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, the at least two oxygen-enriched assemblies are used for being arranged corresponding to the at least two fresh-keeping chambers, and each oxygen-enriched assembly comprises at least one oxygen-enriched membrane and a collecting cavity; the oxygen-enriched assembly is used for enabling more oxygen in the fresh-keeping chamber to penetrate through an oxygen-enriched membrane and enter the collecting cavity relative to nitrogen; the air extracting device is provided with an air inlet end, and an air extracting pipe is connected between the air inlet end and the collecting cavity of each oxygen enrichment assembly so as to suck air in the collecting cavity into the air extracting device; and the flow limiting structure is arranged on the at least one exhaust pipe so as to limit the gas flow in the at least one exhaust pipe. According to the fresh-keeping device, the scheme that at least two fresh-keeping chambers are subjected to efficient oxygen reduction through a single air extractor is achieved, and the cost is reduced. And the differential design of the oxygen reduction capability of at least two fresh-keeping chambers can be realized.

Description

Technical Field

[0001] This utility model relates to the field of refrigerators, and in particular to a preservation device for refrigerators and 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 existing technologies.

[0004] Moreover, different types of food require different oxygen concentrations, and how to design differentiated oxygen concentrations is also one of the research directions. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a preservation device and refrigerator for refrigerators, which can achieve preservation solutions for each compartment through a simple structure and low cost.

[0006] According to an embodiment of the present invention, a preservation device for a refrigerator is provided, wherein the refrigerator has at least two independent preservation compartments, and the preservation device includes: at least two oxygen-enriching components, wherein the at least two oxygen-enriching components are configured to correspond to the at least two preservation compartments, each oxygen-enriching component includes at least one oxygen-enriching membrane and a collection chamber, wherein the oxygen-enriching components are configured to allow more oxygen in the preservation compartment to permeate through the oxygen-enriching membrane and enter the collection chamber than nitrogen; and an air extraction device, wherein the air extraction device has an air inlet end, and an air extraction pipe is connected between the air inlet end and the collection chamber of each oxygen-enriching component to draw gas in the collection chamber into the air extraction device.

[0007] Wherein, at least two of the oxygen-enriching components have unequal flow areas in the oxygen-enriching membrane, and / or, at least two of the exhaust pipes have unequal flow areas.

[0008] This invention relates to a refrigerator preservation device, which uses a single air extraction device connected to at least two oxygen-enriching components. This allows for efficient oxygen reduction in at least two preservation compartments using a single air extraction device. The reduced number of air extraction devices lowers costs. By unequal flow areas at the oxygen-enriching membrane and / or at the air extraction pipe of the at least two oxygen-enriching components, the amount of oxygen ultimately extracted by the two components can be unequal. This allows the at least two preservation compartments to have different oxygen reduction capabilities to accommodate the oxygen concentration requirements of different types of food.

[0009] In some embodiments, the preservation device further includes a flow-limiting structure disposed on at least one of the extraction pipes to limit the gas flow rate within at least one of the extraction pipes.

[0010] Furthermore, the use of a flow-limiting structure restricts the amount of oxygen extracted from the fresh-keeping compartment by limiting the flow rate of the extraction pipe, thus helping to maintain the oxygen content within a set fluctuation range. Compared to directly controlling the operation of the extraction device to control oxygen content, the flow-limiting structure is simpler and places lower demands on the extraction device's structure, thereby further reducing the cost of the fresh-keeping device and extending its service life. Different selections of the flow-limiting structure for different extraction pipes also allow for differentiated oxygen content settings in at least two fresh-keeping compartments.

[0011] In some embodiments, each of the oxygen-enriching components is provided with a flow-limiting structure on the exhaust pipe connected to it, and the gas flow rates through at least two of the flow-limiting structures are unequal.

[0012] In some embodiments, the flow-limiting structure includes a flow-limiting ring, which is disposed inside the extraction pipe, and the flow-limiting ring is provided with a vent hole for gas flow.

[0013] Specifically, the flow-limiting ring is interference-fitted inside the extraction pipe.

[0014] Furthermore, at least two of the oxygen-enriching components are connected to each other in the exhaust pipe, and the air vents on the at least two air vents have different vent areas.

[0015] In some embodiments, the flow-limiting structure includes a constricted section formed on the extraction pipe, the flow area of ​​the constricted section being smaller than the flow area of ​​the extraction pipe.

[0016] Specifically, the constricted tube section is integrally formed on the extraction tube.

[0017] In some embodiments, the flow-limiting structure is disposed adjacent to the air extraction device, and the flow-limiting structure is detachably disposed on the air extraction pipe.

[0018] In some embodiments, the oxygen-enriching membranes of at least two of the oxygen-enriching components have unequal areas.

[0019] In some embodiments, the preservation device further includes a turbulence fan, the turbulence fan being disposed in at least one of the preservation chambers.

[0020] 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.

[0021] 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

[0022] 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:

[0023] Figure 1 This is a schematic diagram of the structure of a refrigerator according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram illustrating the assembly relationship between the preservation device and the preservation chamber in some embodiments;

[0025] Figure 3 This is a diagram showing the location of the flow-limiting structure on the exhaust pipe in some other embodiments of the preservation device.

[0026] Figure label:

[0027] Refrigerator 1000

[0028] 100 preservation devices

[0029] Oxygen-enriched component 1

[0030] 11. Oxygen-enriched membrane; 12. Collection chamber.

[0031] 3. Air extraction device; 31. Air extraction pump; 41. Air extraction pipe; 42. Air inlet pipe.

[0032] Flow limiting structure 5, flow limiting ring 51, vent 511, necked section 52

[0033] Fan 7

[0034] Container size 200, fresh food compartment size 210. Detailed Implementation

[0035] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, 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 the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0038] The following is for reference. Figures 1-3 This invention describes a food preservation device 100 and a refrigerator 1000 for a refrigerator according to embodiments of the present invention.

[0039] 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.

[0040] 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 oxygen in the preservation chamber 210 to permeate through the oxygen-enriching membrane 11 and enter the collection chamber 12 in greater quantities than 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, thereby reducing the intensity of aerobic respiration while ensuring basic respiration, and reducing anaerobic respiration, thus promoting long-term preservation of fruits and vegetables.

[0041] Reference Figure 2 The preservation device 100 also includes an air extraction device 3, which has an air inlet end and an air extraction pipe 41 connected between the air inlet end 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.

[0042] 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.

[0043] 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.

[0044] 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, enabling a single air extraction device 3 to efficiently reduce oxygen levels in multiple preservation compartments 210. The reduced number of air extraction devices 3 lowers costs.

[0045] 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.

[0046] 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.

[0047] To achieve differentiated oxygen concentration design in the preservation compartment 210, in this application, at least two oxygen-enriching components 1 have unequal flow areas in the oxygen-enriching membrane 11, or at least two exhaust pipes 41 have unequal flow areas. Alternatively, at least two oxygen-enriching components 1 may have unequal flow areas not only in the oxygen-enriching membrane 11, but also in the exhaust pipes 41.

[0048] 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.

[0049] Therefore, in this application, by setting at least two oxygen-enriching components 1 with unequal flow areas on the oxygen-enriching membrane 11, the number of oxygen molecules passing through the at least two oxygen-enriching membranes 11 per unit time can be unequal. By limiting the unequal flow areas of the at least two oxygen-enriching components 1 on the extraction pipe 41, the negative pressure applied to the at least two oxygen-enriching membranes 11 during the operation of the extraction device 3 is unequal, thereby resulting in unequal amounts of gas molecules passing through.

[0050] This design allows at least two preservation compartments 210 to have different oxygen reduction capabilities, achieving differentiated oxygen concentration design, which is beneficial for preserving food with different oxygen concentration requirements.

[0051] In some embodiments, limiting the flow areas of at least two oxygen-enriching components 1 on the oxygen-enriching membrane 11 to be unequal mainly involves setting the areas of the oxygen-enriching membrane 11 of the at least two oxygen-enriching components 1 to be unequal. This limitation is simple and can save on the cost of the oxygen-enriching membrane 11 of oxygen-enriching components 1 with low oxygen reduction requirements.

[0052] In some embodiments, refer to Figure 2 and Figure 3 To limit the unequal flow areas of at least two oxygen-enriching components 1 in the extraction pipe 41, a flow-limiting structure 5 can be provided. The flow-limiting structure 5 is provided on at least one extraction pipe 41 to limit the gas flow rate within at least one extraction pipe 41.

[0053] Furthermore, by employing a flow-limiting structure 5, the amount of oxygen extracted from the preservation compartment 210 is limited by restricting the flow rate of the extraction pipe 41, thus helping to maintain the oxygen content in the preservation compartment 210 within a set fluctuation range. Compared to the scheme of directly controlling the operation of the extraction device 3 to control the oxygen content, the flow-limiting structure 5 is simpler to control the oxygen content, and it reduces the structural requirements of the extraction device 3, thereby further reducing the cost of the preservation device 100 and also helping to extend the service life of the extraction device 3.

[0054] Furthermore, the different selections of the flow-limiting structure 5 for different exhaust pipes 41 also facilitate the differentiated setting of oxygen content in multiple preservation compartments 210. For example, some exhaust pipes 41 may not have the flow-limiting structure 5, while others may have it. This results in a decrease in the exhaust volume of the exhaust pipes 41 with the flow-limiting structure 5, leading to a relative increase in the oxygen content of the corresponding preservation compartment 210. Consequently, different preservation compartments 210 can achieve different oxygen contents.

[0055] In some embodiments, each oxygen-enriching component 1 is connected to an exhaust pipe 41 with a flow-limiting structure 5, and the gas flow rates through at least two flow-limiting structures 5 are unequal. This configuration allows for differentiated oxygen content designs within different preservation compartments 210. Compared to other solutions, this method for creating differentiated oxygen content also occupies a smaller volume.

[0056] In some embodiments, such as Figure 2 As shown, the flow-limiting structure 5 includes a flow-limiting ring 51, which is installed inside the extraction pipe 41. The flow-limiting ring 51 has a vent hole 511 for gas flow. The flow-limiting ring 51 has a simple structure, low cost, and is easy to assemble. Moreover, it can be mass-produced with a low scrap rate.

[0057] Specifically, the flow-limiting ring 51 is interference-fitted inside the suction pipe 41. This arrangement securely holds the flow-limiting ring 51 within the suction pipe 41, preventing it from tilting and failing to limit flow during impacts. Furthermore, the interference fit reduces assembly costs and eliminates the need for excessive drilling in the suction pipe 41, thus maintaining its airtightness.

[0058] Furthermore, at least two oxygen-enriching components 1 are connected by an exhaust pipe 41 with a flow-limiting ring 51 inside, and the vent holes 511 on the at least two flow-limiting rings 51 have unequal areas. That is, the vent holes 511 on the at least two flow-limiting rings 51 are of different sizes. This method of achieving different oxygen contents in different preservation compartments 210 has an extremely simple structure and low cost. Moreover, when replacement is needed, the oxygen content of the preservation compartment 210 can be changed by replacing the flow-limiting ring 51, resulting in low replacement costs.

[0059] In some embodiments, refer to Figure 3 The flow-limiting structure 5 includes a necked section 52 formed on the extraction pipe 41, the flow area of ​​which is smaller than that of the extraction pipe 41. In other words, a section of the extraction pipe 41 has a reduced diameter, thus reducing the gas flow rate. This further reduces assembly difficulty.

[0060] Optionally, the necked section 52 is integrally formed on the extraction pipe 41, which facilitates sealing. During processing, the diameter of a section of the extraction pipe 41 can be reduced by thermoforming to form the necked section 52. Of course, the present application is not limited to this; the necked section 52 can also be inserted into the extraction pipe 41.

[0061] In some embodiments, such as Figure 2 As shown, the flow-limiting structure 5 is positioned adjacent to the suction device 3, and is detachably mounted on the suction pipe 41. This arrangement facilitates the detection of blockages in the flow-limiting structure 5. In particular, both the flow-limiting structure 5 and the suction device 3 can be placed in easily accessible locations within the refrigerator 1000 for convenient replacement. For example, both the flow-limiting structure 5 and the suction device 3 can be located within the compressor compartment of the refrigerator 1000.

[0062] Specifically, such as Figure 2 As shown, multiple suction pipes 41 are connected to the suction device 3 via air inlet pipes 42, and the suction pipes 41 and air inlet pipes 42 constitute a multi-port pipe. For example, in Figure 2 In the middle, the exhaust pipe 41 and the intake pipe 42 are three-way pipes.

[0063] In some embodiments, the preservation device 100 further includes a turbulence fan 7, which is disposed within at least one preservation chamber 210. The turbulence fan 7 can promote uniform gas flow within 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] According to the refrigerator 1000 of this utility model embodiment, referring to... Figure 1The 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.

[0071] 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.

[0072] In some embodiments of this utility model, each oxygen-enriching component 1 may be flat and may be horizontally disposed on the top of the preservation chamber 210.

[0073] 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.

[0074] Other structures of the refrigerator 1000 according to this utility model, such as the compressor, are all existing technologies and will not be described in detail here.

[0075] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the 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.

[0076] Although embodiments of the present 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 present invention, the scope of which 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 the at least two fresh-keeping chambers, each of the oxygen-enriching assemblies comprises at least one oxygen-enriching membrane and a collecting cavity, and the oxygen-enriching assemblies are used for making oxygen in the fresh-keeping chambers more permeate through the oxygen-enriching membranes and enter the collecting cavities than nitrogen; an air extraction device, the air extraction device has an air inlet end, and an air extraction pipe is connected between the air inlet end and the collecting cavity of each of the oxygen-enriching assemblies to suck the gas in the collecting cavities into the air extraction device; wherein the flow areas of the oxygen-enriching membranes of the at least two oxygen-enriching assemblies are different, and / or the flow areas of the at least two air extraction pipes are different.

2. The freshness keeping device for a refrigerator according to claim 1, characterized by Further comprising: a flow-limiting structure, the flow-limiting structure is arranged on at least one of the air extraction pipes to limit the gas flow in the at least one air extraction pipe.

3. The freshness keeping apparatus for a refrigerator according to claim 2, characterized by The flow-limiting structure comprises a flow-limiting ring, the flow-limiting ring is arranged in the air extraction pipe, and the flow-limiting ring is provided with a gas passage hole for gas flow.

4. The freshness keeping apparatus for a refrigerator according to claim 3, characterized by The flow-limiting ring is interference-fitted in the air extraction pipe.

5. The freshness keeping apparatus for a refrigerator according to claim 3, characterized by The flow-limiting rings arranged in the air extraction pipes connected with the at least two oxygen-enriching assemblies are different in hole area of the gas passage holes.

6. The freshness keeping apparatus for a refrigerator according to claim 2, characterized by The flow-limiting structure comprises a necked pipe section formed on the air extraction pipe, and the flow area of the necked pipe section is smaller than that of the air extraction pipe.

7. The freshness keeping apparatus for a refrigerator according to claim 6, characterized by The necked pipe section is integrally formed on the air extraction pipe.

8. The freshness keeping apparatus for a refrigerator according to any one of claims 2 to 6, characterized by The flow-limiting structure is arranged close to the air extraction device, and the flow-limiting structure is detachably arranged on the air extraction pipe.

9. The freshness keeping apparatus for a refrigerator according to any one of claims 1-7, characterized in that, The oxygen-enriching membranes of the at least two oxygen-enriching assemblies are different in area.

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

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