refrigerator

Abstract

This application provides a refrigerator, belonging to the field of household appliance technology, aiming to solve the problems of low negative pressure extraction efficiency and insufficient flavor release. The refrigerator includes an extraction device and a vacuum device; the extraction device includes an outer cup, a lid, and an inner cup for holding materials; the vacuum device evacuates air from the inner cup; the liquid level in the outer cup is designated as a third reference surface; the plane containing the bottom of the inner cup is designated as a second reference surface; when the lid is installed on the outer cup, the volume of liquid surrounding the inner cup and located above the second reference surface in the outer cup is designated as V. y The volume of the region above the third reference plane of the inner cup is denoted as V. S V y <V S When the suction device is working, the distance between the third reference surface and the second reference surface gradually decreases; after the liquid level in the outer cup drops to the second reference surface, the gas enters the inner cup and passes through the material layer and liquid, generating bubbles; this application enables the liquid and bubbles to enter the material layer under negative pressure, and enhances the flavor release during the bubble impact process, achieving efficient and uniform extraction.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more particularly to a refrigerator. Background Technology

[0002] As people's living standards improve, refrigerators have evolved from simple food storage devices into integrated home food centers that combine preservation, processing, and preparation. The creation of brewed beverages such as coffee and tea is gradually becoming an important area for expanding the functions of refrigerators.

[0003] Currently, some refrigerators are integrating simple beverage preparation functions, with one common technology being negative pressure immersion extraction. This method typically involves an inner and outer cup that are connected to each other. A vacuum device evacuates the inner cup, creating negative pressure. Liquid from the outer cup then enters the inner cup under atmospheric pressure, fully contacting and immersing the contents (such as coffee powder or tea leaves). When the vacuum device stops, the liquid in the inner cup flows back to the outer cup under gravity.

[0004] However, the above extraction process relies on the static soaking of the material by the liquid, and the release of flavor compounds depends entirely on natural diffusion. During the soaking process, a concentration boundary layer gradually forms on the surface of the material, hindering the continuous precipitation of soluble substances, resulting in low extraction efficiency and a long extraction time. At the same time, static soaking cannot effectively agitate the material, making it difficult to fully release deep flavor compounds inside the material, thus limiting the concentration and flavor fullness of the extract. Summary of the Invention

[0005] This application provides a refrigerator whose extraction device causes the distance between the liquid level in the outer cup and the bottom of the inner cup to decrease and then remain constant during extraction. This allows the liquid and bubbles to enter the material layer under negative pressure, enhancing flavor release during bubble impact and achieving efficient and uniform extraction.

[0006] In a first aspect, a refrigerator is provided, comprising: Extraction apparatus, comprising: An outer cup is used to hold liquid; the outer cup is connected to the external environment through a vent. A cup lid that mates with the open end of the outer cup; The inner cup, the top of which is connected to the bottom of the cup lid, is used to hold materials; An air extraction device is used to extract air from the inner cup; The liquid level inside the outer cup is designated as the third reference surface L3; the plane containing the bottom of the inner cup is designated as the second reference surface L2. When the cup lid is installed on the open end of the outer cup, the inner cup is at least partially located inside the outer cup, the bottom of the inner cup is connected to the outer cup, and the second reference surface L2 is located below the third reference surface L3; The inner cup is divided into a first receiving portion and a second receiving portion by the third reference surface L3; wherein the first receiving portion is located above the third reference surface L3; The area of ​​the outer cup outside the inner cup is divided into a first outer container and a second outer container by the second reference surface L2; wherein the first outer container is located above the second reference surface L2; The volume of the first containment section is denoted as V. S The volume of liquid contained in the first outer container is denoted as V. y Among them, V y <V S ; When the air extraction device is working, the distance between the third reference surface L3 and the second reference surface L2 gradually decreases until it remains constant.

[0007] The above technical solutions, V y <V SThrough volume matching, it is ensured that the liquid in the outer cup is completely contained within the inner cup space after entering the inner cup, and the liquid level will not reach the top of the inner cup, preventing liquid from entering the suction device and causing equipment damage. Secondly, the volume relationship ensures that all the liquid in the area surrounding the outer cup can enter the inner cup, and the liquid level in the outer cup will inevitably drop below the connecting structure, providing certainty for triggering the bubble extraction stage. When the suction device is working, the liquid level in the outer cup gradually drops, and the distance between the third reference surface L3 and the second reference surface L2 gradually decreases. Before the critical state (the liquid level in the outer cup will inevitably drop to the position of the connecting structure), liquid immersion extraction is performed to fully wet the material. After the critical state, after the connecting structure connecting the bottom of the inner cup to the outer cup is exposed, the distance between the third reference surface L3 and the second reference surface L2 remains unchanged. At this time, the suction device continues to work, and the sucked-in air forms a continuous upward flow of bubbles, performing bubble extraction. Mass transfer is enhanced through the mechanical action of bubbles and interface renewal. As bubbles rise, they exert a fourfold effect: mechanical agitation causes material particles to tumble in the water, disrupting the boundary layer; turbulent disturbance accelerates the renewal rate of the water flow around the material; the energy released by the bursting bubbles near the liquid surface further disturbs the material layer; and dynamic channel reconfiguration homogenizes the flow path within the material layer. These four effects synergistically enhance the mass transfer process, allowing flavor compounds within the material to be released into the water more quickly and fully, increasing the concentration and flavor fullness of the extract. A single cycle achieves the synergistic effect of liquid immersion extraction and bubble extraction, while multiple cycles combined with a two-stage mixing and dilution mechanism sustainably maintain a high concentration gradient between the material and the liquid phase, preventing mass transfer stagnation caused by extract saturation and further amplifying the extraction efficiency advantage. The combination of these two stages produces a synergistic effect, significantly improving overall extraction efficiency.

[0008] In some embodiments, the outer cup has a first reference surface, and the liquid that the outer cup can hold is not higher than the first reference surface; When the cup lid is installed on the open end of the outer cup, the portion of the inner cup located above the first reference surface L1 is referred to as the first content portion; The volume of the first outer portion is denoted as V1, and the volume of the first inner portion is denoted as V2; wherein, V1 < V2.

[0009] The above technical solution, through the limiting volume matching of V1 < V2, provides a safety net for extreme usage scenarios where the outer cup is filled to its maximum liquid level. This ensures that even after the maximum liquid volume of the outer cup enters the inner cup, it can still be completely contained within the first inner chamber of the inner cup, preventing the liquid level from reaching the top of the inner cup. This prevents liquid overflow and environmental pollution, and also prevents liquid from entering the suction device and causing equipment damage. Secondly, this volume relationship ensures that the maximum liquid volume surrounding the outer cup can all enter the inner cup, inevitably causing the liquid level in the outer cup to drop below the connecting structure, providing absolute certainty for triggering the bubble extraction stage. Simultaneously, the design of the first inner chamber extends the effective volume of the inner cup upwards, allowing the liquid level to rise above the highest liquid level of the outer cup during suction, completely immersing all materials in the inner cup and solving the problem of insufficient extraction caused by the upper layer of material not fully contacting the liquid in traditional structures.

[0010] In some embodiments, the outer cup has a first reference surface, and the liquid that the outer cup can hold is not higher than the first reference surface; When the cup lid is installed on the open end of the outer cup, the portion of the inner cup located below the first reference surface L1 is referred to as the second content portion; The second internal section is used to hold materials, and its volume is denoted as V. n Among them, V y >kV n , where k is the ratio of the volume of water required for the material to become saturated to the volume of the material.

[0011] The above technical solutions, V y >kV n At that time, the amount of liquid in the first outer container is sufficient to meet the material's water absorption saturation requirements, so that the material in the second inner container can fully absorb water, fully expand and wet, and the soluble substances inside the material can be fully released into the liquid, avoiding the residue of soluble substances inside the material due to insufficient water absorption, resulting in insufficient extraction and waste.

[0012] In some embodiments, where V y >m×kV n , m≥1.5.

[0013] The above technical solution significantly increases the total liquid volume entering the inner cup from the outer cup during extraction. This increased liquid volume in the inner cup results in a higher liquid-to-solid ratio, a larger liquid volume, a slower increase in solute concentration, and a longer maintenance of the concentration gradient between the material and the liquid. This leads to a sustained high mass transfer driving force, making it less likely for the liquid to reach saturation, and allowing extraction to continue for a longer period without degradation. Furthermore, the increased liquid volume in the inner cup during extraction results in a longer upward path for bubbles in the liquid during the bubble extraction stage, increasing the gas-liquid contact time. Simultaneously, the increased liquid volume allows the liquid to accommodate more bubbles, increasing the number of contactes between bubbles and the material. The rising bubbles in a large volume of liquid enhance the adsorption and carrying capacity of flavor compounds.

[0014] In some embodiments, the extraction device includes a lid; the lid is rotatably connected to the cup lid; The cover is provided with a sealing part, which is in the form of a closed ring; The cup lid is provided with a suction hole that communicates with the inner cup, and the vent hole is located on the cup lid and communicates with the outer cup; When the lid body is engaged with the cup lid, the sealing part is engaged with the cup lid, and the sealing part surrounds the air extraction hole and the vent hole; the sealing part, the cup lid, and the lid body together define a first cavity; The internal space of the inner cup is connected to the outer cup through the air extraction hole, the first cavity, and the vent hole.

[0015] The above technical solution, in the conventional operation process where the user does not open the lid (the lid and cup cover are in a tight seal), relies on the through air passage of inner cup → air extraction hole → first cavity → vent hole → outer cup, and the connecting structure between the bottom of the inner cup and the outer cup, to automatically complete the bidirectional gas-liquid exchange: the liquid in the outer cup flows into the inner cup through the bottom of the inner cup, and the normal pressure air inside the inner cup is simultaneously and smoothly discharged to the normal pressure space above the liquid surface of the outer cup through the above air passage, without the need for the user to open the lid to release air.

[0016] Without this air passage, when the inner cup with the closed lid is placed into the outer cup, the air inside the inner cup cannot escape, and liquid cannot enter the inner cup. The entire volume of the inner cup will be used to displace the liquid in the outer cup, causing the liquid level to rise rapidly and easily overflow. In this solution, the internal space of the inner cup can simultaneously hold the liquid, significantly reducing the rise in the liquid level in the outer cup when the inner cup is placed in, and solving the problem of liquid overflow caused by users adding too much water beforehand.

[0017] In some embodiments, the cup lid is provided with a pressure relief hole communicating with the inner cup. When the lid body is engaged with the cup lid, the sealing part engages with the cup lid and surrounds the pressure relief hole. The cross-sectional area of ​​the pressure relief hole is denoted as S1, the cross-sectional area of ​​the air extraction hole is denoted as S2, and the cross-sectional area of ​​the vent hole is denoted as S3; wherein, S1 < S2 < S3.

[0018] In the above technical solution, during extraction, the cap is opened, and both the pressure relief hole and the vent hole are connected to the outside. The suction hole serves as the main suction channel to draw negative pressure from the inner cup. Because S2 > S1, the vent hole has a larger cross-section than the pressure relief hole. The suction device can efficiently draw air from the inner cup through the suction hole, quickly forming a stable negative pressure. This ensures that the liquid from the outer cup flows smoothly into the inner cup from the bottom, fully wetting the material and ensuring the basic efficiency of vacuum extraction. At the same time, the pressure relief hole has the smallest diameter and limited air intake, which can prevent a large amount of external gas from rushing back and offsetting the negative pressure in the inner cup, preventing the negative pressure from decaying too quickly, and keeping the negative pressure in the inner cup within a reasonable range. This allows the liquid to enter slowly and evenly, avoiding the problem of material dispersion and uneven extraction caused by the liquid rapidly splashing onto the material.

[0019] After the evacuation stops, air is introduced into the inner cup through the pressure relief hole to increase the internal air pressure, thereby driving the liquid in the inner cup to flow back to the outer cup. Because S1 is the smallest cross-section, the outside gas can only enter the inner cup in a small flow rate and slowly, and the air pressure in the inner cup gradually rises at a uniform speed without sudden pressure increase; correspondingly, the liquid level in the inner cup drops slowly and steadily, effectively preventing sudden liquid drop impact, water splashing, and residual liquid dripping off the wall. The backflow process is quiet and clean, improving the user experience.

[0020] The vent has the largest cross-sectional area (S3 > S2), and is fully connected to the outside world. It can quickly balance the air pressure in the lid fitting area and the upper space of the outer cup, ensuring that the outer cup always maintains a normal pressure environment and eliminating the problems of air pressure stagnation and blockage. On the one hand, it provides a stable air pressure prerequisite for the continuous and smooth flow of liquid from the outer cup into the inner cup. On the other hand, it avoids the impact of local air pressure accumulation on the entire set of actions of suction, depressurization, and backflow, ensuring smooth air flow throughout the entire process.

[0021] By using a differentiated cross-sectional design with S1 < S2 < S3, the functional positioning of different vents is precisely matched: the pressure relief vent is mainly for micro-air intake, the air extraction vent is mainly for high-efficiency air extraction, and the ventilation vent is mainly for high-volume atmospheric pressure interconnection and drinking. The airflow of each vent does not interfere with each other and each performs its own function, so that the entire process of extraction, air extraction, pressure relief, reflux and drinking is connected and smooth, reducing the use failures caused by air pressure disturbances and improving the overall reliability of the device.

[0022] In some embodiments, the extraction apparatus includes: A filter is disposed within the first content section; the filter is located above the material.

[0023] In the above technical solution, during the liquid immersion extraction stage, the liquid enters from the bottom of the inner cup and flows upward after passing through the material layer. At this time, the filter is located above the material layer, which can effectively intercept the fine particles carried by the liquid, preventing them from entering the first inner chamber of the inner cup and the suction device. This effectively protects the suction device from particle damage and also ensures the cleanliness of the upper space of the inner cup.

[0024] In some embodiments, the filter has a protrusion on the side near the top of the cup lid; The top of the protrusion engages with the cup lid to limit the relative position of the filter and the top of the cup lid.

[0025] The above technical solution allows the top of the protruding part of the filter to directly engage with the bottom of the cup lid for positioning. When the cup lid and inner cup are assembled, the protruding part automatically presses and fixes the filter at a preset height above the material, realizing the linkage assembly of installing the cup lid and the filter, greatly simplifying the assembly steps. At the same time, it can completely resist the force generated by the upward flow of liquid during air extraction and the downward impact of liquid during recirculation, preventing the filter from moving up and down or tilting, ensuring that the filter surface always horizontally covers the cross-section of the inner cup, and avoiding edge leakage.

[0026] The filter is placed on top of the material to effectively prevent light materials (such as tea leaves and herbal teas) from floating to the surface when the liquid flows in. This ensures that all materials are always fully submerged in the extract, avoiding problems such as insufficient extraction and uneven taste caused by some materials not being in sufficient contact with the liquid, thus improving extraction efficiency and product consistency.

[0027] In some embodiments, a first filter screen is provided on the bottom wall of the inner cup; A second filter screen is provided on the peripheral wall of the inner cup; Wherein, the aperture of the first filter screen is denoted as the first diameter D1; the aperture of the second filter screen is denoted as the second diameter D2; D1 > D2.

[0028] The above technical solution incorporates a bottom-mounted first filter and a circumferential wall-mounted second filter within the inner cup, forming a multi-channel liquid inlet layout with a main bottom inlet and circumferential auxiliary inlet. This significantly increases the total flow area of ​​the liquid entering the inner cup. Compared to a single bottom-mounted inlet structure, this allows for a faster liquid inlet speed under the same negative pressure conditions, shortens the time required for the liquid to fully wet the material, and improves overall extraction efficiency.

[0029] Secondly, the liquid simultaneously flows from the bottom upwards and from the sides towards the center into the inner cup, forming a cross-flow field that comprehensively washes and agitates the coffee grounds and other materials. This effectively breaks up material clumps, avoids dead zones, and ensures that every particle of material can fully contact the extract. This completely solves the problems of insufficient local extraction and uneven overall extraction caused by traditional unidirectional liquid injection, significantly improving the extraction rate of active ingredients and the consistency of the finished product's taste.

[0030] Furthermore, the pore size of the first filter screen at the bottom is larger than that of the second filter screen on the periphery (D1 > D2), resulting in a distribution of liquid flow resistance characterized by low resistance at the bottom and high resistance on the periphery. During the vacuum extraction and degassing stage, the liquid in the outer cup will preferentially flow into the inner cup through the lower-resistance, large-pore bottom filter screen, forming a powerful, penetrating water flow from bottom to top that directly penetrates the entire coffee grounds layer. Compared to circumferential side flow, this penetrating water flow can penetrate deeper into the interior of the coffee particles, dissolving flavor compounds in the coffee more efficiently and significantly improving extraction depth and efficiency.

[0031] Furthermore, during the stage where vacuuming stops and the liquid flows back into the outer cup, the larger pore size of the bottom filter and the lower resistance to liquid flow due to gravity cause the extract in the inner cup to slowly precipitate and flow back through the bottom filter, rather than rapidly flowing out through the small-pore filter on the perimeter wall. This technical solution forcibly extends the residence time of the liquid in the coffee grounds layer, allowing for more thorough immersion and extraction of the liquid and coffee grounds, further releasing the effective components and enhancing the concentration and flavor richness of the final product. Attached Figure Description

[0032] Figure 1 An exemplary schematic diagram of the overall structure of a refrigerator according to some embodiments is shown; Figure 2 An exemplary overall schematic diagram of the extraction apparatus according to some embodiments is shown with the lid open; Figure 3 An exemplary cross-sectional view of an extraction apparatus according to some embodiments is shown with the lid closed; Figure 4 An exemplary schematic diagram of the structure of the inner cup of an extraction apparatus according to some embodiments is shown; Figure 5 An exemplary schematic diagram of the inner cup of an extraction apparatus according to some embodiments is shown from another perspective; Figure 6 An exemplary schematic diagram of the structure of an extraction apparatus according to some embodiments is shown when the outer cup is partially filled with liquid; Figure 7 An exemplary schematic diagram of the structure of an extraction apparatus according to some embodiments when the outer cup is filled with liquid is shown; Figure 8An exemplary schematic diagram of the extraction apparatus according to some embodiments is shown when the liquid level in the outer cup drops to the second reference surface during evacuation; Figure 9 An exemplary schematic diagram of the extraction apparatus according to some embodiments is shown when the liquid level in the inner cup decreases and the liquid level in the outer cup increases after the pumping stops; Figure 10 An exemplary schematic diagram is shown of the structure when the docking portion of the air extraction device mates with the extraction device according to some embodiments; Figure 11 An exemplary schematic diagram of a partial structure of a door according to some embodiments is shown; Figure 12 A schematic diagram of the structure of an air extraction device according to some embodiments is shown as an example.

[0033] The refrigerator includes: a refrigerator body 101; a door 102; a receiving part 103; a support base 104; an extraction device 2; an inner cup 21; an outer cup 22; a cup lid 23; a connecting hole 24; a filter 25; a protrusion 26; a cover 27; a suction hole 231; a pressure relief hole 232; a vent hole 233; a sealing part 28; a first cavity 20; a first filter screen 291; a second filter screen 292; a first inner part 211; a second inner part 212; a first outer part 221; a second outer part 222; a suction part 31; a docking part 32; a suction pipe 33; a pressure relief component 34; a first reference surface L1; a second reference surface L2; a third reference surface L3; and a first end face P1. Detailed Implementation

[0034] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0035] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0036] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0037] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0038] Please refer to some embodiments of this application. Figures 1-12 As shown, a refrigerator 100 includes a body 101 having a storage compartment, a door 102 connected to the body 101 for opening and closing the storage compartment, and a refrigeration device for supplying cold air to the storage compartment. The body 101 includes an inner liner defining the storage compartment, an outer shell connected to the outer side of the inner liner to form the appearance of the refrigerator 100, and a heat insulation layer disposed between the inner liner and the outer shell to insulate the storage compartment.

[0039] In some embodiments of this application, a retrieval opening is formed at the front end of the storage compartment to allow for placing stored items into or retrieving stored items from the storage compartment. For example... Figure 1 As shown, the door 102 is rotatably connected to the box 101 to open or close the access port of the storage room.

[0040] In some embodiments of this application, the refrigerator 100 includes a vacuum extraction system. The above technical solution provides a stable low-temperature refrigeration environment, which, combined with vacuum extraction technology, forms a unique low-temperature vacuum cold extraction mode. The low-temperature environment of the refrigerator 100 effectively inhibits the precipitation of bitter substances such as tannins and caffeine, while maximizing the preservation of aromatic substances and nutrients in coffee, tea, herbs, and other materials. The integrated design of the vacuum extraction system in the refrigerator 100 ensures that the entire extraction process is conducted in the low-temperature, light-proof, and low-oxygen environment of the refrigerator 100, fundamentally preventing oxidation and deterioration of the extract during the production process, resulting in flavor retention far exceeding that of independent extraction equipment.

[0041] Secondly, integrating the vacuum extraction system as a standard functional module of the refrigerator 100 fully utilizes unused space in the refrigerator 100's door 102 and side walls, eliminating the need for additional kitchen countertop space, making it especially suitable for small kitchens. The integrated design also results in a cleaner, more unified appearance for the refrigerator 100, avoiding the problems of messy wiring and dust accumulation associated with independent extraction equipment. Furthermore, the water and electricity piping for the extraction system can be integrated with the refrigerator 100's existing piping system, eliminating the need for users to install separate water and electricity connections, making installation and use more convenient. This structural integration achieves a dual optimization of both space and aesthetics.

[0042] Furthermore, the integrated design of the refrigerator 100's integrated vacuum extraction system allows the entire process—from material storage to extraction, refrigeration, and direct consumption—to be completed within the refrigerator 100 itself. Specifically, users can store coffee beans, tea leaves, fruits, and other extraction materials directly inside the refrigerator 100 for immediate use, ensuring freshness. After extraction, the beverage can be stored directly in the refrigerator 100 without needing to be transferred to another container.

[0043] Please refer to Figures 2-9 As shown, the vacuum extraction system includes an extraction device 2 and a vacuum extraction device. The extraction device 2 includes an outer cup 22 for holding liquid. The outer cup 22 is connected to the external environment through a vent 233. The extraction device 2 includes a lid 23 that mates with the open end of the outer cup 22. The extraction device 2 also includes an inner cup 21 for holding material. The top of the inner cup 21 is connected to the bottom of the lid 23. The vacuum extraction device is used to evacuate air from the inner cup 21. The bottom of the inner cup 21 is connected to the outer cup 22 through a connecting structure. This connecting structure can be configured as a connecting hole 24.

[0044] The liquid surface inside the outer cup 22 is designated as the third reference surface L3; the plane containing the bottom of the inner cup 21 is designated as the second reference surface L2.

[0045] When the lid 23 is installed on the open end of the outer cup 22, the inner cup 21 is at least partially located inside the outer cup 22, and the bottom of the inner cup 21 is connected to the outer cup 22. The second reference surface L2 is located below the third reference surface L3. It should be noted that the state where the second reference surface L2 is located below the third reference surface L3 is the relative positional relationship after the extraction device 2 is assembled and before it is evacuated by the evacuation device. As the evacuation device operates, the position of the third reference surface L3 will change, and the relative distance between the second reference surface L2 and the third reference surface L3 will change accordingly.

[0046] The inner cup 21 is divided into a first receiving section and a second receiving section by a third reference surface L3; wherein the first receiving section is located above the third reference surface L3.

[0047] The area of ​​the outer cup 22 located outside the inner cup 21 is divided into a first outer container 221 and a second outer container 222 by the second reference surface L2; wherein, the first outer container 221 is located above the second reference surface L2.

[0048] The volume of the first containment section is denoted as V. S The volume of liquid contained in the first outer container 221 is denoted as V. y Among them, V y <V S It should be noted that the above V y With V S Satisfy V y <VS The size relationship specifically refers to the initial assembly state before the vacuuming process is started and negative pressure is applied.

[0049] When the pumping device is working, the distance between the third reference surface L3 and the second reference surface L2 gradually decreases until it remains constant.

[0050] For details, please refer to Figures 6-9 As shown, when the pumping device is working, the liquid in the outer cup 22 is drawn into the inner cup 21, causing the liquid level in the outer cup 22 (third reference surface L3) to continuously decrease and the liquid level in the inner cup 21 to continuously rise. Therefore, the distance between the third reference surface L3 and the plane where the bottom of the inner cup 21 is located (second reference surface L2) gradually decreases. When the liquid level in the outer cup 22 drops below the connecting structure (connecting hole 24) at the bottom of the inner cup 21 that connects the inner cup 21 and the outer cup 22, the liquid can no longer enter the inner cup 21, and the distance between the third reference surface L3 and the second reference surface L2 remains unchanged.

[0051] It should be noted that when the second reference plane L2 is below the third reference plane L3, the distance between the two reference planes L2 and L3 is positive. When the second reference plane L2 and L3 are coplanar, the distance between them is 0. When the second reference plane L2 is above the third reference plane L3, the distance between them is negative. That is, when the pumping device is working, as the third reference plane L3 descends, the distance between the second reference plane L2 and L3 continuously decreases; while as the position of the third reference plane L3 remains unchanged, the distance between the second reference plane L2 and L3 remains constant.

[0052] In addition, during the stage when the gas flow enters the inner cup 21 to extract the material, the gas in the outer cup 22 enters the inner cup 21 and passes through the material layer and liquid, generating bubbles. The bubbles cause local minor fluctuations in the adjacent liquid surfaces of the inner cup 21 and the outer cup 22, but the macroscopic distance between the third reference surface L3 and the second reference surface L2 remains basically unchanged. The above-mentioned "the distance between the third reference surface L3 and the second reference surface L2 remains unchanged" means that the macroscopic distance does not change trend within the allowable fluctuation range and belongs to the distance limit under a relatively static state.

[0053] The above technical solutions, V y <V SThrough volume matching, it is ensured that the liquid in the outer cup 22 is completely contained within the space of the inner cup 21 after entering the inner cup 21, and the liquid level will not reach the top of the inner cup 21, preventing liquid from entering the suction device and causing equipment damage. Secondly, the volume relationship ensures that all the liquid in the area surrounding the outer cup 22 can enter the inner cup 21, and the liquid level in the outer cup 22 will inevitably drop below the connecting structure (connecting hole 24), providing certainty for the triggering of the bubble extraction stage. When the pumping device is working, the liquid level inside the outer cup 22 gradually decreases, and the distance between the third reference surface L3 and the second reference surface L2 gradually decreases. Before the critical state (the liquid level in the outer cup 22 must drop to the position of the connecting structure (connecting hole 24)), liquid immersion extraction is performed to fully wet the material. After the critical state, after the connecting structure (connecting hole 24) connecting the bottom of the inner cup 21 and the outer cup 22 is exposed, the distance between the third reference surface L3 and the second reference surface L2 remains unchanged. At this time, the pumping device continues to work, and the sucked-in air forms a continuous upward flow of bubbles to perform bubble extraction. Mass transfer is enhanced through the mechanical action of the bubbles and interface renewal.

[0054] The bubbles have four effects during the rising process: (1) mechanical agitation, causing the material particles to tumble in the water and destroying the boundary layer.

[0055] Specifically, as the bubbles ascend through the liquid and material layers in the inner cup 21, they interact with the material particles through contact, compression, and sliding, creating a strong mechanical disturbance that breaks up particle agglomeration that might occur due to liquid immersion. This causes the material particles to resuspend, rotate, and redistribute, increasing the effective contact area. This is equivalent to automatic gas stirring of the material layer, achieving uniform disturbance without any mechanical stirring components. For materials prone to clumping (such as finely ground coffee powder), the main causes of clumping are capillary forces and electrostatic effects. Simple liquid flow (such as pump circulation) may create fixed channels rather than truly loosening the material layer. The overall disturbance from bottom to top by the bubbles more effectively breaks down the adhesion between powder particles, achieving uniform loosening.

[0056] (2) Turbulent disturbances accelerate the renewal rate of water flow around the material.

[0057] Specifically, as the bubbles rise, they draw in the surrounding liquid through the wake entrainment effect, creating a macroscopic air-lift localized convection circulation. The liquid, after rising to the surface with the bubbles, disperses to both sides and flows back down along the container walls or outer areas, forming a circulation structure that runs through the entire liquid phase. This circulation introduces convective mass transfer into the material layer, enabling the liquid to flow actively between particles.

[0058] At the microscopic level, the bubble wakes create localized turbulent vortices within the material layer. This turbulence rapidly carries away dissolved flavor compounds from the particle surface, maintaining a significant concentration gradient between the particle surface and the bulk liquid. According to Fick's law, this high concentration gradient not only accelerates mass transfer from the surface to the liquid phase but also drives the accelerated diffusion of substances from within the particles to the surface, creating a positive cycle. Simultaneously, as bubbles pass through the material layer, they contact and slide across the particle surface, generating shear forces that directly peel away the static liquid film adhering to the particle surface, allowing fresh liquid to directly contact the particle surface and overcome the primary resistance to mass transfer. Furthermore, when bubbles are compressed and deformed or partially rupture within the particle gaps, the released trace amounts of energy create instantaneous turbulent pulsations at the microscale, further enhancing the mixing conditions near the particle surface. Additionally, for porous materials, bubbles may carry trace amounts of gas into the particle micropores, altering the gas-liquid distribution within the pores, displacing the stagnant liquid in the static zones, and promoting the desorption and release of flavor compounds adsorbed on the pore walls into the liquid phase. The combined effect of these mechanisms transforms the material layer from a diffusion-dominated mode of static soaking to a dynamic convection mass transfer mode, significantly improving extraction efficiency.

[0059] (3) The bursting of bubbles releases energy near the liquid surface, further disturbing the material layer.

[0060] When a bubble completes its ascent and reaches the liquid surface, it undergoes a bubble bursting process, releasing energy at the gas-liquid interface and causing additional disturbance to materials floating or near the liquid surface.

[0061] Specifically, after a bubble reaches the liquid surface, the liquid film above it gradually thins and eventually ruptures under the influence of surface tension. At the moment of rupture, the surface energy stored in the bubble is rapidly released, triggering microjets, droplet splashing, and local pressure fluctuations. Although this energy release is microscopic, it manifests macroscopically as a continuous boiling-like disturbance on the liquid surface.

[0062] For materials suspended near the liquid surface (such as fine coffee powder or coffee oil), the impact of bursting bubbles can re-enter the bulk liquid phase, preventing them from remaining on the surface and escaping the extraction medium. Simultaneously, the continuous impact of bubbles disrupts any foam or surface crust that may form at the liquid surface, maintaining effective contact between the gas, liquid, and solid phases. Furthermore, the droplets and disturbances generated during bubble bursting further increase the interface between the gas and liquid phases, facilitating the release of volatile aroma components (such as terpenes, furans, pyrazines, aldehydes, and ketones) from the liquid phase to the gas phase, enhancing aroma perception.

[0063] (4) Dynamic channel reconstruction to achieve uniformity of flow path within the material layer.

[0064] Specifically, as the bubbles rise continuously, their paths are not fixed but rather randomly distributed. Each bubble creates a tiny upward channel within the material layer, and these new channels become the preferred path for liquid flow in the next extraction cycle. This process disrupts the fixed flow channels that might have formed in the previous cycle, achieving dynamic channel reconstruction. The opening of new channels allows the liquid to reach areas that were not previously adequately contacted. As the number of cycles increases, new channels are continuously opened, the area of ​​material contacted by the liquid becomes wider and wider, and the uniformity of coverage continuously improves, effectively suppressing the polarization between localized over-extraction and under-extraction.

[0065] The above four effects work together to enhance the mass transfer process, allowing the flavor compounds inside the material to be released into the water more quickly and fully, thereby increasing the concentration and flavor fullness of the extract.

[0066] The working process of the cyclic extraction is as follows: the pumping device works → liquid enters the inner cup 21 → liquid immersion extraction → bubble extraction → the pumping device stops → liquid flows back to the outer cup 22 → two-stage mixing and dilution → pumping again, and so on for many times until the extraction is completed.

[0067] The core logic of single loops and multiple loops is as follows: ① Single cycle execution: After the air extraction device is started, relying on V y <V S The volume matching relationship is such that all the liquid in the first outer volume 221 of the outer cup 22 enters the inner cup 21, and the liquid immersion extraction is completed first to fully wet the material. After the liquid level in the outer cup 22 drops to the second reference surface L2, the bubble extraction stage is entered. The single flavor extraction is completed through the quadruple mass transfer enhancement effect of the bubbles. After the pumping device stops, the high-concentration extract in the inner cup 21 flows back to the outer cup 22 through the bottom connecting hole 24 under the action of gravity.

[0068] ② Two-stage mixing and dilution: After the refluxed high-concentration extract enters the outer cup 22, it undergoes two-stage dilution: In the first stage, the high-concentration extract preferentially enters the second outer container 222 and undergoes initial uniform mixing with the low-concentration residual liquid in this area that did not participate in the single extraction, thus achieving the initial dilution of the high-concentration extract; In the second stage, the initially diluted liquid diffuses upward and undergoes secondary global mixing with the low-concentration liquid in the first outer container 221, so that the overall liquid concentration in the outer cup 22 decreases uniformly.

[0069] ③Mass transfer driving force maintenance in multiple cycles: Based on the above two-stage mixing and dilution mechanism, after each cycle, the liquid about to enter the inner cup 21 in the outer cup 22 always maintains a low concentration, forming a continuous high concentration gradient with the concentration of flavor substances inside the material; according to Fick's diffusion law, the high concentration gradient can drive the flavor substances inside the material to continuously diffuse into the liquid phase, solving the problem of mass transfer driving force decay and extraction stagnation caused by rapid saturation of liquid phase concentration in traditional static soaking.

[0070] ④ Stability assurance of the cyclic process: Based on the limiting volume matching relationship of V1 < V2, there is no irreversible loss such as liquid overflow or pipeline suction in the extraction system during multiple cycles. Combined with the liquid-to-material ratio design of Vy > m × kVn, even after the material is saturated with water, there is still a sufficient amount of free-flowing liquid in the outer cup 22. This ensures that the liquid level in the outer cup 22 can drop below the second reference surface L2 with each pumping, stably triggering the two-stage process of liquid immersion extraction + bubble extraction. The extraction process will not fail due to the increase in the number of cycles, achieving stable and efficient extraction with multiple cycles.

[0071] In some embodiments of this application, such as Figures 6-9 As shown, the outer cup 22 has a first reference surface L1, and the liquid that the outer cup 22 can hold is no higher than the first reference surface L1. When the lid 23 is installed on the open end of the outer cup 22, the inner cup 21 is located inside the outer cup 22, and the bottom of the inner cup 21 is connected to the outer cup 22; the inner cup 21 is divided into a first content portion 211 and a second content portion 212 by the first reference surface L1; wherein, the first outer content portion 211 surrounds the second content portion 212. The first content portion 211 is located above the first reference surface L1, and the second content portion 212 is located below the first reference surface L1. That is, the portion of the inner cup 21 located above the first reference surface L1 is denoted as the first content portion 211; the portion of the inner cup 21 located below the first reference surface L1 is denoted as the second content portion 212. During extraction, the liquid in the outer cup 22 enters the inner cup 21 to soak the material in the inner cup 21; the high-concentration liquid after soaking can flow back into the outer cup 22 through the connecting hole 24 at the bottom of the inner cup 21 to mix with the original liquid in the outer cup 22. The bottom of the inner cup 21 has multiple connecting holes 24.

[0072] In the above technical solution, the presence of the first internal section 211 extends the volume of the inner cup 21 upwards, allowing the liquid to rise above the first reference surface L1 during evacuation, thus fully or mostly wetting the material contained in the inner cup 21. This avoids the problem of insufficient extraction of the upper layer material due to insufficient liquid level in traditional extraction devices 2, resulting in a more uniform extraction degree for all parts of the material. When the evacuation device is activated, the air pressure in the inner cup 21 decreases, and liquid flows from the outer cup 22 into the inner cup 21. On the one hand, the presence of the first internal section 211 extends the volume of the inner cup 21 upwards, allowing the liquid to rise above the first reference surface L1 during evacuation; simultaneously, the first internal section 211 increases the effective volume of the inner cup 21, allowing more liquid to be introduced into the material area during a single evacuation process, ensuring sufficient liquid immersion of the material and improving overall extraction uniformity. Secondly, during the extraction process, the rate of solute diffusion from the material to the liquid is related to the concentration gradient and contact area. The inner cup 21 is provided with a first internal section 211, which allows a larger amount of liquid to enter the inner cup 21 from the outer cup 22. This results in a larger liquid volume corresponding to a unit mass of material, a slower increase in solute concentration in the liquid, and a greater mass transfer driving force. The material and liquid are in more complete contact, reducing local saturation and improving extraction efficiency.

[0073] Please refer to some embodiments of this application. Figures 3-5 As shown, the bottom of the inner cup 21 is provided with a first filter screen 291, and multiple mesh holes are formed on the first filter screen 291; among them, the connecting hole 24 is a mesh hole of the first filter screen 291.

[0074] In the above technical solution, the connecting structure (connecting hole 24) at the bottom of the inner cup 21, which connects to the outer cup 22, consists of numerous tiny mesh openings on the first filter screen 291. Liquid and gas enter and exit evenly through multiple channels. During reflux, liquid seeps out simultaneously from various points at the bottom of the inner cup 21 and is evenly distributed in the outer cup 22, avoiding localized impact. During bubble impact, air enters simultaneously through each mesh opening, forming multi-point bubble formation. The bubble cluster rises evenly from various positions at the bottom, achieving comprehensive and thorough agitation of the material layer. When the liquid rises, liquid enters evenly through various mesh openings in the outer cup 22, ensuring the material is evenly wetted and preventing localized over-wetting or drying.

[0075] Furthermore, when air enters the inner cup 21 through the fine mesh of the first filter 291, it is cut into numerous tiny bubbles by the edges of the mesh. These tiny bubbles have a large specific surface area, multiplying the gas-liquid contact area and enhancing the gas's disturbance of the liquid. The slow rising speed of these tiny bubbles allows them to remain in the liquid for a longer period, continuously acting on the material layer. The large number of bubbles provides gentle and comprehensive agitation of the material, preventing localized violent impacts that could lead to material breakage or excessive fine powder production.

[0076] In some embodiments of this application, a second filter screen 292 is provided on the peripheral wall of the inner cup 21. The aperture of the first filter screen 291 is denoted as the first diameter D1; the aperture of the second filter screen 292 is denoted as the second diameter D2; D1 > D2. The first diameter D1 and the second diameter D2 refer to the average aperture of the corresponding filter screen apertures.

[0077] In the above technical solution, the inner cup 21 is simultaneously equipped with a bottom first filter screen 291 and a peripheral wall second filter screen 292, forming a multi-channel liquid inlet layout with a bottom main liquid inlet and a peripheral auxiliary liquid inlet, which significantly increases the total flow area of ​​liquid entering the inner cup 21. Compared with a single bottom liquid inlet structure, a faster liquid inlet speed can be achieved under the same negative pressure conditions, shortening the time for the liquid to completely wet the material and improving the overall extraction efficiency.

[0078] Secondly, the liquid simultaneously flows from the bottom upwards and from the sides towards the center into the inner cup 21, forming a cross-convective water flow field that comprehensively washes and disturbs the coffee grounds and other materials. This effectively breaks up material clumps, avoids dead material zones, and ensures that every particle of material can fully contact the extract. This effectively solves the problems of insufficient local extraction and uneven overall extraction caused by traditional unidirectional liquid injection, significantly improving the extraction rate of active ingredients and the consistency of the finished product's taste.

[0079] Furthermore, the pore size of the first filter screen 291 at the bottom is larger than that of the second filter screen 292 on the periphery (D1 > D2), resulting in a distribution of liquid flow resistance characterized by low resistance at the bottom and high resistance on the periphery. During the vacuum extraction and degassing stage, the liquid in the outer cup 22 will preferentially flow into the inner cup 21 through the larger-pore bottom filter screen with lower resistance, forming a powerful, penetrating water flow from bottom to top that directly penetrates the entire coffee grounds layer. Compared to circumferential side flow, this penetrating water flow can penetrate deeper into the interior of the material particles, dissolving flavor substances in the coffee more efficiently and significantly improving extraction depth and efficiency.

[0080] Furthermore, during the stage where vacuuming stops and the liquid flows back into the outer cup 22, due to the larger pore size of the bottom filter and the lower resistance to liquid flow under gravity, the extract in the inner cup 21 will mainly slowly precipitate and flow back through the bottom filter, rather than rapidly flowing out through the small-pore filter on the periphery. This technical solution forcibly extends the residence time of the liquid in the coffee grounds layer, allowing for more thorough soaking and extraction of the liquid and coffee grounds, further releasing the effective components and increasing the concentration and flavor richness of the extracted product.

[0081] Please refer to some embodiments of this application. Figure 5 As shown, the distance between the second filter screen 292 and the plane containing the opening of the inner cup 21 is denoted as the first distance J1, and the distance between the second filter screen 292 and the bottom wall of the inner cup 21 is denoted as the second distance J2; where J1 > J2.

[0082] In the above technical solution, during the extraction and liquid feeding stage, the circumferential liquid feeding height is limited by setting the position of the second filter screen 292, forcing the liquid to penetrate the material layer throughout the entire process.

[0083] Specifically, the second filter 292 is installed at a lower position, making most of the upper peripheral wall of the inner cup 21 a closed structure without pores, with a circumferential liquid inlet channel only in the lower region near the bottom wall. Combined with the design where D1 > D2 (the mesh size of the bottom first filter 291 is larger than that of the peripheral wall second filter 292), the liquid flow resistance exhibits a gradient distribution: the lowest resistance at the bottom, followed by the lower peripheral wall resistance, and then infinite resistance at the top peripheral wall. Therefore, during vacuum pumping, most of the liquid in the outer cup 22 will preferentially enter the inner cup 21 through the bottom first filter 291, with only a very small amount of liquid entering through the lower peripheral wall second filter 292, completely eliminating the problem of liquid directly flowing into the upper peripheral wall of the inner cup 21 and bypassing most of the material layer.

[0084] After entering from the bottom of the inner cup 21, the liquid must penetrate vertically through the entire thickness of the material layer from bottom to top to reach the upper space of the inner cup 21. Compared to the scheme where the second filter 292 is installed in the center or at the top, this design increases the average penetration path length of the liquid, allowing each drop of extract to have more complete and deeper contact with the material particles, significantly improving the dissolution rate of the active ingredients.

[0085] During the reflux phase, the circumferential liquid discharge height is limited by setting the position of the second filter screen 292, forcing the liquid to slowly precipitate from the bottom.

[0086] Specifically, during the process of stopping the pumping and the liquid beginning to flow back into the outer cup 22, when the liquid level is higher than the top edge of the second filter screen 292, the liquid can flow out simultaneously from the bottom first filter screen 291 and the circumferential wall second filter screen 292, resulting in a relatively fast backflow rate and allowing for the rapid completion of most of the liquid's backflow. When the liquid level drops from the top edge of the second filter screen 292 to its bottom edge, the effective flow area of ​​the circumferential channel (second filter screen 292) decreases linearly, and the bottom first filter screen 291 gradually becomes the main liquid outlet channel, significantly slowing down the backflow rate. The remaining small amount of liquid slowly permeates through the material layer under the influence of gravity. When the liquid level is lower than the bottom edge of the second filter screen 292, the circumferential channel (second filter screen 292) is completely closed, and the liquid can only flow out from the bottom first filter screen 291, significantly slowing down the backflow rate. The remaining small amount of liquid slowly permeates through the material layer under the influence of gravity.

[0087] The above reflux process forms a reflux pattern of fast at the beginning and slow at the end, which not only ensures the overall reflux efficiency, but also avoids the rapid loss of extract in the later stage of reflux, allowing the middle and lower material particles, which are originally prone to insufficient extraction, to be more fully soaked and extracted with the liquid.

[0088] Furthermore, the aperture difference between J1>J2 and D1>D2 works together to form a liquid flow control mode in which the liquid inlet is concentrated at the bottom and the liquid outlet is also concentrated at the bottom. The two work together to maximize the effective contact path and duration of the liquid in the material layer without reducing the overall speed of liquid inlet and reflux, thereby improving the extraction efficiency and ensuring the uniformity and consistency of the extracted product.

[0089] In some embodiments of this application, such as Figures 6-9 As shown, the second outer portion 222 is located below the second reference surface L2.

[0090] In the above technical solution, the second outer container 222 is located below the bottom of the inner cup 21, adjacent to the communication hole 24 between the inner cup 21 and the outer cup 22. When the suction device creates a negative pressure by evacuating the inner cup 21, the liquid in the outer cup 22 is forced into the inner cup 21 under the action of the pressure difference. Since the liquid in the second outer container 222 is at the lowest position and closest to the communication hole 24, this part of the liquid will be preferentially drawn into the inner cup 21. This priority setting allows the liquid in the second outer container 222 to quickly enter the inner cup 21 to wet the material at the beginning of extraction, avoiding delays or insufficient liquid supply caused by the liquid needing to flow from a distant position. At the same time, since the first outer container 221 is located above the bottom of the inner cup 21, the liquid in the first outer container 221 needs to overcome gravity or wait for the liquid level in the second outer container 222 to drop before it can enter the inner cup 21, forming a natural liquid supply sequence.

[0091] Secondly, during the evacuation process, the liquid in the second outer container 222 is preferentially drawn into the inner cup 21. However, since the liquid needs to overcome gravity to flow upwards from this area into the inner cup 21, and the pressure difference created by the evacuation is limited, when the liquid level in the second outer container 222 drops to near the connecting hole 24, the pressure difference is insufficient to continue lifting the remaining liquid into the inner cup 21. Therefore, the second outer container 222 will always retain some liquid and will not be completely evacuated. This characteristic directly avoids the risk of the liquid in the outer cup 22 being evacuated dry, ensuring that there is always liquid in the outer cup 22 available for reflux mixing after each evacuation.

[0092] Please refer to Figure 9As shown, after the vacuum device stops working, the air pressure in the inner cup 21 rises, the liquid level in the inner cup 21 drops, and the liquid in the inner cup 21 enters the outer cup 22 through the connecting hole 24 at the bottom, causing the liquid level in the outer cup 22 to rise. When multiple-cycle extraction is used, after the vacuum stops, the extract in the inner cup 21 flows back to the outer cup 22 under gravity, mixing with the low-concentration liquid remaining in the second outer container 222, thus diluting the overall liquid concentration in the outer cup 22. During the next vacuum cycle, the liquid concentration forced into the inner cup 21 is relatively low, maintaining a large concentration difference with the material, thereby maintaining a high mass transfer driving force. This two-stage mixing mechanism makes the liquid concentration in the outer cup 22 more uniform after reflux, and the dilution effect more significant, preparing a lower concentration extract for the next cycle and continuously maintaining a high mass transfer driving force; this mechanism allows each cycle to be carried out at a high extraction rate, and the overall extraction efficiency is significantly higher than that of traditional one-time static extraction or rapid concentration saturation cyclic extraction methods.

[0093] In some embodiments of this application, the volume of the first outer portion 221 is denoted as V1, and the volume of the first inner portion 211 is denoted as V2; wherein, V1 < V2. It should be noted that the above V1 and V2 satisfying the relationship of V1 < V2 specifically refers to the initial assembly state before the air extraction procedure is started and before negative pressure is applied.

[0094] The above technical solution, through the limiting volume matching of V1 < V2, provides a guarantee for extreme usage scenarios where the outer cup 22 is filled to its maximum liquid level. This ensures that even after the maximum liquid volume of the outer cup 22 enters the inner cup 21, it can still be completely contained within the first inner chamber 211 of the inner cup 21, preventing the liquid level from reaching the top of the inner cup 21. This prevents liquid overflow and environmental pollution, and also prevents liquid from entering the suction device and causing equipment damage. Secondly, this volume relationship ensures that the maximum liquid volume surrounding the outer cup 22 can all enter the inner cup 21, and the liquid level in the outer cup 22 will inevitably drop below the connecting structure (connecting hole 24), providing absolute certainty for triggering the bubble extraction stage. Simultaneously, the design of the first inner chamber 211 extends the effective volume of the inner cup 21 upwards, allowing the liquid level to rise above the maximum liquid level of the outer cup 22 during suction, completely immersing all the material in the inner cup 21 and solving the problem of insufficient extraction caused by the upper layer material not being able to fully contact the liquid in traditional structures. Please refer to... Figure 8 As shown, liquid immersion extraction is performed before the critical state (when the liquid level in the outer cup 22 inevitably drops to the position of the connecting structure (connecting hole 24)) to fully wet the material; after the critical state, bubble extraction is performed to enhance mass transfer through the mechanical action of bubbles and interface renewal. After the connecting structure (connecting hole 24) is exposed, the drawn-in air forms a continuous upward flow of bubbles.

[0095] In some embodiments of this application, the lowest liquid level of the liquid contained in the outer cup 22 exceeds the second reference surface L2.

[0096] In the above technical solution, when the second outer container 222 is completely filled with liquid, this liquid is located directly below the connecting hole 24 at the bottom of the inner cup 21, with the distance between the liquid and the connecting hole 24 being zero or minimal. After the suction is activated, the negative pressure immediately acts on this liquid, and the liquid can be instantly forced into the inner cup 21 without any delay.

[0097] Simultaneously, since the liquid level has exceeded the second reference surface L2, a certain amount of liquid is also stored in the first outer container 221. When the liquid in the second outer container 222 is consumed, the liquid in the first outer container 221 can be continuously replenished into the area of ​​the second outer container 222 and then pressed into the inner cup 21, forming a continuous liquid supply. This initial state of the second outer container 222 being full of liquid while the first outer container 221 contains liquid ensures that there will be no interruption in the liquid supply during the initial stage of gas extraction, and the material can be continuously and stably wetted, avoiding uneven extraction caused by intermittent liquid supply.

[0098] For multiple extraction cycles, please refer to... Figure 9 As shown, after the pumping stops, the liquid in the inner cup 21 flows back to the outer cup 22 and mixes with the residual liquid in the outer cup 22. When the initial liquid level in the outer cup 22 exceeds the second reference surface L2, the initial liquid volume in the outer cup 22 is relatively large and is distributed in the first outer container 221 and the second outer container 222. After the pumping ends and reflux occurs, the high-concentration extract first enters the second outer container 222, where the original residual liquid (if there was any residue from the previous cycle) mixes with the reflux liquid. Because the volume of the second outer container 222 is relatively small, the mixing is more thorough and the dilution effect is more significant. The diluted liquid then mixes further with the liquid in the first outer container 221. This two-stage mixing mechanism makes the liquid concentration in the refluxed outer cup 22 more uniform, the dilution effect better, and prepares a lower concentration extract for the next cycle, maintaining a high mass transfer driving force.

[0099] In some embodiments of this application, the volume of liquid to be contained in the first outer container 221 is denoted as V. y The volume of the second content section 212 is denoted as V. n Among them, V y >kV n Where k is the ratio of the volume of water required for the material to become saturated to the volume of the material, kV n The amount of water required for the material to absorb water when the second content section 212 is full.

[0100] For the above technical solutions, Vy > kV nAt that time, the amount of liquid in the first outer container 221 is sufficient to meet the material's water absorption saturation requirements, so that the material in the second inner container 212 can fully absorb water, fully expand and wet, and the soluble substances inside the material can be fully released into the liquid, avoiding the residue of soluble substances inside the material due to insufficient water absorption, resulting in insufficient extraction and waste.

[0101] If V y ≤kV n The material cannot fully absorb water and become saturated, and some soluble substances inside the material cannot be released, resulting in insufficient extraction and low material utilization.

[0102] Additionally, V y >kV n This ensures that even after the material is saturated, there is still residual liquid (V). y -kV n This is used for extraction, and the remaining liquid serves as an effective extraction medium, carrying soluble substances to form an extract. The concentration of the extract is moderate, neither too low nor too high, which would affect the mass transfer driving force. If V y Only slightly greater than kV n The remaining liquid volume is small, the extract concentration is high, and the mass transfer driving force is small; if V y Significantly greater than kV n With a large amount of residual liquid, low extract concentration, and strong mass transfer driving force, extraction efficiency is higher.

[0103] The above settings satisfy the water absorption capacity when the second content section 212 is full of material, and therefore must also satisfy the water absorption capacity when the second content section 212 is not full of material.

[0104] In some examples of this application, 0.5 ≤ k ≤ 1. The value of k varies for different materials. Specifically, highly absorbent materials (such as certain tea leaves) may require a value close to V. n The required amount of water is 0.5 (k close to 1); materials with low water absorption (such as coarsely ground coffee) may require less water (k close to 0.5). The range of 0.5 ≤ k ≤ 1 covers the saturated water absorption range of mainstream materials such as coffee powder, tea leaves, and herbal teas in home extraction scenarios. A k value below 0.5 cannot meet the wetting requirements of materials with high water absorption, while a k value above 1 will result in an excessively high liquid-to-material ratio and insufficient extract concentration. This range can balance the saturated water absorption requirements and extraction concentration requirements of different materials.

[0105] In some embodiments of this application, the volume of liquid to be contained in the first outer container 221 is denoted as V. y The volume of the second content section 212 is denoted as V. n Among them, V y >m×k×V n , m≥1.5; where k is the ratio of the water volume required for the material to become saturated to the material volume, kVn The amount of water required for the material to absorb water when the second content section 212 is full.

[0106] The above technical solutions, when V y >m×kV n When m ≥ 1.5, the total liquid volume entering the inner cup 21 from the outer cup 22 will significantly increase during extraction. This increased liquid volume in the inner cup 21 results in a higher liquid-to-solid ratio, a larger liquid volume, a slower increase in solute concentration, and a longer duration of the concentration gradient between the material and the liquid. This leads to a sustained high mass transfer driving force, making it less likely for the liquid to reach saturation, allowing extraction to continue for a longer period without degradation. Furthermore, the increased liquid volume in the inner cup 21 during extraction results in a longer upward path for bubbles in the liquid during the bubble extraction stage, increasing the gas-liquid contact time. Simultaneously, the increased liquid volume in the inner cup 21 allows the liquid to accommodate more bubbles, increasing the number of contactes between bubbles and the material. The bubbles rise in a large volume of liquid, enhancing their ability to adsorb and carry flavor compounds.

[0107] Please refer to some embodiments of this application. Figures 2-3 As shown, the extraction device 2 includes a cover 27; the cover 27 is rotatably connected to the cup lid 23. The cup lid 23 is provided with a suction hole 231 communicating with the inner cup 21, and a vent hole 233 is provided on the cup lid 23 and communicating with the outer cup 22. The cover 27 is provided with a sealing part 28, which is a closed ring.

[0108] When the lid 27 is engaged with the cup lid 23, the sealing part 28 engages with the cup lid 23, and the sealing part 28 surrounds the air extraction hole 231 and the vent hole 233; the sealing part 28, the cup lid 23, and the lid 27 together define the first cavity 20; the internal space of the inner cup 21 is connected to the outer cup 22 through the air extraction hole 231, the first cavity 20, and the vent hole 233.

[0109] In the conventional operation process where the user does not open the lid 27 (the lid 27 and the cup lid 23 are sealed together), the above technical solution relies on the through air passage of inner cup 21 → air extraction hole 231 → first cavity 20 → vent hole 233 → outer cup 22, and the connecting structure (connecting hole 24) between the bottom of inner cup 21 and outer cup 22, to automatically complete the bidirectional gas-liquid exchange: the liquid in outer cup 22 flows into the interior of inner cup 21 through the bottom of inner cup 21, and the normal pressure air inside inner cup 21 is simultaneously discharged smoothly through the above air passage to the normal pressure space above the liquid surface of outer cup 22, without the need for the user to open the lid to release air.

[0110] Without this air passage, when the inner cup 21 of the closed cover 27 is placed into the outer cup 22, the air inside the inner cup 21 cannot be expelled, and the liquid cannot enter the inner cup 21. The entire volume of the inner cup 21 will be used to displace the liquid in the outer cup 22, causing the liquid level to rise rapidly and easily overflow. In this solution, the internal space of the inner cup 21 can simultaneously accommodate the liquid, significantly reducing the rise in the liquid level in the outer cup 22 when the inner cup 21 is placed in, and solving the problem of liquid overflow during the placement of the inner cup 21 due to the user adding too much water beforehand.

[0111] Users no longer need to precisely calculate and control the maximum amount of water added to the outer cup 22, and they don't need to worry about overflowing and soiling the table or damaging the equipment due to adding too much water. This simplifies the preparation steps before extraction, lowers the operating threshold, and greatly improves the convenience and experience of daily use.

[0112] The spill prevention function is achieved passively through the air path design of the structure itself, without relying on any electronic components or active user intervention. Whether the cover 27 is closed or open, it can automatically play the role of preventing spills when the inner cup 21 is placed. The structure is reliable and there is no additional burden of use.

[0113] This avoids short circuits, corrosion, and other malfunctions caused by liquid spills seeping into electrical components such as the air extraction device. It also reduces safety hazards such as slipping caused by liquid spills and extends the overall service life of the equipment.

[0114] Please refer to some embodiments of this application. Figures 2-3 As shown, the cup lid 23 has a pressure relief hole 232 that communicates with the inner cup 21. When the lid body 27 is fitted with the cup lid 23, the sealing part 28 fits into the cup lid 23, and the sealing part 28 surrounds the pressure relief hole 232. The cross-sectional area of ​​the pressure relief hole 232 is denoted as S1, the cross-sectional area of ​​the vent hole 231 is denoted as S2, and the cross-sectional area of ​​the vent hole 233 is denoted as S3; wherein, S1 < S2 < S3. The cross-sectional areas of the pressure relief hole 232, vent hole 231, and vent hole 233 all refer to the minimum flow cross-sectional area of ​​the corresponding channel.

[0115] In the above technical solution, during extraction, the cover 27 is opened, and both the pressure relief hole 232 and the vent hole 233 are connected to the outside. The suction hole 231 serves as the main suction channel to draw negative pressure from the inner cup 21. Because S2 > S1, the ventilation cross-section of the suction hole 231 is larger than that of the pressure relief hole 232. The suction device can efficiently draw air from the inner cup 21 through the suction hole 231, quickly forming a stable negative pressure. This ensures that the liquid in the outer cup 22 flows smoothly into the inner cup 21 through the bottom of the inner cup 21, fully wetting the material and ensuring the basic efficiency of vacuum extraction. At the same time, the pressure relief hole 232 has the smallest diameter and limited air intake, which can prevent a large amount of external gas from rushing back and offsetting the negative pressure in the inner cup 21, preventing the negative pressure from decaying too quickly, and keeping the negative pressure in the inner cup 21 within a reasonable range. This allows the liquid to enter slowly and evenly, avoiding the problem of material dispersion and uneven extraction caused by the liquid rapidly splashing onto the material.

[0116] After the evacuation stops, air is introduced into the inner cup 21 through the pressure relief hole 232 to increase the internal air pressure, thereby driving the liquid in the inner cup 21 to flow back to the outer cup 22. Since S1 is the smallest cross-section, the outside gas can only enter the inner cup 21 in a small flow rate and slowly. The air pressure in the inner cup 21 gradually rises at a uniform speed, without instantaneous pressure increase. Correspondingly, the liquid level in the inner cup 21 drops slowly and steadily, effectively preventing sudden liquid drop impact, splashing, and residual liquid dripping from the wall. The reflux process is quiet and clean, improving the user experience.

[0117] The vent 233 has the largest cross-sectional area (S3 > S2), and is fully connected to the outside. It can quickly balance the air pressure in the area where the cover 27 is fitted and the upper space of the outer cup 22, ensuring that the outer cup 22 always maintains a normal pressure environment and eliminating the problems of air pressure stagnation and blockage. On the one hand, it provides a stable air pressure prerequisite for the continuous and smooth flow of liquid from the outer cup 22 into the inner cup 21. On the other hand, it avoids the impact of local air pressure accumulation on the entire set of actions of evacuation, depressurization, and return, ensuring smooth air flow throughout the entire process.

[0118] The vent 233 can also serve as a direct drinking port. The large-diameter S3 design is adapted to the flow requirements of drinking water, ensuring smooth and unobstructed drinking water flow. At the same time, combined with the pore size gradient division of the pressure relief port 232 and the air extraction port 231, the functions of main air extraction channel, micro-pressure stabilization and pressure relief, and large-diameter ventilation or drinking are distinguished. Without adding an additional independent structure, it simultaneously meets multiple usage scenarios such as extraction air extraction, pressure relief and reflux, and direct drinking. The structure has a high degree of integration and clear division of functions.

[0119] By using a differentiated cross-sectional design with S1 < S2 < S3, the functional positioning of different vents is precisely matched: the pressure relief vent 232 is mainly for micro-air intake, the air extraction vent 231 is mainly for high-efficiency air extraction, and the ventilation vent 233 is mainly for large-volume atmospheric pressure interconnection and drinking. The airflow of each vent does not interfere with each other and each performs its own function, so that the entire process of extraction, air extraction, pressure relief, reflux and drinking is connected and smooth, reducing the use failure caused by air pressure disturbance and improving the overall reliability of the device.

[0120] Please refer to some embodiments of this application. Figure 3 , Figures 6-9 As shown, the extraction device 2 includes a filter 25. The filter 25 is disposed inside the inner cup 21; wherein, the filter 25 is located inside the first inner contents 211 and above the material.

[0121] In the above technical solution, during the liquid immersion extraction stage, the liquid enters from the bottom of the inner cup 21 upwards, passes through the material layer, and flows upwards. At this time, the filter 25 is located above the material layer, which can effectively intercept the fine particles carried by the liquid, preventing them from entering the first inner chamber 211 of the inner cup 21 and the air extraction device, effectively protecting the air extraction device from particle damage, and also ensuring the cleanliness of the upper space of the inner cup 21.

[0122] During the bubble extraction stage, as bubbles pass through the mesh structure of filter 25, large bubbles are broken down into smaller bubbles. The total surface area of ​​the smaller bubbles is much larger than that of the larger bubbles, significantly increasing the gas-liquid contact area and improving mass transfer efficiency. Filter 25 also impedes the rise of bubbles, slowing their ascent speed in the liquid above the material layer, allowing for more sufficient contact time between the bubbles, liquid, and material. Filter 25 also ensures a more uniform distribution of bubbles across the cross-section, preventing bubbles from concentrating in a single area and resulting in more uniform extraction of the material from all parts.

[0123] In some embodiments of this application, such as Figure 6 As shown, the end face of the filter 25 near the bottom of the inner cup 21 is designated as the first end face P1; the first end face P1 is located on the side of the first reference surface L1 away from the bottom of the inner cup 21.

[0124] The distance between the first end face P1 and the first reference face L1 is denoted as the first distance H1, where 1mm≤H1≤5mm.

[0125] The above technical solutions prevent particles from being carried into the mesh of filter 25 due to capillary effect during initial contact with the liquid, thus keeping filter 25 clean. The material layer located between the first end face P1 and the first reference face L1 serves as a pre-filtration layer, intercepting most coarse particles and reducing the load on filter 25. Filter 25 starts working in a clean state, and the amplification effect of the finer particles as air bubbles pass through filter 25; pressure-driven liquid flow replaces capillary wetting, reducing the risk of particle embedding.

[0126] The 1mm≤H1≤5mm limit defines the minimum distance between the liquid and the filter 25 in the initial state as 1mm to 5mm, within which the material is in a dry state when filled.

[0127] When the dry filter 25 first comes into contact with the liquid, the liquid quickly wets the mesh of the filter 25 under the action of surface tension. If the liquid contains fine particles, these particles are easily pulled into the mesh and become stuck due to surface tension, causing initial blockage. When H1 ≥ 1 mm, a dry material layer can exist between the liquid and the filter 25 in the initial state, and the liquid must wet the material layer before reaching the filter 25. When the liquid finally contacts the filter 25, it is a pressure-driven flow rather than capillary wetting, which reduces the probability of particles getting stuck in the mesh. The dry material layer has a certain interception effect on coarse particles in the liquid; some particles are captured by the material layer, reducing the number of particles reaching the filter 25.

[0128] When H1 ≤ 5 mm, the material layer thickness is moderate, and the particles have a shorter path during ascent, preventing excessive collisions and the generation of too many ultrafine particles, which helps control the total amount of ultrafine particles in the liquid. Furthermore, the space occupied by the material in the first inner chamber 211 is limited, leaving sufficient space to accommodate the liquid entering from the outer cup 22. This synergizes well with the V1 < V2 volume relationship, ensuring safe liquid containment.

[0129] If H1 < 1 mm, the liquid is too close to the filter 25, resulting in a high particle content upon initial contact, which may cause capillary clogging. If H1 > 5 mm, the material layer is too thick. Although the filter 25 is initially clean, the liquid needs to pass through a thicker material layer to reach the filter 25. During the ascent, particles may be excessively collided and broken, generating more ultrafine particles, which actually increases the burden on the filter 25. In addition, if the material occupies too much space in the first internal compartment 211, it may disrupt the safe liquid containment balance defined by V1 < V2.

[0130] In some embodiments of this application, the volume of the inner cup 21 is denoted as the second volume V. Z2 The volume between the outer cup 22 and the inner cup 21 is denoted as the first volume V. Z1 Among them, the second volume V Z2 Less than the first volume V Z1 .

[0131] In the above technical solution, the outer cup 22 has a larger volume, which can hold more low-concentration liquid; the high-concentration liquid returning is diluted by the larger volume of low-concentration liquid, resulting in a better dilution effect; the liquid entering the inner cup 21 in the next cycle has a lower concentration, resulting in a greater mass transfer driving force.

[0132] Please refer to some embodiments of this application. Figure 3 , Figures 6-9 As shown, the filter 25 has a protrusion 26 on the top side near the cup lid 23; the top of the protrusion 26 cooperates with the cup lid 23 to limit the relative position of the filter 25 and the top of the cup lid 23.

[0133] In the above technical solution, the top of the protrusion 26 on the top of the filter 25 directly engages and limits the bottom of the cup lid 23, eliminating the need for additional fixing structures such as slots or buckles on the inner wall of the inner cup 21. When the cup lid 23 and the inner cup 21 are assembled, the protrusion 26 automatically presses and fixes the filter 25 at a preset height above the material, realizing the linkage assembly of installing the cup lid 23 and the filter 25, greatly simplifying the assembly steps; at the same time, it can completely resist the force generated by the upward flow of liquid during suction and the downward impact of liquid during recirculation, preventing the filter 25 from moving up and down or tilting, ensuring that the filter surface always horizontally covers the cross-section of the inner cup 21, and avoiding edge leakage.

[0134] Secondly, the filter 25 is pressed on top of the material, which can effectively prevent light materials (such as tea leaves and herbal teas) from floating to the surface of the liquid when the liquid flows in, ensuring that all materials are always completely submerged in the extract, avoiding the problem of insufficient extraction and uneven taste caused by some materials not being in sufficient contact with the liquid, thus improving extraction efficiency and product consistency.

[0135] In addition, the filter 25 has a simple structure that is easy to clean and has no blind spots. It is only connected to the cup lid 23 by the top protrusion 26 without any snap-fit ​​or complicated connection structure. When disassembling, simply remove the cup lid 23 to easily remove the filter 25 from the inner cup 21 for separate cleaning. There are no gaps for dirt to accumulate, making cleaning thorough and convenient.

[0136] In some embodiments of this application, the top of the protrusion 26 makes single-point / multi-point contact with the cup lid 23. In the above technical solutions, the protrusion 26 uses a single-point / multi-point contact limiting method at its top, rather than the entire top surface of the filter 25 being fitted to the cup lid 23. This creates a uniform gas flow gap between the top surface of the filter 25 and the bottom surface of the cup lid 23. This gas flow gap ensures complete communication between the suction hole 231 and the pressure relief hole 232 on the cup lid 23 and the interior of the inner cup 21. The filter 25 will not block the airflow, and the original core functions such as establishing negative pressure through suction, liquid return after pressure relief, and preventing overflow when the inner cup 21 is placed are not affected.

[0137] In some embodiments of this application, the air extraction device is provided on the door 102 or the cabinet 101 of the refrigerator 100.

[0138] Please refer to some embodiments of this application. Figure 12As shown, the extraction device includes a docking part 32 for connecting to the extraction device 2. The extraction device also includes an extraction section 31 for extracting air from the extraction device 2 via the docking part 32. The extraction device includes an extraction pipe 33 connecting the extraction section 31 and the docking part 32. The extraction device also includes a pressure relief component 34 connected to the extraction pipe 33. When the docking part 32 is connected to the extraction device 2, the extraction section 31 operates, causing the liquid in the inner cup 21 of the extraction device 2 to soak the material and extract its flavor.

[0139] The above technical solution, through the micro-pressure regulation of the pressure relief component, can buffer the pressure fluctuations generated by the operation of the extraction section, reduce the pressure oscillations caused by intermittent extraction, and maintain a constant negative pressure in the inner cup of the extraction device. Under a stable and moderate negative pressure environment, the material is fully wetted by the liquid, allowing the liquid to penetrate evenly into the pores of the material. This avoids defects such as insufficient wetting and uneven extraction caused by sudden pressure fluctuations, ensuring a stable and uniform precipitation of flavor substances.

[0140] As soon as or shortly after the exhaust unit 31 stops working, the pressure relief component 34 is opened, allowing outside air to quickly enter the extraction device 2 through the exhaust pipe 33, instantly balancing the internal and external air pressures. After the negative pressure is quickly eliminated, the liquid in the inner cup 21 immediately begins to flow back under the action of gravity, significantly shortening the reflux start-up time and significantly increasing the reflux speed.

[0141] After the extraction unit 31 stops, a small amount of extract droplets may remain on the inner wall of the extraction pipe 33. Without the pressure relief device 34, when the extraction unit 31 is restarted, these residual liquids may be directly drawn into the extraction unit 31. Long-term accumulation can lead to bacterial growth, odor, and even damage to the extraction unit 31. Simultaneously, the dirt formed by the dried extract droplets in the extraction pipe 33 can also affect the purity of subsequent extractions. When the pressure relief device 34 is opened, outside air enters the extraction pipe 33, creating an airflow purging effect—the flowing air can blow the residual liquid adhering to the inner wall of the extraction pipe 33 back to the extraction device 2 or discharge it, reducing the residence time of the residual liquid in the extraction pipe 33. Opening the pressure relief device 34 after each soaking keeps the extraction pipe 33 relatively dry and clean, preventing residual liquid from contaminating the extraction unit 31, extending the life of the components, and ensuring the hygiene and safety of the next extraction.

[0142] Please refer to some embodiments of this application. Figures 10-11 As shown, the refrigerator 100 includes a housing section 103; an air extraction section 31 and a pressure relief component 34 are located inside the housing section 103. The air extraction section 31 discharges the gas extracted from the extraction device 2 into the housing section 103; the pressure relief component 34 is used to control the connection or disconnection between the air extraction pipe 33 and the housing section 103.

[0143] The air extraction device includes a purification module, which is installed inside the receiving part 103 to purify the gas inside the receiving part 103.

[0144] The above technical solution places the exhaust port of the extraction unit 31 inside the receiving section 103. The gas extracted by the extraction unit 31 is preferentially discharged directly into the cavity defined by the receiving section 103, and will not directly diffuse to other areas of the refrigerator 100. At the same time, the purification module continuously treats the gas in the receiving section 103, adsorbing or decomposing odor molecules, making the gas fresh within the receiving section 103. By placing both the purification module and the extraction unit 31 inside the receiving section 103, the pollution of the refrigerator 100 and the indoor environment by extracted odors is fundamentally eliminated.

[0145] Furthermore, the pressure relief component 34 controls the connection between the suction pipe 33 and the receiving section 103. When the pressure relief component 34 is opened, the gas entering the suction pipe 33 comes from inside the receiving section 103. The gas inside the receiving section 103 is the clean air that was previously discharged by the suction section 31 and repeatedly processed by the purification module; this configuration ensures that the air entering the inner cup 21 has a high degree of cleanliness and is free of external contaminants. Even with multiple cycles, the liquid in the inner cup 21 is always in contact with clean air, avoiding secondary contamination. The flavor purity of the extract is guaranteed and is not affected by the external environment.

[0146] Please refer to some embodiments of this application. Figure 10 As shown, the refrigerator 100 includes a support base 104 for supporting the extraction device 2.

[0147] In the above technical solution, the support base 104 provides a fixed placement position for the extraction device 2. The horizontal reference plane of the support base 104 ensures that the extraction device 2 is always in a horizontal state, keeping the liquid levels of the inner cup 21 and the outer cup 22 horizontal, and ensuring the volume matching relationship (Vy < V). S First, it ensures accurate operation and prevents excessive local liquid level from overflowing; second, it ensures uniform liquid flow distribution in the first filter screen 291 and the second filter screen 292, avoiding one-sided liquid inflow / outflow due to tilting.

[0148] In some embodiments of this application, the support base is configured as a drip tray structure with a surrounding edge. The above technical solution allows the support base to catch small amounts of dripping liquid or condensate that may be generated during the extraction process, preventing the liquid from dripping directly onto the refrigerator liner and causing corrosion or contamination.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0150] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A refrigerator, characterized in that, include: Extraction apparatus, comprising: An outer cup is used to hold liquid; the outer cup is connected to the external environment through a vent. A cup lid that mates with the open end of the outer cup; The inner cup, the top of which is connected to the bottom of the cup lid, is used to hold materials; An air extraction device is used to extract air from the inner cup; The liquid level inside the outer cup is designated as the third reference surface (L3); the plane containing the bottom of the inner cup is designated as the second reference surface (L2). When the cup lid is installed on the open end of the outer cup, the inner cup is at least partially located inside the outer cup, the bottom of the inner cup is connected to the outer cup, and the second reference surface (L2) is located below the third reference surface (L3). The inner cup is divided into a first receiving portion and a second receiving portion by the third reference surface (L3); wherein the first receiving portion is located above the third reference surface (L3); The area of ​​the outer cup outside the inner cup is divided into a first outer container and a second outer container by the second reference surface (L2); wherein the first outer container is located above the second reference surface (L2); The volume of the first containment section is denoted as V. S The volume of liquid contained in the first outer container is denoted as V. y Among them, V y <V S ; When the pumping device is working, the liquid level in the outer cup gradually decreases, and the distance between the third reference surface (L3) and the second reference surface (L2) gradually decreases; after the liquid level in the outer cup drops to the second reference surface (L2), the pumping device continues to work, and gas enters the inner cup and passes through the material layer and liquid, generating bubbles; The outer cup has a first reference surface, and the liquid that the outer cup can hold is not higher than the first reference surface; When the cup lid is installed on the open end of the outer cup, the portion of the inner cup located below the first reference surface (L1) is referred to as the second content portion; The second internal section is used to hold materials, and its volume is denoted as V. n Among them, V y >kV n , where k is the ratio of the volume of water required for the material to become saturated to the volume of the material.

2. The refrigerator according to claim 1, characterized in that, The outer cup has a first reference surface, and the liquid that the outer cup can hold is not higher than the first reference surface; When the cup lid is installed on the open end of the outer cup, the portion of the inner cup located above the first reference surface (L1) is referred to as the first content portion; The volume of the first outer portion is denoted as V1, and the volume of the first inner portion is denoted as V2; Where V1 < V2.

3. The refrigerator according to claim 1, characterized in that, in, In y >m×kV n ,m≥1.5。 4. The refrigerator according to any one of claims 1 to 3, characterized in that, The extraction device includes a lid; the lid is rotatably connected to the cup lid. The cover is provided with a sealing part, which is in the form of a closed ring; The cup lid is provided with a suction hole that communicates with the inner cup, and the vent hole is located on the cup lid and communicates with the outer cup; When the lid body is engaged with the cup lid, the sealing part is engaged with the cup lid, and the sealing part surrounds the air extraction hole and the vent hole; the sealing part, the cup lid, and the lid body together define a first cavity; The internal space of the inner cup is connected to the outer cup through the air extraction hole, the first cavity, and the vent hole.

5. The refrigerator according to claim 4, characterized in that, The cup lid is provided with a pressure relief hole that communicates with the inner cup. When the lid body is engaged with the cup lid, the sealing part is engaged with the cup lid and surrounds the pressure relief hole. The cross-sectional area of ​​the pressure relief hole is denoted as S1, the cross-sectional area of ​​the air extraction hole is denoted as S2, and the cross-sectional area of ​​the vent hole is denoted as S3. Where S1 < S2 < S3.

6. The refrigerator according to claim 2, characterized in that, The extraction apparatus includes: A filter is disposed within the first content section; the filter is located above the material.

7. The refrigerator according to claim 6, characterized in that, The filter has a protrusion on the side near the top of the cup lid; The top of the protrusion engages with the cup lid to limit the relative position of the filter and the top of the cup lid.

8. The refrigerator according to claim 1 or 2, characterized in that, The bottom wall of the inner cup is provided with a first filter screen; A second filter screen is provided on the peripheral wall of the inner cup; Wherein, the aperture of the first filter screen is denoted as the first diameter D1; the aperture of the second filter screen is denoted as the second diameter D2; D1 > D2.

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