of the pipeline 10, and the outlet end 12 is located above the inlet end 11. The fluid flows from bottom to top in the flow channel 20 in the direction against gravity. In this way, the fluid needs to overcome its own gravity to flow upward, avoiding the influence of the fluid gravity, which causes the fluid to flow through the pipeline 10 too quickly. In this way, through the posture of the pipeline 10, the anti-gravity is used to slow down the flow rate of the gas-liquid mixture in the mixing mechanism 100, thereby improving the mixing effect.

[0092] It should be noted that in this embodiment, the extension direction of the pipeline 10 refers to the direction in which the axis of the pipeline 10 extends from the inlet end 11 to the outlet end 13, while the flow direction of the fluid in the flow channel 20 refers to the direction in which the fluid flow path extends. As shown in Figure 4, in one embodiment, the pipeline 10 extends in a straight line (indicated by the solid arrow), while the flow direction is a spiral extension in the direction of the extension of the pipeline 10 (indicated by the dashed arrow). As the gas-liquid mixture flows along the flow channel 20 from the inlet end 11 to the outlet end 12, it further merges to form milk foam.

[0093] In an optional embodiment, the fluid flow rate at the output end is V, and the fluid flow rate at the outlet end 12 is V2, where V2 is less than or equal to 0.5V (0.5 times V). In other words, the shape of the flow channel 20 reduces the flow rate of the gas-liquid mixture passing therethrough by at least half. This not only prolongs the time the gas-liquid mixture spends passing through the flow channel 20, enhancing its mixing effect, but also reduces the fluid flow rate, increases the pressure, and improves the foaming effect. It should be noted that in this embodiment, the fluid deceleration effect of the mixing mechanism 100 is lower than that of a conventional flow restrictor. The fluid flow rate is greater than that of the flow restrictor, making it less likely for milk to accumulate and clog the flow channel, facilitating maintenance.

[0094] In one embodiment, the inner diameter of the delivery tube 200 at the output end is less than or equal to the minimum inner diameter of the pipeline 10. This reduces the flow rate and increases the pressure of the fluid flowing from the delivery tube 200 into the inlet end 11 of the flow channel 20 due to the increased cross-sectional area. Furthermore, the inner diameter of the pipeline 10 is configured to be larger than the inner diameter of the delivery tube 200, making the interior of the pipeline 10 easier to clean and less prone to clogging.

[0095] Optionally, the delivery tube 200 has an inner diameter r at the output end, and an inner diameter r1 at the inlet end 11, where r1 is greater than 2r (twice r). In this manner, the cross-sectional variation from the output end of the delivery tube 200 to the inlet end 11 of the flow channel 20 is utilized to regulate the flow rate of the fluid entering the flow channel 20, thereby slowing the flow rate and increasing the pressure of the fluid entering the flow channel 20. The large inner diameter of the pipeline 10 makes it less susceptible to clogging and easier to clean and maintain. It should be noted that in this embodiment, the inner diameter of the pipeline 10 is much larger than that of a typical flow restrictor, making it less susceptible to clogging.

[0096] Furthermore, referring to FIG3 , the flow channel 20 includes a plurality of flow channel segments 21 that are sequentially adjacent and interconnected along the extension direction of the pipeline 10. The flow directions of two adjacent flow channel segments 21 along the extension direction of the pipeline 10 are different. This deceleration of the fluid is achieved by changing its flow direction, extending the time it takes to pass through the flow channel 20 and achieving more complete fusion.

[0097] In one embodiment, referring to Figure 4 , along the extension direction of the pipeline 10, the maximum cross-sectional dimensions of at least some of the multiple flow channel segments 21 decrease in sequence. This allows the gas-liquid mixture to flow through each flow channel segment 21 while switching directions and flowing into a smaller space. This reduces the flow rate while increasing the pressure, and as it is compressed in the smaller space, the pressure gradually changes, gradually mixing the milk and air, achieving a good fusion effect and producing milk froth of stable quality. Furthermore, preferably, within each flow channel segment 21, the cross-sectional dimensions of the upstream portion of the flow channel segment 21 are larger than those of the downstream portion. This allows the pressure of the gas-liquid mixture to gradually change within each flow channel segment 21, reducing the generation of turbulence.

[0098] In another embodiment, the cross-sectional dimensions of each flow channel segment 21 vary in sections along the flow direction, with the cross-sectional dimensions at the front end of the flow channel segment being larger than those at the rear end. In other words, the cross-sectional dimensions may first increase and then decrease, or first decrease, then increase, and then decrease again. Alternatively, preferably, the cross-sectional dimensions of the multiple flow channel segments 21 decrease in a step-like manner. This variation in cross-sectional dimensions results in a segmented change in the flow velocity of the fluid, further consuming the fluid's kinetic energy in each flow channel segment 21, extending the time the gas-liquid mixture flows through the mixing mechanism 100, and achieving a better gas-liquid mixing effect.

[0099] Based on the above embodiment, optionally, referring to FIG. 4 , the inner diameter of the inlet end 11 is r1, the inner diameter of the outlet end 12 is r2, and the ratio of r1 to twice r2 is greater than 1 and less than or equal to 3. In this way, compression of the gas-liquid mixture is achieved, achieving a better mixing effect while avoiding drastic changes in the cross-sectional dimensions of the pipeline 10 and an overly small pipeline 10 size. The pipeline 10 is not easily clogged and is easy to clean.

[0100] Optionally, the fluid pressure at the inlet end 11 is P1, the fluid pressure at the outlet end 12 is P2, and the ratio of P2 to P1 is greater than or equal to 1.5 and less than or equal to 4. In this embodiment, the fluid pressure at the outlet end 12 is relatively larger than the pressure at the inlet end 11, while the fluid pressure does not change dramatically, thereby reducing turbulence and ensuring a better and more stable milk froth product.

[0101] Optionally, the fluid flow velocity at the inlet end 11 is V1, the fluid flow velocity at the outlet end 12 is V2, and the ratio of V1 to V2 is greater than or equal to 2. In this embodiment, the kinetic energy of the fluid is absorbed by the segmented change of the flow direction of the flow channel 20, so that the flow velocity of the fluid is slowed down and the pressure is increased during the flow through the flow channel 20, thereby extending the time for the gas-liquid mixture to flow through the mixing mechanism 100, thereby increasing the pressure of the fluid and improving the gas-liquid mixing effect.

[0102] The flow channel segments 21 can alter the flow direction in a variety of ways. For example, each flow channel segment 21 extends radially along the pipeline 10 and flows back and forth in a zigzag pattern. In a preferred embodiment, referring to FIG4 , each flow channel segment 21 is arranged in a spiral shape, rotating about a rotation axis R, with the axis R extending in the same direction as the pipeline 10. In this embodiment, the spiral shape of the flow channel segments 21 rotating about the rotation axis R allows the flow direction to change gradually along the pipeline 10. This change in flow direction also creates a smoother overall shape for the flow channel 20, reducing turbulence caused by drastic changes in flow direction, eliminating blind spots, and facilitating cleaning while ensuring high-quality milk froth and stable foaming.

[0103] Optionally, among the multiple flow channel segments 21, two adjacent flow channel segments 21 in the direction of extension of the pipeline 10 rotate in opposite directions. For example, the preceding flow channel segment 21 in the direction of extension of the pipeline 10 rotates clockwise around the rotation axis R, while the adjacent subsequent flow channel segment 21 rotates counterclockwise around the rotation axis R. In this manner, the shape and configuration of the multiple flow channel segments 21 achieve repeated reversal of the fluid therein, thereby reducing the loss of kinetic energy of the fluid, achieving a better deceleration effect on the fluid, increasing the time the gas-liquid mixture spends flowing through the mixing mechanism 100, improving the mixing effect, and producing a better milk froth product.

[0104] Based on the above embodiment, the flow channel 20 can have various shapes and configurations. In one embodiment, a protrusion is provided on the inner periphery of the pipe 10, and the protrusion defines and forms the flow channel 20. In this embodiment, the mixing mechanism 100 is a single body structure, which is easy to assemble.

[0105] Furthermore, a channel 60 is connected between the outlet end 12 of the mixing mechanism 100 and the mixing chamber 61 of the heating device, wherein the inner diameter r3 of the channel 60 is smaller than the minimum inner diameter r2 of the mixing mechanism 100, and the inner diameter r4 of the mixing chamber is larger than the maximum inner diameter r1 of the mixing mechanism. When the mixed beverage passes through the channel and enters the mixing chamber, it is squeezed and sprayed into the mixing chamber, and the steam introduced from the boiler into the mixing chamber is mixed more evenly with the sprayed beverage.

[0106] In another embodiment, referring to Figures 4 to 10 , the mixing mechanism 100 further includes a core 30 inserted into the pipe 10, with the core 30 and the inner periphery of the pipe 10 defining the flow channel 20. The core 30 can be integrally formed or removably inserted into the pipe 10. Thus, the helical flow channel formed by the separate core 30 and the pipe 10 is easily formed and reduces production costs.

[0107] Preferably, the core 30 is detachably inserted into the pipe 10. In this way, the core 30, which has a tortuous and complex structure, can be disassembled for cleaning, and the mixing mechanism 100 can be cleaned more thoroughly. Even after long-term use, the milk stains remaining in the flow channel 20 will not accumulate and contaminate the entire flow system, thereby improving the maintainability of the beverage brewing device 1000 and the beverage brewing device and extending its service life.

[0108] Preferably, the pipeline 10 has an opening at the inlet end 11, and the core is detachably inserted into the pipeline 10 from the opening. The opening is located on the path in the extension direction of the flow channel 20, and the mixing mechanism also includes a seal for sealing the opening.

[0109] Specifically, the pipeline 20 has an opening extending downwardly through the inlet end 11, and the core 30 is detachably inserted into the pipeline 10 from the opening. Preferably, the core 30 is inserted upwardly from the bottom of the pipeline 10. The opening of the pipeline 10 can be sealed with a sealant, which can be integral with the core 30 or separate from the core 30. When the interior of the pipeline 10 needs to be inspected and cleaned, the sealant can be removed and the interior of the pipeline 10 can be cleaned. The operation is simple, and the waste liquid from the cleaning flows directly out of the opening without remaining in the pipeline.

[0110] Preferably, refer to Figure 5, which illustrates the connection between the pipeline 10 and the delivery tube 200. The arrows in the figure indicate the flow direction of the fluid flowing into the flow channel 20 in the delivery tube 200. As shown in the figure, a through hole 201 is formed around the periphery of the pipeline 10, through which the delivery tube 200 passes. The through hole 201 is located relatively close to the inlet end 11 and is used to introduce fluid into the flow channel 20. The through hole 201 connects to the flow channel 20, and the fluid is injected into the pipeline 10 from the end of the core 30. Preferably, the delivery tube 200 is arranged at a 90-degree angle to the pipeline 10, so that the fluid is radially injected into the flow channel 20 and passes upward through the core 30. This arrangement of the delivery tube 200 and the pipeline 10 achieves a deflection in the flow direction of the incoming fluid. This deflection causes the fluid, just entering the flow channel 20, to impact the internal structure of the pipeline 10, rapidly dissipating its kinetic energy and slowing its flow rate. The fluid then passes upward through the core 30, achieving a thorough fusion of the milk and air. Preferably, when the seal is installed in the flow channel 20 , its highest point does not exceed the highest point of the inner diameter height of the delivery pipe 200 , so as to avoid preventing the fluid from flowing smoothly into the flow channel 20 .

[0111] Preferably, the through hole 201 is opened on the peripheral side of the pipeline 10, and the opening is set on the end side of the flow channel 20, and the setting positions of the two are distributed at an angle. The delivery pipe 200 and the pipeline 10 do not affect the disassembly and assembly of the core 30, and at the same time make the mixing mechanism 100 compact and reasonable.

[0112] Further, please refer to Figures 4 and 8. A protrusion 32 is provided at one end of the core 30 close to the seal, and the protrusion 32 is arranged in the flow direction of the fluid introduced by the channel 201. In this way, when the fluid flows into the flow channel 20 from the delivery pipe 200, it first contacts the protrusion 32 horizontally, and then bends and flows along the flow channel 20. On the one hand, it is convenient to hold the core 30 for plugging and unplugging, and on the other hand, the fluid injected from the delivery pipe 200 is divided and buffered by the protrusion 32, further consuming its kinetic energy, so that the fluid flow rate is rapidly reduced. In this way, after the fluid collides with the protrusion 32 and slows down, it enters the smaller flow channel 20 and squeezes upward to achieve sufficient mixing of gas and liquid. Preferably, the height of the protrusion 32 is greater than the inner diameter r of the delivery pipe 200 arranged horizontally, so as to fully buffer and divide the introduced fluid.

[0113] Preferably, an elastic device is provided around the outer periphery of the boss 32, and the elastic device is fixed between the core 30 and the seal. In this way, the elastic device can buffer the impact force of the fluid, further reducing the flow rate of the fluid and preventing the boss from being worn after being impacted for a long time.

[0114] Furthermore, a flexible sealing strip is provided between the outer periphery of the core 30 and the inner periphery of the pipe 10 to construct a flow channel 20 with better sealing performance, guiding the gas-liquid mixture to flow in the flow channel 20 in a predetermined direction, and preventing flow channel short circuits from affecting the milk froth generation effect.

[0115] Based on the above embodiment, referring to Figures 4 and 7 , the pipe 10 can be configured as a curved shape, while the core 30 is configured as a flexible structure to facilitate installation and removal. Preferably, the pipe 10 is configured as a straight shape, while the core 30 can also be configured as a rigid structure to not affect assembly and removal, while also preventing the flow channel 20 from deformation and aging.

[0116] Further, referring to Figures 4 and 7 to 10, the core 30 includes a plurality of guide plates 31 arranged in sequence along the extension direction of the pipeline 10. Each guide plate 31 is arranged in a spiral shape that rotates about the rotation axis R. The rotation directions of each adjacent guide plate 31 in the extension direction of the pipeline 10 are opposite, so that a flow channel section 21 is defined between each guide plate 31 and the inner periphery of the pipeline 10. In this embodiment, the inner periphery of the pipeline 10 is constructed as a smooth structure, and the core 30 is configured to form a spiral shape to form the spiral flow channel 20. After the core 30 is removed, it can be flushed and thoroughly cleaned, and the interior of the pipeline 10 has a smooth shape that is easy to clean.

[0117] Furthermore, referring to Figures 8 to 10 , each guide plate 31 extends radially from the rotation axis R toward the inner circumference of the pipeline 10, so that each section of the guide plate 31 forms two separate flow passage spaces 211 radially between the inner circumference of the pipeline 10 and its two sides. These two flow passage spaces 211 together constitute a flow passage segment 21. This increases the flow rate of the flow passage 20. Furthermore, the guide plates 31 and flow passage 20 have an axisymmetric structure, resulting in a more uniform pressure distribution within each flow passage segment 21. Furthermore, the core 30 has good rigidity and is less susceptible to deformation over time.

[0118] Optionally, the rear edge 312 of each guide plate 31 in the flow direction is rotated about the rotation axis R by a specific angle relative to the front edge 311. Optionally, the specific angle is greater than 350 degrees and less than 370 degrees, and preferably, is 360 degrees. In other words, the fluid flowing through each flow channel segment 21 makes a complete turn, thereby extending the flow path of the gas-liquid mixture in the pipeline 10 as much as possible and promoting the thorough fusion of milk and air.

[0119] Please refer to Figure 10. Optionally, in the normal plane S to the rotation axis R, the front edge 311 of the guide plate 31 in the latter section intersects with the rear edge 312 of the guide plate 31 in the former section at a specific angle a. As shown in the figure, there are multiple normal planes to the rotation axis R. The normal plane is selected at the intersection of the front edge 311 of the guide plate 31 in the latter section and the rear edge 312 of the guide plate 31 in the former section, and the angle a between the two edges is measured. In this embodiment, the fluid is divided and buffered by the edges of the guide plate 31 between the two guide sections, while the flow rotation direction is changed. While achieving a good energy dissipation and deceleration effect, this structural design reduces dead angles in the core 30 structure, making the core 30 structure easy to clean and having a large flow rate. Preferably, the specific angle a is greater than 80 degrees and less than 100 degrees. It is best that the specific angle a is approximately 90 degrees, that is, the front end plate edge 311 of the guide plate 31 in the latter section is basically perpendicular to the rear end plate edge 312 of the guide plate 31 in the former section. In this way, the guide plate 31 has a shape that is easier to form, has fewer cleaning dead corners, and is easy to clean and form.

[0120] In an optional embodiment, the inner diameter of the pipe 10 gradually decreases along its extension, and the outer diameter of the core 30 also decreases along its extension. This, combined with the pipe 10's decreasing inner circumference along its extension, creates a flow channel 20 with a gradually decreasing cross-sectional size. This allows the milk and gas in the gas-liquid mixture to fully blend, achieving excellent milk foam formation. Furthermore, the core 30 can be easily removed from the inlet end 11 for cleaning, improving the user's cleaning experience.

[0121] In one embodiment, referring to FIG. 8 , the core 30 extends along the rotation axis R, and the angle b between the connecting line L of its outer contour (i.e., the connecting line at its radially outermost end) and the rotation axis R is greater than 0 degrees and less than or equal to 10 degrees. Within this value range, the core 30 has a relatively smoothly varying structure, achieving gradual squeezing of the fluid, fully blending the milk and air, forming milk froth of stable quality, and reducing the occurrence of milk froth residue due to slow flow rate.

[0122] In the present invention, an inlet temperature sensor is provided upstream of the fluid pump 400 for detecting the initial temperature of the extracted beverage, and an outlet temperature sensor 62 is provided in the mixing chamber for detecting the temperature of the beverage after being heated by the heating device. The outlet temperature sensor 62 in the mixing chamber is located close to the outlet of the mixing chamber.

[0123] The present invention also provides a beverage preparation method, which prepares beverages according to beverage parameters preset in a beverage preparation device or manually input by the beverage preparation device, the parameters including but not limited to: milk foam volume V S , cup volume, liquid outlet temperature T2, etc., where the parameters of the cup volume of the beverage are determined by the speed V0 and operation time S0 of the fluid pump, and the thickness of the milk foam is determined by the opening and closing times H0 of the pulse air valve and the air intake Z0.

[0124] Among them, the milk foam volume V S = k (V0S0 + H0Z0); k is a parameter related to milk foam volume, typically set between 1.2 and 2.0. A larger k coefficient produces more milk foam and a fluffier texture, while a smaller k coefficient produces less foam and a smoother texture. During the preparation process, the operating time S0 of the fluid pump 400 and the number of openings and closings H0 of the pulse air valve are adjusted in real time based on the above formula and parameter relationship.

[0125] Furthermore, the liquid inlet temperature measured by the liquid inlet temperature sensor is T1, the preset or actively set liquid outlet temperature is T2, the amount of steam required to raise the beverage temperature from T1 to T2 is X0, the amount of steam released into the mixing chamber by the steam boiler per unit time is X1, and the time the steam boiler is turned on is S2;

[0126] Where, S2 = X0 / X1;

[0127] Through the data, it is deduced that X0=V S C(T2- T1), where C is the energy density of water vapor, typically 2260 kJ / kg;

[0128] The formula between the various parameters is: S2= k C (V0S0+ H0Z0) (T2- T1) / X1.

[0129] Furthermore, the liquid outlet sensor detects the temperature of the beverage in the mixing chamber in real time. When the temperature reaches the liquid outlet temperature T2, the steam input is actively shut off to prevent the beverage temperature from being too high.

[0130] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, those skilled in the art may make other different forms of changes or modifications without making any creative work, and all of these should fall within the scope of protection of the present invention.

Claims

1. A hybrid mechanism, characterized in that, Comprising: A pipeline, having an inlet end and an outlet end, the pipeline extending from the inlet end to the outlet end, a flow path channel communicating the inlet end and the outlet end being formed in the pipeline, the cross-sectional dimension of the flow path channel in the flow direction of the fluid at least partially showing a decreasing trend in the flow direction, and the flow velocity of the fluid slowing down when flowing through the section of the flow path channel with a decreasing trend.

2. The mixing mechanism according to claim 1, wherein The flow path channel includes a plurality of flow channel segments communicating with each other in the pipeline extension direction, and the flow directions of every two adjacent flow channel segments are different.

3. The mixing mechanism according to claim 2, characterized in that, In the pipeline extension direction, the maximum cross-sectional dimensions of the plurality of flow channel segments decrease in sequence.

4. The mixing mechanism according to claim 3, wherein In each flow channel segment, the cross-sectional dimension of the flow channel segment gradually decreases along the flow direction; or, In each flow channel segment, the cross-sectional dimension of the flow channel segment changes in sections along the flow direction, and the cross-sectional dimension of the upstream of the flow channel segment in the flow direction is larger than that of its downstream; or, The cross-sectional dimensions of the plurality of flow channel segments gradually decrease in a stepped trend.

5. The mixing mechanism according to claim 1, characterized in that The inner diameter of the inlet end is r1, the inner diameter of the outlet end is r2, the ratio of r1 to 2r2 is greater than 1 and less than or equal to 3; and / or, The fluid pressure at the inlet end is P1, the fluid pressure at the outlet end is P2, the ratio of P2 to P1 is greater than or equal to 1.5 and less than or equal to 4; and / or, The fluid flow velocity at the inlet end is V1, the flow velocity at the outlet end is V2, the ratio of V1 to V2 is greater than or equal to 2.

6. The mixing mechanism according to any one of claims 2 to 4, characterized in that, Each flow channel segment is arranged in a spiral shape rotating around a rotation axis, and the extension direction of the rotation axis is the same as the pipeline extension direction; and / or, Among the plurality of flow channel segments, the rotation directions of every two adjacent flow channel segments in the pipeline extension direction are opposite.

7. The mixing mechanism according to claim 1, wherein The mixing mechanism further includes a core body inserted into the pipeline, and the flow path channel is defined between the core body and the inner wall of the pipeline, wherein the core body can be integrally formed or detachably inserted into the pipeline.

8. The mixing mechanism according to claim 7, characterized in that The core body includes a plurality of guide plates arranged in sequence along the pipeline extension direction, each guide plate being arranged in a rotating spiral shape, and the rotation directions of every two adjacent guide plates in the pipeline extension direction are opposite.

9. The mixing mechanism according to claim 8, wherein Each guide plate extends radially towards the wall of the pipeline, so that two mutually separated flow channel spaces are respectively formed between both sides of each guide plate and the wall of the pipeline.

10. The mixing mechanism according to claim 8, wherein, The flow path channel is provided with a rotation axis, and the rear end plate edge of each guide plate rotates a specific angle around the rotation axis compared with its front end plate edge in the flow direction.

11. The mixing mechanism according to claim 10, characterized in that, The specific angle is greater than 350 degrees and less than 370 degrees.

12. The mixing mechanism according to claim 10, wherein In the normal plane of the rotation axis, the front end plate edge of the rear guide plate intersects with the rear end plate edge of the front guide plate at a specific angle.

13. The mixing mechanism according to claim 12, wherein The specific angle is greater than 80 degrees and less than 100 degrees.

14. The mixing mechanism according to any one of claims 7 to 13, characterized in that The inner diameter of the pipeline gradually decreases along the pipeline extension direction, and the outer diameter of the core body gradually decreases along the pipeline extension direction.

15. The mixing mechanism according to claim 10, wherein, The angle b between the outer contour line of the core body in the axial direction and the rotation axis is greater than 0 degree and less than or equal to 10 degrees.

16. The mixing mechanism according to claim 7, characterized in that, The pipeline is provided with an open end at the inlet end, the core body is detachably inserted into the pipeline from the open end, the open end is located on the path of the extending direction of the flow path channel, and the mixing mechanism further includes a seal for sealing the open end.

17. The mixing mechanism according to claim 16, wherein The pipeline extends along the vertical direction of gravity, the inlet end is located at the lower end of the pipeline, and the core body is inserted into the pipeline from bottom to top through the open end.

18. The mixing mechanism according to claim 16, wherein, A convex column extending towards the seal is arranged on the core body, and the convex column is arranged on the flow path of the fluid introduced by the flow path channel.

19. The mixing mechanism according to claim 1, characterized in that, A through hole is formed on the circumferential side of the pipeline, the through hole is relatively close to the inlet end and is used for introducing fluid into the flow path channel.

20. The mixing mechanism according to claim 1, characterized in that, A convex structure is protruded on the inner circumference of the pipeline, and the convex structure defines and forms the flow path channel.

21. A beverage brewing device, characterized in that, Including: A machine body having a beverage outlet; A mixing mechanism arranged on the machine body, the mixing mechanism includes a pipeline, the pipeline has an inlet end and an outlet end, the pipeline extends from the inlet end to the outlet end, a flow path channel communicating the inlet end and the outlet end is formed in the pipeline, the cross-sectional dimension of the flow path channel shows a decreasing trend in the flowing direction of the fluid, wherein the flow path channel includes a plurality of flow channel segments that are adjacent to each other and communicate with each other in the extending direction of the pipeline, and the flowing directions of every two adjacent flow channel segments are different, a through hole relatively close to the inlet end is formed on the pipeline, and the outlet end communicates with the beverage outlet; and, A delivery pipe, the output end of the delivery pipe communicates with the flow path channel through the through hole.

22. The beverage brewing device according to claim 21, wherein, The fluid flow rate at the output end is V, the fluid flow rate at the outlet end is V2, and V2 is less than or equal to 0.5V (0.5 times of V); and / or, The inner diameter of the delivery pipe at the output end is less than or equal to the minimum inner diameter of the pipeline; and / or, The inner diameter of the delivery pipe at the output end is r, the inner diameter of the inlet end is r1, and r1 is greater than 2r.

23. The beverage brewing device according to claim 22, wherein The beverage brewing device further includes a fluid pump, a pulse air valve and a heating device, the fluid pump is used for pumping fluid into the delivery pipe, the pulse air valve is used for opening and closing intermittently, and the heating device is arranged downstream of the outlet end.

24. The beverage brewing device according to claim 23, characterized in that, Temperature sensors are respectively arranged upstream of the fluid pump and downstream of the heating device, the beverage brewing device further includes a control device, the control device is electrically connected to the temperature sensors, the fluid pump, the pulse air valve and the heating device, and the control device is used for obtaining the parameters related to the milk foam temperature and the detection results of the temperature sensors, so as to control the fluid pump, the pulse air valve and the heating device to work according to the parameters related to the milk foam temperature and the detection results of the temperature sensors.

25. The beverage brewing device according to claim 23, characterized in that, The beverage brewing device further includes a control device, the control device is electrically connected to the fluid pump and the pulse air valve, and is used for obtaining the parameters related to the thickness of the beverage milk foam, and the control device controls the fluid pump and the pulse air valve to work according to the parameters related to the milk foam thickness.

26. The beverage brewing device according to claim 21, wherein, An installation plate is provided on the outer peripheral side of the pipeline. The mixing mechanism is installed on the machine body through the installation plate. The outlet end is connected to a three-way valve through a quick connector, and the three-way valve is respectively communicated with the beverage outlet and the waste discharge port.

27. A beverage brewing device, characterized in that, Including: A mixing mechanism, including a pipeline arranged in the vertical direction. The pipeline includes an inlet end at the lower end and an outlet end at the upper end. A flow path channel is formed between the inlet end and the outlet end, and the fluid flows upward from the lower end to the upper end in the direction opposite to the gravity direction through the flow path channel. The pipeline is provided with a through hole relatively close to the inlet end; and; A delivery pipe, arranged horizontally relative to the direction of the pipeline, and communicated with the flow path channel through the through hole. The delivery pipe forms an angle with the flow path channel; Wherein, the lateral cross-sectional dimension of the flow path channel shows a decreasing trend in the flow direction of the fluid.

28. The beverage brewing device according to claim 27, wherein, An open mouth penetrating downward is provided at the inlet end of the mixing mechanism. A core body that can be inserted and pulled out of the pipeline from the open mouth and a seal for shielding the open mouth are provided.

29. The beverage brewing device according to claim 28, characterized in that, A convex column protruding downward is provided at the lower end of the core body. The convex column is located in the flow path channel, and the height of the convex column is greater than the inner diameter of the horizontally arranged delivery pipe.

30. The beverage brewing device according to claim 29, wherein, When the fluid flows into the flow path channel from the delivery pipe, it first contacts the convex column horizontally and then bends and flows along the flow path channel.

31. The beverage brewing device according to claim 28, characterized in that, When the seal is installed in the flow path channel, the highest point does not exceed the highest point of the inner diameter height of the delivery pipe.

32. The beverage brewing device according to claim 29, characterized in that, An elastic device is sleeved on the outer periphery of the convex column, and the elastic device is fixed between the core body and the seal.

33. The beverage brewing device according to claim 27, characterized in that, The delivery pipe and the pipeline are arranged at a 90-degree angle.

34. A method for preparing a beverage, characterized in that, Prepare the beverage according to the parameters of the beverage preset in the beverage brewing device or manually input by the beverage brewing device. The preparation method includes: Obtain the volume Vs of the milk foam to be prepared and the rotation speed V of the fluid pump set in the brewing device 0、 and the air intake volume Z0 for each single opening and closing of the pulsed air valve; According to the formula V S = k (V0S0 + H0Z0), adjust the running time S0 of the fluid pump and the opening and closing times H of the pulsed air valve in real time 0， wherein, the value of k is greater than or equal to 1.2 and less than or equal to 2.0; The volume of the milk foam Vs is discharged outward through the pipeline of the beverage brewing device, wherein the pipeline shows a decreasing trend at least partially in the flow direction of the milk foam.

35. The preparation method of the beverage according to claim 34, characterized in that, The beverage brewing device includes an inlet temperature sensor arranged upstream of the fluid pump and a heating device using steam. The preparation method further includes: Obtain the required milk foam temperature T2 and the inlet temperature T measured by the inlet temperature sensor; The amount of steam released into the mixing cavity by the steam boiler per unit time is X1. Control the time S2 for turning on the steam boiler according to the following parameters: S2 = k C (V0S0 + H0Z0) (T2 - T1) / X, where C is the energy density of water vapor.

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