refrigerator

Abstract

This application belongs to the field of home appliance technology and provides a refrigerator, including a cabinet; a door; an extraction device detachably installed on the cabinet or door, the extraction device including an inner cup and an outer cup, the outer cup being connected to the external environment; the inner cup being at least partially located inside the outer cup; the side wall of the inner cup having a first through hole communicating with the interior of the outer cup; an air extraction device, disposed on the cabinet or door, including a connecting joint, an air extraction machine, and an air extraction pipeline, one end of the air extraction pipeline being connected to the air extraction machine, and the other end being connected to the connecting joint; the connecting joint being used to connect to the extraction device so that the air extraction machine can extract air from the inner cup; a controller is configured to: receive a start command and control the air extraction machine to work; liquid in the outer cup enters the inner cup through the first through hole, and the liquid level in the outer cup gradually decreases; when the liquid level in the outer cup decreases to be level with the first through hole, the air extraction machine is controlled to continue working, so that gas enters the inner cup through the first through hole to form bubbles, and the bubbles pass through the liquid and material in the inner cup.

Description

Technical Field

[0001] This application belongs to the field of home appliance technology, and more specifically, relates 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 refrigerator products are beginning to integrate simple beverage preparation functions. One common technical solution is to use negative pressure immersion extraction. This solution typically includes an inner cup and an outer cup that are connected to each other. A vacuum device is used to evacuate the inner cup, creating negative pressure. The liquid in the outer cup enters the inner cup under atmospheric pressure, fully contacting and immersing the ingredients (such as coffee powder or tea leaves) in the inner cup, thereby releasing the flavor compounds inside the ingredients.

[0004] During the release of deep flavor compounds from within the material, foam is easily generated on the surface of the liquid. The foam moves up and down under the impact of the liquid and gas, overflowing from the top. Summary of the Invention

[0005] The purpose of this application is to provide a refrigerator to solve the technical problem that foam easily overflows from the top of the existing extraction device.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a refrigerator, comprising: The container has a storage compartment; A door, connected to the box body, is used to open or close the storage room; An extraction device is detachably installed on the housing or the door. The extraction device includes an inner cup and an outer cup. The outer cup is connected to the external environment and is used to hold liquid. The inner cup is at least partially located inside the outer cup and is used to hold material. The side wall of the inner cup has a first through hole that communicates with the interior of the outer cup. An air extraction device is installed on the housing or the door. The air extraction device includes a docking joint, an air extraction machine, and an air extraction pipeline. One end of the air extraction pipeline is connected to the air extraction machine, and the other end is connected to the docking joint. The docking joint is used to connect to the extraction device so that the air extraction machine can extract air from the inner cup. A controller, electrically connected to the vacuum pump, is configured to: receive a start command and control the vacuum pump to operate; the liquid in the outer cup enters the inner cup through the first through hole, and the liquid level in the outer cup gradually decreases; when the liquid level in the outer cup decreases to be level with the first through hole, the controller controls the vacuum pump to continue operating, so that gas enters the inner cup through the first through hole to form bubbles, and the bubbles pass through the liquid and material in the inner cup.

[0007] Optionally, the bottom wall of the inner cup has a second through hole communicating with the interior of the outer cup, the diameter of the second through hole being r, and the diameter of the bottom wall of the inner cup being R, where r < R / 5.

[0008] Optionally, the extraction device further includes a filter, which is fitted inside the inner cup. The lower part of the filter forms a material hopper with the inner wall of the inner cup. A filter screen is installed in the first through hole and / or the second through hole, and the mesh size of the filter screen is not less than 200 mesh.

[0009] Optionally, the center of the bottom wall of the inner cup is located on the axis of the second through hole.

[0010] Optionally, the refrigerator further includes a vacuum storage device, both of which are detachably mounted on the cabinet or on the door; the docking connector is selectively connected to either the vacuum storage device or the extraction device; the controller is configured to, when the docking connector is connected to the vacuum storage device, control the vacuum pump to run for a first preset time and then shut it off; and when the docking connector is connected to the extraction device, control the vacuum pump to run intermittently a preset number of times.

[0011] Optionally, the pumping device further includes a pressure relief valve, which is disposed on the pumping pipeline. The controller is also configured to: when the docking joint is connected to the vacuum storage device, control the pressure relief valve to open for a first pressure relief duration and then close when the pump is shut down. And / or, when the docking joint is connected to the extraction device, the pressure relief valve is controlled to be open when the pump stops working during intermittent operation, and the pressure relief valve is controlled to be closed when the pump is working during intermittent operation and after operation.

[0012] Optionally, the door body is provided with a receiving cavity, the air pump and the pressure relief valve are located in the receiving cavity, the air pump discharges the gas it extracts into the receiving cavity; the pressure relief valve is used to control the connection and disconnection between the air extraction pipeline and the inside of the receiving cavity; The air extraction device also includes a purification module, which is installed inside the receiving cavity to purify the gas inside the receiving cavity.

[0013] Optionally, the suction device further includes a pressure sensor disposed on the suction pipeline for detecting the pressure in the suction pipeline, and the controller is electrically connected to the pressure sensor; the controller is configured to determine, based on the detection value of the pressure sensor, whether the device connected to the docking joint is the extraction device or the vacuum storage device. Alternatively, the pumping device may further include a pressure switch, the pumping line having a branch, the pressure switch being disposed on the branch and parallel to the pump; the controller being electrically connected to the pressure switch, the controller being configured to determine, based on the output signal of the pressure switch, whether the device connected to the docking joint is the extraction device or the vacuum storage device.

[0014] Optionally, the outer cup has a first reference surface L1, which is the highest liquid level that the outer cup can hold. The inner cup is divided into a first content section and a second content section by the first reference surface L1. The first content section is located above the first reference surface L1, and the second content section is located below the first reference surface L1 and is used to hold materials.

[0015] Optionally, the plane containing the bottom of the inner cup is denoted as the second reference plane L2, and 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 plane L2; the first outer container is located above the second reference plane L2, and the second outer container is located below the second reference plane L2; the volume of the liquid contained in the first outer container is denoted as Vy; the volume of the second inner container is denoted as Vn; where Vy > kVn, and k is the ratio coefficient of the water volume required for the material to absorb water to saturation to the material volume.

[0016] The beneficial effects of the refrigerator provided in this application are as follows: Compared with the prior art, when the liquid level in the outer cup of the refrigerator of this application drops and the first through hole is gradually exposed, the vacuum pump works, allowing gas to enter the inner cup and generate a large number of bubbles. The first through hole is located on the side wall of the inner cup. Compared with the way the bubbles enter the inner cup from the bottom wall of the inner cup, it can avoid the liquid surface from violently moving under the action of the bubbles, thereby reducing the possibility of foam overflowing from the top of the extraction device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a refrigerator provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the refrigerator provided in an embodiment of this application when the docking joint is connected to the extraction device.

[0020] Figure 3 This is a partially enlarged schematic diagram of a refrigerator provided in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the air extraction device used in the embodiments of this application.

[0022] Figure 5 This is a schematic diagram of the exploded structure of the extraction device used in the embodiments of this application.

[0023] Figure 6 This is a cross-sectional structural diagram of the extraction device used in the embodiments of this application.

[0024] Figure 7 This is a three-dimensional structural diagram of the inner cup used in the embodiments of this application.

[0025] Figure 8 This is a three-dimensional structural diagram of the inner cup used in another embodiment of this application.

[0026] Figure 9 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application when the docking joint is connected to a vacuum storage device.

[0027] Figure 10 This is a schematic diagram of the extraction device used in the embodiments of this application when it is filled with water.

[0028] Figure 11 This is a three-dimensional structural diagram of the extraction device used in the embodiments of this application during bubble impact.

[0029] Figure 12 This is a three-dimensional structural diagram of the extraction device used in the embodiments of this application during depressurization and reflux.

[0030] The following are the labeling elements in the figure: 101. Box body; 102. Door; 103. Receiving cavity; 104. Shelf; 2. Extraction device; 21. Inner cup; 22. Outer cup; 23. Cup lid; 231. Vent; 241. First through hole; 242. Second through hole; 25. Connecting part; 27. Filter; 211. First Content Section; 212. Second Content Section; 221. First External Content Section; 222. Second External Content Section; 3. Air extraction device; 31. Air extraction fan; 32. Connecting joint; 33. Air extraction pipeline; 34. Pressure relief valve; 35. Pressure switch; 4. Vacuum storage device. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] This application provides a refrigerator, as shown in the embodiments below. Figure 1As shown, the refrigerator includes a cabinet 101 and a door 102 connected to the cabinet 101. The cabinet 101 has a storage compartment, the door 102 is connected to the cabinet 101 to open and close the storage compartment, and a refrigeration unit supplies cold air to the storage compartment. The refrigerator can be a double-door refrigerator, a single-door refrigerator, a three-door refrigerator, or a French door refrigerator. Alternatively, it can be a French door refrigerator, i.e., the upper part is a double-door refrigerator compartment providing ample storage space for users, and the lower part is a drawer-style freezer compartment, making it easier to classify, store, and access frozen foods. The specific form is not limited in this embodiment.

[0036] The refrigerator body 101 includes an inner liner defining a storage compartment, an outer shell disposed outside the inner liner to form the appearance of a refrigerator, and a heat insulation layer disposed between the inner liner and the outer shell to insulate the storage compartment. A loading / unloading opening is formed at the front end of the storage compartment for placing or removing stored items from the storage compartment. A door 102 is rotatably connected to the refrigerator body 101 to open or close the loading / unloading opening of the storage compartment. The number of doors 102 may be one, two, or three, etc.

[0037] In some embodiments of this application, such as Figure 2 As shown, the refrigerator includes an extraction device 2, which is detachably mounted on the cabinet 101 or the door 102, for extracting materials such as coffee or tea. In some embodiments, such as Figure 2 As shown, the extraction device 2 is detachably mounted on the door 102. Specifically, as... Figure 2 As shown, a shelf 104 is provided on the inner side of the door 102, and the extraction device 2 is placed directly on the shelf 104. When disassembly is required, the extraction device 2 can be directly removed from the shelf 104. Alternatively, the door 102 is provided with a slot, in which the extraction device 2 is secured and positioned. When disassembly is required, the extraction device 2 can be pulled out of the slot. In some alternative embodiments, the extraction device 2 is mounted on the housing 101. For example, the extraction device 2 is placed in the storage compartment.

[0038] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the extraction device 2 includes an inner cup 21 and an outer cup 22. The outer cup 22 is connected to the external environment and is used to hold liquid. The inner cup 21 is at least partially disposed inside the outer cup 22 and is connected to the interior of the outer cup 22, and is used to hold material.

[0039] like Figure 5 and Figure 6 As shown, the extraction device 2 also includes a cup lid 23, which is matched with the open end of the outer cup 22. The cup lid 23 is provided with a vent hole 231. When the cup lid 23 is closed on the outer cup 22, the outer cup 22 can be connected to the external environment through the vent hole 231.

[0040] In some embodiments, the bottom of the inner cup 21 is provided with a filter element, which has a hopper for holding materials such as coffee powder, tea leaves, or traditional Chinese medicine. The filter element has multiple filter holes, allowing the hopper to communicate with the interior of the inner cup 21. Optionally, the filter element is a mesh-like box, detachably installed at the bottom of the inner cup 21, allowing the material in the hopper to be replaced by disassembly. In yet other embodiments, such as Figure 6 As shown, the extraction device 2 includes a filter 27. The filter 27 is fitted inside the inner cup 21 and, together with the bottom and side walls of the inner cup 21, forms a material storage bin. That is, the material is placed directly at the bottom of the inner cup 21, and the filter 27 limits the material's position, preventing it from rising under the influence of the liquid. During the extraction process, the liquid in the outer cup 22 enters the inner cup 21 to soak the material in the storage bin; the high-concentration liquid after soaking can flow back through the inner cup 21 to the outer cup 22 to mix with the original liquid in the outer cup 22.

[0041] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the inner cup 21 has a first through hole 241 on its side wall, but no through hole on its bottom wall. This prevents bubbles from rising straight up from the bottom of the inner cup 21, which would cause the bubbles to be generated too violently and cause the foam on the surface of the liquid inside the inner cup 21 to overflow from the cup lid 23.

[0042] In some embodiments, such as Figure 8 As shown, the inner cup 21 has a first through hole 241 on its side wall and a second through hole 242 on its bottom wall. The diameter of the second through hole 242 is r, and the diameter of the bottom wall of the inner cup 21 is R, where r < R / 5. By controlling the diameter of the second through hole 242, the generated bubbles are made smaller, avoiding violent disturbances caused by large bubbles and preventing foam from overflowing from the cup lid 23. Optionally, the second through hole 242 has a bore that passes through the center of the bottom wall of the inner cup 21.

[0043] In some embodiments of this application, when the extraction device 2 includes a filter 27, a filter screen is installed at the first through-hole 241 and / or the second through-hole 242, and the mesh size of the filter screen is not less than 200 mesh. For example, the mesh size of the filter screen is 200 mesh, 325 mesh, 480 mesh, etc. With a mesh size of not less than 200 mesh, when air enters the inner cup 21 through the fine mesh of the filter screen, it is cut into a large number of 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 to the liquid. The tiny bubbles rise slowly and remain in the liquid for a longer time, continuously acting on the material. The large number of bubbles provides gentle and comprehensive agitation of the material, avoiding localized violent impacts that could lead to material breakage or excessive fine powder production. Of course, a filter screen may not be provided at the through-hole; instead, a mesh filter element can be used to cut the bubbles. In some embodiments, Optionally, the number of first through holes 241 and second through holes 242 can both be multiple. Thus, by providing first through holes 241 and / or second through holes 242, liquid and gas can uniformly enter and exit between the inner cup 21 and the outer cup 22. Furthermore, during reflux, liquid simultaneously seeps out from the channels formed by multiple first through holes 241 and / or multiple second through holes 242, distributing evenly in the outer cup 22 and avoiding localized impact. During bubble impact, air simultaneously enters through multiple first through holes 241 and / or multiple second through holes 242, forming multi-point bubbling. The bubble cluster rises evenly from various positions on the bottom wall of the inner cup 21, achieving comprehensive and thorough agitation of the material layer. When the liquid rises, liquid uniformly enters the outer cup 22 through multiple first through holes 241 and / or multiple second through holes 242, ensuring uniform wetting of the material and preventing localized over-wetting or drying.

[0044] Please refer to some embodiments of this application. Figure 2 , Figure 3 and Figure 4 As shown, the refrigerator also includes a vacuum device 3, which is installed on the cabinet 101 or the door 102 for vacuuming the inner cup 21. The vacuum device 3 can be located on either the door 102 or the cabinet 101. For example, both the vacuum device 3 and the extraction device 2 can be located on the door 102 or both on the cabinet 101. Alternatively, the vacuum device 3 can be located on the door 102, and the extraction device 2 on the cabinet 101. In some specific embodiments of this application, the cabinet 101 or the door 102 has a receiving cavity 103, and the vacuum pump 31 is located within the receiving cavity 103. Optionally, such as... Figure 2 and Figure 3As shown, the receiving cavity 103 is located at the top of the door body 102. The suction pipe 33 is located within the foam layer of the door body 102. The connecting joint 32 is located on the inner side of the door body 102 and faces the shelf 104 supporting the extraction device 2. Alternatively, the receiving cavity 103 is located on the housing 101, and the suction pipe 33 is located within the foam layer of the housing 101. The connecting joint 32 is located on the side wall or top wall of the housing 101 and can be connected to the vacuum storage device 4 and the extraction device 2 housed in the storage chamber. Furthermore, one of the suction device 3 and the extraction device 2 can be located on the door body 102, and the other on the housing 101, as long as the connecting joint 32 can mate with the extraction device 2.

[0045] like Figure 3 and Figure 4 As shown, the vacuum device 3 includes a vacuum pump 31, a connecting joint 32, and a vacuum pipe 33. One end of the vacuum pipe 33 is connected to the vacuum pump 31, and the other end is connected to the connecting joint 32. The connecting joint 32 and the extraction device 2 are detachably connected. Specifically, a connecting portion 25 for vacuuming is formed on the cup lid 23, and the connecting portion 25 and the connecting joint 32 are detachably connected.

[0046] The vacuum pump 31 evacuates air from the inner cup 21 via the connecting joint 32. When the connecting joint 32 is connected to the extraction device 2, the vacuum pump 31 operates, causing the liquid in the extraction device 2 to soak the material and extract its flavor. Optionally, the vacuum pump 31 can be a vacuum pump. For example, the vacuum pump 31 can be a brushed motor vacuum pump, model CJVP28-AC12B41, with a voltage of 12V, a pump head diameter of 25mm-32mm, and an idle flow rate of 1.4-2L / min. Of course, the vacuum pump 31 can also be a brushless vacuum pump.

[0047] In some embodiments of this application, the refrigerator further includes a controller electrically connected to the vacuum pump 31. The controller is configured to receive a start command and control the vacuum pump 31 to run intermittently a preset number of times. From the start of operation of the vacuum pump 31, liquid in the outer cup 22 enters the inner cup 21 through a through-hole, and the liquid level in the outer cup 22 gradually decreases. When the liquid level in the outer cup 22 drops to be flush with the bottom wall of the inner cup 21, the vacuum pump 31 is controlled to continue operating, and gas enters the inner cup 21 through the through-hole to form bubbles. These bubbles pass through the liquid and material in the inner cup 21. When the vacuum pump 31 has operated for a first set time, the vacuum pump 31 is controlled to stop operating and remain operating for a second set time, allowing the liquid in the inner cup 21 to flow back to the outer cup 22. The preset number of times N satisfies 1 ≤ N ≤ 50, and N is an integer. It should be noted that the duration of each operation of the vacuum pump 31 can be different, that is, the first set time is different for different stages. The duration of each stop of operation of the vacuum pump 31 is different, that is, the second set time is different for different stages.

[0048] The startup command is input by the user. For example, the startup command can be input by pressing an operation key. Alternatively, the startup command can be input by voice.

[0049] The inner cup 21 is evacuated by the vacuum pump 31, creating a negative pressure, such as... Figure 10 and Figure 11 As shown, the liquid in the outer cup 22 enters the inner cup 21 and rises to soak the material. When the liquid level in the outer cup 22 is level with the first through hole 241, as... Figure 11 As shown, the vacuum pump 31 continues to operate, and air bubbles enter the inner cup 21, impacting the material and further releasing the active ingredients. Then, the vacuum pump 31 stops operating, and the air pressure inside the inner cup 21 returns to normal. Figure 12 As shown, the liquid in the inner cup 21 flows back into the outer cup 22 under the action of gravity. As the liquid level in the outer cup 22 drops, the first through hole 241 gradually emerges from the liquid surface. The liquid level in the outer cup 22 being flush with the first through hole 241 refers to the starting point where the first through hole 241 emerges from the liquid surface, that is, the liquid level is flush with the upper wall of the first through hole 241.

[0050] The intermittent operation of the vacuum pump 31 refers to the vacuum pump 31 working for a first set time, then stopping, then stopping for a second set time, and then starting again, repeating this cycle, alternating between the first set working time and the second set stopping time. After a preset number of intermittent operations, the vacuum pump 31 completely stops working and will not be restarted, completing the extraction operation. During intermittent operation, when the controller controls the vacuum pump 31 to work, the liquid in the outer cup 22 enters the inner cup 21, wetting the material and extracting the effective components from the material. This causes the liquid concentration flowing through the material to rise rapidly, while the liquid concentration away from the material remains low. During the intervals when the vacuum pump 31 stops working, the high-concentration liquid formed after soaking the material in the inner cup 21 flows back to the outer cup 22 by gravity to mix with the original liquid in the outer cup 22, breaking the concentration gradient inside the liquid and making the concentration in each area of ​​the extraction device 2 more even. Through a preset number of intermittent operations, the material components in the inner cup 21 are fully released. Secondly, by taking advantage of the interval when the vacuum pump 31 stops working, the material being soaked in the inner cup 21 when the vacuum pump 31 starts working again is a well-mixed, low-to-medium concentration liquid, rather than a continuously circulating high-concentration liquid. This avoids the decrease in extraction rate caused by local saturation, making the entire extraction process more thorough and uniform.

[0051] In this process, gas enters the inner cup 21 and forms bubbles. As these bubbles rise within the inner cup 21, they interact with the material particles through contact, compression, and sliding, creating strong mechanical disturbances in the material layer. This breaks up particle agglomeration that may have formed due to liquid immersion, causing the material particles to resuspend, rotate, and distribute, 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 wash away 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. Furthermore, the rising bubbles also generate turbulent disturbances, accelerating the renewal rate of the water flow around the material. When the bubbles complete their ascent and reach the liquid surface, they undergo a bursting process, releasing energy at the gas-liquid interface. This creates additional disturbance to materials floating or near the liquid surface, preventing them from remaining on the surface for too long and detaching from the extraction medium. It also facilitates the release of volatile aroma components (such as terpenes, furans, pyrazines, aldehydes, and ketones) from the liquid phase to the gas phase in coffee and other materials, enhancing aroma perception.

[0052] In addition, the upward path of the bubbles is not fixed but exhibits a random distribution. 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 breaks the fixed flow channels that may 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 continues to improve, effectively suppressing the polarization between local over-extraction and under-extraction. Thus, the generated bubbles can enhance the mass transfer process, allowing flavor substances inside the material to be released into the water more quickly and fully, increasing the concentration and flavor fullness of the extract.

[0053] The refrigerator provided in this embodiment automatically completes three steps—negative pressure water absorption and wetting of materials, gas entering the liquid to generate bubble impact, and depressurization gravity reflux—through the intermittent operation of the vacuum pump 31 and the exposure state of the connecting component between the bottom of the inner cup 21 and the outer cup 22 as the liquid level changes. During liquid wetting, the material's flavor is transferred and preliminary extraction is achieved, establishing a basic concentration field and substance distribution. Bubble disturbance breaks up any potential concentration boundary layer, reactivating the mass transfer process and allowing flavor substances inside the material to be released into the water more quickly and fully, increasing the concentration and flavor fullness of the extract. This sequence of wetting followed by disturbance allows each cycle to simultaneously achieve the dual benefits of static soaking and dynamic enhancement.

[0054] In some embodiments of this application, the refrigerator includes a container identification unit, which includes a first identification part and a second identification part. The first identification part is disposed on the shelf 104, and the second identification part is disposed on the extraction device 2. When the extraction device 2 is installed on the shelf 104, the first identification part detects the second identification part on the extraction device 2, determining that the extraction device 2 has been placed on the shelf 104. At this time, the controller receives a first signal and can then control the vacuum device 3 to operate. As one possible configuration, the first identification part can be a magnetic detection element, and the second identification part can be a magnetic component.

[0055] The above technical solution uses a first identification unit to monitor the presence status of the extraction device 2 in real time. The controller only allows the receiving of the first signal to execute the corresponding operation after confirming that the device has been placed. This presence verification mechanism fundamentally avoids erroneous operation in the event of a missing or improperly placed device, providing a reliable prerequisite for the safe start-up and operation of the extraction device 2.

[0056] The controller's program startup logic is tied to the magnetic detection signal; without a signal, it will not start. Even if the user accidentally sends a start command, as long as the first identification unit does not detect the second identification unit, the controller determines that the extraction device 2 is not installed correctly and refuses to execute the start command. This hardware-level interlocking mechanism is more reliable than purely software-based accidental touch prevention and effectively avoids the risk of misoperation due to the device not running.

[0057] In some embodiments of this application, such as Figure 9 As shown, the refrigerator also includes a vacuum storage device 4. Both the vacuum storage device 4 and the extraction device 2 can be detachably mounted on the cabinet 101 or on the door 102. The docking connector 32 is selectively connected to either the vacuum storage device 4 or the extraction device 2. The controller is configured to: when the docking connector 32 is connected to the vacuum storage device 4, control the vacuum pump 31 to run for a first preset time and then shut it off; and when the docking connector 32 is connected to the extraction device 2, control the vacuum pump 31 to run intermittently a preset number of times. The vacuum storage device 4 is a vacuum box or a vacuum bag.

[0058] The connecting joint 32 selectively connects to the vacuum storage device 4 and the extraction device 2, thereby allowing the vacuum storage device 4 and the extraction device 2 to share a single suction device 3. That is, a single suction device 3 can simultaneously accommodate the vacuum preservation function of the vacuum storage device 4 and the vacuum extraction function of the extraction device 2. Compared to having separate suction devices 3 for the vacuum storage device 4 and the extraction device 2, this reduces the number of components and lowers the overall material procurement cost, assembly and processing cost, and supply chain management cost of the refrigerator. Furthermore, the shared use of the universal suction device 3 eliminates the need to reserve separate installation space for each function, significantly reducing the volume occupied by non-storage function modules. This allows more space in the cabinet 101 to be allocated to the core refrigeration and freezing compartments of the refrigerator, increasing the effective storage capacity. Simultaneously, it simplifies the structural design of the cabinet 101 and the door 102, reducing the difficulty and cost of mold making and processing.

[0059] In some embodiments, the refrigerator includes a detection element, and the controller determines the type of container connected to the docking connector 32 based on information acquired by the detection element. For example, the detection element may be a camera, and the controller performs image recognition using image information acquired by the camera to determine the type of container connected to the docking connector 32. Alternatively, the detection element may be a pressure sensor, which is installed on the vacuum line 33. During the operation of the vacuum pump 31, the controller determines the type of container connected to the docking connector 32 based on the detection value of the pressure sensor. In still other embodiments, the controller identifies the type of container connected to the docking connector 32 based on user-inputted operating commands. This application does not specifically limit the embodiments in this regard.

[0060] The first preset duration is the time required for the vacuum pump 31 to reach the target pressure inside the vacuum storage device 4. Optionally, the first preset duration can be preset or determined online based on the detection of the pressure detection element. When the container type connected to the docking joint 32 is the vacuum storage device 4, the vacuum pump 31 runs continuously until the pressure inside the vacuum storage device 4 reaches the target pressure. When the container type connected to the docking joint 32 is the extraction device 2, the vacuum pump 31 runs intermittently to perform multiple repeated extractions to fully extract the flavor of the raw materials.

[0061] In some embodiments of this application, the air extraction device 3 includes a pressure relief valve 34, which is installed on the air extraction pipeline 33. Specifically, the pressure relief valve 34 is located inside the receiving cavity 103, and the connection or disconnection between the air extraction pipeline 33 and the inside of the receiving cavity 103 can be controlled by the pressure relief valve 34. Figure 4 As shown, the air extraction line 33 has branches, and the pressure relief valve 34 is located at the end of the branch.

[0062] The controller is configured to: when the docking joint 32 is connected to the vacuum storage device 4, control the pressure relief valve 34 to open when the pump 31 is shut down, and control the pressure relief valve 34 to close after a first pressure relief period. When the docking joint 32 is connected to the extraction device 2, control the pressure relief valve 34 to be open when the pump 31 stops operating during intermittent operation, and control the pressure relief valve 34 to be closed during and after the intermittent operation of the pump 31.

[0063] When the connecting joint 32 is connected to the vacuum storage device 4, if the pump 31 is stopped directly while it is running, a pressure difference will exist between its exhaust port and the atmosphere, which may cause internal pump oil to backflow into the pump chamber or pipeline. Therefore, in this embodiment, when the pump 31 stops working, the pressure relief valve 34 is opened for a certain period of time to allow the pump 31 to smoothly transition to atmospheric pressure and prevent pump oil backflow. Optionally, the first pressure relief duration is 3s to 5s. For example, the first pressure relief duration is any value between 3s and 5s, such as 3s, 5s, or 4s.

[0064] When the coupling 32 is connected to the extraction device 2, if the design lacks a pressure relief valve 34 or the pressure relief valve 34 has a delayed opening, the suction line 33 and the inner cup 21 remain under negative pressure when the pump 31 stops working. This residual negative pressure will hold back the liquid in the inner cup 21, and the liquid needs to overcome the negative pressure before it can start flowing, preventing the liquid from immediately flowing back downwards, resulting in a time window for the reflux start-up. In some embodiments of this application, when the pump 31 stops working during intermittent operation in the extraction process, the pressure relief valve 34 opens, allowing outside air to quickly enter the extraction device 2 through the suction line 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 improving the reflux speed.

[0065] Furthermore, during multiple extraction cycles, the liquid level difference between the inner cup 21 and the outer cup 22, as well as the magnitude of the residual negative pressure, will affect the start time and flow rate of reflux at the moment the vacuum pump 31 stops. If reflux starts too quickly, the high-concentration liquid may be drawn back to the outer cup 22 before it is completely separated from the material. Also, after the vacuum pump 31 stops, a small amount of extract droplets may remain on the inner wall of the vacuum pipe 33. Without a pressure relief valve 34, when the vacuum pump 31 is restarted, these residual liquids may be directly drawn into the vacuum pump 31, and long-term accumulation can lead to bacterial growth, odor, and even damage to the vacuum pump 31. At the same time, the dirt formed by the dried extract droplets in the vacuum pipe 33 will also affect the purity of subsequent extractions. When the pressure relief valve 34 is opened, outside air enters the vacuum pipe 33, creating an airflow purging effect—the flowing air can blow the residual liquid adhering to the inner wall of the vacuum pipe 33 back to the extraction device 2 or discharge it, reducing the residence time of the residual liquid in the vacuum pipe 33. After each soaking, opening the pressure relief valve 34 can keep the suction line 33 relatively dry and clean, prevent residual liquid from contaminating the suction machine 31, extend the life of the components, and ensure the hygiene and safety of the next extraction.

[0066] The extraction device 3 includes a purification module installed inside the receiving cavity 103. A controller is electrically connected to the purification module to control the purification module to purify the gas inside the receiving cavity 103. The extraction pump 31 discharges the gas extracted from the extraction device 2 or the vacuum storage device 4 into the receiving cavity 103 for purification by the purification module.

[0067] In some embodiments, the purification module can be installed on the air extraction pipeline 33. Air entering from the pressure relief valve 34 passes through the purification module and then enters the extraction device 2 or the vacuum storage device 4. Gas extracted by the pump 31 is purified by the purification module and then discharged into the receiving cavity 103. In other embodiments, the purification module is installed independently of the air extraction device 3 and directly in the receiving cavity 103 to purify the air in the receiving cavity 103.

[0068] In the above technical solution, the exhaust port of the vacuum pump 31 is located inside the receiving cavity 103. The gas extracted by the vacuum pump 31 is directly discharged into the cavity defined by the receiving cavity 103, and will not directly diffuse to other areas of the refrigerator. At the same time, the purification module continuously treats the gas in the receiving cavity 103, adsorbing or decomposing odor molecules, making the gas fresh in the receiving cavity 103. By placing both the purification module and the vacuum pump 31 inside the receiving cavity 103, the pollution of the internal environment of the storage compartment by odor extraction is fundamentally eliminated.

[0069] In addition, the pressure relief valve 34 controls the connection between the suction line 33 and the receiving cavity 103. When the pressure relief valve 34 is open, the gas entering the suction line 33 comes from inside the receiving cavity 103. The gas inside the receiving cavity 103 is the clean air that was previously discharged by the suction fan 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 pollutants. Even with multiple cycles, the liquid in the inner cup 21 is always in contact with clean air, avoiding secondary pollution and ensuring the purity of the flavor of the extract, unaffected by the external environment.

[0070] In some embodiments of this application, the controller is configured to: control the purification module to operate when the vacuum pump 31 is working, provided that the coupling connector 32 is connected to the extraction device 2; and continue operating when the vacuum pump 31 stops working. When the intermittent operation of the vacuum pump 31 ends, the controller controls the purification module to continue operating for a first purification time before shutting down. The first purification time is 0 seconds or a non-zero value such as 10 seconds or 20 seconds. That is, when the intermittent operation of the vacuum pump 31 ends, the purification module can either shut down immediately or continue operating for a certain period before shutting down.

[0071] It should be noted that when the docking joint 32 is connected to the vacuum storage device 4, the purification module operates while the vacuum pump 31 is working, and continues to operate for a second purification time after the vacuum pump 31 stops working, before shutting down. The second purification time is a non-zero value such as 0s, 10s, or 20s. That is, when the vacuum pump 31 finishes vacuuming, the purification module can be shut down immediately, or it can continue to run for a certain period of time before shutting down.

[0072] The refrigerator provided in this embodiment of the above technical solution has a purification module that operates continuously throughout the extraction process, continuously removing residual odor molecules from the gas stored in the containment cavity 103. During the extraction process, the pressure relief valve 34 is closed when the vacuum pump 31 is working; the pressure relief valve 34 is open when the vacuum pump 31 stops working, which may introduce new gas into the containment cavity 103. The new gas comes from the air inside the refrigerator (which may contain the odors of other food ingredients), or from the outside air introduced through a dedicated air inlet (which may contain dust and bacteria), or from unfiltered air that seeps in through tiny gaps. In the refrigerator provided in this embodiment of the application, the newly added gas entering the containment cavity 103 is purified by the purification module as soon as it enters the containment cavity 103. Thus, throughout the entire pressure relief process, the gas is processed in real time by the purification module before entering the inner cup 21, ensuring that particulate matter in the outside air is filtered and intercepted, odor molecules are adsorbed or decomposed, and bacteria and other microorganisms are inactivated, cutting off the pollution path of the outside air to the inner cup 21 from the source. The above technical solution, with its dynamic purification mechanism, ensures that the air entering the inner cup 21 is clean at every moment during the depressurization process, avoiding the decrease in cleanliness caused by gas replenishment. The cleanliness remains stable throughout the depressurization process, and the gas quality in the upper space of the inner cup 21 remains stable throughout the reflux process, providing a continuously clean environment for the extract.

[0073] Furthermore, during the extraction and depressurization phase, the gas within the containment chamber 103 flows from its internal space to the inlet of the depressurization valve 34, exhibiting a slow, directional flow. This flow ensures the gas continuously passes through the working area of ​​the purification module, increasing the probability and frequency of contact between gas molecules and the purification medium. Compared to the high-speed airflow of the extraction phase and the static state of the pause phase, the low-speed flow in the depressurization phase guarantees sufficient contact time and avoids localized concentration unevenness caused by gas stagnation, making the purification module's efficiency even higher in the depressurization phase than in other phases. Moreover, each gas flow during the depressurization phase is equivalent to a gas scavenging of the interior of the containment chamber 103. The flowing gas carries away trace contaminants adhering to the inner wall, allowing them to be captured and processed by the purification module. Simultaneously, the newly introduced gas flushes the space of the containment chamber 103, preventing the accumulation of localized contaminants. After multiple cycles, the interior of the containment chamber 103 remains relatively clean, avoiding long-term odor problems caused by contaminant accumulation.

[0074] In some embodiments of this application, the controller is configured to: control the purification module to operate when the vacuum pump 31 is working, with the docking joint 32 connected to the extraction device 2; control the purification module to stop operating when the vacuum pump 31 stops operating; and control the purification module to continue operating for a first purification period and then shut down after the intermittent operation of the vacuum pump 31 ends. In this scheme, the purification module and the vacuum pump 31 are started and stopped synchronously. As soon as the odor molecules extracted by the vacuum pump enter the containment section, they are immediately captured and processed by the purification module. This "extraction and purification" mode keeps the gas in the containment section at a low odor concentration, avoiding the short-term accumulation of odor molecules and the risk of subsequent diffusion. At the same time, the synchronous stop design ensures that the purification module no longer operates after the vacuuming is completed, saving energy. When the vacuum pump 31 stops operating intermittently, the pressure relief valve 34 is in the open state. At this time, the air in the containment section has undergone continuous purification treatment throughout the entire vacuuming stage, and its cleanliness has reached the highest level currently. When this portion of the highest cleanliness air enters the inner cup 21, it creates a clean air exchange in the upper space of the inner cup 21, diluting or replacing the original odor-laden air and keeping the space in the inner cup 21 fresh. This design ensures that the air the liquid comes into contact with is fully purified in each cycle, maximizing the preservation of the pure flavor of the extract.

[0075] In some embodiments of this application, the suction device 3 further includes a pressure sensor disposed on the suction line 33 for detecting the pressure within the suction line 33. A controller is electrically connected to the pressure sensor. The controller is configured to determine, based on the pressure sensor's detection value, whether the device connected to the docking connector 32 is the extraction device 2 or the vacuum storage device 4.

[0076] Specifically, based on the received start command, the pump 31 is controlled to operate and the air pressure in the pumping pipe 33 monitored by the pressure sensor is acquired. If the air pressure in the pumping pipe reaches the first set pressure within the first operating time, the container connected to the docking connector 32 is identified as the vacuum storage device 4. If the air pressure in the pumping pipe 33 does not reach the first set pressure within the first operating time, the container connected to the docking connector 32 is identified as the extraction device 2.

[0077] In some embodiments of this application, such as Figure 4 As shown, the vacuum pump 3 also includes a pressure switch 35. The vacuum line 33 has branches, and the pressure switch 35 is mounted on the branches and parallel to the vacuum pump 31. The controller is electrically connected to the pressure switch 35 and is configured to determine whether the device connected to the docking joint 32 is the extraction device 2 or the vacuum storage device 4 based on the output signal of the pressure switch 35.

[0078] The pressure relief valve 34 is located at the end of the branch. The output signal of the pressure switch 35 can provide feedback on the pressure change in the evacuation pipeline 33. Optionally, the pressure switch 35 is model W63-F002, with an open / reset pressure of 0.78±0.02 atm. In a non-vacuum state, when the absolute pressure value in the evacuation pipeline 33 is higher than the set value, the pressure switch 35 is turned on, and the output signal is low; in a vacuum state, when the absolute pressure value in the evacuation pipeline 33 is lower than the set value, the pressure switch 35 is turned off, and the output signal is high. Therefore, when the vacuum storage device 4 is connected to the docking joint 32, the pump 31 evacuates the vacuum storage device 4, and the pressure in the evacuation pipeline 33 matches the pressure in the vacuum storage device 4, gradually decreasing, thus causing the pressure switch 35 to switch from the on state to the off state, and the output signal to switch from low level to high level, changing accordingly. When the extraction device 2 is connected to the docking joint 32, the vacuum pump 31 operates, the air pressure in the vacuum pipeline 33 fluctuates slightly, the pressure switch 35 is always in the ON state, and the output signal of the pressure switch 35 is always high. In addition, the pressure switch 35 can also output a high-level signal when it is in the ON state and a low-level signal when it is in the OFF state.

[0079] Based on the received start command, the controller controls the vacuum pump 31 to operate and acquires the output signal of the pressure switch 35. If the output signal of the pressure switch 35 changes and maintains the changed signal state for a set stable time, the container connected to the docking joint 32 is determined to be the vacuum storage device 4, and the vacuum pump 31 continues to run for a preset time before stopping. If the output signal of the pressure switch 35 does not change within the second operating time, the container connected to the docking joint 32 is determined to be the extraction device 2. Here, T0 is the time required for the vacuum pump 31 to evacuate the vacuum storage device 4, causing the output signal of the pressure switch 35 to change. The second operating time is greater than T0. The set stable time is 2s to 4s. Optionally, the set stable time can be any value between 2s, 4s, or 3s. By maintaining the set stable time, misjudgments caused by pressure fluctuations leading to pressure switch 35 jitter are avoided.

[0080] For example, if the vacuum storage device 4 is a vacuum box, the pressure switch 35's output signal will change after the vacuum box is evacuated by the pump 31 for 15 seconds, i.e., T0 = 15 seconds. Therefore, the second working time can be set to 20 seconds or 16 seconds, as long as it is greater than 15 seconds. Similarly, if the vacuum storage device 4 is a vacuum bag, the pressure switch 35's output signal will change after the vacuum bag of different sizes is evacuated by the pump 31 for no more than 30 seconds, i.e., T0 < 30 seconds. Therefore, the second working time can be set to 30 seconds. When the vacuum storage device 4 includes both vacuum bags and vacuum boxes, the second working time can be set to 30 seconds to ensure that if the container connected to the docking connector 32 is a vacuum bag or a vacuum box, it can be identified within the second working time without affecting the accuracy of the judgment result.

[0081] like Figure 10 As shown, the outer cup 22 has a first reference surface L1, which is the highest liquid level that the outer cup 22 can hold. The inner cup 21 is divided into a first content section 211 and a second content section 212 by the first reference surface L1. The first content section 211 is located above the first reference surface L1, and the second content section 212 is located below the first reference surface L1.

[0082] When the vacuum pump 31 is operating, the air pressure in the inner cup 21 decreases, and liquid flows from the outer cup 22 into the inner cup 21. On 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 vacuuming. On the other hand, 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 vacuuming process, ensuring sufficient liquid immersion of the material and improving overall extraction uniformity. Furthermore, during extraction, the rate of solute diffusion from the material to the liquid is related to the concentration gradient and the contact area. The first internal section 211 in the inner cup 21 allows for a larger volume of liquid entering from the outer cup 22, resulting in a larger liquid volume per unit mass of material, a slower increase in solute concentration in the liquid, and a greater mass transfer driving force. This also ensures more thorough contact between the material and the liquid, reducing local saturation and improving extraction efficiency.

[0083] The refrigerator provided in this embodiment of the application has a first internal section 211 that extends the volume of the inner cup 21 upwards. During evacuation, the liquid can rise to a position higher than the first reference surface L1, thus wetting all or most of the material contained in the inner cup 21. This avoids the problem of insufficient extraction of the upper material due to insufficient space in the traditional extraction device 2, and makes the extraction degree of each part of the material more uniform.

[0084] In some embodiments of this application, such as Figure 11 and Figure 12As shown, the plane containing the bottom of the inner cup 21 is denoted as the second reference plane L2. The area of ​​the outer cup 22 outside the inner cup 21 is divided by the second reference plane L2 into a first outer container 221 and a second outer container 222. The first outer container 221 is located above the second reference plane L2, and the second outer container 222 is located below the second reference plane L2. The first outer container 221 surrounds the second inner container 212.

[0085] In the above technical solution, the second outer container 222 is located below the bottom wall of the inner cup 21. When the suction device 3 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 pressure difference. Since the liquid in the second outer container 222 is at the lowest position and closest to the first through hole 241 and / or the second through hole 242, this portion of 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 start 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 entering the inner cup 21, forming a natural liquid supply sequence.

[0086] 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 first through hole 241 and the second through hole 242, 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.

[0087] Please refer to Figure 12 As shown, after the vacuum pump 31 stops working, the air pressure in the inner cup 21 increases, the liquid level in the inner cup 21 decreases, and the liquid in the inner cup 21 enters the outer cup 22 through the first through hole 241 and / or the second through hole 242, causing the liquid level in the outer cup 22 to rise. When multiple-cycle extraction is used, after the vacuum pump 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 pump 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 mechanism allows each cycle to proceed at a high extraction rate, and the overall extraction efficiency is significantly higher than that of single-cycle extraction or rapid concentration saturation cycling methods.

[0088] In some embodiments of this application, the volume of liquid contained in the first outer container 221 is denoted as Vy, and the volume of the second inner container 212 is denoted as Vn, where Vy > kVn. Here, k is a ratio coefficient between the volume of water required for the material to become saturated and the volume of the material. The material is located in the second inner container 212, and kVn represents the amount of water required for the material to fully absorb water when the second inner container 212 is filled.

[0089] If Vy ≤ kVn, the material cannot be fully saturated with water, and some soluble substances inside the material cannot be released, resulting in insufficient extraction and low material utilization. In this application, Vy > kVn, the amount of liquid in the first outer volume 221 is sufficient to meet the material's water saturation requirement, allowing the material in the second inner volume 212 to fully absorb water, completely swell and wet, and allowing the soluble substances inside the material to be fully released into the liquid. This avoids the residue of soluble substances inside the material due to insufficient water absorption, which would lead to insufficient extraction and waste.

[0090] 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.

[0091] In some embodiments of this application, 0.5 ≤ k ≤ 1. The value of k varies for different materials. Specifically, some highly absorbent materials such as tea leaves or flower tea may require a water volume close to Vn, i.e., k is close to 1; while low-absorbent materials such as coarsely ground coffee may require a smaller water volume, k is close to 0.5.

[0092] Vy > kVn ensures that even after material saturation, there is still a residual liquid of Vy - kVn available for extraction. This residual liquid acts as an effective extraction medium, carrying soluble substances to form an extract. The concentration of the extract is moderate, avoiding excessive concentration due to insufficient liquid, which would affect the mass transfer driving force. If Vy is only slightly greater than kVn, the amount of residual liquid is small, the extract concentration is high, and the mass transfer driving force is low; if Vy is significantly greater than kVn, the amount of residual liquid is large, the extract concentration is low, the mass transfer driving force is large, and the extraction efficiency is higher. Therefore, in some embodiments of this application, Vy > m * kVn, where m ≥ 1.5.

[0093] When Vy > m*kVn, since m ≥ 1.5, the total liquid volume in the inner cup 21 will increase significantly, resulting in a higher liquid-to-solid ratio, a larger liquid volume, a slower increase in solute concentration, a longer concentration gradient between the material and the liquid, a sustained high mass transfer driving force, and the liquid being less likely to reach saturation. Extraction can then continue for a longer period without degradation. Furthermore, with increased liquid volume, the rising path of bubbles in the liquid is longer 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 bubbles rise in a large volume of liquid, enhancing their ability to adsorb and carry flavor compounds.

[0094] In some embodiments of this application, the actual liquid level inside the outer cup 22 is denoted as the third reference surface L3; the second reference surface L2 is located below the third reference surface L3. The inner cup 21 is divided into a first receiving portion and a second receiving portion by the third reference surface L3. The first receiving portion is located above the third reference surface L3, and the second receiving portion is located below the third reference surface L3. The volume of the first receiving portion is denoted as VS, satisfying: Vy < VS.

[0095] It should be noted that after the inner cup 21 is placed in the outer cup 22, the inner cup 21 and the outer cup 22 form a connected structure, and the liquid levels in the inner cup 21 and the outer cup 22 are the same. The liquid entering the inner cup 21 from the outer cup 22 submerges the material contained in the inner cup 21, and the second receiving part of the inner cup 21 contains both material and liquid.

[0096] The above technical solution, where Vy < VS, ensures, through volume matching, that the liquid in the outer cup 22 is completely contained within the inner cup 21 after entering, preventing the liquid level from reaching the top of the inner cup 21. This prevents liquid overflow and contamination of the refrigerator environment, and also prevents liquid from entering the vacuum device 3 and causing equipment damage. Secondly, Vy < VS ensures that all liquid in the area surrounding the outer cup 22 can enter the inner cup 21, thus guaranteeing that the liquid level in the outer cup 22 will drop below the bottom of the inner cup 21, providing certainty for triggering the bubble extraction stage. Please refer to... Figure 10 As shown, before the liquid level in the outer cup 22 drops below the bottom of the inner cup 21, the liquid wets the material, ensuring it is fully moistened; as... Figure 11 As shown, after the liquid level in the outer cup 22 drops below the bottom of the inner cup 21, the first through hole 241 and / or the second through hole 242 are exposed, and the drawn-in air forms a continuous upward flow of bubbles, which performs bubble extraction and enhances mass transfer through the mechanical action of the bubbles and interface renewal.

[0097] In some embodiments of this application, the lowest liquid level in the outer cup 22 exceeds the second reference surface L2. At this time, the second outer container 222 is completely filled with liquid, which is located directly below the bottom wall of the inner cup 21, with zero or minimal distance from the first through hole 241 and / or the second through hole 242. When the vacuum pump 31 is started, negative pressure immediately acts on this portion of liquid, allowing it to be instantly forced into the inner cup 21 without any delay. 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, liquid from the first outer container 221 can be continuously replenished into the second outer container 222 area and then forced into the inner cup 21, forming a continuous liquid supply. This initial state, where the second outer container 222 is full of liquid while the first outer container 221 is also liquid, ensures that there will be no interruption in the liquid supply during the initial stage of gas extraction. 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 12 As shown, after the pumping stops, the liquid in the inner cup 21 flows back to the outer cup 22, mixing 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 mixes with the reflux liquid. Because the second outer container 222 has a relatively small volume, 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, such as Figure 6 As shown, the extraction device 2 also includes a filter 27, which is fitted inside the inner cup 21, forming a material storage bin between the bottom of the filter 27 and the inner wall of the inner cup 21.

[0100] In the liquid extraction stage, the liquid enters from the bottom of the inner cup 21 and flows upward after passing through the material layer. At this time, the filter 27 is located above the material and can effectively intercept fine particles carried by the liquid, preventing them from entering the first inner chamber 211 of the inner cup 21 and the vacuum pump 31, thus protecting the vacuum device 3 from particle contamination and ensuring the cleanliness of the upper space of the inner cup 21. In the bubble extraction stage, when bubbles pass through the mesh structure of the filter 27, large bubbles are broken into multiple 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. The filter 27 provides some resistance to the rise of bubbles, slowing down the speed at which bubbles pass through the material layer, allowing for more sufficient contact time between the bubbles, liquid, and material. The filter 27 makes the bubbles more evenly distributed across the cross-section, preventing bubbles from concentrating in one area and making the extraction of all parts of the material more uniform.

[0101] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A refrigerator, characterized in that, include: The container has a storage compartment; A door, connected to the box body, is used to open or close the storage room; An extraction device is detachably installed on the housing or the door. The extraction device includes an inner cup and an outer cup. The outer cup is connected to the external environment and is used to hold liquid. The inner cup is at least partially located inside the outer cup and is used to hold material. The side wall of the inner cup has a first through hole that communicates with the interior of the outer cup. An air extraction device is installed on the housing or the door. The air extraction device includes a docking joint, an air extraction machine, and an air extraction pipeline. One end of the air extraction pipeline is connected to the air extraction machine, and the other end is connected to the docking joint. The docking joint is used to connect to the extraction device so that the air extraction machine can extract air from the inner cup. A controller, electrically connected to the vacuum pump, is configured to: receive a start command and control the vacuum pump to operate; the liquid in the outer cup enters the inner cup through the first through hole, and the liquid level in the outer cup gradually decreases; when the liquid level in the outer cup decreases to be level with the first through hole, the controller controls the vacuum pump to continue operating, so that gas enters the inner cup through the first through hole to form bubbles, and the bubbles pass through the liquid and material in the inner cup.

2. The refrigerator as described in claim 1, characterized in that, The bottom wall of the inner cup has a second through hole communicating with the interior of the outer cup. The diameter of the second through hole is r, and the diameter of the bottom wall of the inner cup is R, where r < R / 5.

3. The refrigerator as described in claim 2, characterized in that, The extraction device further includes a filter, which is fitted inside the inner cup. The lower part of the filter forms a material hopper with the inner wall of the inner cup. A filter screen is installed in the first through hole and / or the second through hole, and the mesh size of the filter screen is not less than 200 mesh.

4. The refrigerator as described in claim 2, characterized in that, The center of the bottom wall of the inner cup is located on the shaft of the second through hole.

5. The refrigerator as described in claim 1, characterized in that, The refrigerator also includes a vacuum storage device, both of which are detachably mounted on the cabinet or on the door. The docking connector is selectively connected to either the vacuum storage device or the extraction device. The controller is configured to, when the docking connector is connected to the vacuum storage device, control the vacuum pump to run for a first preset time and then shut it off; and when the docking connector is connected to the extraction device, control the vacuum pump to run intermittently a preset number of times.

6. The refrigerator as described in claim 5, characterized in that, The air extraction device also includes a pressure relief valve, which is installed on the air extraction pipeline. The controller is also configured to: when the docking joint is connected to the vacuum storage device, when the air extraction machine is turned off, control the pressure relief valve to open for a first pressure relief time and then close. And / or, when the docking joint is connected to the extraction device, the pressure relief valve is controlled to be open when the pump stops working during intermittent operation, and the pressure relief valve is controlled to be closed when the pump is working during intermittent operation and after operation.

7. The refrigerator as described in claim 6, characterized in that, The door body is provided with a receiving cavity, and the air pump and the pressure relief valve are located in the receiving cavity. The air pump discharges the gas it extracts into the receiving cavity; the pressure relief valve is used to control the connection and disconnection between the air extraction pipeline and the inside of the receiving cavity. The air extraction device also includes a purification module, which is installed inside the receiving cavity to purify the gas inside the receiving cavity.

8. The refrigerator as described in any one of claims 5 to 7, characterized in that, The suction device also includes a pressure sensor, which is installed on the suction pipeline to detect the pressure in the suction pipeline. The controller is electrically connected to the pressure sensor. The controller is configured to determine whether the device connected to the docking joint is the extraction device or the vacuum storage device based on the detection value of the pressure sensor. Alternatively, the pumping device may further include a pressure switch, the pumping line having a branch, the pressure switch being disposed on the branch and parallel to the pump; the controller being electrically connected to the pressure switch, the controller being configured to determine, based on the output signal of the pressure switch, whether the device connected to the docking joint is the extraction device or the vacuum storage device.

9. The refrigerator as described in any one of claims 1 to 4, characterized in that, The outer cup has a first reference surface L1, which is the highest liquid level that the outer cup can hold. The inner cup is divided into a first content section and a second content section by the first reference surface L1. The first content section is located above the first reference surface L1, and the second content section is located below the first reference surface L1 and is used to hold materials.

10. The refrigerator as described in claim 9, characterized in that, The plane containing the bottom of the inner cup is denoted as the second reference plane L2. 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 plane L2. The first outer container is located above the second reference plane L2, and the second outer container is located below the second reference plane L2. The volume of the liquid contained in the first outer container is denoted as Vy. The volume of the second inner container is denoted as Vn. Wherein, Vy > kVn, and k is the ratio coefficient between the volume of water required for the material to become saturated and the volume of the material.

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