Fresh-keeping device for refrigerator and refrigerator

Abstract

The utility model discloses a fresh-keeping device for a refrigerator and the refrigerator, and relates to the field of refrigerators. The refrigerator is provided with at least two mutually independent fresh-keeping chambers, the fresh-keeping device comprises at least two oxygen-enriched assemblies, and each oxygen-enriched assembly comprises an oxygen-enriched membrane and a collecting cavity; and an air extractor. At least one oxygen enrichment assembly is a gear-adjustable oxygen enrichment assembly, the number of oxygen enrichment membranes in the gear-adjustable oxygen enrichment assembly is at least two, and each oxygen enrichment membrane is correspondingly provided with a collecting cavity. The gear-adjustable oxygen enrichment assembly further comprises at least two branch channels and a gear adjusting piece, the branch channels correspond to the at least two collecting cavities, one end of each branch channel is connected with the collecting cavity, the other end of each branch channel is connected with the exhaust pipe, and the gear adjusting piece is used for controlling opening and closing of the branch channels and controlling the opening and closing number of the branch channels. According to the fresh-keeping device disclosed by the utility model, a single air extractor is used for efficiently reducing oxygen in a plurality of fresh-keeping chambers, so that the cost is relatively low. And the oxygen reduction capacity of the fresh-keeping chamber can be adjusted, and the requirements for oxygen concentration of different types of food materials can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of refrigerator, in particular to a kind of fresh-keeping device for refrigerator and refrigerator. BACKGROUND

[0002] Low oxygen is a better preservation way for food preservation, and the benefit of low oxygen for fruit and vegetable preservation is that it can effectively inhibit the respiration of fruits and vegetables and reduce the consumption of organic matter, thereby prolonging the preservation period of fruits and vegetables. Therefore, more and more oxygen control preservation technologies appear on the market, such as MSA modified atmosphere preservation.

[0003] In the prior art, for the multi-chamber preservation scheme, the number of parts is usually large and the cost is high. Therefore, how to control the cost and achieve the multi-chamber preservation scheme with a simple structure is one of the research directions that need to be supplemented in the prior art. Moreover, different types of food require different oxygen concentrations, and how to achieve differentiated oxygen concentration design is also one of the research directions. UTILITY MODEL CONTENT

[0004] The utility model aims to solve at least one of the technical problems in the prior art. Therefore, the utility model provides a fresh-keeping device for refrigerator and refrigerator, which can realize the preservation scheme of each chamber with a simple structure and low cost.

[0005] According to the fresh-keeping device for refrigerator of the utility model embodiment, the refrigerator has at least two independent preservation chambers, and the fresh-keeping device comprises: at least two oxygen enrichment assemblies corresponding to the at least two preservation chambers, each oxygen enrichment assembly comprising at least one oxygen enrichment membrane and a collection cavity, the oxygen enrichment assembly being used to make the oxygen in the preservation chamber penetrate the oxygen enrichment membrane and enter the collection cavity more than nitrogen; and a gas suction device, wherein a gas suction pipe is connected between the gas suction device and the collection cavity of each oxygen enrichment assembly to suck the gas in the collection cavity into the gas suction device.

[0006] Among them, at least one of the oxygen enrichment assemblies is an adjustable profile oxygen enrichment assembly, the oxygen enrichment membrane in the adjustable profile oxygen enrichment assembly is at least two, each oxygen enrichment membrane is provided with a collection cavity, the adjustable profile oxygen enrichment assembly further comprises: a branch and an adjustment part, the branch is at least two and is provided corresponding to at least two collection cavities, one end of each branch is connected to the collection cavity and the other end is connected to the gas suction pipe, the adjustment part is used to control the opening and closing of the branch, and the number of the opening and closing of the branch is controlled.

[0007] The fresh-keeping device for refrigerator of the utility model embodiment is connected to at least two oxygen enrichment assemblies by one gas suction device, which can realize the scheme of efficiently reducing oxygen in multiple preservation chambers by a single gas suction device. The number of gas suction devices is reduced, and the cost is reduced.

[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] In some embodiments, the adjustable oxygen-enrichment component includes at least two sub-switches, each sub-switch being configured to correspond one-to-one with a branch channel, and each sub-switch independently controlling the switching of the branch channel.

[0010] In some embodiments, the adjustable oxygen enrichment assembly further includes a buffer chamber, which is connected between the branch and the extraction pipe, and all the branch in the adjustable oxygen enrichment assembly are connected to the same buffer chamber.

[0011] Specifically, the adjusting component is located at the connection between the branch channel and the buffer cavity.

[0012] In some embodiments, in the adjustable oxygen-enriching assembly, all the oxygen-enriching membranes are located on the same plane, all the collection chambers are disposed on the same side of the oxygen-enriching membranes, and each pair of adjacent collection chambers are separated by a partition.

[0013] Specifically, in the adjustable oxygen-enriching component, all the oxygen-enriching membranes are integral membranes, and the partition plate abuts against the oxygen-enriching membrane.

[0014] Furthermore, a sealing strip is provided between the partition and the oxygen-enriched membrane.

[0015] Furthermore, the adjustable oxygen enrichment component includes at least two hoses, the lumens of which form the branch channels, and one end of each hose is connected to the side wall of the collection chamber.

[0016] In some embodiments, the preservation device further includes a turbulence fan for placement in at least one of the preservation chambers.

[0017] According to an embodiment of the present invention, a refrigerator includes a cabinet, wherein at least two independent fresh-keeping compartments are provided inside the cabinet; the refrigerator also includes the aforementioned fresh-keeping device for refrigerators, wherein at least two of the oxygen-enriching components are provided corresponding to at least two of the fresh-keeping compartments.

[0018] Additional aspects and advantages of this 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

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 Structure diagram of the refrigerator according to the embodiments of the present application;

[0021] Figure 2 Assembly relationship diagram of the fresh-keeping device and the fresh-keeping chamber according to some embodiments;

[0022] Figure 3 Assembly relationship diagram of the single pipe and the adjusting member on the end surface according to other embodiments.

[0023] Reference signs:

[0024] Refrigerator 1000,

[0025] Fresh-keeping device 100,

[0026] Oxygen enrichment assembly 1,

[0027] Oxygen enrichment film 11, collecting cavity 12, branch 13, adjusting member 14, sub-switch 141, closing plate 142, buffer cavity 15, partition plate 16, sealing strip 17, hose 18, single pipe 19,

[0028] Air extraction device 3, air extraction pump 31,

[0029] Air extraction pipe 41,

[0030] Air inlet pipe 42,

[0031] Fan 7,

[0032] Box 200, fresh-keeping chamber 210. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0034] In the description of the utility model, need understanding, the term "center" "thickness" "upper" "lower" "front" "back" "left" "right" "vertical" "horizontal" "top" "bottom" "inner" "outer" "axial" "radial" "circumferential" such as the orientation or positional relationship indicated in the drawing is based on the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first", "second" can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] The following refers to Figures 1-3 The fresh-keeping device 100 for the refrigerator and the refrigerator 1000 according to the embodiments of the utility model are described.

[0037] As Figure 1 The refrigerator 1000 has at least two independent fresh-keeping chambers 210, the positions of the fresh-keeping chambers 210 are not limited, and they can be arranged in the same chamber of the refrigerator 1000, for example, they can both be arranged in the refrigerating chamber of the refrigerator 1000, or they can both be arranged in the intermediate chamber or other chamber (such as the freezing chamber) of the refrigerator 1000. Alternatively, at least two fresh-keeping chambers 210 are arranged in different chambers of the refrigerator 1000, for example, part of the fresh-keeping chambers 210 are arranged in the refrigerating chamber of the refrigerator 1000, and part of the fresh-keeping chambers 210 are arranged in the intermediate chamber or the freezing chamber of the refrigerator 1000. The at least two fresh-keeping chambers 210 are independent of each other, which means that the air does not flow between the fresh-keeping chambers 210 after the refrigerator door is closed, forming a relatively independent fresh-keeping environment.

[0038] Referring to Figure 2The fresh-keeping device 100 comprises at least two oxygen-enriching assemblies 1, the at least two oxygen-enriching assemblies 1 are arranged corresponding to at least two fresh-keeping chambers 210, each oxygen-enriching assembly 1 comprises at least one oxygen-enriching film 11 and a collecting cavity 12, and the oxygen-enriching assembly 1 is used for making oxygen in the fresh-keeping chamber 210 more permeate through the oxygen-enriching film 11 and enter the collecting cavity 12 than nitrogen. Therefore, the oxygen-enriching assembly 1 can make the fresh-keeping chamber 210 form a gas atmosphere beneficial to fresh-keeping of food materials, the gas atmosphere reduces the content of oxygen in the fruit and vegetable storage space, reduces the intensity of aerobic respiration of the fruit and vegetable, ensures basic respiration at the same time, inhibits anaerobic respiration of the fruit and vegetable, and thus is beneficial to long-term fresh-keeping of the fruit and vegetable.

[0039] With reference to Figure 2 The fresh-keeping device 100 further comprises an air extraction device 3, the air extraction device 3 has an air inlet end, and the air inlet end is connected with the collecting cavity 12 of each oxygen-enriching assembly 1 through an air extraction pipe 41 to suck the gas in the collecting cavity 12 into the air extraction device 3.

[0040] Specifically, the air extraction device 3 comprises an air extraction pump 31, the air inlet end of the air extraction device 3, that is, the air inlet end of the air extraction pump 31, is connected with the air inlet end of the air extraction pump 31 through a plurality of air extraction pipes 41. The air extraction pump 31 is adopted, and the air extraction pump 31 is stable in operation, high in reliability and small in size. Of course, an air blower can also be adopted to achieve the air extraction function. In order to simplify the description, the air extraction pump 31 is taken as an example in the following description.

[0041] That is to say, the air extraction pump 31 can extract the gas in the collecting cavity 12 outward, so that the air in the fresh-keeping chamber 210 flows to the oxygen-enriching assembly 1, and part or all of the oxygen in the air in the fresh-keeping chamber 210 enters the collecting cavity 12 under the action of the oxygen-enriching assembly 1, and then is discharged from the fresh-keeping chamber 210 through the air extraction pipe 41 and the air extraction pump 31, so that the gas atmosphere of the fresh-keeping chamber 210 is obtained, and the gas atmosphere is rich in nitrogen and poor in oxygen, and is beneficial to fresh-keeping of food materials.

[0042] The fresh-keeping device 100 for the refrigerator 1000 in the embodiment of the utility model can realize the scheme that a single air extraction device 3 is used to efficiently reduce oxygen for multiple fresh-keeping chambers 210, the number of the air extraction device 3 is reduced, and the cost is reduced.

[0043] It can be understood that, during use of the refrigerator 1000, the refrigerator door will be opened by the user from time to time to take or place foodstuffs. Therefore, each time the fresh-keeping chamber 210 is opened, external air will fill the fresh-keeping chamber 210. After the refrigerator door is closed, the fresh-keeping chamber 210 is in an independent space, and the air extraction device 3 operates to extract air in the fresh-keeping chamber 210. The oxygen content in the extracted air is relatively high, so that not only the air volume in the fresh-keeping chamber 210 decreases, but also the oxygen content decreases. The above process is repeated when the refrigerator door is opened next time, so that the air volume and the oxygen content in the fresh-keeping chamber 210 are in a floating state. However, the purpose of the fresh-keeping device 100 is to enable the fresh-keeping chamber 210 to finally reach a relatively stable oxygen content after the oxygen reduction operation is completed, so that the foodstuffs can be kept in a relatively stable low-oxygen environment for a relatively long time when the refrigerator door is not opened.

[0044] Further, different types of foodstuffs require different oxygen concentrations. For example, blueberries contain anthocyanins and VC, which are easily oxidized, so a lower oxygen concentration is required. For some foodstuffs, the respiration can be greatly inhibited by slightly reducing the oxygen concentration to achieve the purpose of preservation.

[0045] To achieve the differentiated oxygen concentration design of the fresh-keeping chambers 210, in the present application, at least one oxygen enrichment assembly 1 is an adjustable-gear oxygen enrichment assembly, so that the oxygen reduction capacity of the corresponding fresh-keeping chamber 210 is adjustable. In this way, when the oxygen concentration required for the foodstuffs to be stored is low, the gear of the adjustable-gear oxygen enrichment assembly can be adjusted to a high gear, so that the oxygen reduction capacity of the fresh-keeping chamber 210 is strong, and the low-oxygen state is quickly reached. When the oxygen concentration required for the foodstuffs to be stored is not high, the gear of the adjustable-gear oxygen enrichment assembly can be adjusted to a low gear, so that the oxygen reduction capacity of the fresh-keeping chamber 210 is weakened, and the required oxygen reduction state is quickly reached, so that the oxygen reduction consumption is low.

[0046] By providing at least two oxygen enrichment assemblies 1, each of which can be an adjustable-gear oxygen enrichment assembly, the oxygen reduction capacity of each fresh-keeping chamber 210 can be adjusted. In this way, the oxygen concentrations of the two fresh-keeping chambers 210 can be kept consistent, or differentiated. Some of the oxygen enrichment assemblies 1 can be adjustable-gear oxygen enrichment assemblies, and some can be non-adjustable-gear oxygen enrichment assemblies. In this way, the oxygen reduction capacity of some fresh-keeping chambers 210 can be adjusted, and the oxygen reduction capacity of some fresh-keeping chambers 210 cannot be adjusted, so that the oxygen concentrations of the two fresh-keeping chambers 210 can be differentiated.

[0047] In the present application, to adjust the oxygen reduction capacity of the adjustable-gear oxygen enrichment assembly, the adjustable-gear oxygen enrichment assembly can be provided with a gear adjustment mechanism. Figure 2The oxygen-enriching membrane 11 in the adjustable-gear oxygen-enriching assembly is provided as at least two, and each oxygen-enriching membrane 11 is correspondingly provided with a collection cavity 12. The adjustable-gear oxygen-enriching assembly further comprises branch channels 13 and a gear adjusting member 14. The branch channels 13 are provided as at least two and correspond to the at least two collection cavities 12, one end of each branch channel 13 is connected to the collection cavity 12 and the other end is connected to the air extraction pipe 41, and the gear adjusting member 14 is used to control the opening and closing of the branch channels 13, and the number of the branch channels 13 that are opened and closed is controlled.

[0048] That is, the more the branch channels 13 that are opened, the more the oxygen-enriching membranes 11 that can extract the inhaled oxygen, and the stronger the oxygen reduction ability and the higher the gear. The gear adjusting member 14 can control the oxygen reduction ability of the oxygen-enriching assembly 1 by controlling the number of the branch channels 13 that are opened.

[0049] It should be noted that the oxygen-enriching membrane 11 is a kind of thin film material that can enrich oxygen on one side of the membrane, and its working principle is mainly based on the diffusion and selective permeation of gas molecules. When there is a concentration difference or a partial pressure difference between the two sides of the membrane, the gas molecules will diffuse. From the perspective of molecular polarity, the molecular structure of the membrane material may contain groups that have affinity for oxygen molecules, so the so-called selective permeation means that the oxygen-enriching membrane 11 preferentially adsorbs and transmits oxygen molecules.

[0050] In the present application, only the branch channels 13 are opened, and the negative pressure generated by the air inlet end of the air extraction device 3 acts on the oxygen-enriching membrane 11 through the air extraction pipe 41 and the branch channels 13, and the pressure difference between the two sides drives the gas molecules to permeate through the oxygen-enriching membrane 11 into the collection cavity 12. Only when the branch channels 13 are opened, the oxygen molecules in the fresh-keeping chamber 210 can continuously selectively permeate through the oxygen-enriching membrane 11. Therefore, when the adjustable-gear oxygen-enriching assembly is provided, the number of the branch channels 13 that are opened and closed can be adjusted, so that the number of the oxygen-enriching membranes 11 that can play a role in absorbing oxygen can be adjusted, thereby achieving different oxygen reduction abilities of the fresh-keeping chamber 210 and realizing the differential design of the oxygen concentration, which is beneficial to the preservation of food materials with different oxygen concentration requirements.

[0051] In some specific embodiments, as shown in Figure 2 In the adjustable-gear oxygen-enriching assembly, the gear adjusting member 14 comprises at least two sub-switches 141, and the sub-switches 141 are provided one by one corresponding to the branch channels 13, and each sub-switch 141 independently controls the opening and closing of the branch channels 13. In this way, the number of gears obtained in the adjustable-gear oxygen-enriching assembly can be set to be more than the number of sub-switches 141, and the control mode of the gears is relatively simple, which only needs to adjust the number of the sub-switches 141 that are opened and closed. Figure 2 For example, when the number of sub-switches 141 is three, the adjustable-gear oxygen-enriching assembly can obtain zero gear (all three sub-switches 141 are closed), one gear (only one sub-switch 141 is opened), two gears (only two sub-switches 141 are opened), and three gears (all three sub-switches 141 are opened).

[0052] Or in some schemes, in the same adjustable oxygen-rich component, the area of at least two oxygen-rich membranes 11 is not equal, so that more gears can be obtained by controlling the sub-switch 141.

[0053] For example Figure 2 In the example, the adjustable oxygen-rich component includes three oxygen-rich membranes 11, the areas of the three oxygen-rich membranes 11 are not equal, and are A, B, and C in turn. The sub-switches 141 corresponding to the three oxygen-rich membranes 11 are A, B, and C respectively. The adjustable oxygen-rich component can obtain zero gear (A, B, and C are all closed), one gear (A is opened, and B and C are both closed), two gears (B is opened, and A and C are both closed), three gears (C is opened, and A and B are both closed), four gears (A and B are opened, and C is closed), five gears (A and C are opened, and B is closed), six gears (B and C are opened, and A is closed), and seven gears (A, B, and C are all opened).

[0054] In the scheme of the present application, the branch 13 is an airway for connecting the collecting cavity 12 and the exhaust pipe 41, and can be formed on the side wall of the collecting cavity 12 and the exhaust pipe 41, that is, the branch 13 is a perforation on the side wall of the collecting cavity 12 and the exhaust pipe 41, and the length of the branch 13 is relatively short.

[0055] In some embodiments, the branch 13 is formed by a pipe body between the collecting cavity 12 and the exhaust pipe 41, and the lumen of the pipe body constitutes the branch 13.

[0056] Specifically, as Figure 2 shown, the adjustable oxygen-rich component includes at least two hoses 18, and the lumens of the hoses 18 constitute the branches 13. The hoses 18 are connected between the collecting cavity 12 and the exhaust pipe 41, facilitating assembly and flexible arrangement of the exhaust device 3 and the oxygen-rich component 1 according to the internal structure of the refrigerator 1000.

[0057] In other embodiments, the adjustable oxygen-rich component includes a single pipe 19 connected between the collecting cavity 12 and the exhaust pipe 41. Referring to Figure 3 , the single pipe 19 is provided with a plurality of holes, and each hole serves as a branch 13. Figure 3 The end face view of the single pipe 19 at the end connected to the exhaust pipe 41 or the buffer cavity 15 described below. The gear 14 is rotatably arranged on the end face of the single pipe 19, and the gear 14 includes a plurality of closing plates 142, which can be adjusted to cooperate with the number of openings of the branch 13 in rotation. For example, the branch 13 is three, the gear 14 has three closing plates 142, Figure 3The three branches 13 are shown in the state of being all opened. When the shifting part 14 rotates 60 degrees clockwise or counterclockwise, one closing plate 142 is matched at the opening of the branch 13, at this time, two branches 13 are opened. When the shifting part 14 rotates 120 degrees clockwise or counterclockwise, two closing plates 142 are matched at the opening of the branch 13, at this time, one branch 13 is opened. When the shifting part 14 rotates 180 degrees clockwise or counterclockwise, three closing plates 142 are matched at the opening of the branch 13, at this time, three branches 13 are all closed.

[0058] In some embodiments, as shown in Figure 2 The adjustable shifting oxygen enrichment assembly further comprises a buffer cavity 15, the buffer cavity 15 is connected between the branch 13 and the air exhaust pipe 41, and all the branches 13 in the adjustable shifting oxygen enrichment assembly are connected to the same buffer cavity 15. That is to say, in the same adjustable shifting oxygen enrichment assembly, all the gases collected by the collection cavities 12 will first enter the buffer cavity 15 through the branches 13. It can be understood that the buffer cavity 15 can stabilize the air pressure in the air pressure system. When at least two branches 13 in the adjustable shifting oxygen enrichment assembly are opened, the buffer cavity 15 can make the negative pressure obtained by the corresponding at least two collection cavities 12 more balanced, which is beneficial to improve the overall oxygen absorption capacity.

[0059] Specifically, the shifting part 14 is arranged at the connection between the branch 13 and the buffer cavity 15. The space here is relatively large, on the one hand, it is convenient for the assembly of the shifting part 14, and the buffer cavity 15 provides the activity space of the shifting part 14.

[0060] In some embodiments, in the adjustable shifting oxygen enrichment assembly, all the oxygen enrichment membranes 11 are located on the same plane, all the collection cavities 12 are arranged on the same side of the oxygen enrichment membrane 11, and each adjacent two collection cavities 12 are spaced apart by the partition plate 16. In this way, the collection cavities 12 are relatively concentrated in position, occupy small space, and the whole is in the form of a plate, which is convenient for positioning and installation.

[0061] Specifically, in the adjustable shifting oxygen enrichment assembly, all the oxygen enrichment membranes 11 are integral membranes, and the partition plate 16 abuts against the oxygen enrichment membrane 11. A single adjustable shifting oxygen enrichment assembly only needs to assemble a single oxygen enrichment membrane 11, and the assembly and positioning difficulty is reduced.

[0062] Further, as shown in Figure 2 The sealing strip 17 is arranged between the partition plate 16 and the oxygen enrichment membrane 11. The sealing strip 17 can play a sealing role, so that the gases in different collection cavities 12 do not intermix. The sealing strip 17 can also make the working collection cavity 12 maintain a relatively strong negative pressure, thereby improving the gas absorption capacity. In addition, the sealing strip 17 can also serve as a protective part of the oxygen enrichment membrane 11, thereby reducing the probability of the partition plate 16 splitting the oxygen enrichment membrane 11 in vibration.

[0063] Optionally, as shown in Figure 2As shown, the adjustable profile oxygen enrichment assembly includes at least two hoses 18, the lumens of which constitute the branch channels 13, and one end of each of the hoses 18 is connected to the side wall of the collection chamber 12. In this way, the oxygen enrichment assembly 1 maintains an overall flat state at the oxygen enrichment membrane 11 and the collection chamber 12, and can be arranged on the side wall of the fresh-keeping chamber 210. At this time, the connection between the hoses 18 and the collection chamber 12 is also arranged along the side wall of the fresh-keeping chamber 210, and can be protected by the side wall of the fresh-keeping chamber 210.

[0064] In some embodiments, as shown, the fresh-keeping device 100 further includes a turbulence fan 7 arranged in at least one fresh-keeping chamber 210. The turbulence fan 7 can promote uniform gas flow in the fresh-keeping chamber 210, and the oxygen content is relatively uniform and consistent everywhere in the fresh-keeping chamber 210. Moreover, it is beneficial to promote the flow of oxygen through the oxygen enrichment membrane 11 and into the collection chamber 12. Thus, the oxygen collection efficiency is improved. Figure 2

[0065] In some embodiments, the oxygen enrichment membrane is a membrane material that can selectively allow oxygen to pass through, thereby enriching oxygen on one side of the membrane.

[0066] The basic structural hierarchy includes a surface layer, an active separation layer, and a support layer. The surface layer is the outermost part of the oxygen enrichment membrane 11 that contacts the gas in the fresh-keeping 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 enrichment membranes 11 is composed of high-molecular materials with oxygenophilic groups that can preferentially adsorb oxygen molecules.

[0067] The surface layer is very thin, generally on the order of nanometers to microns. This is to reduce the path length of gas molecule diffusion, so that oxygen molecules can quickly enter the interior of the membrane for subsequent separation processes.

[0068] The active separation layer is the core structural part of the oxygen enrichment membrane 11. It is composed of polymer materials with special molecular structures, and there are certain gaps and channels between the molecular chains of these polymers. Its molecular structure can selectively allow oxygen molecules to pass through according to the differences in size, shape, polarity, and other physical and chemical properties of oxygen and other gas (such as nitrogen) molecules. For example, the diameter of oxygen molecules is relatively small, and under certain pressure driving, oxygen molecules can pass through the small channels in the active separation layer, while nitrogen molecules with larger diameters are blocked. The active separation layer is also very thin, generally on the order of a few hundred nanometers, which can ensure a high oxygen permeation flux.

[0069] Located below the active separation layer, the main function is to provide mechanical support for the active separation layer. Since the active separation layer is very thin and fragile, the support layer can prevent it from being damaged by external forces such as pressure and stretching during use.

[0070] ​The support layer is usually made of porous high-molecular material or inorganic material, which has high strength and stability. The pore structure thereof can allow gas to pass through smoothly in the vertical direction without causing great resistance to the permeation of oxygen. The thickness of the support layer is relatively thick, generally between tens of microns and hundreds of microns.

[0071] According to the refrigerator 1000 of the embodiment of the present application, referring to Figure 1 , comprising a cabinet 200, at least two independent fresh-keeping chambers 210 are arranged in the cabinet 200. The refrigerator 1000 further comprises the fresh-keeping device 100 for the refrigerator 1000, and at least two oxygen-enriching assemblies 1 are arranged corresponding to the at least two fresh-keeping chambers 210.

[0072] In this way, one air extraction device 3 is correspondingly connected to the at least two oxygen-enriching assemblies 1, and the scheme of efficiently reducing oxygen in multiple fresh-keeping chambers 210 by a single air extraction device 3 can be realized. The number of air extraction devices 3 is reduced, and the cost is reduced.

[0073] In some embodiments of the present application, each oxygen-enriching assembly 1 can be in a flat plate type and can be horizontally arranged on the top of the fresh-keeping chamber 210.

[0074] In some embodiments, the refrigerator 1000 has a compressor compartment for placing a compressor. The compressor is the core component of the refrigeration system of the refrigerator, which is equivalent to the "heart" of the refrigerator. It raises the pressure and temperature of the refrigerant gas by compression. The compressor compartment is located at the bottom of the refrigerator 1000, and the air extraction device 3 is also arranged here, so that the vibration source is concentrated at the bottom and is eliminated by conduction to the ground.

[0075] According to other structures of the refrigerator 1000 of the present application, such as the compressor, they are all prior art, and will not be described here.

[0076] In the description of the present application, the description of the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fresh-keeping device for a refrigerator, characterized by comprising: The refrigerator has at least two independent fresh-keeping chambers, and the fresh-keeping device comprises: at least two oxygen-enriching assemblies, at least two of the oxygen-enriching assemblies are arranged corresponding to at least two of the fresh-keeping chambers, each of the oxygen-enriching assemblies comprises an oxygen-enriching membrane and a collecting cavity, and the oxygen-enriching assembly is used for making oxygen in the fresh-keeping chamber more permeate through the oxygen-enriching membrane and enter the collecting cavity than nitrogen; an air extraction device, an air extraction pipe is connected between an air inlet end of the air extraction device and the collecting cavity of each of the oxygen-enriching assemblies, so as to suck the gas in the collecting cavity into the air extraction device; wherein at least one of the oxygen-enriching assemblies is an adjustable oxygen-enriching assembly, the oxygen-enriching membrane in the adjustable oxygen-enriching assembly is at least two, each of the oxygen-enriching membranes is provided with a corresponding collecting cavity, and the adjustable oxygen-enriching assembly further comprises: a plurality of branches and an adjusting component, the plurality of branches are at least two and are arranged corresponding to at least two of the collecting cavities, one end of each of the branches is connected to the collecting cavity and the other end is connected to the air extraction pipe, and the adjusting component is used for controlling the opening and closing of the branches and the number of the branches.

2. The freshness keeping device for a refrigerator according to claim 1, characterized by In the adjustable oxygen-enriching assembly, the adjusting component comprises at least two sub-switches, the sub-switches are arranged one by one corresponding to the branches, and each of the sub-switches independently controls the opening and closing of the branches.

3. The freshness keeping device for a refrigerator according to claim 1, characterized by The adjustable oxygen-enriching assembly further comprises: a buffer cavity, the buffer cavity is connected between the branches and the air extraction pipe, and all of the branches in the adjustable oxygen-enriching assembly are connected to the same buffer cavity.

4. The freshness keeping apparatus for a refrigerator according to claim 3, characterized by The adjusting component is arranged at the connection between the branches and the buffer cavity.

5. The freshness keeping device for a refrigerator according to claim 1, characterized by In the adjustable oxygen-enriching assembly, all of the oxygen-enriching membranes are located on the same plane, all of the collecting cavities are arranged on the same side of the oxygen-enriching membranes, and each of adjacent two of the collecting cavities is spaced apart by a partition plate.

6. The freshness keeping apparatus for a refrigerator according to claim 5, characterized by In the adjustable oxygen-enriching assembly, all of the oxygen-enriching membranes are integral membranes, and the partition plates abut against the oxygen-enriching membranes.

7. The freshness keeping apparatus for a refrigerator according to claim 6, characterized by A sealing strip is arranged between the partition plates and the oxygen-enriching membranes.

8. The freshness keeping apparatus for a refrigerator according to claim 5, characterized by The adjustable oxygen-enriching assembly comprises at least two hoses, the lumen of the hose constitutes the branch, and one end of each of the hoses is connected to the side wall of the collecting cavity.

9. The freshness keeping apparatus for a refrigerator according to any one of claims 1-8, characterized in that, Further comprising: a turbulence fan, the turbulence fan is arranged in at least one of the fresh-keeping chambers.

10. A refrigerator comprising a cabinet, characterized by The box body is provided with at least two independent fresh-keeping chambers; The refrigerator further comprises the fresh-keeping device for a refrigerator according to any one of claims 1-9, and at least two of the oxygen-enriching assemblies are arranged corresponding to at least two of the fresh-keeping chambers.

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