Powder pressing waterway structure of coffee machine

Abstract

The utility model discloses a powder pressing waterway structure of a coffee machine, which comprises a powder pressing structure and a waterway structure, the powder pressing structure comprises a fixed frame, a piston component arranged in the fixed frame, a powder pressing component arranged at the lower end of the piston component and an extraction funnel component arranged at the lower end of the powder pressing component, the waterway structure comprises a water tank, a water pump, an electromagnetic valve, a four-way pipe, a boiler, a one-way backpressure connector and a waterway unit. The coffee machine is reasonable in structural design, the occupied space is reduced by arranging the water path structure and the powder pressing structure, and the internal layout of the coffee machine is more compact; and the water path unit comprises a first water path channel, a second water path channel and a four-way pipe water path assembly, accurate distribution and efficient utilization of water flow are ensured, when the water pump works and the electromagnetic valve is closed, the water flow can accurately flow to the powder pressing structure, and a stable power source is provided for subsequent powder pressing and extraction.

Description

TECHNICAL FIELD

[0001] The utility model relates to coffee brewing field especially, it relates to a coffee machine's powder pressing waterway structure. BACKGROUND

[0002] The existing powder pressing waterway structure has many deficiencies. The common powder pressing structure often cannot realize accurate and stable powder pressing operation, and the amount of coffee powder in the powder bowl is uneven, which leads to uneven compaction of coffee powder, affecting the extraction effect and taste of coffee. The waterway design is not reasonable, the water flow and pressure control are not accurate, and problems such as unstable water pressure and uneven hot water distribution are prone to occur, thereby reducing the quality and production efficiency of coffee. In addition, the traditional semi-automatic coffee machine needs to be sealed and pressed under high pressure, which makes it difficult to rotate the funnel cup and inconvenient to use. SUMMARY

[0003] The utility model solves the technical problem in the prior art, and provides a coffee machine's powder pressing waterway structure.

[0004] The utility model adopts the technical scheme for solving the above technical problem: a coffee machine's powder pressing waterway structure, including powder pressing structure and waterway structure, the powder pressing structure includes fixed frame, piston assembly arranged in the fixed frame, powder pressing assembly arranged in the lower end of the piston assembly and extraction funnel assembly arranged in the lower end of the powder pressing assembly, the waterway structure includes water tank, water pump, electromagnetic valve, four-way pipe, boiler, one-way back pressure joint and waterway unit, the waterway unit includes:

[0005] The water tank, the water pump and the four-way pipe are sequentially communicated to constitute a first waterway channel;

[0006] The water tank, the electromagnetic valve and the four-way pipe are sequentially communicated to constitute a second waterway channel;

[0007] The four-way pipe waterway assembly includes a first pipe waterway channel and a second pipe waterway channel, the first pipe waterway channel is communicated with the four-way pipe and the piston assembly, the boiler, the one-way back pressure joint and the powder pressing assembly are sequentially communicated to constitute the second pipe waterway channel;

[0008] When the water pump works, the electromagnetic valve is closed, the water in the water tank flows to the four-way pipe through the first waterway channel, the four-way pipe makes water flow to the piston assembly and the boiler through the first pipe waterway channel and the second pipe, the piston assembly drives the powder pressing assembly to press down with the increase of water pressure, when the pressure of the piston assembly is greater than the pressure in the one-way back pressure joint, the hot water in the boiler flows to the powder pressing assembly through the one-way back pressure joint, and the hot water is guided into the extraction funnel assembly through the powder pressing assembly;

[0009] When the water pump stops working, the electromagnetic valve opens, and the pressure in the piston assembly is released through the electromagnetic valve, and as the pressure in the piston assembly decreases, the powder pressing assembly is reset.

[0010] Preferably, the piston assembly comprises a fixed piston, a movable piston arranged in the fixed piston, and a pressing base connected to the movable piston, the powder pressing assembly is arranged at the lower end of the pressing base, and the first through-pipe water channel communicates the four-way pipe with the movable piston; when the water pressure increases in the movable piston, the movable piston is pressed downward, and the pressing base drives the powder pressing assembly to press downward as the movable piston moves.

[0011] The above components achieve the effect that the fixed piston provides stable guidance and support for the movable piston, ensuring that the movable piston can move linearly under the action of water pressure without deviation or jamming. The movable piston can sensitively respond to changes in water pressure and convert the water pressure into downward pressure, thereby driving the pressing base to perform the powder pressing action. This design allows the force and speed of powder pressing to be accurately adjusted according to water pressure, adapting to different types and grinding degrees of coffee powder and improving the uniformity and consistency of powder pressing. The pressing base is tightly connected to the movable piston, allowing the pressure generated by the movable piston to be transmitted to the powder pressing assembly without loss, ensuring efficient and stable powder pressing action and avoiding pressure loss and energy waste.

[0012] Preferably, the powder pressing assembly comprises a valve sleeve and a powder pressing hammer arranged in the valve sleeve, the boiler, the one-way back pressure joint, and the powder pressing hammer are sequentially connected to form the second through-pipe water channel, the powder pressing hammer is connected to the pressing base, an elastic member is arranged between the valve sleeve and the pressing base, the valve sleeve is elastically connected to the pressing base through the elastic member, the valve sleeve is arranged with a funnel locking block along the inner wall, and the extraction funnel assembly is clamped in the valve sleeve through the funnel locking block.

[0013] The above components achieve the effect that the valve sleeve provides an accurate movement track for the powder pressing hammer, ensuring that the powder pressing hammer can move vertically up and down to uniformly compact the coffee powder; the powder pressing hammer is connected to the pressing base, which can timely and accurately respond to the action of the pressing base, improving the timeliness and accuracy of powder pressing; the addition of the elastic member provides a buffer for the powder pressing process, avoiding damage to the components caused by excessive pressure, and helping the powder pressing assembly to quickly reset after the powder pressing is completed; the funnel locking block allows the extraction funnel assembly to be securely installed in the valve sleeve, and even under the action of water pressure and vibration, it will not loosen or fall off, ensuring the stability and safety of the extraction process.

[0014] Preferably, the extraction funnel assembly comprises a funnel cup, a powder bowl arranged in the funnel cup, and a handle arranged on the funnel cup, the lower end of the funnel cup is provided with a water outlet nozzle, the outer wall of the funnel cup is arranged with a funnel clamping block which is clamped with a funnel locking block, and the funnel cup is clamped in the valve sleeve through the cooperation of the funnel locking block and the funnel clamping block and the handle.

[0015] The effects achieved by the above components are that the design of the funnel cup facilitates holding and operation; the arrangement of the powder bowl can accommodate an appropriate amount of coffee powder, ensuring the stability of the amount of coffee extracted each time; the design of the handle facilitates the user to install and remove the extraction funnel assembly, improving the convenience of use; the water outlet nozzle can control the outflow speed and flow of coffee liquid, avoiding splashing or poor outflow of coffee liquid; the cooperation of the funnel clamping block and the funnel locking block is ingenious, and firm installation can be achieved through a simple rotating action, which is also convenient for disassembly, cleaning and maintenance.

[0016] Preferably, the lower end of the powder hammer is arranged with a first sealing ring and a water inlet filter piece, and the valve sleeve is further arranged with a powder bowl blocking block on the inner wall for preventing the powder bowl from separating from the funnel cup.

[0017] The effects achieved by the above components are that the first sealing ring at the lower end of the powder hammer effectively prevents leakage of hot water during the extraction process, ensuring the stability of water pressure and the effect of extraction; the water inlet filter piece can filter out impurities in the water, preventing impurities from entering the coffee powder and affecting the taste and quality of coffee; the powder bowl blocking block on the inner wall of the valve sleeve avoids the spilling and waste of coffee powder, and also ensures the continuity and stability of extraction.

[0018] During the powder pressing process, the extraction funnel assembly forms a sealed state through the sealing ring. When the lifting is completed and the piston retreats, the coffee powder in the powder bowl and the water inlet filter piece form a negative pressure, and the powder bowl will rise upwards, and when it rises to the powder bowl blocking block, it will resist the powder bowl to prevent the powder bowl from separating from the funnel cup.

[0019] Preferably, a second sealing ring for preventing water leakage is arranged between the movable piston and the fixed piston.

[0020] The effects achieved by the above components are that the second sealing ring between the movable piston and the fixed piston greatly improves the sealing performance of the piston assembly, effectively prevents water from leaking from the gap of the piston assembly, ensures the stability of water pressure and effective use of energy, prolongs the service life of the coffee machine, and reduces the maintenance cost.

[0021] Compared with the prior art, the coffee machine has the advantages that: the powder pressing structure and the waterway structure are arranged, the space occupation is reduced, and the internal layout of the coffee machine is more compact; the waterway unit includes a first waterway channel, a second waterway channel and a four-way pipe waterway assembly, the accurate distribution and efficient utilization of water flow are ensured, when the water pump works and the electromagnetic valve is closed, the water flow can accurately flow to the powder pressing structure, and a stable power source is provided for subsequent powder pressing and extraction, the piston pressing action is adopted, the sealing is not required when the funnel cup is screwed, and labor is saved; and the piston pressing action can ensure that the coffee powder in the powder bowl can be pressed regardless of the amount of the coffee powder, the coffee extraction effect is not affected by the amount of the coffee powder, and the coffee quality is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a connection state schematic view of the powder pressing structure and the waterway structure of the utility model;

[0023] Fig. 2 is an exploded structure schematic view of the powder pressing structure of the utility model;

[0024] Fig. 3 is a structure schematic view of the powder pressing structure of the utility model.

[0025] The drawings show that: 1, powder pressing structure; 2, waterway structure; 3, fixed frame; 4, piston assembly; 5, powder pressing assembly; 6, extraction funnel assembly; 7, water tank; 8, water pump; 9, electromagnetic valve; 10, four-way pipe; 11, boiler; 12, one-way back pressure connector; 13, waterway unit; 14, first waterway channel; 15, second waterway channel; 16, four-way pipe assembly; 17, first pipe waterway channel; 18, second pipe waterway channel; 19, fixed piston; 20, moving piston; 21, pressing base; 22, valve sleeve; 23, powder pressing hammer; 24, elastic member; 25, funnel locking block; 26, funnel cup; 27, powder bowl; 28, handle; 29, funnel clamping block; 30, water outlet nozzle; 31, first sealing ring; 32, water inlet filter piece; 33, powder bowl stop block; 34, second sealing ring. DETAILED DESCRIPTION

[0026] The utility model discloses a plurality of embodiments will be disclosed in the following drawings, for clear description, many practical details will be described in the following together. However, it should be appreciated that these practical details should not be used to limit the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. In addition, for the sake of simplifying the drawing, some conventional structures and components will be drawn in the drawing in a simple schematic way.

[0027] It should be noted that all directional indications, such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, in addition to being used to represent the orientation or positional relationship, the above-mentioned terms can also be used to represent other meanings, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases, and those skilled in the art can understand the specific meanings of these terms in the present application according to specific circumstances.

[0029] In addition, the terms "mounting", "setting", "provided with", "connecting", "connected", "sleeved" should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication between two devices, elements or components. The connection mode involved in the present application is prior art and does not have any improvement, and belongs to the common knowledge of those skilled in the art. Those skilled in the art can understand the specific meanings of the above-mentioned terms in the present application according to specific circumstances.

[0030] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and does not mean to specially indicate the order or sequence, nor to limit the present application. It is only used to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0031] In the present embodiment 1,

[0032] As Figs. 1-3 shown, the present application provides a coffee machine powder pressing waterway structure 2, which comprises a powder pressing structure 1 and a waterway structure 2. The powder pressing structure 1 comprises a fixed frame 3, a piston assembly 4 arranged in the fixed frame 3, a powder pressing assembly 5 arranged at the lower end of the piston assembly 4, and an extraction funnel assembly 6 arranged at the lower end of the powder pressing assembly 5. The waterway structure 2 comprises a water tank 7, a water pump 8, an electromagnetic valve 9, a four-way pipe 10, a boiler 11, a one-way back pressure connector 12, and a waterway unit 13. The waterway unit 13 comprises:

[0033] The first water channel 14 is formed by the water tank 7, the water pump 8 and the four-way pipe 10 in sequence;

[0034] The second water channel 15 is formed by the water tank 7, the electromagnetic valve 9 and the four-way pipe 10 in sequence;

[0035] The four-way pipe 10 water channel assembly includes the first four-way pipe water channel 17 and the second four-way pipe water channel 18, the first four-way pipe water channel 17 connects the four-way pipe 10 and the piston assembly 4, and the second four-way pipe water channel 18 is formed by the boiler 11, the one-way back pressure joint 12 and the powder pressing assembly 5 in sequence;

[0036] When the water pump 8 works and the electromagnetic valve 9 is closed, the water in the water tank 7 flows to the four-way pipe 10 through the first water channel 14, and the four-way pipe 10 makes the water flow to the piston assembly 4 and the boiler 11 through the first four-way pipe water channel 17 and the second four-way pipe water channel 18 respectively, and the piston assembly 4 drives the powder pressing assembly 5 to press down as the water pressure increases, and when the pressure of the piston assembly 4 is greater than the pressure in the one-way back pressure joint 12, the hot water in the boiler 11 flows to the powder pressing assembly 5 through the one-way back pressure joint 12, and the hot water is guided into the extraction funnel assembly 6 through the powder pressing assembly 5;

[0037] When the water pump 8 stops working and the electromagnetic valve 9 is opened, the pressure in the piston assembly 4 is released through the electromagnetic valve 9, and the powder pressing assembly 5 is reset as the pressure in the piston assembly 4 decreases.

[0038] By arranging the powder pressing structure 1 and the water channel structure 2, the space occupation is reduced, the internal layout of the coffee machine is more compact, the water channel unit 13 includes the first water channel 14, the second water channel 15 and the four-way pipe 10 water channel assembly, and the accurate distribution and efficient utilization of water flow are ensured. When the water pump 8 works and the electromagnetic valve 9 is closed, the water flow can accurately flow to the powder pressing structure 1, providing a stable power source for subsequent powder pressing and extraction. When the water pump 8 stops working and the electromagnetic valve 9 is opened, the pressure can be effectively released in time, the powder pressing assembly 5 is reset, and the working efficiency and stability of the coffee machine are greatly improved.

[0039] The piston assembly 4 includes a fixed piston 19, a movable piston 20 arranged in the fixed piston 19 and a pressing base 21 connected to the movable piston 20, the powder pressing assembly 5 is arranged at the lower end of the pressing base 21, and the first four-way pipe water channel 17 connects the four-way pipe 10 and the movable piston 20; when the water flow increases the water pressure in the movable piston 20 and drives the movable piston 20 to press down, the pressing base 21 drives the powder pressing assembly 5 to press down as the movable piston 20 moves.

[0040] The principle of the piston assembly 4 is based on the incompressibility of liquid. When the liquid is subjected to a certain pressure, it will transmit force and produce corresponding movement. The fixed piston 19 provides stable guidance and support for the moving piston 20, ensuring that the moving piston 20 can move linearly under the action of water pressure without deviation or jamming. The moving piston 20 can sensitively respond to changes in water pressure and convert the water pressure into downward pressure, thereby driving the lower base 21 to perform the powder pressing action. This design allows the force and speed of powder pressing to be accurately adjusted according to the water pressure, adapting to different types and grinding degrees of coffee powder and improving the uniformity and consistency of powder pressing; the lower base 21 is tightly connected with the moving piston 20, which can transmit the pressure generated by the moving piston 20 to the powder pressing assembly 5 without loss, ensuring the efficiency and stability of the powder pressing action and avoiding pressure loss and energy waste.

[0041] The powder pressing assembly 5 includes a valve sleeve 22 and a powder pressing hammer 23 arranged in the valve sleeve 22, the boiler 11, the one-way back pressure joint 12 and the powder pressing hammer 23 are sequentially communicated to form the second through-pipe water channel 18, the powder pressing hammer 23 is connected with the lower base 21, and the valve sleeve 22 and the lower base 21 are arranged with an elastic member 24, the valve sleeve is elastically connected with the lower base 21 through the elastic member 24, the valve sleeve 22 is arranged with a funnel locking block 25 along the inner wall, and the extraction funnel assembly 6 is clamped in the valve sleeve 22 through the funnel locking block 25.

[0042] The valve sleeve 22 provides an accurate movement track for the powder pressing hammer 23, ensuring that the powder pressing hammer 23 can move vertically up and down to realize uniform compaction of coffee powder; the powder pressing hammer 23 is connected with the lower base 21, which can respond to the action of the lower base 21 in time and accurately, improving the timeliness and accuracy of powder pressing; the addition of the elastic member 24 provides a buffer for the powder pressing process, avoiding damage to the components caused by excessive pressure, and helping the powder pressing assembly 5 to reset quickly after the powder pressing is completed; the funnel locking block 25 enables the extraction funnel assembly 6 to be firmly installed in the valve sleeve 22, and it will not loosen or fall off even under the action of water pressure and vibration, ensuring the stability and safety of the extraction process.

[0043] The extraction funnel assembly 6 includes a funnel cup 26, a powder bowl 27 arranged in the funnel cup 26 and a handle 28 arranged on the funnel cup 26, the lower end of the funnel cup 26 is provided with a water outlet nozzle 30, the outer wall of the funnel cup 26 is arranged with a funnel clamping block 29 clamped with the funnel locking block 25, and the funnel cup 26 is clamped in the valve sleeve 22 by rotating the handle 28 through the cooperation of the funnel locking block 25 and the funnel clamping block 29.

[0044] The design of funnel cup 26 facilitates holding and operation; the setting of powder bowl 27 can accommodate an appropriate amount of coffee powder, ensuring the stable amount of coffee extracted each time. The design of handle 28 facilitates users to install and remove extraction funnel assembly 6, improving the convenience of use; water outlet nozzle 30 can control the outflow speed and flow of coffee liquid, avoiding splashing or poor outflow of coffee liquid; the cooperation of funnel clamping block 29 and funnel locking block 25 is ingenious, and firm installation can be realized through simple rotating action, which is also convenient for disassembly, cleaning and maintenance.

[0045] The lower end of the powder pressing hammer 23 is arranged with a first sealing ring 31 and a water inlet filter piece 32, and the valve sleeve 22 is also arranged with a powder bowl stopper 33 on the inner wall for preventing the powder bowl 27 from being separated from the funnel cup 26.

[0046] The first sealing ring 31 at the lower end of the powder pressing hammer 23 effectively prevents leakage of hot water during the extraction process, ensuring the stability of water pressure and the effect of extraction; the water inlet filter piece 32 can filter out impurities in the water, preventing impurities from entering the coffee powder and affecting the taste and quality of coffee; the powder bowl stopper 33 on the inner wall of the valve sleeve 22 avoids the spilling and waste of coffee powder, and also ensures the continuity and stability of extraction.

[0047] During the powder pressing process, the extraction funnel assembly 6 forms a sealed state through the sealing ring. When the lifting is completed and the piston retreats, the coffee powder in the powder bowl 27 and the water inlet filter piece 32 form a negative pressure, and the powder bowl 27 will rise upwards. When it rises to the powder bowl stopper 33, it will resist the powder bowl 27, preventing the powder bowl 27 from being separated from the funnel cup 26.

[0048] The second sealing ring 34 is arranged between the moving piston 20 and the fixed piston 19 for preventing water leakage.

[0049] The second sealing ring 34 between the moving piston 20 and the fixed piston 19 greatly improves the sealing performance of the piston assembly 4, effectively preventing water from leaking from the gap of the piston assembly 4, ensuring the stability of water pressure and the effective use of energy, prolonging the service life of the coffee machine and reducing maintenance costs.

[0050] As shown in Figs. 1-3 By setting the waterway structure 2 and the powder pressing structure 1, the water flow and pressure can be ensured to be stable when making coffee, the powder pressing is uniform, and the hot water extraction is sufficient, thereby improving the quality and taste of coffee. The components cooperate closely, the structure is reasonable, and the operation is simple, greatly improving the work efficiency; and because the piston is pressed downward, it does not need to be sealed when rotating into the funnel cup, which is labor-saving; the downward pressing of the piston can ensure that the coffee powder in the powder bowl is pressed tightly regardless of the amount of coffee powder, ensuring that the coffee extraction effect is not affected by the amount of powder, and making the coffee quality more stable.

[0051] In this embodiment 2,

[0052] AsFigs. 1-3 As shown, when coffee needs to be made, water pump 8 starts working and solenoid valve 9 closes. At this time, water in water tank 7 flows through the first water passage 14 (water tank 7, water pump 8, and four-way pipe 10 are connected in sequence) to four-way pipe 10. Four-way pipe 10 guides water through the first water passage 17 to piston assembly 4, and through the second water passage 18 to boiler 11.

[0053] Water flows to piston assembly 4 and enters the interior of moving piston 20. The water pressure gradually increases, causing moving piston 20 to press downward. Since the pressing base 21 is connected to moving piston 20, the pressing base 21, along with the movement of moving piston 20, causes the tamping assembly 5 to press down, compacting the coffee powder below.

[0054] Simultaneously, when the pressure inside the piston assembly 4 is greater than the pressure inside the one-way back pressure connector 12, the hot water in the boiler 11 flows through the one-way back pressure connector 12 to the tamping assembly 5. The hot water is then guided through the tamping assembly 5 into the extraction funnel assembly 6 to extract the tamped coffee powder.

[0055] Once the coffee is brewed, the water pump 8 stops working, and the solenoid valve 9 opens. At this time, the pressure inside the piston assembly 4 is released through the solenoid valve 9. As the pressure inside the piston assembly 4 decreases, the tamping assembly 5 is reset under the action of the elastic element 24, preparing for the next coffee brewing.

[0056] In this embodiment 3,

[0057] like Figs. 1-3 As shown, when the piston assembly 4 drives the tamping assembly 5 to press down on the extraction funnel assembly 6 to tamp the coffee powder, until the coffee powder in the portafilter 27 is compacted, the resulting pressure is F1. When hot water enters the portafilter 27, it extracts the coffee liquid, generating pressure F2. During operation, because they are in the same water path, the pressures above and below are balanced. However, because the pressure area inside the piston assembly 4 is greater than the pressure area inside the portafilter 27, pressure F1 is greater than pressure F2, and the piston assembly 4 is always in a downward pressing state.

[0058] In the description of this specification, references are made to the terms "one embodiment", "some embodiments", "example", "specific example".

[0059] The description of the term "an example" or "some examples" or the like means that a particular feature, structure, material or characteristic described in connection with the example is included in at least one embodiment or example of the present application. In this specification, illustrative representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples, without contradiction.

[0060] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet, welding and sticking in the prior art, which will not be described in detail here.

[0061] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, various modifications and changes can be made in the specific implementation mode and application range. The content of the specification should not be understood as a limitation of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A coffee maker's tamping water circuit structure, characterized in that: The system includes a powder pressing structure and a water circuit structure. The powder pressing structure includes a fixed frame, a piston assembly disposed within the fixed frame, a powder pressing component disposed at the lower end of the piston assembly, and an extraction funnel assembly disposed at the lower end of the powder pressing component. The water circuit structure includes a water tank, a water pump, a solenoid valve, a four-way pipe, a boiler, a one-way back pressure connector, and a water circuit unit. The water circuit unit includes: The first water passage is formed by sequentially connecting the water tank, the water pump and the four-way pipe. The second water passage is formed by sequentially connecting the water tank, the solenoid valve and the four-way pipe. The four-way water circuit assembly includes a first water circuit channel and a second water circuit channel. The first water circuit channel connects the four-way pipe and the piston assembly. The boiler, the one-way back pressure joint and the pulverizing assembly are sequentially connected to form the second water circuit channel. When the water pump is working, the solenoid valve is closed, and the water in the water tank flows to the four-way pipe through the first water passage. The four-way pipe, through the first water passage and the second water passage, allows the water to flow to the piston assembly and the boiler respectively. As the water pressure increases, the piston assembly drives the powder pressing assembly to press down. When the pressure of the piston assembly is greater than the pressure in the one-way back pressure connector, the hot water in the boiler flows to the powder pressing assembly through the one-way back pressure connector. The powder pressing assembly then guides the hot water into the extraction funnel assembly. When the water pump stops working, the solenoid valve opens, and the pressure inside the piston assembly is released through the solenoid valve. As the pressure inside the piston assembly decreases, the powder pressing assembly is reset.

2. The coffee tamping water circuit structure of a coffee machine according to claim 1, characterized in that: The piston assembly includes a fixed piston, a movable piston disposed inside the fixed piston, and a pressing base connected to the movable piston. The powder pressing assembly is arranged at the lower end of the pressing base. The first water passage connects the four-way pipe and the movable piston. When water flows into the movable piston, the water pressure increases, causing the movable piston to press downward. The pressing base moves with the movable piston, causing the powder pressing assembly to press downward.

3. The coffee tamping water circuit structure of a coffee machine according to claim 2, characterized in that: The powder pressing assembly includes a valve sleeve and a powder pressing hammer inserted inside the valve sleeve. The boiler, the one-way back pressure connector, and the powder pressing hammer are sequentially connected to form a second water passage. The powder pressing hammer is connected to the lower pressure base. An elastic element is arranged between the valve sleeve and the lower pressure base. The valve sleeve is elastically connected to the lower pressure base through the elastic element. A funnel locking block is arranged along the inner wall of the valve sleeve. The extraction funnel assembly is locked inside the valve sleeve by the funnel locking block.

4. The coffee tamping water circuit structure of a coffee machine according to claim 3, characterized in that: The extraction funnel assembly includes a funnel cup, a powder bowl disposed inside the funnel cup, and a handle disposed on the funnel cup. A water outlet is provided at the lower end of the funnel cup. A funnel locking block is arranged on the outer wall of the funnel cup, which engages with the funnel locking block. The funnel cup is locked in the valve sleeve by the funnel locking block and the funnel locking block in cooperation with the handle.

5. The tamping water circuit structure of a coffee machine according to claim 4, characterized in that: The lower end of the powder pressing hammer is provided with a first sealing ring and a water inlet filter, and the valve sleeve is also provided with a powder bowl baffle along its inner wall to prevent the powder bowl from detaching from the funnel cup.

6. The tamping water circuit structure of a coffee machine according to claim 2, characterized in that: A second sealing ring is provided between the movable piston and the fixed piston to prevent water leakage.

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