Fresh-keeping method for refrigerator

Abstract

This invention discloses a preservation method for refrigerators, relating to the field of refrigerators. The refrigerator has at least two independent preservation compartments. The preservation device includes: at least two oxygen-enriching components, each including an oxygen-enriching membrane and a collection chamber; and an air extraction device. At least one oxygen-enriching component is an adjustable oxygen-enriching component, wherein there are at least two oxygen-enriching membranes, each corresponding to a collection chamber. The adjustable oxygen-enriching component further includes: branches and an adjustment mechanism. There are at least two branches, each corresponding to at least two collection chambers. One end of each branch is connected to a collection chamber, and the other end is connected to an air extraction pipe. The adjustment mechanism controls the opening and closing of the branches and controls the number of branches that are opened and closed. A controller controls each adjustment mechanism to alternately enter an oxygen reduction mode and a stable mode. The preservation device of this invention has an adjustable oxygen reduction capacity for the preservation compartments, adapting to the oxygen concentration requirements of different types of food. This preservation method is simple and has low energy consumption.

Description

Technical Field

[0001] This invention relates to the field of refrigerators, and in particular to a method for preserving food in a refrigerator. Background Technology

[0002] Low oxygen levels are a good way to preserve food. The benefits of low oxygen for fruits and vegetables lie in its ability to effectively inhibit respiration, reduce the consumption of organic matter, and thus extend their shelf life. Therefore, increasingly more technologies for oxygen-controlled preservation, such as MSA (modified atmosphere packaging), are appearing on the market.

[0003] In existing technologies, multi-compartment preservation solutions typically involve a large number of components and are costly. Therefore, controlling costs and implementing multi-compartment preservation solutions with simpler structures is one of the research directions that needs to be addressed in current technologies. Furthermore, different types of food require different oxygen concentrations; therefore, designing differentiated oxygen concentrations is also a research direction. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a preservation method for refrigerators, which can achieve preservation solutions for each compartment in a simple manner.

[0005] According to an embodiment of the present invention, a method for preserving food in a refrigerator includes a refrigerator having at least two independent preservation compartments. The preservation device includes at least two oxygen-enriching components, each of which is correspondingly connected to one of the preservation compartments. Each oxygen-enriching component includes an oxygen-enriching membrane and a collection chamber. The oxygen-enriching component allows oxygen in the preservation compartment to permeate through the oxygen-enriching membrane and enter the collection chamber in greater quantities than nitrogen. An air extraction device is also included. At least one of the oxygen-enriching components is an adjustable oxygen-enriching component. The adjustable oxygen-enriching component has at least two oxygen-enriching membranes, each corresponding to one of the collection chambers. The adjustable oxygen-enriching component further includes: a branch channel and an adjustment mechanism. The branch channel has at least two branches, each corresponding to one of the at least two collection chambers. One end of each branch channel is connected to the collection chamber, and the other end is connected to the air extraction device. The adjustment mechanism controls the opening and closing of the branch channels and controls the number of branches that are opened or closed.

[0006] The preservation device also includes a controller, which is electrically connected to the air extraction device and all the adjustment components. After receiving a notification that the preservation device is turned on, the controller controls the air extraction device to operate and controls each adjustment component to alternately enter an oxygen reduction mode and a stable mode. In the oxygen reduction mode, the number of branch channels opened by the adjustment component is greater than the number of branch channels opened by the adjustment component in the stable mode.

[0007] In the refrigerator preservation method of this invention, at least two oxygen-enriching components are connected to a single air extraction device, enabling efficient oxygen reduction in at least two preservation compartments using a single air extraction device. This reduces the number of air extraction devices and lowers costs.

[0008] By setting at least one oxygen-enriching component as an adjustable oxygen-enriching component, the oxygen reduction capacity of the corresponding fresh-keeping compartment can be adjusted, and at least two fresh-keeping compartments can have different oxygen reduction capacities to adapt to the oxygen concentration requirements of different types of food.

[0009] The controller controls the adjustment mechanism to alternate between deoxygenation mode and stable mode, so that the freshness compartment can perform a rapid deoxygenation and then stop or slow deoxygenation. This can save power consumption, help maintain system pressure balance, and reduce load.

[0010] In some embodiments, the preservation device further includes: a first detection element, the first detection element being used to detect the on / off state of the preservation chamber connected to the adjustable oxygen-enriching component, and the controller being electrically connected to the first detection element; when the first detection element detects that the preservation chamber is open and then detects that the preservation chamber is closed, the controller controls the corresponding adjustment element to re-enter the oxygen-reducing mode, and then alternately enters the stable mode and the oxygen-reducing mode.

[0011] Specifically, the oxygen reduction mode includes: a first oxygen reduction mode, in which the adjustment device enters the first oxygen reduction mode after the preservation device is turned on; and a second oxygen reduction mode, in which the adjustment device enters the second oxygen reduction mode after the preservation compartment is first opened and then closed.

[0012] Wherein, the duration of the second oxygen reduction mode is shorter than the duration of the first oxygen reduction mode, and / or, the number of branch channels opened by the gear shifting component in the second oxygen reduction mode is less than the number of branch channels opened by the gear shifting component in the first oxygen reduction mode.

[0013] Specifically, the oxygen reduction mode further includes: a third oxygen reduction mode, and the remaining oxygen reduction modes are the third oxygen reduction mode; the duration of the third oxygen reduction mode is shorter than the duration of the first oxygen reduction mode and the second oxygen reduction mode, and / or, in the third oxygen reduction mode, the number of branches opened by the gear shifting component is less than the number of branches opened by the gear shifting component in the first oxygen reduction mode and the second oxygen reduction mode.

[0014] In some embodiments, when the oxygen reduction mode meets the preset oxygen reduction duration, the adjustment component is controlled to switch to the stable mode; when the stable mode meets the preset stable duration, the adjustment component is controlled to switch to the oxygen reduction mode.

[0015] In some embodiments, the preservation device further includes: a second detection element, the second detection element being used to detect the oxygen concentration in the preservation chamber connected to the adjustable oxygen enrichment component, and the controller being electrically connected to the second detection element;

[0016] In the oxygen reduction mode, when the second detection element detects that the oxygen concentration has reached the first set range, the control element switches to the stable mode.

[0017] In the stable mode, when the second detection element detects that the oxygen concentration has reached the second set range, it controls the adjustment element to switch to the oxygen reduction mode.

[0018] In some embodiments, at least two of the oxygen-enriching components are adjustable oxygen-enriching components, and the level of one of the fresh-keeping compartments is higher than the level of the other fresh-keeping compartment.

[0019] The controller is used to control: the duration of the high-level preservation compartment in the deoxygenation mode is greater than the duration of the low-level preservation compartment in the deoxygenation mode; and / or, the number of branches opened in the high-level preservation compartment in the deoxygenation mode is greater than the number of branches opened in the low-level preservation compartment in the deoxygenation mode.

[0020] Specifically, the controller is used to control: the duration of the high-level preservation compartment in the stable mode is less than the duration of the low-level preservation compartment in the stable mode; and / or, the number of aisles opened in the high-level preservation compartment in the stable mode is greater than the number of aisles opened in the low-level preservation compartment in the stable mode.

[0021] Furthermore, the preservation device also includes an input component, which is electrically connected to the controller and is used to input the setting of the preservation compartment.

[0022] Furthermore, after the preservation device is turned on, the controller controls the air extraction device to operate continuously; or, after the preservation device is turned on, the controller controls the air extraction device to operate when at least one of the branch channels is opened.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a refrigerator according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram illustrating the assembly relationship between the preservation device and the preservation chamber in some embodiments;

[0027] Figure 3 This is an assembly diagram showing the relationship between the single tube and the adjusting component on the end face in some other embodiments;

[0028] Figure 4 This is a schematic diagram of the control relationship of a preservation device in some embodiments.

[0029] Figure label:

[0030] Refrigerator 1000

[0031] 100 preservation devices

[0032] Oxygen-enriched component 1

[0033] 11. Oxygen-enriched membrane; 12. Collection chamber; 13. Branch channel; 14. Adjustment component; 141. Sub-switch; 142. Closing plate; 15. Buffer chamber; 16. Partition; 17. Sealing strip; 18. Flexible hose; 19. Single pipe.

[0034] 3. Air extraction device; 31. Air pump

[0035] 41. Evacuation tube

[0036] Intake pipe 42,

[0037] Fan 7

[0038] First detection component 91, second detection component 92, controller 95, input component 96

[0039] Container size 200, fresh food compartment size 210. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] A method for preserving food in a refrigerator according to an embodiment of the present invention will now be described with reference to the accompanying drawings. To understand this preservation method, please refer to... Figures 1-3 The structure of a preservation device 100 that can use this preservation method is described.

[0044] like Figure 1 As shown, the refrigerator 1000 has at least two independent fresh-keeping compartments 210. The location of the fresh-keeping compartments 210 is not limited; they can be located within the same compartment of the refrigerator 1000, for example, both can be located in the refrigerator compartment, the middle compartment, or other compartments (such as the freezer compartment). Alternatively, the at least two fresh-keeping compartments 210 can be located in different compartments of the refrigerator 1000; for example, some fresh-keeping compartments 210 can be located in the refrigerator compartment, and some can be located in the middle compartment or the freezer compartment. The at least two independent fresh-keeping compartments 210 mean that after the refrigerator door is closed, air does not circulate between the fresh-keeping compartments 210, forming relatively independent fresh-keeping environments.

[0045] Reference Figure 2The preservation device 100 includes at least two oxygen-enriching components 1, which are configured to correspond to at least two preservation chambers 210. Each oxygen-enriching component 1 includes at least one oxygen-enriching membrane 11 and a collection chamber 12. The oxygen-enriching component 1 allows more oxygen from the preservation chamber 210 to permeate through the oxygen-enriching membrane 11 and enter the collection chamber 12 compared to nitrogen. Thus, the oxygen-enriching component 1 creates a nitrogen-rich, oxygen-poor atmosphere within the preservation chamber 210, which is beneficial for food preservation. This atmosphere reduces the oxygen content in the fruit and vegetable storage space, decreases the intensity of aerobic respiration of the fruits and vegetables while ensuring basic respiration and inhibiting anaerobic respiration, thereby promoting long-term preservation of fruits and vegetables.

[0046] Reference Figure 2 The preservation device 100 further includes an air extraction device 3, which has an air inlet. The air outlet of the oxygen-enriching component 1 is connected to the air inlet of the air extraction device 3. Optionally, an air extraction pipe 41 is connected between the air inlet and the collection chamber 12 of each oxygen-enriching component 1 to draw gas from the collection chamber 12 into the air extraction device 3.

[0047] Specifically, the air extraction device 3 includes an air extraction pump 31, and the air inlet end of the air extraction device 3 is also the air inlet end of the air extraction pump 31. Multiple air extraction pipes 41 are connected to the air inlet end of the air extraction pump 31. Using the air extraction pump 31 provides stable operation, high reliability, and a small size. Of course, some solutions may use a blower to achieve the same air extraction function. For simplicity, the following description will use the air extraction pump 31 as an example.

[0048] In other words, the vacuum pump 31 can extract the gas in the collection chamber 12 to the outside, so that the air in the freshness compartment 210 flows to the oxygen-enriching component 1. Under the action of the oxygen-enriching component 1, some or all of the oxygen in the air in the freshness compartment 210 enters the collection chamber 12 and is then discharged from the freshness compartment 210 through the vacuum pipe 41 and the vacuum pump 31, thereby obtaining a nitrogen-rich and oxygen-poor gas atmosphere in the freshness compartment 210 to facilitate the preservation of food.

[0049] The preservation device 100 for a refrigerator 1000 according to this embodiment of the invention consists of an air extraction device 3 connected to at least two oxygen-enriching components 1, which can achieve a solution of efficient oxygen reduction for multiple preservation compartments 210 by a single air extraction device 3. The number of air extraction devices 3 is reduced, thereby lowering the cost.

[0050] Understandably, during refrigerator use, users frequently open the refrigerator door to take out and put in food. Therefore, each time the fresh food compartment 210 is opened, outside air fills it. After the refrigerator door is closed, the fresh food compartment 210 is in an independent space, and the air extraction device 3 extracts the air from it. The extracted air has a higher oxygen content, thus reducing both the amount of air and the oxygen content in the fresh food compartment 210. The process repeats itself the next time the refrigerator door is opened, so the amount of air and the oxygen content in the fresh food compartment 210 fluctuate. However, the purpose of the fresh food preservation device 100 is to ensure that after the oxygen reduction operation, the fresh food compartment 210 eventually reaches a relatively stable oxygen content, allowing the food to be in a relatively stable low-oxygen environment for a longer period of time when the refrigerator door is not opened.

[0051] Furthermore, different types of food require different oxygen concentrations. Some foods, such as blueberries, have antioxidants like anthocyanins and vitamin C that are easily oxidized, so they require a lower oxygen concentration. Other foods, however, only need a slight reduction in oxygen concentration to significantly inhibit their respiration and achieve preservation.

[0052] To achieve differentiated oxygen concentration design for the preservation compartment 210, at least one oxygen-enriching component 1 in this application is an adjustable oxygen-enriching component, making the oxygen reduction capacity of the corresponding preservation compartment 210 adjustable. Thus, when the required oxygen concentration for preserving food is low, the adjustable oxygen-enriching component can be set higher, resulting in a stronger oxygen reduction capacity for the preservation compartment 210, quickly reaching a low-oxygen state. When the required oxygen concentration for preserving food is not high, the adjustable oxygen-enriching component can be set lower, reducing the oxygen reduction capacity of the preservation compartment 210, quickly reaching the required oxygen reduction state, thus minimizing oxygen consumption.

[0053] By setting at least two oxygen-enriching components 1, both of which can be adjustable, the oxygen reduction capacity of each preservation compartment 210 can be adjusted, thus maintaining a consistent oxygen concentration in both compartments 210 and allowing for differentiated design. Alternatively, some compartments can be adjustable oxygen-enriching components while others are not, allowing for differentiated oxygen concentration design between the two compartments 210.

[0054] In this application, in order to achieve adjustable oxygen reduction capacity in the adjustable oxygen-enrichment component, reference is made to... Figure 2The adjustable oxygen enrichment component includes at least two oxygen enrichment membranes 11, each with a corresponding collection chamber 12. The adjustable oxygen enrichment component also includes branch channels 13 and an adjusting element 14. At least two branch channels 13 are provided, each corresponding to at least two collection chambers 12. One end of each branch channel 13 is connected to a collection chamber 12, and the other end is connected to a suction pipe 41. The adjusting element 14 controls the opening and closing of the branch channels 13 and the number of times the branch channels 13 are opened or closed.

[0055] In other words, the more branch channels 13 are opened, the more oxygen-enriching membranes 11 can extract inhaled oxygen, resulting in a stronger oxygen reduction capacity and a higher setting. The adjusting component 14 can control the oxygen reduction capacity of the oxygen-enriching component 1 by controlling the number of branch channels 13 that are opened.

[0056] It should be noted that the oxygen-enriched membrane 11 is a thin film material that can enrich oxygen on one side of the membrane. Its working principle is mainly based on the diffusion and selective permeation of gas molecules. Diffusion occurs when there is a concentration difference or partial pressure difference between the two sides of the membrane. From the perspective of molecular polarity, the molecular structure of the membrane material may contain groups that have an affinity for oxygen molecules. Therefore, the so-called selective permeation refers to the fact that the oxygen-enriched membrane 11 preferentially adsorbs and transfers oxygen molecules.

[0057] In this application, only branch channel 13 is open. The negative pressure generated at the air inlet of the suction device 3 acts on the oxygen-enriching membrane 11 through the suction pipe 41 and branch channel 13. The pressure difference on both sides drives gas molecules to pass through the oxygen-enriching membrane 11 and enter the collection chamber 12. Only when branch channel 13 is open can oxygen molecules in the preservation chamber 210 continuously and selectively permeate into the oxygen-enriching membrane 11. Therefore, by setting an adjustable oxygen-enriching component, the number of branches 13 that can be switched on and off can be adjusted, thereby adjusting the number of oxygen-enriching membranes 11 that can perform oxygen absorption. This achieves different oxygen reduction capabilities in the preservation chamber 210, realizing a differentiated design of oxygen concentration, which is beneficial for preserving food with different oxygen concentration requirements.

[0058] In some specific embodiments, such as Figure 2 As shown, in the adjustable oxygen-enrichment assembly, the adjusting component 14 includes at least two sub-switches 141. Each sub-switch 141 corresponds one-to-one with a branch channel 13, and each sub-switch 141 independently controls the opening and closing of the branch channel 13. This allows the adjustable oxygen-enrichment assembly to have more gear levels than the number of sub-switches 141, simplifying gear control by only adjusting the number of opening and closing sub-switches 141. Figure 2 Taking a three-neutron-switch-141 configuration as an example, the adjustable oxygen-enriching component can achieve the following settings: zero (all three sub-switches 141 are closed), one (only one sub-switches 141 are open), two (only two sub-switches 141 are open), and three (all three sub-switches 141 are open).

[0059] Alternatively, in some solutions, at least two oxygen-enriching membranes 11 in the same adjustable oxygen-enriching component have different areas, so that more gears can be obtained by controlling the sub-switch 141.

[0060] For example Figure 2 In the example, the adjustable oxygen-enriching component includes three oxygen-enriching membranes 11, each with a different area, designated as A, B, and C respectively. The sub-switches 141 corresponding to the three oxygen-enriching membranes 11 are A, B, and C, respectively. The adjustable oxygen-enriching component can achieve the following settings: zero (A, B, and C are all off), one (A is on, B and C are all off), two (B is on, A and C are all off), three (C is on, A and B are all off), four (A and B are on, C is off), five (A and C are on, B is off), six (B and C are on, A is off), and seven (A, B, and C are all on).

[0061] In this application, the branch channel 13 is an airway for connecting the collection chamber 12 and the suction pipe 41. It can be formed on the side wall of the collection chamber 12 and the suction pipe 41. That is, the branch channel 13 is a perforation on the side wall of the collection chamber 12 and the suction pipe 41. The length of the branch channel 13 is relatively short.

[0062] In some embodiments, the branch 13 is formed by a tube between the collection chamber 12 and the suction pipe 41, and the lumen of the tube constitutes the branch 13.

[0063] Specifically, such as Figure 2 As shown, the adjustable oxygen-enriching component includes at least two hoses 18, the lumens of which form a branch 13. The hoses 18 connect the collection chamber 12 and the extraction pipe 41, facilitating assembly and allowing for flexible arrangement of the extraction device 3 and the oxygen-enriching component 1 according to the internal structure of the refrigerator 1000.

[0064] In other embodiments, the adjustable oxygen enrichment assembly includes a single tube 19 connected between the collection chamber 12 and the extraction tube 41. (See also...) Figure 3 The single tube 19 has multiple channels, each channel serving as a branch 13. Figure 3 This is an end view of the single tube 19 at one end connected to the extraction pipe 41 or at one end of the buffer chamber 15 described below. An adjusting member 14 is rotatably disposed on the end face of the single tube 19. The adjusting member 14 includes multiple closing plates 142, which can be adjusted during rotation to determine the number of closing plates 142 engaging with the openings of the branch channels 13. For example, if there are three branch channels 13, the adjusting member 14 has three closing plates 142. Figure 3The diagram shows the state when all three branch channels 13 are open. When the adjusting member 14 rotates 60 degrees clockwise or counterclockwise, one closing plate 142 engages at the opening of the branch channel 13, at which point two branch channels 13 are open. When the adjusting member 14 rotates 120 degrees clockwise or counterclockwise, two closing plates 142 engage at the opening of the branch channel 13, at which point one branch channel 13 is open. When the adjusting member 14 rotates 180 degrees clockwise or counterclockwise, all three closing plates 142 engage at the opening of the branch channels 13, at which point all three branch channels 13 are closed.

[0065] In some embodiments, such as Figure 2 As shown, the adjustable oxygen enrichment assembly also includes a buffer chamber 15, with the branch 13 and the extraction pipe 41 connected to the buffer chamber 15. All branch 13s in the adjustable oxygen enrichment assembly are connected to the same buffer chamber 15. That is, in the same adjustable oxygen enrichment assembly, the gas collected in all collection chambers 12 first enters the buffer chamber 15 through the branch 13. It can be understood that in a pressure system, the buffer chamber 15 can stabilize the pressure. When at least two branch 13s in the adjustable oxygen enrichment assembly are open, the buffer chamber 15 can ensure a more balanced negative pressure in the corresponding at least two collection chambers 12, which is beneficial for improving the overall oxygen intake capacity.

[0066] Specifically, the adjusting component 14 is located at the connection between the branch channel 13 and the buffer cavity 15. The space here is relatively large, which facilitates the assembly of the adjusting component 14, and the buffer cavity 15 provides the adjusting component 14 with room to move.

[0067] In some embodiments, in the adjustable oxygen-enriching assembly, all oxygen-enriching membranes 11 are located on the same plane, all collection chambers 12 are disposed on the same side of the oxygen-enriching membranes 11, and each pair of adjacent collection chambers 12 is separated by a partition 16. In this way, the collection chambers 12 are relatively concentrated, occupy little space, and are plate-shaped, which facilitates positioning and installation.

[0068] Specifically, in the adjustable oxygen-enriching module, all oxygen-enriching membranes 11 are integral membranes, and the partition plate 16 abuts against the oxygen-enriching membrane 11. Each adjustable oxygen-enriching module only needs to be assembled with a single oxygen-enriching membrane 11, reducing the difficulty of assembly and positioning.

[0069] Furthermore, such as Figure 2 As shown, a sealing strip 17 is provided between the partition 16 and the oxygen-enriching membrane 11. The sealing strip 17 serves to seal, preventing cross-contamination of gases between different collection chambers 12. The sealing strip 17 also maintains a strong negative pressure in the working collection chamber 12, improving its suction capacity. In addition, the sealing strip 17 also acts as a protective component for the oxygen-enriching membrane 11, reducing the likelihood of the partition 16 tearing the oxygen-enriching membrane 11 during vibration.

[0070] Optionally, such as Figure 2As shown, the adjustable oxygen-enriching component includes at least two flexible tubes 18, the lumens of which form branches 13. One end of each flexible tube 18 is connected to the side wall of the collection chamber 12. With this configuration, the oxygen-enriching component 1 maintains a flat overall shape at the oxygen-enriching membrane 11 and the collection chamber 12, allowing it to be placed on the side wall of the preservation chamber 210. The connection between the flexible tubes 18 and the collection chamber 12 also extends along the side wall of the preservation chamber 210, thus receiving protection from the side wall of the preservation chamber 210.

[0071] In some embodiments, such as Figure 2 As shown, the preservation device 100 also includes a turbulence fan 7, which is installed in at least one preservation chamber 210. The turbulence fan 7 can promote uniform gas flow in the preservation chamber 210, resulting in a more uniform and consistent oxygen content throughout the preservation chamber 210. Furthermore, it facilitates the flow of oxygen through the oxygen-enriching membrane 11 and into the collection chamber 12. This improves the oxygen collection efficiency.

[0072] In some embodiments, an oxygen-enriched membrane is a membrane material capable of selectively allowing oxygen to pass through, thereby enriching oxygen on one side of the membrane.

[0073] The basic structural layers include: a surface layer, an active separation layer, and a support layer. The surface layer is the outermost part of the oxygen-enriched membrane 11 that comes into contact with the gas inside the preservation chamber 210. It usually has a special chemical composition and microstructure, and its main function is to preliminarily screen gas molecules. For example, the surface layer of some oxygen-enriched membranes 11 is composed of polymer materials with oxygen-philic groups, which can preferentially adsorb oxygen molecules.

[0074] The outer layer is very thin, typically on the nanometer to micrometer scale. This is to reduce the path length for gas molecule diffusion, allowing oxygen molecules to quickly enter the membrane for subsequent separation processes.

[0075] The active separation layer is the core structural component of the oxygen-enriched membrane 11. It is composed of polymer materials with a special molecular structure, where gaps and channels exist between the molecular chains of these polymers. Its molecular structure selectively allows oxygen molecules to pass through based on the differences in the size, shape, polarity, and other physicochemical properties of oxygen and other gases (such as nitrogen). For example, oxygen molecules, with their relatively small diameter, can pass through the tiny channels in the active separation layer under certain pressure, while larger nitrogen molecules are blocked. The active separation layer is also very thin, typically around a few hundred nanometers, ensuring a high oxygen permeation flux.

[0076] Located below the active separation layer, its main function is to provide mechanical support for the active separation layer. Because the active separation layer is very thin and relatively fragile, the support layer can prevent it from being damaged by external forces such as pressure and tension during use.

[0077] The support layer is typically made of porous polymer or inorganic materials, which possess high strength and stability. Its porous structure allows gas to pass through smoothly in the vertical direction without significantly hindering oxygen permeation. The support layer is relatively thick, generally ranging from tens to hundreds of micrometers.

[0078] Refrigerator 1000 according to an embodiment of the present invention, with reference to Figure 1 The refrigerator 1000 includes a cabinet 200, which has at least two independent fresh-keeping compartments 210. The refrigerator 1000 also includes the aforementioned fresh-keeping device 100 for the refrigerator 1000, with at least two oxygen-enriching components 1 provided corresponding to at least two fresh-keeping compartments 210.

[0079] Thus, by connecting at least two oxygen-enriching components 1 to one exhaust device 3, a highly efficient oxygen reduction solution can be achieved for multiple preservation compartments 210 using a single exhaust device 3. The reduced number of exhaust devices 3 lowers the cost.

[0080] In some embodiments, the refrigerator 1000 has a compressor compartment for housing the compressor. The compressor is the core component of the refrigerator's refrigeration system, equivalent to the "heart" of the refrigerator. It increases the pressure and temperature of the refrigerant gas by compressing it. The compressor compartment is located at the bottom of the refrigerator 1000, where an air extraction device 3 is also installed to concentrate vibration sources at the bottom and dissipate them by conducting them to the ground.

[0081] Other structures of the refrigerator 1000 according to the present invention, such as the compressor, are all prior art and will not be described in detail here.

[0082] The preservation device 100 according to an embodiment of the present invention further includes a controller 95, which is electrically connected to the air extraction device 3 and all the adjustment components 14.

[0083] According to an embodiment of the present invention, the method for preserving food in a refrigerator involves the controller 95, upon receiving a notification that the preservation device 100 is activated, controlling the vacuum device 3 to operate and controlling each adjustment element 14 to alternately enter an oxygen reduction mode and a stable mode. In the oxygen reduction mode, the number of branch channels 13 opened by the adjustment element 14 is greater than the number of branch channels 13 opened by the adjustment element 14 in the stable mode.

[0084] For example, the oxygen-enriching component 1 connected to a certain fresh-keeping compartment 210 is an adjustable oxygen-enriching component. When the fresh-keeping device 100 is turned on, the adjusting component 14 enters the oxygen-reducing mode. The adjusting component 14 is at a high setting, opening more branch channels 13, thus resulting in strong and rapid oxygen reduction, allowing the fresh-keeping compartment 210 to quickly reach the required oxygen concentration. After reaching the required oxygen concentration, since the fresh-keeping compartment 210 is in a relatively sealed environment, the adjusting component 14 can be lowered, opening fewer branch channels 13. In this way, the power consumption of the air extraction device 3 in this fresh-keeping compartment 210 is reduced. It is understandable that the fresh-keeping compartment 210 in the refrigerator 1000 cannot be completely sealed, so after a period of time, the fresh-keeping compartment 210 can still draw in air from the surrounding chambers, causing the oxygen concentration to rise. At this time, the adjusting component 14 enters the oxygen-reducing mode again. In this way, without interference from other factors, the oxygen-reducing mode and the stable mode can alternately cycle.

[0085] It is understandable that the operating parameters of the adjustment component 14 can be the same or different each time it enters the oxygen reduction mode. No specific restrictions are made here.

[0086] This configuration reduces the power consumption and load of the vacuum device 3, extending its service life. Furthermore, it prevents excessively low gas content in the preservation compartment 210 from causing low air pressure, and facilitates maintaining a relatively stable air pressure within the preservation compartment 210 using a stable intermittent mode, thus balancing the overall system pressure.

[0087] Therefore, by controlling the adjustment component 14 to alternate between deoxygenation mode and stable mode, the freshness compartment 210 can perform a period of rapid deoxygenation and then stop deoxygenation or perform slow deoxygenation. This can save power consumption, help maintain system pressure balance, and reduce load.

[0088] It should be noted that, in deoxygenation mode, the number of branch channels 13 that open and the opening time can be preset according to the size of the fresh food compartment 210 and the specific state of the fresh food compartment 210. For example, each time the fresh food compartment 210 enters deoxygenation mode, the duration can be set between 30 minutes and 60 minutes.

[0089] In some embodiments, such as Figure 4 As shown, the preservation device 100 also includes a first detection element 91, which is used to detect the on / off state of the preservation chamber 210 connected to the adjustable oxygen-enriching component.

[0090] Here, the opening and closing method of the crisper compartment 210 determines the detection method of the first detection element 91. For example, if the crisper compartment 210 does not have an independent door and is accessed by the opening and closing of the refrigerator door, the first detection element 91 determines the opening and closing status of the crisper compartment 210 by detecting the opening and closing of the refrigerator door.

[0091] For example, if the fresh food compartment 210 adopts a drawer structure, the first detection element 91 determines the open / closed state of the fresh food compartment 210 by detecting the position of the drawer.

[0092] The first detection element 91 can be a mechanical sensor, such as a micro switch or limit switch. The first detection element 91 can also be an electromagnetic sensor, such as a reed switch or Hall effect sensor. Alternatively, the first detection element 91 can be a photoelectric sensor.

[0093] like Figure 4 As shown, the controller 95 is electrically connected to the first detection element 91, and the controller 95 adjusts the control strategy according to the structural results of the first detection element 91.

[0094] Specifically, when the first detection element 91 detects that the fresh-keeping compartment 210 is open, and then detects that the fresh-keeping compartment 210 is closed, the controller 95 controls the corresponding adjustment element 14 to re-enter the oxygen reduction mode, and then alternates between the stable mode and the oxygen reduction mode. It can be understood that when the fresh-keeping compartment 210 is open, regardless of whether it is in the oxygen reduction mode or the stable mode, a large amount of outside air will enter the fresh-keeping compartment 210, causing the oxygen concentration in the air inside the fresh-keeping compartment 210 to approach the oxygen concentration in the outside environment. Therefore, after the fresh-keeping compartment 210 is closed, the controller 95 controls the adjustment element 14 to open, causing the fresh-keeping compartment 210 to re-enter the oxygen reduction mode. Afterwards, as before, it alternates between the stable mode and the oxygen reduction mode.

[0095] Specifically, the oxygen reduction modes include: a first oxygen reduction mode, which is the oxygen reduction mode entered by the adjustment component 14 after the preservation device 100 is turned on; and a second oxygen reduction mode, which is the oxygen reduction mode entered by the adjustment component 14 after the preservation compartment 210 is first opened and then closed.

[0096] In this case, the duration of the second oxygen reduction mode is shorter than that of the first oxygen reduction mode, and / or, in the second oxygen reduction mode, the number of branch channels 13 opened by the adjustment component 14 is less than the number of branch channels 13 opened by the adjustment component 14 in the first oxygen reduction mode.

[0097] In other words, the oxygen reduction mode entered by the adjustment component 14 after the preservation device 100 is turned on, and the oxygen reduction mode entered by the adjustment component 14 after the preservation compartment 210 is turned on and then closed, have different operating parameters. These differences could be in duration, speed, or both.

[0098] Understandably, when the freshness-reducing device 100 is first turned on, the air content inside the refrigerator 1000 is almost the same as the outside air content. At this time, to quickly reach the target oxygen concentration in the freshness-reducing compartment 210, this can be achieved by running the oxygen-reducing mode for a longer period or by increasing the setting. However, when the freshness-reducing compartment 210 is opened and then closed, the oxygen concentration inside and around the compartment has already decreased because it has previously undergone the oxygen-reducing mode. Even if the compartment 210 is briefly opened, the amount of air introduced will not immediately fill the entire compartment and surrounding gaps. Therefore, in this case, the duration of the oxygen-reducing mode operation can be appropriately shortened, or the setting can be appropriately lowered, which can also quickly bring the oxygen concentration inside the compartment 210 to the target.

[0099] Specifically, the oxygen reduction mode also includes a third oxygen reduction mode, and all other oxygen reduction modes are classified as the third oxygen reduction mode. That is, among the oxygen reduction modes, apart from the first and second oxygen reduction modes, the remaining oxygen reduction modes can be categorized as the third oxygen reduction mode. In other words, when the freshness compartment 210 is in the closed state, the oxygen reduction mode that enters after each stabilization mode is classified as the third oxygen reduction mode.

[0100] Optionally, the duration of the third oxygen reduction mode is shorter than that of the first oxygen reduction mode, and / or, in the third oxygen reduction mode, the number of branch channels 13 opened by the adjustment component 14 is less than that in the first oxygen reduction mode. It is understandable that when the preservation device 100 is first turned on, the air content inside the refrigerator 1000 is almost the same as the outside air content. At this time, to quickly reach the target oxygen concentration in the preservation compartment 210, this can be achieved by running the oxygen reduction mode for a longer period or by increasing the setting. However, since the preservation compartment 210 has already experienced the oxygen reduction mode, the oxygen concentration inside and around the preservation compartment 210 has decreased. Even if the preservation compartment 210 then experiences a stable mode, even if the oxygen-enriching component 1 does not absorb oxygen from the preservation compartment 210, the amount of air that the preservation compartment 210 can draw in from the surroundings is also relatively small. Therefore, the preservation compartment 210 will maintain a low-oxygen state for a period of time. When the fresh food compartment 210 enters the deoxygenation mode again, this deoxygenation mode can be set to the third deoxygenation mode. Compared with the first deoxygenation mode, the third deoxygenation mode can appropriately shorten the running time of the deoxygenation mode or appropriately lower the deoxygenation mode level, so that the oxygen concentration in the fresh food compartment 210 can quickly reach the target.

[0101] Optionally, the duration of the third oxygen reduction mode is shorter than the duration of the second oxygen reduction mode, and / or, the number of branch channels 13 opened by the adjustment component 14 in the third oxygen reduction mode is less than the number of branch channels 13 opened by the adjustment component 14 in the second oxygen reduction mode. It is understood that before the third oxygen reduction mode, the freshness compartment 210 is in a low-oxygen state for a longer period, and when the freshness compartment 210 is opened, outside air is rapidly injected. Therefore, the former requires a lower amount of oxygen to be extracted. Based on this, the operating time of the third oxygen reduction mode can be shortened relative to the second oxygen reduction mode, or the speed of the third oxygen reduction mode can be lowered relative to the second oxygen reduction mode, or both the operating time and speed of the third oxygen reduction mode can be shortened relative to the second oxygen reduction mode.

[0102] It should be noted that the freshness preservation device 100 can be turned on automatically or manually. Automatic activation of the freshness preservation device 100 can occur either when the refrigerator 1000 is powered on, or when it detects that the freshness preservation compartment 210 contains an object.

[0103] When the preservation device 100 is automatically turned on after the refrigerator 1000 is powered on, the refrigerator 1000 receives the power-on signal and sends the signal to the controller 95. The controller 95 controls the operation of the vacuum device 3 and the adjustment device 14.

[0104] When the preservation device 100 automatically turns on when it detects that the preservation compartment 210 contains an object, it sends this signal to the controller 95, and the controller 95 controls the operation of the air extraction device 3 and the adjustment component 14.

[0105] When the preservation device 100 is manually turned on, the manual turn signal controller 95 is activated, and the controller 95 controls the operation of the air extraction device 3 and the adjustment component 14.

[0106] Of course, the preservation device 100 can also be controlled in other ways, such as by pre-setting the start time through the refrigerator 1000's operating program, and the controller 95 controls the operation of the vacuum device 3 and the adjustment component 14 according to the pre-set start time.

[0107] In this application, the duration of the oxygen reduction mode can be automatically controlled by timing or by controlling the oxygen concentration.

[0108] For example, in some specific embodiments, when the oxygen reduction mode meets the preset oxygen reduction duration, the control adjustment component 14 switches to the stable mode; when the stable mode meets the preset stable duration, the control adjustment component 14 switches to the oxygen reduction mode. In other words, the preset oxygen reduction duration and preset stable duration, i.e., the duration of the oxygen reduction mode and the duration of the stable mode, are preset time lengths, pre-set within the controller 95. This simplifies the control method, eliminates the need for additional sensors, and saves costs.

[0109] For example, in some specific embodiments, such as Figure 4 As shown, the preservation device 100 also includes a second detection element 92, which is used to detect the oxygen concentration of the preservation chamber 210 connected to the adjustable oxygen enrichment component, and the controller 95 is electrically connected to the second detection element 92.

[0110] In oxygen reduction mode, when the second detector 92 detects that the oxygen concentration has reached the first preset range, the control adjustment component 14 switches to stable mode. In stable mode, when the second detector 92 detects that the oxygen concentration has reached the second preset range, the control adjustment component 14 switches to oxygen reduction mode.

[0111] In other words, the duration of the oxygen reduction mode is uncertain. After the freshness compartment 210 enters the oxygen reduction mode, the adjustment component 14 switches to the stable mode only when the oxygen concentration drops to the first set range. Similarly, the duration of the stable mode is also uncertain. After the freshness compartment 210 enters the stable mode, the adjustment component 14 switches to the oxygen reduction mode only when the oxygen concentration rises to the second set range. Here, the first and second set ranges are not limited.

[0112] By controlling the duration of the oxygen de-oxygenation mode and the duration of the stabilization mode using oxygen concentration, the accuracy of oxygen concentration control can be improved, thereby enhancing the preservation effect of the freshness compartment 210.

[0113] In some embodiments, at least two oxygen-enriching components 1 are adjustable oxygen-enriching components, and the corresponding setting of one of the fresh-keeping compartments 210 is higher than that of the other fresh-keeping compartment 210. That is, at least two fresh-keeping compartments 210 have adjustable settings.

[0114] When one of the preservation compartments 210 is set to a higher setting than the other, the former becomes the higher-setting preservation compartment 210, and the latter becomes the lower-setting preservation compartment 210.

[0115] The controller 95 is used to control: the duration of the high-grade preservation compartment 210 in the deoxygenation mode is greater than the duration of the low-grade preservation compartment 210 in the deoxygenation mode; and / or, the number of branch channels 13 opened in the high-grade preservation compartment 210 in the deoxygenation mode is greater than the number of branch channels 13 opened in the low-grade preservation compartment 210 in the deoxygenation mode.

[0116] In other words, if both preservation compartments 210 simultaneously enter the deoxygenation mode, and the oxygen concentration in both compartments 210 drops to a certain level, the lower-level preservation compartment 210 will stop the deoxygenation mode and enter a stable mode. Meanwhile, the higher-level preservation compartment 210 will continue the deoxygenation mode until the required oxygen concentration is reached, at which point it will stop the deoxygenation mode and enter a stable mode.

[0117] Alternatively, if both preservation compartments 210 enter deoxygenation mode, the higher-level preservation compartment 210 will have more branch channels 13 open, while the lower-level preservation compartment 210 will have fewer branch channels 13 open. Even if both compartments enter deoxygenation mode simultaneously, the oxygen level in the higher-level preservation compartment 210 will decrease faster. When both preservation compartments 210 simultaneously stop deoxygenation mode and enter stable mode, the oxygen concentration in the higher-level preservation compartment 210 will be lower than the oxygen concentration in the lower-level preservation compartment 210.

[0118] Alternatively, if both fresh-keeping compartments 210 enter the deoxygenation mode, not only will the high-grade fresh-keeping compartment 210 remain in the deoxygenation mode for a longer period of time, but the number of its branch channels 13 that open in the high-grade fresh-keeping compartment 210 will also be greater.

[0119] Here, the entry time for the deoxygenation mode of the two preservation compartments 210 can be set to enter simultaneously or to enter separately based on timing.

[0120] In the above scheme, the control of the oxygen reduction mode can also be set in combination. For example, in Figure 2 In the example, the target oxygen concentration for the left and right preservation compartments 210 is 2:3. Since the left compartment 210 requires a lower oxygen concentration, the adjustment mechanism 14 opens three sub-switches 141, and the right adjustment mechanism 14 opens two sub-switches 141 to execute the operation. Then, the vacuum pump 31 is turned on, and the switch is turned off after time T1. If the oxygen concentration in one of the preservation compartments 210 has not yet reached the limit, the switch for the compartment requiring further oxygen reduction can remain open until the predetermined oxygen concentration is reached after time T2, at which point all switches are closed.

[0121] Specifically, controller 95 controls the following: the duration of the high-grade preservation compartment 210 in stable mode is shorter than the duration of the low-grade preservation compartment 210 in stable mode; and / or, the number of branch channels 13 opened in the high-grade preservation compartment 210 in stable mode is greater than the number of branch channels 13 opened in the low-grade preservation compartment 210 in stable mode. It is understood that because the high-grade preservation compartment 210 maintains a lower oxygen concentration, more gas is drawn out in the deoxygenation mode, resulting in lower air pressure inside the compartment 210. After entering stable mode, due to the pressure difference between the inside and outside, the high-grade preservation compartment 210 more easily draws in surrounding air, leading to an increase in oxygen concentration. Therefore, the duration of the high-grade preservation compartment 210 in stable mode can be relatively shortened, allowing it to enter deoxygenation mode earlier. Alternatively, the high-grade preservation compartment 210 can remain in stable mode with branch channels 13 still open, continuing to be deoxygenated, thus allowing it to maintain stable mode for a relatively longer period.

[0122] In this application, the settings for different preservation compartments 210 can be preset or set by user input.

[0123] For example, such as Figure 4 As shown, the preservation device 100 also includes an input component 96, which is electrically connected to the controller 95 and used to input the setting of the preservation compartment 210. That is, the user can control the setting of the preservation compartment 210, which has any adjustable setting. The adjustment method is not limited, nor is the structure of the input component 96. For example, the input component 96 can be an input keyboard, input buttons, a touch screen, or a recorder.

[0124] In some embodiments of this application, after the preservation device 100 is turned on, the controller 95 controls the vacuum device 3 to keep running continuously. This eliminates the need for frequent switching of the vacuum device 3, reducing the frequency of switching and minimizing the impact and wear generated during switching.

[0125] In other designs, after the preservation device 100 is activated, the controller 95 controls the exhaust device 3 to operate when at least one branch 13 is opened. This can further reduce energy consumption.

[0126] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0127] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for preserving food in a refrigerator, characterized in that, The refrigerator has at least two independent preservation compartments, and the preservation device includes: At least two oxygen-enriching components are provided, and these at least two oxygen-enriching components are correspondingly connected to at least two of the preservation compartments. Each oxygen-enriching component includes an oxygen-enriching membrane and a collection chamber. The oxygen-enriching component is used to allow more oxygen from the preservation compartment to permeate through the oxygen-enriching membrane and enter the collection chamber compared to nitrogen. Air extraction device; Wherein, at least one of the oxygen-enriching components is an adjustable oxygen-enriching component, wherein there are at least two oxygen-enriching membranes in the adjustable oxygen-enriching component, each of the oxygen-enriching membranes is provided with a corresponding collection chamber, the adjustable oxygen-enriching component further includes: a branch channel and an adjusting component, wherein there are at least two branches channel and each branch channel is provided with at least two collection chambers, one end of each branch channel is connected to the collection chamber and the other end is connected to the air extraction device, and the adjusting component is used to control the opening and closing of the branch channel and to control the number of opening and closing of the branch channel; The controller is electrically connected to the air extraction device and all the adjustment components; When the controller receives a notification that the preservation device is activated, it controls the air extraction device to operate and controls each adjustment component to alternately enter the deoxygenation mode and the stable mode. In the deoxygenation mode, the number of branch channels opened by the adjustment component is greater than the number of branch channels opened by the adjustment component in the stable mode.

2. The method for preserving food in a refrigerator according to claim 1, characterized in that, The preservation device also includes: The first detection element is used to detect the on / off state of the fresh-keeping compartment connected to the adjustable oxygen-enriching component, and the controller is electrically connected to the first detection element. When the first detection device detects that the fresh-keeping compartment is open, and then detects that the fresh-keeping compartment is closed, the controller controls the corresponding adjustment device to re-enter the oxygen reduction mode, and then alternately enters the stable mode and the oxygen reduction mode.

3. The method for preserving food in a refrigerator according to claim 2, characterized in that, The oxygen reduction mode includes: The first oxygen reduction mode is the oxygen reduction mode that the adjustment component enters after the preservation device is turned on. The second oxygen reduction mode is the oxygen reduction mode that the adjustment device enters after the freshness compartment is opened and then closed. Wherein, the duration of the second oxygen reduction mode is shorter than the duration of the first oxygen reduction mode, and / or, the number of branch channels opened by the gear shifting component in the second oxygen reduction mode is less than the number of branch channels opened by the gear shifting component in the first oxygen reduction mode.

4. The method for preserving food in a refrigerator according to claim 3, characterized in that, The oxygen reduction mode also includes: The third oxygen reduction mode, and the other oxygen reduction modes are the third oxygen reduction mode; The duration of the third oxygen reduction mode is shorter than the duration of the first oxygen reduction mode and the second oxygen reduction mode, and / or, in the third oxygen reduction mode, the number of branches opened by the gear shifting component is less than the number of branches opened by the gear shifting component in the first oxygen reduction mode and the second oxygen reduction mode.

5. The method for preserving food in a refrigerator according to claim 1, characterized in that, When the oxygen reduction mode meets the preset oxygen reduction duration, the control unit is switched to the stable mode; When the stable mode meets the preset stable duration, the control unit switches to the oxygen reduction mode.

6. The method for preserving food in a refrigerator according to claim 1, characterized in that, The preservation device also includes: The second detection element is used to detect the oxygen concentration in the fresh-keeping compartment connected to the adjustable oxygen-enriching component, and the controller is electrically connected to the second detection element. In the oxygen reduction mode, when the second detection element detects that the oxygen concentration has reached the first set range, the control element switches to the stable mode. In the stable mode, when the second detection element detects that the oxygen concentration has reached the second set range, it controls the adjustment element to switch to the oxygen reduction mode.

7. The method for preserving food in a refrigerator according to any one of claims 1-6, characterized in that, At least two of the oxygen-enriching components are adjustable oxygen-enriching components, and the setting of one of the fresh-keeping compartments is higher than that of the other fresh-keeping compartment. The controller is used to control: The duration of the high-level preservation compartment in the deoxygenation mode is greater than the duration of the low-level preservation compartment in the deoxygenation mode. And / or, the number of branches opened in the high-level preservation compartment in the deoxygenation mode is greater than the number of branches opened in the low-level preservation compartment in the deoxygenation mode.

8. The method for preserving food in a refrigerator according to claim 7, characterized in that, The controller is used to control: The duration of the high-end preservation compartment in the stable mode is less than the duration of the low-end preservation compartment in the stable mode. And / or, the number of aisles opened in the high-end preservation compartment in the stable mode is greater than the number of aisles opened in the low-end preservation compartment in the stable mode.

9. The method for preserving food in a refrigerator according to claim 7, characterized in that, The preservation device also includes: An input device, which is electrically connected to the controller, is used to input the setting of the freshness compartment.

10. The method for preserving food in a refrigerator according to any one of claims 1-6, characterized in that, After the preservation device is turned on, the controller controls the air extraction device to keep running continuously. Alternatively, after the preservation device is turned on, the controller controls the air extraction device to operate when at least one of the branch channels is opened.

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