Portable coffee filter cup structure and Italian coffee machine thereof

Abstract

The utility model discloses a portable coffee filter cup structure and an Italian coffee machine thereof, and belongs to the technical field of coffee equipment, the portable coffee filter cup structure comprises a cup body with a filter cavity, a powder ejecting assembly is arranged in the filter cavity, and the powder ejecting assembly comprises a movable top plate and a supporting column arranged at the lower end of the movable top plate; the device further comprises an elastic element which is arranged on the supporting column in a sleeving mode. Through the synergistic effect of the movable top plate and the elastic element, self-adaptive adjustment of the stroke of the brewing net is achieved, the problem that powder is splashed when the powder amount is too small or blocked when the powder amount is too large is effectively solved, and extraction uniformity and stability are remarkably improved. Meanwhile, a mixing and filtering space is arranged, so that coffee liquid is roughly filtered, then secondarily mixed and finely filtered, full contact of grease and micro powder is promoted, and the purity and taste mellowness of the liquid are enhanced. In addition, after brewing is completed, the elastic element drives the movable top plate to automatically reset, the linkage structure promotes the powder residues to be rapidly separated from the inner wall of the filter cavity, and the powder residues are convenient to clean.

Description

Technical Field

[0001] This utility model belongs to the field of coffee equipment technology, specifically relating to a portable coffee filter cup structure and its espresso machine. Background Technology

[0002] With the fast pace of life and upgrading consumer demands, portable coffee machines have become an important member of modern family kitchen appliances due to their lightweight design, quick operation, and easy storage. They not only meet users' immediate need for freshly ground coffee but also optimize the user experience through designs such as detachable filter cups and modular components. However, the filter cup structure of existing portable coffee machines still faces many technical bottlenecks: for example, insufficient adaptability to different coffee powder amounts leading to poor extraction stability, a single filter layer affecting coffee quality, and inconvenient grounds cleaning. These problems directly restrict users' pursuit of coffee taste and the convenience of daily use.

[0003] In the prior art, Chinese patent CN204797591U discloses a semi-automatic coffee machine that simplifies the coffee-making process through a combination of a detachable water collection tank, a filter bowl, and a portafilter. Specifically, this design incorporates a filter bowl within the portafilter and utilizes a filter screen for basic liquid-solid separation, while a detachable water collection tank collects coffee grounds. However, this design suffers from several significant drawbacks: First, the filter cup is a fixed structure with a fixed filter screen position, making it difficult to adjust the tamping stroke according to the amount of coffee grounds. When the amount of coffee grounds is small, the gap between the tamping screen and the coffee grounds is too large, causing coffee grounds to splatter under high pressure, resulting in uneven extraction. Conversely, when the amount of coffee grounds is large, the tamping screen, limited by its fixed stroke, cannot be fully pressed down, easily leading to localized overpressure or even blockage. Second, the filter cup uses only a single-layer filter screen, meaning the coffee liquid only undergoes one filtration before flowing out directly, resulting in insufficient separation of oils and fine powders, and a lack of richness in the coffee's flavor. Furthermore, coffee grounds require manual tapping or tilting at a specific angle to detach from the filter cup, making the process cumbersome and prone to residue buildup. Although some improvement solutions attempt to enhance filtration by optimizing the water path or increasing the filter density, they still fail to address core issues such as insufficient adaptability of the filter cup to the amount of coffee powder and lack of stratified filtration in the liquid path, making it difficult to balance coffee quality with ease of use for users. Summary of the Invention

[0004] In response to the problems in related technologies, this utility model proposes a portable coffee filter cup structure and its espresso machine to solve the technical problems of insufficient adaptability of existing filter cups to the amount of coffee powder and lack of liquid stratification filtration.

[0005] The technical solution of this utility model is implemented as follows: a portable coffee filter cup structure includes a cup body with a hollow filter cavity, and a powder inlet is provided at the upper end of the cup body. The powder inlet is connected to the filter cavity, and the powder to be extracted enters the filter cavity through the powder inlet.

[0006] The filter chamber is equipped with a top powder assembly, which includes a movable top plate and a support column located at the lower end of the movable top plate; the support column is slidably connected to the bottom of the filter chamber, and the circumferential edge of the movable top plate slides against the inner wall of the filter chamber; the powder to be extracted is isolated on the upper surface of the movable top plate; it also includes an elastic element, which is sleeved on the support column to provide a pre-tightening force to the movable top plate away from the bottom of the filter chamber;

[0007] At least one first filter screen is provided in the middle of the movable top plate from top to bottom, and a second filter screen is provided at the bottom of the filter chamber. A mixing space is formed between the movable top plate and the bottom of the filter chamber. The extracted liquid passes through each of the first filters in sequence, flows into the mixing space, and then flows out after being filtered by the second filter screen.

[0008] This invention utilizes the synergistic effect of a movable top plate and an elastic element to achieve adaptive adjustment of the brewing net's stroke, effectively preventing splashing when there is too little coffee grounds or clogging when there is too much, significantly improving extraction uniformity and stability. Simultaneously, the inclusion of a mixing and filtration space allows the coffee liquid to undergo coarse filtration, secondary mixing, and then fine filtration, promoting full contact between the oils and fine powders, enhancing liquid purity and flavor richness. Furthermore, after brewing, the elastic element drives the movable top plate to automatically reset, and its linkage structure facilitates rapid separation of coffee grounds from the filter chamber wall, making cleaning easier and improving the user experience.

[0009] As a further improvement to the above solution, the movable top plate includes a top plate body, the first filter screen is provided in the middle of the top plate body, and a flexible partition ring is provided on the circumferential edge of the top plate body. The flexible partition ring extends obliquely upward and abuts against the cavity wall of the cup filter cavity; the top plate body and the flexible partition ring form an upward-opening disc structure.

[0010] As a further improvement to the above solution, the filter cavity is provided with a narrow cavity that gradually narrows towards the bottom; when the movable top plate moves downward, the narrow cavity acts on the flexible spacer ring and deforms it, and the opening of the disc-shaped structure shrinks accordingly.

[0011] The flexible septum extends obliquely upwards and dynamically conforms to the filter chamber wall, forming a sealed isolation zone that effectively prevents coffee powder from migrating to the filter chamber sidewalls. During tamping, the flexible septum adapts to the displacement of the movable top plate, preventing powder from becoming embedded in the gap between the movable top plate and the chamber wall, thus avoiding residue, and ensuring that the extract flows strictly along the preset liquid path, preventing high-pressure water leakage from the sidewalls and causing uneven extraction. The disc-shaped structure further guides the powder to concentrate in the central area of ​​the top plate, improving tamping uniformity and micro-powder interception efficiency.

[0012] As a further improvement to the above solution, the circumferential edge of the main body of the top plate protrudes towards the bottom of the filter cavity, forming an annular boss. When the movable top plate descends and presses against the bottom of the filter cavity, the annular boss provides space for the compression of the elastic element at its opening. The annular boss, by protruding downwards to form an annular space, provides a directional compression area for the elastic element when the movable top plate presses down to the bottom of the filter cavity. The overhead structure can prevent the elastic element from being over-compressed and causing deformation failure, while maintaining a stable preload output.

[0013] As a further improvement to the above solution, both the first and second filter screens are provided with multiple filter holes; wherein, the pore size of the second filter screen is smaller than or equal to the pore size of the first filter screen. The first filter screen in the middle of the movable top plate and the second filter screen at the bottom of the filter chamber form a multi-stage filtration structure, requiring the coffee liquid to pass through the coarse filtration of the first filter screen and the fine filtration of the second filter screen in sequence. At the same time, the mixing space between the movable top plate and the bottom of the filter chamber provides a secondary mixing area for the coffee liquid. Incompletely extracted powder and oil come into full contact and redistribute in this space, avoiding oil loss or powder residue caused by single filtration. This not only enhances the body of the coffee liquid but also improves the purity of the liquid through layered filtration, making the coffee taste more delicate and full-bodied.

[0014] As a further improvement to the above solution, the support extends through the bottom of the filter chamber, and a limiting block is provided on the outside of the bottom of the filter chamber.

[0015] As a further improvement to the above solution, the support column is provided with a threaded hole along its axial direction, and the fastener passes through the movable top plate from top to bottom, engaging with the threaded hole of the support column; the limiting block protrudes along its circumference, forming a handle. The support column is connected to the fastener through the threaded hole, and the user only needs to rotate the handle to quickly assemble and disassemble the movable top plate without the need for special tools.

[0016] As a further improvement to the above solution, an outer cup shell is also included. The outer cup shell has a hollow accommodating cavity. The upper end of the outer cup shell is provided with a cup shell opening, and the lower end is provided with a dripping outlet. The accommodating cavity is connected to the cup shell opening and the dripping outlet respectively. The cup body is inserted into the accommodating cavity through the cup shell opening and is detachably connected to the outer cup shell.

[0017] As a further improvement to the above solution, the outer cup shell includes a cup holder, a heat insulation sleeve, and a flow guide cup;

[0018] The cup holder has the receiving cavity, and the side wall of the receiving cavity is provided with a retaining ring for disassembly and engagement with the cup body;

[0019] The heat insulation sleeve is fitted onto the outer periphery of the cup holder, with a heat insulation gap between them;

[0020] The guide cup is shaped like a bucket and placed at the bottom of the cup body; the side wall of the guide cup narrows in a stepped manner from top to bottom, and the bottom of the guide cup protrudes in a conical shape to form the drip outlet.

[0021] The outer cup shell is quickly detached from the cup body via a snap ring, facilitating user separation for cleaning or component replacement. The heat-insulating gap between the heat-insulating sleeve and the cup holder effectively blocks heat transfer, reducing heat loss during extraction and preventing external burns. The stepped narrowing sidewalls of the guide cup, along with the conical drip nozzle, work together to guide the coffee liquid to fall in a concentrated manner, preventing splashing or residue on the walls. Simultaneously, the funnel-shaped structure accelerates the convergence and outflow of liquid, ensuring a precise and controllable extraction path.

[0022] An espresso machine includes a portable coffee filter cup structure as described above, and a brewing net. The upper end of the brewing net is connected to a water supply mechanism, which supplies water to the filter chamber. The brewing net extends into the filter chamber to tamp coffee grounds, and a movable top plate is adapted to the lifting and lowering movement of the brewing net.

[0023] Beneficial effects:

[0024] (1) Adaptive tamping stroke design to improve extraction uniformity: Through the synergistic effect of the movable top plate and the elastic element, the automatic adjustment of the brewing net stroke is realized. When the amount of coffee powder is small, the pre-tightening force of the elastic element pushes the movable top plate upward, reducing the gap between the brewing net and the powder layer, and avoiding powder splashing caused by the impact of high-pressure water flow; when the amount of powder is large, the brewing net is pressed down, which reacts on the movable top plate and compresses the elastic element, ensuring uniform tamping force and no clogging, effectively solving the problem of uneven extraction caused by the fluctuation of powder amount in traditional fixed filter cups, and significantly improving the stability of coffee liquid quality.

[0025] (2) The combination of multi-layered filters and a mixing space optimizes the filtration effect of coffee liquid: The first filter in the middle of the movable top plate and the second filter at the bottom of the filter chamber form a multi-stage filtration structure. The coffee liquid needs to pass through the coarse filtration of the first filter and the fine filtration of the second filter in sequence. At the same time, the mixing space between the movable top plate and the bottom of the filter chamber provides a secondary mixing area for the coffee liquid. The unextracted powder and oil come into full contact and redistribute in this space, avoiding the loss of oil or powder residue caused by single filtration. This not only enhances the body of the coffee liquid, but also improves the purity of the liquid through layered filtration, making the coffee taste more delicate and full-bodied.

[0026] (3) The movable top plate linkage structure simplifies the powder residue cleaning process: After the brewing is completed, the pre-tightening force of the elastic element drives the movable top plate to reset and move upward. Its sliding connection structure with the bottom of the filter chamber causes the powder residue to automatically separate from the inner wall of the filter chamber. Users only need to tilt the filter cup, and the powder residue can be quickly removed without relying on knocking or tilting at a specific angle, which greatly reduces the probability of powder residue residue, reduces cleaning time, and avoids damage to the filter cup structure caused by external force operation, thus extending the product's service life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the filter cup of this utility model;

[0028] Figure 2 This is an exploded view of the filter cup of this utility model;

[0029] Figure 3 This is a cross-sectional view of the filter cup of this utility model;

[0030] Figure 4 This is a perspective view of the cup body of this utility model;

[0031] Figure 5 This is a schematic diagram of the working function of the filter cup of this utility model;

[0032] Figure 6 This is a schematic diagram showing the deformation of the flexible spacer ring of this utility model;

[0033] Figure 7 This is a perspective view of the Italian coffee machine of this utility model;

[0034] Figure label:

[0035] 1. Filter cup structure;

[0036] 11. Cup body; 11a. Powder inlet; 11b. Filter chamber; 11c. Narrow cavity section;

[0037] 12. Top powder component;

[0038] 121. Movable roof plate; 1211. Roof plate body; 1212. Flexible partition ring; 1213. Annular boss;

[0039] 122. Support column; 1221. Limiting block; 1222. Rotating handle;

[0040] 123. Elastic element;

[0041] 124. First filter screen;

[0042] 125. Second filter;

[0043] H1, filtration space; F1, powder;

[0044] 13. Outer cup shell; 13a. Cup shell opening; 13b. Receiving cavity; 13c. Dropping port;

[0045] 131. Cup holder; 1311. Handle clip;

[0046] 132. Heat insulation sleeve;

[0047] 133. Flow guide cup;

[0048] 2. Brewing net. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] In the description of this utility model, it should be understood that the term "several" means "at least one", and the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] Example:

[0052] like Figures 1-7 As shown, this embodiment provides a portable coffee filter cup structure, including a cup body 11 with a hollow filter cavity 11b. The upper end of the cup body 11 has a powder inlet 11a, which communicates with the filter cavity 11b. The powder to be extracted enters the filter cavity 11b through the powder inlet 11a. In this embodiment, it also includes an outer cup shell 13, which has a hollow receiving cavity 13b. The upper end of the outer cup shell 13 has a cup shell opening 13a, and the lower end has a drip outlet 13c. The receiving cavity 13b communicates with both the cup shell opening 13a and the drip outlet 13c. The cup body 11 is inserted into the receiving cavity 13b through the cup shell opening 13a and is detachably connected to the outer cup shell 13. Specifically, the outer cup shell 13 includes a cup holder 131, a heat insulation sleeve 132, and a guide cup 133. In this embodiment, the powder F1 can be coffee powder.

[0053] The cup holder 131 has the receiving cavity 13b, and the side wall of the receiving cavity 13b is provided with a retaining ring for disassembly and engagement with the cup body 11; the cup holder 131 protrudes along one side at the cup shell opening 13a end to form a retaining handle 1311; the retaining handle 1311 engages with a slot on the coffee machine.

[0054] The heat insulation sleeve 132 is fitted onto the outer periphery of the cup holder 131, and there is a heat insulation gap between the two.

[0055] The guide cup 133 is placed in the lower part of the cup body 11 in a bucket shape; the side wall of the guide cup 133 narrows in a stepped manner from top to bottom, and the bottom of the guide cup 133 protrudes in a conical shape to form the drip port 13c.

[0056] The outer cup shell 13 is quickly detached from the cup body 11 via a retaining ring, facilitating user separation for cleaning or component replacement. The heat insulation gap formed between the heat insulation sleeve 132 and the cup holder 131 effectively blocks heat transfer, reducing heat loss during extraction and preventing external burns. The stepped narrowing sidewall of the guide cup 133, together with the conical drip nozzle 13c, guides the coffee liquid to fall in a concentrated manner, preventing splashing or residue on the wall. At the same time, the funnel-shaped structure accelerates the convergence and outflow of liquid, ensuring a precise and controllable extraction path.

[0057] The filter chamber 11b is provided with a powder-topping assembly 12, which includes a movable top plate 121 and a support column 122 located at the lower end of the movable top plate 121. The support column 122 is slidably connected to the bottom of the filter chamber 11b, and the circumferential edge of the movable top plate 121 slidably abuts against the inner wall of the filter chamber 11b. The powder to be extracted is isolated on the upper surface of the movable top plate 121. It also includes an elastic element 123, which is sleeved on the support column 122 to provide a pre-tightening force to the movable top plate 121 away from the bottom of the filter chamber 11b. Specifically, the elastic element 123 can be a compression spring.

[0058] At least one first filter screen 124 is provided in the middle of the movable top plate 121 from top to bottom, and a second filter screen 125 is provided at the bottom of the filter cavity 11b. A mixing space H1 is formed between the movable top plate 121 and the bottom of the filter cavity 11b. The extracted liquid passes through each of the first filters 124 in sequence, flows into the mixing space H1, and then flows out after being filtered by the second filter screen 125.

[0059] In this embodiment, the movable top plate 121 includes a top plate body 1211, the first filter 124 is provided in the middle of the top plate body 1211, and a flexible partition ring 1212 is provided on the circumferential edge of the top plate body 1211. The flexible partition ring 1212 extends obliquely upward and abuts against the cavity wall of the filter chamber 11b of the cup body 11. The top plate body 1211 and the flexible partition ring 1212 form an upward-opening disc-shaped structure. The flexible partition ring 1212 can be made of silicone, which has good high temperature resistance and pressure resistance, and is suitable for the working environment of coffee machines.

[0060] In this embodiment, the filter cavity 11b is provided with a narrow cavity portion 11c that gradually narrows towards the bottom; when the movable top plate 121 moves downward, the narrow cavity portion 11c acts on the flexible spacer ring 1212 and causes it to deform, and the opening of the disc-shaped structure shrinks accordingly.

[0061] The flexible septum ring 1212 extends obliquely upwards and dynamically fits against the wall of the filter chamber 11b, forming a sealed isolation zone that effectively prevents coffee powder from migrating to the sidewall of the filter chamber 11b. During tamping, the flexible septum ring 1212 adaptively deforms with the displacement of the movable top plate 121, preventing powder from becoming embedded in the gap between the movable top plate 121 and the chamber wall, thus avoiding residue, and ensuring that the extract flows strictly along the preset liquid path, preventing high-pressure water from leaking from the sidewall and causing uneven extraction. The disc-shaped structure further guides the powder to concentrate in the central area of ​​the top plate, improving tamping uniformity and micro-powder interception efficiency.

[0062] In this embodiment, the circumferential edge of the top plate body 1211 protrudes towards the bottom of the filter cavity 11b, forming an annular boss 1213. When the movable top plate 121 descends and presses against the bottom of the filter cavity 11b, the annular opening of the annular boss 1213 provides space for the compression of the elastic element 123. The annular boss 1213 forms an annular space by protruding downwards, providing a directional compression area for the elastic element 123 when the movable top plate 121 presses down to the bottom of the filter cavity 11b. The overhead structure can prevent the elastic element 123 from being over-compressed and deformed, while maintaining a stable preload output.

[0063] In this embodiment, both the first filter screen 124 and the second filter screen 125 are provided with multiple filter holes; wherein, the pore diameter of the second filter screen 125 is smaller than or equal to the pore diameter of the first filter screen 124. In this embodiment, there can be two or three first filter screens 124, stacked vertically. The pore diameters of all first filter screens 124 are the same, or they can decrease from top to bottom.

[0064] The first filter screen 124 in the middle of the movable top plate 121 and the second filter screen 125 at the bottom of the filter chamber 11b form a multi-stage filtration structure. The coffee liquid needs to pass through the coarse filtration of the first filter screen 124 and the fine filtration of the second filter screen 125 in sequence. At the same time, the mixing space H1 between the movable top plate 121 and the bottom of the filter chamber 11b provides a secondary mixing area for the coffee liquid. The incompletely extracted powder and oil come into full contact and redistribute in this space, avoiding the loss of oil or powder residue caused by single filtration. This not only enhances the body of the coffee liquid, but also improves the purity of the liquid through layered filtration, making the coffee taste more delicate and full-bodied.

[0065] In this embodiment, the support column 122 extends through the bottom of the filter chamber 11b, and a limiting block 1221 is provided on the outer side of the bottom of the filter chamber 11b. Specifically, the support column 122 has a threaded hole along its axial direction, and a fastener passes through the movable top plate 121 from top to bottom and engages with the threaded hole of the support column 122; the limiting block protrudes along its circumference to form a handle portion 1222. The support column 122 is engaged with the fastener through the threaded hole, and the user only needs to rotate the handle portion 1222 to quickly assemble and disassemble the movable top plate 121 without the need for special tools.

[0066] This embodiment also provides an espresso machine, including a portable coffee filter cup structure as described above, and a brewing net. The upper end of the brewing net is connected to a water supply mechanism, which is used to supply water to the filter chamber 11b. The brewing net extends into the filter chamber 11b to tamp the coffee grounds, and the movable top plate 121 is adapted to the lifting and lowering movement of the brewing net.

[0067] In a specific application, using the above-described solution of this utility model: the user introduces coffee powder into the filter chamber 11b through the powder inlet 11a and spreads it evenly on the upper surface of the movable top plate 121, followed by water extraction. At this time, the brewing net extends into the filter chamber 11b to compress the powder, and the movable top plate 121 causes it to slide downward along the support column 122 and compress the elastic element 123. The travel of the brewing net is dynamically adjusted according to the amount of powder: when the amount of powder is small, the pre-tightening force of the elastic element 123 supports the movable top plate 121 to move upward, reducing the distance between the brewing net and the powder layer; when the amount of powder is large, the brewing net presses down on the movable top plate 121 to ensure that the compressing force is evenly distributed.

[0068] The extract sequentially penetrates the first filter screen 124 of the movable top plate 121 into the mixing filtration space H1. In this area, the incompletely extracted micro-powder mixes with the oil a second time, and then flows out after fine filtration through the second filter screen 125 at the bottom of the filter chamber 11b. After brewing, the elastic element 123 pushes the movable top plate 121 to return to its original position and move upward. The powder residue is lifted with the movable top plate 121 and detaches from the inner wall of the filter chamber 11b. The user can quickly clean the residue by gently pushing the movable top plate 121 or tilting the cup body 11.

[0069] This embodiment achieves adaptive adjustment of the brewing net's stroke through the synergistic action of the movable top plate 121 and the elastic element 123, effectively avoiding splashing when there is too little coffee powder or clogging when there is too much, significantly improving extraction uniformity and stability. Simultaneously, the mixing and filtration space H1 allows the coffee liquid to undergo coarse filtration, secondary mixing, and then fine filtration, promoting full contact between the oils and fine powder, enhancing liquid purity and flavor richness. Furthermore, after brewing, the elastic element 123 drives the movable top plate 121 to automatically reset, and its linkage structure facilitates rapid separation of coffee grounds from the inner wall of the filter chamber 11b, making cleaning easier and improving the user experience.

[0070] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A portable coffee filter cup structure, comprising a cup body having a hollow filter cavity, wherein the upper end of the cup body is provided with a powder inlet, the powder inlet being interconnected with the filter cavity, and the powder to be extracted entering the filter cavity through the powder inlet; characterized in that: The filter chamber is equipped with a top powder assembly, which includes a movable top plate and a support column located at the lower end of the movable top plate; the support column is slidably connected to the bottom of the filter chamber, and the circumferential edge of the movable top plate slides against the inner wall of the filter chamber; the powder to be extracted is isolated on the upper surface of the movable top plate; it also includes an elastic element, which is sleeved on the support column to provide a pre-tightening force to the movable top plate away from the bottom of the filter chamber; At least one first filter screen is provided in the middle of the movable top plate from top to bottom, and a second filter screen is provided at the bottom of the filter chamber. A mixing space is formed between the movable top plate and the bottom of the filter chamber. The extracted liquid passes through each of the first filters in sequence, flows into the mixing space, and then flows out after being filtered by the second filter screen.

2. The portable coffee filter cup structure according to claim 1, characterized in that, The movable top plate includes a top plate body, the first filter screen is provided in the middle of the top plate body, and a flexible partition ring is provided on the circumferential edge of the top plate body. The flexible partition ring extends obliquely upward and abuts against the cavity wall of the cup filter cavity; the top plate body and the flexible partition ring form an upward-opening disc structure.

3. The portable coffee filter cup structure according to claim 2, characterized in that, The filter cavity has a narrow cavity that gradually narrows towards the bottom; when the movable top plate moves downward, the narrow cavity acts on the flexible spacer ring and deforms it, and the opening of the disc-shaped structure shrinks accordingly.

4. The portable coffee filter cup structure according to claim 3, characterized in that, The circumferential edge of the main body of the top plate protrudes towards the bottom of the filter cavity, forming an annular boss; when the movable top plate moves downward and presses against the bottom of the filter cavity, the annular boss provides space for the compression of the elastic element.

5. The portable coffee filter cup structure according to claim 1, characterized in that, Both the first filter screen and the second filter screen are provided with multiple filter holes; wherein, the pore size of the second filter screen is smaller than or equal to the pore size of the first filter screen.

6. The portable coffee filter cup structure according to claim 1, characterized in that, The support extends through the bottom of the filter chamber, and a limiting block is provided on the outside of the bottom of the filter chamber.

7. The portable coffee filter cup structure according to claim 6, characterized in that, The support column has a threaded hole along its axial direction, and the fastener passes through the movable top plate from top to bottom and is connected to the threaded hole of the support column; the limiting block protrudes along its circumference to form a swivel handle.

8. The portable coffee filter cup structure according to claim 1, characterized in that, It also includes an outer cup shell, which has a hollow accommodating cavity. The upper end of the outer cup shell is provided with a cup shell opening, and the lower end is provided with a drip outlet. The accommodating cavity is connected to the cup shell opening and the drip outlet respectively. The cup body is inserted into the accommodating cavity through the cup shell opening and is detachably connected to the outer cup shell.

9. A portable coffee filter cup structure according to claim 8, characterized in that, The outer cup shell includes a cup holder, a heat insulation sleeve, and a flow guide cup; The cup holder has the receiving cavity, and the side wall of the receiving cavity is provided with a retaining ring for disassembly and engagement with the cup body; The heat insulation sleeve is fitted onto the outer periphery of the cup holder, with a heat insulation gap between them; The guide cup is shaped like a bucket and placed at the bottom of the cup body; the side wall of the guide cup narrows in a stepped manner from top to bottom, and the bottom of the guide cup protrudes in a conical shape to form the drip outlet.

10. An espresso machine, comprising a portable coffee filter cup structure as described in any one of claims 1-9, characterized in that, It also includes a brewing net, the upper end of which is connected to a water supply mechanism, which supplies water to the filter chamber; the brewing net extends into the filter chamber to press the powder, and the movable top plate is adapted to the lifting and lowering movement of the brewing net.

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