Hydraulic brewing head structure and coffee machine comprising same

Abstract

The invention relates to a hydraulic brewing head structure and a coffee machine comprising the same, and relates to the technical field of coffee machine brewing, the hydraulic brewing head structure comprises a fixed outer wall, a main body supporting structure forming a brewing head, a movable part which is arranged in the fixed outer wall in an up-and-down movable mode, and a closed hydraulic cavity formed between the movable part and the fixed outer wall, the shaft core assembly penetrates through the movable part, the upper end of the shaft core assembly is communicated with an external hot water source, the lower end of the shaft core assembly is communicated with the powder bowl, and the reset element provides elastic force enabling the movable part to reset upwards. And the pressurizing action of the hydraulic cavity and the liquid passing extraction action of the shaft core assembly form linkage control. According to the hydraulic brewing head structure and the coffee machine comprising the same, the technical problems that in the prior art, a coffee machine handle is poor in compatibility, and water is prone to leaking in the extraction process can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coffee machine brewing, in particular to a hydraulic brewing head structure and a coffee machine comprising the same. BACKGROUND

[0002] Espresso machines extract coffee essence by rapidly penetrating finely ground coffee powder with hot water at high temperature and high pressure. The performance of the brewing head, the core component, directly determines the extraction quality of coffee and the user experience. Currently, the mainstream commercial and household espresso machines on the market generally use fixed brewing heads.

[0003] The fixed brewing head has the following significant defects: Poor handle compatibility: Different brands of coffee machines have different key dimensions such as the thickness of the "ears" (protruding parts used to lock the handle on the brewing head) of the matching handle and the vertical distance from the ears to the upper edge of the powder bowl. This makes it difficult for users to install non-original or other brand handles on their own coffee machines, or even if they can install them, the seal will be loose due to size mismatch. Manufacturers also tend to create this incompatibility to maintain the accessory ecosystem, limiting user choices.

[0004] Water leakage during extraction: During the extraction process, the brewing head and the powder bowl are sealed by a sealing ring. The fixed brewing head relies on the user to rotate the handle to a specific angle to generate enough pre-tightening force to compress the sealing ring. If the user does not rotate to the correct position or the handle size has a slight deviation, it is easy to cause high-pressure hot water to leak from the gap, not only affecting the extraction pressure, but also dirtying the machine and posing a safety hazard.

[0005] High requirements for user powder pressing operation: The traditional coffee making process requires the user to press the powder after distributing it to ensure uniform coffee powder cake density. If the pressing force is uneven or the powder surface is uneven, it will cause hot water to pass through the path with less resistance (channel effect), resulting in uneven extraction. Although the fixed brewing head itself does not directly solve this problem, its fixed space has a low tolerance for the initial state of the powder cake. SUMMARY

[0006] To overcome the defects of the prior art, the present application proposes a hydraulic brewing head structure and a coffee machine comprising the same, which can solve the technical problems of poor handle compatibility and water leakage during extraction in the prior art.

[0007] To achieve this purpose, the present application adopts the following technical solutions: This invention provides a hydraulic brewing head structure, including a fixed outer wall forming the main support structure of the brewing head, a movable component that is movably disposed inside the fixed outer wall, forming a sealed hydraulic cavity between the movable component and the fixed outer wall, a shaft assembly passing through the movable component, the upper end of the shaft assembly being connected to an external hot water source, the lower end of the shaft assembly being connected to the coffee bowl, and a reset element providing an elastic force to reset the movable component upward. The hydraulic cavity is configured such that when pressurized liquid is introduced, it drives the movable component to move downward to press against the coffee bowl located below it. The pressurization action of the hydraulic cavity and the liquid extraction action of the shaft assembly are linked and controlled. Only after the movable component is pressed down to the upper edge of the coffee bowl to form an effective seal is the external hot water source supplied to the coffee bowl through the shaft assembly for extraction.

[0008] A preferred embodiment of the present invention is that the lower end of the shaft core assembly is also provided with a water distribution network, which drives the movable part to move downward along with the water distribution network when pressurized liquid is introduced.

[0009] A preferred embodiment of the present invention is that a cavity sealing ring is provided on the outer periphery of the movable part to achieve a seal between the movable part and the fixed outer wall, thereby forming a closed hydraulic cavity.

[0010] A preferred embodiment of the present invention is that the shaft core assembly is fixedly connected to the water distribution network by a locking member, and the movable member is axially confined therebetween.

[0011] A preferred embodiment of the present invention further includes a two-way valve, the first interface of which is connected to an external hot water source. The two-way valve is configured to: open when the pressure in the hydraulic chamber reaches a first preset value, allowing liquid to flow to the shaft assembly; and close when the pressure in the hydraulic chamber is lower than a second preset value.

[0012] A preferred embodiment of the present invention further includes a three-way connector, wherein the outlet end of the two-way valve is connected to the first interface of the three-way connector, the second interface of the three-way connector is connected to the inlet end of the shaft assembly, and the third interface of the three-way connector is connected to the wastewater pan.

[0013] A preferred embodiment of the present invention further includes a pressure relief pipeline, the pressure relief pipeline being controlled by a solenoid valve to release the liquid pressure. The pressure relief pipeline includes a first pressure relief path and a second pressure relief path. The first pressure relief path connects the hydraulic chamber to the wastewater pan and is used to directly discharge the liquid in the hydraulic chamber. The second pressure relief path connects to the upper end of the shaft core assembly and is used to discharge the residual extraction water.

[0014] A preferred embodiment of the present invention is that the lower end of the movable part is provided with a coffee bowl sealing ring, which is used to form a sealing contact with the upper edge of the coffee bowl of the coffee handle when the movable part moves down into place.

[0015] A preferred embodiment of the present invention is that the lower part of the fixed outer wall is provided with a locking structure for engaging with the ear of the coffee handle.

[0016] The preferred technical solution of the present invention is that the fixed outer wall is assembled and combined with an outer wall and a card holder that can be replaced by a two-ear snap-fit ​​structure or a three-ear snap-fit ​​structure to form a replaceable two-ear fixed outer wall and a three-ear fixed outer wall.

[0017] The present invention provides a coffee machine including the hydraulic brewing head structure described above.

[0018] The beneficial effects of this invention are: Compared with the prior art, the present invention has the following significant advantages: Exceptional Handle Compatibility: With the moving chamber at its highest point in the initial position, ample height space is provided for handle installation. This height space accommodates differences in the thickness of the handle ears from different brands, allowing for easy installation of most standard 58mm two- or three-handle handles (i.e., "horizontal compatibility"). During operation, the hydraulically driven chamber moves downward, adaptively compressing the portafilter, resolving issues of insufficient compression or sealing caused by differences in vertical distance (i.e., "vertical adaptive"). This makes one coffee machine compatible with the vast majority of handles on the market, greatly enhancing the product's user-friendliness and market competitiveness.

[0019] Fundamental sealing improvement: The seal no longer depends on the force and angle of the user's rotation of the handle, but is ensured by the powerful and uniform downward pressure generated by the system's hydraulic pressure. The powder bowl sealing ring at the lower end of the moving chamber is firmly pressed against the upper edge of the powder bowl, forming an extremely reliable seal. The probability of water leakage during high-pressure extraction is greatly reduced, improving the stability and safety of the extraction process.

[0020] Reduced requirements for user tamping technique: The downward pressing process of the moving chamber itself pre-compacts the coffee puck. This allows the puck to be initially compacted even if the user does not perform a very standard tamping operation, which helps reduce channeling effects, improves extraction uniformity, is more user-friendly for novice users, and simplifies the operation process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of a coffee machine according to Embodiment 1 of the present invention; Figure 2 This is a partial perspective view of a coffee machine according to Embodiment 1 of the present invention; Figure 3 This is a perspective view of a hydraulic brewing head structure according to Embodiment 1 of the present invention; Figure 4 This is an exploded view of a hydraulic brewing head structure according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the optional fixed outer wall configuration in Embodiment 1 of the present invention; Figure 6 This is a perspective view of the coffee handle according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the water circuit of a hydraulic brewing head structure according to Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the hydraulic brewing head structure in its initial hydraulic state according to Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the hydraulic brewing head structure in the extraction state according to Embodiment 1 of the present invention; Figure 10 This is a perspective view of the shaft core assembly according to Embodiment 1 of the present invention; Figure 11 This is a perspective view of the cavity sealing ring according to Embodiment 1 of the present invention.

[0023] In the picture: 1-Fixed outer wall; 1A-Two-ear fixed outer wall; 11-Outer wall; 12-Card holder; 13-Fixed pressure plate; 14-Interlocking structure; 1B-Three-ear fixed outer wall; 2-Moving part; 21-Cavity sealing ring; 22-Powder cup sealing ring; 3-Hydraulic cavity; 4-Shaft assembly; 5-Water distribution network; 6-Reset element; 7-Locking element; 8-Two-way valve; 81-First interface; 9-T-connector; 91-First interface; 92-Second interface; 93-Third interface; 10-Wastewater tray; 111-First solenoid valve; 112-Second solenoid valve; 100-Coffee handle; 101-Powder cup; 102-Ear. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1 This embodiment provides a coffee machine, such as Figures 1-11As shown, the coffee machine includes a hydraulic brewing head structure at the machine head. The piping and circuitry of the hydraulic brewing head structure are omitted in some of the attached drawings. The hydraulic brewing head structure includes a fixed outer wall 1, which forms the main support structure of the brewing head; a movable part 2, which is movably disposed inside the fixed outer wall 1, forming a sealed hydraulic cavity 3 between the movable part 2 and the fixed outer wall 1; a shaft assembly 4, which passes through the movable part 2; the upper end of the shaft assembly 4 is connected to an external hot water source; the lower end of the shaft assembly 4 is connected to the coffee bowl 101; and a reset element 6, which provides an elastic force to reset the movable part 2 upward. The hydraulic cavity 3 is configured such that when pressurized liquid is introduced, it drives the movable part 2 to move downward to press the coffee bowl 101 of the coffee handle 100 located below it. The pressurization action of the hydraulic cavity 3 and the liquid extraction action of the shaft assembly 4 are linked and controlled. Only when the movable part 2 is pressed down to the upper edge of the coffee bowl 101 to form an effective seal can the external hot water source deliver extraction water to the coffee bowl 101 through the shaft assembly 4. The core technology of this embodiment lies in providing an innovative hydraulic brewing head structure, aiming to systematically solve two prominent technical problems faced by existing coffee machines: firstly, poor compatibility due to differences in key dimensions between different brands of coffee portafilters; and secondly, easy leakage during the extraction process due to poor sealing. This solution introduces a dynamic hydraulically driven sealing mechanism, achieving adaptive compatibility with diverse portafilters and stable and reliable sealing under high pressure. The hydraulic brewing head includes a fixed outer wall, which forms a rigid mounting base for the entire brewing head on the coffee machine body. Inside the fixed outer wall, a movable component is provided, forming a seal between the outer periphery of this component and the inner wall of the fixed outer wall, thus creating a closed hydraulic chamber that can move vertically. A shaft assembly is located through the center of this movable component; the upper end of this assembly is connected to an external hot water source, and the lower end is used to distribute hot water to the portafilter's container. Furthermore, a reset element, such as a spring, is provided to provide elastic force to reset the movable component after hydraulic release. The process of solving the technical problem with this structure begins in the initial state, when the hydraulic chamber is not pressurized. Under the action of the reset element, the moving part and the shaft assembly fixed to it are in the initial position at the top, which provides ample vertical space for the installation of the handle. The key to this design is that, regardless of the thickness of the handle's "ears" (the protrusions used to engage with the coffee machine) or the vertical distance from the "ears" to the top edge of the portafilter, the installation process is not hindered by the vertical movement of the moving part, thus achieving broad horizontal compatibility.Once the handle is in place, the system introduces pressurized fluid (usually hot water) into the hydraulic chamber. The fluid pressure acts on the moving part, generating a downward driving force. This force overcomes the resistance of the reset element, driving the moving part downwards until the sealing ring at the lower end of the moving part is tightly pressed against the upper edge of the portafilter bowl. This "pressing" action is the core mechanism for achieving adaptive sealing in this design. It replaces the traditional method of relying on the user to manually rotate the handle to generate pre-tightening force, transforming it into a powerful and uniform automatic pressing process controlled by the system's hydraulic pressure. This ensures the absolute reliability of the sealing interface during subsequent high-pressure extraction. After the moving part is pressed into place and forms a seal, the water system guides the pressurized fluid to the spindle assembly, beginning the formal coffee extraction process. After extraction, the hydraulic chamber is depressurized, and the reset element pushes the moving part back to its initial position, completing one work cycle. In summary, this invention, through a clever hydraulic drive structure, designs the core functional components of the brewing head as a movable unit that can be pressed down as a whole. On the one hand, its stroke absorbs the dimensional tolerances of different handles to achieve adaptive compatibility; on the other hand, the powerful and constant downward pressure generated by hydraulic pressure ensures reliable sealing. Thus, it fundamentally and comprehensively solves the two long-standing technical problems of poor handle compatibility and leakage during extraction. Furthermore, the hydraulic brewing head structure reduces the user's tamping steps; the user only needs to distribute the coffee grounds in the portafilter, as tamping is done automatically during the hydraulic process. Overall, the product of this embodiment makes it very easy for users to screw on and off the coffee handle, allowing for extraction with just the handle screwed on, providing a great experience for those with less strength.

[0026] Preferably, the lower end of the shaft assembly 4 is further provided with a water distribution screen 5. When pressurized liquid is introduced, the driving movable part 2, together with the water distribution screen 5, moves downward. The water distribution screen is a key component located at the end of the brewing head, used to disperse the concentrated inflow of water into a uniform water curtain. In this preferred embodiment, the water distribution screen is fixed to the lower end of the movable part, forming a synchronously moving whole with the movable part. First, this structure ensures the stability of the relative position between the water distribution screen and the coffee pot. When the movable part is pressed down to seal with the coffee pot, a preset, uniform gap is maintained between the water distribution screen and the coffee puck. This lays the physical foundation for the uniform penetration of hot water into the coffee puck, helping to improve the uniformity of extraction. Secondly, and more importantly, at the end of the downward stroke of the moving part, the water distribution net will first contact the coffee grounds and exert a slight pre-compression effect on the grounds. This "pre-compression" action can, to some extent, compensate for the uneven force or uneven grounds that may occur when manually tamping the coffee, making the coffee puck density more uniform. This effectively reduces the "channel effect" (i.e., hot water preferentially passes through the path with the least resistance, resulting in uneven extraction), improves the quality stability of coffee extraction, and increases the tolerance for errors in the user's operating skills.

[0027] Preferably, the outer periphery of the movable part 2 is provided with a cavity sealing ring 21 to achieve a seal between the movable part 2 and the fixed outer wall 1, thereby forming a closed hydraulic cavity 3. The cavity sealing ring (usually adapted to the structure of the contact between the movable part and the fixed outer wall) is an elastic sealing element set in the groove on the outer periphery of the movable part. The elastic deformation of the sealing ring fills the mating gap between the movable part and the fixed outer wall. This scheme is preferred because it cleverly solves the contradiction between dynamic sealing and low-friction movement. While ensuring the formation of a closed hydraulic cavity between the movable part and the fixed outer wall, the cavity sealing ring allows the movable part to slide smoothly up and down along the inner wall of the fixed outer wall under hydraulic action (i.e., dynamic sealing). This sealing method has a simple and reliable structure, can effectively withstand the continuous high pressure in the hydraulic cavity, prevents the leakage of pressurized fluid, and thus ensures that the hydraulic energy is efficiently and without loss converted into the mechanical power to drive the movable part downward.

[0028] Preferably, the cross-sectional structure of the cavity sealing ring 21 is groove-shaped, with the outer side higher than the inner side. The contact structure between the cavity sealing ring 21 and the moving part and the fixed outer wall is an interference fit. The advantage of this structure is that when hot water enters the hydraulic cavity, it flows out from the center and gradually fills the cavity sealing ring from the bottom to the top. When the hydraulic cavity is full of water, the pressure is directed outwards, which is equivalent to applying the water pressure to the cavity sealing ring to push it outwards. The interference fit enhances the sealing effect.

[0029] Preferably, the shaft core assembly 4 is fixedly connected to the water distribution screen 5 via a locking member 7, which axially confines the movable part 2 within it. Specifically, the locking member can be a screw screwed into the threaded hole at the lower end of the shaft core assembly from the bottom center of the water distribution screen. This locking member rigidly connects the water distribution screen to the shaft core assembly, while the upper surface of the water distribution screen (or through an intermediate washer) and the shaft shoulder on the shaft core assembly, etc., clamp and confine the movable part within a defined axial space. This solution is preferred because it firmly combines the movable part, shaft core assembly, and water distribution screen into a rigid module that can move synchronously. This design ensures good consistency of the entire moving assembly under hydraulic drive, avoiding relative displacement or loosening between internal parts, and improving the reliability and lifespan of the structure. At the same time, this assembly method facilitates disassembly and maintenance. For example, when it is necessary to replace the sealing ring or clean the water distribution screen, the entire module can be disassembled simply by removing the locking member, simplifying the maintenance process.

[0030] Preferably, the system also includes a two-way valve 8. The first port 81 of the two-way valve 8 is connected to an external hot water source. The two-way valve 8 is configured to open when the pressure in the hydraulic chamber 3 reaches a first preset value, allowing liquid to flow to the shaft assembly 4; and close when the pressure in the hydraulic chamber 3 is lower than a second preset value. This solution is a preferred solution for automatic water circuit switching control. It introduces a two-way valve as the core control element, greatly improving the automation level and reliability of the system. A two-way valve is a valve that automatically changes its conduction direction based on the pressure difference between its two ends. In this solution, a conventional two-way valve is used, with an internal double-spring structure. The two-way valve is positioned on the water inlet path of the shaft assembly, and its opening and closing pressure thresholds are preset. This solution represents a significant improvement because it automates the workflow: In the initial stage, when the hydraulic chamber pressure is below a first preset value (i.e., the valve's opening pressure), the two-way valve closes, preventing pressurized fluid from flowing to the core assembly. The pressurized fluid is then preferentially injected into the hydraulic chamber through the existing water path to drive downward pressure. When the moving part is fully depressed and the hydraulic chamber pressure rises to the first preset value, the two-way valve automatically opens, switching the main water flow to the extraction water path of the core assembly. This process continues until the solenoid valve opens to release pressure, disrupting the balance. The water from the original outlet of the two-way valve returns to the wastewater pan via the same path. This design eliminates the need for additional electronic switches or complex mechanical linkages. The critical sequence of "pressurizing for sealing first, then injecting water for extraction" can be controlled solely by changes in the system's own hydraulic pressure. This fundamentally eliminates the risk of leakage caused by starting high-pressure extraction before the seal is fully established, making the system more intelligent and reliable.

[0031] Preferably, the system also includes a three-way connector 9, with the outlet end of the two-way valve 8 connected to the first interface 91 of the three-way connector 9, the second interface 92 of the three-way connector 9 connected to the water inlet end of the shaft assembly 4, and the third interface 93 of the three-way connector 9 connected to the wastewater tray 10. The three-way connector is a pipe connection element with three interfaces. Specifically, the two-way valve, the extraction water path, and the pressure relief pipeline are connected through this three-way connector. The advantages of this solution are: First, it simplifies the connection of external pipelines, concentrating all key water path interfaces on one component, facilitating quick docking with the main piping of the coffee machine, improving assembly efficiency, and reducing potential leakage points. Second, connecting the third interface to the wastewater tray provides an additional pressure relief path for the system; for example, pressure can be released through this interface during abnormal conditions or maintenance, enhancing system safety. This integrated design improves the integrity and maintainability of the entire brewing head module.

[0032] Preferably, the system also includes a pressure relief line, which is controlled by a solenoid valve to release liquid pressure. The pressure relief line is a dedicated pipe connecting the hydraulic chamber and / or extraction water path to the wastewater tray. This is achieved by controlling the opening and closing of the line with a solenoid valve. This solution is preferred because it provides an active and rapid reset control mechanism. After extraction, the control system sends a signal to the solenoid valve to open it, instantly opening the pressure relief line and rapidly releasing the pressurized liquid in the hydraulic chamber to the wastewater tray, causing a sharp pressure drop. This allows the reset spring to immediately and effectively push the moving parts back to their original position, preparing for the next brewing cycle. Compared to relying on slow natural leakage or complex mechanical pressure relief mechanisms, the electronically controlled pressure relief responds quickly and accurately, ensuring the efficiency and consistency of the brewing head's working cycle.

[0033] Specifically, the pressure relief pipeline includes a first pressure relief path and a second pressure relief path. The first pressure relief path connects the hydraulic chamber 3 to the wastewater tray, used to directly discharge the liquid in the hydraulic chamber 3. The second pressure relief path connects to the upper end of the shaft core assembly 4, used to discharge residual extraction water. The advantages of this design are: First, the parallel dual-path pressure relief is more efficient, ensuring rapid pressure release in the hydraulic chamber while promptly draining residual water from the extraction pipeline, preventing dripping or affecting the flavor of the next cup of coffee. Second, this design helps maintain the cleanliness and dryness of the brewing head, reducing the possibility of bacterial growth and improving the hygiene performance of the equipment. This is a significant improvement to the basic pressure relief function.

[0034] Preferably, the lower end of the movable part 2 is provided with a portafilter sealing ring 22, which forms a sealing contact with the upper edge of the portafilter 101 of the coffee portafilter 100 when the movable part 2 moves into position. The portafilter sealing ring is an annular seal on the lower end face of the movable part, usually made of high-temperature resistant, highly elastic materials such as silicone. When the movable part is hydraulically pressed into position, the sealing ring is squeezed and deformed against the upper edge of the portafilter of the coffee portafilter, forming a tight sealing interface. Unlike traditional coffee machines that rely on the user to manually rotate the portafilter to tighten the sealing ring, the huge hydraulic driving force in this solution ensures that the sealing ring can be evenly pressed against the edge of the portafilter with a pressure far exceeding manual capability. This powerful, system-applied sealing force can effectively resist internal extraction pressures of up to 9 bar or even higher, greatly reducing the risk of high-pressure hot water leakage from the interface.

[0035] Preferably, the lower part of the fixed outer wall 1 is provided with a locking structure 14 for engaging with the ears 102 of the coffee handle 100. The locking structure is a mechanism fixed to the lower part of the brewing head and used to engage with the ears (protrusions on both sides of the handle). Specifically, a standard interface (such as a 58 mm diameter bayonet) is used to ensure that handles from different brands can be smoothly mounted at different horizontal rotation angles. The above structure, combined with the vertical adaptive capability provided by hydraulic drive, constitutes a complete handle compatibility solution. The locking structure solves the problem of handle positioning and initial fixation in the horizontal plane, providing a stable foundation for the subsequent vertical pressing of moving parts. This combination design of "horizontal direction relying on universal mechanical locking and vertical direction relying on hydraulic adaptive pressing" is the fundamental reason why this invention can be widely compatible with mainstream handles on the market, realizing the significant advantage of "one machine adapting to multiple handles".

[0036] Preferably, the engagement structure of the brewing head is available in two-ear and three-ear versions. In this embodiment, specifically, the fixed outer wall 1 is assembled from an outer wall 11, a retainer 12 (which can be replaced with a two-ear or three-ear engagement structure), and a fixing plate 13, forming a replaceable two-ear fixed outer wall 1A and a three-ear fixed outer wall 1B. Specifically, the outer wall 11 is fitted inside the retainer 12 and secured by the fixing plate at the top and machine screws. The fixing plate at the top is made of stainless steel to ensure the safety of the brewing head, and the retainer 12 is made of aluminum alloy. Since the engagement structure 14 is located on the retainer 12, the conversion between two-ear and three-ear configurations can be achieved simply by changing the retainer. Figure 5 As shown, two-ear fixed outer walls 1A and three-ear fixed outer walls 1B are obtained respectively.

[0037] The basic working principle of each water channel in the hydraulic brewing head structure of this embodiment is as follows: Water circuit 1: After hot water comes out of the boiler, due to the back pressure of the two-way valve 8, the first solenoid valve 111 and the second solenoid valve 112 are closed, and the water first enters the hydraulic chamber 3 of the hydraulic cooking head structure. After the water fills the hydraulic chamber 3, it pushes the moving part 2 to move downward. Waterway 2: After the movable part 2 is pushed into place, hot water breaks through the pressure of the two-way valve and enters the core assembly 4 to extract and make coffee; Water circuit 3: After extraction, the first solenoid valve 111 and the second solenoid valve 112 are opened, and the water in the hydraulic chamber 3 flows back to the four-way valve and flows into the wastewater tray 10 from the first solenoid valve 111. Water circuit 4: After extraction, the first solenoid valve 111 and the second solenoid valve 112 are opened. A portion of the water flowing into the shaft core assembly 4 returns to the front end through the two-way valve 8 and is depressurized by the water circuit 3. The remaining pressurized water is reset by the reset element 6 and discharged through the second solenoid valve 112.

[0038] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A hydraulic brewing head structure, characterized in that, include: The outer wall (1) is fixed, forming the main support structure of the brewing head; The movable part (2) is movably disposed inside the fixed outer wall (1), and a closed hydraulic cavity (3) is formed between the movable part (2) and the fixed outer wall (1). A shaft core assembly (4) passes through a movable part (2), the upper end of the shaft core assembly (4) is connected to an external hot water source, and the lower end of the shaft core assembly (4) is connected to a powder bowl (101); The reset element (6) provides an elastic force that causes the movable element (2) to return to its original position. The hydraulic chamber (3) is configured such that when pressurized liquid is introduced, the movable part (2) is driven to move downward to press the coffee portafilter (101) located below it. The pressurization action of the hydraulic chamber (3) and the liquid extraction action of the shaft core assembly (4) are linked and controlled. Only when the movable part (2) is pressed down to the upper edge of the powder bowl (101) to form an effective seal, the external hot water source will deliver extraction water to the powder bowl (101) through the shaft core assembly (4).

2. The hydraulic brewing head structure according to claim 1, characterized in that: The lower end of the shaft core assembly (4) is also provided with a water distribution net (5). When pressurized liquid is introduced, it drives the movable part (2) and the water distribution net (5) to move downward.

3. The hydraulic brewing head structure according to claim 1, characterized in that: The outer periphery of the movable part (2) is provided with a cavity sealing ring (21) to achieve a seal between the movable part (2) and the fixed outer wall (1) to form a closed hydraulic cavity (3).

4. The hydraulic brewing head structure according to claim 1, characterized in that: It also includes a two-way valve (8), the first port (81) of which is connected to an external hot water source. The two-way valve (8) is configured to open when the pressure in the hydraulic chamber (3) reaches a first preset value, allowing liquid to flow to the shaft assembly (4); and close when the pressure in the hydraulic chamber (3) is lower than a second preset value.

5. The hydraulic brewing head structure according to claim 4, characterized in that: It also includes a three-way connector (9), the outlet end of the two-way valve (8) is connected to the first interface (91) of the three-way connector (9), the second interface (92) of the three-way connector (9) is connected to the water inlet end of the shaft core assembly (4), and the third interface (93) of the three-way connector (9) is connected to the wastewater pan (10).

6. The hydraulic brewing head structure according to claim 1, characterized in that: It also includes a pressure relief pipeline, which is controlled by a solenoid valve to release liquid pressure. The pressure relief pipeline includes a first pressure relief line and a second pressure relief line; The first pressure relief path connects the hydraulic chamber (3) to the wastewater pan, and is used to directly discharge the liquid in the hydraulic chamber (3); The second pressure relief path is connected to the upper end of the shaft core assembly (4) and is used to discharge residual extraction water.

7. The hydraulic brewing head structure according to claim 1, characterized in that: The lower end of the movable part (2) is provided with a powder bowl sealing ring (22), which is used to form a sealed contact with the upper edge of the powder bowl (101) of the coffee handle (100) when the movable part (2) moves down into place.

8. The hydraulic brewing head structure according to claim 1, characterized in that: The lower part of the fixed outer wall (1) is provided with a locking structure (14) for engaging with the ear (102) of the coffee handle (100).

9. The hydraulic brewing head structure according to claim 8, characterized in that: The fixed outer wall (1) is assembled from an outer wall (11) and a mounting base (12) that can be replaced by a two-ear snap-fit ​​structure or a three-ear snap-fit ​​structure, forming a replaceable two-ear fixed outer wall (1A) and a three-ear fixed outer wall (1B).

10. A coffee machine, characterized in that: It includes the hydraulic brewing head structure as described in any one of claims 1-9.

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