Coffee extraction tea making structure and coffee machine

Abstract

The utility model relates to the technical field of coffee machines, and provides a coffee extraction and tea making structure and a coffee machine.The coffee extraction and tea making structure comprises a device body, a brewing extraction cavity is formed in the device body, and the brewing extraction cavity is provided with an upper liquid passing opening and a lower liquid passing opening; a connector A of the first three-way valve is connected with the lower liquid passing opening, a connector B is connected with a hot water source, a connector C is connected with the tea outlet, and the first three-way valve is used for switching communication between the connector A and the connector B or communication between the connector A and the connector C; a connector A1 of the second three-way valve is connected with the upper liquid passing opening, a connector B1 is connected with the hot water source, a connector C1 is connected with the coffee outlet, and the second three-way valve is used for switching communication of the connector A1 and the connector B1 or communication of the connector A1 and the connector C1. Through the technical scheme, the technical problem that in the prior art, coffee extraction equipment cannot be used for making tea is solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of coffee machine technology, specifically to a coffee extraction and tea brewing structure and a coffee machine. Background Technology

[0002] In the beverage preparation equipment sector, coffee machines and tea brewing equipment exhibit significant functional differentiation. Existing coffee extraction equipment typically employs methods such as high-pressure steam extraction and drip extraction, with their structural designs tailored to the characteristics of coffee powder. However, these devices generally suffer from technical bottlenecks that fail to meet the needs of tea brewing: firstly, tea brewing requires precise control of water temperature and pressure, while existing coffee machines often employ fixed temperature and pressure controls, making it difficult to satisfy the sensitivity of tea to these factors; secondly, tea extraction requires different water flow patterns and extraction times, while the linear water flow path and fixed extraction duration of coffee machines cannot achieve a balanced release of components such as tea polyphenols and amino acids from tea leaves. Meanwhile, while traditional tea brewing equipment can meet the requirements for water temperature control and immersion extraction, it lacks coffee extraction capabilities, leading consumers to purchase multiple sets of equipment, which occupies kitchen space and increases operating costs. Utility Model Content

[0003] To overcome the above-mentioned defects, embodiments of this utility model provide a coffee extraction and tea brewing structure and a coffee machine, which solves the technical problem that existing coffee extraction equipment cannot be used for tea brewing.

[0004] According to one aspect, at least one embodiment of the present invention provides a coffee extraction and tea brewing structure, comprising:

[0005] The main body of the device has a brewing and extraction chamber inside. The upper end of the brewing and extraction chamber is provided with an upper liquid outlet, and the lower end is provided with a lower liquid outlet, which is used to hold coffee powder or tea powder.

[0006] The first three-way valve has an A port, a B port and a C port. The A port is connected to the lower liquid outlet, the B port is connected to the hot water source, and the C port is connected to the tea outlet. The first three-way valve is configured to switch the connection state, which is used to switch the connection between the A port and the B port or between the A port and the C port.

[0007] The second three-way valve has an A1 port, a B1 port, and a C1 port. The A1 port is connected to the upper liquid inlet, the B1 port is connected to the hot water source, and the C1 port is connected to the coffee outlet. The second three-way valve is configured to switch the connection state, which is used to switch the connection between the A1 port and the B1 port or between the A1 port and the C1 port.

[0008] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, the brewing and extraction chamber extends vertically, and two vertically sliding pistons are respectively provided at the upper and lower ends of the brewing and extraction chamber. The upper liquid inlet is connected to the brewing and extraction chamber through the upper piston, and the lower liquid inlet is connected to the brewing and extraction chamber through the lower piston. The two pistons are used to adjust the volume of the brewing and extraction chamber after sliding.

[0009] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, each of the two pistons is provided with a liquid-passing mesh on the side facing the brewing and extraction chamber, and a liquid distribution space is formed between the liquid-passing mesh and the piston. The upper liquid-passing port and the lower liquid-passing port are respectively connected to the brewing and extraction chamber through the two liquid distribution spaces.

[0010] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, each of the two pistons has an installation groove on the side facing the brewing and extraction chamber, and the liquid filter is detachably installed in the installation groove.

[0011] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, the diameter of the liquid-passing mesh is larger than the diameter of the mounting groove, so that the side wall of the liquid-passing mesh and the inner wall of the mounting groove form an interference fit.

[0012] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, the piston further has a plurality of diffusing protrusions located in the liquid distribution space, and the plurality of diffusing protrusions divide the liquid distribution space into a plurality of diffusing regions.

[0013] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, a plurality of the diffuser protrusions are uniformly distributed radially along the liquid distribution space.

[0014] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, the liquid-passing mesh is connected to the bottom wall of the mounting groove by a bolt located at the center.

[0015] For example, in a coffee extraction and tea brewing structure provided in at least one embodiment of the present invention, a funnel-shaped liquid passage hole is provided on the liquid passage mesh, and the diameter of the liquid passage hole gradually increases from the brewing and extraction chamber side to the piston side.

[0016] According to another aspect, at least one embodiment of the present invention also provides a coffee machine, including a coffee extraction and tea brewing structure.

[0017] The beneficial effects of the embodiments of this utility model are as follows:

[0018] In this invention, the brewing and extraction chamber achieves bidirectional switching between the inlet and outlet through the linkage of the first three-way valve and the second three-way valve: when extracting coffee, a "bottom in, top out" path is adopted, and the high-pressure environment established in the coffee outlet pipeline by the pressure adjustment effect brought by the control system meets the high-pressure penetration extraction conditions required for coffee powder extraction, ensuring that caffeine, oils and other components are fully extracted; when brewing tea powder, a "top in, bottom out" path is adopted, and the gravity osmosis under normal pressure is used to release the tea polyphenols, amino acids and other components in the tea leaves according to different solubility gradients, avoiding component imbalance caused by high pressure.

[0019] The two-way valve design integrates the fluid paths for coffee extraction and tea brewing into the same brewing chamber. Through valve on / off combinations (four connection states, only two effective states are used), it avoids the drawbacks of traditional equipment requiring separate coffee extraction and tea brewing units, reducing redundant configuration of heating modules and piping systems. The intervention of the pressure control system precisely controls the pressure parameters during coffee extraction. Its collaborative work with the three-way valve allows the same chamber to exhibit different fluid dynamic characteristics in two modes (high pressure and normal pressure), solving the technical bottleneck mentioned in the background that "coffee extraction equipment cannot be used for tea brewing." Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a coffee machine according to one embodiment of the present invention;

[0022] Figure 2 This is a pipeline connection diagram of a coffee extraction and tea brewing structure in another embodiment of the present invention;

[0023] Figure 3 for Figure 1 A schematic diagram of the internal structure of a coffee machine in one embodiment;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 for Figure 2 A schematic diagram of the piston and liquid-passing mesh in a coffee extraction and tea brewing structure is shown in one embodiment.

[0026] Figure 6 for Figure 2 A schematic diagram of the internal structure of the piston and liquid-passing mesh in a coffee extraction and tea brewing structure in one embodiment;

[0027] Figure 7 for Figure 6 Enlarged view at point B in the middle;

[0028] Figure 8 for Figure 2 A partial structural diagram of the piston end of a coffee extraction and tea brewing structure in one embodiment is shown.

[0029] In the diagram: 1. Main body of the device; 11. Brewing and extraction chamber; 12. Upper liquid inlet; 13. Lower liquid inlet; 2. First three-way valve; 21. A port; 22. B port; 23. C port; 3. Second three-way valve; 31. A1 port; 32. B1 port; 33. C1 port; 5. Piston; 6. Liquid inlet screen; 61. Liquid distribution space; 51. Mounting groove; 52. Flow diffuser protrusion; 53. Flow diffuser area; 62. Liquid passage hole. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0032] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] like Figures 1-3 The diagram illustrates a coffee extraction and tea brewing structure according to an embodiment of this invention. The main body 1 of the device contains a brewing and extraction chamber 11. The shape of the brewing and extraction chamber 11 can be vertical or inclined, but it must have two ends with a height difference. An upper liquid inlet 12 is provided at the upper end, and a lower liquid inlet 13 is provided at the lower end. The two liquid inlets are used to connect the brewing and extraction chamber 11 to an external pipeline, respectively. The interior of the chamber is used to hold coffee powder or tea powder. A first three-way valve 2 has an A port 21, a B port 22, and a C port 23. The A port 21 is fixedly connected to the lower liquid inlet 13 of the brewing and extraction chamber 11, the B port 22 is connected to the first branch pipeline of the hot water source, and the C port 23 is connected to the tea outlet pipeline. The three-way valve can achieve connection between the A port 21 and the B port 22 or between the A port 21 and the C port 23 through the linear sliding or rotation of the valve core. The second three-way valve 3 has an A1 port 31, a B1 port 32, and a C1 port 33. The A1 port 31 is fixedly connected to the upper liquid inlet 12 of the brewing and extraction chamber 11, the B1 port 32 is connected to the second branch pipe of the hot water source, and the C1 port 33 is connected to the coffee outlet pipe. Similarly, by switching the valve core, the A1 port 31 and the B1 port 32 or the A1 port 31 and the C1 port 33 can be connected. In the device, the pressure in the extraction chamber during coffee extraction can be adjusted by the pressure control system, and the pressure in the extraction chamber during extraction can be controlled by the pressure of the coffee maker, the flow rate of the liquid pump, and the coarseness of the coffee powder by the electronic control system.

[0037] In coffee extraction mode, the control system drives the valve core of the first three-way valve 2 to move, disconnecting port A 21 from port C 23 and connecting it to port B 22. Simultaneously, it drives the valve core of the second three-way valve 3 to move, disconnecting port A1 31 from port B1 32 and connecting it to port C1 33. At this time, hot water from the hot water source flows into the lower outlet 13 through ports B 22 and A 21 of the first three-way valve 2, passing upwards through the coffee grounds layer in the brewing extraction chamber 11, carrying the extracted substances out through the upper outlet 12, and then through ports A1 31 and C1 33 of the second three-way valve 3 into the pipeline containing the pressure control system. When the pressure control system detects that the fluid pressure has reached the high-pressure threshold required for coffee extraction (e.g., 8-9 bar), it controls the pressure within the extraction chamber during extraction by controlling the pressure of the coffee tamper, the flow rate of the liquid pump, and adjusting the coarseness of the coffee grounds. Finally, the extracted liquid is discharged through the coffee outlet.

[0038] In tea powder brewing mode, the control system switches the valve core of the first three-way valve 2 to disconnect A port 21 from B port 22 and connect to C port 23, while simultaneously switching the valve core of the second three-way valve 3 to connect A1 port 31 from B1 port 32 and disconnect C1 port 33. Hot water from the hot water source flows into the upper liquid outlet 12 through B1 port 32 and A1 port 31 of the second three-way valve 3, passes through the tea powder layer in the brewing extraction chamber 11 from top to bottom, flows out through the lower liquid outlet 13, and then flows directly to the tea outlet through A port 21 and C port 23 of the first three-way valve 2. At this time, the pressure control system does not need to perform pressure control. The water flows through the chamber at normal pressure (close to atmospheric pressure) and a flow rate suitable for tea extraction, avoiding high pressure from damaging the tea components.

[0039] Through the linkage switching of the first three-way valve 2 and the second three-way valve 3, the brewing and extraction chamber 11 achieves bidirectional switching between the inlet and outlet: when extracting coffee, a "bottom in, top out" path is adopted, and the high-pressure environment established in the coffee outlet pipeline by the pressure control system meets the high-pressure penetration extraction conditions required for coffee powder extraction, ensuring that caffeine, oils and other components are fully extracted; when brewing tea powder, a "top in, bottom out" path is adopted, and the gravity osmosis under normal pressure is used to release tea polyphenols, amino acids and other components in tea leaves according to different solubility gradients, avoiding component imbalance caused by high pressure.

[0040] The two-way valve design integrates the fluid paths for coffee extraction and tea brewing into the same brewing chamber 11. Through valve on / off combinations (four connection states, only two effective states are used), it avoids the drawbacks of traditional equipment requiring separate coffee extraction and tea brewing units, reducing redundant configuration of heating modules and piping systems. The intervention of the pressure control system precisely controls the pressure parameters during coffee extraction. Its collaborative work with the three-way valve allows the same chamber to exhibit different fluid dynamic characteristics in two modes (high pressure, high speed vs. normal pressure, low speed), solving the technical bottleneck mentioned in the background that "coffee extraction equipment cannot be used for tea brewing."

[0041] This structure achieves functional integration while maintaining a compact size by sharing the core extraction chamber and valve assembly. Consumers no longer need to purchase separate coffee and tea machines, reducing space requirements and operating costs. Simultaneously, the bidirectional liquid flow design provides structural adjustment space for future expansion functions (such as extraction with different powder amounts and particle size adaptation). Optimization of the valve switching logic further enables compatibility with the extraction needs of more beverage ingredients, enhancing the equipment's versatility and market adaptability.

[0042] like Figures 1-8 As shown, the upper and lower ends of the brewing and extraction chamber 11 are respectively equipped with an upper piston 5 and a lower piston 5 that can slide vertically. The two pistons 5 are connected by guide columns or slide rails extending vertically along the inner wall of the chamber, and can slide synchronously or independently to adjust the volume of the chamber. A liquid-passing mesh 6 is fixedly installed on the lower end face of the upper piston 5 and the upper end face of the lower piston 5. An annular liquid distribution space 61 is formed between the liquid-passing mesh 6 and the end face of the piston 5. The liquid distribution space 61 is provided with several radially distributed diffuser protrusions 52. A through hole communicating with the upper liquid outlet 12 is opened in the middle of the upper piston 5, and a through hole communicating with the lower liquid outlet 13 is opened in the middle of the lower piston 5. The outer peripheral wall of the piston 5 is sealed to the inner wall of the chamber. When extracting coffee, the drive mechanism moves the piston 5 to slide towards the center of the cavity, compressing the coffee powder into a cake. At this time, hot water passes through the liquid distribution space 61 of the upper piston 5 and is divided into multiple streams by the diffuser protrusion 52. The hot water is then evenly sprayed onto the surface of the cake through the liquid filter 6. When brewing tea, the piston 5 remains stationary, the cavity volume remains unchanged, and the hot water passes through the liquid distribution space 61 of the lower piston 5 and is guided by the diffuser protrusion 52 to evenly moisten the tea powder layer.

[0043] The combined design of the sliding piston 5 and the liquid distribution space 61 not only achieves dynamic adjustment of the cavity volume to adapt to different extraction needs, but also optimizes the water flow distribution through the structure of the liquid-passing mesh 6 and the diffuser protrusions 52: during coffee extraction, the compressed coffee puck shortens the water flow path, and with the guiding effect of the liquid distribution space 61, the high-pressure water flow penetrates the coffee grounds evenly, improving extraction efficiency; during tea brewing, the cavity space is maintained, and the diffuser protrusions 52 guide the normal-pressure water flow to slowly wet the tea, avoiding component imbalance caused by local rinsing. The synergistic work of the sliding piston 5 and the liquid distribution space 61 forms a progressive optimization from volume control to water flow distribution, solving the differentiated needs of different raw materials for extraction space and water flow patterns, and providing a basic framework for subsequent improvements to the installation method of the liquid-passing mesh 6 and the structure of the liquid passage 62.

[0044] like Figures 2-6 As shown, the upper and lower pistons have mounting grooves 51 on the side facing the cavity, and the liquid-passing mesh 6 is detachably installed in the mounting groove 51. The diameter of the liquid-passing mesh 6 is larger than the diameter of the groove opening of the mounting groove 51. The edge is embedded into the groove by an interference fit and is fixed to the bottom of the groove by a central bolt. Because it is an interference fit, the liquid-passing mesh 6 needs to be made of elastic material, and the edge lip fits tightly against the groove wall. The center is fixed by a bolt, and the central through hole of the liquid-passing mesh 6 is connected to the threaded hole at the bottom of the groove by a bolt. The edge is limited by a fitting with the inner wall of the groove opening.

[0045] The detachable liquid distribution screen 6 structure further enhances the ease of equipment maintenance and adaptability based on the piston 5 and the liquid distribution space 61: the interference fit simplifies assembly, the material elasticity ensures sealing, and it is suitable for atmospheric pressure brewing scenarios; the bolt fixing provides structural strength under high pressure environment to meet the pressure requirements of coffee extraction.

[0046] In a further technical solution, since the upper piston has a shorter movement distance within the brewing and extraction chamber 11, an O-ring is used for sealing the upper piston. However, the lower piston has a longer movement distance within the brewing and extraction chamber 11, and it is necessary to scrape and discharge the waste material within the brewing and extraction chamber 11. Therefore, a Y-ring is used for sealing the lower piston. Thus, combining different sealing structures, the liquid-passing mesh 6 of the upper piston is installed through the mounting groove, while the liquid-passing mesh 6 of the lower piston is snapped in place by the sealing structure of the Y-ring itself.

[0047] like Figure 8 As shown, the diffuser protrusions 52 within the liquid distribution space 61 are evenly distributed radially along the end face of the piston 5, numbering 8-12 in total. They extend from the center to the edge in a long strip shape, dividing the liquid distribution space 61 into equiangular fan-shaped diffuser regions 53. The cross-section of the protrusions is a trapezoid with a rounded transition, and the height occupies 1 / 2-2 / 3 of the liquid distribution space 61, ensuring that the water flow is symmetrically distributed in the circumferential range.

[0048] The uniformly distributed diffuser protrusions 52, based on the preceding liquid distribution space 61, achieve precise water flow distribution through geometric optimization: radial distribution creates a radial flow path, avoiding concentrated scouring in the central area; equidistant intervals ensure consistent hydrodynamic characteristics in each diffuser area 53, achieving stable extraction results whether it's uniform penetration of coffee puck during high-pressure coffee extraction or circumferential wetting during normal-pressure tea brewing. The structural design of the diffuser protrusions 52, combined with the sliding function of the piston 5, dynamically adjusts the cavity volume while ensuring water flow uniformity through fixed flow guidance zones, forming a multi-level optimization from spatial control to fluid control, enhancing the equipment's ability to accurately adapt to different extraction parameters.

[0049] like Figures 6-7 As shown, funnel-shaped liquid passage holes 62 are opened on the liquid passage mesh 6. The diameter of the holes gradually increases from one side of the cavity to the side of the piston 5, forming a flared structure that is narrow on the outside and wide on the inside. The liquid passage holes 62 are evenly distributed on the surface of the liquid passage mesh 6, corresponding one-to-one with the diffusion areas 53 of the diffusion protrusions 52, ensuring that water is ejected from each area.

[0050] like Figures 1-3 As shown, the coffee machine includes the aforementioned coffee extraction and tea brewing structure: the brewing and extraction chamber 11 within the main body 1 has its volume adjusted by upper and lower pistons 5. The liquid-passing mesh 6 on the end face of the piston 5 cooperates with the flow-dispersing protrusion 52 in the liquid distribution space 61 to control the water flow distribution. The liquid-passing mesh 6 is fixed in the mounting groove 51 of the piston 5 by interference fit or bolts. The liquid passage 62 adopts a funnel-shaped flared structure. The first and second three-way valves 3 switch the water flow direction, and the pressure control system adjusts the coffee extraction pressure, forming an integrated structure that combines high-pressure coffee extraction and normal-pressure tea powder brewing functions.

[0051] The three-way valve assembly enables the switching of water flow direction, the piston 5 system dynamically adjusts the extraction space, the liquid filter 6 and the flow guide structure precisely control the water flow pattern, and the pressure control system ensures a high-pressure environment. These components, through their interrelationships, form a progressive technical solution. This integration not only solves the problem of traditional equipment having only one function, but also achieves precise control of extraction parameters for different beverages through structural optimization. It integrates two functions within a compact volume, reducing user purchase costs and space requirements, and providing a modular and adjustable design model for multifunctional beverage preparation equipment.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A coffee extraction and tea brewing structure, characterized in that, include: The main body of the device (1) is provided with a brewing and extraction chamber (11) inside. The upper end of the brewing and extraction chamber (11) is provided with an upper liquid outlet (12) and the lower end is provided with a lower liquid outlet (13) for holding coffee powder or tea powder. The first three-way valve (2) has an A port (21), a B port (22) and a C port (23). The A port (21) is connected to the lower liquid outlet (13), the B port (22) is connected to the hot water source, and the C port (23) is connected to the tea outlet. The first three-way valve (2) is configured to switch the connection state, which is used to switch the connection between the A port (21) and the B port (22) or between the A port (21) and the C port (23). The second three-way valve (3) has an A1 port (31), a B1 port (32) and a C1 port (33). The A1 port (31) is connected to the upper liquid inlet (12), the B1 port (32) is connected to the hot water source, and the C1 port (33) is connected to the coffee outlet. The second three-way valve (3) is configured to switch the connection state, which is used to switch the connection between the A1 port (31) and the B1 port (32) or between the A1 port (31) and the C1 port (33).

2. The coffee extraction and tea brewing structure according to claim 1, characterized in that, The brewing and extraction chamber (11) extends vertically. Two pistons (5) that can slide vertically are respectively provided at the upper and lower ends of the brewing and extraction chamber (11). The upper liquid outlet (12) is connected to the brewing and extraction chamber (11) through the upper piston (5), and the lower liquid outlet (13) is connected to the brewing and extraction chamber (11) through the lower piston (5). The two pistons (5) are used to adjust the volume of the brewing and extraction chamber (11) after sliding.

3. The coffee extraction and tea brewing structure according to claim 2, characterized in that, Both pistons (5) are provided with liquid-passing mesh (6) on the side facing the brewing and extraction chamber (11). The liquid-passing mesh (6) and the pistons (5) form a liquid distribution space (61). The upper liquid-passing port (12) and the lower liquid-passing port (13) are respectively connected to the brewing and extraction chamber (11) through the two liquid distribution spaces (61).

4. The coffee extraction and tea brewing structure according to claim 3, characterized in that, Both pistons (5) have mounting grooves (51) on the side facing the brewing and extraction chamber (11), and the liquid filter (6) is detachably installed in the mounting groove (51).

5. The coffee extraction and tea brewing structure according to claim 4, characterized in that, The diameter of the liquid-passing mesh (6) is larger than the diameter of the mounting groove (51) so that the side wall of the liquid-passing mesh (6) and the inner wall of the mounting groove (51) form an interference fit.

6. The coffee extraction and tea brewing structure according to claim 4, characterized in that, The piston (5) also has a plurality of flow-diffusing protrusions (52) located in the liquid distribution space (61), which divide the liquid distribution space (61) into a plurality of flow-diffusing regions (53).

7. The coffee extraction and tea brewing structure according to claim 6, characterized in that, Several of the aforementioned flow-diffusing protrusions (52) are evenly distributed radially along the liquid distribution space (61).

8. The coffee extraction and tea brewing structure according to claim 3, characterized in that, The liquid-passing mesh (6) has a funnel-shaped liquid-passing hole (62), and the diameter of the liquid-passing hole (62) gradually increases from the side of the brewing and extraction chamber (11) to the side of the piston (5).

9. A coffee machine, characterized in that, Includes the coffee extraction and tea brewing structure as described in any one of claims 1-8.

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