Coffee extraction device

Abstract

The invention relates to the technical field of coffee brewing appliances, in particular to a coffee extraction device which comprises a bearing structure and an extraction structure. The bearing structure is provided with a containing cavity with an opening in one side, and the extraction structure is arranged in the containing cavity of the bearing structure in a removable mode. The extraction structure comprises a filter part and an extrusion assembly, the filter part is connected to the end of the extrusion assembly, and the extrusion assembly is used for extruding coffee liquid to pass through the filter part. In the first state, the whole extraction structure is contained in the containing cavity. In the second state, the extraction structure is moved out of the containing cavity and located outside the bearing structure, and the extrusion assembly communicates with the containing cavity through the filtering piece. The coffee extraction device is small in size and convenient to carry, the use requirements in various scenes such as outdoor travel, camping and office work are met through the switching design of the first state and the second state, the user experience is improved, and coffee extraction is more flexible and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee brewing utensils, and in particular to a coffee extraction device. Background Art

[0002] Conventional coffee extraction devices are typically large and complex, limiting their use to fixed locations such as coffee shops, offices, or home kitchens. For example, a typical espresso machine requires a large space for installation and operation. Its bulk and complex piping not only occupy limited space but also restrict its applicability in various scenarios. Furthermore, these devices often require connection to a power or water source, further limiting their use.

[0003] Due to their size and limited usability, traditional coffee extraction devices are impractical for outdoor use, travel, or casual gatherings. This makes it difficult for coffee lovers to enjoy freshly brewed coffee in these situations, significantly limiting the occasions and frequency of coffee consumption. In our fast-paced modern lives, people increasingly seek convenient, anytime, anywhere experiences, but existing coffee extraction devices clearly cannot meet this demand. Summary of the Invention

[0004] The object of the present invention is to provide a coffee extraction device that is compact, easy to carry, and can extract coffee anytime and anywhere in a variety of scenarios.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A coffee extraction device, comprising:

[0007] A bearing structure, wherein the bearing structure is provided with a receiving chamber with an opening on one side;

[0008] The extraction structure includes a filter and an extrusion assembly. The filter is connected to the end of the extrusion assembly, and the extrusion assembly is used to squeeze the coffee liquid through the filter;

[0009] The extraction structure is removably disposed in the accommodating chamber of the supporting structure;

[0010] In the first state, the extraction structure is entirely accommodated in the accommodation chamber;

[0011] In the second state, the extraction structure is moved out of the accommodating chamber and is located outside the supporting structure, and the extrusion assembly is communicated with the accommodating chamber through the filter element.

[0012] Preferably, the bearing structure includes a cup body and a cup cover, the accommodating chamber is provided on the cup body, and the cup cover is threadedly connected to the cup body to seal the opening of the accommodating chamber.

[0013] Preferably, the side wall and the bottom wall of the cup body are both configured as a double-layer structure and the cup body is made of stainless steel.

[0014] Preferably, a limiting step is provided on the inner wall surface of the accommodating chamber close to the opening, and the edge of the filter element abuts against the limiting step.

[0015] Preferably, an exhaust hole is formed through the edge of the filter element.

[0016] Preferably, the extrusion assembly includes a piston and a piston cylinder. The interior of the piston cylinder is through-set, one end of the piston cylinder is connected to the filter element, and the piston is inserted from the other end of the piston cylinder and is slidably arranged in the piston cylinder.

[0017] Preferably, a sealing member is provided at the end of the piston inserted into the piston cylinder. When the piston is inserted into the piston cylinder, the sealing member is in close contact with the inner wall surface of the piston cylinder.

[0018] Preferably, the sealing member is detachably connected to the piston via a snap-fit ​​structure.

[0019] Preferably, the side wall of the piston cylinder is configured as a double-layer structure and the piston cylinder is made of stainless steel.

[0020] Preferably, the piston cylinder is threadedly connected to the filter element.

[0021] Compared with the prior art, the present invention has significant improvements:

[0022] In the first state of the coffee extraction device of the present invention, the extraction structure is housed in a receiving chamber on the supporting structure, making the device compact when not in use, easy to carry and store, and providing protection and sealing for the extraction structure. In the second state, the extraction structure is removed from the supporting structure and the extraction operation begins. Coffee powder and hot water are added to the extrusion assembly, and the coffee liquid is squeezed out by applying pressure. The coffee grounds and coffee liquid are filtered through a filter element to separate the coffee grounds and obtain pure coffee liquid. The extracted coffee liquid first flows into the receiving chamber, and the user can drink it directly or pour it into another container. The design of the transition between the first and second states meets the needs of use in various scenarios such as outdoor travel, camping, and office work, improves the user experience, and makes coffee extraction more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 is a schematic diagram of the external structure of a coffee extraction device according to an embodiment of the present invention;

[0025] Figure 2 is an exploded schematic diagram of the overall structure of a coffee extraction device according to an embodiment of the present invention;

[0026] Figure 3 is a schematic cross-sectional view of a coffee extraction device according to an embodiment of the present invention along the axial direction;

[0027] Figure 4 is a schematic cross-sectional view of a cup body of a coffee extraction device according to an embodiment of the present invention along the axial direction;

[0028] Figure 5 is an axonometric schematic diagram of a filter element of a coffee extraction device according to an embodiment of the present invention;

[0029] Figure 6 is a schematic cross-sectional view of a filter element of a coffee extraction device according to an embodiment of the present invention along the axial direction;

[0030] Figure 7 is a schematic cross-sectional view of the piston cylinder of the coffee extraction device according to an embodiment of the present invention along the axial direction;

[0031] Figure 8 is a schematic structural diagram of the coffee extraction device according to an embodiment of the present invention with the cup cover opened;

[0032] Figure 9 is a schematic structural diagram of the coffee extraction device according to an embodiment of the present invention after the extraction structure is removed from the cup body;

[0033] Figure 10 is a schematic structural diagram of the coffee extraction device according to an embodiment of the present invention, wherein the extrusion assembly is fastened to the cup body;

[0034] Figure 11 Schematic diagram of the structure of the coffee extraction device according to an embodiment of the present invention performing extraction operation through a pressing component.

[0035] Explanation of the accompanying drawings: 1-bearing structure; 11-accommodating chamber; 111-limiting step; 12-cup body; 13-cup cover; 2-extraction structure; 21-filter element; 211-edge portion; 212-exhaust hole; 22-extrusion assembly; 221-piston; 222-piston cylinder; 223-sealing element; 3-clamping structure; 31-clamping hook; 32-clamping groove; 4-sealing ring. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be implemented.

[0037] like Figures 1 to 11 FIG. 1 shows an embodiment of the coffee extraction device of the present invention.

[0038] See also Figures 1 to 3 The coffee extraction device of this embodiment includes a supporting structure 1 and an extraction structure 2.

[0039] The supporting structure 1 is provided with a accommodating chamber 11 with an opening on one side, and the extraction structure 2 is removably mounted within the accommodating chamber 11 of the supporting structure 1. The supporting structure 1 serves as the basic framework of the entire device. The accommodating chamber 11, with its opening on one side, allows the supporting structure 1 to function as a container or housing, supporting and accommodating the other components. The shape and dimensions of the accommodating chamber 11 match those of the extraction structure 2, ensuring its stable placement within the accommodating chamber 11. Since the extraction structure 2 can be fully accommodated within the accommodating chamber 11 of the supporting structure 1, the coffee extraction device is compact when not in use, making it easy to carry and store.

[0040] The extraction mechanism 2 includes a filter 21 and an extrusion assembly 22. The filter 21 is connected to the end of the extrusion assembly 22, which is used to force the coffee liquid through the filter 21. When extracting coffee, coffee grounds and hot water are added to the extrusion assembly 22. The extrusion assembly 22 applies pressure to squeeze the coffee liquid, which then passes through the filter 21 under pressure, filtering and separating the coffee grounds from the coffee liquid to produce pure coffee liquid. The filter 21 performs the filtering and separation functions, while the extrusion assembly 22 is the key component that provides power and pressure. The synergistic effect of the filter 21 and the extrusion assembly 22 enables efficient coffee extraction.

[0041] In the first state, the extraction structure 2 is entirely contained within the accommodating chamber 11, and the coffee extraction device of this embodiment is in the stored state. In the stored state, the extraction structure 2 is entirely contained within the accommodating chamber 11 of the supporting structure 1. The entire coffee extraction device is compact, thus saving space. At the same time, the supporting structure 1 provides protection for the extraction structure 2, preventing the intrusion of dust and dirt. In the second state, the extraction structure 2 is removed from the accommodating chamber 11 and located outside the supporting structure 1. The extrusion assembly 22 is connected to the accommodating chamber 11 through the filter element 21, thereby switching to the operating state to begin the coffee extraction operation. The extracted coffee liquid first flows into the accommodating chamber 11, and the user can drink it directly or pour the coffee liquid into other containers. In the operating state, the user can conveniently fill the coffee powder, perform the extraction operation, and perform subsequent cleaning and maintenance. The conversion design between the first and second states allows the coffee extraction device of this embodiment to be adjusted according to different usage requirements.

[0042] For different application scenarios, such as when traveling or camping outdoors, the user can store the coffee extraction device of this embodiment in a backpack, quickly switch to the operating state after arriving at the destination, and enjoy freshly extracted coffee; in the office, the user can place the coffee extraction device of this embodiment in a drawer or cabinet, take it out for use when needed, and store it again after use to save space.

[0043] Thus, in the first state of the coffee extraction device of this embodiment, the extraction structure 2 is accommodated in the receiving chamber 11 on the supporting structure 1, making the coffee extraction device compact and easy to carry and store when not in use, while also providing protection and sealing for the extraction structure 2. In the second state, the extraction structure 2 is removed from the supporting structure 1 and the extraction operation begins. Coffee powder and hot water are added to the extrusion assembly 22, and the coffee liquid is squeezed out by applying pressure. After filtering and separating the coffee grounds and the coffee liquid through the filter element 21, pure coffee liquid is obtained. The extracted coffee liquid first flows into the receiving chamber 11, and the user can drink it directly or pour it into another container. The design of the transition between the first and second states meets the needs of use in various scenarios such as outdoor travel, camping, and office work, improves the user experience, and makes coffee extraction more flexible and convenient.

[0044] See also Figures 1 to 3Preferably, the supporting structure 1 includes a cup body 12 and a cup lid 13, the accommodating chamber 11 is provided on the cup body 12, and the cup lid 13 is threadedly connected to the cup body 12 to seal the opening of the accommodating chamber 11. The cup lid 13 and the cup body 12 are sealed by the threaded connection. When the cup lid 13 is tightened, the threads between the cup lid 13 and the cup body 12 fit tightly together, forming a sealed environment to prevent dust, moisture or other impurities from entering the accommodating chamber 11. The threaded connection also makes it easy for the user to easily unscrew the cup lid 13 to remove the extraction structure 2. The supporting structure 1 is designed in the style of a cup body 12 and a cup lid 13, which is convenient for the user to hold and carry. The user can easily put the coffee extraction device into a backpack, handbag or pocket and enjoy coffee anytime, anywhere. In order to further ensure the sealing effect between the cup body 12 and the cup lid 13, a sealing ring 4 is also provided between the cup body 12 and the cup lid 13 to ensure that the cup lid 13 can fully seal the opening of the accommodating chamber 11 through the sealing ring 4 after being tightened.

[0045] See also Figure 4 Preferably, the side walls and bottom walls of the cup body 12 are both set to a double-layer structure and the cup body 12 is made of stainless steel. A hollow interlayer is formed between the double-layer side walls and the double-layer bottom wall of the cup body 12, and the hollow interlayer is in a vacuum state. After the hollow interlayer of the double-layer structure is evacuated, since there are almost no air molecules in the vacuum environment, the conduction and convection of heat are effectively blocked, thereby greatly reducing heat loss and playing a role in heat preservation. By reducing heat loss, the insulation time of coffee in the cup body 12 can be extended, allowing users to enjoy hot coffee for a longer time. The cup body 12 is made of stainless steel, which has good strength, corrosion resistance and durability. The good strength can protect the cup body 12 from damage caused by external impact. At the same time, stainless steel is easy to clean and maintain, and users can easily clean the cup body 12 to keep the inside of the cup body 12 clean and hygienic.

[0046] See also Figure 3 and Figure 4 Preferably, a limiting step 111 is provided on the inner wall surface of the accommodating chamber 11 near the opening, and the edge 211 of the filter element 21 abuts against the limiting step 111. The limiting step 111 is formed by bending the inner wall surface of the accommodating chamber 11, and the limiting step 111 is arranged toward the opening of the accommodating chamber 11.

[0047] During the storage operation, the bottom end of the extrusion assembly 22, not connected to the filter element 21, is positioned toward the opening of the accommodating chamber 11 and inserted downward. At this point, the bottom end of the extrusion assembly 22 gradually approaches the bottom wall of the accommodating chamber 11 from the opening, while the top end of the extrusion assembly 22, connected to the filter element 21, gradually approaches the opening of the accommodating chamber 11 from the outside. Ultimately, the edge 211 of the filter element 21 forms a retaining contact with the retaining step 111, allowing the extraction structure 2 to be fully accommodated within the accommodating chamber 11.

[0048] During the extraction operation, the extraction structure 2 is first removed from the accommodating chamber 11, and then the top of the extrusion assembly 22 connected to the filter 21 is inserted downwardly toward the opening of the accommodating chamber 11. At this time, relative to the storage operation, the extrusion assembly 22 and the filter 21 are reversed 180 degrees. When the edge 211 of the filter 21 forms a limiting abutment with the limiting step 111, the top of the extrusion assembly 22 is located at the opening of the accommodating chamber 11, and the extrusion assembly 22 is connected to the accommodating chamber 11 through the filter 21. The other parts of the extrusion assembly 22 are located outside the accommodating chamber 11, making it convenient for the user to add coffee powder and hot water to the extrusion assembly 22 and perform the extrusion operation. The edge 211 of the filter 21 forms a limiting abutment with the limiting step 111, which can effectively prevent the extrusion assembly 22 from shifting during the extrusion operation, thereby stably extracting coffee.

[0049] See also Figure 5 and Figure 6 Preferably, vent holes 212 are formed through the edge portion 211 of the filter element 21. Multiple vent holes 212 are provided, and are evenly distributed along the circumference of the filter element 21. During the extraction operation, the extrusion assembly 22 forms a sealed chamber for squeezing the coffee powder and hot water, while the opening of the receiving chamber 11 is also blocked by the filter element 21. At this time, the receiving chamber 11 is connected to the outside world through the vent holes 212 in the filter element 21. During the extrusion operation, the coffee liquid is squeezed and filtered through the filter element 21 before entering the receiving chamber 11. Gas in the receiving chamber 11 is discharged to the outside world through the vent holes 212, thereby preventing gas accumulation in the receiving chamber 11 from creating significant resistance to the extrusion operation. Providing vent holes 212 on the edge portion 211 of the filter element 21 allows for a smoother extrusion operation and completes coffee extraction.

[0050] See also Figure 2 、 Figure 3 and Figure 7Preferably, the extrusion assembly 22 includes a piston 221 and a piston cylinder 222. The piston cylinder 222 is provided with a continuous interior. One end of the piston cylinder 222 is connected to the filter element 21, and the piston 221 is inserted from the other end of the piston cylinder 222 and slidably disposed within the piston cylinder 222. The piston 221 and the filter element 21 respectively seal both ends of the piston cylinder 222, forming a sealed chamber within the piston cylinder 222 for extruding and extracting the coffee powder and hot water. The piston 221 slides within the piston cylinder 222, applying uniform pressure to the coffee powder and hot water, thereby achieving efficient and stable coffee extraction. To perform the extraction operation, the piston 221, piston cylinder 222, and filter element 21 are first removed from the cup body 12. The top end of the piston cylinder 222 connected to the filter element 21 is then engaged with the opening of the accommodating chamber 11. The piston 221 is then withdrawn from the piston cylinder 222, opening the bottom end of the piston cylinder 222. Add coffee powder and hot water from the bottom end of the piston cylinder 222, then insert the piston 221 into the piston cylinder 222 from the bottom end of the piston cylinder 222, apply external force to continuously push the piston 221 downward, and under the action of pressure, the coffee liquid in the piston cylinder 222 is filtered through the filter element 21 and enters the accommodating chamber 11 of the cup body 12, completing the collection of the extracted coffee liquid.

[0051] In this embodiment, the piston cylinder 222 is preferably threadedly connected to the filter element 21. One end of the piston cylinder 222 is provided with external threads, and the filter element 21 is provided with matching internal threads. Through the engagement of the threads, the piston cylinder 222 and the filter element 21 are tightly connected together, forming a single unit. This threaded connection provides a good seal, preventing coffee liquid from leaking from the connection between the piston cylinder 222 and the filter element 21 during the extraction process, thereby ensuring a stable extraction process. Furthermore, by loosening the threads, the piston cylinder 222 and the filter element 21 can be separated, allowing the user to easily replace or clean the piston cylinder 222 and the filter element 21.

[0052] See also Figure 2 and Figure 3 Preferably, a seal 223 is provided at the end of the piston 221 inserted into the piston cylinder 222. When the piston 221 is inserted into the piston cylinder 222, the seal 223 tightly abuts the inner wall of the piston cylinder 222. As the piston 221 slides within the piston cylinder 222, the seal 223 is squeezed by the inner wall of the piston cylinder 222 and elastically deforms, thereby tightly fitting the inner wall of the piston cylinder 222. This prevents leakage of coffee liquid and gas in the piston cylinder 222 from the contact between the inner wall of the piston cylinder 222 and the seal 223, thereby ensuring effective coffee extraction. The seal 223 is preferably made of silicone. The elastic properties of the silicone material enable the seal 223 to maintain good sealing performance under different pressure and temperature conditions.

[0053] See also Figure 3Preferably, the sealing member 223 is detachably connected to the piston 221 through a clamping structure 3. In this embodiment, the clamping structure 3 comprises a clamping hook 31 and a clamping groove 32. The edge of one end of the piston 221 is inwardly folded to form a ring-shaped clamping hook 31, and the sealing member 223 is provided with a ring-shaped clamping groove 32, and the clamping hook 31 can be inserted into the clamping groove 32 and clamped. The cooperation of the clamping hook 31 and the clamping groove 32 can provide stable connection and ensure that the sealing member 223 will not be loose during the sliding process of the piston 221. At the same time, the clamping structure 3 allows the sealing member 223 to be quickly installed and detached, which is convenient for users to replace or clean.

[0054] Referring to Figure 7 Preferably, the side wall of the piston cylinder 222 is provided with a double-layer structure, and the piston cylinder 222 is made of stainless steel material. The double-layer side wall of the piston cylinder 222 forms a hollow interlayer, and the hollow interlayer is in a vacuum state. The intermediate interlayer in a vacuum state can effectively reduce the heat loss of the hot water added into the piston cylinder 222, prolong the heat preservation time of the hot water, and thus ensure that the extraction temperature of the coffee meets the requirements. At the same time, the piston cylinder 222 made of stainless steel material has a smooth surface, which is easy to clean and maintain, thereby ensuring the quality of the coffee after extraction.

[0055] Referring to Figures 8 to 11 The use process of the coffee extraction device of this embodiment is as follows:

[0056] Preparation stage

[0057] Open the cup cover 13: unscrew the cup cover 13, take off the cup cover 13 from the cup body 12, and expose the opening of the containing chamber 11.

[0058] Take out the extraction structure 2: take out the extraction structure 2, including the piston 221, the piston cylinder 222 and the filter member 21, from the containing chamber 11 of the cup body 12.

[0059] Extraction operation stage

[0060] Install the piston cylinder 222: buckle the top end of the piston cylinder 222 connected with the filter member 21 at the opening of the containing chamber 11, ensure that the edge part 211 of the filter member 21 forms a limiting abutment with the limiting step 111, and make the filter member 21 tightly fit with the opening of the containing chamber 11.

[0061] Add coffee powder and hot water: pull out the piston 221 from the piston cylinder 222, so that the bottom end of the piston cylinder 222 is opened, and then add coffee powder and hot water from the bottom end of the piston cylinder 222.

[0062] Insert the piston 221: insert the piston 221 from the bottom end of the piston cylinder 222, and ensure that the sealing member 223 tightly fits with the inner wall surface of the piston cylinder 222.

[0063] To perform the squeeze operation: Apply external force and continuously push the piston 221 downward. Under the pressure, the coffee liquid in the piston cylinder 222 is filtered through the filter element 21 and enters the receiving chamber 11 of the cup body 12. At this time, the gas in the receiving chamber 11 is discharged to the outside through the vent 212 in the filter element 21, preventing gas accumulation from forming resistance to the squeeze operation.

[0064] Completion of extraction: When the coffee liquid has completely passed through the filter 21 and entered the receiving chamber 11, the squeezing operation is stopped. At this point, the extracted coffee liquid has flowed into the receiving chamber 11, and the user can drink it directly or pour the coffee liquid into other containers.

[0065] Storage stage

[0066] Take out the extraction structure 2: pull the piston 221 out of the piston cylinder 222 so that the bottom end of the piston cylinder 222 is opened for easy cleaning.

[0067] Cleaning the extraction structure 2: Clean the piston 221, the piston cylinder 222 and the filter element 21 to ensure that the interior is clean and sanitary.

[0068] Reassemble the extraction structure 2: Insert the cleaned piston 221 into the piston cylinder 222, ensuring that the seal 223 fits tightly against the inner wall of the piston cylinder 222. Then reconnect the piston cylinder 222 to the filter element 21.

[0069] Accommodating the extraction structure 2 : placing the assembled extraction structure 2 as a whole into the accommodation chamber 11 of the cup body 12 , so that the extraction structure 2 is stably accommodated in the accommodation chamber 11 .

[0070] Close the cup cover 13: Tighten the cup cover 13 onto the cup body 12, ensuring that the threads between the cup cover 13 and the cup body 12 are tightly fitted to form a sealed environment to prevent dust, moisture or other impurities from entering.

[0071] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A coffee extraction device, characterized in that: include: A bearing structure (1), wherein the bearing structure (1) is provided with a receiving chamber (11) with an opening on one side; An extraction structure (2), the extraction structure (2) comprising a filter (21) and a pressing assembly (22), the filter (21) being connected to an end of the pressing assembly (22), the pressing assembly (22) being used to press coffee liquid through the filter (21); Wherein, the extraction structure (2) is removably arranged in the accommodating chamber (11) of the supporting structure (1); In the first state, the extraction structure (2) is entirely accommodated in the accommodation chamber (11); In the second state, the extraction structure (2) is moved out of the accommodating chamber (11) and is located outside the supporting structure (1), and the extrusion assembly (22) is connected to the accommodating chamber (11) through the filter element (21).

2. The coffee extraction device according to claim 1, wherein The bearing structure (1) comprises a cup body (12) and a cup cover (13); the accommodating chamber (11) is provided on the cup body (12); and the cup cover (13) is threadedly connected to the cup body (12) to seal the opening of the accommodating chamber (11).

3. The coffee extraction device according to claim 2, wherein: The side wall and the bottom wall of the cup body (12) are both configured as a double-layer structure, and the cup body (12) is made of stainless steel.

4. The coffee extraction device according to claim 1, wherein: A limiting step (111) is provided on the inner wall surface of the accommodating chamber (11) close to the opening, and the edge portion (211) of the filter element (21) abuts against the limiting step (111).

5. The coffee extraction device according to claim 4, characterized in that An exhaust hole (212) is provided through the edge portion (211) of the filter element (21).

6. The coffee extraction device according to claim 1, wherein: The extrusion assembly (22) includes a piston (221) and a piston cylinder (222). The interior of the piston cylinder (222) is through-connected. One end of the piston cylinder (222) is connected to the filter element (21). The piston (221) is inserted from the other end of the piston cylinder (222) and is slidably disposed in the piston cylinder (222).

7. The coffee extraction device according to claim 6, characterized in that The end of the piston (221) inserted into the piston cylinder (222) is provided with a sealing member (223). When the piston (221) is inserted into the piston cylinder (222), the sealing member (223) is in close contact with the inner wall surface of the piston cylinder (222).

8. The coffee extraction device according to claim 7, characterized in that The sealing member (223) is detachably connected to the piston (221) via a clamping structure (3).

9. The coffee extraction device according to claim 6, wherein: The side wall of the piston cylinder (222) is configured as a double-layer structure and the piston cylinder (222) is made of stainless steel.

10. The coffee extraction device according to claim 6, wherein: The piston cylinder (222) is threadedly connected to the filter element (21).

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