Removable filter device and coffee maker comprising same

Abstract

The utility model relates to a detachable filter device and coffee machine including it belong to household appliance technical field, this detachable filter device includes cup seat and with cup seat detachable connection's connecting cover still includes sealing washer, cup seat is equipped with the annular installation slot for containing sealing washer, the connecting cover has the annular compression wall extending to the cup seat direction, when the connecting cover is connected with cup seat, the end or the sidewall of annular compression wall carries out compression to sealing washer, makes sealing washer produce deformation and simultaneously with the wall of annular installation slot and the wall portion of annular compression wall forms the interference seal. The utility model discloses a detachable filter device and coffee machine including it, can promote the stability of the embedding structure of sealing washer between detachable components in current detachable filter device.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine technology, and in particular to a detachable filter device and a coffee machine including the same. Background Technology

[0002] As a common beverage preparation device, the coffee machine's core component is the coffee filter. This device typically includes a filter cup for holding coffee grounds and a base (or connecting cover) for securing the filter cup and guiding the extraction of coffee liquid. For ease of cleaning and replacement, modern coffee machines widely adopt a detachable filter cup design, meaning the filter cup (cup holder) and the base (connecting cover) are repeatedly connected and disconnected via snaps, threads, or other structures.

[0003] In this application scenario, ensuring a tight seal between the cup holder and the connecting cap is crucial. A poor seal will allow hot water under high temperature and pressure to leak during pressurized extraction, affecting not only the concentration and quality of the coffee but also posing a risk of burns or machine malfunction. Currently, the most common sealing method involves using O-rings or similar sealing elements at the mating surfaces of the two connectors. The seal is achieved by relying on the axial pressure generated when the connection is tightened. However, this planar compression sealing method has inherent drawbacks: First, its sealing effect relies excessively on the axial pressure provided by the locking mechanism. Over time, the locking mechanism may loosen or the sealing ring may permanently deform, leading to seal failure. Second, pure axial pressure is insufficient to ensure the sealing ring does not shift or "blow out" under fluid pressure. More importantly, this sealing method primarily provides a sealing function and contributes little to enhancing the structural rigidity and stability of the connection between the two detachable components, posing a risk of wobbling and impacting user experience and device lifespan.

[0004] Therefore, there is an urgent need in the field for an improved sealing structure for detachable coffee filter devices that can not only provide a long-term reliable sealing effect, but also significantly enhance the overall structural stability and impact resistance of the connection parts. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model proposes a detachable filter device and a coffee machine including the same, which can improve the stability of the embedded structure of the sealing ring between the detachable parts in the current detachable filter device.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a detachable filter device, including a cup holder and a connecting cover detachably connected to the cup holder, and also includes a sealing ring. The cup holder is provided with an annular mounting groove for accommodating the sealing ring, and the connecting cover has an annular pressing wall extending towards the cup holder. When the connecting cover is connected to the cup holder, the end or side wall of the annular pressing wall compresses the sealing ring, causing the sealing ring to deform and simultaneously forming an interference seal with the groove wall of the annular mounting groove and the wall of the annular pressing wall.

[0008] The preferred technical solution of this utility model is that the contact area between the annular pressing wall and the sealing ring has an arc-shaped structure.

[0009] The preferred technical solution of this utility model is that the annular pressing wall is at least partially inserted into the annular mounting groove.

[0010] The preferred technical solution of this utility model is that the shape and size of one side of the sealing ring matches the shape and size of the bottom of the annular mounting groove.

[0011] The preferred technical solution of this utility model is that the outer diameter of the cross-section of the sealing ring in the free state is greater than the groove depth of the annular mounting groove.

[0012] The preferred technical solution of this utility model is that a limiting structure is provided on the outer side of the connecting cover, and the limiting structure abuts against the bottom of the cup holder.

[0013] The preferred technical solution of this utility model is that the side wall of the cup holder is provided with a handle that is easy to grip.

[0014] The preferred technical solution of this utility model is that the sealing ring is made of food-grade silicone.

[0015] The present invention provides a coffee machine including the detachable filter device described above.

[0016] The beneficial effects of this utility model are:

[0017] This invention proposes a detachable filter device and a coffee machine including the same. The device features an annular mounting groove on the cup holder for accommodating a sealing ring, and an annular pressing wall extending towards the cup holder on the connecting cover. The annular pressing wall compresses the sealing ring, causing controlled deformation. Simultaneously, the sealing ring presses against the groove wall of the annular mounting groove and the inner surface of the annular pressing wall, forming an interference seal, thus achieving both sealing and retention. The structure of this invention significantly improves the stability of the sealing ring's embedding structure between detachable components in current detachable filter devices. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of a detachable filter device and a coffee machine including the same, according to Embodiment 1 of the present invention.

[0020] Figure 2 This is a top view of a detachable filter device and a coffee machine including the same, according to Embodiment 1 of the present invention.

[0021] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0022] Figure 4 This is a perspective view of the cup holder according to Embodiment 1 of this utility model;

[0023] Figure 5 This is a perspective view of the connecting cover according to Embodiment 1 of this utility model;

[0024] Figure 6 This is a perspective view of the sealing ring according to Embodiment 1 of this utility model.

[0025] In the picture:

[0026] 1-Cup holder; 11-Annular mounting groove; 2-Connecting cover; 21-Annular pressing wall; 22-Limiting structure; 3-Sealing ring; 4-Arc-shaped structure; 5-Handle. Detailed Implementation

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figure 1-6As shown, this embodiment provides a detachable filter device, including a cup holder 1 and a connecting cover 2 detachably connected to the cup holder 1, and a sealing ring 3. The cup holder 1 has an annular mounting groove 11 for accommodating the sealing ring 3. The connecting cover 2 has an annular pressing wall 21 extending towards the cup holder 1. When the connecting cover 2 is connected to the cup holder 1, the end or side wall of the annular pressing wall 21 compresses the sealing ring 3, causing the sealing ring 3 to deform and simultaneously form an interference seal with the groove wall of the annular mounting groove 11 and the wall of the annular pressing wall 21. The technical solution of this embodiment effectively improves the stability of the embedded structure of the sealing ring in the detachable component by designing the cooperation relationship between the cup holder (a base for supporting a coffee pot or filter cup), the connecting cover detachably connected to the cup holder (hereinafter referred to as "connecting cover", used to fix it to the cup holder and disassemble it when necessary), and the sealing ring placed between the two. Specifically, the cup holder is provided with an annular mounting groove for accommodating the sealing ring—the "annular mounting groove" refers to a continuous circumferential groove opened radially to position the sealing ring radially and circumferentially; the connecting cover is provided with an annular pressing wall extending towards the cup holder—the "annular pressing wall" is a circumferential thin wall protruding inward from the end face of the connecting cover, the end or side wall of which applies compressive force to the sealing ring when the connecting parts are closed. During operation, the connecting cover is in place, and the annular pressing wall compresses the sealing ring, causing it to undergo controlled deformation (i.e., compression and radial bulging). At the same time, the sealing ring squeezes and adheres to the groove wall of the annular mounting groove and the inner surface of the annular pressing wall, forming an "interference seal"—the "interference seal" is the interference fit between the sealing element and the surrounding rigid parts after being compressed and deformed, relying on elastic restoring force to maintain contact pressure and friction, thereby achieving the dual functions of sealing and retention. This structure enhances stability in three ways: First, geometric constraint—the annular mounting groove provides radial and circumferential mechanical positioning, preventing the sealing ring from slipping circumferentially or dislodging radially; second, compression preload—the axial compression of the sealing ring at the end of the annular pressing wall generates radial expansion stress in the sealing ring, forming a continuous normal contact pressure with the groove wall, enhancing resistance to extrusion and rotation; third, interference fit and friction locking—the friction between the deformed elastomer and the groove / pressing wall, as well as slight plastic hysteresis, requires overcoming a large release force during disassembly, thus maintaining stable embedding during use.

[0030] Preferably, the contact area between the annular compression wall 21 and the sealing ring 3 has an arc-shaped structure 4. The so-called "arc-shaped structure" means that the cross-section of the contact surface between the compression wall and the sealing ring is an arc or an arc transition (rather than a right angle or planar flange). Its main effect is to disperse contact stress, reduce stress concentration, and make the compression deformation of the sealing ring smooth and continuous, thereby reducing the risk of local cutting, stress cracking, and permanent compression deformation. Simultaneously, the arc-shaped contact promotes a more uniform deformation of the sealing ring along the circumferential direction, thus improving the circumferential friction distribution and anti-slip capability. Specifically, this can be achieved by machining a fillet R of a certain radius (e.g., R = 0.5-2.5 mm, adjusted according to the cross-sectional dimensions of the sealing ring and the material hardness) on the connecting cover mold; the end face of the sealing ring can also adopt a corresponding arc outline to achieve a larger contact area. During assembly, the arc-shaped structure guides the sealing ring to undergo controlled compression step by step, reducing the initial installation force peak, facilitating manual or automatic assembly. The arc-shaped contact surface structure increases the effective contact area, improving sealing reliability, thereby maintaining sealing and embedding stability under repeated disassembly and thermal shock. In summary, arc-shaped contact is a structural optimization of the press-to-seal interface. It is not only a direct means to improve sealing reliability, but also a preferred solution for extending service life and improving user experience.

[0031] Preferably, the annular compression wall 21 is at least partially inserted into the annular mounting groove 11. Here, "at least partially inserted" means that the lower end or outer periphery of the compression wall enters a certain depth into the mounting groove during assembly, rather than merely pressing the sealing ring against the outside of the groove opening. This structure functionally achieves dual constraints from the compression wall and the groove wall: on the one hand, the compression wall applies axial compression to the sealing ring to form an interference seal; on the other hand, the wall portion entering the groove provides mechanical stops in the radial and circumferential directions, significantly reducing radial extrusion and circumferential misalignment of the sealing ring under high pressure or vibration. Furthermore, the outer diameter of the compression wall is designed as a transition dimension slightly smaller than the inner diameter of the groove but larger than the groove opening diameter, or an introductory ramp is provided on the compression wall to guide insertion; controlled pressing force or graded snap-fit ​​is used during assembly to ensure that the compression wall reliably enters the predetermined depth. The advantages of the above structure are: First, mechanical interlocking reduces the risk of relying solely on friction, improving sealing stability under rapid thermal expansion and pressure fluctuations; second, insertion-type pressing reduces the probability of partial roll-out of the sealing ring, extending material fatigue life; third, the double-wall clamping formed by the partial encapsulation of the pressing wall within the groove provides a clear positioning feel at the disassembly interface, helping users perceive correct assembly. By reasonably coordinating the tolerances and surface treatments (such as micro-chamfering and surface finish control) of the pressing wall and groove, and selecting sealing materials of appropriate hardness, this "at least partially inserted" structure can improve the repeatability and safety margin of disassembly assembly while ensuring sealing performance.

[0032] Preferably, the shape and size of one side of the sealing ring 3 match the shape and size of the bottom of the annular mounting groove 11. "Matching" means that the corresponding side profile of the sealing ring in its free or initial installation state fits or nearly fits the groove bottom profile (e.g., a rectangular groove corresponds to a rectangular flange, a trapezoidal groove corresponds to a trapezoidal sealing side profile, or a semi-circular groove corresponds to a semi-circular cross-section). Its technical significance lies in achieving positive positioning and anti-rotation / anti-slip functions through shape closure, rather than relying solely on compression friction. The sealing ring can be manufactured using in-mold molding or a traditional silicone secondary vulcanization / molding process to ensure its side profile matches the groove bottom profile; the groove bottom can also be machined according to this shape and chamfered for assembly. The above-mentioned technical solutions have the following advantages: First, complementary shapes provide geometric interlocking, which transforms the contact surface of the sealing ring into in-plane force transmission when subjected to axial or radial loads, thereby reducing relative displacement; Second, the matching structure can effectively restrict the degree of freedom of the sealing ring in circumferential rotation or flipping, improving shear resistance and extrusion resistance; Third, the matching design can also make the stress distribution of the sealing ring more uniform when it is compressed, reduce local stress peaks, and delay material fatigue and aging.

[0033] Preferably, the outer diameter of the sealing ring 3 in its free state is greater than the groove depth of the annular mounting groove 11. Here, "free state" refers to the body size of the sealing ring when it is not subjected to external force and is not installed in the groove, and "groove depth" is the vertical distance from the groove opening to the bottom of the groove. When the outer diameter is slightly larger than this depth, the sealing ring needs to be compressed or deformed after assembly, thereby generating continuous elastic restoring force and radial bulging. The means to achieve this usually include selecting an over-mixing ratio exceeding the groove depth according to the hardness of the sealing material (e.g., Shore A40-70), and introducing a bevel or assembly chamfer in the groove design to reduce initial installation resistance, while ensuring sufficient residual compression after assembly to maintain the seal.

[0034] Preferably, a limiting structure 22 is also provided on the outer side of the connecting cover 2. The limiting structure 22 abuts against the bottom of the cup seat 1, aiming to control the upper limit of the pressing force and relative displacement through mechanical stopping, thereby protecting the sealing ring and ensuring the consistency of the detachable mechanism in repeated assembly. The so-called "limiting structure" includes, but is not limited to, a flange, a stop ring, or an outward rib located on the outer side of the connecting cover. When closed, it contacts the bottom of the cup seat to form a physical termination surface, limiting the excessive compression caused by the connecting cover continuing to penetrate or rotate. The setting of the limiting structure has the following advantages: First, by limiting relative movement, the limiting structure improves the assembly positioning accuracy and repeatability, avoiding inconsistent sealing caused by differences in manual assembly torque; Second, the limiting structure can also serve as a safety protection, preventing user misassembly or structural damage caused by external forces.

[0035] Preferably, the cup holder 1 has a handle 5 on its side wall for easy gripping. This handle not only improves the user's operating experience, but its surface can also be textured with a non-slip surface or covered with a soft material. The handle allows the user to apply a more stable and controllable torque when assembling or disassembling the connecting cover or moving device, avoiding uneven loading or forceful compression caused by an unstable grip; the handle also assists in achieving correct alignment and assembly posture, reducing assembly errors and indirectly ensuring the alignment accuracy between the sealing ring and the annular mounting groove.

[0036] Preferably, the sealing ring 3 is made of food-grade silicone. Food-grade silicone is defined as silicone that meets the relevant food contact material standards (e.g., GB, FDA, or EU 10 / 2011 requirements). Its main advantages are a wide temperature range (commonly -40℃ to +200℃), good elastic recovery, aging resistance, and chemical stability to hot water and acidic coffee liquids. Silicone is highly elastic and rebounds quickly, maintaining continuous normal contact pressure after being compressed, thus reducing compression set. Its high temperature resistance and chemical corrosion resistance make it less prone to cracking or hardening under repeated thermal shock (hot water immersion), thereby maintaining embedding stability. Food-grade certification reduces the risk of material migration and odor generation, improving the food safety of the end product and user trust. In summary, food-grade silicone not only meets regulatory and hygiene requirements but also directly enhances the embedding stability and long-term reliability of the sealing ring in detachable components through its material properties.

[0037] Example 2

[0038] This embodiment provides a coffee machine that includes the detachable filter device described in Embodiment 1.

[0039] This utility model 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 this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A detachable filter device, comprising a cup holder (1) and a connecting cover (2) detachably connected to the cup holder (1), characterized in that: It also includes a sealing ring (3), the cup seat (1) is provided with an annular mounting groove (11) for accommodating the sealing ring (3), and the connecting cover (2) has an annular pressing wall (21) extending toward the cup seat (1); When the connecting cover (2) is connected to the cup seat (1), the end or side wall of the annular pressing wall (21) compresses the sealing ring (3), causing the sealing ring (3) to deform and simultaneously form an interference seal with the groove wall of the annular mounting groove (11) and the wall of the annular pressing wall (21).

2. The detachable filter device according to claim 1, characterized in that: The contact area between the annular press-fit wall (21) and the sealing ring (3) has an arc-shaped structure (4).

3. The detachable filter device according to claim 1, characterized in that: The annular pressing wall (21) is at least partially inserted into the annular mounting groove (11).

4. The detachable filter device according to claim 1, characterized in that: The shape and size of one side of the sealing ring (3) match the shape and size of the bottom of the annular mounting groove (11).

5. The detachable filter device according to claim 1, characterized in that: The outer diameter of the cross-section of the sealing ring (3) in its free state is greater than the groove depth of the annular mounting groove (11).

6. The detachable filter device according to claim 1, characterized in that: The outer side of the connecting cover (2) is also provided with a limiting structure (22), which abuts against the bottom of the cup holder (1).

7. The detachable filter device according to claim 1, characterized in that: The cup holder (1) has a handle (5) on its side wall for easy gripping.

8. The detachable filter device according to claim 1, characterized in that: The sealing ring (3) is made of food-grade silicone.

9. A coffee machine, characterized in that: Includes the removable filter device as described in any one of claims 1-8.

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